Abstract:
Straight plastic profiles from a plastics material and a continuous reinforcement are predominantly produced continuously in a strand, usually by the pultrusion method. As the plastic profile is pulled through a mold, only straight plastic profiles are formed in known pultrusion methods. In the production of plastic profiles using semi-finished products or complex fibrous constructions, congestion of the fibrous constructions or of the semi-finished products, and thus solidification of the material, may arise when entering the mold, such that the process has to be stopped. A method and a device for the simple production of individually molded plastic profiles is provided in that the mold is formed from at least two mold parts that in relation to the cross section of the plastic profile are split and are moved in a temporally offset manner counter to a production direction of the plastic profile along a portion of the plastic profile.

Description:
STATEMENT OF RELATED APPLICATIONS 
       [0001]    The application is the US National Phase of International Application No. PCT/EP2015/001317 having an International Filing Date of 30 Jun. 2015, now International Publication No. WO 2016/023605 A8 having an International Publication Date of 18 Feb. 2016, which claims priority on German Patent Application No. 10 2014 011 943.2 having a filing date of 14 Aug. 2014. 
     
    
     BACKGROUND OF THE INVENTION 
     Technical Field 
       [0002]    The invention relates to a method for the production of a plastic profile having a continuous reinforcement from strands, woven fabrics, and/or the like, wherein a mold is moved counter to a production direction of the plastic profile along a portion of said plastic profile, and the plastic profile herein is retained by at least one holding means that, when viewed in the production direction, is positioned ahead of the mold, and to a device for the production of a plastic profile having a continuous reinforcement from strands, woven fabrics, and/or the like, having a mold which is movable counter to a production direction of the plastic profile along a portion of the plastic profile, and at least one holding means that, when viewed in the production direction, is positioned ahead of the mold, for at least temporarily retaining the plastic profile. 
         [0003]    Straight plastic profiles from a plastics material and from a continuous reinforcement from fibers, woven fabrics and/or warp-/weft-knitted fabrics that are embedded in the plastics material, are predominantly produced continuously in a strand. This is usually carried out by the pultrusion method. To this end, the at least one strand is guided through a mold. In the mold the strand is provided with a liquid plastics material which subsequently cures in the mold. The cured plastic profile that exits the mold is pulled through the mold by a take-off installation that is disposed ahead of the mold in the production direction, and herein is simultaneously transported away. On account of the plastic profile being pulled through the mold by the take-off installation, only straight plastic profiles may be formed in the case of the known methods of the type described, in particular in the case of known pultrusion methods. 
         [0004]    In the case of the production of plastic profiles using semi-finished products or complex fibrous constructions, respectively, particular problems arise when the latter are heavily compressed when entering the mold. Congestion of the fibrous constructions or of the semi-finished textile products, respectively, and thus solidification of the material, may arise when entering the mold, such that the process is stopped or has to be stopped, respectively. This risk exists in particular when the fibers run into the mold entry at an acute angle, and the materials that are used for the production of the semi-finished product typically have to be pressed flat so as to achieve a meaningful fibrous content in the plastic profile. In order for this congested situation to be alleviated, the semi-finished product may be tensioned such that congestion is practically impossible in the entry. However, this measure alone, without the material already being in the shape of the plastic profile, may lead to significant distortions of the material and to mechanical stresses in the material. 
       BRIEF SUMMARY OF THE INVENTION 
       [0005]    The invention is based on the object of achieving a method and a device for the simple production of individually molded plastic profiles. 
