JP6903962B2 - Glass roving and its manufacturing method, and glass fiber reinforced composite resin material - Google Patents

Description

The present invention relates to glass roving in which glass strands are wound, a method for producing the glass roving, and a glass fiber reinforced composite resin material using the glass roving.

Conventionally, glass fiber is widely used as a reinforcing material for resin.

Patent Document 1 below discloses flat glass fiber-containing pellets in which a plurality of monofilaments having a flat cross section are arranged in pellets made of a thermoplastic resin. In Patent Document 1, both end faces of each monofilament are arranged in one direction so as to reach the pellet surface. The flat glass fiber-containing pellet of Patent Document 1 is molded and used by injection molding. The flat glass fiber-containing pellet of Patent Document 1 is produced as follows.

First, a plurality of monofilaments having a flat cross section are focused with a sizing agent to obtain a glass strand. This glass strand is wound around a winding core to prepare a wound body (glass roving). Next, the glass strands are drawn out from the produced wound body and applied to a continuous production apparatus to produce flat glass fiber-containing pellets. In the continuous manufacturing apparatus, the glass strands are conveyed into the hot-melted resin to adhere the resin, and then the glass strands are cut to a predetermined length in a state where the adhered resin is solidified. Flat glass fiber-containing pellets are produced.

International Publication No. 2007/091293

However, when the glass fiber-containing pellets are manufactured using a continuous manufacturing apparatus as in Patent Document 1, the glass strands may be broken in the manufacturing process, resulting in a decrease in productivity.

An object of the present invention is glass roving, a method for producing the glass roving, and glass fiber using the glass roving, which can reduce the breakage of the glass strand when the glass fiber-containing pellet is produced by combining with a resin. The purpose is to provide a reinforced composite resin material.

The glass roving according to the present invention is a glass roving in which a glass strand is wound, and both ends of the glass strand having a length of 2 m or more arbitrarily cut from the glass roving are separated by 2 m in the horizontal direction. When the glass strands are defibrated to form a monofilament while being fixed by the support members arranged in the glass strands, the amount of sagging of the defibrated monofilaments with respect to the straight line connecting the fixed positions of the glass strands. The maximum value is 40 mm or less.

In the glass roving according to the present invention, it is preferable that the coating film is made of a thermoplastic resin or a thermosetting resin.

In the glass roving according to the present invention, the glass strand includes 1900 to 10000 monofilaments and a coating film covering the surface of the monofilaments, and the fiber diameter of the monofilaments is in the range of 6 to 24 μm. The inner diameter of the glass roving is preferably in the range of 140 to 250 mm.

The method for producing glass roving according to the present invention is a method for producing glass roving according to the present invention, which comprises a step of cooling molten glass drawn from a bushing to form a plurality of monofilaments, and the plurality of glass rovings. A step of forming the glass strand by applying a sizing agent to the surface of the monofilament and focusing the plurality of monofilaments, and winding the glass strand into a collet having a diameter in the range of 140 to 250 mm. It is characterized by comprising a step of producing the wound body and a step of drying the sizing agent to form the coating film on the surface of the monofilament constituting the wound body.

The glass fiber reinforced composite resin material according to the present invention is characterized by containing a glass strand constituting a glass roving configured according to the present invention and a thermoplastic resin or a thermosetting resin.

According to the present invention, it is possible to provide glass roving capable of reducing breakage of glass strands when composited with a resin to produce glass fiber-containing pellets.

FIG. 1 is a schematic perspective view showing glass roving according to an embodiment of the present invention. 2 (a) and 2 (b) are schematic views for explaining an even test method. FIG. 3 is a schematic view showing a manufacturing apparatus used in an example of a method for manufacturing a glass fiber reinforced composite resin material according to the present invention.

Hereinafter, preferred embodiments will be described. However, the following embodiments are merely examples, and the present invention is not limited to the following embodiments. Further, in each drawing, members having substantially the same function may be referred to by the same reference numerals.

