CN111745857A - Preparation method and equipment of unidirectional fiber reinforced resin body with regular cross section - Google Patents
Preparation method and equipment of unidirectional fiber reinforced resin body with regular cross section Download PDFInfo
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- CN111745857A CN111745857A CN202010661573.4A CN202010661573A CN111745857A CN 111745857 A CN111745857 A CN 111745857A CN 202010661573 A CN202010661573 A CN 202010661573A CN 111745857 A CN111745857 A CN 111745857A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
- B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
- B29B15/10—Coating or impregnating independently of the moulding or shaping step
- B29B15/12—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length
- B29B15/14—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length of filaments or wires
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Abstract
A preparation method and equipment of unidirectional fiber reinforced resin body with regular section, a group of extrusion equipment die heads coat hot melt resin on the roller surface of a hot melt resin smearing guide roller in an extrusion mode to form a layer of hot melt resin film with uniform thickness; the continuous fiber and hot melt resin fusion impregnation unit is made into at least one group of unidirectional fiber reinforced resin body subunits with regular sections through beam splitting, integration and cooling shaping devices along the width direction of the unit; or at least one group of die cavity unit devices which are integrated with separation, cooling and shaping are adopted to fuse and impregnate the continuous fibers and the hot melt resin, and at least one continuous slice type unidirectional fiber reinforced resin body subunit is separated along the width direction of the unit; and cutting the unidirectional fiber reinforced resin body subunits with regular sections or the sheet type unidirectional fiber reinforced resin body subunits into unidirectional fiber reinforced resin bodies with regular sections or sheet types with certain lengths by a transverse cutting device.
Description
Technical Field
The invention belongs to the technical field of long fiber reinforced thermoplastic composite materials, and particularly relates to a preparation method and equipment of a unidirectional fiber reinforced resin body with a regular cross section and a fixed length.
Background
Various fiber-reinforced resin composite materials are gradually replacing traditional metal materials, and are widely applied to various fields requiring light weight, including various vehicles such as airplanes and automobiles.
With the application development of fiber reinforced thermoplastic composite materials, long glass fiber reinforced polypropylene (LFT) materials are gradually popularized due to excellent physical properties of the LFT materials. The method is widely applied to a plurality of fields such as transportation, civil and military aviation, petrochemical industry, sports equipment, building materials and the like. The purposes of light product weight, high strength, corrosion resistance, recyclability and convenient processing and forming are achieved, and due to the excellent comprehensive performance, the industry is developed vigorously.
At present, according to the LFT technology on the market, the problems of broken glass fibers, hairiness and the like are easily caused by the infiltration of the die head, meanwhile, the content of the glass fibers exceeding 60 percent is difficult to achieve due to the fact that the glass fibers need to pass through an infiltration groove due to the forming mechanism of the die head infiltration, meanwhile, flame retardants on the market such as polyphosphate and the like are poor in temperature resistance, the infiltration of the die head needs to be carried out at high temperature, the flame retardants are easily decomposed in the infiltration die head, and the flame retardant performance of the LFT long glass fiber reinforcement cannot be achieved.
According to the preparation process and the preparation equipment of the unidirectional fiber reinforced resin body with the regular cross section and the fixed length, unidirectional continuous fibers do not need to pass through an extruder, the condition of fiber damage is avoided, the content is not limited and controlled by the extruder, a very large adjustable space is provided, the high-temperature requirements of a flame retardant can be met by the processing temperature, the material residence time and the like, 30-85% of LFT products can be prepared, and meanwhile, the flame-retardant reinforced LFT material can be prepared.
Disclosure of Invention
In order to realize the purpose, the invention provides a preparation method and equipment of a unidirectional fiber reinforced resin body with a regular cross section, which adopts an open continuous fiber and hot melt resin rolling impregnation device consisting of a hot melt resin smearing guide roller and a plurality of grades of parallel and alternately arranged triangular structure impregnation unit modules in a serial form; the group of extrusion equipment die heads coat hot-melt resin on the roller surface of the hot-melt resin smearing guide roller in an extrusion mode to form a layer of hot-melt resin film with uniform thickness; the hot melt resin smearing guide rollers are driven independently, the rotating speed of the hot melt resin smearing guide rollers can be set independently, and a layer of hot melt resin film layer with uniform thickness coated on the roller surface of a group of hot melt resin smearing guide rollers is synchronously smeared on a row of unidirectional continuous uniformly flattened fiber bodies through the rotating motion of the hot melt resin smearing guide rollers;
then, a row of unidirectional continuous uniformly flattened fiber bodies preliminarily fused by hot melt resin enter an open continuous fiber and hot melt resin rolling, dipping and smearing device consisting of a delta-shaped structure dipping and smearing unit modules which are arranged in series in a multistage parallel interaction manner; the full and effective fusion of the hot-melt resin and the fiber is realized;
then, the continuous fiber and hot melt resin fusion impregnation unit is made into at least one group of unidirectional fiber reinforced resin body subunits with regular sections through beam splitting, integration and cooling shaping die cavity devices along the width direction of the unit;
and finally, cutting the unidirectional fiber reinforced resin body subunits with the regular cross sections into unidirectional fiber reinforced resin bodies with the regular cross sections and a certain length by a transverse cutting device.
