Patent GB-1023638-A (GB)
Title: Apparatus for continuous treatment of porous webs
IPC: D06N7/00
Filed: 1964-08-19
Abstract: 1,023,638. Textile treating apparatus. DEUTSCHE LINOLEUM-WERKE A.G. ZWEIGNIEDERLASSUNG MAXIMILLANSAU. Aug. 19, 1964 [Aug. 24, 1963], No. 33958/64. Heading D1L. Apparatus for the continuous treatment of a web 5 by gaseous or liquid media comprising a rotary sieve-drum 1 and outer chambers 3 extending respectively over a drum sector, open towards the drum surface, spaced therefrom a distance corresponding to the thickness of the web 5 which engages the outer surface of the drum 1 and connected to feed conduits 33 for the treatment media, is characterized in that to each chamber 3 is allocated a chamber 2 in the drum interior and formed by walls 2<SP>1</SP> stationary relative to the drum 1 and sealed against the inside drum surface, the separating walls of the chambers 2, 3 being mutually aligned. The foraminated drum 1 is driven by a gear ring 11 provided thereon meshing with a driven pinion 12. The web 5 passes around the drum 1, over a deflecting roll 6 and a further guide roll and between two pull rolls 7 driven with a speed equal to the circumferential speed of the drum 1. The chambers 3 are closed at opposite ends by rolls 32 each carried by a pair of lugs on a wall 35, Fig. 2, situated between walls 31, the roll 32 being urged into contact with the drum surface by a spring 38. Sealing strips 37 are arranged between the walls 31, 35. The shafts of the rolls 32 may extend outside the chambers 3 and may each be driven with substantially the same circumferential speed as the drum 1. A scraper 39 pivoted at 40 to the outer wall of each chamber 3 may be provided and is pressed by a spring 47 into engagement with the roll 32. Alternatively, a resiliently-mounted scraper blade may be provided in a central slot in the wall 35. Additional rolls 4, Fig. 1, may be provided in the chambers 3 and are resiliently pressed against the drum surface. The walls of the chambers 2, 3 are stationarily mounted on a support frame (not shown). Treatment fluids after passing through the web 5 are discharged from the chambers 2 through conduits 23 connected to pumps (not shown). Sealing strips or brushes 21 on the walls 2<SP>1</SP> engage the drum surface. Rollers 42, Fig. 2, support the drum for rotation about its axis. The chambers 2 are connected to a suction pump (not shown) through conduits 24 to maintain the interiors thereof at a pressure less than atmospheric. Heating means 25, 34 may be provided in the chambers 2, 3, respectively, to maintain a desired viscosity of the impregnating fluid. The heating means may consist of electrical heating coils or tubes through which a heating fluid is circulated. The web 5 is preferably fed through the apparatus together with a foraminous band 8 guided over rolls 9, the rolls 32, 4 engaging the outer surface of the band 8. The band 8 may be cleaned by means 10 which may include water or a steam jet impinging thereon and/or cleaning brushes. In a further embodiment, the web 5 is sandwiched between two foraminous bands 8. In modifications, two superimposed webs are fed through the apparatus and a band of a reinforcing fabric or elongated reinforcing elements may be fed into the apparatus to increase the tear strength of the finished product.