JPH06270271A - Molding material of liquid crystal resin composite and molding method using same - Google Patents

Abstract

PURPOSE:To effectively suppress the involution of air when a resin molded product is molded using a strand of a liquid crystal resin composite. CONSTITUTION:A liquid crystal resin composite is formed by performing molding by using a strand like molding material wherein a thermoplastic liquid crystal resin L1 having liquid crystal transition temp. higher than the lowest moldable temp. of a thermoplastic matrix resin M1 is present in the matrix resin in a fibrous state. At this time, a strans S1 wherein the liquid crystal resin is present in a state unevenly distributed to the central part of the cross section of the strand is produced and only the outer peripheral part of the strand is heated to the temp. range from the lowest moldable temp. of the matrix resin to below the liquid crystal transition temp. of the liquid crystal resin in a process before or after the strand is wound around a mandrel to perform filament winding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material for molding a liquid crystal resin composite, and more particularly to a strand-shaped molding material made of a liquid crystal resin composite and a molding method using the so-called filament winding method.

[0002]

2. Description of the Related Art Conventionally, as a molding method for molding using a fiber reinforced resin material, a strand-shaped molding material in which a fiber reinforced material is impregnated with a resin is regularly formed on the outer peripheral side of a rotating mandrel. After forming a molded body with a predetermined thickness by winding it around, the resin impregnated in the strand is cured and the mandrel is removed to obtain a hollow cylindrical molded product, a so-called filament winding method. Is generally well known. According to this filament winding method, it is possible to obtain a hollow-cylindrical fiber-reinforced resin molded product having a high specific strength (strength / density) and excellent mechanical properties. Further, such a resin molded product has high efficiency. It enables mass production.

By the way, in recent years, it has been proposed to use a thermoplastic liquid crystal resin as a reinforcing fiber of a fiber-reinforced resin material. For example, Japanese Patent Application Laid-Open No. 62-116666 discloses a liquid crystal resin composite in which a thermoplastic liquid crystal resin is used as a reinforcing fiber and is formed into a fibrous shape.
When a thermoplastic liquid crystal resin is used as the reinforcing fiber in this way, when the used and discarded resin molded product is recycled, the thermoplastic liquid crystal resin fiber as the reinforcing fiber is cut along with the crushing of the resin molded product. Also, by heating to a temperature above the liquid crystal transition temperature of the liquid crystal resin to prepare the material,
The fibrous state of the liquid crystal resin as a reinforcing material can be easily reproduced, and it has been generally difficult with fiber-reinforced resin molded products such as glass fiber and carbon fiber to date, and recyclability can be regenerated into a material with similar physical properties. It is possible to achieve a significant improvement in

[0004]

When the above filament winding method is applied when molding the liquid crystal resin composite having the above-mentioned thermoplastic liquid crystal resin as the reinforcing fiber as a molding material, the reinforcing fiber is used as the thermoplastic liquid crystal. By using a resin, compared to the case where other fiber materials such as glass fiber or carbon fiber are conventionally used as reinforcing fibers, voids are more likely to occur in the resin molded product, and mechanical properties such as strength and rigidity are stable. There was a problem that it was difficult to get. The problem of the void may be slightly experienced even when the conventional reinforcing fiber is used, but when the liquid crystal resin is used as the reinforcing fiber, it is particularly remarkable due to the following reasons. Of.

That is, the above-mentioned thermoplastic liquid crystal resin composite is formed by orienting a thermoplastic liquid crystal resin having a liquid crystal transition temperature higher than the minimum moldable temperature of the matrix resin in a thermoplastic matrix resin in a fiber state. However, when the liquid crystal resin composite is heated to the molding temperature for molding, the heating temperature range is set to the minimum moldable temperature (crystallinity) of the matrix resin in order to maintain the fibrous state of the liquid crystal resin. However, it is necessary to limit the temperature to a temperature above the melting point) and below the liquid crystal transition temperature of the above liquid crystal resin. Therefore, the matrix resin cannot be heated to a very high temperature, and the matrix resin is molded while its viscosity is relatively high. Therefore, it is difficult for the entrained air to be discharged due to the flow of the matrix resin. In addition, air is likely to be caught in the molding process. Further, in the strand of the liquid crystal resin composite, since the reinforcing fiber is thermoplastic, it is unavoidable that when heated, it is loosened to some extent and the tensile strength is lowered, and it is difficult to give an appropriate tension. For this reason, it is difficult to effectively eliminate the air present between the fibers, and this remains as voids in the molded product.

