JPH0985742A - Quantitative feeding device for small piece article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously and uniformly feed small piece article by a specified quantity even when the small piece article is a short cut fiber or roughly crushed FRP. SOLUTION: A carrying out port 5 is provided under a storage tank 3 in which a small piece article 2 is housed, and on the bottom part, a conveyor 2 to carry out the small piece article 2 is arranged. In a rotor case 14 to receive the small piece article 2 being carried out from the carrying out port 5, a rotor 16 is arranged. In the peripheral surface of the rotor 16, blades 22 are fixed, and the rotor 16 is rotated at a high speed around the axis in the horizontal direction. A discharging port 17 is provided on the bottom part of the rotor case 14, and the small piece article 2 which is dispersed by the rotor 16 is discharged from the discharging port 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet molding compound (hereinafter abbreviated as SMC) or a bulk molding compound (hereinafter abbreviated as BMC).
When manufacturing a molding material containing small pieces such as cut fibers, etc., the present invention relates to a constant amount supply device capable of continuously and uniformly supplying a predetermined amount of these small pieces.

[0002]

BACKGROUND OF THE INVENTION Generally, SMC is composed of two thermoplastic synthetic resin films such as polyethylene and polypropylene.
While arranging small pieces such as non-directionally dispersed glass fibers as a reinforcing material, a thermosetting resin composition called compound is applied to each inner surface of both films to impregnate the small pieces with this compound, and defoaming Then, it is manufactured by winding it into a roll and aging it.

As an example of the SMC manufacturing apparatus, there is an apparatus configured as shown in the schematic block diagram of FIG. That is, this SMC manufacturing apparatus is
Conveying line (53) for the lower film (52) sent from 1)
Above the table, a first roving chopper (55) and a second roving chopper (55) are provided as a constant quantity feeding device for the small pieces (54) made of cut glass fibers.
The roving chopper (56) is arranged, and the shower pipe (58) for spraying the compound (57) is arranged between both roving choppers (55, 56), and the upper film is supplied to the downstream side of the transfer line (53). A device (59) is arranged. Needless to say, the second roving chopper and the shower tube are omitted when only one layer of the cut glass fiber is deposited.

The SMC is manufactured by the above-mentioned apparatus in the following procedure. First, in the lower film supply device (51), supply roll
The compound (57) is applied to the upper surface of the lower film (52) supplied from (60), and the coating amount of the compound (57) is adjusted to a predetermined constant thickness by the doctor blade (61), and then the transfer line ( Carry on at 53). As the thermosetting resin used in this compound (57), an unsaturated polyester resin,
There are vinyl ester resins, phenol resins, epoxy resins, etc., and if necessary, various fillers and additives such as a polymerization initiator, a release agent, a colorant, a low-shrinking agent, and a thickener are mixed in advance. Kneaded. The above-mentioned fillers and additives include powders of calcium carbonate, aluminum hydroxide, glass balloons, zinc stearate, magnesium oxide, magnesium hydroxide, etc. All of these powders have an average particle size of approximately 10μ to prevent clogging and uneven application with the doctor blade during the transportation and spraying process.
It is in the form of fine powder of m or less.

Next, the glass roving (62) is cut into a length of about 25 mm by the first roving chopper (55), and the cut glass fiber material (54) is applied to the lower film (52). 57) Drop it on its own weight and deposit a fixed amount per unit area. A predetermined amount of the compound (57) is sprayed from the shower pipe (58) onto the deposited glass fiber cut pieces (54), and the second roving chopper (5) is further placed thereon.
The glass fiber cut product (54) is dropped from 6) and deposited.
On the other hand, in the upper film feeding device (59), the upper film (6
The compound (57) is applied to one surface of 3), and the application amount of the compound (57) is adjusted to a predetermined constant thickness with the doctor blade (61). The compound-coated surface of the upper film (63) was superposed on the glass fiber cut product (54) deposited on the lower film (52), and the glass fiber cut product (54) was impregnated with the compound (57) and removed. After foaming, roll up and ripen.

