JPS59196729A - Heat treatment apparatus of powder - Google Patents

Abstract

PURPOSE:To enable high productivity at high yield, by providing a cooling jacket to the outer peripheral part of an jet nozzle of an air stream for dispersing thermoplastic particles while providing an air gap between the jet nozzle and the cooling jacket. CONSTITUTION:A hopper 18 is connected to the upper part of an ejector mixing chamber 15 and a pressurized air stream introducing pipe 17 is connected to said hopper 18 from a horizontal direction so as to pierce the side wall thereof. An ejector throat part 16 is connected to the side wall opposite to the wall part where the introducing pipe 17 is connected and further connected to a dispersing air stream supply pipe 2 which is, inturn, connected to the side wall of a revolving chamber 3 from the horizontal tangential direction of said revolving chamber. A dispersing air stream jet nozzle 4 is connected to the center of the bottom surface of the revolving chamber 3 in a downwardly directed state and a cooling jacket 5 is mounted to the outer peripheral part of the jet nozzle 4 while an air gap 19 is formed between the nozzle 4 and the jacket 5.

Description

[Detailed description of the invention] The present invention relates to a powder heat treatment apparatus.

More specifically, the present invention relates to a heat treatment device for melting and spheroidizing thermoplastic particles in an air stream.

Conventionally, thermoplastic particles are spheroidized by dissolving and dispersing them in water or an organic solvent, atomizing them using a single-fluid nozzle or rotating disk method, and drying them in hot air to reduce the spherical diameter. A wet method such as the so-called spray dryer method for obtaining particles, or a dry method in which thermoplastic particles are dispersed in a hot air stream to achieve spheroidization, etc., are employed.

However, in the conventional wet method, the solvent must be removed before obtaining spherical particles, which necessitates the addition of additional equipment such as a large drying chamber, solvent recovery equipment, and safety measures to prevent explosions. I failed.

In addition, when processing fine powder with a flaking diameter of 100 μm or less using the dry method, it is necessary to prevent thermoplastic particles from forming due to molten layer mineralization, generation of coarse particles, and ejection/slopping of thermoplastic particles onto the wall surface of the container. This often leads to poor yield and productivity, as well as uneven heat treatment conditions.

Conventionally, in order to prevent the thermoplastic particles from being thermally fused to the wall surface of the jet nozzle temple of the thermoplastic particle dispersion air stream, a flow path was provided around the outer circumference of the jet nozzle, and a cooling medium such as water or cold air was flowed through the flow path. , a method for cooling the jet nozzle part is described in Japanese Patent Application Laid-open No. 53-60379! ill! However, in this method, the inner wall of the ejection nozzle drops below the dew point and water droplets are generated on the inner wall surface of the nozzle, causing thermal dJd particle adhesion2, which hinders the stable processing of a large amount of powder. Ta.

Furthermore, Japanese Patent Publication No. 55-2165 describes the introduction of cooling air between the dispersion airflow and the hot airflow for the purpose of preventing particles from adhering to the dispersion airflow jet nozzle opening. In this method, the temperature around the thermal convergence area where the dispersed air flow and the hot air flow mix decreases due to the introduction of cooling air, resulting in a significant decrease in thermal efficiency. It is unavoidable that the 4i! t. It is rarely possible to completely prevent thermoplastic particles from adhering or thermally adhering to the wall surface.

The present invention has been made to eliminate all of the above-mentioned drawbacks. That is, the object of WF-1 of the present invention is to provide a heat treatment apparatus for thermoplastic plates with high corrosion resistance, in which thermoplastic particles do not adhere to or are thermally fused to the inner wall surface of a dispersion air jet jet nozzle. This is the second object of the present invention. 'iThe thermoplastic particles adhere to the inner surface of the dispersed air jet nozzle and around the tip, causing heat 18!
l! It is an object of the present invention to provide a heat treatment apparatus for thermoplastic plates, which has a high yield and high productivity without causing damage, and is capable of continuous operation for a long time.

Among the above objects of the invention, the first object is to provide a heat treatment apparatus for melting and spheroidizing thermal 5J plastic particles in an air flow,
Thermoplastic particles 1r) j Put a cooling jacket around the outer circumference of the air jet nozzle -! This is achieved by a heat treatment apparatus for thermoplastic particles characterized in that a gap is provided between the jet nozzle and the cooling jacket.

The second object of the present invention is to provide a heat treatment apparatus for melting and spheroidizing thermoplastic particles in an air stream, by providing a cooling jacket around the outer periphery of the jet nozzle for dispersing the thermoplastic particles. This is achieved by a thermoplastic particle heat treatment apparatus characterized in that a gap is provided between the ejection nozzle and the cooling jacket, and a slit is provided at the outer periphery of the ejection nozzle tip to form an air curtain.

