JP2001233630A - Method of producing chopped strands, producing machine thereof and chopped strands produced by this production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of producing chopped strands that can inhibit the occurrence of the so-called bridging phenomena by equalizing the particle size of the whole chopped strands and lowering the compressibility, and provide producing equipment, and the chopped strands produced through the process. SOLUTION: Fifteen strands pulled out of 15 cakes 21 are collected and bundled via the bundling guide 22 and treated with water or a treatment solution by means of the sprayer 23 and the treated strand bundle are chopped with the chopping machine 24 into the CS of 3 mm length. The resultant chopped strands 25 are fed into the spiral vibratory trough mechanism from the lower end. The vertical shaft-rotating reciprocal vibrations and the vertical vibration are applied to the central cylinder 21 of the spiral vibratory trough machine and to the trough by the vibration generator, whereby the chopped strands go forward by the rotary vibration action along the spiral trough 28 upward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a chopped strand, an apparatus for producing the same, and a chopped strand produced by the method.

[0002]

2. Description of the Related Art Conventionally, fiber reinforced resins are thermoplastic resins,
It is obtained by mixing a chopped strand (hereinafter, referred to as “CS”) obtained by cutting fibers into a predetermined length into a matrix such as a thermosetting resin. In particular, in the production of fiber-reinforced thermoplastic resin, a mixture of CS, resin and filler is fed into an extruder by an automatic feeder while maintaining a constant blending ratio to produce a pellet containing a reinforcing material, and this pellet is produced. To the injection molding machine to produce molded products,
Alternatively, a method of manufacturing a molded product by simultaneously supplying CS and resin directly into an injection molding machine has been adopted.

[0003] In the above method, when CS and resin are supplied to an extruder or an injection molding machine, the CS is fluffed or causes a yarn breakage. It is difficult to perform a constant and stable supply of CS due to the so-called bridge phenomenon. As a method of solving this problem, a method of producing a high-density CS in which the CS obtained by cutting is given a rolling vibration action in a wet state to make the CS into a cylindrical shape having a substantially circular cross-section and become tight (for example, Japanese Patent Application Laid-Open Nos. 58-213650 and 1-24900) and a method in which an aqueous solution containing a silane coupling agent is attached to a large number of glass filaments, subjected to a primary treatment, and they are aligned and bundled for a predetermined length. The resulting CS is subjected to a secondary treatment by attaching a solution containing an organic compound having a molecular weight of 300 or more to the CS thus cut, and further subjected to a rolling vibration action and then dried, so that the angle of repose is 25 degrees or less. (See, for example, JP-A-8-918)
No. 65).

[0004]

However, according to the above-mentioned method, since the produced CS has a high bulk density but an irregular particle size, the difference between the natural bulk density and the compressed bulk density is large, and the compression ratio represented by the following formula is large. A phenomenon in which the rate increases, specifically, a phenomenon in which small grains enter between large grains occurs.

Compressibility (%) = (compressed bulk density−natural bulk density) / compressible bulk density (× 100) Therefore, C in a hopper or a flexible container
S still cannot be prevented from becoming tight,
The bridging phenomenon could not be eliminated.

The present invention provides a method of manufacturing a chopped strand, which can reduce the compression ratio by uniformizing the particle size of the entire CS, thereby preventing the so-called bridging phenomenon, an apparatus for manufacturing the same, and a method for manufacturing the chopped strand. In providing chopped strands.

[0007]

In order to achieve the above object, a manufacturing method according to the present invention is characterized in that a chopped strand is provided with a rolling vibration action on a spiral path having a central axis oriented in a vertical direction. It is characterized by comprising a transporting step of transporting while transporting.

According to the manufacturing method of the first aspect, the chopped strand is conveyed while imparting a rolling vibration action on the spiral path whose central axis is oriented in the vertical direction. The part can be formed in a substantially cylindrical body or a substantially elliptical cylindrical body that is in a plane substantially perpendicular to the longitudinal axis direction, and as a result, it is possible to uniform the grain size of the entire chopped strand, thereby reducing the compression ratio That is, the occurrence of a so-called bridge phenomenon can be prevented.

