METHOD FOR MANUFACTURING A PLASTIC DRAIN SHEET, AND PLASTIC DRAIN SHEET

Abstract

The invention describes a method for manufacturing a plastic drain sheet, and a plastic drain sheet. For the purpose of manufacture, a sheet-like main body having a first surface and a second surface, spaced apart therefrom by a base sheet thickness, is provided. Grooves are introduced into the first surface and mating grooves are introduced into the second surface. The mating grooves and the grooves cross one another at crossing points. Through-openings between the grooves and the mating grooves are formed at the crossing points.

Claims

1. A method for manufacturing a plastic drain sheet, the method comprising haying the steps of: providing a sheet-like main body having a first surface and a second surface, spaced apart from the first surface by a base sheet thickness of the main body, introducing grooves into the first surface of the main body, introducing mating grooves into the second surface of the main body, wherein the mating grooves and the grooves cross one another at crossing points (9), and forming through-openings between the grooves and the mating grooves in the region of the crossing points to complete the plastic drain sheet.

2. The method as claimed in claim 1, wherein the main body is extruded by means of a slit die extruder.

3. The method as claimed in claim 1, wherein the main body comprises at least one of the following materials: polyethylene (PE), polypropylene (PP), polyamide (PA), polystyrene (PS), acrylonitrile butadiene styrene copolymer (ABS), wood-plastic composite material (WPC), biopolymers, polyvinyl chloride (PVC) and polyethylene terephthalate (PET).

4. The method as claimed in claim 1, wherein the grooves are introduced into the first surface of the main body in such a way that said grooves run one of in a longitudinal direction of the main body and perpendicular thereto.

5. The method as claimed in claim 1, wherein the grooves are introduced in the direction perpendicular to the first surface with a depth d1 and the mating grooves are introduced in the direction perpendicular to the second surface with a depth d2, wherein the sum of d1 and d2 is one of greater than and equal to a sheet thickness of the main body.

6. The method as claimed in claim 1, wherein the through-openings are introduced at least one of pneumatically, hydraulically and mechanically.

7. The method as claimed in claim 1, wherein a surface profiling is created on at least one of the surfaces of the main body in regions between at least one of the grooves and the mating grooves.

8. The method as claimed in claim 1, wherein at least one of the surfaces of the main body is notched.

9. The method as claimed in claim 1, wherein at least one of the grooves and the mating grooves are formed in with a mean surface roughness in accordance with DIN 4768 part 1 of between 0.2 μm and 0.7 μm.

10. The method as claimed in claim 1, wherein a cover layer is applied to at least one of the surfaces of the main body.

11. A plastic drain sheet produced as claimed in claim 1.

12. A plastic drain sheet, comprising a sheet-like main body having a first surface and a second surface, spaced apart from the first surface by a base sheet thickness of the main body, grooves introduced into the first surface of the main body, mating grooves introduced into the second surface of the main body, wherein the mating grooves and the grooves cross one another at crossing points, and through-openings between the grooves and the mating grooves in the region of the crossing points.

13. The plastic drain sheet as claimed in claim 12, wherein at least one of the grooves and the mating grooves have one of a tunnel-shaped, a rectangular and a trapezoidal cross section.

14. The plastic drain sheet as claimed in claim 12, wherein the main body has a width of between 2 m and 8 m.

15. The plastic drain sheet as claimed in claim 12, comprising a mean surface roughness in accordance with DIN 4768, Part 1 of between 0.2 μm and 0.7 μm, at least in the region of at least one of the grooves and the mating grooves.

16. The plastic drain sheet as claimed in claim 12, comprising a surface profiling on at least one of the surfaces of the main body in the region between at least one of the grooves and the mating grooves.

17. The plastic drain sheet as claimed in claim 12, comprising a weight per unit area of between 1 500 g/m.sup.2 and 18 000 g/m.sup.2.

18. The plastic drain sheet as claimed in claim 12, wherein the main body comprises at least one of the following materials: polyethylene (PE), polypropylene (PP), polyamide (PA), polystyrene (PS), acrylonitrile butadiene styrene copolymer (ABS), wood-plastic composite material (WPC), biopolymers, polyvinyl chloride (PVC) and polyethylene terephthalate (PET).

