Plastic Molded Product Surface Holes for Gloss and Durability
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Solution Overview
Problem
Plastic molded products with small specular glossiness face durability issues due to shallow concave and convex portions on the mold surface, leading to poor light reflection and easy breakage from external impacts.
Innovation Solution
The formation of holes on the mold surface with specific depth and diameter ratios, where the depth is set to ¼ of the diameter, and the bottom portion of the holes is positioned deeper than the reference plane, reduces specular glossiness and enhances durability by dispersing external forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the mold surface is roughened by electric discharge processing or sandblast processing, then the specular glossiness of the plastic molded product is reduced, but the concave and convex portions formed on the mold surface are shallow, leading to poor light reflection control
Solution Approach 1:
The invention changes the geometric parameters of the surface structure by forming conical protrusions with specific dimensions (depth to diameter ratio between 0.2-0.5) rather than using shallow irregularities. This parameter optimization allows the surface to effectively control specular reflection while maintaining manufacturability through standard processing techniques.
Solution Approach 2:
The invention employs conical protrusions with curved surfaces instead of sharp angular irregularities. The conical shape provides gradual light reflection angles that effectively reduce specular glossiness while the curved geometry improves durability by distributing stress more evenly compared to sharp edges.
2Illumination intensity
If conical protrusions are formed on the mold surface to reduce specular glossiness, then light reflection is controlled, but the tip portions are easily broken by external impact and scraped by friction, resulting in poor durability
Solution Approach 1:
The conical protrusions feature curved surfaces that gradually transition in diameter, eliminating sharp edges and corners. This curved geometry reduces stress concentration points, making the protrusions more resistant to breakage from external impacts and scraping while maintaining their light reflection control function.
Solution Approach 2:
The invention optimizes the dimensional parameters of the conical protrusions, specifically setting the depth-to-diameter ratio between 0.2-0.5. This parameter range ensures the protrusions are sufficiently tall to control specular reflection but not so tall that their tips become excessively vulnerable to mechanical damage, thereby balancing optical performance with durability.
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
This configuration significantly reduces specular glossiness and improves the durability of the plastic molded product by preventing specular reflection and dispersing external forces, resulting in a more robust and aesthetically pleasing finish.
Implementation Method 1
When light reaches the plastic molded product, the light reaches bottoms of the concave portions, and is specularly reflected out of a hole, so that specular glossiness of the plastic molded product is reduced
Data Source
AI summary
A plastic molded product includes a plastic body provided with a plurality of holes, which are recessed in a common depth direction, on a surface of the plastic body. The holes include: an inner surface including an inlet a specific reference plane perpendicular to the depth direction and including at least a portion of the inlet and a depth reference point, which is spaced away from a center point on an inlet side of the specific reference plane toward a bottom side of the hole, the depth reference point being spaced away by a distance equal to ¼ of a maximum value of an inlet side bore diameter on the specific reference plane. A deepmost portion of the inner surface of the hole is in a position which coincides with the reference point or is deeper than the reference point toward the bottom side.