In a second aspect of the present invention, in the manufacturing method of the first aspect, the rolling vibration has a frequency of 600 to 6000 c / min and an amplitude of 1 to 10 mm.

According to the manufacturing method of the present invention, the rolling vibration has a frequency of 600 to 6000 c / min and an amplitude of 1 to 10 mm. The moving distance can be made appropriate.

According to a third aspect of the present invention, there is provided the method of manufacturing a chopped strand according to the first or second aspect.
The method is characterized by including a cutting step of obtaining the chopped strand by cutting a strand composed of 100 to 1000 glass filaments into a predetermined length.

According to the manufacturing method of the third aspect, 100
Since the chopped strand is obtained by cutting a strand consisting of up to 1000 glass filaments into a predetermined length, the effect of the manufacturing method according to claim 1 can be reliably achieved.

In order to achieve the above object, a manufacturing apparatus according to a fourth aspect of the present invention is characterized in that the conveying means for conveying the chopped strands while imparting a rolling vibration action on a spiral path whose central axis is oriented in a vertical direction. It is characterized by having.

According to the fourth aspect of the present invention, the chopped strand is conveyed while imparting a rolling vibration action on a spiral path whose central axis is oriented in the vertical direction. The part can be formed in a substantially cylindrical body or a substantially elliptical cylindrical body that is in a plane substantially perpendicular to the longitudinal axis direction, and as a result, it is possible to uniform the grain size of the entire chopped strand, thereby reducing the compression ratio That is, the occurrence of a so-called bridge phenomenon can be prevented.

According to a fifth aspect of the present invention, in the chopped strand manufacturing apparatus according to the fourth aspect, the rolling vibration action has a frequency of 600 to 6000 c / min and an amplitude of 1 to 10 mm. I do.

According to the manufacturing apparatus of the fifth aspect, the rolling vibration action has a frequency of 600 to 6000 c / min and an amplitude of 1 to 10 mm. The moving distance can be made appropriate.

According to a sixth aspect of the present invention, in the manufacturing apparatus of the fourth or fifth aspect, the cutting means for obtaining the chopped strand by cutting a strand consisting of 100 to 1000 glass filaments into a predetermined length. It is characterized by having.

According to the manufacturing apparatus of the sixth aspect, 100
Since the chopped strand is obtained by cutting a strand composed of up to 1000 glass filaments into a predetermined length, the effect of the manufacturing apparatus according to claim 5 can be reliably achieved.

The chopped strand according to claim 7 is
A chopped strand manufactured by the method for manufacturing a chopped strand according to any one of claims 1 to 3, wherein an outer peripheral portion of an end face is substantially a cylinder or a substantially ellipse in a plane substantially perpendicular to a longitudinal axis direction. It is characterized by comprising a cylindrical body.

According to the chopped strand according to the seventh aspect, the chopped strand is formed of a substantially cylindrical body or a substantially elliptic cylindrical body whose outer surface at the end face is in a plane substantially perpendicular to the longitudinal axis direction. It is possible to make the particle sizes uniform, thereby reducing the compression ratio and preventing the so-called bridging phenomenon from occurring.

The chopped strand according to claim 8 is
The chopped strand according to claim 7, wherein 3% by weight or less of grains having an opening of 4000 μm or more is 3% by weight or less of grains having an opening of 425 μm or less.

According to the chopped strand of the eighth aspect, 3% by weight of grains having an opening of 4000 μm mesh or more.
3% by weight of particles having a mesh size of 425 μm or less
Because of the following, the compression ratio is reduced, and the occurrence of a so-called bridge phenomenon can be prevented.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION As a result of intensive studies to achieve the above object, the present inventor has found that a chopped strand is rolled on a spiral path having a central axis oriented in a vertical direction while imparting a vibration effect. When transported, the chopped strand can be formed into a substantially cylindrical body or a substantially elliptical cylindrical body whose outer surface at the end face is in a plane substantially perpendicular to the longitudinal axis direction. As a result, the grain size of the entire chopped strand can be uniformed. It has been found that it becomes possible to reduce the compression ratio and prevent the so-called bridge phenomenon from occurring.

