Cyclic Polyolefin Sealant Laminate for Non-Adsorbing Packaging
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Solution Overview
Problem
Conventional thermoplastic resins used in packaging materials for food and medicine tend to adsorb contents, leading to degradation, and stable polyacrylonitrile resin films are difficult to procure, necessitating the development of alternative materials with non-adsorbing and high adhesion properties.
Innovation Solution
A laminate structure comprising a base material layer, a thin adhesive layer, and a non-oriented cyclic polyolefin resin sealant layer with a thickness range of 10 μm to 40 μm, achieving high adhesion strength and minimizing adsorption, while the adhesive layer is optimized for thickness and composition to enhance seal strength and prevent delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyethylene resin or polypropylene resin is used as the sealant layer, then adhesion strength in heat sealing is improved, but adsorption of food or medicine components occurs leading to content degradation
Solution Approach 1:
The sealant layer is divided into multiple functional layers: a polyacrylonitrile resin layer (providing non-adsorbing property) and a thermoplastic resin layer (providing heat-sealing and adhesion properties). This segmentation allows each layer to perform its specific function without compromising the other.
Solution Approach 2:
The invention uses a composite sealant layer comprising polyacrylonitrile resin and thermoplastic resin in a specific composition ratio (polyacrylonitrile resin: 30-80 mass%, thermoplastic resin: 20-70 mass%). This composite structure combines the non-adsorbing property of polyacrylonitrile with the heat-sealing capability of thermoplastic resin.
2Object-generated harmful factors
If polyacrylonitrile resin is used as the sealant layer, then non-adsorbing property is improved, but adhesion strength and film-forming property deteriorate
Solution Approach 1:
The invention uses a composite sealant layer comprising polyacrylonitrile resin and thermoplastic resin in a specific composition ratio (polyacrylonitrile resin: 30-80 mass%, thermoplastic resin: 20-70 mass%). This composite structure combines the non-adsorbing property of polyacrylonitrile with the heat-sealing capability of thermoplastic resin.
Solution Approach 2:
The invention optimizes the composition ratio of polyacrylonitrile resin to thermoplastic resin within specific ranges (polyacrylonitrile resin: 30-80 mass%, thermoplastic resin: 20-70 mass%) to balance non-adsorbing property, adhesion strength, and film-forming property. It also controls the thickness of the sealant layer (10-40 μm) to achieve desired performance.
3Strength
If the adhesive layer thickness is increased, then adhesion strength between base material layer and sealant layer is improved, but the laminate structure becomes more complex and material usage increases
Solution Approach 1:
The invention optimizes the thickness of the adhesive layer within a specific range (0.1-1.0 μm) to achieve sufficient adhesion strength while minimizing material usage and maintaining a compact laminate structure. This precise parameter control allows thin adhesive layers to provide adequate bonding.
Solution Approach 2:
The adhesive layer is strategically positioned between the base material layer and the sealant layer, with its thickness and composition optimized specifically for this interface to provide maximum adhesion where needed while keeping the overall structure thin.
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 exhibits excellent non-adsorbing properties and high adhesion strength, preventing content degradation and reducing delamination, even when stored for long periods, thus ensuring the integrity of packaged items.
Implementation Method 1
an adhesive layer; and a non-oriented sealant layer... bonded to the base material layer via the adhesive layer, and an adhesion strength between the base material layer and the sealant layer is 0.8 N/15 mm or more
Data Source
AI summary
Provided is a laminate including a base material layer, an adhesive layer having a thickness in a range of 0.1 μm to 1.0 μm, and a non-oriented sealant layer having a thickness in a range of 10 μm to 40 μm and made of a cyclic polyolefin resin, wherein one main surface of the sealant layer constitutes an outermost surface of the laminate, the other main surface of the sealant layer is bonded to the base material layer via the adhesive layer, and an adhesion strength between the base material layer and the sealant layer is 0.8 N/15 mm or more.