JP2016174984A - Synthetic resin pulverizing method and synthetic resin pulverizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin pulverizing device capable of efficiently pulverizing powder and granular synthetic resin materials.SOLUTION: A synthetic resin pulverizing device to pulverize powder and granular synthetic resin materials comprises: a swelling treatment section A to upswell the materials by immersing the same in swelling solvent; a freezing treatment section B to freeze the solvent in the materials swelled by the swelling treatment section by cooling the same; and a pulverizing treatment section C to pulverize the materials with the solvent therein frozen.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pulverization method for synthetic resin in which a powdery raw material of synthetic resin is pulverized and pulverized, and a pulverization apparatus for synthetic resin that performs the pulverization method for synthetic resin.

  As a conventional example of such a pulverization method for synthetic resin, a raw material consisting of pellets of low density polyethylene as a powdery raw material of synthetic resin is supplied to a cooling tank in which liquid nitrogen is stored so as to be below the embrittlement temperature. There is one that cools and supplies liquid nitrogen mixed with raw material to a fine pulverizer (turbo-type fine pulverizer) to finely pulverize the raw material (for example, Patent Document 1 (paragraphs [0003] to [0003] to [0003] 0006], FIG. 4))).

JP-A-6-206003

  In the pulverization method for synthetic resin of Patent Document 1, the raw material is cooled to a low temperature so as to increase the brittle fracture property of the raw material to facilitate the pulverization of the raw material, but the pulverization of the raw material cannot be performed efficiently. It was a thing.

  In other words, by cooling below the embrittlement temperature and weakening the strength of the synthetic resin as a whole, the raw material can be easily pulverized, but the synthetic resin having a uniform structure with molecular chains bonded is Since it is difficult to crack even if it is given, it is not easy to sufficiently pulverize only by cooling below the embrittlement temperature, and the raw material cannot be efficiently pulverized.

This invention is made | formed in view of the said actual condition, The objective is to provide the fine powdering method for synthetic resins which can grind | pulverize the granular raw material of a synthetic resin efficiently.
Another object of the present invention is to provide a pulverizing apparatus for synthetic resin that can efficiently pulverize powdery raw material of synthetic resin.

The pulverization method for a synthetic resin of the present invention is a method of pulverizing and pulverizing a powdery raw material of a synthetic resin.
The raw material is immersed in a solvent for swelling treatment to swell, the swollen raw material is cooled to freeze the internal solvent, and the internal raw material frozen is pulverized.

  That is, first, the raw material is immersed in a solvent for swelling treatment to swell, so that the solvent enters between the molecular chains of the synthetic resin and loosens the bonds between the molecular chains.

Next, by cooling the swollen raw material and freezing the solvent inside, the volume of the solvent that has entered between the molecular chains of the synthetic resin is expanded by freezing, and micro cracks are generated inside the raw material. Let's make it.
Incidentally, when a raw material having a micro crack in the interior is subjected to an impact, it is in a state of being easily pulverized, for example, stress concentrates and cracks at the internal crack occurrence location.

Finally, the raw material with the internal solvent frozen, that is, the raw material with minute cracks inside, is pulverized in various forms, such as a jet mill that is a collision type pulverizer and a Linlex mill that is an impact type pulverizer. It grind | pulverizes, such as grind | pulverizing using a machine etc.
Since the raw material in which minute cracks are generated is easily pulverized, such as being easily broken when subjected to an impact, it can be pulverized efficiently.

  In short, according to the first characteristic configuration of the synthetic resin pulverization method of the present invention, the powdery raw material of the synthetic resin can be pulverized efficiently.

In addition to the first characteristic configuration of the above-described synthetic resin pulverization method, the second characteristic configuration of the synthetic resin pulverization method of the present invention,
The swollen raw material is cooled with a liquefied inert gas.

That is, the swollen raw material is cooled using the cold heat of the liquefied inert gas to freeze the internal solvent.
Since the liquefied inert gas has a sufficiently low temperature, for example, liquid nitrogen is about −196 ° C., the solvent inside can be accurately frozen while appropriately cooling the swollen raw material.

  In short, according to the second characteristic configuration of the synthetic resin pulverization method of the present invention, in addition to the operational effects of the first characteristic configuration of the synthetic resin pulverization method described above, the solvent inside the swollen raw material is accurately determined. The raw material can be efficiently pulverized while being frozen.

