Product Details
High quality anti curling thermal lamination film is a functional composite film designed specifically to solve the problem of warping and deformation after traditional lamination. It is designed with a special substrate structure and adhesive layer formula, which can effectively counteract internal stress after heating and compounding, ensuring that the finished product maintains extremely high flatness in high temperature, high humidity or dry environments. It is the first choice for surface protection of high-end printed products, precision labels and industrial materials.
Core Definition and Anti Curling Mechanism
This is a multi-layer composite film made of PET (polyester) or BOPP (biaxially oriented polypropylene) as the substrate, coated with low shrinkage hot melt adhesive (such as EVA, PUR). Its "anti curling" characteristic originates from the stress balance design inside the material:
Pre stretching treatment of substrate: The base film undergoes special stretching and shaping during the production process, resulting in extremely low thermal shrinkage rate (usually ≤ 1.5%).
Bidirectional stress cancellation of adhesive layer: The shrinkage force generated by the adhesive during curing balances with the shrinkage force of the substrate, avoiding curling towards one side.
Symmetric structure design: Some high-end models adopt a symmetrical composite structure of "surface layer+adhesive layer+bottom layer" to further eliminate the mismatch of coefficient of thermal expansion (CTE) caused by material differences.
Key performance indicators (reflecting 'high quality')
Performance dimension | Indicator requirements | Application significance |
|---|---|---|
flatness | 24-hour warpage after composite ≤ 2mm/m | Ensure that the large format image does not have curled edges, suitable for digital proofing and art reproduction |
heat resistance | -20℃ ~ 80℃ No delamination, no embrittlement | Adapt to the alternating cold and hot environment of outdoor billboards and vehicle signs |
peel strength | ≥ 2.5 N/cm(For copperplate paper) | The film is firmly coated, with no bubbles or delamination at the edges |
transmittance | ≥ 92%(Light film) | Maximizing the saturation and sharpness of printed colors |
Environmental Protection Level | Compliant with RoHS standards, with no solvent residue | Suitable for sensitive fields such as food packaging and children's books |
Typical application scenarios
High end printed materials: album covers, artistic micro spray photos, museum grade replicas to prevent image distortion caused by film covering.
Industrial labels: electronic component labels, laboratory sample labels, ensuring that the labels remain flat and adhered even in extreme environments.
Packaging protection: The surface of cosmetic and luxury packaging boxes is scratch resistant, balancing aesthetics and durability.
Digital proofing: Sample production for advertising design companies to avoid curling after lamination and affecting customer confirmation results.
Process adaptation and selection suggestions
Equipment requirements: Suitable for hot laminating machine (recommended with preheating roller and cooling section), working temperature is usually 90-110 ℃.
Substrate matching:
Copperplate paper/matte paper: Low shrinkage PET based anti curling film is preferred to avoid curling caused by moisture absorption and expansion of the paper.
PVC/synthetic paper: Neutral adhesive layer (PUR type) should be selected to prevent chemical reactions between the adhesive and PVC.
Storage precautions: It should be stored flat in an environment below 25 ℃ and humidity of 40-60% to prevent the film roll from producing "lotus leaf edges" due to gravity.
This material is a key material for solving the pain points of deformation after laminating, especially suitable for art reproduction, high-end packaging, and industrial signage fields that have strict requirements for flatness