Filter Bag Sealing Method Using Pre-Sewn Silicone Sealant
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Solution Overview
Problem
Existing methods for sealing filter bag joints, such as using PTFE tape or silicone layers on the outside, suffer from low mechanical resistance, ease of detachment, and inefficiency in sealing non-overlapping edges, particularly in bags with round bottoms, and are not suitable for all filtration materials.
Innovation Solution
A method where a liquid or semi-liquid silicone sealant is applied to the surfaces of filtration material edges before sewing, ensuring a secure and durable seal, and the edges are sewn together with thread, effectively sealing all joint points and reinforcing the bag structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PTFE tape or silicone layer is applied on the outside surface of filter bag, then sealing of filtration material joints is achieved, but mechanical resistance of sealing is low and it easily detaches from bag surface
Solution Approach 1:
The sealing layer is applied to the filtration material edges before sewing the joints together. This preliminary application ensures that the sealing material is positioned correctly and will be embedded within the seam structure, preventing detachment and improving mechanical resistance while maintaining sealing effectiveness.
Solution Approach 2:
The sealing function and structural joining function are merged into a single sewing operation. The sealing layer applied beforehand becomes an integral part of the seam, combining the benefits of sealing and mechanical joining in one process, thereby eliminating the weakness of separate sealing applications that easily detach.
2Adaptability or versatility
If PTFE tape with glue layer is used for low temperature resistance filtration materials, then seam covering is possible, but temperature resistance decreases due to glue and it cannot be used for majority of non-PTFE filtration materials
Solution Approach 1:
The sealing layer is designed to be universally applicable to all types of filtration materials including PTFE, polyester, polypropylene, and other non-PTFE materials. By eliminating material-specific constraints and using a通用的 sealing approach that works with all fabrics, the solution achieves broad compatibility without sacrificing temperature resistance.
Solution Approach 2:
The invention changes the application parameters of the sealing layer - applying it as a liquid or paste before sewing rather than as a pre-formed tape with glue. This parameter change allows the sealing material to bond directly to the filtration material through the sewing process itself, enabling use with all material types while maintaining high temperature resistance.
3Ease of manufacture
If sealing layer is applied on ready-made bag, then sealing process is simplified, but it is difficult to cover all joint points effectively and inter-material spaces are not sealed efficiently
Solution Approach 1:
The sealing layer is applied to the filtration material edges before the sewing process, allowing precise placement at each joint location. This preliminary application ensures that every seam and inter-material space is covered with sealing material before joining, achieving complete coverage of all joint points while maintaining manufacturing simplicity.
4Reliability
If conventional sealing methods are used, then sealing of overlapping edges is achieved, but non-overlapping edges at round bottom seams are not sealed efficiently
Solution Approach 1:
The sealing method is designed to work universally with all bag designs including round bottoms, rectangular bottoms, and various seam configurations. By applying the sealing layer to the edges before sewing rather than relying on specific overlapping geometries, the method achieves complete sealing effectiveness across all bag types and designs.
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 provides long-lasting, efficient sealing of all filtration material joints, preventing product contamination and ensuring reliable performance across various bag designs and materials, including those with non-overlapping edges.
Implementation Method 1
a liquid or semi-liquid silicone sealant is applied to the surfaces of filtration material edges before sewing, ensuring a secure and durable seal
Data Source
AI summary
A method of sealing a filter bag at the stitched joints of the filtration material, consisting in forming the filter bag out of at least one filtration material piece, whereupon the surface of at least one filtration material edge being joined is covered with a liquid or semi-liquid layer of a sealant in such a way that the filtration material edges being joined are in contact with one another at least on the surface covered with the sealant. After the sealant layer has been applied, the filter bag elements prepared beforehand are combined together permanently by sewing them with a thread. A filter bag formed of at least one filtration material piece whose edges (2) and (3) are joined together with a thread (5), with at least one stitch, is characterised by the fact that at the stitched places between the adjoining surfaces of the filtration material edges (2) and (3) being combined there is a sealant layer (4), applied before sewing.