         [0006]    A method for achieving this object is a method for the production of a preferably curved plastic profile having a continuous reinforcement from strands, woven fabrics, and/or the like, wherein a mold is moved counter to a production direction of the plastic profile along a portion of said plastic profile, and the plastic profile herein is retained by at least one holding means that, when viewed in the production direction, is positioned ahead of the mold, characterized in that the mold is formed from at least two mold parts that in relation to the cross section of the plastic profile are split and that are moved in a temporally offset manner counter to a production direction of the plastic profile along a portion of said plastic profile. Accordingly, it is provided that the mold is formed from at least two mold parts that in relation to the cross section of the plastic profile are split and that are moved in a temporally offset manner counter to a production direction of the plastic profile along a portion of said plastic profile. Since the mold or the mold parts, respectively, is/are adapted to the two- or three-dimensional course of the plastic profile anyway, the former may follow the individual course of the plastic profile. By way of the temporally offset onward movement, counter to the production direction, of the mold parts relative to the plastic profile, a portion of the completed and cured plastic profile at least partially exits from one of the mold parts without the plastic profile having to be pulled through the mold and, on account thereof, being subjected to tensile stress that would not permit the forming of curved profiles, as is the case in the prior art. The formation of congestion of the reinforcement is precluded by the offset movement of the mold parts in that the agglomeration of the material is alternatingly pushed along in front of the moving mold part. 
         [0007]    It is furthermore provided that the at least two mold parts are moved in a periodically alternating manner, in particular at least at times simultaneously or separately, respectively, counter to the production direction of the plastic profile along a portion of said plastic profile. Accordingly, initially a first mold part and thereafter a further, or second mold part, respectively, moves counter to the production direction along the plastic profile. However, it is also provided that the second mold part already moves on the plastic profile while the first mold part is also still moving. Two mold parts may thus move across the mold part in a manner similar to the skis of a cross-country skier. 
         [0008]    The periodicity of the movement of the mold parts is substantially established by the type and by the shape of the mold parts and by the material or by the plastic profile to be produced, respectively. The production speed of the plastic profile may be accelerated by increasing the cycle rate. 
         [0009]    In the case of one preferred design embodiment of the method it is provided that the at least two mold parts are moved discontinuously or in steps, respectively, preferably in a mutually parallel manner, so as to be at least partially opposite or protruding along a longitudinal axis of the plastic profile, wherein a movement of the mold parts relative to the plastic profile in particular takes place only during a reverse movement of the mold parts counter to the production direction. It is provided that the mold parts, depending on the requirements of the plastic profile to be molded, may move in an arbitrary manner, preferably in a mutually independent manner, counter to the production direction along the plastic profile. 
         [0010]    It is provided that the plastic profile, during the movement of the at least two mold parts on the plastic profile that is stationary relative to the latter, is retained, preferably by at least one holding means. In order for the plastic profile being formed not to move during the movement of the mold parts, that portion of the plastic profile that in the production direction has already exited the mold parts is fixed or retained, respectively, by a holding means, in particular by a gripper. A reproducible production of the plastic profiles is made possible by this retention. 
         [0011]    According to the method it is provided that initially a first mold part, preferably a convex mold part relative to the cross section of the mold, is moved counter to the production direction along the stationary plastic profile, and subsequently a second and in particular shorter mold part, preferably a concave mold part relative to the cross section of the mold, is moved in a manner likewise to that of the first mold part, wherein in the case of each movement of a mold part counter to the production direction at least part of a newly produced portion of the plastic profile is demolded or released, respectively, from the moving mold part. 
         [0012]    In the case of the production of a curved plastic profile relative to the longitudinal axis of the mold or of the plastic profile, respectively, it is provided that the shorter mold part is moved along an external radius of the curved profile, or is moved along within an internal radius of the curved profile, respectively. It is moreover conceivable for the concave mold part to be moved first and for the convex mold part to be moved thereafter. The method according to the invention thus explicitly also provides the production of curved plastic profiles such as, for example, arches, springs, or the like, or else of closed shapes such as, for example, rings, preferably rims or bicycle rims, respectively. The method is therefore not limited to straight profiles; rather, profiles of arbitrary shapes, in particular curved profiles may be produced. 
         [0013]    According to one further design embodiment of the method it is provided that the at least one holding means in phases during which the mold parts are stationary is brought out of contact with the plastic profile, and the at least two mold parts to move conjointly with the plastic profile in the production direction toward the at least one stationary holding means, and the at least one holding means, in order to reach an initial position, is subsequently brought back into contact with the plastic profile. Subsequent thereto, the mold parts, in order to form the profile, are moved in the opposite production direction again. 
