JP2001088223A - Apparatus for producing thermoplastic resin long object reinforced by long fibers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a means for preventing the generation of fluff or pill at the time of production of a long fiber reinforced resin long object. SOLUTION: The longitudinal cross-sectional shape of the shaping nozzle 1 bored in the downstream end wall Vd of an opening and impregnation tank V is formed from a conical part 11 and the land 12 having a cylindrical surface continued thereto, the vertical angle (α) of the inner wall surface 11i of the conical part is set to 15-35 deg., the length of the land is set to 1-5 mm, and the thickness of the downstream end wall Vd is set to 5-30 mm. A molten resin is introduced from a supply mechanism (not shown in a drawing) through a resin introducing port Vi. A continuous fiber bundle F is introduced through the fiber bundle introducing port Vuf or Vtf provided to an upstream end wall Vu or the upstream region of a top plate Vt, and impregnated with the resin while opened by the opening construction member RP in a main apparatus V. The impregnated fiber bundle is drawn out of the main apparatus V toward the downstream area by a drawing-out device (not shown in a drawing) while squeezed by the shaping nozzle 1 to obtain a long fiber reinforced resin long object S. Fluff or pill is not almost generated in the periphery of the outlet of the shaping nozzle 1 bored in the opening and impregnation tank V.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous reinforcing fiber bundle impregnated with a molten thermoplastic resin to form a reinforced thermoplastic resin elongated body, that is, a thermoplastic resin reinforced with unidirectionally aligned long fibers. The present invention relates to an apparatus for manufacturing a structure. More specifically, the present invention mainly relates to the use of a shaping nozzle having a specific shape, and relates to an apparatus for producing a thermoplastic resin long body which suppresses generation of pills due to thread breakage and has excellent stable productivity.

[0002]

2. Description of the Related Art Various methods for satisfactorily impregnating reinforcing fiber bundles with a molten resin have already been proposed in Japanese Patent Publication No. 63-37694. According to these methods, it is possible to obtain a thermoplastic resin long body having excellent impregnation properties. However, according to the investigations by the present inventors, it has been found that the following various necessary items for improvement remain: pills are generated due to breakage of the fiber with long running; As a result of the ball clogging the shaping nozzle, further thread breakage occurs, and eventually the entire elongated body breaks, leading to a stoppage of operation.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned various necessary items, and to reduce hair balls which are frequently generated at a shaping nozzle located at the downstream end of a fiber impregnation apparatus even after a long operation. It is an object of the present invention to provide a measure for preventing the occurrence of the above problem and to develop an apparatus capable of stably producing a long thermoplastic resin body reinforced with long fibers for a long time.

[0004]

SUMMARY OF THE INVENTION The present invention can achieve its effects by the embodiments constituted by the combination of the following requirements: 1) A long thermoplastic resin reinforced with long fibers. In a pultrusion molding apparatus for manufacturing a body, an apex angle (α) of an upstream conical surface forming a shaping nozzle formed in a downstream end wall of the molding apparatus is 15 to 35 degrees, and the shaping is performed. A manufacturing apparatus wherein the nozzle has a land portion having a length of 1 to 5 mm in a downstream region thereof. 2) The apex angle (α) of the conical surface on the upstream side of the shaping nozzle is 20 to 3
Item 2. The manufacturing apparatus according to Item 1, wherein the angle is 0 degree. 3) The manufacturing apparatus according to item 1 or 2, wherein the shaping nozzle has a thickness of 5 to 35 mm on a central axis from an upstream end to a downstream end. 4) The manufacturing apparatus according to any one of claims 1 to 3, wherein the shaping nozzle has a thickness of 15 to 30 mm on a central axis from an upstream end to a downstream end.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tank-type opening and impregnating apparatus ("pull-drawing apparatus") for producing a long thermoplastic resin body reinforced with long fibers.
) And more specifically, the shaping nozzle of the present invention mounted thereon will be specifically described below with reference to the drawings. However, the invention is not limited in any way by these specific descriptions.

