阅读说明：本技术 连续纤维增强热塑性树脂复合材料及其制造方法 (Continuous fiber reinforced thermoplastic resin composite material and method for producing same ) 是由 金源硕 李宗昱 李有贞 于 2018-11-29 设计创作，主要内容包括：本发明公开能够用简单的方法将连续纤维增强热塑性树脂复合材料制造成具有优异的力学性能的方案,该方案能够应用到各种热塑性注塑产品的增强材生产及利用3D打印机的纤维增强热塑性塑料部件制作中。本发明提供连续纤维增强热塑性复合材料及其制造方法,该连续纤维增强热塑性复合材料通过合股多个纱线(yarn)或多个带(tape)的中间材而形成为棒形态。(The present invention discloses a scheme capable of manufacturing a continuous fiber reinforced thermoplastic resin composite material with excellent mechanical properties in a simple method, which can be applied to the production of reinforcements for various thermoplastic injection-molded products and the fabrication of fiber reinforced thermoplastic parts using a 3D printer. The invention provides a continuous fiber reinforced thermoplastic composite material formed in a rod shape by plying a plurality of yarns (yarn) or a plurality of intermediate materials of tape (tape), and a method for manufacturing the same.)

1. A continuous fiber reinforced thermoplastic composite material is formed in a rod shape by plying a plurality of yarns (yarn) or intermediate materials of a tape (tape).

2. The continuous fiber-reinforced thermoplastic resin composite material according to claim 1,

the porosity of the composite material is 1 to 10 vol%.

3. The continuous fiber-reinforced thermoplastic resin composite material according to claim 1,

the composite material satisfies the following formula 1 with reference to the cross section of the composite material,

[ mathematical formula 1]

0.2mm^-1≤P/A≤5mm^-1

In mathematical formula 1, P and a are the cross-sectional perimeter and the cross-sectional area of the composite material, respectively.

4. The continuous fiber-reinforced thermoplastic resin composite material according to claim 1,

the belt has a thickness of 0.1 to 1.0mm and a width of 3 to 30 mm.

5. The continuous fiber-reinforced thermoplastic resin composite material according to claim 1,

the plying is done by putting 2-10 of the yarns or 2-10 of the tapes.

6. The continuous fiber-reinforced thermoplastic resin composite material according to claim 1,

the continuous fiber is glass fiber or carbon fiber.

7. A method of manufacturing a continuous fiber reinforced thermoplastic resin composite, comprising:

step a: continuously feeding a plurality of intermediate materials in the form of yarns (yarn) or tapes (tape) to a heating section;

step b: melting at least a part of a thermoplastic resin of a surface of the intermediate material by heating the intermediate material to a temperature of a melting point or higher of the thermoplastic resin contained in the intermediate material; and

step c: the rod shape is formed by passing two or more molten intermediate materials through a nozzle and stranding the intermediate materials.

8. The method of manufacturing a continuous fiber-reinforced thermoplastic resin composite material according to claim 7,

in the intermediate material, the content of the continuous fibers is 30-60 wt%, and the content of the thermoplastic resin is 40-70 wt%.

9. The method of manufacturing a continuous fiber-reinforced thermoplastic resin composite material according to claim 7,

the heating in the step b is performed at a temperature 20 to 40 ℃ higher than the melting point of the thermoplastic resin.

10. The method of manufacturing a continuous fiber-reinforced thermoplastic resin composite material according to claim 7,

the nozzle has a cross-sectional shape free from bending or formed with one or more projections and depressions.

11. The method of manufacturing a continuous fiber-reinforced thermoplastic resin composite material according to claim 4,

the rod discharged through the nozzle is rotated to form a spiral shape.

12. The method of manufacturing a continuous fiber-reinforced thermoplastic resin composite material according to claim 4,

the ratio of the diameter of the inlet end part and the diameter of the outlet end part of the nozzle is 1.5-5, and the ratio of the length of the nozzle to the diameter of the outlet end part is 2-10.

13. The method of manufacturing a continuous fiber-reinforced thermoplastic resin composite material according to claim 4,

the nozzle is formed in a multi-stage structure and the diameter thereof is reduced toward the outlet side.

Technical Field

The present invention relates to a continuous fiber-reinforced thermoplastic resin composite material and a method for producing the same, and more particularly, to a continuous fiber-reinforced thermoplastic resin composite material that can be used as a reinforcing material for a thermoplastic resin injection-molded product and a method for producing the same.

