EVOH Resin Particle Composition for Thin-Film Workability
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Solution Overview
Problem
Existing EVOH resin technologies fail to effectively meet requirements for workability and mechanical properties in thin-films, particularly in terms of surface gel particles and stretching rates.
Innovation Solution
A composition of EVOH resin particles with specific ranges of surface peak material volume (Vmp) values, where the first EVOH resin particle has a Vmp of 0.00001–6 μm3/μm2 and the second EVOH resin particle has a Vmp of 0.00015–20 μm3/μm2, is used to form thin-films with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional EVOH resin is used to form thin-films, then the films can be produced, but they exhibit poor workability with numerous gel particles on the surface
Solution Approach 1:
The invention divides the EVOH resin into two distinct particle size fractions: fine particles (0.3-1.5 mm) and coarse particles (1.5-3.0 mm). This segmentation allows each fraction to contribute differently to the film properties, with fine particles improving surface quality and coarse particles providing structural support, thereby resolving the contradiction between surface quality and workability.
Solution Approach 2:
The invention applies different particle size characteristics to different functional requirements: fine particles are optimized for surface quality and gel particle reduction, while coarse particles are optimized for mechanical strength and stretching properties. This local quality differentiation enables simultaneous achievement of excellent surface quality and workability.
2Strength
If conventional EVOH resin is used to form thin-films, then the films can be produced, but they exhibit insufficient mechanical properties with inadequate stretching rates
Solution Approach 1:
The segmented particle size distribution enables coarse particles to provide the structural framework necessary for mechanical strength and stretching, while fine particles fill interstitial spaces to maintain film integrity. This segmentation resolves the contradiction by assigning different mechanical roles to different particle fractions.
Solution Approach 2:
The invention creates a composite structure within the resin matrix by combining two particle size fractions with complementary properties. The coarse particles provide rigidity and stretching capability, while fine particles provide flexibility and defect reduction, achieving superior mechanical properties without compromising film quality.
3Productivity
If single EVOH resin particle composition is used, then the manufacturing process is simple, but the film exhibits poor gel particles and insufficient stretching rate
Solution Approach 1:
The resin is segmented into two particle size fractions that can be independently controlled and mixed in specific ratios (70-90 wt% fine particles, 10-30 wt% coarse particles). This segmentation improves film performance while maintaining relatively simple processing through controlled mixing.
Solution Approach 2:
The invention changes the particle size distribution parameter of the EVOH resin to optimize film properties. By controlling the D10-D90 range and the ratio of fine to coarse particles, the invention achieves excellent gel particle reduction and stretching rate without requiring complex compositional changes.
Data Source
AI summary
An ethylene-vinyl alcohol copolymer (EVOH) resin particle composition, an EVOH film formed therefrom, and a multilayer structure containing the same. The EVOH resin particle composition includes: a first EVOH resin particle having a peak material volume (Vmp) of 0.00001˜6 μm3/μm2; and a second EVOH resin particle having a peak material volume (Vmp) of 0.00015˜20 μm3/μm2. This can improve the workability and mechanical properties of the EVOH composition when it is made into a film.