Further, it has been found that, preferably, when the chopped strand is obtained by cutting a strand consisting of 100 to 1000 glass filaments into a predetermined length, the above-mentioned effect can be surely exerted.

The present invention has been made based on the results of the above research.

Hereinafter, a CS manufacturing apparatus according to an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to this embodiment.

The CS manufacturing apparatus according to the embodiment of the present invention includes a strand spinning apparatus (FIG. 1) for concentrating glass filaments and a CS granulating apparatus (FIG. 2).

FIG. 1 is a schematic configuration diagram of a strand spinning apparatus in a CS manufacturing apparatus according to an embodiment of the present invention.

A large number (not shown, for example, about 2400)
The molten glass heated and melted by a melting furnace (not shown) is introduced into the bushing 10 having the nozzles of the present invention.
00 glass filaments 11 are formed. As the glass raw material, various types of glass that are usually used in producing CS can be used, but E glass, which can easily be made into glass fibers and has good properties, for example, E glass is preferable.

After the water for cooling is sprayed on the glass filament 11, a binder (bundling agent) for binding a large number of the glass filaments 11 as strands is applied by a binder applicator 12. The binder applicator 12 is a container 1 containing a binder.
3 and a roller 14 that rotates in contact with the binder in the container 13. The binder is applied by the glass filament 11 contacting the peripheral surface of the roller 14. The binder contains starch or an adhesive component composed of a vinyl acetate-based, acrylic-based, urethane-based or epoxy-based synthetic resin as a component, and has a solid content of 5 to 10% by weight.

When the adhesion rate of the binder is defined as the ratio of the weight of the solid content of the adhering binder to the total weight of the glass filament 11 and the binder adhering to the glass filament 11, the binder adhesion rate is 0.1 to 0.1%.
2.0%, particularly preferably 0.3 to 1.5%. When the binder adhesion rate is 0.1% or less, CS is likely to be broken at the time of drying, which is a problem in quality.
A large CS having a mesh size of μm or more increases to cause bridging easily, and the convergence force becomes too strong, which may cause a problem of unopened fiber when mixed with a resin.

The adhesion rate of the binder is determined according to JIS R34.
The weight loss is represented by the “loss on ignition” described in No. 20, specifically, the rate of weight loss (%) when heated at 625 ° C. for 15 minutes after evaporating the moisture of the attached binder.

A large number of glass filaments 11 coated with a binder are respectively provided by three reinforcing pads 15 arranged downstream of the binder applicator 12, for example, 800 filaments.
It is bundled as three strands of glass filaments.

The glass filament 11 is 100 to 10
It is preferable to divide into 00 glass filaments,
If the number is less than 100, the frequency and the moving distance required to obtain CS having a desired particle size become excessively large, and if the number is more than 1,000, the size of the particles becomes excessive even if the frequency and the moving distance are adjusted.

Further, each strand converged by the reinforcing pad 15 is wound while being traversed by a cylindrical tube 18 traverse finger 16 fitted on the collet 17. By extracting from the collet 17 the cylindrical tube 18 on which the strand has been wound in this way, a strand winding body (cake) 21 is obtained.

In the strand spinning apparatus shown in FIG. 1, the binder applicator 12 may be provided on the downstream side of the reinforcing pad 15.

FIG. 2 is a schematic configuration diagram of a CS granulator in a CS manufacturing apparatus according to an embodiment of the present invention.

In FIG. 2, the krill 20 has 15 pieces of the cake 21 produced by the strand spinning apparatus shown in FIG.
The pieces are stored in a dry state. This cake 21 is, for example, a wound body of 800 strands of glass filaments 11 having an average diameter of 6 to 24, preferably 9 to 13 μmφ. The fifteen strands drawn from the fifteen cakes 21 are bundled as a strand bundle by a focusing guide 22, and water or a processing liquid is sprayed on the strand bundle by a spraying device 23.