In addition to the first or second characteristic configuration of the above-described synthetic resin pulverization method, the third characteristic configuration of the crystalline synthetic resin pulverization method of the present invention,
The raw material in which the solvent inside is frozen is supplied to an explosion treatment space where the solvent is rapidly vaporized, and the raw material is exploded by vaporization of the solvent inside the raw material.

That is, the raw material frozen in the internal solvent is supplied to the explosion treatment space where the solvent is rapidly vaporized, and the internal solvent of the raw material is rapidly vaporized to explode the raw material.
Incidentally, the pulverized processed product produced by blasting the raw material is in a dry state because the solvent has already been vaporized.

  Since the solvent that swells the raw material is in a state of being uniformly dispersed throughout the raw material, when the raw material is blasted by vaporizing the solvent inside the raw material, the raw material is pulverized all at once. Thus, the raw material pulverization efficiency can be further improved.

  In short, according to the third characteristic configuration of the synthetic resin pulverization method of the present invention, in addition to the operational effect of the first or second characteristic configuration of the synthetic resin pulverization method described above, the raw material pulverization processing efficiency is further improved. While improving, a dried pulverized product can be obtained.

In addition to the first or second characteristic configuration of the above-described synthetic resin pulverization method, the fourth characteristic configuration of the synthetic resin pulverization method of the present invention,
The raw material in which the solvent inside is frozen is pulverized by a pulverizer, the pulverized processed product is supplied to a vaporization processing space for vaporizing the solvent, and the solvent contained in the pulverized processed product is supplied. It is characterized by vaporizing.

  That is, the raw material in which the internal solvent is frozen is pulverized by a pulverizer, and then the pulverized processed product is supplied to a vaporization processing space for vaporizing the solvent to vaporize the solvent contained in the pulverized processed product. Thus, a pulverized processed product in a dry state is obtained.

  That is, when the raw material in which the internal solvent is frozen is pulverized by a pulverizer, the pulverized processed product contains the solvent, but the solvent is vaporized to obtain a pulverized processed product in a dry state. To.

  In short, according to the fourth characteristic configuration of the synthetic resin pulverization method of the present invention, in addition to the operational effects of the first or second characteristic configuration of the synthetic resin pulverization method described above, the frozen raw material is supplied to the pulverizer. While being pulverized, a dried pulverized processed product can be obtained.

The pulverizing apparatus for synthetic resin of the present invention is for pulverizing and pulverizing a powdery raw material of synthetic resin, and the first characteristic configuration thereof is:
A swelling treatment part that swells the raw material by immersing it in a solvent for swelling treatment, a freezing treatment part that cools the raw material swollen in the swelling treatment part and freezes the solvent inside, and the freezing treatment part And a pulverization processing unit for pulverizing the raw material in which the solvent inside is frozen.

  Since the 1st characteristic structure of the pulverization apparatus for synthetic resins of this invention is equipped with the structure for implementing the 1st characteristic structure of the pulverization method for synthetic resins mentioned above, the pulverizing method for synthetic resins mentioned above The same effect as the effect described in the column of the first characteristic configuration is exhibited.

  That is, first, in the swelling treatment part, the raw material is immersed in a solvent for swelling treatment and swollen so that the solvent enters between the molecular chains of the synthetic resin and loosens the bonds between the molecular chains.

Next, in the freezing treatment section, the swollen raw material is cooled and the internal raw material is frozen, so that the volume of the solvent that has entered between the molecular chains of the synthetic resin is expanded by freezing. In addition, a minute crack is generated.
Incidentally, when a raw material having a micro crack in the interior is subjected to an impact, it is in a state of being easily pulverized, for example, stress concentrates and cracks at the internal crack occurrence location.

Finally, the raw material in which the internal solvent is frozen in the pulverization processing unit, that is, the raw material in which a micro crack is generated inside, for example, a jet mill that is a collision type pulverizer or a linlex mill that is an impact type pulverizer It grind | pulverizes, such as grind | pulverizing using various types of grinders.
Since the raw material in which minute cracks are generated is easily pulverized, such as being easily broken when subjected to an impact, it can be pulverized efficiently.

  In short, according to the first characteristic configuration of the synthetic resin pulverization apparatus of the present invention, the granular raw material of the synthetic resin can be efficiently pulverized.

