EP3325245A1

EP3325245A1 - Mold

Info

Publication number: EP3325245A1
Application number: EP16738723.2A
Authority: EP
Inventors: Norbert Reuber; Michael Ansmann; Christian Kluge; Gerd RÖTTINGER; Maximilian KURTZ
Original assignee: Kurtz GmbH
Current assignee: Kurtz GmbH
Priority date: 2015-07-24
Filing date: 2016-07-08
Publication date: 2018-05-30
Also published as: US20180215084A1; DE102015112149A1; KR101896980B1; WO2017016845A1; KR20180025980A; CN108025464A

Abstract

The invention relates to a mold for an apparatus used for manufacturing particle foam articles. The mold delimits a mold cavity. The mold comprises a cavity chase (12) and at least one mold plate (13) that is movable relative to the cavity chase. The cavity chase is characterized in that it has front walls (16) that are more rigid than the inner wall (15) facing the mold cavity. According to another aspect of the invention, the mold plate comprises a reinforcing structure that is designed independently of a hollow chamber structure (23) of the mold plate, and vapor is conducted exclusively through the hollow chamber structure of the mold plate. Furthermore, fins (45) of the hollow chamber structure can be slanted so that condensed water forming in the hollow chamber structure flows away from the inner wall of the mold plate. According to a further aspect, a sealing element (33) surrounds the mold plate. Said sealing element is designed as an inflatable tube.

Description

mold

The present invention relates to a mold for the production of particle foam bodies.

In WO 2013/120479 A1 lightweight construction tools are described, which have two mold plates, which are surrounded by a mold frame. The mold plates are formed of a multilayered structure having a thin inner layer with which the mold cavity is confined. The thin inner layer significantly reduces the volume of material undergoing thermal cycling during shaping. The multilayer structure has, in addition to the inner layer, a supporting layer and a carrier layer. The support layer is formed from a plurality of support ribs arranged perpendicular to the inner layer, each having a plurality of recesses. Through the recess and the free spaces between the support ribs, a free fluid flow within the support layer is made possible, which is therefore also referred to as a molding line layer. The carrier layer consists of a stable plate. It is also stated in the claims of WO 2013/120479 A1 that the mold frame can be formed from such a multilayer structure.

This lightweight tool has proven to be fundamentally very good, because due to the multi-layer structure, the heat capacity to be heated in comparison to conventional tools is considerably reduced leu, whereby the clock cycles can be shortened and energy can be saved.

In internal experiments, the mold frame has been formed, similar to the mold plates of the tool, with a supporting layer which has recesses and cavities for the passage of steam. This layer structure also consists of a thin inner layer, a support layer and a carrier layer, which is a thick plate in comparison to the inner layer.

In this mold frame, there are significant problems caused by warping that occurs during welding. Due to the thin sheets, reworking is difficult because there is little material for Available. The inner layer or inner wall delimiting the mold cavity can have considerable distortions. This is extremely problematical since the mold plates are intended to be displaceable in the mold frame and the displaceability due to the distortions is not possible or the sealing between the displaceable mold plate and the mold frame can not be reliably ensured. In addition, a distortion on the inner walls of the mold frame means that the particle foam body produced hereby not have the desired shape.

Because of these problems with the multilayer mold frame, the lightweight tools have been formed with solid mold frames known from conventional mold tools. Only the mold plates are formed with the multilayer structure.

The individual walls of the mold frame are narrow, elongated body, which must be formed on the one hand with a very precise inner surface and on the other hand have to absorb considerable forces. On the other hand, in a mold known from WO 2013/120479 A1, which has a conventional mold frame, a great deal of heat is taken up by the mold frame and the advantages afforded by the multilayer mold plates are significantly impaired. DE 20 2004 003 679 U1 discloses a tool for producing a particle foam part, which consists of two mold halves. Each mold half is provided with a displaceably arranged wall, so that a shape can be variably adjusted.

DE 15 04 494 A relates to a device for producing particle foam body with an in turn consisting of two mold halves tool. In a schematic pictorial representation, the walls of the tool halves are formed with different thicknesses. The particles are heated by means of high-frequency radiation and welded together. Therefore, the tool is made of a dielectric which is permeable to the supplied high frequency energy.

