DE1111762B - Method and device for the production of molded articles from soap - Google Patents

Description

GERMAN

PATENT OFFICE

U5324IVa / 23f

REGISTRATION DATE: MAY 2, 1958

NOTICE THE REGISTRATION AND ISSUE OF THE EDITORIAL: JULY 27, 1961

The invention relates to the production of molded articles from soap by pressing between two cooperating punch halves made of dimensionally stable, lined with a continuous lining Material.

With these stamps, which are mostly made of acid-resistant bronze and one very smooth have a polished surface, soap tablets or bars can be obtained that have a flawless surface own with high gloss. It is, however, even with punches that are designed in such a way that the Soap easily dissolves from the same, required to take the tablets out of the plunger by hand. It has been proposed to remedy this disadvantage by having the stamp with an ejector provides the effective end face of which lies in the surface of the punch. This will however the smooth surface of the punch interrupted, with the result that the tablets pressed therewith have an edge on the surface.

The aim of the invention is to produce tablets or pieces of this type whose surface does not have any unevenness and which do not need to be removed from the stamp by hand.

It has already been proposed to obtain moldings from a molten plastic Mass by pressing a grooved, with a relatively thin layer of a material to use covered roller, which material is so elastic that it is together with the plastic Mass is pressed into the grooves or shapes. This known method is for molding soap tablets but unsuitable because of the hard nature of the soap mass and would not be precisely shaped, always result in even bars of soap. It has also been suggested to solve Moldings made by pressing from a relatively plastic mass to the dimensionally stable The outer edge and the dimensionally stable floor connecting wall part of a shape made of elastic to deform resilient material. This wall part would, however, also because of the hard nature the soap mass, when pressing the soap tablets during the pressing process in considerable Dimensions are deformed. Finally, it is also known when molding objects out plastic masses to release or release the molded product from the mold by means of compressed air. to blow out. Such a method is unsuitable for soap, because the blown piece is in it easily damaged.

According to the invention, the above methods and apparatus
for the production of moldings from soap

Applicant:
Unilever NV, Rotterdam (Netherlands)

Representative: Dr.-Ing. A. van der Werth, patent attorney, Hamburg-Harburg 1, Wilstorfer Str. 32

Claimed priority:
Great Britain May 2, 1957

Dr. Cornelius Johannes Adrianus Cieremans,

Viaardingen (Netherlands),
has been named as the inventor

Disadvantages avoided by the fact that the moldings obtained by pressing by slightly Inward bending of the central part of the made of a relatively strong but flexible material existing chuck loosens at least one of the punch halves. Preferably the bend of the central part of the feed caused by gas or liquid pressure. It is possible to use this pressure apply before the die halves are separated from each other, so that after the separation the formed Soap tablet lies freely on the surface of one of the die halves.

One of two dimensionally stable, lined with a continuous lining, working together Stamp halves of existing stamps for carrying out the method according to the invention are characterized in that the inner surface of at least one of the die halves with a tight fit to the inner wall the punch halves nestled lining is lined with flexible material, and that Means are provided for slightly inwardly bending the central part of the liner. It is the central part of the lining is preferably designed as a membrane.

According to a preferred embodiment, the lining consists of an injection-molded one Piece of plastic. This process represents a very cheap method of making large numbers identical parts with very smooth surfaces.

109 649/83

The means for inwardly bending the central part of the liner preferably consist of channels in the stamp for the supply of the compressed gas or the hydraulic fluid.

The invention is described in more detail with reference to the drawings.

Fig. 1 is a longitudinal section of the most important part of a stamp according to the invention,

Fig. 2 is a section along the line H-II of Fig.l,

FIG. 3 is a section along the line IH-III of FIG. 1.

The stamp has an upper half 1 and a lower half 2. The two stamp halves are essentially identical. Each die half consists of a base plate 3 or 3 ¹ , a support ^{plate 4 or 4 1} and an insert 5 or 5 ¹ . The upper base plate 3 is provided with a pin 6 with which it is fastened to the head of the press, and with two guide pins? Which slide ^{snugly in the bushes 8 of the lower base plate 3 1.} The downward movement of the upper die half is limited by the fact that each pin 7 is attached to a thicker part 9 which strikes the sleeve 8 when the edges 10, 10 ^{1 of} the inlays 5, 5 ¹ just touch. The middle parts 11, II ^{1 of} each insert are so thin that they can act as membranes. The support plates 4,4 ¹ have cavities 12,12 ^{1 of} the desired profile. You only need to give the support plates the desired profile in those places where the insert is very thin. The insert 5 or 5 ¹ , the support ^{plate 4 or 4 1} and the base plate 3 or 3 ¹ are connected to one another by means of a frame 14 or 14 ¹ which fits into grooves 13 or 13 ^{1 of the insert.} These parts are clamped together by means of bolts 15 and 15 ¹ , which pass through the base plates 3 and 3 ¹ and are screwed into the frame 14 and 14 ^{1, respectively.}

The support plates have recesses 16 and 16 ¹ on the side facing away from the membranes, which are connected to one another by means of channels 17 and 7 ¹ in the base plates 3 and 3 ^{1, respectively.} Means are provided on the free surfaces of the base plates to bring the channels into communication with a suitable source of pneumatic or hydraulic pressure. The support plates are provided with channels 18 and 18 ¹ , respectively, whereby the cavities 12 and 12 ¹ can be brought into connection with the recesses 16 and 16 ^{1, respectively.}

If the tablet has been pressed, it remains hanging on the upper or lower half of the punch after opening the press. If, in the former case, pneumatic or hydraulic pressure is exerted through the channels 18 and, in the latter case, through the channels 18 ^{1 , the membranes 11 or II 1 are} deformed, as a result of which the tablet becomes detached.

It is of course also possible through both

Channels to let pressure at the same time before the

Press is open; in this case the tablet will

after opening freely on the bottom of the lower

ίο The punch half is at rest.

Claims (6)

Patent claims: 1. Process for the production of moldings from soap pressing through between two cooperating Die halves made of dimensionally stable material lined with an uninterrupted lining, characterized in that the molded bodies obtained by pressing through zo slight inward bending of the central part of a relatively strong but flexible one Material of the existing lining loosens at least one of the punch halves. 2. The method according to approached, characterized in that that the bend is caused by gas or liquid pressure. 3. Stamp for performing the method according to claims 1 and 2, consisting of two dimensionally stable, cooperating die halves lined with a continuous lining, characterized in that the inner surface of at least one of the die halves with a chuck made of flexible material, nestled tightly against the inner wall of the punch half is lined, and that means for slightly inwardly bending the central part of the Feed are provided. 4. Stamp according to spoke 3, characterized in that the central part of the lining as Membrane is formed. 5. Stamp according to spoke 4, characterized in that the feed consists of an injection molding process manufactured piece of plastic. 6. Stamp according to claims 4 and 5, characterized in that the means for inward bending of the central part of the chuck consist of pressurized gas or pressurized fluid supplying channels in the punch. Considered publications:
German Patent No. 872149;
Swiss patent specification No. 60 325,294 676. 1 sheet of drawings