Furthermore, a group of hot melt resin smearing guide rollers and a group of extrusion equipment die head devices are respectively arranged on the upper side and the lower side of the row of unidirectional, continuous and uniform flattened fiber bodies; continuously coating the hot-melt resin provided by a corresponding group of die heads of the extrusion equipment on the roller surface of the hot-melt resin coating guide roller through an upper hot-melt resin coating guide roller and a lower hot-melt resin coating guide roller respectively to form a layer of hot-melt resin film with uniform thickness; respectively coating a layer of hot-melt resin film with uniform thickness coated on the roller surfaces of the upper hot-melt resin coating guide roller and the lower hot-melt resin coating guide roller on the upper side and the lower side of a row of unidirectional continuous uniformly-flattened fibrous bodies through the rotating motion of the upper hot-melt resin coating guide roller and the lower hot-melt resin coating guide roller; a row of unidirectional continuous evenly-flattened fibrous bodies preliminarily fused with hot-melt resin enter an open continuous fiber and hot-melt resin rolling impregnation device consisting of a triangular structure impregnation unit module which is in multi-stage parallel interaction and arranged in series, so that the hot-melt resin and the fibrous bodies are fully and effectively fused;
further, a group of hot melt resin smearing guide rollers and a group of die head devices of extrusion equipment are arranged at the upper part of the row of unidirectional continuous uniform fiber spreading bodies; meanwhile, only one group of die head devices of hot melt resin extrusion equipment is arranged at the lower part of a row of unidirectional, continuous and uniform flattened fiber bodies; coating a layer of hot melt resin film with uniform thickness on the surface of the hot melt resin coating guide roller on one side of the upper part of a row of unidirectional continuous uniformly flattened fibers by the rotary motion of the upper hot melt resin coating guide roller; meanwhile, uniformly extruding and coating hot melt resin on one side of the lower part of the row of unidirectional continuous uniformly-flattened fibers by a group of extrusion equipment die heads arranged on the lower part of the row of unidirectional continuous uniformly-flattened fibers;
further, the reference surface of the outlet lip of the die head of the extrusion equipment is parallel to the axis of the hot melt resin coating guide roller, and the position of the hot melt resin film extrusion die head of the extrusion equipment is set according to the set angle and the set gap by taking the roller surface of the hot melt resin coating guide roller as the reference; the setting range of the gap between the outlet lip of the hot-melt resin film extrusion die head of the extrusion equipment and the roller surface of the hot-melt resin smearing guide roller is 0.1-10 mm; the included angle between the hot-melt resin film extrusion die head of the extrusion equipment and the horizontal plane is set within the range of 10-150 degrees;
furthermore, the open continuous fiber and hot melt resin rolling impregnation device is composed of a plurality of impregnation unit modules with a delta-shaped structure which are arranged in parallel in a serial connection mode in a staggered mode; each dipping unit module is arranged in a delta-shaped structure by three groups of dipping smearing rollers; the dipping unit module of a Chinese character 'pin' structure consisting of three groups of coating rollers is respectively in two arrangement forms of a genuine Chinese character 'pin' structure and an inverted Chinese character 'pin' structure; the impregnation unit modules are arranged in series in an interval, parallel and staggered mode according to the genuine character structure and the inverted character structure;
furthermore, the center distance between the three groups of dipping and smearing rollers of each dipping and smearing unit module is adjusted by adjusting the positions of the top smearing roller of the right delta-shaped dipping and smearing unit module and the position of the dipping and smearing roller at the bottom of the reverse delta-shaped dipping and smearing unit module; setting wrap angles of a row of unidirectional continuous uniformly flattened fibers and the coating roller by adjusting the center distance of the coating roller of the dipping unit module; the wrap angle of the one-row unidirectional continuous uniformly flattened fibers and a coating roller at the top of the prime character structure dipping unit module or the wrap angle of the one-row unidirectional continuous uniformly flattened fibers and a coating roller at the bottom of the reverse character structure dipping unit module is set within a range of 15-180 degrees;
furthermore, the adjustment of the gaps among the roll surfaces of the three groups of smearing rollers of each dipping unit module is realized by adjusting the center distance of the smearing rollers of the unit modules; the setting range of the gap between the top smearing roller of the same regular-product-shaped structural impregnation unit module and the roller surfaces of the two adjacent groups of impregnation smearing rollers or the gap between the bottom smearing roller of the same reverse-product-shaped structural impregnation unit module and the roller surfaces of the two adjacent groups of smearing rollers is 0.1-15 mm; by adjusting the center distance of the coating rollers of the unit modules and setting the gap between the impregnating and coating rollers of the unit modules, the proper fiber tension required by effective fusion of a row of unidirectional, continuous and uniform flattened fibers and hot-melt resin and the pressure for fusion of the hot-melt resin into a bundle of closely arranged fibers are obtained;
furthermore, the hot-melt resin coating guide roller and each group of rollers forming each stage of impregnation unit module are provided with built-in heating structures; the built-in heating can be a tubular electric heating element inserted into the inner cavity of the roller; or a liquid heating medium passing through a roller built-in channel; if hot oil is used as a heating medium, the end part of the shaft head at the transmission side of the hot oil is connected with an external heat supply source through a rotary joint device;
furthermore, shaft head rotating support pairs at two ends of the coating roller at the top of the genuine character or the bottom of the inverted character of each dipping and coating unit module are respectively connected with a linearly movable transmission pair device, so that the independent adjustment of the center distance of the three dipping and coating rollers of each unit module group is realized; further, each group of dipping and smearing rollers adopts a chain wheel or a gear to transmit rotary motion at a shaft head on the transmission side of the dipping and smearing rollers;
furthermore, a plurality of groups of radiation type heating devices can be respectively arranged at the upper part and the lower part of an open continuous fiber and hot melt resin rolling impregnation device consisting of the multistage parallel interaction, series-connected triangular structure impregnation coating unit modules, so as to provide hot melt resin and a row of unidirectional continuous uniformly-flattened fiber bodies, and the heat required by the effective fusion of the hot melt resin coating and the row of flattened fibers in the multistage, interactive parallel and series-connected impregnation coating unit module process is provided;
furthermore, the beam splitting, integrating and cooling shaping die cavity device adopts at least one group of die cavity units integrating beam splitting, integrating and cooling shaping into a whole, and each group of separated cooling shaping die cavity units are arranged in a staggered manner in the height direction, so that the separated adjacent sheet type unidirectional fiber reinforced resin body subunits are also arranged in a corresponding staggered manner in the height direction;
further, at least one group of longitudinal separation and shaping cooling die cavity units are adopted to uniformly separate a row of continuous fibers and hot melt resin fusion unit bodies along the width direction of the unit bodies, and at least one slice-type unidirectional fiber reinforced resin body subunit is separated;
furthermore, a group of longitudinal separating and shaping cooling die cavity units consists of a pair of rollers with concave and convex surfaces coupled; wherein, a flow passage of cooling water is arranged in the roller; and is connected with a cold water system with adjustable temperature;
further, the beam splitting die cavity uniformly divides the continuous fiber units fused with the hot melt resin into at least one group of unit beams of which the continuous fibers are effectively fused with the hot melt resin along the width direction of the continuous fiber units; wherein, the size of the cross section of the beam splitting die cavity along the length direction is continuously reduced;
further, the beam splitting die cavity is open;
further, at least one group of unit bundles formed by fusing continuous fibers and hot-melt resin respectively pass through the integrated die cavities at corresponding positions to carry out pressing and shaping on the regular sections of the unidirectional fiber reinforced resin body; the integrated die cavity is a geometric cylinder with the cross section size along the length direction of the integrated die cavity continuously decreasing; the integrated die cavity is at least provided with a group of raised steps along the length direction of the integrated die cavity, and the hot pressing of the unit bundle formed by fusing the continuous fibers and the hot-melt resin is enhanced; the cooling shaping die cavity is used for enabling at least one group of integrated continuous fibers and hot-melt resin fused unit bodies to pass through the cooling shaping die cavity with a built-in cooling water channel respectively, and further pressing, cooling and shaping are carried out on the unidirectional fiber reinforced resin unit bundles;
furthermore, the beam splitting and integrating die cavity device is respectively provided with a heat source device with adjustable temperature; wherein, the heat source of the heat source device comprises an electric heating pipe or a liquid heat transfer medium; the cooling shaping die cavity is internally provided with a cooling water runner and is connected with a water cooler with adjustable temperature.