19. The plastic drain sheet as claimed in, comprising a cover layer on at least one of the surfaces of the main body.

20. The plastic drain sheet as claimed in claim 12, comprising at least one reinforcing structure embedded into the main body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0065] FIG. 1 shows a perspective view of a plastic drain sheet,

[0066] FIG. 2 shows a longitudinal section through the plastic drain sheet according to FIG. 1 along the cutting edge II-II,

[0067] FIG. 3 shows a cross section through the plastic drain sheet according to FIG. 1 along the cutting edge III-III,

[0068] FIG. 4 shows a schematic method sequence for manufacturing a plastic drain sheet,

[0069] FIG. 5 shows a schematic illustration of a manufacturing apparatus for manufacturing a plastic drain sheet,

[0070] FIG. 6 shows a schematic illustration of a further manufacturing apparatus for manufacturing a plastic drain sheet,

[0071] FIG. 7 shows a schematic illustration of alternative cross sections of the grooves of

[0072] FIG. 8 shows a cross section through a further exemplary embodiment of a plastic drain sheet.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0073] FIGS. 1 to 3 show an exemplary embodiment of a plastic drain sheet. The plastic drain sheet 1 has a sheet-like main body 2. The sheet-like main body 2 extends in a longitudinal direction 3 and a transverse direction 4 running perpendicular thereto. Only part of the plastic drain sheet 1 is shown in FIG. 1. The plastic drain sheet 1 extends in the longitudinal direction 3 beyond the part shown in FIG. 1. FIG. 2 shows a longitudinal section through the plastic drain sheet 1 in the longitudinal direction 3 along the cutting edge II-II. FIG. 3 shows a cross section through the plastic drain sheet 1 in the transverse direction 4 along the cutting edge III-III.

[0074] The plastic drain sheet 1 has a length in the longitudinal direction 3 and a width B in the transverse direction 4. The longitudinal direction 3 and the transverse direction 4 span a sheet plane. Perpendicular to the sheet plane, i.e. in a direction perpendicular to the longitudinal direction 3 and to the transverse direction 4, the main body 2 of the plastic drain sheet 1 has a constant sheet thickness d. The length and the width B are greater than the sheet thickness d by a multiple. The plastic drain sheet 1 has a width B of 2 m. Greater widths B of up to 8 m and over are also possible. In principle, the length is unrestricted and can exceed the width B. By way of example, lengths of over 10 m, in particular over 50 m, in particular over 100 m, in particular over 200 m are possible. The sheet thickness d is typically between 4 mm and 10 mm.

[0075] The main body 2 has a first surface 5 which constitutes the bottom side of the plastic drain sheet 1 in FIGS. 1 to 3. In addition, the main body 2 has a second surface 6 which is spaced apart from the first surface 5 by the sheet thickness d and is shown in the figures as the top side of the plastic drain sheet 1. Grooves 7 are formed into the first surface 5. The grooves 7 run parallel to one another in the longitudinal direction 3 of the plastic drain sheet. Mating grooves 8, which run parallel to one another in the transverse direction 4, are formed into the second surface 6 of the main body 2. The grooves 7 and the mating grooves 8 thus run perpendicular to one another and cross one another at crossing points 9. Through-openings 10 between the grooves 7 and the mating grooves 8 are formed in the region of the crossing points 9.

[0076] The grooves 7 and the mating grooves 8 constitute flow channels for water which is to be discharged through the plastic drain sheet 1. A water permeability of the plastic drain sheet 1 perpendicular to its sheet plane is ensured by the through-openings 10. The configuration of the plastic drain sheet 1 as a sheet-like main body 2 in which grooves 7 and mating grooves 8 have been formed ensures good water mobility combined with high stability, in particular high compressive strength, high internal shear strength, high contact shear strength and high dimensional stability. The plastic drain sheet has a high water discharge capability over its entire service life.

[0077] The grooves 7 and the mating grooves 8 have a cross section Q. The cross section Q is rectangular in each case. The grooves 7 have a regular spacing B.sub.2 and a width B.sub.1 in the transverse direction 4. The mating grooves 8 have a width L.sub.1 and a regular spacing L.sub.2 in the longitudinal direction 3. The spacings B.sub.2 and L.sub.2 can be between 2 mm and 16 mm, in particular between 3 mm and 10 mm. The widths B.sub.1 and L.sub.1 are for example between 2 mm and 12 mm, in particular between 3 mm and 10 mm.

[0078] The rectangular cross section Q of the grooves 7 and the mating grooves 8 ensures a high water discharge capability. At the same time, the main body 2 has high stability.