The apparatus according to the invention will now be described in detail with reference to the drawings, but the aspects of the invention are not limited thereby.

Figure 1 shows an example of a 7υth device that blows out a dispersion air stream containing thermoplastic particles of wood.

In FIG. 1, reference numeral 15 denotes an esector mixed chamber in which a bomber 18 is connected to the upper part, and a pressurized airflow dedicated pipe 17 is connected from the water direction through the side wall. The ejector throw section 16 is connected to the side wall of the ejector. 16 is further connected to the fractional airflow supply pipe 2, and 7.2 is M
It follows from the horizontal tangential direction of 3 on the j times ¥3 side @, and a dispersion air flow jetting nozzle 4 is connected downward to the center of the bottom surface of the swirling chamber 3.

A cooling jacket 5 having a hollow interior is placed around the outer periphery of the nozzle 4 at a position where a gap 19 is formed between the peak 1 of the nozzle 4 and the jacket 5, and a slit 9 is formed at the outer periphery of the tip of the nozzle 4. It is placed surrounding. A cooling air inlet pipe 6 and a cooling-like discharge pipe 7 are connected to the earth wall part of the jacket 5 for Zara Niji 1j, passing through the earth wall part. 8 are connected.

In the apparatus shown in FIG. 1, when the whole pressurized air 13 is ejected into the ejector mixing chamber 15 through the compressed air introduction pipe 17, the thermoplastic plate 14 is sucked together with the air from the hopper. The agglomerated particles are crushed and uniformly dispersed by a strong shearing action within the throat portion 16. Furthermore, the dispersion airflow 1 of thermoplastic particles is swirled in the swirling chamber 3, collected in the lower jet nozzle part 4, swirled near the inner wall surface of the nozzle by a blower, descended, and then flowed around the tip of the nozzle 4. , it is ejected as a Hollow Cone Flow 12 while maintaining a constant eruption angle, constant linear velocity, and uniform particle concentration. Hot air is injected from the outer periphery of this dispersed air flow into the Hollow Cone Flow 12. By introducing and mixing the streams 11 and thermally associating them, individual thermoplastic particles can be dispersed well and spread in a conical shape at a constant concentration.At this time, compressed air can be introduced from 8 K. As a result, air is ejected from the slit 9 to form an air curtain.Furthermore, by circulating a cooling medium such as cold water or cold air through a cooling jacket provided on the outer periphery of the slit 9, air is ejected from the ejection nozzle portion 4 and the inside of the nozzle portion 4. can be kept close to room temperature at all times without being affected by the temperature of the hot air flow 11 on the outer periphery of the cooling jacket 5, and at the same time prevents heat fusion on the inner wall of the jet nozzle, and at the same time
9 can also prevent the thermoplastic particles from adhering to the jet nozzle portion 4 and the cooling jar.

In addition, by blowing out an air curtain from the slit section, it is possible to prevent the adhesion of thermoplastic particles to the tip of the jet nozzle section 11, thereby preventing the formation of icicle-like deposits of particle adhesion at the tip of the nozzle section. can also be prevented.

As shown in Figure 1 (2)--, the dispersed air flow of thermoplastic particles is preferably a uniform empty conical flow [7]. In this case, the dispersion of thermoplastic particles (the flow does not have to be an empty conical flow, but rather a jet nozzle with a cooling socket provided through a gap on the outer periphery or a cooling jet with a cooling socket provided through a gap on the outer periphery). If it is a device that heat-treats the dispersion airflow of thermal Qf plastic particles ejected from the jet nozzle 1 which is equipped with a h'ket and has a slit at the tip, there is a young fruit.It is more preferable to dispersion of thermoplastic particles. It is preferable to eject the airflow while swirling near the inner wall of the nozzle.This is because the distribution of particle concentration in the ejected empty conical flow is uniform, making it possible to make the heat treatment state uniform in the heat common area. It is thought that this is because of this.

In the apparatus shown in FIG. 1, the ejection angle of the riZj9 conical flow 12 almost coincides with the spread angle θ at the tip of the ejection nozzle, but the preferable range of θ and [2] .

The cooling medium that flows through the cooling jacket is 1).

℃ it's water q... and it's a good luck plan Z', °A ward + 3'
4r-Good. 1. Also, the temperature of the compressed air discharged from the slit 9 is below 1°C, the jet flow has a turbulence of 10 to 40 m/S, and the gap between the slits is 1J, 3 to 2. OmriO is preferable, and it minimizes the air flow rate of the air curtain relative to the dispersion airflow 1, and prevents the temperature distribution around the heat-separating part from being disturbed and the efficiency to decrease. Adhesion and fusion can be prevented.