[0006]

2. Description of the Related Art A roving chopper described as the prior art 1 is known as an apparatus for quantitatively supplying small pieces.
As shown in FIG. 6, for example, this roving chopper comprises a rubber roll (64) and a chopper roll (65), and is installed over the entire width of the transport line (53) of the lower film (52). This rubber roll (64) and chopper roll (6
They are placed in parallel with each other and are in slight contact with each other, and rotate in opposite directions. Above chopper roll (6
Cutting blades (66) are planted at appropriate intervals on the surface of (5), and the tips of the cutting blades (66) are slightly projected from the roll surface. When several tens of glass rovings (62) are arranged in parallel between the two rolls (64, 65) at appropriate intervals and are passed, the glass rovings (62) are cut by the cutting blade (66).
It is cut to a length of about 5 mm and drops into glass fiber cut pieces (54) that are small pieces and fall.

Recently, fiber reinforced plastic (FRP)
Waste of molded products and waste such as spools generated during FRP molding are crushed into small pieces, and these small pieces are
Utilization for manufacturing MC and the like has been studied, and for example, there is a conventional technique 2 disclosed in Japanese Patent Publication No. 6-102364. In this prior art 2, the FRP waste is pulverized into fine powder, and the pulverized small pieces are uniformly mixed in the compound as a filler in advance, and the mixture is supplied at the time of manufacturing the SMC.

Further, as a quantitative supply device for a light weight filler such as a glass microballoon, for example, Japanese Patent Application Laid-Open No. 4-718.
There is a conventional technique 3 disclosed in Japanese Patent No. 27. In this Prior Art 3, as shown in FIG. 7, the constant quantity supply device (71) for small pieces is composed of a conveyor belt (72) and an adjusting gate (73), and is connected to the transfer line (75) of the lower film (74). It is located above.
And the small piece (77) supplied from the supply pipe (76) is
While being conveyed by the conveyor belt (72), it is adjusted to a constant amount by the adjusting gate (73), dropped from the tip of the conveyor belt (72) and deposited on the lower film (74) below. .

[0009]

In the above-mentioned prior art 1,
Since it is necessary to use glass roving or the like as a feed material, it cannot be applied to feed small pieces obtained by crushing FRP waste. Further, the glass fiber cut by the roving chopper easily adheres to the roping chopper when the cutting length becomes short, and the glass fiber cut product is contaminated by this adhesion, and the stained glass fiber cut product is applied to the lower film. There is a risk that it will fall onto the compound that has been destroyed.

Further, in the above-mentioned prior art 2, since the small pieces are mixed in advance with the compound, a fine particle diameter similar to that of a filler or the like usually used is used so that the compound does not become clogged during the conveying process. It has to be crushed into small pieces, and coarsely crushed pieces cannot be used. For this reason, there is a problem that a fibrous material cannot be applied and the crushing process must be configured in a plurality of stages, and thus the crushing process is complicated and cannot be performed at a low cost.

On the other hand, in the above-mentioned conventional technique 3, when the small pieces obtained by coarsely crushing the FRP are used, the fibers contained in the small pieces are entangled with each other to form a large lump or a bridge, and the adjusting gate is formed. It is easy to cause clogging. In this case, since the small pieces are not supplied from this clogged portion, there is a problem that the small pieces have a mottled pattern in the width direction of the lower film, and the small piece layer having a uniform mass distribution cannot be formed.

As a device for solving these problems and supplying small pieces while unraveling the entanglement of fibers, a so-called rotary feeder type constant amount supply device equipped with a rotor having several blades on its peripheral surface is provided first. I tried. But,
In this rotary feeder type fixed amount supply device, when the rotation speed of the rotor is set low, the small piece body is easily caught in the gap between the rotor case and the blades of the rotor, the rotation of the rotor fluctuates or stops, and It has not been easy to stably supply a fixed amount of the body. On the other hand, when the rotation speed of the rotor is set to a high value of 200 to 300 rpm, problems such as biting of the small piece disappear, but even if the number of rotations is further increased, the discharge amount of the small piece does not increase so much and the rotation of the rotor is reduced. It was not possible to adjust the supply amount of small pieces by numerical control.