         [0014]    The invention preferably furthermore provides that the at least one holding means in phases during which the mold parts are stationary is brought out of contact with the plastic profile and is moved relative to the stationary plastic profile in the direction of the likewise stationary mold parts, preferably moved back counter to the production direction, is again brought into contact with the plastic profile, and subsequently the mold parts, in order to reach an initial position, are moved conjointly with the plastic profile and the holding means in the production direction. 
         [0015]    The invention furthermore provides in particular that in the case of the mold parts moving, the reinforcement between the mold parts and a material reserve that is located behind the mold, when viewed in the production direction, is pretensioned, preferably is pretensioned by way of the convex or the concave mold part, respectively, the reinforcement being pretensioned in particular in the shape of the plastic profile to be produced. In combination with the alternating movement of the mold parts, this pretensioning leads to the fibers of the reinforcement being integrated in the plastic profile in a targeted and firm manner, but without the formation of congestion and thus without warping. On account of the reinforcement being infed to the mold entries in the form of the plastic profile to be produced, a particularly uniform and thus stable and reliable production of the method is guaranteed. 
         [0016]    A device for achieving the object mentioned at the outset is a device for the production of a preferably curved plastic profile having a continuous reinforcement from strands, woven fabrics, and/or the like, having a mold which is movable counter to a production direction of the plastic profile along a portion of the plastic profile, and at least one holding means that, when viewed in the production direction, is positioned ahead of the mold, for at least temporarily retaining the plastic profile, characterized in that the mold is formed from at least two mold parts that in relation to the cross section of the plastic profile are split and that are movable in a temporally offset manner counter to a production direction of the plastic profile along a portion of said plastic profile. On account of the mold being formed from at least two mold parts that in relation to the cross section of the plastic profile are split and that are movable in a temporally offset manner counter to a production direction of the plastic profile along a portion of said plastic profile, almost every arbitrary individual plastic profile may be produced. The mold herein may be composed of a multiplicity of mold parts which are disposed so as to be parallel with and about the longitudinal axis of the plastic profile, conjointly forming the mold. The mold, or the mold parts, respectively, herein is/are not limited to rectilinear plastic profiles but may rather also have a radius for the production of curved or even annular plastic profiles. 
         [0017]    The invention furthermore preferably provides that the at least two mold parts are movable in a periodically alternating manner, or in steps, respectively, in particular at least at times simultaneously and/or temporally separately, counter to a production direction of the plastic profile along a portion of said plastic profile. Depending on the shape of the plastic profile to be produced it is provided that mold parts that by virtue of the curvature need to cover longer paths on the plastic profile are moved more frequently or across longer portions than mold parts that are disposed on an internal radius of the plastic profile. The movement of the individual mold parts counter to the production direction is mutually temporally tuned. It is thus provided that the movements partially overlap in temporal terms. However, it is also provided that a next mold part moves only once a preceding mold part has completed its movement. 
         [0018]    It is furthermore provided that the at least two mold parts are movable back and forth discontinuously or in steps, respectively, and herein are at least partially mutually opposite or protruding, respectively, along a longitudinal axis of the plastic profile. In the movement thereof along the plastic profile, the at least two mold parts are at all times located at least partially on top of one another, so as to mutually impart a hold or support, respectively. In this manner, a respective other mold part at least in regions has a face against which the former during the movement counter to the production direction may build up pressure and in this way form the plastic profile. 
         [0019]    A further preferred exemplary embodiment moreover provides that at least one mold part is configured as a hollow section, and the at least one further mold part is configured as a core which communicates with the hollow section, and that the at least one hollow section and the at least one core are movable in a temporally offset manner counter to a production direction of the plastic profile along a portion of said plastic profile, the at least one core preferably being movable in the at least one hollow section. In this manner, tubes having a reinforcement may also be produced by the reciprocating-step method, without a congestion of fibers being formed when the reinforcement enters the mold. In the case of this exemplary embodiment of the invention it is advantageous for the mold part that is configured as the core to be longer than the mold part that is configured as the hollow section. Thus, the core always initially moves counter to the production direction, whereupon the hollow section follows the core, forming the tube. 