DE 10 2008 016 883 A1 discloses a method for producing a molded body made of foamed plastic and a device for carrying it out. In this tool, the air contained in the mold cavity and in the steam chambers is to be removed by means of a steam purge. For this purpose, a steam supply and a vacuum device are provided.

The invention has for its object to provide a mold for producing particle foam bodies, which has a mold frame, which has a low heat capacity on the other hand can be reliably manufactured with the necessary precision and mechanically stable.

The object is achieved by a mold with the features of the independent patent claims. Advantageous embodiments are specified in the respective subclaims.

According to a first aspect of the invention, there is provided a mold for an apparatus for producing foamed particle foam, which defines a mold cavity and frames a mold and has at least one mold plate movable relative to the mold frame. The mold frame has a thin, the mold cavity bounding inner wall and two end walls, which extend from the edge of the inner wall radially outwardly, the end walls are stiffer and in particular thicker than the inner wall.

The stiff end walls give the frame a high stability. The thermal connection between the stiff or thick end walls and the mold cavity is low, so that the end walls hardly affect the heat capacity of the mold frame. Therefore, the end walls can be formed with any reasonable thickness, in itself.

The end walls contribute to the fact that the distortions that occur when welding the Innenwan- with the end walls are small, since the end walls can hardly distort and thus the location of a weld or a weld point, which for connecting one of the end walls with the inner wall are provided, define exactly.

The inner wall and the end walls can be connected to one another by means of welding, in particular by laser welding.

Preferably, the individual elements of the mold frame are connected to each other by means of laser welding, since laser welding produces a very thin weld, causing little distortion.

On their outer surfaces, the strong end walls can be milled plane-parallel. The end walls can also be rectified due to their thickness in retrospect.

Preferably, a honeycomb structure for stiffening the mold frame is arranged radially outside on the inner walls of the mold frame.

The mold may have two mold frames, in each of which a mold plate is displaceably arranged. The two mold frames are preferably arranged adjacent to each other with an end wall, wherein one of the end walls, which is arranged facing the other mold frame, may have a sealing element in order to seal the two mold frames mutually. The thin Innewandung may be thinner or thin-walled compared to the thicker end walls.

The thin inner wall has, in particular compared to the end walls, a low heat capacity and thereby withdraws the mold cavity during heating little heat.

The end walls have a much greater specific heat capacity than the inner wall. Since the end walls are coupled only with their end faces to the inner wall, the thermal connection to the mold cavity is low, so that the heat capacity of the end walls significantly affect neither the heating nor the cooling of the mold cavity.

The thin inner wall is formed with a thickness of at most 3 mm, preferably at most 2.5 mm and in particular at most 2 mm.

The rigid end walls have a thickness of at least 8 mm, preferably at least 9 mm and in particular at least 10 mm.

The mold frame is preferably formed from four frame parts, wherein each frame part has a strip-shaped, planar inner wall portion. The molding tool is preferably produced by first assembling the frame parts comprising in each case one of the inner wall sections, a honeycomb structure and in each case two Stirnwandungsabschnit ^¬ te, and then the frame parts are joined to the mold frame. The individual wall parts of the mold frame can be welded together. They can also be connected to each other by means of a plug connection, in which case corresponding sealing elements are to be provided.

The outward facing surfaces of the end walls can be milled flat. In a device for producing particle foam bodies are, for example, two form frame between two pressing surfaces arranged so that the mold frame, each with an end wall on one of the two pressing surfaces and with the other end wall on the other mold frame. Plan milled surfaces are of advantage here, since on the one hand an exact alignment of the mold frame with respect. The pressing surfaces and on the other hand, a transfer of pressure forces on Ensure the entire surface of the end walls. Furthermore, the two form of the frame adjacent end walls are flat against each other, so that they are well sealed with or without sealing element. Preferably, the wall parts are not formed with steam channels to supply steam to the mold cavity. As a result, no back cover of the wall side is necessary, which greatly simplifies the production of the wall parts of the mold wall.

Alternatively, steam channels may be integrated in the wall part, which are lined in particular with silicone hoses. The silicone hoses are preferably perforated on the side facing the mold cavity, so that the steam can escape into the mold cavity. The inner wall here has corresponding passage openings.