[0079] The grooves 7 are formed into the first surface 5 with a depth di perpendicular to the sheet plane of the main body 2. The mating grooves 8 are formed into the second surface 6 with a depth d.sub.2 perpendicular to the sheet plane. The depths d.sub.1 and d.sub.2 are dimensioned in such a way that the sum thereof is equal to the sheet thickness d: d.sub.1+d.sub.2=d. This has the effect that the grooves 7 overlap the mating grooves 8 in the region of the crossing points 9 perpendicular to the sheet plane, and therefore the through-openings 10 are obtained.

[0080] In order to further increase the water mobility of the grooves 7 and the mating grooves 8, the edge faces thereof formed by the main body 2 have a mean surface roughness in accordance with DIN 4768, Part 1 of between 0.2 μm and 0.7 μm. This ensures continuous flow channels in the grooves 7 and mating grooves 8. Unnevennesses in the micro range are avoided.

[0081] In regions between the grooves 7 and/or the mating grooves 8, the first surface 5 and the second surface 6 have a surface profiling in the form of a microprofiling 11. The microprofiling 11 has what are known as spikes and/or straight-line elevations with a height of between 0.1 mm and 1.1. mm. The height of the microprofiling 11 is measured as an asperity height in accordance with ASTM D7466. The effect of the microprofiling 11 is an improved contact shear strength of the plastic drain sheet 1.

[0082] The main body 2 of the plastic drain sheet 1 comprises polyethylene (PE). PE-LLD, PE 80, PE 100, PE 100-RC, PE-EL, PE-MD or PE-HD are particularly suitable. Alternative materials for the main body 2 of the plastic drain sheet 1 are polypropylene (PP), polyamide (PA), polystyrene (PS), acrylonitrile butadiene styrene copolymer (ABS), wood-plastic composite materials (WPC), biopolymers, polyvinyl chloride (PVC) and/or polyethylene terephthalate (PET). In some exemplary embodiments, the main body 2 is manufactured from recycled material (re-work material), reclaimed material (post-industrial material) and/or recyclate (post-consumer material). In yet other exemplary embodiments, fillers, in particular inert fillers, are also admixed with the main body 2. Examples of this are rock flour, wood flour, biopolymers and short fibers. The admixing of fillers makes it possible to adapt the material properties of the main body 2 of the plastic drain sheet 1 even better to the requirements to be met.

[0083] The plastic drain sheet 1 has a weight per unit area of between 1 500 g/m.sup.2 and 18 000 g/m.sup.2. The weight per unit area of the plastic drain sheet is determined in accordance with DIN EN ISO 9864. The plastic drain sheet 1 has a low weight with respect to its dimensions and can thus be transported easily.

[0084] The transportability is increased further as a result of the first surface 5 being notched. The notches 12 run parallel to one another in the transverse direction 4. The notches 12 run parallel to the mating grooves 8. The notches 12 are incisions in the main body 2.

[0085] The notches 12 have a depth d.sub.3 perpendicular to the sheet plane that is less than the sheet thickness d minus the depth d.sub.2 of the mating grooves 8: d−d.sub.2>d.sub.3. The notching of the main body 2 with the aid of the notches 12 improves the rolling up of the plastic drain sheet onto transport rolls.

[0086] The plastic drain sheet 1 can be used in its form shown in FIGS. 1 to 3. In addition, the plastic drain sheet 1 can be supplemented by cover layers on the surfaces 5, 6. Suitable cover layers are geotextiles, in particular composed of PP nonwoven materials, which are thermally bonded to the plastic drain sheet 1.

[0087] The manufacture of the plastic drain sheet 1 will be explained below with reference to FIGS. 4 to 6. FIG. 4 shows a schematic method sequence of a suitable manufacturing method 13. The manufacturing method 13 is divided into functional manufacturing steps. The individual manufacturing steps thus do not constitute a strictly chronological sequence. Rather, the sequence of the manufacturing steps over time is determined by the manufacturing apparatus used for carrying out the manufacturing method 13.

[0088] FIG. 5 schematically shows an exemplary embodiment of a manufacturing apparatus 14 which can be used for carrying out the manufacturing method 13. The manufacturing apparatus 14 substantially comprises a slit die extruder 15 and two smoothing calenders 17, 18 which follow one another in the machine direction 16.

