DE10059443A1 - Method for producing a strand from a quantity of small plant components with binding agents comprises compacting the material in an extruding machine followed by hardening, and extracting gases and vapors from the material released - Google Patents

Abstract

Method for producing a strand from a quantity of small plant components with binding agents comprises compacting the material in an extruding machine followed by hardening in a hardening channel under the action of heat. The gases and vapors from the material released from the strand are extracted from extraction chambers (28-32) surrounding the heat and/or steam injection devices. An Independent claim is also included for a device for carrying out the method. Preferred Features: The condensate formed in the extraction chambers and the central extraction tube and/or guide tube are fed to a separate extraction/pumping-out device.

Description

The invention is concerned with a method and a device for curing of strands, in particular strands of small plant parts. It will be below Called heating duct and is located after an extrusion or extrusion tube press. These presses are described, for example, in the patents DE 29 32 406; DE 44 44; EP 0 339 497; PCT / EP / 99/01988 treated. The strand to be hardened is in the presses shaped and pushed into the heating duct. In this he is on the setting temperature of the Bring binder and leaves the heating channel after completion of the setting process.

The curing takes place either solely through the hot walls of the heating duct, as in DE 25 35 989 or by a combination of hot plates and steam indexed into the strand as described in DE 199 08 315.4-44 and PCT / EP / 99/01988.

The latter document proposes the excess steam or gases through the Dornloch or by means of a degassing device downstream of the reactor in the Heating circuit. Compared to the devices mentioned above, PCT / EP / 99/01988 actually recover some of the thermal energy.

Nevertheless, a considerable part of the energy goes through the gaps in this device as well lost in the heating duct segments designed similarly to DE 25 35 989. DE 25 35 989 the energy loss is correspondingly greater due to the lack of any extraction.

In addition to these losses, the devices mentioned have another significant disadvantage. The escaping gases are not pure water vapor and air, but a mixture of water vapor with components of the binder, such as. B. formaldehyde and NH ³ . The permissible maximum workplace concentration is exceeded many times over.

Devices according to DE 25 35 989 were therefore provided with extraction hoods. It worked but not to reduce the concentration of harmful gases to a tolerable level. The Ab suction hoods require a large number of suction lines. On the tangle of these pipes and Hoods are constantly depositing wood dust, which can result in deflagrations or fires. It is therefore necessary to extract all of the room air and the extraction system to continue operating fend to clean. To separate the harmful gases from the exhaust air is a considerable effort with corresponding costs necessary. In the press room there is a constant renewal of Indoor air required so that the legally defined max. Concentration for the workplace Harmful gases are not exceeded. This creates extreme conditions for the operator in winter high heating costs. The heating duct is also cooled.

Heating channels according to DE 25 35 989 are heated with heat transfer oil. Here are the Extrusion with the heating channels in a row next to each other. The heating channels are in divided several heating circuits in the pressing direction. Each heating circuit supplies a variety of Presses, each with a different flow resistance. The war Meträgeröl takes the path of least resistance, which causes great differences in Oil throughput and subsequently in the heat input in the individual strands and strands adjust cuts. Calculations have shown that the heating time of the strands  is very different. On average, it is about 11 sec / mm strand thickness, so a lot fold, the value of chipboard presses.

Despite the fact that some of the systems described have been in operation for 25 years, it is not ge solutions to eliminate the disadvantages.

The object of the invention is therefore to prevent harmful gases and heat from escaping to prevent energy from the immediate vicinity of the heating ducts and the thermal energy to be fed from the gases to a recovery plant. Another object of the invention is a gas duct integrated into the device, which has a myriad of pipes and pipes avoids suction hoods, as well as largely integrated into the device even supply of the heat transfer medium in the heating plates around the heating time to minimize.

The object of the invention has been achieved with the features of the claims.

