JPH06114830A - Manufacture of continuous glass-fiber reinforced thermoplastic resin pellet - Google Patents

Abstract

PURPOSE:To provide a method of manufacturing a continuous glass-fiber reinforced thermoplastic rein pellet, which contains continuous glass fibers as reinforcing material and can be manufactured with a high productivity, and wherein glass fibers are impregnated with thermoplastic resin uniformly. CONSTITUTION:Many pieces of monofilaments 6, each having the diameters of 6-25mum, are drawn out of a bushing 1. A converging agent is applied on the monofilament 6 with an applicator 2. The monofilament 6 is divided into a plurality of pieces with a splitter 3 and converged. Traverse is performed with a spiral wire. The thread is wound in a drum shape, and a wound body (cake) 9 is formed. A plurality of glass fiber strands, which are drawn from cake 9, are introduced into a resin impregnating metal mold at the same time. The glass fibers are impregnated with thermoplastic resin, and a pellet is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing continuous glass fiber reinforced thermoplastic resin pellets which is a molding material for FRTP (fiber reinforced thermoplastic resin).

[0002]

2. Description of the Related Art FRTP is a method in which after injection molding, pellets having a prescribed content of the reinforcing material are adjusted, or pellets containing no thermoplastic resin reinforcing material and pellets containing reinforcing material are used. Is injected at a predetermined ratio and injected into an injection molding die to solidify. FRTP
As a reinforcing material for chop strands, glass fiber strands drawn from direct roving are often used.

When the chopped strands are used as a reinforcing material, the chopped strands having a length of about 3 to 6 mm and the thermoplastic resin are heated and kneaded by an extrusion screw to be extruded, cut into a predetermined length and pelletized. . For example, as shown in FIG. 8A, the pellet has a structure in which chopped strands 12 are dispersed and contained in a thermoplastic resin 11.

When the glass fiber strand drawn out from direct roving is used as a reinforcing material, the glass fiber strand is continuously supplied to the die of the extruder and the molten thermoplastic resin is supplied to the die. The thermoplastic resin is impregnated into the strand at the part and extruded,
It is used after being pelletized by cutting it into a predetermined length. In this pellet, for example, as shown in FIG. 8B, a glass fiber strand 7 drawn out from a roving is embedded in a thermoplastic resin 11, and the thermoplastic resin 11 is impregnated between monofilaments 6 of the strand 7. It has a structured structure.

As a method of impregnating such continuous fibers with a thermoplastic resin, for example, JP-A-59-49913 is known.
No. 5, Japanese Patent Publication No. 52-10140, USP 4,439, 3
No. 87 is disclosed.

[0006]

However, the FRTP using the chopped strand as a reinforcing material has the following problems. That is, when the chopped strands and the thermoplastic resin are heated and kneaded by the extruder, the chopped strands are cut due to friction between the extrusion screw and the chopped strands. Furthermore, F
When the RTP is molded, cutting occurs due to friction with the screw of the injection molding machine, so that the glass fiber is further cut, and the fiber length initially 3 to 6 mm is finally 0.05 to 0. It will be about 8 mm. For this reason,
It was not possible to sufficiently improve the mechanical properties of the molded product, especially the impact strength.

Further, FRTP using glass fiber strands drawn out from direct roving as a reinforcing material also has the following problems.

FIG. 7 (a) is a front view showing a direct roving manufacturing apparatus, and FIG. 7 (b) is a side view of the manufacturing apparatus. The direct roving 4 draws out a large number of monofilaments 6 from the bushing 1, applies a sizing agent to the monofilaments 6 with the applicator 2, and bundles the monofilaments 6 with a sizing member 3 to obtain glass fiber strands 7. 7 is shown in FIG.
(B) It is manufactured by winding while traversing by the guide member 5 that reciprocates as shown by the middle arrow, and then heating and drying. As a result, the direct roving 4 forms a wound body in which the glass fiber strands 7 are wound in a substantially cylindrical shape, as shown in FIG.

However, in this direct roving 4, the monofilament in the strand 7 is cut by the friction between the guide member 5 and the glass fiber strand 7, and so-called single yarn breakage easily occurs. For this reason, when manufacturing continuous glass fiber reinforced thermoplastic resin pellets, broken glass monofilaments accumulate in the mold for impregnating the glass fiber strands 7 with the thermoplastic resin and become fluff, which results in tensile resistance of the strands 7. Was more likely to cause the disconnection, which hindered smooth continuous production.

