Fluorine-Resin Laminate Structure for Clear Moisture-Barrier Packaging

Solution Overview

Problem

Existing laminates with fluorine-based resin films for packaging materials face issues with high water vapor permeability and reduced visibility, particularly in press-through packages for pharmaceuticals.

Innovation Solution

A laminate structure comprising a substrate layer, an intermediate layer, and a fluorine-based resin layer, with specific resin compositions and thicknesses, ensuring a total light transmittance of 85% or more and a haze value of 35% or less, thereby improving both barrier properties and visibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fluorine-based resin film is used to improve water vapor barrier properties, then water vapor permeability is reduced, but visibility is deteriorated

Engineering Contradiction:

Improvewater vapor barrier propertiesVSAvoidvisibility

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The laminate is divided into multiple functional layers: a substrate layer providing mechanical strength, an intermediate layer controlling optical properties, and a fluorine-based resin layer providing water vapor barrier. This segmentation allows each layer to optimize its specific function without compromising others.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses a composite laminate structure combining different materials (substrate material, intermediate layer material, and fluorine-based resin) to achieve properties that individual materials cannot provide alone, specifically combining barrier performance with good visibility.

Inventive Principle:

Principle #40Composite materials

2Reliability

If the fluorine-based resin layer thickness is increased to improve barrier properties, then water vapor permeability is reduced, but total light transmittance is reduced and haze value is increased

Engineering Contradiction:

Improvewater vapor barrier propertiesVSAvoidtotal light transmittance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The invention optimizes the thickness parameter of the fluorine-based resin layer to a specific range (5 μm to 50 μm) that provides sufficient water vapor barrier properties while maintaining acceptable visibility. This parameter optimization balances barrier performance with optical properties.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The intermediate layer is designed with specific optical properties (total light transmittance of 90% or more and haze value of 5% or less) to compensate for the optical limitations of the fluorine-based resin layer, ensuring overall good visibility while maintaining barrier performance.

Inventive Principle:

Principle #3Local quality

3Reliability

If the fluorine-based resin layer thickness is increased to improve barrier properties, then water vapor permeability is reduced, but haze value is increased

Engineering Contradiction:

Improvewater vapor barrier propertiesVSAvoidhaze value

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The invention optimizes the thickness parameter of the fluorine-based resin layer to a specific range (5 μm to 50 μm) that provides sufficient water vapor barrier properties while maintaining acceptable visibility. This parameter optimization balances barrier performance with optical properties.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The intermediate layer is designed with specific optical properties (total light transmittance of 90% or more and haze value of 5% or less) to compensate for the optical limitations of the fluorine-based resin layer, ensuring overall good visibility while maintaining barrier performance.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12496814B2Laminate, blister container, and push-through package

Publication Date: 2025.12.16 ZACROS CORP

AI summary

A laminate has a substrate layer, an intermediate layer, and a fluorine-based resin layer in this order, in which a total light transmittance of the laminate is 85% or more and a haze value of the laminate is 35% or less.