KR830000444B1 - Molded Material Structure - Google Patents

Abstract

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Description

Molded Material Structure

1 is a vertical sectional view of one embodiment of the present invention in the form of a cylindrical pellet having five inner bodies of thermoplastic resin containing glass fiber filaments inserted into an outer covering layer of the thermoplastic resin.

FIG. 2 is a partial exploded view of the cylindrical pellets of FIG. 1 along the line of FIG. 1, showing only the outer coated resin layer portion from which the inner resin body containing the glass fiber filament is removed.

3 is a perspective view of the inner resin removed from the cylindrical pellets as shown in FIGS. 1 and 2;

4 is a schematic representation of a known structure showing a milled state.

5 is a schematic diagram showing the steps of the method for producing a molded material structure of the present invention.

6 is a longitudinal sectional view of one embodiment of a mold for use in the manufacture of the shaped material structure of the present invention.

The present invention relates to an improved molding material structure of a thermoplastic resin composition capable of producing a molding material in which glass fibers having different average lengths of fibers are uniformly dispersed in a resin matrix in order to enhance various properties of the molding material. Has improved manufacturing properties and does not have problems such as damage to the molding machine by frictional wear with the contained glass fibers.

Molding materials of glass fiber reinforced thermoplastics have been used as useful molding materials having excellent intrinsic moldability as well as good physical properties, in particular mechanical strength. Since the oil shock of 1973, they have drawn attention to the use of high value-added materials and have tried to improve their physical properties. In the known art, these shaped materials have been produced in particular from various materials, in particular by injection molding. Typical injection molding materials commercially useful for glass fiber reinforced thermoplastic products among them consist of chopped strands of glass fibers dispersed in a thermoplastic resin produced by extruding the thermoplastic resin together with the glass fibers.

In addition, moldings of other molds having glass fiber cores embedded in thermoplastic as outer coating or shell are already known from US Pat. Nos. 2,877,501 and 3,608,033. The molding material of the electronic mold has the advantages of a simple and easy manufacturing method, but it is impossible to have a mono-filament having a longer length, which is uniformly dispersed in all resins. Therefore, this mold molding material can limit the reinforcing effect limited to the inherent glass fibers in such structures. On the other hand, in the latter type of molding material, the glass fiber is provided as a core at the center of the material coated with the single layer coating material of the thermoplastic resin. Therefore, the glass fibers are not uniformly dispersed in the resin when made into a molded article. Moreover, the problem that the molding material damages the molding machine parts by molding cannot be solved by the single layer coating of the glass fiber because the glass fiber exposed by the decomposition of the outer skin is in direct contact with such mechanical parts. Because.

An object of the present invention is to form a glass fiber reinforced thermoplastic resin which can be molded into a material in which glass fibers having a long length are uniformly dispersed to enhance the reinforcing properties of the thermoplastic resin, without damaging the molding machine by frictional wear. To provide a substance.

Another object of the present invention is to provide a method for producing a molding material of the glass fiber reinforced thermoplastic resin by a safe and simple method as well as economics.

It is a further object of the present invention to provide molded materials of glass fiber reinforced thermoplastics with enhanced physical properties, in particular mechanical strength.

According to the invention, (1) a bundle of glass fiber filaments and a non-oriented thermoplastic resin, wherein the glass fibers are each separated from each other and extend in parallel to each other through the non-oriented resin body And (2) an outer covering layer of oriented thermoplastic resin which is substantially oriented in the axial direction of the glass fiber filament and which can fuse with the non-oriented thermoplastic resin in the inner columnar body.

The improved molding material structure of the present invention is described in more detail with reference to the accompanying drawings.

As shown in FIG. 1, at least one inner resin body 2 containing a number of single filaments 3 is embedded in the outer coated resin layer 1. In one embodiment, the inner thermoplastic body needs to be unoriented while the outer thermoplastic layer needs to be nearly oriented in the present molding material structure. The terms "unoriented" and "nearly oriented" herein indicate in which room the resin shrinks when measured under conditions as described below.

