DE1604471A1 - Device for manufacturing objects from plastic - Google Patents

Description

Paftitanwait

oip! .. fng. 6. Wäinhausen

Wldenmayepetrai 40 TeL ZQ βΐ SO

Munich, 2 & ÜUÜ 1968

C. 468

Calraec (Manufacturing) Limited
London (Great Britain)

Device for making articles from plastic Priority: July 29, 1965 (Great Britain)

The invention relates to an apparatus for manufacturing of objects made of plastic.

The device according to the invention for manufacturing objects from plastic has tools that back and forth are arranged movably on an elongated support frame which determines a movement path for the item to be treated, a conveying device for the continuous movement of heated material to be treated along the path of movement, a spreader, which is suitable, on the continuously moving item to be treated on its opposite, in the longitudinal direction of the movement path extending edges or in the vicinity of the same and a movement of these

009044/1396

To prevent edges across the web, a tool operator, which causes the tools to work on a part of the heated material to be treated, which is along the path of movement moves, deforming attack, a tool feed device for advancing the tools along the path of movement essentially at the same speed as the material to be treated, a moving device for moving the tools away from the item to be treated after a movement over a predetermined one Stretch, wherein the deformed part maintains the shape given to it, and a reset device for resetting the Tools along the path of movement in their starting position for attack on a subsequent part of the item to be treated.

The device can have a deformation device which serves to deform the material to be treated so that there is one each extending in the longitudinal direction at the said, opposite edges or in the vicinity of the same Has projection which protrudes transversely to the movement path, and a guide device which is attached to said, opposite edges or in the vicinity of the same each form a channel which has the same cross section as the projection and which receives it when the material to be treated moved along the path of movement, so that transverse movement of this projection is prevented.

In another embodiment, the device have a number of retaining elements that have facing parts due to the inherent elasticity of the elements are pressed against each other, the holding elements are arranged so that the items to be treated sugekehrten between each other

009844/1388

Dividing the holding elements is detected at points in the longitudinal direction the movement path at a distance from one another and arranged on the edges of the material to be treated or in the vicinity thereof are, and a drive for moving the holding elements acting on the material to be treated at a speed which corresponds approximately to the speed of the item to be treated. The drawing shows examples of the execution of the Device according to the invention, namely show

1 shows a side view of an installation according to the invention for producing objects from plastic,

FIG. 2 shows a side view of the strand conveyor device according to FIG. 1 on a larger scale,

Fig. 3 is a partial view in vertical section through the strand conveyor according to line III-III of Fig. 2,

4 shows a partial cross section along line IV-IV of FIG. 2, FIG. 5 shows a partial cross section along line VV of FIG. 2, FIG. 6 shows a front view of another embodiment of the device according to the invention,

7 shows a detail of FIG. 6 in a greatly enlarged hatred rod,

8 shows an illustration along line VIII-VIII of FIG. 7, FIG. 9 shows an illustration along line IX-IX in FIG. 7, and FIG FIG. 10 shows a plan view of part of the device according to FIG. 6.

According to FIGS. 1 to 5, the device for producing objects from plastic webs has a carriage 1 which mounted on an elongated support frame 2 so as to be movable to and fro is. If the support frame is arranged in the vicinity of the outlet 3 of an extruder 4, this frame determines a

0 098U / 1386

Movement path 6, along which the carriage can be moved back and forth towards the exit and away from it. On the Tools 7 are mounted on slide 1. A strand conveyor 8, 9 is used to advance the emerging from the outlet Strand along the path, which is determined by the support frame. A hydraulically operated tool actuation device is on the slide provided, under the action of which the tools near the outlet on part of the heated Attack the strand in a deforming manner. For advancing the carriage and the tools engaging the strand along the path in a direction leading away from the outlet serves essentially with the exit speed of the strand from the exit a slide feed device 11. On the slide, a push-off device is provided, which the tools after a Pulls movement a predetermined distance from the strand, wherein the deformed strand portion maintains its shape. In the end a resetting device is provided, which resets the slide in rapid traverse along the path to its starting position, so that the tools can attack a following part of the string.