In addition to the first characteristic configuration of the above-described synthetic resin pulverization apparatus, the second characteristic configuration of the synthetic resin pulverization apparatus of the present invention is:
The freezing treatment unit is configured to cool the swollen raw material with a liquefied inert gas and freeze it.

  Since the 2nd characteristic structure of the pulverization apparatus for synthetic resins of this invention is equipped with the structure for implementing the 2nd characteristic structure of the pulverizing method for synthetic resins mentioned above, the pulverizing method for synthetic resins mentioned above The same effect as the effect described in the column of the second characteristic configuration is exhibited.

That is, the freezing treatment unit cools the swollen raw material using the cold heat of the liquefied inert gas to freeze the internal solvent.
Since the liquefied inert gas has a sufficiently low temperature, for example, liquid nitrogen is about −196 ° C., the solvent inside can be accurately frozen while appropriately cooling the swollen raw material.

  In short, according to the second characteristic configuration of the synthetic resin pulverizing apparatus of the present invention, in addition to the operational effects of the first characteristic configuration of the synthetic resin pulverizing apparatus described above, the solvent inside the swollen raw material is accurately determined. The raw material can be efficiently pulverized while being frozen.

In addition to the first or second characteristic configuration of the above-described synthetic resin pulverization apparatus, the third characteristic configuration of the synthetic resin pulverization apparatus of the present invention,
The pulverization processing unit is configured to supply the raw material in which the solvent inside is frozen to an explosion treatment space where the solvent is rapidly vaporized, and to explode the raw material by vaporization of the solvent inside the raw material. It is in the point.

  Since the 3rd characteristic structure of the pulverization apparatus for synthetic resins of this invention is equipped with the structure for implementing the 3rd characteristic structure of the pulverization method for synthetic resins mentioned above, the pulverizing method for synthetic resins mentioned above The same effects as the effects described in the third characteristic configuration column are exhibited.

That is, the pulverization processing unit supplies the raw material in which the internal solvent is frozen to the explosion processing space in which the solvent is rapidly vaporized, and the internal solvent of the raw material is rapidly vaporized to explode the raw material.
Incidentally, the pulverized processed product produced by blasting the raw material is in a dry state because the solvent has already been vaporized.

  Since the solvent that swells the raw material is in a state of being uniformly dispersed throughout the raw material, when the raw material is blasted by vaporizing the solvent inside the raw material, the raw material is pulverized all at once. Thus, the raw material pulverization efficiency can be further improved.

  In short, according to the third characteristic configuration of the synthetic resin pulverization apparatus of the present invention, in addition to the operational effect of the first or second characteristic configuration of the synthetic resin pulverization apparatus described above, the raw material pulverization processing efficiency is further improved. While improving, a dried pulverized product can be obtained.

In addition to the first or second characteristic configuration of the above-described synthetic resin pulverization apparatus, the fourth characteristic configuration of the synthetic resin pulverization apparatus of the present invention,
The pulverization processing unit pulverizes the raw material in which the solvent is frozen in a pulverizer, supplies the pulverized processed material to a vaporization processing space for vaporizing the solvent, and is included in the pulverized processed material. The solvent is configured to vaporize the solvent.

  Since the 4th characteristic structure of the pulverization apparatus for crystalline synthetic resins of this invention is equipped with the structure for enforcing the 4th characteristic structure of the pulverizing method for crystalline synthetic resins mentioned above, the crystalline property mentioned above The same operational effects as the operational effects described in the column of the fourth characteristic configuration of the synthetic resin pulverization method are exhibited.

  That is, in the pulverization processing unit, the raw material in which the internal solvent is frozen is pulverized by a pulverizer, and then the pulverized processed product is supplied to the vaporization processing space for vaporizing the solvent and included in the pulverized processed product. The solvent is vaporized to obtain a pulverized processed product in a dry state.

  That is, when the raw material in which the internal solvent is frozen is pulverized by a pulverizer, the pulverized processed product contains the solvent, but the solvent is vaporized to obtain a pulverized processed product in a dry state. To.

  In short, according to the fourth characteristic configuration of the synthetic resin pulverization method of the present invention, in addition to the operational effects of the first or second characteristic configuration of the synthetic resin pulverization method described above, the frozen raw material is supplied to the pulverizer. While being pulverized, a dried pulverized processed product can be obtained.

