Precision Slitting

Precision slitting is a high-precision cutting process that converts large rolls of materials (such as metal, plastic, steel, and aluminum) into smaller rolls with specific widths. This technology is widely used across various industries and, due to its high precision and efficiency, plays a key role in fields that require strict quality control and accuracy.

Sage specializes in producing plastic films such as PVA, WTP, IMD, and OMD, and provides precision slitting services, primarily focusing on plastic film materials.

The precision slitting industry has a wide range of applications. Different application fields correspond to different types of precision slitting machines to meet the needs of various industries. Sage Cheng Feng focuses on providing precision slitting machines suitable for various types of plastic films. The following are common application areas of precision slitting.

• Electronics and Semiconductors: Used for precise cutting of optical films, conductive films for touch panels, flexible electronics, lithium battery foils, printed circuit boards (PCB), thin-film transistors (TFT), and sensor materials.
• Lithium Battery Materials: Precisely cutting lithium battery anode and cathode foils and battery separators to improve battery performance and safety.
• Photovoltaic Industry: Used for cutting solar films, photovoltaic films, and protective films for photovoltaic components to ensure compatibility with PV modules.
• Optics and Display Technology: Precisely cutting display protective films, lens films, optical films, polarizers, and LCD panels to ensure high precision and quality.
• Medical Field: Precise cutting of medical film materials such as patches, breathable films, diagnostic reagent films, and medical devices to ensure stability and safety.
• Packaging Materials: Used for cutting food packaging films, cling films, aluminum foil, and plastic films, ensuring dimensional accuracy and meeting automated packaging needs.
• Automotive Industry and Metal Materials: Cutting steel sheets, aluminum alloys, interior films, battery modules, automotive window films, insulation films, metal foils, steel strips, plastic strips, aluminum plates, etc., to meet various shapes and size requirements, widely used in construction, machinery, aerospace, and other fields.
• Printing and Media: Cutting printing materials and digital printing films, applied in the printing and media industry.
• Aerospace and Military: Precision cutting of aerospace materials and precision metal materials for military equipment, used in aerospace and defense industries.

• Precision: Precision slitting requires high accuracy, typically controlled at the micron level, and is suitable for high-precision fields such as electronics and semiconductors. In contrast, conventional slitting has lower precision and is suitable for general metals, plastics, and other materials.
• Materials and Applications: Precision slitting is commonly used for advanced materials such as lithium battery foils and optical films, while conventional slitting is mainly used for general metals and packaging materials.
• Equipment: Precision slitting machines feature higher accuracy control and use advanced tension control systems and precision guide rails to ensure that each slit roll has exactly the same width, smooth edges, and matches the set size. Conventional slitting machines are simpler, making it harder to achieve the same level of precision and consistency.
• Cutting Quality: Precision slitting produces smooth, burr-free edges, while conventional slitting may be relatively rough.
• Cost: Precision slitting equipment and processes are more expensive, while conventional slitting is more cost-effective.

Precision slitting is suitable for high-end products with strict accuracy requirements, while conventional slitting is suitable for general material cutting.

Precision slitting machines can be categorized by the material being processed, such as film slitting, paper slitting, metal foil slitting, and fabric slitting. Sage Cheng Feng focuses on providing precision film slitting services. Precision film slitting is a highly accurate cutting process mainly used for processing film materials, commonly applied to plastic films, optical films, and electronic films. This process is characterized by the ability to cut large rolls of film into smaller rolls or strips while maintaining high precision and consistency. Precision slitting typically requires precise control of cutting width, thickness, edge smoothness, and even micron-level accuracy.

Main features and process of precision film slitting:

• High-precision control: Precision slitting uses advanced equipment and technology, such as high-precision tension control systems, precision guide rails, and tool settings, ensuring that each slit film has consistent width and smooth edges.
• Consistency: During slitting, each roll of film can meet preset specifications, including width, thickness, and length, which is especially important in high-precision applications.
• Applications: Precision film slitting is widely used in electronics, semiconductors, optics, lithium battery foils, medical, and packaging industries. In fields requiring extremely high precision (such as electronic packaging films and semiconductor process materials), this technology significantly improves product quality and reliability.
• Cutting quality: Precision slitting produces smooth, burr-free, and deformation-free edges, which is crucial for subsequent processing such as lamination and printing.

