JP2002018837A - Apparatus for granulating thermosetting resin molding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for continuously producing a thermosetting resin molding material in which occurrence of a fine powder is low. SOLUTION: The apparatus for granulating the thermosetting resin molding material comprises a pressure roll (A) for rolling the molding material of a molten state in a predetermined thickness, grooving rolls (B) for processing the rolled molding material in a wheat flour state of a predetermined width or processing in a rugged sheet-like state having cutouts of a predetermined interval, and a cutter blade or grooving rolls (C) for cutting the molding material processed in the wheat flour state or the rugged sheet-like state in a predetermined length. The rolls (B) have one set of rolls of two or more in such a manner that at least one roll has a cutter blade shape having a sectional rectangular, triangular or semicircular groove in the apparatus for manufacturing the thermosetting resin molding material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a granular molding material by melting and kneading a thermosetting resin molding material such as a phenol resin, and then continuously granulating the molding material. The present invention relates to a blade shape of a grooving roll for cutting into a noodle shape, and provides an apparatus for continuously producing a thermosetting resin molding material with less generation of fine powder.

[0002]

2. Description of the Related Art Conventionally, thermosetting resin molding materials are generally mixed, kneaded, cooled and then taken out in blocks or sheets after compounding the raw materials, and then crushed to a certain particle size after cooling. . The fine powder generated at the time of pulverization and after the production lowers the yield, and the fine powder generated by vibration during transportation after packaging and shipping is floating as dust at the time of handling, which is not preferable for environmental hygiene. Granulation of a thermosetting resin molding material by an extrusion granulator is preferable from the viewpoint of environmental hygiene, since the generation of fine powder is relatively small, but productivity is low and improvement thereof is desired.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention is to roll a molding material to a constant thickness with a rolling roll, and to maintain a proper temperature while maintaining a proper width by using a grooving roll. Shape or irregularity processing, and then, when continuously cutting to a predetermined length with a cutter blade or grooving roll, by setting the blade shape of the grooving roll to a specific shape, an arbitrary particle size It is an object of the present invention to provide a thermosetting resin molding material granulating apparatus which is capable of continuous operation for a long time at the same time as obtaining the molding material and has good productivity.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a rolling roll (A) for rolling a molten molding material to a predetermined thickness, a method of processing the rolled molding material into a noodle shape having a predetermined width, or a predetermined interval. A groove cutting roll (B) for processing into an uneven sheet shape having a notch, and a cutter blade or a groove cutting roll (C) for cutting a molding material processed into a noodle-like or uneven sheet shape into a predetermined length. In the apparatus for producing a thermosetting resin molding material, the groove-cutting roll (B) is composed of a set of two or more rolls, and at least one of the rolls has a quadrangular, triangular or semicircular groove. The present invention relates to a granulating apparatus for a thermosetting resin molding material, which has a blade shape having the following.

Hereinafter, the present invention will be described with reference to the drawings.
Each drawing shows a specific example of the granulating apparatus used in the present invention. FIG. 1 is a schematic front view, and FIGS. 2 and 3 are schematic perspective views. The specific equipment used in each step can be appropriately selected according to the desired particle size of the molding material, the compounding formula, the amount of volatile components, the temperature during each processing, the target processing capacity of the apparatus, and the like.

The thermosetting resin molding material 1a in the molten state is
It is rolled to a predetermined thickness by the rolling roll 2. The rolling roll 2 has a scraper 5a for forcibly removing the rolled molding material from the roll. Subsequently, it is processed into a noodle shape having a predetermined width or an uneven sheet shape having cuts at predetermined intervals by the groove cutting roll 3a. The grooving roll 3a is provided with a scraper 5b for forcibly peeling the molding material 1b processed into a noodle shape or an uneven sheet shape from the grooving roll 3a. Further, as shown in FIG.
A pair of grooving rolls 3a, 3a or a combination of the grooving roll 3a and the cutting board roll 3b can be selected.

Further, the molding material 1b processed into the noodle shape or the uneven sheet shape is cut to a predetermined length by a cutter blade or a groove cutting roll 4a while maintaining the softness required for cutting. In this process, as the cutting length becomes smaller, the molding material is more likely to adhere to the cutter blade and the groove cutting roll 4a and to cause clogging. Since the cutter blade or the grooving roll 4a cannot be provided with a scraper for forcibly removing the cut molding material, the clogging is performed by cooling the surface of the cutter blade or the grooving roll with air or cold air. Can be prevented. Further, the cutter blade or the grooving roll 4a is combined with the cutting board roll 4b, the cutting board roll is provided with a scraper 5c, and the cutting board roll is heated so that the molding material cut by the grooving roll is once adhered to the cutting board roll. Then, clogging of the grooving roll can be prevented.

Next, the shape of the grooving roll (B), which is a feature of the present invention, will be described. Grooving roll (B)
Consists of a set of two or more rolls, at least one of which rolls has a square, triangular or semicircular cross section, but usually a set of two. As shown in FIG. 4, a specific example of this blade shape is a shape in which only one of a pair of rolls has a groove, a shape having a semicircular groove (a), and a triangular groove. (B) having
A shape (c) having a groove having a rectangular cross section, as shown in FIG. 5, both of the two rolls have a continuous groove, and both grooves are opposed to each other, and each roll has a half cross section. A shape having a circular groove (a), a shape having a triangular groove (b), or as shown in FIG. 6, both sets of two rolls alternately have grooves and non-grooves at the same pitch. (A) having a semicircular groove, (b) having a triangular groove, and (b) having a triangular groove ( c), a shape having a groove having a rectangular cross section, and a non-groove portion of one roll biting into a groove portion of the other roll (d).

