JPS5959410A - Spheroidizing device of thermoplastic grain - Google Patents

Abstract

PURPOSE:To form spheroidized thermoplastic resin simply and quickly by a method wherein thermoplastic grain dispersing air flow is blown from the upper wall part of a granulating tower into compressed hot air flow and cold air is supplied into the granulating tower. CONSTITUTION:When heated air 33 is ejected from a supply pipe 14 and thermoplastic grain dispersing air flow 34 is blown from a thermoplastic grain supply device into compressed hot air flow 33 through an introduction pipe 20, a distribution pipe 21, the thermoplastic grain dispersing air flow is heated in collision with the hot zone of the compressed hot air flow 33 near the inlet 25 of the granulating tower 13 shielded from the open air. Accordingly, the thermoplastic grains are softened, fused quickly and uniformly, the softened layer of the grain surfaces receives surface tension and is sent to the exhaust port 26 of the granulating tower 13 formed into uniformly globose grains. Since the side wall 28 of the granulating tower 13 is cooled partially, the grains are not fused or massed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in an apparatus for spheroidizing thermoplastic particles such as resin particles and colored resin particles.

[Technical background of the invention and its problems]

Conventionally, this type of spheroidization method has been carried out by floating thermoplastic particles in a fluidized bed in a hot atmosphere for a certain period of time, by dropping the particles into a heated cylinder, or by using water or organic particles. A wet method is used in which a solute dispersed or dissolved in a solvent is atomized in a hot atmosphere, and after the solvent is evaporated, spherical solute particles are obtained.

However, in the former dry method mentioned above, it is difficult to keep the particles individually separated in a predetermined space for a certain period of time, and when obtaining particles with a particle size of 100 μm or less, During the spheroidizing operation, particles may fuse together to form agglomerates and adhere to the container wall, resulting in non-uniformity in the degree of spheroidization and a significant drop in yield.

On the other hand, in the latter wet method, even if the diameter is F in the dryer method (-1:spt/-), homogeneous outer spherical particles are expended over a wide range from tg to several hundred μm. i have the advantage of However, until the treated particles are dried (18), most of the solvate contained in the particles must be evaporated, so a vast drying room is required. If the evaporative melt No. 11 is other than water, the number 1 f?, will increase in size, and if the evaporative melt No. mosquito,
There are issues that involve risks such as fire and antecedents.

For this reason, it is not shown in the first tN2+ that the terminal 9
′! A device for spheroidizing arcuate particles has been developed. That is, 1 in Fig. 1 is a granulation tower, and the upstream of the granulation tower 1, (is a pressurized hot air stream and a thermoplastic i4:, an evil particle dispersion air stream is bll).
.

Is the inlet 2 opened and 'T'? !
Ball for li! A 4.f1 outlet 3 is formed from which the particles are discharged. Immediately above the inlet 2 of the prefabricated column 1, a pressurized hot air stream is introduced into the , a supply pipe 4 is installed to eject water toward the inlet 2.In addition, on the upper wall of the granulation tower 1 around the inlet 2, there is a
Shearing 1 Distribution in which f1 particle dispersion airflow is blown into the pressurized hot airflow? ? 5 is installed, and the distribution pipe 5 is arranged concentrically with respect to the supply pipe g4 so that a gap 6 is formed between it and the supply pipe 4 through which the cooling air of the adiabatic reservoir flows. . Furthermore, a groove 7 is cut in the lower part of the inner cylinder of the distribution pipe 5 for blowing the thermoplastic particle dispersion air stream into the pressurized hot air stream. Further, an introduction pipe 8 for introducing a thermoplastic particle dispersion airflow is connected to the distribution pipe 5.

According to the spheroidizing device shown in FIG. 1 described above, the supply pipe 4
When the pressurized hot air stream 9 is ejected from the inlet pipe 8 and the thermoplastic particle dispersion air stream 10 is blown into the pressurized hot air stream 9 through the distribution pipe 5 from the inlet pipe 8, the inlet 2 of the granulation tower 1 isolated from outside air is blown. Nearby, the dispersed airflow 1θ is impacted and mixed into the high temperature region of the pressurized hot airflow 9. As a result, the thermoplastic particles are quickly and uniformly softened and melted, and the softened layer on the surface of the particles is subjected to the action of surface tension, making it possible to obtain uniformly spherical particles.