Precision film slitting is not just simple cutting; it requires advanced technology and equipment support to ensure precision, quality, and production efficiency, making it suitable for high-end materials and applications.

• Uneven edges or burrs: This is usually caused by dull blades, unstable tension control, or inaccurate guide rail alignment. Uneven edges can affect subsequent use and processing.
• Dimensional deviation: The width of the slit film may deviate after slitting, which is usually related to the tension control system, blade settings, or the characteristics of the material itself. Dimensional deviation can affect production line automation and product compatibility.
• Wrinkling or deformation: This is caused by excessive tension on the material during the slitting process or improper equipment settings, leading to wrinkles or deformation after slitting, which affects subsequent processing.
• Tearing or breakage: When the film material is too brittle or the blade is too dull, tearing or breakage is likely to occur during the slitting process. This not only wastes material but may also cause machine failure.
• Surface damage: The film surface may be damaged due to friction, poor contact, or unstable equipment during the cutting process. This is particularly critical for applications requiring defect-free surfaces (such as optical films).
• Unstable tension: If the tension control system is improperly set, it may cause excessive stretching or slackness of the film during the slitting process, which affects cutting quality and consistency.
• Material rebound: Some materials may exhibit rebound after being cut, resulting in dimensional instability. This usually occurs in thicker or harder film materials.
• Speed mismatch: If the slitting speed does not match the material characteristics or equipment capabilities, it may result in uneven cutting or excessive wear, thereby affecting the slitting quality.
• Static buildup: In some plastic film slitting processes, static electricity buildup may cause materials to stick together, increasing the difficulty of slitting and potentially leading to equipment failure.

Resolving issues during the slitting process requires precise equipment calibration, proper blade maintenance, a stable tension control system, and slitting parameter settings tailored to the characteristics of the material. Sage Cheng Feng utilizes precision design and high-performance customized machines, combined with advanced technology, to deliver outstanding performance in precision control, stability, and adaptability.

Our equipment can effectively address requirements such as tension control, blade cutting, and static management, significantly reducing defect issues during the slitting process and greatly improving production efficiency and product quality. Our machines are specifically designed for high-end application scenarios and can resolve technical challenges such as uneven edges, dimensional deviation, and material wrinkling, fully meeting customer demands for precision slitting and high-quality products.

The slitting precision control of a precision film slitting machine is the key to ensuring that the film maintains standardization and high quality during the slitting process. The methods to control slitting precision mainly include the following aspects:

• Tension control: During the film slitting process, the stability of tension is the key to slitting precision. Using a tension control system, such as a tension controller driven by a servo motor, can adjust the tension of the film in real time, preventing the film from deforming or breaking due to excessive or insufficient tension. This helps maintain the uniformity and accuracy of slitting.
• Adjustment of slitting tools: The tool settings of the slitting machine should maintain good parallelism and cutting angles, so as to ensure smooth cutting edges without burrs. The precision and sharpness of the tools directly affect slitting accuracy, so regular inspection and maintenance of the tools are required.
• Precise control of the transmission system: A precise servo drive system can ensure that the film passes through the slitting machine at a stable and accurate speed, avoiding slitting errors caused by uneven or excessive speed.
• Stability of the material feeding system: The material feeding system must maintain uniformity to prevent the film from shifting position or forming waves when entering the slitting machine, thereby ensuring slitting accuracy.
• Fine adjustment of slitting gap: The slitting gap of the machine needs to be finely adjusted according to the thickness and material of the film. Too large or too small a gap will affect slitting precision. Precision slitting machines are usually equipped with precise adjustment devices for fine-tuning the gap between the blades.
• Temperature control: Some film materials (such as PE and PVC) are sensitive to temperature. Therefore, controlling the environmental temperature and the working temperature of the film during the slitting process is very important for maintaining slitting accuracy.
• Imaging or fiber optic detection system: Modern slitting machines can be equipped with imaging recognition systems or fiber optic sensing devices to detect the position and edge accuracy of the slitted film, and use an automatic correction system to ensure precision.