Fig. 1 shows a conventional extruder 4 with a heating chamber, a feed container 12 for supplying powder Plastic to the inlet of the heating chamber and a screw conveyor (not shown) for supplying heated material to be treated from the chamber and for pressing the material to be treated through an extrusion nozzle at outlet 3 of the extruder in the form of a material web 14. The extruder 4 is mounted on a frame 13, and the extrusion nozzle is arranged so

0098U / 1386

that the material web 14 moves vertically downwards from the outlet 3 .

2 to 5 show a standing support frame 2, which is below the outlet 3 of the extruder a vertical downward movement path 6 for the coming out of the exit, heated web of material 14 is determined. The support frame 2 has a sturdy base 16 on which four support columns 18 a frame head 17 is mounted, which is immediately below the exit of the extruder is located.

The frame head 17 has an upper plate 19 which is mounted on the upper ends of the support columns 18 and with a central, rectangular opening 21 is provided through which the material web 14 can move downwards. The conveyor is carried by side plates 22 of the frame head 17. These side plates extend on opposite sides Sides of the material web downwards.

The conveyor device 8 has upper conveyor rollers 23 and 24 which are on opposite sides of the material web 14 and mounted on parallel shafts 26 and 28. The shafts 26 and 27 are rotatable in bearings in the Side plates 22 are provided. The housings 28 of the bearings for the shaft 26 are fixedly arranged on the relevant side plates. The housings 29 of the bearings for the shaft 27 can be moved horizontally with the aid of compressed air actuated piston drives 31. The housings 29 are adjusted so that the distance between the rollers 23 and 24 is slightly smaller than that Thickness of the web of material 14 emerging from the outlet 3 of the extruder occurs.

The two upper conveyor rollers 23 and 24 have

009844/1388

in each case a mean segment 32 of constant diameter and end segments 33 which interact with one another in such a way that the longitudinal edges the material web 14 are deformed. For this purpose, the end sections 33 of the rollers are each with a flange 34 and a groove 36 is provided. The flange 34 and the groove 36 are triangular in cross section. That of the middle stretch 32 of the roller the closer side of this triangle is essentially normal to the roll axis. Each flange 34 of a roller lies in a groove 36 opposite the other roller and engages in this groove when the roller 24 is in the operating position indicated above is pressed.

According to Fig. 4, the middle section 32 of the upper conveyor roller 23 is hollow and provided with a heating coil 37, which touches the inner wall of the jacket of this roller line. To heat this middle section, the heating coil 37 ' supplied with oil through channels 38 which extend from a coupling at one end of the shaft 26 through that shaft.

The end sections 33 of the roller 23 are also hollow and each provided with a heating coil 42, which the inner wall touches the route in question. To cool the end sections 33, water is supplied via channels 43, which extend from a coupling 45 on the opposite of the coupling 41 Extend the end of the shaft 26 through this.

The middle distance of the upper feed roller 24 wira also heated with oil, which is fed to this route through channels in the shaft 27, not shown. The end lines 33 the roller 24 are cooled with water, which is supplied via channels (not shown) inside the shaft 27. .

009844/1388

160U71

The water channels 43 for cooling the end sections 33 of the roller 23 are arranged at the opposite end as the water channels for the roller 24. Furthermore, the oil channels 38 are arranged at the opposite end of the roller 23 as the Oil channels for the roller 24.

The upper conveyor rollers 23 and 24 pull the web of material from the outlet 3 of the extruder 4 downwards into the movement path 6. These rollers 23 and 24 are moved to the one described below Way with a ümfangsgeschwxndigkext, - ^ ie higher than the speed with which the material web is discharged from the outlet 3, so that the material web 14 thins as it approaches the rollers. The distance between the rollers 23 and 24 and their speed in relation to the exit speed of the material web from the extruder are adjusted so that a material web of the desired thickness is obtained.