<Description Based on the Drawings> FIG. 1 is a diagram used for convenience for explaining the present invention and the prior art, and FIG.
Is a diagram for explaining a preferred embodiment (example) of the present invention, and FIGS. 3 and 4 are diagrams for explaining a similar embodiment (comparative example). A preferred embodiment of the present invention, which is summarized in FIG. 1, is a schematic longitudinal cross-section showing an "spreading and impregnating apparatus V (also called a" pultruding apparatus ")" for producing a long thermoplastic resin body reinforced with long fibers. According to FIG. 1 (A), according to FIG. 1 (A), the open fiber impregnating device (V; sometimes abbreviated as “open fiber impregnating tank” or “impregnating tank”) is a long fiber bundle F to be opened. (Long fiber roving) is located on both sides along the traveling direction of the left side wall (not shown) and right side wall (not shown), the upstream end wall located at the upstream end of the tank and forming the impregnation tank V Vu, a downstream end wall Vd located at the downstream end of the tank to form the impregnation tank V, a bottom plate Vb closely contacting all of the both side walls and both end walls with a lower edge surface, and a bottom plate Vb opposed to the bottom plate Vb. It is mainly formed of a top plate Vt which is closely contacted with the entire upper edge surface.

In addition, one or more, preferably three or more, of the impregnating tanks V are installed so as to connect between both side walls inside the impregnating tank V and at a height immersed in the molten resin. Fine roll R (both free rotation and drive rotation are possible) or preferably 3
A pair or more (fixed: non-rotating) spreading pins P (both may be collectively referred to as a "spreading structure RP") and a tapered shaping of the present invention formed in the downstream end wall Vd And a nozzle 1.

[0008] The shaping nozzle 1 of the present invention comprises an opening impregnation tank V
This is a nozzle for shaping the long fiber-reinforced resin long body S formed in the inside into a desired cross-sectional shape when the long body S is drawn out of the tank. Here, the “shaping nozzle” may be referred to as a “shaping orifice”, but in the present invention, this is referred to as a “shaping nozzle”. FIG. 1 (B) is a most upstream side portion showing another embodiment of the opening and impregnating device V equipped with the shaping nozzle 1 of the present invention. In this embodiment, the upstream top plate of the opening and impregnating device V is shown. A long fiber bundle F to be spread obliquely downward from the upper left is introduced through the long fiber bundle introduction port Vtf drilled in the above, and then, after being introduced into the molten resin, a turning means (a turning roll Tr or a turning pin Tp). At the position turned in the substantially horizontal direction while contacting from the lower left side of the sheet, the sheet is separated from the turning means T and heads toward the spread roller R or the spread pin P. This turning means is not intended to open the fiber, but is simply a long fiber bundle F
It is merely a means of changing the moving direction of the object.

<< Embodiment of the Present Invention >> FIG. 2 is a schematic enlarged longitudinal sectional view of the shaping nozzle 1 of the present invention. In FIG. 2, the shaping nozzle 1 is directed to the downstream end wall Vd toward the downstream side. It is formed of a conical portion 11 that is formed by tapering and a land portion 12 that is connected to a downstream end thereof. The wall surface 11i of the shaping nozzle 1 viewed from the upstream side is usually a conical surface surrounding the central axis (X) of the shaping nozzle 1, but may be an elliptical cone surface or the like (the inner wall surface of the land portion is usually Is not visible). Each of the two straight lines 11m converging toward the downstream side on the longitudinal sectional view of the downstream end wall Vd shown in each figure including FIG. 2 is a generatrix located on the inner wall surface 11i of the conical portion.

In the shaping nozzle 1 of the present invention, the conical portion 1
The apex angle [α: intersection angle of the two straight lines 11i] of the conical surface formed by the inner wall surface 11i is usually 15 to 35 degrees, preferably 20 to 35 degrees.
A setting of 30 degrees is sufficient in most cases. The downstream end of the conical portion 11 is connected to a land portion 12, and the land portion 12 is usually formed of a cylindrical surface. The length of the land portion 12 (land length) is usually 1 to 5 mm, preferably 1
It is sufficient in most cases if it is set to ~ 3 mm.

