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US 12,679,053 B2Granted
Production of polymeric film
AssigneeInteplast Group Corporation
InventorsJoseph Aguire, Scott Coffey, Rafael E. Bayona P., Jiangshan Sun
Life of this patent
Estimating the term…
Abstract
A method and system for production of polymeric film. Radiant heat is applied in a controlled manner to the film to control the heating of the film so that desirable processing, such as annealing may be carried out.
Claims19
A method of making a biaxially oriented polymer film comprising:
- feeding a film of polymer material to material handling rollers, the film having a length, a width, longitudinal edge margins and a central portion bounded by the longitudinal edge margins;
- passing the film from one of the material handling roller to the next through a heating zone located between the one material handling roller and the next material handling roller;
- applying heat to the film in the heating zone such that more heat is applied to the longitudinal edge margins than to the central portion of the film;
- stretching the film between the material handling rollers in the heating zone.
1 more element
A method of of making a biaxially oriented polymer film comprising:
- feeding a film of polymer material to material handling rollers, the film having a length, a width, longitudinal edge margins and a central portion bounded by the longitudinal edge margins;
- passing the film from one of the material handling roller to the next through a heating zone;
- applying heat to the film in the heating zone;
- wherein passing the film through the heating zone comprises moving the film in a first direction through a first portion of the heating zone and moving the film in a second direction through a second portion of the heating zone, wherein the second direction is different than the first direction.
1 more element
A method of making a biaxially oriented polyethylene film comprising:
- feeding a film of polyethylene material to material handling rollers, the film having a length, a width, longitudinal edge margins and a central portion bounded by the longitudinal edge margins;
- passing the film from one of the material handling roller to the next through a heating zone in a feed direction;
- applying radiant heat to the film in the heating zone including plural heating sections positioned in different locations along the feed direction;
- sensing a temperature of the film at locations in the heating zone and collecting temperature data;
- independently controlling the heating sections using the temperature data to applying different amounts of heat to the film as the film passing through different ones of the heating sections.
2 more elements
A heating system for producing polymer film, the heating system comprising:
- a frame forming a passageway sized and shaped to receive a web of film into and through the frame, the web of film having longitudinal edge margins and a central portion between the longitudinal edge margins;
- heating units arranged along a length of the passageway for applying radiant heat from the heating units to the film passing through the passageway, the heating units being independently controllable for applying different amounts of heat to different portions of the passageway along the length of the passageway, and least some of the heating units being positioned for applying heat preferentially to the longitudinal edge margins of the film;
- each of the heating units include heating elements which are elongate along a heating element axis, the heating units positioned for applying radiant heat preferentially to the longitudinal edge margins being arranged so that the heating element axis is generally parallel to the longitudinal edge margin of the film.
A heating system for producing polymer film, the heating system comprising:
- a frame forming a passageway sized and shaped to receive a web of film into and through the frame, the web of film having longitudinal edge margins and a central portion between the longitudinal edge margins;
- heating units arranged along a length of the passageway for applying radiant heat from the heating units to the film passing through the passageway, the heating units being independently controllable for applying different amounts of heat to different portions of the passageway along the length of the passageway, and least some of the heating units being positioned for applying heat preferentially to the longitudinal edge margins of the film;
- wherein the passageway includes a first portion and a second portion, the first and second portions being generally side-by side.
Dependencies are inferred from the claim text.