Copolymerized Polyester Film Moldability Adhesion
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Solution Overview
Problem
Polyester films used for metal plates face challenges with stress deformation during molding, leading to delamination and limited shape diversity, and have issues with heat shrinkage and processing stability, which affect their moldability and aesthetic appearance.
Innovation Solution
A copolymerized polyester film with specific tensile modulus, heat shrinkage, and melting point ranges, incorporating neopentyl glycol as a copolymerized component, is developed to enhance moldability and processing stability, allowing for curved shapes without delamination and maintaining aesthetic appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyester film is stacked onto a metal plate for surface protection and decoration, then the metal plate achieves excellent surface property and design property, but the polyester film generates stress during molding that causes delamination from the metal plate body
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester film by incorporating specific copolymerized components (cyclic carbonate and carboxylic acid) in controlled amounts. This modifies the film's stress characteristics and adhesion properties, allowing it to maintain strong bonding to the metal plate while withstanding molding stresses without delamination.
Solution Approach 2:
The patent creates a composite polyester film system by combining multiple components: cyclic carbonate (1-10 mol%), carboxylic acid (1-10 mol%), and base polyester resin. This composite structure provides both the adhesion needed for reliable bonding to metal plates and the stress resistance required for successful molding without delamination.
2Adaptability or versatility
If the polyester film is molded with various curves to match diversified design requirements, then the metal plate achieves various curved shapes, but the polyester film experiences excitation phenomenon that causes delamination
Solution Approach 1:
The patent modifies the polyester film's molecular structure parameters by adding cyclic carbonate and carboxylic acid components, which change the film's flexibility and stress distribution characteristics. This enables the film to adapt to various curved shapes and molding configurations while maintaining adhesion and preventing excitation-induced delamination.
3Ease of manufacture
If a vinyl chloride film is used instead of polyester film for stacking onto metal plate, then molding with curves is easier, but the surface property and design property requirements are not met
Solution Approach 1:
The patent adjusts the chemical composition parameters of the polyester film to achieve a balance between moldability and surface quality. By incorporating cyclic carbonate and carboxylic acid in specific amounts, the film gains improved flexibility for molding while the polyester base material maintains its excellent surface properties and design capabilities, surpassing vinyl chloride film performance.
4Strength
If the polyester film has high resistance to deformation, then the metal plate maintains structural integrity, but the moldability for various designs is reduced
Solution Approach 1:
The patent optimizes the composition parameters of the polyester film by incorporating cyclic carbonate and carboxylic acid components, which modify the polymer chain flexibility and intermolecular forces. This creates a balanced material that maintains sufficient structural strength and resistance to deformation while achieving improved moldability for diverse design applications.
Data Source
AI summary
Provided are a polyester film that is usable for protecting a surface of a metal plate of a construction material, a decorative material, an interior material, an electronic product, etc., and a manufacturing method therefor, and a polyester mold product using the same and a manufacturing method therefor, wherein the polyester film has low orientation and low modulus to have excellent moldability.