The inner thermoplastic resin body 2 of this structure contains a large number of short filaments, which extend parallel to each other through the resin body in the longitudinal direction of the resin body as shown in FIG.

Since the resin in the inner resin body has an inter-border action for separating the filaments from each other, the resulting molded article has a longer length and contains uniformly dispersed glass fibers. Such structure of the inner body is significant because it is not well separated from each other and the glass fibers contained in the filament bundle in the molding material are not uniformly dispersed in the resulting molded article. The filaments in the inner body 2 can be derived from commercially available glass fiber irradiation. Such glass fiber irradiation is usually composed of 500-20000 strands of filament having a diameter of 8-20 microns. These glass fiber irradiations are usually treated with a scavenger, i.e. a typical silicone type binder, during the manufacturing stage of the glass fibers. Most glass fiber irradiations currently available contain about 1% by weight of the binder, ie a lubricant or a connecting agent. The shape of the inner body is not particularly limited as long as such a large number of filaments of glass fibers can extend through the resin model in parallel to each other. Its vertical section is usually elliptical or circular, while it may be triangular, square or polygonal. The number of such inner bodies may vary from 1-40 or more, preferably 1-10, depending on the various conditions of use or production method, but 1-5 is most preferred.

As mentioned above, the outer coating resin layer of the present molding material structure needs to be almost oriented in the axial direction of the glass fibers contained in the inner resin body as described above in 1. One of the advantages of the molding material structure of the present invention is that it causes little damage to the molding machine parts during the molding operation. Without being limited by any theory, such effects are attributable to the special structure of the present invention.

In injection molding, the pellets of the molding material are not melted in the area extending from the feed zone to the compression zone of the injection or extrusion machine screw, but melting of the pellets occurs simultaneously with its grinding. Friction wear of metals such as screws or barrels is considered to be due to friction with the glass fibers before the glass fiber containing resin is melted. For example, in the case of mixed fiberglass compositions of known technology, the wear in the area from the supply zone to the compression zone is so great that injection molding machines sometimes fail to produce the desired molded product after one month of operation. On the other hand, hardening of the screw or barrel hardly occurs in the melting, mixing, and measuring portions of the screw sufficiently melted so that the thermoplastic resin exhibits excellent lubricating effect. The special structure of the present invention locally prematurely melts the thermoplastic resin around the glass fibers. That is, the outer coating resin layer oriented in the axial direction of the glass fiber is easily broken (longitudinally pulverized) in the direction oriented through the shear stress in the feed zone and the compression zone of the screw.

As a result of such longitudinal grinding of the outer coating resin, the molding material is separated into an inner body containing an oriented outer layer and a glass fiber filament enclosed in an unoriented thin resin layer (see also FIGS. 2 and 3). Thus, the inner resin body containing the glass fiber filaments is removed from the outer coating resin layer so that the thin resin portion around the glass fiber is directly heated in the screw without melting the intermediate layer of low thermal conductivity and readily melted.

On the other hand, as shown in FIG. 4A, when the glass fibers are enclosed in only one non-oriented resin structure, it takes time for all the thick resin parts to melt around the glass fibers, so that the molding machine rubs against the screw or barrel. It is subjected to wear and tear, and moreover, the glass fibers are broken together with the resin, thereby failing to produce molded articles containing glass fibers of average length.

On the other hand, as shown in FIG. 4B, when the bundle of glass fiber filaments is surrounded only in the alignment resin, the glass fibers are exposed as a result of the longitudinal grinding of the alignment resin in the screw in order to directly contact the metal so as to be rubbed.

In the structure of the molding material according to the present invention, the glass fiber content in the inner thermoplastic resin body is 5-60% by weight based on the total composition and the ratio of the non-oriented resin in the inner body is 0.25-18% by weight and the orientation resin of the outer coating resin layer The ratio is 94. 75-22% by weight and these ratios are for the total composition.

