EP3753724A1 - Press plate set and method for producing a press pad - Google Patents

Abstract

The present application relates to a method for producing a press pad (5) which is intended for use in a hydraulic hot press system (2), comprising the following method steps: a) A design of a press sheet (4), by means of which a surface is Pressing the pressed part (3) is predefined, the press plate (4) having a press relief (8) so that by pressing the press plate (4) into a surface layer of the pressed part (3) in the pressed part (3 ) a surface structure (9) corresponding to the press relief (8) can be produced. b) a press cushion (5) tailored to the dimensions of the press plate (4) is produced, warp threads (17) and weft threads (18) forming a fabric (6) In order to provide a method for producing a press cushion (5) with which press cushions which are improved compared to the prior art can be produced, it is proposed according to the invention that Depending on the press relief (8), material (12) is applied to the fabric (6) at least at one point on at least one side of the press pad (5), the point corresponding to a high area (10) of the press relief (8) so that the press pad (5) receives a thickening (11) at the point.

Description

introduction

The present invention relates to a method for producing a press cushion according to the preamble of claim 1. Furthermore, the present application comprises a press plate set according to the preamble of claim 7.

The hydraulic heating press system can in particular be designed in the form of a hydraulic multi-opening heating press.

State of the art

Press cushions are used in a hot press system to bring about an even distribution of force between a hydraulically driven hot press and a press plate that comes into direct contact with a respective pressed part. As a rule, the press plate has a designed surface that has a press relief. This press relief is pressed or pressed into a surface of the respective pressed part in the course of a pressing process, so that a negative of the press relief results, so to speak, in the surface of the pressed part. At the moment of the pressing process, the compact has a soft consistency at least in the area of its surface, the compact typically comprising a melamine resin layer. This soft consistency enables the press relief of the press plate to be pressed into the pressed part, with the soft material of the pressed part giving way and being locally compressed.

As a result of the thermal energy introduced into the compact by means of the heating press, the compact is finally cured to such an extent that the pressed-in surface structure, which corresponds to the negative of the structure of the press relief, remains permanently. In order to make the surface of the compact uniform and thus visually appealing, it is important that the pressing pressure applied by means of the hot press system is uniformly transferred to the press plate and finally to the compact. As stated above, the press cushion serves to transfer the pressing pressure from the heating press to the press plate in a uniform manner.

From the DE 20 2015 006 923 U1 For example, a press pad is known which compensate for thickness tolerances and which may be required differently Thermal conductivity should be taken into account. For this purpose, the final crosslinking of the known press cushion should take place in a first pressing process in the press.

Another example of a press pad is from DE 35 16 645 C2 known, wherein the press pad is to apply a plastic film true to the contour on a structured surface of a wooden panel. Accordingly, the press pad has corresponding thickenings at indentations in the wooden panel, so that the plastic film to be applied reliably comes into contact with the surface at the indentation.

Furthermore, from the DE 20 2016 000 367 U1 a press cushion known, which should be optimized with regard to the compensation of thickness tolerances and temperature differences within the press system. For this purpose, a support fabric made of metallic metal threads is printed with a cushion layer made of silicone using a 3D printing process, taking into account the thickness tolerances of the press system, press plates and wood-based panels. Compensating for the thickness tolerances is intended to ensure that there is a faster and more even heat flow through the heating plate and material to be pressed.

The production quality of artificially designed surface structures of pellets, which can in particular reproduce natural wood grain and wood surface structures, has increased significantly in recent years. This is due in particular to the fact that embossing depths that are introduced into the compact have increased so that the reproduction of natural surface structures could be successfully improved. The introduction of such deep surface structures with high embossing depths requires the use of press plates, the press reliefs of which are particularly pronounced and are equipped with raised areas, the height of which, measured perpendicular to a press plate plane and related to the press plate plane, corresponds to a desired depth of the respective local surface structure of the pressed part. It goes without saying that the introduction of a particularly deep local surface structure in the respective compact, conversely, analogously, requires a particularly high high area of the press relief of the press plate. Pressing such a press plate, which has a press relief provided with such high areas, into a respective pressed part has the result that the resistance, which acts in the form of a reaction force on the press plate, is very different locally across the surface of the press plate. Pressing a high area into the surface of the compact therefore requires a greater force than pressing a structure of the press relief that hardly protrudes from the plane of the press plate. In practice, this means that the necessary force that is required for complete press-in is also the Requires high areas of the press relief in the pressed part, cannot be reliably transferred to the press plate.

task

The object of the present application is to provide a method for producing a press cushion with which press cushions which are improved compared to the prior art can be produced. A further object of the present invention is to provide a press plate set which is improved over the prior art.

solution

The underlying object is achieved according to the invention by means of a method for producing a press cushion with the features of claim 1. Refinements according to the invention emerge from subclaims 2 to 6.

