DE102009060554A1 - Method and device for producing molded parts from plastic, in particular from a fiber composite material - Google Patents

Abstract

It is a process for the production of molded parts made of plastic, in particular from a fiber composite material, in a continuously operating press, with several molding tools, each with at least one molding space, the molding tools being filled with a molding compound, the molding tools filled with the molding compound in The working direction of the press is guided one after the other through the press nip of the press and applied with pressing pressure and possibly heat so that the molding compound hardens and the molding tools are removed from the press on the outlet side and opened for demolding the molded part.

Description

The invention relates to a method and an apparatus for producing molded parts made of plastic, in particular of a fiber composite material.

Plastic means z. As thermosetting plastics, d. H. especially resins, e.g. As epoxy resins, polyester resins or polyurethane resins which are initially liquid, viscous or powdery and harden under the action of a hardener and / or by pressure and / or heat. Basically, the invention also includes the production of molded parts made of thermoplastic materials, the z. B. heated (as a melt) are introduced into the mold and then cure by cooling. Plastic in the context of the invention particularly preferably means a fiber-reinforced plastic and consequently a fiber composite material in which fibers are embedded or embedded in a matrix of plastic. The fibers may preferably be glass fibers and / or carbon fibers or carbon fibers, but also ceramic fibers, metal fibers and / or natural fibers and corresponding combinations. The fibers may be loose, but preferably in the form of semi-finished products, for. B. as fiber mats or the like. Moldings means z. B. molded parts for the automotive industry, for. As body parts, or moldings for aerospace engineering, z. B. fuselage, wing parts or the like for aircraft construction. Furthermore, it may be components for mechanical engineering, z. B. components for power plant construction, plant construction and in particular wind turbines or the like.

The invention preferably relates to a process for the production of molded parts from fiber composite materials by means of transfer molding, which is also referred to as RTM process (Resin Transfer Molding). In this method, which is basically known, first the fibers (eg a semifinished fiber product) are placed in a mold, which as a rule consists of upper tool and lower tool. After closing the tool, the molding compound (eg, a two-component molding compound of a resin and a hardener) is injected into the mold cavity so that the molding compound encloses the fibers as a matrix and cures to form the molding. Before and / or during the injection of the molding compound, the mold can be subjected to negative pressure or vacuum.

The production of molded parts from fiber composites by means of transfer molding (Resin Transfer Molding) is z. B. in the DE 10 2007 046 734 A1 . DE 10 2007 023 229 A1 and the DE 10 2008 026 161 A1 described.

Since the molding material usually not only by the hardener or z. As heat, but in particular cures under pressure, it is necessary to clamp the tool halves against each other. For this purpose, it is possible to mount the mold or the mold halves in a press, so that the molding compound is injected after inserting the fibers and after closing in the closed mold. Such presses operate in clock mode. After pressing or curing, it is then necessary to first open the press, remove the molded part and usually clean the tools before the next cycle can then begin. The economic production of relatively large components, eg. As body parts for motor vehicles or for the aerospace industry is difficult.

Incidentally, continuous presses are known, which are used in particular for the production of wood-based panels, but also for the production of plastic sheets or plastic mats. In such continuous presses, z. B. may be formed as a double belt presses, the molding material, for. As a fiber mat or a plastic mass, passed directly through the press nip of the press, so that the outlet side from the press plates or plate strands or mats or mat strands expire.

The production of molded plastic parts in a continuous press is in the US 4,824,354 described. There, the upper tools in the press upper part in circulation and the lower tools in the press base are circulated, so that upper tool and lower tool are merged automatically in the inlet region of the press. In the inlet area then plate-shaped semi-finished products are inserted into the molds, which are formed in the course of the passage through the press.

The invention has for its object to provide a method which allows the economic production of high-quality molded plastic parts, in particular large-sized molded parts made of fiber composite material.

To achieve this object, the invention teaches a method for producing molded parts from plastic, in particular from a fiber composite material, in a continuously operating press, with a plurality of mold tools each having at least one mold space,
wherein the molds are filled with a molding compound,
wherein the molds filled with the molding compound are guided in succession through the press nip of the press in the working direction of the press and thereby acted upon with pressing pressure, wherein the molding material hardens and
wherein the molds are removed from the outlet side of the press and opened to remove the molding.

