Heat Shrinkable Polyester Film Low-Temperature Shrinkage
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Solution Overview
Problem
Heat shrinkable polyester films face issues with rapid shrinkage behavior leading to wrinkles and non-uniform shrinkage, requiring high temperatures for shrinkage, which can deform PET containers and cause white-turbidity phenomena, while existing films like PVC and polystyrene have limitations in chemical resistance and storage stability.
Innovation Solution
A heat shrinkable film comprising a polyester-based copolymer with specific diol and dicarboxylic acid residues, including 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexane carboxylate and 4,4-(oxybis(methylene)bis) cyclohexane methanol, which allows for excellent shrinkage rates at low temperatures, similar to PVC, and adjustable shrinkage speed to prevent deformation and white-turbidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polyester film is shrunk at high temperature to achieve sufficient shrinkage rate, then shrinkage rate is improved, but PET container may be deformed and white-turbidity phenomenon is generated
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester film by incorporating specific copolymer components (adipic acid, 1,4-cyclohexane dimethanol, 1,3-propanediol) in controlled ratios. This modifies the film's thermal and shrinkage properties, enabling it to achieve sufficient shrinkage rate at lower temperatures without causing container deformation or white-turbidity phenomena.
2Productivity
If polyester film shrinkage behavior is rapid to achieve good shrinkage characteristics, then shrinkage characteristics are improved, but wrinkles and non-uniform shrinkage are generated
Solution Approach 1:
The patent adjusts the chemical composition parameters by controlling the ratios of copolymer components, particularly using 1,3-propanediol which provides controlled shrinkage rate. This parameter optimization enables the film to shrink uniformly and rapidly without generating wrinkles or non-uniform shrinkage patterns.
3Productivity
If PVC or polystyrene film is used to achieve good shrinkage characteristics at low temperature, then shrinkage characteristics are improved, but chemical resistance is poor and storage stability is insufficient
Solution Approach 1:
The patent creates a composite polyester film by incorporating specific copolymer components (adipic acid, 1,4-cyclohexane dimethanol, 1,3-propanediol) into the polyester matrix. This composite structure combines the low-temperature shrinkage characteristics needed for good shrinkage performance with the chemical resistance and storage stability inherent in polyester materials.
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 shrinkage characteristics at low temperatures, reducing deformation and white-turbidity issues, and allows for easier control of shrinkage speed, thereby decreasing molding defects and enhancing moldability.
Implementation Method 1
a heat shrinkable film comprising a polyester based copolymer, wherein the polyester based copolymer includes: a dicarboxylic acid-derived residue including a residue derived from an aromatic dicarboxylic acid; and a diol-derived residue including a residue derived from 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexane carboxylate
Data Source
AI summary
There is provided a heat shrinkable film comprising a polyester based copolymer capable of having an excellent shrinkage rate and being heat shrunk at a low temperature. The heat shrinkable film according to an exemplary embodiment of the present invention includes a polyester based copolymer, wherein the polyester based copolymer includes: a dicarboxylic acid-derived residue including a residue derived from an aromatic dicarboxylic acid; and a diol-derived residue including a residue derived from 4-(hydroxymethyl)cyclohexylmethyl 4′-(hydroxymethyl)cyclohexane carboxylate represented by the following Chemical Formula 1 and a residue derived from 4,4-(oxybis(methylene)bis) cyclohexane methanol represented by the following Chemical Formula 2.