According to a further aspect of the present invention, there is provided a mold for a device for producing foamed particle foams, which delimits a mold cavity and has a mold frame and at least one mold plate movable with respect to the mold frame. The mold plate is made of a thin inner wall, an adjacent hollow chamber structure, in which steam channels are formed, wherein on the side facing away from the inner wall side of the hollow chamber structure, a stiffening structure is provided.

The stiffening structure is arranged outside the Holkam merstruktur. The stiffening structure has no Dam fkanäle on. The stiffening structure provides strength to the mold plate, but is not heated or cooled in the temperature cycles as much as the hollow chamber structure. As a result, the heat capacity, which must be heated or cooled in the temperature cycles, essentially determined only by the hollow chamber structure and the inner wall. The hollow chamber structure only has to transmit the pressure forces from the inner wall to the stiffening structure. The rigidity of the mold plate is essentially caused by the stiffening structure. Therefore, the hollow chamber structure may be formed thin-walled, which in turn keeps the heat capacity low.

The thin inner wall of the mold plate is formed with a thickness of at most 3 mm, preferably at most 2.5 mm and in particular at most 2 mm.

The inner wall has steam passage openings and the steam channels of the hollow chamber structure are provided with a connection for connecting a steam supply line.

The hollow chamber structure may have at least one connection for connecting a condensate discharge line. According to a further aspect of the invention, a mold for a device for producing particle foam bodies is provided. The mold limits a mold cavity and has a mold frame and at least one mold plate. The mold plate has a thin inner wall and an adjacent hollow chamber structure in which steam channels are formed. The hollow chamber structure has lamellae which extend away from the inner wall. Non-vertically extending fins are inclined downwardly away from the inner wall, so that condensate accumulating on the fins flows away from the inner wall of the mold plate. This ensures that no condensation collects adjacent to the inner wall of the mold plate, which would cool the inner wall locally and would affect the welding and sintering of foam particles in the mold cavity.

Preferably, the inclined blades of the hollow chamber structure are provided with through openings. In particular, at the regions of the lamellae which are arranged away from the inner wall, passage openings are arranged so that condensation water runs down through the passage opening. The condensed water can be removed with a suction device from the hollow chamber structure.

According to a further aspect of the present invention, a mold is provided for a device for producing particle foam bodies. The mold limits a mold cavity. The mold has a mold frame and a mold plate. The mold plate is movably arranged with respect to the mold frame. The mold plate is provided with a peripheral sealing member to seal the mold plate to the mold frame. The sealing element is designed as an inflatable tube. To move the mold plate, air or gas is discharged from the hose so that the mold plate is free to move relative to the mold frame. If the mold plate is correctly positioned, the tube is inflated with air or other gas, whereby the mold plate is sealed relative to the mold frame.

The hose preferably has rubber-elastic corner pieces at the corner regions of the mold plate which seal the corner regions of the mold plate with respect to the regions of the mold frame.

According to a further aspect of the present invention, a mold for the apparatus for producing particle foam bodies is provided. The mold limits a mold cavity. The molding tool is characterized by a hollow channel formed on the inner wall on the side facing away from the mold cavity. The hollow channel is lined with a plastic tube. In the region of the hollow channel extending through the inner wall and on the adjacent wall of the plastic tube vapor passage openings are formed. The hollow channel may be formed in a mold plate and / or in a mold frame. The plastic hose may be a silicone hose, but other plastics that are temperature resistant to conduct steam may be used.

In the above-explained aspects of the invention, the molding tool is formed from two mold frames and two movable mold plates, with one mold plate each being arranged in a mold frame. In the context of the invention, however, it is also possible that at least one mold plate is locally fixed in a mold frame.

The above-explained aspects of the invention may be carried out independently or in combination.

