Peel ply and pultrusion device

Abstract

The present application provides a peel ply and a pultrusion device. The peel ply comprises a fluorine-containing material layer, wherein the raw materials of the fluorine-containing material layer comprise a fluorine-containing high polymer film material, and at least one side surface of the fluorine-containing material layer has preset surface roughness Ra. The raw materials of the fluorine-containing material layer of the peel ply comprise a fluorine-containing high polymer, and due to the presence of a fluorine element, good smoothness of the peel ply is achieved, and the resistance on the fluorine-containing material layer during advancing thereof along with impregnated fibers in a heated mold cavity can be effectively reduced, thereby facilitating later demolding. Additionally, by using the fluorine-containing high polymer as a film material, the peel ply of the present application has tensile and compressive properties, thereby effectively avoiding the problem of the contamination to a pultruded profile caused by falling of debris of the film material during peeling-off or the residual debris of the film material on the surface of the profile, mitigating the problems of unstable edge margin, edge folding, wrinkling, inclusion, debonding and the like of the peel ply, and facilitating the production of profiles such as wind power blades.

Description

Release cloth and pultrusion equipment TECHNICAL FIELD

[0001] The present application relates to the field of release cloth, in particular to a release cloth and a pultrusion equipment. BACKGROUND

[0002] As a composite material forming process, pultrusion is highly valued in the composite material industry due to high automation, high product yield and high raw material utilization rate. In recent years, due to the rapid development of the wind power industry, the main beam (also known as beam cap or girder) of the wind power blade is the main load-bearing member or main structural member of the wind power blade. At present, the main beam is mostly made of pultruded profiles (thickness usually 5mm, mainly including pultruded glass plate and pultruded carbon plate) of a certain thickness.

[0003] In order to ensure the bonding effect of the pultruded profile and the blade in the subsequent pouring process, release cloth is usually laid on the upper and lower surfaces of the profile during the pultrusion forming process, and then removed in the post-processing process to ensure the roughening of the surface of the pultruded profile. However, there are some problems in the production of release cloth, such as unstable release cloth edge distance, edge covering, wrinkling, inclusion and debonding. In addition, the use and subsequent removal of the release cloth increase the manufacturing cost of the pultruded profile.

[0004] SUMMARY

[0005] The embodiments of the present application provide a release cloth and a pultrusion equipment, which can improve the problems of unstable release cloth edge distance, edge covering, wrinkling, inclusion and debonding.

[0006] In a first aspect, the embodiments of the present application provide a release cloth, which comprises a fluorine-containing material layer, the fluorine-containing material layer is prepared from a fluorine-containing polymer film material, the radial tensile strength of the fluorine-containing material layer is ≥1500N, the weft tensile strength of the fluorine-containing material layer is ≥1200N, and at least one side surface of the fluorine-containing material layer has a preset surface roughness Ra.

[0007] According to the embodiments of the first aspect of the present application, the release cloth further comprises a substrate layer, the substrate layer is located on one side surface of the fluorine-containing material layer, and the side of the fluorine-containing material layer away from the substrate layer has a preset surface roughness Ra.

[0008] According to the embodiments of the first aspect of the present application, the raw material of the substrate layer comprises at least one of polyamide and polyester fiber.

[0009] According to the embodiments of the first aspect of the present application, the raw material of the fluorine-containing material layer comprises at least one of fluoroelastomer 23, fluoroelastomer 26, fluoroelastomer 246, perfluoroether rubber, polyvinylidene fluoride, polyperfluoroethylene propylene and polytrifluorochloroethylene.

[0010] According to the embodiments of the first aspect of the present application, the preset surface roughness Ra is in the range of Ra≥8um.

[0011] In a second aspect, the embodiments of the present application provide a pultrusion device, comprising: a feeding device configured to provide a fiber; a forming die configured to solidify the fiber into a profile; a traction system configured to move the profile; a release cloth and a release cloth transmission device, the release cloth adopts the release cloth described above and has a closed annular structure, the release cloth is sleeved on the release cloth transmission device to form a circulation loop, and the release cloth is configured to move with the profile and form a preset surface roughness Ra on at least one side surface of the profile in a direction perpendicular to a thickness of the profile, and the release cloth transmission device is configured to drive the release cloth to rotate.

