SE543730C2

SE543730C2 - An extrusion and/or pultrusion device and method

Info

Publication number: SE543730C2
Application number: SE2051101A
Authority: SE
Inventors: Kragh Mark Jansson
Original assignee: Reliefed Ab
Priority date: 2019-05-06
Filing date: 2019-05-06
Publication date: 2021-07-06
Also published as: SE2051101A1

Abstract

An extrusion- or pultrusion device (1) for forming a profile product (2) in a production direction (Y), said device comprising:-a rotating die (3) having two opposite first and second side walls (5, 6) and an outer circumferential surface (4) there between, wherein the rotating die (3) comprises a first side portion (23) in connection to the first side wall and a second side portion (25) in connection to the second side wall (6) and a mid-portion (22) extending between the first and second side portions (23, 25), wherein the width of the first channel section (9) is, at least along a portion of its length and at least along a portion of its height, less than a distance between the two opposite side walls (5, 6) of the rotating die (3).

Description

1AN EXTRUSION AND/OR PULTRUSION DEVICE AND l\/IETHOD TECHNICAL FIELD The invention relates to an extrusion and/or pultrusion device for forming a profile product in a production direction, said device comprising: -a rotating die, extending in a radia| direction and a width direction, having two opposite firstand second side walls and an outer circumferential surface extending in the width directionthere between, wherein the rotating die comprises a first side portion in connection to thefirst side wall and a second side portion in connection to the second side wall and a mid- portion extending between the first and second side portions,and -a profile definition zone having a longitudinal direction coinciding with the productiondirection, a height direction and a width direction being perpendicular to the height direction,comprising a through channel comprising a first channel section followed by a second channelsection downstream the first channel section with reference to the production direction,wherein the rotating die is rotatable about an axis extending across the production directionand arranged to allow the outer circumferential surface to, while the rotating die rotates, exert a pressure onto a surface ofthe material when fed through the profile definition zone-the first channel section is circumferentially delimited by one or more wallsand wherein - the second channel section is circumferentially delimited by -the circumferential surface of the rotating die and -a channel portion comprising -a counter-bearing opposite the rotating die and -opposing first and second channel portion side walls between the rotating die and the counter-bearing 2 The invention also relates to a method for producing a profile product by use of such a device.

BACKGROUND ART ln the field of extrusion and/or pultrusion devices it is known using a rotating die immediatelydownstream a more traditional extrusion and/or pultrusion device using fixed or static walls.This type of extrusion with a rotating die is hereinafter referred to as 3D-extrusion and relatesto that the rotating die operates in a pressurized zone in connection to the more traditionalextrusion and/or pultrusion portion of the device, which differs 3D-extrusion fromcalendaring. The combination of the static walls in the first channel section and a rotating diein the second channel section gives the benefit of producing a profile product at a very highspeed with maintained high quality of shape and imprint. lt is thus an effective and relativelycheap production method that can be used for most materials that can be formed by use of extrusion, i.e. everything from e.g. plastic to aluminium.SUMMARY OF THE INVENTION With reference to background art, there is however a need for an improved leakageprotection at a portion of the device where the first and second side walls of the rotating die meets the opposing first and second channel portion side walls in the second channel section.

The invention relates to an extrusion and/or pultrusion device for forming a profile product in a production direction, said device comprising: -a rotating die , extending in a radial direction and a width direction, having two opposite firstand second side walls and an outer circumferential surface extending in the width directionthere between, wherein the rotating die comprises a first side portion in connection to thefirst side wall and a second side portion in connection to the second side wall and a mid- portion extending between the first and second side portions,and -a profile definition zone having a longitudinal direction coinciding with the productiondirection, a height direction and a width direction being perpendicular to the height direction,comprising a through channel comprising a first channel section followed by a second channel section downstream the first channel section with reference to the production direction, 3wherein the rotating die is rotatable about an axis extending across the production directionand arranged to allow the outer circumferential surface to, while the rotating die rotates, exert a pressure onto a surface ofthe material when fed through the profile definition zone,wherein; -the first channel section is circumferentially delimited by one or more walls and wherein - the second channel section is circumferentially delimited by -the circumferential surface of the rotating die and -a channel portion comprising -a counter-bearing opposite the rotating die and -opposing first and second channel portion side walls between the rotating die and the counter-bearing, wherein the width of the first channel section is, at least along a portion of its length and atleast along a portion of its height, less than a distance between the two opposite side walls ofthe rotating die. Hence, the first channel section should be at least smaller in width than adistance between the opposing first and second channel portion side walls in the secondchannel section. The difference in width between the first channel section and the secondchannel section depends on features of the first and second side portions and tolerancesbetween the rotating die and the respective opposing first and second channel portion sidewalls. The width of the first channel section should be less than a distance being the distancebetween the opposing first and second channel portion side walls minus the sum oftolerances, i.e. the sum ofthe gap between the rotating die side walls and the respectiveopposing first and second channel portion side walls in the second channel section. |fthe firstand second side portion comprises flange portions, see below for further explanation, thenthe width of the first channel section is, at least along a portion of its length and at least alonga portion of its height, less than a distance between the two flange portions.

One advantage here is that local pressure reduction is achieved in connection to the first andsecond outer edge portions due to the geometrical difference in the first and second channelsections. ln order to more easily explain the device, a cylindrical coordinate system has been used for the rotating die and an orthogonal Cartesian coordinate system for a three-dimensional space 4 for the device in general. The rotating die therefore is described as having a width directionfrom end to end coinciding with a centre line, i.e. rotation axis, about which the rotating dierotates, and a thickness in a radia| direction being orthogonal to the width direction. The outercircumferential surface further extends about the axis in a rotation direction beingperpendicular to the width direction. Here, rotation symmetric refers to a symmetricaldisposition about the rotating axis or a rotationa| balanced disposition ofthe matter in therotating die. The device in general, i.e. e.g. the profile definition zone, the first and secondchannel sections, is described as having a width direction, a height direction and a longitudinal direction, where the longitudinal direction coincides with the general production direction.

The rotating die is arranged to be rotatable about the axis and the axis can be directly or indirectly stored in and rotatably coupled to the first and second channel portion side walls.

With reference to the above described coordinate systems it should be noted that the axis ofthe rotating die can be arranged perpendicular to the longitudinal direction, i.e. to the production direction of the device in general, or can be arranged at an angle.

According to one example, the axis of the rotating die is directed substantially perpendicularto the production direction with the outer circumferential surface extending across the production direction in a width direction thereof.

According to one example, the axis ofthe rotating die coincide with the width direction ofthedevice in general and the width direction of the rotating die coincide with the width directionofthe device in general. The longitudinal direction coincide with the production direction, i.e. the main direction along which the material travels during production.

According to one example, the axis of the rotating die does not coincide with the widthdirection ofthe device in general, but the axis of the rotating die and the width direction ofthe rotating die is arranged at an angle being less or more than 900 to the longitudinaldirection. However, the axis of the rotating die is arranged such that the outer circumferential surface extends across the production direction in a width direction thereof.

With reference to either one ofthe two examples above, the normal to the axis ofthe rotatingdie coincides with the height direction of the device in general. Here, the normal coincides with the radia| direction ofthe rotating die. Here, the axis of the rotating die is directed perpendicular to the normal of the production direction regardless of whether the axis of therotating die coincide or not with the width direction of the device in general. However,according to one example the normal to the axis of the rotating die can be arranged at anangle to the height direction ofthe device in general. However, the axis of the rotating die isarranged such that the outer circumferential surface extends across the production direction in a width direction thereof, but at an angle to the production direction.