(Glass roving)
FIG. 1 is a schematic perspective view showing glass roving according to an embodiment of the present invention. As shown in FIG. 1, the glass roving 10 is formed by winding the glass strand 11. More specifically, the glass roving 10 has a cylindrical structure in which the glass strands 11 are stacked and wound so as to be layered.

In the present invention, when the even test shown below is performed, the amount of sagging of the monofilament 11a is 40 mm or less.

Hereinafter, the even test method will be described with reference to FIGS. 2 (a) and 2 (b).

First, the glass strand 11 drawn from the glass roving 10 is cut to a predetermined length (about 2 to 2.2 m). Subsequently, as shown in FIG. 2A, the support members 21a and 21b are arranged so as to be separated by 2 m in the horizontal direction x. At this time, both ends of the glass strand 11 are fixed to the support members 21a and 21b using an adhesive or the like. The support members 21a and 21b are provided so as to face each other at the same height position in the horizontal direction x, and are arranged so that the glass strand 11 can be held horizontally.

Next, as shown in FIG. 2B, the glass strands 11 fixed to the support members 21a and 21b are defibrated to form a monofilament. Subsequently, in the monofilamentized state, the amount of sagging is measured at the position where the amount of sagging of the monofilament 11a becomes the maximum value with respect to the straight line connecting the positions where the glass strands 11 are fixed by the adhesive in the support members 21a and 21b. .. In most cases, the measurement position is a substantially central portion in the horizontal direction x between the support members 21a and 21b. The amount of sagging of the monofilament 11a is the amount of sagging in the direction y orthogonal to the horizontal direction x in the substantially central portion thereof. Although a plurality of monofilaments 11a are present, the amount of sagging of the monofilament 11a is assumed to be the amount of sagging L of the most sagging monofilament 11a among the plurality of monofilaments 11a.

The defibration of the glass strand 11 refers to a state in which the monofilaments 11a bonded to each other by a sizing agent are manually separated one by one, and it is visually recognized that the entire glass strand 11 has been unraveled. In the measurement of the sagging amount of the monofilament 11a, if the sagging amount after the first defibration and the sagging amount after the second defibration are the same, the value is set as the sagging amount L, and if they are different, the defibration is performed again. This is repeated until the amount of sagging becomes the same as the previously measured value, and the last measured value is defined as the amount of sagging L.

The maximum value of the amount of hanging of the glass strand 11 measured by such a method is preferably 20 mm or more, more preferably 35 mm or less.

When the maximum value of the amount of hanging of the glass strand 11 is equal to or less than the above upper limit value, the difference in length of each monofilament 11a is small. Therefore, it is possible to reduce the disconnection of the glass strand 11 when the glass fiber-containing pellet is produced by combining with the resin.

Returning to FIG. 1, the inner diameter D of the glass roving 10 is preferably in the range of 140 to 250 mm. The inner diameter D of the glass roving 10 is more preferably 230 mm or less, still more preferably 200 mm or less.

By aligning the lengths of the monofilaments constituting the glass strand 11 to be wound, the breakage of the glass strand 11 is reduced. In order for the monofilaments to have the same length, it is necessary that the glass strands 11 are regularly wound around the collet and that the glass strands 11 are wound around the collet without loosening.

As the number of monofilaments constituting the glass strand 11 increases and the fiber diameter of the monofilaments becomes smaller, the lengths of the monofilaments tend to be uneven.

When the inner diameter D of the glass roving 10 is equal to or greater than the above lower limit value, the glass strand 11 can be wound around the collet even if the angular velocity of the collet in manufacturing the glass roving 10 is small. When the angular velocity is small, when the glass strand 11 is wound, the glass strand 11 is less likely to meander on the collet, so that the glass strand 11 is wound more regularly. By winding the glass strand 11 more regularly, it is possible to make it even more difficult for the glass strand 11 to break when the glass fiber-containing pellet is produced by combining with the resin. In addition, since the glass strand 11 is wound regularly, it becomes easy to obtain a glass fiber reinforced composite resin material having a higher mechanical strength.