The figure which shows the structure of the fine grinding apparatus for synthetic resins of 1st Embodiment. The figure which shows the structure of the pulverization apparatus for synthetic resins of 2nd Embodiment. The figure which shows the structure of the pulverization apparatus for synthetic resins of 3rd Embodiment.

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
(Overall structure of pulverization equipment for synthetic resin)
The fine pulverization apparatus for synthetic resin pulverizes and pulverizes the powdery raw material of the synthetic resin. As shown in FIG. 1, the swelling treatment unit swells the raw material by immersing it in a swelling treatment solvent. A, a freezing processing unit B that cools the raw material swollen in the swelling processing unit A and freezes the internal solvent, and a pulverizing processing unit that crushes the raw material in which the internal solvent is frozen in the freezing processing unit B C is provided.

  The freezing section B is configured to cool the swollen raw material with a liquefied inert gas and freeze the solvent inside.

  That is, the synthetic resin pulverizing apparatus of this embodiment swells by immersing the raw material in a solvent for swelling treatment, cools the swollen raw material, freezes the internal solvent, and supplies the raw material with the internal solvent frozen. A pulverization method for synthetic resin to be pulverized is performed. In addition, a pulverization method for synthetic resin is performed in which a swollen raw material is cooled with a liquefied inert gas.

  Examples of the synthetic resin used as a raw material include polyethylene (PE), polypropylene (PP), polyamide (nylon: PA), fluororubber, and fluororesin.

  By the way, when the raw material is polyethylene and polypropylene, acetone, toluene, benzene can be used as a solvent for swelling treatment, and when the raw material is polyamide (nylon), as a solvent for swelling treatment, Methanol and aniline can be used, and when the raw material is fluororubber or fluororesin, ethyl acetate, methyl ethyl ether, or diethyl ether can be used as a solvent for swelling treatment.

  The pulverization apparatus for synthetic resin of this embodiment is an apparatus that performs pulverization work in a batch processing form. For example, a raw material of 30 to 500 microns is pulverized into a pulverized processed product having a target particle size of about several microns. The configuration of each part will be described below.

(Structure of swelling treatment part)
As shown in FIG. 1, the swelling treatment section A is provided with a swelling treatment container 1 into which raw materials and a solvent for swelling treatment are charged, and a stirring blade 2 is provided inside the swelling treatment container 1. .
Then, the raw material and the solvent for the swelling treatment are put into the swelling treatment container 1, and the raw material is immersed in the solvent for the swelling treatment to swell.

  That is, the raw material and the solvent for the swelling treatment that are put in the swelling treatment container 1 are stirred with the stirring blade 2 until the set time for the swelling treatment (for example, several hours to several tens of hours) elapses. Is soaked in a solvent for swelling treatment to swell the raw material.

The swelling treatment container 1 is connected with a swelling discharge path 3 for discharging the swelling-treated raw material, and is provided with a swelling treated product discharge valve 4 for opening and closing the swelling discharge path 3.
Therefore, when the swelling process for the raw material charged in the swelling treatment container 1 is completed, the swollen material discharge valve 4 is opened, and the swollen raw material (hereinafter abbreviated as a swollen raw material) and the solvent are discharged into the swelling discharge path 3. It is comprised so that it can discharge | emit from the swelling processing container 1 through.

  A sieving portion 5 that performs a sieving action to separate the solvent and the swellable raw material from the swellable raw material and the solvent discharged from the swelling discharge passage 3 is provided in an inclined posture. The swollen raw material vibration feeder 6 is connected to convey the raw material.

  Accordingly, the sieving portion 5 is configured to cause the solvent to flow down to the lower solvent container 7 while vibrating together with the swollen raw material vibration feeder 6, and to pass the swollen raw material to the swollen raw material vibration feeder 6. The swollen raw material vibration feeder 6 is configured to convey the swollen raw material to the freezing treatment section B.

  Incidentally, a solvent return pump 9 for returning the solvent collected in the solvent container 7 to the swelling treatment container 1 through the solvent return path 8 is provided so that the solvent for the swelling treatment is reused.

(Configuration of the freezing section)
The freezing treatment section B includes a swollen raw material collection hopper 10 that receives and collects the swollen raw material from the swollen raw material vibration feeder 6, a freezing treatment container 11 that cools the swollen raw material and freezes the solvent inside, and the swollen raw material collection hopper 10. The swollen raw material supply path 12 for supplying the swollen raw material recovered to the freezing container 11, the swollen raw material supply valve 13 for opening and closing the swollen raw material supply path 12, and the frozen raw material discharge for discharging the frozen raw material from the freezing container 11 A frozen material discharge valve 15 that opens and closes the path 14 and the frozen material discharge path 14 is provided.

