DE1436928A1 - Method and apparatus for forming paper stock and the like. - Google Patents

Description

concerning
Method and apparatus for forming paper stock and the like.

The invention "relates to a method and a Apparatus for shaping paper stock or the like and relates in particular to an apparatus which makes it possible to Suction molds to form compacted paper stock products with a smooth outer surface at high speed, without it being necessary to use supplementary forms that match the suction forms.

If one forms with the help of üaugformen articles of paper pulp which do not receive coming with the suction mold in contact "of products laugh a rough and uneven shape \ the characteristic occurring thereby increases consist of i'aserbündeln and are on the extraction of water from the Gaps between the fibers of the paper stock, however, it is desirable instead of a rough and un-ί

I flat surface to create a smooth surface around the object to give a more pleasing appearance. Jiis now happening j ■■ this in such a way that in connection with the suction forms one can precisely using matching counter-shapes that have a smooth surface,

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their shape of the desired area of the molded paper stock Product corresponds; these counter-forms are formed with the rough surface dres from the deposited paper stock Product brought into contact while the product is moving is still on the suction mold. These counter-forms exist made of metal or a flexible material such as rubber. Such countermolds are expensive and their use causes a reduction in the speed of production. aside from that When using such countermoulds, it is generally necessary to provide complicated facilities by means of whose the two cooperating parts of a mold are brought into exact congruence with one another. Until now it is further away It is customary to lift the article formed from paper stock from the suction mold and to press it between heated mold halves. This has the same disadvantages as the one above described procedure. Furthermore, it has already been proposed to place a stretchable belt near the uneven parts of the pulp molded product,

If the product is still on the suction mold, it acts through the paper product onto the stretchable \ ChJUftr -. A negative pressure is applied, so that the belt is sucked against the imubV uneven surface in order to smooth out this puddle. cause. It is true that the result is a reduction in costs, but the product leaves nothing to be desired In all these known processes for smoothing eratueae formed from paper stock, one assumes a mostly oil-moderately rough surface, the paper _{stock formed for the structure is characterized by the characteristics of the structure}

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My search provides for more measures to address the aforementioned to eliminate indifference; for this purpose, the characteristic elevations are avoided before they arise can; this is done by providing a hard flexible endless belt that exerts pressure on the in Touched EDg with the suction form applies stationary paper material while the paper stock is still in a gelatinous state is located. ·

An object of the invention is thus to provide an improved method and an improved device for generating smooth surfaces on products formed from paper pulp to be provided.

Another object of the invention is to provide • Ines process and a device for manufacturing from paper material molded objects with greater strength, larger * greater density and increased evenness

furthermore, the invention sees a device that is simpler Constriction that can be manufactured at low cost.

Furthermore, the invention provides a device that ^! works in a simple way and with a high degree of speed, and no auxiliary equipment is required to bring standard parts to cover. ,

Another "aspect of the invention is" a misconception. f "HREA and an apparatus such that a λ improving Geiöhwindigkeit and uniformity of Srock- * -. Laing ems pulp molded products obtained so that a

the speed of production and warping.

6AD

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of the products is reduced during drying. It ^ OvJiIO

Furthermore, the invention provides means to objects produce in which the wall thickness varies.

The invention is illustrated below with reference to schematic ' Drawings explained in more detail using an exemplary embodiment.

Fig. 1 shows a partial representation according to the invention Contraption.

Fig. 2 is a partial section drawn on a larger scale along the line 2-2 in Fig. 1 and shows the way in which the paper stock is deposited on a suction mold.

Fig. 3 is an enlarged fragmentary section along the line 3-3 in Fig. 1 and shows the belt by means of which a pressure is applied the paper stock deposited on the suction form is applied.

According to the drawings, the paper pulp products are formed on suction molds 10 in that the suction molds are passed through a container 12 in which there is a paper pulp on float 14-. The suction molds can be arranged on a central housing which is rotatably mounted so that the suction molds execute a rotary movement and pass through several stations, namely a station at which the paper stock is deposited on the suction mold, a station for applying pressure onto the paper pulp product, a drying station and a station at which the product is lifted from the suction form. D ^.; However, the invention only relates to the stations for depositing the paper stock and for applying pressure to the product.

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Each suction mold 10 is made of a porous material in a known manner, or it is formed by an oieb 16. While a suction form 10 is being guided through the paper stock suspension 14, it is subjected to a negative pressure which causes the paper stock 18 to be deposited on the suction form. While the paper stock is deposited on the suction form and water runs off the paper stock, the lilac fibers tend to combine into bundles, with the running water flowing through channels running between the bundles, where the slightest resistance is opposed to the water . During the spontaneous generation of the object under the surface of the suspension 14, the water acts as a carrier for the even distribution of the fibers, because the external ratio is usually about 99 liters of water per part, in other words, because of the high water content of the fiber suspension This results in an essentially even distribution of the fibers and a uniform drainage of the water in the container 12. At the moment when the suction form moves out of the suspension, the gelatin-like paper pulp held by the vacuum on the suction form still contains as much water that the fibers are still well dispersed. JSr3t after most of the water has been discharged, tend DIE fibers to ball up and the characteristic

