| 摘要 |
<p>1,254,832. Coating apparatus. DR. PLATE, G.m.b.H. 16 Jan., 1970 [18 Jan., 1969], No. 2294/70. Heading D1L. [Also in Division B6] Thermoplastic adhesive is applied to the upper surface of a moving web in rows of blobs by firstly coating the web 2 with the powdered adhesive, melting rows of areas of adhesive into blobs using a heated spiked roller 4 in conjunction with a second roller 5 and sucking up the excess powder using suction device 6 and a vibrator 7. The adhesive can be applied to the lower surface of the web by feeding the powder onto a continuous belt with a surface of polytetrafluoroethylene, melting areas of the powder into blobs of adhesive as above and using the spiked roller to transfer the blobs to the under surface of the web (Fig. 2). In this case the excess powder falls into a receptacle. In both embodiments the powder is fed from a hopper 1 and spread by skimming means 3. Adhesive can be applied to both upper and lower surfaces by combining the two embodiments.</p> |
