JPH11217233A - Crushing of inorganic fiber material and crushing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for crushing an inorganic fiber material by continuously feeding the inorganic fiber material between a pair of rolls rotated in mutually opposite directions and crushing the fed inorganic fiber material by the press force of the rolls, capable of continuously and efficiently crushing the inorganic fiber material such as glass wool and controlling the glass fibers contained in the obtained crushed product in a desired shape. SOLUTION: This method for crushing an inorganic fiber material such as glass wool comprises crushing the glass wool between a pair of a main roll 3 and the first sub-roll 4 and subsequently feeding the obtained coarsely crushed glass wool between the other pair of the main roll 3 and the second sub-roll 4' rotated in the arrow direction. When passing between the rolls 3, 4', the fed coarsely crushed glass wool again receives a press force. The coarsely crushed pieces insufficiently crushed between the first pair of the rolls 3, 4 are thereby sufficiently crushed. A clearance between the rolls 3, 4' is maintained at a distance of 0.1-1.0 mm without relating to the METSUKE of the crushed glass wool, and the aspect ratio of the crushed fibers can thereby be controlled to 6-125.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pulverizing an inorganic fiber material, and more particularly to a method for pulverizing an inorganic fiber useful as a raw material for producing an inorganic fiber material, such as an inorganic fiber filler or reinforcing material used for various applications. The present invention relates to a method for pulverizing an inorganic fiber material such as glass wool capable of efficiently providing a pulverized material.

[0002]

2. Description of the Related Art In recent years, a large amount of inorganic fiber materials such as glass wool and rock wool have been used for walls, attics, under floors, ceilings, and the like for the purpose of improving sound absorption and heat insulating properties and cushioning of buildings. It is used as a heat insulating material for various facilities other than general buildings and a heat insulating material for various vehicles. Of these inorganic fiber materials, glass wool is generally used during the production of glass fibers, after adding an appropriate amount of a binder such as phenolic resin to the produced glass wool, laminating, compressing to a certain density, and then curing and curing. Through a drying process, it is formed into a predetermined shape, and a surface material is applied as necessary to obtain various products.

[0003] In the production of a molded article made of an inorganic fiber material such as glass wool as described above, a large amount of offcuts are generated in the manufacturing process, and in some cases, defective products are also generated. Good products need to be collected and recycled for reuse. In addition, from the viewpoint of environmental considerations in recent years, there is a strong demand that inorganic fiber material products such as glass wool used in buildings and other applications be collected and reused when dismantling buildings, factories, vehicles, etc. Have been.

[0004] As for the collection and reuse of the inorganic fiber material molded product such as glass wool as described above, the recovered inorganic fiber material such as glass wool is mainly crushed to an appropriate size to obtain various building materials and synthetic resin composite materials. There are uses for use as fillers and reinforcing materials, and uses for raw materials for producing inorganic fiber materials such as glass wool, for example, as recycled cullet.

[0005] As a conventional method for pulverizing scraps of inorganic fiber material products such as glass wool collected as described above, defective products or used inorganic fiber material products such as glass wool, inorganic fiber materials such as recovered glass wool are used. A method of cutting inorganic fibers such as glass wool in an aqueous medium and cutting the fibers to a predetermined length by vigorously stirring an inorganic fiber material in an aqueous medium, removing members other than glass fibers such as surface materials as necessary from a material product, etc. A method using a pulverizer (impact pulverization, ball mill, hammer mill, etc.) and a method of repeating pressurization and depressurization are known.

[0006]

However, in the above-mentioned conventional pulverizing method, there are various problems in the process time in the pulverization, the fiber form of the obtained pulverized material, and the like. That is,
Inorganic fibers such as glass wool supplied from a fiber manufacturing device are relatively large in length, and are usually lumped because they are entangled in a state of being bound by a binder. For this reason, wet pulverization in an aqueous medium stirs an inorganic fiber material such as glass wool in water, so that the glass fibers are easily entangled in a spherical shape to form a lump. There is a problem that the above-mentioned lumps cause clogging in the pipe and the grinding process is often interrupted.

[0007] In the case of pulverization by a general pulverizer (impact pulverization, ball mill, hammer mill, etc.), the aspect ratio of the pulverized material becomes extremely small because the fiber filament is crushed or broken. There is no problem when using as a filler, but when using as a reinforcing material, there is a problem that a reinforcing effect is hardly obtained.