         [0020]    It is provided in particular that at least one holding means is configured for the production of a releasable gripper connection to the finished plastic profile outside the mold, in particular ahead of the mold, and/or that each holding means is movable relative to the plastic profile. This holding means is configured in such a manner that it corresponds exactly to the shape of the plastic profile to be produced and may thus fully envelope the latter. 
         [0021]    It is furthermore provided according to the invention that the mold parts have opposite mold faces, in particular compact mold faces, which communicate with one another, one mold face preferably being configured so as to be concave relative to the cross section of the plastic profile, and the opposite mold face being configured correspondingly so as to be convex, or the mold faces being configured so as to be annular, in particular one mold part, preferably the convex mold part, in relation to the longitudinal axis of the plastic profile being longer that the other mold part. It is in particular conceivable for the mold faces to be configured individually and arbitrarily. The mold faces at all times run parallel with the surface of the plastic profile to the produced. 
         [0022]    According to one further exemplary embodiment of the present invention it is provided that the sides, or the end sides, respectively, of the mold parts that are moved first across the reinforcement, or the sides of the mold parts that face away from the production direction, respectively, on opposite mold faces have inlet ramps for receiving the reinforcement. These inlet ramps may have dissimilar angles, in particular relative to the production direction, and said inlet ramps in terms of the shape thereof depend on the shape of the plastic profile to be produced, or on the arrangement of the reserve or of the mold parts, respectively. 
         [0023]    It is furthermore provided that a separation unit, in particular a saw for sawing the molded plastic profile, is disposed ahead of the holding means in the production direction. On account thereof the plastic profiles produced may be cut up directly into predetermined lengths and be packed for transportation, for example. On account of cutting-up taking place directly ahead of the holding means, when viewed in the production direction, the profile does not have to be reclamped in a holding means for or after cutting-up, respectively, the latter instead being performed directly in the production. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]    Preferred exemplary embodiments of the invention will be explained hereunder in more detail by means of the drawing in which: 
           [0025]      FIG. 1  shows a perspective schematic view of an exemplary embodiment of a device according to the invention; 
           [0026]      FIG. 2 a    shows a schematic view of an exemplary embodiment of a device according to the invention, in an initial position; 
           [0027]      FIG. 2 b    shows a schematic view of the device of  FIG. 2 a    after a first operating step; 
           [0028]      FIG. 2 c    shows a schematic view of the device of  FIG. 2 a    after a second operating step; 
           [0029]      FIG. 2 d    shows a schematic view of the device of  FIG. 2 a    after a third operating step; 
           [0030]      FIG. 2 e    shows a schematic view of the device of  FIG. 2 a    after a fourth operating step; 
           [0031]      FIG. 3 a    shows a schematic view of a further exemplary embodiment of a device according to the invention, in an initial position; 
           [0032]      FIG. 3 b    shows a schematic view of the device of  FIG. 3 a    after a first operating step; 
           [0033]      FIG. 3 c    shows a schematic view of the device of  FIG. 3 a    after a second operating step; 
           [0034]      FIG. 3 d    shows a schematic view of the device of  FIG. 3 a    after a third operating step; 
           [0035]      FIG. 3 e    shows a schematic view of the device of  FIG. 3 a    after a fourth operating step; 
           [0036]      FIG. 4 a    shows a schematic view of a further exemplary embodiment of a device according to the invention, in an initial position; 
           [0037]      FIG. 4 b    shows a schematic view of the device of  FIG. 4 a    after a first operating step; 
           [0038]      FIG. 4 c    shows a schematic view of the device of  FIG. 4 a    after a second operating step; 
           [0039]      FIG. 4 d    shows a schematic view of the device of  FIG. 4 a    after a third operating step; 
           [0040]      FIG. 4 e    shows a schematic view of the device of  FIG. 4 a    after a fourth operating step; 
           [0041]      FIG. 4 f    shows a schematic view of the device of  FIG. 4 a    after a fifth operating step; 
           [0042]      FIG. 5 a    shows a perspective schematic view of a further exemplary embodiment of a device according to the invention, after a first operating step; 
           [0043]      FIG. 5 b    shows a schematic view of the device of  FIG. 5 a    after a second operating step; and 
           [0044]      FIG. 5 c    shows a schematic view of the device of  FIG. 5 a    after a third operating step. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0045]    The figures schematically show exemplary embodiments of the device according to the invention, which also serve for carrying out the method according to the invention. 