[0012] According to the embodiments of the second aspect of the present application, the release cloth comprises a first annular release cloth and a second annular release cloth, and the release cloth transmission device comprises a first transmission group and a second transmission group.

[0013] The first transmission group comprises a first guide roller, a first supporting roller and a second guide roller, the first guide roller is arranged at an inlet of the forming die, the second guide roller is arranged at an outlet of the forming die, the first supporting roller is arranged between the first guide roller and the second guide roller, and the first annular release cloth forms a first circulation loop when sleeved on the first transmission group.

[0014] The second transmission group comprises a third guide roller, a second supporting roller and a fourth guide roller, the third guide roller is arranged at the inlet of the forming die, the fourth guide roller is arranged at the outlet of the forming die, the second supporting roller is arranged between the third guide roller and the fourth guide roller, and the second annular release cloth forms a second circulation loop when sleeved on the second transmission group, and circulation directions of the first circulation loop and the second circulation loop are opposite.

[0015] According to the embodiments of the second aspect of the present application, the first guide roller and the third guide roller are symmetrically distributed along a straight line where a movement direction of the profile is located; the second guide roller and the fourth guide roller are symmetrically distributed along the straight line where the movement direction of the profile is located; and the first supporting roller and the second supporting roller are symmetrically distributed along the straight line where the movement direction of the profile is located.

[0016] According to the embodiments of the second aspect of the present application, the first guide roller and the first supporting roller are located in the same plane in a direction perpendicular to the movement direction of the profile, or the first guide roller and the second guide roller are located in the same plane in the direction perpendicular to the movement direction of the profile.

[0017] The third guide roller and the second supporting roller are located in the same plane in the direction perpendicular to the movement direction of the profile, or the third guide roller and the fourth guide roller are located in the same plane in the direction perpendicular to the movement direction of the profile.

[0018] According to the embodiments of the second aspect of the present application, the device further comprises a support frame configured to support the release cloth transmission device.

[0019] Compared with the prior art, the present application has at least the following beneficial effects:

[0020] The release cloth of the embodiment of the present application comprises a fluorine-containing material layer, the raw material of the fluorine-containing material layer comprises a fluorine-containing polymer film material, and at least one side surface of the fluorine-containing material layer has a preset surface roughness Ra. The raw material of the fluorine-containing material layer of the release cloth comprises a fluorine-containing polymer. Due to the presence of fluorine elements, the smoothness of the release cloth itself is better, which can ensure that the side surface of the fluorine-containing material layer close to the cavity is smooth when the fluorine-containing material layer is applied to the pultrusion equipment, effectively reducing the resistance of the fluorine-containing material layer during the advancement of the impregnated fiber in the heated mold cavity, and being beneficial to the later release. At the same time, the fluorine-containing polymer as a film material makes the release cloth of the present application have the properties of tensile and compressive resistance, which can effectively avoid the pollution of the pultruded profile caused by the falling debris of the film material or the residual debris of the film material on the surface of the profile during the tearing process. It can solve the problems of unstable edge distance, edge covering, wrinkles, inclusions and debonding of the release cloth, so as to facilitate the production of profiles such as wind power blades. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by the drawings without creative labor for those skilled in the art.

[0022] Fig. 1 is a schematic diagram of a pultrusion equipment according to an embodiment of the present application.

[0023] Reference signs: 10, feeding device; 11, impregnated fiber; 20, forming mold; 21, profile; 30, traction system; 40, release cloth; 41, first annular release cloth; 42, second annular release cloth; 50, release cloth transmission device; 51, first transmission group; 52, first guide roller; 53, first supporting roller; 54, second guide roller; 55, second transmission group; 56, third guide roller; 57, second supporting roller; 58, fourth guide roller; 60, supporting frame. DETAILED DESCRIPTION

[0024] In order to make the application purpose, technical solutions and beneficial technical effects of the present application more clear, the following will further describe the present application in combination with embodiments. It should be understood that the embodiments described in the present specification are only for explaining the present application, and are not intended to limit the present application.