In the above-mentioned shape, the case of FIG. 4 is a combination of a grooving roll and a cutting board roll, and although the processing ability is inferior, the load on the scraper for forcibly removing the molding material during the processing is reduced. It can be reduced, and it is excellent in terms of roll processing cost and equipment management. In the case of FIGS. 5 and 6,
A combination of two grooving rolls, which is excellent in that the processing capacity can be increased. Among them, processing into a groove having a circular cross section as shown in FIG. 5A is the most preferable since the fine powder is hardly generated in the subsequent steps. The blade shape, the width between the grooves, the pitch, and the like are processed according to the desired shape of the molding material. The particle size of the molding material varies depending on the shape, size, molding method and the like of the molded article using the molding material, but is generally in the range of 1 to 5 mm. 1.0 to 2.5 mm is preferable for injection molding requiring precision.

In the granulating apparatus according to the present invention, predetermined processing is continuously performed by widthwise processing with the grooving roll (B) having the above-mentioned specific shape and lateral cutting with a cutter blade or grooving roll (C). The resulting molding material has a feature that the obtained molding material has a smooth particle end surface, does not easily collapse by a shock, vibration, friction, or the like during a post-process or transfer, and hardly generates fine powder.

The thermosetting resin used in the present invention is typically a phenol resin, but may be an epoxy resin, a polyimide resin, a polyester resin, or the like. In the case of a novolak phenolic resin, hexamethylenetetramine is generally used as a curing agent, but is not limited thereto. Examples of fillers include glass fibers, calcium carbonate, clay, mica, and silica for inorganic substances, and wood powder, pulp, woven fibers, and cured thermosetting resins for organic substances.

[0012]

EXAMPLES 34 parts by weight of a powdery phenol resin, 6 parts by weight of a powdery curing agent (hexamethylenetetramine), 55 parts by weight of an inorganic base material (glass chop, clay), and other additives (curing aids, 5 parts by weight of a releasing agent and a coloring agent) were mixed by a blender and then melt-kneaded by a heating roll.
This was immediately charged into a rolling roll having a temperature of 80 ° C. and a roll gap of 2 mm and rolled. Subsequently, the noodles were continuously supplied to two grooving rolls (shape shown in FIG. 5 (a), roll gap 0 mm) having a semicircular groove (diameter: 2 mm, groove pitch: 2 mm) equipped with a scraper. Processed into a shape,
Further, the noodle-like molding material was blown with compressed air, and cooled. A sandwich cutting process was performed. The obtained granular molding material is reduced to 1 by a rotary small mixer.
Treated for 5 minutes. Next, the particles were sieved with a vibrating sieve and the particle size distribution was confirmed. As a result, 95% of the particles had a particle size of 1 to 2 mm and 1% or less of fine powder having a particle size of 180 μm or less.

[0013]

According to the apparatus for producing a thermosetting resin molding material of the present invention, the generation of fine powder, which has been generated by 10% or more in the conventional production method, can be reduced to the utmost, and the continuous molding material can be produced. Granulation can be performed stably for a long time. Therefore, the product yield can be greatly improved, and this is also preferable in terms of environmental hygiene. Since the equipment is simple and compact, the equipment investment can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a granulator (one example) using the present invention.

FIG. 2 is a schematic perspective view of a granulator (one example) using the present invention.

FIG. 3 is a schematic perspective view of a granulating apparatus (another example) using the present invention.

FIG. 4 is a partial front view showing a blade shape (an example) of a grooving roll.

FIG. 5 is a partial front view showing a blade shape (another example) of a grooving roll.

FIG. 6 is a partial front view showing a blade shape (another example) of a grooving roll.

[Explanation of symbols]

1a Heat-kneaded, molten thermosetting resin molding material 1b Thermosetting resin molding material processed into a noodle shape or uneven sheet shape in the width direction 1c Thermosetting resin molding material cut into a length direction 2 Rolling roll 3a Grooving roll 3b Cutting board roll 4a Cutter or grooving roll 4b Cutting board roll 5a Scraper 5b Scraper (grooving) 5c Scraper

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F201 AA37 AA39 AA40 AB03 AB12 AB25 AM32 BA02 BC02 BC12 BC37 BL07 BL08 BL37 BL38 BM07

Claims (6)

[Claims] 1. A rolling roll (A) for rolling a molten molding material to a predetermined thickness, processing the rolled molding material into a noodle shape having a predetermined width, or forming an uneven sheet having cuts at predetermined intervals. Thermosetting resin molding material having a grooving roll (B) for processing, and a cutter blade or grooving roll (C) for cutting a molding material processed into a noodle-like or uneven sheet shape into a predetermined length. The grooving roll (B) comprises a set of two or more rolls, and at least one of the rolls has a blade shape having a square, triangular, or semicircular groove. A granulator for thermosetting resin molding materials. 2. The apparatus for granulating a thermosetting resin molding material according to claim 1, wherein two grooving rolls (B) are provided, one of which has the blade shape. 3. The apparatus for granulating a thermosetting resin molding material according to claim 1, wherein two grooving rolls (B) are provided in a set, and both of the grooving rolls (B) have the blade shape. 4. The granulating apparatus for thermosetting resin molding materials according to claim 3, wherein the grooves of both rolls face each other. 5. The thermosetting resin molding according to claim 3, wherein both rolls have grooves and non-grooves alternately at the same pitch, and the groove of one roll and the non-groove of the other roll face each other. Material granulator. 6. The apparatus for granulating a thermosetting resin molding material according to claim 5, wherein the groove has a quadrangular cross section, and the non-groove portion of one roll has a shape biting into the groove portion of the other roll.