The invention will be explained in more detail by way of example with reference to the accompanying drawings. The drawings show in:

1 shows schematically an apparatus for producing particle foam bodies with a molding tool according to the invention,

Figure 2 shows a mold frame of a mold according to the invention in perspective

View,

FIG. 3 shows the mold frame from FIG. 2, wherein individual frame parts of the mold frame are represented sepa rat,

FIG. 4 shows the mold frame from FIG. 2 in a cross-sectional view,

Figure his mold plate in perspective view,

FIG. 6 shows the mold plate from FIG. 5 in an exploded view;

7 shows the mold plate from FIG. 5 in a side view,

8 shows a sectional view of the mold plate from FIG. 5 in an enlarged illustration with a thin inner wall, an adjacent hollow chamber structure and a reinforcing structure, FIG.

Figure 9a-d a hollow chamber structure for a mold plate with inclined blades in different views, and Figure 10a, b schematically a sealing element for sealing a mold plate against a mold frame.

As a rule, a device 1 for producing particle foam bodies has two mold halves, which are each represented by a molding tool 2 (FIG. 1). The molds 2 are arranged in a press device with two press frames 3, 4 such that the molds 2 are compressed by means of the press device in a closed position, so that the two molds 2 together define a mold cavity. In an open position (see Figure 1), the pressing frames 3, 4 are moved apart, so that the two molds 2 are spaced apart. In the open position, the molds 2 can be removed from a particle foam body produced therein. At least one of the pressing frame 4 is slidably mounted and by means of an actuating mechanism 5, the z. B. is designed as a hydraulic cylinder, actuated. The press frames 3, 4, the actuating mechanism 5, guide rods 6 for guiding the press frames 3, 4 are arranged in a rigid housing frame, which is formed of rigid steel beams.

At least one of the two molds 2 is provided with a filling tube 7, which is connected via a line 8 to a material reservoir 9. The line 8 is designed to supply foam particles from the material reservoir 9. The foam particles are conveyed to the filling tube 7 with the addition of compressed air. If the material from which the foam particles are formed, has high adhesion forces, such. B. expanded thermoplastic polyurethane (eTPU), then it may also be appropriate to supply in addition to the compressed air and steam to the line 8 to avoid sticking of the foam particles on the transport path from the material reservoir 9 to the filling tube 7.

The two molds 2 are each provided with at least one steam supply line 1 0 and at least one Kondensatabführleitung 1 1. The steam supply lines 10 are connected to a steam generator (not shown). The Kondensatabführleitungen 1 1 are connected to a vacuum pump (not shown).

The molding tools 2 are each formed from a mold frame 12 and a mold plate 13 movably arranged within the respective mold frame 12.

The mold frames 12 form a peripheral frame which defines a constant cross-sectional area with its inner surface. The mold plates 13 are plates which in plan view approximately have the shape bounded by the mold frame 12. On the circumference of the mold plates 13, a sealing element 33 is arranged in each case circumferentially, which is formed from an inflatable tube is (Figure 10a). The inflatable tube has at the corner areas on the outside approximately triangular solid rubber parts 34 which are vulcanised onto the tube (FIG. 10b). These triangular-shaped sealing parts 34 fill the inner corners of the mold frame 12 when the hose is inflated. The sealing element 33 is connected to a compressed air device for automatic inflation and deflation of the hose. To move the mold plate 13 within the mold frame 12, air is released from the seal tube 33, so that the mold plate 13 of the mold frame 12 is movable. If the mold plate 13 is in the desired position, then the sealing tube 33 is inflated so that it completely seals the intermediate region between the mold plate 13 and the mold 12.

For moving the mold plates 13 in the form of frame 12, a displacement device is provided in each case. The displacement devices have a plurality of push rods (not shown) which have a spindle drive in order to move the mold plate 13 coupled to the push rods. The mold plates 13 are provided with spring-loaded ejection bars 14. When moving back one half of the mold 2 by means of the actuating mechanism 5, the ejection bars 14 abut a baffle plate (not shown). As a result, the ejector rods 14 are pressed with bearing in the mold plate 13 ends through the mold plate 13 and eject a formed in the mold particle foam part.

An embodiment of such a mold frame is shown in Figures 2 to 4b. The mold frame has a thin inner wall 15, which is formed with a thickness of 1 mm to 3 mm. From the edges of the inner wall extending radially outward end walls 16. The end walls 16 are stiffer than the inner walls formed. In the present embodiment, the end walls 16 have a thickness of 10 to 12 mm. In the area between the end walls 16 and radially outside adjacent to the inner wall 15 is a honeycomb structure 17. In the present embodiment, the honeycomb structure 17 has rectangular honeycombs, which are formed from thin-walled, mutually orthogonal sheet metal strip.

