JP3721057B2 - Polyethylene terephthalate crystallizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyethylene terephthalate crystallization apparatus for making pellets before crystallization of polyethylene terephthalate into pellets that have been crystallized so that they can be used for injection molding, blow molding and the like.
[0002]
[Prior art]
When molding is performed with a molding machine using polyethylene terephthalate, it is necessary to obtain a molded product using pellets in a crystallized state.
[0003]
Since most of such recycled pellets are in an uncrystallized state as described above, they are used for injection molding and blow molding after being recrystallized. In such use, for example, they are solidified in a hopper dryer. In many cases, it has become necessary to recrystallize and use before using them for molding.
[0004]
However, since this recrystallization is technically difficult, it has been conventionally provided by large-scale processing using a large apparatus in a large factory. For this reason, a molding company who uses only a small amount of recycled pellets has no choice but to purchase at a high price and perform molding, or give up buying and do not perform molding.
[0005]
Therefore, the present inventor considered that even a molding plant that is scheduled to use only a small amount can be easily recrystallized in-house (of course, crystallization of virgin pellets), and devised a prototype of the present invention, Furthermore, improvements in performance and reliability, an increase in the amount of crystallization treatment, a reduction in crystallization treatment time, and a reduction in crystallization treatment cost were repeated, and a polyethylene terephthalate crystallization apparatus according to the present invention could be provided. It is a thing.
[0006]
[Problems to be solved by the invention]
It is an object of the present invention to provide a novel polyethylene terephthalate crystallization apparatus capable of improving performance and reliability, increasing the amount of crystallization treatment, shortening the crystallization treatment time, reducing the crystallization treatment cost, and the like. To do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the polyethylene terephthalate crystallization apparatus according to the present invention is a polyethylene terephthalate crystallization for making pellets before crystallization of polyethylene terephthalate into crystallized pellets so that they can be used for molding such as injection molding and blow molding. A device having a tank having a pellet inlet before crystallization, a conical screen separator provided in the bottom of the tank, a space formed below the screen separator, and a crystal connected deep in the screen separator. A delivery port for discharging the pelletized pellets out of the tank, a plurality of stirring blades for stirring the crystallization pellets existing in the tank back upward, and supplying hot air into the tank from the side of the tank. Hot air inlet, hot air supply device connected to the hot air inlet, and hot air outlet Are those with baffle and plates for changing the direction of so that hot air into pellets in phosphate separator does not hit directly, and a discharge port for discharging the obsolete hot air in the tank,
[0008]
And an air volume adjusting plate for adjusting the amount of hot air blown in accordance with the amount of pellets in the tank, and a dust collecting passage that discharges dust that has fallen through the screen separator by natural fall from the bottom of the tank. It is provided as appropriate.
[0009]
【Example】
The first embodiment shown in FIGS. 1 to 4 comprises a spherical bottom cylindrical batch tank 2 whose entire outer peripheral surface is encapsulated with a heat insulating material 1, and a coloring pellet is formed on the top wall of the batch tank 2. An inlet 3 for a masterbatch, an additive for preventing coagulation such as calcium stearate and a pellet before crystallization of polyethylene terephthalate is provided, and a conical screen slightly shallower than the bottom 4 inside the spherical bottom 4 of the batch tank 2. A separator 5 is provided to form a space 6 between the spherical bottom 4 and the screen separator 5, and a discharge tube 8 with a shutter 7 for opening and closing crystallized pellets mixed with a master batch for coloring at the lower end of the screen separator 5. Are connected to each other, and the colored master batch mixed crystallized pellets (hereinafter simply referred to as crystallized pellets) are connected from the discharge port pipe 8. Is supplied to a molding machine (not shown), and a rotary shaft 10 that is rotated by a stirring motor (not shown) in the center of the top wall of the batch tank 2 has a lower end at the bottom opening 11 of the screen separator 5. As a position that reaches near, a coloring master batch mixed crystallization pellet (hereinafter simply referred to as crystallization pellet) existing in the batch tank 2 and the screen separator 5 is returned to the rotating shaft 10 and returned upward. A control panel for attaching a large number of stirring blades 12 for stirring, and heating the outside air sucked by the blower 14 near the batch tank 2 by bringing it into contact with the built-in heater 15 to supply hot air from the side of the tank The hot air supply device 17 with 16 is provided, and the hot air inlet 18 of the hot air supply device 17 is opened in the outer wall of the space 6 and the hot air A baffle 22 for changing the direction to prevent hot air from directly hitting the pellet during crystallization in the screen separator 5 is provided at the mouth, and a used hot air exhaust port 19 for hot air on the top wall of the batch tank 2. (It can also be provided with a filter.) And further adjusts the amount of hot air blown into the outside air inlet of the blower 14 in the hot air supply device 17 according to the amount of pellets in the batch tank 2. A batch-type polyethylene terephthalate crystallization apparatus is configured by providing an air volume adjusting plate 23 and providing a dust collecting passage 24 for discharging dust that has fallen through the screen separator 5 by natural fall to the bottom of the batch tank 2. Is.
