Polyamide Film with Elastomer for Low-Temperature Flex Resistance
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Solution Overview
Problem
Polyamide films lack sufficient flex resistance in low-temperature environments and transparency, making them unsuitable for packaging materials that require both properties, especially for chilled foods and medical containers.
Innovation Solution
A polyamide film composed of a specific polyamide resin composition containing 1-10% by mass of a polyester thermoplastic elastomer, with specific elastic moduli and elastic modulus ratios, and a biaxially stretched structure, which also includes a polyvinylidene chloride resin layer for enhanced adhesion and gas barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyamide resin film is used to ensure mechanical strength and gas barrier properties, then puncture strength and abrasion resistance are improved, but flex resistance in low-temperature environment deteriorates
Solution Approach 1:
The invention uses a composite material system consisting of polyamide resin (60-90 mass%) combined with polyester thermoplastic elastomer (10-40 mass%). The polyester elastomer component provides flexibility and cold flexibility, while the polyamide provides strength and barrier properties. This composite structure resolves the contradiction by combining materials with complementary properties to achieve both high puncture strength and excellent flex resistance at low temperatures.
2Strength
If polyamide resin film is used to ensure mechanical strength, then puncture strength is improved, but transparency deteriorates
Solution Approach 1:
The invention controls the crystallinity and molecular structure parameters of the polyester thermoplastic elastomer to optimize transparency. By selecting specific polyester elastomers with appropriate glass transition temperatures and crystalline structures, the film achieves high transparency while maintaining the mechanical strength provided by the polyamide resin matrix. The parameter optimization of the elastomer component allows simultaneous achievement of strength and optical clarity.
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 exhibits improved flex resistance, reduced pinhole formation, and transparency, making it suitable for packaging materials in low-temperature environments, such as chilled foods and medical containers, while maintaining puncture strength and abrasion resistance.
Implementation Method 1
a polyamide resin composition containing 1 to 10% by mass of a polyester thermoplastic elastomer... excellent in flex resistance in a low-temperature environment
Implementation Method 2
a stretched film including a polyamide resin composition... elastic moduli in MD and TD of the film are each 1.0 to 2.3 GPa; a ratio between the elastic moduli in MD and TD of the film (MD/TD) is 0.9 to 1.5
Data Source
AI summary
Provided is a polyamide film which is a stretched film including a polyamide resin composition containing 1 to 10% by mass of a polyester thermoplastic elastomer, wherein the polyamide film satisfies all of the following conditions (A) to (C): (A) elastic moduli in MD and TD of the film are each 1.0 to 2.3 GPa; (B) a ratio between the elastic moduli in MD and TD of the film (MD/TD) is 0.9 to 1.5; and (C) a haze of the film is 7% or less.