Printing – Processes – With heating or cooling
Patent
1996-11-27
1998-09-01
Burr, Edgar S.
Printing
Processes
With heating or cooling
101487, B41L 3514
Patent
active
057995800
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to the printing of colours or patterns from a web of transfer paper and, more particularly, to a device for transfer to a fabric made of vegetable fibers.
A device for transfer from papers having sublimable inks thereon performs the function of placing a web of paper in contact on a web of fabric by imparting thereto a moderate pressure, in such a way that the pattern and the colours on the paper are transferred to the fabric. For this purpose, the paper comprises, in addition to the colouring agents, a transport agent which melts through the effect of heat and which dissolves the colouring agents and then entrains them into the fiber of the fabric.
However, this transport agent has the major drawback of causing a substantial release of very dense vapors during the transfer phase, which is carried out at around 200.degree. C.; these vapors then recondense at the time of cooling and form large deposits on the surrounding floor and on the transfer machine, which represents an unacceptable inconvenience.
Transfer to a fabric made of vegetable fibers, for example cotton, thus appears to be impossible using the conventional sublimation technique.
To avoid this drawback associated with the necessary presence of this transport agent, the inventor has devoted his attention to the development of a device which associates with the transfer operation, properly speaking a complementary operation, involving the extraction of the transport agent, which thus makes it possible, without detriment to the environment, to effect transfer onto a fabric made of vegetable fibers.
SUMMARY OF THE INVENTION
A main object of the present invention thus resides in a device for printing a fabric made of vegetable fibers from a web of transfer paper bearing coloring agents and a transport agent, comprising a heating calendering drum and a pressing roll between which a web of fabric and a web of transfer paper supplied by independent payout rolls, come into contact with one another, a device in which the web of printed fabric remains in contact with the heating drum over at least half its circumference, the said heating drum and the pressing roll being received inside one and the same housing swept by air, which becomes laden with the vapors of the transport agent, the laden air being sent to a tank of cold water.
To permit this contact, the web of fabric passes over an input roll, arranged substantially at the level of the upper portion of the drum, before penetrating the enclosure and passes back over a guide roll, also outside the enclosure and arranged in the vicinity of the input roll, above the level of the lower portion of the drum.
According to one alternative form of embodiment, the transfer paper remains pressed against the fabric over a certain portion of the heating drum, beyond the point of contact with the pressing roll, and passes back over an idler roll.
To ensure air circulation, the closed housing is provided, at its lower portion, with air inlet openings and, at its upper portion, with a discharge tube, equipped with an extraction means, emerging in the tank.
Further characteristics and advantages of the invention will be more clearly perceived upon reading the following description of a non-limitative example of embodiment referring to the sole FIGURE annexed.
BRIEF DESCRIPTION OF THE DRAWING FIGURE
The single FIGURE of the drawing, FIG. 1, is a schematic elevational view of a printing device according to the present invention.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENT
FIG. 1 shows a calendar in the form of a heating drum 1 onto which a pressing roll 2 comes to bear from above. The whole is received in a closed housing 3 accessible via an entry 4 in the form of a hinged door. Outside the housing are provided a transfer paper payout roll 5 and a roll 6 for recovery of the used paper. Similarly, below, are provided a roll 7 to pay out the fabric to be printed, for example a cotton fabric, and a roll 8 for receiving the printed fabric. The web of fabric
REFERENCES:
patent: 3994146 (1976-11-01), Murase
Burr Edgar S.
Nguyen Anthony H.
Sublistatic International
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