DE10015828A1 - Machine for the production of plaster cardboard, couches the side of the underlay with the higher content of fine matter against the side of the intermediate layer with the lower fine matter content, for peeling without damage - Google Patents

Abstract

A machine for the production of a plaster cardboard web, comprises a feed of the underlay (R) and the intermediate layer (E) into the couching zone (20), so that the side of the underlay with the higher content of fine material is in contact with the side of the intermediate layer with the lower content of fine matter.

Description

The invention relates to a machine for producing a back ge, a ceiling layer and at least one inlet arranged between them having fibrous web, in particular a paper or cardboard track, preferably a plasterboard track, in which the by a respective gen Formers formed, on each side a higher Feinstoffge layers with stops are spoiled together.

Various formers have already been used for the production of plasterboard binations suggested:

Dewatering takes place on a machine comprising two gap formers on both gap formers first to the top side and then to the bottom sieve side, resulting in a higher fines content on the lower sieve side leads. The top of the back, which is low in fine materials, is free of fine fabrics chen underside of the blanket.

In the case of a machine comprising a plurality of circular screen formers, one results Fine material enrichment on the round screen side. The tops poor in fine materials are littered with the fine-meshed sieve sides.  

With a fourdrinier sieve for the top and the back as well as a so-called BelLiner gap former for machines with inserts, the fourdrinier sieves are enriched on the top and the BelLiner gap former is enriched on the lower sieve side. The sides of the blanket and the insert 1 , which are rich in fines, are gossiped and the sides of the insert 1 , the insert 2 and the back, which are low in fine material, are gassed.

In the case of a combination of several long sieves The fine sieve results from the four-wire drainage on the top. The gossip of the ceiling and the inlays takes place over the fine material-rich top and the opposite fine low-underside. The insert and the back are with each other facing tops rich in fine fabrics.

With a machine for packaging, comprising two gap formers a so-called "DuoFormer Base" (PB 10652) and a so-called called "DuoFormer Top" (PB 10449) with the same running direction of the Pa Pierbahn provided in the sheet formation. The low-mesh top side is spoiled here with the fine-mesh-rich bottom side.

A disadvantage of these machines is that there are no targeted locations separation between back and insert is possible.

The aim of the invention is to provide an improved machine of the beginning to create named type, in which the aforementioned disadvantage is eliminated. The machine in question is intended in particular for the production of plaster cast be suitable.  

This object is achieved according to the invention in that the back la ge and the insert to be gummed with this Gummizone are fed so that the higher fines content facing side of the supine and the lower fines content facing side of the insert come into contact with each other.

Due to this training there is a reduced layer liability between insert and back. It is a deliberate detachment of the back possible without destroying the ceiling and the insert. Another advantage arises with regard to a possible change in the paper's own with regard to porosity, roughness, penetration properties and Printability.

To form the supine position, a four-wire former is expedient provided, the sheet formation of the supine position with higher fines content on the top facing away from the fourdrinier.

A gap former is advantageously provided to form the insert, which is a forming element formed in particular by a forming roller comprises, the sheet formation of the insert with a higher fines content on the forming element side.

It is also advantageous if the jet direction of the insert former assigned headbox of the jet direction of the supine Shaper associated headbox is generally opposite.  

In an expedient practical embodiment of the fiction machine is inserted in the area of the concerned Rubber zone provided reversed rubber roller.

The upper side of the supine layer with the higher fines content is preferably the one with the lower fines content The top side of the insert messed up.

It is also an advantage if a four-wire former is used to form the top layer is provided, the sheet formation of the ceiling layer with higher fine substance content on the top facing away from the fourdrinier.

In an expedient practical embodiment, the Insert to be rubberized ceiling layer on one in the area of concern the rubber roller provided in reverse.

Advantageously, the upper having the higher fines content side of the ceiling layer with the higher fine material content Bottleneck side of the insert messed up.

The gap former can be a single-layer or a multi-layer Be assigned to headbox.

If necessary, constant pressure drainage can be used for drainage elements may be provided. In principle, these can be used with all molders be used. For example, they can be designed like this is described in DE 197 33 316 A1.

The invention is un based on an embodiment ter explained in more detail with reference to the drawing.

The single figure of the drawing shows a schematic representation of a machine 10 for producing a back layer R, a cover layer D and an interposed insert E having fibrous web 12 , which may in particular be a plasterboard web.

The back layer R is formed by a four-wire former 14 , the insert E by a gap former 16 and the top layer D again by a four-wire former 18 . The sheets are formed in such a way that there is a higher fines content on one side of the respective layer than on the opposite side.

The back layer R and the insert E to be rubberized are fed to the relevant rubber zone 20 such that the side of the back layer R having the higher fine material content and the side of the insert E having the lower fine material content come into contact with one another.