Whether burrs will appear on the surface of the film after slitting depends on multiple factors, including the settings of the slitting machine, the properties of the film material, and the condition of the cutting tools. The key influencing factors include the following:

• Tool condition: Sharp tools can ensure clean cutting and reduce burrs. Tool wear will lead to rough edges, so regular maintenance is required.
• Slitting gap: If the gap is too large, it may cause incomplete cutting; if too small, it may cause excessive compression. Precise adjustment of the gap is particularly important.
• Material properties: Softer or thinner films (such as PVC) are more prone to burrs, while harder films may crack or shatter.
• Operating conditions: If the cutting speed and tension are too fast or unstable, it will cause material deformation. The speed should be kept moderate and the tension stable.
• Cooling measures: An appropriate cooling system can reduce the temperature during the cutting process and improve edge quality.

By maintaining the cutting tools, precisely adjusting parameters, and ensuring stable operation, burrs can be effectively reduced and the quality of film slitting can be improved.

The maximum cutting film thickness and width of a precision slitting machine vary depending on multiple factors, mainly including machine design, blade configuration, technical parameters of the slitting machine, and the characteristics of the film material. The following are some common ranges and influencing factors:

• Film thickness
  - General precision slitting machines: 10 micrometers (μm) to 500 micrometers (μm), and some high-end equipment can handle materials from 500 micrometers (μm) to 1 centimeter (mm) or thicker.
  - Evergreen EG-7003AT slitting machine used by Sage Chengfeng Intelligence: The maximum film thickness can reach 400 micrometers (μm), suitable for most film applications.
• Film width range
  - General precision slitting machines: 1 meter (m) to 2.5 meters (m), and special equipment can reach 3 meters (m) or more.
  - Evergreen EG-7003AT slitting machine: The maximum film width can reach 1300 centimeters (mm).
• Influencing factors
  - Blade configuration: The blades of a precision slitting machine must be selected according to the thickness and material of the film. Thicker films require stronger cutting force and sharper blades; thinner films require more precise blades and smaller cutting gaps.
  - Machine structure: Wide films require larger slitting machines for support, and high-precision drive and positioning systems to ensure uniform and accurate slitting.
  - Film material properties: Different film materials have different requirements during slitting. Brittle films (such as plastic films) are not suitable for overly thick or wide cutting, while flexible films (such as thin aluminum foil) require precise tension control.

Waste is generated during the film slitting process, such as edge trims, cutting debris, and burrs. The following summarizes common waste handling methods:

1. Recovery and reuse of edge trims
   • Recycling of edge trims: The plastic or metal edge trims generated during the slitting process can be recycled and reprocessed to reduce material waste.
   • Automatic recovery devices: Modern slitting machines are equipped with automatic waste collection and compression systems, making it easier for subsequent handling and reuse, and improving overall efficiency.
2. Handling of debris and burrs
   • Debris collection system: Debris generated during the cutting process is collected through vacuum or air flow systems and transported to a dust collection device to prevent fine particles from dispersing into the air.
   • Burr removal equipment: Burrs are removed through tool fine-tuning or edge trimming systems to ensure the quality of subsequent processing.
3. Waste classification and sorting
   • Material classification: Waste is sorted according to film material (such as plastic films, metal films), facilitating different recycling methods.
   • Avoiding cross-contamination: For high-end film materials (such as semiconductor films and electronic films), precise classification is carried out to ensure reuse or safe disposal.
4. Environmental protection and waste reduction measures
   • Reduction of waste generation: Through precision design of the slitting machine and optimized cutting, material utilization is improved and waste is reduced.
   • Eco-friendly recycling technology: During the recycling process, waste may undergo multiple treatments such as cleaning, compression, and melting. It can then be made into recycled materials or used for other industrial purposes, helping to reduce environmental impact and meeting modern sustainability requirements.
5. Reuse and safe disposal of waste
   • Waste reuse: Plastic film waste can be melted and modified for use in new product manufacturing, achieving resource recycling.
   • Safe disposal of waste: Waste that cannot be recycled must be incinerated or landfilled in accordance with environmental regulations to avoid pollution.

Waste handling in the film slitting process includes collection, classification, recycling, and environmentally friendly treatment. It not only improves production efficiency and reduces waste, but also mitigates environmental impact and lowers operating costs.

