JP2003251589A - Glass fiber strand cutting device, and sheet molding compound manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass fiber strand cutting device which can continuously manufacture short glass fiber of the length of ≤1/2 inch, prevent the short glass fiber from being stuffed between cutting blades, and be built in the SMC manufacture line for use. <P>SOLUTION: The glass fiber strand cutting device has a cutting roll in which cutting blade rows having a plurality of cutting blades are formed on a surface of a cylinder and each cutting blade row is formed spiral, and a receiving roll which is disposed so as to be brought into contact with the cutting blades at a predetermined space, and the cutting roll is rotated, and the glass fiber strand is pressed by the cutting blades and the receiving roll and cut. The cutting roll with the length-diameter ratio (L/D) of 9 to 15 is fitted to the glass fiber strand cutting device, and short glass fiber of a length of ≤1/2 inch can continuously be manufactured with a cutting pitch length of ≥1/8 inch and ≤1/2 inch. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a glass fiber strand cutting device for continuously producing glass short fibers having a length of 1/8 inch or more and 1/2 inch or less, and a glass short fiber obtained thereby. The present invention relates to a method for producing an obtained sheet molding compound (hereinafter referred to as SMC).

[0002]

2. Description of the Related Art As a device for cutting glass fiber strands, a plurality of grooves are formed in the outer peripheral longitudinal direction of a cylindrical rotary member, and a cutting roll having a thin plate-shaped cutting blade provided upright in the grooves,
It is known that a cylindrical receiving roll having an outer periphery wound with an elastic material such as rubber is arranged in such a positional relationship that the tip of the cutting blade is slightly pressed against the surface of the receiving roll. Rotate both rolls with gears, etc., and make multiple bundles of glass fiber strands pass through the contacting parts of both rolls in parallel at this time to make glass fiber cut pieces corresponding to the length of the cutting blade attachment interval. It is a thing.

For example, the length of the cutting roll may be used as a cutting device for producing a short glass fiber having a cutting pitch of 1 inch or more by using a cutting roll having a cutting blade array formed in a spiral shape. The ratio of / diameter (L / D) is about 6 and the diameter is relatively large with respect to the length. When making a shorter glass cutting piece with this cutting roll diameter, it is necessary to shorten the mounting interval of the cutting blade, but in such a device, since the diameter of the cutting roll is particularly large, the cutting blade mounting arc also becomes large and after cutting There has been a problem that the glass cutting pieces are easily attached between the cutting blades and are difficult to be discharged.

When the rotation is further continued, these are clogged up to the tip of the cutting blade and the deposited glass pieces are compressed, so that the operation of the apparatus is impossible and must be stopped. Sheet molding compound (SMC) must be run again after removing the clogged glass pieces
In a manufacturing line such as a bulk molding compound (BMC) or the like, there has been a problem in the case where glass cut pieces are continuously and stably supplied onto the applied resin.

To solve this problem, for example, the one in which a sandwiching object is provided between the cutting blades is disclosed in Japanese Utility Model Laid-Open No. 57-125735. This pinch has a height slightly lower than the cutting blade, and is for the purpose of not cutting into the roll cylindrical surface between the cutting blades, but since there is practically no gap between the receiving rubber roll and the pinch, Since the glass pieces are strongly compressed at the time of cutting and fall as a lump, there is a problem that it is difficult to uniformly disperse the glass fibers on the resin.

Further, Japanese Patent Publication No. 57-16936 discloses an elastic wire attached between cutting blades. This wire is stretched in the direction of the length of the cutting roll, is bent during cutting, and pushes out the glass piece by the restoring force of the wire after cutting. However, since the structure becomes complicated and the restorability of the wire is deteriorated due to repeated use, constant maintenance and replacement of the wire are required, which is troublesome. Further, if the wire rod is cut by a cutting blade for some reason and the metal pieces are mixed in the resin layer, a serious problem will occur in the quality of the molded product, which is not preferable.

