EP0857566A2 - Continuously working press - Google Patents

Abstract

The slideway lining (3) of the press comprises a main centre section (12), and at least one pair of edge strip sections (13) layed symmetrically to the lining centre. Transition sections (14) are provided between the main and edge strip sections, and if necessary, between adjacent edge strip sections. The transition sections are formed without any slots or with blind slots (16) serving neither as inlet nor drain for sliding medium.

Description

The invention relates to a continuously operating double belt press, in particular for producing and / or coating a one or multilayered web of particulate starting material, which between the upper run of a lower and the lower run of a upper, endlessly rotating press belt arrives in the direction of transport, one each over the entire width of the press area and possibly laterally above extending beyond, on an upper and a lower abutment applied grooves composed of individual sections having sliding surface is provided, over which the respectively assigned Press belt by means of a liquid and supplied under pressure optionally heated or cooled lubricant that slides over Feed lines and through feed openings to form a Sliding layer fed to the sliding surface, through discharge openings as well subsequent discharge lines are discharged and in the circuit - if necessary reheated or cooled - fed to the press again becomes.

The basic principle of a continuously operating press of this type is known from EP 0 128 968 A1.

In a continuously operating known from EP 0 491 972 Presses of this type have been taken outside the press area, around the laterally emerging lubricant formed in the sliding surface Swirl grooves, relieve pressure and lubricant dissipate.

From EP 0 344 192 B1 is a plant for the production of chipboard and similar plate materials known when taking measures are provided to be able to manufacture panels of different widths and to avoid that with smaller widths of the fleece fill Problems arise because of the over the edge of the fill no outward pressure on the edges of the forming tapes learn more and no longer sufficiently against their support surfaces or abutment can be pressed. Because of this lack of back pressure heat transfer to the forming belt is also reduced, and there can be an extremely annoying drop in temperature Form tapes towards the edge result in critical thermal stresses, can lead especially in the area of the deflection drums, because there the thermal stresses due to the considerable longitudinal tension of the forming tapes and by deflecting them through the stretch superimposed voltages on the outer fiber, so that there are excessive total tensile stresses on the outside the areas of the forming belts passed over the deflection drums can come.

According to EP 0 344 192 B1 an attempt is made to solve this problem solve that in the free edge areas between the to be pressed Plate and the outer edges of the total pressing area an edge fill of binder-free particles on the lower forming belt is sprinkled and pressed.

This procedure is extremely complex and makes an extensive one Bulk material return required, which is economical such a continuously operating press significantly impaired.

The object of the invention is to provide a continuously operating press genus specified at the beginning with simple technical means so train that problem-free, the tolerance tolerance of each Edge width adjustment ensuring press web can be made can.

According to the invention, this object is achieved according to a first embodiment the double belt press according to the invention essentially thereby solved that the sliding surface has a central main area and at least a pair of symmetrical to the center of the sliding surface Edge strip areas includes, between the main area and the edge strip areas and, if appropriate, between adjacent ones Edging areas provided transition areas are groove-free or with neither an inlet nor an outlet for blind grooves that serve as lubricants.

The task is alternatively also achieved in that the sliding coating middle main area and at least a pair of symmetrical to the center of the sliding covering edge strip areas, the Main area and the verge areas as well as where appropriate several pairs of edge strip areas directly next to each other adjoin, and that adjacent grooves in the main area and in the edge strip areas alternating with feed and discharge openings are provided for the lubricant. This embodiment the double belt press is particularly advantageous in manufacturing and / or coating a web with a relatively small Total finished thickness.

These measures make it surprisingly easy to Panels of different widths in the same continuously working Press with high quality and high tolerance tolerance in the edge areas to produce or to coat such plates, because in the Edge areas of the pressing area used in each case exactly defined Pressure conditions prevail and refer to the respective edge areas no disturbing pressure differences can set.

In the case of the double belt press according to the invention, in which the sliding coating also has transition areas, the number becomes more symmetrical Pairs of edge strip areas, the width of the edge strip areas and the width of the transition areas accordingly given plate widths selected, so that not the currently activated Pressing area area associated edge strip areas deactivated can be d. H. the lubricant circuits that cover these verge areas assigned can either be switched off completely or be greatly reduced in terms of the pressure generated.