The mold frame 12 has a rectangular shape in the front view, which is formed from four frame parts 18. Each frame part is formed from a strip-shaped, planar inner wall section, two Stirnwandungsabschnitten and a corresponding portion of the honeycomb structure (Figure 3).

The inner wall 15 has small holes 19, in which on the honeycomb structure 17 molded positioning pins are inserted. The honeycomb structure 17 is thus connected to the inner wall 15 with a plug connection. In the production of the mold frame 12, first, the individual frame parts 18 are assembled separately from the respective inner wall sections, the sections of the honeycomb structure and the Stirnwandungsabschnitten. The individual elements can be welded together. Preferably, they are connected to one another with individual spot welds.

The individual frame parts 18 are then directed separately. Only then are they put together and linked together. Preferably, they are joined together by welding. In particular, laser welding is suitable because a laser weld is very thin and causes little distortion.

Since the end walls 16 are made of rigid sheet metal strips, in particular sheet steel strips, they contribute substantially to the stability of the entire mold frame 12. In particular, they prevent that the frame parts 18 in the manufacture or that the entire mold frame 12 warps. At least they ensure that the delays are small, so that they can be directed to the mold frame 12 after assembly of the individual frame parts 18. Due to the thickness of the end walls 1 6, it is possible to plan to mill them and so align the surfaces of the end walls with respect to the inner surfaces of the inner walls exactly perpendicular to each other.

The mold frame 12 according to this embodiment has no steam channels for supplying steam into the mold cavity. This significantly simplifies the manufacture of the mold frame 12 and reduces the risk of distortion since no tight chambers are necessary to confine the steam channels.

Figure 4a shows an embodiment of the mold frame in cross-section, which has no filling tube. Figure 4b shows a similar cross-sectional view of another embodiment of the mold frame, which is provided with a filling tube 7, which can be connected via a line 8 to the material reservoir 9. The filling tube 7 opens through a corresponding opening 20 on the inner wall 15 at the inner region of the mold frame 12, with which a portion of the mold cavity is limited.

The thin-walled inner wall 15 defines a portion of the mold cavity. The inner wall has a low heat capacity in comparison with a thick wall, and as a result draws little heat from the mold during heating.

The end walls 16 have a much greater specific heat capacity than the inner wall 15. Since the end walls 16 are connected to the inner wall 15 only with their end faces. are coupled, the thermal connection to the mold cavity is low, so that the heat capacity of the end walls 16 affect neither the heating nor the cooling of the mold cavity significantly.

Due to the high rigidity of the end walls 16 of the mold frame 12 has a high rigidity, which reduces the risk of distortion. In addition, in minor distortions by face milling or surface grinding of the surfaces of the end walls 16, the outer surfaces of the end walls 16 and the inner surface of the inner wall 15 are aligned exactly orthogonal to each other. This allows for correcting the surfaces after final assembly of all elements of the mold frame 12.

The relatively thick end walls 1 6 also allow the introduction of a groove (not shown) for receiving a sealing element. It may be expedient to provide a circumferential sealing element 21 (FIG. 1) on at least one of the two end walls, which lie against each other in the closed state of the molding tools 2. The sealing element is preferably a silicone seal.

Another embodiment of a mold frame 12 (Figure 4c) is provided with a circumferential steam channel 35. Incidentally, this mold frame 12 is the same as the above-explained mold frame 12 is formed. The steam channel 35 is bounded by the inner wall 15, a sheet metal strip or a lamella 36 of the honeycomb structure and two additionally arranged sheet metal strips 37, 38. The metal strips 37, 38 are fixed with a few weld points on the inner wall 15 and on the blade 36 and with each other. The thus limited channel is not tight, so is located on the inner surfaces of the sheet metal strips 37, 38, the blade 36 of the inner wall 15, which limit the steam channel, a tubular silicone lining 39 which seals the steam channel 35. Self-aligned through-openings 40 are formed in the silicone lining 39 on the section lying in the inner wall 15 and on the inner wall 15, through which vapor can escape from the steam channel 35 into the mold cavity bounded by the mold frame 12. The silicone lining 39 makes it possible to connect the metal parts 15, 36, 37 and 39 in a non-tight manner, since due to the silicone lining 39 an inadvertent escape of the steam from the steam channel 35 is reliably avoided. A non-tight connection of the metal parts 15, 36, 37, 38 requires only a few, small welds that cause no distortion on the mold frame 12.