However, in the spheroidizing apparatus shown in FIG. This has the disadvantage that it adheres to the inner wall surface and deposits, resulting in a decrease in the production yield of thermoplastic particles by 1 degree. For this reason, it is conceivable to increase the diameter of the granulation tower to suppress the adhesion and accumulation of spherical thermoplastic particles to the inner surface of the side wall of the granulation tower. However, when increasing the diameter of the granulation tower,
A new drawback arises in that the device itself becomes larger.

[Purpose of the invention]

The present invention makes thermoplastic particles extremely
The object of the present invention is to provide a compact and simplified spheronization device that can spheroidize particles into particles with a high yield.

[Summary of the invention]

The present invention relates to a granulation tower and the construction of the earthen walls of this granulation tower.

The pressurized hot air flow supply section I is arranged near the earthen wall of the above-mentioned construction O.
and a dispersion air flow supplying member that blows a thermoplastic particle dispersion air flow into the 1-pressure hot air flow, and by providing a cooling outside air inlet in the granulation tower, the wall surface of the granulation tower is covered by the air from the inlet. By cooling, the adhesion and accumulation of spherical thermoplastic particles to the inner surface of the side wall of the granulation tower can be suppressed without increasing the diameter of the granulation tower, and the yield of spherical thermoplastic particles can be increased. The aim is to improve the size and make it more compact.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 2 to 4.

Figure 2 is a schematic diagram showing the spheroidization system, and 1 in the figure
1 is a blower fan υ, and this blower fan 11 has an air volume of 0.
．． 1-5 m3/min, wind pressure 100-2000
It may be within the range of mmp and g. This blower fan 11 is connected to a heat exchanger 12. Heat exchanger 1 with
2 may be either a direct heating type or an indirect heating type, but an electric heater with easy temperature control is preferable. -For example, three-phase, 200■, 4K that generates high temperature of about 600℃
A heat exchanger 12 incorporating a W electric heater was used. This heat exchanger 12 has a supply pipe 1 extending directly above the granulation tower 13.
It is connected to 4. Such a blower fan 11. The heat exchanger 12 and the supply pipe 14 constitute a pressurized hot air supply section. Note that the temperature of the pressurized hot air stream is adjusted by installing a temperature sensor such as a thermocouple at the outlet of the heat exchanger 12, and adjusting the air flow to the east of the air heater or the fan 11 based on the temperature detection signal from the sensor. This is done by discounting +.

In the figure, 15 is a compressor, and this compressor 15 has an air flow rate of 0.1 to 2 m3/min and a pressure of 0.
．． Anything in the range of 0.05 to 5 Kf/au 2 is fine. The compressor 15 is connected to a thermoplastic particle supply mechanism 16. This supply 4'l: Mpak') 16 is provided with a main body 17, an ejector 18 inserted into this main body 17 and into which compressed air from the front congressor is introduced, and a lower 3;1^ attached to the main body. The opening 141 (is the ejector 1
W1 near the spout of 8. It consists of 19 words. Said;]: ]tsu/-? 1! Thermoplastic particles are stored in the main body 17, and when compressed air from the compressor 15 is supplied to the ejector 18, the thermoplastic particles are suspended in the main body 17, and a thermoplastic particle dispersion airflow is generated. be done. The concentration in such a dispersed air stream is
When using thermoplastic particles of μm or less, 2 KIIic
nr' or less, preferably in the range of 50 to 500y-/Cn13. The reason for this is that the dispersion concentration is 2 KQ/n+3
If the temperature exceeds 0, the softened particles tend to fuse together and form agglomerates when formed into spheres in a pressurized hot air flow. It is connected to a hollow annular distribution pipe 21 via an introduction pipe 20. The distribution pipe 21 is arranged concentrically with respect to the supply pipe 14 so that a gap 22 is formed between the distribution pipe 21 and the supply pipe 14 through which the cooling air from the adiabatic reservoir flows. It is desirable that the gap 22 be wide. If it is too wide, too much cooling air will be introduced and the temperature at the time of spheroidization will drop, resulting in poor spheroidization efficiency. On the other hand, if the gap 22 is narrow, the introduction of cooling air will not be sufficient and the distribution pipe 21 will be heated, causing thermoplastic particles to fuse to the inner wall of the distribution pipe 2 and causing the grooves described later to become cold. . Therefore, the gap 22 is the supply pipe 1
It is preferable that the outer diameter is about 173 to 115 compared to the outer diameter of 4.