The present invention solves these problems of the prior art and enables even small pieces of fibers or FRP that have been cut into short pieces to be coarsely crushed so that these small pieces can be continuously and uniformly supplied in predetermined amounts. It is a technical object to provide a body quantitative supply device.

[0014]

In order to solve the above-mentioned problems, the present invention has a small-quantity fixed-quantity supply device configured as follows. That is, when explaining based on Drawing 1-Drawing 5 which show an embodiment of the present invention, the present invention stores the small piece body (2) and the storage tank (3) which has a carrying-out port (5) in the lower part, and this storage. Tank
A conveyor (4) which is arranged at the bottom of (3) and carries out the small piece (2) from the carry-out port (5), and receives the small piece (2) carried out from the carry-out port (5) and at the bottom. Provided outlet (1
(7) A rotor case (14) configured to discharge the small piece (2), and a rotor (14) that rotates around a horizontal axis in the rotor case (14) and has blades (22) on its peripheral surface ( 16) and are provided.

Here, the small piece (2) is a mixture of FRP wastes such as SMC and BMC, which are coarsely crushed and have a large particle size to fine particles, and glass fibers, for example.
It refers to fiber cut products cut into short lengths of about 1/4 inch, short fiber products such as whiskers, etc.
It may be other powder or granules such as commonly used fillers.

The storage tank (3) may be a hopper, a tank or the like as long as it can accommodate an appropriate amount of small pieces and has a carry-out port at the bottom. Further, the rotor (16) may be any one as long as it can rotate around the axis in the horizontal direction, and may be, for example, a shaft or a cylinder having a polygonal cross section in addition to the shaft or the cylinder having a circular cross section. When the cross section is polygonal, the blades (22) may be attached to each corner.

[0017]

The small piece (2) contained in the storage tank (3) is carried out from the carry-out port (5) by the conveyor (4) at the bottom. The mass of the discharged small piece (2) is adjusted by the conveying speed of the conveyor (4), but the mass of the small piece (2) discharged when the conveying speed of the conveyor (4) is maintained at a constant speed. Is also a fixed amount. The small piece (2) sent out by the conveyer (4) is received by the lower rotor case (14) and is untangled by the blades (22) of the rotor (16) rotating at a high speed. ) Is evenly diffused in the length direction. The uniformly dispersed small pieces (2) are discharged from the discharge port (17) at the bottom of the rotor case (14), for example, on the compound (35) applied to the lower film (27) conveyed below. It is supplied in a state of being uniformly distributed in the width direction.

At this time, if the accumulated height of the small pieces (2) above the rotor case (14) is made too high, the large particles of the small pieces (2) support each other to form a bridge structure,
On the other hand, it becomes difficult for the small pieces (2) to fall, and fine particles in the small pieces (2) slip through the large particles forming the bridge structure, and as a result, the small pieces (2) are made uniform and It becomes difficult to supply evenly. Therefore, the amount of the small pieces (2) accumulated above the rotor case (14) should be controlled as small as possible and adjusted to a constant amount, whereby the small pieces (2) from the discharge port (17) can be operated. The discharge amount of) changes little with time, and the small piece (2) can be stably supplied in a fixed amount. For example, this small piece (2)
It is desirable to adjust the accumulation height of the blades to a position slightly higher than the height of the blades (22) located at the top of the rotor (16).

In the case where the adjusting gate (10) is arranged at the carry-out port (5) and the gap (12) with the conveyor (4) can be adjusted by opening and closing the adjusting gate (10). The carry-out amount of the small piece (2) from the carry-out port (5) is changed and adjusted by opening / closing the adjusting gate (10).

A plurality of blades (22) are provided on the peripheral surface of the rotor (16).
When the blades (22) are arranged at equal intervals in the rotor circumferential direction, the diffusion of the blades of this rotor in the rotor case becomes more uniform, and the small pieces from the discharge port (17) The emission amount of (2) changes less with time.

