Lactic Acid Resin Card Core with Polyester Layers
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Solution Overview
Problem
Existing information-recording cards, particularly those using lactic acid series polymers, face issues with heat resistance, impact resistance, and adhesiveness between layers, limiting their suitability for durable applications like membership, ID, credit, and IC cards.
Innovation Solution
A core sheet for cards is developed using a lactic acid series resin layer combined with an aromatic polyester series resin or polycarbonate series resin, along with a mixed resin, to create a layered card structure that enhances heat resistance, impact resistance, and adhesiveness, utilizing 20-80% plant raw material plastic for environmental sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lactic acid series polymer is used as main raw material, then environmental sustainability is improved, but heat resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining lactic acid series polymer with aromatic polyester series resin or polycarbonate series resin in a layered structure. The lactic acid series polymer layer provides environmental sustainability, while the aromatic polyester or polycarbonate layers provide the necessary heat resistance, thus resolving the contradiction between environmental friendliness and thermal performance.
2Object-affected harmful factors
If lactic acid series polymer is used as main raw material, then environmental sustainability is improved, but impact resistance deteriorates
Solution Approach 1:
The patent uses composite materials by creating a layered card where lactic acid series polymer layers are combined with aromatic polyester series resin layers or polycarbonate series resin layers. The aromatic polyester or polycarbonate components provide enhanced impact resistance, while the lactic acid series polymer maintains environmental sustainability, thus resolving the contradiction between eco-friendliness and mechanical strength.
3Object-affected harmful factors
If lactic acid series polymer is used as main raw material, then environmental sustainability is improved, but adhesiveness between layers deteriorates
Solution Approach 1:
The patent applies composite materials by forming a layered card structure where lactic acid series polymer layers are combined with aromatic polyester series resin layers or polycarbonate series resin layers. The specific combination and arrangement of these materials provide improved adhesiveness between layers through heat fuse-bonding, while maintaining the environmental benefits of using plant-derived plastics.
4Object-affected harmful factors
If plant raw material plastic usage is increased, then environmental sustainability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the card into multiple functional layers, with lactic acid series polymer layers providing environmental sustainability and aromatic polyester or polycarbonate layers providing performance characteristics. This segmented approach allows each layer to be optimized independently while simplifying the overall manufacturing process through standardized layering and heat fuse-bonding techniques.
Data Source
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AI summary
In relation to a core sheet for card for forming an environment-reactive layered card having a plant raw material plastic as a main raw material, a core sheet for card for forming a novel layered card having excellent heat resistance, impact resistance, as well as adhesiveness between each layer (heat fuse-bonding ability), is provided. A core sheet for card is proposed, which is a core sheet for card (A) to be used together with an over-sheet (B) provided with a structure in which at least one layer is a layer having as a main component resin an aromatic polyester series resin or a polycarbonate series resin or a mixed resin of these both for the purpose of forming a layered card, comprising one layer or two or more layers that are layered, among which at least one layer is a lactic acid series resin layer having a lactic acid series polymer as a main component resin.