Multilayer Oxygen-Absorbing Packaging Material for Adhesive Patches
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Solution Overview
Problem
Adhesive patches containing easily oxidizable and oily components face issues with these components being adsorbed or migrated to packaging materials, leading to decreased transdermal absorbability and pharmacological effects due to oxidation, and existing packaging materials lack tearability, making them difficult for users with weak strength to open.
Innovation Solution
A multilayer-structured oxygen-absorbing packaging material is developed, comprising an oxygen barrier layer, an oxygen-absorbing layer, and a sealant film with a core layer containing cyclic polyolefin-based resin or acrylic resin, and an inner layer with isophthalic acid-modified polyethylene terephthalate, enhancing tearability while maintaining heat seal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hermetic packaging material is used to prevent adsorption and oxidation of components, then the pharmacological effects and transdermal absorbability are maintained, but the packaging material becomes difficult to open due to high mechanical strength
Solution Approach 1:
The packaging material is divided into multiple functional layers: an inner layer (polyester film) that provides barrier properties and maintains strength, and an outer layer (low-density polyethylene or ethylene-vinyl alcohol copolymer) that provides tearability. This segmentation allows each layer to perform its specific function without compromising the other.
Solution Approach 2:
Different regions of the packaging material have different properties: the inner layer has high mechanical strength and barrier properties for preservation, while the outer layer has low tear strength for easy opening. This local differentiation of material properties resolves the contradiction between strength and ease of opening.
2Strength
If a packaging material with high heat seal strength is used, then the packaging integrity is maintained, but the tearability is reduced making it difficult for elderly or children to open
Solution Approach 1:
The packaging structure separates the heat seal function (inner layer) from the tear function (outer layer). The inner polyester film layer provides high heat seal strength for packaging integrity, while the outer low-density polyethylene or ethylene-vinyl alcohol copolymer layer provides easy tearability for opening.
Solution Approach 2:
The packaging material uses a composite structure combining polyester film (for strength and heat seal) with low-density polyethylene or ethylene-vinyl alcohol copolymer (for tearability). This composite material approach allows simultaneous achievement of high heat seal strength and easy tearability.
3Strength
If a polyester film is used as packaging material, then the mechanical strength is high, but the tearability is poor and difficult to open
Solution Approach 1:
The packaging material is segmented into an inner polyester film layer that provides mechanical strength and barrier properties, and an outer layer of low-density polyethylene or ethylene-vinyl alcohol copolymer that provides tearability. This segmentation allows the polyester film to maintain strength without sacrificing ease of opening.
Solution Approach 2:
The outer layer of low-density polyethylene or ethylene-vinyl alcohol copolymer acts as an intermediary layer between the user and the inner polyester film layer. This intermediary provides the tearability needed for easy opening while the inner layer maintains the mechanical strength for packaging integrity.
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 packaging material effectively prevents the adsorption or migration of easily oxidizable and oily components, maintaining pharmacological effects and improving user accessibility by enhancing tearability without compromising heat seal strength.
Implementation Method 1
a film which is prepared by incorporating a certain amount of cyclic polyolefin-based resin and/or an acrylic resin in a polyethylene terephthalate-based resin can be used as an easily tearable film
Implementation Method 2
an oxygen barrier layer
Implementation Method 3
an oxygen-absorbing layer
Implementation Method 4
an inner layer having heat sealability
Data Source
AI summary
Provided is an oxygen-absorbing packaging material which is used for adhesive patches or the like containing an easily oxidizable component and an oily component, and which has improved tearability, while maintaining good heat seal strength. The present invention relates to an easily tearable oxygen-absorbing packaging material which has a multilayer structure comprising an oxygen barrier layer, an oxygen absorption layer and a sealant film, and wherein: the sealant film is a multilayer resin film that comprises at least a core layer and an inner layer having heat sealability; and the core layer contains 20-40% by mass of a cyclic polyolefin resin and/or an acrylic resin and 60-80% by mass of a polyethylene terephthalate resin relative to the total mass of the core layer.