A method of pulverizing an inorganic fiber material such as glass wool by applying pressure is also known (Japanese Patent Application Laid-Open No. Sho 62-62).
However, this method is a method in which pressurization and depressurization are repeated, which requires a very large pressure, requires equipment costs, has low productivity, and has a large mass of inorganic fiber material such as glass wool. Since the fiber density at the end is lower than that at the center, pressure is not applied to this end during pressurization and compression, so that pulverization is not possible. It cannot be used as a material.

As described above, all of the conventionally known methods are batch-type pulverization methods. Therefore, the inorganic fiber material such as glass wool to be pulverized must be cut into an appropriate size in advance. In spite of the large total equipment cost, the production efficiency (pulverization efficiency) is low, and the particle shape of the obtained pulverized material has a serious problem.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, to continuously and efficiently pulverize an inorganic fiber material such as glass wool, and to form glass fiber in the obtained pulverized material. To provide a pulverizing method and a pulverizing apparatus for an inorganic fiber material such as glass wool from which a pulverized material which can be controlled to a desired shape and is thus useful as a filler or a reinforcing material and also as a raw material of recycled cullet is obtained. It is.

[0011]

The above object is achieved by the present invention described below. That is, the present invention is characterized in that the inorganic fiber material is continuously supplied between a pair of rolls rotating in opposite directions, and the inorganic fiber material is pulverized by the pressing force of the pair of rolls. A pulverizing method and a pulverizing device for an inorganic fiber material.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to embodiments of the present invention. The inorganic fiber material used in the present invention is an inorganic fiber material (hereinafter simply referred to as glass wool) such as rock wool, glass wool, and glass mat, and usually has a fiber diameter of 3 to 15 μm and a density of 10 to 200 k.
g / m ³ fiber material, usually in the form of a mat, felt, board, lump, molded product or the like, and a surface material may be affixed to the surface. As described above, these glass wools are preferably scraps generated during the production of glass wool products, defective products, or glass wool products collected from the market, but when the purpose is high quality filler or reinforcing material In addition, unused glass wool produced in a factory may be used.

The method and the apparatus for pulverizing glass wool as described above will be described with reference to the drawings. The example shown in FIG. 1 is a method and an apparatus for coarsely pulverizing glass wool among the methods and apparatuses of the present invention, and is effective when relatively coarse particles may be used as a pulverized product. In this example, glass wool W is continuously supplied between a pair of rolls composed of a main roll 3 and a sub roll 4 rotating in opposite directions, and the glass wool W is pulverized by the pressing force of the pair of rolls. In this method, a conveying means (belt conveyor 1) moving in the direction of the arrow with a width substantially equal to the width of the pair of rolls 3 and 4 rotated in the direction of the arrow by the drive motor 5 is shown.
On top, the glass wool W is continuously supplied. At this time, the supplied glass wool is adjusted to have a width smaller than the width of the rolls 3 and 4. That is, the dimensions of glass wool are
As long as the width is equal to or less than the width of the rolls 3 and 4, there is no problem, and the length and thickness of the fiber material are not limited.
Can be used continuously as it is if it is a flat plate wound in a roll shape.

The glass wool supplied on the belt conveyor 1 is compressed to a predetermined thickness by a consolidating means (pressing belt 2) moving in the direction of the arrow before being bitten by the rolls 3 and 4 as it progresses. By this pressing, the thickness of the glass wool is determined in relation to the basis weight of the glass wool and the clearance between the rolls 3 and 4. That is, the thickness is such that the pressed glass wool can be sufficiently pressed between the rolls 3 and 4 by the rolls 3 and 4 and can pass between the rolls 3 and 4. The individual fibers constituting the glass wool are pressed against each other by the pressure applied when the glass wool passes between the rolls 3 and 4, whereby the individual fibers are finely broken and pulverized.

After passing between the rolls 3 and 4, the crushed glass wool falls into a lower feeder 6 to be collected and transported to a predetermined place by a pneumatic transport pipe 7. Even if a material other than fibers adheres to the glass wool, such as a surface material attached to the glass wool, only the fibers are pulverized, and only the pulverized fibers are sucked into the pipe and sucked into the pipe, and foreign substances such as the surface material are removed. Gather at the bottom of the feeder,
It may be removed at an appropriate time. Incidentally, as shown in FIG. 1, a suitable vibrating screen 8 may be provided in the middle of the feeder to automatically remove foreign matter that has not been crushed.

