Transfer printing apparatus

Details Transfer printing apparatus Transfer printing apparatus

1988-03-07

1990-03-20

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

Automatic and/or material-triggered control

1564771, 156542, 156567, B32B 3100, B65H 2600, B42C 900, B65C 300

Patent

active

049098888

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a transfer printing method for transferring a printing layer on a synthetic resin film surface, by heating and pressing, to a drum of a container whose drum is cylindrical, particularly to a drum of a thin-wall container.
In the conventional transfer of this kind, a transfer sheet of paper is supplied between a heat roller and a cylindrical container with a printing layer of the surface directed toward the container, the transfer paper together with the container is pressed against the heat roller, and the container is rotated with respect to a transfer film by utilization of rotation of the heat roller. In such a transfer as just mentioned, a number of containers cannot be continuously treated or process by a single heat roller, and when the speed is increased in order to enhance the processing ability, a transfer slippage occurs. Moreover, since a heater is used as a heating source, if operating time is prolonged, the temperature of the heat roller rises, and where the base of a transfer paper is a synthetic resin film, an elongation occurs due to overheating, leading to a slippage in transfer or melting, etc. When temperature is controlled in order to prevent the overheat, the temperature of the roller surface materially lowers, resulting in insufficient printing of the printing layer after transfer, which leads to a problem such that the printing layer transferred to the container is peeled off due to a slight friction. Further improvement has been required to make in order to continuously obtain products in a good transfer condition.
Under these circumstances as noted above, the present inventors have repeatedly studied on prior method and apparatus, and as the result, found that the causes of the above-described problems resulted from unstableness of heating temperature, unevenness of rotation of the heat roller and moving speed of the transfer paper and the like, and if control is made by any kind of means, a plurality of containers can be successively pressed against a single roller to apply printing to the drum without partly or wholly transfer slippage.


DISCLOSURE OF THE INVENTION

An object of the present invention is to provide a new method and apparatus which can carry out transfer at high speed and positively by means of a heat roller which is always uniform in temperature distribution of a roller surface, easy in temperature control in an electrical manner, and is free from rapid variation in temperature difference before and after the control.
Another object of the present invention is to provide a new transfer printing method and an apparatus therefor which can use a transfer film having a synthetic resin film used as a base, and adjust a position between a container supplied to the heat roller and a printing layer of a transfer film, for each container.
Yet another object of the present invention is to provide a new transfer printing method and an apparatus therefor which comprises applied pressure control means which is extremely effective for aluminum containers whose drum is cylindrical and having an open end equal to the drum, plastic containers, and particularly plastic cans obtained by injection stretching blow molding.
The present invention, which can achieve the aforementioned objects, is characterized by use of an induction heat generation roller based on the principle of exothermic of low-frequency induction heating as a heat roller.
This heat roller has an induction coil incorporated therein as a magnetic flux generation mechanism comprising a coil and a core, in which the roller itself generates a Joule heat by electromagnetic induction action produced by application of voltage, and which is free from heat loss unlike an indirect heating system using a self-contained heater and having a high accurate temperature controllability. In case of a heat roller in which a jacket is provided in the inner peripheral surface of the roller to seal a heating medium therein, further uniform surface temperature distribution characteristic can be a

REFERENCES:
patent: 4288275 (1981-09-01), Davis
patent: 4336095 (1982-06-01), Hoffmann
patent: 4381211 (1983-04-01), Nechay
patent: 4701235 (1987-10-01), Mitsam
patent: 4735664 (1988-04-01), Asgar et al.

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