In the case of thermosetting plastics, the molding compound is preferably applied not only with pressure but also with heat. In the case of thermoplastics, the molding material is not only pressurized, but also z. B. cooled.

In principle, it is possible to introduce the molding compound into the still open or already closed molds before the molds are introduced into the press or into its press nip. However, the molding compound is particularly preferably introduced into the molding space of the molding tools, for. B. injected after the molds were closed and introduced into the press nip of the press. Preferably, the invention relates to the production of molded parts from a fiber composite material, wherein in the molds before closing and insertion into the press nip fibers or a semi-finished fiber are introduced and wherein then introduced after closing and preferably after insertion into the press nip, the molding material in the mold space , z. B. is injected.

The invention is based on the recognition that molded parts made of plastic and in particular a fiber composite material, can be produced particularly economically in a continuously operating press. Continuous presses are basically known, for. B. in the embodiment as a double belt presses. The invention has now recognized that through the press nip of such a press not only directly a molding compound, for. B. can pass a fiber mat or a plastic mass for the production of plates or plate strands, but also that a plurality of press tools behind each other (and possibly also side by side) and consequently together or simultaneously pass through the press nip, so that in an economical manner in a continuous operation high-quality components for z. B. the vehicle industry or the aerospace industry or mechanical engineering can be produced, in particular by way of injection molding. The molds can be removed on the outlet side completely from the press, so that the cured moldings can be removed easily and economically. The molds can then be cleaned easily, since they are not firmly mounted in a press, but are completely removed and thus easy to handle. Subsequently, the molds can be returned to the press inlet and then refill in a next cycle and pass through the press. The cleaning of the press tools can, for. B. during the return of the molds. Since in the course of the return usually a distance must be covered, which corresponds at least to the press length, this distance and the time required for the return transport can be used to clean the tools. The system can then work very economically.

According to a further proposal, it is provided that the mold cavity is subjected to vacuum or vacuum after closing the molds and before or during the introduction of the molding compound.

In the manner described, moldings of conventional materials and in particular conventional fiber composites can be produced. They are preferably thermoset molded parts which are produced on the basis of a resin or based on a plurality of resins and usually a hardener or a plurality of hardeners. However, the molding compound usually cures not only because of the hardener, but more preferably under application of pressure and also heat. This means that the molds are heated in the context of the invention before entering the press and / or during the passage of the press. So it is within the scope of the invention that the molds are heated directly during the passage through the press nip, via heating elements, which are integrated into the molds. These may be, for example, resistance heating elements or also heating channels through which a heating medium flows. Alternatively or additionally, it is possible, the molds during the passage through the press nip indirectly, z. B. heated by heated press plates and consequently heating plates of the continuous press. The invention is based on the recognition that the known continuously operating presses, z. B. double belt presses for the production of wood-based panels or the like are usually equipped with heated press plates. It is possible to indirectly heat the press tools passing through the press nip via these heatable press plates. This indirect heating can also be combined with direct heating.

If thermoplastics are processed, the tools can also directly or indirectly, for. B. with cooled pressure plates to be cooled.

To allow a "real" continuous operation of such a continuous press ensure, it is within the scope of the invention that the molds are filled during the transport of the molds through the press with the molding compound and / or subjected to negative pressure. It is then not necessary to always stop and start the press, but it is possible to inject the molding material into the "running" molds, preferably in the inlet region or in the front region of the continuously operating press. This can be achieved, for example, by providing movable spray heads and optionally vacuum devices in the press longitudinal direction, which can be moved over a specific section along the press longitudinal direction synchronously with the forming tools and consequently with the press speed. However, continuous operation in the context of the invention also means a "quasi-continuous" operation, in which the molding compound is introduced into the molding space in the stationary state of the molding tools.

The invention also relates to a press plant for the production of molded parts made of plastic and in particular molded parts made of fiber composite material according to a method of the type described. Such a press line has a continuously operating press with press top and press base and with a press nip and a plurality of molds, each consisting of at least Upper tool and lower tool are composed, between which a mold space is formed. Furthermore, the press installation has at least one filling device for filling the molding space with a molding compound. In principle, it is possible to work with continuously operating presses of different designs. As a rule, press cylinders or similar force elements are provided in the upper press part and / or lower press part.

