| 摘要 |
A method of, and apparatus for, applying a synthetic resin or plastic powder in a grate-shaped coating to web material wherein an upper layer is formed so as to coincide with and lie upon a lower layer applied by a relief-like structured printing roll. The upper layer is also formed by a relief-like structure printing roll. The powder for both layers, during its transfer into the spaces of the rolls, is brought to its sinter temperature, whereas the web material, before forming the lower layer, is heated approximately to the plasticizing temperature of the powder for this layer. The powder piles of the upper layer are placed upon those of the lower layer directly after transferring the latter to the web material.
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