The method according to the invention is characterized by the step that, depending on the press relief, material is applied to the fabric at least at one point on at least one side of the press cushion, the point corresponding to a high area of the press relief so that the press cushion is thickened at the point .

The method according to the invention has many advantages. In particular, it enables the production of a press cushion, by means of which reliable force transmission to the respective press plate is ensured in the course of a pressing process, since the press cushion is individually adapted to the design of the press plate or the structure of the associated press relief. The material applied to the fabric is particularly suitable for individually adapting a thickness of the press pad to a respective press sheet which is designed with a specific press relief. Thus, for example, at a point on a press plate, the press relief of which has a particularly pronounced high area locally, the press pad individually tailored to the respective press sheet can be provided with the applied material at a point corresponding to the high area of the press sheet, by means of which the thickness of the fabric of the press pad is increased accordingly. This thickening has the technical effect that the press pad is less compressible than this in an effective area of the thickening that corresponds to the local high area of the press relief in the presence of a reaction force that occurs as a result of the increased resistance in the course of pressing the press sheet into the pressed part would be the case without the thickening. This will ensure that the with the high range formed structure of the press relief is reliably fully pressed into the compact and as a result the desired surface structure of the compact is formed.

Another essential technical advantage of the press pad produced with the method according to the invention is that the press pad has a low thermal conductivity in the area of the thickening. This has the technical effect that the thermal energy made available by means of the heating press is not transferred to the press plate in the same way as in a situation in which the thickening would not be present. In other words, the heat transfer between the heating press and the press plate is "braked" by means of the thickening. This has the particular advantage that the material of the surface layer of the pressed part hardens less quickly in the effective area of the thickening and consequently more time is available in which the material can evade the high area of the structure of the press relief of the pressed sheet metal. In contrast, particularly rapid hardening of the pressed part would make it more difficult to introduce a particularly deep surface structure, since the viscosity of the material of the pressed part in the area of its surface layer would increase particularly quickly in the course of the pressing process, which in turn would make it more difficult to press the respective high area of the press relief into the surface layer .

The material, i.e. the printing medium, can be a self-curing or radiation-curing material. Furthermore, additives can be added to the printing medium, which further reduce the thermal conductivity and / or increase the compressive strength.

With regard to the design of the at least one thickening that is matched to the high area of the press plate, it should be noted that the thickening at the useful temperature, i.e. when the hot press system is in operation, corresponds exactly to the high area of the press relief. Accordingly, the various thermal expansions of the press cushion and the press plate at the useful temperature are taken into account during the production of the press cushion, so that the press cushion does not correspond optimally to the press sheet at room temperature, but does at the useful temperature.

According to an advantageous further development of the invention, the press pad is provided with a large number of thickenings, the thickenings preferably being linear. This allows the impression of joints to be created in the compact.

Preferably, the application of material is carried out differently at different points of the fabric, so that local thicknesses of the press pad are different for different thickenings. This is advantageous insofar as an equally irregular design of a structure by means of an irregular distribution a press relief of a press plate can be modeled, so that the thickenings act precisely in those areas of the press cushion in which an effect is desired and necessary in view of the design of the press relief of the press plate. In particular, it is advantageous to adapt a respective press cushion according to the invention individually to the design of a respective press sheet or a respective surface structure of a pressed part.

In further developing the method according to the invention, material is applied to the fabric on both sides of the press cushion, with at least one application of material preferably taking place for both sides at the same point of the fabric. This makes it possible to achieve particularly large thickenings and thus to depict a particularly high high area of the press relief.

In a particularly advantageous embodiment of the method according to the invention, the material is applied by means of material printing, in particular by means of a 3D printer or by means of screen printing. By means of a material print, even complex press reliefs can be reproduced in great detail, so that the quality of the press cushion produced and thus also the quality of the processed compact are optimized. In the case of material printing, partial printing can take place so that the material is actually applied only in areas in which a thickening of the press cushion is desired. Accordingly, there is currently no full-surface application. The application of material by means of a material print also has the advantage that it can take place automatically, with, for example, a printer head being movable in a plane parallel to a surface of the press cushion and in this way being able to apply material to the press cushion at predetermined locations. Such an order is also possible with particular precision.

