Extrusion die head and extrusion system

Abstract

The invention relates to an extrusion die (100), in particular a pipe extrusion die, for producing hollow plastic profiles, in particular plastic pipes, comprising at least one melt channel (102), which extends between a melt inlet (104) and a melt outlet (106), as well as a nozzle and / or nozzle set, wherein the melt outlet (106) is designed in such a way that a plastic melt and / or a produced hollow plastic profile is transferred to the nozzle and / or the nozzle group. Wherein at least part of the melt channel (102) is mounted and / or movable in a substantially floating manner. The invention also relates to an extrusion system comprising at least one extruder and an extrusion die (100).

Description

Technical Field

[0001] The present invention relates to an extrusion die, in particular a tube extrusion die, such as a tube head. In addition, the present invention also relates to an extrusion system having such an extrusion die. Background Art

[0002] The extrusion die is usually arranged downstream of the extruder device, for example, directly downstream of the extruder device, so that the melt provided by the extruder device, in particular the plastic melt, can be given a desired shape by the downstream extrusion die. Here, flat nozzles, pipe dies, profiles, etc. are known as extrusion dies.

[0003] In the case of tube extrusion dies, also referred to simply as tube heads, it is known to heat the tube extrusion dies radially inside and / or outside the housing, thus well in front of the nozzle, using, for example, ceramic heating bands. In the case of large tube heads, in particular, the interior of the tube head is heated using a temperature control system that operates with a temperature control medium. This type of temperature control has the advantage of not only supplying heat to the melt but also dissipating it.

[0004] For example, DE 10 2010 025 524 A1 discloses a device for producing hollow plastic profiles, comprising an extrusion die with a melt channel, an extruder for feeding the melt channel with plastic melt, and a suction device for drawing air through the interior of the profile in a direction opposite to the extrusion direction. Internal cooling of the tube can be achieved by means of an air guidance system.

[0005] However, the known extrusion die designs for tube extrusion have several disadvantages when it comes to producing multi-layer plastic products that must be extruded from plastics with significantly different processing temperatures. The main disadvantage lies in the overall design of the extrusion die. In the known construction, the individual components are rigidly connected to one another and made of the same material. Consequently, it is not possible to ensure permanently distinct temperature zones within the extrusion die. Consequently, multi-layer plastic products extruded from plastics with significantly different processing temperatures cannot be produced, or can only be produced in a multi-stage process. It is well known that without thermal separation of the individual plastic melt channels / lines, there is a risk of plastic degradation and a risk of restricted formability of the plastic melt. Furthermore, due to different thermal expansion, there is a risk of damage to the extrusion die when the melt-conducting components are rigidly arranged relative to one another. Summary of the Invention

[0006] The present invention is directed to structurally and / or functionally improving the extrusion die mentioned in the introduction. Furthermore, the present invention is directed to structurally and / or functionally improving the extrusion system mentioned in the introduction. Therefore, the present invention aims to provide an extrusion die or an extrusion system, respectively, that reduces or eliminates the disadvantages associated with the prior art. In particular, the present invention aims to provide a pipe extrusion die that can process plastic melts of varying temperatures and avoids damage to the extrusion die or its components, particularly due to thermal expansion.

[0007] This problem is solved by an extrusion die having the features specified in claim 1. Furthermore, this problem is solved by an extrusion system having the features specified in claim 12. Advantageous embodiments and / or further developments are subject matter of the dependent claims.

[0008] One aspect relates to an extrusion die, particularly for producing hollow plastic profiles. The plastic profile can be a plastic tube, such as a multilayer tube. The extrusion die can be used and / or configured for use in an extrusion system. The extrusion die can be a tube extrusion die, such as a tube head. The tube extrusion die can be a multilayer tube head.

[0009] The extrusion die can include at least one melt channel. The at least one melt channel can also be designated as a melt line. The extrusion die can have multiple melt channels. The at least one melt channel can be configured to guide or respectively direct and / or receive the plastic melt. For example, the extrusion die can have exactly two melt channels or exactly three melt channels. The number of melt channels can correspond to the number of layers in the multi-layer profile or multi-layer tube to be produced. The at least one melt channel can extend at least partially in a straight line, a curved line, or a spiral shape, or can be configured in each case.