FIG. 2 is a view for explaining a further preferred method and apparatus of the present invention. In the example shown in FIG. 2, the glass wool ground in the example shown in FIG. And pulverize. The example shown in FIG. 1 is suitable for coarse grinding of glass wool, but in the example shown in FIG. 1, when the density of the glass wool to be ground is not uniform in the width direction on the supply belt 1, the low density portion is sufficient. When the glass wool is pressed by the pressing belt 2, the end of the glass wool may have a lower density than the central portion, and similarly, the end of the glass wool may be pressed. In some cases, the pulverization of the pulverized product is insufficient, and the particle size distribution of the pulverized product may be inappropriate depending on the application. In the example shown in FIG. 2, the above-described problem is sufficiently solved, and a finely pulverized product that does not include a coarse pulverized product can be obtained.

That is, the coarsely ground glass wool that has been pulverized between the main roll 3 and the first sub-roll 4 is separated into another pair of main rolls 3 and the second sub-roll 4 ′ rotating in the direction of the arrow. The coarsely pulverized material is again subjected to a pressing force when passing between the rolls 3 and 4 ′, whereby pulverized fragments that were insufficiently pulverized between the first pair of rolls 3 and 4 are removed. Finely pulverized. In the example shown in FIG. 2, the positional relationship between the main roll 3, the first sub-roll 4, and the second sub-roll 4 ′ is such that the center-core angle α between the rolls is Almost 90
Although the angle is in degrees, this angle is not essential, and as shown in FIG. 3, the positional relationship between the main roll 3, the first sub-roll 4, and the second sub-roll 4 '
The core angle α may be any angle within an allowable range (for example, 45 degrees as shown in FIG. 3).

The glass wool W supplied on the conveyor belt 1 in the above-mentioned apparatus may be supplied as a continuous body such as a plate or a futon as shown in FIGS. As shown in FIG. 3, there is no problem even if an arbitrary size is used, for example, a discontinuous material such as a product scrap. After being pulverized by the main roll 3 and the second sub-roll 4 ', it is the same as in the case of FIG. Therefore, in the example shown in FIGS. 2 and 3, the rolls 3 and 4 have a coarse grinding function, and the rolls 3 and 4 ′
Exerts a fine grinding function. In the example shown in FIGS. 2 and 3, the roll 3 is common to the pair of rolls 3, 4 and 3, 4 '. However, the apparatus of the present invention is not limited to these examples. And two roll pairs 3, 4 as shown in
A combination of 3 ′ and 4 ′ may be used, and three or more roll pairs (not shown) may be used. In these examples, it is desirable that the positional relationship between each pair of rolls is located lower in the downstream of the pulverizing step from the relation of the flow of the pulverized material.

The rolls 3, 4 and the like used in the present invention as described above are preferably made of, for example, carbon tool steel (SK material) as a constituent material in order to have sufficient strength at the time of pulverization. When the glass wool is pulverized over a long period of time, the surface of each roll is worn away by abrasion. Therefore, it is preferable to harden the surface of the roll and then apply hard chrome plating. When the weight of the glass wool to be crushed is high, the clearance between the rolls is widened, and the pressure between the rolls may not be applied to the glass wool between the rolls. Is desirable. The rotation of the main roll 3 is controlled by a reduction motor 5 via a chain belt.
, The output of the motor is preferably 2.0 kW or more, and the reduction ratio is preferably 1:50 or more. In consideration of the productivity of the pulverization, the peripheral speed of the roll 3 is 10 to 30 m / sec. Is desirable.

The rotation of the sub rolls 4 and 4 ′ can be driven by the rotation of the main roll 3. Further, in consideration of the pulverizing efficiency and workability, the dimensions of the roll are preferably such that the main roll 3 has a diameter of 300 mm and a length of 1,200 mm or more. The sub-rolls 4 and 4 'are 200 mm in diameter and 1 and 2 in length.
It is desirably 00 mm or more. Therefore, the width of the glass wool to be ground is preferably adjusted to a width corresponding to the roll length, that is, a width narrower by about 50 to 100 mm at both ends in the width direction than the roll length.

In the above method, the relationship between the clearance between the pair of rolls 3 and 4 and the basis weight of the glass wool supplied to the clearance is also important. That is, roll 3,
If the clearance of No. 4 is too small, the productivity of the pulverized material is low. On the other hand, if the clearance is too large, the pulverizing force of the rolls 3 and 4 decreases, and sufficient pulverization is not performed. For example, in the preferred embodiment shown in FIGS. 2 and 3, the clearance of the coarse grinding rolls 3, 4 should be determined in relation to the basis weight (weight per unit area) of the glass wool to be ground. Generally, it is preferable that the clearance between the rolls 3 and 4 is 2 to 5 mm, and the basis weight of the inorganic fiber material supplied to the clearance is 0.5 to 5.0 g / cm ² .