In the case of the alternative embodiment of the invention Double belt press in which the sliding surface has a main area and Margin areas, but has no transition areas the number or width of the border strip areas corresponding to the maximum possible press web width selected. In this case it is Width of the web to be pressed advantageously continuously selectable between a minimum and a maximum, each by the number and the width of the edge strip areas are specified. It is not necessary for different widths of the respectively to be pressed Railway lubricant sub-circuits to be provided with regard to the Pressure or the temperature of the lubricant in the different led Margin areas are controlled differently. The Lubricant can be kept in the circuit under a constant predefinable Pressure and predeterminable temperature are performed.

Particularly advantageous embodiments of the invention and expedient Design options for those used in the sliding pads Grooves are specified in the subclaims.

Fig. 1

einen schematischen, teilweise gebrochen dargestellten Querschnitt durch den unteren Teil einer kontinuierlich arbeitenden Presse nach der ersten Ausführungsform der Erfindung,

Fig. 2

eine schematische Darstellung einer Draufsicht auf einen Ausschnitt eines Gleitbelagbereichs der Presse nach Fig. 1, und

Figuren 3 u. 4

schematische, teilweise gebrochen dargestellte Querschnitte durch den unteren und den oberen Teil einer kontinuierlich arbeitenden Presse nach der alternativen Ausführungsform der Erfindung.

The invention is explained in more detail below, for example with reference to the drawing; show in the drawing:

Fig. 1

2 shows a schematic, partially broken cross section through the lower part of a continuously operating press according to the first embodiment of the invention,

Fig. 2

a schematic representation of a plan view of a section of a sliding surface area of the press of FIG. 1, and

Figures 3 u. 4th

schematic, partially broken cross-sections through the lower and the upper part of a continuously operating press according to the alternative embodiment of the invention.

1 shows a lower one according to the first embodiment of the invention Press plate 1, an abutment 2 arranged thereon and one on this abutment 2 supported sliding lining 3 for an endless press belt 4. In the between two opposing press belts 4th formed press nip is a plate formed from a nonwoven 5, the maximum in the example shown for the press in question possible width.

Grooves 6 are formed in the main press area 12 of the sliding lining 3. An edge strip area 13 has grooves 7 and an outer edge area 15 is provided with grooves 8, the main area grooves 6 and the grooves 7 formed in the edge strip area 13 of lubricant supplied with predefinable pressure and temperature and The lubricant is also removed again via these grooves. The feed and It is preferably discharged via adjacent grooves.

The lubricant supplied and discharged via the grooves 6, 7 forms one supportive sliding film for what usually consists of a steel strip Endless press belt 4.

The grooves 8 provided in the outer edge region 15 of the sliding lining 3 serve for swirling, for reducing pressure and for catching the Lubricant emerging laterally from the pressing area 12, 13. This Lubricant collected may be after reheating returned to the lubricant circuit.

Both between the main area 12 and the verge area 13 and between the latter and the outer edge region 15 is in each case a transition area 14 'or 14' 'is provided, with blind grooves 16 is provided. There is neither a supply nor via the blind grooves 16 a drainage of lubricant. The blind grooves 16 thus only provide Recesses in the sliding lining 3, the depth of which is preferably the same that of the grooves 6, 8 in the main area 12 and / or in the outer edge area 15 is.

The arrangement and support of the other side of the plate 5 associated Press bands are carried out in an analogous manner as in FIG. 1 for the lower part is shown.

The top view according to FIG. 2 shows a section of the sliding covering 3 the grooves 6, 7, 8, 16 formed therein as well as the inlet and outlet openings 11 for the lubricant.

The sliding surface 3 consists of a plurality of adjacent arranged sliding lining sections 9, which are indicated by the arrow Press belt running direction are arranged abutting. This sliding lining sections 9 can also cross to the direction of the press belt be divided.

The main area 12 extends to a first transition area 14 ', to which the edge strip area 13 connects. The the outer boundary of a border area 13 subsequent second transition area 14 '' marks the maximum Press surface width. Connects to the second transition region 14 ″ the outer edge area 15, in which the grooves 8 to Swirling and collecting of laterally emerging lubricant in Extend the direction of the press belt. Possible configurations this border area are in the European patent application EP 0 491 972.