[0025] For simplicity, only some numerical ranges are explicitly recited herein. However, any lower limit can be combined with any upper limit to form a range not explicitly recited; and any lower limit can be combined with any other lower limit to form a range not explicitly recited, and likewise any upper limit can be combined with any other upper limit to form a range not explicitly recited. Further, although a range is recited, it is to be understood that every point or individual number within the range is also specifically disclosed. Thus, for example, every point or individual number within the range is expressly stated to be the lower limit of a range and the upper limit of another range. Any numerical range recited herein is intended to include all sub-ranges subsumed therein. For example, a range of "1 to 10" is intended to include all sub-ranges between and including the minimum value of 1 and the maximum value of 10; that is, all sub-ranges beginning with a minimum value equal to or greater than 1 and ending with a maximum value equal to or less than 10, and all sub-ranges beginning with a minimum value equal to or greater than 1 and ending with a maximum value equal to or less than 10, as well as all sub-ranges for multiples of the same increments established by the minimum and maximum values. The same applies to all ranges recited herein.

[0026] In the description of the present application, it should be noted that, unless otherwise specified, "above", "below" are inclusive of the number, and the meaning of "multiple" in "one or more" is two and more than two.

[0027] The foregoing summary of the application is not intended to describe every disclosed embodiment or implementation of the present application. The following description more specifically illustrates example embodiments. Throughout this application, guidance is provided by a series of examples that can be used in various combinations. In each instance, the recitation is merely representative of a group and should not be interpreted as exhaustive.

[0028] At present, the pultruded profile 21, such as a wind power blade, usually lays release cloth on the upper and lower surfaces during the pultrusion of the profile 21, and then tears it off in the post-processing process. The following problems exist in the production using the release cloth at present: unstable release cloth to the edge margin, edge covering, wrinkles, inclusions and debonding, etc. In addition, the use and subsequent tearing of the release cloth increase the manufacturing cost of the pultruded profile 21.

[0029] In view of the above problems, the present application provides a release cloth, which can realize the recycling use of the release cloth, and the tearing process of the pressing film material is completed synchronously after the profile 21 leaves the mold, so that continuous production can be realized, the production efficiency is high, and the post-processing process of re-winding and tearing the release cloth after the wound profile 21 reaches the blade factory is effectively avoided. The technical solutions provided by the present application are described in detail below.

[0030] Release cloth

[0031] In a first aspect, the embodiments of the present application provide a release cloth, which comprises a fluorine-containing material layer, the raw material of the fluorine-containing material layer comprises a fluorine-containing polymer film material, and at least one side surface of the fluorine-containing material layer has a preset surface roughness Ra.

[0032] The release cloth in the embodiment of the present application comprises a fluorine-containing material layer, wherein the raw material of the fluorine-containing material layer at least comprises a fluorine-containing polymer. The fluorine-containing polymer film material is smooth due to the presence of fluorine elements, which can ensure that the surface of the fluorine-containing material layer close to the cavity is smooth when applied to the pultrusion equipment, and can effectively reduce the resistance of the fluorine-containing material layer during the advancement of the impregnated fiber in the heated mold cavity, which is beneficial to the later release. At the same time, the fluorine-containing polymer as a film material forms the fluorine-containing material layer, so that the release cloth of the embodiment of the present application has tensile and compressive properties, which can effectively avoid the pollution of the pultruded profile caused by the falling of film material debris or the residual film material debris on the surface of the profile during the tearing process, and can solve the problems of unstable edge distance, edge covering, wrinkles, inclusions and debonding of the release cloth. At least one side surface of the fluorine-containing material layer has a predetermined surface roughness Ra, so that the surface of the pultruded profile has a predetermined surface roughness Ra.

[0033] In the embodiment of the present application, various functional fillers with high temperature resistance and tensile and compressive resistance can be added to the fluorine-containing polymer film material during the forming process, but the present application is not limited thereto.

[0034] In some embodiments, the radial tensile strength of the fluorine-containing material layer is ≥1500N, and the weft tensile strength of the fluorine-containing material layer is ≥1200N.

