Slitting machines play a vital role in the OCA glue (optically clear adhesive) and protective film industry, mainly used to cut large rolls of raw materials into small rolls of specific width and length required by customers to meet the precision needs of end applications such as display lamination, electronic product protection, etc. The following are its specific applications and key points:
1. Application scenarios
• OCA glue slitting
OCA adhesive is used for interlayer bonding of touch screens and display screens (such as mobile phones and tablets), and has extremely high requirements for cleanliness, dust-free, bubble-free, and edge flatness. The slitter needs to ensure:
◦ Non-damaging slitting: avoid deformation of the adhesive layer or overflow of the edge, which will affect the lamination effect.
◦ High-precision control: The tolerance usually needs to be controlled within ±0.05mm to avoid misalignment during lamination.
◦ Anti-stick treatment: During slitting, it may be necessary to cooperate with the anti-stick material (release film) to synchronize slitting to prevent the contamination of the adhesive surface.
• Protective film slitting
Protective films (such as PET and PE materials) are used for temporary protection of screens and shells, and must be guaranteed to be free of scratches and static electricity:
◦ Smooth edges: Avoid slitting burrs from scratching the protected surface.
◦ Tension control: Prevents the film from stretching, deforming or curling.
◦ Static Elimination: Equipped with an ionizing fan during slitting to avoid dust adsorption.
2. Key technical requirements of slitting machine
• High-precision turret system
Round knife (rotary cutting) or flat knife (straight cutting) is used, and the knife material needs to be wear-resistant (such as tungsten steel, ceramic) to ensure that the cut is smooth and free of burrs.
• Tension control system
Closed-loop servo control, adapting to the adhesive material of OCA adhesive and the light and thin characteristics of the protective film, avoiding stretching or wrinkling of the material.
• Cleaning and dusting
Equipped with a dust-free environment or an in-line cleaning device to prevent particles from contaminating the adhesive surface or film surface.
• Automation features
◦ Automatic Web Guide (EPC): Maintains material transport alignment.
◦ In-line inspection: The vision system detects slitting defects (e.g., cracks, bubbles).
◦ Cut-to-length slitting: Set the roll diameter and length according to the demand.
3. Special needs of the industry
• OCA glue challenges
◦ The adhesive layer is soft and easy to deform, and the blade needs to be cooled at low temperature or cooled during slitting to avoid adhesive melting.
◦ Multi-layer composites (such as OCA+ release film) need to be slitted synchronously to avoid interlayer misalignment.
• Diversity of protective films
◦ Different thickness (0.03mm~0.2mm) and material (matte, anti-glare) need to adjust the slitting parameters.
◦ Some functional protective films (such as anti-blue light, anti-privacy film) need to avoid slitting stress affecting optical performance.
4. Equipment selection suggestions
• OCA glue slitting: Dust-free slitting machine is preferred, equipped with constant tension control and precision inflatable shaft.
• Protective film slitting: focus on static elimination and surface protection, optional automatic labeling or packaging machine.
5. Future Trends
• Intelligent: Integrate AI defect detection and adjust slitting parameters in real time.
• Green production: reduce waste generation and optimize slitting paths (e.g. spiral slitting).
• Multi-functional integration: slitting + die-cutting + laminating integrated equipment to improve efficiency.
Through high-precision slitting machines, OCA adhesive and protective film can meet the strict requirements of material cleanliness and dimensional accuracy in consumer electronics, automotive display and other fields, which directly affects the yield and performance of the final product.
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