In the present invention, the thermoplastic resin used for the oriented outer coating resin layer needs to be fused with the thermoplastic resin used for the non-oriented resin body. As used herein, the term "compatible" means that one resin contains a co-monomer contained in another resin, or that no mutual delamination occurs between one resin and the other. Typical compatibility of thermoplastics for use in the inner and outer layers, respectively, is shown in Table 1 below.

TABLE 1

Co., Ltd. = Convergence L = Limited

N = incompatibility: PS = polystyrene (including high impact polystyrene), AS = acrylonitrile-styrene copolymer, ABS = acrylonitrile-butadiene-styrene copolymer (methyl methacrylate-butadiene-styrene, methylmethacrylate Acrylate-acrylonitrile-butadiene-steel and acrylonitrile-butadiene-α-methyl-styrene-styrene copolymer)

PPE = polyphenylene ether (including modified PPE), PE = polyethylene; PP = polypropylene, POM = polyoxyethylene, PC = polycarbonate, PA = polyamide, PMMA = polymethyl methacrylate, PVC = polyvinylchloride

The degree of orientation of the outer covering thermoplastic layer can be easily measured and tested by compression failure of the molding material, for example by forceps with force or the like to achieve its longitudinal grinding. By such a test method, it is easy to see the in-cylinder grinding state of the molding machine as mentioned above. However, the actual orientation required for the outer thermoplastic resin layer is defined as having a heat shrinkage of at least 0.5% in the axial direction, which means that the orientation resin for which the non-oriented glass fibers containing the inner layer are removed is removed from the orientation resin for about 30 minutes. It is observed when exposed to heating to a high temperature by Vicat softening point (ASTM-D-1525) of more than 45 ℃. Such degree of orientation can be easily imparted to the resin by extruding the molten resin through an extruder and then cooling.

Unoriented thermoplastics in the inner body as described above can usually be derived from emulsions of thermoplastics. For penetration through short filaments of glass fiber irradiation, such emulsions need to have a low viscosity of less than 100 centipoise and an affinity with glass fibers. For this purpose, it is preferable to use an aqueous emulsion with small particles of thermoplastic resin dispersed in water. When glass fiber irradiation is immersed in such an aqueous emulsion and then dried, small particles of the resin adhere around each stage filament of the glass fiber. Such small particles of thermoplastic resin form an almost unoriented resin model when melted at high temperatures enough to fuse with one another.

The molding material produced because the resin element in the non-oriented resin model preferably has the same or better melt flow properties (ie, having a lower molecular weight) than that of the thermoplastic resin for the outer layer. Dispersion of the glass fibers in the injection molded product obtained from these improves the physical properties, i.e., Izod impact strength of about 10-20%.

The molding material structure of the present invention is not particularly limited in its form and includes all sizes and sizes known in the art as pellets. However, it is preferable to form a cylinder having a circular or elliptical insulation perpendicular to the axial direction of the glass fiber contained therein having a short diameter of 1-8 mm and a long diameter of 1-15 mm, and the length of the cylinder is preferably 1-20 mm. Do. If desired, other forms may be used including cylinders with triangular, square, polygonal cross sections.

Various methods can be used to produce the shaped material structure of the present invention as described above. With reference to a preferred embodiment of the method according to the invention as illustrated in FIGS. 5 and 6, the method of making the present molding material structure is described in detail below.

In the method of the present invention, at least one glass fiber including 500-20000 strands of filaments is treated with an aqueous emulsion of a thermoplastic resin to uniformly disperse each filament in the emulsion and then dried to form a non-oriented thin mutual partition resin. Forming an inner thermoplastic body containing glass fiber short filaments separated by and extending parallel to each other, and then extruding the coating agent on the formed inner layer of another thermoplastic resin capable of fusing with the thermoplastic resin for the inner body; Forming an outer coating layer oriented in the extrusion direction on the non-oriented inner resin body and rounding the glass fiber irradiation surrounded by the double structure layer with a pellet of a suitable size.

