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Publication numberUST966002 I4
Publication typeGrant
Application numberUS 05/778,926
Publication dateJan 3, 1978
Filing dateMar 18, 1977
Priority dateMar 23, 1976
Also published asCA1067324A, CA1067324A1, DE2712510A1, DE2712510B2, DE2712510C3, US4300892
Publication number05778926, 778926, US T966002 I4, US T966002I4, US-I4-T966002, UST966002 I4, UST966002I4
InventorsJohn Grover Barnes, Charles Robertson Murray
Original AssigneeImperial Chemical Industries Limited
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Plastics bags production
US T966002 I4
in the production of plastics bags, especially valved bags, from a web of plastics material by folding in the side margins of the web to form overlapping panels which are then longitudinally heat-sealed together for a major portion of one bag length, and then heat-sealing the web transversely and severing the web at intervals to produce individual bags, the two overlapping panels are heat-sealed together by forming two longitudinal seals which partially overlap to provide a forward longitudinal seal and a rear longitudinal seal with respect to the direction of travel of the web, the rear longitudinal seal of each bag being formed simultaneously with the forward longitudinal seal of the adjacent following bag. The apparatus comprises a pair of heat-sealing elements equipped for simultaneous operation and arranged for forming the rear seal in one bag and the forward seal in the following adjacent bag. The two elements may be a fixed distance apart, and at least one has suitably a hairpin shape.
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6571850May 1, 2001Jun 3, 2003V-Tek IncorporatedFloating anvil useable against a heat sealing shoe
US6739370Jan 21, 2003May 25, 2004V-Tek IncorporatedFloating heated packaging shoe
U.S. Classification493/203, 493/213
International ClassificationB31B19/64, B31B1/84, B31B19/60, B31B19/84, B31B23/60, B31B1/64
Cooperative ClassificationB29C66/8511, B31B2219/9058, B31B2219/603, B29C66/431, B29C66/3452, B29C66/1122, B29C66/81427, B29C66/244, B29C65/305, B29C65/18, Y10S493/929
European ClassificationB31B19/84, B31B19/64