Treatment apparatus has up-stream rollers 2 and down-stream rollers 3. Between the rollers are provided a pair of upper and lower treatment zone plates 4,5, spaced by a gap 6 through which sheet material to be treated can be passed. The plates have grooves 9 occupied by strips defining up- and down-
Treatment apparatus has up-stream rollers 2 and down-stream rollers 3. Between the rollers are provided a pair of upper and lower treatment zone plates 4,5, spaced by a gap 6 through which sheet material to be treated can be passed. The plates have grooves 9 occupied by strips defining up- and down-stream even slots 14,15 for flow of treatment liquid into the gap 6. The ends of the upper plate 4 are smoothly rounded at 37. When sheet material is fed into the gap flow occurs on top of the sheet and up over the rounded edge of the plate. Then it flows sideways off the top of the plate without flowing over the top of the upper rollers.
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1. An apparatus for the liquid treatment of sheet material passing through the apparatus, the apparatus comprising: upper path defining plate and lower path defining plate, the plates being separated by a gap between opposed faces of the plates to provide a treatment zone, the gap and the plates hav
1. An apparatus for the liquid treatment of sheet material passing through the apparatus, the apparatus comprising: upper path defining plate and lower path defining plate, the plates being separated by a gap between opposed faces of the plates to provide a treatment zone, the gap and the plates having: opposed faces of the plates,width transverse to a length of a generally horizontal sheet path between the plates,length along the sheet path from up-stream edges of the plates to their down-stream edges,at least one slot for treatment liquid injection in the opposed faces,a plenum chamber upstream on each plate upstream of at least one slot andopposed edge grooves in the opposed faces extending in a transport direction;the gap having edge closures of the gap, wherein the edge closures of the gap[s] are at least substantially along the length of the sheet path within the plates and delimiting the width of the gap, the edge closures of the gap being: edge strips let into the edge grooves, the edge strips and the edge grooves being sized to define the separation of the plates;means for transporting a sheet to and from the gap, in the transport direction giving sense to the terms up- and down-stream as used herein, and including: pairs of upper and lower in-feed and out-feed rollers at respective up- and down-stream edges of the plates;means for injecting treatment liquid to the gap intermediate its up- and down-stream ends for flow in the gap both up- and down-stream of the transport direction and including: at least one nozzle means in each of the plates at their opposed faces andmeans for pumping liquid to each of the nozzle means to fill the gap both up- and down-stream from at least one of the at least one slot to their up- and down-stream edges in normal use; wherein the treatment zone in the gap between the plates has: an up-stream portion up-stream of the nozzle means anda down-stream portion down-stream of the nozzle means, the two portions being substantially equal in their respective lengths from the upstream edge of the plates to the nozzle means and from the nozzle means to the downstream edge of the plates, whereby the liquid flows substantially equally to both edges and the sheet material is exposed to the liquid for treatment substantially equally in both portions; and wherein the treatment apparatus includes: rounded edges of the upper plate at its respective up- and down-stream ends, the rounding of the ends providing a smooth flow contour for liquid onto the top of the upper plate at its ends in the presence of sheet material between both the plates and either of the in-feed or out-feed rollers, the sheet material damming flow of liquid on top of the sheet material from passing between the lower roller and the lower plate; anda flow path from the top of the upper plate to a drain at edges of the plates. 2. Treatment apparatus as claimed in claim 1, wherein the nozzle means are transverse rows of bores in the plates. 3. Treatment apparatus as claimed in claim 1, wherein the nozzle means are transverse slots in the plates. 4. Treatment apparatus as claimed in claim 3, wherein a single transverse slot is provided in each upper path defining plate and lower path defining plate. 5. Treatment apparatus as claimed in claim 3, wherein two transverse slots are provided in each of the plates. 6. Treatment apparatus as claimed in claim 3, wherein the respective transverse slots in the upper path defining plate and lower path defining plate are exactly opposite each other. 7. Treatment apparatus as claimed in claim 3, wherein the respective transverse slots in the upper path defining plate and lower path defining plate are staggered from one plate to the other. 8. Treatment apparatus as claimed in claim 3, wherein the transverse slots are provided with a component of direction such that an up-stream one points up-stream and a down-stream one points downstream. 9. Treatment apparatus as claimed in claim 3, wherein the transverse slots are all directed normally to their plates. 10. Treatment apparatus as claimed in claim 3, wherein each transverse slot is provided as a machining from one side of the plates to the other. 