EP1389512B1 - Apparatus for making webs - Google Patents

Abstract

The machine (10) to produce a fiber web (12), e.g. for the production of fiberboards, has a recirculating press belt (14) forming a press gap (20) with a counter surface (16) at a drum (18). A number of successive adjustable bending press rollers (22) are deployed in the direction (L) of web travel, to press the belt with the web against the counter surface. The machine components are held and positioned by at least one end wall (26) of a column (24). The column wall has openings (28) for the installation and/or removal of the press rollers and/or supporting guides.

Description

The invention relates to a device for producing webs with a circumferential, with a moving counter surface forming a press nip press belt, with a plurality of successive webs in the direction of web travel through which the rotating press belt in the press nip region against the moving mating surface can be pressed, and with a particular storage certain stand elements serving, at least one frontal wall having stand.

In the field of fiber and particle board production, a quantity of chip or fiber provided with 6 to 22% glue is usually compacted between a heated drum and a circulating steel strip to form slabs. The diameter of the drum is usually in a range of 2 to 5 m. The resulting plates usually have a thickness in a range of 1.5 to 12 mm. The also hot steel strip is by at least one roller (see, eg DE 42 43 917 C ) pressed against the drum. In older devices of the type mentioned, the rollers have a relatively large mutual distance. In the area between the rollers, which are relatively distant from each other, however, only a relatively low contact pressure on the fiber cake, which may, for example, be in the range of 20 to 25 N / cm ² , results from the strip tensile stress. On the other hand, the line load between a relatively hard roller and the drum may be, for example, 10,000 N / cm. At one of the EP 0 776 742 B known device of the mentioned type, the rollers are now closer together in the web running direction, whereby on the one hand reduces the time interval of the force peaks on the fiber cake and on the other hand, the contact pressure is maintained on the fiber cake between the force peaks at a higher level. To optimize the system so far only the way has been taken to replace relatively few larger rolls with a diameter of for example about 1.5 m by a plurality of directly adjacent smaller rolls with a diameter of for example about 0.32 m.

However, difficulties arise in connection with a respective removal of the rollers for a respective maintenance. Disassembly or separation of the rolls enclosing, e.g. about 3 mm thick steel strip is associated with a very high cost and correspondingly high costs. On the front side, the machine stand in the existing systems stands in the way of unobstructed expansion.

The invention has for its object to further optimize the device of the type mentioned. In particular, the installation and / or removal of the rollers should be facilitated.

This object is achieved in that for the installation and / or removal of the rollers provided as deflection rollers a frontal wall of the stand is provided with openings and / or the installation or removal of the deflection adjustment supportive guide means are provided. In this case, the deflection adjustment rollers are expediently provided in each case with a roller jacket that can be adjusted relative to the yoke in the press plane, ie designed as so-called self-adjusting rollers.

Due to this design, the installation or removal of the rollers now provided as deflection rolls is considerably simplified, which also reduces the costs accordingly. The previously required for a particular installation or expansion longer, sometimes several hours of production interruptions are avoided. Due to the design according to the invention, the deflection adjustment rollers can be inserted and / or removed even without interrupting production.

The guide means preferably comprise at least one entry aid and / or at least one extension aid.

Advantageously, the guide means are at least partially provided for an axial installation or removal of the deflection adjustment rollers. In a preferred practical embodiment of the device according to the invention, the guide means comprise at least one guide rail parallel to the press nip, viewed in the press plane.

The deflection adjustment rollers may each comprise a circumferential roll shell, a non-rotatable yoke passing through the roll shell, and pressing elements arranged between the roll shell and the yoke. As already mentioned, the deflection adjustment rollers are preferably provided with a roller jacket that is adjustable relative to the yoke in the press plane, ie, designed as so-called self-adjusting deflection adjustment rollers.

In an expedient practical embodiment, at least one of the openings provided in the end-side stud wall is directly opposite the site of use of the respective deflection-adjusting roller. In certain cases, however, it may also be advantageous if at least one of the openings provided in the front-side stator wall is offset relative to the location of use of the respective deflection-adjusting roller. In both cases, the deflection adjustment rollers can be installed or removed through the respective openings.

The press nip formed between the revolving press belt and the moving counter surface can be heatable on one side or on both sides. The press nip preferably has a curved course. The moving counter surface can be formed in particular by a rotating press drum. In this case, the guide means may comprise, for example, according to a convenient practical embodiment, at least one viewed in the press plane on a circular arc to the outer periphery of the press drum parallel guide rail.

In an expedient practical embodiment of the device according to the invention, the press belt is guided both over a portion of the counter-surface forming press drum as well as over tensioning and / or guide rollers.