_m : ·, -: ■ t. To form increases.
ο

oo In order to prevent that the fibers in this manner

*> unite and form the characteristic elevations will

f * an evenly continuous surface 20, which according to FIG. 3? 1 through a

jp, endless belt is formed, pressed against the paper stock 18,

while aiofo dey ! "paper is still in the very wet or

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tine-like state and still contains sufficient water to keep the fibers in the dispersed state. In this way the in lig. 3 molded designated 22 'üeil of · ■ pulp product, which on removal of the i / rseugnisses products else produced by the suction mold as a very dense, smooth and tight turns and significantly trockkener than in known i /. This pressure is preferably brought into effect while the paper stock deposited on the suction form is still below the surface of the suspension; During the nox-painting operation of the device, however, the pressure can also be reduced immediately after the jug mold has emerged. the suspension is brought to earth, ie within 0.5 seconds and preferably before 0.25 seconds of the appearance of the suction form from the suspension. If the pressure is applied while the deposited paper stock is still in a gelatin-like state and the water is still running off the material, the fibers remain dispersed and are deposited evenly on the form. This creates an exceptionally smooth surface in the contact area of the means applying the pressure. Furthermore, the pressure medium 20 and the belt serve da.zu _s 22 to protect there against the deposition of other paper material, where the means 22 contact the product when the Gfurt brought under the surface of the stock suspension for contacting the product to the already deposited pulp ° is * Here you get a product with different thicknesses, because at 23, according to 5 ¹ Ig. 3 further paper-

**. fabric off,
ο

® The means for applying the pressure are preferably around an endless belt made of stiff J-ummi} a sol-

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Rather, belt includes, for example, a broken association with four Layers of canvas and rubber, being the thickness of the strap is greater than about 6.5 mm; however, it also has a belt in the form of a layered bandage with two layers. made of canvas and rubber and found to be useful with a thickness of about 1.6 mm. However, one could also do any other Use hard material with a smooth surface, e.g. rigid plates, panels made of plastic or rollers made of rubber.

Optionally, the means for applying pressure may comprise _o on its outer surface a Musterun, so that a corresponding pattern is pressed into the outer surface of the deposited paper material. Referring to Fig. 5, the pattern 24 'can be designed so that the paper stock product is provided with lips or corrugations in order to increase its strength; furthermore, such a pattern can only be provided for decorative purposes.

The endless belt 20 can be freely on his i in arranged Italy 26 and 28 run, and he is thereby driven that the iäaugformen are in frictional contact move the strap in it. The belt 20 must be taut State in contact with the building forms 10 so that it touches the outer surface of the still gelatine-like material, without air being trapped between the belt and the material. Furthermore, the belt is tightened _ »Stood against the üau forms printed to get the necessary pressure ^ to raise and to {, guarantee, there!.; the strap of the daugo

^ shape is taken; for this purpose is a dpa ^ urolle with ; .eei,; notes Verr: telling 52 provided. The iiolleii 26,

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and 50 are together with the adjusting means 32 by a generally ΐ-shaped component 34 supported ..

While the "suction mold in question" is emerging from the container 12 moves out, the pressure applying belt 20 moves together with the suction mold, so that pressure is constantly applied to push water out of the paper stock. By this squeezing effect in connection with the effect of the on the other Side of the paper stock suction - the / remaining 'water, essentially completely off removed from the product. About 2 to 3 seconds after the moment in which the belt emerged from the pulp suspension the vacuum begins to act on the belt from the back of the suction mold, but at this point it is Water has already been squeezed out of the paper stock. The product then reaches the subsequent stations and is optionally subjected to further known pressing processes after completion of this pressing process, as mentioned above became.

It should be emphasized again that it is important for the invention that the pressure is applied to the paper stock, while this is still in a gelatinous state. If the application of pressure is delayed until the

to negative pressure can act on the entire deposited paper stock,

cd so that the water is replaced by air, - has the deposited

~ * Paper stock already formed the characteristic bumps. _o ■ It is "noticed that besciiriebeuen above, in the

oo iS.asführuii; -; sbeispiel / die vei'sc ;: the most diverse changes and modifications provide "can, without the liere ca of the invention:, u

l-'alentan & s cloths;

Claims (1)

-9- 1A-25 782 PA! 0 EN i ¹ A ι, Ü PH iJ ΰ Ι Ε 1. Method of making from paper stock or the like shaped products with the help of »suction molds which a set of eye molds through one with a stock slurry filled container and a negative pressure is applied to the Saubformen, so that paper stock deposited on the suction molds, characterized in that on the deposited on a suction mold Paper stock a JJi'uck is applied while the paper stock is moving is still in a gelatin-like state. 2. The method according to claim 1, characterized in that g e Ic e η η ζ e i c h net that the pressure is applied to the paper stock, before the suction form emerges from the paper stock suspension. 5. The method according to claim 2, characterized in that it is marked net that the pressure with a kiIfe is continuous moving Hache is applied. ■ 'V. Procedure according to. Claim 3, characterized in that the continuously moving surface protects a part of the paper stock deposited on the suction form against the deposition of further paper stock. 5 · Device for making paper-based products or the like by means of suction molds a container for a pulp suspension, a set of üaugformen, which by the paper stock suspension in the Containers can be guided, as well as means for applying a negative pressure through the suction molds, g e k β η η - 5AD ORIGINAL -10- 1A-25 782 is characterized by, the container immediately adjacent Means for applying pressure to the exposed surfaces of the stock deposited on the suction forms while the paper stock is still in a gelatin-like state. 6. Apparatus according to claim 5 *, characterized in that the serving for applying pressure Means extending into the container. 7. Apparatus according to claim 6, characterized in that the smock for applying pressure comprise a continuous surface which can move continuously during operation of the device. 8. Apparatus according to claim 7 _t, characterized in that the contiguous area is formed by an endless üurt. 9. The device according to claim 8, characterized ge k e η η, that the endless belt is relatively stiff and as a layered bandage of rubber and layers of canvas is constructed. 10. Apparatus according to claim 8, characterized in that the endless belt on its outer surface carries a pattern, so that the paper stock deposited on the suction forms is provided with a corresponding pattern. 11. The device according to claim 6, characterized in that the means applying the pressure parts of the paper stock deposited on the eyes against the deposit Cover or protect other paper stock.