Method of manufacturing tubular film
AssigneeCanon Kabushiki Kaisha
InventorsKazutaka Takeuchi, Shoichi Shimura
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Abstract
It is an object of this invention to provide a tubular film having a high film thickness uniformity and suitable for a fixing film of an image forming apparatus. To achieve this object, a thermoplastic sheet film is so wound that the leading and trailing ends of the film partially overlap each other to form overlapping portions, and the wound film is heated between a core member and a tubular molding member.
Claims68
A tubular film, wherein a thermoplastic sheet film is wound so that leading and trailing ends of said sheet film partially overlap each other to form overlapping portions, and the overlapping portions are connected by heating said wound sheet film for a predetermined time.
A tubular film, wherein a first thermoplastic sheet film is wound so that leading and trailing ends form overlapping portions, and a second thermoplastic sheet film is wound on said first sheet film so that leading and trailing ends form overlapping portions, thereby forming a tubular body from said first and second sheet films, and
- the overlapping portions of said first and second sheet films are connected by heating said tubular body.
A tubular film, wherein a thermoplastic sheet film is wound to form a wound body so that leading and trailing ends of said film overlap each other, and said wound body is covered with a thermoplastic tube and heated, thereby connecting the overlapping portions of the leading and trailing ends and forming a tubular body.
A tubular film, wherein a thermoplastic sheet film is wound on a non-thermoplastic tube, leading and trailing ends of said film are partially overlayed on each other to form a multilayered tubular body, and said tubular body is heated to connect the overlapping portions.
A multilayered tubular body, wherein a non-thermoplastic tube and a thermoplastic tube are overlayed on each other to form a multilayered tubular body, and said multilayered tubular body is heated.
A method of manufacturing a tubular film, comprising the steps of:
- winding a thermoplastic sheet film on a columnar member, overlaying leading and trailing ends of said film on each other, and fitting a tubular molding member on said wound film;
- and
- connecting the overlapping portions of said film by heating at least said film, thereby forming said sheet film into a tubular film.
A method of manufacturing a tubular film, comprising the steps of:
- winding a thermoplastic sheet film 5 to 300 μm in thickness on a columnar member so that leading and trailing ends of said film partially overlap each other;
- covering said wound film with a tubular molding member whose inner diameter is larger by not less than 15 μm than an outer diameter of said columnar member;
- and
- connecting the overlapping portions of said film by holding at least said film within a temperature range from a melt temperature to a decomposition thereof temperature for a predetermined time.
A method of manufacturing a tubular film, comprising the steps of:
- winding a thermoplastic sheet film on a columnar member, overlaying leading and trailing ends of said film on each other, and fitting a tubular molding member on said wound film;
- and
- placing said film, said columnar member, and said tubular molding member in a radio-frequency induction heating device and heating said sheet film, thereby connecting the overlapping portions of the leading and trailing ends of said film.
A method of manufacturing a tubular film, comprising the steps of:
- winding a first thermoplastic sheet film a plurality of number of times on a columnar member so that leading and trailing ends partially overlap each other;
- winding a second thermoplastic sheet film a plurality of number of times on said wound first sheet film so that leading and trailing ends partially overlap each other;
- covering said first and second films with a tubular molding member;
- and
- connecting the overlapping portions by heating said first and second films to a temperature, at which the overlapping portions are connected, for a predetermined time, thereby forming a multilayered tubular film.
A method of manufacturing a tubular film, comprising the steps of:
- winding a thermoplastic sheet film on a columnar member so that leading and trailing ends of said film partially overlap each other;
- fitting a thermoplastic tube on said sheet film;
- fitting a tubular molding member on said thermoplastic tube;
- and
- connecting the overlapping portions by heating at least said sheet film within a temperature range from a melt temperature to a decomposition temperature thereof.