Background

Continuous fiber reinforced polymer rods have been used in a variety of applications as structural reinforcements. Typically, the polymer rod is used as a reinforcing bar inserted into concrete instead of a reinforcing bar, and in recent years, the polymer rod is introduced into an insert injection molding process and used as a reinforcing insert inserted into an injection molded part, and is used for improving mechanical properties of various injection molded parts and achieving weight reduction. In addition, the polymer rod is also introduced into a 3D printing apparatus, and in a conventional method of manufacturing a laminated structure using only a thermoplastic resin, an attempt is made to manufacture a structure by adding continuous fibers to the inside of the resin and laminating a composite material in the form of a continuous fiber-reinforced thread or a rod, thereby manufacturing a product capable of realizing high mechanical properties.

Generally, the most conventional method for making a continuous fiber-reinforced polymer in a rod or wire form is a drawing method in which a drawing force is applied after glass fibers or carbon fibers are impregnated into a resin in a molten state and passed through a nozzle to make rods of a circular cross section or various cross-sectional shapes other than the circular cross section. Drawing can achieve high productivity and excellent quality, but is a manufacturing method suitable for mass production, requires large and expensive drawing equipment, and can ensure economical unit production cost only while maintaining mass production. Therefore, the drawing is a process unsuitable for a product group requiring a large number of varieties and a small amount of production.

Korean patent laid-open publication No. 2016-0054661 discloses a unidirectional continuous fiber-reinforced thermoplastic composite characterized by being formed by impregnating a thermoplastic resin in a reinforcing fiber having a continuous fiber form, then winding into a circular shape and cutting into a prescribed length, but the process of forming into a rod (rod) form by putting the produced thermoplastic resin composite in a film form into a roll former and winding generally has the following problems: namely, the problems that the film is not wound during the process and is cracked or wrinkled, or the fibers are broken during the process. In order to solve this problem, a plurality of roll formers are required, and a complicated process is required in which the calibers of the inlet and outlet of the roll former must be maintained at a constant ratio and the temperatures of the plurality of roll formers must be independently controlled, or the like.

Korean granted patent No. 0766954 relates to self-impregnationAnd a method of manufacturing the same, and a typical draw forming process is applied as a method of manufacturing the fiber-reinforced polymer bar. This patent discloses the following techniques: in the case of manufacturing a rod having a circular cross section by applying a drawing force after impregnating a continuous fiber in a resin and passing the continuous fiber through a nozzle, in order to form a protrusion on the surface, the second fiber and the third fiber are wound around the outer circumferential surface of the first fiber, but this technique requires a process of winding (weaving) the fibers in a linked manner in addition to the drawing process, and thus requires an expensive apparatus. The drawing forming equipment is large equipment, the unit product cost with economical efficiency can be ensured only by maintaining mass production, and the additional equipment is expensive large equipment, which needs a large amount of initial investment.

Korean patent No. 1714772 relates to a 3D three-dimensional object manufacturing robot which manufactures a 3D three-dimensional object using a material made of a moldable plastic material, and as the material used, a strand (strand), yarn (yarn), tow (tow), bundle (bundle), strip (band), or tape (tape) is exemplified, but no proposal is made for any molding process of compacting (compact) an input material, etc., and no example of practical product application is proposed, and it is impossible to confirm whether or not the quality of strength and rigidity, section, surface uniformity, etc., which can be used as a reinforcing material, is achieved.

As a method capable of using the continuous fiber reinforced composite material in the 3D printer, although r.matsuzak et al (r.matsuzak et al, Scientific Reports (Nature), volume 6 (2016)23058) discloses a technique of improving strength and rigidity of a product, a method of using separate supplies of a continuous fiber bundle and a resin for instantaneous impregnation is used, since an impregnation process is added in a manner of applying heat at a nozzle portion of the 3D printer to melt the supplied thermoplastic resin and instantaneously impregnate it into the independently supplied continuous fibers, there is a problem that the 3D printer apparatus becomes bulky and it is difficult to improve production speed. Since the impregnated state of the thermoplastic resin affects the strength and rigidity of the composite material, it is necessary to maintain a high temperature and high pressure state for a long time to maintain an excellent impregnated state, and if a device generating a high temperature and high pressure state is mounted inside a 3D printer device, it is difficult to maintain and apply the 3D printer device and increase unit cost, and it is difficult to rapidly improve production efficiency and cause a low quality problem.

