FI86806C - NAETFILTERPAOSE FOER FILTERING AV PAPPERSMASSA - Google Patents

Description

λ 86806

This invention relates to a filter device and more particularly to filters of the type used to filter sludges, such as cellulose pulp, in papermaking.

One of the types of filters currently in use includes a filter holder and a filter bag attached to the holder. The filter bag is made of a suitable material such as polypropylene. A polypropylene bag is placed on top of the filter holder and opposite longitudinal edges of the bag 15 are secured by fastening members. The fastening parts are also made of a suitable material, such as polypropylene.

Unfortunately, when the temperature of the slurry is, for example, above 165 ° C, the fasteners begin to rupture and detach from the polypropylene filter bag. When this happens, the solids pass through the filter bag and the metal bracket, which is of course undesirable.

The present invention relates to a mesh filter bag according to the preamble of claim 1, the main features of which are defined in the rest of claim 1.

The present invention provides a filter having a filter bag 30 securely attached to a filter holder.

The mounting part used, for example, in currently used filter bags has been eliminated. The rope members run along opposite edges of the longitudinal opening of the filter bag. The rope members are embedded inside the opposite edges of the filter bag. Opposite edges are held in sealing contact by a sealing member, such as a longitudinal tube.

2 86806

Briefly, the invention is a filter for removing liquid from a slurry. The mains filter bag is attached to a metal bracket. The metal bracket has openings next to the mesh filter bag to allow the filter to flow into the metal ground bracket. The metal support has at least one outlet channel for directing the filter away from the support. The mesh filter bag has opposite edges that extend longitudinally along one side of the mesh filter bag from the bottom of the bag to the top of the bag. The rope member 10 is embedded in opposite edges. The members are in sealing contact with the opposite edges.

In short, the new mesh filter bag is a flexible preformed mesh filter bag suitable for mounting on top of 15 rigid filter bag holders. The flexible preformed mesh filter bag has two edges with embedded rope members. The two edges are located so that when the bag is installed, it has one side with laterally opposite edges extending in the length-20 direction from the bottom of the bag to the top of the bag. The edges are suitable for providing a sealing connection when mounting the bag on top of the filter bag holder.

The invention, as well as its many advantages, is further discussed with reference to the following detailed descriptions and drawings, in which:

Figure 1 is a side elevational view of a filter lamella made in accordance with one embodiment of the invention, showing a portion of the pouch removed.

Figure 2 is a side elevational view of the embodiment of Figure 1.

Figure 3 is an enlarged fragmentary sectional view of a structure for attaching a filter-35 bag to a support with a sealing rigid connection.

Figure 4 is an enlarged view of Figure 1 taken along lines 4-4.

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Figure 5 is a partial enlarged view of one end of the connecting pipe of Figure 1.

Figure 6 is a view of Figure 5 taken along lines 6-6 in the direction of arrows 5.

Figure 7 is an end view of the sealing tube of Figure 5.

In the various figures, the corresponding parts are referred to by the corresponding reference numerals.

Referring to the drawings, and more particularly to Figure 1, there is shown a filter lamella of a disc type filter to illustrate the invention. The filter lamella 10 is attached to a common rotating hub 12 in parallel with other filter lamellae, with adjacent parts indicated by dotted lines. The lamella 10 is connected at its outer end to adjacent lamellae by tubular clamps 14 which close the lamellae to the inside and the lamellae are fixed to the clamps 20 by suitable fasteners (not shown in the figures). Each tubular clamp 14 extends over portions of adjacent peaks of parallel filter lamellae 10. The tubular clamp 16 connects the tubular clamps 14 on the inside to completely close the outer end of each filter lamella 10.

The lamella 10 comprises a base 18 containing a box-like central body, the walls 20 of which close a downwardly tapering tube or duct 21 connected to one of the flow channels 24 in the hub 12 30 for guiding the filter from the lamella 10.

The lamella 10 also has two axially spaced side walls 26, 28 (see Figure 4), each 35 fixed at one end to the base 18 and extending longitudinally from the base 18 on opposite sides. The side walls overlap the sides of the radially advancing filter lamellae. The wall walls 26, 28 act as a support for the filter bag, and each wall has a plurality of radially extending circumferentially spaced strips 41 separated by slats 44 (see Figure 1). The space 30 between the side walls 26, 28 (see Fig. 4 4), which is the entire length and width of the side walls 26, 28, acts as an outlet duct and communicates with the duct 21 in the bottom 18 to lead the filter out of the filter lamella.