Further, in the production of the direct roving 4, there is a phenomenon in which the sizing agent accumulates on the surface of the winding body due to the movement of water in the natural drying after winding the glass fiber or in the heat drying step, so-called migration. Occur. In this case, the strands 7 on the outer peripheral portion of the roving 4 can be discarded without being used, but the strands 7 exposed on both end faces of the roving 4 must be used. For this reason, when the strand 7 is pulled out from the roving 4 and used, a portion where the sizing agent is accumulated at a high concentration due to migration appears in places. As described above, the glass fiber strand 7 drawn out from the direct roving 4 has a portion in which the sizing agent is accumulated in a high concentration, and the number of monofilament bundles is usually 2
Since it is 000 or more, as shown in FIG. 8B, the thermoplastic resin 11 hardly penetrates into the inside A of the strand 7, and the monofilament 6 is uniformly impregnated with the thermoplastic resin 11. It was difficult to do.

If the impregnation of the thermoplastic resin 11 is not good as described above, the mechanical properties of FRTP may be deteriorated. On the other hand, in order to prevent poor impregnation of the thermoplastic resin 11, it is necessary to slowly pass the glass fiber strands 7 through a die and bring them into contact with the thermoplastic resin 11 over time, which significantly reduces the production speed, There is a problem that the cost becomes high.

In addition to the above, there are the following manufacturing problems. That is, after the roving at the beginning of the production has been used up, or when the strands of the roving have been cut, in order to continue production, it is necessary to connect the strands. At that time, the total number of filaments in the part where the strands are connected is doubled, and in the case of the conventional strand composed of 2000 or more filaments, the impregnation of the resin is significantly deteriorated in the part where the thread is connected, and However, there is a problem in that the resistance at the point is increased and strand breakage or the like is likely to occur.

Therefore, an object of the present invention is to provide a continuous glass containing continuous glass fibers as a reinforcing material, in which the thermoplastic resin is uniformly impregnated into the gaps between individual monofilaments, and which can be manufactured with high productivity. It is to provide a method for producing fiber-reinforced thermoplastic resin pellets.

[0014]

In order to achieve the above-mentioned object, a method for producing a thermoplastic resin pellet of the present invention is to draw a plurality of continuous glass fibers from a glass fiber winding body to obtain a resin impregnating mold. A step of introducing at the same time, a step of feeding a molten thermoplastic resin into the resin impregnating mold, impregnating the continuous glass fiber, and a continuous glass fiber impregnated with the thermoplastic resin from the resin impregnating mold. In the method for producing continuous glass fiber reinforced thermoplastic resin pellets, comprising the step of pulling out and cooling and curing the thermoplastic resin, and the step of cutting the obtained linear molded product into a predetermined length, As a glass melting furnace from 6 ~
A large number of 25 μm-diameter monofilaments are drawn out, divided into a plurality of glass fiber strands by a splitter and bundled, and the plurality of glass fiber strands are arranged in parallel and wound in a drum shape while traversing with a spiral wire. It is characterized by using a plurality of glass fiber strands drawn from the body.

The present invention will be described in more detail below with reference to preferred specific examples. The thermoplastic resin used in the continuous glass fiber reinforced thermoplastic resin pellets of the present invention (hereinafter abbreviated as L-FTP pellets) is not particularly limited, and examples thereof include polyethylene, polypropylene, nylon, polyethylene terephthalate, polybutylene terephthalate, Polystyrene, AS (acrylonitrile styrene) resin, ABS (acrylonitrile butadiene styrene) resin, PPS (polyphenylene sulfide), PEI (polyether imide), PEEK (polyether ether ketone) and the like are preferably used. This thermoplastic resin can appropriately contain known additives such as a colorant, an improving agent, a filler other than glass fiber, etc., depending on the use and molding conditions, and these are kneaded and used according to a conventional method. .

In the present invention, as the continuous glass fiber, a large number of monofilaments having a diameter of 6 to 25 μm are drawn out from a glass melting (spinning) furnace, divided into a plurality of glass fiber strands by a splitter, and bundled. A plurality of glass fiber strands drawn from a wound body obtained by winding fiber strands in a drum shape while traversing with a spiral wire are used. This roll is a so-called cake, but the point different from a normal cake is that a plurality of glass fiber strands are wound in parallel, and therefore, one cake is used. From this, a plurality of glass fiber strands are simultaneously drawn. In the present invention, one or more rolls (cake) are used, and a plurality of glass fiber strands are drawn from the rolls and simultaneously introduced into a resin impregnating mold, impregnated with a thermoplastic resin to form pellets. To manufacture.