Further, when the inner diameter D of the glass roving 10 is equal to or less than the above upper limit value, an appropriate tension is applied to the glass strand 11 when manufacturing the glass roving 10, so that the glass strand 11 becomes loose when wound around the collet. Is less likely to occur, and the glass strand 11 is wound more regularly. By winding the glass strand 11 more regularly, it is possible to further reduce the disconnection of the glass strand 11 when the glass fiber-containing pellet is produced by combining with the resin. In addition, since the glass strand 11 is wound more regularly, it becomes easier to obtain a glass fiber reinforced composite resin material having more excellent mechanical strength.

The glass strand 11 constituting the glass roving 10 preferably includes 1900 to 10000 monofilaments and a coating film covering the surface of the monofilaments.

The number of monofilaments is more preferably 6000 or less, still more preferably 4000 or less. When the number of monofilaments is not more than the above lower limit value, a glass fiber reinforced composite resin material having further excellent mechanical strength can be obtained. Further, the monofilament is pulled out from a nozzle provided at the bottom of the bushing, but as the number of monofilaments increases, a deviation occurs in the distance between the collet and each nozzle, so that the length of each monofilament tends to deviate. When the number of monofilaments is not more than the above upper limit value, the lengths of the monofilaments are likely to be uniform. Therefore, the breakage of the glass strand 11 can be further reduced when the glass fiber-containing pellet is produced by combining with the resin.

The specific composition of the monofilament is not particularly limited, but for example, E glass, S glass, D glass, AR glass and the like are used. Among these, E glass is preferable because it is inexpensive and a glass fiber reinforced composite resin material having more excellent mechanical strength can be obtained. Further, S glass is preferable because a glass fiber reinforced composite resin material having further excellent mechanical strength can be obtained.

The glass strand 11 is focused by applying a sizing agent to the surface of such a monofilament. Therefore, the glass strand 11 is a bundle of a plurality of monofilaments. After applying the sizing agent, a film is formed by drying in a temperature range of 100 to 130 ° C. for about 1 to 24 hours.

The material of the coating film is not particularly limited, but is preferably a thermoplastic resin or a thermosetting resin. Examples of the thermoplastic resin include polypropylene resin, modified polypropylene resin, nylon resin, polyphenylene sulfide resin, polyurethane resin and the like. Examples of the modified polypropylene resin include maleic acid-modified polypropylene resin. Examples of the thermosetting resin include polyvinyl acetate, polyester, epoxy resin and the like. When the glass fiber reinforced composite resin material is produced by compounding with a resin, the coating material can be appropriately selected in consideration of the affinity with the resin to be composited.

In the present invention, the fiber diameter of the monofilament is preferably in the range of 6 to 24 μm. The fiber diameter of the monofilament is more preferably 20 μm or less, still more preferably 17 μm or less. When the fiber diameter of the monofilament is not more than the above-mentioned lower limit value, the breakage of the glass strand 11 can be further reduced when the glass fiber-containing pellet is produced by compounding with the resin. When the fiber diameter of the monofilament is not more than the above upper limit value, it becomes easy to obtain a glass fiber reinforced composite resin material having further excellent mechanical strength.

The count of the glass strand 11 is not particularly limited, but is preferably 600 tex or more, more preferably 1200 tex or more, preferably 3000 tex or less, and more preferably 2400 tex or less. When the count of the glass strand 11 is not more than the above lower limit value, the breakage of the glass strand 11 can be further reduced when the glass fiber-containing pellet is produced by compounding with the resin. When the count of the glass strand 11 is not more than the above upper limit value, a glass fiber reinforced composite resin material having further excellent mechanical strength can be obtained.

Hereinafter, a method for manufacturing the glass roving of the present invention, such as the glass roving 10, will be described.

(Manufacturing method of glass roving)
The glass roving of the present invention can be produced, for example, by the following method.

