JPH0899350A - Blow molding method for liquid crystal resin composite - Google Patents

Abstract

PURPOSE: To prevent drawdown effectively without impairing moldability in blow molding by a method wherein a resin molded product of a high recycling property can be obtained in execution of blow molding. CONSTITUTION: A molding resin material containing thermoplastic matrix resin, and a fiber Fr prepared by spin-molding of thermoplastic liquid crystal resin having a liquid crystal transition temperature higher than lowest moldable temperature of the thermoplastic matrix resin are compounded at a temperature within a range from thermoplastic matrix resin's lowest moldable temperature to liquid crystal transfer temperature of the thermoplastic liquid crystal resin, and extruded as a parison 10. Then, the parison 10 is blow molded at a temperature withe. in a range from the thermoplastic matrix resins lowest moldable temperature to the liquid crystal transfer temperature of the thermoplastic liquid crystal resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for blow molding a liquid crystal resin composite using liquid crystal resin fibers as a fiber reinforcement.

[0002]

2. Description of the Related Art Conventionally, when molding a resin molded product,
A method of obtaining a synthetic resin molded article having high strength and high rigidity by mixing a fiber reinforcing material such as glass fiber or carbon fiber into a matrix resin is generally well known. Further, it is known that a liquid crystal resin exhibiting liquid crystallinity in a molten state can be applied as a fiber reinforcing material. For example, in JP-A-62-116666, a thermoplastic liquid crystal resin contains a fibrous thermoplastic liquid crystal resin. A so-called in-situ molding method is disclosed in which both are extruded and molded so that In addition, in this in-situ molding method, in order to obtain a composite in which the liquid crystal resin is satisfactorily fiberized in the matrix resin, it is necessary to keep the shear rate at the time of extrusion at a certain level or more and further stretch it. .

Further, in JP-A-1-320128, a composite material comprising a thermoplastic matrix resin and a liquid crystal resin (liquid crystal polymer) is extruded while being stretched at a temperature higher than the liquid crystal transition temperature of the liquid crystal resin. The obtained strand is cut into a length of 1 to 40 mm, and the cut product thus obtained is in a 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 (hereinafter, this range is referred to as a mold window). A method of extrusion at a temperature in () is disclosed. Further, when a thermoplastic liquid crystal resin is molded by a synthetic fiber spinning molding method, compared with a liquid crystal fiber formed by the in situ molding in which the liquid crystal resin is fiberized in the matrix resin by coextrusion molding with the matrix resin. Therefore, it is possible to obtain liquid crystal fibers with a considerably large diameter, and it is difficult to break even when shearing acts during molding, and because it has relatively high tensile strength and other physical properties even during hot working, the reinforcing effect is greatly improved. It is known that it can be used as a reinforcing fiber for an improved liquid crystal resin.

By the way, in recent years, from the viewpoint of resource protection, etc.
It is desired to recycle (remold) used resin molded products. In the case of recycling a resin molded product, the molded product is crushed to obtain a crushed piece of synthetic resin, the crushed piece is heated and melted, and then the molten synthetic resin material is formed into a predetermined shape. A recycled molding material can be obtained by molding into a molded product or extruding a molten synthetic resin. Then, a remolded product having a predetermined shape is molded using the recycled molding material.

However, in the case of recycling a resin molded product containing glass fibers or carbon fibers as a fiber reinforcing material as described above, the reinforcing fibers mixed in the synthetic resin body when the resin molded product is crushed are cut into short pieces. Therefore, the remolded product obtained by recycling has a drawback in that it is inevitable in terms of strength and rigidity as compared with the original molded product.

By the way, as one of molding methods for molding a hollow resin molded article, a thermoplastic resin material is preformed into a predetermined hollow shape such as a cylindrical shape by extrusion or injection.
By blowing a gas such as compressed air into the parison while sandwiching the preform in the softened state (parison) between the molds, the parison is expanded along the mold molding surface and is cooled and solidified to form a hollow. The so-called blow molding method for obtaining a resin molded product is generally well known. By adopting this molding method, it is possible to obtain a molded product of stable quality with high productivity, especially in mass production.