The invention deals in this chapter with the management of the heat transfer medium. In principle, apart from the hot water and heat transfer oil described, the use of electric heaters is possible and conceivable within the scope of the entire heating duct. The invention considers this type of heating to be particularly advantageous, particularly in the case of smaller strand cross sections. It teaches the installation of heating elements or cartridges in the heating plates in a known manner. It leads the electrical connections, shielded from the gases escaping from the suction chamber. The protection against the gases can be done by suitable lines. As a particularly advantageous embodiment, the invention teaches ever lead the cables out of the heating plates in relatively stable pipes such as hydraulic pipes with handelsübli screw connections. The heating plates are provided with holes in which the heating rods or cartridges are located. The ends of the holes are provided with threads in which screw connections, e.g. B. adjustable angle screwing exercises. The screw connections carry the protective tube protruding outwards, the ends of which are sealed vapor-tight with electrical screw connections. The connection cables of the heater protrude through the screw connections and the pipes. The invention proposes the use of the stable hydraulic pipes or other metal pipes, which is unusual in itself, in comparison with the commercially available electrical cables for the following reason:
The strand is heated by heating plates or angles. Since the dimension of the strand can change slightly, the position of the heating plates relative to the outer wall of the suction chamber also changes by up to a few millimeters. The hydraulic tubes are sufficiently stable to form a counter surface to the sealing element of the suction chamber. This version ensures a twist-free cable entry. This pays off the higher effort involved in routing cables in a hydraulic pipe. The holes are sealed gas and pressure tight by the screw connections.

With larger cross sections, such as for pallet blocks, is used as a heat transfer medium to preferably use hot water or heat transfer oil. The heating channel for such a The extrusion system has a length that prohibits production in one piece. The Length dimension can be up to 70 if the strand is only heated by means of the heating plates Meters. If the rod gray hardening is carried out according to PCT / EP / 99/01988, the length is determined after the setting time of the binder. For presses with a feed rate of approx. 7 m / min and standard particle board glue for waterproof V100 gluing is the measure about 22 meters. The heating duct is therefore cut in segments of about 2 to 4 m in length which are connected with each other. In the event of faults or for emptying, these must Segments can be opened.  

In an embodiment according to the invention, each segment forms a sub-heating circuit with egg Inlet and outlet for the heating medium. The holes for the medium of each heater plate or each wall element are preferably parallel through from the medium flowed. The wall elements themselves are preferably closed in series one behind the other. This arrangement enables relatively small holes for the medium and thus ratio moderately thin wall elements. This can limit the necessary flow rate be kept there, in order to achieve a good energy output, a turbu in the holes flow should prevail.

These holes cannot be made to any length. For example, it is hardly possible to drill holes with a diameter of 5 mm and a length of 2 meters. For cases in where such a small cross-section of the bore is necessary or most economical, the invention teaches to make the holes in a size that is not technically difficult caused the cross-section by inserting a rod on the ideal cross to reduce average size. According to the invention, these rods are not simple round rods but trained in a turbulence-promoting form. Have proven to be a simple solution bare rebars or the insertion of compression springs in the holes. With ver Different strand cross sections can have a different number of holes per wall element or plate may be required. The invention teaches here either the cross section to keep the sum of the individual elements in a heating aisle segment approximately the same size or by inserting the described rods or springs for at least approximately to ensure the same flow resistance in the individual holes.

The invention is based on the knowledge that the heat transfer medium is always the most Finds the easiest possible path from the inflow to the drain hole. By the past structure of each heating aisle segment is achieved that the flow resistance each is at least roughly the same size.

The invention further teaches each extruder from its own circuit with the To supply heat transfer medium. Laying these lines for the heat transfer medium dium under the floor has the disadvantage that the floor can hardly be sealed, especially This is because the pipes expand considerably when they heat up. Laying the pipes in The height of the heating aisle requires space, such on the ceiling creates a tangle of cables where the small parts dust is deposited.

The invention advantageously places the pipes between the feet of the heating duct your own tour. As a result, the device does not require any additional space and Raw people can freely expand and contract in their leadership. That on bring the insulation and its cladding is in this advantageous embodiment in simp feasible way. It is intended to cover the openings of the ver to be provided with sealing washers so that no small parts get into the insulation or get to the pipes.

The invention relocates the inlet and the return pipe preferably at a short distance each other in the pressing direction between the heating channel feet. With spur lines the one individual heating duct segments with the heat transfer medium supplied and disposed of. So that every Segment the required, d. H. the desired one. but unequal amount of heat receives medium, that is, flows through it, the invention forms the feed pipe largest on the first heating duct segment and smallest on the last. Conversely here the drain pipe is designed to. The heating pipes shrink or enlarge with each Heating duct segment around the cross-section of the parallel flowed bores.

When heating up and cooling down, the pipes and the heating duct expand unevenly fast and long. The invention therefore connects the inlet and outlet pipes with the heater channel segments via curved metal spiral hoses.  

The following chapter deals with the object of the invention, which results from the heating duct to collect and discharge any gases and / or vapors. a heat recovery feed.