One of the features of the process according to the invention is the pretreatment of glass fiber irradiation with an emulsion of thermoplastics which can be fused with the thermoplastics used for extrusion coating. As mentioned above, commercially available glass fiber irradiation usually uses bundles of about 2000 filaments, each filament being unable to fuse with glass fibers having a diameter of about 10 microns and to extruded coatings of highly viscous molten resin. It is generally almost impossible to cover each element of the filament by this. By treating glass fiber filaments previously made hydrophilic with a low viscosity aqueous emulsion, each of the glass fiber filaments is coated with the resin to enhance the dispersibility (diffusion) of the glass fibers in the thermoplastic resin as well as the protection of the glass fibers.

As shown in FIG. 5, the glass fiber irradiation 4 reaches and is immersed up to the pretreatment bath 5. The pretreatment bath 5 is provided for coating an aqueous emulsion of the same kind as the thermoplastic resin 13 supplied from the extruder 7 or a resin which can be fused therewith. The aqueous resin emulsion allows penetration into the glass fiber irradiation 4 and covers each element of the glass fiber short filament with an aqueous resin emulsion penetrating and adhering to the liquid tank.

The glass fiber irradiation is immersed in the resin emulsion can be simply performed by passing the resin emulsion contained in a conventional liquid bath. In addition, a vibrator such as an ultrasonic vibrator is provided in the emulsion liquid tank so as to vibrate the emulsion, so that the immersion effect (coating effect) can be satisfied and the manufacturing speed can also be increased.

The amount of emulsion adhered by the coating in the pretreatment tank may be 5-30 parts by weight, preferably 15-25 parts by weight, calculated as the amount of resin attached after drying the emulsion per 100 parts by weight of the emulsion coated glass fiber irradiation after drying. have. In an amount of 5 parts by weight or less, the glass fibers cannot be completely dispersed in the thermoplastic resin, and an amount of 30 parts by weight or more is an amount that cannot be uniformly coated by one immersion. In order to coat such a large amount of resin, it is necessary to attach it several times or by some other special device.

Such a special device is not necessary for the purposes of the present invention.

The replacement urea in the resin emulsion (mainly resin urea) is in the range of 30-70% by weight when contained in a conventional commercially available emulsion, and does not require a special emulsion to be used.

The emulsion coated on glass fiber irradiation 4 in pretreatment tank 5 is dried by heater 6. Heater 6 may be using radiant heat, such as a nichrome wire heater, or using heated air. The use efficiency of electricity is good when drying is performed using an infrared heater. The internal ambient temperature in heater 6 through which fiberglass irradiation 4 passes is about 100-350 ° C. For some latexes with poor thermal resistance and irregular heat shrinkage at high temperatures such as SB latex, drying at 100-150 ° C. is preferred.

The extruder can be a commonly used extruder for thermoplastics as long as it can stably supply a uniformly aqueous molten resin of production to mold 8.

Extrusion mold 8 is provided for the purpose of extrusion coating of glass fiber irradiation, which may be a mold frequently used for wire coating or the like. However, when, for example, five bundles of glass fiber irradiation have to be included in one pellet, it is preferable to introduce five bundles of emulsion-treated glass fiber irradiation one by one into the mold individually as described above. Furthermore, it is desirable to have a mold structure capable of performing five different coatings, i.e., double coating, by such a method of tying five bundles to one point in the mold.

Double extruded coatings, as mentioned above, are loosened so that the filaments are exposed to the surface of the extruded coated yarn (linear body) when only one coating is applied, usually consisting of a bundle of very thin filaments 500-20000 strands. It is preferable because it is easy. The glass fibers exposed on the surface can be separated in the subsequent rounding step from the resin due to insufficient adhesion to the resin, resulting in undesirable dispersion of such separated glass fibers.