Therefore, when cutting into short fibers of 1 inch or less, a bundle of several glass strands is cut by another dedicated cutting device, and the cutting blade is twisted in parallel with the cutting roll axis. Moreover, the length / diameter (L / D) ratio of the cutting roll is as small as about 2. Since the width of the glass strand bundle that can be cut at one time is small and the dispersion of the glass pieces on the resin is large, it is a wide sheet S
It is impossible to continuously supply a large amount of short glass fibers by incorporating it into a production line such as MC or BMC. For this reason, in the SMC production line, there was only a method in which a glass cut piece made in advance was put into a kneader containing a resin and kneaded, and this resin was supplied onto a coating device of the SMC production line.

[0008]

DISCLOSURE OF THE INVENTION The present invention is capable of continuously producing short glass fibers having a length of 1/2 inch or less, and the cut short glass fibers are clogged between cutting blades. An object of the present invention is to provide a glass fiber strand cutting device which can be used by being incorporated into a SMC or BMC manufacturing line without the inconvenience of being discharged.

[0009]

According to the present invention, a plurality of cutting blade rows are formed on a cylindrical surface, and each cutting blade row is formed in a spiral shape. A length / diameter (L / D) in a device having a receiving roller arranged so as to come into contact with each other in quantity, and rotating a cutting roll to press the glass fiber strand into pressure contact with the cutting blade and the receiving roller. The present invention relates to a glass fiber strand cutting device, which is equipped with a cutting roll having a ratio of 9 to 15 and is capable of continuously producing short glass fibers having a glass cutting pitch length of 1/2 inch or less.

Further, according to the present invention, a liquid unsaturated resin composition is coated on one carrier film, and the unsaturated resin composition is supplied onto the unsaturated resin composition from the glass fiber strand cutting device according to any one of claims 1 to 6. After dispersing and depositing glass short fibers having a length of 1/8 inch or more and 1/2 inch or less, the other carrier film coated with the liquid unsaturated resin composition is applied to the unsaturated film of the carrier film. A method for producing SMC, which comprises laminating the resin composition so that the coated surfaces are in contact with each other, and a liquid unsaturated resin composition is applied onto the dispersed and deposited glass short fibers in the production method, The present invention relates to a method for producing a multi-layer or thick-walled SMC, which comprises dispersing and depositing other short glass fibers thereon.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to FIGS. FIG. 1 is a schematic plan view and side view (partially sectional view) of a device showing one embodiment of a glass fiber strand cutting device (hereinafter referred to as a cutting device) of the present invention, and FIG. 2 is a perspective schematic view of the cutting device, 3 is an enlarged schematic front view, and FIG. 4 is an SM showing a first embodiment of the cutting apparatus of the present invention.
C is a schematic configuration diagram of the manufacturing apparatus, FIG. 5 is a schematic configuration diagram of an SMC manufacturing apparatus showing a second embodiment of the cutting apparatus of the present invention, and FIG. 6 is a cross section of the SMC product manufactured in the second embodiment. is there. In each figure, the same reference numerals are used for the same functions. Each example is merely an example of the present invention and is not intended to be limiting.

1 to 6, A is a cutting device according to the present invention, 1 is a cutting roll, 2 is a cutting blade, 3 is an air nozzle, 4 is a receiving roll, 5 is rubber, 6 is a slip ring, and 8 is Brush, 9 supporter, 10 cutting roll gear, 11 receiving roll gear, 12 feed roll, 1
3 is a glass strand, 13a is a glass cutting piece, 14 is a glass roving device, 15 is a lower carrier film,
Reference numeral 16 is a lower resin coating device, 17 is a resin, 18 is an upper carrier film, 19 is a lower resin coating device, 20 is an impregnation device, 21 is an SMC winding device, and 22 is an intermediate layer resin coating device.

In FIG. 1, the cutting blade 2 is attached to the groove on the surface of the cutting roll 1 over substantially the length of the cutting roll. The groove to which the cutting blade is attached is twisted at a slight angle α ° with respect to the rotation axis of the cutting roll to be processed into a spiral shape. A plurality of air nozzles 3 are attached to an air supply pipe 4 connected to a compressed air source (not shown) on the lower discharge side of the cutting roll.

The surface of the receiving roll 5 is coated with a conductive rubber 6, and the generated static electricity comes into contact with the slip ring 7 provided on the rotating shaft from the roll body by the brush 8
To ground via the supporter 9. A feed roll 12 for feeding the glass strands 13 to the cutting roll is provided above the receiving roll.

