JP4524865B2 - Paper rope pellets - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rope-like pellet formed by a glass fiber bundle impregnated with a resin.
[0002]
[Prior art]
In order to obtain a plastic molded product with an injection molding machine, first, a plastic material melted and kneaded in a kneading section is injected into a mold, and then the molten plastic is cooled and solidified in a state following the mold. In addition, in order to obtain a high-strength plastic molded article excellent in impact resistance and the like, pellets containing reinforcing fibers such as glass fibers in a thermoplastic resin may be used as a raw material.
[0003]
As pellets containing such reinforcing fibers, conventionally, for example, glass fibers having a length of about 3 to 6 mm and a powdery or granular thermoplastic resin are mixed and further kneaded by a kneader, and then a predetermined length. Some are obtained by cutting (for example, about 3 mm). However, the glass fiber in the obtained pellet is pulverized when kneaded by a kneader, and the length is shortened to about 0.2 mm to 0.5 mm. Furthermore, when a plastic molded product is molded by an injection molding machine using such pellets, the glass fiber is further pulverized in the kneading part, and the glass fiber contained in the plastic molded product is as short as about 0.1 to 0.4 mm. turn into. For this reason, the high reinforcement effect of the molded product by the reinforcing fiber is hardly desired.
[0004]
Therefore, in order to solve such a problem, a pellet obtained by impregnating a long glass fiber bundle as a reinforcing fiber with a thermoplastic resin has been developed. According to this pellet, the length of the reinforcing fiber becomes equal to the length of the pellet (for example, 10 mm). Therefore, even if the reinforcing fiber is kneaded by the kneading part of the injection molding machine, the glass fiber in the molded product is 0.3-0. It becomes about 7 mm, and the strength of the plastic molded product can be improved as compared with the case of using the pellets.
[0005]
[Problems to be solved by the invention]
However, even if a pellet containing such a long glass fiber bundle as a reinforcing fiber is used, it is difficult to say that the plastic molded product has been sufficiently reinforced, and the pellets that can further improve the strength of the molded product. Development was desired.
[0006]
The present invention has been made in view of such circumstances, and an object thereof is to provide a pellet having a high reinforcing effect.
[0007]
[Means for Solving the Problems]
The staple rope pellets of the present invention are twisted into a plurality of glass fiber bundles impregnated with a resin, whose cross-sectional shape is adjusted and the amount of the resin is adjusted, and bonded to each glass fiber bundle by impregnation into a rope shape. It is characterized by that.
[0008]
According to the scallop rope according to the present invention, a plurality of glass fiber bundles as reinforcing fibers are twisted and formed into a squirrel rope shape, so that the length of the glass fiber bundle included per unit length of the pellet is increased. And the reinforcing effect of the pellets is enhanced. In addition, when a plastic molded product is molded by injection molding using the staple rope pellets of the present invention, even if the glass fiber bundle is cut at the kneading part of the injection molding machine, the glass fiber bundle is twisted together, so the molded product. Since each glass fiber bundle in the inside is long and remains as a fiber bundle, a high reinforcing effect can be maintained.
[0009]
Moreover, it is preferable that each glass fiber bundle is twisted in the staple rope pellet of the present invention.
[0010]
When it is set as such a structure, the length of the glass fiber bundle contained per unit length of a pellet becomes still longer, and the improvement of a reinforcement effect can be aimed at.
[0011]
Moreover, it is preferable that the twisted rope pellet of this invention contains the twist of 1 turn or more per 25 mm in length.
[0012]
If the scalloped rope pellets are formed with such a twist, the reinforcing effect can be remarkably improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, with reference to an accompanying drawing, a suitable embodiment of a messenger pellet concerning the present invention is described in detail. In addition, the same code | symbol shall be used for the same element and the overlapping description is abbreviate | omitted.
[0014]
[First Embodiment]
Fig.1 (a) is a side view which shows the rope rope pellet of this embodiment, FIG.1 (b) is a figure which shows the state which untwisted the rope rope pellet of Fig.1 (a) for easy understanding. is there. As shown in FIG. 1 (a) and FIG. 1 (b), the rope rope pellet 10 is formed by twisting three glass fiber bundles 20a, 20b and 20c as reinforcing fibers into a rope shape. Each glass fiber bundle 20a-20c is impregnated with a resin (thermoplastic resin) 7 such as nylon.
[0015]
Next, with reference to FIG.2 and FIG.3, the manufacturing method of the female rope pellet 10 is demonstrated. FIG. 2 is a configuration diagram illustrating the pellet manufacturing apparatus 1. As shown in the figure, the pellet manufacturing apparatus 1 of the present embodiment accommodates a molten resin 7 introduced from a molten resin inlet 3 and is fed with glass long fibers (glass roving) fed from an upstream drum 2. _Three molten resin tanks 30 for impregnating the resin 7 into L _{1 to} L ₃ are provided, and the glass impregnated with the resin 7 is provided at the most downstream portion (right end in the figure) of each molten resin tank 30. A die 5 for adjusting the cross-sectional shape of the long fibers L _{1 to} L ₃ and adjusting the amount of resin is mounted. Further, on the downstream side of each molten resin tank 30, a glass twisted glass 50, which twists the long glass fibers L _{1 to} L ₃ that have passed through the respective dies 5 into a single rope, and a twisted glass. And a cutting device 60 for cutting the long fibers L _{1 to} L ₃ .
