DE3221144A1 - Disposable composite doctor for intaglio printing - Google Patents

Abstract

A cost-saving doctor for intaglio printing, in which a sufficiently thin doctor strip having self-polishing characteristics is plugged with a small amount of projection into a resilient doctor blade holder. This replaces the previously customary intaglio printing doctor which needed special grinding for the required scraping property. There is an approximately fourfold saving in materials and costs for the new doctor compared to the conventional doctor.

Description

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Current state of the art

A) Conventional doctor blades:
See sketch Al

The actual working squeegee (Parbabetreifiaesser for gravure cylinders) is approx. 0.1 - 0.2 Him thick and is at the beginning and sharpened on one side like a knife after wear. A thinner squeegee with a self-sanding effect would work Bend away under the pressure of the squeegee paint. The support squeegee is used in the manner of a graduated pederu packet of the well-measured spring action of the said Squeegee arrangement.

ORIGINAL INSPECTED

B) Facet squeegee (thin-section squeegee, tongue squeegee)
See sketch p

With this squeegee, the length of the tongue (facet) to be worked off is already A self-grinding effect is achieved because it is only 50 - 75 µm thick is. The disadvantage, however, is the costly grind of this doctor blade. After working off the tongue, the entire squeegee is thrown away or conventionally sanded again using method A.

The material loss of high-quality doctor blade steel is also considerable. The usual The width of the squeegee is 40 - 80 mm with lengths of approx. 1 - 2.5 meters and thicknesses of 0.1 - 0.2 mm.

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How the new squeegee works Claim:

See sketch B2

Instead of the above dimensions, only a steel band of, for example A width of 5 - 10 mm and a thickness of less than 100 µm, e.g. 50 - 75 µm, is used, with the self-grinding effect without sanding entry. This actual working lamp?! - Ie is for example according to claim 2 in one Plastic profile taken, which is provided with a rear slot, with this Yerbund squeegee is plugged directly onto the support squeegee named in A and B. After the steel lamella up to Plastic profile has been processed, the disposable composite squeegee is pulled off the support squeegee and thrown away. With a suitable dimensioning of the plastic profile and the supporting squeegee, the desired - Ge-sanrtr-feder-

ORlGiNAL INSPECTED

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Achieve the effect of the cable arrangement. Explanation: It would not be possible the said Stahllauelle. 50 75 µm thickness straight into a rigid To scan clamp holder, as with one possible protrusion of the lamella of only approx. 1 mm (limited by the dynamic pressure the color) the spring action of the entire arrangement would not be sufficient.

ORIGINAL INSPECTED

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ORIGINAL INSPECTED

ORIGINAL INSPECTED

Claims (3)

32211U 1. Squeegee, thereby gekennzeiebnet that a thin steel belt with a self-grinding effect (approx. 100 µm downwards, preferably 50 - 70 um) is firmly gripped by one or more separate profile strips and the resulting composite squeegee is used as a disposable product. 2. Composite doctor blade according to claim I _1, wherein the steel strip is produced inexpensively by co-extrusion with a plastic profile. 3. Composite doctor blade according to Ansnruoh 1 or 2, wherein the steel band is provided in particular with a continuous perforation, whereby a force-locking fixation of the retaining bar according to claim 1 or a positive connection of the plastic profile according to claim 2 through the steel band is guaranteed. COPV