In the blow molding method, burrs are formed between the accumulator head for pushing out the parison and the upper pinch for gripping the upper side of the molded product and between the lower pinch for gripping the lower side of the molded product and the lower end of the parison. Therefore, the yield of the material is originally low, and in many cases, the burr is reused as a molding material to reduce the waste of the material.

[0008]

However, when a molded product having high physical properties is to be molded by the blow molding method using a resin material containing glass fiber or carbon fiber as a fiber reinforcement, Even if burr is recycled, as mentioned above, the use of recycled materials is limited because the reinforcing fibers are damaged, and the yield of the material as a whole cannot be improved sufficiently. Along with the problem, there is a problem that a large amount of material is wasted during molding.

With regard to such a problem, the inventors of the present invention have proposed a liquid crystal resin as a molded product formed from a composite material of a thermoplastic resin and a liquid crystal resin having a liquid crystal transition temperature higher than the moldable temperature of the thermoplastic resin. A crushed piece obtained from the composite is extruded at a temperature above the liquid crystal transition temperature of the liquid crystal resin to obtain a molding material, and the molding material is formed into a predetermined shape at a temperature lower than the liquid crystal transition temperature of the liquid crystal resin. When a molded product is obtained by molding, or the crushed pieces obtained as described above are molded into a predetermined shape at a temperature not lower than the liquid crystal transition temperature of the liquid crystal resin to obtain a molded product, the molded product It has been found that the strength and the rigidity of are substantially the same as the strength and the rigidity of the molded product before crushing.

When blow molding is performed, a so-called drawdown phenomenon may occur in which the parison extruded from the accumulator head hangs down due to its own weight. However, by reinforcing the parison by compounding a fiber reinforced material, To prevent the occurrence of drawdown,
Generally, there is a problem that the viscosity of the parison becomes too high and the parison does not hang down properly, making molding by blow molding difficult.

The present invention has been made in view of the above problems, and when blow molding is performed, a resin molded article having high recyclability can be obtained, and the moldability during blow molding is not impaired. An object of the present invention is to provide a blow molding method for a liquid crystal resin composite, which can effectively prevent drawdown.

[0012]

For this reason, the invention according to claim 1 of the present application (hereinafter referred to as the first invention) includes a molding resin material containing a thermoplastic matrix resin and a thermoplastic matrix resin. A fiber formed by spin molding of a thermoplastic liquid crystal resin having a liquid crystal transition temperature higher than the minimum moldable temperature, and having a temperature not lower than the minimum moldable temperature of the thermoplastic matrix resin and lower than the liquid crystal transition temperature of the thermoplastic liquid crystal resin. A composite is extruded at a temperature within the range and extruded as a parison, and the parison is blow-molded at a temperature not lower than the minimum moldable temperature of the thermoplastic matrix resin and lower than the liquid crystal transition temperature of the thermoplastic liquid crystal resin. It is the one.

The invention according to claim 2 of the present application (hereinafter,
The second invention) is characterized in that, in the first invention, the molding resin material contains a liquid crystal resin composite in which thermoplastic liquid crystal resin fibers are molded in situ. is there.

The invention according to claim 3 of the present application (hereinafter,
In the first invention, the molding resin material is a second thermoplastic resin having a liquid crystal transition temperature lower than that of the first thermoplastic liquid crystal resin constituting the fiber formed by the spin molding. A liquid crystal containing a plastic liquid crystal resin, wherein the parison has a temperature above the minimum moldable temperature of the thermoplastic matrix resin and above the liquid crystal transition temperature of the second thermoplastic liquid crystal resin, and above the first thermoplastic liquid crystal resin. The second thermoplastic resin is extruded at a temperature lower than the transition temperature, and the second thermoplastic liquid crystal resin is molded in situ during the extrusion of the parison.

