| 摘要 |
1,094,783. Sealing plastics bags. BADISCHE ANILIN- & SODA-FABRIK A.G. March 26, 1965 [March 28, 1964], No. 12861/65. Heading B8C. The open end of tubular plastics material (forming a bag) is trimmed straight and a closure strip is folded longitudinally into V- shape and placed over the open end, the inner surface of the strip and the outer surfaces of the end adjacent the strip are heated and pressure is applied to unite the strip with and close the end. Bags 73 are fed in between rollers 45-48 around which run conveyer belts 38, 39, 53, 54, the bag mouth being trimmed by rotary cutters 37, 37a, so that the cut-off piece 52 is laterally discharged by the uppermost conveyers 53, 54 and the trimmed bag continues to advance to beneath a flat closure strip 56 fed from a roll 55 around a guide roll 57 and brought into V-shape by wires 58. Two opposed wheels 59, 60 (59 being driven and 60 being mounted on a shaft 70 movable eccentrically about a shaft 14) grip together the strip and the trimmed bag and convey them to a heat sealing station, the eccentrically mounted shaft 70 being moved by a contact (not shown) operating when the leading edge of the bag reaches a point 74. Heated copper wedges 61, 61a, which are pivoted about horizontal axes (63), (63a), Fig. 4 (not shown), and rest normally in a lower position under the weight of heating coils (75), (75a), are raised by magnets (64), (64a) so that they contact the outer faces of the mouth of the bag and the two inner faces of the strip at the same time, a shaped metal sheet 65 serving as a support during the contact with the heating wedges. The strip is then gripped and pressed together by two spring-mounted wheels 67, 68 and conveyed out of the apparatus. A scissor member 76 cuts the closure strip immediately behind the closed bag. The seam may be air cooled by means of a blower.
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