[0010] At least one melt channel may extend between a melt inlet and a melt outlet. The melt inlet may be configured to connect to an extruder, particularly an extruder outlet. The extrusion die may have multiple melt inlets. For example, the extrusion die may have exactly two melt inlets or exactly three melt inlets. The number of melt inlets may correspond to the number of layers in the multi-layer profile or multi-layer tube to be produced. A melt channel may be associated with each melt inlet. All melt channels may open into the melt outlet. The melt outlet may be configured so that the plastic melt and / or the produced plastic hollow profile can be distributed and / or transferred to a nozzle and / or nozzle assembly. The extrusion die may include a nozzle and / or nozzle assembly. The nozzle and / or nozzle assembly may be arranged at the melt outlet and / or fixed thereto. The nozzle and / or nozzle assembly may be replaceable. The nozzle and / or nozzle assembly may have a mandrel. The nozzle and / or nozzle assembly may be configured to configure and / or form specific or different profiles or corresponding tube sizes, such as tube diameters. The nozzle assembly may include a nozzle and a mandrel.

[0011] At least a portion of the at least one melt channel can be mounted essentially in a floating manner. Additionally or alternatively, at least a portion of the at least one melt channel can be configured in a movable manner, for example, movable to one side of the at least one melt channel and / or movable in the axial direction of the at least one melt channel and / or movable in the longitudinal direction of the at least one melt channel. The movability of the at least one melt channel can also be understood as the thermal expansion and / or stretchability of at least a portion of the at least one melt channel. Furthermore, movable can also be understood as contraction and / or shrinkage. The at least one melt channel can be mounted essentially directly or indirectly in a floating and / or movable manner, for example, in a movable manner. In particular, by means of a floating bearing and / or a movable bearing or by means of movability, the at least one melt channel can be configured to compensate for and / or realize expansions, in particular those caused by heat. At least one melt channel or at least a portion of at least one melt channel can be configured and / or mounted so that it can expand, contract and / or move in at least one direction, for example in the flow direction and / or extrusion direction and / or axial direction and / or longitudinal direction of the at least one melt channel, and / or in a direction opposite to the flow direction and / or extrusion direction and / or axial direction and / or longitudinal direction of the at least one melt channel.

[0012] The extrusion die can have at least one bearing. The at least one bearing can be configured to support at least one melt channel in a substantially floating manner and / or in a movable manner, for example as described above and / or below. The at least one bearing can be configured as a support bearing or a fixed-sliding bearing. The at least one bearing can be configured so that there is no or very little contact between components at different temperatures and / or these components can be movable relative to each other. The at least one bearing and / or the at least one melt channel can be configured to balance and / or achieve equilibrium of expansion and / or thermal expansion. The at least one bearing can have one or more, for example two, three, four or more bearing elements. The bearing elements of the at least one bearing, for example two bearing elements, can be arranged on opposite sides of the melt channel portion of the at least one melt channel. The bearing element or corresponding bearing element can be securely connected to the at least one melt channel.

[0013] At least one melt channel and / or at least one bearing may be at least partially made of a material having a low coefficient of thermal expansion. The coefficient of thermal expansion may also be referred to as the coefficient of expansion, such as the linear expansion coefficient, or the latter. The at least one melt channel and the at least one bearing may have different or the same coefficient of thermal expansion. For example, the coefficient of thermal expansion of the at least one melt channel may be less than or greater than the coefficient of thermal expansion of the at least one bearing. Additionally or alternatively, the at least one bearing and an adjacent portion of the extrusion die (e.g., a housing portion) may have different or the same coefficient of thermal expansion. For example, the coefficient of thermal expansion of the at least one bearing may be less than or greater than the coefficient of thermal expansion of an adjacent portion of the extrusion die (e.g., a housing portion). Additionally or alternatively, the at least one melt channel and an adjacent portion of the extrusion die (e.g., a housing portion) may have different coefficients of thermal expansion. For example, at least a portion of the at least one melt channel and an adjacent portion of the extrusion die (e.g., a housing portion) may have different coefficients of thermal expansion. For example, the coefficient of thermal expansion of the at least one melt channel may be less than or greater than the coefficient of thermal expansion of an adjacent portion of the extrusion die (e.g., a housing portion). The portion or housing part of the extrusion die can in particular be a structural element of the extrusion die which surrounds the bearing.