A discharge port at the bottom of the rotor case (14)
In (17), opening and closing means for adjusting the opening area of this outlet (17)
When the (18) is attached, the supply amount of the small piece bodies (2) can be easily controlled, and the small piece bodies (2) can be supplied more uniformly. The opening / closing means (18) only needs to be capable of adjusting the opening area of the discharge port (17), and therefore includes a shutter that can be moved in the horizontal direction, a damper made of a rotating plate, and a double door lid. To be

A scraping means (23) is attached to the bottom of the rotor case (14), and the tip (24) of the scraping means (23) is attached.
If it is configured to be close to the rotor (16), the rotor (1
The small piece (2) attached to 6) is the scraping means (23).
Since it is scraped off by, the amount of supply can be further stabilized and the small pieces (2) can be uniformly supplied. The scraping means (23) may be any means that scrapes off small pieces attached to the rotor, and means a doctor plate having a flat plate structure or a rod-shaped structure.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. FIG. 1 is a partially cutaway front view of a small-piece quantitative feeding device, and FIG. 2 is a sectional view taken along the line AA of FIG.

As shown in FIG. 1, the constant quantity supply device (1) for the small pieces has a conveyor (4) arranged at the bottom of a hopper (3) for accommodating the small pieces (2). A carry-out port (5) is opened in the lower part of the hopper side wall (3a) on the downstream side in the carrying direction. The conveyor (4) is composed of a synthetic rubber endless belt (7) stretched between a pair of pulleys (6, 6), and is driven at a predetermined conveying speed by a drive device (8) including a motor and a transmission. It is set and driven. Further, as shown in FIGS. 1 and 2, the side wall (3a) of the hopper has a carry-out port.
An adjustment gate (10) is attached to the outside of (5), and the adjustment gate (1) is moved by moving the adjustment gate (10) up and down.
The gap (12) between the tip (11) of the (0) and the conveyor (4) is adjusted.

The conveyor (4) does not necessarily have to be arranged in a horizontal state as in this embodiment. For example, the upstream half may be inclined as in the modification shown in FIG. May be tilted,
It is only necessary to convey (2), and it is not limited to the one using the rubber endless belt as in this embodiment.

The carry-out port (5) has a lower upper chute (1
3), the rotor case (14) is arranged below the upper chute (13), and the small piece (2) carried out from the carry-out port (5) is guided to the rotor case (14). It is configured to take it.

The upper chute (13) has an outer surface so that the small piece (2) carried out from the carry-out port (5) can be smoothly guided to the rotor case (14) without generating a bridge or the like. An air knocker (15) is attached. However, this air knocker can be omitted if there is no risk of a bridge or the like depending on the type of small piece.

The rotor case (14) has a cylindrical lower half and has a rotor (1) which rotates around an axis in the horizontal direction.
6), and the discharge port (17) is opened at the bottom. The discharge port (17) is provided with a shutter (18) as an opening / closing means for adjusting the opening area, and a discharge chute (19) is connected to the lower part. The length of the discharge chute (19) can be changed by the adjusting screw (20), and the interval with the lower film transport line (21) can be adjusted.

The rotor (16) has a plurality of blades (22) fixedly provided on its peripheral surface so that it can rotate around a horizontal axis at a predetermined high speed. In addition, the rotor case (1
4) A doctor plate (23) is attached to the bottom discharge port (17) as a scraping means, and this doctor plate (23)
Is moved so that its tip (24) can come close to the rotor (16).

[0030]

[Embodiment 1] Next, using the above-mentioned fixed quantity supply device (1), FR
Small pieces of coarsely pulverized P waste were sprayed.

(1) Preparation of small pieces FRP products were injection-molded using the product name "Polymer mat" (manufactured by Takeda Pharmaceutical Co., Ltd., glass fiber content 35% by weight, glass fiber length 0.5 inch). The spool and runner generated during this were crushed to obtain a coarsely crushed product. The particle size distribution of this coarsely crushed product is shown in Table 1.

[0032]

[Table 1]

Among the coarsely crushed products, the sieve opening is 2.8 m
Those that passed through m and remained on a sieve opening of 0.5 mm were used as small pieces. In this small piece, a string-like material having a length of about 1 to 8 mm, a fibrous material, lumps of various sizes and the like are mixed.

