Patent GB-1179072-A (GB)
Title: Method and apparatus for applying a coating onto tubular articles.
Inventor: DEMIN ALEXANDR NIKOLAEVICH
IPC: B29D23/00
Filed: 1968-05-10
Abstract: 1,179,072. Coating apparatus. TSENTRALNOE PROEKTNO-KONSTRUKTORSKOE I TEKHNOLOGICHESKOE BJURO LEGPROM MLP RSFSR. 10 May, 1968, No. 22244/ 68. Heading B2L. The interior of a tubular article is coated by coiling the article into a helix having a substantially horizontal axis, introducing liquid into the article at one end of the helix, and rotating the helix about its axis to advance the liquid to the other end of the helix. Preferably the helix is tapered to provide for uniform coating. If the helix is parallel the speed of rotation is progressively decreased. As shown, fabric hoses 8 are helically wound on an open mesh truncated core 7 mounted between end members 9, 10 carried by a horizontal shaft 30 journalled on end supports 6. The ends of the hoses at the wider end of core 7 are secured to the outlets of respective multi-way corks 11 carried by member 9. Each cork has a body 14 journalling a tapered plug 16. Body 14 is formed with two pairs of axially-spaced radial passages 15. Plug 16 is formed with an axial channel 18, an annular end cavity 20, and radial passages 19 adapted to connect channel 18 and cavity 20 to the respective pairs of passages 15. The end of shaft 30 adjacent member 9 is formed with four concentric axial passages each of which connects an outer stationary hollow ring 31 with a similar inner ring. Each of the latter is connected by ducts to a similar one of the passages of all the cocks 11. Three of the outer rings are connected by ducts 13 to containers 1, 2, 3 for latex, calcium chloride solution and water. The fourth ring is connected to a compressed air duct 48. The arrangement is such that calcium chloride or water may be supplied via the upper pair of passages 15 to the axial channel 18, while latex and air may be supplied via the lower pair of passages 15 to the cavity 20. A rod 22, passing axially through channel 18 and slidably keyed to plug 16 to turn therewith when plug 16 is turned by a lever 28, is spring biased to engage a valve member 23 thereon with a seating at the end of channel 18 when latex is being supplied to cavity 20. A bar 24, projecting radially from rod 22, engages a cam groove 21 formed in body 14 to open valve 23 when calcium chloride or water are being supplied to channel 18. The ends of the hoses at the narrower end of core 7 are cocks 11 mounted adjustably on member 10 in the axial direction of core 7 and connected by channels in shaft 30 to drain surplus latex and calcium chloride into respective containers 4, 5. Shaft 30 is rotated by a drive connected by variable speed gearing to an endless chain 42 coupled to a trolley 40 mounted on rails 41 parallel to shaft 30. Hoses 8, initially coiled on drums 45 carried by trolley 40, are wound on cone 7 by connecting the free ends thereof to the cocks 11 on member 9 and rotating shaft 30, the speed of chain 42 being adjusted in accordance with the length of the hoses to position the opposite ends of the latter adjacent the cooks 11 on member 10. A motor 47, mounted on trolley 40, is adapted to rotate the drums 45 for re-winding the treated hoses thereon. When the respective ends of the hoses are connected to the cocks 11 shaft 30 is rotated, and the levers 28 are then automatically actuated by engagement with fixed cam surfaces. The arrangement is such that the hoses are initially inflated and latex, calcium chloride and water are supplied in succession thereto. When the hoses are finally drained, the ends are detached from the cocks 11 on member 9 and are clamped to a ring 36. Air is then blown through the hoses from the opposite ends and shaft 30 is rotated to dry the hoses under the influence of heaters 35 located inside and outside core 7.