[0014] The coefficient of thermal expansion can be from about 0.5 to about 30 [10 -6 / K], for example, between about 10.5 and about 17 [10 -6 / K]. The thermal expansion coefficient should be selected to be as small as possible. For example, the thermal expansion coefficient can be equal to about 1.2[10 -6 / K], about 11.2[10 -6 / K], about 13.2[10 -6 / K] or about 17[10 -6 / K].

[0015] The at least one melt channel and / or the at least one bearing may be at least partially made of metal. The metal may be a metal alloy, such as steel, such as martensitic stainless steel, high-grade steel, nickel-containing iron-based alloy, or austenitic chromium-nickel-molybdenum stainless steel.

[0016] At least one melt channel and / or at least one bearing may be at least partially made of an elastically deformable material. At least one bearing and / or at least one melt channel may be flexible and / or bendable. At least one bearing may comprise or be configured as a thin metal sheet. At least one bearing may at least partially have insulating properties. The at least one melt channel may be configured as a melt pipe.

[0017] Between at least one melt channel and at least one bearing, a fit, such as a clearance fit, can be effectively provided. Additionally or alternatively, a fit, such as a clearance fit, can be effectively provided between at least one melt channel and at least a portion of the extrusion die adjacent thereto (e.g., a housing portion). Additionally or alternatively, a fit, such as a clearance fit, can be effectively provided between the at least one bearing and a portion adjacent thereto (e.g., a housing portion). In addition or alternatively, a groove structure, a notch structure or a recess can also be provided with respect to the fit. The portion or the housing portion of the extrusion die can be a structural element of the extrusion die that particularly surrounds the bearing.

[0018] At least one melt channel can be configured as a one-piece structure. At least one melt channel can be configured as a multi-piece structure, for example, a two-piece structure. The components of at least one melt channel can be configured to be displaceable relative to each other, for example, substantially along the longitudinal direction of at least one melt channel. The components of at least one melt channel can be configured to be displaceable into each other. Between the components of at least one melt channel, an elastic element can be effective or provided, the elastic element can be, for example, a spring element and / or a bellows, the bellows can be, for example, a corrugated bellows. Thus, different linear expansions can be compensated. Between the components of at least one melt channel, fitting and / or sealing surfaces and / or seals can be effective or provided. In the displaceable transition region of the portion, the fitting and / or sealing surfaces and / or seals can be effectively provided. The seal can be a metal seal. Thus, the plastic melt can be prevented from escaping from the gap between the components.

[0019] At least one melt channel can be implemented at least partially in a thermally separate manner. At least one melt channel can extend through the extrusion die in a thermally separate manner. A plurality of melt channels, for example two, three, or four melt channels, can be separated from one another at least partially in a thermally separate manner. This can be achieved by thermal separation. This makes it possible to achieve different temperature controls on the plastic melts moving through the melt channels, thereby optimally influencing the different plastic materials to be processed. Thus, it is possible to feed plastic materials having significantly different temperatures to the extrusion die after plasticization and maintain them at these temperatures at the material distribution point, so that, in particular, temperature balancing occurs only in the extrudates that are stacked together.

[0020] The at least one melt channel can be configured at least partially as a tube or a tube system.The at least one melt channel can have a circular or angular cross section.

[0021] The extrusion die can have at least one distribution element. For example, the extrusion die can have multiple distribution elements, such as exactly two or exactly three distribution elements. The number of distribution elements can correspond to the number of layers in the multi-layer profile or corresponding multi-layer tube to be produced. The at least one melt channel can be configured and / or defined at least partially by the distribution element and / or a portion of the extrusion die (e.g., a housing portion).

[0022] At least one distributing element can be configured as a one-piece or multi-piece structure, for example, a two-piece structure. For example, at least one distributing element can include a pre-distributing element and a spiral distributing element. The pre-distributing element can have a main channel and / or at least one pre-distributing channel. The spiral distributing element can include at least one side channel. The at least one side channel can extend in a spiral manner in the peripheral area of ​​the spiral distributing element. The main channel can transition to at least one pre-distributing channel and / or at least one side channel. At least one pre-distributing channel can transition to at least one side channel.