When passing between the upper conveyor rollers 23 and 24, the material web 14 is on both longitudinal edges of the facing end sections of the rollers detected / so that the end edges the shape of the narrow space between them Accept final routes.

After leaving the upper conveyor rollers 23 and 24, the middle or main part of the material web is located still in a heated, plastic state. They are against it Edges of the web of material have been cooled down by the end sections of the rollers to such an extent that they retain the shape given by them the final routes was granted. According to FIG. 5, the web of material leaving the rollers 23 and 24 is thereby in the vicinity of it both edges with two extending in the longitudinal direction

0098U / 13Ö6

• - 8th -

mm Q -

Projections 46 provided in opposite directions protrude laterally from the trajectory 6. Each of these two projections 46 consists of two extending in the longitudinal direction extending, generally flat side parts 47 and 48, which are inclined outwardly with respect to the path of movement and at their from edges distant from the trajectory are connected to one another. The side part 47 removed from the edge of the material web 14 each projection is arranged in a plane normal to the movement path 6.

According to FIGS. 2, 3 and 5, a guide device 49 extends from the base 16 of the support frame 2 to just under below the upper conveyor rollers 23 and 24. This guide device engages the deformed parts of the web of material 14 while it is moving downwards along the path of movement 6. The guide device has two upward guide elements 51 and 52 in the vicinity of each edge of the material web, which are arranged on opposite sides of the material web through which cooling water is passed.

In each guide element 51 or 52, the surface facing the material web 14 consists of brass or a polytetrafluoroethylene coating. A longitudinal rib 54 and a longitudinal groove 56 are formed in this surface. These grooves and ribs have the same cross-section as the flanges 36 and the grooves 34 of the upper conveyor rollers 23 and 24. When the guide elements 51 and 52 are in their operative position, the rib 54 of each element engages in the groove 56 of the associated element and the two elements are located transversely to the web of material at a distance from one another which is slightly greater than the thickness

0Q98U / 13 86

160A471

of the material web 14. Between the elements 51 and 52 there is therefore a narrow channel which has the same cross section like the deformed part of the material web.

According to FIG. 3, the guide elements 51 extend and 52 vertically upward for most of its height. Of the Distance between the guide elements on one edge of the material web and the guide elements on the other edge of the material web is greater than the distance between the end stretches 33 of an upper conveyor roller 23 or 24. Near its upper end each guide element 51 or 52 is curved inwardly towards the elements on the opposite edge of the web of material. Of the uppermost part 57 of each element is again arranged vertically and is located vertically directly below the corresponding one End section 33 of a conveyor roller.

After the exit from the space between facing end stretches of the conveyor rollers 23 and 24 each deformed edge part of the material web 14 is guided into the channel between two mutually facing guide elements 51 and 52. When the material web is drawn down between the upper parts of the guide device 49 in the manner described below is, the opposite edges of the material web are further removed from each other, so that the material web stretched somewhat and held under tension during the molding process that now follows.

According to FIGS. 2 to 5, two upper horizontal supports 58 are provided just below the upper conveyor rollers 23 and 24 and two lower horizontal supports 59 are provided on the base for fastening the guide elements 51 and 52 on the support frame

0098U / 1386. _Io "

mounted on the supporting structure.

The upper beams 58 extend normal to the plane of the web of material 14 spaced outwardly from one another opposite edges of the material web and are attached to the upper plate 19 with support pieces 61. Every guiding element 52 on the front side of the material web 14 is fastened to the associated carrier 58 with a screw 62. Every guiding element 51 on the back of the material web is also fastened to the associated carrier with a screw 63. However, this screw penetrates a horizontal slot 64 of the carrier 58. As a result, the position of the upper end each guide element 51 can be changed with respect to the carrier 58. In this way, the element 51 can be adjusted compared to the front guide element 52 for the purpose of adaptation to the thickness of the material web possible.