First, the glass raw material put into the glass melting furnace is melted to obtain molten glass. The molten glass is homogenized and then pulled out of a platinum bushing. Then, the drawn molten glass is cooled to form a plurality of monofilaments. At this time, it is preferable to use a bushing having 1900 to 10000 nozzles to form 1900 to 10000 monofilaments.

Next, a sizing agent is applied to the surfaces of the obtained plurality of monofilaments. With the sizing agent applied evenly, a plurality of monofilaments are aligned and focused by the sizing shoe. Thereby, a glass strand is obtained. The fiber diameter of the monofilament is preferably adjusted to be within the range of 6 to 24 μm. The fiber diameter of the monofilament can be adjusted, for example, by changing the winding speed, the viscosity of the molten glass, or the like.

Next, the obtained glass strand is wound while applying a twill to a rotating collet to prepare a wound body. Subsequently, the winding body is removed from the collet, the sizing agent is dried, and a film is formed on the surface of the monofilament constituting the glass strand to obtain glass roving. It should be noted that the glass roving may be obtained by bundling and winding the glass strands unraveled from the obtained several glass rovings together. Further, as a collet for winding the glass strand, a collet having a diameter of 140 to 250 mm is used.

The glass roving produced as described above can be wound into a wound shape, stocked in that shape, and used as needed. The glass roving wound in a wound shape is stored in an organic film material such as shrink wrapping or stretch film for the purpose of preventing dust and dirt and protecting the fiber surface. can do. It may be stored in a state of being stacked in a plurality of stages.

The focusing agent for bundling the monofilament is not particularly limited, and for example, a thermoplastic resin or a thermosetting resin can be used. Examples of the thermoplastic resin include polypropylene resin, modified polypropylene resin, polyurethane resin, nylon resin, polyphenylene sulfide resin and the like. Examples of the modified polypropylene resin include maleic acid-modified polypropylene resin. Examples of the thermosetting resin include polyvinyl acetate, polyester, epoxy resin and the like.

The sizing agent may contain, for example, a silane coupling agent in addition to the above components. Specifically, as the silane coupling agent, aminosilane, epoxysilane, vinylsilane, acrylicsilane, chlorsilane, mercaptosilane, ureidosilane and the like can be used. By adding the silane coupling agent, the reactivity of the glass strand surface with the sizing agent can be improved, and the mechanical strength such as the tensile strength of the glass fiber reinforced composite resin material can be further improved. In addition to the above-mentioned silane coupling agent, the above-mentioned focusing agent can contain each component such as a lubricant, a nonionic surfactant, and an antistatic agent, and the compounding ratio of each component is necessary. It may be decided according to.

The amount of the sizing agent applied is preferably adjusted so that the ignition loss of the glass strand is 0.5 to 2.0% by mass. The ignition loss can be measured according to JIS R3420 (2013).

In the present invention, a collet having a diameter of 140 to 250 mm is used when winding the glass strand. The diameter of the collet is preferably 230 mm or less, more preferably 200 mm or less.

In the present invention, since the collet diameter is within the above range, the lengths of the monofilaments are likely to be uniform. Therefore, when the glass fiber-containing pellets are produced by compounding with the resin, the breakage of the glass strand can be further reduced. Further, even if the number of bushing nozzles is increased, the lengths of the monofilaments can be easily made uniform, and the number of monofilaments formed can be increased. If the number of nozzles is increased, the length of the monofilament pulled out from the end and center of the bushing tends to be uneven due to the meandering of the glass strand on the collet and the looseness of the glass strand. This is because the length of each monofilament can be made uniform by setting it within the above range. As described above, in the present invention, since the number of monofilaments can be increased, it is possible to obtain a glass fiber reinforced composite resin material which is more excellent in mechanical strength by being composited with a resin. In addition, the productivity when producing the glass fiber-containing pellets 20, which will be described later, can be further increased. At this time, the productivity can be further increased by increasing the count of the glass strands.