[0023] At least one distribution element can be configured as a spiral distributor. The spiral distributor can be an axial spiral distributor. The spiral distributor can be substantially cylindrical, for example, a hollow cylinder. The spiral distributor can be configured as a single piece or multiple pieces. The spiral distributor can have a main channel. The main channel can be an inlet channel, for example, a melt inlet channel. The spiral distributor can have at least one secondary channel, in particular a fluid and / or fluid connection to the main channel, for example, a fluid connection. The at least one secondary channel can extend in a spiral manner in the peripheral area of ​​the spiral distributor. The main channel can transition into the at least one secondary channel. The at least one secondary channel can be an outlet channel, for example, a melt outlet channel. The at least one secondary channel can be a spiral distributor channel. The spiral distributor can have multiple secondary channels. The multiple secondary channels can be fluidically connected to the main channel on the inlet side or can each open into the main channel. The multiple secondary channels can form a spiral arrangement. The plastic melt can be fed into the spiral distributor via the main channel. From the main channel, the plastic melt can be further directed to the at least one secondary channel or multiple secondary channels. In the at least one or more secondary channels, the plastic melt can be imparted with a uniform and / or hollow shape. The main channel and / or the at least one or more secondary channels can be components of the melt channel and / or at least partially form and / or define the melt channel. The main channel and / or the at least one or more secondary channels and / or the at least one or more predistribution channels can be configured at least partially as holes or slots.

[0024] The extrusion die can include a housing. The housing can be configured as a multi-piece structure. The housing can include multiple housing sections or corresponding housing components. At least one distribution element can be disposed within the housing. At least one melt channel can be disposed within the housing.

[0025] The at least one melt channel and / or the at least one distribution element can be arranged and / or aligned substantially along the axial direction, in particular the extrusion direction.

[0026] The melt channels and / or melt streams can be combined together essentially in the axial direction, in particular in the extrusion direction. The combination of the individual melt channels and / or melt streams can be achieved essentially in the axial direction, in particular in the extrusion direction, and in the radial direction, by means of L-shaped or T-shaped connection arrangements or connectors.

[0027] At least two melt channels can transition into a shared annular melt channel toward the melt outlet. This annular melt channel can be at least partially thermally separated. The annular melt channel can be substantially concentric with the extrusion direction or axis. The annular melt channel can be an annular gap melt channel. The annular melt channel can be configured to generate an annular gap flow of the plastic melt. At least two melt streams can be combined in the annular melt channel.

[0028] The corresponding thermal separation can be formed by a gap and / or cavity. The gap and / or cavity can be annular and / or spiral. The gap can be an annular gap, an air gap, or a vacuum gap. The cavity can be a hollow cavity, such as a hollow cavity and / or a vacuum cavity. The gap and / or cavity can have a feed or inlet and / or a discharge or outlet for a temperature control medium. The corresponding thermal separation can also be provided in addition or alternatively by an insulating element, which can be arranged completely or at least partially in the gap or cavity. The insulating element can be arranged completely or at least partially on at least one melt channel, for example on a surface of at least one melt channel, such as an adjacent surface and / or at a fixing point, such as a threaded connection point. The insulating element can at least partially form and / or define at least one melt channel. The insulating element can be configured in a cylindrical and / or cup-shaped manner. The insulating element can be made of a material with low thermal conductivity. Materials with different thermal conductivities can be provided, such as steel. The insulation element can be made of or contain at least one of metal, such as steel or other alloys, plastic, and / or an insulating material, such as wool, such as mineral wool or glass wool. The insulating material can be synthetic and / or natural fiber insulation. The insulation element can also contain natural materials. In particular, the material of the insulation element can be configured as a poor thermal conductor. The insulation element can be configured as an intermediate and / or connecting element for at least one distribution element, such as the first distribution element. The insulation element can be configured as an insulating sleeve or an insulating bushing.

[0029] The thermal separation and / or insulation element can be configured as a coating, in particular an insulating coating. The coating can be at least partially disposed inside or outside the at least one melt channel. For example, the coating can be an inner or outer coating of the at least one melt channel. The at least one melt channel can be at least partially coated with the insulating coating. The coating can be a metal, or another alloy and / or plastic, such as steel. In particular, the coating material can be configured as a poor thermal conductor or have a correspondingly low thermal conductivity.