[0010]
In the first embodiment, first, the blower 14 is rotated and the internal heater 15 is energized at the same time to warm the whole and the stirring blade 12 is rotated. The master batch for ring and calcium stearate are charged up to each fixed amount, and the temperature is adjusted by the control panel 16 of the hot air supply device 17, and the temperature is kept stable until a certain time based on the data. When the completion of crystallization is confirmed through the pellet gauge window 33, supply of hot air and stirring are stopped, and after the stop, the shutter 7 is opened and the crystallized pellets mixed with the mastering batch for coloring are directly or packaged from the outlet pipe 8. Thus, it is used in such a manner that it is supplied from the bag to the molding machine after stock.
[0011]
In the figure, reference numeral 31 is an inspection lid, 32 is a dust outlet, and 33 is a pellet gauge window.
[0012]
The second embodiment shown in FIG. 5 comprises a spherical bottom cylindrical batch tank 2 whose entire outer peripheral surface is encapsulated by a heat insulating material 1, and a pelletized master batch for coloring is formed on the top wall of the batch tank 2. Provided with an inlet 3 for mixing pellets of calcium stearate and other anti-coagulant additives and polyethylene terephthalate uncrystallized pellets (in the text, simply referred to as pellets before crystallization) and inside the spherical bottom 4 of the batch tank 2 A conical screen separator 5 that is slightly shallower than the bottom 4 is provided to form a space 6 between the spherical bottom 4 and the screen separator 5, and at the lower end of the screen separator 5, a master batch for coloring is mixed and crystallized. A discharge pipe 8 with a shutter 7 for opening and closing pellets (simply referred to as “crystallized pellet” in the text) is connected. Crystallized pellets are supplied to a molding machine (not shown), and a rotating shaft 10 that is rotated by a stirring motor (not shown) at the center of the top wall of the batch tank 2 has a lower end of a screen separator 5. Pelletizing crystallization pellets in the upper half of the batch tank 2 around the upper half of the rotating shaft 10 and crystallization pellets (in the text, only the first crystal) A plurality of longitudinal stirring blades 13a for stirring while returning the pellet to the upper side are attached, and in the lower half of the batch tank 2 and in the screen separator 5 around the lower half of the rotary shaft 10. Mixing crystallization pellets such as existing mastering batches (in the main text, simply referred to as late crystallization pellets) A hot air supply device with a control panel 16 for attaching a counter stirrer blade 13b and heating the external air sucked by the blower 14 to the side of the batch tank 2 by bringing it into contact with the built-in heater 15 to supply hot air from the side of the tank. 17 is provided, and the hot air inlet 18 of the hot air supply device 17 is opened in the outer wall of the space 6 so that the hot air does not directly hit the pellets during crystallization in the screen separator 5 at the hot air inlet. A baffle plate 22 for changing the direction of the air is provided, and a hot air exhaust port 19 (which may be provided with a filter) for hot air is provided on the top wall of the batch tank 2. The blower 14 is equipped with an air volume adjusting plate 23 for adjusting the amount of hot air blown in accordance with the amount of pellets in the batch tank 2 at the outside air suction port, A batch type polyethylene terephthalate crystallization apparatus is configured by providing a dust collecting passage 24 for discharging dust that has fallen through the screen separator 5 to the outside of the tank 2 by natural fall.
[0013]
In the second embodiment, first, the blower 14 is rotated and the internal heater 15 is energized at the same time to warm the whole and the stirring blades 13a and 13b are rotated. The temperature was adjusted by the control panel 16 of the hot air supply device 17 and the temperature stabilized state was continued for a certain time based on the data, and the completion of crystallization of the pellet before crystallization was confirmed by the pellet gauge window 33. At that time, supply of hot air and agitation are stopped, and after stopping, the shutter 7 is opened, and the crystallized pellets mixed with the mastering batch for coloring are packed directly from the outlet pipe 8 or packed, and supplied from the bag to the molding machine after stocking. It is used in usages such as.
[0014]
When the shutter 7 is opened and the crystallized pellets are taken out in the usage of the first and second embodiments, if the whole pellets are not taken out and are left slightly toward the bottom of the screen separator 5, they are prevented from solidification for the next use. In addition, it can be used without adding a pelletized master batch for coloring.