In the above, the monofilament diameter is 6 μm.
When it is less than m, the productivity of glass fiber is low and the cost is high, which is not practical. Also, the monofilament diameter is 25μ
When it exceeds m, the rigidity of the monofilament increases and becomes brittle. Therefore, the monofilament is cut by friction between the mold and the glass fiber when passing through the resin impregnating mold of the L-FTP manufacturing apparatus, or by friction between glass fibers. It becomes easy, and fluff is generated in the manufacturing apparatus, and the productivity is likely to be adversely affected.

The wound body (cake) of the glass fiber strands can be manufactured by the apparatus shown in FIGS. 1 (a) and 1 (b), for example. Note that FIG. 1A is a front view of the same device, and FIG. 1B is a side view. That is, a large number of monofilaments 6 are pulled out from the bushing 1, a focusing material is applied to the monofilaments 6 by an applicator 2, the monofilaments 6 are divided into a plurality of glass fiber strands 7 by a splitter 3, and the plurality of glass fibers are bundled. It can be manufactured by winding the strand 7 while traversing it with the spiral wire 8.

Here, as the splitter 3, for example, a comb tooth-shaped one as shown in FIG. 2 is used, and in this example, a predetermined number of monofilaments 6 are introduced into the three grooves 3a, 3b, 3c and bundled. It has a structure that Further, the spiral wire 8 is composed of two wires 8 attached to the rotary shaft 10, as shown in FIGS. 3 (a) and 3 (b).
The wires 8a and 8b are provided with a and 8b, and each wire 8a and 8b has a rotationally symmetrical shape bent in an arc shape. And the rotating shaft 1
0 rotates as shown by the arrow in FIG. 3B, and a plurality of strands 7, here three strands 7, are alternately guided by the wires 8a and 8b to perform a traverse operation.

The wound body (cake) 9 thus obtained is
As shown in FIG. 5 (b), the strand 7 has a drum-like shape, that is, a shape in which the central portion is swollen and both ends are narrowed. Therefore, in the natural drying after winding the glass fiber or in the heating and drying process, even if a phenomenon in which the sizing agent moves to the surface layer along with water and accumulates (migration), the winding start portion on the innermost side of the cake,
By removing the end of the roll on the outermost side of the cake, it is possible to avoid using the poor quality portion where the sizing agent has accumulated. In addition, in this winding body 9, three glass fiber strands 7 are simultaneously drawn out from the inner peripheral side.

Further, while maintaining good impregnation of the thermoplastic resin into the glass fiber strand during the production of L-FTP,
In order to maintain the production speed above a certain level, it is necessary to set the number of bundles per glass fiber strand to about 1200 or less. However, as in the present invention, the number of glass fibers pulled out from the bushing should be plural. If the number of filaments of the glass fiber spun as the whole bushing exceeds 1200, the number of filaments per one glass fiber strand after splitting and focusing is 1200 if the number of filaments of the glass fiber spun as the whole bushing exceeds 1200. This can be less than or equal to this, and by using a large bushing, L
-It also becomes possible to reduce the production cost of glass fiber for FTP.

In this case, the number of strands split by the splitter and bundled is preferably 2 to 8 per cake, and more preferably 2 to 4 per cake. This is because if the number of split yarns is too large, it is easy for adjacent strands to stick to each other when the yarn is split by a splitter and then traversed by a spiral wire.To prevent this, the spacing between split strands should be increased. This is because the difference in the stroke length from the bushing becomes large depending on the strands when they are wound, and the substantial lengths of the strands differ from each other, which adversely affects the L-FTP manufacturing workability.

As described above, the number of monofilaments 6 bundled per glass fiber strand 7 is preferably 1200 or less. This is because when the number of bundles exceeds 1200, it takes time for the resin to permeate into the inside of the glass fiber strand, and the impregnation of the resin tends to be poor. This is because it is necessary to keep the contact time with the resin in the mold for a long time, and the productivity is significantly reduced. Further, a long impregnating mold is required, the resin heating time is prolonged, and thermal deterioration of the resin is likely to be induced, and the appearance (particularly color tone) of the final molded product is likely to be adversely affected. The number of monofilaments 6 bundled per glass fiber strand 7 is more preferably 100 to 1000, and most preferably 200 to 800.

