In the fast-paced food and beverage processing industry, the demand for material handling equipment that offers both stability and high efficiency is paramount. UUPAC's High Stability Inclined Belt Conveyor is engineered to meet these exacting standards, providing a reliable and efficient solution for a wide range of applications.

• Unmatched Material Quality for Consistent Performance

    The conveyor belt of UUPAC's inclined belt conveyor is crafted from food-grade polypropylene (PP) material. This choice of material is not only compliant with strict food safety regulations but also brings multiple advantages that contribute to high-efficiency performance. With the ability to freely adjust the belt length and width, it can be customized to fit various production line layouts, eliminating the need for complex reconfigurations. The belt's aesthetic appeal, coupled with its excellent resistance to deformation, ensures it maintains a professional look while withstanding the rigors of continuous operation. Its high and low-temperature resistance further enables seamless operation in diverse processing environments, whether it's the chilled storage areas for cold - processed foods or the high-heat zones in baking facilities. This durability reduces downtime due to belt replacement, keeping your production line running smoothly and efficiently.

• Versatility and Adaptability for Diverse Applications

    UUPAC's inclined belt conveyor stands out for its wide range of applications and long service life. The variety of patterns available on the belt surface, along with the option of sidewalls and skirts, allows for the secure transportation of different types of food and beverage products. Whether you're handling delicate pastries, heavy canned goods, or flowing liquids, there's a configuration that can be tailored to your specific needs. This adaptability minimizes the requirement for multiple conveyors, streamlining your production process and saving valuable space. The long - lasting nature of the conveyor also means lower overall costs over time, as you won't need to invest in frequent replacements, enhancing the efficiency of your operations from a financial perspective as well.

• Seamless Integration for Automated Production

    One of the key features that boosts the efficiency of UUPAC's inclined belt conveyor is its ability to combine with other equipment to form a complete production line for continuous or intermittent automatic weighing and packaging. In the food and beverage industry, where precision and speed are crucial, this seamless integration ensures a smooth flow of products from one process to the next. For example, it can be connected to automated weighing machines that accurately measure the quantity of ingredients or finished products, followed by packaging units that seal and label items with precision. This eliminates the need for manual intervention at multiple stages, reducing the risk of human error and significantly increasing production speed. The result is a highly efficient production line that can handle large volumes of products with ease, meeting the demands of modern food and beverage processing.

• User-Friendly Design for Easy Operation and Maintenance

     The variable frequency drive (VFD) feature of UUPAC's inclined belt conveyor allows for easy adjustment of the conveying speed, providing flexibility to match the pace of different production processes. Whether you need to slow down for delicate handling or speed up for high-volume production, the VFD gives you precise control. 

    Additionally, the conveyor's design enables easy disassembly, making maintenance and cleaning a breeze. In the food and beverage industry, where hygiene is of utmost importance, quick and efficient cleaning is essential to prevent cross-contamination and ensure product safety. With UUPAC's conveyor, you can minimize downtime for cleaning and maintenance, getting your production line back up and running in no time, thereby maintaining high levels of operational efficiency.

    In conclusion, UUPAC's High Stability Inclined Belt Conveyor is a comprehensive solution that delivers high-efficiency performance in the food and beverage processing industry. Its combination of high-quality materials, versatility, seamless integration capabilities, specialized solutions, and user-friendly design makes it an ideal choice for businesses looking to optimize their production processes. If you're seeking a reliable and efficient conveyor system that can enhance your productivity and reduce costs, contact UUPAC today to learn more about how our inclined belt conveyor can meet your specific needs.

Improvement of shoemaking process: The use of hot melt glue machine makes the shoemaking process more efficient, precise and cost-saving. By using hot melt glue machine in the shoemaking process, the soles, uppers and other shoe parts can be glued, which improves the efficiency of shoemaking and reduces labor costs.

Quality control and product consistency: Hot melt glue machine ensures that the glue is evenly applied to parts such as soles and uppers, improves the quality control of shoemaking and ensures product consistency. This helps to produce high-quality shoes, enhance brand image and market competitiveness.

Environmental protection and health: Compared with traditional glue methods, the hot melt adhesives used by hot melt glue machines are usually more environmentally friendly, free of volatile hazardous substances, and meet environmental standards, which helps reduce the impact of the production process on the environment. In addition, the operation of hot melt glue machines is relatively clean, reducing the risk of workers being exposed to hazardous substances and protecting the health of employees.

Customization and innovative design: The flexibility and precision of hot melt glue machines enable shoe companies to better achieve customized production and innovative design. Manufacturers can more easily explore new design concepts and production methods to provide customers with personalized customized shoes to meet different needs and markets.

Supply chain efficiency: The use of hot melt glue machines can help shoemaking companies improve supply chain efficiency and reduce production time and production costs. The rapid curing and bonding effect of glue can speed up the production process, shorten the delivery cycle, and improve the competitiveness of enterprises.

In short, the application of hot melt glue machines in the field of shoemaking plays an important role in improving production efficiency, product quality and environmental awareness, and is of great significance to the development of the shoemaking industry.