In the protection specification PCT / EP / 99/01988 it is proposed to exit through the pinhole aspirating steam or gas. Teaching continues after the second reactor attach a suction device. However, this does not allow gas to escape from the others Prevents segments of the heating duct. The invention therefore provides for the entire heating duct including the preheating and reactors.

Here, the invention takes into account that the entire heating channel during the heating up zens and cooling expands and contracts. The heating elements continue to move by up to a few millimeters during operation. To empty and in case of malfunctions the heating duct segments must be opened. This is conveniently done individually mitelst power generator, z. B. Hydraulic cylinder.

The invention manufactures the heating duct segments to form hinged suction hoods as follows:
As previously known, the heating duct walls are formed from a rigid and a movable heating angle or heating shells in the case of round profiles. The heating angles of each segment are connected with folding brackets.

The suction chambers between the folding brackets of each segment and between the Folding brackets of two successive segments are made up of at least two half-chambers det. The lower chambers are largely sealed with the rigid parts of the folding bracket prevented. The upper suction chambers are light with the moving parts of the folding bracket releasably connected. The connections of the chamber parts to each other and to the folding bracket dividing does not need to be pressure-tight but only to the extent that it is sealed, that the suction does not suck in too much external air from the outside.

The heating duct walls are insulated from the suction chamber. The isolation of the suction chamber can be done in two strengths.

The invention proposes a particularly good insulation when the escaping gases in largely gaseous state to be suctioned off.

A correspondingly less powerful one if the water vapor and the glue component oils should condense in the suction chambers and the condensate should be pumped out. In both versions, the invention places stub lines to one under the suction chamber common drainage pipe.

The invention advantageously uses this as a suction pipe for the gases and vapors central support tube under the heating segments.

When heating up, the heating plates, the central support tube and the tubes for the heat expand carrier medium unevenly or in different times. The connection from the support tube to the suction chambers and from the oil pipes to the heating plates is therefore via ge curved hoses.

A device according to the invention is constructed as follows:
The heating brackets are fastened in the folding brackets and form the heating segments. These are connected to each other with their rigid heating plates or bowls and guided in the central guide and suction tube so that they can move longitudinally. The castors of the double feet protrude into this. The oil pipes are guided longitudinally between the double feet. The hydraulic tubes for the tension cylinders, which push the heating plates against the strand, hardly heat up. They can therefore be rigidly attached to the double feet. The condensate return pipe heats up and is attached to the double feet so that it can move lengthways.

The double feet are rigidly connected to the floor, for example using dowels. That is exhaust pipe to which the central guide and suction pipe is connected, serves as a fixed point for the pipe bundle of the heating medium.

The heating aisle segments are by means of a displacement sensor, for example a hydraulic cylinder which, on the central guide and suction pipe, can be moved longitudinally. When dismantling the Preheating or the reactors, the heating channel segments can be moved as far as who that easy disassembly can take place.

The suction chambers are from the end of the press - that is, their front cross-members - to the end of the Heating channel or up to a separation point on the saw.

The amount of gases emerging from the heating duct segments is unequal in the pressing direction. At the beginning of the heating duct it is relatively small and increases towards the end. Comes a re actuator acc. PCT / EP / 99/01988 for use, the gas outlet around this reactor is greatest In this area, increased suction due to, for example, larger dimensions Connections are provided

The invention is described below without restricting the general inventive concept based on exemplary embodiments with reference to the drawings described, except for the rest of the disclosure of all in the text explained details of the invention is expressly pointed out. Show it:

Fig. 1 shows a longitudinal section through a heating duct.

Fig. 2 shows a partial section through the line system for the heat transfer medium.

Fig. 3 shows a flow system of the heat transfer medium.

Fig. 4 shows a detail in the circle "X" of FIG. 1,.

Fig. 5 shows a cross section through a heating duct.

Fig. 1 shows a longitudinal section, not lying in one plane, through a heating duct. In the exemplary embodiment, an extrusion press according to DE 29 32 406 or 29 32 405 1 with a wedge-shaped widening press nozzle 2 and a rigid preheating duct 3 is connected by a connecting plate 4 to the heating duct 5 . Of the heating duct 5 , only the first two heating duct segments 6 and 7 are shown. The rigid heating angle 8 are on the Füh approximately 9 and 10 frames. The movable heating brackets 11 are connected in a known manner to the folding brackets 12 and 13 in such a way that they can move in the X, Y and Z axes of the heating duct 5 by a few mm. In order to achieve good heat input and / or to control the compression of the strand, the force transmitters, for example hydraulic cylinders 14 , press the movable heating angle 8 against the strand. The heating is carried out in the exemplary embodiment by hot water or heat transfer oil, which is guided from the supply pipe 15 through the hoses 16 into the heating angle 11 and from this into the heating angle 8 .

