Decorative Sheet Surface Protection Layer Cracking Prevention
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Solution Overview
Problem
Current methods for creating decorative molded articles with a metallic style face challenges in achieving excellent abrasion resistance and three-dimensional moldability, as existing surface protection layers often crack or become damaged during the molding process, and the use of ionizing radiation curable resins complicates the manufacturing process and increases costs.
Innovation Solution
A decorative sheet comprising a thin metal film layer, a surface protection layer made of cured ionizing radiation curable resin containing polycarbonate(meth)acrylate and/or acrylic silicone (meth)acrylate, and a base film, where the surface protection layer is firmly attached to the thin metal film layer, providing enhanced abrasion resistance and moldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surface protection layer is provided on the decorative sheet to improve damage resistance, then abrasion resistance is improved, but cracks are generated on the curved surface during three-dimensional molding
Solution Approach 1:
The patent changes the chemical composition parameters of the surface protection layer by incorporating silicone resin and controlling the ratio of flexible resin to rigid resin. This compositional adjustment allows the layer to maintain high damage resistance while gaining sufficient flexibility to prevent cracking during three-dimensional molding processes.
Solution Approach 2:
The surface protection layer is formulated as a composite material system comprising multiple resin components: silicone resin for flexibility and crack prevention, rigid resin for abrasion resistance, and functional resin for adhesion. This composite structure enables the layer to simultaneously achieve damage resistance and crack-free molding by combining the advantageous properties of different resin types.
2Reliability
If ionizing radiation curable resin is used to increase cross-link density for improving abrasion resistance, then abrasion resistance is improved, but the manufacturing process becomes complicated and costs increase
Solution Approach 1:
The patent replaces the ionizing radiation curing mechanism with a thermal curing system. The surface protection layer is cured by heating during the molding process itself, eliminating the need for separate UV irradiation equipment and complex curing process control. This substitution maintains adequate abrasion resistance through proper resin selection while significantly simplifying the manufacturing process.
Solution Approach 2:
The curing process of the surface protection layer is merged with the molding process. The thermal energy required for molding the decorative sheet simultaneously cures the surface protection layer, combining two operations into one and eliminating the need for separate curing equipment and process steps.
3Shape
If the decorative sheet is drawn to fit the mold shape during molding, then three-dimensional shape is achieved, but the surface protection layer cracks due to excessive drawing
Solution Approach 1:
The patent adjusts the rheological and mechanical parameters of the surface protection layer by controlling resin composition and molecular structure. This enables the layer to undergo greater deformation without cracking, allowing the decorative sheet to be drawn into complex three-dimensional shapes while maintaining surface integrity.
Solution Approach 2:
The surface protection layer is designed with flexible molecular chains and appropriate thickness to act as a flexible film that can conform to three-dimensional mold shapes. The incorporation of silicone resin and control of layer thickness provide the necessary flexibility for the layer to stretch and conform to complex geometries without developing cracks.
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 proposed solution effectively enhances the abrasion resistance and three-dimensional moldability of decorative molded articles while maintaining excellent chemical resistance, reducing the likelihood of cracking and simplifying the manufacturing process.
Implementation Method 1
a surface protection layer made of cured ionizing radiation curable resin containing polycarbonate(meth)acrylate and/or acrylic silicone (meth)acrylate
Data Source
AI summary
The decorative sheet for three-dimensional molding includes a thin metal film layer, a surface protection layer, and a base film, at least the thin metal film layer and the surface protection layer being disposed on the base film in this order, in which the surface protection layer consists of a cured material of an ionizing radiation curable resin composition containing a polycarbonate(meth)acrylate and/or an acrylic silicone (meth)acrylate. The decorative sheet for three-dimensional molding, which has excellent moldability, provides a decorative molded article with a metallic style in excellent design and with excellent abrasion resistance.