Furthermore, the invention according to claim 4 of the present application.
(Hereinafter, referred to as a fourth invention) is characterized in that, in the third invention, the parison is forcibly pulled down to a predetermined vertical position while being stretched.

The invention according to claim 5 of the present application
(Hereinafter, referred to as a fifth invention) is characterized in that, in the fourth invention, the parison is pulled down while being rotated about an axis line in the longitudinal direction.

Furthermore, the invention according to claim 6 of the present application.
(Hereinafter, referred to as a sixth invention) is, in the above-mentioned third invention, a bag-shaped parison is extruded to an upper and lower position corresponding to an intermediate position of the mold surface of the molding die, and the parison is expanded along the mold surface. It is characterized in that it is blow-molded while being made.

Furthermore, the invention according to claim 7 of the present application.
(Hereinafter, referred to as a seventh invention), in any one of the first to sixth inventions, the fiber formed by the spin-molding of the thermoplastic liquid crystal resin is a long fiber, and in the extrusion direction of the parison. It is characterized in that the parison is compounded substantially along the line.

[0019]

According to the first aspect of the present invention, the parison is extruded by compounding the above-mentioned molding resin material containing a thermoplastic matrix resin and the liquid crystal resin fiber formed by spin molding. By blow molding this, it is possible to obtain, by blow molding, a resin molded product having high physical properties that can be recycled while maintaining strength and rigidity at substantially the same level. Further, by reinforcing the parison with the liquid crystal resin fiber, it is possible to effectively prevent the so-called drawdown phenomenon in which the parison hangs down due to its own weight. In this case, since the composite of the matrix resin and the liquid crystal resin fiber formed by spin molding and the blow molding are performed at the temperature in the mold window, there is no risk of causing breakage of the liquid crystal fiber due to heat, and, in particular, Since the spun-molded liquid crystal fibers are compounded, a liquid crystal resin molded product having a higher reinforcing effect can be obtained.

Further, according to the second invention of the present application, basically, the same effect as that of the first invention can be obtained. Moreover, in addition to the liquid crystal resin fiber formed by the spin molding, the molding resin material contains a liquid crystal resin composite formed by in-situ molding of the thermoplastic liquid crystal resin fiber. The liquid crystal resin content can be increased, and the physical properties of the molded product can be further improved.

Further, according to the third invention of the present application, basically, the same effect as that of the first invention can be obtained. Moreover, since the molding resin material contains the second thermoplastic liquid crystal resin in addition to the liquid crystal resin (first thermoplastic liquid crystal resin) fiber formed by the spin molding, the parison is formed. The liquid crystal resin content of can be increased,
The physical properties of the molded product can be further improved. In this case, since the second thermoplastic liquid crystal resin is molded in-situ at the same time as the parison is extruded, it is easier to improve the physical properties of the molded product as compared with the case where a separate in-situ molded product is compounded. Can be obtained. Further, since this in-situ molding (parison extrusion) is performed at the temperature in the mold window of the thermoplastic matrix resin contained in the molding resin material and the first thermoplastic liquid crystal resin, There is no possibility of causing breakage of the spin-molded fiber made of the plastic liquid crystal resin due to heat.

Further, according to the fourth invention of the present application,
Basically, the same effect as that of the third invention can be obtained. Moreover, since the parison is forcibly pulled down to a predetermined vertical position while being stretched, the second in situ molded second parison is formed.
So-called post-stretching can be added to the thermoplastic liquid crystal resin, and the physical properties of the molded product can be further improved. Further, as a result of preventing the drawdown of the parison, even if the viscosity of the parison becomes too high, the parison can be appropriately hung, and the moldability during blow molding can be secured.

Further, according to the fifth invention of the present application,
Basically, the same effect as that of the above-mentioned fourth invention can be obtained. Moreover, since the parison is pulled down while being rotated about its longitudinal axis, the stretching length when so-called post-stretching is applied to the in-situ molded second thermoplastic liquid crystal resin. Can be made longer to enhance the stretching effect, and at the same time, the strength and rigidity in the circumferential direction of the molded product can be enhanced.

