JPH09957A - Method for pulverizing asphalt-based sheets - Google Patents

Abstract

PURPOSE: To pulverize asphalt-based sheets into recyclable size by coarsely crushing the asphalt-based sheets in the shape having specified thickness and major axis in advance and feeding them to a pulverizer of prescribed construction. CONSTITUTION: Asphalt-based sheets are coarsely crushed in the shape of <=1cm thickness and <=10cm major axis. The crushed material is fed into an inlet part 2 of a pulverizer to pulverize it. This pulverizer is constituted by arranging a lot of discs 7 at regular intervals in the central part of a cylindrical casing 1 by a longitudinal rotating shaft 3. Between the discs 7 and adjacent to the outer peripheries thereof, a lot of vertical plates are fixed leaving narrow gaps between them and the cylindrical casing wall surface. Pulverizing part 5 surrounded by the upper and lower discs 7 may be formed in 3 to 7 stages, but preferably in 4 to 5 stages.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for crushing asphalt-based sheets and an additive for asphalt or resin obtained by the method.

[0002]

2. Description of the Related Art As is well known, regulations on industrial waste are being strengthened, and the responsibility of the generator is strongly demanded.
Even waterproof material manufacturers are struggling to recycle the waste products generated during production. These can be crushed once roughly and then finely crushed to make rational crushing, and the range of usages later can be expanded.

Since the vulcanized rubber sheet and the vinyl chloride sheet can be easily crushed by a general-purpose crusher, they are once crushed and then blended again with the vulcanized rubber or vinyl chloride or reused as a filler.

However, since asphalt-based waterproof materials and the like generally have strong self-adhesive properties, it is extremely difficult and uneconomical to grind them by conventional grinding techniques. That is, the material can be once roughly cut with a guillotine cutter or the like, but in order to make it finer, it is unavoidable to rely on a mechanical crusher with a fixed blade and a rotary blade. However, these pulverizers generate heat due to shearing and the temperature rises, the pulverized material sticks to the blade, and the pulverizing effect is significantly reduced. Moreover, this method cannot reduce the crushed particle size,
The reuse range after that is restricted. Freezing and crushing can be considered, but practical application is impossible in terms of cost. Therefore, these materials cannot be reused, and they have no choice but to rely on landfill or incineration.

Furthermore, the treatment of the removed waterproof layer that occurs during the repair and waterproof work also presents a very big problem. In the case of renovation waterproofing work, it would be good if a method of leaving the existing waterproof layer and covering it with a new waterproof layer can be adopted, but in reality it is unavoidable due to severe damage to the existing waterproof layer or structural problems of the building. In many cases the layers have to be removed. Almost 100% of the removed waterproof layers are disposed of regardless of their types. It is estimated that about 15,000 tons of waterproof layer will be generated annually in the case of asphalt waterproofing, and at least a treatment cost of 300 million yen or more will occur. It is estimated that about 55,000 tons of waste material is included when including waterproofing layers other than asphalt waterproofing. If these can be reused, it can be said to be extremely meaningful in terms of environmental protection and resource conservation.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel method for crushing asphalt-based sheets into a reusable size such as 30 to 100 mesh.

[0007]

According to the present invention, there is provided a cylindrical casing, a gas provided in a lower portion thereof and an inlet portion for supplying an object to be crushed to the cylindrical casing, and a gas provided in an upper portion thereof and crushed. The discharging unit for discharging a substance, a rotating shaft vertically provided in the center of the cylindrical casing, and a crushing unit attached to the rotating shaft, the crushing unit having a constant interval perpendicular to the rotating shaft. A large number of discs provided in advance, and a plurality of vertical plates that are provided only between the discs and in the vicinity of the outer periphery of the disc, and the outer side of which is fixed with a narrow gap to the wall surface of the cylindrical casing. A method of crushing asphalt-based sheets using a crusher consisting of
The present invention relates to a method for crushing asphalt-based sheets, which comprises crushing into a shape having a diameter of not more than 10 cm and a major axis of not more than 10 cm, and supplying it to the inlet.

As the asphalt-based sheets, there are asphalt-based waterproof materials, roofing materials, subbing materials, layer constituent materials of these materials and waste materials generated during their manufacture, and further, these parts are repaired and disassembled. This refers to the waste material of asphalt-based sheets that occurs during the operation.

Since these asphalt-based sheets cannot be directly supplied to the crusher, the asphalt-based sheets have a thickness of 1 cm or less and a major axis of 10 cm or less.
It is preferably roughly crushed to 5 cm or less. The thickness is 1 cm or less,
If the major axis is 10 cm or less, the lower limit is not particularly problematic, but since it is coarse crushing, the lower limit is generally about 0.5 mm in thickness and about 2 mm in major axis.

