Distributor head for producing a tubular profiled part from at least two flows of thermoplastic material

Abstract

The invention relates to a distributor head (1) for producing a tubular profiled part, which has a central axis (M), from at least two flows of thermoplastic material, comprising at least two flow channel systems (30, 32, 34), wherein each flow channel system (30, 32, 34) extends between an inlet (10, 12, 14) and an outlet (20, 22, 24) with a tubular cross-section; the first flow channel system (30) generates an outer wall of the tubular profiled part; the second flow channel system (32) generates an inner wall of the tubular profiled part; each first flow channel system (30) comprises an inlet flow channel (36) that is connected to the inlet (10) and is divided into intermediate flow channels (60, 60.1, 60.2) in a number of at least two branching stages, comprising corresponding branches (50, 50.1, 50.2, 50.3), which follow one another in the axial direction of the distributor head, divide the last intermediate flow channels (60, 60.2) into outlet flow channels (66, 66.1, 66.2) that open onto the circumference around an outlet central line of the corresponding outlet (20), and are connected to a fan-shaped opening (72) that opens into the corresponding outlet (20); and each second flow channel system (32) comprises an inlet flow channel (38) that is connected to the inlet (12) and is divided, at a division point (52), into at least four outlet flow channels (68), which open onto the circumference around an outlet central line of the corresponding outlet (22) and are connected to a fan-shaped opening (74) that opens into the associated outlet (22).

Description

[0001] 77829-WO-KME / KF-KF March 19, 2026

[0002] Description

[0003] Distributor head for the production of a pipe profile from at least two streams of a thermoplastic material

[0004] The invention relates to a distributor head for producing a pipe profile, having a central axis, with at least a two-layer wall made of at least two streams of a, preferably extruded, thermoplastic plastic or plastic material according to the preamble of claim 1.

[0005] The prior art includes many devices or distributor heads designed for the extrusion of a multi-walled tube, or in particular for nozzles that serve to direct the output of several extruders into a format that solidifies into a multi-walled tube. For example, DE 693 12 074 T2 discloses a distributor head for forming a tubular profile from one or more streams of extruded thermoplastic material. DE 693 12 074 T2 discloses a distributor head having one or more inlet channels for connection to one or more extruders, these channels dividing several times before opening into three concentric circular outlet channels on the opposite side of the distributor head.The use of three extruders is further disclosed, including a first extruder that provides thermoplastic material forming the outer wall of a tube, a second extruder that provides thermoplastic material to form the middle or foam core wall of a tube, and a third extruder that provides thermoplastic material forming the outer wall of a tube. These extruders feed a die or distributor head that extrudes the thermoplastic material into concentric cylindrical walls, which are then cooled in a cooling device, with the finished three-layer tube exiting the cooling device's outlet. 77829-WO-KME / KF-KF 19.03.2026.

[0006] The distributor head of DE 693 12 074 T2 comprises at least two flow channel systems, each for a separate flow of the respective thermoplastic material. Each flow channel system extends between an inlet opening, which can be connected to an extruder, and an outlet opening with a tubular, in particular annular, oval / oval, elliptical / ellipsoidal, or oblong cross-section. Thus, at least a first and a second flow channel system are provided. The first flow channel system is designed, configured, and / or arranged to create an outer wall of the tubular profile. The second flow channel system is designed, configured, and / or arranged to create an inner wall of the tubular profile.Furthermore, the first and second flow channel systems each comprise an inlet flow channel connected to the respective inlet opening, which inlet flow channel is subdivided into intermediate flow channels in a number of at least two branching stages with associated branches, which branching stages follow one another in the axial direction, in particular according to the central axis, of the distributor head, the last intermediate flow channels are subdivided, in particular each, into outlet flow channels which open on a circumference around an outlet centerline of the associated outlet opening, and each outlet flow channel is connected to a fan-shaped opening that opens into the associated outlet opening.

[0007] One objective of the invention is to provide a device for increasing the output performance and production efficiency of a multi-extruder system for the production of multi-walled pipe profiles.

[0008] A further objective of the present invention is to further develop a device of the type mentioned above in such a way that pipe profiles made of different materials can be extruded, in order to process particularly cost-effective materials, such as recycled materials. It should be ensured that the material to be extruded is of the required quality. 77829-WO-KME / KF-KF 19.03.2026

[0009] The material should flow through the distributor head and distribute itself evenly to create a wall or walls with a consistently uniform thickness. The residence time of the material in the distributor head should also be optimized.

[0010] Furthermore, the manufacturing of a distributor head should be made easier and improved, and the residence time of the material in the distributor head should be optimized, thereby or (additionally) keeping the thermal stress on the material as low as possible.