Disclosure of Invention

Accordingly, the present invention has been made to solve the above problems, and it is desirable to provide a scheme capable of manufacturing a continuous fiber reinforced thermoplastic resin composite material having excellent mechanical properties by a simple method, which can be applied to the production of a reinforcing material for various thermoplastic injection molded products and the production of fiber reinforced thermoplastic products using a 3D printer.

In order to solve the above problems, the present invention provides a continuous fiber reinforced thermoplastic composite material formed in a rod shape by plying intermediate materials of a plurality of yarns (yarn) or tapes (tape).

The present invention also provides a continuous fiber-reinforced thermoplastic resin composite material, characterized in that the porosity of the composite material is 1 to 10 vol%.

The present invention also provides a continuous fiber-reinforced thermoplastic resin composite material, wherein the composite material satisfies the following equation 1 with reference to a cross section of the composite material.

[ mathematical formula 1]

0.2mm^-1≤P/A≤5mm^-1

In mathematical formula 1, P and a are the cross-sectional perimeter and the cross-sectional area of the composite material, respectively.

In addition, the present invention provides a continuous fiber reinforced thermoplastic resin composite material, characterized in that the belt has a thickness of 0.1 to 1.0mm and a width of 3 to 30 mm.

In addition, the present invention provides a continuous fiber reinforced thermoplastic resin composite material, wherein the plying is performed by putting 2 to 10 yarns or 2 to 10 tapes.

Further, the present invention provides a continuous fiber-reinforced thermoplastic resin composite material, wherein the continuous fiber is a glass fiber or a carbon fiber.

In order to solve the above further problem, the present invention provides a method for manufacturing a continuous fiber-reinforced thermoplastic resin composite material, comprising the steps of: (a) continuously feeding a plurality of intermediate materials in the form of yarns (yarn) or tapes (tape) to a heating section; (b) melting at least a part of a thermoplastic resin of a surface of the intermediate material by heating the intermediate material to a temperature of a melting point or higher of the thermoplastic resin contained in the intermediate material; and (c) forming the rod shape by passing two or more molten intermediate materials through a nozzle and stranding the intermediate materials.

The present invention also provides a method for producing a continuous fiber-reinforced thermoplastic resin composite material, wherein the intermediate material contains 30 to 60 wt% of the continuous fibers and 40 to 70 wt% of the thermoplastic resin.

The present invention also provides a method for producing a continuous fiber-reinforced thermoplastic resin composite material, wherein the heating in the step (b) is performed at a temperature 20 to 40 ℃ higher than the melting point of the thermoplastic resin.

The present invention also provides a method for producing a continuous fiber-reinforced thermoplastic resin composite material, wherein the nozzle has a cross-sectional shape free from bending or formed with one or more irregularities.

The present invention also provides a method for producing a continuous fiber-reinforced thermoplastic resin composite material, wherein the continuous fiber-reinforced thermoplastic resin composite material is formed into a spiral shape by rotating the rod discharged through the nozzle.

The present invention also provides a method for producing a continuous fiber-reinforced thermoplastic resin composite material, wherein the nozzle has a diameter ratio of an inlet end to an outlet end of 1.5 to 5, and the nozzle has a length to outlet end diameter ratio of 2 to 10.

Further, the present invention provides a method for manufacturing a continuous fiber reinforced thermoplastic resin composite material, wherein the nozzle is formed in a multi-stage structure and the diameter thereof is reduced toward an outlet side.

According to the present invention, it is possible to provide a continuous fiber-reinforced thermoplastic resin composite material and a method for manufacturing the same, in which a process of plying yarns (yarn) or intermediate materials in the form of tapes (tape) in which continuous fibers are previously impregnated in a thermoplastic resin is used, and high productivity and excellent quality can be realized by a simple plying process without providing a drawing device or a thermoplastic resin impregnation device.

In addition, the method for manufacturing the continuous fiber reinforced thermoplastic resin composite material of the present invention can have various sizes and various sectional shapes by only changing the amount of the intermediate material to be plied and the shape of the nozzle.

Drawings

Fig. 1 and 2 are a sequence diagram and a schematic diagram respectively showing a process for producing a continuous fiber-reinforced thermoplastic composite material according to the present invention.