The snap frames 9 and 10 are guided with rollers 17 on the central guide and suction tube 18 longitudinally. The central guide and suction tube 18 is connected to the feet 19 by the rollers 20 longitudinally connected.

The central guide and suction pipe 18 is connected to the suction pipe 21 by means of a connec tion connector 22 . The feed pipe 15 and the return pipe 23 for the hot water or heat transfer oil are fastened to the suction pipe 21 with the fastening element 24 and are mounted for longitudinal movement in the base frames 19 .

In the exemplary embodiment, the suction pipe 21 forms the fixed bearing for the parts of the heating duct which are longitudinally movable.

The debris of the heating duct heated up by the hot water or the heat transfer oil expands, depending on the temperature and heating duct length, by up to about 150 mm (at 70 m heating duct length) in different times. The central guide and suction pipe 18 also expands due to the gas sucked out in it. Due to the above-described position tion of the central guide and suction pipe 18 in the base frames 19 , the longitudinally movable guide of the tube package 25 in the base frames 19 and the longitudinally movable position of the heating duct segments 6 and 7 in the central guide and suction tube 18 , the expansion can be independent of one another respectively.

For easy disassembly of parts of the heating duct 5 , the rigid preheating duct 3 or parts of the extrusion press 1 ; 2 serves the displacement sensor 26 , for example a hydraulic cylinder. After removing the connecting plate 4 , the heating duct segments 6 and 7 can be shifted in length.

An at least two-part first suction chamber 28 is formed from the traverse end wall 27 to the first guide frame 9 and the first folding bracket 12 , which prevents the gases / vapors emerging from the strand from escaping into the environment. The following suction chambers 29 , 30 , 31 and 32 and the others up to the end of the entire heating channel 5 are formed in a similar or similar manner. In the exemplary embodiment, each suction chamber consists of a lower half-chamber 33 , which are fastened to the tabs 34 of the associated guide frame 35 in such a way that the change in length is absorbed during heating / cooling. The lower half-chambers generally do not have to be removed to empty the heating duct. The upper half-chambers 36 between two heating duct segments are either released or removed on the heating duct segment that is not to be opened, in order to open the movable folding brackets 37 . The upper half-chambers 38 between the folding brackets 12 and 13 of a heating duct segment 6 generally do not have to be released for opening. The gases / vapors emerging from the strand are passed into the central guide and suction pipe 18 , as described in more detail in FIG. 5. The resultant from the gases / vapors in the Absaukammern condensate is passed into the condensate pipe 39 to the pipes / hoses 38th

The uncondensed gases / vapors are sucked off by means of a suction device, not shown, from the central guide and suction pipe 18 , via the connecting piece 22 through the suction pipe 21 .

In the case of a plurality of extrusion presses, the invention advantageously connects the suction pipes 21 of all the presses to one another. The blown gases / vapors are still so high that they can be used, for example, to heat the combustion air in the boilers for the required hot water or heat transfer oil or for the steam boiler when the heating duct is designed with reactors in accordance with PCT / EP / 9901988. The return pipe 23 is referred to in Fig. 2, in which it is not shown.

In PCT / EP / 9901988, as in DE 199 08 315.0-44, the heat input for curing takes place of the strand essentially by hot gas or steam. These reactors or steams Carrying devices are in the same way as described above by suction chambers encapsulated against the escape of gases / vapors into the environment.

Fig. 2 shows a partial section through the supply and return line system 40 of the hot water or heat transfer oil. Each heating duct segment forms its own heating circuit 41 , 42 , 43 , 44 , 45 with an inlet 46 and an outlet 47 . The first run of the supply line 48 gives to the first heating circuit, the design of which corresponds to the amount of heat transfer medium. In accordance with the quantity dispensed, the second run 49 is reduced in cross-section compared to the first run 48 . By the same cross section, the second run 50 of the return line increases compared to the first run 51 . The enlargement / reduction of the subsequent debris with the inlets and outlets to the heating circuits 43 , 44 , 45 takes place analogously .