The device further comprises a flattening device, wherein a row of continuous fiber bodies formed by a plurality of bundles of fibers are tensioned to the bundles of fibers by a set wrap angle, and the continuous fiber bodies are regularly and uniformly flattened along the width direction of the continuous fiber bodies by contacting with a geometric curved surface of a yarn passing member; wherein, the back of the yarn passing component is provided with a reinforced structural part; the arching degree of the yarn passing component along the vertical direction of the geometric generatrix thereof is adjusted through a jacking component arranged in the back reinforcing structural component, and the yarn passing component is fixed; the camber or the depth of the yarn passing component in the vertical direction of the geometric generatrix of the yarn passing component is within a set value range of 0.05-5.0 mm by taking the process center line of production line preparation equipment as a reference; the back structure reinforcing part is provided with at least two groups of jacking mechanisms; the jacking mechanism takes the reinforcing component as a support and adjusts the arching degree of the geometric curved surface of the yarn passing component; meanwhile, the yarn passing component is connected and fixed with the reinforcing component; suitable cross-sectional geometrical curves of a contact area of the yarn passing member and a row of continuous fibers consisting of a plurality of bundles of fibers in a wrap angle mode comprise semicircular, partial arc, full circle or SIGN curves; the yarn passing component is provided with a built-in heating element; the built-in heating element can be a tubular electric heating element inserted into the inner cavity of the yarn passing member; or heating by adopting a liquid heating medium through a channel arranged on the yarn passing component;
furthermore, the flattening device consists of three groups of components; wherein, two groups are fixed yarn passing components, and one group is adjustable yarn passing components and is arranged according to a V-shaped structure; the position of the yarn passing and flattening component at the bottom of the V-shaped structure is adjusted, the center distance among the three groups of components is changed, and the wrap angle between the fiber body and the working unit component and the tension of the fiber body are changed;
further, the device also comprises a friction member made of a material different from the fiber body, and an electrification device for generating the same charge to the friction of the fiber body; wherein the friction member material comprises a metal material of copper, steel or aluminum alloy, or a non-metal material of ceramic, nylon or hard rubber;
further, the friction member performs repeated contact type friction motion on the surfaces of a row of unidirectional and continuous flattened fiber yarns through an actuator; repulsive force among the same charges is generated among all the fiber yarns of the unidirectional continuous flattening fiber body in the row through friction motion, and the unidirectional continuous fiber yarns in the row are further flattened uniformly;
furthermore, the geometric structure of the head part of the friction member, which is contacted with the surface of the row of unidirectional continuous flattened fiber yarns, comprises a spherical body, a semi-spherical body, a spherical segment body, a cylinder, a semi-cylinder, a small semi-cylinder, or a continuous three-dimensional geometric curved surface, or a continuous two-dimensional geometric curved surface;
further, the actuator that drives the friction member unit includes a driving element powered by electricity, air, or hydraulic pressure.
The invention also provides a preparation method of the unidirectional fiber reinforced resin body with the regular cross section, which comprises the following steps:
s1: a plurality of bundles of fibers are synchronously sent into a unidirectional continuous fiber primary carding device through a yarn placing rotating shaft which is arranged on a creel and can be respectively arranged by the tension of each bundle of fibers, and then the fiber bundles are fluffed through an oven;
s2, uniformly spreading the continuous fiber tows arranged in a plurality of bundles along the surface of the convex geometric body of the tension roller under the tension action of the fiber ordered tension flattening device; meanwhile, the repulsion force between the same charges generated among the fiber yarns by the mechanical yarn scraping electrostatic generating device further uniformly flattens the continuous fiber tows arranged in a plurality of bundles;
s3, coating the extruded hot melt resin on the roller surface of a hot melt resin coating guide roller by a group of extrusion equipment die heads in a coating mode to form a layer of hot melt resin film with uniform thickness;
s4, synchronously coating a layer of hot melt resin film with uniform thickness on the roller surface of a group of hot melt resin coating guide rollers on a row of unidirectional continuous uniformly flattened fibers through the rotation motion of the hot melt resin coating guide rollers;
s5, enabling a row of unidirectional continuous evenly-flattened fibers primarily fused with hot-melt resin to enter a multi-stage tandem, parallel interactive and open type continuous fiber and hot-melt resin rolling impregnation device to realize effective fusion of the hot-melt resin and the fibers;
s6: a row of unidirectional continuous evenly-flattened fiber bodies, in which the continuous fibers and the hot-melt resin are effectively fused, are evenly divided into at least one bundle of continuous fiber and hot-melt resin fused subunits through a beam splitting die cavity along the width direction of the fiber bodies under the driving action of main traction; then at least one bundle of continuous fibers and hot melt resin fusion subunit is manufactured through an integration and cooling shaping die cavity unit device; then, the resin is cut into pieces of a predetermined length by a crosscutting device to obtain a unidirectional fiber-reinforced resin body having a predetermined length and a high fiber content and a regular cross section.
The invention also provides a preparation method of the fixed-length flake-type high-fiber-content unidirectional fiber reinforced resin body, which comprises the following steps of:
s1: a plurality of bundles of fibers are synchronously sent into a unidirectional continuous fiber primary carding device through a yarn placing rotating shaft which is arranged on a creel and can be respectively arranged by the tension of each bundle of fibers, and then the fiber bundles are fluffed through an oven;
s2, uniformly spreading the continuous fiber tows arranged in a plurality of bundles along the surface of the convex geometric body of the tension roller under the tension action of the fiber ordered tension flattening device; meanwhile, the repulsion force between the same charges generated among the fiber yarns by the mechanical yarn scraping electrostatic generating device further uniformly flattens the continuous fiber tows arranged in a plurality of bundles;
s3, coating the extruded hot melt resin on the roller surface of a hot melt resin coating guide roller by a group of extrusion equipment die heads in a coating mode to form a layer of hot melt resin film with uniform thickness;
s4, synchronously coating a layer of hot melt resin film with uniform thickness on the roller surface of a group of hot melt resin coating guide rollers on a row of unidirectional continuous uniformly flattened fibers through the rotation motion of the hot melt resin coating guide rollers;
s5, enabling a row of unidirectional continuous evenly-flattened fibers primarily fused with hot-melt resin to enter a multi-stage tandem, parallel interactive and open type continuous fiber and hot-melt resin rolling impregnation device to realize effective fusion of the hot-melt resin and the fibers;
s6: under the driving action of main traction, a row of unidirectional continuous uniformly flattened fiber bodies formed by effectively fusing continuous fibers and hot melt resin continuously pass through at least one group of longitudinal separation, shaping and cooling devices, and a row of continuous fibers and hot melt resin fusion units are uniformly separated along the width direction of the fusion units; thereafter, the resin sheet is cut into pieces of a predetermined length by a cross cutting device, thereby obtaining a sheet-like unidirectional fiber-reinforced resin body of a predetermined length.
By adopting the technical scheme, the invention achieves the following effects: the unidirectional fiber reinforced resin body with regular section and fixed length and high fiber content is prepared.