[0035] It should be noted that in the present application, the length direction of the release cloth during use is the radial direction, and the width direction is the weft direction. In the embodiment of the present application, the radial tensile strength of the fluorine-containing material layer is ≥1500N, and the weft tensile strength is ≥1200N. The release cloth has good compressive resistance, and after the film material passes through the heated mold with the profile, the film material needs to be separated from the already solidified profile by mechanical force. The compressive resistance of the fluorine-containing polymer film material can ensure the integrity of the film material during the separation process, which not only ensures the recycling of the release cloth, but also effectively avoids the pollution of the pultruded profile caused by the falling of release cloth debris or the residual film material debris on the surface of the profile during the tearing process, and solves the problems of unstable edge distance, edge covering, wrinkles, inclusions and debonding of the release cloth.

[0036] In the technical solution of the present application, the traditional PA66 release cloth is replaced by a recyclable fluorine-containing polymer film material. The fluorine-containing material layer can be made into a closed ring structure and fitted on the pultrusion equipment. The improved release cloth realizes recycling, and effectively avoids the increase of labor cost and release cloth cost caused by tearing the release cloth during the post-processing of the profile. Therefore, the labor, production and management costs are greatly saved.

[0037] The fluorine-containing high polymer film material used in the technical solution of the present application is torn off at the die outlet, which provides convenient conditions for the online visual monitoring system and online nondestructive testing technology in the pultrusion profile production process, fully exposes the profile to be tested in the detection system, improves the recognition of the detection system, effectively avoids the occurrence of batch waste, and greatly improves the utilization rate of raw materials.

[0038] In addition, in order to make the release cloth have good temperature resistance, the thermal deformation temperature of the fluorine-containing material layer in the embodiment of the present application is higher than 220 DEG C. In the profile production process, the fluorine-containing material layer does not deform due to high mold temperature during the advancement of the impregnated fiber in the heated mold cavity, ensuring the stability of the profile surface roughness and the recyclable ability of the release cloth.

[0039] The embodiment of the present application also provides a production method of the release cloth. A certain ratio of fluorine-containing high polymer film material is pressed into a fluorine-containing material layer with pressure resistance, heat resistance, tear resistance and rough surface by using a base film under high temperature and high pressure through a molding technology. Exemplarily, the temperature of the high temperature is 160-200 DEG C, the pressure of the high pressure is 30-50 Mpa, and the thickness of the fluorine-containing material layer is 0.8-1.5 mm. In some embodiments, the base film can provide roughness for the fluorine-containing material layer. At this time, the cavity surface of the molding die is smooth to facilitate the release of the fluorine-containing material layer. After the base film is separated from the fluorine-containing material layer, a fluorine-containing material layer with smooth one side surface and rough one side surface is obtained.

[0040] Exemplarily, the base film can be nylon PA66.

[0041] The release cloth in the embodiment of the present application can only include the fluorine-containing material layer. In some embodiments, the release cloth also includes a substrate layer, the substrate layer is located on one side surface of the fluorine-containing material layer, and the side of the fluorine-containing material layer away from the substrate layer has a preset surface roughness Ra.

[0042] In the embodiment of the present application, the release cloth also includes a substrate layer, and the substrate layer and the fluorine-containing material layer are stacked. The substrate layer can enhance the strength of the release cloth. The side of the fluorine-containing material layer away from the substrate layer has a preset surface roughness Ra, and the surface with the preset surface roughness Ra is used to contact the impregnated fiber to ensure that the surface of the pultrusion profile has a preset surface roughness Ra.

[0043] The embodiment of the present application can press a certain ratio of fluorine-containing high polymer film material into a fluorine-containing material layer with pressure resistance, heat resistance, tear resistance and rough surface by using a substrate layer under high temperature and high pressure through a molding technology. Exemplarily, the temperature of the high temperature is 160-200 DEG C, the pressure of the high pressure is 30-50 Mpa, and the thickness of the fluorine-containing material layer is 0.8-1.5 mm. In some embodiments, the cavity surface of the molding die is rough to provide roughness for the fluorine-containing material layer.

[0044] In some embodiments, the raw material of the substrate layer comprises at least one of polyamide and polyester fiber.

