Industry Straight Blades for Paper Sheeter Machine Battery Strip Cutting and Bag-Making Machines

In the modern packaging industry, film plastic cross-rotating battery strip cutting and bag-making machines have become core equipment for producing various plastic packaging bags, thanks to their high efficiency and precision. As a crucial component of this equipment, the performance and usage of the blades directly impact product quality and production efficiency. Understanding the key aspects of blade application in practical scenarios is essential for ensuring stable equipment operation and enhancing production benefits.

I. Working Principle of the Blades

The operation of blades in film plastic cross-rotating battery strip cutting and bag-making machines is based on the principle of cross-rotating cutting. During the bag-making process, two sets of blades are arranged at a certain angle, with one set fixed on the equipment's stationary frame and the other mounted on a rotatable cutter disc. As the film plastic strip is conveyed forward by the traction device, the rotating cutter disc drives the blades to rotate at high speed, creating an interlaced cutting action with the fixed blades. This cutting method generates an instantaneous shearing force, quickly and precisely cutting the film, similar to a sharp pair of scissors. As a result, the continuous strip is cut into individual bag blanks of the required size, laying the foundation for subsequent bag-making processes.

II. Installation and Debugging of the Blades

(I) Installation Steps

1. Preparatory Work: Before installing the blades, power off the equipment to ensure operational safety. Prepare specialized installation tools, such as wrenches and screwdrivers, and inspect the blades to confirm that there are no cracks, chips, or other damages on their surfaces.
2. Installation of Fixed Blades: Carefully place the fixed blades on the equipment's stationary frame and secure them with screws. When tightening the screws, follow the diagonal tightening principle to ensure the blades are installed flat and avoid any tilting or wobbling, thus guaranteeing cutting accuracy and stability.
3. Installation of Rotating Blades: Install the rotating blades at the corresponding positions on the cutter disc and fix them with screws. During the installation process, pay attention to the installation direction of the blades, ensuring that the cutting edges face the correct direction and can cooperate effectively with the fixed blades to form a cutting action. After installation, manually rotate the cutter disc to check whether the blades rotate smoothly without any jamming.

(II) Debugging Key Points

1. Adjustment of Blade Clearance: The clearance between the blades is a critical factor affecting cutting quality. If the clearance is too large, the film will be cut unevenly, resulting in rough edges; if it is too small, the blades will wear more rapidly, and there may even be collision damage. Therefore, after installation, use a feeler gauge to precisely measure and adjust the blade clearance. Generally, the blade clearance should be controlled between 0.05 - 0.1mm, and the specific value can be adjusted appropriately according to the thickness and material of the film plastic.
2. Adjustment of Cutting Pressure: The magnitude of the cutting pressure directly affects the cutting effect and the service life of the blades. Excessive pressure will increase the load on the blades and accelerate wear; insufficient pressure may prevent the film from being cut smoothly. Use the pressure adjustment device on the equipment to gradually adjust the cutting pressure. During the debugging process, conduct test cuts with films of different thicknesses and materials, observe the cutting effect, and fine-tune the pressure according to the actual situation until the optimal cutting state is achieved.

III. Applications of Blades in Different Production Scenarios

(I) Ordinary Film Bag-Making

For making bags from ordinary films such as polyethylene (PE) and polypropylene (PP), these films are relatively soft, and the requirement for blade wear resistance is relatively low. In actual production, high-speed steel blades with moderate hardness and sharp cutting edges can be selected. High-speed steel blades have good toughness and cutting performance, enabling them to cut films quickly and neatly. Under normal usage conditions, the service life of these blades is relatively long. During the cutting process, pay attention to controlling the conveying speed of the film, generally recommended to be between 10 - 30 meters per minute, to ensure cutting accuracy and stability. Additionally, regularly check the wear condition of the blades. When the cutting edges of the blades show slight wear, use specialized blade sharpening equipment to sharpen them and restore their sharpness.

(II) Functional Film Bag-Making

With the development of the packaging industry, an increasing number of functional films are applied in bag-making production, such as multi-layer composite films, antistatic films, and high-temperature-resistant films. These film materials usually have special properties and structures, imposing higher requirements on the performance of the blades. Take multi-layer composite films as an example; they are composed of multiple layers of different film materials, are relatively hard, and have a certain degree of toughness. Ordinary high-speed steel blades are often unable to meet the cutting requirements. In this case, carbide blades or ceramic blades can be selected. Carbide blades have high hardness, excellent wear resistance, and good heat resistance, effectively handling the cutting of multi-layer composite films. Ceramic blades, on the other hand, have even higher hardness and wear resistance, and their cutting edges are sharper, enabling more precise cutting, especially suitable for functional film bag-making with high cutting quality requirements. When cutting functional films, in addition to choosing the appropriate blades, it is also necessary to adjust the cutting parameters according to the characteristics of the films, such as appropriately reducing the film conveying speed and increasing the cutting pressure, to ensure the cutting effect.