Further, according to the sixth invention of the present application,
Basically, the same effect as that of the third invention can be obtained. Moreover, since the bag-shaped parison is pushed up to the upper and lower positions corresponding to the middle position of the mold surface of the molding die, the parison is blow-molded while being expanded along the mold surface. It can be expanded along its longitudinal axis, whereby so-called post-stretching can be added to the in-situ molded second thermoplastic liquid crystal resin, and the physical properties of the molded product can be further enhanced. . Further, as a result of preventing the drawdown of the parison, even if the viscosity of the parison becomes too high, the parison can be appropriately hung, and the moldability during blow molding can be secured.

Further, according to the seventh invention of the present application,
Basically, the same effect as that of any one of the first to sixth inventions can be obtained. In addition, the fibers formed by the spin-molding of the thermoplastic liquid crystal resin are long fibers, and are made to be composited with the parison substantially along the extrusion direction of the parison, so that the physical properties of the molded article are improved. And the prevention of drawdown can be reliably achieved.

[0026]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. First, a first embodiment of the present invention will be described. FIG. 1 is a cross-sectional explanatory view schematically showing the overall configuration of a blow molding apparatus 1 according to the first embodiment of the present invention. As shown in this figure, the blow molding apparatus 1 is a heat-melted heat source. An accumulator head 2 that extrudes a cylindrical parison 10 using a plastic resin as a base material, a pair of molds 4 that are arranged symmetrically with respect to the longitudinal axis of the parison 10 and that can be brought into contact with and separated from each other, and blow molding The parison 10 is sometimes provided with a blow pin 5 for blowing compressed air, and the blow pin 5 is connected to an elevating cylinder 6 for elevating the blow pin 5. Although not specifically shown, the molds 4, 4 are adapted to be opened and closed by, for example, a hydraulic opening and closing drive device.

A material supply device 11 for supplying a resin material to a ring-shaped cavity 2a in the accumulator head 2 is connected to the lower side surface of the accumulator head 2. Further, a storage portion 3 for storing the resin material supplied into the cavity portion 2a is connected to an upper side surface of the accumulator head 2, and an extrusion cylinder 7 is provided at a terminal side of the storage portion 3. Has been.

In this embodiment, a molding resin material containing a thermoplastic matrix resin and a thermoplastic liquid crystal resin (first liquid crystal resin) having a liquid crystal transition temperature higher than the minimum moldable temperature of the thermoplastic matrix resin are used. The continuous filament-shaped fibers Fr formed by the spin molding are supplied into the cavity 2a in an annular shape from above. The first
The following were used as the liquid crystal resin. (a) First liquid crystal resin-Material name: wholly aromatic polyester resin-Product name: Vectra A950 (polyplastics
Liquid crystal transition temperature: 280 ° C

The material supply device 11 comprises a cylindrical main body 12 (cylinder main body), a screw 13 rotatably housed in the cylinder main body 12, and a motor 15 for driving the screw 13. A hopper 14 for charging the pellets PT1 and PT2 as a molding material into the cylinder body 12 is attached to the rear portion of the cylinder body 12. Although not specifically shown, a heater for heating the inside of the cylinder body 12 to a predetermined temperature is provided on the outer peripheral side of the cylinder body 12.

In this embodiment, the thermoplastic matrix resin and the thermoplastic liquid crystal resin (second liquid crystal resin) having a liquid crystal transition temperature higher than the minimum moldable temperature of the matrix resin are preliminarily prepared in a fibrous state. The formed pellet PT1 of the liquid crystal resin composite and the pellet PT2 made of only the thermoplastic matrix resin are used as molding materials, both pellets PT1 and PT2 are charged from the hopper 14, and the screw 13 is rotated at a predetermined rotation speed. By driving, the matrix resin of each of the pellets PT1 and PT2 is plasticized and melted, and the liquid crystal resin composite in which the second liquid crystal resin is oriented in the fiber state in the matrix resin is in the cavity 2a of the accumulator head 2. And is supplied as a resin material for forming the parison. In the present embodiment, the extrusion temperature at the time of supplying the resin material is more preferably set to the moldable temperature of the matrix resin or higher and the liquid crystal transition temperature of the second liquid crystal resin or higher. Then, so-called in-situ molding is performed in which the second liquid crystal resin is composited in the matrix resin so as to be in a fibrous state.