[0045] In some embodiments, the raw material of the fluorine-containing material layer comprises at least one of fluoroelastomer 23, fluoroelastomer 26, fluoroelastomer 246, perfluoroether rubber, polyvinylidene fluoride, polyperfluoroethylene propylene, and polytrifluorochloroethylene.

[0046] In some embodiments, the preset surface roughness Ra is in the range of Ra≥8um.

[0047] In the embodiments of the present application, the preset surface roughness Ra is in the above range, which can ensure that the surface of the pultruded profile 21 has a surface roughness Ra≥8um, so as to increase the bonding force in the blade cavity later.

[0048] Pultrusion device

[0049] In the second aspect, referring to FIG. 1, the present application provides a pultrusion device, which comprises: a feeding device 10 for providing impregnated fibers; a forming die 20 for curing the impregnated fibers into a profile 21; a traction system 30 for moving the profile 21; a release cloth and a release cloth transmission device 50, the release cloth 40 adopts the release cloth in the first aspect and has a closed annular structure, the release cloth is sleeved on the release cloth transmission device 50 to form a circulation loop, which is used to move with the profile 21 and form a preset surface roughness Ra on at least one side surface of the profile 21 in the vertical direction of the thickness of the profile 21, and the release cloth transmission device 50 is used to drive the release cloth to rotate.

[0050] The present application selects a prefabricated release cloth formed by a fluorine-containing polymer film material, which enters the forming die synchronously with the impregnated fiber yarn during the production process of the profile 21, completes the pressing process of the rough surface during the profile 21 forming process, and synchronously completes the tearing process of the pressed film material after the profile 21 leaves the die, which can realize continuous production, has high production efficiency, and effectively avoids the post-processing process of rewinding and tearing the release cloth after the profile 21 reaches the blade factory.

[0051] The forming die 20 is stationary relative to the ground, mounted on a fixed tooling, and does not undergo any displacement. The release cloth is continuously advancing in the mold cavity with the impregnated fiber at a certain linear speed. The release cloth and the impregnated fiber in the mold cavity are relatively stationary. The impregnated fiber enters the heated forming die 20 from the mold inlet. The glue impregnated on the fiber undergoes a curing reaction due to heating in the mold and is cured and bonded with the fiber. At the mold outlet of the forming die 20, the impregnated fiber is output in the form of a pultruded profile 21 together with the release cloth. After being output at the mold outlet, the release cloth 40 is separated from the forming die 20. The release cloth 40 is driven by the release cloth driving device 50 to enter the next production cycle. In the technical solution of the present application, an online circulation system is adopted, which facilitates engineering production and provides convenient conditions for process improvement and production speed-up of subsequent pultruded glass plates and pultruded carbon plates. The production speed can reach 1.2 m / min, and the production efficiency is greatly improved.

[0052] In some embodiments, referring to Fig. 1, the release cloth 40 includes a first annular release cloth 41 and a second annular release cloth 42, and the release cloth driving device 50 includes a first driving group 51 and a second driving group 55.

[0053] The first driving group 51 includes a first guide roller 52, a first support roller 53, and a second guide roller 54. The first guide roller 52 is arranged at the mold inlet of the forming die 20, the second guide roller 54 is arranged at the mold outlet of the forming die 20, and the first support roller 53 is arranged between the first guide roller 52 and the second guide roller 54. When the first annular release cloth 41 is sleeved on the first driving group 51, a first circulation loop is formed.

[0054] The second driving group 55 includes a third guide roller 56, a second support roller 57, and a fourth guide roller 58. The third guide roller 56 is arranged at the mold inlet of the forming die 20, the fourth guide roller 58 is arranged at the mold outlet of the forming die 20, and the second support roller 57 is arranged between the third guide roller 56 and the fourth guide roller 58. When the second annular release cloth 42 is sleeved on the second driving group 55, a second circulation loop is formed. The circulation directions of the first circulation loop and the second circulation loop are opposite.