In the present invention, the shaping nozzle 1 of the present invention is used.
The thickness of the downstream end wall Vd in which is formed is also important, and it is preferable that this thickness is usually set to 5 to 35 mm, preferably 10 to 30 mm. <Explanation of Operation of Spreading and Impregnating Apparatus V> The opening and impregnating apparatus V of FIG. 1 (also referred to as a “pultruding apparatus”; “impregnation tank”) in which the shaping nozzle 1 of the present invention shown in FIG. In the drawing), the long fiber introduction nozzle Vuf perforated on the upstream end wall Vu displayed on the left side of the drawing (“up, down, left, right, front, back, and vertical” is an expression for convenience of explanation) or in the drawing. The long fiber roving F is introduced into the opening and impregnating device V through any of the long fiber introduction ports Vtf provided in the upstream region of the top plate Vt located at the upper left. On the other hand, inside the apparatus V, a molten resin is introduced from a molten resin supply mechanism (not shown) connected to a molten resin introduction port Vi which is usually formed in the bottom plate Vb via the introduction port Vi, and a predetermined amount of molten resin is introduced. The liquid level of the molten resin is maintained at the height of the molten resin.

<< Molten Resin Inlet Vi >> The molten resin is supplied to the opening and impregnating tank V from the molten resin inlet Vi provided in the impregnating tank. This molten resin inlet Vi is usually
The impregnation tank V is provided with at least one of a top plate Vt, a bottom plate Vb, and an upstream end wall Vu. << Spreading fiber bundle inlet Vf >> The opening fiber bundle F (long fiber bundle) is introduced into the spreader impregnation tank V via the long fiber bundle inlet Vf (collectively) as described above. . The long fiber bundle introduction port Vf is selected from the upstream end wall Vu and the top plate Vt of the open fiber impregnation tank V.
Drilled above. The shape of the long fiber bundle introduction port Vf can be appropriately selected according to the place where the long fiber bundle is introduced. For example, a long fiber bundle F (a long fiber bundle) is formed on the upstream end wall Vu. In the case of introduction from the bundle introduction port Vuf, the cross-sectional shape of the long fiber bundle introduction port Vuf is set to a cross-sectional shape of the long fiber bundle F itself or a slit shape adapted to a cross-sectional shape in which a plurality of these are arranged side by side. Is enough.

On the other hand, when the long fiber bundle F is introduced from the long fiber bundle introduction port Vtf opened in the upstream area of the top plate Vt of the impregnation tank V, the shape of the long fiber bundle introduction port Vtf is the same as that of the long fiber bundle. It can be freely selected without being restricted by the cross-sectional shape. That is, since there is no fear that the molten resin leaks from the inlet Vtf, the shape of the long fiber bundle inlet Vtf may be the same as the long fiber inlet Vuf formed in the upstream end wall Vu. Of course, differently, a simple round or square opening may be used.

<< Spreading and impregnating tank and temperature setting thereof >> The above-mentioned "spreading and impregnating tank" V is used to allow the molten resin to flow while storing a predetermined amount thereof and to impregnate the molten resin between the fibers of the spread fiber. In general, a box shape is sufficient.
At a minimum, the left and right side walls VsLR and the bottom plate Vb of the open fiber impregnation tank V
It is important that is equipped with a heating mechanism (not shown). With this heating mechanism, the base resin to be used and the continuous fiber bundle F to be opened and impregnated can be heated and kept at a temperature sufficiently higher than the crystal melting point of the base resin. It is preferred that The above “sufficiently high temperature” is generally 10 to 1 times higher than the crystal melting point of the resin used.
This heating mechanism has the ability to raise and maintain the temperature of the resin and the continuous fiber bundle (F) in the impregnation tank V to the above “sufficiently high temperature”. Preferably it is provided. Here, when the base resin is a combination of two or more thermoplastic resins, the “sufficiently high temperature” is usually 10 to 150 ° C., preferably 30 to 150 ° C., higher than the crystalline melting point of the resin having the highest melting point. A high temperature of only 120 ° C is used.
"Sufficiently high temperature" for the new melting point after descent
It is enough to calculate

Here, the “crystal melting point (Tm)” is defined as the temperature which is generated while increasing the temperature of the sample at a rate of 20 ° C./min in the measurement of heat of fusion using a differential scanning calorimeter (DSC). The temperature at which the peak of heat of fusion occurs in the curve showing the relation of heat of fusion. When a plurality of heats of fusion peaks are observed, the temperature at which the peak occupying the largest area is located is set.