A nitrogen supply path 16 for supplying liquid nitrogen is connected to the freezing treatment container 11.
The nitrogen supply path 16 introduces liquid nitrogen sent from a liquid nitrogen supply source such as a liquid nitrogen cylinder. In the present embodiment, for example, a liquid of −200 ° C. and 1 MPa (N / mm ² ) is used. Nitrogen is introduced into the freezing treatment container 11 through the nitrogen supply path 16.
Further, the nitrogen supply path 16 is provided with a nitrogen supply valve 16 </ b> A so that the supply of liquid nitrogen to the freezing treatment container 11 can be interrupted.

The freezing container 11 is provided with a container pressure gauge 17 for measuring the internal pressure, and a container pressure adjusting valve 18 whose opening degree is automatically adjusted based on the detection result of the container pressure gauge 17. In order to maintain the internal pressure of the freezing treatment container 11 at a set pressure, the opening of the container pressure regulating valve 18 is automatically adjusted based on the detection result of the container pressure gauge 17.
The set pressure is, for example, about 0.2 to 0.3 MPa (N / mm ² ).

  That is, since the internal pressure of the freezing container 11 increases due to the evaporation of liquid nitrogen, the freezing container is discharged by discharging the gas inside the freezing container 11 to the outside by the container pressure regulating valve 18. 11 is configured to maintain the internal pressure below a set pressure.

  The freezing container 11 is provided with a heater 19 for heating the inside and a container thermometer 20 for detecting the temperature inside the container, and the heating power of the heater 19 freezes the solvent inside the raw material. It is configured to be controlled to maintain a target temperature (for example, −100 ° C.).

  Therefore, the freezing processing unit B opens the swollen raw material supply valve 13 with the frozen raw material discharge valve 15 closed, and supplies the swollen raw material recovered in the swollen raw material recovery hopper 10 to the freezing processing container 11; and By opening the nitrogen supply valve 16A and supplying liquid nitrogen to the freezing container 11, the swollen raw material is cooled with liquid nitrogen and the solvent inside the raw material is frozen.

Incidentally, while the swollen raw material is cooled with liquid nitrogen, each of the frozen raw material discharge valve 15, the swollen raw material supply valve 13, and the nitrogen supply valve 16A is maintained in a closed state.
When the freezing treatment of the solvent inside the raw material is completed, the frozen raw material discharge valve 15 is opened, and the raw material in which the internal solvent is frozen (hereinafter abbreviated as a frozen raw material) and liquid nitrogen are removed from the freezing treatment container 11. Will be discharged.

(Configuration of crushing section)
In the pulverization processing unit C, a vibration feeder 21 for vaporizing nitrogen for vaporizing liquid nitrogen while conveying the frozen raw material and liquid nitrogen discharged from the freezing processing container 11 is disposed in an inclined posture in a space opened to the atmosphere. A frozen material recovery hopper 22 for receiving and recovering the frozen material supplied from the nitrogen vaporizing vibration feeder 21 is provided.

  Therefore, the liquid nitrogen discharged from the freezing processing container 11 is vaporized while being transported by the nitrogen vaporizing vibration feeder 21, and the frozen raw material discharged from the freezing processing container 11 is stored in the frozen raw material recovery hopper 22. It is configured.

A first relay path 23 is connected to the lower part of the frozen material recovery hopper 22, and a relay container 24 for temporarily storing the frozen material supplied through the first relay path 23 is provided.
Incidentally, the first relay path 23 is provided with a first relay valve 23A that opens and closes the first relay path 23.

In addition, a second relay path 25 is connected to the lower part of the relay container 24, and a solvent vaporization container 26 for vaporizing the solvent inside the frozen raw material supplied through the second relay path 25 is provided.
Incidentally, the second relay path 25 is provided with a second relay valve 25A that opens and closes the second relay path 25.

Therefore, the swollen raw material recovered in the frozen raw material recovery hopper 22 can be transferred to the relay container 24 by opening the first relay valve 23A with the second relay valve 25A closed.
In addition, the frozen material stored in the relay container 24 in a state in which communication between the relay container 24 and the frozen material recovery hopper 22 is prevented by opening the second relay valve 25A with the first relay valve 23A closed. Can be supplied to the solvent vaporization vessel 26.

