Tensioning and sealing apparatus for a strap made of plastic

Details Tensioning and sealing apparatus for a strap made of plastic Tensioning and sealing apparatus for a strap made of plastic

1989-09-08

1991-10-22

Sipos, John

Package making

Partial cover application

Band or tube

53589, 53592, 100 33PB, 156495, 156580, B65B 1322

Patent

active

050583654

ABSTRACT:
A tensioning and sealing apparatus, for tensioning and sealing a strap made of a plastic passed around a packaged item, is disclosed. The apparatus includes a clamping device for securing a lower starting section of a plastic strap. The apparatus of the invention further includes a tensioning device for both tensioning the strap and for acting upon an upper section thereof. Upstream from the tensioning device, a friction welding device is provided which preferably includes two welding dies, which are movable relative to one another, for joining mutually overlapping regions of the strap. A cutting member is further provided, preferably arranged between the friction welding device and the tensioning device, for cutting through the upper section of the strap after the strap has been welded. A clean cut of the strap is accomplished by a strap tension holding device, which acts upon a section of the strap downstream of the friction welding device, after completion of the tensioning operation, which is used for maintaining a residual tensile stress (.sigma..sub.2) of the portion of the strap downstream of the welding device. This residual tensile stress (.sigma..sub.2) is to be less than the tensile stress (.sigma..sub.1) in the plastic strap at the end of the tensioning operation.

REFERENCES:
patent: 2982069 (1961-05-01), England
patent: 3269300 (1966-08-01), Billett et al.
patent: 3447447 (1969-06-01), Rutty
patent: 3566778 (1971-03-01), Vilcins
patent: 4050372 (1977-09-01), Kobiella
patent: 4820363 (1989-04-01), Fischer

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