In the present invention, the number of the above-mentioned glass fiber rolls used for producing one pellet may be appropriately selected according to the size of the impregnating mold, more specifically, the diameter of the pellet. Is preferably 4 to 40, and 7 to
35 is more preferable. If the number of glass fiber winding bodies is less than 4, the number of strands contained in one pellet will be small, and the pellets will have a small diameter in relation to the mixing ratio with the resin, resulting in a decrease in production efficiency. When the number of bodies exceeds 40, the number of strands contained in one pellet becomes too large, and the impregnation property of the resin into the strand becomes insufficient.

Further, the content of the continuous glass fiber in the L-FTP pellets is preferably 30 to 85 wt%, and more preferably 40 to 70 wt%. If the content of continuous glass fibers is less than 30 wt%, F
If the content of glass as a master pellet used for RTP molding is insufficient and exceeds 85 wt%, the amount of resin with respect to the amount of glass fiber is too small, and impregnation into glass fiber tends to be insufficient.

The L-FTP of the present invention is described in the above-mentioned Japanese Patent Laid-Open No.
9-49913, Japanese Patent Publication No. 52-10140, USP
It can be manufactured using the manufacturing apparatus disclosed in No. 4,439,387 or the like, and for example, the manufacturing apparatus shown in FIG. 4 is used. In FIG. 4, a plurality of glass fiber strands 7 drawn out from one or a plurality of glass fiber winding bodies (cake) 9 are passed through a preheating furnace 24 and simultaneously introduced into a resin impregnation mold 21. Although the number of the glass fiber winding bodies 9 is two for convenience in FIG. 4, it is actually 4 to 40, and more preferably 7 to 3 as described above.
Use 5 pieces. A plurality of glass fiber strands 7 that have been kneaded and melted by the extruder 25 are fed into the resin impregnation die 21 and aligned, and the glass fiber strands 7 are aligned with each other.
1 is impregnated with a thermoplastic resin. The linear molding 28 thus obtained passes through the cooling tank 26 and the take-up machine 27.
The pellet 30 of the present invention is obtained by pulling it out and cutting it to a predetermined length by a pelletizer 29. In addition,
The cutting length of the pellet 30 is not particularly limited, but usually 0.3 to 3 cm is suitable.

The L-FTP pellet 30 of the present invention is shown in FIG.
As shown in FIG. 2, a plurality of glass fiber strands 7 are aligned along the longitudinal direction, covered with a thermoplastic resin 11 and integrated, and the thermoplastic resin 11 is used to The monofilament 6 is uniformly impregnated to the gap. As the glass fiber strands 7, the monofilaments 6 are bundled and wound in a drum shape while traversing with the spiral wire 8.
The strand 7 has a relatively flat shape by using the one drawn out from the wound body (cake) 9 formed by heating and drying, and the shape of the glass fiber strand 7 in the cross section of the L-FTP pellet also. , Has a flatter shape than the conventional one. This L-FTP pellet 30 is
It is blended with a pellet containing only a thermoplastic resin containing no reinforcing material at an appropriate ratio, and is charged into an injection molding machine to obtain a FRTP molded product.

[0028]

In the present invention, as continuous glass fibers, a large number of monofilaments having a diameter of 6 to 25 μm are drawn out from a glass melting (spinning) furnace, divided into a plurality of glass fiber strands by a splitter, and bundled. Using multiple glass fiber strands drawn from a winding body (cake) that is wound in a drum shape while traversing with a spiral wire and arranging the strands in parallel, less single yarn breakage than direct roving, It is possible to prevent the occurrence of fluff due to the breakage of a single yarn in the mold and the breakage of the strand.

Further, since the above-mentioned wound body (cake) is wound in a drum shape, by removing the winding start portion on the innermost side of the cake and the winding end portion on the outermost side of the cake, the sizing agent is migrated. The L-FTP pellets can be produced without using the accumulated portion of. Moreover, the strands pulled out from the cake come into contact with the spiral wire and have a relatively flat shape. For this reason, the resin impregnating property to the strand is favorably maintained.