According to one example, the one or more walls define a first cross-section at the end ofthefirst channel section and wherein the second channel section defines a second cross-section ata position where the distance between the circumferential surface and the counter-bearing isat a minimum. As stated above, the geometry of the first channel section is different from thesecond channel section such that the material passing through the first channel sectionchanges form when entering the second channel section. The changing of form is essential forincreasing or maintaining the pressure level to such an extent that it will overcome theinternal resistance (shear stresses) of the material, fast enough, for the material to saturate the second cross section, including an imprint ofthe rotating die.

According to one example, the minimum distance in the height direction between thecircumferential surface and the counter-bearing in the second cross-section is less than amaximum distance in the height direction in the first cross-section. This has the advantagethat the material entering the second channel section will be compressed in the secondchannel section such that the pressure is increased or maintained to such level that thematerial will transform fast enough to saturate the second channel section, including the imprint of the rotating die.

Hence, the pressure is increased or maintained to such level that the material will transformfast enough to saturate the second channel section, including an imprint of the rotating die.The pressure is achieved by a combination of an imprint depth of a pattern in thecircumferential surface and a Poisson effect and/or a combination of the shape transition dueto the geometrical shape difference between the first and second cross-sections and the Poisson effect. 6The local pressure reduction is achieved in connection to the first and/or second side portionsdue to the geometrical difference in the first and second channel sections and a wake effect downstream the first channel section in connection to the first and/or second side portions.

According to one example, the first channel section comprises a third side portion extending inthe width direction, wherein the third side portion is arranged in relation to the first sideportion such that a pressure in the material to be extruded is less in connection to the first side portion than in connection to the third side portion,and/or wherein the first channel section comprises a fourth side portion extending in the widthdirection, wherein the fourth side portion is arranged in relation to the second side portionsuch that a pressure in the material to be extruded is less in connection to the second sideportion than in connection to the fourth side portion. One advantage is that third and fourthside portions creates a wake effect and thus a local pressure decrease downstream the thirdand fourth side portions that further decreases the local pressure in the first and second side portions of the rotating die.

According one example, the first channel section comprises leeward means in connection tothe third and/or fourth side portions arranged to decrease the space ofthe first channel section in the height direction being perpendicular to the width direction.

According one example the first channel section comprises leeward means in connection tothe third and/or fourth side portions arranged to decrease the space ofthe first channel section in the width direction. A combination of leeward means are also possible.

According to one example, the leeward means is an elevation facing into the through channel.The elevation can be arranged from top to bottom in the first channel section, or can bearranged as a part or several parts along the distance between the top to bottom of the firstchannel section. The leeward means are advantageously positioned in connection to the first and second side portions ofthe rotating die.

One advantage with the leeward means is that the third and fourth side portions furtherdecreases the local pressure in connection to recesses and/or flange portions in the first and second side portions ofthe rotating die, see below. 7 According to one example, the second channel section is arranged in relation to the firstchannel section with a predetermined second distance between the radially outermostportion of the circumferential surface of the rotating die and the counter-bearing in thechannel portion being less than a predetermined first distance between the most far apartportions ofthe first channel section taken in a height direction coinciding with the radial direction,and/or wherein: the second channel section is arranged in relation to the first channel section with apredetermined fourth distance between the innermost narrowest portions ofthe channelportion in the width direction being greater than a predetermined third distance between sidewalls in the first channel section taken in the width direction at the exit area from the first channel section.

One advantage is that the narrower first channel section creates a wake effect with decreasedpressure downstream in the first channel section and in connection to the first and second side portions of the rotating die due to that the second channels section is broader.

Further strategies for local pressure reduction are possible in combination with further leakage preventing strategies.

According to one example embodiment, the first side portion comprises a first flange portionextending in the width direction and the radial direction with an extension in the radialdirection exceeding the radial extension of at least a part of the mid-portion and wherein thesecond side portion comprises a second flange portion extending in the width direction andthe radial direction with an extension in the radial direction exceeding the radial extension of at least a part of the mid-portion.

One advantage is that the flange portions physically hinder the material from flowing all theway to the first and second side walls of the rotating die and thus the first and second channel portion side walls.

According to one example, the first flange portion comprises a first outer circumferential surface delimiting the first flange portion in the rotational direction and wherein the second 8flange portion comprises a second outer circumferential surface delimiting the second flange portion in the rotational direction. lt should be noted that the first and/or the second side portions could comprise the first flange portion and/or the second flange portion in different ways.

According to one example, the first and/or second side portions comprise only the flangeportions in the first and second side portions. Here, there is a transition from the mid-portionto the respective flange portions coinciding with the transition from the mid-portion to each of the first and second side portions.

According to another example, the first and second side portions comprise the first andsecond flange portions respectively and each ofthe first and second side portions comprises a first additional portion extending in the width direction of the rotating die.

According to one example, the first additional portion is arranged directly adjacent the mid-portion and there is a transition from the mid-portion to the first additional side portioncoinciding with the transition from the mid-portion to each of the first and second sideportions. The first additional portion in the first side portion thus extends between the firstflange portion to the mid-portion and the first additional portion in the second side portionthus extends between the second flange portion to the mid-portion. The first additionalportion could for example comprise a recess according to examples described below or a portion having the same radial extension as the mid-portion but with different features.

According to one example, the first and/or second flange portions are arranged directlyadjacent the mid-portion and there is a transition from the mid-portion to the first and/orsecond flange portions coinciding with the transition from the mid-portion to each ofthe firstand second side portions. Here, the first additional side portion in the first side portion isarranged between the first side wall and the first flange portion and the first additional sideportion in the second side portion is arranged between the second side wall and the second flange portion.

According to one example, the first and/or second side portions comprise the first and secondflange portions arranged at a distance from the mid-portion with a second additional portion extending in the width direction ofthe rotating die between the mid portion and the first 9additional side portion and there is a transition from the mid-portion to each ofthe flangeportions not-coinciding with the transition from the mid-portion to each of the first andsecond side portions. The second additional portion is in some aspects different from similaraspects of the mid-portion, for example the second additional portion could be textured or non-textured or be of a different material than the mid-portion.

According to one example, the first and/or the second side portions comprise a combinationof the above and below described first and second flange portions, annual recesses and first and second additional portions.

According to one example, the first and second outer circumferential surfaces follow thecontour ofthe mid-portion, i.e. has the same geometrical shape or form but with different radial extension. One advantage is a uniform general shape of the profile product.

According to one example, the first and/or second outer circumferential surfaces are arrangedin an undulating manner, i.e. the first and/or second flange portions are arranged with acogwheel like shape. According to one example, the first and/or second outer circumferentialsurfaces are arranged with a smooth annular shape, i.e. the first and/or second flange portions are arranged with a circular or oval shape.

According to one example, the first and second flange portions are rotation symmetric aboutan axis of the rotating die. One advantage is less oscillation problems when the rotating die rotates at a high speed. lt is further possible with use of additional leakage reducing or eliminating strategies incombination with the above described flange portions and/or in combination with the above described local pressure reduction in connection to the first and second outer edge portions.