[0055] The first guide roller 52, the first supporting roller 53 and the second guide roller 54 constitute the first transmission group 51 in the embodiment of the application, the first guide roller 52, the first supporting roller 53 and the second guide roller 54 rotate in the same clockwise direction, the first guide roller 52 is arranged at the mold inlet of the forming mold 20, the movement direction of the first annular release cloth 41 at the first guide roller 52 can be changed through the self-rotation of the first guide roller 52, so that the first annular release cloth 41 enters the forming mold 20 following the impregnated fiber, the second guide roller 54 is arranged at the mold outlet of the forming mold 20, the movement direction of the first annular release cloth 41 at the second guide roller 54 can be changed through the self-rotation of the second guide roller 54, so that the first annular release cloth 41 is separated from the profiled material 21, the first supporting roller 53 is arranged between the first guide roller 52 and the second guide roller 54, and is used for supporting the first annular release cloth 41, assisting the first annular release cloth 41 to smoothly reverse at the first guide roller 52 and the second guide roller 54, lengthening the use length of the first annular release cloth 41, and being beneficial to the segmented work of the first annular release cloth 41 and improving the service life.

[0056] The first annular release cloth 41 forms a first circulation loop when being sleeved on the first transmission group 51, in the production process of the profiled material 21, the first annular release cloth 41 enters the heated forming mold 20 from the mold inlet along with the impregnated fiber, the impregnated glue on the fiber is cured and bonded with the fiber together due to the heat in the mold, and the profiled material 21 in the form of a pultruded profile is output together with the first annular release cloth 41 at the mold outlet of the forming mold 20, after being output at the mold outlet, the first annular release cloth 41 is separated from one side surface of the profiled material 21 through the transmission of the first transmission group 51, and the first annular release cloth 41 enters the next production cycle following the transmission of the first transmission group 51.

[0057] The third guide roller 56, the second supporting roller 57 and the fourth guide roller 58 constitute a second transmission group 55 in the embodiment of the application, the third guide roller 56, the second supporting roller 57 and the fourth guide roller 58 rotate in the same clockwise direction, the third guide roller 56 is arranged at the mold inlet of the forming mold 20, the movement direction of the second annular release cloth 42 at the third guide roller 56 can be changed through the self-rotation of the third guide roller 56, so that the second annular release cloth 42 enters the forming mold 20 following the impregnated fiber, the fourth guide roller 58 is arranged at the mold outlet of the forming mold 20, the movement direction of the second annular release cloth 42 at the fourth guide roller 58 can be changed through the self-rotation of the fourth guide roller 58, so that the second annular release cloth 42 is separated from the profiled material 21, the second supporting roller 57 is arranged between the third guide roller 56 and the fourth guide roller 58, and is used for supporting the second annular release cloth 42, assisting the second annular release cloth 42 to smoothly reverse at the third guide roller 56 and the fourth guide roller 58, and lengthening the use length of the second annular release cloth 42, which is beneficial to the segmented work of the second annular release cloth 42 and improves the service life.

[0058] When the second annular release cloth 42 is sleeved on the second transmission group 55, a second circulation loop is formed, in the production process of the profiled material 21, the second annular release cloth 42 enters the heated forming mold 20 from the mold inlet along with the impregnated fiber, the glue solution impregnated on the fiber is cured and bonded with the fiber together in the mold due to heating, and the profiled material 21 in the form of a pultruded profile is output together with the second annular release cloth 42 at the mold outlet of the forming mold 20, after being output at the mold outlet, the second annular release cloth 42 is separated from the other side surface of the profiled material 21 through the transmission of the second transmission group 55, and the second annular release cloth 42 enters the next production cycle following the transmission of the second transmission group 55.

[0059] The two circulation loops are arranged in the application, so that the profiled material 21 completes the pressing process of two rough surfaces in the forming process, and the tearing-off process of the release cloth is automatically completed after the profiled material 21 leaves the mold, continuous production can be realized, the production efficiency is high, and the post-processing process of re-winding and tearing off the release cloth after the wound profiled material 21 reaches the blade factory is avoided.

[0060] Exemplarily, the first circulation loop rotates in the clockwise direction, and the second circulation loop rotates in the counterclockwise direction; or the first circulation loop rotates in the counterclockwise direction, and the second circulation loop rotates in the clockwise direction.