(2) Spraying of small pieces The above small pieces (2) were sprayed on the lower film by the constant amount supply device (1) using the SMC manufacturing apparatus which moves the lower film at a speed of 2 m / min. The rotor (16) has a diameter of 60 mm, a number of blades of 6 and a blade height of 15 mm.
The rotation speed was set to 1000 rpm. Further, the doctor plate (23) was kept away from the rotor (16) and was not operated. As for the supply amount of the small pieces (2), the opening of the adjusting gate is set to 20 mm, and the speed of the belt conveyor (4) and the opening of the discharge port (17) by adjusting the shutter (18) are changed. By doing, the set value was changed.

(3) Results of quantitative measurement of spraying After the start of spraying, the mass of the small pieces (2) sprayed per unit area (0.3 m width x 1 m length) was measured every 2 minutes. The results are shown in Table 2.

[0036]

[Table 2]

According to the above-mentioned measurement result and the result of visual observation of the distribution state of the small pieces, the small pieces supplied from the quantitative supply device of the present invention and scattered are the width direction and line length of the conveying line of the SMC manufacturing apparatus. The distribution was almost uniform in both directions.

[0038]

[Embodiment 2] Next, small pieces (2) made of cut glass fiber were sprayed by the above-mentioned constant quantity supply device (1).

(1) Preparation of Small Pieces Glass roving (manufactured by Nitto Boseki Co., Ltd.) was cut into a length of 1/4 inch and used as small pieces.

(2) Dispersion of Small Pieces Using the same SMC manufacturing apparatus as in Example 1 above, the small pieces were dispersed. However, the number of blades fixed to the rotor 16 was eight, and the blade height was set to 7 mm. Further, the doctor plate (23) was made to operate by having the tip (24) close to the rotor (16). Other conditions such as the rotation speed were set in the same manner as in Example 1 above.

(3) Results of quantitative measurement of spraying Two and six minutes after the start of spraying, the unit area (0.3 m
The mass of the small pieces (2) scattered per (width × 1 m length) was measured. Table 3 shows the results.

[0042]

[Table 3]

As a result of the above measurement, in the case of using the glass fiber cut product cut into a certain size, as compared with the case of using the small piece of Example 1 in which particles of various sizes are mixed,
The dispersion of the sprayed mass was small, and the small pieces could be supplied more uniformly and quantitatively.

[0044]

[Embodiment 3] FIG.
The schematic block diagram when using in a C manufacturing line is shown. This S
The MC manufacturing device (25) comprises a first roving chopper (29) and a fixed amount of the above-mentioned small pieces of the present invention above the transport line (21) of the lower film (27) sent from the lower film supply device (26). The supply device (1), the shower tube (30), and the second roving chopper (31) are arranged in this order, and the transfer line (2
An upper film supply device (32), a defoaming / impregnating device (33), and an SMC winding device (34) are sequentially arranged on the downstream side of 1).

The SMC is manufactured by the above-mentioned SMC manufacturing apparatus in the following procedure. (1) Preparation of compound First, to 103 parts by weight of unsaturated polyester resin, 1
0.2 parts by weight of 0% parabenzoquinone was added and stirred.
Next, while stirring this, 1.0 part by weight of t-butyl perbenzoate, 3.5 parts by weight of zinc stearate and 73 parts by weight of calcium carbonate were sequentially added and stirred to knead. Immediately before use, 0.85 part by weight of magnesium oxide was added and kneaded to prepare a compound (35).

(2) Production of SMC The above-prepared compound (35) is applied to the upper surface of the lower polyethylene film (27) supplied from the supply roll (36) of the lower film supply device (26), and a doctor blade is applied. (3
Apply the compound (35) coating amount in 7) to 6 per 30 cm x 30 cm.
Adjusted to 4 g. This lower polyethylene film (27) is transported by the transport line (21), on the compound coated surface,
First glass roving (manufactured by Nippon Glass Fiber Co., Ltd.) (28)
1 inch long glass fiber cuts (38) obtained by cutting with a roving chopper (29) are sprinkled and deposited. The scattered amount of this glass fiber cut product (38) is 37.30 cm × 30 cm.
It is adjusted to 5 g.