The moving counter surface or the surrounding press drum is preferably heated.

The revolving press belt may advantageously be formed by a steel band.

Also, the rotating press belt or steel strip is preferably reheatable. For heating the steel strip, for example, an induction heating can be provided.

In a preferred practical embodiment of the device according to the invention, the successive deflection web rolls in the web running direction are arranged at least partially close one behind the other. These deflection adjustment rollers can also be grouped together, for example. Within each group, the deflection adjustment rollers are then arranged as close as possible in succession, while between two respective groups in each case a relatively larger distance can be provided.

The device according to the invention is advantageously applicable in particular for the production of slab plate webs, particle board webs and / or the like which can be divided into individual slabs from a lignocellulosic and / or cellulose-containing particle and at least one nonwoven containing in particular a thermosetting binder.

The device according to the invention is advantageously particularly applicable for the production of pulp, chip, HDF, MDF, LDF and / or OSB boards.

One of the essential features of the invention therefore also lies in particular in the use of deflection adjustment rollers in connection with devices for fiber and chipboard production.

In principle, the device according to the invention can also be used, for example, in a paper machine, a calender or a machine for producing decorative paper.

In the US-A-2002/0108520 is described a method for maintaining a central roller mounted between two side parts and printing machine units arranged on the circumference thereof, wherein a window is provided in the operating-side side part for each ink unit, via which the plate cylinder and the applicator roll of the respective ink unit are accessible.

Any other uses are conceivable. However, preferred is a use in the production of fiberboard, chipboard and decorative paper.

The invention is explained below with reference to an embodiment with reference to the drawings.

The single FIGURE of the drawing shows a schematic representation of a device 10 for the production of webs 12, which in particular to be divided into individual plates fiberboard sheets, particle board tracks and / or the like from a lignocellulosic and / or cellulose-containing particles and at least one thermosetting binder containing Fleece can act. The device 10 can also be used for example for producing HDF, MDF, LDF and / or OSB boards or for producing decorative paper.

As based on the FIG. 1 can be seen, the device 10 comprises a formed for example by a steel strip circulating press belt 14, which defines a press nip 20 with a moving counter-surface 16, which is formed here for example by the surface of a press drum 18, in which the starting material used to produce the material web 12 is compacted.

The device 10 further comprises a plurality of successive in the web direction L deflection adjustment rollers 22, through which the rotating press belt 14 in the press nip region against the moving mating surface 16, here against the press drum 18 can be pressed.

For storage of certain device elements, a stand 24 is provided, of which in the single figure an end wall 26 can be seen.

For the installation and / or removal of the deflection adjustment rollers 22, the end wall 26 of the stand 24 is provided with openings 28 through which the deflection adjustment rollers 22 can be installed and / or removed.

The deflection adjustment rollers 22 each comprise a circumferential roll shell, a non-rotatable yoke passing through the roll shell and also pressing elements arranged between the roll shell and the yoke. In this case, these deflection adjustment rollers 22 are preferably each provided with an adjustable in the press plane relative to the yoke roll shell, i. each executed as a so-called self-adjusting roller.

Alternatively or additionally, also the installation or removal of the deflection adjustment rollers 22 supporting guide provided be. Such guide means may include, for example, at least one entry aid and / or at least one extension aid.

The guide means may be at least partially provided for an axial installation or removal of the deflection adjustment rollers 22. For example, they may also comprise at least one guide rail or the like parallel to the press nip 20 as viewed in the press plane. For example, such an embodiment is conceivable in which the guide means comprise at least one guide rail parallel to the outer circumference of the press drum 18 viewed in the press plane on a circular arc.

The openings 28 provided in the end-face stator wall 26 may be directly opposite the location of use of the respective deflection-adjusting rollers 22 or may be offset relative to these. In both cases, the deflection adjustment rollers 22 can be installed or removed through the respective openings 28.

The press nip 20 formed between the circulating press belt 14 and the moving counter-surface 16 or the press drum 18 is heatable at least on one side and preferably on both sides. Thus, for example, both the press drum 18 and the press belt 14, which is preferably formed here by a steel belt, can be heated. For heating the press belt 14, in particular an inductive heating can be provided.

As can be seen with reference to the single FIGURE, the press belt 14 formed, for example, by a steel band is both over a partial region of the press drum 18 forming the counter surface 16 and via clamping and / or guide rollers 30 out. In this case, the roll 30 provided in the entry area of the press nip 20 can simultaneously serve as a press roll over which the press belt 14 can be pressed against the press drum 18.

Moreover, it can also be seen from the single figure that the deflection adjustment rollers 22 are divided into two groups. In this case, the deflection adjustment rollers 22 within the two groups are each arranged relatively close one behind the other. In contrast, a larger distance is provided between the two groups of rollers.

