Arrangement in a mixer, especially for mixing printing color

Details Arrangement in a mixer, especially for mixing printing color Arrangement in a mixer, especially for mixing printing color

1997-08-29

1999-12-14

Soohoo, Tony G.

Agitating

With weighing

3661824, B01F 1504

Patent

active

060008377

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to an arrangement in a mixer, especially for mixing printing color.


BACKGROUND OF THE INVENTION

The present invention has been developed especially in connection with mixing of colors for offset-printing, such colors having a relatively high viscosity, but the invention is not limited to offset-color and can be used for mixing other colors, provided the invention can be used in connection with viscosity values associated with such further colors.
Generally, printing color is manufactured in the color factory in limited series from so-called base colors. On the basis of these base colors there exists a wide spectre of defined colors, i.e. with a prescription consisting of an accurate mixing ratio.
In order to achieve correct color, or color mixing, the prescription must be adhered to with great accuracy, since small deviations will give wrong color result.


PRIOR ART

It is today known that color mixing within the graphic industry or mixing of offset-colors takes place by a manual process, wherein the only auxiliary means during the color mixing is a scale. This is a time consuming and very difficult task if the result is to be a completely accurately prescribed end color.
Consequently, the prior art manual method is hampered with the following disadvantages: machine), color, which entails large wastage.
Besides, from GB-A-2 103 951 there is known a multi component valve serving to mix predetermined gas components received from separate pressure supply tanks, which valves not straight away can be used for mixing printing color.
From U.S. Pat. No. 4,688,944 there is known a mixing head for reactive mixture of two or more plastic components in a mixing chamber, there being used a respective dosage valve during a supply step and a respective recirculation valve in a later recirculation step.
From U.S. Pat. No. 4,944,599 there is know a system with closed feedback loop control for a high pressure mixing system. The system comprises a displaceable nozzle needle regulating pressure and volume as well as other parameters in the mixed product.
From U.S. Pat. No. 4,946,284 there is known a mixing head for mixing liquid state material, comprising supply channels to a mixing chamber and return channels. Besides, there is used a first valve for opening the inflow to the mixing chamber and a second valve for opening and closing the return channels.
None of said publication gives any information about valves comprising two or more color throughputting openings for crude and fine dosage of color, respectively.


OBJECTS OF THE INVENTION

The object underlying the present invention is to avoid the previously discussed disadvantages with which the prior art technique is hampered, for thereby providing an arrangement in a mixer whereby is achieved: for preparing the printing machine, no need for making special colors, database.


BRIEF DISCUSSION OF THE INVENTION

These objects are achieved in an arrangement in a mixer of the type as stated in the preamble, which according to the invention is characterized in that the arrangement comprises a plurality of color containers each containing a base color, as well as output conduits through which base color can be delivered to a valve carrying distribution means which can be brought in communication with the individual color containers via said outlet conduits, as well as control means which according to a preset program influences the distribution means to let through a desired quantity of base color from preselected color containers to a common mixing vessel, preferably on a weight basis.
Further features and advantages in connection with the present invention will appear from the following description taking in connection with the appended drawings, as well as from the appended patent claims.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic perspective view illustrating an example of how an arrangement in a mixer according to the invention can be implemented.
FIG. 2 illustrates, on a larger scale, an example of

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