[0061] In some embodiments, the first guide roller 52 and the third guide roller 56 are symmetrically distributed along a straight line where the movement direction of the profiled material 21 is located; the second guide roller 54 and the fourth guide roller 58 are symmetrically distributed along a straight line where the movement direction of the profiled material 21 is located; and the first supporting roller 53 and the second supporting roller 57 are symmetrically distributed along a straight line where the movement direction of the profiled material 21 is located.

[0062] By making the first guide roller 52 and the third guide roller 56, the second guide roller 54 and the fourth guide roller 58, the first support roller 53 and the second support roller 57 respectively symmetrically distributed along the straight line where the profile 21 movement direction is located, the profile 21 can complete the stripping process of the release cloth synchronously after leaving the mold, realizing continuous production, and at the same time, the first annular release cloth 41 and the second annular release cloth 42 can be subjected to the same force in the respective circulation loops, which is beneficial to the linear movement of the profile 21.

[0063] In some embodiments, the width of the release cloth is 2-4mm smaller than the inner cross-sectional width of the forming mold 20, and the length is 3-5 times the length of the mold in the profile 21 movement direction.

[0064] In some embodiments, the first guide roller 52 and the first support roller 53 are located in the same plane in the direction perpendicular to the profile 21 movement direction, or the first guide roller 52 and the second guide roller 54 are located in the same plane in the direction perpendicular to the profile 21 movement direction.

[0065] The third guide roller 56 and the second support roller 57 are located in the same plane in the direction perpendicular to the profile 21 movement direction, or the third guide roller 56 and the fourth guide roller 58 are located in the same plane in the direction perpendicular to the profile 21 movement direction.

[0066] By making the first guide roller 52 and the first support roller 53 or the second guide roller 54 located in the same plane in the direction perpendicular to the profile 21 movement direction, and the third guide roller 56 and the second support roller 57 or the fourth guide roller 58 located in the same plane in the direction perpendicular to the profile 21 movement direction, it is beneficial to make the profile 21 move in the horizontal direction.

[0067] In some embodiments, please continue to refer to FIG. 1, it also includes a support frame 60 for supporting the release cloth transmission device 50. The support frame 60 is used to make the release cloth transmission device 50 at different heights to cooperate with different transmission groups to roughen the two side surfaces of the profile 21.

[0068] The implementation of the profile 21 production line in this application is as follows:

[0069] The release cloth is formed by fluororubber 23, with a thickness of 1mm, and the radial tensile strength of the release cloth is 1580N, and the weft tensile strength is 1250N. The release cloth is cut into two identical sections according to the following dimensions: the width of the release cloth is 2-4mm smaller than the inner cross-sectional width of the forming mold 20, and the length is 3-5 times the length of the forming mold 20 in the profile 21 movement direction. The two ends of the release cloth are effectively closed to form the first annular release cloth 41 and the second annular release cloth 42.

[0070] The first annular release cloth 41 is pulled into the forming die 20 along with the impregnated fiber at the upper surface of the mold entrance. The rough surface of the first annular release cloth 41 is tightly attached to the impregnated fiber and is centrally positioned. The first annular release cloth 41 moves synchronously with the impregnated fiber through the three-zone heated cavity of the forming die 20. After leaving the die through the mold exit, the first annular release cloth 41 is separated from the solidified profile 21 by the mechanical force of the first transmission group 51. The film material on the upper surface of the profile 21 moves to the space above the forming die 20, forming a first circulation loop.

[0071] The second annular release cloth 42 is pulled into the forming die 20 along with the impregnated fiber at the lower surface of the mold entrance. The rough surface of the second annular release cloth 42 is tightly attached to the impregnated fiber and is centrally positioned. The second annular release cloth 42 moves synchronously with the impregnated fiber through the three-zone heated cavity of the forming die 20. After leaving the die through the mold exit, the second annular release cloth 42 is separated from the solidified profile 21 by the mechanical force of the second transmission group 55. The film material on the lower surface of the profile 21 moves to the space below the forming die 20, forming a second circulation loop.