I. Characteristics and Advantages of Polyacrylate (PAA) Binders

1. Minimal Swelling in Electrolyte Solvents: Exhibits low swelling, maintaining structural integrity of electrode sheets during charge/discharge cycles.
2. High Proportion of Carboxyl Groups: The high density of polar carboxyl groups forms strong hydrogen bonds with hydroxyl-containing active materials, enhancing dispersion stability.
3. Continuous Film Formation: Creates a uniform film on material surfaces, improving contact between active materials and current collectors.
4. Excellent Mechanical Stability: Facilitates ease of processing during electrode manufacturing.
5. Enhanced SEI Formation and Cycling Performance: The high concentration of polar functional groups promotes hydrogen bonding with silicon material surfaces and aids in forming a stable Solid Electrolyte Interphase (SEI) layer, resulting in superior cycle life.

II. Development Challenges

Conventional PAA (Polyacrylic Acid) binder systems for electrodes typically utilize cross-linked PAA polymers as the anode binder. As a high-molecular-weight polymer, PAA offers excellent adhesion, dispersion stability, and corrosion inhibition. It stabilizes the network structure within the anode slurry, ensures uniform dispersion of active materials, and extends electrode sheet lifespan.

• However, the polar functional groups facilitate hydrogen bonding within the long molecular chains of PAA. This restricts free rotation of the chains, increasing their rigidity. Consequently, PAA-based electrode sheets generally exhibit poor toughness. This compromises their ability to withstand stresses induced by the volume expansion of active materials during cycling, hinders cell winding processes, and ultimately limits improvements in battery electrochemical performance.

III. Research Practices in Practical Applications of Battery-Grade PAA

1. Sodium-Ion Battery Hard Carbon Anodes

Manufacturers of hard carbon anodes for Sodium-Ion Batteries (SIBs) impose stringent requirements on PAA binders. A high-quality, highly flexible PAA binder is crucial for protecting the structural integrity of hard carbon anodes.

• In the current SIB hard carbon anode market, using substandard PAA binders significantly increases the risk of elevated internal resistance, negatively impacting battery efficiency and reliability. Conversely, a premium, highly flexible PAA binder effectively mitigates these issues.
• The electrochemical performance, conductivity, environmental adaptability, and corrosion resistance of the flexible PAA binder are also critical factors, directly influencing the quality of the final hard carbon anode product.
• Beyond inherent characteristics, practical application focuses heavily on performance parameters such as binder characteristics, solid content, adhesion strength, and pH level. These parameters directly correlate with the operational efficiency of the hard carbon anode.

2. Silicon-Based Anodes

Silicon-based lithium-ion battery anodes offer a specific capacity an order of magnitude higher than conventional graphite. However, forming stable silicon anodes is challenging due to significant volume changes during the electrochemical alloying/dealloying of silicon with lithium. Binder selection and optimization are vital for improving silicon anode stability. Most research utilizes Carboxymethyl Cellulose (CMC) and Polyvinylidene Fluoride (PVDF) binders.

• A significant body of experimental research indicates that pure PAA possesses mechanical properties comparable to CMC but contains a higher concentration of carboxyl functional groups. This enables PAA to act as a binder for Si anodes, delivering superior performance.
• Research further demonstrates the positive impact of carbon coating on anode stability. Carbon-coated Si nanopowder anodes (tested between 0.01 and 1 V vs. Li/Li+), incorporating PAA at levels as low as 15 wt%, exhibit exceptional stability over the first 100 cycles. These findings open new avenues for exploring novel binders like the Polyvinyl Alcohol (PVA) series.
• Crosslinking PAA with other materials represents a new development direction, including AA-CMC cross-linked binders, PAA-PVA cross-linked binders, PAA-PANI (Polyaniline) cross-linked binders, and EDTA-PAA binders.

3. PVA-g-PAA (PVA-grafted-PAA)

A novel water-soluble binder, PVA-g-PAA, is synthesized by grafting PAA onto the side chains of highly flexible PVA (Polyvinyl Alcohol). This functional group modification enhances the flexibility of the PAA binder system while leveraging PVA's excellent adhesion properties.

• This free-radical grafting polymerization introduces elasticity, compensating for the structural limitations of pure PAA binders.
• During electrode sheet fabrication, rolling compaction is performed continuously using varying roller pressures across defined length segments of the sheet. This process enhances sheet toughness, minimizing deformation, increasing electrode specific capacity, improving rate capability, and extending battery cycle life.

4. PAA Prelithiation (LiPAA)

The application of silicon-carbon (Si-C) materials imposes higher demands on anode binder and conductive agent systems. Traditional rigid PVDF binders are unsuitable for Si anodes. Acrylic PAA binders contain numerous carboxyl groups capable of forming hydrogen bonds with functional groups on Si surfaces, promoting SEI formation and significantly improving the cycle life of Si anodes. Thus, PAA binders are highly effective for Si anodes.

• Studies indicate that Lithium Polyacrylate (LiPAA) outperforms PAA itself, although the underlying reasons were unclear. Extensive research has been conducted to elucidate the mechanism behind LiPAA's superior performance.
• Electrodes composed of 15% nano-Si, 73% artificial graphite, 2% carbon black, and 10% binder (either PAA or LiPAA) were studied. After initial drying, a secondary drying step at 100-200°C was performed to remove residual moisture completely. Coin cell testing revealed capacities of ~790 mAh/g for LiPAA-based anodes versus ~610 mAh/g for PAA-based anodes.