In a further advantageous embodiment of the method according to the invention, the material is formed from a rubber, in particular a silicone rubber, which after its application is crosslinked to form an elastomer by means of a UV radiator. Rubber, in particular silicone rubber, is particularly well suited to ensure the necessary elasticity of the press pad, with the low thermal conductivity of the elastomeric material also preventing excessive transfer of thermal energy from the heating press to the press plate.

The underlying object is also achieved according to the invention by means of a press plate set with the features of claim 7. Advantageous configurations of this press plate set emerge from subclaims 8 to 13.

The press sheet set according to the invention comprises at least one press sheet and at least one press pad assigned to the press sheet, the press sheet having a press relief provided with a structure which has a plurality of raised areas protruding over a press sheet plane, the press pad comprising a fabric that extends from in a warp direction Warp threads and weft threads running in a weft direction is formed. According to the invention, the press plate set is characterized in that the press pad has a thickening on at least one side at at least one point that corresponds to a high area of the press plate, the thickening being formed by material applied to the fabric.

The press plate set according to the invention can be produced particularly easily by means of the method according to the invention. The advantages of the press plate set according to the invention result analogously to the advantages which are given with regard to the method described above. In particular, the press pad is designed to be thickened in high areas of the structure of the press relief by means of the application of material, so that the reaction forces acting at these points or in these areas of the press plate can be reliably applied in the course of the pressing process. As a result, the press plate with its respective high area is pressed completely into the compact, so that the desired surface structure is established in the compact. There is also the technical advantage that the press pad has a lower thermal conductivity in the area of the thickening, so that the heat transfer between the heating press and the press plate is reduced in the area of the thickening. As a result, the material of the surface layer of the compact hardens less quickly in the area of the thickening and has more time to evade the high area of the structure of the press relief of the press plate.

According to an advantageous development of the press plate set according to the invention, the material is formed from an elastomer, preferably a silicone elastomer. As a result, the press pad has particularly good elasticity and low thermal conductivity in the area of the thickening.

The press pad preferably has a plurality of thickenings, so that a respective press pad according to the invention can be individually adapted to the design of a respective press sheet or a respective surface structure of a pressed part.

In this context, it is also advantageous if at least two thickenings are so differently pronounced that the thicknesses of the press pad are different at the locations of the differently pronounced thickenings. By means of this Design, differently pronounced high areas of the press relief of the press plate can be taken into account.

Furthermore, according to a further advantageous embodiment of the press plate set according to the invention, it is provided that at least two thickenings have different widths and / or lengths. This allows individual press reliefs to be reproduced on the press pad. The thickenings can in particular be strip-shaped.

In a further advantageous embodiment of the press sheet set according to the invention, at least one thickening - viewed in the cross section of the press pad - is rounded on at least one edge, preferably on both opposing edges, the thickness of the press pad preferably starting from an area in which there is no thickening steadily increases to a high point of thickening. During the pressing process, no stress peaks form at the said edge, as would be the case with a sudden increase in thickness in the manner of a step. Rather, in this way, a uniform increase in forces that act on the press pad and on the press plate and the pressed part in the area of the thickened areas is achieved. This has advantages in particular with regard to the longevity of the press cushion.

Finally, a further development of the press plate set according to the invention provides that the press cushion has at least one thickening on both sides, preferably at least two thickenings, one of which is assigned to one of the sides of the press cushion, being arranged at the same point of the press cushion. It is thus possible to depict a particularly high high area of the desired press relief.

Embodiments

Fig. 1:

Ein Querschnitt durch eine Heizpressanlage, die mit einem erfindungsgemäßen Pressblechset ausgestattet ist,

Fig. 2:

Eine Draufsicht auf ein Design einer Oberflächenstruktur eines Presslings,

Fig. 3:

Eine Draufsicht auf ein alternatives Design einer Oberflächenstruktur eines Presslings,

Fig. 4:

Eine schematische Darstellung einer Draufsicht auf ein erfindungsgemäßes Presspolster,

Fig. 5:

Ein schematischer Querschnitt durch ein erfindungsgemäßes Pressblechset und

Fig. 6 bis Fig. 10:

Weitere schematische Querschnitte von erfindungsgemäßen Pressblechsets.

