Textured Polyamide XD Films for Breakage-Free Winding
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Solution Overview
Problem
Thin single-layer polyamide XD films with a thickness of 30 μm or less are prone to breakage due to low elongation and high flexural modulus, making them difficult to produce and process, and existing methods to improve stability, such as adding inorganic particles, further reduce elongation and increase breakage.
Innovation Solution
Texturing the surface of xylylenediamine-based polyamide resin films immediately after extrusion with rolls having a specific surface roughness (Ra) of 0.01 to 1 μm to reduce friction and stress during processing, allowing for continuous production and improved post-processing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic particles are added to reduce adhesion between films, then stability during molding is improved, but elongation is further reduced and breakage increases
Solution Approach 1:
The invention changes the surface parameters of the film by creating a textured surface with specific roughness (Ra 0.03-0.5 μm) instead of adding inorganic particles. This surface texturing reduces friction and adhesion between film layers during winding while maintaining the bulk material's elongation properties. The textured surface creates air gaps and reduces contact area between film surfaces, achieving stability during molding without compromising elongation.
2Productivity
If thin single layer polyamide XD film is prepared with thickness of 30 μm or less, then productivity and commercial value are improved, but breakage during production occurs due to low elongation and high flexural modulus
Solution Approach 1:
The invention applies surface texturing with controlled roughness (Ra 0.03-0.5 μm) to thin polyamide XD films, which reduces inter-layer friction and adhesion forces during the winding process. This allows thin films (30 μm or less) to be produced continuously without breakage, as the textured surface prevents excessive stress concentration and reduces the force required to wind the film onto rolls.
3Productivity
If thin film is taken up in rolls, then commercial value is improved, but wrinkles occur due to frictional resistance between film surfaces
Solution Approach 1:
The invention modifies the surface parameters of the film by creating a textured surface with specific roughness (Ra 0.03-0.5 μm). This surface texturing reduces the frictional resistance between film surfaces during the winding process, allowing films to be taken up in rolls smoothly without wrinkles. The textured surface creates micro-air gaps and reduces contact area, minimizing friction and preventing wrinkle formation.
4Ease of manufacture
If inorganic particles are incorporated to improve molding stability, then ease of manufacture is improved, but uniform dispersion becomes difficult
Solution Approach 1:
The invention extracts the inorganic particles from the system and replaces them with a surface texturing approach. Instead of incorporating inorganic particles into the film bulk to improve molding stability, the invention creates a textured surface structure that achieves the same effect of reducing adhesion and improving handling, while avoiding the dispersion and uniformity problems associated with particle incorporation.
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 textured films can be wound into rolls without breakage, enhancing their processability and commercial value by preventing wrinkles and allowing for lamination with other materials, such as polypropylene or fibers, for use in retort-resistant packaging and composite molded materials.
Implementation Method 1
texturing the surface of xylylenediamine-based polyamide resin films immediately after extrusion with rolls having a specific surface roughness (Ra) of 0.01 to 1 μm to reduce friction and stress during processing
Data Source
AI summary
Provided is a windable thin single layer film comprising a xylylenediamine-based polyamide resin.A polyamide resin film comprising a polyamide resin (C) obtained by polycondensing a diamine structural unit of which 70 mol % or more is derived from xylylenediamine (A) with a dicarboxylic acid (B), wherein the film has a thickness of 10 to 50 μm and is textured on the surface.