[0030] An insulating element, or a corresponding insulating sleeve, or insulating lining, may be arranged around at least a portion of at least one melt channel. The insulating element, insulating sleeve, or insulating lining may include at least one heating and / or cooling element. The heating and / or cooling element may be controlled by a temperature control device. The heating and / or cooling element may be configured as an electric heating and / or cooling element or a hydraulic heating and / or cooling element. The heating element may be a heating tape. The heating tape may be a ceramic heating tape, an aluminum heating tape, or a mica heating tape.

[0031] The gaps or cavities can be filled or can be filled with a temperature control medium, such as a heating medium or a cooling medium, such as a gas and / or a fluid, such as air, or water and / or oil. A vacuum can be provided and / or generated substantially in the gaps and / or cavities. The thermal separation, in particular the gaps, cavities, insulating elements, insulating sleeves or insulating bushings, can be provided with or connected to temperature control devices, which are independent of each other. For example, a temperature control medium can flow and / or be supplied through each gap or cavity or selected gaps or cavities with a predetermined temperature in order to control the temperature of the plastic melt in the relevant melt channel accordingly, for example to heat or cool or to keep it at a predetermined temperature.

[0032] Another aspect relates to an extrusion system. The extrusion system can be configured and / or arranged to produce a hollow plastic profile, such as a hollow plastic tube, such as a multilayer tube. The extrusion system can include an extrusion die. The extrusion die can be configured as described above and / or below. The extrusion system can also include at least one extruder. The at least one extruder can be a single-screw extruder or a twin-screw extruder. The extrusion system can provide an extruder for each melt inlet of the extrusion die.

[0033] In summary or in other words, the present invention provides an extrusion die, such as a tube die, a pipe die, or a multilayer pipe die, in which an additional structure is provided, wherein melt-guiding components can be mounted movably relative to one another and / or can be made and / or configured accordingly from a material with a low coefficient of expansion (thermal expansion coefficient), and / or configured accordingly to compensate for expansion. For example, a floating bearing for the melt line (melt channel) can be provided for this purpose. This additional structure can also ensure that the different plastics remain separated for as long as possible while maintaining different temperatures. This can be achieved by thermally separating the layers or plastic melts, controlling their temperature, and / or combining the layers or plastic melts as late as possible in the die.

[0034] The present invention enables the processing of materials or plastic melts that must be processed at different temperatures for process-related reasons within the die head. This prevents component damage, particularly during continuous operation. This potentially extends the service life. Multi-stage extrusion processes can be eliminated, as only a single die head is required. A wider tolerance range can be achieved, thereby reducing manufacturing costs. Economic throughput can be increased. The die head is also suitable for producing large-diameter tubes. It is possible to cover a wide range of tube sizes with each die head. Furthermore, a wide processing window for different plastics is possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings; schematically shown here by way of example:

[0036] Figure 1 shows a cross-sectional view of an extrusion die;

[0037] Figure 2 A variation of a floating / movable bearing is shown;

[0038] Figure 3 Another variant of a floating / movable bearing is shown. DETAILED DESCRIPTION

[0039] Figure 1 A cross-sectional view of an extrusion die 100 is shown. The extrusion die 100 is configured as a tube extrusion die, such as a tube head, for manufacturing a hollow plastic multilayer tube. In this example, three plastic melts can be supplied to the extrusion die 100 to manufacture a three-layer plastic tube.

[0040] The extrusion die 100 includes at least one melt channel 102 extending between a melt inlet 104 and a melt outlet 106. At least a portion of the melt channel 102 is mounted in a substantially floating / movable manner. To this end, the extrusion die has at least one bearing 108 configured to support the at least one melt channel 102 in a substantially floating / movable manner.

[0041] The at least one bearing 108 is configured in particular to enable at least one melt channel 102 and parts of the extrusion die 100 or respectively parts of the housing of the extrusion die 100 to move relative to one another and to equalize expansion and / or thermal expansion.