According to one example, the first and/or second side portions comprises one or morerecesses extending the width direction and in the radial direction with an extension in the radial direction being less than a radial extension of at least a part of the mid-portion.

One advantage with the device is that the recess or recesses create a space with decreasedpressure in the first and/or second side portions compared to other parts of the rotating diepositioned axially, i.e. in the width direction, closer to a centre ofthe rotating die compared to the recess or recesses. The decreased pressure reduces and/or removes the problem with leakage where the first and second side walls of the rotating die meets the opposing first andsecond channel portion side walls in the second channel section since the material that isprocessed can flow towards the first and second side walls but the decrease in pressure on thematerial inherently slows down the flow. Dependent on design, the material flow can bestopped before reaching the first and second side walls of the rotating die or may be allowedto flow at a controlled rate to hit the first and second channel portion side walls but with apredetermined and adequate tolerance between the first and second side walls of the rotatingdie and the first and second channel portion side walls that hinders leakage. The tolerancedepends also on what material that is worked, a more fluid material demands a smalltolerance, i.e. a small distance between the rotating die and the first and second channelportion side walls, and a less fluid material can allow for a greater tolerance, i.e. a largerdistance. The flow of material is also dependent on the shape and form ofthe rotating die andthe position of the rotation die with relation to the shape and form of the first channelsection. For example, a rotating die that is radially thicker in the middle than on the sides willcreate a larger pressure centrally and thus a greater flow towards the first and second sidewalls ofthe rotating die compared to a rotating die that is radially smaller in the middle than on the sides.

The first and second side walls are positioned in relation to the first and second channelportion side walls such that the first and second side walls are rotatably connected to the firstand second channel portion side walls with the advantageous possibility of a greatertolerance due to the leakage strategy where the width of the first channel section is, at leastalong a portion of its length and at least along a portion of its height, less than a distancebetween the two opposite side walls ofthe rotating die and/or the use of one or more recesses and/or the use of one or more flange portions.

Hence, the size ofthe recesses depends on a number of parameters and need to be designeddependent on, for example, the material to be processed, the shape and form ofthe rotatingdie and the relationship between the shape and form of the first channel section and the second channel section.

The size of the recess, i.e. the extension in the width direction, the rotation direction, i.e. the circumferential direction being perpendicular to the width direction and depth of the recess, 11 gives the size of the space into which the material can flow and therefore gives the possibilityto determine how much the pressure should be reduced in the recess, compared to at least aportion of the mid-portion. The rule is that the greater the space the more the pressuredecreases, but also the shape of the recess has an impact on gradient ofthe pressuredifference. For example, a step, i.e. 900 drop, gives a more immediate pressure drop than a slanted surface. lt should be noted that one of or both the first and second side portions comprises a recess.According to one example, the recess is an annular recess, i.e. extending circumferentiallyabout the rotational axis. According to one example, the first and/or second side portionscomprises one or more recesses not being annular but arranged as one ore many singlerecesses. Each single recess has an extension in the width direction, the rotation direction, i.e.the circumferential direction being perpendicular to the width direction, and the radialdirection. The single recesses can have similar or different shape and are advantageously. Thesingle recesses can be arranged in different patterns extending circumferentially about therotational axis. The single recesses can be arranged in one single line of recesses extendingcircumferentially about the rotational axis or can be arranged as two or more lines of recessesarranged next to each other in the width direction. The two or more lines of recesses can bearranged such that one or more recesses are arranged next to each other in the widthdirection or offset to each other in the circumferential direction. The different lines of single recesses can have same or different number of recesses. lt should be noted that the first and/or the second side portions could comprise the recess in different ways.

According to one example, the first and/or second side portions comprise only the recess orrecesses in the first and second side portions. Here, there is a transition from the mid-portionto the recess coinciding with the transition from the mid-portion to each of the first and second side portions.

According to another example, the first and second side portions comprises the recess orrecesses and a first additional portion extending in the width direction ofthe rotating die.According to one example, the recess is arranged directly adjacent the mid-portion and there is a transition from the mid-portion to the recess coinciding with the transition from the mid- 12portion to each of the first and second side portions. The first additional portion thus extendsbetween the recess and the first and/or second side wall respectively of the rotating die. Thefirst additional portion could for example comprise a flange according to one example described above or a portion having the same radial extension as the mid-portion.

According to one example, the recess or recesses are arranged at a distance from the mid-portion with a second additional portion extending in the width direction of the rotating diebetween the mid portion and the recess and there is a transition from the mid-portion to therecess not-coinciding with the transition from the mid-portion to each of the first and secondside portions, but a transition between the second additional portion and the recess. Thesecond additional portion is in some aspects different from similar aspects of the mid-portion,for example the second additional portion could be textured or non-textured or be of a different material than the mid-portion.

According to one example, the first and/or the second side portions comprise a combination of the above described recess and first and second additional portions.

According to one example, the recess or recesses follow the contour ofthe mid-portion, i.e.has the same geometrical shape or form but with different radial extension. One advantage is a uniform general shape ofthe profile product.

According to one example, the recesses or recesses are rotation symmetric about an axis ofthe rotating die. One advantage is less oscillation problems when the rotating die rotates at a high speed.

Hence, the recess is either an indentation in the rotating die or a portion of the rotating die having a lesser radial extension compared to other parts of the rotating die. ln one example embodiment, the recess is positioned in close connection to the flangeportions and decreases pressure locally to further reduce the flow of material towards the first and second channel portion side walls.

According to one example, the circumferential surface comprises a textured portion. Theentire circumferential surface can be textured, but as an alternative only a portion can be textured. 13According to one example, the first side portion comprises a non-textured portion extendingbetween the first side wall and the textured portion and wherein the second side portion comprises a non-textured portion between the second side wall and the textured portion.

According to one example in connection to the example embodiment with flange portionsdescribed above, the first side portion comprises a non-textured portion extending betweenthe first flange portion and the textured portion and wherein the second side portioncomprises a non-textured portion between the second flange portion and the textured portion.

According to one example in connection to the example embodiment with recesses describedabove, the recess is a non-textured portion and/or the first side portion comprises a non- textured portion extending between the recess(s) and the textured portion.

The non-textured portions advantageously have a radius less than a radius to an imprint depth of the textured portion.

According to one example, the circumferential surface is non-textured or has a micro patternthat leaves only an infinitesimal imprint on the profile product that can be visible or non- visible for the human eye.

According to one example, the channel portion comprises a second rotating die arrangedopposite the first rotating die described above. The second rotating die can either replace thecounter-bearing in its entirety or can be a part of a static counter-bearing. The second rotatingdie can be arranged in a similar way as the above described first rotating die to create same ordifferent patterns on two sides of the profile product. The second rotating die can compriserecesses and/or flange portions that can be arranged to cooperate with recesses and/or flange portions of the first rotating die.

According to one example, the channel portion comprises a third rotating die arranged at anangle to the first rotating die. This rotating die replaces the opposing first or second channelportion side wall entirely or partly. The third rotating die can be arranged together with only the first rotating die or together with both the first and second rotating die. 14According to one example, the channel portion comprises a fourth rotating die arrangedopposite the third rotating die. The third rotating die can be arranged together with only the first rotating die or together with both the first and second rotating die The third and/or the fourth rotating die(s) can be arranged in a similar way as the abovedescribed first rotating die to create same or different patterns on two sides of the profileproduct. The second rotating die can comprise recesses and/or flange portions that can be arranged to cooperate with recesses and/or flange portions of the first rotating die.