On the deposited glass fiber cuttings (38),
Using the quantitative supply device (1) of the present invention, the small pieces (2) used in Example 1 were sprayed in an amount of 32 g per 30 cm × 30 cm. At this time, the operation conditions of the constant quantity supply device (1) are as follows: conveyor speed of conveyor (4): 1.6 m / min, opening of control gate (10): 20 mm, rotation speed of rotor (16): 1000 rpm, discharge The opening of the outlet (17): 6 mm.

On the scattered small pieces (2), the compound (35) is sprayed from the shower tube (30) in an amount of 64 g per 30 cm × 30 cm, and then the second roving chopper (31) is used to 30 cm of inch-long glass fiber cuttings (38)
It was applied in an amount of 37.5 g per × 30 cm.

Next, the compound (35) is applied to one side of the upper polyethylene film (39) by the upper film feeder (32), and the amount of the compound (35) applied is 64 g per 30 cm × 30 cm by the doctor blade (37). It was adjusted. Then, the compound coated surface of the upper film (39) is overlaid on the glass fiber cut product (38) deposited on the lower film (27), and the glass fiber cut product (38) is defoamed / impregnated (33). The small pieces (2) were impregnated with the compound (35) to remove bubbles, and then wound into a roll on the SMC winding device (34). Then, after aging at about 40 ℃ for about 2 days, the mass is 3
300 g of SMC was obtained per 0 cm x 30 cm. This SMC
The composition of was as follows. Unsaturated polyester resin: 37.5% by weight Calcium carbonate: 26.8% by weight Small pieces (crushed product): 10.7% by weight Glass fiber cuttings: 25.0% by weight

(3) Flat plate molding Using the SMC obtained by the above SMC manufacturing apparatus,
A flat plate was molded under the following molding conditions.

A flat plate having a thickness of 3 mm is cut into two pieces having a size of about 27 cm square so that the cut sheets are oriented at right angles to each other, that is, SMC.
They are piled up so that the conveying directions at the time of manufacture are at right angles to each other, put into a flat plate molding die, and the upper die 150 ° C., the lower die 14
A flat plate having a size of 300 mm × 300 mm and a thickness of 3 mm was molded under molding conditions of 0 ° C., a pressure of 100 kgf / cm ² , and a pressing time of 3 minutes.

Flat plate having a thickness of 4 mm The four SMCs are cut into a size of about 20 cm square, and the cut sheets are superposed so that the directions of the cut sheets are adjacent to each other at right angles, and then put into a flat plate molding die. did. And upper mold 150 ℃, lower mold 140 ℃, pressurizing force 100Kgf / cm
² , 300mm × 30 in size under the molding condition of pressurizing time 4 minutes
A flat plate having a thickness of 0 mm and a thickness of 4 mm was formed.

[0053]

[Example 4] Next, as compared with the above Example 3, the amount of the small pieces made of crushed products was doubled, and an SMC containing about 20% by weight of the small pieces was produced. Molded.

(1) Preparation of compound A compound was prepared by adding calcium carbonate in an amount of 43 parts by weight and magnesium oxide in an amount of 1.05 parts by weight, with the other composition and mixing procedure being the same as in Example 3 above. did.

(2) Production of SMC The coating amount of the compound (35) in the lower film supply device (26), the shower tube (30) and the upper film supply device (32) is
54 g per 30 cm × 30 cm, and the amount of the small pieces (2) sprayed by the constant quantity supply device (1) of the present invention is 30 cm.
The weight was 64 g per 30 cm, and the other manufacturing conditions were the same as in Example 3 above. In addition, the operating conditions of the constant quantity supply device (1) in this Example 4 are as follows: the conveyor (4) conveying speed: 3.2 m / min, the adjusting gate (10) opening: 20 mm, the rotor (16) rotation. Speed: 1000 rpm, opening of discharge port (17): 8 mm. The composition of the obtained SMC was as follows. Unsaturated polyester resin: 37.5% by weight Calcium carbonate: 16.2% by weight Small piece (crushed product): 21.3% by weight Glass fiber cut product: 25.0% by weight

(3) Molding of flat plate By the same operation as in Example 3, a flat plate having a thickness of 3 mm and a flat plate having a thickness of 4 mm were molded.

