JP2012161960A - Method of producing glass fiber reinforced plastic and glass fiber reinforced plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for efficiently and surely producing a glass fiber reinforced plastic having excellent electric insulation by surely performing the detection of conductive foreign matter contained in a glass roving.SOLUTION: There is provided a method of producing the glass fiber reinforced plastic using the glass roving 2, wherein the glass roving 2 is formed by winding roll-like a strand 1 comprising a plurality of glass filaments. The method comprises an unwinding step of unwinding the strand 1 from the glass roving 2, a passing step of passing the unwound strand 1 through a detector 10, a detecting step of detecting the foreign matter contained in the strand 1 based on a signal of the detector 10, a removing step of selectively removing the strand 1 containing the foreign matter, an impregnating step impregnating the strand 1 passed through the removing step with a resin, and a molding step of molding the strand 1 which has been impregnated with resin.

Description

  The present invention relates to a method for producing glass fiber reinforced plastic using glass roving, and a glass fiber reinforced plastic obtained by executing the production method.

  Glass fiber is used in various situations as a reinforcing material in composite materials. Examples of the matrix (base material) to be reinforced by glass fibers include thermosetting resins, thermoplastic resins, rubber, gypsum, cement, and the like. Among these, glass fiber reinforced plastic (FRP) in which thermosetting resin or thermoplastic resin and glass fiber are combined is a field that requires high electrical insulation such as connectors, insulators, and rods for electronic components. In recent years, the use has increased.

  The glass fiber is shipped in the form of a wound body such as glass roving. Here, a general manufacturing process of glass roving will be described. First, molten glass as a raw material is spun from a bushing (molding machine) equipped with a number of nozzles. A glass monofilament obtained by spinning is coated with a sizing agent, then bundled together to form a strand, wound into a roll, and then dried to obtain direct roving (DWR).

  Here, in the manufacturing process of the above-mentioned glass roving, a foreign matter (particularly conductive foreign matter) rarely adheres to the surface of the glass fiber (glass monofilament) or is mixed into the glass fiber. Examples of the conductive foreign material include a metal and a low melting point metal compound. The low melting point metal compound is a metal compound having a melting point lower than the glass spinning temperature (about 1200 ° C.). The foreign material can be mixed in the middle of transporting the glass raw material, for example. When a stainless steel container is used for transporting the glass raw material, fine stainless steel powder may be mixed into the glass raw material due to wear. Stainless steel mixed in the glass raw material can react with the sulfur content present in the glass raw material in the glass melting step. As a result, a nickel sulfide compound (melting point: about 976 ° C.), which is a low melting point metal compound, may be generated. Since the nickel sulfide compound has higher conductivity than the glass material, if it is mixed in the glass fiber in the form of so-called metal fiber or the like even in a trace amount, the electrical insulation property of the glass fiber is lowered. The electrical insulation property of the glass fiber reinforced plastic using glass fiber is also lowered. Thus, in order to maintain the performance of the glass fiber reinforced plastic, it is necessary to detect a small amount of conductive foreign matter mixed in the glass fiber and take some measures.

  Conventionally, as a technique for detecting conductive foreign matter mixed in glass fiber, glass fiber is passed through a detector that generates microwaves, and whether or not conductive foreign matter is contained in the glass fiber from the change in its waveform. A determination method is known (see, for example, Patent Document 1 and Patent Document 2).

  According to Patent Document 1, slit-like through holes are provided in a waveguide through which microwaves are transmitted, and glass fibers in the form of woven fabric are passed through the through holes. At this time, the glass fiber is detected by detecting the phase difference between the transmission wave transmitted from the microwave transmitter and the reception wave received through the glass fiber and the reflected wave reflected on the surface of the glass fiber. It is described that the contained conductive foreign matter can be detected (claims 1 and 2).

