Most filtration elements, whether intended for the automotive industry, household equipment or industrial installations, require an operation to assemble the filter membranes with the thermoplastic parts.
Thanks to its expertise, SONIMAT is a recognized manufacturer for these standard and customized thermoplastic welding machines. We offer welding technologies that can be perfectly adapted to the filtration industry: infrared and hot plate welding (HPW), ultrasonic (ESW), laser welding (LSW), spin welding (RSW) or hot staking.
For every single application, we review all parameters of the project with you to find the solution that provides the most cost-effective. Deciding factors include product specifications, functional demands, materials used, part size/geometry, production quantities, Automation and overall costs.
Our technical solutions will allow you to reach high production speeds, optimal repeatability and comprehensive process safety options.
Ultrasonic technology is mainly used to weld two layers of pleated filters, which are mostly made of thermoplastic materials such as polyester or polypropylene. Depending on the size of the filter, it is possible to use either a ultrasonic continuous welder system or a specific tool to fix the filter within a plastic frame.
Example of ultrasonic welded filter: Pleated filter (Single or multi-layers), Air/Oil Filters, Welded Tubular Filter, Bag Filters
Laser welding provides reliability and robustness. It is generally used for automative transmission filter because these filter media are integrated into a PA66GF35 oil pan housing. In order that filters keep their promises, they must be perfectly welded to ensure a
perfect seal under the working pressure conditions.
For this type of application, the laser welding solution was chosen because of the hight tolerances between the filter material and the plastic parts.
Example of laser welded filter: automative transmission filters
Infrared welding technology is very suitable for inserting the paper filter within the plastic lids. It’s a great alternative to the chemical process of polyurethane potting system, which is sometimes used for welding paper filters and is very expensive.
In addition, our expertise in infrared welding technology enables us to weld technical plastics to the filter with a high degree of interpenetration precision, thanks in particular to the force sensors integrated in our HPW machines.
Example of infrared welded filter: Paper filter
Spin welding technology provides a clean weld and guarantees the tightness and tamper-evidence of the filter housings.
Our spin welding machine RSW guarantees high production speeds, optimum repeatability and comprehensive process safety options.
Example of spin welded filter: Water purification cartridges
Hot plate welding technology, like spin welding technology, provides a tamper-evidence of the filter housings. It is appropriate for distant welding.
It provides increased sealing, burr control, and doesn’t pollute welded enclosures. In addition, it offers great freedom on the shape of the surfaces to be welded.
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