DE478954C - - Google Patents

Description

GERMAN EMPIRE

ISSUED JULY 8, 1929

REICH PATENT OFFICE

PATENT LETTERING

CLASS 23 f GROUP 1

W 78066 Vl \ 23f day of the announcement about the granting of the patent: June 20 ig2g

Dr. Adolf Welter in Krefeld-Rheinhafen

Mouthpiece for extrusion presses for pressing semi-solid or solid, plastic masses

through sieve plates

Addendum to patent 477 699

Patented in the German Empire on December 31, 1927.The main patent started on February 12, 1927.

The main patent relates to a die for extrusion, in which thin metal sheets with fine openings down to about 0.4 mm are provided and stiffened in a suitable manner, so that the mass to be compressed does not have long bores or channels, but only short ones, if desired has to go through conical bores and the required pressure very diminished. The plastic masses in question are then not needed more to be pressed under hydraulic pressure, but can be done by means of ordinary extrusion Process in uninterrupted operation. The inventor has now determined that

! 5 you can go down much more with the diameter of the pressing openings, namely down to about 0.05 (one twentieth) millimeter, and that apart from the masses just envisaged, namely soap or flour noodles, in general, all semi-solid and solid plastic masses that are sufficiently homogeneous ^{can be pressed through sieve plates of about 1} Z ₄ up to a maximum of 2 mm thick, the holes of which have a clear width of no more than 2 mm, but can be as narrow as possible at the bottom.

You already have flour noodles with a diameter of up to 0.8 mm produced by pressing, but one used one when using hydraulic presses Pressure of 300 atmospheres, because the narrow compression channels allow the mass to pass through to oppose great resistance. The fact that this problem could be remedied by reducing the thickness of the plate was not an option so less foreseeing than one could not have expected that this reduction would so increase the pressure would greatly reduce the fact that, instead of hydraulic presses, one now uses simple, moreover continuously operating extrusion presses. It also seemed unthinkable that any hole, however thin, could be used. And also left a third Advantage of the device to be used cannot be foreseen, namely that the cleaning the plates in the event of any blockages simply by swiveling them out in the case of such short ducts in a solvent, e.g. B. water, and the previous cumbersome and time-consuming Piercing fine wires through the individual holes would be superfluous.

In practice you can, for. B. plates ¹ l ₁ mm thick with holes 0.05 mm in diameter, which are obtained in a conventional manner by drilling, punching, hitting or by means of the penetration of electrical sparks and which are drilled conically. Even with holes from 0.5 to 0.7 mm in diameter, 2500

Make up to 5000 such openings, i.e. on 1 cm ² 25 to 50, and thus achieve a very large free cross-section and a performance of the press of 500 to 1000 kg per hour despite the finest openings, while up to now, under a considerably larger one Effort, only about 60 to 100 kg to 0.8 mm of fine pasta achieved per hour.

It has now turned out to be just as surprising

to way shown that you can use metal screens instead of metal plates, see above that even drilling is no longer necessary, because you can use a suitable weave to make holes from 0.4 to at most 2 mm can be obtained in a known manner.

These woven screens have the drilled ones, especially for not too firm, plastic masses Many economic advantages over sheet metal.

The plates or sieves can be placed in the

both of the first-mentioned patents can be seen in the form of grid plates, rods, belts o. The like. Stiffened and secured against bending.

The device described here can be sufficiently homogeneous, semi-solid for pressing all and solid, plastic masses, such as B. soap, glue, gelatine, gum, chocolate

o. The like. The method is not claimed in application to liquids, in particular not For pressing liquid soap or artificial silk, which has previously been used with fine Nozzles splashed and where it didn't matter, plastic (i.e. not liquid) masses to press, but to generate jets of liquid that solidify only outside of the press plates should.

Claims (2)

Patent claims: 1. Mouthpiece for extrusion according to patent 477 699 for pressing semi-solid or solid, plastic masses through fine sieves, characterized in that the Sieve plates are not more than 2 mm thick and with the diameter of the - if necessary conically shaped - press openings does not exceed 2 mm. 2. mouthpiece for extrusion presses according to claim i, characterized in that one gives the individual wires in this fabric a distance of no more than 2 mm and with the thickness of the sieves does not exceed 2 mm. 4 ** 'X ΒΓΠ1 IN OFORUCKT IN t »F K Supplementary sheet to patent specification 478 954 class 23 f group 1. According to the waiver declaration received on April 1, 1932, claim 2 has been waived v.orden.