Printing – Stenciling – Rotary machines
Patent
1995-12-11
1998-07-07
Yan, Ren
Printing
Stenciling
Rotary machines
101425, B41L 1300
Patent
active
057752184
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The market demands that the textile printer manage an increasingly larger variety of print applications--more variety of design and more variety of color combinations per design--in smaller and smaller application sizes while still increasing the economic viability. With these requirements comes the demand to effectively shorten (effective in a productive sense) the ever increasing time required for rigging and cleaning. At the present tine, the purely printing production time in many printing houses is already less than 50% of the entire run time (work time), which is unacceptable.
Considering this objective, application equipment has been suggested which allow cleaning of the application equipment itself and if need be the round template surrounding it on the printing machine. Also, with such equipment, the possibility must be provided to transport a template to a washing machine installed next to the printing machine and clean it there if the color is to be changed in just one template. The invention thus pertains, similar to EP 0 494 339 A1, to an apparatus for the application of a substance onto a fabric train, particularly for textile printing, by means of round templates in which the application device includes equipment for the cleaning of the application equipment itself and of the template if necessary and in which the feed of the substance and of cleaning fluid proceeds through a tube parallel to the template and through a multitude of lateral exit holes. Between the exit holes and the point of application, or cleaning zone, no portions touching or carrying the applied substance or the cleaning fluid are located, so that the substance or cleaning fluid flows directly from the exit holes to the interior of the template. The equipment shown by EP 0 494 339 A1 avoids a disadvantage of the older equipment according to EP 0 277 481 B1, in which baffles are arranged for the distribution of a substance coming from the lateral exit holes, which bring into question the mandatory self-cleaning of the application equipment in the sense of the general objective. In order to achieve a uniform distribution of the substance to some extent over the width of the fabric train to be printed without such guiding and distributing surfaces, the substance is fed to the exit holes, whose typical spacing is 50-100 mm, under high pressure according to the state of technology. In order to build up an effective pressure over the entire exit width, the exit openings are small. The pressure must be high enough so that the substance does not exit in a closed stream per EP 0 494 339 A1, but rather is sprayed in a fan shape.
SUMMARY OF THE INVENTION
The invention starts with the reasoning that the spraying of the substance and of the cleaning fluid under high pressure is not optimal for either the application process or for the cleaning process. The goal, first strived for by the invention, of retaining templates and application equipment in a combined constructed state is only achievable through an optimization of the cleaning process if cleaning is done by choice in a specialized washing machine.
According to the invention, the application equipment is to be retrofitted such that the normally viscous applied substance (printing paste, printing colors) can flow (not spray) nearly pressureless in a slowly streaming condition at greatly reduced pressure compared to the inlet pressure in a practically closed stream of uniform thickness distributed evenly over the application width at the point of application. Since low pressure is used in the application procedure the pressure at cleaning can be significantly increased whereby water or another non-viscous cleaning material reaches the round template interior wall with high velocity straight in the axial direction of the exit holes and flushes it. The template openings are permeated by the cleaning fluid which makes a certain cleaning of the template exterior possible.
The desired method of functioning is accomplished according to the invention by m
REFERENCES:
patent: 3986450 (1976-10-01), Zimmer
patent: 4436032 (1984-03-01), Van Ouwerkerk
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