Preference is given to using a continuously operating press which has at least one upper press plate, preferably heatable press plate, in the press upper part and at least one lower press plate, particularly preferably heatable press plate, wherein the molds are guided by roller bearings and / or slidingly supported by the press nip formed between the press plates become. The upper press plate and / or the lower press plate can be loaded with a plurality of pressing cylinders. In a roller bearing preferably rolling rods or a roll bar carpet or a roller carpet or a similar Wälzkörperteppich be used. This technology is known in continuous presses for the production of wood-based panels or plastic panels. The rolling rods can preferably be guided on (outer) chains in circulation. But you also know other Wälzkörperaggregate or Wälzkörperteppiche that can also be used, eg. B. Wälzkörperteppiche from a variety of small roles, which are arranged one behind the other and side by side and are connected by a plurality of chain links. These can also be used. The upper Rollstangenteppich or Wälzkörperteppich then runs below the upper press plate and the lower Rollstangenteppich or Wälzkörperteppich then runs above the lower press plate in the working direction through the press, so that the press nip between upper Wälzkörperaggregaten and lower Wälzkörperaggregaten is formed. It is within the scope of the invention that the molds are guided directly between the upper Wälzkörperteppich and lower Wälzkörperteppich by the continuous press. Optionally, the continuously operating press in the upper press part and in the lower press part each endless circulating press belts, z. B. steel strips, which are guided over pulleys on the one hand in the press upper part and on the other hand in the press base. The press belts can be slidably mounted or preferably supported on the respective press plates by rolling bearings, the forming tools then being transported between the press belts and consequently also by the press belts through the press nip formed between the press belts. Again, on the known technologies, eg. B. from the wood-based panel industry, are used.

If steel strips or pressing belts are dispensed with, which can transport the forming tools through the press, it is possible to transport the forming tools via the rolling element assemblies. For this purpose, driven chains can be connected to the Wälzkörperaggregate. In principle, there is the possibility that the molds are also guided by their own drives or pulled through the press. Preferably, however, offers the described solution with press belts.

In principle, it is possible to pass the forming tools through the press in "Closed Die Mode". In this mode, the molds are completely closed, ie upper tool and lower tool are directly adjacent to each other. The press nip is fixed by the height of the (incompressible) molds. The press can then be relatively easy to operate, as can be done on the molding tools no significant increase in the pressing pressure within the mold space on the increase of the pressing pressure, as on the fully closed molds traction occurs. Preferably, however, the molds are passed through the press in the "Open Die Mode". In this mode, the molds are not directly adjacent to each other, but the molds are interposed with the introduced into the mold cavity molding compound (after filling the molding compound) by a (small) gap spaced from each other. In this mode, it is now possible by means of regulation or control of press nip and / or pressing pressure to have a specific influence on the molding process, since, for example, by increasing the pressing pressure, influence can also be exerted on the pressing pressure in the mold space. It is then envisaged to set the gap between the molds to a predetermined level, taking into account a predetermined tolerance. In this context, it is expedient if the pressing pressure and / or press nip of the continuous press are adjusted variably and in a defined manner over the press length and / or over the width of the press. Consequently, a pressure profile variable over the press length and / or press width and / or a travel profile variable over the press length and / or press width can be set. The press can consequently be operated under pressure control with a monitored path window. Alternatively, the press can also be operated in a regulated manner with a monitored pressure window. The press thus has preferably at least in the press longitudinal direction a plurality of pressing cylinders, which z. B. against the upper press plate and / or work against the lower press plate. Preferably, however, the press also has a plurality of press cylinders in the press transverse direction, for. B. at least three press cylinders, preferably five press cylinders or more. In this way, the press profile can also be adjusted variably over the width of the press. So z. B. inclinations of the press dies are compensated. Taking into account the fact that a variety of molds are passed through the press, for example, it is also possible to manufacture different moldings simultaneously in one and the same press, as z. B. in a part of the press molding tools for the production of a specific molding and another part of the press molding tools for the production of another molding can be located. By adjusting the press characteristic, it is even possible to selectively exert different influences on the production process.

In addition, there is the possibility of also passing molds of different sizes and in particular of different heights through the press, in that for example spacers are then placed on (or underlayed) the "lower" molds.