Cycle performance curves of full cells using NMC532 cathodes

• Figure A: Cells with LiPAA binder show no significant correlation between cycle performance and secondary drying temperature. The NMC532 cathode delivered an initial capacity of 127 mAh/g at C/3, declining to ~91 mAh/g after 90 cycles.
• Figure B: Cells with PAA binder exhibit a clear dependence on secondary drying temperature (120°C red, 140°C gold, 160°C green, 180°C blue). While the 160°C dried PAA cell showed the highest initial capacity and the 120°C dried cell the lowest, the 160°C dried cell degraded fastest, reaching ~62 mAh/g after 90 cycles. The 140°C dried cell degraded slower, maintaining ~71 mAh/g.
• First-cycle Coulombic Efficiency (CE): LiPAA cells achieved ~84% (only the 200°C LiPAA cell was slightly lower at ~82%). Their Coulombic efficiency rapidly increased to ~99.6% within the first 5 cycles. PAA cells achieved ~80% first-cycle CE (only the 180°C PAA cell was significantly lower at ~75%), requiring ~40 cycles to reach 99.6% CE – markedly slower than LiPAA cells.
• Pulse discharge tests at 50% Depth of Discharge (DOD) revealed significantly lower internal resistance in LiPAA cells compared to PAA cells [Referenced Figure Below], with no apparent link to secondary drying temperature for LiPAA. In contrast, PAA cell resistance increased noticeably with higher secondary drying temperatures.

• Thermogravimetric Analysis (TGA) by Kevin A. Hays [Referenced Figure Below] on LiPAA and PAA anodes identified two main dehydration steps: 1) Free water removal (~40°C), 2) Adsorbed water removal (LiPAA ~75°C, PAA ~125°C). Additional weight loss peaks occurred for PAA between 140-208°C and LiPAA between 85-190°C, attributed to polymerization of some carboxyl groups releasing water [Referenced Reaction Below]. This reaction is less pronounced in LiPAA, where Li replaces H in ~80% of carboxyl groups.

• High-temperature polymerization of PAA carboxyl groups may weaken the interaction between PAA and Si, potentially explaining the poor cycle performance of high-temperature dried PAA anodes. However, peel strength tests showed that while PAA adhesion decreased with higher drying temperatures, it remained higher than LiPAA overall, suggesting other factors contribute to LiPAA's superior cycling.

Ⅳ. Conclusion

This study identifies poor electrochemical stability as a key factor limiting PAA's cycle performance. At low potentials, PAA undergoes partial conversion to LiPAA, generating hydrogen gas:

PAA + ... -> LiPAA + H₂

This reaction explains the lower first-cycle CE of PAA cells (~80%) compared to LiPAA cells (~84%), and the significantly longer time (~40 cycles vs. <5 cycles) required for PAA cells to achieve high Coulombic efficiency (99.6%).

TOB NEW ENERGY - Your Professional Partner in Battery Materials, Equipment, and Production Line Solutions.

In lithium-ion battery manufacturing, the fineness of the slurry (mainly referring to the electrode slurry) is a key parameter affecting electrode performance (such as capacity, rate capability, cycle life, safety) and process stability. Different battery types have significantly different fineness requirements for the slurry (usually measured by particle size distribution indicators such as D50, D90, Dmax), due to the intrinsic characteristics of their positive/negative electrode active materials (such as crystal structure, ionic/electronic conductivity, specific surface area, mechanical strength, reactivity) and different requirements for electrode microstructure.

The following is a detailed analysis of slurry fineness requirements for major battery types:

I. Lithium Cobalt Oxide (LCO) Batteries

1. Material Characteristics:

Layered structure (R-3m), high theoretical capacity (~274 mAh/g), high compaction density, but relatively poor structural stability (especially at high voltages), moderate cycle life and thermal stability, high cost.

2. Fineness Requirements):

High fineness is required. Typically requires D50 in the range of 5-8 μm, D90 < 15 μm, maximum particle size Dmax < 20-25 μm.

3. Reasons:

• High rate performance: Finer particles shorten the lithium-ion diffusion path within the particles, facilitating high-rate charging and discharging.
• High compaction density: Fine particles can pack more tightly, increasing the electrode's compaction density and volumetric energy density.
• Reducing side reactions/Improving cycling: Small and uniform particles help form a more uniform solid electrolyte interphase (SEI) film, reducing cracks caused by localized stress concentration in large particles and side reactions with the electrolyte, improving cycle stability (especially at high voltages).
• Reducing polarization: Reducing particle size can lower charge transfer resistance and concentration polarization.

II. Lithium Iron Phosphate (LFP) Batteries

1. Material Characteristics:

Olivine structure (Pnma), extremely stable structure (strong P-O bonds), long cycle life, excellent thermal safety, low cost. However, both electronic conductivity and ionic conductivity are low, compaction density and voltage plateau are low.

2. Fineness Requirements:

Very high fineness is required. Typically requires D50 in the range of 0.2-1.0 μm (200-1000 nm), D90 < 2-3 μm. This is the highest fineness requirement among all mainstream lithium-ion battery cathode materials.

3. Reasons:

• Overcoming intrinsic low conductivity: This is the core reason. LFP's extremely low electronic and ionic conductivity is the main bottleneck for its performance. Nanosizing it (D50<1μm) is a key strategy to improve rate capability, significantly shortening the transport paths of electrons and lithium ions.
• Improving rate performance: Nanoparticles enable high-rate charge/discharge capability.
• Improving tap/compaction density: Although nanoparticles themselves have low tap density, through reasonable particle morphology (such as spheroidization) and slurry/electrode processes, fine primary particles can fill better, improving electrode compaction density (though still lower than LCO/NCM).
• Fully utilizing capacity: Ensures all particles can fully participate in the electrochemical reaction, avoiding unreactive "dead zones" inside large particles.