It is also possible to have several edge strip areas lying side by side as well as a correspondingly higher number of transition areas be.

The blind grooves formed in the transition regions 14 'and 14' ' 16 are each formed as short, straight-line depressions in the sliding covering 3, that are neither an inlet nor an outlet for lubricants. In principle, the blind grooves 16 can take any shape and also differing from the example in FIG. 2 be directed.

In the press area 12, 13 associated sliding surface 3 are already in the mentioned way grooves 6, 7 for the supply and discharge of the lubricant intended. To ensure problem-free and tolerance tolerance Ensuring edge width adjustment is provided that neither the grooves 6 of the main area 12 nor the grooves 7 of the Edge strip area 13 extend into the transition areas 14 ', 14' '. Likewise, the blind grooves 16 lie exclusively within their respective transition area 14 ', 14' '.

In this way it is possible to press the press belt in accordance with the selected, up to the first transition region 14 'or to press the second transition area 14 '', d. H. to pressurize and at a certain temperature to keep.

For example, the press is operated in such a way that the entire Pressing process takes place in the main area 12 and accordingly the Edge strip areas 13 can not participate in the pressing process, then the separate lubricant circuit assigned to the edge strip areas 13 either completely switched off or greatly reduced in printing be, it can also be ensured that the press belt maintains the same temperature over its entire width and therefore none Problems in the area of the deflection rollers occur.

A fleece is fed to the continuously operating press, the Width of the maximum press area width due to the outer limit of the second transition area 14 '' corresponds to then, of course, those that can in principle be controlled separately Lubricant circuits for the main area 12 and the verge areas 13 operated in the same way.

Those in the preferably composed of sector elements Slides formed grooves including the blind grooves in the Transitional areas can have different shapes, sizes and inclinations own with respect to the direction of the press belt.

2 shows examples of such groove configurations, these Examples are not limiting.

At least some of those in the main area 12 and in FIGS Edge strips 13 provided grooves 6, 7 L-shaped or Z-shaped trained, and at least some of the grooves can consisting of a straight, elongated section and an L-shaped section Section exist, with the short part of the L-shaped section in opens substantially vertically into the elongated section. The Inclination of the grooves 6 in the main area 12 with respect to the direction of the press belt is preferably more pronounced than the inclination of the grooves 7 in the edge strip areas 13. It is expedient the inclination angle in the range of about 10 to 45 °, being constructive there is extensive freedom.

The same shapes can be used for the blind grooves 16 as for the grooves 6, 7 can be selected in the main area 12 or in the edge strip area 13.

Figures 3 and 4 show a section in schematic side view a continuously operating double belt press according to an alternative Embodiment of the invention.

This double belt press has a lower and an upper press plate 1 or 1 ', which are spaced parallel to one another in the vertical direction are arranged. On those facing the middle of this arrangement Sides of the press plates 1, 1 'are a lower and an upper one Abutment 2 or 2 ', on which a lower or an upper sliding lining 3rd or 3 '. Between the two facing sliding surfaces 3, 3 'are a lower and an upper press belt 4 and 4', between those within a predeterminable latitude range of the double belt press a plate or sheet to be pressed is located.

The sliding coating 3, 3 'is along planes that are parallel to the vertical direction and are perpendicular to the paper plane of Figures 3 and 4, in symmetrically in a main area 12, a pair of to the Main area 12 each immediately adjacent edge strip areas 13 and a pair of each directly to an edge strip area 13 adjacent outer edge areas 15 divided. In the illustration FIGS. 3 and 4 each have only one edge strip area 13 and an outer edge region 15 is shown. The sliding pads 3, 3 'instruct the sides facing the press belts 4, 4 'in the main area 12 grooves 6 and in the edge strip area 13 grooves 7, each one have feed or discharge opening, not shown in Figures 3 and 4. In the outer edge region 15, the sliding linings 3, 3 'have grooves 8, which are preferably each have a discharge opening, not shown.

The double belt press shown in FIGS. 3 and 4 thus has one similar basic structure to that of the double belt press shown in FIG. 1. In contrast to that first embodiment of the invention it has no transition areas 14 ', 14' 'between the Main area 12 and the edge strip areas 13 or between the Edge strip areas 13 and the outer edge areas 15.

