Apparatus for treatment of the surface of a metal hollow body
First Claim
1. Apparatus for carrying out a process for treatment of the surface of a metal hollow body by thermal transfer of a design or motif which is printed on an auxiliary carrier by means of conventional printing processes and using sublimable dyestuffs onto a dyestuff-affinitive surface coating on the hollow body, said apparatus including:
- a turntable (11) arranged in a vertical plane, said turntable adapted to be driven in cycle steps;
a plurality of mandrels (19) arranged at an outer periphery of the turntable (11) perpendicularly to a face of the turntable, for holding hollow bodies (26);
holding fingers (24) co-operating with the mandrels (19);
a wrapping station (14) for wrapping auxiliary carriers (20) around the hollow bodies (26); and
at least one heating station (15) arranged downstream of the wrapping station (14) in the direction of rotation of the turntable (11), for initiating the thermal transfer process, the at least one heating station (15) comprising at least one induction coil (27) which passes over a respective one of the mandrels (19) by means of an axial stroke movement.
1 Assignment
0 Petitions
Accused Products
Abstract
Described is a process and apparatus for printing on metal hollow bodies therearound, in particular a can body, by means of thermal transfer printing, wherein color particles disposed on an auxiliary carrier are introduced under the application of heat and pressure by diffusion for example into a dyestuff-affinitive layer on the can body. The process and apparatus are such that the can body is briefly heated with the auxiliary carrier applied thereto and the transfer process which is iniated in that way is then brought to a conclusion at a preferably falling temperature. That provides visually sharp images on the can body, by suppression of the lateral migration of the dyestuff molecules during the transfer operation, to provide a satisfactory closed printing effect at the overlap region of the auxiliary carrier.
9 Citations
18 Claims
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1. Apparatus for carrying out a process for treatment of the surface of a metal hollow body by thermal transfer of a design or motif which is printed on an auxiliary carrier by means of conventional printing processes and using sublimable dyestuffs onto a dyestuff-affinitive surface coating on the hollow body, said apparatus including:
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a turntable (11) arranged in a vertical plane, said turntable adapted to be driven in cycle steps; a plurality of mandrels (19) arranged at an outer periphery of the turntable (11) perpendicularly to a face of the turntable, for holding hollow bodies (26); holding fingers (24) co-operating with the mandrels (19); a wrapping station (14) for wrapping auxiliary carriers (20) around the hollow bodies (26); and at least one heating station (15) arranged downstream of the wrapping station (14) in the direction of rotation of the turntable (11), for initiating the thermal transfer process, the at least one heating station (15) comprising at least one induction coil (27) which passes over a respective one of the mandrels (19) by means of an axial stroke movement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. Apparatus for carrying out a process for treatment of the surface of a metal hollow body by thermal transfer of a design or motif which is printed on an auxiliary carrier by means of conventional printing processes and using sublimable dyestuffs onto a dyestuff-affinitive surface coating on the hollow body, said apparatus including:
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a turntable (11) arranged in a vertical plane, said turntable adapted to be driven in cycle steps; a plurality of mandrels (19) arranged at an outer periphery of the turntable (11) perpendicularly to a face of the turntable for holding hollow bodies (26); holding fingers (24) co-operating with the mandrels (19); a wrapping station (14) for wrapping auxiliary carriers (20) around the hollow bodies (26); at least one heating station (15) arranged downstream of the wrapping station (14) in the direction of rotation of the turntable (11), for initiating the thermal transfer process, the at least one heating station (15) comprising at least one induction coil (27) which passes over a respective one of the mandrels (19) by means of an axial stroke movement; and the at least one induction coil (27) is in the form of a medium frequency coil.
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18. Apparatus for carrying out a process for treatment of the surface of a metal hollow body by thermal transfer of a design or motif which is printed on an auxiliary carrier by means of conventional printing processes and using sublimable dyestuffs onto a dyestuff-affinitive surface coating on the hollow body, said apparatus including:
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a turntable (11) arranged in a vertical plane, said turntable adapted to be driven in cycle steps; a plurality of mandrels (19) arranged at an outer periphery of the turntable (11) perpendicularly to a face of the turntable, for holding hollow bodies (26); holding fingers (24) co-operating with the mandrels (19); a wrapping station (14) for wrapping auxiliary carriers (20) around the hollow bodies (26); at least one heating station (15) arranged downstream of the wrapping station (14) in the direction of rotation of the turntable (11), for initiating the thermal transfer process, the at least one heating station (15) comprising at least one induction coil (27) which passes over a respective one of the mandrels (19) by means of an axial stroke movement; and the at least one induction coil (27) is in the form of a high frequency coil.
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Specification