III. NCM Batteries (LiNiₓCoᵧMn₂O₂)

1. Material Characteristics:

Layered structure (R-3m), combines the high capacity/high voltage of lithium cobalt oxide, the high capacity of lithium nickelate, and the stability/low cost of lithium manganate. Performance (energy density, rate capability, cycle life, safety, cost) depends on the specific ratio (e.g., NCM111, 523, 622, 811). Higher nickel content leads to higher capacity and energy density, but greater challenges in structural stability and safety.

2. Fineness Requirements:

High fineness is required, but specific requirements become stricter with increasing nickel content.

• Medium/Low Nickel (e.g., NCM523 and below): D50 typically 6-10 μm, D90 < 18-22 μm.
• High Nickel (e.g., NCM622, 811, NCA): D50 requires finer particles, typically 3-8 μm (especially 811/NCA tends to be finer), D90 < 12-15 μm, strict control of Dmax < 20 μm.

3. Reasons:

• High energy density/rate performance: Fine particles help increase compaction density and rate performance (shortening Li⁺ diffusion path).
• Improving structural stability of high-nickel materials: High-nickel materials (high reactivity) are more prone to structural degradation (e.g., phase transition, microcracks) during cycling.
• Fine and monodisperse particles can: Reduce stress concentration within particles and crack initiation/propagation.
• Form a more uniform and stable CEI film, reducing electrolyte consumption and transition metal ion dissolution.
• Mitigate particle pulverization during cycling, improving cycle life.
• Reduce interfacial impedance/polarization: Similar to LCO.
• Safety considerations: Finer particles have relatively better heat dissipation and more stable structure, helping to improve safety (especially for high-nickel materials).

IV. NCA Batteries (LiNiₓCoᵧAl₂O₂)

1. Material Characteristics:  Very similar to high-nickel NCM (high capacity, high energy density). Aluminum doping aims to improve structural stability and cycle performance, but processing challenges (e.g., sensitivity to humidity) and safety challenges remain.

2. Fineness Requirements:

Very high fineness is required, close to or equivalent to high-nickel NCM (e.g., 811). D50 typically 3-7 μm, D90 < 12-15 μm, strict control of Dmax.

3. Reasons:

Identical to high-nickel NCM. The core lies in maximizing structural stability, cycle life, and safety through nano-sizing/fine particles while pursuing high energy density.

V. Lithium Titanate (LTO) Batteries)

1. Material Characteristics:

Spinel structure (Fd-3m), used as anode. Has "zero-strain" characteristic (minimal volume change), ultra-long cycle life (over 10,000 cycles), excellent rate capability and low-temperature performance, extremely high safety. However, high operating voltage (~1.55V vs Li+/Li) leads to low full-cell voltage and low energy density.

2. Fineness Requirements:

Medium to fine fineness is required. D50 typically in the range of 1-5 μm, D90 < 10-15 μm. Coarser than LFP, possibly slightly finer or comparable to some NCM/LCO.

3. Reasons:

• High-rate performance: LTO itself has good conductivity, but fine particle size is still an effective means to improve ultra-high-rate performance (e.g., fast charging), shortening the Li⁺ solid-phase diffusion path.
• Increasing compaction density: Although LTO is "zero-strain", increasing compaction density still helps improve volumetric energy density (despite its low absolute value).
• Reducing electrode impedance: Fine particles facilitate the formation of a tighter conductive network.
• Balancing processability and performance: Excessively fine LTO nanoparticles have a huge specific surface area, which significantly increases slurry viscosity, reduces solid content, increases binder/conductive agent usage, and exacerbates side reactions with the electrolyte (although LTO is stable, nano-sizing increases surface activity). Therefore, the fineness requirement is a balance between high-rate performance and processability/cost.

VI. Solid-State Batteries (SSBs)

1. Important Note:

"Solid-state batteries" cover various technical routes (polymer, oxide, sulfide electrolytes), and the choice of positive/negative electrode materials is also diverse (can be any of the above materials or new materials such as lithium-rich manganese-based, lithium metal anode). The requirements for slurry fineness are extremely complex and highly dependent on the specific system, but there are some common trends.

2. Core Challenge:

Solid-solid interfacial contact. In liquid batteries, the electrolyte can wet and fill pores, while the solid electrolyte is rigid particles, and point contact with active materials leads to huge interfacial impedance. This is one of the core challenges of solid-state batteries.

3. Fineness Requirement Trends:

• Generally higher fineness is required: Both active material and solid electrolyte particles usually require finer particle size (D50 often in the sub-micron to micron range).
• Reasons:

(1) Increasing solid-solid contact area: Fine particles provide a larger contact interface, reducing interfacial impedance.

(2) Shortening ion transport path: Fine particles can shorten the Li⁺ transport distance within the active material and solid electrolyte, and at the interface between them.

(3) Achieving more uniform composite: When preparing composite electrodes (active material + solid electrolyte + conductive agent + binder), the particle size and morphology matching of each component is crucial. Usually, all components need to achieve comparable fineness levels to mix uniformly and form effective ionic/electronic conductive networks.