[0057]

Comparative Example Next, in order to compare with the above-mentioned Examples 3 and 4, SMC containing the above-mentioned crushed product and containing no small piece was manufactured and a flat plate was formed.

(1) Preparation of compound A compound was prepared by adding 103 parts by weight of calcium carbonate and 0.7 part by weight of magnesium oxide, with the other composition and mixing procedure being the same as in Example 3 above. did.

(2) Manufacture of SMC Lower film supply device (26) and upper film supply device (3
The coating amount of compound (35) in 2) is 30 cm ×
113g per 30cm, 1st roving chopper (2
The amount of the 1-inch-long cut glass fiber (38) according to 9) was 75 g per 30 cm × 30 cm. The supply of the compound by the shower tube and the supply of the cut glass fiber by the second roving chopper were omitted. Obtained S
The composition of MC was as follows. Unsaturated polyester resin: 37.5% by weight Calcium carbonate: 37.5% by weight Glass fiber cut product: 25.0% by weight

(3) Molding of flat plate By the same operation as in Example 3, a flat plate having a thickness of 3 mm and a flat plate having a thickness of 4 mm were respectively molded.

Next, the physical properties of the flat plates obtained in Examples 3 and 4 and Comparative Example were measured. However, the shrinkage rate, the centerline average roughness Ra, and the Orange Peel Index were measured using a flat plate having a thickness of 4 mm, and the other measurement items were measured by cutting out a test piece from a flat plate having a thickness of 3 mm. Table 4 shows the measurement results.

[0062]

[Table 4]

As a result of comparative observation of Examples 3, 4 and Comparative Examples and measurement of the above-mentioned various physical properties, SMC obtained by adding up to about 20% of small pieces consisting of crushed products using the quantitative supply device of the present invention. Shows no deterioration in quality in terms of compound impregnation, variation per unit area, and appearance,
Also, regarding the physical properties of the molded product obtained from SMC, the surface was slightly uneven, but almost no other physical property deterioration was observed.

[0064]

[Embodiment 5] In each of Embodiments 3 and 4, SM is produced by sprinkling the small pieces on the compound applied to the lower film, and superposing the upper film thereon.
Although the case where it is applied to the C manufacturing apparatus has been described, the small-quantity fixed-quantity supply apparatus of the present invention can also be applied to other types of SMC manufacturing apparatuses. For example, FIG. 5 shows Example 5 and is a schematic configuration diagram when the quantitative supply device of the present invention is applied to another type of SMC manufacturing device called a so-called thick molding compound (abbreviated as TMC).

In the fifth embodiment, a constant quantity supply device for small pieces is used.
A pair of kneading rolls (40) is arranged below (1), and a small amount of small pieces are quantitatively supplied onto the kneading rolls (40) from the constant quantity supply device (1), and a compound (35 ) Is supplied and kneading is performed while the small pieces are impregnated with the compound (35) by the kneading roll (40), and the mixture (42) is discharged downward in the form of a sheet. Then, a thermoplastic synthetic resin film is formed on both surfaces of the sheet-like mixture (42) below the kneading roll (40).
(43 ・ 43) are piled up, defoamed while being conveyed on the conveying line (44), wound and then matured to obtain SMC (T
MC) is manufactured.

Further, although the above-mentioned embodiments have all been described as being applied to the SMC manufacturing apparatus, the apparatus for quantitatively supplying small pieces of the present invention can be applied to various small pieces such as coarsely crushed FRP waste and fiber cuts. It is needless to say that the present invention can be applied to other molding material manufacturing apparatuses containing small pieces such as a BMC continuous manufacturing apparatus, for example, since a predetermined amount of each body can be continuously and uniformly supplied.

[0067]

【The invention's effect】

(B) Even if the small pieces partially clog at the outlet of the storage tank or become entangled with each other to form a lump,
The small pieces guided in the rotor case are uniformly diffused in the lateral direction by the stirring action of the rotor, and are discharged from the discharge port by a predetermined amount, so these small pieces are evenly massed over the entire length of the required lateral width. While being distributed, it is possible to quantitatively supply in a stable state with little change in quantity over time.