The water content of the water or the processing liquid sprayed by the spraying device 23 is calculated as the water content, which is the ratio of the weight of the water or the processing liquid 13 to the total weight of the strand bundle and the water or the processing liquid attached to the strand bundle. When specified in terms of percentage (%), the moisture percentage is preferably 5 to 20%, particularly preferably 9 to 14%. If the water content is less than 5%, the bonding strength is weak and it is difficult to granulate CS.
Can not be obtained. In the present embodiment, the water content is 10%.

Next, the strand bundle sprayed with the water or the processing liquid is cut into a length of 3 mm by a cutting device 24 (cutting means), and the cut CS 25 is placed in a spiral vibration trough device 26 (conveying means). Supplied from the lower end. The cutting length is preferably 1 to 13 mm, particularly preferably 1.5 to 6 mm. CS when cutting length is 1mm or less or 13mm or more
Granulation is difficult. The CS 25 may be supplied from the upper end of the spiral vibration trough 26. In this case,
The CS 25 slides on a trough 28 described later by its own weight, and granulation tends to be insufficient.

The spiral vibration trough device 26 mainly has a diameter of 400 to 1500 whose center axis is oriented in the vertical direction.
mmφ, in the present embodiment, a central cylindrical body 27 having a diameter of 1000 mmφ, and a trough 28 attached in a spiral shape around the central cylinder 27. The trough 28 has a groove shape as shown in a cross-sectional view in FIG. The bottom is a double structure with a hollow inside. A heating medium for heating the CS on the trough 28 to evaporate the water (solvent) attached to the CS flows through the bottom cavity. By controlling the temperature of the heating medium, it is possible to adjust the water content of CS, and thus the degree of granulation.

The central cylindrical body 27 is installed on the bed via the elastic body 31 and includes the central cylindrical body 27 and the trough 2.
8, a reciprocating vibration around the vertical axis and a vertical vibration are applied by a vibration generator (not shown). Thereby, trough 2
The CS in 8 advances while rolling upward on the spiral trough 28 by the rolling vibration action.
The frequency of the rolling vibration applied to the trough 28 is 60
The amplitude is preferably 0 to 6000 c / min, particularly 1800 to 3600 c / min, and the amplitude is preferably 1 to 10 mm, particularly preferably 1 to 2 mm. At a frequency of 600 c / min or less or an amplitude of 1 mm or less, the vibration is too weak to make granulation of CS difficult, or C
Granulation of S takes too much time, and frequency 6000c /
If the minute or the amplitude is 10 mm or more, the vibration is too strong.
However, it is difficult to granulate CS because the particles bounce without rolling.

As described above, as the CS rolls upward on the trough 28, the rounding of the CS progresses, and the flat cross section becomes circular or elliptical.
A part of the strand or glass filament containing water and the processing liquid is joined. Furthermore, the rounding of the CSs also has the effect of averaging the unit weight and size of each CS. As a result, the produced C
S can be a substantially cylindrical or substantially elliptical body whose end face comprises a plane substantially perpendicular to the longitudinal axis direction. The granulation method using the spiral vibration trough is granulated in comparison with a granulation method using a rotating drum in which the cross section of the CS is uneven or a granulation method using a linear vibration trough described below in which the end surface of the CS is inclined. It is possible to make the grain size of the entire CS uniform, and the outer edge of the CS end face is in a plane that is almost perpendicular to the longitudinal axis direction, so when the CSs come into contact with each other or when the CS and the trough come into contact, it fuzzes It is excellent in that cracking and yarn cracking hardly occur. As described above, when the spiral vibration trough device 26 is used, the outer peripheral portion of the CS end surface is in a plane substantially perpendicular to the longitudinal axis direction.
It is considered that the outer surface of the end surface comes into contact with the side surface and the bottom surface of the trough while rotating during the granulation process.