The asphalt-based sheets have a very strong self-adhesive property due to the asphalt contained therein and the self-adhesive layer which is sometimes used.
It is preferable that the following measures be appropriately combined or taken independently. 1. Supply anti-blocking material at the same time as the material to be crushed 2. By using the cylindrical casing and the gap adjustments 1 and 2 of the crushing part together, even a material having a strong self-adhesive property can be easily crushed without blocking inside the crusher.

Examples of the anti-blocking material include powdery inorganic and / or organic fillers for rubber and / or resin. Specifically, calcium carbonate, magnesium carbonate, clay, talc, silica,
Although powders of carbon black or metal salts of stearic acid can be mentioned, calcium carbonate and talc are particularly preferable.

The amount of the anti-blocking material used varies depending on the properties of the material to be ground, but generally, the use of 50 to 1000 parts by weight per 100 parts by weight of the material to be ground can achieve the purpose.

The preferable amount of the anti-blocking material to be used according to the roots of the material to be crushed is as follows in terms of the amount used relative to 100 parts by weight of the material to be crushed. Roots of crushed material Anti-blocking material usage Normal asphalt waterproofing material 50-100 parts by weight Modified asphalt waterproofing material 300-500 parts by weight Self-adhesive type waterproofing material 500-700 parts by weight

These anti-blocking materials can be separated and recycled by using either a cyclone or a bag filter installed in the latter stage of the crusher. However, in that case, since the asphalt is adsorbed on the anti-blocking material that has been used once, the anti-blocking effect will gradually decrease as the recycling is repeated. Therefore 3 ~
It's better to only recycle 4 times.

Before describing the gap between the cylindrical casing and the crushing section, first, a specific example of the crusher used in the present invention will be described. The crusher is shown in FIGS. 1 and 2. Cylindrical casing 1, an inlet portion 2 provided at the lower portion thereof for supplying gas and crushed material to the cylindrical casing, an outlet portion provided at the upper portion thereof for discharging gas and crushed material, The cylindrical casing is composed of a rotating shaft 3 vertically provided in the center and a crushing portion 5 attached to the rotating shaft 3, and the crushing portion 5 is provided at a right angle to the rotating shaft 3 at a constant interval. Many discs 7, 7, ...
, And a plurality of vertical plates 6, 6 which are provided only between the respective discs and in the vicinity of the outer peripheral portion thereof, and whose outer sides are fixed to the wall surface of the cylindrical casing with a narrow gap.
The crushing section 5 encased by the upper and lower discs can be used in 3 to 7 stages, but is preferably 4 to 5 stages.

It is preferable that the vertical plate 6 is attached so that its position is gradually lowered as it goes down to the first and second stages. It is preferable that two vertical plates 6 and 6'are used in a stacked manner, and one plate is shifted and fixed, so that the space between the vertical plate 6'and the wall surface of the cylindrical casing is adjusted by an arbitrary adjusting means. .

The gap adjustment will be described in detail. In the case of a waterproof material having almost no self-adhesive property, the smaller the gap is, the higher the crushing effect is. It is preferable to set it to 3 mm, 3 mm, and 2 mm. However, in the case of a material having a strong self-adhesive property, it is less likely that blocking will occur when the gap at the lowermost stage is widened, and the crushing effect does not decrease so much. From experience, it is 7mm, 5mm, 5mm, 3m from the bottom.
It is preferable to set m. Still, since continuous operation may cause blocking, it is preferable to use an anti-blocking material together.

As shown in FIG. 3, by using this crusher, the asphalt pieces are separated from each other by the space between the vertical plate and the cylindrical wall surface, the high-speed shock turbulence generated in the void, the collision between the vertical plate and the circular plate, etc. In an extremely complicated movement, it is crushed by the collision, and it is cooled by a gas that also serves as a carrier flow or a stirring flow in a so-called air-cooled manner, so it is possible to suppress shear heat generation during crushing and continue at around room temperature. It is possible to pulverize, and therefore it is possible to suppress blocking due to softening accompanying the temperature rise of asphalt.

The flow rate of the gas flow supplied to the inlet is preferably controlled by a fan provided separately.
As a result, the most suitable flow rate can be maintained and the temperature rise in the crusher can be suppressed.

In the discharge part 4 of the crusher, classifiers such as cyclones can be installed in series with a plurality of stages having different performances. Then, after the classifiers, fine particles can be further collected using a bag filter or the like, and then the gas can be released to the atmosphere or recycled.