Further, in this embodiment, as the second liquid crystal resin, one having a liquid crystal transition temperature lower than that of the first liquid crystal resin constituting the fiber formed by the spin molding is used. When preparing the pellets PT1 and PT2, the second
Specific examples of the liquid crystal resin and the thermoplastic matrix resin are as follows. (b) Second liquid crystal resin-Material name: Liquid crystal polyester resin-Product name: Rod Run LC3000 (manufactured by Unitika Ltd.)-Liquid crystal transition temperature: 200 ° C (c) Thermoplastic matrix resin-Material name: Polyethylene resin-Product name : Hi-Z 5500B (Mitsui Petrochemical Industry Co., Ltd.) ・ Minimum moldable temperature: 125 ° C

Blow molding apparatus 1 configured as described above
A molding method performed by using will be described below. In the initial state in which the piston 7a of the extrusion cylinder 7 is maintained in the retracted position, first, as described above, the second liquid crystal resin fiber is filled with the thermoplastic matrix resin in the cavity 2a of the accumulator head 2. An in-situ molded liquid crystal resin composite is supplied. On the other hand, in the cavity 2a, a large number of first liquid crystal resin fibers formed by spin molding are supplied so as to form a ring, and the first and second liquid crystal resin fibers and the matrix resin are combined. A molding resin material is constituted.
Next, when a predetermined amount of this molding resin material is supplied,
The piston 7a of the extrusion cylinder 7 is moved forward, and the molding resin material filled in the cavity 2a is extruded from the annular extrusion port 2b.

In the present embodiment, in the accumulator head 2, at least the portion near the cavity 2a and the extrusion port 2b is at or above the minimum moldable temperature of the matrix resin and the liquid crystal transition of the second thermoplastic liquid crystal resin. By extruding the second liquid crystal resin at a temperature equal to or higher than the temperature and lower than the liquid crystal transition temperature of the first thermoplastic liquid crystal resin, the second liquid crystal resin can be molded in situ during the parison extrusion. On the other hand, for the first liquid crystal resin, mold window molding is performed. At this time, the continuous filament fiber Fr formed by spin molding of the first liquid crystal resin is compounded with the parison 10 substantially along the extrusion direction of the parison 10.

Further, in this embodiment, as shown in FIG.
Parison 10 extruded from accumulator head 2
The pre-pinch device 16 for forcibly pulling down the parison to a predetermined upper and lower position while stretching the
4 is disposed below. The pre-pinch device 16 is
It is composed of a pre-pinch portion 17 that holds the lower part of the parison 10, a support shaft 18 that is fixed to the lower surface side of the pre-pinch portion 17 and that extends in the up-down direction, and a drive portion 19 that moves the support shaft 18 up and down while rotating it. ing. As shown in FIG. 3, the parison 10 extruded from the accumulator head 2 is forced to reach a predetermined vertical position while being stretched by the pre-pinch device 16 and rotated about the longitudinal axis. Be withdrawn.

As described above, the so-called post-stretching is applied to the in-situ molded second liquid crystal resin by forcibly pulling down the parison 10 to a predetermined vertical position while stretching the extruded parison 10. It is possible to further improve the physical properties of the molded product. Further, even if the viscosity of the parison 10 becomes too high as a result of the prevention of drawdown of the parison 10, the parison 10 is
Can be drooped properly, and moldability at the time of blow molding can be secured. In particular, since the parison 10 is pulled down while rotating about the longitudinal axis thereof, the stretching length when applying so-called post-stretching to the in-situ molded second liquid crystal resin is made longer. The stretching effect can be increased,
At the same time, the strength and rigidity of the molded product in the circumferential direction can be increased.