Each guide element 52 on the front side of the material web is at its lower end with a screw 66 attached to the lower bracket 59. A horizontal movement of the lower ends of the rear guide member 51 is thereby allows the screw 67 to pass through a horizontal slot 68 of the bracket for securing the element to the bracket.

The material web is withdrawn from the upper conveyor rollers 23 and 24 with the aid of the lower conveyor device 9, which is arranged in the base 16 of the supporting structure 2 (Fig. 2 and 3). This lower conveyor 9 has a lower conveyor roller 69 on a shaft 71 which is vertically below the upper Conveyor roller 24 is arranged. The conveyor roller 69 has a wide, central section 72 of constant diameter and end sections 73 which correspond to the end sections of the roller 24. Under

0098U / 138S

- 11 -

the lower feed roller 69 is a shaft 74, each having a disc 76 at both ends, corresponding to cross-section of the associated end stretch 33 of the upper conveyor roller 23rd From the guide device 49 the material web changes downwards and then horizontally. The deformed edge parts of the material web enter between an end section 73 of the lower conveyor roller 79 in one of the disks 76 and the main part of the material web engages the middle section 72 of the lower conveyor roller 69.

The shaft 71 of the lower conveyor roller 79 is driven by a drive device, not shown, which in the Base 16 of the support frame 2 is arranged. The drive to the upper conveyor rollers 23 and 24 is carried out by the shaft 71 Transferring endless chains 77, which are arranged on opposite sides of the supporting structure and each around a sprocket 78 on the shaft 71 and another sprocket 79 on the shaft 26 or 27 of the corresponding upper conveyor roller. At the downward strand of each chain engages one side acting coupling 81, which is provided on the carriage 1 and ensures that the carriage is approximately the same Speed as the material web 14 moves downwards, while the slide can be quickly returned to the top after the deformation process.

The lower conveyor roller 69 is driven at a slightly higher peripheral speed than the upper conveyor rollers 23 and 24, so that the web of material not only as above has been described, is tensioned in its transverse direction, but also in the longitudinal direction.

00984 4/138-fi-

- 12 -

The tools 7 provided on the slide 1 are arranged on opposite sides of the material web 14 and can be moved sideways in relation to it, namely from retreat positions, in which they have moved away from the material, in active positions in which they shape objects and not Attack attacks shown, which are provided on the carriage. The tools are cutting elements in the form of not shown Associated with knives. These are attached to one of the tools and grip a surface of the material web on the circumference of each formed in a part of this path object when the tools are in their operative position. On the opposite The other tool attacks the surface of the web of material. At the end of a deformation process, the tools increased pressure is exerted so that they are pressed more firmly against each other and the knives against parts opposite them the opposite tools are pressed and thereby pass through the material web and the shaped objects separate from her.

The device is equipped with a hydraulic system and provided a control device. These facilities ensure that the movement of the tools until they touch a heated part of the material web immediately below the head 17 of the support frame 2, the downward movement of the carriage 1 and the tools 7 in the active position approximately at the speed of the downward movement of the material web, the actuation of the cutting device, the moving away of the tools from the material web and the rapid retraction of the slide in its upper position so that the tools can attack the following part of the material web, one after the other and in

0D98U / 1386

BATHROOM ORIGINAL - 13 -

160A471

a predetermined time relationship.

During a deformation process, one of the tool elements is moved laterally against the material web 14 and tries to do this, the opposite edges of the material web pulling inwards towards each other. As a result of the deformed projections 46 of the material web 14 attacking the guide device 49 this movement is prevented. Therefore, the material web is in their during the entire deformation process correct position in the trajectory 6 held.

Since the material web 14 is still flexible even in the cooled state, the material would move out of the guide device 49 emerge if there is only a single longitudinal projection at each edge of the material web or in the vicinity thereof were. By arranging two projections 46 on opposite sides On the side of the material web, the exit of the material web from the guide device 49 is made very difficult. The resistance to movement of the projections is also thereby that the removed from the edge of the material web Side part 47 of each projection perpendicular to the plane of the Material web is arranged.