The mold structure, which may vary depending on the production rate, preferably increases the internal pressure in the resin, and the pressure generated by the extruded resin can act in a direction to relieve the pulling force applied to the coated thread. 6 shows one embodiment of an extrusion coating mold for double coating.

Heaters 6 and mold 8 are preferably arranged such that the dried and heated glass fiber irradiation in heater 6 can be gently introduced into mold 8 without sudden bending and excessive cooling. There is a fear that the glass fiber irradiation with more than 5% of the adhered fluid breaks so as to cause its entanglement at the inlet of the mold when it is rapidly curved.

The strand having the fiberglass core coated with the thermoplastic resin by the extrusion coating mold 8 on the desired containing fiberglass is cooled in the cooling water tank 9 to be solidified and wound by the roll 10. The strand is rounded by a pelletizer 11 with the desired strength. The pellets are stored in hopper 12 to provide for use as a molding material.

The glass fiber component in the final glass fiber reinforced with the thermoplastic resin molding material is preferably 5-60% by weight. Less than 5% by weight of the component does not exhibit a significant reinforcing effect by the glass fiber, it is difficult to form a molding material when more than 60% by weight. The amount of the resin to be coated by the emulsion treatment is 0.25-18% by weight, and the amount of the resin to be coated by the extrusion coating is 94.75-22% by weight. In the first step, the thermoplastic resin to be used in the emulsion and the thermoplastic resin to be used for extrusion coating are homogeneous or different compatible resins. Such thermoplastic resins are generally selected from the resins as shown in Table 1. Examples in which these resins, which are widely used commercially, are well matched, are shown in Table 2 below.

TABLE 2

The thermoplastic resins used in the present invention generally have a melt-flow rate in Table 3 which is measured by ISO-R 1133-1969, a melt flow rate meter for thermoplastics or by a similar method under the conditions given in Table 3. Have

TABLE 3

Table 4 below is a mixture of the injection-molded test piece prepared from the molding material of the present invention using the AS resin, which is a thermoplastic resin obtained by the method described above in Example 1, and the cut strand of glass fiber by the AS resin ( Apply the emulsion coating of the AS resin to the glass fibers (see Example 2), apply the extrusion coating of the AS resin to the glass fibers (see Example 3), and dissolve in the glass fiber in methyl ethyl ketone. The solution coating of the AS resin is preferentially applied (see Example 4), and the physical properties are compared in comparison with the injection molded test pieces produced by known methods using the same AS resin respectively.

TABLE 4

When the glass fiber reinforced thermoplastic resin molding composition of the present invention is used as described in Table 4, glass fiber reinforced AS resins having excellent physical properties and commercially available in terms of impact strength (Izod impact strength) and heat resistance (thermal bending temperature) ( Compared to Example 1), it is possible to obtain injection molding products about twice as good. Furthermore, it was found that creep properties were significantly improved at high temperatures. It is believed that this excellent physical property is due to the uniform dispersion of the glass fiber filaments and the longer average length of the glass fibers in the thermoplastic resin of the injection molded article produced from the pellets of the present invention. Moreover, injection molded articles made from the present molding materials have better physical properties than injection molded articles made from other known materials, and the injection molding machine can be freed from wear and tear by using the molding materials of the present invention.

The invention is further clarified by the following examples and comparative examples.

Example 1

Four bundles of glass fiber (2000, 13 mu filament in one bundle) are immersed in the oily resin of AS resin (AN = 25%, M.F.R. = 5g / 10min) which is 50% of a solid component. The desired glass fiber bundle coated with the emulsion is dried at 200 ° C. under atmospheric pressure. After drying, the coated AS resin contains 80 parts by weight of glass fiber and 20 parts by weight of AS resin.

