| 摘要 |
996,809. Seaming non-metallic sheet material. J. CLELAND & SON Ltd. Oct. 5, 1961 [July 5, 1960], No. 23398/60. Heading B5K. Apparatus for sealing together contiguous components coated or impregnated with a sealing medium comprises at least one sealing member in which high frequency heat is generated and means for conveying the contiguous components past the or each sealing member. In one embodiment, Fig. 1, a non-ferrous metal, preferably brass, roller 13 is supported by integral spindles 14, 15 in nylon bearing blocks 10. A flanged wheel 16 is mounted on the spindle 14 and is located within a bearing formed in a synthetic resin member 17 and a non-ferrous metal, preferably aluminium, member 18. A non-ferrous metal pressure plate 22 supports the components passed beneath the roller 23 to be sealed. Radio-frequency heat is supplied either continuously or intermittently to the member 18 through a copper foil 23 secured thereto by a piece 20 or by coaxial cable connected to the supply. The plate 22 may be replaced by a mandrel. In a modification, Fig. 4, a hood 24 is secured to the block 10 through slots 27 and extends over the roller 13 to form an air-gap 28, the hood 24 and the roller 13 acting as a capacitor and variation in the gap 28 causing variation in impedance. In a further modification, the plate 22 is replaced by a second roller assembly. The heat may be generated in the roller 13 by contact by carbon brushes. The roller 13 may be replaced by a number of transverse sections or there may be a series of spaced roller assemblies or may be replaced by discs. The roller 13 may be coated with resilient silicone rubber, may be driven or freely rotatable, and may, together with hood 24, be formed of nylon covered with brass. The components to be sealed may be delivered to and from the apparatus by conveyers and the passage therecf may actuate a switeh. The components may pass between pressure rollers after being heated. |
