Multilayer Bag Fitting Structure to Suppress Peeling and Curling
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Solution Overview
Problem
Existing fitting tools experience interlayer peeling and curling issues, which hinder their effective adhesion to bag bodies, particularly during the bag-making process.
Innovation Solution
A fitting tool with a multilayer structure comprising a male and female side fitting members, each having a specific resin composition and thickness relationship, along with controlled curl angles and terminal positions, to minimize interlayer peeling and curling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a base material including a resin layer having high hardness is used, then the occurrence of wrinkles and deterioration of appearance during bag making is suppressed, but interlayer peeling occurs and curling happens after molding
Solution Approach 1:
The patent applies composite materials by creating a three-layer structure where the base material comprises a resin layer, a paper layer, and a release treatment layer. This composite structure combines the rigidity and appearance quality of the resin layer with the flexibility and adhesion properties of the paper layer, preventing both wrinkles and interlayer peeling simultaneously
Solution Approach 2:
The patent applies parameter changes by controlling the thickness ratio between the resin layer and paper layer, where the resin layer thickness is 1 μm to 10 μm and the paper layer thickness is 10 μm to 50 μm. This specific parameter range optimizes the balance between appearance quality and interlayer adhesion, preventing both wrinkles and peeling
2Reliability
If a multilayer structure is used to suppress interlayer peeling, then adhesion stability improves, but curling occurs after molding making adhesion difficult
Solution Approach 1:
The patent applies local quality by providing different functional characteristics to different layers: the resin layer provides local rigidity and appearance quality at the surface, while the paper layer provides local flexibility and curling resistance in the bulk. This localized functional distribution achieves both adhesion stability and shape stability
Solution Approach 2:
The patent applies an intermediary approach by introducing a release treatment layer between the resin layer and the bag body. This intermediary layer with controlled adhesion strength (0.01 N/mm to 0.1 N/mm) prevents excessive adhesion that causes curling while maintaining sufficient adhesion stability for reliable attachment
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 solution effectively suppresses interlayer peeling and curling, ensuring stable adhesion to bag bodies, enhancing the appearance and functionality of the fitting-tool-equipped bag body.
Implementation Method 1
A melting point TA (° C.) of the main layer, a melting point TB (° C.) of the interlayer, and a melting point TC (° C.) of the seal layer satisfy a relationship of TB>TA>TC
Data Source
AI summary
An object of the present invention is to provide a fitting tool in which interlayer peeling is less likely to occur and the occurrence of curling is suppressed, and a fitting-tool-equipped bag body using the fitting tool. In a fitting tool including a male side fitting member in which a male side fitting portion is provided on a band-shaped first base material, and a female side fitting member in which a female side fitting portion is provided on a band-shaped second base material, each of the first base material and the second base material includes a main layer, an interlayer, and a seal layer laminated from a fitting portion side, and satisfies that (1) the main layer, the interlayer, and the seal layer contain at least one kind of same type of resin, (2) a melting point TA (° C.) of the main layer, a melting point TB (° C.) of the interlayer, and a melting point TC (° C.) of the seal layer satisfy a relationship of TB>TA>TC, and (3) a thickness tA (μm) of the main layer, a thickness tB (μm) of the interlayer, and a thickness tC of the seal layer satisfy a relationship of tB>tA>tC.