         [0046]    The device is a pultrusion device for a plastic profile  10  having an internal reinforcement  11  and a plastics material  12  surrounding the latter, said plastics material  12  potentially and preferably being a curable plastics material ( FIG. 1 ). In the exemplary embodiment of  FIG. 1  that is illustrated for the purpose of visualization it is assumed that the reinforcement  11  is composed of seven endless strands  13  of preferably high-tensile fibers, for example carbon fibers. However, other arbitrary reinforcements  11 , for example woven fabrics and/or warp-/weft-knitted fabrics, or a combination of the strands  13  with woven fabrics and/or warp-/weft-knitted fabrics, respectively, may also be embedded in the plastics material  12  of the plastic profile  10 . Also, the invention is not limited to the seven strands  13  that are shown in the figures. 
         [0047]    A plastic profile  10  having an arbitrary course may be produced by the schematically shown device and by the method according to the invention by way of pultrusion and with a respective mold or with respective mold parts, respectively. A straight plastic profile is shown in the figures by way of example. However, it is expressly also provided that plastic profiles  10  which possess an arcuate course, or a radius, respectively, in particular an arbitrary spatial (three-dimensional) course, to be produced by the device according to the invention and by the method according to the invention. 
         [0048]    The device of  FIG. 1  shown has a first mold part  14  and a second mold part  15 , the mold faces  16  and  17  thereof corresponding to the shape or the surface shape, respectively, of the plastic profile  10  to be produced. A longitudinal central axis of the mold parts  14  and  15  is thus aligned exactly like the plastic profile  10  to be produced. The convex shape of the mold face  17  of the second mold part  15  in the course thereof corresponds to the mold face  16  of the first and concave mold part  14 . The mold faces  16  and  17  are mutually tuned in such a manner that the former in the assembled state have a mutual gap or spacing  18 , respectively. This spacing  18  corresponds exactly to the thickness of the plastic profile  10 . In order for arbitrary profiles to be produced, the concave mold face  16  of the first mold part  14  may also deviate from the convex mold face  17  of the second mold part  15 . 
         [0049]    The first mold part  14  and the second mold part  15  are mounted in such a manner that the former are movable individually and mutually independently counter to a production direction  19  of the plastic profile  10  along the plastic profile  10 , or else conjointly in the production direction  19 . The device according to the invention is not limited to two mold parts; rather, it is conceivable for a multiplicity of mold parts to be provided around the plastic profile  10  for forming the latter. 
         [0050]    A gripper  21  envelops the plastic profile  10  ahead of the mold  20 , when viewed in the production direction  19 . The gripper  21  has a first gripper part  22  and a second gripper part  23 . The first gripper part  21  and the second gripper part  23  are movable perpendicularly to the production direction  19  up and down in such a manner that the former may release the plastic profile  10 , or may retain or grip the latter. To this end, internal faces of the first and the second gripper part  22  and  23  are configured in such a manner that said internal faces may envelop the plastic profile  10  in a form-fitting manner. The gripper  21  may be configured so as to be stationary, or the former may move back and forth along the plastic profile  10  ( FIG. 1 ). 