The invention is explained in more detail below on the basis of exemplary embodiments which are shown in the figures. It shows:

Fig. 1:

A cross section through a hot press system equipped with a press plate set according to the invention,

Fig. 2:

A top view of a design of a surface structure of a compact,

Fig. 3:

A top view of an alternative design of a surface structure of a compact,

Fig. 4:

A schematic representation of a top view of a press cushion according to the invention,

Fig. 5:

A schematic cross section through a press plate set according to the invention and

Fig. 6 to 10:

Further schematic cross-sections of press sheet sets according to the invention.

An embodiment that is in the Figures 1 to 7 is shown relates to a press plate set 1 according to the invention, which is installed in a hot press system 2 for processing a pressed part 3 . The press plate set 1 comprises a press plate 4 and a press pad 5 , the press pad 5 being formed by a fabric 6 .

The press pad 5 is arranged between a heating press 7 of the heating press system 2 and the press plate 4 , so that a force is transmitted between the heating press 7 and the press plate 4 by means of the press pad 5 . The press pad 5 serves to equalize the forces between the heating press 7 and the press plate 4 so that the pressure force provided by the heating press 7 is evenly applied to the press plate 4 over its surface.

In the example shown, the press plate 4 has a press relief 8 , by means of which a surface structure 9 can be pressed into the pressed part 3 . The press relief 8 is typically etched into the surface of the associated press plate 4 , so that a designed surface structure is established. Based on Figures 2 and 3 it is illustrated how the design of a surface structure 9 of a compact 3 can be formed, wherein the design of the press relief 8 of an associated press plate 4 must follow this desired design. This is due to the fact that the surface structure 9 is solely due to the design of the press relief 8 , which to a certain extent represents a negative of the surface structure 9 . The press relief 8 of the press plate 4 is pressed into a surface layer of the compact 3 in the course of the pressing process by means of the hot press system 2 , so that depressions are formed in the surface layer of the compact 3 that are complementary to the elevations of the press relief 8 . In particular in order to simulate naturally grown structures which are intended to imitate surface structures, for example of wood-based materials, it is important that the surface structure 9 of the respective pressed part 3 has depressions of different characteristics. In particular, it is of interest to produce particularly deep impressions in the respective pressed part 3 , since these would be equally present in a corresponding natural material. A deep one Pressing-in the compact 3 requires vice versa in the pressing relief 8 of the pressing plate 4, a high-range 10. In such a high range 10 the press relief 8 is comparatively far over a press plate plane of the pressing plate 4 before.

The pressing of such high areas 10 into the surface layer of a respective pressed part 3 requires a comparatively high pressing force which is to be transmitted to the pressing plate 4 . The reaction force caused by the surface layer, which acts on the press plate 4 , can lead to the press cushion 5 being slightly deformed in the course of a pressing process, so that the high areas 10 are not pressed into the surface layer in the same way as in areas of the press relief 8 that are less pronounced or lower in height. This has the effect that the surface structure 9 of the finished compact 3 is not designed in the desired way according to the estimated design, since areas of the compact 3 that should have comparatively deep indentations are not designed as desired.

In order to prevent the press cushion 5 from "deflecting" locally in the high areas 10 of the press relief 8 in the course of the pressing process, the press cushion 5 is provided according to the invention with a thickening 11 which corresponds to the high area 10 of the press plate 4 . The thickening 11 is formed by material 12 applied to the fabric 6 , which material serves to increase a local thickness 13 of the fabric 6 . In the present example, the material 12 is a silicone elastomer. By means of the thickening 11 , the effect is achieved that the press pad 5 or its fabric 6 has a thickness 13 in an effective area 14 of the thickening 11 which, compared to the thickness 15 of the fabric 6 , which is outside the effective area 14 of the thickening 11 , is enlarged. In this respective effective area 14 of one or more thickenings 11 , the tissue 6 is consequently less compressible, as a result of which a local deflection of the press pad 5 in the direction of the heating press 7 is locally prevented in the manner described above. As a result, the pressing plate 4 is reliably pressed into the pressed part 3 even in those areas of the press plate 4 in which the structure of the press relief 8 has corresponding high areas 10 .