Drawings
FIG. 1 is a schematic structural diagram of a hot melt resin extrusion die and a hot melt resin application guide roller arranged on two sides in combination with a multi-stage tandem, parallel interactive, open continuous fiber and hot melt resin rolling impregnation application device according to an embodiment of the present invention;
FIG. 1a is a schematic view of a configuration of an embodiment of the present invention in which a set of a hot-melt resin extrusion die and a hot-melt resin application guide roller are arranged on one side;
FIG. 1b is a schematic structural view of an embodiment of the present invention, in which a hot-melt resin extrusion die head is arranged up and down, and a hot-melt resin application guide roller is arranged at the lower part of the hot-melt resin extrusion die head;
FIG. 1c is a schematic structural view of an embodiment of the present invention, in which a hot-melt resin extrusion die head is arranged up and down, and a hot-melt resin application guide roller is provided at the upper part;
FIG. 2 is a schematic diagram of a structural view of a genuine character structural impregnation unit module roll according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a reverse delta-shaped structural impregnation unit module roller according to an embodiment of the invention;
FIG. 4 is a schematic view of an apparatus for manufacturing a unidirectional continuous fiber reinforced resin composite according to an embodiment of the present invention;
FIG. 5 is a sectional view of a split, integrated, cooling and setting apparatus for forming a thin sheet type fiber reinforced resin body according to an embodiment of the present invention;
FIG. 6 is a schematic view of a splitting, integrating and cooling-sizing apparatus for forming a fiber reinforced resin body of regular cross-section according to an embodiment of the present invention;
FIG. 7 is a front view of a set of flattened unit modules of an embodiment of the present invention;
FIG. 8 is a side view of a set of flattened unit modules of an embodiment of the present invention;
FIG. 9 is a front view of a friction fiber charging apparatus according to an embodiment of the present invention;
FIG. 10 is a top view of a friction fiber charging apparatus according to an embodiment of the present invention;
FIG. 11 is a force analysis graph of the change in tension before and after the fiber passes through the nip roll according to an embodiment of the present invention
The device comprises a continuous fiber row consisting of a plurality of fiber bundles, a fiber flattening unit module 21, a first fiber flattening unit module, a fiber flattening unit module 22, a second fiber flattening unit module 23, a third fiber flattening unit module 24, a yarn passing component 25, a back structure reinforcing component 26, a jacking mechanism 3, a die head for extruding molten resin, a die head 31 for extruding molten resin, a die head for extruding molten resin arranged at the lower part of the continuous fiber, a hot melt resin coating guide roller 4, a hot melt resin coating guide roller 41, a hot melt resin coating guide roller arranged at the lower part of the continuous fiber, a genuine product character structure impregnation unit module 5, a genuine product character structure impregnation unit module 6, a reverse character structure impregnation unit module 7, a cooling device 80, a yarn unwinding rack 81, a carding rack 82, an oven 83, a friction fiber electrification device 83-1, a friction component 83-2, a reciprocating motion mechanism 84, a beam splitting die cavity, The device comprises a heating channel of a beam splitting die cavity, 85, a heat insulation structure body, 86, an integrated die cavity, 86-1, a heating channel of the integrated die cavity, 87, a cooling and shaping die cavity, 87-1, a cooling channel of the cooling and shaping die cavity, 88, a crawler-type traction mechanism, 88-1, a compression roller type traction mechanism, 89, a transverse cutting mechanism, 90, a longitudinal separation and shaping cooling device and 90-1 rollers with concave and convex surfaces coupled.
Detailed Description
The present invention is further illustrated by the following specific examples, which are, however, not intended to limit the scope of the invention.
Example 1
As shown in fig. 4, a plurality of rolls of continuous fibers are loaded on a creel 80, each fiber is pulled to a carding frame 81 to form a row of continuous fibers 1 composed of a plurality of bundles, then the continuous fibers pass through a first set of flattening unit modules 21, the fibers are initially unfolded, the horizontal height of each yarn is limited on the same horizontal plane, then the row of continuous fibers 1 composed of the plurality of bundles passes through an oven 82, part of impregnating agent used for adhering the bundles on the fiber surface is baked, and further yarn unfolding is facilitated, the continuous fibers 1 enter a second set of flattening unit modules 22 again after coming out of the oven 82, then enter a friction fiber electrification device 83, and then enter a third set of flattening unit modules 23, at the moment, the continuous fibers 1 are unfolded to a perfect state without visible gaps, and a next step of impregnating with resin is prepared;
after thermoplastic resin is heated by an extruder and extruded by a die head 3 for extruding molten resin, a layer of film which is in a waterfall shape is sprayed on a hot melt resin coating guide roller 4, continuous fibers 1 pass through the guide roller 4, contact with the continuous fibers and have a certain wrap angle, are combined with uniform resin on the coating guide roller, then pass through a multistage parallel interaction consisting of a genuine character structure impregnation unit module 5 and a reverse character structure impregnation unit module 6, are serially arranged in an open continuous fiber and hot melt resin rolling impregnation device to obtain a molten product with fully fused fibers and resin, and then pass through a beam splitting die cavity 84 to be uniformly divided into at least one beam of subunit with fused continuous fibers and hot melt resin; then at least one bundle of continuous fiber and hot melt resin fusion subunit is manufactured through an integrated 86 and cooling shaping 87 module unit device; then, the resin is cut into pieces of a predetermined length by a crosscutting device 89 after passing through a drawing device 88, thereby producing the unidirectional fiber-reinforced resin body having a regular cross section and a predetermined length and a high fiber content.
In this embodiment, the continuous fiber is a twistless continuous fiber of 2400TEX with 362CYF by boulder group, the main material of the resin is polypropylene material (PP), the melt index is 50-110 g/10min, and a compatibilizer with an amount of 10% of the main material polypropylene is added, which has the function of increasing the bonding strength of the polypropylene (PP) and the glass fiber, and the main component of the compatibilizer is grafted maleic anhydride, and 0.3% of antioxidant is added, although it should be understood by those skilled in the art that the continuous fiber material described herein includes, but is not limited to, the materials set forth herein, such as glass fiber, carbon fiber, aramid fiber, etc.; the fiber reinforced thermoplastic resin suitable for the fiber reinforced thermoplastic resin includes, but is not limited to, those mentioned herein, such as polypropylene resin PP, polyethylene resin PE, polyester resin PET, nylon resin PA6 or PA66, PC resin, PEEK resin, PPS resin, etc., and the related auxiliary agents corresponding thereto include, but are not limited to, other antioxidants, ultraviolet absorbers, light stabilizers, lubricating auxiliaries, etc.