As a result, the distance between two mutually facing guide elements can be greater than is otherwise possible would be, so that the guide device hinders the movement of the material web along the movement path less severely.

The one described above and in FIGS. 1 to 5 The device shown is particularly suitable for the production of objects from foils made of polystyrene acetate and butyrate acetate, which are deformable when hot and can be stabilized in their shape by rapid cooling.

009044/1388 _ ₁₄ _

The device can also be modified for the production of objects from an extruded plastic tube will. In this case, the wide, middle distances 32 of the upper conveyor rollers 23 and 24 have a smaller one Diameter and these rollers are arranged so that the majority of the material web pass between these sections of the rollers can without being flattened. The hose is at two diametrically opposite points from detected the end sections of the rollers and there flattened and deformed in the manner described above.

Figs. 6 to 10 show another embodiment the device. Corresponding parts are provided with the same reference numerals as in FIGS. 1 to 5. Generally the device shown in FIGS. 6 to 10 on a carriage which can be moved to and fro on an elongated support frame 2 is mounted. When the support frame is near the exit 3 of an extruder 4 is arranged, this frame defines a movement path 6, along which the slide to the outlet can be moved back and forth to and from it. Tools 7 are mounted on the slide 1. A strand conveyor 8, 9 is used to advance the strand emerging from the outlet along the path passing through the support frame is determined. A hydraulically operated tool actuation device is provided on the slide, which acts attack the tools in the vicinity of the outlet deforming part of the heated strand. To advance the Slide and the tools engaging the strand along the path in a direction away from the outlet in the essentially with the exit speed of the strand

009844/1388 '

a slide feed device 11 is used for the exit A push-off device is provided for the slide, which moves the tools over a predetermined distance peeled off the strand, the deformed strand portion maintaining its shape. Finally, a reset device is provided, which returns the slide in rapid traverse along the path to its starting position, so that the tools on a can attack the following part of the strand.

The conveyor 8 and 9 of the device according to FIGS. 6 to 10 has two upper conveyor rollers 82 and two lower conveyor rollers 83. These conveyor rollers have a constant diameter over their entire length. As a result will be the edges of a web of material 14 coming from the extruder are not deformed by the upper conveyor rollers 82, but the upper ones Conveyor rollers 82 emit a flat web of material that descends into the path of movement determined by the supporting structure 2 to be led.

In this device, a spreader 84 is provided which engages the two longitudinal edges of the material web 14, while this moves along the path of movement that is determined by the supporting structure. That way will prevents sideways movement of the edges while the tools attack the material web.

The spreader 84 has an endless chain 86 with two vertical ones on each of the two edges of the material web 14 Strands that extend between the sprockets 87 and 88, the below the upper conveyor rollers 8 2 and above the lower Conveyor rollers 83 are arranged. The sprockets 87 and are arranged so that each chain 86 lies in a plane which

009844/1386

ORIGINAL BATHROOM - 16 -

is parallel to the plane of the web of material 14, and the downward running Strand of each chain is arranged at a small distance from a downwardly moving edge of the material web.

According to FIGS. 7 and 9, a clamping piece 89 made of elastic sheet metal is arranged on each link of the chains 86 and is bent into a U-shape at one end. The other end of the clamping piece extends at right angles to the one leg of the U and is attached to the chain. Each clamping piece 89 is arranged opposite the chain 86 so that the two legs of the U are arranged on opposite sides of the material web 14 during the downward movement of the clamping piece and one Include the edge of the web of material.

To guide the clamping pieces 89 in such a way that they engage the material web 14 is in the vicinity of the upper sprocket 87 a stationary guide plate 91 is arranged, which lies in a plane which is parallel to the plane of the material web. When a clamping piece 89 runs around the upper sprocket 87, the legs of the U engage the guide plate 91 and are thereby pressed apart, so that with the further movement of the clamping piece around the chain wheel 87 these legs engage on opposite surfaces of the plate 91. The guide plate 91 is arranged so that the two legs a clamping piece can be withdrawn from the plate 91 when they enter the downward strand of the chain 86. After this Leaving the plate 91, the legs of the U spring against one another as a result of the elasticity of the clamping piece and embrace in the process the edge of the material web.

