Improvements in the Heatsealing of Webs, and Bags Produced Thereby

1,156,849. Seaming non-metallic sheet material. PAKCEL CONVERTERS Ltd. 1 Nov., 1967 [7 Dec., 1966], No. 54778/66. Heading B5K. [Also in Division B8] The welds S forming the sides of a bag have curved ends 5, convex to the mouth 4 of the bag, to reduce the tendency for the weld to peel. The weld is f...

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Bibliographische Detailangaben
Hauptverfasser:	WILLIAM GEORGE CALLON, EDWARD HEWARD
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNERANALOGOUS TO PAPER MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN AMANNER ANALOGOUS TO PAPER PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUSTO PAPER
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Zusammenfassung:	1,156,849. Seaming non-metallic sheet material. PAKCEL CONVERTERS Ltd. 1 Nov., 1967 [7 Dec., 1966], No. 54778/66. Heading B5K. [Also in Division B8] The welds S forming the sides of a bag have curved ends 5, convex to the mouth 4 of the bag, to reduce the tendency for the weld to peel. The weld is formed by a welding bar (2) (Fig. 1, not shown) removably held by such screws (3) in a head containing a heater. The welds may be curved, instead of straight as shown, and the arounding of the end may extend across only part of the width of the weld, and may form an arc of a circle between a quarter and a half a circle. Where the bag is formed from a single sheet folded in two only one such weld will be provided.