The long fiber roving F introduced from the upstream side into the opening impregnating apparatus V is provided with three or more opening RPs (RP ( Opening by the "spreading roll" and "spreading pin"), and between each spread (one or more selected from a single filament and a low-density bundle thereof) generated by spreading. Is impregnated with the molten resin (spreading impregnation). The opening method in this case is roughly classified into two types.

In the first opening method, an opening roll R is usually used as three or more opening members, and these are rotated.
(Driving or floating), and a long fiber bundle F introduced into the opening and impregnating device V is arranged along the direction of movement of the molten resin. Only the length is a method of performing fiber opening by so-called "staggered contact" that repeats the contacting action.

In the second opening method, usually, three or more pairs of opening pins P (opening pins Pu and lower opening pins Pd are combined) are used as the opening frame, and each pair is made of molten resin. It is installed substantially perpendicularly to the flow direction, and in a form that sandwiches the long fiber bundle F from above and below without contact, and is installed in series from upstream to downstream with a predetermined interval between each pair. In addition, the introduced long fiber bundle F does not contact the upper opening pin Pu and the lower opening pin Pd with either the upper opening pin Pu or the lower opening Pd, that is, a substantially straight line in a so-called “non-contact” state. This is a method in which the fiber is opened while passing through. Here, the opening pin pair is usually 3 mm in a substantially horizontal plane in the direction of travel of the molten resin.
Has been installed.

In the actual opening operation, while the long fiber bundle F is opened by any of the above-described opening methods, in the impregnation operation performed at the same time as or slightly after the opening, molten resin is contained in each opened fiber. After being impregnated, the thermoplastic resin elongated body S (strand or rod) reinforced with long fibers is obtained by being drawn out of the opening and impregnating tank V downstream while being squeezed together with the thermoplastic resin by the shaping nozzle 1. Can be

When the long fiber-reinforced resin elongated body S is pulled out from the shaping nozzle 1, when the conventional shaping nozzle 2 or 3 is used, it is often near the outlet of the downstream end wall Vd. A pill occurs. This pill is a reaction that the filament broken by opening is passed through the shaping nozzle 1 and is strongly squeezed. It is seen as a set of "rear hairs" as a result of being drawn out of the shaped shaping nozzles 2 or 3 and continuing to bend outward when they are released from suppression.

<< Aspects of Comparative Examples 1 and 2 >> FIG. 3 (Comparative Example 1)
, The shaping nozzle 2 has a conical surface 2 viewed from the upstream side.
1 is the same as in the present invention, and the length of the land 22 connected to the downstream side of the shaping nozzle 2 is set to 6 to 10 mm, which is longer than 1 to 5 mm in the present invention. . In the fiber impregnation using the shaping nozzle 2, pills caused by yarn breakage and fluffing from the long fiber-reinforced resin long body S (long fiber-reinforced strand) occurred frequently enough to prevent steady operation.

In FIG. 4 (Comparative Example 2), the length of the land 32 of the shaping nozzle 3 is the same as that of the present invention.
The apex angle (α) of the conical surface 31 as viewed from the upstream side is set to 45 degrees, which is much larger than 15 to 35 degrees in the present invention. In the operation of the opening and impregnating apparatus V equipped with the shaping nozzle 3, neither the yarn breakage nor the fluffing from the introduced long fiber bundle F occurred so violently as to hinder the steady operation, but the frequency of occurrence and The intensity of the phenomenon was enough to reduce the quality of the product.

<< Attachment Equipment >> An example of an apparatus commonly used as a mechanism (not shown) for supplying a molten resin to the above-mentioned impregnating vessel V is an extruder. Among these extruders, various types can be used, for example, any of a single screw type or a twin screw type can be used, and among the twin screw types, the same direction (rotation) type and different directions ( In addition to the two types of (rotation) type, those having an equal length screw and those having an unequal length are used according to the purpose.

Various cooling equipment and / or sizing dies and the like can be installed on the downstream side of the shaping nozzle 1 formed on the downstream end wall Vd of the opening and impregnating tank V. This cooling device is a device for cooling the extruded reinforced strand (rod), and the sizing die is a reinforced resin long body S
(Strengthened strands; reinforced rods) are intended to improve the shape such as roundness. In addition, a pelletizer (granulation mechanism)
And the like, and a long body (usually about 1 to 4 mm in diameter) is shredded (cut) into an average length of 3 to 50 mm (granular body).
Is often performed.