[0022] and more specifically suitably 2~3mm when basis weight is 2 kg / ^{m 2,} the basis weight of glass wool more, for example, in the case of 3-5 kg / ^{m 2} clearance Is about 3 to 5 mm. When using a glass wool having a low basis weight, pulverization can be carried out by appropriately adjusting the basis weight of the glass wool by overlapping the glass wool with a low basis weight according to the roll clearance. Empirically, the preferred relationship between the clearance of the coarse crushing rolls 3 and 4 and the weight of the glass wool was in the range of clearance / weight = 0.9 to 2.0.

The clearance between the fine grinding roll pair 3 and 4 'is independent of the basis weight of the ground glass wool.
It is in the range of 0.1 to 1.0 mm, preferably 0.3 to 0.5 mm. By crushing under such conditions, the aspect ratio of the finally obtained crushed fiber can be adjusted to the range of 6 to 125, the aspect ratio is 40 to 70 in the preferable range, and the 3 to 10 cm in Blaine value. ² /
g of ground fiber.

In the above description, the grinding of glass wool has been described. However, when the fiber material to be ground is other inorganic fiber material such as rock wool, the method and apparatus of the present invention require that the material pass between a pair of rolls. The relationship between the clearance between the pair of rolls and the basis weight of the inorganic fiber material is determined by the type of fiber to be pulverized and the degree of intersection of the fiber filaments.

[0025]

Next, the present invention will be described more specifically with reference to examples and comparative examples. Example 1 First, as a fiber material, a fiber diameter of 8 μm and a fiber length of several mm to
Bulk density 80kg / m made of 400mm short glass fiber
^3. A board-shaped glass wool molded product having a size of 1,800 × 900 mm and a thickness of 25 mm (manufactured by Asahi Fiberglass Co., Ltd., Hylerton PF, trade name, with surface material, basis weight 2 kg / m)
² ) was prepared and crushed under the following conditions using a crusher shown in FIG.・ Roll 3 = 300 mm in diameter, roll length = 1,200
mm Rolls 4 and 4 ′ = 200 mm in diameter, roll length =
1,200 mm ・ Material of each roll: hard chromium-plated carbon tool steel (SK material) ・ Circumferential speed of rolls 3, 4, 4 ′ = about 13 m / min. -Clearance of rolls 3 and 4 = 3 mm-Clearance of rolls 3 and 4 '= 0.5 mm-Gap between supply belt 1 and presser belt 2 = 15 mm

Example 2 First, as a fiber material, a fiber diameter of 8 μm and a fiber length of several mm to 4 mm were used.
A used lump of glass wool (Blow Ace, manufactured by Asahi Fiberglass Co., Ltd.) having a thickness of 00 mm and a bulk density of about 18 kg / m ³ was prepared, and crushed using a crusher shown in FIG. 3 under the following conditions. -Core-core angle between main roll 3 and sub-roll 4 = 45 degrees from horizontal position-Gap between supply belt 1 and presser belt 2 = 5 mm-Tip position of supply belt 1 = perpendicular to axis of main roll 3-Others Are the same as in Example 1.

Comparative Example 1 Using the same glass wool as in Example 1, pulverization was performed using a knife-type hammer impact pulverizer. Comparative Example 2 The same glass wool as in Example 1 was pulverized using a ball mill type pulverizer. Comparative Example 3 The same bulk glass wool as in Example 2 was pulverized using a knife-type hammer impact pulverizer. The results obtained in Examples 1 and 2 and Comparative Examples 1 to 3 are shown in Table 1 below.

[0028]

[Table 1]

In the first embodiment, the pretreatment (the pretreatment referred to herein means that the surface material of the glass wool molded body is peeled in advance and cut into small pieces (about 3 × 3 × 6 mm) so as to enter the pulverizer. ), The surface material was not pulverized after the pulverization, so that it was easily separated, and only a powdery fiber material having an average aspect ratio of about 60 was obtained as shown in FIG. Moreover, 16 kg / min. The pulverization could be performed continuously at a production amount of. Further, in Example 2, although the production amount was low, a good pulverized product was obtained as in Example 1.