(III) Battery Strip Cutting and Bag-Making

In the battery production field, film plastic cross-rotating cutting and bag-making machines are mainly used for the encapsulation and bag-making of battery strips. Battery strips are usually composed of metal foils and insulating films, etc., and extremely high precision and quality requirements are imposed on cutting. The cutting quality directly affects the performance and safety of the batteries. In this scenario, the blades not only need to have excellent cutting performance but also high corrosion resistance and wear resistance. Blades with special coatings, such as titanium-coated blades and silicon nitride-coated blades, are generally selected. These coatings can effectively improve the hardness, wear resistance, and corrosion resistance of the blades, extending their service life. At the same time, during the cutting process, strictly control the cutting temperature to avoid changes in the material properties of the battery strips due to excessive temperature. The cooling system of the equipment can be used to cool the blades and maintain the cutting temperature within an appropriate range. Moreover, due to the high dimensional accuracy requirements of battery strips, when installing and debugging the blades, pay more attention to the precise adjustment of the blade clearance and cutting pressure to ensure that the size of the cut bag blanks meets the requirements of battery production.

IV. Maintenance and Upkeep of the Blades

(I) Daily Maintenance

1. Cleaning the Blades: After each production run, promptly clean the blades. Use a clean soft cloth or brush to remove residual film debris and impurities on the blade surface, preventing these impurities from accumulating on the blades and affecting their cutting performance and service life. For stubborn stains, specialized cleaning agents can be used, but be careful to avoid the cleaning agents corroding the blades.
2. Inspecting Blade Wear: Before each production day, conduct a comprehensive inspection of the blades, observing whether there is wear, chips, or cracks on the cutting edges. If significant blade wear is detected, replace the blades in a timely manner to prevent affecting cutting quality and the normal operation of the equipment. Meanwhile, record the usage time and wear condition of the blades to provide a reference for blade replacement and maintenance.

(II) Regular Maintenance

1. Sharpening the Blades: When the cutting edges of the blades show a certain degree of wear, sharpening can be carried out. Sharpening the blades requires the use of professional sharpening equipment and should be operated by skilled personnel. During the sharpening process, strictly follow the requirements of the blade material and cutting edge angle to ensure that the sharpened blades have sharp cutting edges and accurate angles. Generally, high-speed steel blades should not be sharpened too many times, and when the number of sharpening reaches a certain limit, new blades should be replaced in a timely manner. Carbide blades and ceramic blades are more difficult to sharpen, and professional blade sharpening service providers can be selected for processing according to the actual situation.
2. Lubricating the Blades: Regularly lubricate the installation parts and rotating components of the blades to reduce friction between the blades and the equipment, minimize wear, and extend the service life of the blades. Select appropriate lubricants, such as high-temperature grease and lubricating oil, and lubricate the corresponding parts according to the instructions of the equipment. During the lubrication process, be careful to prevent the lubricant from contaminating the cutting edges of the blades, which may affect cutting quality.

(III) Special Maintenance

In case of special situations such as long-term equipment shutdown or the blades coming into contact with corrosive substances, special maintenance of the blades is required. If the equipment is shut down for an extended period, remove the blades from the equipment, thoroughly clean and perform anti-rust treatment, and then store them properly to avoid the blades being affected by moisture, oxidation, and other factors. When the blades come into contact with corrosive substances, immediately rinse them with a large amount of clean water and use appropriate neutralizing agents for treatment according to the situation to prevent further damage to the blades by the corrosive substances.

 
The practical application of blades for film plastic cross-rotating battery strip cutting and bag-making machines involves multiple aspects, from the working principle to installation and debugging, from applications in different production scenarios to maintenance and upkeep. Each link is of vital importance. Only by correctly mastering the usage methods and maintenance key points of the blades can their performance be fully utilized, ensuring the efficient operation of the equipment and the production of high-quality products.
 
The above has provided a detailed introduction to the key points of blade application in actual production. If you would like to learn more about blade material comparisons, specific fault handling, or other related content, please feel free to let us know.
 
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