<< Long Fiber Reinforcement F >> Glass fiber, carbon fiber, metal fiber, fused quartz fiber and the like are usually manufactured as a reinforcement for the base resin and are commercially available. And inorganic fibers and organic fibers such as synthetic resin fibers. Each of these long fiber reinforcements F
Those in the form of substantially endless "long fibers" are suitable for the purposes of the present invention. However, the form actually supplied is not a single fiber, but is generally a form “roving” formed by bundling a large number of these fibers and bonding them to each other appropriately. It is expected that this roving can be opened to a stage as close to individual single fibers as possible in the opening process.

It is preferable that the long fiber opened body obtained by the roving through the fiber opening step is dispersed as uniformly as possible in the base material (matrix) resin. In addition, in the case where the long fiber spread body is contained in an elongated object such as a reinforced strand or a reinforced rod S, it is preferable that the long fiber is aligned as parallel as possible to the long axis direction. <Material of long fiber reinforced material> The long fiber reinforced material F used for producing the long fiber reinforced elongated body S of the present invention may be of various materials. The materials are roughly classified into inorganic substances and organic substances. The most practical inorganic materials include, for example, glass (silicate glass), quartz, natural minerals, metals and carbon. Here, “glass” is a solid solution containing a metal silicate as a main component, and includes soda glass, potash glass, borosilicate glass (borosilicate glass; borosilicate glass) which is heat-resistant glass, and the like. Among the various glasses, a preferred glass is a potassium silicate glass
(Potash glass) and borosilicate glass (also known as "E glass").

[0027] Among the materials of the long fiber reinforcement, glass is the most frequently used reinforcement in terms of its tensile properties, bending properties, thermal properties and its price. Is subject to some restrictions. << Glass Fiber Reinforcement FG >> A glass continuous fiber bundle F (glass long fiber bundle) which is usually manufactured as a reinforcement for a base resin and is a representative of commercially available long fiber reinforcements is glass. Roving can be mentioned. This glass roving usually has an average fiber diameter of 4 to 30 μm, a number of filament bundles of 400 to 10,000, and a tex count of 300 to
It is 20,000 g / km, but preferably the average fiber diameter is 9 to 2
3 μm, 1000 to 6000 convergence tubes.
From the viewpoint of the reinforcing effect on the base resin, on the surface of the long fiber reinforcing material, as a treatment agent for imparting or improving interfacial adhesion,
Preferably, a treatment with a silane coupling agent or the like is performed.

<< Organic Fiber Reinforcement FP >> The carbon fiber FC floats on the glass fiber reinforced material FG because of its excellent lightness and alkali resistance. However, since carbon fiber FC is inferior to glass fiber in terms of its price, applications where both lightness and strength (high specific strength) take precedence over price, such as for aircraft and racing It is restricted to vehicles or sports use.

The organic substance is mainly a synthetic resin and can be roughly classified into a thermosetting resin and a thermoplastic resin. Among these, the thermosetting resin does not bring the thermoplastic resin close to the feet due to its high heat resistance to the long fiber for the reinforcing material F, but cannot be compared with the thermoplastic resin in terms of its moldability.
Among these thermoplastic resins, those having high crystallinity and high melting point are excellent for long fiber reinforcement. When a thermoplastic resin is used as the reinforcing material FP, the melting point of the thermoplastic resin must be significantly higher than the melting point of the base resin.
It is desired that the temperature is 0 ° C. or higher, preferably 70 ° C. or higher.

As a thermoplastic resin having a high crystallinity and a high melting point, for example, various polyamide resins or polyester resins are suitable for applications where high heat resistance, for example, a melting point exceeding 200 ° C. is desired. Here, as the polyamide resin, ring-opening addition polymerization type nylon such as 6-nylon, 7-nylon,
11-nylon and 12-nylon can be mentioned, and the copolycondensation type polyamide resin is 6,6-nylon, 6,7-nylon, 6,10-nylon, 6,12-nylon and the like and 6- / 6 General-purpose brands and special brands such as 1,6-co-condensed nylon.