A particularly economical production of molded parts is made possible because a large number of molds are passed "simultaneously" through the press nip and consequently a large number of molds are simultaneously in the press. Thus, the invention proposes that preferably at least five, more preferably at least eight molding tools are guided in succession through the press together in the working direction. The molding tools preferably have a width of at least 1 m, more preferably at least 2 m and / or preferably a length of at least 2 m, particularly preferably at least 3 m. In principle, several molds (smaller width) can be guided side by side through the press. Furthermore, the invention proposes that the molding tools in the press with a specific pressing force of z. B. 100 to 500 N / cm ² , preferably 250 to 400 N / cm ^{2 are} applied.

Assuming, for example, that nine dies are consecutively (jointly) guided through the press and that a die is about 2.5 m wide and 4 m long, the result is a press length of about 36 m.

The cycle time of a mold through the press should be about 60 to 300 sec., Z. B. 100 to 200 sec. be. The speed of the molds in the press nip, which z. B. is determined by the speed of the press belts, can 100 mm / sec. up to 500 mm / sec., z. B. 100 mm / sec. up to 300 mm / sec. be. The molds are heated with the proviso that heats the molding material in the mold cavity to the material type dependent, required temperature. It is within the scope of the invention that the molding material -. B. in thermosetting materials - in the press during curing at least temporarily has a temperature of 100 ° C to 200 ° C. - In the case of thermoplastics much lower temperatures, possibly even cooling, can be provided.

The filling device, which is the subject of the press installation according to the invention, preferably has at least one spray head, with which the fibers are injected in the mold space of the closed molds. Furthermore, the filling device preferably has at least one vacuum source with which the mold space of the closed molds can be evacuated before and / or during the injection of the molding compound. The vacuum source may be part of the filling device, but it may also be formed separately. The filling device or its spray head and / or the vacuum source can - in order to enable the described genuine continuous operation - be at least partially movable with the guided through the press nip molding tools. The molding tools can be provided in the manner described with integrated heating elements, wherein a heating device can be connected to the molds, which can optionally be moved with the molds. This offers itself in particular in a direct heating of the molds. Then there is the possibility to connect an external heater "temporarily" and to move along the press. However, the heater may also be integrated into or connected to the tools. The electrical contacting can then take place via flexible supply lines or via contact rails running along the press (for example with sliding contacts). An inductive heating is possible, in which case corresponding induction devices are arranged along the press longitudinal direction.

In the production of fiber composites, moreover, not only the molding compound must be introduced into the mold cavity, but it is also necessary to insert the fibers or semi-finished fiber products into the mold. This is usually done before closing the mold and consequently before entering the press. For this purpose, an (automated) loading device can be provided. Loading means in the context of the invention, the feeding of the molds with the fibers or semi-finished fiber. The insertion of the fibers or semi-finished fiber can be done automatically or manually.

Incidentally, it is within the scope of the invention when fiber composites are produced which have different plastic components. So z. As well as coated moldings are made, in which on the one hand a curable resin and on the other hand, a lacquer or a lacquer layer are introduced into the mold. In this respect, multi-layer fiber composites can be produced.

In addition, the press system according to the invention can be equipped with a transport device for the return transport of the removed from the press and emptied molding tools for press inlet. The transport device preferably extends adjacent to the continuous press. The invention is based on the recognition that the molds are of course to be made available for a further molding process after removal. The return transport can be optimized with an automated transport device. In the area of the press outlet, a removal device is preferably provided, with which the finished molded parts can be removed from the mold and the molds can preferably also be opened. Since a loading device is usually provided in the area of the press inlet for loading the opened forming tools with a semi-finished fiber product or the like, the (return) transport device is preferably arranged between the removal device and the loading device. Particularly preferably, the (return) transport device is associated with a cleaning device. The invention is based on the recognition that it is particularly advantageous if the molds are cleaned during the return transport. The return transport route and the return transport time can therefore be exploited particularly economically.

Incidentally, it may be expedient to equip the molding tools with sensors which measure various parameters. Then it is useful if a data exchange between the molds and the press system or to a corresponding control of the press system is provided. For this purpose, suitable communication means may be arranged on the molds. So there is not only the possibility to monitor the temperature, but there is z. For example, it is also possible to continuously record the gap measured at the dies and, if necessary, incorporate them into the control process or control process. However, the data exchange can not only be wireless, but also wired via suitable tow cables or the like. This can be useful, for example, if anyway cable or the like are carried along to heat the molds.