         [0051]    When viewed in the production direction  19 , a material reserve (not illustrated) from which the reinforcement  11  or the strands  13 , respectively, are unwound is located behind the mold  20 . According to the invention, the strands  13  are infed to the first mold part  14  and to the second mold part  15  in such a manner that the former already correspond to the shape of the plastic profile  10  to be produced. The strands  13  are pretensioned between the mold  20  and the material reserve, so that the former may be drawn-in in a targeted manner by the mold parts  14  and  15 . In order for the strands  13  not to be imparted excessive friction forces on the edges of the first and the second mold part  14  and  15 , the rearward ends  24  of the first and of the second mold part  14  and  15  each have inlet ramps  25  and  26 , respectively. The strands  13  run into the mold  20  along these inlet ramps  25  and  26  ( FIG. 2 a   , for example). 
         [0052]    An exemplary embodiment of a method according to the invention is schematically illustrated in  FIGS. 2 a  to 2 e   , using the example of a straight plastic profile  10 . However, the same method in a similar manner, using a respective mold  20  and a respective gripper  21 , may also be applied in order for a curved plastic profile  10  to be made. 
         [0053]      FIG. 2 a    illustrates an initial position. In this initial position the first and the second gripper part  22  and  23  of the gripper  21  enclose the plastic profile  10  along a circumference. The mold  20 , the gripper  21 , and a separation unit  27  such as a saw, for example, or a rotary cutter, are installed on a rail  28 . 
         [0054]    In a first operating step according to  FIG. 2 b   , the second mold part  15  is moved back counter to the production direction  19  on the rail  28 . The first mold part  14  as well as the gripper  21  herein do not modify their position relative to the plastic profile  10 . In the case of the movement of the second mold part  15 , strands  13  are brought into contact with the mold face  17  of the second mold part  15  by way of the inlet ramp  26  of the second mold part  15 . 
         [0055]    In a third operating step according to  FIG. 2 c   , the first mold part  14 , in a manner likewise to that of the second mold part  15 , is moved back counter to the production direction  19  on the plastic profile  10 . The first mold part  14  herein moves across the reinforcement  11 , or across the incoming strands  13 , respectively. The arrows that are illustrated in  FIGS. 2 a  to 2 e    identify movement directions of the individual elements. By way of the movement of the first mold part  14  across the second mold part  15 , the plastic profile  10  is molded from the reinforcement  11  and from the plastics material  12  so as to correspond to the mold faces  16  and  17 . 
         [0056]    In a third operating step according to  FIG. 2 d   , the first gripper part  22  is moved perpendicularly to the production direction  19  such that the plastic profile  10  is released by the gripper  21 . Subsequent to this release of the plastic profile  10  by the gripper  21 , the mold  20 , conjointly with the mold parts  14 ,  15 , and the plastic profile  10 , moves forward in the production direction  19 . In the case of this movement, reinforcement  11  is likewise unwound from the material reserve. As soon as the mold  20  is located in an initial position again, the gripper  21  according to  FIG. 2 b    again encompasses the plastic profile  10 , and the steps of  FIGS. 2 a  to 2 e    are repeated. 
         [0057]    A further exemplary embodiment of the device according to the invention, by which the method according to the invention may be carried out, is illustrated in  FIGS. 3 a  to 3 e   . The only point of difference between the exemplary embodiment illustrated in  FIGS. 3 a  to 3 e    and the exemplary embodiment illustrated in  FIGS. 2 a  to 2 e    lies in that a second mold part  29  is longer than a first mold part  30 . Elements in  FIGS. 3 a  to 3 e    that are identical to those from  FIGS. 2 a  to 2 e    are identified by the same reference signs. According to  FIG. 3 b   , the second mold part  29  is moved prior to the first mold part  30  counter to the production direction  19  for the production of the plastic profile  10 . However, it is also conceivable for the first mold part to be longer than the second mold part. 
         [0058]    A further exemplary embodiment of the method according to the invention is schematically illustrated in  FIGS. 4 a  to 4 f   . The device illustrated in these figures is substantially the same as the device illustrated in  FIGS. 2 a  and 2 e   . Therefore, identical elements are also identified by the same reference signs. 