  According to Patent Document 2, a plurality of waveguides through which microwaves are transmitted are provided, and glass fibers in the form of woven fabric are passed through slit-like through holes provided in each waveguide. At that time, microwaves whose traveling directions are opposite to each other and whose phases are shifted from each other are transmitted from the microwave transmitter to the waveguide, and the reflected wave reflected on the surface of the glass fiber is detected. The measurement principle is substantially the same as in Patent Document 1, but it is described that high detection performance can be obtained by providing two systems of detection circuits and transmitting microwaves with shifted phases (paragraph 0021). .

Japanese Patent Laid-Open No. 60-20138 JP-A-10-185839

  By the way, a filament winding (FW) molding method and a pultrusion molding method are known as molding methods of glass fiber reinforced plastic. In the filament winding molding method, a glass roving (strand) is directly impregnated with resin, wound while applying tension to a rotating mandrel, cured, and then the mandrel is released to obtain a tubular molded body. Is the law. In the pultrusion method, a resin is directly impregnated into a glass roving, this is introduced into a mold having a predetermined cross-sectional shape, the resin is cured, and the mold is drawn continuously or intermittently by a drawing apparatus. It is a shaping | molding method which obtains the elongate molded object which has the same cross section as this cross-sectional shape. The glass fiber reinforced plastic produced by these molding methods uses glass roving which is a string-like glass fiber as a reinforcing material.

  In the filament winding molding method or the pultrusion molding method, it is necessary to prevent a conductive foreign matter such as a nickel sulfide compound as a low melting point metal compound from being mixed into the glass roving as a reinforcing material. In order to know the presence or absence of conductive foreign matter, the microwave inspection described in Patent Document 1 and Patent Document 2 described above is effective. However, the conductive foreign matter detection devices described in Patent Document 1 and Patent Document 2 basically have a planar glass fiber in the form of a woven fabric as an inspection target. For this reason, when manufacturing a glass fiber reinforced plastic by a filament winding molding method or a pultrusion molding method, the detection device described in Patent Document 1 or Patent Document 2 should be used as it is when inspecting glass roving. It is difficult. In patent document 1 and patent document 2, since application to the filament winding molding method and the pultrusion molding method is not assumed, nothing is suggested regarding the production of fiber reinforced plastic using glass roving.

  Thus, at present, a technology for reliably producing glass fiber reinforced plastic using high-quality glass roving has been developed by incorporating conductive foreign matter inspection of glass roving into the manufacturing process of glass fiber reinforced plastic. Not. The present invention has been made in view of the above problems, and in a method for producing glass fiber reinforced plastic using glass roving represented by a filament winding molding method and a pultrusion molding method, conductivity that can be included in glass roving. An object of the present invention is to provide a technology for efficiently and surely producing a glass fiber reinforced plastic having excellent electrical insulation that can be used for, for example, a connector of an electronic component, a high-voltage steel pipe, etc., by reliably detecting foreign matter. And

The characteristic configuration of the method for producing a glass fiber reinforced plastic according to the present invention for solving the above problems is as follows.
A method for producing glass fiber reinforced plastic using glass roving,
The glass roving is obtained by winding a strand made of a plurality of glass filaments into a roll shape,
Unwinding step of unwinding the strand from the glass roving;
A passing step of passing the unwound strand through the detector;
A detection step of detecting foreign matter contained in the strand based on the signal of the detector;
A removal step of selectively removing strands containing foreign matter;
An impregnation step of impregnating a resin into the strand that has undergone the removal step;
A molding step of molding the strand after resin impregnation;
It is to include.

As described in the above problem, the conventional technique for inspecting a glass fiber for foreign matter has been to use a flat glass fiber in the form of a woven cloth as an inspection object. For this reason, in the production of glass fiber reinforced plastic using glass roving as a reinforcing material, it is practically impossible to divert the prior art as it is.
In this regard, the glass fiber reinforced plastic manufacturing method of this configuration uses glass roving as a reinforcing material in the glass fiber reinforced plastic, and unwinding the strand from the glass roving, A passing step for passing through the detector and a detecting step for detecting foreign matter contained in the strand based on the signal of the detector are performed. That is, the strand foreign matter inspection is incorporated into the glass fiber reinforced plastic manufacturing process. And when the foreign material is contained in the strand, the removal process which removes the said strand selectively is performed. If these series of steps are executed, followed by the impregnation step and the molding step, for example, a filament-winding molding method or a pultrusion molding method can efficiently and reliably produce a glass fiber reinforced plastic excellent in electrical insulation. It can be manufactured.