The spiral vibrating device 26 has a first outlet 32, a second outlet 33, and a third outlet for taking out CS at the uppermost position, the upper middle position, and the lower middle position, respectively. 34. These outlets 31, 3
By selectively using 2, 33, the moving distance of the CS on the trough 17 can be adjusted.

First outlet 32, second outlet 3
Third, the CS taken out through one of the third taking-out ports 34 is conveyed to the container 36 by the belt conveyor 35. The CS is dried by the hot-air dryer 37 during the transportation.

In the CS granulator of FIG. 2, the strand is wound up, the strand is pulled out from the dried cake 21, and the strand is sprayed with water or a treatment liquid, wetted, and then cut into CS. However, once the strand is wound on the cake 21, the strand may be immediately pulled out from the cake without drying after drying, and cut into CS, or the spun strand may be cut directly without winding as the cake 21.

In the above embodiment, the strand is spun from the glass filament 11,
This glass filament 11 can be replaced with various organic fibers conventionally processed into CS.

[0048]

EXAMPLES (1) Example 1 Glass filament 11 drawn from bushing 10
Is coated with a binder by a binder applicator 12 and then uniformly spread over the glass fragment 11 having an average diameter of 13 μmφ.
And traverse it with the traverse fingers 16 and wind them up as a cake 21. After fifteen strands from fifteen such cakes 21 are bundled as a strand bundle by a focusing guide 22, water or a treatment liquid is sprayed on the strand bundle by a spraying device 23 so as to be in a wet state with a water content of 10%. ,
It was cut to a length of 3 mm by the cutting device 24.

Next, the cut CS is put into the trough 28 from the lower part of the spiral vibration trough device 26 in a wet state with a water content of 10%, and the frequency of the trough 28 is 1800 c.
The cut CS was moved three rounds (moving distance of about 9 m) on the trough 28 while imparting a rolling vibration action having an amplitude of 1.5 mm / min and the CS was gradually granulated. Then, it dried with the hot air dryer 37 and obtained desired CS. The binder adhesion was 0.9%.

With respect to the obtained CS, the particle size (mesh size 42
A ratio of 5 μm mesh or less, a mesh of 4000 μm mesh or more), a compression ratio, a bridge occurrence frequency, and the presence or absence of occurrence of unspread of the molded product were examined.

The particle size is determined by determining an appropriate particle size of CS with an opening of 425.
As a mesh of 〜4000 μm, the ratio (%) of mesh size per unit weight of CS is 425 μm mesh (# 36 mesh) or less, and the ratio (%) is mesh size of 4000 μm mesh (# 4.7 mesh) or more.

The compression ratio was calculated from the compressed bulk density and the natural bulk density using the following formula: compression ratio (%) = (compressed bulk density−natural bulk density) / compressed bulk density (× 100). here,
As the compressed bulk density, the value of the bulk density after applying vibration 50 times by tapping was adopted.

The frequency of occurrence of bridges is as follows.
When 2 kg of CS was put into a mφ hopper, the frequency of occurrence of bridges at the time of discharge (during 10 measurements) was measured.

The presence or absence of occurrence of unspread of the molded article is determined by the obtained C
It was visually determined whether or not unopened fibers occurred in the molded article molded by S. Table 1 shows the results.

[0055]

[Table 1]

In Example 1, when the cut length of CS is 3 mm, 0.5% by weight of particles having a mesh size of 4000 μm or more is 0.5% by weight or less and 3% by weight or less of particles having a mesh size of 425 μm or less. It was 0.0% by weight. Also, the compression ratio is as low as 3.5%, so that the frequency of occurrence of bridges is zero.
This is the number of times, and no unspreading of the molded article occurred.

(2) Comparative Example 1 In Example 1, the number of converging glass filaments 800 was changed to 2000, the spiral vibration trough device 26 was changed to the linear vibration trough device shown in FIG. An experiment was performed in the same manner as in Example 1.

