Printing – Stenciling – Rotary machines
Patent
1991-04-11
1993-08-31
Burr, Edgar S.
Printing
Stenciling
Rotary machines
101129, 118414, B41L 1304
Patent
active
052399222
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/AT90/00077 filed Jul. 31, 1990 and based, in turn, upon Austrian National Application A 1943/89 of Aug. 16, 1989 under the International Convention.
FIELD OF THE INVENTION
The present invention relates to a process for applying a liquid to a web of material and, more particularly, to a method and apparatus for coating, printing or dyeing of webs of material wherein the printing or the coating is manually set to the desired values during a short yardage production and the positions thus selected are maintained, further, during a large-scale production.
BACKGROUND OF THE INVENTION
In practice there is a great variety of requirements when performing finishing, --printing or full-surface application processes on a web of material. Some of these requirements stemming from differences regarding the quality of the goods and the technological requirements, as well as from differences in the lengths of material to be produced.
In the textile finishing industry, there are production runs in which only very small lengths of material have to be produced, such as prints for neckties. There are also production runs where the orders amount to a few hundred meters, as well as large orders, each amounting to several thousand or tens of thousands of meters, which are to be produced with the same application results.
For instance one of the basic requirements in the textile printing practice is the so-called sampling of a new design in various color combinations, each on the shortest possible pieces of material. As a rule, from a great number of such short sample pieces some are selected as a basis for large orders.
In practice, considerable difficulties are encountered in the conversion process from these samples produced on,small length of material to a large-scale production to date there are no installations and methods which can fully meet the existing requirements.
OBJECTS OF THE INVENTION
It is the object of the present invention to eliminate the drawbacks characteristic to the prior art. Still another object of the present invention is to provide the coating process achieving a general improvement in the quality of pattern-printing and full-surface finishing application on a web of material.
SUMMARY OF THE INVENTION
Among the difficulties existing now in the conversion from small-scale, or sample production to large-scale production, two of them have to be particularly pointed out, i.e. the techniques of dye and substance supply and the contact with the web referred to as the doctor blade technique.
When short sample pieces are produced in case of smallest-scale and small-scale production, it is usually, required to bring the printing paste manually to the application station, i.e. the doctor blade device. In the case of large-scale production, automatic supply systems are used. The situation is similar when it comes to doctor blade devices for sampling purposes and to small-scale production. For the purposes of quicker handling and shorter resetting times, simple, manual application devices are preferred. In the large-scale production machines, doctor devices are used which are more cumbersome to handle or attach, and as to mechanical mounting and precise adjustment. The aforedescribed differences in the supply of dyes and in the doctor blade technique have almost always serious consequences on the quality of the printing or finishing result.
Frequently, the practitioner has a lot of trouble in converting the selected, sample pieces into large-scale production,and yet preserving all quality criteria true to the sample. Often, all dye concentrations, dye viscosities and doctor blade adjustments have to be newly worked out for the large-scale production, since the critical parameters for the printing cannot be transferred. The calculation of the new parameters is very work-intensive and time-consuming and very uneconomical, due to the interruptions in the production process which result. Most of the time, the trials to est
REFERENCES:
patent: 3974766 (1976-08-01), Zimmer
patent: 4516495 (1985-05-01), Ericsson
Burr Edgar S.
Dubno Herbert
Yan Ren
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