4. Specific System Differences:

• Sulfide solid-state batteries: Highest fineness requirements. Sulfide electrolytes (e.g., LPS) usually need to be made into sub-micron or even nano-sized particles (D50 < 1 μm), active materials also often need to be nano-sized, and extremely uniform mixing (often using high-energy ball milling) is required to form a good ion-percolating network. Maximum particle size control is very strict.
• Oxide solid-state batteries: Electrolytes (e.g., LLZO) are usually hard and have larger particle sizes (micron level). To improve contact, active materials (especially the cathode) also tend to use smaller particles (e.g., D50 1-5 μm), and may require the introduction of a small amount of polymer binder or liquid wetting agent (quasi-solid). High requirements for mixing uniformity.
• Polymer solid-state batteries: The process is relatively close to traditional liquid batteries. Polymer electrolytes have a certain fluidity after heating. The fineness requirements for active materials are similar to or slightly higher than the corresponding liquid systems (e.g., using LFP, NCM), mainly for better interfacial contact and ion transport. The fineness of the polymer electrolyte itself (e.g., PEO particles) also needs to be controlled.
• Anode (e.g., lithium metal, silicon-based): If lithium metal foil is used, there is no slurry fineness requirement. If composite anodes are used (e.g., pre-lithiated silicon/graphite mixed with solid electrolyte), the fineness and mixing uniformity requirements for silicon particles and solid electrolyte particles are extremely high.

VII. Summary and Key Points:

1. Most Stringent Requirements:

Lithium iron phosphate requires the highest fineness (nanoscale) due to its intrinsic low conductivity. High-nickel ternary (NCM811/NCA) and active materials/electrolytes in sulfide solid-state batteries also require very high fineness (sub-micron to microns).

2. High Fineness Requirements:

Lithium cobalt oxide, medium/low-nickel ternary, and active materials in oxide/polymer solid-state batteries usually require high fineness (D50 several microns) to improve energy density, rate performance, and stability.

3. Moderate Fineness Requirements:

Lithium titanate requires medium to fine fineness (D50 1-5 μm), balancing rate performance and processability.

4. Core Driving Factors:

• Overcoming material intrinsic defects: The low conductivity of LFP is the most typical example requiring ultrafine particles.
• Improving kinetic performance (rate capability): Almost all materials need to reduce particle size to shorten ion diffusion paths.
• Increasing energy density (compaction density): Fine particles facilitate tight packing (especially for LCO, NCM).
• Improving structural stability and cycle life: Particularly important for layered materials (LCO, NCM, NCA). Fine particles can reduce stress cracks and side reactions. This is the key reason why high-nickel materials pursue finer particles.
• Optimizing solid-solid interface (solid-state batteries): This is the core requirement distinguishing solid-state batteries from liquid batteries, universally driving the demand for finer particles and more uniform mixing.

5. Trade-off Considerations:

Fineness is not always finer the better. Excessively fine particles can cause:

• Dramatically increased specific surface area -> High slurry viscosity, difficult dispersion, low solid content, increased binder/conductive agent usage -> Increased cost, greater process difficulty, potential reduction in energy density.
• High surface activity -> Aggravated side reactions (consuming electrolyte/lithium source, gas generation), cycle performance may instead decrease (especially for highly reactive materials like high-nickel).
• Severe particle agglomeration -> Affects uniformity and performance

Therefore, the optimal slurry fineness for each battery material is the result of meticulous trade-offs and optimization between its material characteristics, performance targets (energy, power, lifespan, safety), and process feasibility/cost. Manufacturers usually determine the most appropriate fineness control range based on specific material suppliers, formulation design, process equipment, and product positioning.

At TOB NEW ENERGY, we are committed to being your strategic partner in advancing energy storage technologies. We empower next-generation lithium battery production through precision battery mixing systems, electrode preparation systems, battery assembly line, intelligent battery production lines, and high-performance battery materials.  Our offerings extend to cutting-edge battery manufacturing equipment and battery tester, ensuring seamless integration across every stage of battery production. With a focus on quality, sustainability, and collaborative innovation, we deliver solutions that adapt to evolving industry demands. Whether you’re optimizing existing designs or pioneering next-generation batteries, our team is here to support your goals with technical expertise and responsive service. Let’s build the future of energy storage together. Contact us today to explore how our integrated solutions can accelerate your success.

In lithium battery manufacturing, the often-overlooked A/B-side coating misalignment issue during the coating process significantly affects battery capacity, safety, and cycle life. Misalignment refers to inconsistencies in the positional alignment or thickness distribution of coatings on the front and back sides of electrodes, which can lead to risks such as localized lithium plating and mechanical damage to the electrodes.

This article analyzes the root causes of misalignment from perspectives including equipment precision, process parameter settings, and material properties, while proposing targeted optimization strategies to help enterprises enhance product consistency and stability.

Ⅰ. Causes of A/B-Side Misalignment

1. Equipment Factors

Insufficient roll system assembly accuracy: Horizontal or coaxial deviations during the installation of backing rolls and coating rolls may cause positional shifts.

Coating head positioning errors: Low-resolution encoders/grating rulers or sensor feedback drift result in deviations between actual and preset coating positions.

Tension fluctuations: Unstable unwinding/winding tension causes substrate stretching or wrinkling, reducing coating precision.

2. Substrate (Foil) Issues

Non-uniform ductility: Inconsistent foil plasticity complicates gap control during coating.

Poor surface quality: Residual oxide layers weaken slurry adhesion, leading to partial coating or misalignment.