Further, if the number of monofilaments bundled per strand is 1200 or less, the resin impregnation property can be further improved, but the wound body (cake) used in the production method of the present invention. Since a large number of monofilaments spun from the bushing are split and wound by a splitter, even when the number of filaments spun from the bushing exceeds 1200, such as a bushing for direct roving, By the splitter, the number of filaments bundled per strand can be set to 1200 or less.
This means that even if a large bushing is used in order to increase the productivity of glass fibers and reduce the cost, the number of filaments bundled per strand is reduced and the resin impregnability is improved as described above. Means that you can maintain.

Since the thermoplastic resin is well impregnated into the glass fiber strands in this manner, pellets are obtained in which the glass fiber surface is extremely uniformly wetted by the thermoplastic resin. A molded article obtained by injection molding using these pellets as raw materials has good resin-glass fiber interfacial adhesion and more uniform glass fiber distribution, thereby obtaining good strength and appearance. You can Further, since the thermoplastic resin is easily impregnated inside the glass fiber strand as described above, the production speed of pellets can be sufficiently maintained. Furthermore,
Since continuous glass fiber is used, there is no problem that the glass fiber length becomes short as in the case of using chopped strands, and thereby the mechanical properties of the molded product, especially the impact strength, should be sufficiently improved. You can

[0032]

【Example】

Example 1 A cake obtained by splitting 1600 16 μm diameter monofilaments spun from a bushing having 1600 nozzles into 800 filaments × 2 filaments by a splitter and winding them into a drum shape through a spiral wire. Was manufactured.

From the four cakes thus produced, two glass fiber strands each, a total of 8 pieces of glass fiber strands, were provided from each cake.
L-FTP pellets having a glass content of 70 wt% were manufactured by pulling out a book to form a reinforcing material and using polypropylene as a thermoplastic resin by the method shown in FIG.

The cross section of this L-FTP pellet was observed to evaluate the impregnation state of the thermoplastic resin. Furthermore, this L
-Using the FTP pellets as master pellets, a predetermined amount of polypropylene was added, and an injection molding machine was used to obtain a strength test piece conforming to ASTM having a glass fiber content of 30.9 wt%. Next, using this test piece, bending strength and impact strength were measured by a method in conformity with ASTM. The results are shown in Table 1.
Shown in.

Example 2 2400 13 μm-diameter monofilaments spun from a bushing having 2400 nozzles were split into 800 filaments by a splitter, bundled, and wound in a drum shape via a spiral wire. I made a cake.

From the four cakes produced in this way, three glass fiber strands, three from each cake, totaling 12 in total.
L-FTP pellets with a glass content of 70 wt% were manufactured in the same manner as in Example 1 except that this was pulled out and used as a reinforcing material.

The cross section of this L-FTP pellet was observed to evaluate the impregnation state of the thermoplastic resin. Furthermore, as in Example 1, A having a glass fiber content of 30.2 wt% was used.
A strength test piece conforming to STM was prepared, and the bending strength and impact strength were measured using this. The results are shown in Table 1.

Example 3 2000 pieces of 9 μm diameter monofilaments spun from a bushing having 2000 nozzles were split into 1000 pieces × 2 pieces by a splitter, bundled, and wound in a drum shape through a spiral wire. I made a cake.

From the eight cakes thus produced, two glass fiber strands each, two from each cake, totaling 16
L-FTP pellets with a glass content of 70 wt% were manufactured in the same manner as in Example 1 except that the book was pulled out and used as a reinforcing material.

The cross section of this L-FTP pellet was observed to evaluate the impregnation state of the thermoplastic resin. Further, in the same manner as in Example 1, A having a glass fiber content of 30.5 wt% was used.
A strength test piece conforming to STM was prepared, and the bending strength and impact strength were measured using this. The results are shown in Table 1.

Example 4 1600 16-μm diameter monofilaments spun from a bushing having 1600 nozzles were split into 800 filaments by a splitter, bundled, and wound in a drum shape via a spiral wire. I made a cake.

From the four cakes thus produced, two glass fiber strands each, a total of 8 pieces of glass fiber strands, are provided from each cake.
L-FTP pellets having a glass content of 66 wt% were manufactured in the same manner as in Example 1 except that a book was pulled out to serve as a reinforcing material and nylon 66 was used as the thermoplastic resin.

The cross section of the L-FTP pellet was observed to evaluate the impregnation state of the thermoplastic resin. Further, in the same manner as in Example 1, A having a glass fiber content of 30.5 wt% was used.
A strength test piece conforming to STM was prepared, and the bending strength and impact strength were measured using this. The results are shown in Table 1.

