CN116330705A - Continuous thermoplastic unidirectional multilayer composite sheet, production equipment and production process thereof - Google Patents
Continuous thermoplastic unidirectional multilayer composite sheet, production equipment and production process thereof Download PDFInfo
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- CN116330705A CN116330705A CN202310599469.0A CN202310599469A CN116330705A CN 116330705 A CN116330705 A CN 116330705A CN 202310599469 A CN202310599469 A CN 202310599469A CN 116330705 A CN116330705 A CN 116330705A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 41
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 23
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 23
- 239000010410 layer Substances 0.000 claims abstract description 114
- 239000002344 surface layer Substances 0.000 claims abstract description 64
- 238000007493 shaping process Methods 0.000 claims abstract description 33
- 238000001125 extrusion Methods 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims description 27
- 229920005989 resin Polymers 0.000 claims description 27
- 239000000835 fiber Substances 0.000 claims description 23
- 238000005470 impregnation Methods 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 23
- 238000005520 cutting process Methods 0.000 claims description 22
- 230000001360 synchronised effect Effects 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 10
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- 239000003365 glass fiber Substances 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
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- 235000014676 Phragmites communis Nutrition 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 229920002994 synthetic fiber Polymers 0.000 claims description 3
- 239000012209 synthetic fiber Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 6
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
Abstract
The invention relates to the technical field of sheet manufacture, in particular to a continuous thermoplastic unidirectional multilayer composite sheet, and production equipment and production process thereof, wherein the composite sheet comprises a surface layer, an intermediate layer and a base layer, the intermediate layer is paved between the base layer and the surface layer, the production equipment comprises a creel, a yarn traction device, a base layer extrusion device, a surface layer extrusion device, a filling and distributing device, a pressure composite group roller, a pressure shaping group roller and a shaping blanking unit.
Description
Technical Field
The invention relates to the technical field of composite sheet manufacturing, in particular to continuous thermoplastic unidirectional multilayer composite sheet production equipment and a production process.
Background
The continuous fiber reinforced thermoplastic composite prepreg tape has been greatly developed in recent years due to its excellent mechanical properties such as high tensile strength, flexural strength and modulus, excellent high and low temperature impact properties, low density and recyclability, and the like, and the corresponding manufacturing technology has also been greatly broken through,
the prior unidirectional multilayer composite sheet material adopts the technology of continuously reinforcing glass fiber or carbon fiber by using hot melt resin for a long time, and mainly adopts unidirectional composite equipment and technology. However, the unidirectional tape is characterized by a high tensile strength in the machine direction but extremely weak in the transverse direction. In order to overcome the weakness of the prior art, the technology adopted in the prior art is to firstly segment the unidirectional tape, stack a plurality of layers in the 90-degree direction with the original unidirectional tape, and then carry out secondary hot pressing to form a structure similar to a three-ply board so as to meet the tensile requirement of longitudinal and transverse directions, but the structure is very troublesome to process, has high processing cost and has low production efficiency.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a continuous thermoplastic unidirectional multilayer composite sheet production apparatus and production process that are high in production efficiency and low in cost.
In order to solve the technical problems, a first technical scheme adopted by the invention is as follows: a continuous thermoplastic unidirectional multilayer composite sheet production equipment is used for producing the composite sheet, and comprises a creel, a yarn traction device, a base layer extrusion device, a surface layer extrusion device, a filling and distributing device, a pressure composite set roller, a pressure shaping set roller and a shaping and blanking unit, wherein the base layer extrusion device comprises a base layer resin extruder and a base layer impregnation die, the surface layer extrusion device comprises a surface layer resin extruder and a surface layer impregnation die, the yarn traction device can traction yarns on the creel into the base layer impregnation die and the surface layer impregnation die, the filling and distributing device can lay an intermediate layer between the base layer and the surface layer, the pressure composite set roller is used for laminating the sheet,
the pressure shaping group roller is used for carrying out press shaping on the sheet, and the shaping blanking unit is used for blanking after cutting and shaping the sheet.