The mold plate 13 (Figure 5 to Figure 8) has a thin inner wall 22. The inner wall is formed with a thickness of 1 to 3 mm. On the outside of the inner wall 22, a hollow chamber structure 23 is formed. The hollow chamber structure 23, similar to the honeycomb structure 17 of the mold frame 12, is formed by means of thin-walled strip-shaped metal sheets. Mige honeycombs. However, the hollow-chamber structure 23 is closed substantially gas-tight with a front-side circumferential side wall 24 and a rear wall 25 arranged on the opposite side to the inner wall 22. In the present embodiment, the rear wall 25 extends in the peripheral region of the hollow chamber structure 23 a piece in the direction of the inner wall 22. Similarly, it is also possible that the side wall 24 over the entire height of the hollow chamber structure 23 or also a piece inward over the rear region extends. With substantially gas-tight is expressed that the hollow chamber structure is not formed absolutely tight, because the inner wall 22 of the mold plate 13 has steam passage openings, so that steam from the Hohlkam- merstruktur 23 can be introduced through the inner wall 22 in the mold cavity. Furthermore, the rear wall 25 has connections 26 for connecting steam supply lines 27 and condensate discharge lines 28.

Through holes 30 are provided in the metal strips 29 delimiting the honeycombs of the hollow chamber structure 23, so that a plurality of honeycombs are connected to steam channels along which the steam supplied via the steam supply lines 27 can be distributed in the hollow chamber structure 23. In the embodiment shown in Figure 6 free channels 40 are formed in the hollow chamber structure 23, which are free of metal strips of the hollow chamber structure 23. The free channels 40 extend over almost the entire longitudinal direction and almost the entire transverse direction of the mold plate 13. The Dampfzuführleitung 27 and the Kondensatabführleitung 28 open directly to the free channels 40. In the present embodiment, in each case a steam supply line 27 and a Kondensatabführleitung 28 to a common Connection piece 40 is connected, from which a short line section 42 leads to an opening 43 of the rear wall 25. The openings 43 are disposed adjacent to the free channels 40.

The hollow chamber structure 23 is essentially formed from thin-walled metal sheets, wherein the rear wall 25, the side wall 24, the inner wall 22 and the sheet metal strips 29 have a thickness of not more than 3 mm, preferably not more than 2.5 mm and in particular not more than 2 mm have.

The height of the hollow chamber structure 23, ie the distance between the inner wall 22 and the rear wall 25 is not more than 5 cm, preferably not more than 4 cm and in particular not more than 3 cm. The hollow-chamber structure 23 is thus a relatively thin honeycomb element which itself has no high rigidity. Therefore, a stiffening structure 31 is arranged on the side facing away from the inner wall 22 of the hollow chamber structure 23. The stiffening structure 31 is a framework of thick metal strips 32, which are arranged longitudinally and transversely to each other, so that they form a rectangular grid. The individual metal strips are perpendicular to the plane the inner wall 22 is arranged. The longitudinal and transverse metal strips are joined together by welding or soldering to form an integral stiffening structure 31. The vertical arrangement of the metal strips 32 with respect to the inner wall 22 and the rear wall 25 causes on the one hand a very high bending stiffness against bending of the hollow chamber structure 23 transversely to the plane of the inner wall 22 and on the other hand are the metal strips 32 only with their end faces on the rear wall 25, so the contact surface and thus the heat transfer from the rear wall 25 to the stiffening structure 31 is very low. In the present embodiment, the mold plate 1 3 extends over an area of z. B. 60 cm x 120 cm or 50 cm x 100 cm or 60 cm x 125 cm. With this size of the mold plate 13, the mass of the stiffening structure 31 is about 25 kg. The mass of the hollow chamber structure 23 including the rear wall 25 and the inner wall 22 is about 2 kg. Since only the mass of the hollow chamber structure 23 is heated or cooled in the heat cycles by the supplied steam, the impairment due to the heat capacity of the mold plate 13 is very low. On the other hand, a highly rigid stiffening structure 31 is provided, which is not heated and cooled substantially during the temperature cycles. The mold plate 13 thus has on the one hand a high strength and on the other hand only a small heat capacity, which comes into contact with the guided to ^¬ steam.

