Device and method for the filtration of viscous material
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-029/96
B01D-029/00
출원번호
US-0380974
(2001-09-19)
우선권정보
AT-A 1627/2000(2000-09-26)
국제출원번호
PCT/AT01/000296
(2001-09-19)
§371/§102 date
20030318
(20030318)
국제공개번호
WO02/026472
(2002-04-04)
발명자
/ 주소
Bacher,Helmut
Schulz,Helmuth
Wendelin,Georg
출원인 / 주소
Bacher,Helmut
Schulz,Helmuth
Wendelin,Georg
대리인 / 주소
Townsend and Townsend and Crew LLP
인용정보
피인용 횟수 :
1인용 특허 :
2
초록▼
An apparatus for filtering viscous material, in particular thermoplastic synthetic plastic material, comprises a screw (24), which presses the material to be cleaned from an upstream conduit ( 3) of a supply housing (2) towards a band-shaped screen ( 4). The screen (4) is abutted on its downstream s
An apparatus for filtering viscous material, in particular thermoplastic synthetic plastic material, comprises a screw (24), which presses the material to be cleaned from an upstream conduit ( 3) of a supply housing (2) towards a band-shaped screen ( 4). The screen (4) is abutted on its downstream side by a perforated plate ( 6) against the pressure of the supplied material. The band-shaped screen (4) can be displaced for replacement of a soiled band section by a fresh band section. For facilitating this displacement a device is provided, which comprises a closure means ( 30) that is disposed on the upstream side of the screen (4), by which closure means the upstream conduit ( 3) for the material to be filtered can be closed at least substantially. On the upstream side of this closure means (30) a storage space (36 ) for material to be cleaned is connected to the upstream conduit (3). Within this storage space (36) a piston (38) is sealingly guided, which is reciprocable by a drive means and closes in its projected position the storage space (36) against the upstream conduit (3).
대표청구항▼
What is claimed is: 1. Apparatus for filtering viscous material comprising a device pressing the material to be cleaned from an upstream conduit of a supply housing towards a band-shaped screen which on its downstream side is supported by a perforated plate against a pressure of the pressed materia
What is claimed is: 1. Apparatus for filtering viscous material comprising a device pressing the material to be cleaned from an upstream conduit of a supply housing towards a band-shaped screen which on its downstream side is supported by a perforated plate against a pressure of the pressed material and is slidable crosswise a flow direction of the material to be cleaned for replacement of a soiled band section by a fresh band section, wherein a device for facilitating of this displacement is provided which device comprises a storage space for material to be cleaned, which storage space is connected to the upstream conduit, in which storage space a piston is sealingly guided, which piston is reciprocable by a drive means and in its projected position closes the storage space against the upstream conduit, the device for facilitating the adjustment of the screen comprising a closure means disposed on the upstream side of the screen, by which closure means the upstream conduit for the material to be filtered can be mainly closed, and which closure means, when seen in the flow direction of the material to be cleaned, is disposed between the storage space and the screen. 2. Apparatus according to claim 1, wherein the perforated plate or a plate carrier supporting the perforated plate is pressed against the supply housing by a clamping device, and wherein the screen conducted between the perforated plate or the plate carrier and the supply housing is sealingly supported in a clamping position of the clamping device. 3. Apparatus according to claim 2, wherein the clamping device is formed by hydraulic cylinders. 4. Apparatus according to claim 1, wherein the piston is a non-rotatable piston, and a front surface of the non-rotatable piston facing the upstream conduit is formed matching an inner wall of the housing of the screw, so that in a projected position of the piston its front surface is brushed over by volutions of the screw. 5. Apparatus according to claim 1, wherein the closure means is formed by a slide that is displaceable crosswise to the axis of the upstream conduit. 6. Apparatus according to claim 5, wherein a direction of motion of the slide is directed parallel to a direction of motion of the piston. 7. Apparatus according to claim 5, wherein the motions of the slide and of the piston are derived from a common drive means. 8. Apparatus according to claim 2, wherein the supply housing and the perforated plate or the plate carrier are displaceably arranged relative to each other in an axial direction of the upstream conduit. 9. Apparatus according to claim 8, wherein the clamping device serves for a relative displacement of the supply housing and of the perforated plate or of the plate carrier. 10. Apparatus according to claim 7 wherein the perforated plate or a plate carrier supporting the perforated plate is pressed against the supply housing by a clamping device, and wherein motions of the clamping device are also derived from the common drive means. 11. Apparatus according to claim 1, wherein the perforated plate on its side facing the screen comprises a flat depression. 12. Apparatus according to claim 1 wherein the device pressing the material towards the band-shaped screen includes a screw. 13. Process for replacement of a sieve section when filtering viscous material which is supplied under pressure within an upstream conduit to an upstream side of a band-shaped filter screen by means of a conveying device, a section of the screen being sealingly abutted to the outside during the filtration operation, whereas during the exchange of the screen section this sealing of the screen band is relieved and then the screen band is displaced crosswise to a flow direction of the material to be filtered until a soiled band section is replaced by a fresh band section, whereupon this fresh band section is again sealed to the outside, wherein during displacement of the screen band an inflow of the material to be filtered into a storage space connected to the upstream conduit is enabled, wherein a flow of the material to be filtered towards the screen band is mainly closed at a closure position, wherein substantially simultaneously therewith the inflow of the material to be filtered into the storage space is enabled at a location that is disposed upstream of the closure position, and wherein shortly after mainly closing the flow to the screen band, the sealing of the screen band is relieved and the screen is displaced, whereupon after the screen band has been sealingly abutted again, the flow of the material to be filtered towards the screen band is made free again, whereby the material that has entered the storage space is pressed out of the storage space and is again introduced into the flow of the material flowing towards the screen band at a location that is disposed upstream of the closure position. 14. A process according to claim 13 wherein the viscous material is supplied under pressure to the filter screen by a conveying device including a screw. 15. A process according to claim 13 wherein the flow of the material to be filtered towards the screen band is completely closed at the closure position.
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