[0011] Likewise, simplified cleaning of the distributor head should be made possible, especially in the flow channel system for the inner or middle layer or wall of the pipe profile, since recycled material is often used here, which causes increased or high levels of contamination.

[0012] Another objective of this invention is to be able to process plastic materials with different viscosities in the individual walls / layers and to continue producing a pipe profile with constant wall thicknesses and quality requirements even when viscosities change in a processing batch.

[0013] According to the invention, the problems are solved by the features of claim 1. Advantageous embodiments and / or further developments are the subject of the dependent claims, the description and / or the accompanying figures.

[0014] The distributor head according to the invention comprises at least two, preferably exactly three, flow channel systems, each for a flow of the respective thermoplastic polymer or plastic material, wherein each flow channel system extends between an inlet opening, in particular an inlet opening which can be connected to an extruder, and an outlet opening with a tubular, in particular annular, oval / oval, elliptical / ellipsoidal, or oblong cross-section. Oblong-shaped here refers to an elongated hole or an oblong hole shape with rounded corners. 77829-WO-KME / KF-KF 19.03.2026

[0015] According to the invention, at least one first and one second flow channel system are provided, preferably a third flow channel system. The first flow channel system with associated outlet opening and optionally with a subsequent ring / annular channel is designed, configured, and / or arranged to create an outer wall of the pipe profile. The second flow channel system with associated outlet opening and optionally with a subsequent ring / annular channel is designed, configured, and / or arranged to create an inner wall of the pipe profile. The preferably third flow channel system with associated outlet opening and optionally with a subsequent ring / annular channel is designed, configured, and / or arranged to create an inner wall of the pipe profile.Furthermore, the first flow channel system comprises an inlet flow channel connected to, in particular, the respective inlet opening. This inlet flow channel is subdivided into intermediate flow channels in a number of at least two branching stages with associated branches. These branching stages follow one another in the axial direction, in particular along the central axis, of the distributor head. The last intermediate flow channels are subdivided, in particular, into outlet flow channels, which open around a circumference of the associated outlet centerline. Each outlet flow channel is connected to a fan-shaped opening that opens into the associated outlet opening. The third flow channel system, preferably, is designed and / or constructed identically to the first flow channel system.

[0016] According to the invention, the second flow channel system comprises an inlet flow channel connected to the inlet opening, which inlet flow channel divides into at least four outlet flow channels at a distribution point, which open on a circumference around the outlet centerline of the associated outlet opening and each 77829-WO-KME / KF-KF 19.03.2026

[0017] The outlet flow channel is connected to a fan-shaped opening that leads into the corresponding outlet opening. The distribution can be divided into four, or preferably 32, outlet flow channels. Particularly preferably, the number of outlet flow channels in the second flow channel system corresponds to the number of outlet flow channels in the first flow channel system. If there are optionally additional flow channel systems, such as preferably a third flow channel system, the number of outlet flow channels in this additional, preferably third, flow channel system corresponds to the number of outlet flow channels in the first and second flow channel systems. Preferably, the number is eight. This depends on the size of the pipe profile.For small pipe profiles, a branching arrangement (A) to four outlet flow channels with corresponding fan-shaped openings may be sufficient to ensure good and even distribution of the plastic onto the outlet opening with a tubular cross-section. However, for large pipe profiles, sixteen or even 32 outlet flow channels with fan-shaped openings might be necessary.

[0018] It would also be conceivable for the first, second, and / or each subsequent flow channel system to have a different number of outlet flow channels. This would be possible if the respective walls have correspondingly different diameters / circumferences, so that the inner and / or internal wall, and / or each subsequent possible wall, already allows for sufficient distribution of the plastic with a lower or higher number of fan-shaped openings. Advantageously, the third flow channel system could have four openings, and / or the second flow channel system could have four, six, or eight openings, and / or the first flow channel system could have eight or sixteen openings.

[0019] The distributor head can have a diameter of 110 to 250 mm. The first and second, and optionally the third, flow channel systems can have eight outlets (and therefore eight outlet flow channel systems). The distributor head can have a diameter of 50 to 90 mm. 77829-WO-KME / KF-KF 19.03.2026

[0020] The first flow channel system can have eight inlets (and therefore also eight outlet flow channels), the second flow channel system can have four, five, or six inlets (and therefore also four, five, or six outlet flow channels), and optionally the third flow channel system can have four inlets (and therefore also four outlet flow channels). The distributor head can have a diameter of 315 to 630 mm, preferably 315 to 500 mm. The first flow channel system can have 16 or 32 inlets (and therefore also 16 or 32 outlet flow channels), the second flow channel system can have 16 inlets (and therefore also 16 outlet flow channels), and optionally the third flow channel system can have 16 inlets (and therefore also 16 outlet flow channels).