Furthermore, grooves 23 are cut in the lower part of the inner cylinder of the distribution pipe 21 for blowing the thermoplastic particle dispersion airflow into the pressurized hot airflow from the supply pipe 14.

These grooves 23... direct the thermoplastic particle dispersion airflow at an angle of 15° to 90°, preferably 30° to the pressurized hot airflow.
It is desirable to design the blowing at an angle of 60° to 60°. The reason for this is that when the blowing angle is less than 15°, the mixing ratio of the thermoplastic particle dispersion air stream into the pressurized hot air stream becomes poor, which reduces the efficiency of spheroidization. In particular, if the lower limit of the angle is set to 30°, it becomes possible to make the thermoplastic particles spherical without setting the pressurized hot air flow to a high temperature. On the other hand, if the blowing angle exceeds 90° and the distance between the supply pipe 14 and the groove 23 of the distribution pipe 21 becomes close, the opening of the supply pipe 14 will be blocked by the fusion of thermoplastic particles. There is a risk of In particular, if the upper limit of the angle is 60°,
Even if the supply pipe 14 and the grooves 23 of the distribution pipe 21 come close to each other, the supply pipe 14 can be prevented from being blocked.

Further, the positions of the supply pipe 14 and the grooves 23 of the distribution pipe 21 differ depending on the flow rates of the pressurized hot air flow and the thermoplastic particle dispersion air flow, but the tip of the supply pipe 14 is connected to the groove 23 of the distribution pipe 21.
It is desirable to set the position of . . . 1 to 20 mm above. The reason for this is that if the temperature is less than 1, thermoplastic particles will fuse to the opening of the supply pipe 14, causing a blockage phenomenon.
On the other hand, if the temperature exceeds 20 degrees, thermoplastic particles tend to fuse to the outer surface of the supply pipe 14 and close the gap 22, blocking the flow of cooling air.
This is because it may lead to blockage, etc.

Note that the above-mentioned compressor 15, thermoplastic particle feeder 416, introduction pipe 20, and distribution pipe 2 constitute a thermoplastic particle dispersion and supply member.

Furthermore, as shown in FIGS. 3 and 4, the granulation tower 13 is provided with pressurized hot air 1'T and thermoplastic particle dispersion on the upper wall 24 where the supply pipes 14 and distribution pipes 21 of the respective supply members are disposed. It has an inlet 25 through which air flows in, and has a tapered lower side and an outlet 26 at the lower end through which spherical thermoplastic particles are discharged. Earthen wall 2 of the granulation tower 13
A plurality of, for example, 16, upper inlet ports 27 are bored in the periphery of the granulation tower 13, and a plurality of, for example, six upper inlet ports 27 are bored in the upper part of the side wall 28 of the granulation tower 13. A section introduction port 29... is provided. The upper inlet port 27...
The position of . is most effective at the upward movement 724 near the side wall 28, and is not preferred if it is close to the distribution pipe 21 because it lowers the efficiency of spherical formation. For this reason, the upper inlet port 27...
・The digit 1' is 0 to 10 m from the inner surface of the fil wall 28.
It is desirable to have 24 parts of the earthen wall about m in length. The larger the size of the inlet 27, the better the cooling effect, but making it too large is not preferable because it reduces the efficiency of spherical formation. It is appropriate that the size is 115 to 1/20 of the diameter of the granulation tower 13. Also, since the side inlet 29 has the purpose of lowering the temperature of the entire granulation tower 13, It is desirable to select the location and size of the hole so as not to deteriorate the efficiency of molding.