The AS resin is extruded through an extruder maintained at a barrel temperature of 160-180 ° C. on the hopper side, a barrel temperature of 200-220 ° C. on the outer outflow side and a mold temperature of 220 ° C. at a rate of 12 kg / hour applied to the mold.

The winding speed of the glass fiber bundle treated with the oily solution obtained above is adjusted to 20 mm / min by the extrusion radius of the 3.8 coated strand. This strand is cut into pellets 3.5 mm long by a granulator. The resulting pellets comprised 20% by weight of glass fibers, 4% by weight of unoriented AS resins and 75% by weight of oriented AS resins. The degree of orientation of the AS resin is measured at 160 ° C. by the method described above at 1% shrinkage. The pellets can be easily broken by forceps that separate the pieces of the alignment resin and the non-oriented resin contained in the glass fibers.

These pellets are molded by conventional injection molding to obtain an object having physical properties as shown in Table 4. In addition to the good physical properties mentioned above, the degree of dispersion of the glass fibers in the molded object has been found to be good without the ball of glass fibers. Furthermore, the melt flow characteristics of the AS resin obtained by salting the oil phase used in the present example and the AS resin supplied from the extruder are compared. Melt outflow properties of these resins are measured by means of a melt outflow rate measuring device such as ISO R1133, for example, under conditions of 10 kg drop, which give the same effect of 220 ° C., 5 g / 10 min.

Example 2

After salting, AS resin with a melt flow rate of 10 g / 10 minutes and AS resin with a melt flow rate of 5 kg / 10 minutes supplied from the extruder were used to produce kernels having a strand radius of 3.8 mmø and a thread length of 3.5 mm. The procedure of Example 1 is repeated under the same conditions as in Example 1 to be described. Injection molding of the final pellets by conventional methods yields molded objects exhibiting better dispersion of the glass fibers dispersed in the moldings and improved surface and glossiness on the surface. Melt outflow properties (injection molding pressure) were also slightly improved (about 10% reduction). In terms of physical properties, Izod impact strength was improved to 13 kg cm / cm compared to Example 1, and other properties were slightly improved compared to Example 1.

Example 3

Four bundles of glass fibers (2000ol, 15μø mono-filament in one bundle) are immersed in styrene-butadiene resin (St / Bd = 6/4) emulsion (45% solids) and dried at 110 ° C. After drying, the bundle coated with the emulsion contains 85 parts by weight of the glass fibers and 15% by weight of the styrene-butadiene resin. The polystyrene resin is extruded through an extruder that maintains a hopper surface temperature of 160-180 ° C. and an external surface temperature of 200-220 ° C. and a mold temperature of 220 ° C. applied to an extrusion coating mold. The glass fibers are crimped at a speed of 5 m / min with an extruded strand radius of 3.2 mm. The thread is cut into kernels 5 mm long. The kernels comprise 30% by weight of the glass fibers, 5.3% by weight of the non-oriented SB resin and 64.7% by weight of the oriented PS resin. When injection molding of kernels is carried out by conventional methods, the degree of dispersion of the glass fibers is good for obtaining an injection molded product having improved physical properties.

The styrene-butadiene resin used in this example has a melt flow rate of 10 g / 10 minutes, and the polystyrene resin has a melt flow rate of 3 g / 10 minutes. (Measured under ISO-R1133, Procedure 8- Conditions)