In the method for producing a glass fiber reinforced plastic of the present invention,
It is preferable to further execute a re-molding step in which the molded product obtained by the molding step is heated and softened again.

  In the present invention, a thermosetting resin is mainly used as the glass fiber reinforced plastic base material, but a thermoplastic resin can also be used. For example, when re-molding from a cut product, a thermoplastic resin can be used as the resin. When a glass long fiber reinforced plastic (LFTP pellet) made of a thermoplastic resin and strands cut to a length of about 5 to 30 mm is heated, the thermoplastic resin softens and exhibits a certain degree of fluidity. When the fluid is injected into the mold in this state (re-molding step), a target molded body (re-molded product) is obtained. Thus, in the glass fiber reinforced plastic using glass roving, it is also possible to use a thermoplastic resin as a base material.

In the method for producing a glass fiber reinforced plastic of the present invention,
As the removal step,
A stopping step of stopping the movement of the strand;
An excision step of excising at least a portion where foreign matter is detected in the strand;
A yarn joining step of joining the strands separated by the cutting step;
A resuming step of resuming the movement of the strand;
Is preferably performed.

  According to the manufacturing method of the glass fiber reinforced plastic of the present configuration, when removing the strand containing the foreign matter, a stopping step of stopping the movement of the strand, an excision step of excising at least a portion where the foreign matter is detected in the strand, By executing the yarn joining step for joining the strands separated by the cutting step and the resuming step for resuming the movement of the strand, only the problematic strand portion can be surely removed. As a result, it is possible to produce a high-quality glass fiber reinforced plastic having excellent electrical insulation.

In the method for producing a glass fiber reinforced plastic of the present invention,
In the unwinding step, a plurality of the glass rovings are arranged,
In the passing step, it is preferable that a plurality of detectors are provided according to the number of the glass rovings, and each strand unwound from the glass roving is individually passed through the corresponding detector.

  According to the glass fiber reinforced plastic manufacturing method of this configuration, when performing the foreign substance inspection of the strands, the strands unwound from the plurality of glass rovings are individually passed through the corresponding detectors. The strand can be identified and removed. This method not only has excellent inspection accuracy, but also can minimize the number of strand parts to be removed, thereby improving the product yield.

In the method for producing a glass fiber reinforced plastic of the present invention,
In the unwinding step, a plurality of the glass rovings are arranged,
In the passing step, it is preferable that the strands unwound from the glass roving are arranged in a line and passed through the detector in a group.

  According to the manufacturing method of the glass fiber reinforced plastic of this configuration, when performing the foreign substance inspection of the strands, the strands unraveled from the plurality of glass rovings are arranged in a row and passed through the detector in a group. Can be simplified. In this method, it is not possible to individually identify strands containing foreign substances, but by removing all of the regions where the detector has reacted, foreign substances can be prevented from being mixed into the product without much effort.

In the method for producing a glass fiber reinforced plastic of the present invention,
A first columnar member and a second columnar member having a diameter of 10 mm are arranged at an interval of 10 mm in the horizontal direction, and 250 mm apart from the intermediate point between the first columnar member and the second columnar member in the vertical direction. A third cylindrical member having a diameter of 10 mm is placed at the position,
Occurs when the first cylindrical member, the third cylindrical member, and the second cylindrical member are advanced while contacting the strand having a total length of 5000 m at a speed of 300 mm / min with the order of description. It is preferable to use glass roving having a fluff weight of 15 mg or less.

  According to the glass fiber reinforced plastic manufacturing method of this configuration, since the glass fiber reinforced plastic is manufactured using the glass roving having a fuzz weight of 15 mg or less generated under the predetermined conditions, the fluff is detected in the detection process. There is no accumulation or clogging. Therefore, it is possible to continue the production of the glass fiber reinforced plastic stably without causing erroneous detection of foreign matter and failure of the apparatus. The manufactured glass fiber reinforced plastic becomes a high-quality product excellent in electrical insulation.