After the parison 10 is pulled down to a predetermined vertical position, as shown in FIG. 4, the molds 4, 4 are closed and the blow pin 5 is projected into the parison 10 as shown in FIG. Blow compressed air from.
By this air blow, the parison 10 becomes a molded product 10 '.
Is pressed and cooled by the die molding surfaces 4a, 4a forming the outer shape. After cooling to a predetermined temperature, the molds 4, 4 are opened and the molded product 10 'is taken out.

As described above, according to this embodiment, the parison 10 is formed by compounding the molding resin material containing the thermoplastic matrix resin and the fiber Fr of the first liquid crystal resin formed by the spin molding. Since the resin is extruded, by blow molding, it is possible to obtain a resin molded product 10 ′ having high physical properties that can be recycled while maintaining strength and rigidity substantially equal to each other by blow molding. Further, by reinforcing the parison with the liquid crystal resin fiber Fr, it is possible to effectively prevent the so-called drawdown phenomenon in which the parison hangs down by its own weight. In this case, since the composite of the matrix resin and the liquid crystal resin fiber Fr formed by the spin molding and the blow molding are carried out at the temperature in the mold window, there is no risk of the liquid crystal fiber Fr being broken by heat.
Further, since the spun molded liquid crystal fibers Fr are combined, a liquid crystal resin molded product having a higher reinforcing effect can be obtained. In particular, the fiber Fr formed by the spin molding of the first liquid crystal resin is a long fiber and is made to be composited with the parison 10 substantially along the extrusion direction of the parison 10, so that the molded product 10 ′ is It is possible to reliably achieve improvement of physical properties and prevention of drawdown.

Since the molding resin material contains the liquid crystal resin fiber formed by the in-situ molding of the second liquid crystal resin fiber in addition to the liquid crystal resin fiber formed by the spin molding, the parison 10 is used. The liquid crystal resin content can be increased, and the physical properties of the molded product can be further improved.

Further, in this case, since the second liquid crystal resin is molded in situ at the same time when the parison is extruded, the molded product 10 'can be more easily formed as compared with the case where a separately molded in-situ product is combined. The effect of improving physical properties can be obtained. Further, since the in-situ molding (parison extrusion) is performed at the temperature inside the mold window of the thermoplastic matrix resin contained in the molding resin material and the first liquid crystal resin, the spinning using the first liquid crystal resin is performed. There is no risk of breaking the molded fiber due to heat.

Further, the fiber formed by the spin molding of the first liquid crystal resin is a long fiber, and is made to be compounded with the parison 10 substantially along the extruding direction of the parison 10. It is possible to surely improve the physical properties of the product 10 'and prevent drawdown.

6 to 8 are views for explaining the second embodiment of the present invention. In the following description, the same components as those in the first embodiment are designated by the same reference numerals, and further description will be omitted. In the blow molding apparatus 31 according to the present embodiment, each mold 34 has a vertically divided structure, and a lower mold 34a that can slide in the mold opening / closing direction with respect to the mold body 34b is provided. . Further, there is provided a pre-pinch device having a pre-pinch portion 37 that holds the lower end of the parison 30 extruded from the accumulator head 2 to form a bag-like shape, and a support shaft 38 that supports the pre-pinch portion 37.

When the parison 30 is formed into a bag shape, first, only the mold bodies 34b, 34b are closed and the mold is clamped, and the blow pin 5 is projected into the parison 30 and compressed air is blown from the blow pin 5. The air blow causes the parison 30 to expand along the molding surfaces 34b, 34b while being pressed against the molding surfaces 34f, 34f (see FIG. 7). Then, when the bag-shaped parison 30 expands by a predetermined amount and is pushed out to a position corresponding to an intermediate position of the molding surfaces 34f, 34f, the lower molds 34a, 34a are closed and compressed air is blown from the blow pin 5 to blow the book. Blow. As a result, the molded product 30 'is molded into the final shape (see FIG. 8).

