Recyclable Polyester Heat Shrink Film for PET Bottles
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Solution Overview
Problem
The existing recycling process for PETG heat shrinkable films is inefficient due to differences in melting points and crystallinities with PET bottle chips, leading to adhesion and bridging issues in recycling equipment, increased costs, and reduced recycling efficiency.
Innovation Solution
A crystalline and easily recyclable polyester heat shrinkable film is developed with a three-layer structure, incorporating a foaming agent, chain extender, and nucleating agent to improve melting point, crystallinity, and shrinkage rate, while maintaining printability and adhesivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the melting point of PETG film is increased to improve recyclability with PET bottles, then the film becomes more compatible with PET recycling processes, but the shrinkability of the film decreases, failing to meet packaging requirements
Solution Approach 1:
The patent applies parameter changes by carefully adjusting the composition ratios of PETG, PET, and functional master batch in the film formulation. By optimizing these parameters, the film achieves a balanced melting point that enables PET recycling compatibility while preserving sufficient shrinkability for packaging applications.
Solution Approach 2:
The patent uses composite materials by combining PETG with PET and functional master batch to create a multi-component film system. This composite approach allows the film to inherit recyclability from PET while maintaining the shrinkability characteristics needed for effective packaging.
2Reliability
If manual separation of polyester labels from bottles is performed to improve recycling purity, then the quality of recycled PET is improved, but the cost and time consumption increase significantly
Solution Approach 1:
The patent merges the recycling process by formulating the film to be compatible with PET recycling streams, eliminating the need for separate manual sorting. The film and bottle chips can be recycled together through automated processes, reducing both time and cost while maintaining recycling quality.
3Productivity
If conventional polyester heat shrinkable film is used in PET recycling at temperatures above 200°C, then the recycling process can proceed, but the film softens and becomes sticky, forming lumps that block equipment
Solution Approach 1:
The patent applies parameter changes by adjusting the film's thermal properties through optimized composition. The film is formulated to maintain structural integrity and prevent sticking at recycling temperatures above 200°C, eliminating lump formation and equipment blocking while allowing efficient recycling processing.
4Reliability
If the synthesis process of the film is modified to improve crystallinity and melting point, then the film becomes more recyclable, but the process complexity and energy consumption increase
Solution Approach 1:
The patent applies parameter changes by optimizing the synthesis process through adjusted composition ratios of PETG, PET, and functional master batch. This approach improves crystallinity and melting point to enhance recyclability while avoiding excessive process complexity and energy consumption by working within existing manufacturing frameworks.
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 film achieves improved recyclability, thermal stability, and reduced shrinkage force, preventing adhesion and bridging in recycling processes, thus enhancing recycling efficiency and product applicability.
Implementation Method 1
incorporating a foaming agent, chain extender, and nucleating agent to improve melting point, crystallinity, and shrinkage rate
Implementation Method 2
incorporating a foaming agent, chain extender, and nucleating agent to improve melting point, crystallinity, and shrinkage rate
Implementation Method 3
incorporating a foaming agent, chain extender, and nucleating agent to improve melting point, crystallinity, and shrinkage rate
Implementation Method 4
improving the shrinkage rate of the film by combining a porous structure combined with the process
Data Source
AI summary
Provided are a crystalline and easily recyclable polyester heat shrinkable film, having a three-layer structure of layer A/layer B/layer C, in which the layer A is prepared by raw materials consisting of polyethylene terephthalate glycol copolymer (PETG), a functional master batch and polyethylene terephthalate (PET), the layer B is prepared by raw materials consisting of a modified PET, PET, a nucleating agent, a chain extender, and a foaming agent.