As described in FIG. 1, the suction tube of FIG. 1 forms the fixed point of the heating duct, from which the parts of the heating duct expand away from the press during heating. The invention provides for all supply and discharge lines and the gas / vapor extraction to be combined as far as possible. It is therefore provided that the end of the return pipe 52 for the heat transfer medium is connected to that with the return pipe 23 from FIG. 1. This enables a relatively simple insulation and storage of the tube bundle for the heat transfer medium and the system can be guided on rollers between the base frames. This arrangement is at the same time particularly space-saving and easy to clean from the wood dust and chips deposited everywhere in a wood material company.

Fig. 3 shows a flow system of the heat transfer medium (hot water or Wärmeträ geröl) in a heating channel. Outlined are the feed pipe 53 and the return pipe 54 , which che as described, reduce or enlarge according to the outflow of the heat transfer medium. Each individual heating circuit 55 and 56 consists of a rigid heating angle 57 and a movable heating angle 58 . The rigid heating bracket 57 is made from the heating plates 59 and 60 , the movable heating bracket 58 from the heating plates 61 and 62 . In the embodiment sketch, the total cross section of the 4 heating bores of the heating plate 59 corresponds to the total cross section of the three heating bores 64 of the heating plate 60 . The same applies to the movable heating angle 58 . The heat transfer medium thus moves through the heating plates of the heating circuit 55 at the same or approximately the same speed. The heat transfer medium flows through the heating plates of the heating circuit 55 in series, with the most turbulent flow possible in order to achieve effective heat dissipation. The heating circuit 56 is identical to the heating circuit 55 in the embodiment sketch. A large number of heating circuits are arranged one behind the other according to the requirements. With this embodiment, the invention achieves a uniform flow through the heating holes and thus a best possible heat input into the strand. The flow resistance is approximately the same in each heating circuit. If it is intended to partially or predominantly cure the strand with steam or hot gases, the devices for introducing gas / steam, as presented in PCT / EP / 9901988 or DE 199 08 315.0-44, are arranged in front of or between the heating circuits or segments.

Fig. 4 shows a detail in the circle "X" of Fig. 1. The movable heating angle 65 is pressed against the strand with an adjustable force. The pressure is applied by force transducers not shown here. It is therefore mounted in a known manner in such a way that it can change its position relative to the folding bracket 66 in the directions of the arrow cross 67 slightly, that is to say by a few mm. In order to be able to remove the cover 68 which prevents gas / steam from escaping into the vicinity of the heating duct after the release of the closure 69 , the invention carries the heat transfer medium through a pipe system 70 into the heating bore 71 . The bore 72 is enlarged compared to the tube 73 so that the movable heating angle 65 can perform the aforementioned movements. A gas / steam escape through the bore 72 is prevented by the sealing washer 74 and the cover washer 75 . The heating plate 76 is provided with insulation to the suction space 77 and protected with a cover plate 78 .

A turbulent flow of the heat transfer medium is required in order to achieve optimal heat dissipation in the heating plates and thus in the strand. In order to keep the flow rate as low as possible, a heating duct has a large number of heating holes, the smallest possible cross section of the heating holes 71 is aimed for. If a correspondingly small hole of the required length cannot be produced, or this would require an excessive outlay, a rod with a reduced cross-section, for example rebar steel which promotes turbulence, or a compression spring 79 is inserted into the heating bore 71 . The heating hole is sealed in the exemplary embodiment with a commercially available screw plug 80 . The cross-section-reducing elements can also be used in any way to influence the foot resistance.

Fig. 5 shows a cross section through a heating duct. The rigid heating bracket 81 and the lower half 82 of the suction hood 83 are attached to the guide frame 84 . The movable heating bracket 85 is fastened to the folding bracket 86 so as to be movable by a few mm. The upper half 87 is also attached to it. The two suction halves 82 and 87 are sealed off from one another with the seals 88 and 89 and form the suction chamber 89 . The gas or steam emerging from the strand into the suction chamber 89 are fed via the line 90 , preferably a metallic corrugated hose, into the central guide and suction tube 91 and are sucked out of the latter. The condensate that forms in the suction chamber 89 is fed into the condensate tube 93 via the condensate hose 92 . The condensate formed in the central guide and suction pipe 91 also passes through the hose 94 into the condensate pipe 93 , from which it is sucked off or pumped out. After loosening the connection 95 , the folding bracket 86 with the movable Heizwin angle 85 through the travel sensor 96 , z. B. a hydraulic cylinder to be opened around the axis 97 for emptying the heating duct. In the double feet 98 with the rollers 99 running on both sides, the central guide and suction tube 91 is guided in a longitudinally movable manner and can expand in accordance with its heating. The guide frames 84 are in turn guided with the two-sided rollers 100 in a longitudinally movable manner in the central guide and suction tube and can likewise expand in accordance with their heating. The same applies to the tube bundle 101 of the heat transfer medium tubes. The feed pipe 102 , the return pipe 103 expanding in stages and the return pipe 104 returning in the direction of the suction pipe, which virtually forms a U-pipe with the return pipe 104 , are fixed at a distance from one another by support plates 105 and with the rollers 106 on both sides in the Profiles 107 mounted longitudinally. The tube bundle 101 is ver seen with insulation 108 and protected by the panel 109 .