Fig. 3 is a photograph showing a state in which the intermediate material used in the present invention is put into the heating apparatus according to each mode.

Fig. 4 is a photograph schematically showing nozzles having various inner diameters, various lengths, and various cross-sectional shapes in the present invention.

Fig. 5 is a photograph showing various shapes of the continuous fiber-reinforced thermoplastic resin composite material produced by the present invention.

Fig. 6 is a view schematically showing an internal cross section of a nozzle according to an embodiment of the present invention.

Fig. 7 is a diagram showing the shape of a nozzle according to an embodiment of the present invention.

FIG. 8 is a photograph showing a state where the bending strength was measured in the test example of the present invention.

Fig. 9 and 10 are a photograph of a cross section of an intermediate material and a photograph of a cross section of a composite material in a rod state according to example 10 of the present invention, respectively.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail. In the description of the present invention, a detailed description of related known techniques will be omitted when it may make the gist of the present invention unclear. Throughout the specification, when a certain portion "includes" a certain structural element, unless otherwise stated, it does not exclude other structural elements and means that other structural elements may be further included.

The present inventors have repeatedly studied a scheme for imparting excellent mechanical properties to a continuous fiber-reinforced thermoplastic resin composite material by a simple method, which can be applied to the production of a reinforcing material for various thermoplastic injection-molded products and the production of a fiber-reinforced thermoplastic plastic product using a 3D printer, and as a result, have found that high productivity and excellent quality can be achieved by only a simple stranding process without a draw forming apparatus and a thermoplastic resin impregnation apparatus by using a process of stranding using an intermediate material in the form of a yarn (yarn) or a tape (tape) in which continuous fibers are impregnated in advance in a thermoplastic resin, and have accomplished the present invention.

Accordingly, the present invention discloses a continuous fiber reinforced thermoplastic composite material formed in a rod shape by plying a plurality of yarns (yarn) or an intermediate material of a tape (tape).

The manufacture of the continuous fiber reinforced thermoplastic composite material according to the present invention may comprise the steps of: (a) continuously feeding a plurality of intermediate materials in the form of yarns (yarn) or tapes (tape) to a heating section; (b) melting at least a part of a thermoplastic resin of a surface of the intermediate material by heating the intermediate material to a temperature of a melting point or higher of the thermoplastic resin contained in the intermediate material; and (c) forming the rod shape by passing two or more molten intermediate materials through a nozzle and stranding the intermediate materials.

The present invention will be described in detail below with reference to a process for producing a continuous fiber-reinforced thermoplastic composite material according to the present invention.

Fig. 1 and 2 are a sequence diagram and a schematic diagram respectively showing a process for producing a continuous fiber-reinforced thermoplastic composite material according to the present invention.

Referring to fig. 1 and 2, the method for manufacturing a continuous fiber-reinforced thermoplastic composite material according to the present invention uses a heating device provided with a nozzle, and includes (a) a step (S100) of placing an intermediate material in a heating portion of the heating device; (b) a step (S200) of melting the intermediate material; and (c) passing the molten intermediate material through a nozzle (S300).

In the present invention, the intermediate material 200 inserted into the heating device 100 is a continuous fiber-reinforced thermoplastic composite resin, but is not particularly limited to a thermoplastic resin. For example, polypropylene resin, polyethylene terephthalate resin, polycarbonate resin, polyamide resin, or the like can be used, and polypropylene resin is preferably included. This makes it possible to advantageously improve the strength and impact absorption performance of the intermediate material with respect to cost. The polypropylene resin may include a resin of polypropylene alone or a resin copolymerized with a monomer of a different kind from polypropylene, and for example, may include one selected from the group consisting of a polypropylene homo-polymer resin, a propylene-ethylene copolymer resin, a propylene-butene copolymer resin, an ethylene-propylene-butene copolymer resin, and combinations thereof.

The continuous fibers may be those commonly used by those skilled in the art for producing fiber-reinforced composite materials for improving the strength and rigidity of resins, but preferably may be glass fibers or carbon fibers.

The continuous fibers constituting the continuous fiber reinforced thermoplastic resin composite intermediate material 200 are intermediate materials that are not broken inside but exist in a continuous form. For example, the continuous fibers may be fibers made by a continuous process, like the continuous fibers in UD sheets (unidirection sheet). Therefore, the intermediate material may be a continuous fiber reinforced thermoplastic resin composite intermediate material manufactured by continuously supplying continuous fibers in such a continuous process.

