METHOD FOR MANUFACTURING A RECESS PLATE

Abstract

A recess plate designed for use in a filter device for filtering a suspension includes a stationary head piece and a movable end piece, and a pack including copies of the recess plate, having a filter chamber inside the pack, adjoining the recess plate, having a first pipe for filling the suspension into the filter chamber, having a filter cloth for collecting a solid content out of the suspension, and having a second pipe for discharging a liquid fraction of the suspension out of the filter chamber as a filtrate, wherein the filter device may be closed before filtering by forcing the end piece in direction of the head piece, and opened after filtering by releasing the end piece, and moving the end piece away from the head piece for removing the filter cake from the filter cloth.

Claims

1. A method for manufacturing a recess plate to be used in a filter device for filtering a suspension, the filter device having a stationary head piece and a movable end piece, and a pack including copies of the recess plate, having a filter chamber inside the pack, adjoining the recess plate, having a first pipe for filling the suspension into the filter chamber, having a filter cloth for collecting a solid content out of the suspension, and having a second pipe for discharging a liquid fraction of the suspension out of the filter chamber as a filtrate, wherein the filter device may be closed before filtering by forcing the end piece in direction of the head piece, and opened after filtering by releasing the end piece, and moving the end piece away from the head piece for removing the filter cake from the filter cloth, wherein a. a first sheet is formed to provide a first surface of the recess plate at the filter chamber, and a second sheet is formed to provide a second surface of the recess plate vis-à-vis the first surface, b. a foam is injected into a spacing between the first sheet and the second sheet, and c. after hardening of the foam, the spacing is filled by a rigid body, d. the first sheet and the second sheet are mounted to a frame, wherein the frame contains all drills and bores required for the filtrate, and e. the foam, together with the frame, forms the rigid body.

2. The method according to the preceding claim, wherein the sheet is from fabric.

3. The method according to claim 1, wherein the fabric is reinforced by fibers.

4. The method according to claim 1, wherein the fibers are fiber-glass.

5. The method according to claim 1, wherein the fabric is penetrated with a hardened resin.

6. The method according to claim 1, wherein the resin is polyethylene.

7. The method according to claim 1, wherein the first surface and/or the second surface are formed by pressing the respective first sheet and/or second sheet to a solid mold.

8. The method according to claim 1, wherein a protective sheet is arranged between the respective first sheet and/or the second sheet and the solid mold, and removed from the first surface and/or the second surface, after forming.

9. The method according to claim 7, wherein the first surface and the second surface are formed by arranging the first sheet and the second sheet between two solid molds, and inserting a pressing agent between the first sheet and the second sheet.

10. The method according to claim 7, wherein a fluid is used for pressing the first sheet and/or the second sheet to the solid mold.

11. The method according to claim 1, wherein the fluid is hot water.

12. The method according to claim 1, wherein the rigid body is glued to at least one of the first sheet and the second sheet.

Description

BEST MODE FOR CARRYING OUT THE INVENTION

[0020] The recess plate manufactured according to the invention and the associated method are subsequently described in more detail with reference to the drawing figures, showing schematic cuts through the sheets, molds, and the resulting recess plate during four steps in the manufacturing process.

[0021] In manufacturing a recess plate 1 according to the invention, as shown in FIG. 1, a stack of two sheets 2, 3 from glass-fiber reinforced fabric, soaked with liquid PE, each lined by two protective sheets 4, 5—here: plastic foils—is inserted between two female solid molds 6.

[0022] The solid molds 6 are then pressed, and clamped (clamps not shown) together, to ensure sealing of the recesses 7 inside, as shown in FIG. 2.

[0023] As shown in FIG. 3, hot water 8 is then fed between the two sheets 2, 3, pressing the same into the recesses 7. After hardening of the PE, the hot water 8 is discharged, the solid molds 6 are opened. Until now, the first surface 9 of the first sheet 2 and the second surface 10 of the second sheet 3 are facing each other.

[0024] The sheets 2, 3, now having the shape of the respective recesses 7, and being dimensionally stable, are removed from the solid molds 6. The protective sheets 4 are removed from the flip sides 11 of the sheets 2, 3, and, as shown in FIG. 4, and the sheets 2, 3 reversed to have the flip sides 11 of the sheets 2, 3 facing each other. The sheets 2, 3 are mounted to a prepared frame 12, containing all the drills and bores required for filtrate, wash water, air etc. Then the hollow space 13 between the sheets 2, 3 is filled with a structural foam 14 core material using a SAN polymer base featuring high toughness and impact resistant characteristics, e.g. available under the trade name Corecell™ M from Gurit Holding AG, Wattwil/Switzerland. After hardening, together with the frame 12, the foam 14 forms the rigid body 15 of the recess plate 1.

[0025] The protective sheets 5 remain on the first surface 9 and on the second surface 10, until delivery.

[0026] In the figures are

[0027] 1 recess plate

[0028] 2 first sheet

[0029] 3 second sheet

[0030] 4 protective sheet

[0031] 5 protective sheet

[0032] 6 solid mold

[0033] 7 recess

[0034] 8 water

[0035] 9 first surface

[0036] 10 second surface

[0037] 11 flip side

[0038] 12 frame

[0039] 13 hollow space

[0040] 14 foam

[0041] 15 rigid body