Molded Product Surface Finish for Color Uniformity
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Solution Overview
Problem
Molded products with a fabric-like surface created using thermo-expandable capsules often exhibit location-dependent color differences due to the varying frequency of contact, leading to a deterioration in appearance quality, as the outer shell of capsules can easily come off, causing color variations.
Innovation Solution
A method of manufacturing molded products involves preparing a matrix with dispersed capsules, forming unevenness through capsule expansion, and then performing finish processing to eliminate exposed outer shell portions and protruding portions from the surface, using techniques like surface heating or solvent contact to prevent color differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If capsules are used to create a fabric-like surface, then the surface texture and appearance are improved, but location-dependent color differences occur due to outer shell contact and coming off
Solution Approach 1:
The patent applies preliminary action by performing finish processing before the outer shells can come off during use. The surface is treated to eliminate protruding portions and expose outer shells while the molded product is still in its initial state, preventing the color difference problem from occurring in the first place
Solution Approach 2:
The patent applies the taking out principle by removing the problematic outer shell portions from the surface through finish processing. By eliminating the exposed outer shells and protruding portions that would otherwise come off during use, the source of color variation is extracted from the system
2Manufacturing precision
If finish processing is performed to eliminate outer shell portions, then color uniformity is improved, but additional processing steps are required
Solution Approach 1:
The patent merges the finish processing step with the existing molding process by integrating it into the manufacturing workflow. The surface treatment is performed as part of the molding sequence, combining multiple functions into a coordinated process rather than adding entirely separate operations
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 finish processing effectively suppresses color differences and maintains a desirable appearance quality by ensuring that outer shell protruding portions are removed, even in high-contact areas, resulting in a uniform surface color and improved design properties.
Implementation Method 1
a plurality of capsules dispersed within the matrix, and in which an unevenness is formed on a surface due to expansion of the capsules
Data Source
AI summary
A molded product includes a matrix formed of a polymer material and a plurality of capsules dispersed in the matrix. An unevenness is formed on a surface due to expansion of the capsules. Some of the capsules have expanded without bursting and include an exposed outer shell portion that protrudes from a surface, and/or some of the capsules have burst and include an outer shell protruding portion that protrudes outward from the surface. Finish processing is performed, which eliminates the outer shell protruding portions and/or the exposed outer shell portions from the surface. This results in a molded product in which a color difference due to frequency of contacting an object, etc. is not easily generated.