Insert Mould Tool Sealing Portion for Filter Cartridges
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Solution Overview
Problem
Conventional insert moulding tools require high press-on forces to form a seal, which can damage or deform fragile filter sheets, leading to potential perforation and reduced service life in products like particle filters.
Innovation Solution
The use of a mould tool with complementarily shaped mould pieces that apply a substantially evenly distributed pressure across a non-linear contact region, reducing the risk of damage and eliminating the need for high press-on forces by distributing the force over a larger area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high press-on forces are used to form a seal between mould pieces, then sealing effectiveness is improved, but the filter sheet may be damaged or deformed
Solution Approach 1:
The sealing portion of the mating surface is designed with a non-linear contact region that concentrates sealing pressure locally at the interface between mould pieces, while the linear contact regions maintain lower pressure on the filter sheet. This local differentiation allows effective sealing without damaging the filter sheet.
Solution Approach 2:
The invention changes the geometric parameters of the mating surface contact region from linear to non-linear, creating an areal contact region with increased surface area. This parameter change distributes the pressing force over a larger area, reducing peak pressure on the filter sheet while maintaining sealing effectiveness.
2Loss of substance
If high press-on forces are applied to create a seal, then polymer seepage is reduced, but the filter sheet may be perforated
Solution Approach 1:
The contact region transitions from a linear (one-dimensional) contact line to a non-linear areal (two-dimensional) contact region. This dimensional change increases the contact surface area, distributing the pressing force and reducing the risk of perforation while maintaining sealing to prevent polymer seepage.
3Ease of manufacture
If conventional linear contact regions are used, then manufacturing is simpler, but sealing effectiveness is reduced
Solution Approach 1:
The mating surface contact region incorporates a non-linear, curved geometry instead of a straight line. This curvature creates an areal contact region that improves sealing effectiveness by increasing contact area with the filter sheet, while still being manufacturable using conventional machining processes.
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 minimizes the risk of damaging the filter sheet during moulding, forms a well-defined edge, and reduces polymer seepage, thereby extending the service life and maintaining the filter's efficacy.
Implementation Method 1
the sealing portion being adapted, when pressure is applied to the mould pieces, to exert a substantially evenly distributed pressure across an area thereof
Data Source
Figure 1~4
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Figure 8~10
AI summary
An insert mould tool (10) for moulding an annular moulded portion (22) onto an insert such as a filter sheet (18) of a filter cartridge (5) comprises a plurality of mould pieces (12, 14) and means for applying pressure to the mould pieces. Each mould piece comprises complementarily shaped mating surfaces (16) and can be assembled to define an annular mould cavity (20) intersecting at least one mating surface (16) for defining the shape of the moulded portion (20) and an insert-receiving cavity (15) for receiving a portion of the insert (18). The insert-receiving cavity (15) comprises a sealing portion (17) extending radially inwardly of the annular mould cavity (20) for sealing receipt of a portion of the insert, the sealing portion being exerting a substantially evenly distributed pressure across an area thereof when pressure is applied to the mould pieces. Also disclosed is a method of insert moulding.