BATH ORIGINAL

0098U / 1386 ~ ¹⁷ "

160U71

The upward and downward running strand of each chain 86 and the clamping pieces 89 attached to this strand are arranged in a housing 92.

The arranged on both edges of the material web 14 upper chain wheels 87 are rotatably mounted in the support frame. According to FIGS. 6 and 10, the two lower chain wheels 88 each attached to a spindle 94, which is in a horizontal carrier 96, which is located on the front of the material web 14 is located, is rotatably mounted in bearings. A horizontal shaft 97 extends parallel to the material web 14, are attached to the two bevel gears 98 which mesh with bevel gears 99, which are attached to the spindles 94 of the sprockets 88 distal ends are attached. A sprocket 101 is attached to one end of the shaft, which is supported by a sprocket 102 one of the lower conveyor rollers 83 is driven on the shaft 103. The drive is from the shaft 103 to the Chains 86 are transmitted via sprockets 102 and 101, shaft 97, sprockets 98 and 99, and sprockets 88.

During operation of the device according to FIGS. 6 to 10, the chains 86 are placed on both edges of the material web 14 driven at the same speed as the web of material between the upper and lower conveyor rollers 82 and 83 of the device moved. When a clamping piece 89 engages the edge of the material web 14, it therefore moves with it the same speed as this downwards and only exerts a very low speed on it in the longitudinal direction of the material web Train off. On the other hand, the engagement of the clamping pieces on the material web 14 prevents the edges of the material

BAD OBiGWAL.

009844/1386 - ie -

be pulled sideways when the tools are in their Move active position. ■

The device according to FIGS. 6 to 10 is suitable for the manufacture of objects made of polyethylene, polypropylene or polyvinyl chloride. These plastics cannot solidify as rapidly as those relating to the above Device according to FIGS. 1 to 5 specified materials.

The device according to FIGS. 6 to 10 can also

for the manufacture of objects from extruded tubing material modified v / ground when the material is detected only at two diametrically opposed points, while it is moved down by the upper conveyor rollers. The clamping pieces 89 are then arranged so that they are attached to the material attack at these locations as it moves along the path determined by the support frame.

The device according to the invention can of course also be used to manufacture objects from a film drawn from a roll rather than extruded material coming directly from the exit of a Extrusion press is coming »

BAD OPiIGIMAL

- 19 -

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Claims (1)