In the cutting device constructed as described above, the glass strand 13 is fed to the cutting section by the feed roll 12 as shown in FIG. The cutting blade is higher than the surface of the cutting roll by about 1.0 mm to 2.5 mm, and is slightly pressed against the rubber 5 of the receiving roll for cutting.

When the bundle of glass strands 13 is used in the SMC production line, it is arranged so as to cover the entire surface of the sheet, but the ratio of the cutting roll length L to the cutting roll diameter D (L
/ D) is preferably 9 or more so that the cut pieces 13a are not clogged between the cutting blades and fall to the lower part, so that stable cutting can be performed even if the cutting roll bends due to cutting. Is preferably 15 or less. The cutting roll length L is
Since it is planned to be incorporated in the SMC manufacturing line, it is preferably about 800 to 1400 mm.

By halving the diameter of the cutting roll, for example, the angular velocity is doubled and the centrifugal force is increased, so that the glass cutting piece 13a easily falls from between the cutting blades 2.
Further, since the opening angle of the tip of the blade becomes large, it becomes easy to separate from the cutting blade. If the cutting pitch is 1/2 inch, the cutting roll diameter D is φ80 to φ130, and if it is 1/4 inch, it is φ70.
~ Φ110 place, 1/8 inch φ65 ~ φ100
The place is appropriate.

When the cutting blade 2 is mounted parallel to the axial center of the cutting roll 1, a cutting reaction force is applied to the roll shaft at the same time, resulting in a large impact and wear of the machine. In addition, since mechanical strength is required, it is difficult to use a small roll diameter, and the device itself becomes large. By twisting the attachment angle of the cutting blade with respect to the axis of the cutting roll 1 to form a spiral shape, the cutting reaction force is dispersed and leveled so that the impact is reduced and stable cutting can be performed. Twist angle α
The number of bundles of glass strands 13 and Tex per strand (the number of glass fibers per strand)
Although it depends on the above, 1.0 ° or more is preferable for leveling the cutting reaction force, and 10 ° or less is preferable in consideration of separation of the cutting piece 13a from the cutting blade after cutting.

The hardness of the rubber 6 coated on the surface of the receiving roll 5 is slightly depressed by being pressed by the cutting blade 2 and the glass strand 13, and the Shore A hardness is 70 ° for cutting.
The above is preferable, and 85 ° or less is preferable in order to maintain the surface recoverability by repeated pressing and to prevent cracking. Since the coated rubber has conductivity, static electricity generated by cutting the glass can be surely released to the ground by bringing the brush into contact with the slip ring attached to the rotating shaft. The electric resistance value of rubber is preferably 10 MΩ or less.

As shown in the enlarged front view of FIG. 3, when the diameter D1 of the receiving roll rubber 6 is made larger than the diameter D of the cutting roll 1, the arc of the rubber outer diameter becomes large, and the glass cutting piece 1
Since 3a is not strongly pressed between the cutting blades 2 during cutting, clogging after cutting can be prevented. The diameter ratio (D1 / D) of the receiving roll and the cutting roll is 1.5 or more in consideration of the fact that the function resulting from the difference in the arcs works.
Further, when considering the operation and adjustment work of the device, 3.0 or less is preferable, and about 2.0 is desirable.

A plurality of air nozzles 3 were provided in the lower portion of the cutting roll 1 on the outlet side over the length of the cutting roll. It does not fall after cutting and is sandwiched between the cutting blades 2 so that the adhered glass cutting pieces 13a can be peeled off. The air pressure is preferably about 0.2 MPa in consideration of dropping the glass cut pieces downward and not scattering them around. The effect can be enhanced by providing a static eliminating device on the nozzle and blowing it as static elimination air.

If the cylindrical surface of the cutting roll 1 is not smooth but has a rough surface, the contact area between the glass cutting piece 13a and the roll surface is smaller, so that the generation of static electricity is suppressed and the adhesive force of the glass piece is reduced. Therefore, the effect of removal by the air nozzle 3 can be enhanced. As a treatment method, a knurled mechanical finishing method, roughening by shot peening treatment, surface treatment method by satin plating, etc. may be used. The coarse size is preferably about 100 to 800 mesh, and the cutting pitch and the density of the glass strand (T
ex) may be appropriately determined.

