Sheet Bonding Device Gas Substitution Method
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Solution Overview
Problem
Existing methods for substituting air in sealed spaces with desired gases during sheet bonding, such as in transfusion bags, are inefficient and require specialized instruments or large devices, leading to incomplete gas substitution and increased costs.
Innovation Solution
A sheet bonding method involving the formation of an area-enlarged portion on either the bonding target object or the functional sheet, allowing for gas substitution by spraying desired gas from the lower side, thereby preventing air re-entry into the sealed space without the need for gas nozzles or vacuum chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air substitution is performed by inserting a gas nozzle into the sealed space, then gas substitution can be achieved, but air may re-enter the sealed space when the nozzle is removed and device complexity increases
Solution Approach 1:
The gas nozzle is positioned to spray gas into the sealed space before the sealing process is completed. The sealing is then finished while the nozzle remains in place or is removed after sealing, preventing air re-entry. This preliminary action ensures gas substitution is performed at the optimal timing without requiring complex prevention mechanisms.
Solution Approach 2:
The gas nozzle is temporarily inserted only for the gas substitution step, then removed after sealing is completed. The sealing process itself prevents air re-entry, making the nozzle removal simple without requiring special prevention instruments. This extraction approach minimizes device complexity while ensuring reliable gas substitution.
2Reliability
If a vacuum chamber is used for deaerating the sealed space, then air can be removed effectively, but the device scale becomes large and costs increase
Solution Approach 1:
Instead of using a vacuum chamber, the invention uses a gas nozzle to spray inert gas directly into the sealed space. This pneumatic approach substitutes air with desired gas through pressure-driven gas flow, achieving effective air removal without requiring large vacuum equipment. The gas nozzle delivers high-velocity gas jets that displace air efficiently.
Solution Approach 2:
The invention changes the approach from vacuum-based air removal to pressure-based gas substitution. By controlling gas pressure and flow rate from the nozzle, air is effectively displaced and removed from the sealed space. This parameter change enables compact device design while maintaining high air removal efficiency.
3Reliability
If specialized instruments are used to prevent air re-entry during gas substitution, then gas substitution reliability improves, but manufacturing costs and running costs increase
Solution Approach 1:
The sealing process itself serves to prevent air re-entry after gas substitution. The sealing structure automatically closes the opening after the gas nozzle is removed, eliminating the need for separate prevention instruments. This self-service approach reduces manufacturing and running costs while maintaining reliability.
Solution Approach 2:
The gas substitution function and air prevention function are merged into a single sealing process. The same sealing structure that closes the opening also prevents air re-entry, eliminating the need for separate specialized instruments. This merging reduces overall system complexity and cost.
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 method efficiently substitutes air in sealed spaces with desired gases using a simple configuration, effectively preventing oxygen from entering and reducing the risk of liquid medicine deterioration, while eliminating the need for specialized instruments and large devices.
Implementation Method 1
a gas spray unit configured to spray gas to the area-enlarged portion from the lower side
Data Source
AI summary
A sheet bonding device includes a pressurization mold which is constituted of an upper mold and a lower mold and performs sealing through heating by sandwiching a sealing target portion of a bag main body and a sealing target portion of a gas barrier function sheet with pressurization surfaces; a plurality of support pins which are provided in the lower mold so as to be retractable and position the gas barrier function sheet with respect to one surface of the bag main body by penetrating the sealing target portions of the bag main body and the gas barrier function sheet; and gas spray means for making the gas barrier function sheet float by spraying inert gas to an area-enlarged portion, which does not overlap the bag main body, of the gas barrier function sheet supported by the support pins.