Spot welding extrusion filters for plastics recycling
From individual mesh sections to a complete filter assembly
During plastic extrusion, filters are used to remove paper, sand, metal particles and other contaminants from the molten plastic. For effective filtration, an extrusion filter may consist of several layers of woven metal mesh. Each layer fulfils its own specific function within the filter assembly.
Royal Dinxperlo manufactures the individual mesh sections and can join them together using spot welding. This results in a complete, ready-to-use extrusion filter in which the various layers are held firmly together. The dimensions, mesh specifications and composition are tailored to the extrusion plant and the desired level of filtration.
The challenge of joining multiple mesh layers
A multi-layer extrusion filter may consist of different types of woven mesh. The individual layers must remain correctly aligned with one another during the installation and use of the filter. If the layers shift or become loose, this can complicate the installation of the filter and affect the performance of the filter pack.
Joining finely woven mesh requires precision. The welded joint must secure the different layers sufficiently, without unnecessarily affecting the filter surface. Therefore, the position of the weld points and the welding technique used must be carefully tailored to the shape, dimensions and construction of the extrusion filter.
Production begins with the selection of the correct woven wire mesh. Depending on the application, we combine multiple layers of mesh with different mesh sizes and wire diameters. This creates a filter assembly that provides both the necessary support and the desired filtration fineness. We then join the individual layers together by welding.
First, we cut the mesh layers to the desired shape and dimensions. Round, oval, rectangular and other customer-specific shapes are possible. We then position the layers precisely on top of one another. This creates a filter assembly that is tailored to the extrusion process and the required filtration.
Joining extrusion filters using spot welding
Once we have correctly positioned the various mesh layers, we join them using spot welding. With this welding technique, we create small, strong joints between the layers at specific points.
The spot welds hold the filter assembly together during transport, installation and use. At the same time, the majority of the mesh surface remains available for the flow and filtration of the molten plastic. This results in a practical, easy-to-handle filter assembly that fits into the extrusion plant as a single complete component.
Royal Dinxperlo specialises in welding, plasma welding and spot welding of woven mesh. This enables us to tailor the welded joint precisely to the mesh used and the technical requirements of the application. Furthermore, when determining the welding points, we take into account both the strength and the available filter surface area.
Applications of welded extrusion filters
Manufacturers can use spot-welded extrusion filters within various plastics processing operations. For example, they are suitable for:
Recycling used plastics.
Filtering plastic melt during extrusion.
The production of recycled plastic granules.
Removing contaminants from plastic streams.
The production of plastic profiles, films and other extrusion products.
Every plastic stream contains different materials and contaminants. We therefore tailor the composition of the filter pack to the type of plastic, the contaminants present and the desired end product. In this way, each filter layer fulfils a specific function within the overall filtration process.
Customised spot-welded extrusion filters
Every extrusion line and plastic feedstock places different demands on the filter. That is why Royal Dinxperlo manufactures both single-layer filters and multi-layer filter packs to customer-specific requirements.
We can customise the following characteristics, amongst others:
The shape and external dimensions of the filter.
The mesh size and wire diameter.
The number of mesh layers.
The order and function of the various layers.
The position and number of weld points.
The desired filtration level.
The required flow rate of the plastic melt.
First, we determine which mesh specifications and filter construction are suitable for the application. We then carefully coordinate the cutting, assembly and spot welding processes. This results in a complete filter solution that is precisely tailored to the extrusion plant.
Why choose Royal Dinxperlo?
Royal Dinxperlo combines extensive knowledge of woven metal mesh with considerable experience in the precision welding of mesh components. This enables us not only to produce the required filter material, but also to assemble multiple layers into a complete extrusion filter.
Furthermore, we carry out production and further processing under one roof. This allows us to maintain control over dimensions, positioning and quality throughout the entire production process. In addition, we can accurately reproduce the design for recurring production runs.
Our advantages:
Customised single-layer and multi-layer extrusion filters.
Spot welding of multiple cut-to-size mesh components.
Precise positioning of the various filter layers.
Strong bond with minimal impact on the filter surface.
Combination of different mesh sizes and wire diameters.
Dimensions and shapes tailored to the extrusion plant.
Production and further processing under one roof.
Consistent quality for recurring production runs.
Technical expertise in the fields of wire mesh, filtration and welding techniques.
European production and high delivery reliability.
Need spot-welded extrusion filters?
Do you need a single-layer extrusion filter or a multi-layer filter pack for plastic extrusion or plastic recycling? Royal Dinxperlo works with you to determine the right mesh, the filter configuration and the required welded joints.
First, we precisely cut the individual mesh sections to the desired shape. We then assemble the filter layers in the correct order and join them using spot welding. This means you receive a complete extrusion filter that you can use straight away in your production process.