In this embodiment, each roll of fiber on the yarn releasing frame 80 is equipped with a tension control device, which can adjust the tension of a single roll of fiber independently, and can also realize the adjustment of the overall tension, and the front and back height of the yarn releasing frame 80 along the length direction of the preparation equipment can be adjusted;
in this embodiment, the carding frame 81 is a device similar to a comb, each fiber passes through a slit, and the position of each fiber in the width direction is fixed after the fiber drawn from the yarn releasing frame passes through the carding frame 81, so that a plurality of bundles of fibers form a row of uniform and ordered continuous fibers 1;
as shown in fig. 4, 7 and 8, in the present embodiment, there are three sets of flattening unit modules 21, 22 and 23, each module is composed of three sets of yarn passing members 24 which contact with continuous fibers and generate a certain wrap angle and corresponding back reinforcing structural members 25, wherein each yarn passing member is provided with a built-in heating structure, the heating structure adopts electric heating as a heating element, and the set temperature is 80-110 ℃; the back structural reinforcement member 25 is provided with a plurality of group jack-up mechanisms 26; the jacking mechanisms 26 can realize the function of adjusting the arching degree of the yarn passing member 24 by taking the reinforcing member 25 as a support, and simultaneously play a role of connecting and fixing the yarn passing member 24 and the reinforcing member 25, wherein the arching degree in the embodiment is that the distance between the roller surface at the middle position after the yarn passing member is arched and the reinforcing structural member is adjusted to be 1 mm; in addition, two groups of left and right of the three groups of units are position fixing yarn passing components 24, one group of yarn passing components 24 capable of moving up and down are arranged according to a V-shaped structure, the adjustment of the center distance among the three groups of components can be realized through the movement of the movable yarn passing components 24, so that the wrap angle of the fiber and the working unit components is changed, the tension of the fiber is adjusted, and the principle of the tension adjustment and the adjustment are calculated as follows:
FIG. 11 is a graph showing the force analysis of the change in tension before and after the fiber passes through the nip roll
The mechanical properties were analyzed by considering the contact portion of the fiber with the roller as a point (e.g., the intersection of the X-axis and the Y-axis in the figure): tension F in the direction of the fibre feed into the roll1Tension F after roll discharge2The supporting force F of the roller to the fiberNAnd the friction force F of the roller against the fiberfThe direction of which is as shown in the above figure, defining half the wrap angle of the fibre on the roll as theta, the angle shown by the 30 deg. angle in the figure.
Wherein the friction force Ff＝μFNMu is a friction coefficient ① formula
For each force projection onto the X-axis, there are: f2cosθ＝F1cosθ+F f② formula
For each force projection onto the Y-axis, there are: f2sinθ+F1sinθ＝F N③ formula
Defining the tension of the fibre after passing over the roll to be k times that before passing over the roll, i.e. F2＝kF 1④ formula
From ① to ④:
since a set of V rolls has 3 rolls, the tension increase k after passing a set of rolls3And (4) doubling. Taking theta as 30 degrees, namely wrap angle as 60 degrees, finding according to the data that the friction coefficient of the glass fiber and the steel is about 0.2, wherein the value is 0.2, k is 1.26,k3the tension of the fiber is increased by about two times after the fiber passes through a set of V-shaped tension rolls each having a wrap angle of 60 ° on each roll.
Through the calculation, the tension of the fiber can be increased by about two times every time the fiber passes through one group of flattening unit modules, after the fiber passes through 3 groups, the tension reaches nearly 8 times before the fiber passes through the flattening unit modules, the principle of gradual unfolding is met, the fiber and resin coating process is also suitable for a subsequent coating process consisting of a plurality of groups of triangular structure impregnation unit modules, and the wettability of the fiber and the resin is gradually improved along with the gradual increase of the tension.
In the present embodiment, the oven 82 is an infrared heating method, and is composed of a plurality of sets of ceramic infrared heaters, wherein the length of the heaters is about 1m, the width of the heaters is greater than the total width of the fibers after the fibers are unfolded, the heaters are 1-10 cm away from the surfaces of the fibers, and the set temperature is 490 ℃ at most.
In the embodiment, a friction fiber electrification device 83 is arranged between the second set of flattening unit modules 22 and the third set of flattening unit modules 23, and consists of a friction member 88 and a reciprocating mechanism 89; the friction member material adopts a copper block in the example, and the copper block performs reciprocating friction motion on the surfaces of a row of unidirectional and continuous flattened fiber yarns; the design principle is that a row of unidirectional continuous flattened fiber yarns 1 are charged with the same kind of charges through friction, repulsive force between the charges generated between adjacent fiber yarns is obtained, and the uniform arrangement degree of the flattened fiber yarns is improved; the head geometry of the copper block in contact with the flattened filament surface was chosen to resemble the 1/4 spherical shape of a fingertip. In addition, the reciprocating mechanism is driven by a motor.
As shown in fig. 4, in this embodiment, the setting temperature of the extruder from the screw portion to the melt pump to the connection area portion connected to the die head and finally to the extrusion die head 3 is 190 ℃ to 270 ℃, the melt flow rate of the resin increases with the increase of the temperature, the increase of the melt flow rate is favorable for the infiltration degree of the fiber and the resin, but an excessively high temperature causes the phenomena of yellowing, decomposition and aging of the resin, so a proper temperature selection range needs to be found, of course, different choices of materials and the temperature setting range need to be changed, for example, PA or PC material with a higher melting point cannot be set to a temperature as low as 190 ℃, and the die head of the extrusion device coats the extruded hot melt resin on the roller surface of the hot melt resin coating guide roller 4 in a coating manner to form a hot melt resin film layer with a uniform thickness; then the hot melt resin smearing guide roller 4 synchronously coats a uniform resin film layer on a row of unidirectional continuous uniformly flattened fibers 1 through the rotation motion of the hot melt resin smearing guide roller 4, wherein the rotation motion of the hot melt resin smearing guide roller 4 is controlled by a single motor, the rotation speed of the hot melt resin smearing guide roller is set to be lower than the running speed of the fibers, the linear speed of the roller surface of the hot melt resin smearing guide roller 4 is set to be 6-10 m/min, the running speed of the fibers, namely the traction speed, is set to be 15-25 m/min, in addition, the hot melt resin smearing guide roller 4 is connected with a heating device, the hot melt resin smearing guide roller is heated by a heat conduction oil mode in the example, the heat conduction oil is controlled by an oil temperature set to be 200-250 ℃, and the temperature application range is different when different resin materials are selected, and the set temperature needs.
In the embodiment, a row of unidirectional continuous uniformly flattened fibers preliminarily fused with hot melt resin after passing through a hot melt resin smearing guide roller 4 enter a multistage parallel interaction consisting of a genuine product character structure impregnation unit module 5 and an inverted product character structure impregnation unit module 6, and an open type continuous fiber and hot melt resin rolling impregnation device is arranged in series to complete effective fusion of the hot melt resin and the fibers, wherein each product character structure impregnation unit module has a motor control rotating speed as same as that of the hot melt resin smearing guide roller, the roller surface linear speed is set to be 10-15 m/min in the example, and a heating mode is provided, a mode of conducting heat oil is selected for heating in the example, the conducting heat oil is controlled by an oil temperature controller, the temperature is set to be 200-250 ℃, and the temperature application range is different when different resin materials are selected, and the set temperature needs to be adjusted according to the materials, by reference to the calculation of the tension of the fibres in the modules of the unwinding units of the fibres before and after passing through the rollers with a certain wrap angle to the fibres, it can be concluded that: the tension of the continuous fiber 1 is gradually increased and the wettability is gradually improved when the continuous fiber and the hot melt resin roll impregnation device are arranged in series through the multistage parallel interaction.
Referring to fig. 4 and 5, in this embodiment, a row of unidirectional continuous uniformly flattened fibers 1 passes through a longitudinal separation and shaping cooling device 90 under the driving force of a main traction device 88-1, and is separated into a plurality of continuous fiber reinforced resin bodies in the form of thin sheets, and then passes through the traction device 88-1 and a transverse cutting device 89 after traction to form a final product: a sheet-like, fixed-length, unidirectional fiber-reinforced resin body having a high fiber content.