3. Slurry Properties

High viscosity impairing leveling: Poor slurry flowability causes uneven accumulation.

Large surface tension differences: Uneven edge shrinkage due to tension disparities between front/back coatings.

4. Process Settings

Inconsistent coating speeds: Speed differences between sides disrupt slurry spreading.

Drying condition variations: Temperature differences induce uneven thermal shrinkage, causing misalignment.

Ⅱ. Proposed Solutions

1. Equipment Precision Optimization

Regularly inspect roll coaxiality/flatness to control installation errors.

Upgrade coating head positioning components (e.g., high-resolution encoders) to limit deviations within ±0.1 mm.

Implement closed-loop tension control (e.g., PID adjustment) to maintain tension fluctuations below ±3%.

2. Substrate Consistency Control

Select high-uniformity copper/aluminum foils with stable elongation properties.

Adopt advanced surface treatments (e.g., low-temperature plasma cleaning) to enhance slurry adhesion uniformity.

3. Slurry Performance Adjustment

Optimize viscosity (anode: 10–12 Pa·s; cathode: 4–5 Pa·s) for better leveling.

Add surfactants (e.g., PVP, SDS) to balance surface tension between sides.

4. Process Parameter Refinement

Maintain identical coating speeds for both sides (error <0.5 m/min).

Apply segmented temperature control: Low-temperature pre-drying for stress relief and high-temperature curing, with overall temperature differences <5°C.

Ⅲ. Diagnosis and Monitoring Mechanisms

1. Equipment Diagnosis

Use laser interferometers to verify roll parallelism (error <0.02 mm/m).

Inspect motor/sensor signal stability to prevent drift exceeding 0.5% of the range.

2. Substrate Evaluation

Test elongation at break (deviation <±5%).

Analyze surface microstructure/oxide layers via SEM (thickness <50 nm).

3. Slurry Testing

Measure viscosity and thixotropy via rheometers (thixotropic area difference <5%).

Ensure surface tension difference <2 mN/m using tensiometers.

4. On-Line Process Control

Monitor coating thickness with laser sensors (CV <1%).

Post-drying X-ray inspection for coating density uniformity (lateral deviation <2%).

Conclusion

Through precise equipment calibration, material screening, slurry optimization, and systematic process management, A/B-side misalignment can be controlled within ≤0.5 mm. This effectively enhances battery consistency, safety, and cycle life.

At TOB NEW ENERGY, we are committed to being your strategic partner in advancing energy storage technologies. We empower next-generation lithium battery production through precision battery coating systems, intelligent battery production lines, and high-performance materials.  Our offerings extend to cutting-edge battery manufacturing equipment and battery tester, ensuring seamless integration across every stage of battery production. With a focus on quality, sustainability, and collaborative innovation, we deliver solutions that adapt to evolving industry demands. Whether you’re optimizing existing designs or pioneering next-generation batteries, our team is here to support your goals with technical expertise and responsive service.

In industrial production, stable process cooling isn’t just a support function — it’s often the difference between smooth operation and costly downtime. At OUMAL Refrigeration Machinery Co., Ltd, we’ve worked with customers across injection molding, extrusion, thermoforming, and more. Over time, one thing has become clear: choosing the right chiller matters.

Not All Cooling Needs Are Created Equal
Different industries — even different machines — have very different cooling requirements. For example, a customer running a small injection molding line may only need a compact 8 ton chiller to maintain mold temperatures within a tight range. These chillers are space-efficient and offer precise control, making them a practical choice for localized cooling tasks.

On the other hand, when the scale increases or when multiple machines share a cooling circuit, something like a 15 TR chiller tends to be a better fit. We’ve seen these used successfully in mid-sized production lines where reliability and steady performance are non-negotiable.

For large plants, especially those operating around the clock, a 100 ton water cooled chiller can provide both capacity and energy efficiency. Water-cooled systems require more infrastructure — including cooling towers and proper piping — but in return, they offer stable performance in high ambient environments and over long production runs.

Built for Industry, Backed by Experience
What sets OUMAL apart is not just the equipment itself, but the way we build around customer needs. Our manufacturing team can handle a wide range of options and customizations, which means the chiller you receive isn’t off-the-shelf — it’s made to work the way you do.

We’ve served customers in over 20 countries, including the US, Australia, Saudi Arabia, Vietnam, and Brazil. The variety of applications we’ve supported — from blown film to compound mixing — gives us the insight to ask the right questions before making a recommendation. Our goal is always to match cooling performance with process demand, rather than over- or under-sizing.

Long-Term Value Comes from the Right Start
One thing we often remind our partners: a properly selected chiller does more than control temperature. It protects your equipment, shortens your cycle times, and helps maintain product consistency. That’s especially important in processes where a few degrees can mean the difference between a good batch and scrap.

Whether you’re starting with a single machine or upgrading an entire line, OUMAL is ready to help you choose wisely — whether that’s an 8 ton, 15 TR, or 100 ton water cooled chiller.

When someone new joins our engineering team, one of the first questions they usually ask is: “So what’s the difference between air cooled and water cooled chillers—and which one’s better?”

It’s a good question. And after installing, maintaining, and even troubleshooting both systems in dozens of customer factories, here’s how we usually explain it.

Let’s Start with the Basics

An air cooled chiller is essentially a cooling unit that uses ambient air to remove heat from a circulating liquid—usually water or a water-glycol mix. It's often used to keep production equipment or buildings at a stable temperature.