When higher heat resistance is desired, an aromatic polyamide resin, a wholly aromatic polyamide resin (other name: aramid resin) or the like is used. A typical example of the former is a so-called "nylon MXD6", that is, a cocondensation polymer of m-xylylenediamine and adipic acid, and a typical example of the latter is a cocondensation polymer of m-xylylenediamine and terephthalic acid. Is exemplified. Some of the latter belong to the market.

The most common polyester (resin) is a co-condensation polymer of an aliphatic diol and an aromatic dicarboxylic acid, especially ethylene glycol (or "ethylene oxide; ethylene oxide"). And a terephthalic acid (“polyethylene terephthalate”; abbreviation “PET”). As a polyester having a higher heat resistance than this, a co-condensation polymer using 1,4-butanediol instead of ethylene glycol as an aliphatic diol (`` poly-1,4-butanediol terephthalate ''; abbreviation) "PBT"). As a polyester resin having particularly excellent heat resistance, there is a so-called "whole aromatic polyester" in which the diol side is also an aromatic compound, and some of them are used as materials for bulletproof vests.

<Substrate (Substrate; Matrix) Resin> Material resin of molten resin to be impregnated between the spread bodies (single filaments or low-degree spread articles) obtained by spreading the long fiber bundle (roving) Is usually 110 to 350 ° C., preferably 150 ° C.
Any one of thermoplastic resins having a temperature of up to 270 ° C. may be used. However, in ordinary applications, a crystalline resin such as a polyolefin-based resin, a polyamide-based resin (nylon) and a polyester-based resin, or a resin composition comprising a combination of two or more of these materials is used as a material resin. It is common to use as When two or more kinds of thermoplastic resins are used in combination, it is preferable that the combination is such that sufficient compatibility between the resins is realized.

Among the above-mentioned crystalline thermoplastic resins, polyolefin-based resins PO are frequently used for ordinary applications from the viewpoint of properties and price. The polyolefin-based resin PO is a composition of a crystalline homopolymer or a crystalline copolymer having two or more α-olefins having usually about 2 to 10 carbon atoms as a constitutional unit, or a composition of two or more crystalline homopolymers ( A concept that includes a composition (mixture) of two or more crystalline copolymers (mixture) or a composition (mixture) of one or more crystalline homopolymers and one or more crystalline copolymers It is.

The α-olefin having 2 to 10 carbon atoms constituting the crystalline polyolefin resin is, for example, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene. , 1-octene, 1-decene, etc., and not limited to one type, but may be a combination of two or more types. Crystalline polyolefin (“poly-α-olefin”
Among them, the crystalline polypropylene resin PP is the most versatile practically. It should be noted that a polyethylene resin PE is suitable for low-temperature use, and a poly-4-methyl-1-pentene resin MPT is suitable for use in which high-temperature use is desired. If necessary, two or more of the above-mentioned crystalline polyolefin-based resins are appropriately selected and combined to obtain a resin in a form of a composition that exhibits properties that are difficult to realize with any one of the resins alone. Can be.

The base resin constituting the thermoplastic resin long body S of the present invention reinforced with long fibers F has a melt flow rate [MFR (230 ° C .; 21.2N)] of 30 to 300 g / 10 min, preferably 50 Any thermoplastic resin of up to 200 g / 10 min can be used. Further, for applications requiring even higher heat resistance, the above-mentioned polyamide resin NL (nylon) or thermoplastic polyester resin as a base resin, and a thermosetting resin or inorganic material fiber as long fiber reinforcing material F, for example. It is preferable to use at least one selected from glass fiber FG (silicate glass fiber), rock wool fiber, quartz fiber, carbon fiber FC and metal fiber.

<Material and Surface Finish of Shaping Nozzle 1 (Shaping Dice)> The shaping nozzle 1 of the present invention has the apex angle (α) of the conical surface 11 and the inner diameter and wall surface of the land portion 12 as viewed from the upstream side. Are worn due to long-term friction with high-hardness fibers such as glass fibers F. To suppress this wear, the shaping nozzle 1
Material is selected from high wear-resistant iron-tungsten alloy (trade name: Tungaloy) or ultra-hard alloy such as iron-titanium (ferro-titanium) alloy, and the surface has excellent surface hardness such as chromium or nickel It is preferable to perform a plating treatment (metal plating treatment), preferably an electrolytic plating (electroplating) treatment with a metal for forming a coated film to further smooth the surface. When a higher surface hardness and surface smoothness are required for the shaping nozzle 1, the surface of the shaping nozzle made of the above-mentioned ultra-hard alloy or the like is not subjected to the metal plating treatment, but the surface of the shaping nozzle is advanced by electrolytic polishing or the like. Preferably, it is smoothed.