The hollow chamber structure 23 therefore preferably has a mass which is not more than 30%, in particular not more than 20% and preferably not more than 15% of the mass of the entire mold plate 13 including the stiffening structure. At the stiffening structure 31 still attachment points 44 are provided for securing the push rods. There are four attachment points 44 arranged in the corner regions of the stiffening structure 31.

FIGS. 9a to 9d show a further embodiment of the hollow-chamber structure 23 of the forming plate 13. The hollow-chamber structure 23 is formed like a honeycomb from horizontal metal strips or lamellae 45 and vertical metal strip or lamellae 46. The horizontal slats 45 are inclined relative to a plane perpendicular to the inner wall 22 by the angle α arranged (Figure 9d). The inclination is formed such that the horizontal slats 45 hang from the inner wall 22 of the mold plate 13 slightly downwards. In this way, water, which is formed by condensing steam in the hollow chamber structure 33, directed away from the inner wall 22 of the mold plate 13. At the edge of the horizontal lamellae 45 remote from the inner wall 22, openings 47 (FIG. 9b) are formed. Water, which forms by condensing water vapor in the hollow chamber structure 23, is guided away from the inner wall 22 of the mold plate 13 due to the inclination of the horizontal fins 45 and passes through the Outbreaks 47 and other openings 30 in the horizontal slats 45 in the lower region of the mold plate 1 3. At least here, a suction device is provided with a vacuum pump to remove the condensate from the mold plate 13. With this inclined arrangement of the horizontal slats 45 prevents condensation is not adjacent to the inner wall 22 of the mold plate 1 3 accumulates. This would mean that the inner wall 22 would be significantly cooled in the areas where the condensation is applied, and the welding or sintering of the foam in the mold cavity partikei is not reliably executable. Of course, 13 further suction devices can also be provided at other positions of the mold plate.

reference numeral

1 Apparatus for the production of particle 24 side wall 5 look m bodies 25 back wall

2 Molding tool 30 26 Connection

3 Press frame 27 Steam supply line

4 pressing frame 28 condensate discharge line

5 actuating mechanism 29 sheet metal strip

1 0 6 Guide rod 30 Through hole

7 filling tube 35 31 stiffening structure

8 line 32 sheet metal strip

9 Material reservoir 33. Sealing element

10 steam supply line 34. Eckdichtungsteil

1 5 1 1 Condensate discharge line 35. Steam channel

12 Form frame 40 36. Slat

13 Mold plate 37. Sheet metal strip

14 ejection bar 38. Sheet metal strip

15 inner wall 39. silicone lining 20 16 end wall 40. free channel

17 honeycomb structure 45 41. connector

18 frame part 42. line section

19 hole 43. opening

20 opening 44th attachment point

25 21 sealing element 45. horizontal lamella

22 inner wall 50 46. vertical lamella

23 Hollow-chamber structure 47. Outbreak

Claims

claims

1 . A molding tool for a device for the production of foamed particle bodies, which delimits a mold cavity and has a mold frame (12) and at least one mold plate (13) movable relative to the mold frame (12), wherein the mold frame (12) has a thin inner wall (1 5 ) and two end walls (16) which extend from the edge of the inner wall (15) radially outwardly, wherein the end walls (1 6) are stiffer than the inner wall (15).

2. Forming tool according to claim 1,

characterized,

a honeycomb structure (17) for stiffening the mold frame (12) is arranged radially on the outside of the inner walls (15) of the mold frame (12).

3. mold according to claim 1 or 2,

characterized,

the molding tool has two mold frames (12), in each of which a mold plate (13) is displaceably arranged.