[0021] The distributor head can preferably be a pipe profile with a three-layer wall made of three streams of a thermoplastic material or...To produce plastic material, the distributor head can include a third flow channel system with an associated outlet opening, which is designed and / or configured to create an inner wall of the pipe profile, and wherein the third flow channel system comprises an inlet flow channel connected to the associated inlet opening, which inlet flow channel is subdivided into intermediate flow channels in a number of at least two branching stages with associated branches, which branching stages follow one another in the axial direction of the distributor head, the last intermediate flow channels being subdivided by a branch, in particular an outlet flow branch, into outlet flow channels, which open on a circumference around an outlet centerline of the associated outlet opening, and each outlet flow channel is connected to a fan-shaped opening that opens into the associated outlet opening.

[0022] Since the branching stages follow one another in the axial direction, the respective branches can also follow one another in the axial direction, with the respective flow channels arranged accordingly between them. 77829-WO-KME / KF-KF 19.03.2026

[0023] In the case of the three-layer walled pipe profile, the inner wall of the second flow channel system forms an intermediate wall within the pipe profile. The respective outlet openings are therefore designed, arranged, and / or configured such that the inner wall forms an intermediate wall within the pipe profile, located between the outer and inner walls.

[0024] When manufacturing a pipe profile with a four-layer or more multi-layered wall, correspondingly additional fourth, fifth, etc. flow channel systems with respective inlet / outlet openings are included. These can be designed according to the first and / or third flow channel system with their respective inlet / outlet openings.

[0025] Due to the design of the outlet opening with a tubular, in particular ring-shaped, oval / oval-shaped, elliptical / ellipsoidal, or oblong cross-section, the pipe profile also has this tubular, in particular ring-shaped, oval / oval-shaped, elliptical / ellipsoidal, or oblong cross-section.

[0026] The respective outlet openings can be designed to be nested within each other, and / or the centerlines or axes of the respective outlet openings can form an identical centerline or axis, as well as an identical centerline / axis with the centerline of the pipe profile. The respective centerlines and / or axes of the outlet openings and the pipe profile / distributor head can lie on or be the same (center)line or axis. The outlet openings can be concentric and / or coaxial. The centerline of the pipe profile can correspond to or be the centerline of the distributor head.

[0027] The outlet opening, connected to the second flow channel system for generating the inner wall, in conjunction with the outlet opening, 77829-WO-KME / KF-KF 19.03.2026

[0028] The inner wall, connected to the first flow channel system for generating the outer wall, can be designed, configured, and / or arranged such that the inner wall is located within the outer wall and preferably directly abuts, rests against, and / or is connected to it. The outlet opening for the inner wall, viewed radially along the pipe profile, can be located closer to the common central axis or centerline than the outlet opening for the outer wall. The outlet opening for the inner wall can have a smaller radius or circumference than the outlet opening for the outer wall.

[0029] If the distributor head includes an optional third flow channel system and thus an associated (third) outlet opening for generating an inner wall, this outlet opening, in conjunction with the outlet opening connected to the second flow channel system for generating the inner wall, can be designed, configured, and / or arranged such that the inner wall is located within the inner wall and preferably directly abuts, rests against, and / or is connected to it. The outlet opening for the inner wall, viewed radially along the pipe profile, can be located and / or positioned closer to the common central axis or centerline than the outlet opening for the inner wall. The outlet opening for the inner wall can have a larger radius or circumference than the outlet opening for the inner wall.

[0030] The thermoplastic material can be PVC. This can be new, contaminated (PVC) material, as well as recycled material and / or combinations thereof. The second flow channel system with connected inlet and outlet openings is particularly preferably configured, designed, and / or designed to guide or process contaminated, recycled, or recycled PVC material, especially PVC foam. The first and optional third flow channel systems with (associated / respective) inlet and outlet openings can be configured, designed, and / or designed as follows: 77829-WO-KME / KF-KF 19.03.2026

[0031] to carry and / or process new or pure PVC material, in particular solid PVC material or PVC-U (hard PVC / unplasticized PVC).

[0032] The inlet opening of the first and / or third flow channel system can be arranged at an angle to the outlet centerline of the (associated) outlet opening. The inlet opening of the second flow channel system can be arranged coaxially to the center axis of the pipe profile or distributor head.

[0033] The branches can be designed such that the respective flow channel (inlet flow channel and / or intermediate flow channel) divides directly into the subsequent flow channels (intermediate flow channels or outlet flow channels), or that the branch initially comprises a preferably short, straight branch channel (section) which has a central axis running parallel to the central axis of the pipe profile / distributor head, and which is divided accordingly at its end, or to which the subsequent flow channels connect. The branch channel (section) can have a length of 0.5 to ten times, preferably 0.5 to eight times, more preferably one to six times, particularly preferably 1.5 to five times, and most preferably two to five times the diameter of the respective branch channel (section).

