Hot Plate Welding With Release Material Pattern
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Solution Overview
Problem
Existing welding techniques for thermoplastic materials require specific dies for specific products, limiting versatility and efficiency in seam formation.
Innovation Solution
A method involving a release material applied to areas where welding is not desired, with planar press plates used to heat and weld thermoplastic films, allowing for the formation of fluid-tight bladders without shaping the material, facilitating high-speed in-line manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If specific dies are used for specific products, then welding precision is improved, but device complexity and versatility deteriorate
Solution Approach 1:
The patent applies universality by using a single planar press plate that can weld multiple different products. The release material pattern on the thermoplastic material determines the weld geometry, not the press plate itself. This allows the same press plate to produce various weld shapes (straight lines, curves, complex patterns) by simply changing the release material application, eliminating the need for multiple product-specific dies.
Solution Approach 2:
The release material serves as an intermediary between the planar press plate and the thermoplastic material. It transfers the desired weld pattern information to the material without requiring the press plate to have complex shaping features. The release material acts as a temporary mold or template that defines where welding should and should not occur.
2Ease of manufacture
If planar press plates are used instead of shaped dies, then versatility and ease of manufacture are improved, but manufacturing precision may deteriorate
Solution Approach 1:
The release material is applied to the thermoplastic material before the welding process. This preliminary action pre-defines the weld pattern and ensures that when the planar press plate applies heat and pressure, the welding occurs precisely only where intended. The release material is positioned and patterned in advance to guide the welding outcome.
Solution Approach 2:
The invention changes the parameter of press plate geometry from shaped/customized to planar/uniform. Instead of varying the physical shape of the welding tool, precision is achieved by varying the parameters of release material application (pattern, location, thickness), which controls where the thermoplastic material melts and bonds during pressing.
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
Enables versatile and efficient welding of thermoplastic films without the need for product-specific dies, achieving fluid-tight seals and accommodating various materials, including polyurethane and polyvinylchloride, while maintaining the ability to avoid sealed areas.
Implementation Method 1
applying a release material to a first film, the release material applied to locations where a weld is not desired; positioning a second film opposite the first film, the release material being positioned between the first film and the second film
Implementation Method 2
applying energy to at least one of the press plates to weld the first film to the second film where the release material is absent
Implementation Method 3
energy applied to the dies to melt the thermoplastic and form welded seams
Implementation Method 4
placing the first film and the second film between planar press plates having planar surfaces and closing the press plates on the first film and the second film
Data Source
AI summary
A method for welding material including: applying a release material to a first film, the release material applied to locations where a weld is not desired; positioning a second film opposite the first film, the release material being positioned between the first film and the second film; placing the first film and the second film between planar press plates having planar surfaces and closing the press plates on the first film and the second film; applying energy to at least one of the press plates to weld the first film to the second film where the release material is absent.