초록 ▼

The heated roller of a heating device for warming a film strip comprising thermoplastic plastic is embodied to be manufactured less expensively, including its coating, even with a relatively large diameter. Moreover, it is lighter and can be brought to a more uniform temperature. This is accomplishe

The heated roller of a heating device for warming a film strip comprising thermoplastic plastic is embodied to be manufactured less expensively, including its coating, even with a relatively large diameter. Moreover, it is lighter and can be brought to a more uniform temperature. This is accomplished in that the heated roller comprises a plurality individual segments that can be produced, including all holes, webs and grooves, from an aluminum alloy in an extrusion-molding process. A special clamping strip connects adjacent individual segments together to form the roller.

대표청구항 ▼

1. A heated roller for warming a thermoplastic film, said roller having a tubular shape with an inner and outer surface and heating cartridges or passages for a heating medium positioned along the inner surface for the substantially uniform warming of the thermoplastic film positioned on the outer s

1. A heated roller for warming a thermoplastic film, said roller having a tubular shape with an inner and outer surface and heating cartridges or passages for a heating medium positioned along the inner surface for the substantially uniform warming of the thermoplastic film positioned on the outer surface, which has a nonstick coating between it and the thermoplastic film, and wherein said roller comprises a series of detachably connected one-piece elements of a light weight metal, each element having an inner surface and an outer non-stick coated surface and two longitudinal edges, each longitudinal edge has a centering device that comprises either a groove or a projection, which groove or projection cooperates with the corresponding projection or groove on an adjacent element to form a smooth surface between the adjacent elements, and a web, located on the inner surface of the element near the lateral edge, which cooperates with a web on an adjacent element to provide a detachable connection between the longitudinal edges of adjacent elements, wherein the elements collectively define the tubular shape and can be individually replaced with a new element and wherein the tubular structure is maintained when inserting the new element.2. The heated roller according to claim 1, wherein the centering device comprises a rectangular cross-section projection and a rectangular groove, wherein the projection and groove form the detachable connection between the two adjacent elements.3. The heated roller according to claim 1, wherein the centering device comprises a V-shaped cross-section projection, and a V-shaped groove, wherein the projection and groove form the detachable connection between two adjacent elements.4. The heated roller according to claim 1, further comprising inwardly directed radially extending bulbous protrusions, located on the inner surface of each of the elements, which bulbous protrusions position the heating cartridges or the heating medium to provide for the uniform warming of the thermoplastic film positioned on the nonstick coated outer surface.5. The heated roller according to claim 4, further comprising respective reinforcing webs disposed on the bulbous protrusions.6. Heated rollers according to claim 1, wherein the web protrudes inwardly beyond the inner surface and a connection arrangement for the connection of adjacent elements provided in the vicinity of the web.7. The heated roller according to claim 6, wherein the web has an indentation and the connection arrangement comprises a clamping strip, shaped to correspond to the indentation, surrounding two adjacent webs of two adjacent elements and engaging in the recesses of the two webs and clamping them together.8. The heated rollers according to claim 7, wherein the clamping strip comprises has two generally parallel legs connected by a web at one end, where the legs are held in the indentations with screws.9. The heated roller according to claim 8, wherein the clamping strip has at least one indentation for receiving a thread on the end face of the web.10. The heated roller according to claim 1, further comprising a groove cut into a region of an inside surface of a respective element for receiving a temperature sensor.11. The heated roller according to claim 10, wherein in addition to the groove for receiving the temperature sensor, at least one more groove having an undercut is provided for receiving an electrical current supply cable for the temperature sensor.12. The heated roller according to claim 1, wherein the nonstick coating comprises polytetrafluoroethylene.13. The heated roller according to claim 1, wherein the lightweight metal comprises aluminum or an alloy containing same.14. The heated roller according to claim 1, wherein the distance between the outer and inner surface of the elements is between about 10 to about 40 mm.15. The heated roller according to claim 1, wherein the series of connected elements includes six elements, which collectively define the tubular shape.