[0034] The central axes of the flow channels following the branch can diverge from the central axis of the respective branch at the same angle or exhibit the same angle. Preferably, at each branch, the smallest angle formed by the flow channel upstream of the branch and a flow channel downstream of the branch (or their respective central axes) can be greater than 90°. This ensures, particularly when processing sensitive plastic materials, that the material does not flow at too acute an angle and that the flow velocity does not differ too greatly locally. 77829-WO-KME / KF-KF 19.03.2026

[0035] Each branching stage has a branch, wherein each branch can divide the preceding flow channel into two or more, preferably exactly two, subsequent flow channels. The inlet flow channel of the respective flow channel system is thus divided into two or more, preferably exactly two, respective intermediate flow channels, and the respective last intermediate flow channel is further divided into two or more, preferably exactly two, outlet flow channels. According to the invention, at least four outlet flow channels are thus provided. Preferably, three branching stages and thus three branches can be present. In this case, the respective intermediate flow channel is divided into two or more, preferably exactly two, second intermediate flow channels.The system is subdivided into four second intermediate flow channels, each of which is further subdivided into two or more, preferably exactly two, outlet flow channels, resulting in eight outlet flow channels. Alternatively, a further branching stage could be arranged, in which case there would be eight third intermediate flow channels and 16 outlet flow channels.

[0036] Particularly preferred are three branching stages, each branching into exactly two subsequent flow channels. The (last) branching, which divides the flow into the outlet flow channels, can also be referred to as the outlet flow branching.

[0037] The inlet flow channel of the first and / or third flow channel system can be divided / subdivided at a first branch into at least two first intermediate flow channels, wherein each first intermediate flow channel can be divided / subdivided at a second branch into at least two second intermediate flow channels, and furthermore, each second intermediate flow channel can be divided at a third branch, the 77829-WO-KME / KF-KF 19.03.2026

[0038] Exhaust flow branching, into which exhaust flow channels can branch or be subdivided / divided.

[0039] The branching stages, and thus the branches themselves, follow one another in the axial direction of the distributor head, meaning that the branches are not arranged sequentially in a radial direction. "In the axial direction" refers to the flow direction, i.e., from the inlet openings towards the (respective / associated) outlet openings. Therefore, one or the second branch follows one or the first branch, and possibly one or the third branch follows one or the second branch in the axial direction.

[0040] The respective outlet flow channels of a flow channel system can essentially end at the same mutual distance and / or be arranged in a circle, oval or in a slotted shape around the center line of the distributor head / pipe profile.

[0041] Each outlet flow channel is connected to or opens into a respective fan-shaped opening, whereby the respective fan-shaped openings can abut each other with their outlet ends, so that they open into the (associated) outlet opening with a tubular cross-section.

[0042] Each flow channel system divides the plastic material flow entering through the respective inlet opening into at least four branch flows, which can be evenly distributed around the circumference of a circle, oval or elongated hole, and are combined by appropriate arrangement of the outlet flow channels and / or fan-shaped openings and at the end of the respective fan-shaped openings to form a plastic material flow of tubular, in particular ring-shaped, oval or elongated cross-section.

[0043] Each outlet flow channel can have at least one kink, such that a channel section of the outlet flow channel after the at least one 77829-WO-KME / KF-KF 19.03.2026

[0044] A kink is formed, which is connected to the fan-shaped outlet, wherein a central axis of the channel section of the outlet flow channel runs completely in a plane through which the central axis of the pipe profile or distributor head also runs. Accordingly, the channel section can run obliquely outwards with respect to the central axis; however, if the channel section is viewed as lying directly above the central axis, a parallel course would be visible / recognizable, since the oblique course in this view is in / out of the plane of the sheet. Preferably, the channel section of the outlet flow channel can run parallel to the central axis of the pipe profile or distributor head.

[0045] The (respective) channel section of the outlet flow channel can have a length that corresponds (at most) to one to eight times, preferably to one to six times, particularly preferably to 1.5 times, and most preferably to two to 4.5 times the diameter of the respective outlet flow channel. An average diameter of the outlet flow channel and an average length or the length of a central axis of the channel section can be used for this calculation. The respective outlet flow channel and / or any bend present can have a constant diameter.The channel section of the outlet flow channel of the first flow channel system can be shorter than the channel section of the outlet flow channel of the second flow channel system (formed) and / or the channel section of the outlet flow channel of the third flow channel system can be shorter than the channel section of the outlet flow channel of the second flow channel system (formed).

