Tenter clip cleaning method and apparatus
AssigneeE.I. du Pont de Nemours and Company
InventorsWilliam John Hommes, Albert White Forrest, Jr., Paul G. Jennings
Life of this patent
Estimating the term…
Abstract
A method and apparatus is disclosed for ejecting a loose film edge from a film stretching clip by directing a jet of fluid such as air through a channel in the clip and between adjacent clips at or before release of a film from the clip and also after release of the film.
Claims12
A method of ejecting a loose film edge from a moving film stretching clip of a simultaneous biaxial stretching device for a planar sheet of film, where the clips separate during stretching comprising:
- a) directing a jet of fluid at the edge of the film exposed between spaced clips and parallel to the plane of the film at a first position at or before release from the moving clip and at a second position after said release;
- b) releasing the film from the clip, thereby allowing the jet of fluid to eject the loose film edge from the clip.
A method of ejecting a loose film edge from a moving film stretching clip of a simultaneous or sequential stretching device for a planar sheet of film, comprising:
- a) directing a jet of fluid directly at the edge of the film and parallel to the plane of the film at a first position at or before release from the moving clip and at a second position after said release;
- b) providing a channel on a body member on the moving clip, the channel aligned with a gripping support on the clip and aligned to receive said jet of fluid;
- c) directing said jet of fluid through said channel on said clip;
- d) releasing the film from the clip at the gripping support, thereby allowing the jet of fluid to eject the loose film edge from the clip.
An apparatus for ejecting loose film edges from a moving film stretching clip of a simultaneous biaxial film stretching device for a planar sheet of film, where the clips separate during stretching comprising:
- a track member for guiding the plurality of film stretching clips along a path as each clip moves through a stretching device;
- means adjacent said path of said plurality of clips for providing a flow of fluid along said path, said flow directed at the edge of the film and aligned parallel to the plane of the film;
- a source of pressurized fluid in communication with said means for providing a flow of fluid.
An apparatus for ejecting loose film edges from a moving film stretching clip of a stretching device for a planar sheet of film, comprising:
- a plurality of film stretching clips each having a passage extending straight through a body member and aligned with a film gripping support in said clip, the passage being parallel to the intended plane of a planar film gripped by each said clip;
- a track member for guiding the plurality of film stretching clips along a path as each said clip moves through a stretching device;
- means adjacent said path of said plurality of clips for providing a flow of fluid along said path and aligned with the passage in each clip;
- a source of pressurized fluid in communication with said means for providing a flow of fluid.
Dependencies are inferred from the claim text.