Paper Gas-Barrier Laminate for Long-Term Water Vapor Stability

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Solution Overview

Problem

Laminates with a barrier layer on paper exhibit deteriorating water vapor barrier properties over time.

Innovation Solution

A laminate structure comprising a paper substrate with specific pulp proportions and resin layers, including a gas barrier layer, to maintain long-term water vapor barrier properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a barrier layer is laminated on paper to achieve good initial water vapor barrier properties, then the water vapor barrier properties deteriorate after a long period of time

Engineering Contradiction:

Improvewater vapor barrier propertiesVSAvoidtime elapsed after production

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The invention changes the physical parameters of the paper substrate by controlling the pulp fiber dimensions - specifically setting the proportion of pulp with length 0.4-1 mm at 60% or more and pulp with width 10-20 μm at 40% or more. This parameter optimization prevents dimensional changes in the paper over time, thereby maintaining the water vapor barrier properties of the laminated structure throughout its service life.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If paper is used as a packaging material to reduce plastic usage, then the long-term stability of water vapor barrier properties is insufficient

Engineering Contradiction:

Improveenvironmental friendlinessVSAvoidwater vapor barrier stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The invention optimizes the physical parameters of paper fibers (length 0.4-1 mm and width 10-20 μm proportions) to prevent dimensional instability, thereby maintaining water vapor barrier properties over time while preserving the environmental benefits of using paper-based packaging materials.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If the proportion of short pulp fibers is increased to improve paper formation, then the water vapor barrier properties deteriorate over time

Engineering Contradiction:

Improvepaper formation qualityVSAvoidwater vapor barrier properties

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The invention identifies the optimal parameter range for pulp fibers - length of 0.4-1 mm and width of 10-20 μm - that simultaneously achieves good paper formation quality and long-term water vapor barrier stability, avoiding the pitfalls of both too-short and too-long fiber proportions.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The laminate structure effectively suppresses the deterioration of water vapor barrier properties over time, ensuring stability and performance.

Implementation Method 1

the gas barrier layer is an aluminum vapor-deposited layer

Methodology Applied

Scientific EffectPhysical vapor deposition: Physical Vapour Deposition

Data Source

PatentEP4721978A1Laminate and packaging bag

Publication Date: 2026.04.08 TOPPAN HOLDINGS INC

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AI summary

A gas barrier laminate according to an aspect of the present disclosure includes at least a paper substrate, a first resin layer, and a gas barrier layer in this order, in which in the paper substrate, the proportion of pulp having a length of 0.4 mm or more and 1 mm or less is 60% or more, and a proportion of pulp having a width of 10 µm or more and 20 µm or less is 40% or more.