According to this embodiment, the bag-shaped parison 30 is extruded to the upper and lower positions corresponding to the intermediate positions of the molding surfaces 34f, 34f of the molds 34, 34, and the parison 30 is moved along the molding surfaces 34f, 34f. Since the blow molding is performed while expanding, the parison 30 can be expanded along the longitudinal axis of the parison 30. As a result, the in-situ molded second thermoplastic liquid crystal resin has a so-called rear end. Stretching can be added and molded product 30 '
The physical properties of can be further improved. Further, as a result of the prevention of drawdown of the parison, even if the viscosity of the parison becomes too high, the parison can be appropriately hung, and the moldability at the time of blow molding can be secured.

The present invention is not limited to the above-described embodiments, and within the scope of the gist of the present invention,
It goes without saying that various improvements and design changes are possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an accumulator head and a mold of a blow molding apparatus according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional explanatory diagram showing a pre-pinch process for a parison.

FIG. 3 is an explanatory sectional view showing a set state of the parison.

FIG. 4 is a sectional explanatory view showing an initial step of blow molding.

FIG. 5 is an explanatory cross-sectional view showing a completed state of blow molding.

FIG. 6 is an explanatory sectional view showing the overall structure of a blow molding apparatus according to a second embodiment of the present invention.

FIG. 7 is an explanatory sectional view showing a step of extruding a bag-shaped parison according to the second embodiment.

FIG. 8 is a cross-sectional explanatory view showing a blow molding process according to a second embodiment.

[Explanation of symbols]

 1, 31 ... Blow molding device 2 ... Accumulator head 4, 34 ... Mold 10,30 ... Parison 11 ... Material supply device 16 ... Pre-pinch device Fr ... Spin-cast liquid crystal fiber PT1, PT2 ... Pellets

Claims (7)

[Claims] 1. A molding resin material containing a thermoplastic matrix resin, and a fiber obtained by spin molding of a thermoplastic liquid crystal resin having a liquid crystal transition temperature higher than the minimum moldable temperature of the thermoplastic matrix resin, The thermoplastic matrix resin is extruded as a parison by being compounded at a temperature higher than the minimum moldable temperature of the thermoplastic matrix resin and lower than the liquid crystal transition temperature of the thermoplastic liquid crystal resin, and the parison is the minimum moldable temperature of the thermoplastic matrix resin. A blow molding method for a liquid crystal resin composite, which comprises blow molding at a temperature not lower than a temperature and lower than a liquid crystal transition temperature of the thermoplastic liquid crystal resin. 2. The blow molding of a liquid crystal resin composite according to claim 1, wherein the molding resin material contains a liquid crystal resin composite in which thermoplastic liquid crystal resin fibers are molded in situ. Method. 3. The molding resin material contains a second thermoplastic liquid crystal resin having a liquid crystal transition temperature lower than that of the first thermoplastic liquid crystal resin constituting the fiber formed by the spin molding, and Extruding the parison at a temperature above the minimum moldable temperature of the thermoplastic matrix resin and above the liquid crystal transition temperature of the second thermoplastic liquid crystal resin and below the liquid crystal transition temperature of the first thermoplastic liquid crystal resin. The blow molding method for a liquid crystal resin composite according to claim 1, wherein the second thermoplastic liquid crystal resin is molded in situ during the extrusion of the parison. 4. The method of blow molding a liquid crystal resin composite according to claim 3, wherein the parison is forcibly pulled down to a predetermined vertical position while being stretched. 5. The method for molding a liquid crystal resin composite according to claim 4, wherein the parison is pulled down while being rotated about its longitudinal axis. 6. A blow-shaped parison is extruded to an upper and lower position corresponding to an intermediate position of the mold surface of the molding die, and the parison is blow-molded while being expanded along the mold surface. A method for blow molding a liquid crystal resin composite as described above. 7. The fiber formed by the spin molding of the thermoplastic liquid crystal resin is a long fiber, and is compounded with the parison substantially along the extrusion direction of the parison. Item 7. A blow molding method for a liquid crystal resin composite according to any one of items 6.