In the cutting apparatus of the present invention, when the coating width of SMC is large and the number of bundles of glass strands 13 is large, the reaction force at the time of cutting becomes particularly large. Therefore, if the diameter D of the cutting roll 1 is small, bending may occur. The central part may escape, and a cutting failure may occur near the central part as compared to both ends.
Further, even if the diameter of the cutting roll is the same, if the cutting pitch length is small, the number of cuts per cutting circumferential surface increases, and the same problem occurs, and if the length of the roll is long, it is more affected. In order to prevent this and to make a uniform cut over the entire width, it is desirable to calculate the bending amount and make the center part of the roll into a crown shape having a middle height so that a uniform cutting force is applied to the glass strand.

To solve the above problem, either the cutting roll 1 or the receiving roll 5 forming a pair may be formed into a crown shape. However, a cutting roll having a large number of cutting blades 2 embedded in a groove requires time for processing and adjusting the height of the blade surface after processing. Therefore, it is desirable to polish the receiving roll into a crown shape. The amount of the crown (a diameter obtained by subtracting the diameter of the end portion from the diameter of the middle portion of each roll) is the length L and the diameter D of the cutting roll or the receiving roll, and the structure of the bearing support including the shaft portion. It may be determined as appropriate. The crown amount is preferably 0.3 to
It is about 8 mm. Normal coating width of SMC is 800-1
It is about 200 mm and the rubber roll diameter is 80 to 250.
Since it is about mm, the crown amount is more practically 0.5 to 5 mm with respect to the diameter of the roll.

The surface of the feed roll 12 for feeding the glass strands 13 is not smooth and is roughened. As a result, the glass bundle can be surely supplied in accordance with the rotation of the receiving roll 5 without slipping, and the generation of static electricity can be suppressed, so that the glass pieces are easily separated after cutting.

Thus, the cutting device A of the present invention continuously cuts the glass fiber strands to a length of 1 /
8 inch to 1/2 inch short glass fiber can be supplied.
It can be incorporated into the MC production line.

It becomes possible that it was conventionally difficult to continuously produce SMC containing short glass fibers of 1/2 inch or less by using the cutting apparatus of the present invention.

Further, even in the case of BMC which is conventionally produced by kneading short glass fibers with resin in advance and producing it in small block units by using an extruder or the like, if the cutting apparatus of the present invention is incorporated, it is possible to obtain a structure as shown in FIG.
A continuous manufacturing method with a configuration similar to that of the SMC manufacturing line shown in FIG. 3 is possible, and efficient production and a product with stable quality can be obtained.

FIG. 4 shows a first embodiment in which the cutting device A according to the present invention is incorporated in an SMC manufacturing line. The liquid unsaturated resin composition 17 fed from a resin tank (not shown) and stored in the lower resin coating device 16 is applied onto the lower carrier film 15 drawn out from the unwinding device through a doctor, and then upward. A plurality of bundles of glass strands 13 are sent from the roving device 14 arranged to the cutting device A, and the cut glass cutting pieces 13a are uniformly dispersed and deposited on the applied resin layer. In the next step, the resin in the upper resin coating device 19 is applied on the upper carrier film 18 through a doctor, the resins on the upper and lower carrier films are overlapped, and the glass cut pieces are layered with the defoaming / impregnating roll 20. Alternatively, it may be impregnated into a roll and wound into a roll by a winding device 21, or may be folded like a woven fabric by using a device (not shown). The liquid unsaturated resin composition applied to the upper and lower carrier films is preferably the same,
It may be different in some cases.

Since it is possible to uniformly disperse the glass of short fibers on the resin, which has been difficult in the prior art, even if the resin is thin-walled by a resin molding process in the subsequent step, it is possible to obtain uniform strength.
It is possible to obtain quality products. A known knife coater, die coater, bar coater or the like may be used as the resin coating device. The carrier film may be a commonly used thermoplastic resin film such as polyethylene or polypropylene, and a polyethylene terephthalate film is preferably used.