According to one example, two or more rotating dies are synchronised. This has the advantageof feeding the material at the same speed. However, it could be possible to also use non-synchronous rotating dies in order to create friction and/or a special pattern and/or to compensate for material differences. ln all the above examples it is possible to use a combination of textured and non-textured rotating dies.

The invention also refers to a method for producing a profile product by use of a device according to any one of the preceding claims, wherein the method comprises -feeding a material to the first channel section and forming the same in the first channel section, - feeding the material further to the second channel section and forming the same in the second channel section.

The material that is fed into the device to form the profile product can be in the form of onehomogenous material or a mixture of two or more materials. The materials can be blended indifferent ratios and may be blended into a homogeneous mix or a mix with gradients withinthe material. One material can be a solid and another material can be mouldable, e.g. stonebits and rubber. The material can also be a layered material comprising two or more layers ofsame or different materials. The material may comprise one or more strings of solid materialthat follow through the entire extrusion or pultrusion process, e.g. a wire or another reinforcement material.

At least a part of the material should be plastically deformable when subject to the pressureapplied in the first and/or second channel sections. Such materials are often denoted viscoelastic and/or viscoplastic materials.

Furthermore, here extrusion relates to a process where a material is fed by pressure into thefirst channel section to be formed in the first and second channel sections. Pultrusion relatesto where the material to be formed is fed to the device and drawn through the first andsecond channel sections. lt should be noted that the device can be arranged purely for extrusion or purely for pultrusion or a combination of the two.

The device can be arranged for co extrusion with one or more inlet channels that connects tothe first channel section. Hence, one or more materials could be fed to the first channelsection via one channel, but two or more materials can be fed to the first channel section viaone inlet channel or a multiple channel inlets. The multiple inlet channels can be the same innumber as the number of materials or the multiple inlet channels can be less than the number of materials if two or more materials are fed via one inlet channel.

Furthermore, profile product refers to a product having a three dimensional form, i.e. length,width and height. The profile product may have a cross-section taken in the width and heightplane being similar all along the length or may be different dependent on position in length.The cross-section can have any suitable two dimensional shape, for example, round, oval,elliptical, i.e. two sides, undulating, three or more sides or a combination of the same. One ormore sides may be patterned, i.e. textured with one or more patterns. The pattern/texture is created by the rotating die. lt should be noted that the invention can be varied within the scope ofthe claims and that the examples described above and below should not be seen as limiting for the invention.

For example, the first channel section could be circumferentially delimited by static walls orcould be arranged with one or more dynamic walls as long as the material can be extruded orpultruded with the device according to the invention. Static walls has the advantage of being cheap and robust.

According to one example, the first channel portions can be arranged centred with relation to the second channels. This has the advantage that the flow of material entering the second 16channel is evenly distributed. The first and second side portions can be arranged centred withrespect to the first channel section with the advantage of having a evenly distributed decrease in pressure over the rotating die.

For example, the device could comprise several rotating devices arranged side by side, i.e. therotating device could comprise two or more rotating devices having a common rotating axel.The different rotating devices could be arranged in separate second channels or could bearranged in a common separate channel. The different rotating devices could have the sameor different texture to create same or different patterns on the profile product. The profiledproduct could thus comprise one or more strands of internal profiles running along theproduction direction and being generated by the different rotating devices. The differentstrands could be separable into separate products at predetermined separation lines thatcould coincide with the separation of the different rotating devices. However, one separaterotating die could comprise a pattern/texture that separates similar or different patterns suchthat the profiled product comprises one or more strands of internal profiles running along the production direction. Also here, the strands could be separable in the profiled product.

According to one example, one side portion, i.e. the first side portion or the second sideportion, comprises a flange but no recess, and the other side portion, i.e. the first side portion or the second side portion, comprises a recess but no flange.

The rotating die can be mounted onto an axis or can be arranged with an axis incorporated in the rotating die body.BRIEF DESCRIPTION OF THE DRAWINGSThe invention will below be described in connection to a number of drawings, wherein; Fig. 1 schematically shows a cross-sectional view from below along section A-A in figure 2 of a device according to one example of the invention; Fig. 2 schematically shows a cross-sectional perspective side view of a device according to the invention;Fig. 3a schematically shows a front view and inlet of one example of a rotary die; Fig. 3b schematically shows a perspective view of the rotary die in figure 3a; 17 Fig. 3c schematically shows a front view and inlet of one example of a rotary die; Fig. 3d schematically shows a perspective view of the rotary die in figure 3c; Fig. 4a schematically shows a back view and outlet of one example of a device according to the invention; Fig. 4b schematically shows a perspective view of the device in figure 4a; Fig. 4c schematically shows a back view and outlet of a device according to the invention; Fig. 4d schematically shows a perspective view of the device in figure 4c; Fig. 5 schematically shows a cross-sectional side view of a device according to one example of the invention Fig. 6 schematically shows a perspective back view and outlet of a device according to one example of the invention; Fig. 7 schematically shows a perspective back view and outlet of a device according to the invention; Fig. 8 schematically shows an enlarged view of a part of the device in figure 7; Fig. 9 schematically shows a front view and inlet of one example of a rotary die; Fig. 10 schematically shows a perspective view of the rotary die in figure 9; Fig. 11 schematically shows a front view and inlet of one example of a rotary die; Fig. 12 schematically shows a perspective view of the rotary die in figure 11; Fig. 13 schematically shows a view from below along section A-A in figure 2of a device according to the invention; Fig. 14 schematically shows an enlarged view of a part of the device in figure 13; Fig. 15 schematically shows a view from below along section A-A in figure 2 of a device according to one example of the invention; Fig. 16 schematically shows an enlarged view of a part of the device in figure 15; 18Fig. 17 schematically shows a back view and outlet of an assembly of rotary dies including three rotary dies;Fig. 18 schematically shows a perspective view of an assembly according to figure 17; Fig. 19 schematically shows a back view and outlet of an assembly of rotary dies including four rotary dies; Fig. 20 schematically shows a perspective view of an assembly according to figure 19, and wherein; Fig. 21 schematically shows a flow chart of a method for producing a profile product by use of a device according to what has been described in connection to figures 1-20.DETAILED DESCRIPTION The invention will below be described in connection to a number of drawings. Same features will be denoted with like numbers in all the drawings.

Here, front view with inlet and back view with outlet are used as an orientation for the readerwith regard to production direction where material to be worked is inserted into the inlet and a profile product is shaped in the device and then exits the device via the outlet. ln some drawings, the production direction is denoted PD with an arrow pointing in the production direction.

