Views: 11
When using PET release film in die-cutting processes, the following issues are frequently encountered:
- Noise and Partial Reverse Peeling During Separation: When peeling the adhesive tape from the release film, some parts of the tape peel off in reverse, accompanied by a "popping" sound.
- Reverse Peeling: The material that should peel off does not separate as expected.
- Inability to Peel After Storage: After die-cutting and storage for some time, the adhesive tape cannot be separated from the release film.
- Oily Surface of Release Film: The release film surface feels oily, and the release layer seems prone to detaching.
- Static Electricity Issues: During unwinding and rewinding, the release film generates static electricity, attracting dust.
Common Causes of These Issues:
- Noise During Peeling: The noise is typically caused by excessive release force or uneven coating of the release layer.
- Reverse Peeling: This is mainly due to an improper match of release force. Two primary reasons include:
- Inconsistent Quality Control: Inadequate factory inspection, incomplete testing equipment, or unstable production processes result in significant variations in release force for the same product model. This leads die-cutting factories to use release films based on assumed release force due to habitual use.
- Poor Weather Resistance: The release layer’s durability degrades over time, causing significant changes in release force.
- Inability to Peel After Storage: This is generally caused by uneven coating. Severe coating omissions in some areas result in no release effect, making the adhesive tape impossible to peel. This is particularly problematic for rotary die-cutting processes.
- Oily Surface: The oily feel is primarily due to the release agent system used. Not all oily surfaces indicate poor quality; some oily release films have uniform coating and better residual adhesion rates. However, in some cases, the oily surface results from poor adhesion, causing the silicone oil to detach easily. These issues can be identified through testing.
- Static Electricity: Beyond physical methods to address static electricity, chemical treatments provide a more permanent solution. High-standard die-cutting facilities, such as those for optoelectronic applications, typically have cleanroom environments and static elimination equipment, minimizing this issue. For stricter requirements, antistatic-coated release films can be used.