FIG. 5 is a second embodiment and shows a method of manufacturing a multi-layer or thick SMC by using three or more coating devices. That is, to clarify the difference from the manufacturing method shown in FIG. 4, is it the same as the liquid unsaturated resin composition applied to the upper and lower carrier films,
The intermediate layer resin composition 17 ′ composed of a liquid unsaturated resin composition which is different depending on the case is applied from the intermediate layer resin application device 22 and then from the glass short fiber supply device B installed on the downstream side thereof. It is an SMC production in which the same or different glass short fibers supplied to the above are dispersed and deposited. According to this manufacturing method, it is possible to continuously produce a multilayer SMC product having different wall thicknesses or different properties.
The short glass fiber supply device B may be a cutting device as shown in FIG. 1 or another cutting device, or may be a storage tank for precut short glass fibers. The short glass fiber supplied at this time is not particularly specified in length, but is about 1/32 to 1.5 inches, and 1/2 inch or more if high strength is desired. Is. Further, in FIG. 5, the cutting device A and the glass short fiber supplying device B may be interchanged to manufacture the SMC. In some cases, the cutting device A may be further installed after the glass short fiber supplying device B to form three layers. It is also possible to manufacture structured SMCs.

FIG. 6 shows the SM manufactured in the second embodiment.
It is a typical sectional view of a C product. For example, a resin composition 17 ′ that is hollow and lighter than the resin compositions 17 on both sides, that is, a liquid unsaturated resin composition containing a lightweight filler such as shirasu balloon is applied by the intermediate layer resin application device 22, Short glass fibers 13a having different lengths from the short glass fibers 13a
'Is dispersed on the resin for the intermediate layer, it is possible to produce an SMC product having different strength between the surface layer and the intermediate layer and having characteristics suitable for the molding purpose.

Since a carrier film cannot be used when applying the resin composition 17 'for the intermediate layer, a non-contact type curtain coater, a slit coater or the like may be used as the coating device 22.

The liquid unsaturated resin composition which is a raw material for producing SMC is preferably a liquid resin composition containing an unsaturated polyester resin or vinyl ester resin and a polymerizable monomer as main components.

As the unsaturated polyester resin,
It can be obtained from unsaturated polybasic acids or unsaturated polybasic acids, optionally including saturated polybasic acids, and polyhydric alcohols. Examples of unsaturated polybasic acids include fumaric acid, maleic acid, maleic anhydride, itaconic acid, and alkyl esters thereof. These unsaturated polybasic acids can be used individually by 1 type, or can also be used in combination of 2 or more type. Examples of the saturated polybasic acid that replaces part of the unsaturated polybasic acid include phthalic acid, phthalic anhydride, isophthalic acid,
Terephthalic acid, hettic acid, hexahydrophthalic anhydride,
Examples thereof include adipic acid, sebacic acid, azelaic acid and the like. These saturated polybasic acids can be used alone or in combination of two or more.

Examples of the polyhydric alcohol include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, trimethylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,2. 2-pentanediol, 1,6-hexanediol, cyclohexanediol, neopentyl glycol, 2,2,4-trimethyl-
1,3-pentanediol, glycerin monoallyl ether, hydrogenated bisphenol A, 2,2-bis (4-hydroxyethoxyphenyl) propane, 2,2-bis (4-
Examples thereof include diols such as hydroxypropoxyphenyl) propane; triols such as trimethylolpropane; tetraols such as pentaerythritol. These polyhydric alcohols can be used individually by 1 type, or can also be used in combination of 2 or more type.

As the vinyl ester resin, for example, bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin,
Examples thereof include novolac type epoxy resin and the like to which acrylic acid or methacrylic acid is added.

The unsaturated polyester resin and vinyl ester resin are usually used in a state of being dissolved in a liquid polymerizable monomer. As the liquid polymerizable monomer, (meth) acrylic acid ester or aromatic vinyl compound can be preferably used. Examples of the (meth) acrylic acid ester include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, and 2-ethylhexyl. (Meth) acrylate, diethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, etc. may be mentioned. Examples of the aromatic vinyl compound include styrene, α-methylstyrene,
Examples thereof include vinyltoluene, t-butylstyrene, α-chlorostyrene, dichlorostyrene, divinylbenzene and the like. Of these liquid polymerizable monomers, styrene can be particularly preferably used.

