EVOH Release Primer Laminate for Barrier Packaging Debonding
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Solution Overview
Problem
Existing packaging materials face issues with insufficient gas barrier properties at high temperature and high humidity, and there is a need for effective methods to separate printed layers from resin base layers for recycling.
Innovation Solution
A laminate structure comprising a resin base layer, a release primer layer containing ethylene vinyl alcohol-based resin, and a printed layer, with specific ethylene content and saponification degree, allows for easy separation using a release solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a resin layer containing polyvinyl alcohol is used as a release layer, then the printed layer can be separated from the resin base layer, but gas barrier properties are reduced at high temperature and high humidity
Solution Approach 1:
The patent changes the chemical composition parameters of the release layer by using ethylene vinyl alcohol-based resin with specific ethylene content (1-35 mol%) and saponification degree (90% or more), replacing polyvinyl alcohol. This parameter change maintains the release function while improving gas barrier properties at high temperature and high humidity conditions.
Solution Approach 2:
The patent employs a composite release primer layer containing ethylene vinyl alcohol-based resin with specific compositional parameters. This composite material approach allows the release layer to simultaneously provide separation functionality and maintain superior gas barrier properties compared to single-material polyvinyl alcohol systems.
2Ease of operation
If release ink compositions or release adhesives are used to separate the plastic base from the laminate, then the printed layer can be removed, but barrier properties are insufficient
Solution Approach 1:
The patent specifies precise parameter ranges for the ethylene vinyl alcohol-based resin, including ethylene content of 1-35 mol% and saponification degree of 90% or more. These parameter changes optimize both the release capability and barrier properties, resolving the contradiction between ease of separation and barrier performance.
3Adaptability or versatility
If printing is performed on the surfaces of the base films followed by lamination, then designs and messages can be added, but the complexity of the laminate structure increases
Solution Approach 1:
The patent segments the laminate structure into distinct functional layers: resin base layer, release primer layer with specific compositional parameters, and printed layer. This segmentation allows independent optimization of each layer's function while maintaining overall system versatility for various packaging applications.
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 maintains good barrier properties at high temperature and high humidity, enabling easy separation and recycling of the resin base layer.
Implementation Method 1
the laminate exhibits good barrier properties at high temperature and high humidity
Implementation Method 2
the resin base layer can be easily released from the printed layer using a release solution
Data Source
AI summary
It is an object to achieve good gas barrier properties at high temperature and high humidity, to allow a printed layer to be easily released from a resin base layer after use, and to allow the released printed layer to be easily separated from the release solution. To achieve the object, a laminate including, laminated in sequence, a resin base layer, a release primer layer containing an ethylene vinyl alcohol-based resin, and a printed layer is provided.