[0046] The exhaust flow channel can otherwise have a straight course and thus only exactly one bend. The exhaust flow channel can have several bends, with the bend that transitions into the channel section of the exhaust flow channel being the last bend. A bend can also be a curve or be formed as a curve. Accordingly, after the last bend (in the case of only one bend, the last bend is also the first / only bend), a respective channel section of the respective exhaust flow channel can be formed. 77829-WO-KME / KF-KF 19.03.2026

[0047] which is connected to or extends into the respective fan-shaped opening.

[0048] The fan-shaped outlets can have a classic fan shape, thus resembling an (expanded) fan. However, the fan-shaped outlets can also be designed in such a way that each outlet has an initially widening or fan-shaped section, followed by a straight or non-widening section, which in turn leads to a second widening or fan-shaped section. This second widening or fan-shaped section of the fan-shaped outlet then leads into the corresponding outlet opening. At least the fan-shaped outlets of the first flow channel system, or only the fan-shaped outlets of the first flow channel system, can exhibit this described configuration.All mouths can have this course, or, in addition to the mouths of the first flow channel system, the mouths of the second flow channel system can also have this course.

[0049] Each flow channel, i.e., each inlet flow channel, intermediate flow channel and outlet flow channel, in particular of the respective flow channel system, can have an essentially circular cross-section and / or each intermediate flow channel and / or inlet flow channel can run essentially straight.

[0050] The distributor head can have a number of bodies, each body being equipped with all the flow channels assigned to a branching stage. In this case, the bodies can be disc-shaped. With this design, it is also possible to use certain discs in more than one flow channel and for different pipe profiles. The flow channels can also be easily cleaned. In the last disc-shaped body, the fan-shaped outlets and the 77829-WO-KME / KF-KF 19.03.2026

[0051] The system may feature an outlet opening and / or outlet flow channels and / or outlet flow branches. The flow channels may be integrated into the disc-shaped bodies with associated branches / distributions, or the branches / distributions may be contained within separate disc-shaped bodies. Since the outlet flow channels and / or the inlet flow channel of the second flow channel system are longer than the flow channels of the first and, if applicable, third (and, in the case of multiple walls, also with respect to these walls) flow channel systems, the flow channels of the second flow channel system may extend through and / or be formed by multiple bodies. This is also applicable to the other flow channels, allowing them to extend through and / or be formed by multiple bodies.

[0052] In one embodiment, the bodies can be fixed in the distributor head by means of clamping rings engaging their outer circumference and / or a core extending through an axial bore in the bodies. The bodies can be bolted to the outside of the distributor head by means of a plurality of tie rods. Additionally or alternatively, a bolt or a plurality of tie rods, preferably bolted, can be pre-tensioned inside the distributor head. The pre-tensioning can also be hydraulic.

[0053] Rings or annular channels can be connected to the (respective) outlet openings, which may form annular channels in conjunction with a core of the device or the distributor head and / or the respective rings or annular channels that connect to the other outlet openings. Preferably, one ring or annular channel is connected to each outlet opening. The ring or annular channel can be integrally connected to or formed with the outlet opening. The respective annular channel can narrow or widen in the axial direction to form the at least two-walled pipe profile or pipe profile with at least two layers of wall. 77829-WO-KME / KF-KF 19.03.2026

[0054] All paths through the flow channels of the first and third flow channel systems, or those assigned to the first and third flow channel systems, can have essentially the same length between their respective inlet and outlet openings, and the change in cross-sectional area of ​​the flow channels of the first and third flow channel systems for all paths can be essentially identical. It can thus be ensured as far as possible that the plastic material flowing through the first and third flow channel systems has essentially the same resistance on each flow path and an identical residence time.

[0055] In the manifold head, the two or three (or more) walls of the respective flow channel system can already merge. This merging can occur at a single point or sequentially, or two or more walls can merge at one point, with one or more walls subsequently merging axially with this one or more walls to create a pipe profile. A nozzle can be connected to the manifold head to give the two-walled, optionally three- or more-walled, pipe profile its final shape, or to complete this process.

[0056] Furthermore, particular reference is made to Figures 1 and 2 and the accompanying description.

[0057] The term "may" refers in particular to optional features of the invention. Accordingly, there are also further developments and / or embodiments of the invention that additionally or alternatively include the respective feature(s). If necessary, isolated features can also be selected from the combinations of features disclosed herein and, by dissolving any structural and / or functional relationship that may exist between the features, used in combination with other features to define the scope of the claim. 77829-WO-KME / KF-KF 19.03.2026

[0058] Exemplary embodiments of the invention are described in more detail below with reference to the figures, which show schematically and by way of example:

[0059] Fig. 1 shows the shape of the flow channel system of the distributor head;

[0060] Fig. 2 shows another illustration with section A of the shape of the flow channel system of the distributor head;

[0061] Fig. 3 shows a production setup comprising two extruders and the distributor head.