Example 4

To coat three bundles of glass fibers (each bundle contains 2000 OL filaments with a radius of 13 µ), each was immersed in a 40% solid soluble polystyrene resin emulsion and maintained at 200 ° C at atmospheric pressure. To dry. The composition coated with the polystyrene resin after drying is composed of 85 parts by weight of glass fibers and 15 parts by weight of polystyrene resin. The mixture of polyphenylene ether resin and polystyrene resin (PPE / PS = 4/6, MFR = 7 g / 10 min) was passed through an extruder at a cylinder temperature of 270 ° C. and a mold temperature at a rate of 75 kg / hour supplied in the mold, respectively. Extruded. The winding speed of the glass fiber irradiation prepared above is controlled at a speed of 20 m / min while winding the extruded coated strand radius of 3.2 mm and five strands at once. The final strand is cut into pellets by a granulator. The glass fiber component in the pellets is 20% by weight. These pellets are molded by conventional methods to obtain shaped bodies having an Izod impact strength of 20 kg cm / cm and a thermal bending temperature of 145 ° C. For comparison purposes, pellets of a mixture of 20% glass fibers and polyphenylene ether prepared by mixing polyphenylene ether and glass fibers in an extruder were prepared in the same manner as used in the above examples. This pellet is similarly injection molded to obtain an object with an Izod impact strength of 10 kg cm / cm and a thermal bending temperature of 140 ° C. From this comparison, the improved effect of the present invention is remarkable, and the glass fiber in the molded article of the present invention shows a good degree of dispersion without the accumulation (ball) of the glass fiber and shows a good appearance.

Example 5

Instead of the emulsion, a water-soluble emulsion of ethylene-vinylacetate copolymer (vinyl acetate: 28%) (solid: 50%) was used, and a high-density polyethylene (density = 0.950) instead of an AS resin for extruding the coating outer cover layer resin. , MI = 3 g / 10 min) is repeated except that the method of the embodiment.

The final molding material can make molded articles with improved physical properties over the same components shown in Example 1.

By the same steps as in Example 1, instead of the AS resin emulsion, a 20 wt% AS resin solution dissolved in an AS resin containing an equimolar amount of the AS emulsion in methyl ethyl ketone was prepared. The same glass fiber irradiation used in Example 1 is dipped in the AS resin solution and then dried. The dried irradiation contained 20% by weight of the AS resin.

Under the same conditions as in Example 1, the AS resin was subjected to extrusion coating on the irradiation until the final glass fiber component was 20% by weight.

The pellets obtained are injection molded to obtain a product in which glass fibers are insufficiently dispersed.

Injection molded products have various changes in physical properties, in particular Izod impact strength. On the other hand, this should take into account several factors that affect the physical properties of the molded article, such as the viscosity of the AS resin methyl ethyl ketone solution, the penetration of the resin solution in the irradiation, the balance of the resin coating to the irradiation, or the adhesion of the resin. The poor dispersion of glass fibers in the final molded article is due to the poor affinity between the glass fibers and methyl ethyl ketone since the complete coating cannot be applied to the glass fibers first.

As described above, the molding material of the glass fiber reinforced with the thermoplastic resin of the present invention is a molding material having an excellent reinforcing effect on the glass fiber. For the molding material of the present invention, various known molding materials such as an injection molding machine or an extruder can be used, and the molding material is used when applying such a device. In order to make the dispersion of glass fiber uniform with the material of the present invention, molded articles of excellent physical properties and good surface condition and gloss can be produced. Moreover, the oriented external resin is easily broken in the molding machine, and the non-oriented resin is present around the glass fiber as a thin film layer which is easily melted to lubricate between the glass fiber frame and the metals in the molding machine, thereby causing wear of the device. This is less. Therefore, the material provided in the present invention may be used in all of you.

Claims (1)

In thermoplastic resin pellets having a length of 1-20 mm and suitable for the production of molded parts, the pellets consist of at least one inner column body composed of glass fiber filament bundles and an oriented thermoplastic resin and without glass fiber filaments Wherein the fiberglass filaments are embedded in non-oriented thermoplastic resin and are separated from each other, and extend in parallel to each other in the non-oriented resin, wherein the oriented thermoplastic resin is axially oriented with the glass fiber filament It can be fused with the non-oriented thermoplastic resin in the inner pillar body, the fiber composition is 5-60% by weight, the thermoplastic resin in the inner body is 0.25-18% by weight and the thermoplastic resin in the outer coating layer is 94.75-22 The thermoplastic resin pellets, characterized in that the weight%.

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