Polyester Resin Blend for Recyclable Heat-Shrink PET Labels
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Solution Overview
Problem
Conventional polyester films exhibit insufficient heat shrinkage and are not recyclable due to fusion with PET containers during recycling, and existing films like polyvinyl chloride and polystyrene have environmental and chemical resistance issues.
Innovation Solution
A polyester resin blend is developed, incorporating polyethylene terephthalate with diol moieties derived from cyclohexanedimethanol and specific comonomers, enhancing shrinkage properties and transparency, allowing reuse without separation from PET containers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional polyester film is used to improve recyclability by remaining attached to PET containers, then recycling convenience is improved, but heat shrinkage properties are insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester film by incorporating specific comonomers (cyclic carbonate comonomer units) into the polyethylene terephthalate structure. This modifies the polymer chain characteristics to achieve both sufficient heat shrinkage and recyclability, resolving the contradiction between shrinkage performance and recycling convenience
Solution Approach 2:
The patent creates a composite polyester material by combining polyethylene terephthalate with specific comonomer units (cyclic carbonate structures) during polymerization. This composite structure provides enhanced heat shrinkage properties while maintaining the ability to remain attached to PET containers during recycling, simultaneously addressing both requirements
2Illumination intensity
If amorphous polyester film is used to improve transparency, then appearance quality is improved, but fusion with container occurs during recycling making it non-recyclable
Solution Approach 1:
The patent modifies the crystallization parameters of the polyester film through controlled polymerization with cyclic carbonate comonomers. This creates a semi-crystalline structure that maintains transparency while preventing fusion with PET containers during recycling, resolving the contradiction between transparency and recyclability
3Reliability
If polyvinyl chloride film is used to improve heat shrinkage properties, then shrinkage performance is improved, but environmental pollution occurs due to hydrogen chloride gas and dioxin upon incineration
Solution Approach 1:
The patent replaces the environmentally harmful polyvinyl chloride material with a biodegradable and incineration-safe polyester-based material. The new material provides comparable heat shrinkage properties without generating toxic emissions, eliminating environmental pollution while maintaining functional performance
Solution Approach 2:
The patent changes the chemical composition from polyvinyl chloride to polyethylene terephthalate with cyclic carbonate comonomers. This fundamental material substitution maintains heat shrinkage capabilities through controlled polymer structure while eliminating the generation of hydrogen chloride gas and dioxin during incineration
4Stability of the object's composition
If polystyrene film is used to improve working stability during shrinkage, then process stability is improved, but chemical resistance deteriorates requiring specific ink composition for printing
Solution Approach 1:
The patent modifies the chemical structure parameters by incorporating cyclic carbonate comonomer units into the polyester chain. This creates a material with balanced chemical resistance that works with conventional printing inks while maintaining working stability during the shrinkage process, resolving the contradiction between process stability and chemical versatility
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 polyester resin blend provides transparent, heat-shrinkable labels with excellent shrinkage, enabling recycling by remaining attached to PET containers, and improving shrinkage properties of both virgin and recycled PET materials.
Implementation Method 1
A heat shrinkable film has a property of being shrunk when heated
Data Source
AI summary
The present disclosure relates to a polyester resin blend, a polyester film and a preparation method of the same. The polyester resin blend is capable of providing a heat shrinkable label that is transparent and has excellent shrinkage even if it contains recycled polyethylene terephthalate as well as virgin polyethylene terephthalate. In addition, the heat shrinkable label can be reused while attached to a PET container, etc., and is expected to be useful for providing continuously usable plastics that have been recently attracting attention.