[0062] Figure 1 shows the structure of the flow channel system 30, 32, 34 of the distributor head 1. In practice, however, these are bores / milled recesses / openings in disc-shaped bodies 1.1 through which the plastic(s) flow. Therefore, Figure 1 should not be interpreted as indicating that the system or distributor head 1 consists of different tubes. However, this possibility cannot be ruled out.

[0063] The embodiment according to Fig. 1 has three inlet openings 10, 12, 14, which can be connected to respective extruders 2, 3, 4. These extruders 2, 3, 4 are shown in Fig. 3, whereby extruder 4 is shown optionally in this configuration according to Fig. 3, so that a two-walled or three-walled tube profile can be produced with the production setup according to Fig. 3. A third extruder 4 is required for the distributor head 1 according to Fig. 1. The centerline of extruder 2 for forming the inner wall of the tube profile to be formed coincides with the center axis M of the distributor head 1, and consequently, so does the centerline of the second inlet opening 12. The centerlines of extruders 3, 4 for forming the inner and outer walls, respectively, are at an angle to the centerline of the distributor head, and consequently, so are the centerlines of the respective first inlet opening 10 and the third inlet opening 14.The first inlet opening 10 is the inlet opening 10 of or to the first flow channel system 30, the second inlet opening 12 is the inlet opening 12 of or to the second 77829-WO-KME / KF-KF 19.03.2026.

[0064] Flow channel system 32 and the third inlet opening 14 is the inlet opening 14 of or to the third flow channel system 34. Therefore, three flow channel systems 30, 32, 34 are present.

[0065] The first and third flow channel systems 30, 34 have a short inlet channel 36, 40, and the second flow channel system 32 has a long inlet channel 38, each connected to the respective first, second, or third inlet opening 10, 12, 14. Furthermore, each flow channel system 30, 32, 34 has a number of outlet flow channels 66, 68, 70, which open into an outlet opening 20, 22, 24 of annular cross-section via fan-shaped openings 72, 74, 76, the center line of which coincides with the central axis M of the distributor head 1. Fig. 2 shows the structure of the flow channel system of Fig. 1 in a similar orientation, with a section along line A of Fig. 1. Here, the outlet openings 20, 22, 24 from Fig. 1 are shown.

[0066] 2 to extract / recognize.

[0067] In the first and third flow channel systems 30, 34, the associated first and third inlet channels 36, 40 branch into three stages and, via intermediate flow channels 60, 64, into eight outlet flow channels 66, 70, which terminate at essentially the same intervals and are arranged in a circle around the center line of the distributor head 1. The outlet flow channels 66, 70 terminate in fan-shaped openings 72, 76, which are adjacent to one another at their outlet ends.

[0068] In the second flow channel system 32, the associated second inlet channel 38 branches directly into eight outlet flow channels 68, which terminate at essentially the same distance from each other and are arranged in a circle around the central axis M of the distributor head 1. The outlet flow channels 68 of the second flow channel system 32 terminate in fan-shaped openings 74, which abut each other at their outlet ends. 77829-WO-KME / KF-KF 19.03.2026

[0069] The first flow channel system 30 has a first branch 50.1, which connects directly to the first inlet flow channel 36 and divides it into two first intermediate flow channels 60.1. A second branch 50.2 connects directly to each of the two first intermediate flow channels 60.1, which in turn divides each first intermediate flow channel 60.1 into two second intermediate flow channels 60.2. A third branch 50.3, or outlet flow branch 50.3, connects to each second intermediate flow channel 60.2, which in turn divides each second intermediate flow channel 60.2 into two outlet flow channels 66, 66.1, 66.2. Each outlet flow channel 66, 66.1, 66.2 is connected to a fan-shaped opening 72 of the first flow channel system 30, which initially has a widening or fan-shaped course 72.1, to which a straight or non-widening section 72.2 is connected, to which in turn a second widening or fan-shaped section 72.3 is connected. The fan-shaped opening 72 or the second widening or fan-shaped section 72.3 opens into the associated outlet opening 20. The respective ends or outlet ends of the fan-shaped opening 72 and of the second widening or fan-shaped section 72.3 are adjacent to each other.