Furthermore, the discharge port 26 of the granulation tower 13 is connected to a leak valve 30.
The separation and recovery member 31 is connected to the separation and recovery member 31 via a blower 32, and air is supplied to the separation and recovery member 31 by a blower 32.

The leak pulp 3Q has the function of lowering the temperature of the separation and recovery member 31 to near the outside temperature, thereby preventing thermoplastic particles from forming agglomerates within the recovery member 31.

Next, the operation of the spheroidizing device shown in FIGS. 2 to 4 will be explained.

First, operate the valve P') 11 to transfer compressed air to the heat exchanger 12.
At the same time, the compressor 15 is operated, and the thermoplastic particle supply mechanism 16 is heated through the introduction pipe 20. When a thermoplastic particle dispersion airflow 34 is blown into the pressurized hot airflow 33 through the distribution pipe 21, heat 1 is distributed to the high temperature region of the pressurized hot airflow 33 near the inlet 25 of the granulation tower 13, which is blocked from outside air.
Both of the particle-dispersed air currents collide and mix. As a result, the thermoplastic particles are slowly and uniformly softened and melted, and the softened layer on the particle surface receives surface tension, becoming uniformly spherical particles and being sent to the outlet 26 side of the granulation tower 13. It will be done. In this spheroidization process, the upper inlet 27 is provided at the periphery of the earthen wall 24 of the granulation tower 13, so that the pressurized hot air flow 33 is ejected into the granulation tower 13. Outside air is introduced from the upper air inlet 27 along the inner surface of the wall 28. As a result, the side wall 28 of the JI particle tower 13 is locally cooled, so that the spherical thermoplastic particles
The yield of thermoplastic particles is significantly improved by suppressing agglomeration by f6/11 arrival at F8. Moreover, the spherical overstone! , □+u'l is also applied to the upper part of the side plate 28 of the granulation tower 13.
+'tl!・Since the temperature 29... is provided, the temperature rises due to the pressurized hot air flow 33 and lowers the entire temperature inside the granulation tower 13, suppressing the fusion of the spherical thermoplastic particles with each other. At the same time, the temperature inside the collection unit 31 to which the thermoplastic particles are sent from the discharge port 26 can be reduced.

As a result, the production yield of spherical thermoplastic particles t'j is improved also by providing the side introduction ports 29.

Therefore, the present invention has various effects as listed below.

(1) It is possible to obtain a large amount of J''-J quality thermoplastic particles with a significantly high degree of sphericity and a short F1 between them.

(2) During the spheroidization operation, it is possible to suppress agglomeration due to fusion of particles and adhesion to the inner surface of the side wall of the granulation tower, so it is possible to improve the yield and simplify the processing.

(3) Since it is possible to suppress the sticking of thermoplastic particles to the inner surface of the side wall of the ``li1 granulation column and agglomeration, the granulation column can be made smaller compared to the spheroidization apparatus shown in Figure 1, and the apparatus σ itself can be made smaller. Can be made into smaller parts.

In the above embodiment, the inlet was provided in both the soil wall and the side wall of the granulation tower, but the inlet may be provided in only one of them. However, sticking of thermoplastic particles to the inner surface of the side wall of the granulation tower,
From the viewpoint of effectively suppressing agglomeration, if an inlet is provided only on one side, it is desirable to provide it on the earthen wall of the granulation tower.

