Biopharmaceutical Bag Frame Weld Reinforcement
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Solution Overview
Problem
The existing biopharmaceutical product bags face issues with weld integrity due to difficulties in matching materials for welding, leading to potential leakage or contamination, especially under mechanical stress or overfilling conditions.
Innovation Solution
A biopharmaceutical assembly featuring a flexible plastic envelope with a frame that encloses the welded perimeter of the pocket, applying reinforcing pressure to the weld to prevent breakage and maintain geometric integrity, using a multilayer film with a contact layer compatible with the product and a barrier layer to prevent gas passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the walls are welded together to ensure hermetic sealing, then the pocket prevents leakage and contamination, but the weld may yield under excessive forces or overfilling conditions
Solution Approach 1:
The frame is designed to apply preemptive reinforcing pressure to the weld zone before excessive forces or overfilling conditions occur. This prior cushioning prevents the weld from yielding under stress by maintaining constant compressive force on the welded perimeter, thereby preserving both hermetic sealing and weld integrity simultaneously.
Solution Approach 2:
The frame acts as an intermediary element between the pocket walls and external forces. It distributes and absorbs mechanical stresses that would otherwise directly compromise the weld, protecting the hermetic seal while maintaining weld strength through its structural support and reinforcing pressure.
2Reliability
If multilayer film materials are used with contact layer for product compatibility and barrier layer for gas prevention, then the pocket meets biopharmaceutical requirements, but the materials are difficult to match for welding
Solution Approach 1:
The frame serves as a mediator that compensates for the welding difficulties of multilayer film materials. By applying external reinforcing pressure, it enhances weld strength without requiring changes to the multilayer film composition, thus maintaining product compatibility and gas barrier properties while overcoming manufacturing challenges.
Solution Approach 2:
The frame modifies the mechanical parameters (applying reinforcing pressure) of the welded joint to compensate for the inherent welding difficulties of multilayer materials. This parameter change strengthens the weld without altering the material properties needed for product compatibility and gas prevention.
3Adaptability or versatility
If the pocket is made flexible to expand for receiving biopharmaceutical product, then the pocket can be filled and emptied, but the weld may yield when excessive forces are applied during filling or transport
Solution Approach 1:
The frame provides preemptive structural support to the weld zone before excessive forces occur during filling or transport. This prior cushioning allows the pocket to expand flexibly while the frame maintains reinforcing pressure on the weld, preventing yield under dynamic loading conditions.
Solution Approach 2:
The frame acts as a counterbalancing structure that offsets the mechanical stresses applied to the weld during filling and transport. By providing opposing support force, it enables pocket expandability while protecting the weld from yielding under excessive forces.
Data Source
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AI summary
Assembly (20) for biopharmaceutical use comprising a bag (22) adapted to receive a biopharmaceutical product and a frame (24), the bag (22) being a flexible plastic envelope having at least one biopharmaceutical fluid inlet/outlet port (27) and comprising a first side wall (28) and a second side wall (30), the first side wall (28) and the second side wall (30) being partly joined by a weld (32), the weld (32) defining a welded perimeter (34) of the bag (22) and delimiting an internal space (36) of the bag (22), the frame (24) enclosing the bag (22) over a continuous course along the welded perimeter (34) at least in an area of the weld (32).