Patent claims: ■ Λ l. \ Device for manufacturing objects made of plastic, characterized by tools (7) which are arranged so that they can be moved back and forth on an elongated support frame (2) which determines a movement path (6) for the material to be treated (14), a conveyor device ( 8, 9) for the continuous movement of heated items to be treated (14) along the path of movement (6), a spreader (49; 86) which is suitable for attaching to the continuously moving items to be treated on their opposing items in the longitudinal direction of the path of movement ( 6) to attack extending edges or in the vicinity thereof and to prevent movement of these edges transversely to the web, a tool actuating device (31), which causes the tools (7) on a part of the heated material to be treated (14), the moves along the movement path (6), engages in a deforming manner, a tool feed device (1, 81) for advancing the tools along the movement path essentially with de r the same speed as the item to be treated, a moving device (31) for moving the tools away from the item to be treated after a movement over a predetermined distance, the deformed part maintaining the shape given to it, and a reset device for returning the tools along the path of movement to their starting position Attack on a subsequent part of the item to be treated. 2. Device according to claim 1, characterized by a deformation device (23, 24) _? which serves to BATH ORIGINAL ÖQSS44 / 138S '■ - 20 - To be treated {14) in such a way that it is opposite edges or in the vicinity of them each has a protrusion extending in the longitudinal direction, which protrudes transversely to the path of movement, and a guide device attached to said, opposite one another Edges or in the vicinity of these each forms a channel which has the same cross-section as the projection and accommodates it, when the material to be treated moves along the path of movement, so that this projection prevents transverse movement will. 3. Device according to claim 2, characterized by a deformation device (33) which serves to treat the material to be treated (14) to be deformed so that at its opposite edges or in the vicinity of the same two each in the longitudinal direction, protruding parts (47, 48) are formed which are sideways from said movement path protrude in opposite directions, and guide means (49 attached to each of the opposite Edges or near them forms a channel with the same cross-section as the part of the item to be treated, in which the two projecting parts (47, 48) are formed. 4. Apparatus according to claim 2 or 3, characterized in that that the two projections (46) of the item to be treated (14) each consist of two in the longitudinal direction extending, generally flat side parts (47, 48) are made, inclined outward from said movement path (6) and at their from the Trajectory distant edges are connected. BATH ORIGINAL 009844/1386 - 21 - 5. Apparatus according to claim 4 _f, characterized in that the side part (47) of each projection (46) remote from the edge of the material to be treated (14) is arranged in a plane which is normal or substantially normal to said movement path (6) . 6. Device according to one of claims 2 to 5, characterized in that the distance between the guide (51, 52) at one edge of the item to be treated (14) or in the Sew this edge and the guide (51, 52) on the opposite edge of the item to be treated (14) or in the vicinity of this edge in an initial section of the path of movement (6) in the direction of movement the item to be treated (14) increases, so that in its Movement along this initial stretch are opposite to one another Edges of the item to be treated are moved apart and the item to be treated is thereby exposed to tensile forces. 7. Device according to one of claims 2 to 6, characterized by two interacting rollers (23 t 24), between which the material to be treated (14) moves through at the entry into the movement path (6), and which are arranged so that the material to be treated is detected at its two edges or in the vicinity of the same between end sections (33) of the rollers, these end sections are shaped so that the material to be treated (14) exiting between the rollers (23, 24) with said longitudinally extending projections (46) is formed. 8. Apparatus according to claim 7, characterized in that the rollers (23/24) serve to pull the material to be treated (14) into said movement path, each roller having a central 009844/1388 -22- lere route (32) which is heated so that that of her touched, middle part of the material to be treated (14) enters the movement path (6) in a heated state in which the item to be treated is deformable, and the end sections (33) of the rollers (23, 24) are cooled so that the item to be treated maintains the shape given to it by the end lines. 9. Device according to one of claims 2 to 8, characterized in that the guide device (49) has guide elements (51, 52) facing one another and forming the channel, the lateral spacing of which can be adjusted from one another is, so that the width of the channel can be adapted to the thickness of the material to be treated (14). IQ. Device according to claim 1, characterized by a series of Haiteelemente (89), which as a result of the inherent elasticity of the elements are pressed against one another, the holding elements (89) being arranged in such a way that the material to be treated (14) is between mutually facing parts of the holding elements is detected at points in the longitudinal direction of the movement path (6) at a distance from one another and at the edges of the material to be treated (14) or in the vicinity thereof, and a drive (103, 102, 101, 97, 98, 99, 88, 86) for moving the holding elements (89) engaging the item to be treated (14) at a speed which is approximately the speed corresponds to the item to be treated (14). 11. The device according to claim 10, characterized in that the holding elements (89) on endless chains (86} mounted on opposite edges of the treatment 009844/1386 " ²³ ~ , ■ ■ "160Α471 good (14) or are arranged in the vicinity of these edges and each have a run parallel to the movement path (6), and that a drive (103, 102, 10Ϊ, 97, 98, 99, 88) for moving forward of said strand of the chain is provided approximately at the speed of movement of the material to be treated (14) ^. 12. The device according to claim 11, characterized in that that each holding element (89) engages a guide plate (91) before the material to be treated (14) is grasped, which causes the parts of the holding element to be pressed apart during its further movement, so that they are then on the Can attack the material to be treated (14). 009844/1386