The device 10 just described can advantageously be used to produce fibreboard webs, particle board webs and / or the like which can be divided into individual boards from a lignocellulosic and / or cellulose-containing particle and at least one nonwoven comprising thermosetting binder. It is particularly useful for the production of pulp, chip, HDF, MDF, LDF and / or OSB boards. In principle, use in a paper machine, a calender, a machine for producing decorative paper and / or the like is also conceivable.

LIST OF REFERENCE NUMBERS

10

contraption

12

web

14

press belt

16

counter surface

18

press drum

20

press nip

22

deflection

24

stand

26

frontal wall

28

opening

30

Tensioning and / or deflection roller

L

Web direction

Claims (21)

1. An apparatus (10) for the manufacture of material webs (12) having a circulating press belt (14) forming a press nip with a moved counter-surface (16), having a plurality of sequential rolls (22) in the running direction (L) of the web and through which the circulating press belt (14) can be pressed against the moved counter-surface in the press nip region, as well as having a stand (24) in particular serving for the support of specific elements of the apparatus and having at least one wall (26) at an end face,
   characterised in that
   an end-face wall (26) of the stand (24) is provided with openings (28) for the installation and/or removal of the rolls provided as deflection controlled rolls (22); and/or in that guide means are provided which support the installation and/or removal of the deflection controlled rolls (22).
2. An apparatus in accordance with claim 1, characterised in that the guide means include at least one moving in means and/or at least one moving out means.
3. An apparatus in accordance with claim 1 or 2, characterised in that the guide means are provided at least in part for an axial installation and/or removal of the deflection controlled rolls (22).
4. An apparatus in accordance with any one of the preceding claims, characterised in that the guide means include at least one guide rail parallel to the press nip (20) viewed in the pressing plane.
5. An apparatus in accordance with any one of the preceding claims, characterised in that the deflection controlled rolls (22) each include a circulating roll jacket, a rotationally fixed yoke passing through the roll jacket as well as pressing elements arranged between the roll jacket and the yoke.
6. An apparatus in accordance with claim 5, characterised in that at least one deflection controlled roll (22) is provided with a roll jacket adjustable relative to the yoke in the pressing plane.
7. An apparatus in accordance with any one of the preceding claims, characterised in that at least one of the openings (28) provided in the end-face stand wall (26) is disposed directly opposite the location of the respective deflection controlled roll (22).
8. An apparatus in accordance with any one of the preceding claims, characterised in that at least one of the openings (28) provided in the end-face stand wall (26) is offset with respect to the location of the respective deflection controlled roll (22).
9. An apparatus in accordance with any one of the preceding claims, characterised in that the press nip formed between the circulating press belt (14) and the moved surface (16) can be heated at at least one side.
10. An apparatus in accordance with claim 9, characterised in that the press nip (20) can be heated at both sides.
11. An apparatus in accordance with any one of the preceding claims, characterised in that the press nip (20) has a curved extent.
12. An apparatus in accordance with any one of the preceding claims, characterised in that the moved counter-surface (16) is formed by a revolving press drum (18).
13. An apparatus in accordance with claim 12, characterised in that the guide means include at least one guide rail on an arc of a circle parallel to the outer periphery of the press drum (18) viewed in the pressing plane.
14. An apparatus in accordance with claim 12 or claim 13, characterised in that the press belt (14) is guided both over a part region of the press drum (18) forming the counter-surface and over clamping and/or deflection rolls (30).
15. An apparatus in accordance with any one of the preceding claims,
    characterised in that the moved counter-surface (16) or the revolving press drum (18) can be heated.
16. An apparatus in accordance with any one of the preceding claims,
    characterised in that the circulating press belt (14) is formed by a steel band.
17. An apparatus in accordance with claim 16, characterised in that the circulating press belt (14) or steel band can be heated.
18. An apparatus in accordance with any one of the preceding claims, characterised in that the deflection controlled rolls (22) sequential in the running direction (L) of the web are arranged at least partly closely behind one another.
19. Use of the apparatus (10) in accordance with any one of the preceding claims for the manufacture of fibre plate webs, chipboard webs and/or the like which can be divided into individual plates and which are made from a fleece including particles containing lignocellulose and/or cellulose and at least one binding agent, in particular a heat-curing binding agent.
20. Use of the apparatus (10) in accordance with any one of the preceding claims for the manufacture of chipboards, HDF boards, MDF boards, LDF boards and/or OSB boards.
21. Use of the apparatus (10) in accordance with any one of the preceding claims in a paper making machine, a calender or a machine for the manufacture of decoration paper.

Images