Resin Molded Body Liquid Repellency Laser Structuring
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Solution Overview
Problem
The liquid repellency of resin molded bodies deteriorates over time due to the degradation of fluorine coatings, and there is a risk of small droplets entering between rib projections, further reducing liquid repellency.
Innovation Solution
A resin molded body with an uneven structure surface formed by laser processing, featuring alternately arranged projections and recesses, which enhances liquid repellency without relying on fluorine coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorine coating is applied to rib projections to achieve liquid repellency, then liquid repellency is improved, but the coating deteriorates over time causing liquid repellency to deteriorate
Solution Approach 1:
The invention extracts and eliminates the fluorine coating layer from the surface structure. Instead of relying on the coating, the patent creates an uneven structure directly on the resin base material surface through laser processing, forming projections and recesses that provide liquid repellency without any coating material.
Solution Approach 2:
The invention replaces the expensive and short-lived fluorine coating with a permanent structural feature built into the base material itself. The uneven structure is formed directly in the resin through laser processing, creating a durable, maintenance-free solution that lasts the entire lifecycle of the product.
2Reliability
If small droplets enter between rib projections, then liquid repellency deteriorates, but the conventional structure allows droplet penetration
Solution Approach 1:
The invention applies local quality by creating specific geometric features (protrusions with enlarged distal ends) at critical locations on the surface. These enlarged distal ends act as barriers that prevent droplet penetration into recesses, while maintaining the overall uneven structure for liquid repellency.
Solution Approach 2:
The invention implements preliminary anti-action by designing the protrusion geometry with enlarged distal ends that proactively prevent droplet penetration before it can occur. The structure is configured in advance to repel and block droplets, preventing the harmful effect of liquid entering recesses.
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 resin molded body achieves high and stable liquid repellency by creating a surface with a static pure-water contact angle greater than 120°, preventing droplets from entering recesses and maintaining repellency over time.
Implementation Method 1
forming the uneven structure surface by performing laser processing on a surface of a resin base material
Data Source
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AI summary
Resin molded body (1) includes an uneven structure surface (30) that exhibits liquid repellency by having a plurality of recesses (32) and a plurality of projections (31) alternately arranged in a predetermined direction in a planar form. Each of the projections (31) includes a base portion and a distal end portion that is larger than the base portion.