Based on the representations of the Figures 2 and 3 This shows, by way of example, in which areas the surface structure 9 of the respective compact 3 is designed to be particularly deep and how effective areas 14 for thickened areas 11 are provided correspondingly individually to the press pad 5 adapted to the design. The example according to Figure 3 relates to a compact 3 which is formed with a plurality of joints 16 . In such an embodiment, individual pressing elements, which are separated from one another by means of the joints 16 , are produced in a single pressing process. In the areas of these joints 16 , the associated press plate 4 has particularly pronounced raised areas 10 , which are suitable for pressing in at least the surface layer of the compact 3 so deep that the finished compact 3 has the corresponding joints 16 in the form of particularly pronounced depressions. The finished compact 3 can then be sawed, for example, along these joints 16 , so that the individual pressing elements result. Such a press pad 5 of the press sheet set 1 according to the invention, which is adapted to the associated press sheet 4 , therefore appropriately had thickened areas 11 in effective areas 14 , which are locally arranged on the press pad 5 at locations that coincide with the high areas 10 of the press sheet 4 , which in turn are responsible for the design of the joints 16 in the compact 3 . Accordingly, according to the invention, the fabric 6 of a respective press pad 5 is fundamentally individually tailored to the design of a respective press plate 4 or the desired design of a surface structure 9 of a respective pressed part 3 , the press plate 4 and the associated press cushion 5 together forming a functional unit in which the advantageous effect of the thickenings 11 is achieved only in combination with the individually associated press plate 4 . According to the invention, provision is accordingly made for a respective press cushion 5 to be individually adapted to a predetermined design of a surface structure 9 of a press sheet 4 , this adaptation being carried out according to the invention by means of the thickenings 11 . The press plate 4 and the press pad 5 are also preferably connected to one another in a force-transmitting manner, so that relative movements between the two components are at least substantially prevented at least in the direction of the plane of the press plate.

A fabric 6 according to the invention, which is shown in Figure 4 is shown is formed in a known manner from warp threads 17 and weft threads 18 which are interwoven. In the example shown, the fabric 6 has a plurality of strip-shaped thickenings 11 , part of the thickenings 11 being oriented in a warp direction and the other part of the thickening 11 being oriented in the weft direction of the fabric 6 . This achieves the effect that the thickness 13 of the fabric 6 in the effective area 14 of the thickenings 11 is increased compared to the thickness 15 of the fabric 6 , which the latter has outside the effective area 14 . This is in Figure 5 illustrated. The cross-section through the fabric 6 shown schematically there is contrasted with a local section of an associated press plate 4 with an individual press relief 8 which has a raised area 10 . The thickenings 11 are arranged individually adapted to the press relief 8 that the effective area 14 in which the thickenings 11 bring about the desired increase in the thickness 13 of the fabric 6 coincides with the high region 10 of the press relief 8 . In this way, the above-described effect is achieved that the press pad 5 in precisely this area of the press plate 4 , in which the greatest resistance to the desired pressing into the surface layer of the pressed part 3 is to be expected in the course of a pressing process, is less compressible, so that the press pad 5 deflects in the direction of the heating press 7 due to the reaction force is counteracted. Furthermore, the press pad 5 has a temperature-inhibiting effect in the area of its thickened areas 11 .

In the Figures 6 to 10 further embodiments of press sheet metal sets 1 according to the invention are shown, the press reliefs 8 and thus also the formation of the thickenings 11 varying. The Figure 6 shows an example in which two differently designed thickenings 11 are implemented, which are adapted in accordance with the high areas 10 of the press plate 4 . The in the Figure 6 Thickening 11 shown on the left is less thick than that in FIG Figure 6 Thickening 11 shown on the right, which is due to the differently pronounced high areas 10 of the press relief 8 .

That in the Figure 7 The press plate set 1 shown also has two raised areas 10 of different heights, the thickening 11, which depicts the more developed high area 10 , being divided into a thickening 11 on a side facing the press plate 4 and a thickening 11 on a side facing away from the press plate 4 . Accordingly, 5 material 12 is applied to both sides of the fabric 6 of the press pad. In this way, the thickening 11 of greater thickness is produced by an additional application of material 12 on the side facing away from the press plate 4 , while the two adjacent thickenings 11 on the side facing the press plate 4 have the same thickness.

Another example of a press plate set 1 according to the invention is shown in FIG Figure 8 shown, wherein the press relief 8 the press relief 8 in accordance with Figure 7 corresponds. In contrast to the press plate set 1 according to Figure 7 are the thickenings 11 in the press plate set 1 in Figure 8 each rounded at the edges 19 , which means that the edges 19 are designed in the manner of a ramp and there is no sudden increase in the thickness of the press pad 5 , but a continuous increase in thickness.