The present invention has been made in view of the above problems, and when molding a resin molded product using a strand of a liquid crystal resin composite, it is possible to effectively suppress entrainment of air during molding. An object is to provide a material for molding a resin composite and a molding method using the same.

[0007]

Therefore, the material for molding the liquid crystal resin composite according to the first invention of the present application has a liquid crystal transition temperature higher than the minimum moldable temperature of the matrix resin in the thermoplastic matrix resin. A material for molding a strand-shaped liquid crystal resin composite in which a thermoplastic liquid crystal resin having a fiber is present, wherein the liquid crystal resin exists in a state of being unevenly distributed in a central portion in a cross section of the molding material. It is characterized by being present.

The second invention of the present application is the molding material of the liquid crystal resin composite according to the first invention, wherein the molding material comprises a matrix resin at the central portion and the outer peripheral portion thereof. It is characterized by different materials.

Furthermore, the third invention of the present application is the molding material for the liquid crystal resin composite according to the above-mentioned first invention, in which the outermost part of the molding material can be molded at a minimum by an insulating layer. The coating layer is formed of a thermoplastic resin whose temperature is lower than the liquid crystal transition temperature of the liquid crystal resin.

Further, a fourth invention of the present application is the molding material for the liquid crystal resin composite according to the third invention,
The thermoplastic resin of the coating layer is a resin material different from the thermoplastic matrix resin inside the heat insulating material layer.

Further, in the molding method according to the fifth invention of the present application, a thermoplastic liquid crystal resin having a liquid crystal transition temperature higher than the minimum moldable temperature of the matrix resin is present in a fibrous state in the thermoplastic matrix resin. A molding method for molding by a filament winding method using a molding material of a liquid crystal resin composite in the form of a strand, wherein the liquid crystal resin prepares a molding material that exists in a state of being unevenly distributed in the central portion in the cross section, Before and / or after winding the molding material around the mandrel, only the outer peripheral portion of the molding material is at least the minimum moldable temperature of the matrix resin and less than the liquid crystal transition temperature of the liquid crystal resin. It is characterized in that the filament winding is performed by heating within the temperature range of.

[0012]

According to the first invention of the present application, the liquid crystal resin is present in a state of being unevenly distributed in the central portion in the cross section of the molding material, so that the outer peripheral portion outside the central portion is Can improve the fluidity during heating. Therefore, when molding is performed using this molding material, the outer peripheral portions of the molding material easily fit together, and the outer peripheral portions of the molding material can adhere to each other without a gap while pushing out the air interposed between the molding materials. That is, even if the tension and the heating temperature that can be applied to the molding material are limited by using the thermoplastic liquid crystal resin as the reinforcing fiber, the generation of voids between the fibers can be effectively suppressed. Further, the adhesion between the molding materials can be increased.

Further, according to the second invention of the present application, basically, the same effect as that of the first invention can be obtained. Moreover, since the resin material of the matrix resin is made different between the central portion and the outer peripheral portion, the thermoplastic matrix resin of the outer peripheral portion is more easily softened and melted than the thermoplastic matrix resin of the central portion. By adopting such a material, when the above molding material is heated, the matrix resin in the outer peripheral portion is more easily fluidized, so that the gap between the molding materials can be more easily filled, and the liquid crystal fiber There is less room for air to intervene. That is, the generation of voids between fibers can be suppressed more effectively.

Further, according to the third invention of the present application, basically, the same effect as that of the first invention can be obtained. Moreover, in particular, since a coating layer made of a thermoplastic resin whose minimum moldable temperature is lower than the liquid crystal transition temperature of the liquid crystal resin is formed on the outer peripheral portion of the molding material through the heat insulating material layer, It is possible to heat the inner part of the layer (thus, the liquid crystal resin existing in the central part) while insulating it. That is, it is possible to further enhance the fluidity of the outer peripheral portion outside the heat insulating material layer during heating while ensuring the strength of the liquid crystal fibers located inside the heat insulating material layer.