There’s no need for a cooling tower or a complex water pipeline. It uses built-in fans to get the job done.

This setup is widely chosen in:

• Injection molding plants

• Food packaging lines

• Laser processing workshops

• HVAC systems for commercial buildings

If you’ve got space outside and want to avoid dealing with water quality issues, air cooled is probably the better call.

What’s Inside the Unit?

Rather than listing textbook components, here’s what we see under the cover of atypical air cooled water chiller we ship:

• A compressor that acts like the system’s engine

• An evaporator that draws heat out of your process water

• A condenser with aluminum fins, cooled by strong fans

• An expansion valve to adjust refrigerant pressure

• A control panel—the brain of the system

Some models include water pumps and tanks. Others are modular—you can connect them to existing infrastructure.

Here’s How It Works (Simplified)

Let’s say you’re using a CNC machine that heats up during operation. Here’s how the air cooled chiller steps in:

1. The warm water comes back from the CNC.

2. It enters the evaporator inside the chiller.

3. The refrigerant in the evaporator absorbs that heat and turns into a gas.

4. The gas gets compressed—its temperature and pressure rise sharply.

5. That hot gas goes through the condenser. Fans blow outside air across coils, removing the heat.

6. The refrigerant turns back into a liquid, and the cycle repeats.

Your machine keeps running cool—and you don’t need a water tower or much operator attention.

Why Do Customers Choose Air Cooled Units from Us?

Some of our long-term clients choose air cooled chiller systems for one reason: they just work.
Even without an in-house technician, these systems are straightforward to install, easy to control, and rarely break down when used correctly.

Clients also appreciate that we offer:

• Tailored sizing based on actual load

• Remote monitoring options

• Short lead times, even for custom orders

• Reliable after-sales support (yes, even overseas)

As a practical air cooled chiller supplier, we’re not here to sell what’s biggest or most expensive—we help customers find what runs stably for years.

In modern manufacturing, hot melt adhesive is widely used in various industries, including packaging, woodworking, electronics, and automobiles. However, the traditional manual scraping gun method has some inconveniences in large-scale production, such as low production efficiency and high labor costs. In order to overcome these challenges, engineers have developed hot melt adhesive automatic scraping gun technology, providing companies with a tool to improve efficiency and reduce costs.

Limitations of traditional manual scraper guns

In traditional hot melt adhesive applications, workers need to manually bring the hot melt adhesive gun close to the target surface and manually control the spraying and scraping process of the hot melt adhesive. This method has several disadvantages. First, the manual scraper gun needs to be repeatedly positioned and controlled, and the errors caused by this are difficult to avoid, resulting in uneven coating and unstable quality. Second, long-term use of manual scrapers can easily cause worker fatigue and reduce worker work efficiency. In addition, manual scrapers also cause waste of hot melt adhesive because operators often find it difficult to accurately control the amount of hot melt adhesive used.

Advantages of hot melt adhesive automatic scraper

In order to solve the problems of traditional manual scraper, automation technology is gradually applied to the hot melt adhesive field. The hot melt adhesive automatic scraper system consists of a coater, a sensor and a control system. The coater can spray the hot melt adhesive evenly onto the target surface through precise control. At the same time, the sensor can monitor the shape and state of the target surface and automatically adjust the height and speed of the scraper to ensure the consistency and accuracy of the coating. The control system can realize the automated hot melt adhesive scraper process according to the preset parameters and process requirements.

Application fields of hot melt adhesive automatic scraper

Hot melt adhesive automatic scraper technology has been widely used in many industries. In the packaging field, it is used in carton sealing, bag sealing, tape bonding and other links to improve production speed and quality stability. In the woodworking industry, hot melt adhesive automatic scraper can be used in furniture manufacturing, board bonding and other processes to improve production efficiency and product quality. In the electronics industry, automatic scrapers can be used in circuit board assembly, component packaging and other processes to improve work efficiency and reliability. In the automotive manufacturing field, hot melt adhesive automatic scraper can be used in body sealing, interior bonding and other processes to improve bonding effect and product reliability.

The application of hot melt adhesive automatic scraper technology has brought great benefits to all walks of life. It can improve production efficiency, reduce labor costs, ensure the consistency of coating quality, and reduce the waste of hot melt adhesive. With the continuous development of automation technology, hot melt adhesive automatic scraper will be used in a wider range of fields and continue to create greater economic benefits and development opportunities for enterprises.

As an efficient and convenient bonding equipment, hot melt adhesive machine is widely used in packaging, textile, automobile manufacturing and other fields. However, in actual use, hot melt adhesive machine often encounters a thorny problem - carbonization. The generation of carbonization not only affects the normal operation of the equipment, but may also lead to product quality degradation or even equipment damage. Therefore, understanding how to effectively prevent carbonization, the impact of carbonization on use, and the correct treatment method after carbonization is crucial to ensure the stability of the hot melt adhesive machine and extend its service life.

Carbonization is mainly caused by the following factors:

· Too high temperature: Hot melt adhesive needs to melt at a certain temperature, but if the temperature is set too high or the equipment is in a high temperature state for a long time, it will cause the colloid to decompose.

· Too long residence time: The hot melt adhesive stays in the heating system for too long and fails to be discharged in time, which is prone to oxidation and decomposition.

· Air ingress: If the equipment is not well sealed, oxygen in the air enters the adhesive tank or pipe, which will accelerate the oxidation reaction of the colloid.