In the above technical scheme, plastic unloading unit includes leveling cooling group roller, rim charge cuts, flattens traction unit, rim charge rolling machine and material collecting device, and leveling cooling group roller is used for leveling and cooling the sheet, and the rim charge cuts and is used for tailorring the sheet to required shape, and rim charge rolling machine can pack up the rim charge that it was tailorred down, flattens traction unit and is used for flattening the sheet after cutting the rim charge, and material collecting device can pack up the finished product sheet.
In the above technical scheme, the receiving device includes synchronous cutting machine, synchronous traction mechanism and lift stack platform, and synchronous traction mechanism can remove the sheet that synchronous cutting machine cut to the lift stack platform.
In the above technical scheme, the material receiving device is a winding device.
In the above technical scheme, the front end of the base layer impregnation die is provided with an oven.
In the above technical scheme, a heating unit is arranged in the filling and distributing device.
In order to achieve the above object, a second technical solution of the present invention is: the production method for producing the continuous thermoplastic unidirectional multilayer composite sheet comprises the production equipment and comprises the following steps:
s1, a yarn traction device draws out a plurality of yarns from a creel;
s2, the yarns led out are divided into two strands by a yarn collecting reed at the front part of the yarn traction device, one strand is led to a surface layer dipping mold, and the other strand is led to a base layer dipping mold after being dried by an oven;
s3, extruding the raw materials of the base layer into a base layer impregnating mould by using a base layer resin extruder, mixing the raw materials with yarns to generate the base layer, extruding the raw materials of the surface layer into a surface layer impregnating mould by using a surface layer resin extruder, and mixing the raw materials with the yarns to generate the surface layer;
s4, converging the generated base layer and the surface layer at a filling and distributing device, arranging an intermediate layer between the base layer and the surface layer by the filling and distributing device, and arranging the intermediate layer in a random manner in the laying direction of the short fibers;
s5, pressing and forming the combined base layer, the surface layer and the middle layer in the S4 through a pressure composite set roller and a pressure shaping set roller;
s6, cutting the composite sheet formed in the step S5, and collecting and discharging.
In the technical scheme, the middle layer is formed by mixing and hot-melting resin liquid or powder with short fibers, and the laying direction of the short fibers is random.
In the above technical scheme, the short fibers of the middle layer are glass fibers, basalt fibers or other synthetic fibers.
In the above technical scheme, the base layer and the surface layer are both unidirectional tape sheets formed by hot melting of fibers and resin, the fibers of the base layer and the surface layer are one or more combinations of glass fibers, carbon fibers and basalt, and the resin of the base layer and the surface layer is one or more combinations of PP, PE, PC or PPs.
In summary, compared with the traditional technical means, the technical scheme provided by the invention has the following beneficial effects: the unidirectional tape of the invention utilizes the multidirectional stable characteristic of the short fiber to compound the unidirectional tape in one-step multilayer, the direction of the short fiber of the middle layer is random when the short fiber is laid, and the entanglement effect is added between the fibers of the unidirectional tape of the base layer and the surface layer, so that the problems of strong longitudinal tensile capacity of the unidirectional tape and easy cracking of the transverse surface are solved, and the production cost of the composite sheet is lower.
Meanwhile, the invention designs corresponding production equipment and production technology, the whole production technology is simpler and more convenient, the temperature control requirements among different materials in the produced composite sheet are good, the interlayer bonding effect is better, the integrity is better, the production efficiency is high, and the cost is lower.
Drawings
The foregoing and other objects, features, and advantages of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.
FIG. 1 is a schematic perspective view of a thermoplastic unidirectional multilayer composite sheet of the present invention;
FIG. 2 is a schematic view of a continuous thermoplastic unidirectional multilayer composite sheet production apparatus of the present invention;
FIG. 3 is an enlarged partial schematic view of the rear portion of FIG. 2;
FIG. 4 is an enlarged partial schematic view of the front portion of FIG. 2;
the labels are as follows: a creel 100; yarn traction device 200; a collector reed 210; a base layer extrusion device 300; a base layer resin extruder 310; a base layer impregnation die 320; a facing extrusion device 400; a face resin extruder 410; a face layer impregnation die 420; filling the cloth device 500; a pressure compound set roller 600; a pressure shaping set roller 700; a shaping blanking unit 800; leveling the cooling group roller 810; edge slitting 820; flattening and pulling assembly 830; a rim charge winder 840; a receiving device 850; a synchronous slitter 851; synchronous traction mechanism 852; lifting the stacking platform 853; a composite sheet 900; a facing 910; an intermediate layer 920; a base layer 930.