Further, in the above embodiment, the granulation tower was constructed of a single container, but it may be constructed of a double container as shown in FIG. That is, 13' in FIG. 5 is a granulation tower, and the granulation tower 13' has an outer container 35 whose upper surface is open and which has an outlet 26' for spherical thermoplastic particles at its lower part. We are prepared. A side introduction port 29' is formed in the upper part of the side wall of the outer container 35. Further, a seven-rung section 36 having a step is provided at the upper end of the outer container 35, and a cylindrical inner portion is provided inside the outer container 35, which is locked by the step of the seven-rung section 36. A container 37 is removably housed. Further, at the upper end of the outer container 35, an upper inlet 27' is provided at the periphery.
A lid body 38 with openings is attached to the lid body 38. According to the configuration shown in FIG. 5, the inner surface of the inner container 37 is connected to the upper inlet 27' of the lid body 38 during the spheroidizing process.
The container 37 is cooled by outside air introduced from the container 37.
The outer surface of the outer container 35 is cooled by outside air introduced through the side inlet 29' of the outer container 35. The granulation tower 13' for spherical thermoplastic particles is cooled from both the
The sticking to the side wall of the thermoplastic particles can be suppressed, and the yield of thermoplastic particles can be further improved. Moreover, since the inner container 37 is detachably housed in the outer container 35, even if thermoplastic particles adhere to the inner container 37, the granulation tower 13'
The granulation tower 13 can be cleaned more easily than the granulation tower 13 shown in FIGS. 3 and 4, and the operability can be significantly improved.

Next, the operation of spheroidizing thermoplastic particles using the spheroidizing apparatus shown in FIGS. 2 to 4 and FIG. 5 will be specifically explained as an experimental example.

Example First, as shown in FIGS. 2 to 4, air is sent to an electric heater type heat exchanger 12 using a blower fan 1 and heated for approximately 50 minutes.
0℃t 500 mmAy t 1 m'Ain A pressurized hot air stream 32 is sent to the supply pipe (diameter 23mm) 14, and the supply pipe 14 is granulated with a diameter of 3mm and a length of 5mm.
It erupted towards 3. The upper wall 24 of the granulation tower 13 has 16 upper inlets 27 with a size of 5 mm φ, and the side wall 28 has 16 side inlets 29 with a size of 2 mm φ. 4 are provided at equal intervals.

On the other hand, the compressor 15 is operated to produce 0.5 Kg/ly
n'' of compressed air is sent through the thermoplastic particle supply mechanism 16 and the introduction pipe 20 to a distribution pipe 21 with an outer diameter of 4 Q mm and an inner diameter of 30 mm, and a groove (gap of 2 mm) 23 in the distribution pipe 21.
・Compressed air was blown out at a flow rate of 0.2 m3/min. At the same time, operate the blower 32.
By supplying air at a flow rate of n and adjusting the saw 2 pulp 3o, the temperature inside the separation and recovery member 3 was set to 60° C. or lower.

Next, styrene-acrylic copolymer resin (softening point 140
80 parts by weight of polyethylene wax, 10 parts by weight of polyethylene wax, and 10 parts by weight of Kazenbranok, and then crushed and classified into 2 parts. A black toner with a particle diameter of about 10 μm obtained by this was put into the thermoplastic particle supply mechanism 16, 19. , giving vibration force 2
The toner is dropped into the ejection part of the ejector 18 of the main body 17 at a supply rate of 0%/mIn, and a thermoplastic particle dispersion air stream 33 with a particle dispersion concentration of 100 g/m3 is blown into the pressurized hot air stream 32 from the distribution pipe 21 to make the toner into a ball. I made it into a model.

The obtained black toner was almost spherical, and the degree of sphericity was also extremely high, with a shape factor close to 1. Furthermore, no mutual baby booming of spherical tones was observed.

Moreover, almost no toner was observed to adhere to the inner surface of the side part 28 of the granulation tower 13, and the yield was maintained at 85 inches or more. On the other hand, the third
When toner was spheroidized under the same conditions using the spherical device shown in FIG. There was a lot of toner adhesion, and the yield was as low as 70 cm at maximum.

Example Similar to Experimental Example 1, using the granulation tower 13 shown in FIGS. 3 and 4, the capacity of the heat exchanger 12 was increased and a pressurized hot air stream 32 of approximately 600° C. was jetted out through the supply pipe 14. When the black toner prepared in the same manner as in Experimental Example 1 was made into a sphere, the degree of sphericity was extremely high. What is the shape factor of all 1. Y, I was able to obtain 1 true sphere tona.