         [0059]    An initial position of the method, in which both the gripper  21 , having the two gripper parts  22  and  23  thereof, and the mold  20 , having the mold parts  14  and  15 , are moved forward in the production direction  19  on the rail  28 , is illustrated in  FIG. 4 a   . The plastic profile  10 , conjointly with the reinforcement, is simultaneously moved in the production direction  19 . The three following operating steps of  FIGS. 4 b  to 4 d    are the same as the operating steps from  FIGS. 2 b  to 2 d   . In the following operating step the gripper  21 , the gripper parts  22  and  23  thereof being located in a position in which the former are released from the plastic profile  10 , is moved counter to the production direction  19  in the direction of the mold  20  ( FIG. 4 e   ). 
         [0060]    In the following operating step the gripper  21  acquires the plastic profile  10  in that the first gripper part  22  is lowered perpendicularly to the production direction  19  and conjointly with the second gripper part  23  firmly encompasses the plastic profile  10  ( FIG. 4 f   ). In order to return to the initial position again, the plastic profile  10 , conjointly with the reinforcement  11 , is now pushed in the production direction  19 , specifically with the closed mold  20  and the gripper  21 . On account of the plastic profile  10  being substantially pulled by the gripper  21  in the production direction  19 , the mold parts  14  and  15  do not have to be very heavily compressed. This may be advantageous when a particularly complex or sensitive plastic profile  10  is being produced by the mold  20 . 
         [0061]    A further exemplary embodiment of the device according to the invention, by which the method according to the invention may be carried out, is illustrated in  FIGS. 5 a  to 5 c   . The first mold part  32  is configured as a cylindrical core, or as a cylinder, respectively, in  FIGS. 5 a  to 5 c   . A second mold part  33  of the mold  34  is configured as a hollow cylinder that encloses the first mold part  32 . A tubular plastic profile  10  (not illustrated) is molded from the reinforcement and from the plastics material between the first mold part  32  and the second mold part  33 . The first mold part  32  is configured so as to be longer than the second mold part  33 . 
         [0062]    For the production of the tubular plastic profile  10  a plastics material and a reinforcement are molded in an intermediate space  35  which describes the shape of the plastic profile  10  to be produced. To this end, the second mold part  33  is initially moved in the production direction  36  across the first mold part  32  ( FIG. 5 a   ). The first mold part  32 , conjointly with the second mold part  33  and the plastic profile  10 , is subsequently moved forward in the production direction  36 . Herein, exemplary embodiments in which a gripper  21  (not illustrated) is stationary or is conjointly moved, as in  FIGS. 2 a  to 2 e  and 4 a  to 4 f   , are conceivable. 
         [0063]    The first mold part  32  in a subsequent operating step is moved back counter to the production direction  36  by the second mold part  33  ( FIG. 5 c   ). Herein, the reinforcement  11  (not illustrated), or the strands  13 , respectively, come to lie on a surface  37  of the first mold part  32 . According to  FIG. 5 a   , the second mold part  33  is then moved counter to the production direction  36  across the mold part  32  such that the plastic profile  10  to be produced is molded in the intermediate space  35 . This exemplary embodiment is also not limited to rectilinear hollow sections or tubes, respectively, but by a respective configuration of the mold parts may rather also be applied in the production of curved hollow sections. 
       LIST OF REFERENCE SIGNS 
       [0000]    
       
           10  Plastic profile 
           11  Reinforcement 
           12  Plastics material 
           13  Strand 
           14  First mold part 
           15  Second mold part 
           16  Mold face 
           17  Mold face 
           18  Spacing 
           19  Construction direction 
           20  Mold 
           21  Gripper 
           22  First gripper part 
           23  Second gripper part 
           24  Rearward end 
           25  Inlet ramp 
           26  Inlet ramp 
           27  Separation unit 
           28  Rail 
           29  Second mold part 
           30  First mold part 
           31  Mold 
           32  First mold part 
           33  Second mold part 
           34  Mold 
           35  Intermediate space 
           36  Production direction 
           37  Surface