[0042] In this exemplary embodiment, at least one bearing 108 includes two bearing elements 110 and 112. The two bearing elements 110 and 112 of the at least one bearing 108 are arranged on opposite sides of a melt channel portion 114 of the at least one melt channel 102. Furthermore, the two bearing elements 110 and 112 are securely connected to the at least one melt channel 102. The bearing elements 110 and 112 are each configured to be movable or displaceable relative to a portion of the extrusion die 100 or a housing / housing portion of the extrusion die 100. The portion of the extrusion die or the housing portion may be a structural element specifically surrounding the bearing elements 110 and 112. The at least one bearing 108 is thus configured as a support bearing. Alternatively, a bearing element, such as bearing element 110, may be axially fixed relative to a portion of the extrusion die 100 or a housing / housing portion of the extrusion die 100. The bearing 108 may thus be configured as a fixed-free bearing. The at least one melt channel 102 can thus expand or move primarily in the longitudinal direction or in a direction opposite to the extrusion direction due to thermal expansion. Thus, equalization of thermal expansion may be achieved, and damage to at least one melt channel 102 or the housing or parts / elements of the extrusion die 100 may be prevented.

[0043] Furthermore, at least one melt channel 102 is at least partially thermally isolated. In this exemplary embodiment, thermal isolation is achieved via a gap or cavity 116. Furthermore, at least one melt channel 102 is at least partially surrounded by at least one insulating element 118, which is configured as an insulating sleeve. The insulating sleeve may include one or more cooling and / or heating elements. The heating element may be a heating tape. The heating tape may be a ceramic heating tape, an aluminum heating tape, or a mica heating tape.

[0044] For temperature control, a temperature control medium, such as a heating medium or a cooling medium, such as a gas and / or a fluid, such as air, can be additionally fed into the cavity 116 by means of a temperature control device. Alternatively, a vacuum can be provided and / or generated in the cavity 116.

[0045] Figure 2 A variant of a floating / movable bearing 200 is shown. Figure 1 The exemplary embodiments shown are different in that Figure 2 In this embodiment, at least one melt channel 102 is configured as a multi-piece structure, here a two-piece structure, including a first component 202 and a second component 204 .

[0046] The two components 202 and 204 of at least one melt channel 102 are displaceable relative to each other substantially along the longitudinal direction of at least one melt channel. In addition, the two components 202 and 204 of at least one melt channel 102 are displaceable into each other, wherein the second component 204 is displaceable into the first component 202.

[0047] A mating or sealing surface 206 is effectively provided between the two components 202 , 204 of the at least one melt channel 102 such that plastic melt cannot escape through the gap.

[0048] In addition, special reference is made to Figure 1 and its related descriptions.

[0049] Figure 3 A further variant of the floating / movable bearing 300 is shown. According to this embodiment, the at least one melt channel 102 is also configured in two parts, including a first part 302 and a second part 304 .

[0050] and Figure 2 The exemplary embodiments shown vary according to Figure 3 The two components 302 and 304 of the present embodiment may not be configured to be displaceable into one another, but rather are merely displaceable relative to one another substantially along the longitudinal direction of the at least one melt channel 102 .

[0051] An elastic element 306 is effectively arranged between the two components 302, 304 of at least one melt channel 102. The elastic element 306 is configured as a corrugated bellows. Alternatively, the elastic element 306 can be configured as a spring element. The corrugated bellows is configured to be flexible and to enable movement of the two components 302, 304 relative to each other.

[0052] In addition, special reference is made to Figure 1 and Figure 2 and its related descriptions.

[0053] In particular, optional features of the invention are designated with the word “may.” Thus, the invention also includes further developments and / or exemplary embodiments, which may additionally or alternatively have the corresponding features or corresponding characteristics.

[0054] If desired, isolated features may be singled out from the combination of features disclosed herein and, where applicable, combined with other features to define the subject matter of the claims, taking into account existing structural and / or functional relationships between the features.

