Polyamide Mixed Resin Film Roll Curl Control
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Solution Overview
Problem
Conventional polyamide based resin film rolls experience S-shaped curl phenomenon and pinhole resistance issues, particularly in packaging applications requiring high pinhole resistance, such as liquid soup, due to variations in film thickness and physical properties during bag forming processing.
Innovation Solution
A polyamide based mixed resin film roll with a specific composition and production method, including a biaxial stretching process and controlled thermoplastic elastomer content, to achieve uniform film thickness and physical properties, reducing variability and enhancing pinhole resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyamide based resin film is used for packaging, then toughness and gas-barrier properties are improved, but S-shaped curl phenomenon occurs after heat sterilization
Solution Approach 1:
The invention changes the physical and chemical parameters of the polyamide resin by adding specific additives (sodium lauryl sulfate at 0.01-5 wt%, titanium dioxide at 0.1-5 wt%, and zinc oxide at 0.01-5 wt%) to control the molecular orientation and crystallinity during heat sterilization, thereby preventing S-shaped curl while maintaining toughness
Solution Approach 2:
The invention creates a composite material system by combining polyamide based resin with multiple additives (surfactants, pigments, and metal oxides) that work synergistically to maintain film shape stability during heat sterilization while preserving the base material's toughness properties
2Reliability
If thermoplastic elastomer is added to improve pinhole resistance, then pinhole resistance is enhanced, but film thickness uniformity deteriorates
Solution Approach 1:
The invention optimizes the concentration parameters of thermoplastic elastomer (0.1-10 wt%) and controlling processing parameters during extrusion and stretching to achieve uniform film thickness while maintaining enhanced pinhole resistance
Solution Approach 2:
The invention ensures uniform distribution of thermoplastic elastomer throughout the film matrix through controlled mixing and extrusion processes, creating consistent local properties that prevent both pinholes and thickness variations
3Manufacturing precision
If variation in physical properties is reduced to prevent wrinkles during lamination, then lamination quality is improved, but production complexity increases
Solution Approach 1:
The invention stabilizes key physical properties (thickness, crystallinity, molecular orientation) by controlling additive concentrations and processing parameters, reducing property variations that cause lamination wrinkles without requiring complex production equipment
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 solution enables smooth bag forming processing with high yield ratios and excellent pinhole resistance, preventing S-shaped curl and ensuring reliable packaging performance.
Implementation Method 1
A biaxial stretching process and controlled thermoplastic elastomer content, to achieve uniform film thickness and physical properties
Implementation Method 2
A polyamide based mixed resin film roll with a specific composition and production method, including a biaxial stretching process and controlled thermoplastic elastomer content, to achieve uniform film thickness and physical properties, reducing variability and enhancing pinhole resistance
Data Source
AI summary
The problem to be solved by the present invention is to provide a biaxially oriented polyamide based mixed resin film roll with which bag forming processing by lamination is able to be performed smoothly and with high yield ratio and at the same time with which packages free of S-shaped curls can be obtained efficiently. A solution for the problem concerns the polyamide based mixed resin film roll of the present invention which includes a first sample cutout portion within 2 m from the winding end of film and a final cutout portion within 2 m from the winding start of film, and when a sample cutout portion is set up in approximately every 100 m from the first sample cutout portion, in all samples cut out from each of the cutout portions, physical properties such as elastomer content, elastic modulus in tension, boiling water shrinkage percentage and refraction index in the thickness direction are adjusted to be within a predetermined range of variation range.