(Glass fiber reinforced composite resin material)
The glass fiber reinforced composite resin material of the present invention includes a glass strand constituting the glass roving of the present invention and a thermoplastic resin or a thermosetting resin. Examples of the thermoplastic resin include polypropylene resin, modified polypropylene resin, nylon resin, polyphenylene sulfide resin, polyurethane resin and the like. Examples of the modified polypropylene resin include maleic acid-modified polypropylene resin and the like. Examples of the thermosetting resin include polyvinyl acetate, polyester, epoxy resin, and the like.

The content of the glass strand in the glass fiber reinforced composite resin material is preferably 30 parts by mass or more, preferably 70 parts by mass or less with respect to 100 parts by mass of the thermoplastic resin or the thermosetting resin. When the content of the glass strand is within the above range, the mechanical strength of the glass fiber reinforced composite resin material can be further increased.

Further, it is desirable that the glass strand is cut from the glass roving of the present invention and used. The cut length of the glass strand is not particularly limited, but is preferably 10 mm or more and 20 mm or less. When the cut length of the glass strand is within the above range, the mechanical strength of the glass fiber reinforced composite resin material can be further increased.

Hereinafter, an example of a method for producing a glass fiber reinforced composite resin material according to the present invention will be described with reference to FIG.

First, as shown in FIG. 3, the glass strand 11 is pulled out from the inner layer of the glass roving 10 and conveyed to the defibrator 12 provided with three tension bars 12a. The glass strand 11 is defibrated by the defibrating device 12. By defibrating the glass strand 11, the glass strand 11 is in a state where it is easy to impregnate the inside with the resin.

Next, the defibrated glass strand 11 is conveyed to the impregnation device 13. In the impregnation device 13, the resin B is charged in advance from the charging port 13a and heated to prepare the heated melt 13b. The glass strand 11 is conveyed into the heated melt 13b by being taken up by the take-up machine 15. Thereby, the glass strand 11 is impregnated with the resin.

The glass strand 11 impregnated with the resin is conveyed to the cooling device 14. Thereby, the resin impregnated in the glass strand 11 is solidified. The glass strand 11 in which the impregnated resin is solidified is conveyed to the pelletizer 16 and cut to a predetermined length by a cutting roll 16a in which a plurality of cutting blades are radially arranged. Thereby, the glass fiber-containing pellet 20 is obtained.

The obtained glass fiber-containing pellet 20 is molded into a glass fiber reinforced composite resin material by injection molding or the like. At this time, a glass fiber reinforced composite resin material may be obtained by further adding a resin to the glass fiber-containing pellets 20 and kneading them, and then molding the pellets.

The glass fiber reinforced composite resin material of the present invention contains glass strands constituting the glass roving of the present invention. Therefore, when the glass fiber reinforced composite resin material is manufactured in the above manufacturing process, the glass strands can be less likely to be broken. This can be explained as follows.

Conventionally, when a glass fiber reinforced composite resin material is manufactured using a glass strand drawn from a glass roving, the glass strand may be broken when passing through a nozzle provided at an outlet in a heated molten body. .. This is because the lengths of the monofilaments constituting the glass strands are not uniform, so that the tension bar in the heating and melting body does not sufficiently apply tension, and the nozzles are clogged, resulting in disconnection.

On the other hand, in the glass roving of the present invention, since the amount of sagging in the even test is within the above range, the lengths of the monofilaments are likely to be uniform. Therefore, when the glass strand passes through the nozzle provided at the outlet in the heated and melted body, disconnection is unlikely to occur. Therefore, the productivity of the glass fiber-containing pellets can be increased, which increases the productivity of the glass fiber reinforced composite resin material.

Hereinafter, the present invention will be described in more detail based on specific examples. The present invention is not limited to the following examples, and can be appropriately modified and implemented without changing the gist thereof.