Further, according to the fourth invention of the present application,
Basically, the same effect as that of the third invention can be obtained. Moreover, in particular, since the thermoplastic resin of the coating layer is a resin material different from the thermoplastic matrix resin inside the heat insulating material layer, the thermoplastic resin inside the heat insulating material layer is used as the thermoplastic resin of the coating layer. By adopting a material that softens and melts more easily than a resin, when the molding material is heated, the coating layer located on the outer peripheral portion of the molding material becomes easier to fluidize, so that the gap between the molding materials is increased. The parts are more easily filled, and the room for air to intervene between the liquid crystal fibers becomes smaller. That is, the generation of voids between fibers can be suppressed more effectively.

Further, according to the fifth invention of the present application, since the molding material is present in a state where the liquid crystal resin is unevenly distributed in the central portion in the cross section, the outer peripheral portion outside the central portion is The fluidity during heating is high. Then, only the outer peripheral portion of this molding material is heated to a temperature above the minimum moldable temperature of the matrix resin and below the liquid crystal transition temperature of the liquid crystal resin to perform filament winding. When the molding material is wound around the mandrel, the outer peripheral portions thereof easily fit in with each other, and the outer peripheral portions of the molding material can adhere to each other without a gap while pushing out the air interposed between the molding raw materials. That is, even if the tension and the heating temperature that can be applied to the molding material are limited by using the thermoplastic liquid crystal resin as the reinforcing fiber, the generation of voids between the fibers can be effectively suppressed. Further, the adhesion between the molding materials can be increased. Moreover, in this case, since only the outer peripheral portion of the molding material is heated, the filament winding can be performed while ensuring the strength of the liquid crystal fibers existing in the central portion.

[0017]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is an explanatory view schematically showing the overall configuration of a molding apparatus for molding by a filament winding method using a strand-shaped molding material of a liquid crystal resin composite according to this example. As shown in this figure, the molding apparatus 1 includes an extrusion device 2 for extruding a liquid crystal resin composite in a strand shape, a cooling tank 3 for cooling the extruded strand S1, and a downstream portion while extending the extruded strand S1. A pair of take-up rollers 4 drawn out to the side, a tension controller 5 for adjusting the tension of the strand S1 drawn by the take-up rollers 4, 4, and a strand S1 whose tension is adjusted by the tension controller 5 are wound. Mandrel 6 and Strand S
The mandrel 6 is provided with a delivery barrier 8 for positioning the mandrel 6 at the time of winding the mandrel 6, and a heater 7 for heating the strand S1 to a predetermined temperature when the mandrel 6 is wound or after the mandrel 6 is wound. Although not specifically shown, the molding apparatus 1 is provided with a control unit including, for example, a microcomputer as a main part in order to comprehensively control the operation of each of the components. There is.

The extruding device 2 is a supply means for supplying the strand S1 of the liquid crystal resin composite to the mandrel 6 side. In this embodiment, the extruding device 2 is a first and a second arranged substantially in parallel. It is configured by combining the extruders 21 and 31 of. Each of these extruders 21 and 31 has rotating screws 23 and 33 housed inside hollow cylindrical main bodies 22 and 32, respectively, and the extrusion nozzle 34 (second extrusion nozzle) of the second extruder 31 is The nozzle diameter is set to be smaller than that of the extrusion nozzle 24 (first extrusion nozzle) of the first extruder 21, and the first extruder is bent and extended from the tip side of the main body portion 32 into a substantially L shape. The extrusion nozzle 24 of 31 is arranged so that the central axis in the longitudinal direction thereof substantially coincides with that of the extrusion nozzle 24.

From the hopper 36 of the second extruder 31, a fibrous thermoplastic liquid crystal resin L1 polymer having a predetermined length and a minimum moldable temperature (crystal) lower than the liquid crystal transition temperature of the liquid crystal resin L1 are used. Of a thermoplastic matrix resin M1 having a melting point), the pellet containing only the thermoplastic matrix resin M1 having a melting point) is charged and the rotating screw 33 is driven at a predetermined rotation speed. The pellets are plasticized and melted, and a strand-shaped liquid crystal resin composite in which the liquid crystal fibers L1 are oriented is extruded into the matrix resin M1 from the second extrusion nozzle 34. On the other hand, from the hopper 26 of the first extruder 21, the same pellets as those charged to the second extruder 31 are charged,
By driving the rotary screw 23 at a predetermined rotation speed, the introduced pellets of the thermoplastic matrix resin M1 are plasticized and melted, and the pellets of the liquid crystal resin composite are extruded by the second extruder 31 to the outer periphery. The coating layer made of only the thermoplastic matrix resin M1 is coaxially formed. As a result, as can be seen from FIG. 3, the thermoplastic liquid crystal resin L1 is unevenly distributed in a fiber state in the substantially central portion of the cross section, and the strand-shaped liquid crystal resin composite S1 whose outer peripheral side is covered with the matrix resin M1 is extruded. It is supposed to be.