In the following the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. Show it

1 simplified and schematically a press line for the production of plastic fiber composite materials in a side view (partial) and

2 a press plant after 1 with a greatly simplified top view.

The press line has a continuous press 1 with press upper part 2 and press base 3 and a press nip 4 on. In the press upper part is an upper press plate 5 intended. In the press base is a lower press plate 6 intended. The press frame consists essentially of lower straps 7 and upper straps 8th and between the carriers held press frame 9 together. In the exemplary embodiment is an upper piston press, in which the upper press plate 5 with pressing cylinders 10 is applied, which is against the press frame 9 support. The lower press plate 6 lies with the interposition of a pressure distribution plate 11 on the press frame 9 on. Between the press plate 6 and pressure distribution distribution plate 11 thermal insulation can be arranged.

The subject of the press plant are also a variety of molds 12 , each made up of upper tool 13 and lower tool 14 put together. The molds 12 are roller bearings in the embodiment through the press nip 4 passed. These are both in the press upper part 2 as well as in the lower press part 3 roll bars 15 or Rollstangenteppiche led to chains not shown in circulation. The roll bars 15 each supported on the press plates 5 . 6 from. Optionally there is the possibility that both in the press upper part 2 as well as in the press base 3 endless circulating steel press belts 16 are guided. These steel bands 16 and the associated deflection drums 17 are only indicated in the figure.

With the press system shown only as an example can now be molded parts made of plastic and in particular fiber composite materials continuously and consequently produced particularly economically. Before entering the press 1 be first in the open molds 12 Fibers or semi-finished fiber products, for. B. fiber mats inserted. This can be a suitable feeder 18 be provided for the introduction of the fiber mats. In 1 this charging device is not shown. The left there in the press incoming mold 12 was already charged with a semi-finished fiber and closed. After loading, the molds 12 consequently closed and in the press nip 4 the continuous press 1 introduced. Once the molds 12 in the press nip 4 have run in and are thus subjected to pressing pressure, the molding material, for. As a resin with a curing agent, ie a two-component molding material, in the mold space of the molds 12 injected. This is a merely indicated filling device 19 provided, which has a spray head. It is expedient if the mold space is acted upon by closing the molds and before or during the introduction of the molding material with negative pressure. This is also a merely indicated vacuum source 20 provided, which also to the molds 12 in the inlet area of the press 1 is connectable.

It can be seen that successively a variety of molds 12 fed with a fiber mat and then in the press 1 shrink and be filled with the molding compound, so that a variety of molds 12 together and in the direction of the press in a row the press nip 4 run through. With the continuous press 1 Consequently, a plurality of moldings are continuously produced "at the same time". In the press nip 4 hardens the molding compound (within the molds 12 ), in particular because of the introduced hardener, but also by means of pressing pressure and heat. The tempering of the molding compound by heating the molds 12 can be direct and / or indirect. In the figure, it is indicated that the molds 12 with integrated heating elements 21 are provided, which may be formed as a resistance heating elements or as heating channels for a heating medium. Details are not shown in the figure. In any case, in the inlet region of the press only indicated heating device 22 be connected to the molds 12 to heat directly. In addition, there is the possibility of the molds indirectly via the heated press plates 5 . 6 , with the interposition of the rolling rods 15 and the steel press belts 16 to heat, ie also the rolling rods 15 and the steel press belts 16 are heated up accordingly.

After the molds on the outlet side of the press 1 leave, can the molds 12 opened and the finished moldings are removed, z. B. with an in 1 Not shown removal device 23 ,

In order to realize a "real" continuous operation, it is within the scope of the invention that the filling device 19 is equipped with a movable spray head in the press longitudinal direction, so that the molding material during transport into the closed molds can be injected. Likewise, the vacuum source 20 be movable. If also a heater 22 is provided, it can also be moved, possibly even over the entire press length. Especially with the filling device 19 and the vacuum source 20 However, it is usually sufficient if they are moved over a relatively short distance in the inlet area of the press with the forming tools (back and forth).

The illustrated press 1 prefers to work in "Open The Mode", ie upper tool 13 and lower tool 14 are not directly against each other when passing through the press or during pressing, but are separated by a (small) gap, with the interposition of the molding compound arranged in the molding compound, ie after filling with the molding compound. This mode has the advantage that actually by adjusting the pressing profile in the continuous press 1 also the pressing process can be influenced within the mold space. Therefore, it is provided in the embodiment that a plurality of pressing cylinders 10 are arranged one behind the other, so that over the press length a variable pressing profile can be adjusted. Also in the press transverse direction are a plurality of pressing cylinders 10 arranged side by side. This is not shown.