[0016]
In addition, each molten resin bath 30, impregnated roller 12 four pairs for impregnating the resin 7 was opened while opening the glass fiber L ₁ ~L ₃ long glass fiber L ₁ ~L ₃ is It is juxtaposed. These impregnating rollers 12 do not have a drive mechanism and rotate with the flow of the long glass fibers L _{1 to} L ₃ .
[0017]
Further, the pellet manufacturing apparatus 1 includes a pair of driving rollers 70 disposed upstream of the impregnation roller 12 in each molten resin tank 30 and a pair of twisting apparatuses 50 and a cutting apparatus 60. A feed roller 80 is provided. The driving roller 70 and the feed roller 80 are rotationally driven so as to convey the long glass fibers L _{1 to} L ₃ in the right direction in the drawing by a driving device such as a motor (not shown). That is, the long glass fibers L _{1 to} L ₃ wound around the drum 2 are conveyed to the cutting device 60 through the impregnation roller 12 by the cooperation of the driving roller 70 and the feed roller 80.
[0018]
Next, the twisting device 50 will be described with reference to FIG. The twisting device 50 includes a cylinder 51 to which a hook 52 for collectively hanging the long glass fibers L _{1 to} L ₃ is attached. The right end of the cylinder 51 in the drawing is an open end, and the left end in the drawing is The ring-shaped fiber introduction part 53 is attached. Further, the Goyo device 50, the motor 54 is provided, it is possible to rotate the motor 54 is transmitted to the cylinder 51 via a belt 55, to Goyo long glass fiber L ₁ ~L ₃ . In addition, it is preferable to perform the twisting of the glass long fibers L _{1 to} L ₃ before the resin 7 is cooled and solidified. When the resin 7 is cooled and solidified, the rigidity becomes strong and it becomes difficult to twist the long glass fibers L _{1 to} L _3, and the long glass fibers L _{1 to} L ₃ are not bonded (fused) to maintain the rope shape. This is because it becomes difficult.
[0019]
Then, the twisted glass long fibers L _{1 to} L ₃ can be cut by the cutter of the cutting device 60 to obtain a plurality of staple rope pellets 10. Incidentally, the long glass fiber L ₁ ~L _3, by being cut by the cutting device 60, the glass fiber bundles 20a~20c shown in FIGS 1 (a).
[0020]
According to the shim rope pellet 10 thus obtained, the following effects can be obtained. That is, since the staple fiber pellet 10 is formed into a staple rope shape by twisting a plurality of glass fiber bundles 20a to 20c as reinforcing fibers, the length of the glass fiber bundles 20a to 20c included per unit length of the pellet. Can be lengthened, and the reinforcing effect of the pellets is enhanced. Further, when a plastic molded product is molded by injection molding using the scallop rope 10, the glass fiber bundles 20 a to 20 c are twisted even if the sword rope pellet 10 is cut with a screw or the like of a kneading part of an injection molding machine. Therefore, since the glass fiber bundle contained in the plastic molded product becomes long, a high reinforcing effect can be maintained. Further, by twisting the long glass fiber L ₁ ~L _3, the resin 7 is uniformly dispersed in the fibers, it is possible to reduce the voids in the rope pellet 10. Furthermore, the tensile strength, the bending strength, and the Izod impact value of the molded product obtained from the crimped rope pellet 10 can be improved.
[0021]
Moreover, it is preferable that the number of twists of the crimped rope pellet 10 is 1 turn or more per 2.5 cm in length. The reinforcing effect can be remarkably improved by forming the crimped rope pellet 10 with such a twist. More preferably, it should be 5 turns or more per 2.5 cm length. One turn corresponds to the interval indicated by the symbol t in FIG. Furthermore, it is preferable that the length of the crimped rope pellet 10 is about 3 mm to 25 mm. This is because when the length of the rope rope pellet 10 is shorter than the above range, the glass fiber bundles 20a to 20c as the reinforcing fibers are short, so that it is difficult to exert the reinforcing effect. This is because the property decreases. Moreover, although the cross section of the seam rope pellet 10 of this embodiment is substantially circular, it is good also as a flat shape, an ellipse shape, etc. in addition to this. Furthermore, when the cross section of the lash rope pellet 10 is circular, the diameter is preferably about 1 to 10 mm.
[0022]
Alternatively, a plurality of glass fibers may be passed through one molten resin tank 30 without being provided with a plurality of molten resin tanks 30, and the resin 7 may be impregnated in the molten resin tank 30. In this case, since only one molten resin tank 30 is required, space saving can be achieved.
