Packaging Material Primer Layer for Image Quality and Strength
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Solution Overview
Problem
Conventional packaging materials using oriented or cast polypropylene films, polyester films, or polypropylene films with inorganic oxide-deposited layers fail to achieve excellent printed image quality, laminate strength, and heat sealability, leading to issues like film separation during food packing, transportation, and display.
Innovation Solution
A packaging material structure comprising a base film, a primer layer formed with a water-soluble polyvalent metal salt, chlorinated polyolefin emulsion, and acrylic or vinyl acetate emulsion, a printed layer with a polyester polyurethane resin, and an adhesive layer with an aliphatic ester adhesive, which enhances image quality, laminate strength, and heat sealability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If oriented or cast polypropylene films, polyester films, or polypropylene films with inorganic oxide-deposited layers are used as base film or sealant film, then gas barrier properties and laminate strength are improved, but printed image quality deteriorates
Solution Approach 1:
The patent divides the packaging material into multiple functional layers: base film, primer layer, printed layer, adhesive layer, and sealant film. This segmentation allows each layer to specialize in specific functions - the base film and sealant film provide strength and gas barrier properties, while the printed layer with aqueous inkjet ink ensures excellent printed image quality without compromising the overall laminate strength
Solution Approach 2:
The patent introduces a primer layer as an intermediary between the base film and the printed layer. This primer layer serves as a mediator that enhances the adhesion and compatibility between the base film and the printed layer, allowing the printed layer to achieve excellent printed image quality while maintaining strong bonding to the base film, thus resolving the contradiction between printed image quality and laminate strength
2Strength
If oriented or cast polypropylene films, polyester films, or polypropylene films with inorganic oxide-deposited layers are used as base film or sealant film, then gas barrier properties are improved, but heat sealability deteriorates
Solution Approach 1:
The patent segments the packaging material into distinct layers with specialized functions. The sealant film layer uses materials with good heat sealability (such as polyethylene or polypropylene), while the base film provides gas barrier properties. This segmentation allows the sealant film to ensure excellent heat sealability without compromising the gas barrier properties provided by the base film
Solution Approach 2:
The patent employs composite material structure where different materials are combined in specific layers. The sealant film layer uses materials selected for their heat sealability, while the base film uses materials providing gas barrier properties. This composite approach allows the packaging material to simultaneously achieve excellent gas barrier properties and heat sealability
3Ease of manufacture
If conventional packaging material structure is used, then production simplicity is maintained, but film separation occurs during food packing, transportation, and display
Solution Approach 1:
The patent divides the packaging material into multiple functional layers with clear division of labor. Each layer is designed to perform specific functions, and the layered structure with adhesive layers between them ensures strong bonding, preventing film separation during food packing, transportation, and display while maintaining production simplicity through a standardized multi-layer construction approach
Solution Approach 2:
The patent introduces adhesive layers as intermediaries between the printed layer and the sealant film layer, and between the base film and the printed layer. These adhesive layers serve as mediators that ensure strong bonding between layers, preventing film separation during handling and use, thus improving reliability without significantly complicating the manufacturing process
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 proposed structure ensures excellent printed image quality, laminate strength, and heat sealability, preventing film separation and ensuring reliable packaging performance even with materials not typically capable of these properties.
Implementation Method 1
a primer layer; the primer layer being formed of a primer composition containing a water-soluble polyvalent metal salt, a chlorinated polyolefin emulsion, and at least one selected from the group consisting of an acrylic emulsion, a vinyl acetate emulsion, and a urethane-modified polyester resin
Implementation Method 2
an adhesive layer; the adhesive layer being formed of an aliphatic ester adhesive
Data Source
AI summary
The present invention aims to provide a packaging material having excellent printed image quality as well as excellent laminate strength and heat sealability. Provided is a packaging material including at least: a base film, a primer layer, a printed layer, an adhesive layer, and a sealant film in a stated order, the primer layer being formed of a primer composition containing a water-soluble polyvalent metal salt, a chlorinated polyolefin emulsion, and at least one selected from the group consisting of an acrylic emulsion, a vinyl acetate emulsion, and a urethane-modified polyester resin, the printed layer being formed of a printing ink containing a polyester polyurethane resin, the adhesive layer being formed of an aliphatic ester adhesive.