In FIG. 4, a linear vibration trough device 40 is shown.
Is composed of a linear trough 41 having a length of 10, and weirs 42 installed at three locations at equal intervals in the longitudinal direction of the trough 41,
The trough 40 is installed on a bed via an elastic body 43. A longitudinal vibration is applied to the trough 41 and the weir 42 by a vibration generator (not shown). This allows
CS in the trough 41 is rolled into the trough 4 by the action of rolling vibration.
1 Roll forward and move forward.

The CS in the trough 41 is prevented from moving forward by the weir 42 and continues to be inverted until it overflows before the weir 42. By continuing this reversal, rounding progresses,
While the cross-sectional shape becomes substantially circular or substantially elliptical, a part of the strand or filament containing water or the treatment liquid is joined. Further, by rounding the CSs, the effect of averaging the unit weight and the size of each CS also has a certain effect.

Table 1 shows the results. In Comparative Example 1, when the cut length of CS is 3 mm, grains having a mesh size of 4000 μm or more are 4.0% by weight, 3% by weight or more, and the mesh size is 42%.
Grains having a mesh size of 5 μm or less accounted for 3% by weight or less of 1.2%. The compression ratio was 20.5%, and the frequency of occurrence of bridges was eight. However, no unspreading of the molded product occurred.

In Comparative Example 1, the reason why the frequency of occurrence of bridges increased to eight was that the number of converging glass filaments was 20
Since the number of CSs was larger than that of Example 1, and CS was conveyed by a linear vibration trough device, the number of openings of CS was 4
This is because the ratio of mesh having a mesh size of 25 μm or less was increased to 4.0% by weight, and the compression ratio was increased to 20.5%.

(3) Comparative Example 2 CS was manufactured in the same manner as in Example 1. However, the adhesion ratio of the binder was 3.0%.

Table 1 shows the results. In Comparative Example 2, when the cut length of CS is 3 mm, grains having a mesh size of 4000 μm or more are 5.0 wt% of 3 wt% or more, and the mesh size is 42 wt%.
0.5% by weight of particles having a mesh size of 5 μm or less being 3% by weight or less
Met. The compression ratio was rather high at 15.3%, and the frequency of occurrence of bridges was three. In addition, unopened molded articles occurred.

In Comparative Example 2, the reason why the frequency of occurrence of bridges was three was that the ratio of CS having meshes of 4000 μm or more was 5.0% by weight because CS was as high as 3.0%. And the compression ratio is 15.5%
And higher than in the first embodiment.

As shown in Table 1, when CS is conveyed by the spiral vibration trough device 26 (Example 1), the compression ratio is reduced compared to when CS is conveyed by the linear vibration trough device (Comparative Example 1). And the occurrence frequency of bridges can be reduced, and when CS is conveyed by the spiral vibration trough device 26, when the cut length of CS is 3 mm, the aperture is 4000 μm.
3% by weight or less of mesh or larger grains and 425 μm aperture
When the particles having a mesh size of not more than 3% by weight (Example 1), the particles having a mesh size of 4000 μm or more are 3% by weight or more or the particles having a mesh size of 425 μm or less are 3% by weight or less (Comparative Example 2) It can be seen that the compression ratio can be reduced as compared to the case of (1), thereby reducing the frequency of occurrence of bridges.

[0066]

As described above in detail, according to the manufacturing method of the first aspect, the chopped strand is conveyed while imparting a rolling vibration action on a spiral path whose central axis is oriented in the vertical direction. Therefore, the chopped strand can be formed into a substantially cylindrical body or a substantially elliptical cylindrical body whose outer surface at the end face is in a plane substantially perpendicular to the longitudinal axis direction. As a result, the grain size of the entire chopped strand can be uniformed. This makes it possible to reduce the compression ratio and prevent the so-called bridge phenomenon from occurring.

According to the manufacturing method of the present invention, the rolling vibration has a frequency of 600 to 6000 c / min and an amplitude of 1 to 10 mm. The moving distance can be made appropriate.

According to the manufacturing method of the third aspect, 100
Since the chopped strand is obtained by cutting a strand consisting of up to 1000 glass filaments into a predetermined length, the effect of the manufacturing method according to claim 1 can be reliably achieved.