(Example 1)
First, the focusing agent is 2.0% by mass of maleic anhydride-modified polypropylene (hereinafter, modified PP) having a weight average molecular weight of 100,000, and γ-aminopropyltriethoxysilane (hereinafter, aminosilane, Shin-Etsu Chemical Industry Co., Ltd.). Made by Co., Ltd., trade name "KBE-903") is 0.3% by mass, polyethylene wax as a lubricant is 0.1% by mass, and a condensate of tetraethylpentamine as a lubricant and stearic acid (hereinafter TEPA / It was prepared by homogenically mixing with ion-exchanged water so that SA) was 0.015% by mass.

Next, the molten glass was pulled out from a bushing having 2000 nozzles so as to have the composition of E glass to obtain 2000 monofilaments.

Next, using an applicator, the above-prepared sizing agent was prepared and applied to the surface of the obtained monofilament so that the loss on ignition was 0.7% by mass, and 2000 monofilaments having a fiber diameter of 17 μm were applied. The glass strands obtained by focusing the particles were wound around a collet having a diameter of 150 mm to prepare a wound body. Then, the prepared wound body was dried at 100 ° C. for 20 hours to obtain glass roving. The count of the glass strand is 1200 tex.

Next, as shown in FIG. 3, the glass strand 11 was pulled out from the inner layer of the obtained glass roving 10 and conveyed to the defibrating device 12 provided with three tension bars 12a. Thereby, the glass strand 11 was defibrated.

Next, the defibrated glass strand 11 was conveyed to the impregnation device 13. In the impregnation device 13, a polypropylene resin material (manufactured by Exxon Mobile Corporation, trade name “EXXELOR PO-1015”) was charged in advance from the charging port 13a and heated to 300 ° C. to prepare a heated melt 13b. The glass strand 11 was conveyed into the heated melt 13b by being picked up by the picking machine 15 at a speed of 10 m / min. As a result, the glass strand 11 was impregnated with the polypropylene resin material. The nozzle diameter at the outlet of the impregnation device 13 is 2.2 mm. The number of tension bars in the impregnation device 13 is three.

Next, the glass strand 11 impregnated with the polypropylene resin material was conveyed to the cooling device 14. As a result, the polypropylene resin material impregnated in the glass strand 11 was solidified by water cooling. The glass strand 11 in which the impregnated polypropylene resin material was solidified was conveyed to the pelletizer 16 and cut to a predetermined length of 10 mm by a cutting roll 16a in which a plurality of cutting blades were radially arranged. As a result, pellet-shaped glass fiber-containing pellets were obtained. The content of the glass strands in the glass fiber-containing pellets was 50% by mass.

(Example 2)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Example 1 except that the diameter of the collet was changed to 200 mm.

(Example 3)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Example 1 except that the number of nozzles was 4000, the number of monofilaments was changed to 4000, and the count of glass strands was changed to 2400tex.

(Example 4)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Example 2 except that the number of nozzles was 4000, the number of monofilaments was changed to 4000, and the count of glass strands was changed to 2400tex.

(Example 5)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Example 1 except that the number of nozzles was 6000, the number of monofilaments was changed to 6000, and the count of glass strands was changed to 2400tex.

(Example 6)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Example 2 except that the number of nozzles was 6000, the number of monofilaments was changed to 6000, and the count of glass strands was changed to 2400tex.

(Example 7)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Example 6 except that the count of the glass strand was 1400 tex and the fiber diameter of the monofilament was changed to 10.5 μm.

(Example 8)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Example 6 except that the count of the glass strand was 600 tex and the fiber diameter of the monofilament was changed to 7 μm.

(Example 9)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Example 1 except that polyethylene oxide, which is an aqueous polymer, was used instead of the modified PP.

(Example 10)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Example 3 except that the count of the glass strand was set to 3600 tex and the fiber diameter of the monofilament was changed to 21 μm.

(Comparative Example 1)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Example 3 except that the diameter of the collet was changed to 100 mm.

(Comparative Example 2)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Comparative Example 1 except that the diameter of the collet was changed to 300 mm.

(Comparative Example 3)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Comparative Example 1 except that the number of nozzles was set to 6000 and the number of monofilaments was changed to 6000.

