Method for Making a Filter Segment for a Disc Filter and the Filter Segment

Abstract

A disc filter disposed around a drum for filtering water. The disc filter includes a frame structure and a plurality of filter segments arranged around the drum and secured to the support. Each filter segment includes a filter frame having first and second portions and filter material integrated with the first and second portions of the filter frame through an injection moulding process.

Description

TECHNICAL FIELD OF THE INVENTION [0001]The present invention relates to a method and a device for making a disc-shaped filter segment for a disc filter, said filter segment comprising a filter frame and a filter material, said filter frame being adapted for a filter support of the disc filter.BACKGROUND ART [0002]A filter frame for a disc filter is previously known through EP-1 872 843. The filter frame consists of a cast aluminium frame and a filter material attached thereto by gluing. The filter material may be a cloth of metal, textile, or plastic material, which is mounted on the frame and pre-tensioned by hanging weights around the cloth before it is glued to the frame. Filter frames of stainless steel or pre-tensioned glass fibre have also previously been used, and have then been constructed from prefabricated profiles, which are joined together to form a filter frame. Even though filter frames made of aluminium have reduced the number of working operations as compared to cons...

AI Technical Summary

Benefits of technology

The present invention is about a filter frame and a filter segment for a disc filter. The filter frame is made by injection molding a reinforcement beam into a filter cloth, which increases stability and allows for a higher load on the filter segment. The filter material is integrated in a stretched condition between the lower and upper halves of the filter frame, resulting in a finished product with minimal bulging when loaded. The filter frame is made of glass fibre reinforced polypropylene, which is lightweight and suitable for injection molding. The filter material can be polyester, which exhibits sufficient strength and can be easily integrated into the filter frame material.

Problems solved by technology

Even though filter frames made of aluminium have reduced the number of working operations as compared to constructing frames from prefabricated profiles, the problem remains that a large amount of filter material is consumed when pre-tensioning the cloth, and additionally, the machining of the frame and gluing of the cloth have been very time consuming.

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