Detailed Description
The following preferred embodiments according to the present invention are intended to suggest that various changes and modifications may be made by the worker skilled in the art without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
The invention will be further described with reference to the following drawings:
in a first embodiment, as shown in fig. 2 to 4, a continuous thermoplastic unidirectional multilayer composite sheet production apparatus includes a creel 100, a yarn traction device 200, a base layer extrusion device 300, a surface layer extrusion device 400, a filling and distributing device 500, a press-compounding set roller 600, a press-shaping set roller 700, and a shaping and blanking unit 800, wherein the base layer extrusion device 300 includes a base layer resin extruder 310 and a base layer impregnation die 320, the surface layer extrusion device 400 includes a surface layer resin extruder 410 and a surface layer impregnation die 420, the yarn traction device 200 can draw yarns 110 on the creel 100 into the base layer impregnation die 320 and the surface layer impregnation die 420, the filling and distributing device 500 can lay an intermediate layer 920 between the base layer 930 and the surface layer 910, the press-compounding set roller 600 is used for laminating sheets,
the press-shaping set roller 700 is used for press-shaping the sheet, and the shaping blanking unit 800 is used for blanking after cutting and shaping the sheet.
The shaping blanking unit 800 comprises a leveling cooling set roller 810, a rim charge cutting 820, a flattening traction unit 830, a rim charge rolling machine 840 and a material receiving device 850, wherein the leveling cooling set roller 810 is used for leveling and cooling a sheet, the rim charge cutting 820 is used for cutting the sheet to a required shape, the rim charge rolling machine 840 can pack the rim charge cut by the rim charge rolling machine 840, the flattening traction unit 830 is used for flattening the sheet cut by the rim charge cutting 820, and the material receiving device 850 can pack the finished sheet.
The material receiving device 850 comprises a synchronous dividing and cutting machine 851, a synchronous traction mechanism 852 and a lifting and stacking platform 853, when the thickness of the sheet is large, the sheet is stacked in a cutting and stacking mode, the formed sheet is drawn by the synchronous traction mechanism 852 and moves to the material receiving device 850, the synchronous dividing and cutting machine 851 cuts the sheet into a proper length and then is drawn to the lifting and stacking platform 853 by the synchronous traction mechanism 852, the lifting and stacking platform 853 automatically lifts according to the thickness of the sheet, and thus the platform height of the lifting and stacking platform 853 can adapt to the position of the synchronous traction mechanism 852.
In a second embodiment, as shown in fig. 2, a continuous thermoplastic unidirectional multilayer composite sheet production apparatus includes a creel 100, a yarn traction device 200, a base layer extrusion device 300, a surface layer extrusion device 400, a filling and distributing device 500, a pressure composite set roller 600, a pressure shaping set roller 700 and a shaping and blanking unit 800, wherein the base layer extrusion device 300 includes a base layer resin extruder 310 and a base layer impregnation die 320, the surface layer extrusion device 400 includes a surface layer resin extruder 410 and a surface layer impregnation die 420, the yarn traction device 200 can draw yarns 110 on the creel 100 into the base layer impregnation die 320 and the surface layer impregnation die 420, the filling and distributing device 500 can lay an intermediate layer 920 between the base layer 930 and the surface layer 910, the pressure composite set roller 600 is used for pressing the sheet 900,
the press-shaping set roller 700 is used for press-shaping the sheet, and the shaping blanking unit 800 is used for blanking after cutting and shaping the sheet.
The material collecting device 850 is a winding device, and when the produced sheet is thinner, the winding device is generally used to directly wind up the sheet in a roll shape.