[0070] The third flow channel system 36 has a first branch 54.1, which connects directly to the third inlet flow channel 40 and divides it into two first intermediate flow channels 64.1. A second branch 54.2 connects directly to each of the two first intermediate flow channels 64.1, which in turn divides each first intermediate flow channel 64.1 into two second intermediate flow channels 64.2. A third branch 54.3, or outlet flow branch 54.3, connects to each second intermediate flow channel 64.2, which in turn divides each second intermediate flow channel 64.2 into two outlet flow channels 70, 70.1, 70.2. Each outlet flow channel 70, 70.1, 70.2 is connected to a fan-shaped opening 76 of the third flow channel system 36, which has a widening or fan-shaped 77829-WO-KME / KF-KF 19.03.2026

[0071] The course of the air flows into the associated outlet opening 24. The respective ends or exit ends of the fan-shaped opening 76 are adjacent to each other.

[0072] The second flow channel system 34 has only a distribution 52, which connects directly to the second inlet flow channel 38 and divides it into eight outlet flow channels 68, each of the eight outlet flow channels 68 being connected to a respective fan-shaped opening 74, which has a widening or fan-shaped course, and which opens into the associated outlet opening 22.

[0073] All fan-shaped openings 72, 74, 76 have a slightly curved shape, as this is the only way to allow them to flow into the corresponding outlet openings 20, 22, 24.

[0074] The outlet flow channels 66, 68, 70 each have a corresponding bend 100, 102, 104, such that a respective channel section 67, 69, 71 is connected to this respective bend 100, 102, 104, wherein this respective channel section 67, 69, 71 runs parallel to the central axis M and transitions into or is connected to the respective fan-shaped opening(s) 72, 74, 76.

[0075] Fig. 3 shows a production setup comprising two extruders 2, 3 and the distributor head 1, for manufacturing a double-walled pipe profile. Optionally, a third extruder 4 can be included to produce a triple-walled pipe profile. In the distributor head, the two or three (or more) walls of the respective flow channel system already merge. This is particularly evident in Fig. 1, as the flow paths narrow or converge at the right end (axially downstream / further along the flow path). This merging can occur at a single point or sequentially, or two or more walls can merge at a single point, with one or more walls merging axially downstream with this one or more walls. 77829-WO-KME / KF-KF 19.03.2026

[0076] The elements merge to create a pipe profile. A nozzle 5 connects to the distributor head 1 to give the two-walled, optionally three- or multi-walled, pipe profile its final shape, or to enable its final production. Downstream cooling systems and longitudinal cutting devices are not shown. 77829-WO-KME / KF-KF 19.03.2026

[0077] Reference symbol

[0078] 1 distributor head

[0079] 1.1 disc-shaped bodies

[0080] 2 first extruder

[0081] 3 second extruder

[0082] 4 third extruder

[0083] 5 nozzle

[0084] 10, 12, 14 Entrance openings; first, second, third entrance openings

[0085] 20, 22, 24 respective / associated outlet opening

[0086] 30 first flow channel systems

[0087] 32 second flow channel system

[0088] 34 third flow channel system

[0089] 36 Intake channel, first intake channel

[0090] 38 Intake channel, second intake channel

[0091] 40 Inlet channel, third inlet channel

[0092] 50 branches of the first flow channel system

[0093] 50.1, 50.2, 50.3 first, second, third branching of the first flow channel system 52 distribution

[0094] 54 branches of the third flow channel system

[0095] 54.1, 54.2, 54.3 first, second, third branch of the third flow channel system 60, 60.1, 60.2 intermediate flow channels, first, second intermediate flow channels of the first flow channel system

[0096] 64, 64.1, 64.2 Intermediate flow channels, first, second intermediate flow channels of the third flow channel system

[0097] 66, 66.1, 66.2 Outlet flow channels of the first flow channel system 67 Channel section of the first flow channel system

[0098] 68 Outlet flow channels of the second flow channel system 69 Channel section of the second flow channel system

[0099] 70, 70.1, 70.2 Outlet flow channels of the third flow channel system 71 Channel section of the second flow channel system

[0100] 72, 74, 76 fan-shaped outlets of the respective flow channel system 72.1 widening or fan-shaped course 77829-WO-KME / KF-KF 19.03.2026

[0101] 72.2 straight or non-widening course 72.3 second widening or fan-shaped course 100, 102, 104 kink

