Water-Soluble PVA Film Composition for Wrinkle-Free Chemical Packages
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Solution Overview
Problem
Conventional water-soluble films used for individual chemical agent packages, particularly liquid detergents, suffer from poor conformability to molds, leading to packages with wrinkles and distorted shapes, compromising appearance and mechanical integrity.
Innovation Solution
A water-soluble film containing a polyvinyl alcohol resin, a plasticizer, and a filler, with specific ratios and proportions, ensuring excellent conformability to complex molds without impairing tensile strength and elongation, allowing for tensioned packages without distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional water-soluble films are used for individual packages, then the packages can be formed with various shapes and sizes, but the films exhibit poor conformability to molds, resulting in wrinkles and distorted shapes
Solution Approach 1:
The patent applies parameter changes by modifying the plasticizer content (3-22 parts by mass per 100 parts by mass of polyvinyl alcohol resin) and the mass ratio between plasticizer and filler (B)/(C) = 1.5 to 25. These parameter adjustments optimize the film's conformability to molds during forming while maintaining mechanical strength, directly resolving the contradiction between shape conformity and manufacturing precision.
Solution Approach 2:
The patent uses composite materials by combining polyvinyl alcohol resin (A), plasticizer (B), and filler (C) in specific proportions. This composite formulation enhances the film's conformability to complex mold shapes while preserving tensile strength and elongation properties, enabling wrinkle-free packaging with complicated geometries.
2Adaptability or versatility
If the film is formed into deep drawing or complicated shapes, then the package design flexibility is improved, but the film tension is lost and appearance quality deteriorates
Solution Approach 1:
The patent employs parameter changes by optimizing the plasticizer proportion (3-22 parts by mass per 100 parts by mass of resin A) and the plasticizer-to-filler mass ratio (B)/(C) = 1.5 to 25. These parameter adjustments enable the film to maintain adequate tension and mechanical properties even when formed into deep drawing or complicated shapes, preserving both design flexibility and strength.
3Ease of operation
If the plasticizer proportion is increased to improve conformability, then the film's flexibility is enhanced, but the mechanical strength may be impaired
Solution Approach 1:
The patent applies parameter changes by precisely controlling the plasticizer content within 3-22 parts by mass per 100 parts by mass of resin A and maintaining the mass ratio (B)/(C) between 1.5 to 25. This optimized parameter range provides sufficient flexibility for mold conformability while preserving adequate tensile strength and elongation, preventing mechanical property impairment.
Data Source
AI summary
A water-soluble polyvinyl alcohol film with excellent conformability to a mold during forming and capable of being formed into a package with excellent appearance is provided. A water-soluble film includes a polyvinyl alcohol resin (A), a plasticizer (B), and a filler (C). The plasticizer (B) is present in a proportion of 3 to 22 parts by mass per 100 parts by mass of the polyvinyl alcohol resin (A), and a mass ratio (B)/(C) between the plasticizer (B) and the filler (C) is 1.5 to 25.