The double belt press according to the invention according to FIGS. 3 and 4 is for the continuous production or coating of single or multi-layer Lanes 5 formed. For this purpose, the web 5 of the as endless steel bands formed press bands 4, 4 'in one direction transported and compressed perpendicular to the plane of the paper. Here becomes the respective gap between the sliding lining 3, 3 'and the press belt 4 or 4 'through openings in the grooves 6 of the main area 12 and in the grooves 7 of the edge strip areas 13 lubricant with predeterminable Pressure and predeterminable temperature are fed in and out again. According to the invention, mutually adjacent grooves 6, 7 in the main area 12 and alternately in the adjacent edge strip areas 13 Lubricant supplied and removed via grooves.

The press belts 4, 4 'thus move on one by the lubricant formed, the press belts 4, 4 'on the sliding pads 3, 3' supporting Sliding film. The provided in the outer edge region 15 of the sliding lining 3, 3 ' Grooves 8 are used for swirling, pressure reduction and Collect the exiting laterally from the edge strip areas 13 Lubricant. At the outer edge of the outer edge region 15 from the respective Gap between sliding lining 3, 3 'and press belt 4 or 4' emerging and draining lubricant 17 is by suitable means caught. In the outer edge areas 15 or at the other Lubricant collected around the edges is replaced after renewed Warming fed back to the lubricant circuit.

In contrast to the double belt press shown in FIGS. 3 and 4 to the embodiment of the invention shown in Figure 1 no transition areas 14 ', 14' 'are required, the width of the areas to be pressed can be Lane 5 is advantageously stepless between a minimun and a maximum can be varied. Here is the minimum by the width of the main area 12 and the maximum by the Given the width of the pairs of edge strip areas 13. Figure 3 shows the pressing of a web 5 which is within the illustrated Double belt press has the maximum possible width. In Figure 4 that is Pressing a web 5 shown minimal width.

It is there for different widths of the web 5 to be pressed it is not necessary to activate different lubricant sub-circuits or switch off or greatly reduce the pressure generated. It is therefore particularly possible for the supply and discharge of the lubricant through the grooves 6, 7 within one in the direction of the press belt limited portion of the main area 12 and the fringe areas 13 to provide a single circuit.

In the areas in which the two press belts 4, 4 'the web 5 is not act, so at least in the two outer edge regions 15, the two press belts 4, 4 'lie essentially directly against one another on. Therefore, the double belt press shown in Figures 3 and 4 particularly suitable for producing or coating a one or multilayered web of particulate starting material or a single or multi-layer resin-impregnated paper web, glass fabric web or glass fiber mat, each of which has a relatively low overall finished thickness exhibit. The double belt press works particularly well with a total finished thickness between 0.7 and 1.5mm.

The formation of the grooves 6, 7, 8 shown in FIGS. 3 and 4 can be done in the same way as shown in Figure 2 and in Connection in connection with Figures 1 and 2 explained. He can also Sliding coating 3, 3 'made of a plurality of adjacently arranged Sliding lining sections exist, which are similar to that in In connection with Figure 2 already described in and / or across Press belt running direction are divided.

REFERENCE SIGN LIST

1

lower press plate

1'

upper press plate

2nd

lower abutment

2 '

upper abutment

3rd

lower sliding surface

3 '

upper sliding surface

4th

lower press belt

4 '

upper press belt

5

Plate or press track

6

Grooves in the main area

7

Grooves in the verge area

8th

Grooves in the outer edge area

9

Sections of the sliding surface

11

Inlet and outlet openings

12th

Main area

13

Margin area

14 ', 14' '

Transition area

15

Outer edge area

16

Blind grooves

17th

draining lubricant

Claims (10)