The liquid unsaturated resin composition includes calcium carbonate, magnesium carbonate, barium sulfate, mica, talc, kaolin, clay, celite, asbestos, barlite, baryta, silica, silica sand, dolomite limestone,
Gypsum, fine aluminum powder, alumina, glass powder, aluminum hydroxide, cryolite, zirconium oxide, antimony trioxide, titanium oxide, molybdenum dioxide, shirasu balloon, filler such as hollow resin particles; alkaline earth metal such as magnesium oxide Thickeners such as oxides and thermoplastic resin powders; t-butylperoxy-2-ethylhexanoate, benzoyl peroxide, lauroyl peroxide, disuccinic acid peroxide, t
-Curing catalysts such as butyl peroxyethyl hexanoate, decanoyl peroxide, 3,5,5-trimethylhexanoyl peroxide; higher fatty acids such as stearic acid, higher fatty acid salts such as zinc stearate and calcium stearate, Internal release agents such as alkyl phosphates and waxes; polystyrene, polyethylene, polymethyl methacrylate, polyvinyl chloride, polyvinyl acetate, polycaprolactam, saturated polyester, thermoplastic resins such as styrene-acrylonitrile copolymer, polybutadiene, A low-shrinking agent such as a rubber-like polymer such as polyisoprene, a styrene-butadiene copolymer and an acrylonitrile-butadiene copolymer; a coloring agent and the like can be added.

The SMC obtained by the present invention is useful as a molding material for housing parts such as automobile exterior parts, railcar interior and exterior parts, wall panels, unit baths, bathtubs and the like.

[0041]

(Example 1) SM using the cutting apparatus of the present invention
C was produced. In the SMC manufacturing line shown in FIG.
Using a cutting device under the following conditions, short glass fibers having a length of ½ inch were continuously blended in an amount of 25 parts by weight with respect to 100 parts by weight of the unsaturated polyester resin composition described below to prepare SMC. . The obtained SMC has a strength almost equal to that of the initial one, that is, 180 after being continuously manufactured for 1 month.
The bending strength was 0 kg / cm ² . Here, the various shapes and processing conditions of the cutting device are as follows. Length of cutting roll (L) 1200 mm, diameter of cutting roll (D) 95 mm, L / D ratio 12.6, rotation speed 150 rpm Mounting helix angle α of cutting blade α1.8 °, cutting pitch 1
1/2 inch, number of cutting blade rows 24, cutting roll surface treatment 200 mesh receiving roll diameter 200 mm, rubber hardness Shore A75
° Outer diameter ratio of receiving roll / cutting roll D1 / D 2.1
0 Electric resistance value of receiving roll 4 MΩ The applied resin is an unsaturated polyester resin composition, and Polylite MPS-52 manufactured by Dainippon Ink and Chemicals, Inc.
It is 0. The viscosity is 150 mPa · s, and the sheet resin application width is 1000 mm.

(Example 2) In place of the following various shapes and processing conditions of the cutting device in Example 1, other conditions were carried out in the same manner as in Example 1. Cutting pitch of cutting roll 1/4 inch, number of cutting blade rows of cutting roll 48 amount of receiving roll crown 1.6 mm (outer diameter of central part −
Outer diameter of the end) Outer diameter of the central part of the receiving roll 201.6mm Even though the cutting resistance is large, by attaching a crown, it is possible to obtain a uniform glass cut from both ends to the central part. did it.

[0043]

As described above in detail, according to the cutting apparatus of the present invention, it is possible to continuously cut a glass having a short pitch without clogging of the glass pieces between the cutting blades. Compared with a cutting device, it is possible to obtain glass pieces of high quality with good efficiency. By equipping the SMC or BMC production line with this cutting device,
High-quality continuous production is possible and greater effect is demonstrated.

[Brief description of drawings]

FIG. 1 is a schematic plan view and side view (partially sectional view) of a device showing an embodiment of a cutting device of the present invention.