Fig. 3 is a photograph showing a state in which the intermediate material used in the present invention is put into the heating apparatus according to each mode.

Referring to fig. 3, in the present invention, the intermediate material may be in the form of a yarn (yarn) (fig. 2 (a)) or a tape (tape) (fig. 2 (b)).

The yarn is generally a thermoplastic composite material in the form of a noodle (noodle) in which continuous fibers are reinforced in the field of composite material technology, and a composite material sold after drawing is generally used, for example, a yarn is an intermediate material produced in a production process of a long fiber composite material (L FT) generally sold in the thermoplastic composite material market, and an intermediate material having a diameter of 1 to 3mm can be preferably used in the present invention.

The tape form is, for example, a form of a composite material in a slit (slitting) sheet form, and in the present invention, a form having a thickness of 0.1 to 1.0mm and a width of 3 to 30mm is preferably used, a form having a thickness of 0.2 to 0.8mm and a width of 5 to 25mm is more preferably used, a form having a thickness of 0.3 to 0.7mm and a width of 5 to 20mm is even more preferably used, and a form having a thickness of 0.4 to 0.6mm and a width of 5 to 15mm is most preferably used. In the case where the width of the belt-shaped intermediate material is excessively large, wrinkling of the composite material or breakage of the fibers during the process may occur when the intermediate material is put into the heating apparatus.

The present invention does not have an additional drawing device and a thermoplastic resin impregnation device because the process of plying the intermediate material in the form of yarn (yarn) or tape (tape) in which the continuous fibers are impregnated in advance in the thermoplastic resin is used.

Here, 2 to 10, preferably 3 to 8, and more preferably 3 to 6 yarns or tapes can be simultaneously inserted into the heating device within the range of the diameter or the thickness and the width of the yarn (yarn). As the amount of the intermediate material (the number of yarns or tapes) to be put into the fiber bundle increases, the bending strength tends to decrease and the folding efficiency may decrease, but it has been confirmed from the experimental results of the present invention described later that the glass fiber reinforced polypropylene rod to be put into 3 to 6 yarns or tapes and folded always exhibits a high bending strength of 300MPa or more in the above-mentioned range of the amount of the intermediate material to be put into the fiber bundle, and therefore, the fiber bundle can be sufficiently used as a reinforcing rib for a structure.

The intermediate material 200 may be formed by a content ratio of 30 to 60 wt% of the continuous fiber and 40 to 70 wt% of the thermoplastic resin. If the content of the continuous fibers is less than the predetermined range, it is difficult to achieve the desired rigidity-enhancing effect, and if the content is too large, the viscosity of the resin increases during the stranding and nozzle discharge processes, making molding difficult.

The intermediate material 200 in the form of yarn or tape can be continuously unwound and put into the heating apparatus 100 in a state of being wound around a plurality of bobbins (bobbin creel)300 so as to be put into the heating section of the heating apparatus 100 without being entangled with each other.

The intermediate material 200 placed in the heating portion of the heating apparatus 100 is heated and melted in the heating portion. That is, the intermediate material 200 is pre-plied by heating to a temperature not lower than the melting point of the thermoplastic resin contained in the intermediate material 200 to melt at least a part of the thermoplastic resin on the surface of the intermediate material 200.

In this case, the temperature of the heating section 100 is set to be not lower than the melting point of the thermoplastic resin constituting the intermediate material 200, but may be preferably 20 to 40 ℃. For example, in the case of a polypropylene resin having a melting point of 160 ℃, the temperature of the heating part 100 may be set to 180 to 220 ℃. When the temperature of the heating section 100 is set to be less than the melting point or too close to the melting point, the thermoplastic resin on the surface of the composite material is put into the nozzle in a state of not being completely melted, and thus the stranding performance is lowered and the mechanical properties may be lowered, and when the temperature of the heating section 100 is set to be too high, the effect of increasing the mechanical properties may not be large with respect to the increase of the process cost.

The heat source of the heating part 100 is not particularly limited, and, for example, a halogen lamp, a hot air blower, a laser heater, or the like may be used as the heat source.

The intermediate material melted and pre-plied in the heating part 100 is finally plied through a nozzle 400 and molded into a rod shape. That is, at least the intermediate material on the surface of the thermoplastic resin is melted by passing through the heating section 100 and put into the nozzle 400, and the cross-sectional area inside the nozzle is reduced from the cross-sectional area of the heating section and is pressed to be folded and molded into a rod shape.

The material of the nozzle 400 is not particularly limited, and for example, a material having excellent heat resistance and corrosion resistance and excellent wear resistance (hardness of 100HB or more) by being processed from a phosphor bronze material containing 0.05 to 0.5 wt% of phosphor (P) can be used. Further, a material in which the surface inside the nozzle 400 is ground to be precisely corrected to a level of an average surface roughness (Ra) of 1 μm or less may be used, and when the composite material passing through the nozzle 400 is pressed inside the nozzle 400 in this case, material damage due to friction during slipping between the composite material and the nozzle face can be minimized.

In the present invention, as shown in fig. 4, the nozzle 400 can be detachably mounted to the heating device 100, and can be used in various inner diameters, various lengths, and various cross-sectional shapes, and various outlet diameters are applied, so that the cross-sectional size of the continuous fiber reinforced thermoplastic resin composite material 500 in a rod-shaped state to be molded can be changed according to the amount of the intermediate material 200 to be put. Fig. 4 (d) and (i) show a shape in which the internal cross section of the nozzle gradually narrows from the inlet end toward the outlet end.

The nozzle 400 may be applied not only to a simple form of a circular shape having no curvature in the inner diameter cross-sectional shape (see fig. 5 a and 5 d), but also to a nozzle having a circular periphery formed with irregularities such as ribs (rib) or grooves (groove), or may be formed in a thread pattern or a twisted shape on the surface of a rod to be formed when the rod to be discharged is rotated and drawn (see fig. 5 b and 5 c).

The composite material finally manufactured according to various shapes of such a nozzle 400 may satisfy the following mathematical formula 1 on the basis of the cross section.

[ mathematical formula 1]

0.2mm^-1≤P/A≤5mm^-1

In mathematical formula 1, P and a are the cross-sectional perimeter and the cross-sectional area of the composite material, respectively.

In the present invention, the inner cross section of the nozzle 400 may be tapered from the inlet end to the outlet end, and in consideration of the stranding efficiency of the yarn or tape-shaped intermediate material according to the present invention, it is preferable to use a nozzle in which the ratio of the inlet end diameter L2 to the outlet end diameter L1 is 1.5 to 5 and the ratio of the length L3 to the outlet end diameter L1 is 2 to 10 (see fig. 6).

Further, it is considered that a nozzle system in which a decrease in productivity due to a load caused by pressing (compact) of a composite material when passing through the nozzle 400 and a decrease in mechanical properties due to an increase in porosity caused by insufficient pressing can be improved. That is, in the present invention, the nozzle 400 is formed in multiple stages and has a diameter that decreases toward the outlet side, and thus, the mechanical properties can be further improved while smoothly performing the compression by adjusting the compression time of the composite material (see fig. 7).

The continuous fiber-reinforced thermoplastic composite 500 manufactured according to the present invention may have a porosity of a predetermined level, i.e., a level of 1 to 10 vol%, and preferably may have a porosity of a level of 1 to 5 vol%. In the case where the composite material is intended to be manufactured to have a porosity of less than 1 vol%, heating at a temperature higher than necessary may be required, which may result in a reduction in productivity without an additional increase in strength of the finally manufactured composite material 500 in a rod form. Further, in the case where the porous material is intended to be produced to have a porosity of more than 10 vol%, the productivity may be improved, but it may be difficult to satisfy the required mechanical properties.

The continuous fiber-reinforced thermoplastic composite material manufactured according to the present invention uses a process of plying a yarn or a ribbon-shaped intermediate material using a nozzle without using a plurality of roll formers having a high fraction defective as in the related art, and thus can realize high productivity and excellent quality by a simple plying process without providing a drawing apparatus or a thermoplastic resin impregnation apparatus.

Further, the composite material according to the present invention is manufactured by a process of plying the yarn (yarn) or tape (tape) form intermediate material in which the continuous fibers are impregnated in advance in the thermoplastic resin, and thus a rod-form composite material product suitable for various applications such as a material for a reinforcing bar or a material for a 3D printer can be manufactured with high productivity and at low cost in a product group requiring small-scale and various-type production.

The present invention will be described in more detail below by taking examples of the present invention as examples.