In this embodiment, the thermoplastic liquid crystal resin L1 is used.
And as the thermoplastic matrix resin M1, for example,
The following were used. -Thermoplastic liquid crystal resin L1-Material name: Aromatic polyester resin-Product name: Vectra A950 (manufactured by Polyplastics Co., Ltd.)-Liquid crystal transition temperature: 280 ° C-Thermoplastic matrix resin M1-Material name: Olefin resin-Product name : Noblen D501 (Sumitomo Chemical Co., Ltd.)-Melting point: About 155 ° C (normal molding temperature 200 ° C)

In the second extruder 31, the strand S1 is
As a molding material for extruding, instead of separately charging the matrix resin M1 pellets and the liquid crystal fibers L1 into the hopper 36 as described above, a liquid crystal resin composite pellet formed by both is prepared in advance. Alternatively, the pellets may be supplied from the hopper 36 to the extruder 31. The strand supply means is not limited to the extrusion device 2 as described above, and for example, the extrusion device 2
It is also possible to wind the strand extruded by the so-called bobbin and supply it from the bobbin to the mandrel 6 side. This also applies to other embodiments described later.

The strand S1 extruded from the extruding device 2 is stretched by the action of the take-up rollers 4 and 4 to a predetermined stretch ratio, then cooled in the cooling tank 3, and then downstream by the take-up rollers 4 and 4. Side (mandrel 6 side). The tension controller 5 includes a pair of so-called dancer rollers 16A and 16B and one roller 16B.
And a movable arm 17 for adjusting the position of the dancer roller 16B. For example, by driving the movable arm 17 to adjust the position of the lower dancer roller 16B in the drawing,
The tension of the strand S1 can be adjusted appropriately.

The mandrel 6 is rotatably driven by a driving device (not shown), and in the vicinity of both ends thereof, for example, a pin 19, as a folding portion for folding the strand S1 at the portion, A large number of 19 are erected in the radial direction of the mandrel 6,
The strand S1 wound up to one end is locked by one of these pins 19, ..., 19 and then folded back, and is wound in the opposite direction with respect to the longitudinal direction of the mandrel 6. By repeating such a reciprocating operation, the strand S1 is laminated and wound on the outer peripheral side of the mandrel 6.

The strand S1 to which a predetermined tension has been applied by the tension controller 5 is regularly wound around the outer periphery of the mandrel 6 while being positioned by the delivery barrier 8. Then, for example, at the time of this winding, by the heater 7, a temperature range above the minimum moldable temperature of the thermoplastic matrix resin M1 and below the liquid crystal transition temperature of the thermoplastic liquid crystal resin L1 (so-called mold window).
While being heated to a predetermined temperature inside, only the matrix resin M1 around the liquid crystal fiber L1 is wound in a softened state. The heater 7 may be installed between the tension controller 5 and the mandrel 6.

Since the strand S1 according to the present embodiment is formed such that the liquid crystal fibers L1 are present in a state of being unevenly distributed in the central portion in the cross section of the strand, the matrix resin M1 alone is used for the outer peripheral portion outside the central portion. It has a high fluidity when heated. Therefore, when the filament winding molding is performed using the strands S1, the outer peripheral portions of the strands S1 easily fit into each other, and the outer peripheral portions of the adjacent strands S1 can be adhered to each other without a gap while pushing out the air present between the adjacent strands S1. Become. That is, even when the tension and the heating temperature that can be applied to the strand S1 are limited by using the thermoplastic liquid crystal resin L1 as the reinforcing fiber, the generation of voids between the fibers can be effectively suppressed. Further, the adhesion between the strands S1 can be improved. Further, in this way, by forming the outer peripheral portion with only the same resin material as the matrix resin M1 in the central portion, it is possible to mold a strand in which the content ratio of the liquid crystal resin L1 is suppressed to be low.