The front end of the base layer impregnation die 320 is provided with the oven 330, so that the base layer 930 needs to be ensured to have a larger thickness, and the base layer 930 needs to be heated by the oven, so that the base layer 930 is easier to spread, and the dispersion of fibers in the base layer 930 is facilitated.
The filling and distributing device 500 is provided with a heating unit, and the raw material of the intermediate layer 920 contains resin, so that the intermediate layer 920 needs to be melted at a certain temperature to ensure the fluidity, so that the intermediate layer 920 can be uniformly laid on the base layer 930.
In a third embodiment, a method for producing a continuous thermoplastic unidirectional multilayer composite sheet includes the production apparatus described above, and includes the following steps:
s1, a yarn traction device 200 draws out a plurality of yarns from a creel 100;
s2, the yarns 110 led out are divided into two strands by the yarn collecting reed 210 at the front part of the yarn traction device 200, one strand is led to the surface layer dipping mold 420, and the other strand is led to the base layer dipping mold 320 after being dried by the oven 330;
s3, extruding the raw materials of the base layer 930 into a base layer impregnating mould 320 by the base layer resin extruder 310, mixing the raw materials with the yarns 110 to generate the base layer 930, extruding the raw materials of the surface layer 910 into a surface layer impregnating mould 420 by the surface layer resin extruder 410, and mixing the raw materials with the yarns 110 to generate the surface layer 910;
the base layer 930 and the surface layer 910 generated in S4 are joined at the filling and distributing device 500, the filling and distributing device 500 arranges the intermediate layer 920 between the base layer 930 and the surface layer 910, and the laying direction of the short fibers is random when arranging;
s5, pressing and forming the combined base layer 930, the surface layer 910 and the intermediate layer 920 in the S4 through the pressure composite set roller 600 and the pressure shaping set roller 700;
s6, cutting the composite sheet formed in the step S5, and collecting and discharging.
As shown in fig. 1, the continuous thermoplastic unidirectional multilayer composite sheet comprises a surface layer 910, an intermediate layer 920 and a base layer 930, wherein the intermediate layer 920 is paved between the base layer 930 and the surface layer 910, the intermediate layer 920 is formed by mixing and hot-melting resin liquid or powder with short fibers, and the paving direction of the short fibers is random.
The base layer 930 and the surface layer 910 are both unidirectional tape sheets formed by hot melting fibers and resin, the fibers of the base layer 930 and the surface layer 910 are one or more of glass fibers, carbon fibers and basalt, and the resin of the base layer 930 and the surface layer 910 is one or more of PP, PE, PC or PPs.
The short fibers of the middle layer 920 are glass fibers, basalt fibers or other synthetic fibers.
The materials used for facing layer 920 and base layer 930 are not the same in actual processing, but facing layer 910 only needs to consider the aesthetic appearance of the sheet, but the focus of the base layer 930 is the tensile strength of the material.
The intermediate layer 920 may be added with a raw material such as flame retardant to meet the requirements of new material application under special working conditions.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A continuous thermoplastic unidirectional multilayer composite sheet production apparatus, characterized in that: comprises a creel (100), a yarn traction device (200), a base layer extrusion device (300), a surface layer extrusion device (400), a filling and distributing device (500), a pressure compound set roller (600), a pressure shaping set roller (700) and a shaping blanking unit (800), wherein the base layer extrusion device (300) comprises a base layer resin extruder (310) and a base layer impregnation die (320), the surface layer extrusion device (400) comprises a surface layer resin extruder (410) and a surface layer impregnation die (420), the yarn traction device (200) can traction yarns (110) on the creel (100) into the base layer impregnation die (320) and the surface layer impregnation die (420), the filling and distributing device (500) can lay an intermediate layer (920) between the base layer (930) and the surface layer (910), the pressure compound set roller (600) is used for laminating sheets (900),
the press shaping group roller (700) is used for pressing and shaping the sheet, and the shaping blanking unit (800) is used for blanking after cutting and shaping the sheet.