Comparative Example 1 As a reinforcing material, the monofilament diameter is 13 μm, the number of monofilament bundles is 1000, and the strand cutting length is 3 mm.
Pellets of the thermoplastic resin composition having a glass fiber content of 50 wt% were produced with an extruder using polypropylene as the thermoplastic resin and the chopped strands (CS) of Example 1.

The cross section of the pellet was observed to evaluate the impregnation state of the thermoplastic resin. Further, using this pellet, a strength test piece conforming to ASTM with a glass fiber content of 30.1 wt% was made by an injection molding machine in the same manner as in Example 1, and the bending strength and impact strength were used. Was measured. The results are shown in Table 1.

Comparative Example 2 As a reinforcing material, three glass fiber strands made of direct roving having a monofilament diameter of 16 μm and a monofilament converging number of 2000 were used, and polypropylene was used as a thermoplastic resin. L-FTP pellets having a fiber content of 70 wt% were manufactured.

The cross section of this L-FTP pellet was observed to evaluate the impregnation state of the thermoplastic resin. Furthermore, this L
-Example 1 using FTP pellets as master pellets
AS with glass fiber content of 30.3 wt%
A strength test piece conforming to TM was prepared, and the bending strength and impact strength were measured using this. The results are shown in Table 1.

Comparative Example 3 As the reinforcing material, three glass fiber strands made of direct roving having a monofilament diameter of 16 μm and a monofilament converging number of 2000 were used, and nylon 66 was used as the thermoplastic resin in the same manner as in Example 1.
L-FTP pellets having a glass fiber content of 66 wt% were manufactured.

The cross section of this L-FTP pellet was observed to evaluate the impregnation state of the thermoplastic resin. Furthermore, this L
-FTP pellet pellet as a master pellet,
As in Example 1, AS with a glass content of 30.4%
A strength test piece conforming to TM was prepared, and the bending strength and impact strength were measured using this. The results are shown in Table 1.

In Table 1, "continuous" means a continuous glass fiber strand and "CS" means a chopped strand. In addition, “productivity” is the L-FT of Comparative Example 2.
The relative value when the productivity of P pellets per hour is 100 is shown.

[0051]

[Table 1]

From the results shown in Table 1, in Examples 1 to 4 in which the glass fiber strands drawn from the cake were used, the impregnability of the thermoplastic resin into the strands was good, and the bending strength and impact strength of the molded product were also high. It turns out to be excellent. In addition, there is no strand breakage due to fluff clogging, and L
-It can be seen that the productivity of FTP pellets is also high.

On the other hand, in Comparative Example 1 using chopped strands, it can be seen that the bending strength and impact strength of the molded product are low, although the impregnation property of the thermoplastic resin into the strands is good.

Further, in Comparative Examples 2 and 3 using glass fiber strands drawn out from direct roving,
Insufficient impregnation of the thermoplastic resin into the strand,
It can be seen that the bending strength and impact strength of the molded product are inferior when compared with the product of the example in which the diameter and the total number of monofilaments and the kind of the thermoplastic resin are the same. Furthermore, Comparative Examples 2 and 3
Then, there was strand breakage due to fluff clogging, and LF
The productivity of TP pellets was also low.

[0055]

As described above, according to the present invention,
Multiple monofilaments spun from the bushing are split by a splitter, bundled, and then wound around a drum while traversing with a spiral wire. Since it is used as a reinforcing material, even when the number of filaments spun from the bushing exceeds 1200, for example, the number of filaments bundled per strand can be set to 1200 or less by the splitter. This means that the productivity of glass fibers can be increased by using a large bushing, and the number of filaments bundled per strand can be reduced to maintain good resin impregnation.

In addition, the winding body (cake) wound in a drum shape removes the winding start portion on the innermost side of the cake and the winding end portion on the outermost side of the cake, so that the portion where the sizing agent is accumulated by migration is removed. L-FT without using
P pellets can be manufactured. Moreover, the strands pulled out from the cake come into contact with the spiral wire and have a relatively flat shape. For this reason, the resin impregnating property to the strand is favorably maintained.