Example 2
The multi-roll continuous fiber loaded on the yarn releasing frame 80 passes through a row of continuous fibers 1 formed by a carding frame 81, passes through three groups of flattening unit modules 21, 22 and 23, an oven 82 and a friction fiber electrification device 83, forms a row of continuous fibers 1 with good spreading performance and uniformity, is coated with a hot melt resin by a guide roller 4 and is in multi-stage parallel interaction with a thermoplastic molten resin extruded by an extruder, is fully soaked after being rolled and impregnated by an open continuous fiber and a hot melt resin roll impregnation device which are arranged in series, and is finally separated, cooled and shaped into an integral mold cavity unit device: the longitudinal separating, shaping and cooling device 90 is formed by combining a plurality of groups of rollers 90-1 with concave and convex surfaces coupled with each other, and uniformly separates the row of continuous fibers from the hot melt resin fusion unit body along the width direction of the unit body; separating at least one sheet of said unidirectional fiber-reinforced resin body subunits, and finally obtaining the final product by means of a double-roller type traction device 88-1 and a transverse cutting device 89: one piece of the sheet-type unidirectional fiber-reinforced resin body
In this example, the continuous fiber is carbon fiber, the resin is PA66, the temperature of the extruder from the screw to the extrusion die is set to 240-310 ℃, the hot melt resin coating guide roller 4 is in parallel interaction with the plurality of stages, the temperature of the open continuous fiber and the hot melt resin rolling impregnation device arranged in series is set to 260-300 ℃, the drawing speed is set to 10-15 m/min, the roller surface linear speed of the hot melt resin coating guide roller 4 is set to 5-7 m/min, the plurality of stages are in parallel interaction, the roller surface linear speed of the open continuous fiber and the hot melt resin rolling impregnation device arranged in series is set to 7-10 m/min, the roller surface speed of the non-drawing roller contacted with the continuous fiber before cooling is set to be slower than the drawing speed, i.e. the running speed of the fiber, because if set to be the same as or even faster than the drawing speed, the broken fine hairiness on the fiber is wound on the roller surface, the more the fine hairiness is accumulated, the production is influenced, and when the speed is lower than the traction speed, because the speed of the continuous fiber is higher than the speed of the roller surface of the hot roller contacted with the continuous fiber, the roller surface and the fiber move relatively, even if the hairiness is wound on the roller surface instantly, the hairiness can be taken away by the continuous fiber, and the more the hairiness is wound, so that the production is not influenced.
As shown in fig. 1a, unlike example 1, a hot-melt resin extrusion die 3 and a hot-melt resin application guide roller 4 were provided only above a row of unidirectional continuous uniformly flattened fibers 1, and the hot-melt resin was applied to the continuous fibers 1 by the rotational movement of the hot-melt resin application guide roller 4.
In another embodiment of this example, as shown in fig. 1b, a second hot-melt resin extrusion die 31 is provided below a row of unidirectional continuous uniformly flattened fibers 1, the upper hot-melt resin extrusion die 3 uniformly applies hot-melt resin to the continuous fibers, the lower hot-melt resin extrusion die 31 uniformly applies hot-melt resin to the hot-melt resin application guide roller 4, and the hot-melt resin is applied to the continuous fibers by the rotational movement of the hot-melt resin application guide roller 4.
Referring to fig. 1c, in another embodiment of the present example, a second hot-melt resin extrusion die 31 is disposed below a row of unidirectional continuous uniformly flattened fibers 1, the upper hot-melt resin extrusion die 3 uniformly applies hot-melt resin to a hot-melt resin application guide roller 4 and applies hot-melt resin to the continuous fibers by the rotational motion of the hot-melt resin application guide roller 4, and the lower hot-melt resin extrusion die 31 uniformly applies hot-melt resin to the continuous fibers 1.
Referring to fig. 4 and 6, in this embodiment, a row of unidirectional continuous uniformly flattened fibers 1 fully fused with hot melt resin passes through a splitting, integrating and cooling and shaping device in sequence under the driving force of a main tractor 88, wherein the cross section dimension of the die cavity of the splitting device 84 along the length direction thereof is continuously reduced and is open, a heat source device 84-1 is arranged in the device, the cross section dimension of the integrating die cavity along the length direction thereof is also continuously reduced and is closed, at least one set of protruding steps is arranged in the integrating die cavity along the length direction thereof, so as to enhance the hot pressing of the unit bundle fused with the hot melt resin by the continuous fibers, a heat source device 86-1 is arranged in the integrating die cavity, and a cooling water channel 87-1 is arranged in the cooling and shaping die cavity.
After passing through the cooling and shaping device 87, the produced unidirectional fiber reinforced resin body with regular cross section and high fiber content is made into a final product after passing through a traction device 88 and a transverse cutting device 89: a regular-section, fixed-length unidirectional fiber-reinforced resin body with high fiber content.
While specific embodiments of the present invention have been described in detail above, it will be appreciated that those skilled in the art, upon attaining an understanding of the foregoing may readily produce alterations to, variations of, and equivalents to these embodiments. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (18)
1. The equipment for preparing the unidirectional fiber reinforced resin body with the regular cross section is characterized in that an open continuous fiber and hot melt resin rolling and impregnating device consisting of a hot melt resin smearing guide roller and a plurality of grades of impregnating unit modules which are alternately arranged in parallel in a series manner and have a delta-shaped structure is adopted;
the group of extrusion equipment die heads coat hot-melt resin on the roller surface of the hot-melt resin smearing guide roller in an extrusion mode to form a layer of hot-melt resin film with uniform thickness;
the hot melt resin smearing guide rollers are driven independently, the rotating speed of the hot melt resin smearing guide rollers can be set independently, and a layer of hot melt resin film layer with uniform thickness coated on the roller surface of a group of hot melt resin smearing guide rollers is synchronously smeared on a row of unidirectional continuous uniformly flattened fiber bodies through the rotating motion of the hot melt resin smearing guide rollers;
a row of unidirectional continuous uniformly-flattened fibrous bodies preliminarily fused with hot melt resin enter an open continuous fiber and hot melt resin rolling, impregnating and coating device consisting of a plurality of stages of serially-connected parallel and alternately-arranged triangular structure impregnating and coating unit modules, so that the hot melt resin and the fibers are fully and effectively fused.
At least one group of beam splitting, integrating and cooling molding die cavity unit devices are adopted to fuse and impregnate the continuous fibers and the hot melt resin, and at least one group of continuous unidirectional fiber reinforced resin body sheets are separated along the width direction of the continuous fiber and hot melt resin fusion and impregnation unit.