According to the fourth aspect of the present invention, the chopped strand is conveyed while imparting a rolling vibration action on the spiral path having the central axis oriented in the vertical direction. The part can be formed in a substantially cylindrical body or a substantially elliptical cylindrical body that is in a plane substantially perpendicular to the longitudinal axis direction, and as a result, it is possible to uniform the grain size of the entire chopped strand, thereby reducing the compression ratio That is, the occurrence of a so-called bridge phenomenon can be prevented.

According to the manufacturing apparatus of the fifth aspect, the rolling vibration action has a frequency of 600 to 6000 c / min and an amplitude of 1 to 10 mm. The moving distance can be made appropriate.

According to the manufacturing apparatus of the sixth aspect, 100
Since the chopped strand is obtained by cutting a strand composed of up to 1000 glass filaments into a predetermined length, the effect of the manufacturing apparatus according to claim 5 can be reliably achieved.

According to the chopped strand according to the seventh aspect, the chopped strand is formed of a substantially cylindrical body or a substantially elliptic cylindrical body whose outer surface at the end face is in a plane substantially perpendicular to the longitudinal axis direction. It is possible to make the particle sizes uniform, thereby reducing the compression ratio and preventing the so-called bridging phenomenon from occurring.

According to the chopped strand of the eighth aspect, 3% by weight of grains having an opening of 4000 μm mesh or more.
3% by weight of particles having a mesh size of 425 μm or less
Because of the following, the compression ratio is reduced, and the occurrence of a so-called bridge phenomenon can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a strand manufacturing apparatus in a CS manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a CS granulator in a CS manufacturing apparatus according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a trough 17 in the granulator for CS shown in FIG. 2;

FIG. 4 is an explanatory view of a linear vibration trough device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bushing 11 Glass filament 12 Binder applicator 15 Reinforcement pad 17 Collet 21 Cake 22 Focusing guide 23 Spraying device 24 Cutting device 25 Chop 26 Spiral vibration trough device 31 Elastic body 35 Belt conveyor 37 Drying device

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshitaka Furuichi 3-5-11 Doshomachi, Chuo-ku, Osaka-shi, Osaka F-term in Nippon Sheet Glass Co., Ltd. 4F201 AB25 AB28 AD04 BA01 BC03 BC17 BD04 BL08 BL28 BL44 BQ14

Claims (8)

[Claims] 1. A method for manufacturing a chopped strand, comprising a transporting step of transporting a chopped strand on a spiral path having a central axis oriented in a vertical direction while imparting a rolling vibration action. 2. The rolling vibration effect has a frequency of 600.
The method for producing a chopped strand according to claim 1, wherein the amplitude is 1 to 6000 c / min and the amplitude is 1 to 10 mm. 3. The production of a chopped strand according to claim 1, further comprising a cutting step of obtaining the chopped strand by cutting a strand composed of 100 to 1000 glass filaments into a predetermined length. Method. 4. A manufacturing apparatus for chopped strands, comprising: a conveying means for conveying the chopped strands on a spiral path having a central axis oriented in a vertical direction while imparting a rolling vibration action. 5. The rolling vibration effect has a frequency of 600.
The apparatus for producing chopped strands according to claim 4, wherein the amplitude is 1 to 6000 c / min and the amplitude is 1 to 10 mm. 6. The production of a chopped strand according to claim 4, further comprising cutting means for obtaining the chopped strand by cutting a strand consisting of 100 to 1000 glass filaments into a predetermined length. apparatus. 7. A chopped strand manufactured by the method for manufacturing a chopped strand according to any one of claims 1 to 3, wherein an outer surface of an end face is substantially in a plane substantially perpendicular to a longitudinal axis direction. A chopped strand comprising a cylindrical body or a substantially elliptical cylindrical body. 8. The chopped strand according to claim 7, wherein particles having a mesh size of 4000 μm or more account for 3% by weight or less and particles having a mesh size of 425 μm mesh or less account for 3% by weight or less.