(Comparative Example 4)
Glass roving and glass fiber-containing pellets were obtained in the same manner as in Comparative Example 2 except that the number of nozzles was set to 6000 and the number of monofilaments was changed to 6000.

[Evaluation]
The following evaluations were carried out using the glass rovings or glass fiber-containing pellets obtained in Examples 1 to 10 and Comparative Examples 1 to 4.

[even]
In the even test, the glass strands drawn from the glass rovings obtained in Examples 1-10 and Comparative Examples 1-4 were cut. Subsequently, the amount of sagging was measured by the method described above. The results are shown in Tables 1 and 2 below.

[Tensile strength]
The pellet-shaped glass fiber-containing pellets obtained in Examples 1 to 10 and Comparative Examples 1 to 4 and a polypropylene resin material (manufactured by Exxon Mobile Corporation, trade name "EXXELOR PO-1015") are kneaded and kneaded at 260 ° C. A glass fiber reinforced composite resin material was obtained by injection molding in. The polypropylene resin material was added so that the content of the glass strands in the obtained glass fiber reinforced composite resin material was 30% by mass. The tensile strength of the glass fiber reinforced composite resin material was measured by a tensile tester manufactured by Instron. The tensile strength of the glass fiber reinforced composite resin material was measured according to ASTM D638 by preparing a tensile test piece and using the prepared tensile test piece. The results are shown in Tables 1 and 2 below.

[Disconnection evaluation]
The disconnection evaluation was performed using the glass rovings obtained in Examples 1 to 10 and Comparative Examples 1 to 4. In the disconnection evaluation, the above-mentioned glass fiber reinforced composite resin material was used except that the nozzle diameter at the outlet of the impregnation device 13 was changed from 2.2 mm to 2.0 mm and the number of tension bars was changed from 3 to 6. The production line was operated in the same manner as the production method of. After the operation, the time until the disconnection occurred at the nozzle at the outlet of the impregnation device 13 was measured. The results are shown in Tables 1 and 2 below.

As is clear from Table 1, when the amount of sagging was 40 mm or less, the time until the glass strand was broken was 550 seconds or more, and the glass strand was less broken when the glass fiber-containing pellets were produced.

10 ... Glass roving 11 ... Glass strand 11a ... Monofilament 12 ... Disintegration device 12a ... Tension bar 13 ... Impregnation device 13a ... Input port 13b ... Heated melt 14 ... Cooling device 15 ... Pick-up machine 16 ... Glass fiber-containing pellets 21a, 21b ... Support member

Claims (4)

It is a glass roving made by winding glass strands.
The glass strand comprises 1900 to 10000 monofilaments and a coating covering the surface of the monofilaments.
The fiber diameter of the monofilament is in the range of 6 to 10.5 μm.
The count of the glass strand is in the range of 600 to 1400 tex.
The inner diameter of the glass roving is in the range of 140 to 250 mm.
Monofilaments are obtained by defibrating the glass strands in a state where both ends of the glass strands having a length of 2 m or more arbitrarily cut from the glass roving are fixed by support members arranged 2 m apart in the horizontal direction. Glass roving in which the maximum value of the amount of sagging of the defibrated monofilament with respect to the straight line connecting the fixed positions of the glass strands when the glass strands are formed is 40 mm or less. The glass roving according to claim 1, wherein the coating film is made of a thermoplastic resin or a thermosetting resin. The method for producing glass roving according to claim 1 or 2.
The process of cooling the molten glass drawn from the bushing to form multiple monofilaments,
A step of forming the glass strand by applying a sizing agent to the surface of the plurality of monofilaments and squeezing the plurality of monofilaments.
A step of winding the glass strand around a collet having a diameter in the range of 140 to 250 mm to prepare a wound body.
A method for producing glass roving, which comprises a step of drying the sizing agent and forming the coating film on the surface of the monofilament constituting the winding body. A glass fiber reinforced composite resin material containing the glass strand constituting the glass roving according to claim 1 or 2 and a thermoplastic resin or a thermosetting resin.

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