[0089] In a preparing step 19, the sheet-like main body 2 is extruded using the slit die extruder 15. The width B of the main body 2 and therefore of the plastic drain sheet 1 is thus established by the width of the slit die extruder 15. The main body 2 and the plastic drain sheet 1 can be created in any desired length, in particular can be created continuously, using the slit die extruder 15. The slit die extruder 15 thus also predefines the longitudinal direction 3, which corresponds to the machine direction 16, and the transverse direction 4 of the plastic drain sheet 1. Using the slit die extruder 15, all of the materials which can be used as stated above for the main body 2 can be processed individually or in combination in the co-extrusion method.

[0090] In the preparing step 19, the sheet-like main body 2 is extruded with a base sheet thickness.

[0091] In a groove forming-in step 20, the grooves 7 are formed into the first surface 5 of the main body 2. For this purpose, the first smoothing calender 17 has a groove embossing roll 21 with grooving tools 22 adapted to the cross section Q of the grooves 7. The grooves 7 are embossed into the main body 2 using the grooving tools 22 of the groove embossing roll 21. The grooving tools 22 have a mean surface roughness which corresponds to the mean surface roughness of the edge faces of the grooves 7.

[0092] In a mating-groove forming-in step 23, the mating grooves 8 are formed into the second surface 6 of the main body 2. In the manufacturing apparatus 14, this takes place using a mating-groove embossing roll 24 of the second smoothing calender 18. The mating-groove embossing roll 24 has mating-grooving tools 25, the cross section of which corresponds to the cross section Q of the mating grooves 8. The mating-grooving tools 25 have a mean surface roughness which corresponds to the mean surface roughness of the mating grooves 8.

[0093] During the embossing of the grooves 7 and the mating grooves 8 in the groove forming-in step 20 and in the mating-groove forming-in step 23, respectively, the material of the main body 2 that was originally located in the region of the grooves 7 and mating grooves 8, respectively, is displaced. On account of this material displacement, the thickness of the main body 2 is increased over the base sheet thickness with which the main body 2 was extruded in the preparing step 19. After the grooves 7 and the mating grooves 8 have been embossed, the main body 2 has the sheet thickness d, as was described above with reference to FIGS. 1 to 3.

[0094] The microprofiling 11 is created in a profiling step 26. In the manufacturing apparatus 14, the profiling step is carried out using profile embossing rolls 27. For this purpose, the profile embossing rolls 27 have a surface profiling 28 which corresponds to the microprofiling 11. The microprofiling 11 of the second surface 6 is created using the profile embossing roll 27, which is part of the first smoothing calender 17. The microprofiling 11 of the first surface 5 is created using the profile embossing roll 27, which is part of the second smoothing calender 18.

[0095] The groove forming-in step 20, the mating-groove forming-in step 23 and the profiling step 26 are carried out as long as the material forming the main body 2 is still warm and correspondingly moldable. The further manufacturing steps can also be carried out after the material has been cooled down.

[0096] For the case in which the through-openings 10 are not formed solely by virtue of the embossing of the grooves 7 and the mating grooves 8, respectively, in the groove forming-in step 20 and the mating-groove forming-in step 23, the manufacturing method 13 can comprise an optional perforating step 29. Material residues remaining in the region of the crossing points 9 can then be severed and/or removed in the perforating step 29. This can take place for example mechanically by means of making holes or piercing, or pneumatically with compressed air. As an alternative, the through-openings 10 can also be introduced hydraulically by means of water blasting. A correspondingly designed perforating apparatus 30 adjoins the smoothing calenders 17, 18 in the machine direction 16 in the manufacturing apparatus 14.

[0097] In a notching step 31, the first surface 5 of the main body 2 is notched. The notches 12 are introduced using the notching apparatus 32. As an alternative to providing an extra notching apparatus 32, corresponding notching tools can also be provided at the profile embossing rolls 27.

[0098] An optional supplementing step 33 follows the abovementioned manufacturing steps. In the supplementing step 33, cover layers, for example in the form of PP nonwoven materials, can be applied to the surfaces 5, 6 of the main body 2. A laminating apparatus which can be used for the supplementing step 33 is not shown in the case of the manufacturing apparatus 14 for the sake of clarity.

