Laminated Sheet Reinforcing Layer Prevents Tearing
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Solution Overview
Problem
Existing laminated sheets used for medicine containers face issues when formed into a dome shape, as the ceiling and end portions tend to tear, compromising the barrier properties and absorbability.
Innovation Solution
A laminated sheet structure comprising an absorbing layer, a reinforcing layer, an aluminum layer, and a gas-barrier layer, with adhesive layers in between, where the reinforcing layer is positioned between the absorbing and aluminum layers to enhance strength and prevent tearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier layer, adhesive layer, aluminum layer, adhesive layer, and adsorbing layer are laminated in order from above, then barrier property (airtightness) is improved, but the ceiling portion of the container is torn through and the skirt portion and shoulder portion are torn during forming
Solution Approach 1:
The patent divides the container structure into multiple functional layers: an adsorbing layer (for moisture and smell absorption), a reinforcing layer (for mechanical strength), an aluminum layer (for barrier properties), and a barrier layer (for additional protection). Each layer performs a specific function, and their combination resolves the contradiction between barrier property and structural integrity during forming.
Solution Approach 2:
The patent uses a composite laminated structure combining different materials with distinct properties: the adsorbing layer uses moisture-absorbing materials, the reinforcing layer uses high-strength materials, the aluminum layer provides barrier properties, and the barrier layer adds protective functionality. This composite approach allows simultaneous achievement of barrier property and structural integrity.
2Reliability
If an adsorbing layer is added to the container structure, then absorbability is improved, but the container structure becomes more complex and more prone to tearing during forming
Solution Approach 1:
The patent segments the container into distinct functional layers, with the adsorbing layer positioned at the innermost side to directly contact the medicine. This segmentation allows the adsorbing function to be added without compromising the overall structural integrity, as each layer is optimized for its specific function and the reinforcing layer provides mechanical support.
3Shape
If the container is formed into a dome shape by pressing, then the desired container shape is achieved, but the ceiling portion and end portions tear during the forming process
Solution Approach 1:
The reinforcing layer is positioned at the outermost side of the laminated structure before the forming process begins. This preliminary placement of the reinforcing layer provides mechanical strength to the ceiling portion and end portions during the dome-shape forming process, preventing tearing while allowing the desired shape to be achieved.
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 maintains absorbability and improves barrier properties while preventing tears during the forming process, ensuring the container's integrity and effectiveness in protecting the medicine.
Implementation Method 1
an adsorbing layer having an adsorbent is sometimes disposed inside the container (laminated sheet)
Implementation Method 2
the aluminum layer is formed in the inside of a container, the transparency of a container is lost
Implementation Method 3
the aluminum layer is formed in the inside of a container, the transparency of a container is lost
Implementation Method 4
the liquid- and/or gas-barrier layer is formed of biaxially-oriented poly-amide or polyethylene terephthalate
Data Source
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AI summary
A container (40) includes: an absorbing layer (50) absorbing at least one of liquid and gas; a reinforcing layer (70) laminated on the absorbing layer (50) with an adhesive layer interposed therebetween; an aluminum layer (80) laminated on the reinforcing layer (70) with an adhesive layer interposed therebetween; and a barrier layer (90) laminated on the aluminum layer (80) with an adhesive layer interposed therebetween and suppressing entry of at least one of liquid and gas.