A flexible preformed mesh filter bag 32 is mounted on the side walls 26 and 28 of the filter bag support portion 10. The preformed mesh filter bag 32 is a single unitary piece. In the manufacturing step, a rope tongue is embedded in the filter bag so that when the bag is mounted on the bag support 15 it has laterally opposite edges 34 and 36 (see Figure 4) extending longitudinally from the open bottom of the bag to the closed top of the bag. The rope portions 38, 40 are enclosed within loops 42 and 43 located at opposite edges 34 and 36, respectively.

20

The open bottom of the preformed flexible mesh filter bag abuts the sewn hem that runs around the entire bottom of the preformed flexible mesh filter bag 32. The annular rope 46 is embedded inside the skirt 48. The rim 25 49 closes the bottom of the flexible preformed filter bag 32 tightly around the lamella 10 of the rigid filter bag holder.

The mesh filter bag 32 can be made of polypropylene and the annular rope 46 can also be made of polypropylene

After the flexible preformed mesh filter bag is mounted on the metal support member 10, the left-handed edges 34 and 36 are brought into sealing contact by a longitudinally extending tube 50. Opposite edges 34 and 36 extend longitudinally along the open side of the mesh filter bag 32 from the bottom of the bag to the top of the bag. If desired 86806 5, two separate ropes can be embedded in each of the opposite edges 34 and 36. However, preferably the rope member consists of one rope extending from the bottom of the filter bag along one opposite edge 34 over the top of the filter bag 5 and along the other opposite edge 36 to the bottom of the filter bag. As shown in Figure 4, portions 38 and 40 of one rope extend longitudinally along opposite edges 34 and 36 and are laterally separated on different sides of the same plane. The rope may be made of polypropylene or any other suitable flexible material.

The tube 50, which holds the opposite edges 34 and 36 in sealing contact, is fitted over the loops 42 and 43 and extends the entire length of the opposite edges. The tube 50 has a longitudinal slot 62 (see Figures 6 and 7) through which opposite edges, loops and rope sections pass. Inverted surfaces 63 and 65 are formed in the longitudinal slot 62, which are formed as protruding lips 64 and 66, respectively, on each side of the longitudinal slot 62. Each open end of the tube 50 is applied outward (one application is shown in Figure 7).

The bag 32 is mounted on top of the filter bag bracket. The Me-25 stable tube 50 is slid over the loose longitudinal edges of the bag in which the rope is sewn to effectively seal the sides of the bag. The inverted surfaces 63 and 65 and the applied ends of the tube prevent damage to the bag during the installation, shrinkage and operation phases.

30

The tubes 50 are constructed to prevent the enclosed rope, i.e. the edges of the bag, from protruding laterally from the tube. The longitudinal movement of the tube 50 is limited by a clamping strap 49 at the lower end and a locking clamp 14 35 at the upper end.

Claims (3)

1. Flexible, preformed mesh filter bag (32) of fibrous material intended to be installed over a top-down downwardly tapered, rigid filter bag support (10) which has openings (44) for the filtrate flow into the support and a device (24) thereon. one end of the support for draining filtrate from the support, characterized in that the mesh bag is a continuous, molded mesh bag (32) with two side edges (34, 36) into which a rope member (38, 40) is arranged so that the mesh bag 10 is installed on its support (10), two opposing side edges of the side of the strip extend from the bottom of the strip to the top of the strip, the edges being sealingly engaged with each other by means of a closure formed by the strip. which includes a device (18) with which the bag is arranged on the tapered, rigid bag support (10) and a device (49) with which the bag is retained there, and a device (50) with which the opposing edges (34, 36) poured into dense and that the rope means comprises a single rope (38, 40) extending from the bottom, along opposite side 20 (38), over the upper part of the paw and along the second mating edge (40) to the bottom of the paw. A mesh filter bag according to claim 1, characterized in that the device for sealing the opposing side edges 25 (34, 36) in a sealing engagement is a tube (50) arranged over these edges and extending over the entire length of the edges. Net filter bag according to claim 2, characterized in that the pipe (50) has wide open ends, a longitudinal slit (62) in which the opposing edges extend, and a leaky protruding lip (64, 66) on each side of the slot. The mesh filter bag according to claim 1, characterized in that the material of the bag (32) and the rope (38, 40, 46) are polypropylene.