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AssigneeAmplas, Inc.
InventorsGiles R. Blaser, William J. Greely, Shaughn V. Hanley
Estimating the term…
A sideweld bag making has a reciprocating seal bar and a roller. Drive rolls upstream of the seal bar moves a web in steps over the roller and seal bar seals and severs the web to form bags. A cooling plate between the drive rolls and sealing bar includes a web strip and control air stream tube directs a special stream to engage the raising seal bar to strip the severed web therefrom and to engage the leading web edge as it moves through the seal bar unit. The stream source has closely spaced openings to form the stream; the width and character of which is controllable for selective web engagement. A second air tube is located beneath the web and directs the air stream over the sealing roller to further release the web during the movement of the web.
A film web control apparatus for stabilizing the leading edge of plastic web in a seal bar unit having a reciprocating element, said element having a heated tip adapted to engage said web and sever a portion therefrom, comprising a cooling plate unit adapted to be mounted adjacent said seal bar unit and having a cooling source coupled thereto, said plate unit having a bottom end located immediately above the web path, said plate unit having an elongated fluid passageway unit at the lower end of said plate, said passageway having a plurality of discharge openings directed outwardly therefrom and directed across the path of said heating element immediately above the web plane for directing a fluid stream over the heated tips and engaging web to prevent operative lifting of the leading edge of the severed web.
A stripping system for removal of a plastic web from a heated severing element in a side weld bag forming machine having a draw roll unit located immediately upstream of said severing element, comprising an elongated passageway unit mounted adjacent the upstream side of said severing element and the downstream side of said draw roll unit, said passageway unit including a discharge passageway establishing a fluid stream directed at a downward angle through the path of said severing element immediately above said web path, said fluid stream being established during the raising of the severing element from said web to engage the severing element and the web to effectively prevent lifting of the web.
In a bag forming machine moving a plastic web through a seal bar unit having a heated seal bar with an engaging end for severing the web to form individual plastic elements from the leading edge of the plastic web, a web control apparatus comprising a fluid stream unit located immediately upstream of the seal bar establishing a fluid stream across and downwardly of the engaging end of the heated seal bar to engage the heated seal bar and prevent substantial upward movement of the web and thereby maintain the web in position for movement through said seal bar unit.
An apparatus for forming successive plastic members from a plastic web, comprising
In an apparatus for forming successive plastic members from a plastic web, comprising:
Dependencies are inferred from the claim text.