The characteristic configuration of the glass fiber reinforced plastic according to the present invention for solving the above problems is as follows.
The glass fiber reinforced plastic is obtained by executing the method for producing a glass fiber reinforced plastic according to any one of the above, and the content of the nickel sulfide compound is 5 ppm or less in terms of nickel.

  The glass fiber reinforced plastic of this structure is manufactured by executing the method for manufacturing a glass fiber reinforced plastic of the present invention, and the content of the nickel sulfide compound which is a low melting point metal compound is 5 ppm or less in terms of nickel. Become. Thus, since the content of the conductive foreign matter is extremely reduced, it is possible to provide a high-quality glass fiber reinforced plastic excellent in electrical insulation.

FIG. 1 is a schematic view showing a production facility for producing glass fiber reinforced plastic. FIG. 2 is a flowchart showing each process when manufacturing a glass fiber reinforced plastic. FIG. 3 is a schematic view showing a state in which foreign matter detection is performed by passing a strand unwound from glass roving through a detector. FIG. 4 is a schematic view of an apparatus for measuring the amount of fluff generation in glass roving.

  Hereinafter, an embodiment relating to a glass fiber reinforced plastic of the present invention and a manufacturing method thereof will be described with reference to FIGS. However, the present invention is not intended to be limited to the configurations described in the embodiments and drawings described below.

  FIG. 1 is a schematic view showing a production facility 100 for producing glass fiber reinforced plastic by a filament winding molding method. The manufacturing facility 100 mainly includes a detector 10, a resin impregnation tank 20, a resin adjustment unit 30, and a mandrel 40. FIG. 2 is a flowchart showing each process when manufacturing a glass fiber reinforced plastic. Hereafter, the manufacturing process of glass fiber reinforced plastic is demonstrated, referring FIG.1 and FIG.2.

  First, a glass roving 2 in which a strand 1 made of a plurality of glass filaments is wound in a roll shape is prepared as a glass fiber serving as a reinforcing material. The glass roving 2 is placed in a predetermined rack (not shown), and the strand 1 is unwound from the glass roving 2 (S1; unwinding step). Although FIG. 1 shows a state where only one glass roving 2 is arranged, a plurality of glass rovings 2 may be arranged side by side. Care should be taken not to raise the glass roving 2 during the unwinding process. The lifting of the glass roving 2 means that the strand 1 is unwound simultaneously from two or more layers from the glass roving 2, and as a result, the strand 1 is unwound in a state of being rolled. The lifting of the glass roving 2 can cause false detection or failure. In order to prevent the glass roving 2 from being lifted, it is effective to provide a guide member 50 through which the strand 1 is passed with a distance of 10 cm or more, preferably 15 cm or more from the surface of the glass roving 2. In the present embodiment, as the guide member 50, a first guide member 51 for preventing the glass roving 2 from being lifted up and a second guide member 52 for preventing the strand 1 from drooping and proceeding stably are provided. ing. The number and location of the guide members 50 can be changed as appropriate according to the manufacturing conditions.

  When the strand 1 is unwound from the glass roving 2, the strand 1 is passed through the first guide member 51 and further passed through the detector 10 (S2; passing step). The detector 10 is a device for detecting a conductive foreign substance (the above-described low melting point metal compound) contained in the strand 1, and is a microwave generator composed of a microwave transmitter 10a and a receiver 10b. is there. Note that the detector 10 may employ a device that performs measurement based on a principle other than microwaves.

  The detector 10 is connected to an analysis / control computer 60, and a signal is transmitted from the detector 10 to the computer 60 during operation of the manufacturing apparatus 100. The computer 60 determines whether or not the conductive foreign matter is included in the strand 1 based on the signal from the detector 10 (S3; detection step). For example, when the waveform of the microwave transmitted from the transmitter 10a of the detector 10 is compared with the waveform received by the receiver 10b, and there is a deviation in the phase of both, the strand 1 contains conductive foreign matter. It is determined that (S3; present).