2. The apparatus for producing a unidirectional fiber-reinforced resin body with a regular cross section according to claim 1, wherein a group of hot melt resin application guide rollers and a group of die head devices of an extrusion apparatus are respectively provided on the upper and lower sides of a row of unidirectional continuous uniformly flattened fiber bodies;
continuously coating the hot-melt resin provided by a corresponding group of die heads of the extrusion equipment on the roller surface of the hot-melt resin coating guide roller through an upper hot-melt resin coating guide roller and a lower hot-melt resin coating guide roller respectively to form a layer of hot-melt resin film with uniform thickness;
respectively coating a layer of hot-melt resin film with uniform thickness coated on the roller surfaces of the upper hot-melt resin coating guide roller and the lower hot-melt resin coating guide roller on the upper side and the lower side of a row of unidirectional continuous uniformly-flattened fibrous bodies through the rotating motion of the upper hot-melt resin coating guide roller and the lower hot-melt resin coating guide roller;
a row of unidirectional continuous evenly-flattened fibrous bodies coated with hot-melt resin on the upper side and the lower side respectively enter an open continuous fiber and hot-melt resin rolling impregnation device consisting of a plurality of stages of serially-connected parallel and alternately-arranged triangular structure impregnation unit modules, so that the hot-melt resin and the fibrous bodies are fully and effectively fused.
3. The apparatus for preparing an unidirectional fiber reinforced resin body with a regular cross section according to claim 1, wherein a group of hot melt resin coating guide rollers and a group of extrusion device die head devices are arranged on the upper portion of a row of unidirectional continuous uniform spreading fiber bodies, and simultaneously, a group of hot melt resin extrusion device die head devices are arranged only on the lower portion of a row of unidirectional continuous uniform spreading fiber bodies.
4. The apparatus for producing a unidirectional fiber reinforced resin body with a regular cross section according to claim 1, wherein a reference surface of an outlet lip of a die head of the extrusion apparatus is parallel to an axis of the hot melt resin application guide roller, and a position of the hot melt resin film extrusion die head of the extrusion apparatus is set in such a manner that a clearance between the outlet lip of the die head of the extrusion apparatus and the roller surface of the hot melt resin application guide roller is set within a range of 0.1 to 10mm and an angle between the die head of the extrusion apparatus and a horizontal plane is set within a range of 10 to 150 degrees, based on the roller surface of the hot melt resin application guide roller.
5. The apparatus for preparing a regular cross-section unidirectional fiber reinforced resin body according to claim 1, wherein the open continuous fiber and hot melt resin roll impregnation device is composed of a plurality of impregnation unit modules in a delta structure, which are arranged in parallel in a staggered manner in series, each impregnation unit module is composed of three groups of impregnation applicator rollers in a delta structure;
the dipping unit modules of the triangle structure formed by the three groups of smearing rollers are respectively in two arrangement forms of a genuine triangle structure and an inverted triangle structure, and are arranged in series according to the genuine triangle structure and the inverted triangle structure in an interval, parallel and staggered manner;
the position of the top smearing roller of the right triangular dipping unit module and the position of the dipping smearing roller at the bottom of the inverted triangular dipping unit module are adjusted, so that the adjustment of the center distance between the three groups of dipping smearing rollers of each dipping smearing unit module is realized.
6. The apparatus for producing a unidirectional fiber reinforced resin body of regular cross section according to claim 5, wherein a wrap angle of a row of unidirectional continuous uniformly flattened fibers and the application roller is set by adjusting the center distance of the impregnation application roller of the impregnation unit module; the wrap angle of the one-row unidirectional continuous uniformly flattened fibers and a coating roller at the top of the prime character structure dipping unit module or the wrap angle of the one-row unidirectional continuous uniformly flattened fibers and a coating roller at the bottom of the reverse character structure dipping unit module is set within a range of 15-180 degrees;
the adjustment of the gaps among the roll surfaces of the three groups of smearing rollers of each dipping unit module is realized by adjusting the center distance of the smearing rollers of the unit modules; the setting range of the gap between the top smearing roller of the same regular-product-shaped structural impregnation unit module and the roller surfaces of the two adjacent groups of impregnation smearing rollers or the gap between the bottom smearing roller of the same reverse-product-shaped structural impregnation unit module and the roller surfaces of the two adjacent groups of smearing rollers is 0.1-15 mm;
by adjusting the center distance of the soaking and coating rollers of the unit modules and setting the gap between the soaking and coating rollers of the unit modules, the proper fiber tension required by effective fusion of a row of unidirectional, continuous and uniform flattened fibers and hot-melt resin and the pressure for fusion of the hot-melt resin into a bundle of fibers which are arranged closely are obtained.
7. The apparatus for producing a regular-section unidirectional fiber reinforced resin body according to claim 1, wherein the hot-melt resin application guide roller and each set of rollers constituting each stage of the impregnation unit modules are provided with a built-in heating structure; the built-in heating can be a tubular electric heating element inserted into the inner cavity of the roller; or a liquid heating medium passing through built-in passages of the rollers.
8. The apparatus for preparing unidirectional fiber reinforced resin with regular cross section according to claim 1, wherein the spindle nose rotation support pairs at both ends of the coating roller at the top of the genuine product or the bottom of the inverted product of each dip coating unit module are respectively connected with a linearly movable transmission pair device, so as to realize the independent adjustment of the center distance of the three dip coating rollers of each product unit module, and each dip coating roller group adopts a chain wheel or a gear to transmit the rotation motion at the spindle nose at the transmission side.
9. The apparatus for preparing unidirectional fiber reinforced resin body with regular cross section according to claim 7, wherein a plurality of groups of radiant heating devices are respectively arranged on the upper and lower parts of the open continuous fiber and hot melt resin rolling impregnation device composed of the multi-stage serial, parallel and alternate arranged delta-shaped structural impregnation and coating unit modules to provide hot melt resin and a row of unidirectional continuous and uniform flattened fiber bodies, and the heat required by the effective fusion of the hot melt resin coating and the row of flattened fiber bodies in the process of the multi-stage serial, alternate and parallel arranged impregnation and coating unit modules is provided.
10. The apparatus for producing a unidirectional fiber-reinforced resin body having a regular cross section according to claim 1, further comprising a flattening device for flattening the bundle of continuous fibers in a regular and uniform manner in the width direction of the passing member by bringing the bundle of continuous fibers in a row of bundles of fibers into contact with the geometrically curved surface of the passing member under a tension applied to the bundle of fibers at a predetermined wrap angle;
the back of the yarn passing component is provided with a reinforcing structural part, and the arching degree of the yarn passing component along the vertical direction of a geometric generatrix of the yarn passing component is adjusted through a jacking component arranged in the back reinforcing structural part and is fixed; the camber or the depth of the yarn passing component in the vertical direction of the geometric generatrix of the yarn passing component is within a set value range of 0.05-5.0 mm by taking the process center line of production line preparation equipment as a reference;
11. the apparatus for producing a unidirectional fiber reinforced resin body having a regular cross section according to claim 10, wherein the back structure-reinforcing member is provided with at least two sets of jack-up mechanisms, the jack-up mechanisms are supported by the reinforcing member, and adjust the degree of arching of the geometric curved surface of the over-yarn member, and at the same time, connect and fix the over-yarn member and the reinforcing member;
suitable cross-sectional geometrical curves of a contact area of the yarn passing member and a row of continuous fibers consisting of a plurality of bundles of fibers in a wrap angle mode comprise semicircular, partial arc, full circle or SIGN curves;
the yarn passing component is provided with a built-in heating element, and the built-in heating element can be a tubular electric heating element inserted into the inner cavity of the yarn passing component or a liquid heating medium is adopted to heat through a channel arranged on the yarn passing component.