On the other hand, in Comparative Examples 1 and 2, there is a need for a pretreatment, and when this time is included, about 30 min. Cost. Also, in the obtained pulverized product, in Comparative Example 1, the filaments were intertwined and formed into a lump,
The desired pulverized product could not be obtained, and in Comparative Example 2, only a granular pulverized product having no aspect ratio was obtained.
Further, in Comparative Example 3, the fluidity of the fiber material was very poor, and the fiber material was clogged in the hopper installed at the inlet of the crusher and did not reach the rotor.

When the pulverized product obtained in Example 1 and a thermoplastic resin were kneaded together and molded, improvements in elastic modulus, strength and dimensional stability were also confirmed. And had excellent properties. Example 1
Melamine powder resin binder 20
Then, the mixture was heated and pressed at 180 ° C. for 10 minutes at a pressure of 3 kgf / cm ² using a hot press to form a board. This molded product is a porous inorganic fiber board having a density of 1.1 and a thickness of 10 mm, and a bending strength of 310 kgf.
/ Cm ² and high strength. Further, in order to regenerate the pulverized material of Example 1 as a cullet, an attempt was made to burn off the binder in the pulverized material using a flame. As a result, a glass bead-like cullet having good handleability was able to be produced. The ground product obtained in Example 2 was the same as above.

[0032]

As described above, according to the present invention, an inorganic fiber material such as glass wool can be crushed continuously and with high productivity in a short time. Further, in the obtained crushed material, as shown in FIG. 5, the crushed filaments were straight, and there was no entanglement between the filaments. Further, the pulverized material has good dispersibility in a resin and has an appropriate aspect ratio. Therefore, by using the pulverized material according to the present invention, a high-strength fiber molded product or FRP can be obtained. Further, when the cullet is regenerated as a cullet, the removal of the binder by the flame is good, and the cullet can be regenerated as a bead cullet.

[Brief description of the drawings]

FIG. 1 illustrates a method and apparatus of the present invention.

FIG. 2 is a diagram illustrating a method and an apparatus of the present invention.

FIG. 3 illustrates a method and an apparatus of the present invention.

FIG. 4 illustrates a method and an apparatus of the present invention.

FIG. 5 is a diagram showing a state of particles of a pulverized product obtained by the method of the present invention.

[Explanation of symbols]

 1: supply belt 2: presser belt 3, 3 ': main roll 4: first sub-roll 4': second sub-roll 5: drive motor 6: feeder 7: empty feed pipe 8: vibration filter W: glass wool

Claims (10)

[Claims] An inorganic fiber material is continuously supplied between a pair of rolls rotating in opposite directions, and the inorganic fiber material is crushed by a pressing force of the pair of rolls. How to crush fiber materials. 2. The method for pulverizing an inorganic fiber material according to claim 1, wherein the pulverization between the rolls is performed a plurality of times. 3. The method according to claim 1, wherein a plurality of pairs of rolls are used, and the first pair of rolls is positioned above the next pair of rolls. 4. The method for pulverizing an inorganic fiber material according to claim 1, wherein the inorganic fiber material is glass wool or rock wool. 5. The method according to claim 2, wherein the clearance between the plurality of pairs of rolls and the basis weight of the inorganic fiber material supplied to the clearance are adjusted such that the aspect ratio of the obtained crushed particles is 6 to 125. 5. The method for pulverizing an inorganic fiber material according to any one of items 4 to 4. 6. The clearance between the first pair of rolls is 2
And to 5 mm, according to claim 2, the basis weight of the inorganic fiber material fed into the clearance to 0.5 to 5.0 g / cm ²
The method for pulverizing an inorganic fiber material according to any one of claims 5 to 5. 7. The clearance between the first pair of rolls is 2
The method for pulverizing an inorganic fiber material according to any one of claims 2 to 5, wherein the second pair of rolls has a clearance of 0.1 to 1.0 mm. 8. A pair of rolls rotating in opposite directions to each other, and means for transporting the inorganic fiber material between the rolls;
An apparatus for pulverizing an inorganic fiber material, comprising: driving means for rotating the pair of rolls; and means for accumulating the inorganic fiber material pulverized by the pair of rolls. 9. A pair of rolls comprising a main roll and a first sub-roll, a second sub-roll is further provided downstream of the rotation of the main roll, and an inorganic fiber material is provided between the main roll and the first sub-roll. The inorganic fiber material pulverizing device according to claim 8, wherein the inorganic fiber material is finely pulverized between the main roll and the second sub-roll. 10. The apparatus for pulverizing an inorganic fiber material according to claim 9, wherein means for consolidating the fiber material conveyed between the pair of rolls is provided to face the conveying means.