Thus, by using the glass fiber strands drawn from the above-mentioned wound body (cake),
L-FTP in which the thermoplastic resin is uniformly impregnated inside the glass fiber strand is obtained, and by using this L-FTP, the resin-glass fiber interface adhesion in the molded article is improved, and the glass fiber distribution is more improved. Since it becomes uniform and the glass fiber length becomes long, a molded product having excellent mechanical properties, particularly excellent impact strength can be obtained. Further, since the glass fibers are parallel to the surface of the molded product, a molded product having a beautiful surface appearance can be obtained.

Further, the glass fiber strands drawn out from the above-mentioned wound body (cake) are less likely to cause strand breakage because the occurrence of fluff due to single yarn breakage is small. Further, since the thermoplastic resin has a good impregnation property, the speed of the production line can be improved as compared with the conventional L-FTP pellet using the glass fiber strand drawn out from direct roving.

[Brief description of drawings]

FIG. 1 shows an apparatus for producing a wound body (cake) of glass fiber strands used for a continuous glass fiber reinforced thermoplastic resin pellet of the present invention, (a) is a front view and (b) is a side view.

FIG. 2 is a plan view of a splitter used in the manufacturing apparatus.

FIG. 3 shows a structure of a spiral wire used in the manufacturing apparatus, (a) is a side view and (b) is a front view.

FIG. 4 is a schematic explanatory view showing an example of an apparatus for producing continuous glass fiber reinforced thermoplastic resin pellets of the present invention.

FIG. 5 shows a direct roving used for a conventional continuous glass fiber reinforced thermoplastic resin pellet and a wound body (cake) of glass fiber strands used for the continuous glass fiber reinforced thermoplastic resin pellet of the present invention. ) Is a perspective view of direct roving, and (b) is a perspective view of a cake.

FIG. 6 is a schematic explanatory view showing one example of continuous glass fiber reinforced thermoplastic resin pellets of the present invention.

FIG. 7 shows a conventional direct roving manufacturing apparatus used for continuous glass fiber reinforced thermoplastic resin pellets, (a) is a front view and (b) is a side view.

FIG. 8 shows an example of conventional glass fiber reinforced thermoplastic resin pellets, (a) shows a chopped strand as a reinforcing material, and (b) shows a strand drawn from direct roving as a reinforcing material. It is a schematic explanatory view.

[Explanation of symbols]

 6 Monofilament 7 Glass Fiber Strand 9 Glass Fiber Strand Roll (Cake) 11 Thermoplastic Resin 30 Continuous Glass Fiber Reinforced Thermoplastic Resin Pellets

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area // B29K 105: 10

Claims (5)

[Claims] 1. A step of drawing out a plurality of continuous glass fibers from a glass fiber winding body and introducing them into a resin impregnating mold at the same time, and feeding a molten thermoplastic resin into the resin impregnating mold to obtain the continuous glass. A step of impregnating the fiber, a step of pulling out the continuous glass fiber impregnated with the thermoplastic resin from the resin impregnation mold, and cooling and hardening the thermoplastic resin, and a predetermined linear molded product A method for producing continuous glass fiber-reinforced thermoplastic resin pellets, which comprises a step of cutting into lengths, wherein the continuous glass fibers are 6 to 25 from a glass melting furnace.
A large number of μm-diameter monofilaments are drawn out, divided into multiple glass fiber strands by a splitter and bundled, and these multiple glass fiber strands are arranged in parallel and wound in a drum shape while traversing with a spiral wire. A method for producing continuous glass fiber reinforced thermoplastic resin pellets, which comprises using a plurality of glass fiber strands drawn from a body. 2. The production of continuous glass fiber reinforced thermoplastic resin pellets according to claim 1, wherein the number of glass fiber strands that are separately bundled and wound by the splitter is 2 to 8 per wound body. Method. 3. The production of continuous glass fiber reinforced thermoplastic resin pellets according to claim 1, wherein the number of monofilaments bundled per one glass fiber strand divided and bundled by the splitter is 1200 or less. Method. 4. Molding is performed so that the glass fiber content of the pellets is 30 to 85 wt%.
4. The method for producing continuous glass fiber reinforced thermoplastic resin pellets according to any one of 3 above. 5. The glass fiber winding body according to claim 1, wherein 7 to 35 glass fiber winding bodies are used, and the glass fiber strands drawn out from each glass fiber winding body are simultaneously introduced into the resin impregnating mold. The method for producing a continuous glass fiber-reinforced thermoplastic resin pellet according to any one of claims.