The sheet formation of the supine position R in the Fourdrinier former 14 takes place with a higher fines content on the upper side facing away from the Fourdrinier 22 .

In the gap former 16 comprising a forming element 24, in particular a forming roller, the sheet formation of the insert E with a higher fine material content takes place on the forming element side.

The jet direction of the headbox 26 associated with the gap former 16 is generally opposite to the jet direction of the headbox 28 associated with the fourdrinier former 14 .

The insert E is reversed on a rubber roller 30 provided in the region of the relevant rubber zone 20 .

In the present case, the one with the higher fines content Top of the supine position R with the lower fines content facing the top wire side of the insert E

As can be seen from FIG. 1, a forming shoe 34 can be provided within the loop of the top wire 32 of the gap former 16, for example.

In the area of the headbox 26 loaded with pulp suspension stock inlet 36 , the top wire 32 is via a breast roller 38 leads ge.

The sheet formation of the top layer D in the Fourdrinier former 18 takes place with a higher remnant content on the upper side facing away from the Fourdrinier 36 in question.

The cover layer D to be rubberized with the insert E is reversed on a rubber roller 42 provided in the region of the rubber zone 40 concerned.

In the present case, the one with the higher fines content Top of the ceiling layer D thus with the higher fine material content having the lower sieve side of the insert E swapped.

The resulting fine material distribution is symbolically shown again in the left area of FIG. 1.

A single-layer or also a multi-layer headbox 26 can be assigned to the gap former 16 .

The beam direction of the fourdrinier former 18 associated headbox 44 is to be the direction of travel of the fourdrinier wire 22, through which the two already vergautschten-together layers R, E of the second couching zone fed 40, generally opposite.

Equal-pressure drainage can be used for web drainage as required elements may be provided. Basically, the use of such equals pressure drainage elements conceivable with all formers.  

Reference list

10th

machine

12th

Fibrous web, plasterboard web

14

Fourdrinier former

16

Gapformer

18th

Fourdrinier former

20th

Rubber zone

22

Fourdrinier sieve

24th

Forming element, forming roller

26

Headbox

28

Headbox

30th

Rubber roller

32

Top sieve

34

Formation shoe

36

Infeed gap

38

Breast roll

40

Rubber zone

42

Rubber roller

44

Headbox
D ceiling layer
E insert
R supine

Claims (12)

1. Machine ( 10 ) for producing a back layer (R), a Dec kenlage (D) and at least one interposed insert (E) having fibrous web ( 12 ), in particular a paper or cardboard web, preferably a plasterboard web, in which the through a respective former ( 14 , 16 , 18 ) formed layers (R, E, D) each having a higher fine material content on one side, characterized in that the back layer (R) and the insert to be gummed with it (E) of the rubber zone in question ( 20 ) are fed in such a way that the side of the back layer (R) with the higher fine material content and the side of the insert (E) with the lower fine material content come into contact with one another. 2. Machine according to claim 1, characterized in that for forming the back layer (R) a four wire former ( 14 ) is provided and the sheet formation of the back layer with a higher fine material content takes place on the top side facing away from the four wire ( 22 ). 3. Machine according to claim 1 or 2, characterized in that a gap former ( 16 ) is provided for forming the insert (E), which comprises a forming element in particular formed by a forming roller ( 24 ), and in that the sheet formation of the insert (E ) with a higher fines content on the forming element side. 4. Machine according to one of the preceding claims, characterized in that the jet direction of the insert former ( 16 ) associated headbox ( 26 ) of the jet direction of the back layer former ( 14 ) associated headbox ( 28 ) is generally opposite. 5. Machine according to one of the preceding claims, characterized in that the insert (E) on a in the region of the rubber in question ( 20 ) provided rubber roller ( 30 ) is reversed. 6. Machine according to one of the preceding claims, characterized, that the upper part of the rüc position (R) with the lower fines content Top side of the insert (E) is squashed. 7. Machine according to one of the preceding claims, characterized in that for forming the top layer (D) a Fourdrinier former ( 18 ) is easily seen and the sheet formation of the top layer (D) with a higher fines content on the top side of the Fourdrinier sieve ( 36 ). 8. Machine according to one of the preceding claims, characterized in that with the insert (E) to be rubberized top layer (D) on egg ner in the region of the rubber zone ( 40 ) provided rubber roller ( 42 ) is reversed. 9. Machine according to one of the preceding claims, characterized, that the upper side of Dec core position (D) with the Un is sieved on the sieve side of the insert (E). 10. Machine according to one of the preceding claims, characterized in that the gap former ( 16 ) is associated with a single-layer headbox ( 26 ). 11. Machine according to one of claims 1 to 9, characterized in that the gap former ( 16 ) is a multi-layer headbox ( 26 ) is assigned. 12. Machine according to one of the preceding claims, characterized, that for web drainage constant pressure drainage elements are provided.