FIG. 2 is a top plan view of the device shown in FIG. 1;
This figure shows how a dispersion airflow of thermoplastic particles dispersed by an ejector is tangentially blown into the swirling chamber 3 and swirled.

Further, FIG. 3 shows a longitudinal sectional view showing another form of the heat treatment apparatus of the present invention. In the device shown in FIG. 3, the tip of the cooling jacket j has an acute angle, and this angle is parallel to the blowing angle of the hot air stream. In this way, turbulence of the hot air flow is prevented, the heat treatment effect is improved, and particles are prevented from adhering to the tip of the jacket 5.

FIG. 4 shows the heat treatment G tf'i of the thermoplastic particles of the present invention.
This is a representative flow diagram of a situation using . .

11 made with ejectors 15 and 16! ! Of Plastics XM
The dispersed airflow of the child is swirled in the swirling chamber 3, and is ejected from the lower part of the swirl/slip 4 to form a protrusion 11111 flow 12. C
The hot air heated by the heater 20 in the airflow 12
, 1.1 blows in the direction of the arrow and performs thermal association γ
Sign. At this time (near the 11111 wall, cooling/jt 22 was introduced from the upper part of the side wall, and the spherical hot hole J
' I-type particles p-1 are cooled by this cooling air 22 and are then collected by the cyclone 2'1 through the exhaust port and collected by the dust collector.
．． Ru.

As described in detail above, the heat treatment apparatus of the present invention completely prevents the adhesion or thermal adhesion of plastic particles to the inner wall surface and tip of the dispersion nozzle, and continues for a long period of time. Operation, crow yield, and commercial sedentary properties can be coupled.

[Brief explanation of drawings]

FIG. 1 shows an example of a device for blowing out a dispersion gas containing thermo-El plastic particles according to the present invention.
Figures 1 and 2 are views of the apparatus shown in Figure 1 seen from the main side, Figure 3 is a vertical cross-sectional view showing one form of the field of the heat treatment apparatus of the uninvented method, and Figure 4 is the heat treatment of the present invention. This is an example of a flow diagram when the device Ic is used. 3... Whirlpool 1 [chamber 4... Spray nozzle 5
...cooling jacket 9.・Slit j5...Ejector mixing chamber 1b...Esector no, funnel part 2G
・・Heater 2”・・Hirojo Buried・Emission・・・Cyclone δ・・Dust collector 26・・・Water filling equipment・・・・
6. Compression Sorry, 29.30...Grower's Agent, Kuwahara Kumi Procedural Amendments, Commissioner of the Patent Office, Stone Carving, 0, 1 Case Indication, 1988 Patent Application No.! :L(R06':1 No. 2 Name of the invention: Powder Salary No Sodokoto Den! 3 Relationship with the supplementary case Patent applicant's address 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name Name (127J Konishiroku Photo Industry Co., Ltd.
Words: Ji4 Agent: 191 Address: Sakura-cho, Hino-shi, Tokyo @ Jikonishiroku Photo Industry Co., Ltd. (C6 Nebutai 2 text) Liao) B Moon O F3 J Sai (7) r, C6 B Moon Rabbit p' theory a month, seven views and drawings 7, correction details (1) B month j
, 'Kennoro, 5 <x) aPliffl@2hi9 Page 34-3
-1s r:? , e i 6d yu to ! 5
5 r5or≦e≦qd, x tszv b. ■ -8?1 Reprimand α゛year 3 As per the distribution side, the engraving of the corrected YL drawing (no change in content) Figure 1 Figure 3 F Procedural amendment (method) % formula % 1. Indication of the incident 1977 Patent Application No. 219069 2, Name of the invention Powder heat treatment device 3, Relationship with the amended case Patent applicant address 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name
<127) Representative Director of Roku Konishi Photo Industry Co., Ltd.
Megumi Ide, 4, Agent Address: 1-6 Sakura-cho, Hino-shi, Tokyo Address: 1-6 Sakura-cho, Hino-shi, Tokyo Target of amendment Drawings of the procedural amendment submitted on March 13, 1980 (No. 1)
, Figure 3) 7. Engraving of the drawings containing the content of the amendment (no changes to the content).

Claims (3)

[Claims] (1) In a heat treatment device that heat-treats powder in an air stream,
1. A heat treatment apparatus for powder, characterized in that a cooling jacket is provided on the outer periphery of a jetting nozzle for dispersing powder, and a gap is provided between the jetting nozzle and the cooling jacket. (2) The powder heat treatment apparatus according to claim 1, wherein the void is used as a slit to form an air curtain around the outer periphery of the dispersion nozzle tip of the powder dispersion airflow. (3) The apparatus for heat treatment of powder according to claim 1 or 2, wherein the heat treatment causes the dispersed air flow of the powder to form a uniform empty cone.