ABS-PMMA Composite Layer Structure for Uniform In-Mold Decoration
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Solution Overview
Problem
Conventional methods for forming patterns or texts on object surfaces, such as spraying or printing, are cumbersome, environmentally harmful, and unsuitable for large-scale production due to low thickness uniformity and high material costs.
Innovation Solution
A composite layer structure composed of acrylonitrile butadiene styrene copolymer (ABS) and poly(methyl methacrylate) (PMMA) layers, combined through co-extrusion molding, which provides high hardness and tensile properties, allowing for in-mold decoration (IMD) or out-mold decoration (OMD) without additional printing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional spraying or printing processes are used to form patterns or texts on object surfaces, then visual effects and variability can be achieved, but the process becomes cumbersome, environmentally harmful, and unsuitable for large-scale production due to low thickness uniformity and high material costs
Solution Approach 1:
The patent combines the decorative pattern formation and the base material formation into a single co-extrusion molding process. The multi-layer composite structure integrates functional layers (base material, decorative layer with patterns/text, protective layer) that are formed simultaneously, eliminating the need for separate spraying or printing steps and achieving both thickness uniformity and high production efficiency
Solution Approach 2:
The decorative patterns and texts are pre-formed within the composite layer structure during the co-extrusion molding process before the final product is manufactured. This preliminary formation of decorative features eliminates subsequent decoration steps and ensures consistent thickness and quality throughout production
2Strength
If a base material composed of PC or ABS is used, then the material has good tensile properties, but the hardness is low making the surface liable to be damaged
Solution Approach 1:
The patent uses a multi-layer composite structure where the base layer provides tensile strength (using PC or ABS) and a separate protective layer with higher hardness is applied on top. This composite approach allows each layer to fulfill its specific function - the base layer maintains structural integrity while the protective layer resists surface damage
Solution Approach 2:
The patent segments the material structure into distinct functional layers: a base material layer for tensile strength and a separate protective layer for surface hardness. This segmentation allows optimization of each layer's properties independently, with the protective layer specifically designed to resist scratches and damage while the base layer maintains overall structural strength
3Temperature
If a protective layer is applied on PC or ABS base material to enhance hardness and scratch resistance, then surface durability is improved, but the complexity of the structure and processing increases
Solution Approach 1:
The patent merges the formation of the base material layer and the protective layer into a single co-extrusion molding process. The multi-layer composite structure is formed in one continuous operation, reducing processing complexity despite the multi-layer structure. The layers are bonded together during the extrusion process itself, eliminating the need for separate application and bonding steps
4Temperature
If PMMA is used as base material to achieve high hardness, then scratch resistance is improved, but the material is easily cracked during molding making heat pressurizing difficult
Solution Approach 1:
The patent uses PMMA for the protective layer to achieve high hardness and scratch resistance, but combines it with a base layer material (PC or ABS) that has better crack resistance during molding. The composite structure allows the PMMA to provide surface hardness while the base layer provides structural stability and resistance to cracking during the heat pressurizing process
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 composite layer structure achieves decorative effects with high gloss, matte, and geometric textures, reducing costs and improving production yields by integrating dyeing processes during fabrication.
Implementation Method 1
A composite layer structure composed of acrylonitrile butadiene styrene copolymer (ABS) and poly(methyl methacrylate) (PMMA) layers, combined through co-extrusion molding
Data Source
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AI summary
Provided is a composite layer structure comprising a first layer and a second layer. The second layer is disposed on the first layer. A material of the second layer is different from a material of the first layer. The composite layer structure is formed by a co-extrusion molding film process, and the composite layer structure has a thickness of between 0.01 mm and 1 mm. Further, the present invention also provides a decorated molding article and a method for fabricating the same.