  Further, a processed material discharge path 27 for discharging the pulverized processed material is provided at a lower portion of the solvent vaporization container 26, and a processed material discharge valve 27A for opening and closing the processed material discharge path 27 is provided.

  Further, a vacuum pump 28 that sucks the solvent vaporization vessel 26 is provided, and the solvent vaporization vessel 26 that is sealed by closing the second relay valve 25A and the treatment product discharge valve 27A is sucked by the vacuum pump 28. By acting, it is configured so that a blasting treatment space D in which the solvent rapidly vaporizes can be formed inside the solvent vaporization vessel 26.

  Incidentally, for example, when acetone is used as a solvent for the swelling treatment, since acetone has a vapor pressure of 24.7 kPa at room temperature (20 ° C.), the temperature of the explosion treatment space D is room temperature (20 ° C.). In some cases, the pressure in the explosion treatment space D is adjusted to 24.7 kPa or less.

  For example, when methanol is used as the solvent for the swelling treatment, the methanol has a vapor pressure of 12.7 kPa at room temperature (20 ° C.). 20 ° C), the pressure in the explosion treatment space D is adjusted to 12.7 kPa or less.

  Therefore, in the state where the vacuum pump 28 is operated with the second relay valve 25A and the processed product discharge valve 27A closed, and the explosion treatment space D is formed inside the solvent vaporization container 26, the freezing stored in the relay container 24 is stored. The raw material is configured to explode the raw material by vaporizing the solvent inside the frozen raw material by opening the second relay valve 25A with the first relay valve 23A closed and supplying the raw material to the blasting treatment space D. ing.

That is, the frozen raw material is supplied to the blasting treatment space D so that the frozen solvent inside the frozen raw material becomes vaporizable, and the raw material is exploded by rapid vaporization. .
When the second relay valve 25A is opened, the internal air of the relay container 24 flows into the solvent vaporization container 26, so that the pressure in the blasting treatment space D slightly increases. Therefore, the second relay valve 25A The pressure in the blasting treatment space D before opening is adjusted to be low in anticipation of the increase.

  And it is comprised so that the pulverized processed material inside the solvent vaporization container 26 can be taken out from the solvent vaporization container 26 by opening the processed material discharge valve 27A.

(Summary of the first embodiment)
The synthetic resin pulverization apparatus of the present embodiment first immerses the raw material in a solvent for swelling treatment to swell, thereby allowing the solvent to enter between the molecular chains of the synthetic resin and loosening the bonds between the molecular chains. By cooling the swollen raw material and freezing the internal raw material, the solvent that has entered between the molecular chains of the synthetic resin is frozen and the volume is expanded, so that minute cracks are formed inside the raw material. To generate.

  And since the raw material in which the internal solvent was frozen, that is, the raw material in which minute cracks occurred was pulverized, the powdery raw material of the synthetic resin can be efficiently pulverized.

  In addition, the swollen raw material is cooled by using the cold heat of liquid nitrogen as a liquefied inert gas to freeze the internal solvent, so the swollen raw material is properly frozen while properly cooling the internal solvent. Can be made.

  Furthermore, since the frozen raw material is supplied to the explosion treatment space D in which the solvent is rapidly vaporized and the solvent inside the raw material is rapidly vaporized, the raw material is exploded. Therefore, the raw material is pulverized all at once. Thus, the raw material pulverization efficiency can be further improved.

[Second Embodiment]
Next, a second embodiment will be described. This second embodiment shows another embodiment of the freezing processing unit B, and the other configuration is the same as that of the first embodiment. Only parts different from the embodiment will be described, and the same configurations as those of the first embodiment will be denoted by the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted.

That is, as shown in FIG. 2, in the second embodiment, a container 30 with a cooling jacket is provided in place of the freezing container 11 of the first embodiment.
The swollen raw material supply path 12 is connected to the upper part of the cooling jacketed container 30, and the swollen raw material recovered by the swollen raw material recovery hopper 10 is supplied to the cooling jacketed container 30 through the swollen raw material supply path 12. It is configured to be.