The above embodiment (hereinafter referred to as the first embodiment)
Used the same matrix resin M1 for the central portion of the strand S1 and the outer peripheral portion thereof, but by using a different matrix resin for the outer peripheral portion from the central portion, a more remarkable effect is obtained. It becomes possible to play. The second embodiment of the present invention will be described below. In the following description, the same components as those in the first embodiment are designated by the same reference numerals and further description is omitted. In this embodiment, as shown in FIG. 4, a strand S2 ′ formed by dispersing a thermoplastic liquid crystal resin L2 in a fibrous state in a thermoplastic matrix resin M2 by the same extruder 2 as in the first embodiment. The outer peripheral side of
Thermoplastic resin M3 different from the matrix resin M2
The liquid crystal resin composite S2 in the form of a strand covered with is extruded. As the thermoplastic matrix resin M2 and the thermoplastic resin M3, those whose minimum moldable temperature is lower than the liquid crystal transition temperature of the thermoplastic liquid crystal resin L2 are used.

In this embodiment, more preferably, a resin material having a higher absorption efficiency during microwave heating than the matrix resin M2 in the central portion is adopted as the thermoplastic resin M3 on the outer peripheral side of the strand S2. An example of the thermoplastic liquid crystal resin L2, the thermoplastic matrix resin M2, and the thermoplastic resin M3 used in this example is shown below. -Thermoplastic liquid crystal resin L2-Material name: Aromatic polyester resin-Product name: Vectra A950 (manufactured by Polyplastics Co., Ltd.)-Liquid crystal transition temperature: 280 ° C-Thermoplastic matrix resin M2-Material name: Olefin resin-Product name : Noblen D501 (Sumitomo Chemical Co., Ltd.)-Melting point: About 155 ° C (normal molding temperature 200 ° C) -Thermoplastic resin M3-Material name: Polyamide resin-Product name: Nylon 1013B (Ube Industries Ltd.)-Melting point : About 215 ℃ (Normal molding temperature 230 ℃)

Strand S2 constructed as described above
Is a predetermined temperature (for example, 230 ° C.) higher than or equal to the melting point of the thermoplastic matrix resin M2 or the melting point of the thermoplastic resin M3 by microwave heating and lower than the liquid crystal transition temperature of the thermoplastic liquid crystal resin L2. When heated to
Due to the difference in heat absorption efficiency between the polyamide resin and the olefin resin, only the outer thermoplastic resin M3 is softened and melted.
Therefore, in this case, the gap between the strands S2 is more easily filled, and the room for air to intervene between the strands S2 is further reduced. That is, the generation of voids can be suppressed more effectively. In this case, even if the outer peripheral portion is softened and melted due to the difference in heat absorption efficiency between the central portion matrix resin M2 (olefin resin) and the outer peripheral portion thermoplastic resin M3 (polyamide resin) at the time of microwave heating, It is possible to suppress heat input to the device to a relatively small level, and also to secure the strength of the liquid crystal fibers L2 dispersed in the central portion.

In particular, when the strands are wound around the mandrel 6, the above-described reciprocating operation causes the strands to cross each other obliquely and overlap each other, and generally, at a predetermined interval in the longitudinal direction of the mandrel 6. It is known that although a crossing portion is formed, since the strand usually has a circular cross section, the height locally increases at this crossing portion, and air is likely to be accumulated in the vicinity. When the strand S2 according to the present embodiment is used,
As shown in FIG. 5, since the thermoplastic resin M3 in the outer peripheral portion is softened and melted, the outer peripheral portions can bite into each other until the central portions S2 ′ overlap each other. The height becomes low, and it becomes difficult for air to collect in this part. That is, it is possible to suppress the occurrence of voids at the intersection Cs2.