To ensure quality control and dimensional accuracy in precision slitting, management and inspection can be carried out from the following aspects:

1. Selection of high-precision equipment
   • Use high-precision slitting machines with stable operating performance and fine adjustment functions to ensure accuracy in every slitting process.
   • The equipment must be regularly maintained and calibrated to ensure it is in good working condition and to prevent slitting quality from being affected by equipment failure or wear.
2. Inspection of raw materials
   • Before slitting, conduct a comprehensive inspection of raw materials to ensure that thickness, width, surface quality, etc., meet the requirements. This helps ensure consistency and stability of the final slitted products.
   • For example, the uniformity and defect-free condition of materials such as metals and plastics are crucial to slitting quality.
3. Precision measurement and monitoring
   • Use precision measurement tools during the slitting process, such as laser distance meters, electronic calipers, and vision inspection systems, to monitor dimensions and shapes after slitting in real time.
   • Set up automated inspection systems that can identify and alert dimensional deviations during the slitting process in real time.
4. Process (procedure) settings and adjustments
   • Control process parameters during slitting, such as cutting speed, blade pressure, and tension, as these directly affect slitting accuracy.
   • Process adjustments should be carried out regularly, adjusting parameters according to the characteristics of different materials.
5. Strict quality inspection standards
   • Establish clear quality inspection standards to ensure that each batch of slitted products meets customer requirements in terms of dimensions and surface quality.
   • Regularly conduct sampling inspections and record all inspection data to promptly identify and correct issues.
6. Data analysis and feedback mechanism
   • Utilize big data and intelligent systems to collect and analyze various data during the slitting process, enabling continuous improvement through data feedback.
   • Establish a comprehensive feedback mechanism so that when quality fluctuations are detected, the production process can be quickly adjusted to prevent issues from spreading.
7. Operator training and experience accumulation
   • Provide professional training for operators to enhance their operational skills and quality awareness.
   • Experienced operators can promptly identify abnormalities during the slitting process and take corrective actions to ensure stable product quality.
8. Quality records and traceability
   • Establish complete quality records and traceability data, labeling each batch of slitted products in detail to trace the source of issues and respond quickly when quality problems occur.

By integrating these measures, it is possible to effectively ensure quality control and dimensional accuracy in precision slitting, achieving a stable and efficient production process.

The processing speed and delivery time of precision film slitting depend on the following factors:

1. Type and thickness of the film
   • Metal films and high-performance plastic films are more difficult to cut, which affects processing speed; thinner films can be slit faster, but if the film is too thin, it may increase the difficulty of slitting.
2. Performance of slitting equipment
   • Advanced equipment can improve both speed and precision, while older equipment may require more manual intervention.
3. Slitting width and precision requirements
   • Wide-width slitting requires more time to ensure accuracy; micron-level precision requires slower speed and more detailed adjustments.
4. Processing and quality inspection
   • High-precision slitting requires more time for detailed inspection (such as dimensional accuracy and surface defects).
5. Delivery time
   • Standard delivery time: approximately 3 to 7 days, depending on processing difficulty; rush orders: approximately 1 to 2 days, usually requiring additional fees.

The processing speed is approximately several meters to several tens of meters per minute, and the delivery time varies depending on order quantity, material, and precision requirements. For an accurate delivery schedule, please contact Sage Chengfeng and provide your product specifications and requirements. We will provide a more precise delivery estimate based on the specific situation.

• Thickness uniformity: The thickness of the film must be uniform to ensure that the quality of each slit film is consistent. If the film thickness is not uniform, it may affect the precision of slitting, resulting in product dimensions that do not meet the requirements.
• Surface smoothness: The surface of the film should be smooth and free of defects, avoiding uneven surfaces or bubbles, as these will affect the stability during the slitting process and subsequent use.
• Tensile strength and elongation: The film should have sufficient tensile strength and elongation to prevent breakage or tearing during the slitting process. Insufficient tensile strength will affect the stability and precision of slitting.
• Bending performance and flexibility: The film should have appropriate flexibility, avoiding materials that are too rigid or too brittle, which may break during slitting. Proper flexibility ensures that the film remains stable after slitting and can adapt to subsequent processing.
• Surface adhesion and cleanliness: The surface of the film should be kept clean and free of contaminants such as oil and dust. These contaminants can affect the operation of the slitting machine and may impact the post-processing results of the film.
• Physical and chemical stability: The film needs to have a certain level of physical and chemical stability to withstand the mechanical forces and environmental changes during the slitting process, such as fluctuations in temperature or humidity, to avoid degradation of film performance after slitting.

These quality requirements ensure a smooth film slitting process and guarantee the quality of the final product.