JPH05168969A - Crushing of cloth sheet - Google Patents

Abstract

PURPOSE:To make it possible to manufacture desired crushed pulp particles with high productivity by crushing cloth sheet using a rotary cutter in a primary crushing process, then classifying the particles by air blowing, and crushing them in a secondary fine-crushing process. CONSTITUTION:An appropriate raw material cloth sheet such as sheet pulp 1 is supplied to a rotary cutter 2 of a primary crusher, and is roughly crushed by rotation of a cutting blade. Next, the roughly crushed product pulp is roughly classified using a cyclone 3 and the classified product is supplied to a secondary crusher through a stock blender 5. In addition, those which can be efficiently recycled and utilized through a bag filter 4 among the classes of pulp rejected as not meeting specifications are supplied to the stock blender 5 likewise, and then are fed to the secondary crusher 6. In this secondary crushing process 6, it is designed so that fine crushing takes place with the help of a rotation process, and at the same time, the pulp is also classified using an air blowing process. Finally the crushed product pulp of a specified size is sent to a silo 7, and the fine-crushed pulp stored in the silo 7 is sent to a granulation process A.

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 a cloth sheet material. More specifically, the present invention is
The present invention relates to an improved method for pulverizing a cloth sheet material, which enables highly productive production of a composition such as an amino resin, a urea resin and a melamine resin, and a finely pulverized pulp product useful for a molded product thereof.

[0002]

2. Description of the Related Art Pulp has been used as a composition of amino resins, urea resins and the like, and is useful as a compound in moldings thereof. In recent years, the demand for finely pulverized products has increased. There is also. Up to now, such finely pulverized pulp has been produced by various methods, and a method of using sheet pulp as a raw material in a canter pulverizer or the like is also known.

[0003]

However, in any of the conventional methods, 90% by weight or more of the 145 mesh pass product, which is the most preferable range for the pulp shape,
It was difficult to efficiently produce 0% of 100-mesh-on product and finely pulverized pulp having an average fiber length of 100 μm or less.

In any of the methods, it was not possible to produce such a pulp having a predetermined shape quality with only one crushing step. Of course, since the pulp of the above quality to be a product is also contained in the pulp that is classified and recycled even in the conventional process, it is possible to classify them, but the productivity is extremely low,
Since it is difficult to classify those having a small apparent specific gravity, it was practically impossible to produce pulp of the above quality by the conventional method.

In view of the above, the present invention solves the drawbacks of the conventional method in order to produce a crushed cloth sheet product of pulp or the like having the required shape quality as described above, and a new cloth sheet material capable of high-efficiency production. It is intended to provide a crushing method of.

[0006]

In order to solve the above-mentioned problems, the present invention comprises a secondary crushing process in which a cloth sheet material such as sheet pulp is first crushed by a rotary cutter, and then finely crushed at the same time as the air stage. A method for pulverizing a cloth sheet material, which is characterized by being carried out.

[0007]

In the present invention, a rotary cutter and
Since the secondary pulverization is performed at the same time as the air classification and fine pulverization, it is possible to produce a finely pulverized product with high productivity at a ratio of 90 to 95 with respect to the raw material 100. For example, it is possible to manufacture required finely pulverized pulp having 90% by weight of 145 mesh pass product, 0% of 100 mesh on product, and average fiber length of 100 μm or less.

Of course, the present invention is not limited to this quality, and the present invention is also effective for the production of finely pulverized products such as various sheet films, cloths and papers.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a process flow chart showing the method of the present invention. For example, as illustrated in FIG. 1, in the method of the present invention, first, a suitable raw material cloth sheet material such as sheet pulp (1) is supplied to a rotary cutter (2) which is a primary crusher. The rotary cutter (2) roughly pulverizes the sheet pulp (1) and the like by rotating a cutting blade.

In this coarse crushing, it is desirable that the crushed product does not become cotton-like. And, preferably, in the case of sheet pulp, 50% by weight or more of a 145 mesh pass product and 0.5% or less of a 30 mesh on product are crushed products. The maximum fiber length at this time is 700 μm
Hereafter, it is desirable that the average is 200 μm or less. Next, the crushed product is roughly classified by a cyclone (3) and supplied to a secondary crusher (6) through a stock blender (5). Further, among the pulps that have been classified by the cyclone (3), those that can be effectively recovered and used by the bag filter (4) are similarly used in the stock blender (5).
To the secondary crusher (6).

In this secondary crusher (6), fine crushing by a rotating method is performed, and at the same time air classification is performed. The required size of ground pulp is sent to the silo (7). The finely pulverized pulp stored and stored here is sent to the grazing step (A) and the like. <Production Example> In the above steps, the pulp sheet was actually crushed. A CS cutter manufactured by Condax Co. was used as the rotary cutter (2) as the primary crusher, and an ACM manufactured by Hosokawa Micron was used as the secondary crusher (6).

As a result of this pulverization, pulverized pulp having 145 mesh under 98% by weight, 100 mesh on 0% by weight and an average fiber length of 93 μm was obtained. This is raw material 10
This was equivalent to the ratio of product 95 to 0. On the other hand, in the conventional grinding method, this product ratio was only 15 at the same unit time.

[0013]

As described above in detail, according to the present invention, it becomes possible to produce the required finely pulverized pulp with high productivity.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating the steps of the present invention.

[Explanation of symbols] 1 sheet pulp 2 rotary cutter 3 cyclone 4 bag filter 5 stock blender 6 secondary crusher 7 silo

Claims (3)

[Claims] 1. A method of pulverizing a cloth sheet material, which comprises first pulverizing the cloth sheet material with a rotary cutter, and then performing secondary pulverization in which the cloth sheet material is finely pulverized at the same time as the stepping of the wind force. 2. The method according to claim 1, wherein in the pulverization of sheet pulp, primary pulverization produces a pulverized product having 145 mesh pass crystals of 50% or more and 30 mesh on product of 0.5% or less. 3. 145 mesh pass product 90% or more, 10
The method according to claim 2, wherein a crushed pulp having an average fiber length of 100 μm or less is produced with 0% of 0 mesh on product.