  When the conductive foreign matter is detected, a removal step of selectively removing the strand 1 containing the foreign matter is performed. A removal process is performed by the following processes S11-S14. First, the movement of the strand 1 is stopped (S11; stop process). This is executed by stopping the motor 70 that rotationally drives the mandrel 40. The motor 70 is controlled by the computer 60, and when the computer 60 receives a “conducting foreign matter” signal from the detector 10, a stop command is immediately transmitted from the computer 60 to the motor 70. After the strand 1 is completely stopped, at least a portion of the strand 1 where a foreign object is detected is excised (S12; excision step). The strand 1 is cut, for example, between the two arrows shown in FIG. 1 (between immediately after the detector 10 and immediately before the resin impregnation tank 20). If the strand 1 is excised within this range, the strand 1 containing the conductive foreign matter can be surely removed. When the cutting of the strand 1 is completed, the separated strands 1 are joined together (S13; yarn joining step). The yarn splicing step may be performed manually by an operator, but an air splicer (not shown) that connects yarns while tangling yarns by air injection can be used. When the yarn joining step is completed, the movement of the strand 1 is resumed (S14; restarting step). Thus, only the problematic strand part can be reliably removed by performing the removing step.

  When manufacturing a glass fiber reinforced plastic using a plurality of glass rovings 2, a plurality of detectors 10 are provided according to the number of glass rovings 2 in the passing step, and the strands unwound from the glass rovings 2. 1 can be individually passed through the corresponding detector 10. In the example of FIG. 3A, five glass rovings 2 are provided, and the strand 1 unwound from each glass roving 2 is passed through individual detectors 10. In this case, it is possible to specify which strand contains the foreign matter and remove only the strand containing the foreign matter. This method not only has excellent inspection accuracy, but also can minimize the number of strand parts to be removed, thereby improving the product yield. On the other hand, the strands 1 unwound from the glass roving 2 may be arranged in a line and passed through a single detector 10 in a group. In the example of FIG. 3B, five glass rovings 2 are provided, and the strand 1 unwound from each glass roving 2 is passed through a common detector 10. In this case, since only one detector 10 needs to be installed, the apparatus configuration can be simplified. In this method, it is impossible to individually identify the strands 1 containing foreign substances, but by removing all the regions where the detector 10 has reacted (strands actually containing foreign substances and strands parallel thereto). Therefore, it is possible to prevent foreign matters from being mixed into the product without much trouble. In FIG. 3, for ease of explanation, each strand 1 unwound from each glass roving 2 is shown as being passed through the first guide member 51 on the side. In practice, the first guide member 51 is disposed immediately above the glass roving 2 in order to prevent fluffing.

  After the removal step (S11 to S14) is completed or when it is determined in the detection step that the conductive foreign matter is not contained in the strand 1 (S3; none), the strand 1 is impregnated with a resin (S4; Impregnation step). The impregnation step is performed by allowing the strand 1 to be hidden in the resin impregnation tank 20 in which the resin is stored. The resin impregnated in the strand 1 is selected appropriately depending on the type of glass fiber reinforced plastic to be produced. For example, when producing a molded body by the filament winding molding method illustrated in FIG. 1 or a molded body by the pultrusion molding method, a thermosetting resin is used. Examples of thermosetting resins include epoxy resins, phenol resins, melamine resins, urea resins, urethane resins, amino resins, unsaturated polyester resins, and the like. Among these, an epoxy resin is suitably used as an application for producing an electrically insulating molded body. On the other hand, the strand 1 can be impregnated with a thermoplastic resin to produce a molded body made of long glass fiber reinforced plastic (LFTP). Examples of the thermoplastic resin include polypropylene, polystyrene, polyvinyl acetate, acrylic resin, polyamide, polyacetal, polycarbonate, polyethylene terephthalate, polyphenylene sulfide, polyether sulfone, polyphenylene ether, liquid crystal polymer, and the like. The strand 1 that has been subjected to the impregnation step is adjusted by the resin adjusting unit 30 so that the resin adhering to the surface of the strand 1 becomes an appropriate amount. A through hole 31 that is slightly larger than the diameter of the strand 1 is provided in the resin adjusting portion 30, and excess resin is scraped off from the surface of the strand 1 by passing the strand 1 containing resin through the through hole 31. .