As the material to be crushed, a non-woven fabric / woven cloth, paper or the like made of synthetic fibers or glass is used as a reinforcing material, and these reinforcing materials can be crushed. However, the synthetic fiber non-woven material has a long fiber length and is complicated. Since they are entangled with each other, they cannot be completely crushed and become fibrous with a length of several mm to several tens of mm, which are mixed in the crushed product. If those fibers interfere with the subsequent reuse, a classifier may be installed after the crusher to separate only the fibers.

The pulverized product obtained by the method of the present invention is useful as an additive for asphalts such as straight asphalt, blown asphalt, modified asphalt and the like, or resin, and 5-10% for asphalts and resins.
About 0% by weight can be blended and used.

[0023]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited thereto.

Example 1 (Crushing an asphalt-based product out of specifications at the time of production) A roll-shaped product having a diameter of about 25 cm and a length of 1 m was previously crushed by a crusher with a rotary blade to a width of 0.5 cm and a length of 8
The material was roughly crushed to cm to obtain a crushed object of the present invention. On the other hand, calcium carbonate was used as an anti-blocking material under the following conditions, and the material to be ground and calcium carbonate were simultaneously charged from the raw material charging port.

[0025]

[Table 1] Air flow rate 55m ³ / min Rotation speed 2000rpm

2 in the above table. In the case of the self-adhesive product, polyester spunbond was used as the base material, and since they were formed into fibers and mixed in the pulverized product, they were removed by a classifier. As the pulverized products, those having a size of 6 to 140 mesh were obtained.

Example 2 (Crushing of the removed waterproof layer generated during waterproof repair work) The waterproof layer consisting of four asphalt roofing layers was removed. At the time of removal, the waterproof layer cut into a size of 12 mm and a size of 1 m × 1 m was 0.8 c in thickness with the same coarse crusher as in Example 1.
m was coarsely crushed to a size of 2 × 8 cm to obtain a crushed object.
This is the same as in 1. Grinding was carried out under the same grinding conditions as in the case of asphalt roofing. The same pulverized product was obtained.

Application Example The above pulverized product was reused by the following method. Normally, 30 to 50 wt% filler is added to the coating asphalt during the production of asphalt roofing. Therefore, as a substitute for the above filler, 1. The asphalt roofing grind was applied and 50 parts by weight of the grind was added to 100 parts by weight of blown asphalt.

[0029]

[Table 2] The quality was comparable to the case of adding calcium carbonate.

[0030]

[Effect] Asphalt-based sheets, which have so far only been incinerated or landfilled, can be reused as raw materials for the first time in the world by the present invention. As described above, the present invention has extremely favorable results in terms of environmental protection and resource saving.

[Brief description of drawings]

FIG. 1 is a perspective view conceptually showing a crusher adopted in a method for crushing asphalt-based sheets according to the present invention.

FIG. 2 is a plan view conceptually showing a crusher adopted in the method for crushing asphalt-based sheets according to the present invention.

FIG. 3 is a plan view conceptually showing a crushing state of a crusher adopted in the crushing method for asphalt-based sheets according to the present invention.

[Explanation of symbols]

 1 Cylindrical casing 2 Inlet part 3 Rotating shaft 4 Discharging part 5 Crushing part 6 Vertical plate 6'Vertical plate 7 Disc

Front page continuation (72) Toru Kojima, Toru Kojima 1-3-1 Kodai, Adachi-ku, Tokyo Tajima Roofing Co., Ltd. (72) Inventor Takayuki Maruyama 4-6-5 Higashiueno, Taito-ku, Tokyo Yama Co., Ltd. Inside the commerce

Claims (5)

[Claims] 1. A cylindrical casing, an inlet portion provided at a lower portion thereof for supplying gas and an object to be crushed to the cylindrical casing, and an outlet portion provided at an upper portion for discharging the gas and pulverized material. A rotating shaft vertically provided in the center of the cylindrical casing, and a crushing unit attached to the rotating shaft, wherein the crushing unit is provided with a large number of circles provided at regular intervals at right angles to the rotating shaft. Asphalt using a crusher consisting of a plate and a large number of vertical plates which are provided between the discs and only in the vicinity of the outer periphery of the disc, and the outside of which is fixed with a narrow gap between it and the wall surface of the cylindrical casing. A method for crushing system-based sheets, which comprises preliminarily crushing the asphalt-based sheets into a shape having a thickness of 1 cm or less and a major axis of 10 cm or less and supplying the asphalt to the inlet portion. A method of crushing sheet materials. 2. The method according to claim 1, which is carried out by adding an anti-blocking material. 3. The method according to claim 1, wherein the anti-blocking material is a powdered inorganic and / or organic filler for rubber and / or resin. 4. The method according to claim 1, wherein the asphalt-based sheet is a waste material of the asphalt-based sheet. 5. An asphalt or resin additive obtained by the method according to claim 1, 2, 3 or 4.