11. Treatment apparatus as claimed in claim 5, wherein the transverse slots are provided by: transverse slot grooves in the opposed faces of the plates andstrips let into the transverse slot grooves the transverse slots being defined by up- and down-stream clearances between each strip and its transverse slot grooves. 12. Treatment apparatus as claimed in claim 11, wherein each strip is supported centrally to a piece of upper and lower plates remaining from formation of the transverse slot grooves in the plates. 13. Treatment apparatus as claimed in claim 12, including a flow passage to the transverse slots in the form of a series of drillings through the plates. 14. Treatment apparatus as claimed in claim 13, wherein each series of drillings comprises two lines of the drillings, one in communication with one of the clearances and the other in communication with the other of the clearances. 15. Treatment apparatus as claimed in claim 1, wherein the lower plate is castellated at edges opposite the pairs of upper and lower in-feed and out-feed rollers. 16. Treatment apparatus as claimed in claim 15, wherein the plates include runnels extending towards their slots from the castellations. 17. Treatment apparatus as claimed in claim 16, wherein the runnels taper outwards towards the castellations from their ends nearer the slots. 18. Treatment apparatus as claimed in claim 1, wherein the flow path to the drain includes edge slots in the plates outwards of the edge grooves. 19. Treatment apparatus as claimed in claim 1, wherein the upper path defining plate is thicker at its rounded edges than at its center, whereby liquid welling up over the edges is directed to flow sideways off the plates. 20. Treatment apparatus as claimed in claim 1, incorporated in a treatment machine having a pair of elevated chassis rails supported on legs, the treatment apparatus being carried on the chassis rails. 21. Treatment apparatus as claimed in claim 18, further comprising stiffening panels between a pair of respective legs at equivalent positions along chassis rails and close fitting liquid treatment tanks between the pair of respective legs spaced along the chassis rails, the panels and the tanks stabilising the pair of respective legs for support of the treatment apparatus. 22. Treatment apparatus as claimed in claim 18, including: a plurality of U ribs extending between and supported on rails,shells fixed to and extending between the ribs andinternal walls extending within the shells in lines from one rib to the next on opposite sides of the shells, the upper path defining plate and lower path defining plate and the in- & out-feed rollers being supported on the internal walls. 23. Treatment apparatus as claimed in claim 20, including: a drive shaft extending on the outside of one line of internal walls,driving bevel gears mounted at spaced positions along the shaft,driven bevel gears in mesh with the driving gears and carried on shafts extending through the internal walls for bearing support and drive of a respective one of each of the pairs of feed rollers andmeans for driving the drive shaft. 24. Treatment apparatus as claimed in claim 21, including: upright slots passing through an inner wall at the positions of the feed rollers,bearing supports for the feed rollers engaged in the upright slots, the bearing supports having: through bores for support of lower ones of the feed rollers driven by the bevel gears andinner side, upright extending slots for location of shafts of upper ones of the feed rollers. 25. Treatment apparatus as claimed in claim 22, including additional guide rollers parallel to the feed rollers and driven therefrom. 26. Treatment apparatus as claimed in claim 18, including duplicated: upper path defining plates and lower path defining plates,edge closures,transport means,treatment liquid injection means, all as per claim 1, together with transverse dividers between the upper path defining plate and lower path defining plates and the transport means. 27. Treatment apparatus as claimed in claim 18, including other stations up- and/or down-stream of at least one treatment station, the other stations being washing stations and/or drying stations and/or degreasing stations and/or lacquering stations, the other stations each having their own pairs of upper and lower in-feed and out-feed rollers. 28. Treatment apparatus as claimed in claim 25, wherein a washing station is comprised of upper and lower tubes spaced above and below the sheet path and having staggeredly opposed slits and means for supplying washing liquid into the tubes. 29. Treatment apparatus as claimed in claim 25, wherein a drying station is comprised of upper and lower tubes spaced above and below the sheet path and having a series of drillings. 30. Treatment apparatus as claimed in claim 29, wherein the drillings face upstream and the upper and lower tubes are stepped at the drillings to provide a step, having a bigger gap between them upstream of the step than downstream. 31. Treatment apparatus as claimed in claim 18, wherein a treatment station has a condensation shield arranged over at least the upper path defining plate to allow condensation of treatment liquid and its return to a station's drain. 32. Treatment apparatus as claimed in claim 18, including: upper extensions of an internal wall,covers extending between the upper extensions andapertures in the upper extensions for passage of ventilation over at least one station within the covers. 33. Treatment apparatus as claimed in claim 18, wherein the lower in-feed rollers of a treatment station and of at least one washing station, where provided, has a liquid removal wiper wiping against its underside.
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