Claims

77829-WO-KME / KF-KF March 19, 2026 Claims 1. Distributor head (1) for producing a tubular profile, having a central axis (M), with a wall of at least two layers made of at least two streams of a thermoplastic material, which distributor head (1) comprises at least two flow channel systems (30, 32, 34) for each stream of the respective thermoplastic material, wherein each flow channel system (30, 32, 34) extends between an inlet opening (10, 12, 14), which can be connected to an extruder (2, 3, 4), and an outlet opening (20, 22, 24) with a tubular cross-section, wherein the first flow channel system (30) with associated outlet opening (20) is designed and / or configured to create an outer wall of the pipe profile; wherein the second flow channel system (32) with associated outlet opening (22) is designed and / or configured to create an inner wall of the pipe profile; wherein the first flow channel system (30) comprises an inlet flow channel (36) connected to the inlet opening (10), which inlet flow channel (36) is subdivided into intermediate flow channels (60, 60.1, 60.2) in a number of at least two branching stages with associated branches (50, 50.1, 50.2, 50.3), which branching stages follow one another in the axial direction of the distributor head, the last intermediate flow channels (60, 60.2) are subdivided into outlet flow channels (66, 66.1, 66.2) which open on a circumference around an outlet centerline of the associated outlet opening (20), and each outlet flow channel (66, 66.1, 66.2) is connected to a fan-shaped opening (72) which opens into the associated outlet opening (20), characterized by the fact that The second flow channel system (32) comprises an inlet flow channel (38) connected to the inlet opening (12), which inlet flow channel (38) is subdivided at a distribution (52) into at least four outlet flow channels (68) which open on a circumference around an outlet centerline of the associated outlet opening (22) and each outlet flow channel (68) is connected to a fan-shaped opening (74) which opens into the associated outlet opening. 77829-WO-KME / KF-KF 19.03.2026 (22) flows out.

2. Distributor head (1) according to claim 1 , characterized by the fact that Each outlet flow channel (66, 68, 70) has at least one bend (100, 102, 104) such that a channel section (67, 69, 71) of the outlet flow channel (66, 68, 70) is formed after the at least one bend (100, 102, 104) which is connected to the fan-shaped opening (72, 74, 76), wherein a central axis of the channel section (67, 69, 71) of the outlet flow channel (66, 68, 70) runs completely in a plane through which the central axis (M) of the pipe profile runs completely.

3. Distributor head (1) according to claim 2, characterized by the fact that the channel section (67, 69, 71) of the outlet flow channel (66, 68, 70) runs parallel to the central axis (M) of the pipe profile.

4. Distributor head (1) according to claim 2, characterized by the fact that the respective channel section (67, 69, 71) of the outlet flow channel (66, 68, 70) has a length of one to eight times, preferably 1.5 times to five times, the diameter of the respective outlet flow channel (66, 68, 70).

5. Distributor head (1) according to claim 2, characterized by the fact that the channel section (67) of the outlet flow channel (66) of the first flow channel system (30) is shorter than the channel section (69) of the outlet flow channel (68) of the second flow channel system (32).

6. Distributor head (1) according to at least one of the preceding claims, characterized in that at least the fan-shaped outlets (72) of the first flow channel system (30) have an initially widening course (72.1), to which a 77829-WO-KME / KF-KF 19.03.2026 a straight or non-widening course (72.2) is connected to which a second widening course (72.3) is connected.

7. Distributor head (1) according to at least one of the preceding claims, characterized in that a pipe profile with a three-layer wall made from three streams of a thermoplastic material, comprising a third flow channel system (34) with associated outlet opening (24) designed and / or configured to create an inner wall of the pipe profile; wherein the third flow channel system (34) comprises an inlet flow channel (40) connected to the inlet opening (14), which inlet flow channel (40) is subdivided into intermediate flow channels (64, 64.1, 64.2) in a number of at least two branching stages with associated branches (54, 54.1, 54.2, 54.3), which branching stages follow one another in the axial direction of the distributor head (1), the last intermediate flow channels (64, 64.2) being subdivided into outlet flow channels (70, 70.1, 70.2) which open on a circumference around an outlet centerline of the associated outlet opening (24), and each outlet flow channel (70, 70.1, 70.2) is connected to a fan-shaped opening (76) which opens into the associated outlet opening (24). ends.

8. Distributor head (1) according to at least one of the preceding claims, characterized in that Each branch (50, 54) divides the preceding flow channel (40, 60, 64) into exactly two respective subsequent flow channels (60, 64, 66, 70).

9. Distributor head (1) according to at least one of the preceding claims, characterized in that the inlet flow channel (36, 40) of the first and / or third flow channel system (30, 34) is subdivided at a first branch (50.1, 54.1) into at least two first intermediate flow channels (60.1, 64.1), wherein each first intermediate flow channel (60.1, 64.1) is subdivided at a second branch (50.2, 54.2) into at least two second intermediate flow channels (60.2, 64.2) and further 77829-WO-KME / KF-KF 19.03.2026 Every second intermediate flow channel (60.2, 64.2) is subdivided at a third branch (50.3, 54.3), in particular outlet flow branch (50.3, 54.3), into the outlet flow channels (66, 70).

10. Distributor head (1) according to at least one of the preceding claims, characterized in that Each flow channel (40, 60, 64, 70) of the flow channel system (30, 32, 34) has a substantially circular cross-section and / or each intermediate flow channel (60, 64) and inlet flow channel (40) is substantially straight.

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