The invention is not restricted to the exemplary embodiments described above. For example, it is also possible to use tension springs instead of the hydraulic cylinders or to arrange the components that expand when heated differently. The invention also teaches, instead of the suction hoods, the sealing by temperature use permanent hoses with a spiral insert to open the heating duct segments te can be pushed together.

Claims (18)

1. A process for producing a strand from a mixture of small parts with a binding agent, in which the mixture is compressed in the extrusion press and brought into a curing channel and hardened by heat input, characterized in that the gases and vapors of the small parts and Binder mixture from, the heating and / or steam injection devices enclosing suction chambers are sucked off. 2. The method according to claim 1, characterized in that the suction chambers and the central suction pipe and / or conduit forming a condensate separate suction or a pumping device is supplied. 3. The method according to claim 1 and / or 2, characterized in that the suction gases and / or vapors and / or the condensate before or after cleaning a Heat recovery system are supplied.   4. The method according to at least one of claims 1 to 3, characterized in that that the cleaned or unpurified gases / vapors are heated combustion air the boiler (s) for hot water generation or heating oil heating and / or the Steam generation for strand heating can be supplied. 5. The method according to claim 1, characterized in that the supply everyone individual extrusion press with heat transfer medium is carried out by its own circulating device. 6. Device for performing the method according to the preceding claims, since characterized in that the suction chambers, with the heating duct segments closed a closed space between the end of the heating duct-side crossbar the strand press at least until the end of the heating duct in the pressing direction or up to the inlet opening of the crosscut saw following the heating duct. 7. The device according to claim 6, characterized in that from the strand escaping gases and / or vapors from the suction chambers with flexible connecting lines be brought into a guide and suction tube and extracted from it. 8. Device according to claims 6 and 7, characterized in that the segments te of the heating duct are mounted on the guide and suction pipe so as to be longitudinally movable. 9. Device according to claims 6 to 8, characterized in that the Füh tion and suction pipe are mounted on the feet of the device to move longitudinally. 10. The device according to claim 9, characterized in that the feed pipe for the The heating medium decreases in cross section after each heating duct segment by approximately the amount nert in the heating medium is released into the associated heating channel segment. 11. The device according to claim 9, characterized in that the discharge pipe for the heating medium in cross section, in the same length in the heating channel, by about the same loading increases the size of the feed tube. 12. The apparatus according to claim 11, characterized in that the discharge pipe from End with its largest cross-section, following an arc parallel to almost the beginning of the feed pipe protrudes. 13. Device according to claims 10 to 12, characterized in that the zu guide tube and the returned return tube in the foot frames of the heating duct are stored movably and there is the rigid attachment from which the tube bundle extends can stretch, located at the end of the heating duct where the heating duct with the press connected is. 14. The device according to at least one of claims 1 to 13, characterized in net that that in the suction chambers and / or in the guide and return pipe Condensate gets into the condensate pipe and is sucked or pumped out of it can. 15. The apparatus according to claim 14, characterized in that the heating channel segments by a travel sensor, e.g. B. a hydraulic cylinder a in the longitudinal direction to the guide and suction pipe can be moved.   16. The apparatus according to claim 14, characterized in that the guide and Suction pipe is guided into a fixed suction pipe, which forms the fixed point of from which the guide and suction tube can expand in length. 17. The apparatus according to claim 16, characterized in that with several strands press systems the suction pipes are connected to a common pipe. 18. The device according to at least one of claims 1 to 17, characterized in net that the suction chamber consists of at least two partial hoods between the folding iron and the associated guide frame are formed, which are mutually sealed elements are sealed.