Multilayer Stretched Base Material for High-Barrier Packaging
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Solution Overview
Problem
Oriented polypropylene films lack high gas barrier properties, necessitating improved packaging materials for containing specific contents.
Innovation Solution
A polyolefin-based stretched base material comprising a first surface resin layer with a gas barrier resin, a polyolefin intermediate layer, and a second surface resin layer with a gas barrier resin, enhancing gas barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If oriented polypropylene films are used as base materials, then strength and heat resistance are improved, but gas barrier properties deteriorate
Solution Approach 1:
The patent applies composite materials by creating a multilayer structure combining polyolefin base material with gas barrier resin layers. Specifically, it uses a three-layer configuration where a polyolefin intermediate layer (providing strength and heat resistance) is sandwiched between two gas barrier resin layers (providing gas barrier properties). This composite structure allows the material to simultaneously achieve both mechanical strength and effective gas barrier performance, resolving the contradiction between these two properties.
Solution Approach 2:
The patent applies segmentation by dividing the base material into distinct functional layers. Instead of using a single homogeneous polypropylene film, it segments the structure into: (1) gas barrier resin layers that specifically block gas permeation, and (2) polyolefin intermediate layers that provide structural strength and heat resistance. Each layer performs its specific function, and the combination achieves both strength and gas barrier properties that neither material could provide alone.
2Object-affected harmful factors
If gas barrier resin layers are added to improve gas barrier properties, then barrier performance is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by concentrating gas barrier functionality specifically in the surface resin layers while maintaining the bulk polyolefin layer for structural support. The gas barrier resin is locally applied where it is most needed (at the surfaces in contact with contents and external environment), rather than throughout the entire material. This localized approach achieves effective gas barrier properties without requiring complete structural redesign, thus limiting the increase in complexity.
Data Source
Figure 1A~2B
Figure 2C~2E
Figure 3A~3C
AI summary
A stretched base material includes at least a first surface resin layer containing at least one gas barrier resin as its main component, at least one polyolefin intermediate layer containing a polyolefin as its main component, and a second surface resin layer containing at least one gas barrier resin as its main component in this order.