Fig. 1 schematically shows a view from below along section A-A in figure 2, i.e. in a heightdirection Z, of a device according to one example of the invention and figure 2 schematicallyshows a cross-section perspective view ofthe device in figure 1. Figures 1 and 2 show anextrusion- or pultrusion device 1 for extrusion- or pultrusion of a material for forming a profile product 2, see figures 4a-4d, in a production direction Y, said device comprising: -a rotating die 3 , extending in a radial R direction and a width direction X, having two oppositefirst and second side walls 5, 6 and an outer circumferential surface 4 extending in the widthdirection X there between, wherein the rotating die 3 comprises a first side portion 23 inconnection to the first side wall 5 and a second side portion 25 in connection to the second side wall 6 and a mid-portion 22 extending between the first and second side portions 23, 25, 19 and -a profile definition zone 7 having a longitudinal direction Y coinciding with the productiondirection Y, a height direction Z and a width direction X being perpendicular to the heightdirection Z, comprising a through channel 8 comprising a first channel section 9 followed by asecond channel section 10 downstream the first channel section 9 with reference to theproduction direction, wherein the rotating die 3 is rotatable about an axis extending acrossthe production direction Y and arranged to allow the outer circumferential surface 4 to, whilethe rotating die 3 rotates, exert a pressure onto a surface of the material when fed through the profile definition zone 7, and wherein; -the first channel section 9 is circumferentially delimited by one or more walls 11 and wherein - the second channel section 10 is circumferentially delimited by -the circumferential surface 4 ofthe rotating die 3 and -a channel portion 13 comprising -a counter-bearing 14, shown in figure 2, opposite the rotating die 3 and -opposing first and second channel portion side walls 15, 16 between the rotating die 3 and the counter-bearing 14. ln figure 1 the width D3 of the first channel section 9 is, at least along a portion of its lengthand at least along a portion of its height, less than a distance D4 between the two oppositeside walls 5, 6 ofthe rotating die 3. Hence, the first channel section 9 should be at leastsmaller in width than a distance between the opposing first and second channel portion sidewalls 15, 16 in the second channel section 10. The difference in width between the firstchannel section 9 and the second channel section 10 depends on features of the first andsecond side portions 23, 25 and tolerance between the rotating die 3 and the respectiveopposing first and second channel portion side walls 15, 16. The width D3 of the first channelsection 9 should be less than a distance D4 being the distance between the opposing first andsecond channel portion side walls 15, 16 minus the sum of tolerances, i.e. the sum of the gapbetween the rotating die side walls 5, 6 and the respective opposing first and second channelportion side walls 15, 16 in the second channel section 10. lf the first and second side portioncomprises flange portions 18, 19, see below for further explanation, then the width D3 of the first channel section 9 is, at least along a portion of its length and at least along a portion of its height, less than a distance D4 between the two flange portions 18, 19.

One advantage is that a local pressure reduction is achieved in connection to the first andsecond outer edge portions 5, 6 due to the geometrical difference in the first and secondchannel sections 9, 10. The local pressure reduction reduces the flow speed of the materialand this removes leakage problems between the first side wall 5 and the first and the firstchannel portion side wall 15; and between the second side wall 6 and the second channelportion side wall 16. This will be explained further below and also in combination withadditional leakage protection strategies. Figure 1 shows one example of an additional leakageprotection strategy and figures 13 and 15 show other examples of leakage protectionstrategies. The different examples can be combined, as shown in figure 1, which is explainedfurther above and below. lt should be noted that the rotating die 3 can be cylindrical or non-cylindrical textured or nottextured dependent on desired profile ofthe profile product. ln figure 1 the first side portion 23 comprises a first flange portion 18 extending in a radialdirection R with an extension exceeding the radial extension of at least a part ofthe mid-portion 22 and wherein the second side portion 25 comprises a second flange portion 19extending in the radial direction with an extension exceeding the radial extension of at least a part ofthe mid-portion 22.

The first flange portion 18 and the second flange portion 19 are arranged to preventmovement of the material outside the rotating die 3 in a direction towards the opposing first and second channel portion side walls 15, 16.

The first flange portion 18 comprises a first outer circumferential surface 18 delimiting the firstflange portion 18 in the rotational direction R and wherein the second flange portion 19comprises a second outer circumferential surface 21 delimiting the second flange portion 19 inthe rotational direction. The first and second outer circumferential surfaces 20, 21 arearranged at an angle being between 1-90 degrees compared to the first side wall 5 and secondside wall 6 respectively, with a radial increase towards the first side wall 5 and second side wall 6 respectively.

Fig. 3a schematically shows a front view of one example of a rotary die, and fig. 3bschematically shows a perspective view of the rotary die in figure 3a. Figures 3a and 3b show that the first flange portion 18 extends in a radial direction R with an extension exceeding the 21radial extension ofthe entire mid-portion 22 and wherein the second flange portion 19extends in the radial direction with an extension exceeding the radial extension of the entiremid-portion 22. The mid-portion 22 may however have variations in the radial extension or may have no variations as shown in figures 3a and 3b.

Fig. 3c schematically shows a front view of one example of a rotary die, and fig. 3dschematically shows a perspective view of the rotary die in figure 3c. Figures 3c and 3d showthat the first flange portion 18 extends in a radial direction R with an extension exceeding theradial extension of a part ofthe mid-portion 22, but that one part ofthe mid-portion has aradial extension exceeding the radial extension ofthe first flange portion 18. Figures 3c and 3dfurther show that the second flange portion 19 extends in a radial direction R with anextension exceeding the radial extension of a part ofthe mid-portion 22, but that one part ofthe mid-portion has a radial extension exceeding the radial extension of the second flangeportion 18. The mid-portion 22 may however have further variations in the radial extension or may have no further variations as shown in figures 3a and 3b.

The first and second outer circumferential surfaces 20, 21 are arranged at an angle being lessthan 90 degrees compared to the first side wall 5 and second side wall 6 respectively, with aradial increase towards the first side wall 5 and second side wall 6 respectively. Figures 3a-3dshow that the first and second outer circumferential surfaces 20, 21 are arranged at an anglebeing 90 degrees compared to the first side wall 5 and the second side wall 6 respectively, with a radial increase towards the first side wall 5 and second side wall 6 respectively.

Fig. 4a schematically shows a back view and outlet of one example of a device according to theinvention and fig. 4b schematically shows a perspective view of the device in figure 4a. Figures4a and 4b show that the first and second flange portions 18, 19 are arranged at a distance tothe counter-bearing 14 being small enough to encompass the entire profile product 2 suchthat the width of the profile product is defined and equal to the width ofthe mid-portion, i.e. the distance between the first and second flange portions 18, 19.

Fig. 4c schematically shows a back view and outlet of one example of a device according to theinvention and fig. 4d schematically shows a perspective view of the device in figure 4c. Figures4c and 4d show that the first and second flange portions 18, 19 are arranged at a distance to the counter-bearing 14 being big enough to allow material in the second channel portion 10 22 between the first and second flange portions 18, 19 and the counter bearing 14. Hence, thefirst and second flange portions 18, 19 encompass a part of the profile product 2 such that thewidth of a part ofthe profile product is defined and equal to the width ofthe mid-portion, i.e.the distance between the first and second flange portions 18, 19. This embodiment is suitablefor certain high viscosity materials, i.e. slow flowing materials, but may also be allowed ifthefirst and second flange portions 18, 19 are used in combination with further leakage protective strategies and means. ln figures 1-4, the first and second outer circumferential surfaces 20, 21 follow the contour ofthe mid-portion 22 and that the first and second flange portions 18, 19 are rotation symmetricabout an axis ofthe rotating die 3. Dependent on design and type of profile product to beproduced the flange portions 18, 19, can have different shape and be arranged non-symmetric as long as the flange portions 18, 19 effectively hinders movement of the material.