Continuously working double-belt press, in particular for producing and / or coating a single or multi-layer web made of particulate starting material, which runs in between the upper run of a lower and the lower run of an upper, endlessly rotating press belt in the transport direction, one over each other the entire width of the press area and optionally laterally extending, on an upper and a lower abutment, composed of individual sections, having grooves, is provided over which the respectively assigned press belt slides by means of a liquid lubricant fed under pressure and optionally heated or cooled , which is fed to the sliding coating via feed lines and through feed openings to form a sliding layer, is discharged through discharge openings and subsequent discharge lines and in the circuit - if necessary reheated or cooled - is fed to the press again,
characterized, that the sliding coating (3, 3 ') comprises a central main area (12) and at least a pair of edge strip areas (13) which are symmetrical to the center of the sliding covering, with between the main area (12) and the edge strip areas (13) and optionally between adjacent edge strip areas (13 ) Transition areas (14 ', 14'') are provided which are designed to be groove-free or are provided with blind grooves (16) which serve neither as an inlet nor as an outlet for lubricants. Press according to claim 1,
characterized, that the number and / or the width of the pairs of edge strip areas (13) and / or the width of the transition areas (14 ', 14'') is selected in accordance with predetermined plate widths and / or that at the outermost edge strip areas (13) each a further transition area (14 ') and then an outer edge area (15) adjoins, the outer edge area (15) preferably extending in the direction of the press belt for grooves (8) for swirling and collecting is provided with lubricant emerging from the side. Press according to claim 1 or 2,
characterized, that mutually adjacent grooves (6, 7) in the main area (12) and in the edge strip areas (13) are alternately provided with feed and discharge openings (11) for the lubricant. Press according to one of the preceding claims,
characterized, that the grooves (7) in the edge strip areas (13) for plates (5), the width of which lies between the main area width and the total width of the main area (12) and the mutually adjacent transition areas (14 '), can be used as pressure reduction and lubricant collecting grooves and /or that the blind grooves (16) in the transition areas (14 ', 14'') are aligned or aligned differently. Continuously working double-belt press, in particular for producing and / or coating a single or multi-layer web made of particulate starting material, which runs in between the upper run of a lower and the lower run of an upper, endlessly rotating press belt in the transport direction, one over each other the entire width of the press area and optionally laterally extending, on an upper and a lower abutment, composed of individual sections, having grooves, is provided over which the respectively assigned press belt slides by means of a liquid lubricant fed under pressure and optionally heated or cooled , which is fed to the sliding coating via feed lines and through feed openings to form a sliding layer, is discharged through discharge openings and subsequent discharge lines and in the circuit - if necessary reheated or cooled - is fed to the press again,
characterized, that the sliding coating (3, 3 ') comprises a central main area (12) and at least a pair of edge strip areas (13) which are symmetrical with respect to the center of the sliding covering, the main area (12) and the edge strip areas (13) and optionally the plurality of pairs of edge strip areas (13) 13) directly adjoin each other, and that mutually adjacent grooves (6, 7) in the main area (12) and in the edge strip areas (13) are alternately provided with feed and discharge openings (11) for the lubricant. Press according to claim 5,
characterized, that mutually adjacent grooves (7) in adjacent edge strip areas (13) are alternately provided with feed and discharge openings (11) for the lubricant and / or that the lubricant can be carried out in the circuit under a constant predetermined pressure and temperature. Press according to claim 5 or 6,
characterized, that the number and / or the width of the pairs of edge strip areas (13) is selected in accordance with the maximum possible press web width and / or that the width of the web (5) to be pressed can be continuously selected between a minimum and maximum predetermined by the number and the width of the pairs of edge strip areas (13) and / or that an outer edge region (15) connects to the outermost edge strip regions (13), the outer edge region (15) being provided with grooves (8), which preferably extend approximately in the direction of the press belt, for swirling and collecting lubricant emerging from the side. Press according to one of the preceding claims,
characterized, that the elongated grooves (6, 7) in the main area (12) and in the edge strip areas (13) are at least partially inclined with respect to the direction of the press belt running,
in particular the inclination of the grooves (7) in the edge strip areas (13) of the sliding lining (3, 3 ') is less than in the main area (12). Press according to one of the preceding claims,
characterized, that at least some of the grooves (6, 7, 16) are L-shaped, or are essentially Z-shaped, the individual sections of these grooves (6, 7, 16) being in particular at right angles to one another, or from a straight line, elongated section and an L-shaped section, the short portion of the L-shaped section opening substantially perpendicularly into the elongated section. Use of a press according to claim 5 for manufacturing and / or coating a single or multi-layer web Particulate starting material or one or more layers resin-impregnated paper web, glass fabric web or glass fiber mat, all the above-mentioned sheets or the glass fiber mat in particular each have a laminated copper foil.

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