[0023]
[Second Embodiment]
Next, a second embodiment of the paper rope pellet according to the present invention will be described. FIG. 4A is a side view showing the rope rope pellet of the present embodiment, and FIG. 4B is a view showing a state where the rope rope pellet of FIG. 4A is untwisted for easy understanding. is there. As shown in FIGS. 4 (a) and 4 (b), the staple rope pellet 10 is formed by twisting three glass fiber bundles 40a, 40b, and 40c into a staple rope shape, and further, each glass fiber bundle 40a- 40c itself is twisted. Each glass fiber bundle 40a-40c is impregnated with a resin (thermoplastic resin) 7 such as nylon.
[0024]
FIG. 5 is a view showing a pellet manufacturing apparatus 11 for manufacturing the lacquer pellet 10 of the present embodiment. The pellet manufacturing apparatus 11 is different from the pellet manufacturing apparatus 1 used in the first embodiment in that a twisting apparatus 50 a is provided between each molten resin tank 30 and the twisting apparatus 50. The configuration of the twisting device 50a is the same as that of the twisting device 50 (see FIG. 3). Then, by rotating the cylinder 51 in a state where the long glass fiber L ₁ ~L ₃ multiplied each hook 52 of the twisting device 50a, it can be added twists to the long glass fiber L ₁ ~L _3.
[0025]
Moreover, twisting of each glass fiber L ₁ ~L ₃ which is twisted in Goyo device 50, by cutting this by cutting device 60, rope pellet 10 shown in FIG. 4 (a) is completed.
[0026]
According to the staple rope pellet 10 of the present embodiment thus obtained, the length of the glass fiber bundles 40a to 40c included per unit length of the pellet is further increased as compared with the first embodiment, and the reinforcement is performed. The effect can be improved.
[0027]
As mentioned above, although the invention made | formed by this inventor was concretely demonstrated based on embodiment, this invention is not limited to said each embodiment. For example, the number of glass fiber bundles to be twisted is not limited to three, and may be two or four or more.
[0028]
In addition to nylon, the resin impregnated into the long glass fibers is polyethylene, polypropylene, polyethylene terephthalate, polycarbonate, polyphenylene sulfide, polyphenylene oxide, polysulfone, polyether ether ketone, polyether imide, polyether sulfone, poly A known thermoplastic resin such as butylene terephthalate or a copolymer or modified body thereof can be used.
[0029]
【The invention's effect】
As described above, according to the staple rope pellet according to the present invention, a plurality of glass fiber bundles as reinforcing fibers are twisted together to form a staple rope shape, and thus the glass fiber bundle included per unit length of the pellet. The length of can be increased, and the reinforcing effect of the pellets can be enhanced. In addition, when a plastic molded product is molded by injection molding using the staple rope pellets of the present invention, even if the glass fiber bundle is cut at the kneading part of the injection molding machine, the glass fiber bundle is twisted together, so the molded product. Since each glass fiber bundle in the inside is long and remains as a fiber bundle, a high reinforcing effect can be maintained.
[Brief description of the drawings]
FIG. 1 (a) is a view showing a lash rope pellet of the first embodiment, and FIG. 1 (b) is a view showing a state in which the lash rope pellet shown in FIG. 1 (a) is untwisted. .
FIG. 2 is a view showing a pellet manufacturing apparatus for manufacturing the lacquered pellets of the first embodiment.
FIG. 3 is a view showing a twisting device of a pellet manufacturing apparatus.
FIG. 4 (a) is a view showing a lash rope pellet of the second embodiment, and FIG. 4 (b) is a view showing a state where the lash rope pellet shown in FIG. 4 (a) is untwisted. .
FIG. 5 is a view showing a pellet manufacturing apparatus for manufacturing a lacquered pellet of a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pellet manufacturing apparatus, 2 ... Drum, 3 ... Molten resin introduction port, 5 ... Die, 7 ... Resin, 10 ... Rope pellet, 11 ... Pellet manufacturing apparatus, 12 ... Impregnation roller, 20a-20c, 40a-40c ... Glass Fiber bundle, 30 ... Molten resin tank, 50a ... Twisting device, 50 ... Twisting device, 51 ... Cylinder, 52 ... Hook, 53 ... Fiber introduction part, 60 ... Cutting device, 70 ... Drive roller, 80 ... Feed roller, L _{1 to} L ₃ ... long glass fibers.

Claims (3)

A plurality of glass fiber bundles impregnated with a resin, whose cross-sectional shape is adjusted and the amount of resin is adjusted are twisted, and each glass fiber bundle is bonded with the impregnated resin to form a rope shape. Shimeji pellets.   The staple fiber pellet according to claim 1, wherein the glass fiber bundles are twisted.   3. The lash rope pellet according to claim 1 or 2, characterized in that it comprises a twist of one turn or more per 25 mm in length.

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