Incidentally, displacement transducers are preferably provided which monitor the press nip (between upper press plate and lower press plate) or the gap between upper tool and lower tool. The transducers are not shown. If the displacement sensors are arranged on the molds, a direct measurement of the gap between the upper tool and lower tool takes place. However, the measurement can also be done indirectly by the displacement transducer associated with the press plates. Finally, the displacement transducers can also be arranged on the cylinders, so that it is then likewise (indirectly) possible to close the gap between the upper tool and the lower tool.

In 2 is indicated that for the return transport of the molds 12 a transport device 24 is provided. This transport device 24 conveys the molds - after removing the moldings in the sampling device 23 - back to the press inlet or to the feeder 18 , in turn, then a semi-finished fiber in the mold 12 is inserted. The removal device 23 can be equipped with an opening device, not shown, to open the expiring from the press molds 12 to realize. In 2 is implied that the molds 12 be returned in the open state. In this case, an embodiment is shown, in the upper tool 13 and lower tool 14 each together or side by side on one side of the press (next to the press) are returned. However, there is also the possibility of upper tools 13 and lower tools 14 each separately, for. B. due in each case on a press side. Anyway, it is expedient, the return transport laterally next to the press 1 provided. Particularly preferably, cleaning of the molds takes place during the return transport 12 , For this purpose, automated cleaning devices may be provided, however, in 2 are not shown.

The press shown in the figure can, for. B. be interpreted as follows:
It can z. As molds with a width of 2.5 m and a length of 4 m are used. It is envisaged that nine molds are arranged at the same time in the press. This results in a press length of about 36 m. The pressing force per die can be about 3200 t, so that a specific pressing force of 320 N / cm ² results. The total press force is then 28,800 t. Assuming 29 press frames, this results in about 1000 t per frame, with a frame distance of about 1 m is realized. It is then useful over the width z. B. to provide five cylinders on each press frame, each generating 200 t pressing force. The pressing time can z. B. 140 sec. be so that then at a press length of 36 m, the press speed about 260 mm / sec. is. The cylinders are quasi static cylinders. The pressure profile can be adjusted with high precision in the longitudinal and transverse direction.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007046734 A1 [0004]
• DE 102007023229 A1 [0004]
• DE 102008026161 A1 [0004]
• US 4824354 [0007]

Claims (25)

