Bag-Shaped Container Flow Path Sealing Structure
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Solution Overview
Problem
Conventional flow path sealing structures for bag-shaped containers formed by fusion bonding resin sheets require multiple component parts for assembly and a separate fusion bonding step, leading to increased manufacturing costs and potential defects due to inconsistent sealing strength.
Innovation Solution
A flow path sealing structure is integrated into the bag-shaped container by forming a widened portion with a weakly sealed portion using a two-step fusion bonding process, where the weakly sealed portion is formed with a lower input heat per unit area to achieve controlled sealing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional flow path sealing member with multiple component parts is used, then the sealing function is achieved, but manufacturing costs increase due to assembly processes and separate fusion bonding steps
Solution Approach 1:
The patent merges the flow path sealing member with the bag-shaped container by integrally forming them from a single resin sheet through fusion bonding. This eliminates the need for separate component parts and assembly processes, reducing manufacturing costs while maintaining the sealing function. The sealing member is formed as part of the container structure itself, removing the need for additional fusion bonding steps to attach separate components.
2Ease of operation
If a weakly sealed portion is formed to enable easy opening, then the flow path sealing member can be opened easily, but the sealing strength becomes difficult to control and defective products may occur
Solution Approach 1:
The patent applies local quality by creating a weakly sealed portion with specifically reduced sealing strength at the opening location, while other portions of the container maintain normal sealing strength. This is achieved by controlling the fusion bonding parameters (such as heating time or temperature) only at the specific location where the weakly sealed portion is needed, allowing easy opening at that location without compromising the sealing strength of other areas.
3Ease of manufacture
If the same fusion bonding conditions are used for the entire flow path sealing structure, then manufacturing is simplified, but inconsistent sealing strength occurs leading to leakage or inability to open
Solution Approach 1:
The patent applies parameter changes by modifying the fusion bonding parameters (such as heating time, temperature, or pressure) specifically at the location where the weakly sealed portion is formed. This localized parameter adjustment creates the desired difference in sealing strength between the opening portion and other areas, enabling both easy opening and reliable sealing without compromising manufacturing simplicity.
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
This approach reduces manufacturing costs and ensures stable product quality by allowing for precise control of the sealing strength of the weakly sealed portion, preventing leakage while enabling easy opening when necessary.
Implementation Method 1
a flow path sealing structure disposed on a way of a flow path formed by fusion bonding a pair of resin sheets that are superimposed on each other
Implementation Method 2
a weakly sealed portion formed to extend in a widthwise direction in the widened portion, and which partitions the widened portion in a liquid-tight and airtight manner into a first region on a side of the one end and a second region on a side of the other end, the weakly sealed portion configured to be opened by increasing an internal pressure of the widened portion
Data Source
AI summary
A flow path sealing structure according to at least one embodiment of the present disclosure, which is disposed on a way of a flow path formed by fusion bonding a pair of resin sheets that are superimposed on each other, includes a widened portion surrounded by a widened seal portion formed by fusion bonding together the pair of resin sheets around a periphery thereof, and one end and another end of which are in communication with the flow path, together with being formed to be wider than the flow path, and a weakly sealed portion formed to extend in a widthwise direction in the widened portion, and which partitions the widened portion in a liquid-tight and airtight manner into the one end and the other end, together with being capable of being opened by increasing an internal pressure of the widened portion.