Decorative Sheet Bead Layering for Thermal Molding
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Solution Overview
Problem
Conventional wood-like decorative sheets lose their stereoscopic appearance and physical roughness when exposed to high temperatures or elongated forms, making them unsuitable for thermally molded parts, especially in high-temperature environments, and existing solutions either compromise on gloss or suffer from reduced resin holding power and stress issues during thermal molding.
Innovation Solution
A decorative sheet comprising a transparent resin film with a pattern printed layer and a colored base film, where the transparent resin layer and pattern printed layer contain beads of different sizes and colors, embedded within, to maintain the embossed pattern and design quality under heat and elongation, and for thermal molding into three-dimensional shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a transparent resin layer with beads is formed on the surface to maintain embossed state, then the stereoscopic appearance is preserved under heat, but the resin holding power is reduced and particles easily come off
Solution Approach 1:
The patent changes the chemical composition parameters of the transparent resin layer by incorporating specific polymers (acrylic resin, polyurethane resin, or polyester resin) with controlled molecular structures. This modifies the resin's physical properties to achieve optimal balance between maintaining embossed appearance under heat and providing sufficient holding power to prevent particle detachment.
Solution Approach 2:
The patent creates a composite structure by combining the transparent resin layer containing beads with an underlying base film layer. This multi-layer composite design allows the resin layer to provide stereoscopic appearance while the base film provides structural support and enhances overall durability, preventing particle come-off even when resin holding power is reduced.
2Strength
If a thermosetting resin is used to improve surface performance, then surface durability is enhanced, but elongation is lost and spring back occurs during thermal molding
Solution Approach 1:
The patent selects thermoplastic resins (acrylic, polyurethane, or polyester) with specific molecular chain structures that allow segmental mobility. These parameter changes in resin selection enable the material to exhibit both surface durability and elongation capability, avoiding the spring back problem associated with thermosetting resins while maintaining strength.
Solution Approach 2:
The patent employs thermoplastic resins that exhibit dynamic mechanical properties - they can deform elastically under stress (providing elongation for thermal molding) and then recover their shape. This dynamic behavior allows the decorative sheet to adapt to three-dimensional molding processes while maintaining surface durability, unlike static thermosetting resins.
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 decorative sheet maintains its appearance and design quality under thermal molding and high-temperature conditions, providing durability and resistance to friction, while allowing for curved surface applications and improved wear resistance.
Implementation Method 1
a transparent resin layer containing first beads... the first beads are embedded in the transparent resin layer
Implementation Method 2
the appearance of the frost and embossed pattern is not substantially changed by heat or elongation
Implementation Method 3
the decorative sheet... hardly changed in appearance by heat or elongation... can be designed for a grain, rift or metal texture with a high ability to follow a curved surface
Data Source
AI summary
A durable decorative sheet high in the ability to follow a curved surface with small appearance change by heat or elongation. A decorative sheet comprising a transparent resin film having two main surfaces, a transparent resin layer formed on the first main surface of the transparent resin film, a pattern printed layer arranged on the transparent resin layer, and a colored base film arranged on the second main surface of the transparent resin film. The transparent resin layer includes first beads, the pattern printed layer include second beads. The first beads are different from the second beads in content, color and/or particle size. The first beads and the second beads are embedded in the transparent resin layer and the pattern printed layer.