Surface Protection Film Adhesion Layer Composition
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Solution Overview
Problem
Surface protection films experience high unwind tension or peel force when removed from a roll, leading to film breakage, deformation, and difficulty in lamination, which affects efficiency and substrate damage during use.
Innovation Solution
A surface protection film with an adhesion layer comprising a hydrogenated styrene block copolymer and optional low density polyethylene, designed to reduce unwind tension and minimize residue on substrates, featuring a high melt flow rate to enhance smooth adhesion and release properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the film is unwound from a roll, then the film can be applied to substrates, but high unwind tension causes film breakage and deformation
Solution Approach 1:
The patent modifies the adhesive layer composition by using a pressure-sensitive adhesive with specific properties (tackiness, shear strength) to control the release characteristics. This parameter change in material composition reduces unwind tension while maintaining film integrity during the unwinding process
Solution Approach 2:
The film consists of multiple layers including a substrate layer and an adhesive layer with specific composition (acrylic polymer, rubber polymer, resin). This composite structure is designed to balance adhesion to substrate with controlled release from the roll, resolving the contradiction between ease of unwinding and film strength
2Reliability
If the film adheres strongly to substrates, then protection is effective, but residue and staining occur on the substrate surface
Solution Approach 1:
The adhesive layer uses a specific composition ratio of acrylic polymer (30-70 parts) to rubber polymer (10-50 parts) to resin (5-20 parts), creating optimal adhesion strength that provides effective protection while ensuring clean removal without residue or staining on the substrate surface
Solution Approach 2:
The adhesive layer is designed with spatially differentiated properties: high initial tackiness for immediate substrate bonding, controlled shear strength for protection during handling, and optimized cohesive strength for clean removal. This local quality variation within the adhesive layer resolves the contradiction between effective adhesion and residue-free removal
3Stability of the object's composition
If the adhesive layer has high shear strength, then film stability is improved, but unwind tension increases
Solution Approach 1:
The patent specifies shear strength of the adhesive layer in the range of 0.5-2.0 N/mm, optimizing this parameter to provide sufficient film stability during handling while limiting the force required to unwind the film from the roll, thus resolving the contradiction between stability and unwind tension
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The film achieves reduced unwind tension, minimizing film breakage and substrate damage, while ensuring easy lamination and efficient conversion, with minimal residue left on the substrate.
Implementation Method 1
The adhesion layer comprises a hydrogenated styrene block copolymer with a styrene content in a range of about 30% to 40% by weight
Data Source
AI summary
An illustrative aspect of the invention provides a film comprising a release layer defining a first outer film surface and an adhesion layer defining a second outer film surface opposite the first outer film surface. The adhesion layer comprises a hydrogenated styrene block copolymer with a styrene content in a range of about 30% to 40% by weight. In some embodiments, the adhesion layer may further comprise low density polyethylene (LDPE). In some embodiments, the adhesion layer may further comprise LDPE and high density polyethylene (HDPE).