Composite Packaging Container Adhesive Layer Optimization
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Solution Overview
Problem
Conventional food storage containers like cans and glass jars have limitations such as high energy consumption, weight, storage inefficiency, and safety concerns during opening, while existing sheet-like composite containers face issues with mechanical stress defects and oxygen permeability, leading to reduced shelf life and storage challenges, especially for high-fat content foods.
Innovation Solution
A container formed from a sheet-like composite structure with a polymer outer layer, a carrier layer, a barrier layer, an adhesive layer, and a polymer inner layer, where the adhesive layer thickness is greater than the polymer inner layer thickness, and the container walls are predominantly made of a carrier layer for improved strength and sealing, reducing mechanical stress and oxygen permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesive layer thickness is increased to improve barrier layer adhesion and prevent delamination, then the resistance to stress corrosion cracking and sealing properties are improved, but the total material usage and production complexity increase
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness ratio between the adhesive layer and the polymer inner layer. Specifically, the adhesive layer thickness LTAL is set to be greater than the polymer inner layer thickness LTPIL, creating an optimal balance between adhesion performance and material efficiency. This parameter optimization ensures sufficient bonding strength to prevent delamination while controlling material consumption.
2Strength
If the carrier layer thickness is increased to improve container strength and mechanical resistance, then the resistance to stress corrosion cracking is improved, but the weight and energy consumption increase
Solution Approach 1:
The patent employs composite materials by creating a multi-layer structure consisting of a polymer outer layer, carrier layer, barrier layer, adhesive layer, and polymer inner layer. Each layer serves a specific function: the carrier layer provides mechanical strength, the barrier layer prevents oxygen permeability, and the adhesive layer ensures proper bonding. This composite structure achieves high mechanical strength and stress corrosion resistance while minimizing the thickness and weight of individual layers through functional specialization.
3Reliability
If the barrier layer is made more impermeable to oxygen to extend shelf life, then the shelf life is improved, but the resistance to mechanical stress and adhesion may be reduced
Solution Approach 1:
The patent applies local quality by assigning different functional properties to different layers of the composite structure. The barrier layer is specifically optimized for oxygen impermeability to extend shelf life, while the carrier layer and adhesive layers are optimized for mechanical strength and bonding respectively. This functional differentiation allows each layer to excel at its specific task without compromising the overall performance of the container structure.
4Ease of manufacture
If the container structure is simplified to reduce production complexity and cost, then the ease of manufacture is improved, but the resistance to mechanical stress and sealing properties may deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the container wall into five distinct functional layers, each with a specific purpose. The polymer outer layer provides structural integrity, the carrier layer provides mechanical strength, the barrier layer prevents oxygen permeability, the adhesive layer ensures bonding, and the polymer inner layer contacts the foodstuff. This segmentation allows for optimized production of each layer independently while ensuring the composite structure achieves superior sealing properties and mechanical resistance.
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 solution provides enhanced resistance to stress corrosion cracking, improved opening and sealing properties, and increased shelf life for high-fat content foods by minimizing material usage and simplifying production, while ensuring easy opening and reduced risk of contamination.
Implementation Method 1
an adhesive layer following the barrier layer in the direction of the container interior
Implementation Method 2
a barrier layer following the carrier layer in the direction of the container interior
Data Source
AI summary
The present invention relates to a container that delimits a container interior from the surroundings and that is formed at least in part from a sheet-like composite.