Next, a third embodiment of the present invention will be described. In this embodiment, as shown in FIG.
A coating layer is formed on the outer periphery of the heat insulating material layer G. That is, between the thermoplastic resin M3 on the outer peripheral side and the strand S3 'in the central portion, in which the thermoplastic liquid crystal resin L3 is dispersed in the thermoplastic matrix resin M4 in a fibrous state, for example, a small amount of glass is used. A heat insulating material layer G composed of hollow balls (so-called glass balloons) is provided. In this example, the thermoplastic liquid crystal resin L3 and the thermoplastic matrix resin M4 of the strand S3 ′ in the central portion are used.
And as the thermoplastic resin M5 of the outer peripheral portion, for example,
The same materials as those used in the second embodiment can be used.

In this case, the portion outside the heat insulating material layer G can be more efficiently heated by microwave heating in the same manner as in the case of the second embodiment, but especially in the case of the present embodiment. Can heat the inner part of the heat insulating material layer G (thus, the liquid crystal resin L3 existing in the central part S3 ′) while insulating it. That is, while ensuring the strength of the liquid crystal fibers L3 located inside the heat insulating material layer G, the fluidity of the outer peripheral portion outside the heat insulating material layer G during heating can be further enhanced. Also,
As shown in FIG. 7, at the intersecting portion Cs3, the thermoplastic resin M5 in the outer peripheral portion is softened and melted, so that the outer peripheral portions can bite into each other until the heat insulating material layers G overlap with each other. The height of the intersection Cs3 becomes low, and it becomes difficult for air to collect in this portion. That is,
Generation of voids at the intersection Cs3 can be suppressed.

[Brief description of drawings]

FIG. 1 is an explanatory diagram schematically showing the overall configuration of a molding apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory cross-sectional view of an extrusion device provided in the molding device.

FIG. 3 is a cross-sectional explanatory view of a strand according to the first embodiment.

FIG. 4 is a cross-sectional explanatory view of a strand according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a crossing portion of a strand according to the second embodiment.

FIG. 6 is a cross-sectional explanatory view of a strand according to a third embodiment of the present invention.

FIG. 7 is a perspective view showing an intersecting portion of a strand according to the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Molding apparatus 2 ... Extrusion apparatus 6 ... Mandrel G ... Insulating material layer L1, L2, L3 ... Thermoplastic liquid crystal resin M1, M2, M4 ... Thermoplastic matrix resin (central part) M3, M5 ... Thermoplastic matrix resin (outer periphery) Part) S1, S2, S3 ... Strand

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuhisa Fuji No. 3 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) Masatoshi Shinomori No. 3 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Corporation Within

Claims (5)

[Claims] 1. A material for molding a strand-shaped liquid crystal resin composite, in which a thermoplastic liquid crystal resin having a liquid crystal transition temperature higher than the minimum moldable temperature of the matrix resin is present in a fibrous state in the thermoplastic matrix resin. A liquid crystal resin composite molding material, wherein the liquid crystal resin is present in a state of being unevenly distributed in a central portion of a cross section of the molding material. 2. The molding material for a liquid crystal resin composite according to claim 1, wherein the molding material is different in matrix resin material between the central portion and the outer peripheral portion thereof. Material for molding liquid crystal resin composites. 3. The molding material of the liquid crystal resin composite according to claim 1, wherein a minimum moldable temperature is a liquid crystal transition of the liquid crystal resin at an outer peripheral portion of the molding material via a heat insulating material layer. A material for molding a liquid crystal resin composite, characterized in that a coating layer made of a thermoplastic resin whose temperature is lower than the temperature is formed. 4. The material for molding a liquid crystal resin composite according to claim 3, wherein the thermoplastic resin of the coating layer is a resin material different from the thermoplastic matrix resin inside the heat insulating material layer. Material for molding liquid crystal resin composites characterized by 5. A material for molding a strand-shaped liquid crystal resin composite, in which a thermoplastic liquid crystal resin having a liquid crystal transition temperature higher than the minimum moldable temperature of the matrix resin is present in the thermoplastic matrix resin in a fibrous state. Is a molding method of performing molding by filament winding method using, the above-mentioned liquid crystal resin to prepare a molding material present in a state of being unevenly distributed in the central portion in the cross section, before and after winding this molding material around the mandrel. In at least one of the steps, only the outer peripheral portion of the molding material is heated to a temperature range not lower than the minimum moldable temperature of the matrix resin and lower than the liquid crystal transition temperature of the liquid crystal resin to perform filament winding. A molding method characterized by the above.