[0099] In addition to the manufacturing apparatus 14, further manufacturing apparatuses for carrying out the manufacturing method 13 can also be used. In further exemplary embodiments, not illustrated, of a manufacturing apparatus for the plastic drain sheet 1, the embossing rolls can be arranged differently. By way of example, it is possible to combine the groove embossing rolls and the mating-groove embossing rolls in a first smoothing calender. The two profile embossing rolls can then be positioned one on top of the other in a second, downstream smoothing calender. In yet other exemplary embodiments, not illustrated, the groove embossing rolls and the mating-groove embossing rolls comprise in each case a surface profiling between the respective (mating-)grooving tools. These groove embossing rolls and the mating groove embossing rolls are in this case combined into a single smoothing calender, which ensures the embossing of the grooves 7, the mating grooves 8 and the microprofiling 11. A second smoothing calender is correspondingly not necessary.

[0100] FIG. 6 shows a further exemplary embodiment of a manufacturing apparatus 14a for manufacturing the plastic drain sheet 1. Components which have already been described in conjunction with the manufacturing apparatus 14 according to FIG. 5 bear the same reference signs. Structurally different but functionally similar parts are given the same reference signs with an appended a.

[0101] In the illustration of the manufacturing apparatus 14a, the first surface 5 of the plastic drain sheet 1 to be manufactured points upward, whereas the second surface 6 faces downward. The manufacturing apparatus 14a has a slit die extruder 15a. The slit die extruder 15a has an extruder slot 34 with projections 35. The form of the individual projections 35 corresponds to the cross section Q of the grooves 7 in the first surface 5. During the extrusion of the main body 2 using the slit die extruder 15a, the grooves 7 are formed into the first surface 5 of the main body 2. In this context, the groove forming-in step 20 takes place simultaneously with the preparing step 19. Subsequent embossing of the grooves 7 in the main body 2 is not necessary. The manufacturing apparatus 14a accordingly does not have a first smoothing calender 17.

[0102] The single smoothing calender 18a of the manufacturing apparatus 14a has a profile embossing roll 27 and a mating-groove embossing roll 24a. The microprofiling 11 is created on the first surface 5 in regions between the grooves 7 using the profile embossing roll 27. The mating-groove embossing roll 24a comprises the mating-grooving tools 25, by means of which the mating grooves 8 are embossed into the second surface 6 of the main body 2. Between the mating-grooving tools 25, the mating-groove embossing roll 24a has a surface profiling 28, with the aid of which the microprofiling 11 is created on the second surface 6 in regions between the mating grooves 8.

[0103] Further components of the manufacturing apparatus 14a, such as for example a perforating apparatus or a notching apparatus, are similar to the corresponding components of the manufacturing apparatus 14. These components and an optionally provided laminating apparatus are not shown in FIG. 6 for the sake of clarity.

[0104] The manufacturing method 13 described here makes it possible to manufacture the plastic drain sheet 1 in a defined and uniform quality. In addition, the properties of the plastic drain sheet 1 can be adapted flexibly to the respective requirements. By way of example, the materials used can be varied. The cross section Q, the depths d.sub.1, d.sub.2 and the spacings B.sub.2, L.sub.2 between the grooves 7 and/or the mating grooves 8 can similarly be selected freely.

[0105] In the manufacturing method 13 described above, the width B of the plastic drain sheet 1 corresponds substantially to the width with which the main body 2 is extruded. In further embodiments of the method, it is however also possible to change the width B of the plastic drain sheet 1 in a targeted manner. In an exemplary embodiment of the manufacturing method, the extruded main body 2 can be be gripped at its longitudinal edges running in the longitudinal direction 3 and be drawn out widthwise in the transverse direction 4. As a result, the width B of the main body 2 and thus of the plastic drain sheet 1 can be increased. The plastic drain sheet 1 can in particular have a width B which exceeds the width of the slit die extruder used to extrude the main body 2.

[0106] In a further exemplary embodiment of the manufacturing method, the plastic drain sheet 1 is stretched in the machine direction 16, i.e. in the longitudinal direction 3. This can take place, for example, in that a smoothing calender downstream of the extruder has a drawing-off speed which is elevated with respect to the conveying speed of the main body. The drawing-off speed is determined by the speed at which the surface and/or the embossing tools of the embossing rolls of the smoothing calender move along the circumference of the embossing roll. The conveying speed corresponds to the extrusion speed at which the main body 2 is extruded. The elevated drawing-off speed leads to the plastic drain sheet 1 being stretched in the machine direction 16. As a result, the width B of the plastic drain sheet 1 is reduced in favor of its length.

