DEVICE FOR ON ONE SIDE OR TWO SIDES OF AN ESSENTIALLY PAVING JOB MOVING upwards, SUCH AS PAPER PATH.

摘要

One or both sides of a paper web 1 are coated by passage upwardly through a coating chamber 7, the coating substance picked up by the web being evened out in a coating nip 4 formed by a flexible blade 2 and a back-up member 3. The coating substance 16 is supplied by a duct 13 to the coating chamber 7 which has a narrow slot 5 at its lower end. The width of the slot 5 is adjusted, by means of an adjustment member 10, so that it is wider than the thickness of the web 1, and the speed of the web and the viscosity of the coating substance 16 are chosen so that little or no coating substance 16 flows downwardly through the slot. Any coating substance that does flow down through the slot 5 is collected in a container 12 for recycling to the coating chamber 7. In one side coating, the web may be supported by a roll 15 (Figure 3) or a plate 17 (Figure 5). IMAGE