[0072] By controlling the cavity thickness of the forming die 20 and the film material thickness of the first annular release cloth 41 and the second annular release cloth 42, the rough surfaces of the first annular release cloth 41 and the second annular release cloth 42 are tightly attached to the impregnated fiber and the profile 21. During the solidification and forming of the profile 21, the pressing process on the surface of the profile 21 is completed, ensuring that the roughness Ra of the surface of the profile 21 is not less than 8um.

[0073] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A release cloth, wherein: The release cloth includes a fluorine-containing material layer, the raw material of the fluorine-containing material layer includes a fluorine-containing polymer film material, and at least one side surface of the fluorine-containing material layer has a preset surface roughness Ra.

2. The release cloth according to claim 1, wherein The radial tensile strength of the fluorine-containing material layer is ≥1500N, and the weft tensile strength of the fluorine-containing material layer is ≥1200N.

3. The release cloth according to claim 1, wherein: The release cloth further includes a substrate layer, which is located on one side of the fluorine-containing material layer. The side of the fluorine-containing material layer facing away from the substrate layer has a preset surface roughness Ra.

4. The release cloth according to any one of claims 3, wherein The raw material of the substrate layer includes at least one of polyamide and polyester fibers; and / or, The raw material of the fluorine-containing material layer includes at least one of fluororubber 23, fluororubber 26, fluororubber 246, perfluoroether rubber, polyvinylidene fluoride, polyperfluoroethylene propylene, and polychlorotrifluoroethylene.

5. The release cloth according to any one of claims 1 to 4, wherein: The preset surface roughness Ra has a value range of Ra≥8um.

6. A pultrusion device, wherein: The pultrusion equipment comprises: A feeding device for providing dipped fibers; A forming mold, used for solidifying the impregnated fiber into a profile; A traction system, used for pulling the profile to move; A stripping cloth and a stripping cloth transmission device, wherein the stripping cloth adopts the stripping cloth described in any one of claims 1 to 5 and has a closed ring structure, the stripping cloth is sleeved on the stripping cloth transmission device to form a circulating loop, and is used to move with the profile and form a preset surface roughness Ra on at least one side surface of the profile in a direction perpendicular to its own thickness, and the stripping cloth transmission device is used to drive the stripping cloth to rotate.

7. The pultrusion apparatus according to claim 6, wherein: The stripping cloth includes a first annular stripping cloth and a second annular stripping cloth, and the stripping cloth transmission device includes a first transmission group and a second transmission group; The first transmission group includes a first guide roller, a first support roller, and a second guide roller. The first guide roller is arranged at the inlet of the forming mold, the second guide roller is arranged at the outlet of the forming mold, the first support roller is arranged between the first guide roller and the second guide roller, and the first annular demoulding cloth is sleeved on the first transmission group to form a first circulation loop. The second transmission group includes a third guide roller, a second support roller and a fourth guide roller. The third guide roller is arranged at the inlet of the forming mold, the fourth guide roller is arranged at the outlet of the forming mold, and the second support roller is arranged between the third guide roller and the fourth guide roller. When the second annular demolding cloth is arranged on the second transmission group, a second circulation loop is formed. The circulation directions of the first circulation loop and the second circulation loop are opposite.

8. The pultrusion apparatus according to claim 7, wherein: The first guide roller and the third guide roller are symmetrically distributed along the straight line in the direction of movement of the profile; the second guide roller and the fourth guide roller are symmetrically distributed along the straight line in the direction of movement of the profile; the first support roller and the second support roller are symmetrically distributed along the straight line in the direction of movement of the profile.

9. The pultrusion apparatus according to claim 7, wherein: The first guide roller and the first support roller are located in the same plane in a direction perpendicular to the moving direction of the profile, or the first guide roller and the second guide roller are located in the same plane in a direction perpendicular to the moving direction of the profile; The third guide roller and the second support roller are located in the same plane in a direction perpendicular to the moving direction of the profile, or the third guide roller and the fourth guide roller are located in the same plane in a direction perpendicular to the moving direction of the profile.

10. The pultrusion apparatus according to claim 6, wherein: It also includes a support frame, which is used to support the stripping cloth transmission device.

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