JPS59156422A - Granulating method - Google Patents

Abstract

PURPOSE:To obtain a product having a good particle size, by detecting the rising in a temp. by providing a controller to a part of a tank while supplying a cooling medium on the basis of the order from the controller to rapidly cool the tank to a stable temp. CONSTITUTION:A controller 6 due to TIC for performing the opening and closing indication of a valve 4 is mounted to the intermediate position of a heating and mixing tank 1 while a nozzle 3 for supplying a cooling medium B due to CO2 into the tank 1 when the substance A to be treated is raised to a temp. exceeding a set value is provided to the mixing tank 1 so as to be inserted through one ceiling position of said tank 1. A cooling medium intake port 5 is provided to the leading end part of the nozzle 3 and an arranged pipe to which a valve 4 opened and closed in a cooperated state by the order of the controller 6 is applied to the halfway part between the nozzle 3 and the intake port 5 while the discharge port 1a of the substance A to be treated is provided to one lateral bottom part of the mixing tank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a granulation method for materials that aggregate and granulate when a predetermined temperature is reached, such as polymers made of high molecular compounds or pigments.

Normally, it is extremely difficult to control the temperature in heating granulation of this seed material, so it is processed under constant power conditions using semiconductor Zyristor control. However, in the conventional mixed type jacket cooling, it took a long time to cool down to the desired temperature that is optimal for granulation. Therefore, there is a problem in that the treated material made of the above-mentioned material adheres and grows during this unstable time, resulting in uneven particle size.

This invention was made to solve the above problems, and its purpose is to detect a temperature rise exceeding a set value in the material to be treated in a heating mixing tank, and at the same time
By supplying 02 (dry ice) to rapidly cool the processed material and slowly cooling it in the mixing cooling tank in the next step, the time under unstable temperature is shortened and adhesion growth on the processed material is prevented. The object of the present invention is to provide a granulation method that can consistently produce products with good particle size.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, the granulation device which is the subject of the invention is constructed as follows. That is, as shown in the drawings, this granulation device consists of the first 1. A salmon heating type mixing tank 1 in which a mixing blade 9, which is rotated by the drive of a motor 8, is housed in the inner bottom is arranged at the bottom position.

In the middle of this heating mixing tank l, there is an i' IC (detection device) which operates when the temperature of the material to be processed in the tank rises above a set value and instructs the opening and closing of a valve 4, which will be described later.
1 controller 6 is installed. When the crystallinity of the processed material in the tank increases beyond the set value, a refrigerant B using C02 (dry ice) is supplied to the most part of the - side of the heating mixing tank L. A nozzle 3 is inserted into the nozzle 3, and the nozzle 3 is provided with a refrigerant intake 1"+5 at the tip 1'+Ii, and a refrigerant intake 1"+5 at the middle part 9"--the controller 6.
The valve 4, which opens and closes in conjunction with the commands of A bank filter 2 is housed in the diameter base to capture the powder of the processed material A, which is accompanied by the gas C, before agglomeration, since the 002 (dry ice) is sublimated and gasified in the tank. Furthermore, a discharge port 1a is provided at the bottom of one side of the heating mixing tank 1 to send the processed material in the tank to the next process, and a discharge valve 7 is installed at this position so that it can be opened and closed. In the next process position of the heating mixing tank 1 described above, a jacket cooling type mixing cooling tank 10, in which a mixing blade 11 rotated by the drive of a motor 12 is housed in the inner bottom, is arranged in communication.

A method for granulating materials such as polymers and pigments using the above-mentioned apparatus will be explained.

First, the processed material A made by mixing the powder of the above-mentioned material and the powder that will become the binder is placed in the heating mixing tank 1, and while jacket heating is performed to a temperature slightly lower than the processing temperature, the mixing blade is driven by the motor 8. 9 is rotated at high speed, the treated material A generates heat due to mutual frictional heat inside the powder, and the temperature gradually rises. When the binder begins to melt, it aggregates and granulation begins. In this case, when the temperature rise reaches a preset temperature value, the controller 6 detects the temperature in the material A and issues a command to open the valve 4. Therefore, the valve 4 is opened! C supplied from refrigerant intake port 5
A refrigerant 13 made of 02 (dry ice) is supplied into the mixing tank 1 through a nozzle 3. Therefore, the temperature of the processed material A entering the tank can be rapidly cooled to a predetermined stable temperature. At that time, the above CO3 (dry ice) can be easily treated by keeping it at around -80°C, and since it is inert, it does not react with the processed material A and can be dried. . This makes it possible to easily and reliably prevent adhesion growth on the processed material A. Further, since the C02 (dry ice) supplied into the heating mixing tank 1 is sublimated and gasified by the temperature inside the tank, this gas C is discharged to the outside of the tank from the other piping port. 0) CO2 (dry ice) can be recycled by being reprocessed and transported to the refrigerant intake port 5. In addition, since the pack filter 2 is attached to the piping port, it is possible to capture the processed material when it is in a powder state and prevent it from escaping to the outside.

Processed material A, which has been granulated to an appropriate particle size according to item 1, is sent out from the bottom outlet 1a into the next process mixing cooling tank IO by opening the discharge valve 7, and is jacket-cooled in this tank. While being gradually cooled down to a temperature of about 100 ml, the granulated material is stirred by the somewhat slow rotational force of the mixing blade 11 driven by the motor 12 at this position, and the granulation is completed to form a product with a predetermined particle size.

In the above embodiment, the refrigerant B using C02 (dry ice) was supplied into the heating mixing tank 1, but the granulation method of the present invention is not limited to the above embodiment. The same granulation as described above can be obtained even if the supply location is shifted to the outlet 1a or the mixing cooling tank 10.

As explained in Section 2 below, the present invention provides that when the temperature rise during stirring and mixing of the processed material in the heating mixing tank 1 exceeds the set value, the controller installed in a part of the heating mixing tank 1 The rise in temperature is detected by the roller 6, and in accordance with the command from the controller 6, a refrigerant B made of C02 (1, lye ice) is supplied from the nozzle 3 into the heating mixing tank 1 to rapidly cool the processed material A to a stable temperature. ,Next] In the two-culm mixing cooling tank 10, the granulated material is gradually cooled, thereby increasing the IF'i' temperature of the material flowing into the heating mixing tank 1.
Does it depend on the supply of yen? 11th i31! It can be rapidly cooled to a stable temperature that is optimal for granulation, reducing the unstable temperature time and ensuring granulation with good particle size, which makes it easy to obtain consistently high-quality products. from,
There are some fruits that can greatly contribute to the development of this kind of industry.

[Brief explanation of the drawing]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a series of granulation devices that are the main part of a granulation method according to the present invention. l... Heating mixing tank 3... Nozzle 4...
Valve 5... Refrigerant intake port 6... Controller 7... Discharge valve 8.12... Motor 9.11... Mixing vane 10... Mixing cooling tank 8... Processed material B...・Refrigerant agent'
XL Tsune Kaki

Claims (2)

[Claims] (1) Detects when the temperature of the material to be processed in the heating mixing tank has risen to a set value, and based on this detection signal, supplies refrigerant to the heating mixing tank to bring the temperature of the material to a stable level. A granulation method characterized by rapidly cooling and slowly cooling the treated material discharged from the heating mixing tank in a mixing cooling tank. (2) The granulation method according to claim 1, characterized in that C02 (dry ice) is used as the refrigerant.