Another method of coating the back of a carpet is a transfer coating method. A layer of coating material is formed on a moving surface such as a roll, and the back of the carpet is pressed on wiped against the preformed layer to transfer the coating material from the moving surface to the carpet back. Adequate control of the amount of coating material transferred to the carpet is difficult to achieve because the layer of coating material on the roll cannot be transferred uniformly to the rough surface which is characteristic of a carpet back. Also, because of the inherently large contact area between the roll and the carpet back, the force exerted by the roll against the carpet is spread out over such a large area that there is insufficient pressure between them, making adequate penetration of the coating material into the pile yarn backs hard to achieve.
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