DE1164359B - Method and device for the production of forming screens for pulp molds - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: B21f

German classes: 7d-6

Number: 1 164 359

File number: D 336891 b / 7 d

Filing date: July 2, 1960

Opening day: March 5, 1964

Papermache articles are advantageously made in shapes made of metal, e.g. B. brass, exist. Such a shape has a large number of small holes. The shape is in the Broth of pulp fibers and water immersed, whereupon a suction is exerted on the other side to suck the water through the mold. A mold sieve, which is on the mold side is located, collects the pulp fibers and prevents them from passing through the small holes. After a sufficient amount of pulp fibers has settled on the forming screen, the form is off taken out of the broth, and the item is then withdrawn from the mold.

The manufacture of a forming screen for a relatively simple object, e.g. B. a cake plate makes no big trouble; But there are also mold screens for much more complicated objects, such. B. Egg tray, required. Such objects have many protrusions and indentations; in some In some cases, separate mold screens are to be provided for one or two projections and indentations each.

The manufacture of so many individual mold screens to use in one mold for a complicated one The object is difficult and time-consuming, including fitting the small pieces together the mold sieve is added to the mold.

Such complicated papermaking items come because of the much higher price of the multi-part forming screens and more expensive to assemble than simple objects.

The object of the invention is a method of making a one-piece forming screen for papermachine articles of very complicated shape.

The method according to the invention is characterized in that that the metal mesh is corrugated before forming. By the waves of the subsequently A kind of wire supply is created in the area of the areas to be formed for deep-drawn sieves, from which material can be drawn during the deep-drawing process. It will be so tearing the Prevents sieves during forming.

In the drawing, the method according to the invention is shown using an example; it shows

Fig. 1 is a perspective view of the first process step,

F i g. 2 a perspective view of a second method step,

F i g. 3 shows a section along the line 3 A-3 B of FIG. 2,

4 partial sections to illustrate further process steps,

Method and device for the production of forming screens for pulp molds

Applicant:

Diamond National Corporation, New York, N.Y.

(V. St. A.)

Representative:

Dr.-Ing. W. Kruse, patent attorney,

Augsburg, Säulingstr. 42

Named as inventor:

Richard Francis Reifers, New York, N.Y.

(V. St. A.)

Claimed priority:

V. St. v. America July 17, 1959 (No. 827 943)

Fig. 5 is a perspective view of a finished forming screen of complicated shape.

In Fig. 1 denotes 11 and 12 a pair of beading rollers which are supported by a frame 13. The beading rollers 11 and 12 have a wavy surface 14 in their axial direction; one or both rollers 12 and 12 can be rotated by means of a crank 16. The axis 17 of the upper The bead roll is carried in a bearing which is adjusted in the vertical direction by means of a screw 18 can be. By turning the adjusting screw 18, the center distance of the rollers U and 12 changed; there is a similar set screw 18 on the other side of the frame 13.

A metal screen or fabric C passes through the nip of the beading rollers 11 and 12. This metal mesh C is preferably made of phosphor bronze with a mesh configuration of 50-41 and 0.575 mm in thickness. As can be seen from Fig. 1, the straight wires 20 of the fabric C extend in the direction of movement of the fabric C through the nip of the beading rollers 11 and 12 and transversely to their wavy surface 14. Wavy wires 21 extend transversely to the wires 20 and 14 correspond to the weft of a textile fabric, while the wires 20 correspond to the warp threads.

As can be seen on the right-hand side of Fig. 1, the beading rollers in the metal mesh created waves across the wires 20.

409 537/108

After the metal mesh has passed the beading rollers, the rollers are set using the adjusting screw 18 slightly separated from each other. It has been found in the aforementioned phosphor bronze metal fabric that the best results are obtained when the roles 0.5 mm apart. The metal mesh is then rotated 90 ° and again left through the beading rollers, the wires 20 now running transversely to the direction of movement, as from Fig. 2 can be seen. Left on this figure be ίο are found in Fig. 1 on the right side of the bead rollers waves, while on the right Fig. 2, the metal mesh is double-corrugated.

Section 3A in FIG. 3 shows a double- corrugated section across the wires 20, while section 2> B represents a single-corrugated section parallel to the wires 20. In the section ^ the metal mesh is sinusoidal and relatively flat. In contrast, the depth of the metal mesh in section 35 is relatively greater.

The metal mesh shown in Fig. 3 is suitable for use in a pulp form and can, as explained below.

In Fig. 4, 30 denotes a heating chamber into which the metal gauze C is brought. The metal mesh is held for about 2 minutes at about 540 ° C, after which it is in still air at Allowing room temperature to cool. Now it becomes a mold between the mold halves 31 and 32 33 brought, which is mounted in a press. This shape 33 corresponds to the papermaking article to be manufactured. The metal mesh placed between the mold halves 31 and 32 becomes a force Subjected by about 11.

During this pre-pressing, the metal mesh is only partially formed and then again in a heating chamber 30 exposed to a temperature of about 540 ° C for 2 minutes. You then leave it in peace Cool air at room temperature. The metal mesh is now brought back into the mold 33, taking care that the partially formed metal mesh with the configuration of Mold halves is aligned. The press is now operated with 201, so that the mold sieve the desired Shape.

Depending on the nature of the metal mesh, heating and cooling can also be omitted.

In Fig. 5 shows a single forming screen for a complicated object. A mold sieve 5 for a tray-like container with a depth of mm and with about 23 cm long sides has twenty-five depressions, sixteen projections and a peripheral flange on all four sides. The corresponding mold screen S therefore has depressions 35, projections 36 and a surrounding flange 37.

Claims 2, 3 and 4 are real subclaims for their subject matter only protection is sought together with the main claim.

Claims (4)

Patent claims: 1. A process for the production of forming screens for pulp forming by reshaping, e.g. B. Pressing a flat metal, e.g. B. Brass cloth, in the form of paper mache items to be made, in particular those with a complicated shape, characterized by one which precedes the reshaping of the metal mesh Corrugation process. 2. The method according to claim 1, characterized in that the fabric with two to each other rectangular corrugations is provided. 3. The method according to claims 1 and 2, characterized in that the fabric is heated after the wave, held for 2 minutes at 540 ° C, then cooled, then preformed with 1 ton of pressure, then heated again in the same way and cooled and then is finished with 201 pressure. 4. Device for performing the method according to claims 1 and 2, characterized by a rolling mill whose two rollers acting on the fabric are axially ribbed. Considered publications:
German Patent No. 879 201;
British Patent Nos. 708,393, 535,523;
U.S. Patent No. 1942,451; 1589 798,
460 1 sheet of drawings 409 537/108 2.64 © Bundesdruckerei Berlin