2. The continuous thermoplastic unidirectional multi-layer composite sheet production apparatus of claim 1, wherein: the shaping and blanking unit (800) comprises a leveling and cooling group roller (810), a rim charge cutting (820), a leveling traction unit (830), a rim charge winding machine (840) and a material receiving device (850),
leveling cooling group rollers (810) for leveling and cooling the sheet,
the edge material slitting (820) is used for cutting the sheet material to a required shape, the edge material winding machine (840) can collect the edge material cut by the edge material winding machine,
the flattening traction unit (830) is used for flattening the sheet material after cutting (820) the edge material,
the receiving device (850) is capable of receiving the finished sheet (900).
3. The continuous thermoplastic unidirectional multi-layer composite sheet production apparatus of claim 2, wherein: the material receiving device (850) comprises a synchronous dividing and cutting machine (851), a synchronous traction mechanism (852) and a lifting stacking platform (853), wherein the synchronous traction mechanism (852) can move a sheet cut by the synchronous dividing and cutting machine (851) onto the lifting stacking platform (853).
4. The continuous thermoplastic unidirectional multi-layer composite sheet production apparatus of claim 2, wherein: the material receiving device (850) is a winding device.
5. The continuous thermoplastic unidirectional multi-layer composite sheet production apparatus of claim 1, wherein: an oven (330) is arranged at the front end of the base layer impregnation die (320).
6. The continuous thermoplastic unidirectional multi-layer composite sheet production apparatus of claim 1, wherein: the filling and distributing device (500) is provided with a heating unit.
7. A production method for producing a continuous thermoplastic unidirectional multilayer composite sheet is characterized by comprising the following steps: production plant comprising any one of claims 1 to 6, comprising the steps of:
s1, a yarn traction device (200) draws out a plurality of yarns (110) from a creel (100);
the yarn (110) led out by the S2 is divided into two strands by a yarn collecting reed (210) at the front part of the yarn traction device (200), one strand is led to a surface layer impregnation die (420), and the other strand is led to a base layer impregnation die (320) after being dried by a baking oven (330);
s3, extruding the raw material of the base layer (930) into a base layer impregnating mould (320) by the base layer resin extruder (310), mixing with the yarns (110) to generate the base layer (930), extruding the raw material of the surface layer (910) into a surface layer impregnating mould (420) by the surface layer resin extruder (410), and mixing with the yarns (110) to generate the surface layer (910);
s4, converging the base layer (930) and the surface layer (910) generated by the step S4 at a filling and distributing device (500), arranging an intermediate layer (920) between the base layer (930) and the surface layer (910) by the filling and distributing device (500), and arranging the intermediate layer and the surface layer, wherein the laying direction of the short fibers is random;
s5, pressing and forming the combined base layer (930), the surface layer (920) and the intermediate layer (910) in the S4 through a pressure composite set roller (600) and a pressure shaping set roller (700);
s6, cutting the composite sheet formed in the step S5, and collecting and discharging.
8. The production method of the continuous thermoplastic unidirectional multilayer composite sheet of claim 7, wherein: the middle layer (920) is formed by mixing and hot-melting resin liquid or powder with short fibers, and the laying direction of the short fibers is random.
9. The production method of continuous thermoplastic unidirectional multilayer composite sheet production of claim 8, wherein: the short fibers of the middle layer (920) are glass fibers, basalt fibers or other synthetic fibers.
10. The production method of the continuous thermoplastic unidirectional multilayer composite sheet of claim 7, wherein: the base layer (930) and the surface layer (910) are unidirectional tape sheets formed by hot melting of fibers and resin, the fibers of the base layer (930) and the surface layer (910) are one or more of glass fibers, carbon fibers and basalt, and the resin of the base layer (930) and the surface layer (910) is one or more of PP, PE, PC or PPs.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310599469.0A CN116330705A (en) | 2023-05-25 | 2023-05-25 | Continuous thermoplastic unidirectional multilayer composite sheet, production equipment and production process thereof |
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| CN202310599469.0A CN116330705A (en) | 2023-05-25 | 2023-05-25 | Continuous thermoplastic unidirectional multilayer composite sheet, production equipment and production process thereof |
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