Method for producing molded parts from plastic, in particular from a fiber composite material, in a continuously operating press, with a plurality of shaping tools each having at least one molding space, wherein the molds are filled with a molding compound, wherein the molds filled with the molding compound in the working direction of the press are guided in succession together through the press nip of the press and thereby acted upon by pressing pressure, wherein the molding material hardens and wherein the molds are removed from the outlet side of the press and opened to remove the molding. The method of claim 1, wherein the molding material is introduced into the mold space of the molds, for. B. is injected after the molds have been closed and introduced into the press nip of the press. The method of claim 1 or 2, for the production of molded parts from a fiber composite material, wherein in the molds prior to closing and insertion into the press nip fibers or a semi-finished fiber is introduced and wherein then after closing and preferably after insertion into the press nip the molding compound in introduced the mold space, z. B. is injected. Method according to one of claims 1 to 3, wherein the mold space after closing the molds and before or during the introduction of the molding material is subjected to negative pressure. Method according to one of claims 1 to 4, wherein the molds are heated during the passage through the press nip directly via integrated in the molds heating elements. Method according to one of claims 1 to 5, wherein the molds during the passage through the press nip indirectly, z. B. heated via heated press plates of the continuous press. Method according to one of claims 1 to 6, wherein at least five, preferably at least eight molding tools are guided together in succession through the press. Method according to one of claims 1 to 7, wherein the molding tools or the molding material in the press with a specific pressing force of 100 to 550 N / cm ² , preferably 250 to 400 N / cm ^{2 are} applied. Method according to one of claims 1 to 8, wherein the cycle time of a molding tool by the press 60 to 300 sec., Z. B. 100 to 200 sec. is and / or wherein the speed of the molds in the press nip 100 mm / sec. up to 500 mm / sec., z. B. 100 mm / sec. up to 300 mm / sec. is. Method according to one of claims 1 to 9, wherein the molding material is heated in the press and during curing at least temporarily a temperature of z. B. 100 ° C to 200 ° C. Method according to one of claims 1 to 10, wherein the molds for continuous operation of the press during transport of the mold filled with the molding material and / or subjected to negative pressure. Method according to one of claims 1 to 10, wherein the molding tools for a quasi-continuous operation of the press are applied in the stationary state with the molding material and / or with negative pressure. Method according to one of claims 1 to 12, wherein the molds removed from the press on the discharge side after the removal of the molded parts in the open or closed state to the press inlet or to a arranged in the press inlet feeding station are returned, the molds preferably cleaned during the return become. Method according to one of claims 1 to 13, wherein the molding tools each composed of upper tool and lower tool are spaced apart by a gap during the pressing with the interposition of the molding material arranged in the mold space, wherein this gap is optionally monitored during the pressing. Press plant for the production of molded parts from plastic, in particular fiber composite material, according to a method according to one of claims 1 to 14, comprising - a continuous press ( 1 ) with press upper part ( 2 ) and press base ( 3 ) with a press nip ( 4 ), - several molds ( 12 ), each consisting of at least upper tool ( 13 ) and lower tool ( 14 ) are formed between which a mold space is formed and - a filling device ( 19 ) for filling the mold space with a molding compound. Plant according to claim 15, wherein the continuous press ( 1 ) in the press upper part ( 2 ) At least one upper, z. B. heated press plate ( 5 ) and in the press base ( 3 ) a lower, z. B. heated press plate ( 6 ), wherein the Molding tools ( 12 ) roller-mounted and / or slide-mounted by the between the press plates ( 5 . 6 ) formed press nip ( 4 ). Plant according to claim 15 or 16, wherein in the press upper part ( 2 ) and in the press base ( 3 ) each endless circulating press belts ( 16 ), z. B. steel strips, are guided, which roller bearings and / or slide-mounted on the press plates ( 5 . 6 ) are supported, wherein the molding tools ( 12 ) from the press belts ( 16 ) by the between the press belts ( 16 ) formed press nip ( 4 ) be transported. Plant according to claim 16 or 17, wherein between upper press plate ( 5 ) and lower press plate ( 6 ) and / or in the area of the pressing cylinders ( 10 ) and / or on the molds ( 12 ) Transducer for determining the press nip ( 4 ) and / or for determining the gap between upper tools ( 13 ) and lower tool ( 14 ) are arranged. Plant according to one of claims 15 to 18, wherein the molding tools ( 12 ) have a width of at least 1 m, preferably at least 2 m, and / or a length of at least 2 m, preferably at least 3 m. Plant according to one of Claims 15 to 19, the filling device ( 19 ) has at least one spray head, with which the molding material in the mold space of the closed molds ( 12 ) is injected. Plant according to one of Claims 15 to 20, the filling device ( 19 ) at least one negative pressure source ( 20 ) or that a separate vacuum source is provided, with which the mold space of the closed molds ( 12 ) are evacuated before and / or during the injection of the molding material. Plant according to one of claims 15 to 21, wherein the filling device ( 19 ) or its spray head and / or vacuum source ( 20 ), at least in regions in the press longitudinal direction or along the working direction with the through the press nip ( 4 ) guided molds ( 12 ) is movable. Plant according to one of claims 15 to 22, wherein the molding tools ( 12 ) with integrated heating elements ( 21 ) are provided, wherein the molding tools ( 12 ) a heating device ( 22 ), which, if necessary, with the molds ( 12 ) is movable. Plant according to one of Claims 15 to 23, with a transport device ( 24 ) for the return transport from the press ( 1 ) and possibly by means of a removal device ( 23 ) emptied molding tools ( 12 ) to the press inlet or to a front of the press inlet arranged feed device ( 18 ), wherein the press tools ( 12 ) are preferably cleaned during the return transport, z. B. with a cleaning device. Installation according to one of claims 15 to 24, wherein in the press longitudinal direction and / or press transverse direction in each case a plurality of pressing cylinders ( 10 ) are distributed one behind the other or side by side, with which in the press longitudinal direction and / or in the press transverse direction, a variable pressing profile, in terms of pressure and / or press nip, is adjustable.

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