Example Using the spheroidizing device shown in FIGS. 2 and 5, air was sent to an electric heater type heat exchanger 12 using a blower fan 11 and heated to about 600° C. and 1000 mm A4 g 20 m37.
A pressurized hot air flow 32 of min.
It was injected into the first column 13' shown in FIG. This granulation tower 13' has a diameter of 1o.

Outer container 35 with mmφ, length 400wn and diameter 8゜ orderφ
, and an inner container 37 with a length of 300 mm.

In addition, the container body 38 that caps the outer container 35 has 16 upper inlet ports 27' each having a size of 5 mm φ, and the outer container 35
At the top of the side wall 28' is a side inlet 2 with a diameter of 36 mm.
There are 4 pieces each for 9 mice.

On the other hand, operate Combesano 5, 10"9/L:1
n2 compressed air is passed through the thermoplastic particle supply mechanism 16 and the introduction pipe 20 to a distribution pipe 21 with an outer diameter of 30 mφ and an inner diameter of 15 mφ.
The groove of the distribution pipe 21 (gap 1 mm) 23
・=yoV) Compressed air was blown out at a flow rate of 0.5 m"/ndm. At the same time, the blower 32 was operated, and the
Air was supplied at a flow rate of min. At this time, the separation and recovery unit 31
The temperature in the upper inlet 27' provided in the granulation tower 13'...
Cooling air was introduced through the side inlet 29' and was sufficiently cooled to below 50°C.

Next, borri propylene wax (softening point 170°C) 3
20 parts by weight of ethylene-vinyl acetate copolymer resin, 45 parts by weight of magnetic powder, and conductive car? black 5
Parts by weight are heat-kneaded, pulverized and classified into 2 parts to obtain a particle size of approximately 15 μm.
A magnetic toner (thermoplastic particles) was prepared. Next, this magnetic toner is transferred to the hot spring 19 of the thermoplastic particle supply mechanism 16.
The thermoplastic particle dispersion airflow 33 with a particle dispersion concentration of 200 f/m" is sent from the distribution pipe 21 to the Calo pressure The magnetic toner was blown into a hot air stream 32 to form a spherical shape.

The obtained magnetic toner was mostly spherical, and the degree of sphericity was also extremely high, with a shape factor close to 1. In addition, we investigated the fluidity of the magnetic toner before and after the spheroidization process by measuring the angle of repose ψγ.
Before spheroidization, the toner had an angle of repose ψγ = 56° and had poor fluidity, whereas the magnetic toner processed to spherical shape by this device had a remarkable angle of repose ψγ -37°. 151f,・
[(Improvement in health was observed.

Furthermore, when the granulation tower 13' shown in FIG. was able to improve significantly.

Example Styrene resin (softening point: 150°C) was crushed and classified into 2 parts. Approximately 20 thermoplastic particles were prepared, and a pigment was added to the particles and adhered to the surface of the particles. Next, when these particles were made into spheres by the same loading and operation as in Experimental Example 3, the pigment was fused to the particle surface at the same time as the particles were made into spheres, and spherical colored particles were obtained.

Example F+? A resin (softening point: 130°C) was crushed and classified into two to produce thermoplastic particles of approximately 30 μm, and conductive powder (
Carbon black) was added and thoroughly mixed to adhere to the particle surface. Next, when these particles were made into nine spheres using the same equipment and operation as in Experimental Example 3, carbon black was fused to the particle surface at the same time as the particles were made into spheres, yielding spherical conductive particles. .

Example Grind polyamide resin (softening point 117℃).

The particles were classified to produce thermoplastic particles of about 50 μm, to which magnetic powder (triiron tetroxide powder) was added, thoroughly mixed, and adhered to the surface of the particles. Next, the particles were sphericalized using the same equipment and operation as in Experimental Example 3, and the triiron tetroxide powder was simultaneously fused to the surface of the particles to obtain spherical magnetic particles.