Figures 1 and 5-20 show further leakage protective strategies and means arranged for local pressure reduction in the first and second side portions 23, 25 of the rotating die 3.

Figure 1 shows that the rotating die 3 comprises annular recesses 29 arranged in connectionto the first and second flange portions 18, 19. This has the advantage of further hinderingmovement of material due to pressure reduction, which will be discussed further inconnection to figures 5-20. lt should be noted that in figures 5-20 the first and second flangeportions 18, 19 are not shown. lt should also be noted that the flange portions 18, 19 are notprerequisites for the annular recess 29, but the annular recess 29 can be arranged in therotating die 3 without the flange portions but in connection to the arrangement where thewidth ofthe first channel section 9 is, at least along a portion of its length and at least along aportion of its height, less than a distance between the two opposite side walls 5, 6 of the rotating die 3.

Fig. 5 schematically shows a cross-sectional side view of a device according to one exampleembodiment of the invention and fig. 6 schematically shows a back view and outlet of thedevice in figure 5. Figures 5 and 6 show that the first and/or second side portions 23, 25comprises an annular recess 29 extending in a radial direction R with an extension being less than a radial extension of at least a part ofthe mid-portion 22. 23The annular recesses 29 has a depth dependent on the material, design of rotating die,geometric shape of the first and second channel section, and can vary between anything fromone or more parts of a millimetre to a couple of centimetres, as long as the local pressure isdecreased enough to ensure prevention of leakage due to that the flow speed in the material is lowered.

Fig. 7 schematically shows a back view and outlet of a device according to the invention and fig. 8 schematically shows an enlarged view of a part of the device in figure 7.

Fig. 9 schematically shows a front view of one example of a rotary die, and fig. 10schematically shows a perspective view of the rotary die in figure 9. ln figures 9 and 10, themid-portion 22 of the rotary die is larger in diameter than the annular recesses 29 in the firstand second side portions 23, 25. ln figure 9, the recess 29 has a lesser radial extensioncompared to other parts of the rotating die 3 and a smooth transition from the mid-portion 22to the recess 29 and a continuous smooth curvature from the mid-portion 22 throughout therecess 29 to the respective first side wall 5 and second side wall 6. The recess 29 could bearranged in the form of a step function or in the form of an indentation, i.e. an annular recess.The indentation could be arranged in the form of a 90 degree step, but the step can bearranged as an angled portion as depicted but can also have an arc shape, e.g. a concaverecess. The angle of the angled portion can be between 1-90 degrees compared to the firstside wall 5 and second side wall 6 respectively, with a radial decrease towards the first side wall 5 and second side wall 6 respectively.

The recesses or indentations 29 could also be annular concave surfaces that gives a localpressure decrease with reference to the adjacent mid-portion 22. Any combination is possibleas long as the desired local pressure reduction compared to at least a part of the mid portion is achieved.

Fig. 11 schematically shows a front view of another example of a rotary die and fig. 12schematically shows a perspective view of the rotary die in figure 11. ln figures 11 and 12, themid-portion 22 of the rotary die has a portion that is lesser in diameter than the annularrecesses 29 in the first and second side portions 23, 25 but other portions of the mid portion22 has a greater diameter than the annular recesses 29 in the first and second side portions 23, 25. 24ln figures 1 and 5-20 it is shown that both the first and second side portions 23, 25 compriseannular recesses 29, but according to a different example (not shown) only one of the first and second side portions 23, 25 could comprise an annular recess 29.

Figures 1 and 5-20 show that at least a part/portion of the mid portion 22 has a diameter, i.e.an extension in the radial direction, being greater than the diameter, i.e. the extension in theradial direction, ofthe annular recess 29. One advantage of this difference in diameter is thatmaterial flowing in a direction towards the first side wall 5 and the second side wall 6 will losemomentum and speed due to the decrease in pressure in the annular recesses 29 in the first and second side portions 23, 25. ln figures 1 and 5-20 the recesses 29 follow the contour of the mid-portion 22 which has theadvantage of an even pressure decrease in that area. However, in another example notshown) it is possible to have annular recesses with varying diameter different from the mid-portion, or annular recesses being rotation symmetric when the mid-portion has non-rotation symmetric portions.

Figures 1 and 5-20 show that the recesses 29 are rotation symmetric about an axis of the rotating die 3, but as stated above, other design is possible.

Figure 5 shows that the walls 11 are static and define a first cross-section 12 at the end ofthefirst channel section 9 and wherein the second channel section 10 defines a second cross-section 17 at a position where the distance D2 between the circumferential surface 4 and thecounter-bearing 14 is at a minimum, and wherein the geometry ofthe first channel section 9 isdifferent from the second channel section 10 such that the material passing through the first channel section 9 changes form when entering the second channel section 10.

The minimum distance D2 in the height direction Z between the circumferential surface 4 andthe counter-bearing 14 in the second cross-section 17 is less than a maximum distance D1 inthe height direction in the first cross-section 12. This has the advantage of forcing the materialto change form and start flowing in various directions dependent on the shape and form of the rotating die 3 and shape and form of the counter-bearing 14 opposite the rotating die 3.

Due to the geometrical difference in the first channel section 9 and the second channel section 10, the pressure in the second channel section 10 is increased or maintained to such level that the material will transform fast enough to saturate the second channel section, including an imprint ofthe rotating die.

As stated in connection to the description of figs 1 and 5-20, the local pressure reduction isachieved in connection to the first and/or second side portions 23, 25 due to the geometricaldifference in the first and second channel sections 9, 10. The device 1 can be arranged withoutflange portions 18, 19 and annular recesses 29, but both the flange portions 18, 19 andannular recesses 29 are complementary strategies for leakage protection that gives added effect.

Figures 1 and 13-16 show strategies for local pressure reduction in combination with theannular recess(s) described in connection to figures 1 and 5-20. As stated above differentstrategies can be combined as shown in figure 1 where the device 1 comprises flange portions18, 19 and recesses 29. However, the strategies for local pressure reduction described aboveand in connection to figures 1 and 13-16 can be arranged without the flange portions and anfiUlal' FeCeSSeS.

Fig. 13 schematically shows a view from below along section A-A in figure 2 without the flangeportions of a device according to the invention and fig. 14 schematically shows an enlargedview of a part of the device in figure 13. Fig. 15 schematically shows a view from below alongsection A-A in figure 2 without the flange portions of a device according to one example of the invention and fig. 16 schematically shows an enlarged view of a part of the device in figure 15. ln figures 1 and 13-16 the first channel section 9 comprises a third side portion 24 extending inthe width direction X, wherein the third side portion 24 is arranged in relation to the first sideportion 23 such that a pressure in the material to be extruded is less in connection to the first side portion 23 than in connection to the third side portion 24,and/or wherein the first channel section 9 comprises a fourth side portion 26 extending in the widthdirection X, wherein the fourth side portion 26 is arranged in relation to the second sideportion 25 such that a pressure in the material to be extruded is less in connection to the second side portion 25 than in connection to the fourth side portion 26. 26 Figures 1 and 13-16 shows that the first channel section 9 comprises leeward means 27 inconnection to the third and/or fourth side portions 24, 26 arranged to decrease the space ofthe first channel section 9 in the height direction Z being perpendicular to the width directionX and wherein the first channel section 9 comprises leeward means 28 in connection to thethird and/or fourth side portions 24, 26 arranged to decrease the space of the first channel section 9 in the width direction X.