A cooling jacket J is provided on the peripheral portion of the container 30 with a cooling jacket, and liquid nitrogen is supplied to the cooling jacket J through the nitrogen supply path 16. A raw material stirring blade 31 for stirring the raw material is provided.
Further, a discharge cylinder portion 32 for discharging the nitrogen gas vaporized inside the cooling jacket J to the outside is provided on the upper portion of the cooling jacket J.

  Accordingly, the swollen raw material charged into the cooling jacketed container 30 is indirectly cooled by the cooling jacket J to which liquid nitrogen is supplied through the nitrogen supply passage 16, and the charged swollen raw material is stirred by the raw material stirring blade 31. By doing so, the charged swelling raw material is cooled, and the solvent inside the raw material is frozen.

  A raw material discharge passage 33 extending downward from the lower part of the cooling jacketed container 30 is provided in a form connected to the solvent vaporization container 26 of the pulverization processing section C. The raw material discharge path 33 is provided with the cooling jacketed container 30. A material discharge valve 33A for intermittently discharging the frozen material inside is provided.

  Therefore, the vacuum pump 28 is operated with the raw material discharge valve 33A and the processed product discharge valve 27A closed to form the explosion treatment space D inside the solvent vaporization container 26, and the inside of the container 30 with the cooling jacket is formed. The frozen raw material is configured to explode the raw material by evaporating the solvent inside the frozen raw material by opening the raw material discharge valve 33A with the swollen raw material supply valve 13 closed and supplying the frozen raw material to the explosion treatment space D. ing.

  And it is comprised so that the pulverized processed material inside the solvent vaporization container 26 can be taken out from the solvent vaporization container 26 by opening the processed material discharge valve 27A.

(Summary of the second embodiment)
Since the synthetic resin pulverization apparatus of the present embodiment has the same configuration as the synthetic resin pulverization apparatus of the first embodiment, the same function as the synthetic resin pulverization apparatus of the first embodiment is achieved. Will play.

  In the pulverization apparatus for synthetic resin according to the present embodiment, the freezing treatment unit B indirectly cools the swollen raw material with liquid nitrogen by the cooling jacketed container 30 to freeze the solvent inside the raw material. Therefore, since it is not necessary to remove liquid nitrogen from the frozen raw material, the overall configuration can be simplified.

[Third Embodiment]
Next, a third embodiment will be described. This third embodiment shows another embodiment of the pulverization processing unit C, and the other configuration is the same as that of the first embodiment. Only parts different from the embodiment will be described, and the same configurations as those of the first embodiment will be denoted by the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted.

  That is, as shown in FIG. 3, the pulverization processing unit C introduces a frozen raw material and liquid nitrogen supplied from the freezing processing container 11 of the freezing processing unit B into the pulverizing unit 35, and the pulverizing unit 35. There is provided a vaporization processing container 36 for introducing the pulverized processed product discharged from the container.

The pulverizer 35 includes a receiving part 35a for introducing the frozen raw material and liquid nitrogen, a pulverizing part 35b for pulverizing the introduced frozen raw material, and a discharge part 35c for discharging the pulverized processed material.
The pulverization unit 35b classifies the pulverization chamber equipped with the rotator for pulverization, and the pulverized product supplied from the pulverization chamber, and discharges the pulverized processed product pulverized to the target particle diameter from the discharge unit 35c. The classification part is configured to return the pulverized material larger than the target particle size to the pulverization chamber.

  The pulverizer 35 of the present embodiment equipped with the pulverization unit 35b having the pulverization chamber and the classification unit is called a linlex mill, and its configuration is well known. In the present embodiment, the details of the pulverizer 35 are described. The detailed explanation is omitted.

  The vaporization processing container 36 is provided with a hopper-shaped inlet portion 36a for introducing the pulverized processed product supplied from the pulverizer 35 at the upper portion, and the pulverized product discharge path 36b for discharging the pulverized processed product after the solvent is evaporated. Is provided in the lower portion, and the pulverized product discharge passage 36b is provided with a pulverized product discharge valve 37 for intermittently discharging the pulverized processed product after the solvent is vaporized.

A heating heater 38 for heating the internal temperature to the solvent vaporizing temperature is provided inside the vaporization processing container 36, and a vaporization processing space E for vaporizing the solvent is formed inside the vaporization processing container 36. ing.
Incidentally, for example, when acetone is used as the solvent for the swelling treatment, since the boiling point of acetone is about 57 ° C., it is preferable to heat the internal temperature of the vaporization treatment vessel 36 to 57 ° C. or higher.