FIG. 2 is a schematic perspective view of a cutting device of the present invention.

FIG. 3 is an enlarged schematic front view of the cutting device of the present invention.

FIG. 4 is a schematic configuration diagram of an SMC manufacturing line showing a first embodiment incorporating a cutting device of the present invention.

FIG. 5 is a schematic configuration diagram of an SMC manufacturing line showing a second embodiment incorporating the cutting apparatus of the present invention.

FIG. 6 is a cross section of an SMC product manufactured in the second embodiment.

[Explanation of symbols]

A cutting device B Glass short fiber feeder 1 cutting roll 2 cutting blades 3 air nozzles 4 Air supply pipe 5 receiving roll 6 rubber 7 slip rings 8 brushes 9 Supporters 10 cutting roll gear 11 Receiver roll gear 12 Feed Roll 13 glass strands 14 Roving device 15 Lower carrier film 16 Lower resin coating device 17 Resin composition 18 Upper carrier film 19 Upper resin coating device 20 Impregnation device 21 Winding device 22 Intermediate layer resin coating device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoichi Kosaka             3-3-4106 Shin-Hinodai, Sakai City, Osaka Prefecture (72) Inventor Isamu Nomura             12-2 Futaba-cho, Itabashi-ku, Tokyo F-term (reference) 4G021 NA01                 4L047 AA05 AB02 BA15 BC07 BC10                       CA06 CB10 CC08 CC10 EA22

Claims (9)

[Claims] 1. A cutting roll having a plurality of cutting blades formed on a cylindrical surface, and each cutting blade row is formed in a spiral shape so as to come into contact with the cutting blades in a predetermined size. In a device having a receiving roll arranged and rotating the cutting roll to press the glass fiber strand under pressure contact with the cutting blade and the receiving roll, the length / diameter (L
A cutting roll having a ratio of / D) of 9 to 15 is attached, and a short glass fiber having a cutting pitch length of 1/8 inch or more and 1/2 inch or less can be continuously produced. Glass fiber strand cutting device. 2. The plurality of cutting blade rows of the cutting roll are each formed so as to have a twist angle of 1.0 ° to 10.0 ° with respect to the rotation axis direction of the roll. Glass fiber strand cutting device. 3. The receiving roll has a Shore A hardness of 70 °.
The glass fiber strand cutting device according to claim 1 or 2, wherein the glass fiber strand cutting angle is about 85 ° and the surface thereof is subjected to antistatic treatment. 4. The diameter ratio of the receiving roll / cutting roll is
It is 1.5-3.0, The glass fiber strand cutting device in any one of Claims 1-3. 5. The glass fiber strand cutting device according to claim 1, further comprising an air nozzle for blowing air to the lower part of the cutting roll. 6. The glass fiber strand cutting device according to claim 1, wherein the cylindrical surface of the cutting roll is a roughened surface of 100 to 800 mesh. 7. The cutting roll and the receiving roll forming a pair have a crown shape.
The glass fiber strand cutting device according to any one of to 6. 8. A liquid unsaturated resin composition is coated on one carrier film, and the length of the unsaturated resin composition supplied from the glass fiber strand cutting device according to claim 1 is 1 / After dispersing and depositing glass short fibers having a size of 8 inches or more and 1/2 inch or less, the other carrier film on which the liquid unsaturated resin composition is applied is used as the unsaturated resin composition of the carrier film. A method for producing a sheet molding compound, which comprises laminating the coated surfaces so that they are in contact with each other. 9. A liquid unsaturated resin composition is applied onto one of the carrier films, and the glass fiber strands are fed to the glass fiber strand cutting device according to any one of claims 1 to 7 on the unsaturated resin composition. While dispersing and depositing glass short fibers having a cut length of ⅛ inch or more and ½ inch or less, a liquid unsaturated resin composition is applied onto the glass short fibers, and other After dispersing and depositing the glass short fibers of, the other carrier film having the liquid unsaturated resin composition applied thereon is laminated so that the application surface of the unsaturated resin composition of the carrier film is in contact with the other carrier film. A method for manufacturing a sheet molding compound, characterized by: