Thermo-shrinkable Polyester Film UV Absorber Heat Resistance
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Solution Overview
Problem
Current thermo-shrinkable films, such as PVC and polystyrene, face issues with environmental impact, chemical resistance, and UV sensitivity, leading to spoilage and shortened shelf life of contents, especially when exposed to UV light or high temperatures.
Innovation Solution
A thermo-shrinkable polyester film with a first resin layer comprising polyester resin with aromatic dicarboxylic acid and 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexanecarboxylate, and a second resin layer with a UV absorber, providing excellent UV absorbance and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a film made of polyvinyl chloride is used, then shrinkage performance is good, but it generates hydrogen chloride gas and dioxin-like substances when incinerated, causing environmental problems
Solution Approach 1:
The invention uses a composite structure consisting of a base layer (polyester resin) and a functional layer (containing UV absorber and/or infrared absorber). This composite material approach allows the film to achieve shrinkage performance comparable to PVC while eliminating the harmful emissions through the use of environmentally benign polyester resin as the base material.
2Reliability
If polystyrene-based film is used, then operation stability and appearance are satisfactory, but chemical resistance is poor requiring special ink composition for printing
Solution Approach 1:
The invention changes the chemical composition parameters of the film by using polyester resin instead of polystyrene, and by incorporating UV absorbers and infrared absorbers. This parameter change maintains the operation stability and appearance quality while significantly improving chemical resistance, allowing the use of conventional printing inks without special composition requirements.
3Reliability
If polystyrene-based film is used, then operation stability is good, but storage stability at room temperature is insufficient causing dimensional change such as shrink by itself
Solution Approach 1:
The invention employs a composite material system where polyester resin forms the stable base layer, and UV absorbers/infrared absorbers are incorporated as functional additives. This composite structure provides both operation stability during shrinking processes and storage stability at room temperature, preventing spontaneous dimensional changes while maintaining good shrinkage performance.
4Ease of operation
If a film is attached to a container and then high temperature contents are injected, then packaging function is achieved, but the formed film label may be modified
Solution Approach 1:
The invention modifies the thermal parameters of the film by selecting polyester resin with appropriate glass transition temperature and by adding infrared absorbers. These parameter changes enable the film to maintain its physical and chemical properties at high temperatures, preventing modification or degradation of the film label when hot contents are injected into packaged containers.
5Reliability
If medicines or high functional products are exposed to UV, then contents may be spoiled or shelf life may be shortened, but using a film without UV absorber provides good transparency
Solution Approach 1:
The invention applies local quality by incorporating UV absorbers and/or infrared absorbers specifically in the functional layer, while the base layer maintains its inherent transparency. This localized addition of UV protection functionality provides excellent UV absorbance to protect medicines and high functional products, while the overall film structure preserves adequate transparency for visual inspection and aesthetic purposes.
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 effectively protects contents from UV damage and prevents modification or shrinking when exposed to high temperatures, offering improved chemical resistance and environmental sustainability.
Implementation Method 1
a second resin layer comprising the polyester resin and a UV absorber, formed on at least one side of the first layer
Implementation Method 2
a first resin layer comprising polyester resin comprising residues of dicarboxylic acid components comprising aromatic dicarboxylic acid, and residues of diol components comprising 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexanecarboxylate, and 4,4-(oxybis(methylene)bis)cyclohexane methanol
Data Source
AI summary
This disclosure relates to a thermo-shrinkable polyester film with excellent UV absorbance and heat resistance. According to one embodiment of the invention, provided is a thermo-shrinkable polyester film comprising a first resin layer comprising polyester resin comprising residues of dicarboxylic acid components comprising aromatic dicarboxylic acid, and residues of diol components comprising 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexanecarboxylate, and 4,4-(oxybis(methylene)bis)cyclohexane methanol; and a second resin layer comprising the polyester resin and a UV absorber, formed on at least one side of the first layer.