  The strand 1 whose resin amount has been adjusted is wound while applying tension to the mandrel 40 rotating by the motor 70. Winding is performed at a rotational speed at which the traveling speed of the strand 1 is 10 to 30 m / min. When the winding around the mandrel 40 is completed, the mandrel 40 is heated in this state, and the resin impregnated in the strand 1 is cured. When the resin reaches a sufficient hardness, the inner mandrel 40 is extracted and the molding is completed (S5; molding process). The glass fiber reinforced plastic thus obtained becomes a tubular molded body. Since this tubular molded body does not contain conductive foreign substances, it has excellent electrical insulation, and can be used as, for example, a high-voltage steel tube.

  Incidentally, when manufacturing the molded object which consists of a glass long fiber reinforced plastic (LFTP), the shaping | molding process is performed again after the said shaping | molding process. In the case of long glass fiber reinforced plastic (LFTP), a strand impregnated with a thermoplastic resin is not wound around a mandrel but is cut into a predetermined length (about 5 to 30 mm). Therefore, this cutting is the molding step (S5), and the cut product is a molded product. By heating the cut product (molded product) obtained by the molding process and softening it, a molded body made of glass long fiber reinforced plastic (LFTP) (for example, LFTP) (for example, remolding process) Electronic component connectors etc.) are completed.

  As the glass roving 2 (strand 1) used in the present invention, it is preferable to use one having a small amount of fluff generation. The amount of fluff generation can be measured by the following procedure. FIG. 4 is a schematic view of an apparatus for measuring the amount of fluff generation in the glass roving 2. A first columnar member 11 and a second columnar member 12 both having a diameter of 10 mm are arranged at an interval of 10 mm in the horizontal direction. Further, a third cylindrical member 13 having a diameter of 10 mm is disposed at a position 250 mm away from the midpoint between the first cylindrical member 11 and the second cylindrical member 12 in the vertical direction. In this state, the first cylindrical member 11, the third cylindrical member 13, and the second cylindrical member 12 are advanced while contacting the strand 1 having a total length of 5000 m at a speed of 300 mm / min. The weight of the fluff generated at this time is the amount of fluff generated by the glass roving 2. The fluff generation amount of the glass roving 2 used in the present invention is 15 mg or less. In this case, fuzz does not collect or clog in the detector 10 in the detection process. Therefore, it is possible to continue the production of the glass fiber reinforced plastic stably without causing erroneous detection of foreign matter and failure of the apparatus. The manufactured glass fiber reinforced plastic becomes a high-quality product excellent in electrical insulation. The preferred fluff generation amount is 10 mg or less, more preferably 5 mg or less, and most preferably 1 mg or less. When the glass roving 2 is produced, the amount of fluff is changed by changing the type of sizing agent (including bundling agent, lubricant, etc.) applied to the strand 1 before being wound into a roll, or by the amount of sizing agent applied. It is possible to control to some extent by adjusting.

  As described above, in the present invention, strand foreign matter inspection is incorporated in the manufacturing process of glass fiber reinforced plastic. And when the foreign material is contained in the strand, the removal process which removes the said strand selectively is performed. If a series of steps of the present invention are executed and the impregnation step and the forming step are executed for the strand that has passed the inspection, a high-quality glass fiber reinforced plastic can be efficiently and reliably obtained by a filament winding forming method or a pultrusion forming method. It can be manufactured. The glass fiber reinforced plastic produced according to the present invention is excellent in electrical insulation because the content of the nickel sulfide compound is 5 ppm or less in terms of nickel.

  Next, the Example regarding the glass fiber reinforced plastic manufactured by the manufacturing method of the glass fiber reinforced plastic of this invention is described.

