In-Mold Label Friction and Adhesion via Silicone Release
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Solution Overview
Problem
Existing in-mold labels face issues with dirt and scratch susceptibility, decorativeness, visibility, friction when stacked, and adhesive strength to molded bodies.
Innovation Solution
A laminate comprising a heat-sensitive adhesive layer with a higher fatty acid amide and a protective layer with a silicone-based release agent, which reduces friction and maintains strong adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a protective layer comprising photocurable acrylic resin is applied to improve decorativeness, hardness, and surface smoothness, then the surface quality improves, but the coefficient of friction increases causing simultaneous taking of multiple labels during conveyance
Solution Approach 1:
The patent modifies the chemical composition parameters of the protective layer by incorporating fluorinated compounds and silicon-based release agents in specific concentrations (fluorinated compound: 1-50 wt%, silicon-based release agent: 1-50 wt%). This parameter adjustment reduces the coefficient of friction while preserving surface quality, enabling smooth label conveyance without simultaneous taking.
Solution Approach 2:
The patent creates a composite protective layer by combining photocurable acrylic resin with fluorinated compounds and silicon-based release agents. This composite formulation achieves a balance between surface properties (decorativeness, hardness, smoothness) and friction characteristics, resolving the contradiction between surface quality and conveyance ease.
2Object-affected harmful factors
If a protective layer is applied to protect the surface from dirt and scratches, then surface protection improves, but the adhesive strength of the in-mold label to the molded body decreases
Solution Approach 1:
The patent applies different functional components at different locations within the protective layer system. The fluorinated compound and silicon-based release agent are incorporated into the protective layer formulation in specific amounts (1-50 wt% each), creating local compositional variation that maintains surface protection while controlling friction and adhesive properties.
Solution Approach 2:
The patent optimizes the concentration parameters of fluorinated compounds and silicon-based release agents within the protective layer. By controlling these parameters within specific ranges (1-50 wt%), the patent achieves sufficient surface protection and friction reduction while preventing excessive interference with adhesive strength to the molded body.
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 solution provides in-mold labels that are less susceptible to dirt and scratches, maintain excellent decorativeness and visibility, reduce friction when stacked, and ensure strong adhesive strength to molded bodies.
Implementation Method 1
the protective layer contains a silicone-based release agent... the coefficient of friction when the in-mold labels are in contact with each other increases
Implementation Method 2
a heat-sensitive adhesive layer, a substrate layer, and a protective layer in this order... the heat-sensitive adhesive layer contains a higher fatty acid amide
Data Source
AI summary
A laminate including at least a heat-sensitive adhesive layer, a substrate layer, and a protective layer in this order, wherein the substrate layer has a thermoplastic resin film, the heat-sensitive adhesive layer contains a higher fatty acid amide, and the protective layer contains a silicone-based release agent. An in-mold label comprising this laminate. A molded body obtained by affixing this in-mold label. An in-mold label in the form of a roll obtained by winding this in-mold label. This invention provides an in-mold label that is less susceptible to dirt and scratches, excellent in decorativeness and visibility, less likely to cause friction when the labels are stacked on each other, and easy to handle, and has strong adhesive strength to a molded body.