· Material problem: Some types of hot melt adhesives are sensitive to high temperatures and are more prone to carbonization.

· Equipment aging: Hot melt adhesive machines that have been used for a long time may have problems such as aging of heating elements and failure of temperature control systems, which may lead to abnormal temperature increases.

In order to reduce the occurrence of carbonization of hot melt adhesive machines, the following are some practical preventive measures:

1. Reasonable temperature control

· Set the appropriate heating temperature according to the type of hot melt adhesive used. It is generally recommended to control the temperature at the lower limit of the recommended range to reduce the risk of colloid decomposition.

· Regularly check whether the temperature control system is accurate to avoid abnormal temperature rise due to equipment failure.

2. Shorten the residence time of colloid

· During the production process, minimize the residence time of hot melt adhesive in the heating system. The production process can be optimized to speed up the flow rate of colloid and reduce the time the colloid is exposed to high temperature.

· If the equipment is out of use for a long time, the residual colloid in the glue tank and pipeline should be cleaned in time to avoid carbonization due to long-term standing.

3. Maintain the tightness of the equipment

· Ensure that the hot melt adhesive machine's adhesive tank, pipes, nozzles and other parts are well sealed to prevent air from entering and contacting the adhesive.

· For open-design equipment, consider installing a dust cover or using an inert gas (such as nitrogen) for protection to reduce the occurrence of oxidation reactions.

4. Regularly maintain the equipment

· Regularly check the heating elements, temperature control system and pipe connections of the hot melt adhesive machine to ensure that the equipment is operating normally.

· When cleaning the adhesive tank and pipes, the residual colloid should be thoroughly removed to avoid excessive accumulation and carbonization.

5. Choose high-quality hot melt adhesive

· Different types of hot melt adhesives have different tolerance to high temperatures. It is recommended to choose products with good stability and anti-aging properties.

· When changing the brand or model of hot melt adhesive, be sure to test it first to ensure that it is compatible with the existing equipment.

6. Pay attention to the frequency of adding glue

·During the production process, hot melt glue should be added in an appropriate amount according to actual needs to avoid adding too much glue at one time, which will cause some glue to be carbonized due to long-term non-use.

Once carbonization is found in the hot melt adhesive machine, the following steps should be taken in time to deal with it:

1. Stop the equipment immediately

·When carbonization is detected, the hot melt adhesive machine should be turned off immediately and the heating operation should be stopped to prevent further carbonization.

·Cut off the power supply and wait for the equipment to cool down completely before proceeding with the subsequent operation

2. Clean carbides

· Use special tools or chemical cleaning agents to remove carbides on the adhesive tank, pipes and nozzles.

Common cleaning methods include:

o Mechanical cleaning: Use scrapers, brushes and other tools to manually remove carbides, which is suitable for mild carbonization. o Chemical cleaning: Select a cleaning agent suitable for hot melt adhesive materials (such as professional adhesive remover), inject it into the equipment and soak it for a period of time, and rinse it with clean water after the carbides soften.

o High temperature burning: For stubborn carbides, high temperature burning can be used for cleaning, but it is necessary to control the temperature to avoid damaging equipment components.

3. Check the equipment condition

· After cleaning, carefully check whether there is wear or damage to the glue tank, pipes and nozzles. If necessary, replace damaged parts in time to ensure the normal operation of the equipment.

· Check the performance of the heating elements and temperature control system to ensure that they are working properly.

4. Recalibrate the temperature setting

· Before restarting the equipment, recalibrate the temperature setting to ensure that it meets the requirements for the use of hot melt adhesive.

· Perform a trial run to observe whether the equipment is operating normally and whether the glue flows out evenly.

5. Strengthen daily maintenance

· Analyze the causes of carbonization problems that have occurred and formulate improvement measures to avoid similar situations from happening again.

· Strengthen the daily maintenance of equipment, clean the rubber tank and pipelines regularly, and ensure that the equipment is always in good condition.

The elastic string glue gun is specially developed and designed for the rubber application of sanitary napkins and diaper products. It has the advantages of uniform, delicate and strong covering power. It adopts an air-on-air-off design, which is responsive and reliable. Built-in filter can reduce failures caused by clogged nozzles. Built-in imported high-quality sealed structural components ensure stable operation and long-lasting durability of the gun body. The solenoid valve of the gun body can be powered by DC24V or AC220V according to the user's requirements. Can be modified and applied to other brands of hot melt adhesive equipment according to user requirements.

1. Application of the latest design concepts and balancing technology: Adopting the most advanced design concepts and balancing technology may mean higher work efficiency and a better user experience.

2. Increase the service life of the gun body and reduce maintenance: By improving the design and using high-quality components, the service life of the gun body is increased and maintenance costs are reduced accordingly.

3. Imported core components: The use of imported core components can improve the overall quality and stability of the spray gun, thereby extending its life and improving performance.

4. The number of glue breaks is as high as 3600 times/minute: This shows that the spray gun is fast and reliable in operation and is suitable for mass production needs.

5. Winding glue spraying method: ensure that each rubber band is firmly fixed within 360 degrees, improving product quality and efficiency.

6. High-efficiency and powerful back-extraction module: it can cleanly disconnect the glue, avoid unnecessary impurities or tailing, and ensure production quality.

7. Dual guide function: ensures that each rubber band can be wound accurately, avoiding waste and errors, and improving production efficiency and quality.