4. mold according to claim 3,

characterized,

in that the two mold frames (12) are arranged abutting each other with one end wall (16), wherein one of the end walls (16), which is arranged facing the other mold frame (12), has a sealing element (21) in order to fix the two mold frames (12 ) seal each other.

5. Forming tool according to one of claims 1 to 4,

characterized, the inner walls (15) have a maximum thickness of 3 mm or a maximum of 2.5 mm or a maximum of 2 mm.

6. Forming tool according to one of claims 1 to 5,

characterized,

the end walls (16) have a thickness of at least 8 mm.

7. Mold tool according to one of claims 1 to 6.

characterized,

in that the mold frame (12) is formed from four frame parts (18), each frame part (18) having a strip-shaped, planar inner wall section.

8. mold according to claim 7,

characterized,

that the mold is formed by the frame parts (18) each ^¬ weils one of Innenwandungsabschnitte, a honeycomb structure and two Stirnwandungsabschnitte are first fully assembled, and then the frame parts (18) frame to the mold (12) are joined together.

9. mold according to one of claims 1 to 8,

characterized,

that the outwardly facing surfaces of the end walls (16) are milled plan.

10. Forming tool according to one of claims 1 to 9,

characterized,

that the inner wall (15) and the end wall (16) are connected to one another by means of welding, in particular by means of laser welding.

1 1. Mold for a device for producing particle foam bodies, in particular according to one of claims 1 to 10, wherein the molding tool delimiting a mold cavity and a mold frame (12) and at least one relative to the mold frame (12) movable mold plate (1 3) and the Mold plate (13) has a thin inner wall (22) and an adjacent hollow chamber structure (23) in which steam channels are formed, wherein on the side remote from the inner wall (22) of the Hohlkam- merstruktur (23) a stiffening structure (31) is provided ,

12. Forming tool for a device for producing particle foam bodies, in particular according to one of claims 1 to 1 1, wherein the molding tool has a mold cavity. and a mold frame (12) and at least one mold plate (13) and the mold plate (13) has a thin inner wall (22) and an adjacent hollow chamber structure (23), in which steam channels are formed, wherein the hollow chamber structure (23) lamellae ( 45, 46) which extend away from the inner wall and non-vertically extending fins (45) are inclined away from the inner wall (22) downwards, so that on the fins (45) accumulating condensate away from the inner wall (45). 22) is flowing.

13. Forming tool according to claim 12,

characterized,

in that the inclined blades (45) of the hollow chamber structure (23) have passage openings (30, 47) which are arranged away from the inner wall (22) such that condensation water runs down through the passage openings (30, 47).

14. Forming tool according to claim 12 or 13,

characterized,

a suction device is provided for extracting condensed water from the hollow chamber structure (23).

15. Forming tool according to one of claims 1 1 to 14,

characterized,

the inner wall (22) has steam passage openings.

16. Forming tool according to one of claims 1 1 to 15,

characterized,

the hollow-chamber structure (23) is provided at least with a connection for connecting a steam supply line (27).

17. Forming tool for a device for producing particle foam bodies, in particular according to one of claims 1 to 16, wherein the molding tool delimiting a mold cavity and a mold frame (12) and at least one with respect to the mold frame (12) movable mold plate (1 3) .

characterized,

that the mold plate (13) comprises a circumferential sealing element (33) for sealing the mold plate (13) relative to the mold frame (12), and

the sealing element (33) is an inflatable tube.

18. Forming tool according to claim 17,

characterized,

that the hose is connected to a compressed air device for automatically inflating and deflating the hose.

19. Forming tool according to claim 17 or 18,

characterized,

the hose is provided with a plurality of elastomeric corner pieces (34) to seal the mold plate (12) at corner portions of the mold frame (12).

20. Forming tool for a device for producing particle foam bodies, in particular according to one of claims 1 to 19, wherein the molding tool defines a mold ^cavity and the molding tool has a thin inner wall bounding the mold cavity

characterized,

a hollow channel (35) is formed on the inner wall (15, 22) on the side facing away from the mold cavity, and the hollow channel (35) is lined with a plastic tube (39), wherein in the region of the hollow channels (35) through the inner wall ( 15, 22) and an adjacent wall of the plastic hose (39) extending Dampfdurchlassöffnun- gene (40) are formed.