[0038]

According to the present invention, the downstream end wall carrying the shaping nozzle of a specific shape according to the present invention is mounted on the opening impregnation tank, and the length of the land formed on the downstream end wall is also in accordance with the present invention. If the setting (selection) is made, there is an effect that breakage and fluffing of the long fiber at the time of opening the fiber and hair balls caused by the breakage are less likely to occur. As a result, the fiber opening impregnation device equipped with the downstream end wall carrying the shaping nozzle (including the land portion) of the present invention stably withstands continuous operation for a long period of time.

[Brief description of the drawings]

FIG. 1A is a schematic longitudinal sectional view of an opening and impregnating apparatus having a downstream end wall having a shaping nozzle according to the present invention as a component, and FIG. 1B is an upstream side. It is a typical fragmentary enlarged longitudinal cross-sectional view which shows only the part provided with the long fiber bundle introduction port in the top plate.

FIG. 2 is a schematic enlarged longitudinal sectional view of the shaping nozzle of the present invention.

FIG. 3 is a schematic longitudinal sectional view of a shaping nozzle corresponding to Comparative Example 1, in which a land portion of the nozzle is set to be considerably longer than in the present invention.

FIG. 4 is a schematic longitudinal sectional view of a shaping nozzle corresponding to Comparative Example 2, in which the apex angle of a conical surface in this nozzle is set to be much larger than in the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 shaping nozzle of the present invention 2 shaping nozzle of a comparative example 3 shaping nozzle of a comparative example 11 conical surface of shaping nozzle of the present invention 21 conical surface of shaping nozzle of comparative example 1 31 shaping nozzle of comparative example 2 12 Land portion in the shaping nozzle of the present invention 22 Land portion in the shaping nozzle of Comparative Example 1 32 Land portion in the shaping nozzle of Comparative Example 11 11 m Bus bar located on the inner wall surface of the conical portion F Long fiber roving P Spreading Pin (generic name) R Spreading roll (generic name) S Long resin body reinforced with long fiber T Turning means of long fiber bundle (generic name) V Entire opening and impregnating device X Central axis of shaping nozzle FC Carbon long fiber reinforced Material FG Glass long fiber reinforcement FP Synthetic resin long fiber reinforcement Pu Upper spreading pin Pd Lower spreading pin RP Spreading erection body (general name) Tp Turning pin Tr Turning roll Vb Bottom plate constituting opening impregnating device Vd Open Downstream end wall of impregnating device Vf Inlet for continuous fiber bundle (continuous fiber bundle; long fiber roving) VsL Side wall of opening and impregnating tank VsL Left side wall of opening and impregnating tank VsR Right side wall of opening and impregnating tank Top plate constituting the Vt opening and impregnating device Vu Upstream end wall constituting the Vu opening and impregnating device Vuf Inlet for long fiber bundle perforated on the upstream end wall Vtf Inlet

Claims (4)

[Claims] 1. A pultrusion device for producing a long thermoplastic resin body reinforced with long fibers, wherein a top of an upstream conical surface forming a shaping nozzle formed in a downstream end wall of the device. A manufacturing apparatus characterized in that the angle (α) is 15 to 35 degrees and the shaping nozzle has a land portion having a length of 1 to 5 mm in a downstream region following the upstream conical surface. 2. An apex angle (α) of an upstream conical surface of the shaping nozzle.
The manufacturing apparatus according to claim 1, wherein the angle is 20 to 30 degrees. 3. The manufacturing apparatus according to claim 1, wherein the shaping nozzle has a thickness of 5 to 35 mm on a central axis from an upstream end to a downstream end. 4. The manufacturing apparatus according to claim 1, wherein said shaping nozzle has a thickness of 15 to 30 mm on a central axis from an upstream end to a downstream end.