Multilayer Laminated Package with Segmented Tear Strength
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Solution Overview
Problem
Conventional flexible packaging solutions fail to achieve a balance between easy cuttability, straight cuttability, heat resistance, high seal strength, and drop impact resistance, leading to difficulties in removing contents cleanly and safely.
Innovation Solution
A multilayer laminate package structure comprising a base layer and a sealant layer, where the sealant layer is made of polypropylene-based resin, stretched uniaxially, and includes ethylene-propylene block copolymers, ethylene-propylene random copolymers, or ethylene-propylene rubber, with specific thickness and composition to enhance tear strength, seal strength, and drop impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional laminated films are used for packaging, then heat resistance and seal strength can be achieved, but cuttability deteriorates (cutting path veers or opening too small)
Solution Approach 1:
The packaging film is divided into multiple functional layers with distinct properties: a first outer layer (5-20 μm) optimized for cuttability, a second outer layer (20-50 μm) for heat resistance and strength, and an inner layer for sealability. This segmentation allows each layer to contribute its specific function without compromising the others.
Solution Approach 2:
Different regions of the packaging structure are assigned different material properties: the first outer layer has low tear strength for easy cutting, while the second outer layer and inner layer have high tear strength for maintaining package integrity during heat treatment and sealing operations.
2Ease of operation
If package structure is optimized for easy cuttability, then cutting ease improves, but seal strength deteriorates
Solution Approach 1:
The film structure is segmented into three layers where the inner layer (10-30 μm) is specifically designed for high seal strength, while the first outer layer (5-20 μm) is designed for easy cuttability. This prevents the compromise between cuttability and seal strength.
Solution Approach 2:
The inner layer is assigned the specific function of providing high seal strength at the sealing region, while the first outer layer provides easy cuttability at the opening region, allowing both properties to coexist in different locations of the same packaging structure.
3Ease of manufacture
If conventional films are used, then manufacturing simplicity is maintained, but drop impact resistance deteriorates
Solution Approach 1:
The packaging uses a composite structure of three different film layers with distinct properties: the first outer layer for cuttability, the second outer layer for heat resistance, and the inner layer for seal strength and drop impact resistance. This composite approach enhances overall performance while remaining compatible with conventional manufacturing processes.
Data Source
AI summary
There is provided an easily opened multilayer laminated package suitable for the field of flexible packaging, which has easy cuttability, heat resistance, high seal strength and drop impact resistance.A package to be used as a multilayer package, comprising a multilayer laminate body composed of a base layer and a sealant layer, wherein the value of the tear strength measured according to JIS K7128-2, when substituted into the formula (TD value)/(MD value), is such that (TD value)/(MD value)=1.5 or greater, and the value of the tear strength of the film used in the sealant layer is such that (TD value)/(MD value)=3 or greater.