Slide Fastener Stopper Recesses for Adhesion-Free Painting
Solution Overview
Problem
Existing slide fastener stoppers often adhere to each other during the painting process due to overlapping, leading to defects and uncoated portions, which affect their functionality and appearance.
Innovation Solution
The stoppers feature a recess on the inner surface of each leg, with a specific depth-to-thickness ratio of 3.8% to 18.9%, reducing the adhesion area when stoppers overlap, and ensuring the recess does not visibly impact the stopper's appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stoppers are coated by spraying while housed in a rotating barrel container, then coating efficiency is improved, but mutual adhesion between stoppers occurs due to overlapping
Solution Approach 1:
The harmful contact portions are extracted by forming recesses on the inner surfaces of the legs, removing the areas where adhesion occurs while preserving the functional surfaces for coating
Solution Approach 2:
Different parts of the stopper are given different properties: the inner surfaces of the legs have recesses to prevent adhesion, while the outer surfaces maintain full coating coverage for functionality and appearance
2Reliability
If the recess depth is increased to reduce adhesion area, then adhesion between stoppers is reduced, but the appearance of the stopper is spoiled due to visible convex dents
Solution Approach 1:
The depth of the recess is precisely controlled within the range of 3.8% to 18.9% of the leg thickness, optimizing the balance between adhesion prevention and appearance maintenance through parameter optimization
3Manufacturing precision
If stoppers overlap during painting process, then coating coverage is improved, but uncoated portions occur due to peeling of adhesion
Solution Approach 1:
The recesses extract and remove the contact areas where peeling and uncoated portions occur, allowing the coating process to proceed without creating defects in overlapping regions
Data Source
AI summary
Provided is a stopper for a slide fastener and a method for manufacturing a stopper for a slide fastener, which can reduce mutual adhesion and defective rates during the painting process. A coated metal stopper for a slide fastener is provided. The stopper includes a head and a pair of legs extending from the head in a bifurcated manner. Each of the legs has a recess in the center on its inner surface. The ratio of the depth of the recess to the thickness of each leg of the stopper is 3.8% or more and 18.9% or less. Further, the ratio of the length of the recess in a longitudinal direction of the stopper to the length of the stopper in the longitudinal direction can be 13.5% or more and 23.5% or less.