[0055] Reference Signs List

[0056] 100 extrusion die head

[0057] 102 melt channel

[0058] 104 melt inlet

[0059] 106 melt outlet

[0060] 108 bearings

[0061] 110 bearing elements

[0062] 112 bearing elements

[0063] 114 pipe part

[0064] 116 gap / cavity

[0065] 118 Insulation element / insulation sleeve

[0066] 200 bearings

[0067] 202 first component of the melt channel

[0068] 204 second component of the melt channel

[0069] 206 mating / sealing surface

[0070] 300 bearings

[0071] 302 first component of the melt channel

[0072] The second part of the 304 melt channel

[0073] 306 elastic element

Claims

1. An extrusion die (100) for producing a hollow plastic profile, the extrusion die (100) being in particular a tube extrusion die, the plastic profile being in particular a plastic tube, the extrusion die (100) comprising at least one melt channel (102), and a nozzle and / or a nozzle group, the melt channel (102) extending between a melt inlet (104) and a melt outlet (106), wherein the melt outlet (106) is configured such that a plastic melt and / or the hollow plastic profile being produced is transferred to the nozzle and / or the nozzle group, characterized in that At least a portion of the melt channel (102) is mounted in a substantially floating manner and / or is configured in a movably manner.

2. The extrusion die head (100) according to claim 1, characterized in that The extrusion die (100) has at least one bearing (108, 200, 300) configured to support the at least one melt channel (102) in a substantially floating and / or movably manner.

3. The extrusion die head (100) according to claim 2, characterized in that: The at least one bearing (108, 200, 300) is configured as a support bearing or a fixed-free bearing.

4. The extrusion die (100) according to at least one of the preceding claims, characterized in that The at least one melt channel (102) and / or the at least one bearing (108, 200, 300) are at least partially made of a material having a low coefficient of thermal expansion.

5. The extrusion die (100) according to at least one of the preceding claims, characterized in that The at least one melt channel (102) and the at least one bearing (108, 200, 300) and / or the at least one melt channel (102) or respectively at least a portion thereof and at least a portion of the extrusion die (100) adjacent thereto have different thermal expansion coefficients, the at least one portion of the extrusion die (100) being, for example, a housing portion.

6. The extrusion die (100) according to at least one of the preceding claims, characterized in that The at least one melt channel (102) and / or the at least one bearing (108, 200, 300) are at least partially made of an elastically deformable material.

7. The extrusion die (100) according to at least one of the preceding claims, characterized in that The at least one bearing (108, 200, 300) and / or the at least one melt channel (102) are flexible and / or bendable.

8. The extrusion die (100) according to at least one of the preceding claims, characterized in that The at least one melt channel (102) is configured as a multi-part, in particular a two-part, component parts (202, 204, 302, 304) of the at least one melt channel (102) being configured to be displaceable relative to one another, in particular in a longitudinal direction of the at least one melt channel (102).

9. The extrusion die head (100) according to claim 8, characterized in that: The components (202, 204) of the at least one melt channel (102) are configured to be displaceable into one another.

10. The extrusion die head (100) according to claim 8 or 9, characterized in that: Mating and / or sealing surfaces (206) and / or seals are effective and / or provided between components (202, 204) of the at least one melt channel (102).

11. The extrusion die (100) according to at least one of the preceding claims 8 to 10, characterized in that An elastic element (306), in particular a spring element and / or a bellows, such as a corrugated bellows, is active and / or arranged between the components (302, 304) of the at least one melt channel (102).

12. The extrusion die (100) according to at least one of the preceding claims, characterized in that The at least one melt channel (102) is at least partially embodied in a thermally separated manner, preferably the at least one melt channel (102) extends through the extrusion die in a thermally separated manner.

13. The extrusion die (100) according to at least one of the preceding claims, characterized in that The extrusion die (100) has a plurality of melt channels (102), and the plurality of melt channels (102) are at least partially thermally separated from each other. The plurality of melt channels (102) are preferably two, three or four.

14. The extrusion die head (100) according to claim 2, characterized in that The at least one bearing (108) is configured to enable the at least one melt channel (102) and portions of the extrusion die (100), a housing or housing portions of the extrusion die (100) to move relative to each other and to balance expansion and / or thermal expansion.

15. The extrusion die head (100) according to claim 3, characterized in that The at least one bearing (108) has two bearing elements (110, 112), wherein the two bearing elements (110, 112) are arranged on opposite sides of a melt channel portion (114) of the at least one melt channel (102), and preferably the two bearing elements (110, 112) are firmly connected to the at least one melt channel (102) and are configured to be movable or respectively displaceable relative to a portion of the extrusion die (100), a housing of the extrusion die (100) or a housing portion, respectively.

16. An extrusion system comprising at least one extruder; and Extrusion die (100) according to at least one of the preceding claims.

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