Detachable Laminate Primer Structure for Humidity-Stable Barrier Packaging

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing laminates using plastic films for packaging face issues with insufficient gas barrier properties at high temperature and high humidity, and there is a need to separate printed layers from resin and sealant layers effectively for recycling.

Innovation Solution

A laminate structure comprising a resin base layer, two release primer layers, and a printed and sealant layer, where at least one release primer layer is formed with an ethylene vinyl alcohol-based resin, allowing for separation using a release solution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a resin layer containing polyvinyl alcohol is used as a release layer, then the printed layer and resin base layer can be separated, but gas barrier properties are reduced at high temperature and high humidity

Engineering Contradiction:

Improveseparation of printed layer and resin base layerVSAvoidgas barrier properties at high temperature and high humidity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The laminate is divided into multiple functional layers: a resin base layer, a printed layer, and two release primer layers positioned between them. This segmentation allows each layer to perform its specific function independently, with the release primer layers enabling separation while the resin base layer and printed layer maintain gas barrier properties.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Release primer layers are introduced as intermediary layers between the resin base layer and the printed layer. These primer layers act as mediators that facilitate separation when needed while not interfering with the gas barrier properties of the main structure. The primer layers can be selectively removed using a release solution, allowing the printed layer and resin base layer to be separated for recycling.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If release ink compositions, release adhesives, or release anchor coating agents are used, then the plastic base can be separated from the laminate, but barrier properties are insufficient

Engineering Contradiction:

Improveseparation of plastic base and laminateVSAvoidbarrier properties

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The laminate uses a composite structure combining a resin base layer with release primer layers made of specific polymer compositions. This composite material approach allows the structure to exhibit both good gas barrier properties from the resin base layer and easy separability from the release primer layers, resolving the contradiction between barrier performance and separation ease.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP4703137A1Laminate having detachment primer composition layer and detachment method for laminate

Publication Date: 2026.03.04 SAKATA INX

AI summary

It is an object to ensure bonding between a resin base layer and a printed layer during use, to provide good barrier properties at high temperature and high humidity, to allow the printed layer to be released from the resin base layer easily after use, and to allow the released printed layer to be separated from the release solution easily. To achieve the object, a laminate including, laminated together, a resin base layer, a release primer layer, a printed layer, another release primer layer, and a sealant layer is provided. At least one of the two release primer layers is a layer formed of a release primer composition containing an ethylene vinyl alcohol-based resin.