12. The apparatus for producing a unidirectional fiber reinforced resin body having a regular cross section as claimed in claim 11, wherein the flattening means is composed of three sets of members, two of which are fixed position yarn passing members and one of which is adjustable position yarn passing members, and are arranged in a V-shaped configuration; the center distance among the three groups of components is changed by adjusting the position of the over-yarn flattening component at the bottom of the V-shaped structure, and the wrap angle between the fiber body and the working unit component and the tension of the fiber body are changed.
13. The apparatus for producing a unidirectional fiber-reinforced resin body having a regular cross section according to claim 11, further comprising an electrifying means for generating an electric charge of the same kind by friction with the fiber body using a friction member made of a material different from that of said fiber body; the friction member material comprises a metal material of copper, steel and aluminum alloy, or a non-metal material of ceramic, nylon and hard rubber;
the friction member performs repeated contact type friction motion on the surfaces of the unidirectional continuous flattening fibers in a row through the actuator, and further performs uniform flattening on the unidirectional continuous fibers in the row through repulsive force between charges of the same type generated between adjacent fibers in the unidirectional continuous flattening fiber body in the row through the friction motion
The head geometric configuration of the friction member in contact with the surface of a row of unidirectional continuously flattened filaments comprises: a spherical body, a semi-spherical body, a spherical segment body, a cylinder, a semi-cylinder, a small semi-cylinder, or a continuous three-dimensional geometric curved surface, or a continuous two-dimensional geometric curved surface;
the actuator driving the friction member unit includes a driving element powered by electricity, air or hydraulic pressure.
14. The apparatus for producing a unidirectional fiber reinforced resin body with a regular cross section according to claim 1, wherein at least one set of cavity units is adopted, which is integrated with splitting, integrating, cooling and shaping; wherein, each group of separated cooling and shaping die cavity units are arranged in a staggered manner in the height direction, so that the separated adjacent sheet type unidirectional fiber reinforced resin body subunits are correspondingly arranged in a staggered manner in the height direction.
15. The apparatus for producing a unidirectional fiber-reinforced resin body with a regular cross-section according to claim 1, wherein at least one set of longitudinal separating and shaping cooling cavity units is used to uniformly separate a row of continuous fibers and a hot-melt resin fused unit body into at least one sheet-like unidirectional fiber-reinforced resin body subunit in the width direction thereof;
a group of longitudinal separating and shaping cooling die cavity units, which consists of a pair of rollers with concave and convex surfaces coupled; wherein, the roller is internally provided with a cooling water channel and is connected with a temperature adjustable cold water system.
16. The apparatus for producing a regular-section unidirectional fiber-reinforced resin body as claimed in claim 1, wherein the split cavity is formed by dividing the continuous fiber unit, which is to be fused with the hot-melt resin, into the split cavity in the width direction thereof, the cross-sectional dimension of the split cavity in the length direction thereof being continuously decreased;
the beam splitting die cavity is open, the integrated die cavity enables at least one group of unit beams formed by fusing continuous fibers and hot-melt resin to pass through the integrated die cavities at corresponding positions respectively, and the unidirectional fiber reinforced resin body is subjected to regular cross section press-fitting and shaping; wherein, the cross section of the integrated die cavity along the length direction is a geometric cylinder with continuously decreasing size;
the integrated die cavity is at least provided with a group of raised steps along the length direction of the integrated die cavity, and the hot pressing of the unit bundle formed by fusing the continuous fibers and the hot-melt resin is enhanced;
and (3) a cooling and shaping die cavity, namely passing at least one group of integrated continuous fiber and hot melt resin fused unit bodies through the cooling and shaping die cavity with a built-in cooling water channel respectively to further press and cool and shape the unidirectional fiber reinforced resin unit bundle.
17. The apparatus for producing a regular cross-section unidirectional fiber reinforced resin body as claimed in claim 1, wherein the split cavity and the integrated cavity are respectively provided with temperature-adjustable heat source means; the heat source of the heat source device comprises an electric heating pipe, or a liquid heat transfer medium and the like; the cooling shaping die cavity is internally provided with a cooling water runner and is connected with a water cooler with adjustable temperature.
18. The method for preparing the regular-section unidirectional fiber reinforced resin body according to any one of claims 1 to 17, comprising the steps of:
s1: a plurality of bundles of fibers are synchronously sent into a unidirectional continuous fiber primary carding device through a yarn placing rotating shaft which is arranged on a creel and can be respectively arranged by the tension of each bundle of fibers, and then the fiber bundles are fluffed through an oven;
s2, uniformly spreading the continuous fiber tows arranged in a plurality of bundles along the surface of the convex geometric body of the tension roller under the tension action of the fiber ordered tension flattening device; meanwhile, the repulsion force between the same charges generated among the fiber yarns by the mechanical yarn scraping electrostatic generating device further uniformly flattens the continuous fiber tows arranged in a plurality of bundles;
s3, coating the extruded hot melt resin on the roller surface of a hot melt resin coating guide roller by a group of extrusion equipment die heads in a coating mode to form a layer of hot melt resin film with uniform thickness;
s4, synchronously coating a layer of hot melt resin film with uniform thickness on the roller surface of a group of hot melt resin coating guide rollers on a row of unidirectional continuous uniformly flattened fibers through the rotation motion of the hot melt resin coating guide rollers;
s5, enabling a row of unidirectional continuous evenly-flattened fibers primarily fused with hot-melt resin to enter a multi-stage tandem, parallel interactive and open type continuous fiber and hot-melt resin rolling impregnation device to realize effective fusion of the hot-melt resin and the fibers;
s6: a row of unidirectional continuous evenly-flattened fiber bodies formed by effectively fusing continuous fibers and hot-melt resin continuously pass through at least one group of longitudinal separation and shaping cooling devices under the driving action of main traction, so that a row of continuous fibers and hot-melt resin fusion units are evenly separated along the width direction of the continuous fibers and the hot-melt resin fusion units, and are cut off according to the set length through a transverse cutting device, and the fiber reinforced resin body with the regular cross section is obtained.
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| JP2022536468A (en) * | 2020-07-10 | 2022-08-17 | 江蘇奇一科技有限公司 | Manufacturing method and equipment for unidirectional continuous fiber reinforced thermoplastic composite |
| CN115871187A (en) * | 2023-02-23 | 2023-03-31 | 山东中水管道工程有限公司 | Production line for circumferentially coating composite pipe with fibers and plastics |
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| JP2022536468A (en) * | 2020-07-10 | 2022-08-17 | 江蘇奇一科技有限公司 | Manufacturing method and equipment for unidirectional continuous fiber reinforced thermoplastic composite |
| JP7145348B2 (en) | 2020-07-10 | 2022-09-30 | 江蘇奇一科技有限公司 | Manufacturing method and equipment for unidirectional continuous fiber reinforced thermoplastic composite |
| CN115871187A (en) * | 2023-02-23 | 2023-03-31 | 山东中水管道工程有限公司 | Production line for circumferentially coating composite pipe with fibers and plastics |
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| WO2022007038A1 (en) | 2022-01-13 |
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