A method of manufacturing a tubular film, comprising the steps of:
- fitting a non-thermoplastic tube on a columnar member;
- winding a thermoplastic sheet film on said tube so that leading and trailing ends of said film partially overlap each other;
- fitting a tubular molding member on said sheet film;
- and
- connecting the overlapping portions by heating at least said sheet film within a temperature range from a melt temperature to a decomposition temperature thereof.
A method of manufacturing a tubular film, comprising the steps of:
- fitting a non-thermoplastic first tube on a columnar member;
- fitting a thermoplastic second tube on said first tube;
- fitting a tubular molding member on said second tube;
- and
- connecting the overlapping portions by heating at least said sheet film within a temperature range from a melt temperature to a decomposition temperature thereof.
An apparatus for manufacturing a tubular film, comprising:
- a columnar member on which a thermoplastic sheet film is wound so that leading and trailing ends of said film partially overlap each other;
- a tubular molding member in which said film wound on said columnar member is fitted;
- and
- heating means for heating at least said film,
- wherein a tubular film is formed by connecting the overlapping portions of said film by heating said film by said heating means.
A film for a fixing device of an image forming apparatus, wherein said film is formed by thermally connecting two ends of a thermoplastic sheet film, and toner on an image carrier is fixed by pressurizing the toner between said film and a press member.
A film for a fixing device of an image forming apparatus, wherein said film is a multilayered tubular film formed by connecting two end portions of each of first and second thermoplastic sheet films, and toner on an image carrier is fixed by pressurizing the toner between said film and a press member.
A film for a fixing device of an image forming apparatus, wherein said film is a multilayered tubular film formed by connecting two end portions of a thermoplastic sheet film on an outer or inner surface of a thermoplastic tube, and
- toner on an image carrier is fixed by pressurizing the toner between said film and a press member.
A film for a fixing device of an image forming apparatus, wherein said film is a multilayered film formed by combining thermoplastic and non-thermoplastic tubes, and
- toner on an image carrier is fixed by pressurizing the toner between said film and a press member.
A fixing device of an image forming apparatus, wherein a tubular film is formed by connecting two end portions of a thermoplastic sheet member, said tubular film is driven in the form of a closed loop by pressing said film against a press roller, and a carrier which carries toner is inserted between said tubular film and said press roller, thereby fixing the toner.
A conveyor belt, wherein a thermoplastic sheet film is wound into a cylindrical film so that leading and trailing ends of said film overlap each other to form overlapping portions, molding members are arranged on inner and outer circumferential surfaces of said cylindrical film, and said film is formed into a tubular belt by heating said film and said molding members.
A conveyor device for an image forming apparatus, wherein a thermoplastic sheet film is wound into a cylindrical film so that leading and trailing ends of said film overlap each other to form overlapping portions, molding members are arranged on inner and outer circumferential surfaces of said cylindrical film, said film is formed into a tubular belt by heating said film and said molding members, and said tubular belt is rotated by a driving roller and a press roller.
A fixing device for an image forming apparatus, wherein a thermoplastic sheet film is wound into a cylindrical film so that leading and trailing ends of said film overlap each other to form overlapping portions, molding members are arranged on inner and outer circumferential surfaces of said cylindrical film, said film is formed into a tubular belt by heating said film and said molding members, said tubular belt is rotated by a driving roller and a heating roller, and image fixing is performed by passing an image transfer medium between said heating roller and said tubular belt.
A tubular film, wherein a thermoplastic sheet film is wound on a columnar member, leading and trailing ends of said film are butted against each other, a tubular molding member is fitted on said wound film, and the butted portions of said film are connected by heating at least said film, thereby forming said sheet film into a tubular film.
A method of manufacturing a tubular film, comprising the steps of:
- winding a thermoplastic sheet film on a columnar member;
- butting leading and trailing ends of said film against each other;
- fitting a tubular molding member on said wound film;
- and
- connecting the butted portions of said film by heating at least said film, thereby forming said sheet film into a tubular film.
Dependencies are inferred from the claim text.