As is shown in figures 1 and 13-16, the leeward means 27, 28 comprises elevations facing into the through channel 8.

With reference to figures 1-16, the second channel section 10 is advantageously arranged inrelation to the first channel section 9 with a predetermined second distance D2, shown infigure 5, between the radially outermost portion of the circumferential surface 4 oftherotating die 3 and the counter-bearing 14 in the channel portion 13 being less than apredetermined first distance D1, shown in figure 5, between the most far apart portions of the first channel section 9 taken in a height direction Z coinciding with the radial direction,and/or wherein: the second channel section 10 is arranged in relation to the first channel section 9 with apredetermined fourth distance D4, shown in figure 15, between the innermost narrowestportions of the channel portion 13 in the width direction X being greater than apredetermined third distance D3, shown in figure 15, between side walls in the first channelsection taken in the width direction X at the exit area from the first channel. This change inboth height and width forces the material to reform and the narrower first channel sectiongives a locally decreased pressure when entering the channel section since the first and second side portions are in the wake, i.e. behind the side walls in the first channel.

Furthermore, with reference to figures 1-16 the first and second side walls 5, 6 are positionedin relation to the first and second channel portion side walls 15, 16 such that the first andsecond side walls 5, 6 are rotatably connected to the first and second channel portion sidewalls 15, 16 with a tolerance arranged dependent on product material and the geometrical relation between the first and second channel sections 9, 10 27The circumferential surface 4 may comprises a textured portion 30 that can cover all therotating die but the annular recess portion, or the first side portion 4 comprises a non-textured portion 31 extending between the first flange portion 18 and the textured portion 30and wherein the second side portion 25 comprises a non-textured portion 32 between the second flange portion 19 and the textured portion 30.

The non-textured portions 31, 32 advantageously has a radius less than a radius to an imprint depth of the textured portion 30, especially in the annular recess 19 portion.

However according to one example (not shown), the circumferential surface 4 can be non-textured but with a smooth surface or a micro-patterned surface. The non-textured rotating die can have a shape being cylindrical or undulating.

Fig. 17 schematically shows a back view and outlet of an assembly of rotary dies 3 includingthree rotary dies, 3, 33, 34 and fig. 18 schematically shows a perspective view of an assemblyaccording to figure 14. With references to figures 1-16, the channel portion 13 comprises asecond rotating die 33 arranged opposite the first rotating die 3 replacing the counter-bearing14 in figures 1-16. The second rotating 33 die can either replace the counter-bearing 14 in itsentirety or can be a part of a static counter-bearing 14 (not shown). The second rotating 33 diecan be arranged in a similar way as the above described first rotating die 3 to create same ordifferent patterns on two sides of the profile product. The second rotating die 33 can compriseannular recesses and/or flange portions that can be arranged to cooperate with annular recesses 29 and/or flange portions 18, 19 of the first rotating die 3.

According to one example shown in figures 17 and 18, the channel portion 13 (shown infigures 1-16) comprises a third rotating die 34 arranged at an angle to the first rotating die.This rotating die replaces the opposing first or second channel portion side wall 15, 16 entirelyor partly. The third rotating die 34 can be arranged together with only the first rotating die ortogether with both the first and second rotating die. Hence, the above described arrangementwith a first rotating die 3 and a second opposing rotating die 33 can be assembled without the third rotating die 34.

Fig. 19 schematically shows a back view and outlet of an assembly of rotary dies including four rotary dies, and wherein and fig. 20 schematically shows a perspective view of an assembly 28according to figure 19. Figures 19 and 20 show that the channel portion 13 (shown in figures1-16) comprises a fourth rotating die 35 arranged opposite the third rotating die 34. Thefourth rotating die 34 can as an alternative be arranged together with only the first rotating die 3 or together with both the first and second rotating die 3, 33.

The third and/or the fourth rotating die(s) 34, 35 can be arranged in a similar way as the abovedescribed first rotating die 3 to create same or different patterns on two sides of the profileproduct. The third and/or fourth rotating dies 34, 35 can comprise annular recesses and/orflange portions that can be arranged to cooperate with annular recesses 29 and/or flange portions 18, 19 of the first rotating die 3.

According to one example, two or more rotating dies are synchronised. This has the advantageof feeding the material at the same speed. However, it could be possible to also use non-synchronous rotating dies in order to create friction and/or a special pattern and/or to compensate for material differences.

The device can be arranged with a combination of textured and non-textured rotating dies 3; 33; 34; 35.

Figure 21 schematically shows a flow chart of a method for producing a profile product by useof a device according to what has been described in connection to figures 1-21, wherein the method comprisesthe step shown in Box 101 -feeding a material to the first channel section and forming the same in the first channel section,And the step shown in Box 102 - feeding the material further to the second channel section and forming the same in the second channel section.

The figures showing recesses 29 show that the first and second side portions 23, 25 comprisesan annular recess. According to one example, not shown, only one of the first or second sideportions 23, 25 comprises a recess. ln figures 1-18, the recesses are annular recesses, i.e. extending circumferentially about the rotational axis. According to one example, not shown, 29 the first and/or second side portions comprises one or more recesses not being annular butarranged as one ore many single recesses. Each single recess has an extension in the widthdirection, the rotation direction, i.e. the circumferential direction being perpendicular to thewidth direction, and the radia| direction. The single recesses can have similar or differentshape and are advantageously. The single recesses can be arranged in different patternsextending circumferentially about the rotational axis. The single recesses can be arranged inone single line of recesses extending circumferentially about the rotational axis or can bearranged as two or more lines of recesses arranged next to each other in the width direction.The two or more lines of recesses can be arranged such that one or more are arranged next toeach other in the width direction or offset to each other in the circumferential direction. The different lines of single recesses can have same or different number of recesses.

The figures that show the first and second flange portions 18, 19 show that, the first and/orsecond outer circumferential surfaces 20, 21 are arranged with a smooth annular shape, i.e.the first and/or second flange portions are arranged with a circular or oval shape, butaccording to another example the first and/or second outer circumferential surfaces arearranged in an undulating manner, i.e. the first and/or second flange portions are arranged with a cogwheel like shape.

Claims

1. CLAll\/IS 1. An extrusion and/or pultrusion device (1) for forming a profile product (2) in a productiondirection (Y), said device comprising: -a rotating die (3), extending in a radia| (R) direction and a width direction (X), having twoopposite first and second side walls (5, 6) and an outer circumferential surface (4) extending inthe width direction (X) there between, wherein the rotating die (3) comprises a first sideportion (23) in connection to the first side wall (5) and a second side portion (25) in connectionto the second side wall (6) and a mid-portion (22) extending between the first and second sideportions (23, 25), and -a profile definition zone (7) having a longitudinal direction (Y) coinciding with the productiondirection (Y), a height direction (Z) and a width direction (X) being perpendicular to the heightdirection (Z), comprising a through channel (8) comprising a first channel section (9) followedby a second channel section (10) downstream the first channel section (9) with reference tothe production direction, wherein the rotating die (3) is rotatable about an axis extending across the productiondirection (Y) and arranged to allow the outer circumferential surface (4) to, while the rotatingdie (3) rotates, exert a pressure onto a surface ofthe material when fed through the profiledefinition zone (7), wherein;-the first channel section (9) is circumferentially delimited by one or more walls (11)and wherein- the second channel section (10) is circumferentially delimited by-the circumferential surface (4) ofthe rotating die (3) and-a channel portion (13) comprising-a counter-bearing (14) opposite the rotating die (3) and -opposing first and second channel portion side walls (15, 16)between the rotating die (3) and the counter-bearing (14) characterized in that the width (D3) of the first channel section (9) is, at least along a portion of its length and atleast along a portion of its height, less than a distance (D4) between the two opposite sidewalls (5, 6) ofthe rotating die (3), and in that 31 the first and/or second side portions (23, 25) comprises one or more recesses (29) extendingin the width direction (X) and in the radial direction (R) with an extension in the radialdirection being less than a radial extension of at least a part ofthe mid-portion (22).