Therefore, the pulverized processed product supplied from the pulverizer 35 is heated inside the vaporization processing container 36 to vaporize the solvent contained in the pulverized processed product.
In this embodiment, the vaporized solvent (vapor) is discharged to the outside through the inlet portion 36a.

  When the solvent vaporization process for vaporizing the solvent contained in the pulverized processed product is completed, the pulverized product discharge valve 37 is opened, and the pulverized processed product after the solvent is evaporated is taken out from the vaporization processing container 36. become.

(Summary of the third embodiment)
Since the synthetic resin pulverization apparatus of the present embodiment has the same configuration as the synthetic resin pulverization apparatus of the first embodiment, the same function as the synthetic resin pulverization apparatus of the first embodiment is achieved. Will play.

  In the pulverization apparatus for synthetic resin of this embodiment, the pulverization processing unit C pulverizes the raw material in which the internal solvent is frozen by the pulverizer 35, and then vaporizes the pulverized processed product to vaporize the solvent. It supplies to the processing space E, the solvent contained in the pulverized processed material is vaporized, and the pulverized processed material in a dry state is obtained.

  That is, when the raw material in which the internal solvent is frozen is pulverized by the pulverizer 35, the pulverized processed product contains the solvent, but the solvent is vaporized to obtain a pulverized processed product in a dry state. It will be.

[Another embodiment]
Next, another embodiment is listed.
(1) In the first to third embodiments, the case where liquid nitrogen is used as the liquefied inert gas is exemplified. However, for example, other liquefied inert gases such as liquid helium, liquid argon, and liquid carbon dioxide are used. It may be used.

(2) In the third embodiment, as the pulverizer 35 provided in the pulverization processing unit C, a pulverizer having a classification unit in addition to the pulverization chamber is exemplified, but a pulverizer having only the pulverization chamber is equipped. You may implement with a form.
In this case, a classification device for classifying the processed material discharged from the pulverizer 35 is separately provided.

  The configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in the other embodiment, as long as no contradiction occurs. The embodiment disclosed in this specification is an exemplification, and the embodiment of the present invention is not limited to this. The embodiment can be appropriately modified without departing from the object of the present invention.

A Swelling processing part B Freezing processing part C Grinding processing part

Claims (8)

A method for pulverizing synthetic resin by pulverizing and pulverizing powdery raw material of synthetic resin,
A synthetic resin characterized in that the raw material is immersed in a solvent for swelling treatment to swell, the swollen raw material is cooled to freeze the internal solvent, and the internal raw material is crushed. For pulverization.   The method according to claim 1, wherein the swollen raw material is cooled with a liquefied inert gas.   The raw material frozen in the solvent inside is supplied to a blasting treatment space where the solvent is rapidly vaporized, and the raw material is blasted by vaporization of the solvent inside the raw material. 2. A method for pulverizing synthetic resin according to 2.   The raw material in which the solvent inside is frozen is pulverized by a pulverizer, the pulverized processed product is supplied to a vaporization processing space for vaporizing the solvent, and the solvent contained in the pulverized processed product is supplied. The method for pulverizing a synthetic resin according to claim 1 or 2, wherein the method is vaporized. A pulverizing apparatus for synthetic resin that pulverizes and pulverizes a powdery raw material of synthetic resin,
A swelling treatment part that swells the raw material by immersing it in a solvent for swelling treatment, a freezing treatment part that cools the raw material swollen in the swelling treatment part and freezes the solvent inside, and the freezing treatment part And a pulverizing unit for pulverizing the raw material in which the solvent in the interior is frozen.   The pulverization apparatus for synthetic resin according to claim 5, wherein the freezing section is configured to cool the swollen raw material with a liquefied inert gas.   The pulverization processing unit is configured to supply the raw material in which the solvent inside is frozen to an explosion treatment space where the solvent is rapidly vaporized, and to explode the raw material by vaporization of the solvent inside the raw material. The pulverization apparatus for synthetic resins according to claim 5 or 6.   The pulverization processing unit pulverizes the raw material in which the solvent is frozen in a pulverizer, supplies the pulverized processed material to a vaporization processing space for vaporizing the solvent, and is included in the pulverized processed material. The pulverization apparatus for synthetic resins according to claim 5 or 6, wherein the apparatus is configured to vaporize the solvent.

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