Also show the Figures 9 and 10 Further exemplary embodiments of the press sheet metal sets 1 according to the invention, the press cushions 5 shown therein having a fabric 6 which is embedded in a material 20 in such a way that the press cushion 5 - apart from the thickenings 11 - has an at least substantially flat surface. In addition to the material 20 , the press cushions 5 are provided with the thickenings 11 adapted to the press relief 8 .

The material 12 , which is applied to the fabric 6 of the press pad 5 for the purpose of creating the thickenings 11 , is formed from a silicone elastomer which is applied to the fabric 6 by means of a material printer, which is formed here by a 3D printer.

List of reference symbols

1

Press plate set

2

Hot press systems

3

Pellet

4th

Press plate

5

Press pad

6th

tissue

7th

Heating press

8th

Press relief

9

Surface structure

10

High range

11

thickening

12

material

13

thickness

14th

Effective range

15th

Thickness (fabric)

16

Gap

17th

Warp thread

18th

Weft

19th

edge

20th

material

Claims (13)

A method for producing a press cushion (5) which is intended for use in a hydraulic heating press system (2), comprising the following process steps: a) A design of a press plate (4), by means of which a surface of a pressed part (3) to be pressed by means of the hot press system (2) can be designed, is specified, the press plate (4) having a press relief (8) so that by pressing in the Press plate (4) in a surface layer of the pressed part (3) in the pressed part (3) a surface structure (9) corresponding to the press relief (8) can be produced. b) A press pad (5) tailored to the dimensions of the press plate (4) is produced, warp threads (17) and weft threads (18) being woven into a fabric (6), characterized by the following process step:
c) Depending on the press relief (8), material (12) is applied to the fabric (6) at least at one point on at least one side of the press pad (5), the point corresponding to a high area (10) of the press relief (8) so that the press pad (5) has a thickening (11) at the point. Method according to Claim 1, characterized in that the press cushion (5) is provided with a multiplicity of thickenings (11), the thickenings (11) preferably being linear. Method according to Claim 1 or 2, characterized in that the application of material (12) is carried out differently at different points on the fabric (6), so that local thicknesses (13) of the press pad (5) are different for different thickenings (11). Method according to one of Claims 1 to 3, characterized in that material (12) is applied to the fabric (6) on both sides of the press pad (5), with preferably at least one application of material (12) for both sides at the same point of the tissue (6) takes place. Method according to one of Claims 1 to 4, characterized in that the material (12) is applied by means of a material print, in particular by means of a 3D printer. Method according to one of Claims 1 to 5, characterized in that the material (12) is formed from a rubber, in particular a silicone rubber, which, after being applied, is crosslinked to form an elastomer by means of a UV radiator. Press plate set (1), comprising - at least one press plate (4) and - At least one press pad (5) assigned to the press plate (4), wherein the press plate (4) has a press relief (8) provided with a structure which has a plurality of raised areas (10) protruding above a press plate plane,
wherein the press cushion (5) comprises a fabric (6) which is formed by warp threads (17) running in a warp direction and weft threads (18) running in a weft direction,
characterized in that
the press pad (5) has a thickening (11) on at least one side at at least one point which corresponds to a high area (10) of the press plate (4),
wherein the thickening (11) is formed by material (12) applied to the fabric (6). Press plate set according to Claim 7, characterized in that the material (12) is formed from an elastomer, preferably a silicone elastomer. Press plate set according to Claim 7 or 8, characterized in that the press pad (5) has a large number of thickenings (11). Press plate set according to Claim 9, characterized in that at least two thickenings (11) are differently shaped such that the thicknesses (13) of the press pad (5) are different at the points of the differently shaped thickenings (11). Press plate set according to claim 9 or 10, characterized in that at least two thickenings (11) have different widths and / or lengths. Press plate set according to one of claims 7 to 11, characterized in that at least one thickening (11) - viewed in the cross section of the press pad (5) - is rounded on at least one edge (19), preferably on both opposing edges (19), the thickness (15) of the press pad (5) preferably increasing steadily starting from an area in which there is no thickening (11) up to a high point of the thickening (11). Press plate set according to one of claims 7 to 12, characterized in that the press cushion (5) has at least one thickening (11) on both sides, preferably at least two thickenings (11), one of which is one of the sides of the press cushion (5 ) is assigned, are arranged at the same point of the press pad (5).

Images