Biodegradable Zipper Tape Yield Strain

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Solution Overview

Problem

Existing technologies using biodegradable resin compositions for zipper tapes face challenges in achieving adequate shape stability and engagement strength.

Innovation Solution

A zipper tape with engagement portions formed from a biodegradable resin composition having a yield strain of 3.4% or more, which improves shape stability and engagement strength, is developed. The tape includes a pair of base strips and engagement portions that are bonded to a container body, enhancing sealing capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a zipper tape is formed of a biodegradable resin composition, then environmental load is reduced, but shape stability and engagement strength deteriorate

Engineering Contradiction:

Improveenvironmental loadVSAvoidengagement strength

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The invention changes the material parameter by specifying a yield strain of 3.4% or more for the biodegradable resin composition. This parameter change enables the resin to maintain adequate engagement strength while preserving biodegradability, thus resolving the contradiction between environmental friendliness and mechanical strength.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a composite resin composition comprising multiple components (polyester resin, polyolefin resin, and other additives) to achieve both biodegradability and sufficient engagement strength. The synergistic effect of the composite materials allows the zipper tape to meet both environmental requirements and mechanical performance standards.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If a zipper tape is formed of a biodegradable resin composition, then environmental load is reduced, but shape stability deteriorates

Engineering Contradiction:

Improveenvironmental loadVSAvoidshape stability

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The invention specifies a yield strain parameter of 3.4% or more for the biodegradable resin composition, which directly addresses shape stability. This parameter ensures that the zipper tape maintains its geometric form under operational stresses while remaining biodegradable, thus resolving the contradiction between environmental friendliness and shape stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The composite resin composition with specifically selected components and ratios provides both biodegradability and shape stability. The combination of polyester resin, polyolefin resin, and additives creates a material system that maintains structural integrity while being environmentally friendly.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS12214932B2Zipper tape and container equipped with zipper tape

Publication Date: 2025.02.04 IDEMITSU UNITECH CO LTD

AI summary

A zipper tape is in an elongated shape and includes, in a cross-sectional shape, a pair of base strips and engagement portions projecting from surfaces facing each other of the pair of respective base strips, the engagement portions being engageable with each other. At least the engagement portions are each formed of a first biodegradable resin composition having a yield strain of 3.4% or more during a tensile test.