(B) Even small particles having a large particle size to a small particle size can be continuously supplied uniformly in a predetermined amount, so that a coarsely crushed FRP waste can be applied. These resources can be recycled at low cost.

(C) The small pieces are made of glass fiber, for example, 1/4
Even for fiber cuts cut into short lengths such as inches, it is possible to prevent the fiber cuts from being easily polluted by the roping chopper, and supply a fixed amount of good quality fiber cuts while evenly distributing the mass. can do.

(D) When an adjusting gate is arranged at the carry-out port and the gap between the conveyor and the conveyor can be adjusted by opening / closing the adjusting gate, the opening / closing operation of the adjusting gate allows the small pieces from the carry-out port to be removed. Since the carry-out amount can be changed, this makes it possible to easily change and control the supply amount of the small pieces.

(E) When a plurality of blades are attached to the peripheral surface of the rotor and the blades are arranged at equal intervals in the rotor circumferential direction, the diffusion of the blades of the rotor in the rotor case becomes more uniform. As a result, the small pieces can be more uniformly and quantitatively supplied.

(F) When the outlet at the bottom of the rotor case is provided with an opening / closing means for adjusting the opening area of the outlet, the supply amount of the small pieces can be easily controlled and a predetermined amount of the small pieces can be evenly distributed. Can be supplied to.

(G) When the scraping means is attached to the bottom of the rotor case and the tip of the scraping means can be brought close to the rotor, small pieces easily attached to the rotor can be scraped off by the scraping means. Therefore, the supply amount can be further stabilized and the small pieces can be uniformly supplied.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a constant quantity supply device for small pieces according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view of a modified example of the conveyor of the present invention.

FIG. 4 is a schematic configuration diagram in the case where the small-piece quantitative supply device of the present invention is used in an SMC manufacturing line.

FIG. 5 is a schematic configuration diagram in the case where the fixed quantity supply device of the present invention is applied to another type of SMC manufacturing device.

FIG. 6 is a schematic configuration diagram of a conventional SMC manufacturing apparatus.

FIG. 7 is a schematic configuration diagram of an SMC manufacturing apparatus to which a small-piece quantitative feeding device of prior art 3 is applied.

[Explanation of symbols]

 2 ... Small pieces (FRP coarsely crushed product, glass fiber cut product), 3 ... Storage tank (hopper), 4 ... Conveyor, 5 ... Outgoing port, 10 ... Control gate, 12 ... Gap between control gate and conveyor, 14 ... Rotor case, 16 ... Rotor, 17 ... Discharge port, 18 ... Opening / closing means (shutter), 22 ... Blades, 23 ... Scraping means (doctor plate), 24 ... Tip of scraping means.

Claims (5)

[Claims] 1. A storage tank (3) for accommodating a small piece (2) and having a carry-out port (5) at a lower part, and a smaller piece () arranged at the bottom of the storage tank (3) than the carry-out port (5). Conveyor for carrying out 2) (4)
And the small piece body (2) that receives the small piece body (2) carried out from the carry-out port (5) and the discharge port (17) provided at the bottom.
And a rotor case (14) that is configured to be discharged, and the rotor case (14) rotates around a horizontal axis and the blades
And a rotor (16) having (22). 2. An adjusting gate (10) is arranged at the carry-out port (5),
By opening and closing this adjusting gate (10), the conveyor
The small-quantity fixed-quantity supply device according to claim 1, wherein the gap (12) with the (4) is adjustable. 3. The rotor according to claim 1, wherein a plurality of blades (22) are attached to the peripheral surface of the rotor (16), and the blades (22) are arranged at equal intervals in the rotor circumferential direction. Fixed-quantity supply device for small pieces. 4. The outlet (17) at the bottom of the rotor case (14),
The quantitative supply device for small pieces according to any one of claims 1 to 3, further comprising an opening / closing means (18) for adjusting an opening area of the discharge port (17). 5. A scraping means on the bottom of the rotor case (14)
5. A structure comprising a (23) attached thereto, wherein the tip (24) of the scraping means (23) can be brought close to the rotor (16).
The quantitative supply device for small pieces according to any one of 1.