2. A device according to claim 1, wherein local pressure reduction is achieved in connection tothe first and second outer edge portions (5, 6) due to the geometrical difference in the firstand second channel sections (9, 10).

3. A device (1) according to any one any one of the preceding claims, wherein the one or morewalls (11) define a first cross-section (12) at the end of the first channel section (9) andwherein the second channel section (10) defines a second cross-section (17) at a positionwhere the distance between the circumferential surface (4) and the counter-bearing (14) is ata minimum, and wherein the geometry of the first channel section (9) is different from thesecond channel section (10) such that the material passing through the first channel section(9) changes form when entering the second channel section (10).

4. A device (1) according to claim 3, wherein the minimum distance in the height direction (Z)between the circumferential surface (4) and the counter-bearing (14) in the second cross-section (17) is less than a maximum distance in the height direction in the first cross-section(12).

5. A device (1) according to any one of the preceding claims, wherein the geometricaldifference in the first and second channel sections (9, 10) is arranged to give a pressure in thesecond channel section (10) being increased or maintained to such level that the material willtransform fast enough to saturate the second channel section (10), including an imprint of therotating die.

6. A device (1) according to any one of the preceding claims, wherein the first channel section(9) comprises a third side portion (24) extending in the width direction (X), wherein the thirdside portion (24) is arranged in relation to the first side portion (23) such that a pressure in thematerial to be extruded is less in connection to the first side portion (23) than in connection tothe third side portion (24) , and/or wherein the first channel section (9) comprises a fourth side portion (26) extending in thewidth direction (X), wherein the fourth side portion (26) is arranged in relation to the secondside portion (25) such that a pressure in the material to be extruded is less in connection tothe second side portion (25) than in connection to the fourth side portion (26).

7. A device (1) according to claim 6, wherein the first channel section (9) comprises leewardmeans (27) in connection to the third and/or fourth side portions (24, 26) arranged todecrease the space of the first channel section (9) in the height direction (Z) beingperpendicular to the width direction (X). 32

8. A device (1) according to claim 6 or 7, wherein the first channel section (9) comprisesleeward means (28) in connection to the third and/or fourth side portions (24, 26) arranged todecrease the space of the first channel section (9) in the width direction (X).

9. A device (1) according to claim 7 or 8, wherein the leeward means (27, 28) is an elevationfacing into the through channel (8).

10. A device (1) according to any one of the preceding claims, wherein the second channelsection (10) is arranged in relation to the first channel section (9) with a predeterminedsecond distance (D2) between the radially outermost portion of the circumferential surface (4)of the rotating die (3) and the counter-bearing (14) in the channel portion (13) being less thana predetermined first distance (D1) between the most far apart portions of the first channelsection (9) taken in a height direction (Z) coinciding with the radial direction, and/or wherein: the second channel section (10) is arranged in relation to the first channel section (9) with apredetermined fourth distance (D4) between the innermost narrowest portions ofthe channelportion (13) in the width direction (X) being greater than a predetermined third distance (D3),between side walls in the first channel taken in the width direction (X) at the exit area fromthe first channel section (9).

11. A device according to any one of the preceding claims, wherein the first and second sidewalls (5, 6) are positioned in relation to the first and second channel portion side walls (15, 16)such that the first and second side walls (5, 6) are rotatably connected to the first and secondchannel portion side walls (15, 16) with a tolerance arranged dependent on product materialand the geometrical relation between the first and second channel sections (9, 10)

12. A device (1) according to any one of the preceding claims, wherein the first side portion(23) comprises a first flange portion (18) extending in the width direction (X) and in the radialdirection (R) with an extension in the radial direction (R) exceeding the radial extension of atleast a part ofthe mid-portion (22) and wherein the second side portion (25) comprises asecond flange portion (19) extending the width direction (X) and in the radial direction (R) withan extension in the radial direction (R) exceeding the radial extension of at least a part of themid-portion (22).

13. A device (1) according to claim 12, wherein the first flange portion (18) comprises a firstouter circumferential surface (20) delimiting the first flange portion (18) in the rotationaldirection (R) and wherein the second flange portion (19) comprises a second outercircumferential surface (21) delimiting the second flange portion (19) in the rotationaldirection.

14. A device (1) according to any one of claims 12 or 13, wherein the first and second outercircumferential surfaces (20, 21) follow the contour ofthe mid-portion (22). 33

15. A device (1) according to any one claims 12-14, wherein the first and second flange portions (18) are rotation symmetric about an axis of the rotating die (3).

16. A device (1) according to any one of the preceding claims, wherein the recess (29) followthe contour of the mid-portion (22).

17. A device (1) according to any one of the preceding claims, wherein the recess (29) arerotation symmetric about an axis of the rotating die (3).

18. A device (1) according to any one of the preceding claima, wherein the recess is either anindentation in the rotating die (3) or a portion ofthe rotating die (3) having a lesser radia|extension compared to other parts of the rotating die.

19. A device (1) according to any one of the preceding claims, wherein the circumferentialsurface (4) comprises a textured portion (30).

20. A device (1) according to claim 19, wherein the first side portion (4) comprises a non-textured portion (31) extending between the first side wall (5) and the textured portion (30)and wherein the second side portion (25) comprises a non-textured portion (32) between thesecond side wall (6) and the textured portion (30).

21. A device (1) according to claim 20, wherein the non-textured portions (31, 32) have aradius less than a radius to an imprint depth ofthe textured portion 30.

22. A device (1) according to any one of claims 1-18, wherein the circumferential surface (4) isnon-textured.

23. A device (1) according to any one ofthe preceding claims, wherein the channel portion(13) comprises a second rotating die (33) arranged opposite the first rotating die (3).

24. A device (1) according to any one of the preceding claims, wherein the channel portion(13) comprises a third rotating die (34) arranged at an angle to the first rotating die (3).

25. A device (1) according to claim 24, wherein the channel portion (13) comprises a fourth rotating die (35) arranged opposite the third rotating die (34).

26. A device according to any one of claims 23-25, wherein two or more rotating dies (3; 33; 34; 35) are synchronised.

27. A device according to any one of the preceding claims 23-26, comprising a combination of textured and non-textured rotating dies (3; 33; 34; 35).

28. A device (1) according to any one of the preceding claims, wherein the first channel section (9) is circumferentially delimited by static walls (11). 34

29. A method for producing a profile product by use of a device according to any one of the preceding claims, wherein the method comprises -feeding a material to the first channel section and forming the same in the first channel section, - feeding the material further to the second channel section and forming the same in the second channel section.