  48 rolls of glass roving (1150 tex) having a fluff generation amount of 5 mg surface-treated with a sizing agent for epoxy resin were placed on a dedicated rack, and the first guide member was placed at a height of 15 cm above the glass roving. The strands unwound from each glass roving were arranged in a line, and each strand was passed through a detector (microwave generator) provided with a waveguide having slit-shaped passage holes. At that time, the strand was allowed to travel substantially perpendicular to the passage hole of the waveguide so that a strong microwave hit the strand. When the detector detected a conductive foreign matter, the portion of the strand was removed by the removal process of the present invention. A strand that passed the inspection was impregnated with an epoxy resin, and a glass fiber-reinforced plastic tubular molded body (maximum inner diameter 1 m, length 9 m) was produced by a filament winding molding method.

  This glass fiber reinforced plastic tubular molded body was used as a high-voltage steel tube, and a conductive breakdown test was performed. In the inspection, a high voltage of 1 million volts was applied to the high voltage soot tube. As a result, the high voltage soot tube did not cause electrical breakdown, and no abnormality was observed.

  The glass fiber reinforced plastic obtained by the method for producing glass fiber reinforced plastic of the present invention is used for electronic parts in addition to products that require high electrical insulation, such as connectors for electronic parts, high voltage insulators, insulators, and rods. It can be used for packages, FRP structural materials, and the like.

DESCRIPTION OF SYMBOLS 1 Strand 2 Glass roving 10 Detector 11 1st column member 12 2nd column member 13 3rd column member 20 Resin impregnation tank 30 Resin adjustment part 40 Mandrel 50 Guide member 51 1st guide member 52 2nd guide member 60 Computer 70 Motor 100 production equipment

Claims (7)

A method for producing glass fiber reinforced plastic using glass roving,
The glass roving is obtained by winding a strand made of a plurality of glass filaments into a roll shape,
Unwinding step of unwinding the strand from the glass roving;
A passing step of passing the unwound strand through the detector;
A detection step of detecting foreign matter contained in the strand based on the signal of the detector;
A removal step of selectively removing strands containing foreign matter;
An impregnation step of impregnating a resin into the strand that has undergone the removal step;
A molding step of molding the strand after resin impregnation;
A method for producing a glass fiber reinforced plastic.   The manufacturing method of the glass fiber reinforced plastics of Claim 1 which further performs the re-molding process which shape | molds again in the state heated and softened the molded article obtained by the said shaping | molding process. As the removal step,
A stopping step of stopping the movement of the strand;
An excision step of excising at least a portion where foreign matter is detected in the strand;
A yarn joining step of joining the strands separated by the cutting step;
A resuming step of resuming the movement of the strand;
The manufacturing method of the glass fiber reinforced plastics of Claim 1 or 2 performed. In the unwinding step, a plurality of the glass rovings are arranged,
The said passage process WHEREIN: A some detector is provided according to the number of the said glass roving, Each strand unwound from the said glass roving is individually passed to a corresponding detector. The manufacturing method of glass fiber reinforced plastics as described in 2. In the unwinding step, a plurality of the glass rovings are arranged,
The method for producing glass fiber reinforced plastic according to any one of claims 1 to 3, wherein in the passing step, the strands unwound from the glass roving are arranged in a line and passed through the detector in a group. A first columnar member and a second columnar member having a diameter of 10 mm are arranged at an interval of 10 mm in the horizontal direction, and 250 mm apart from the intermediate point between the first columnar member and the second columnar member in the vertical direction. A third cylindrical member having a diameter of 10 mm is placed at the position,
Occurs when the first cylindrical member, the third cylindrical member, and the second cylindrical member are advanced while contacting the strand having a total length of 5000 m at a speed of 300 mm / min with the order of description. The manufacturing method of the glass fiber reinforced plastic as described in any one of Claims 1-5 using the glass roving whose weight of fuzz is 15 mg or less.   A glass fiber reinforced plastic having a nickel sulfide compound content of 5 ppm or less in terms of nickel, obtained by executing the method for producing a glass fiber reinforced plastic according to any one of claims 1 to 6.

Images