[0107] Further exemplary embodiments for manufacturing methods for manufacturing the plastic drain sheet 1 differ in terms of the methods by which the mating grooves 8 are introduced into the second surface 6. In an exemplary embodiment, firstly the grooves 7 are embossed into the first surface 5 with a depth di. After this, the second surface 6 is notched. The notching runs preferably in the transverse direction 4. The notching has a depth d.sub.2, which corresponds to at least the difference between the sheet thickness d and the depth di of the grooves 7: d.sub.2≥d−d.sub.1. After the notches have been introduced, the main body 2 is stretched in the machine direction 16, i.e. in the longitudinal direction 3. The stretching takes place in turn as a result of an elevated drawing-off speed of a downstream smoothing calender. As a result of the stretching, the notches are opened and form the mating grooves 8. At the same time, the through-openings 10 between the grooves 7 and the mating grooves 8 are opened.

[0108] FIG. 7 shows alternative cross-sectional forms for the grooves 7. Apart from the grooves 7 with a rectangular cross section Q, as have already been discussed above, grooves with a rectangular cross section Q.sub.3 with corner stiffening pieces, called haunches, can also be provided. Further possible cross sections have a tunnel form (Q.sub.2), a flat trapezoidal form (Q.sub.4), a steep trapezoidal form (Q.sub.5) or an undercut trapezoidal form (Q.sub.6). Corresponding cross-sectional forms can of course also be provided for the mating grooves 8.

[0109] As is also clear from FIG. 7, notches 36 which run in the longitudinal direction 3 can also be provided on the second surface 6. The depth d.sub.4 of the notches 36 is smaller than the sheet thickness d minus the depth di of the grooves 7: d−d.sub.1>d.sub.4.

[0110] In other exemplary embodiments, not illustrated, the grooves 7 and the mating grooves 8 have a changed arrangement. By way of example, it is possible for the mating grooves 8 to run not perpendicular to the longitudinal direction 3, that is to say in the transverse direction 4, but oblique thereto. In general, the grooves 7 and the mating grooves 8 can enclose an angle of between 20° and 160°.

[0111] In further exemplary embodiments, the sum of the depth di of the grooves 7 and the depth d.sub.2 of the mating grooves 8 does not correspond equally to the sheet thickness d. In general, the depths d.sub.1, d.sub.2 can each be between 10% and 90% of the sheet thickness d. For the case in which the sum of the depths d.sub.1 and d.sub.2 is less than the sheet thickness d, the through-openings 10 in the region of the crossing points 9 necessarily have to be introduced by means of the perforating step 29, for example by using a mandrel to pierce remaining material.

[0112] FIG. 8 shows a cross section through a further exemplary embodiment of a plastic drain sheet 100. Components which have already been explained in conjunction with the plastic drain sheet 1 according to FIGS. 1 to 7 bear the same reference signs.

[0113] The plastic drain sheet 100 differs from the plastic drain sheet 1 in that reinforcing structures 37 are embedded into its main body 2 between the grooves 7 running in the longitudinal direction 3. The reinforcing structures 37 are embedded into the main body 2 of the plastic drain sheet 100 around the full periphery. The reinforcing structures 37 extend in the longitudinal direction 3 over the entire length of the plastic drain sheet 100. As a result, a uniaxial reinforcement of the plastic drain sheet 100 is realized. The plastic drain sheet 100 can take up considerable forces in the longitudinal direction 3. As a result, the functionality and possible uses of the plastic drain sheet 100 are increased. The plastic drain sheet 100 can be used as reinforcement, without additional external reinforcing elements, such as for example geogrids, being necessary for this purpose.

[0114] The reinforcing structures 37 comprise plastic yarns in the form of multifilament yarns consisting of polyethylene terephthalate (PET) and/or polyvinyl alcohol (PVAL). In other exemplary embodiments, the reinforcing structures 37 comprise yarns composed of glass fibers, basalt fibers and/or steel fibers.

[0115] In further exemplary embodiments of the plastic drain sheet 100, a plurality of reinforcing structures 37 are embedded between in each case two longitudinal grooves 7.

[0116] The reinforcing structures 37 of the plastic drain sheet 100 can be introduced into the main body 2 in the manufacturing method described above. For this purpose, continuous yarns of the material forming the reinforcing structure 37 are provided and are inserted and embedded into the molding compound of the main body 2 when the main body 2 is being extruded in the preparing step 19.