Note that the thermoplastic particles sphericalized by the spherical device of the present invention are not limited to those used in the above experimental examples. For example, natural resins such as rosin, copal, -7 Elaf, or solid paraffin 2 various types of acrylic hiIDM t polyethylene,
Polyester, maleic acid resin, coumaron resin, polyurethane resin.

Phenol resin, polycarbonate <itJ resin, vinyl acetate resin, vinyl chloride resin, 7j? Synthetic resins such as polyvinylidene chloride resin, polyvinyl butyral, and mortar ether resin, or mixtures or combinations of these resins can be used. Pigments, various fillers, dyes, etc. shown in the experimental examples may be added to such '#L:l fat.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to prevent agglomeration due to fusion of particles, and it is possible to obtain homogeneous spherical particles with an extremely high degree of sphericity in a large amount and in a short time. It is possible to provide a sphere 1i device that can suppress or prevent adhesion of spherical particles to the inner surface of the side wall of a particle column and greatly improve the production yield.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of a conventional spheroidizing device, Fig. 2 is a schematic diagram of a spherical forming device showing an embodiment of the present invention, and Fig. 3 is a sectional view of the spheroidizing device shown in Fig. 2. A plan view showing the key@coma, Figure 4 is the 3rd
FIG. 5 is a cross-sectional view of a main part of a spheroidizing device showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 11...Blower fan, 12...Heat exchange heating/cooling, 13° 13'... Granulation tower, 14... Supply pipe, 15... Compressor, 16... Thermoplastic particle supply mechanism, 21・
...Distribution pipe 1. ? $j'tl)'Exit, 27, 27'
...Top "inlet, 29, 29'...Side inlet, 3
1... Separation and recovery section body, 32... Pressurized hot air flow, 33
...Heat"1t! J/J, Els % child dispersion airflow, 3
5... Outer container, 37... Inner container, 38... Lid body・ Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 3 Figure 272227 Figure 4

Claims (5)

[Claims] (1) A granulation tower having an inlet near the center of the earthen wall through which the pressurized hot air flow and the thermoplastic particle dispersion air flow are introduced, and an outlet at the bottom from which the spherical thermoplastic particles are discharged;
a pressurized hot air flow supplying member disposed near the earthen wall of the granulation tower that blows out a pressurized hot airflow; 1. A device for spheroidizing thermoplastic particles, comprising: a dispersion air flow supply section for blowing a thermoplastic particle dispersion air flow into a hot air flow, and an outside air inlet for cooling provided in the granulation tower. (2) The pressurized hot air flow supply member is composed of a supply pipe extending in the central axis direction of the granulation tower, and the thermoplastic particle dispersion air flow supply member is composed of distribution pipes arranged concentrically with respect to the supply pipe. 2. The device for patterning thermoplastic particles according to claim 1, wherein a gap is formed between the supply pipe and the distribution pipe through which cooling air flows. (3) The apparatus for spheroidizing thermoplastic particles according to claim 1 or 2, characterized in that a plurality of outside air inlets for cooling are provided at the periphery of the earthen wall of the granulation tower. (4) A plurality of outside air inlets for cooling are provided on the periphery of the soil wall of the granulation tower, and the upper part 11 of the granulation tower is provided with a plurality of outside air inlets for cooling. The device for spheroidizing thermoplastic particles as set forth in item 1 or 2 of the scope of the special edition, characterized in that a double cone is provided in llF. (5) The granulation tower includes an outer container having an open upper surface and an outlet for spherical thermoplastic particles at the lower part, a cylindrical inner container that is removably housed in the outer container, and the outer container. a lid that is removably attached to the upper end of the container and has an inlet near the center through which pressurized hot air and thermoplastic particle dispersion air flow; The device for spheroidizing thermoplastic particles fl"i) according to claim 1J() or claim 2, characterized in that external air inlets for cooling are provided at the periphery and the peripheral edge, respectively.