[0015]
The third embodiment shown in FIG. 6 comprises a spherical bottom type cylindrical tank 2 whose entire outer peripheral surface is encapsulated with a heat insulating material 1, and a pelletized master batch for coloring and calcium stearate on the top wall of the tank 2. An inlet 3 for a mixed pellet (in the text, simply referred to as a pre-crystallization pellet) of an additive for preventing coagulation and an uncrystallized polyethylene terephthalate pellet is provided, and the same bottom 4 is provided inside the spherical bottom 4 of the tank 2. A slightly shallower conical screen separator 5 is provided to form a space 6 between the spherical bottom 4 and the screen separator 5, and a crystallized pellet mixed with a master batch for coloring at the lower end of the screen separator 5 (text) In the middle, simply referred to as a crystallized pellet), a downstream pipe 8 is connected, and the crystallized pellet is supplied from the downstream pipe 8 to a molding machine (not shown). In addition, the rotating shaft 10 rotated by a stirring motor (not shown) is passed through the center of the top wall of the tank 2 as a position where the lower end reaches the vicinity of the bottom port 11 of the screen separator 5. Mixing crystallization pellets such as coloring masterbatch existing in the upper half of the tank 2 around the upper half of the 10 crystallization pellets (in the text, simply referred to as the previous crystallization pellets) And a mixing master batch such as a coloring master batch existing in the lower half of the tank 2 and in the screen separator 5 around the lower half of the rotary shaft 10 (in the text, A plurality of lateral stirring blades 13b for stirring without returning upward), and a blower beside the tank 2 4, a hot air supply device 17 with a control panel 16 for supplying hot air by heating the outside air sucked in through contact with the built-in heater 15 is provided, and heat for supplying the hot air from the hot air supply device 17 from the side of the tank. A baffle 22 for changing the direction is provided to open the air blowing port 18 in the outer wall of the space 6 and to prevent the hot air from directly hitting the pellet during crystallization in the screen separator 5 at the hot air blowing port location, Further, a hot air used hot air exhaust port 19 (which may be provided with a filter) is provided on the top wall of the batch tank 2, and the inside of the batch tank 2 is connected to the outside air suction port of the blower 14 in the hot air supply device 17. Equipped with an air volume adjusting plate 23 for adjusting the amount of hot air blown in accordance with the amount of pellets, and the powder dropped on the bottom of the batch tank 2 via the screen separator 5 A continuous polyethylene terephthalate crystallization device 25 is configured by providing a dust collecting path 24 for discharging dust by natural fall outside, and the continuous polyethylene terephthalate crystallization device 25 is arranged above the injection molding machine body 26. The crystallized pellet flow-down pipe 8 of the crystallization device 25 is directly connected to the pellet receiving port 27 of the injection molding machine body 26 in a mounted state to form a molding machine 28.
[0016]
In the third embodiment, first, the prepared crystallized pellets are filled up to the bottom of the lateral stirring blade 13b in the tank 2, and the molding by the molding machine body 26 is started using this. The built-in heater 15 is energized and the blower 14 and the stirring blades 13a and 13b are rotated to warm the entire tank 2 while filling the pre-crystallization pellets from the charging port 3, and the hot air supply device 17 is filled in this state. The control panel 16 adjusts the temperature to continue the stable temperature state based on the data, so that the pellet before crystallization is crystallized and the crystallized pellet is stably supplied continuously. The pellet gauge window 33 confirms that it has become possible to obtain crystallized pellets in succession at the start in this way, and the pre-filled crystallized pellets. It followed Tsu preparative continuously feeding to a forming machine body 26 from falling port tube 8, thus those subjected to usage, such as obtaining a molded article in a continuous operation.
[0017]
The present invention can be implemented with various modifications without departing from the spirit of the present invention as follows, for example, and the present invention extends to those modified and implemented. .
The hopper dryer (dehumidifier) is not connected directly to the pellet receiving port 27 of the injection molding machine main body 26 as in the above-described embodiment, except for the connection of the crystallized pellet flow-down port 8 of the continuous polyethylene terephthalate crystallization apparatus 25 to the pellet receiving port 27 Through the dryer).
-The rotation shaft is a biaxial structure, and the rotational speed of the vertical stirring blades and the rotational speed of the horizontal stirring blades are controlled separately.
・ An open / close shutter 29 for forcibly and temporarily stopping the discharge of the crystallized pellets is provided at the location of the downstream outlet pipe, for example, prepared in advance up to the bottom of the lateral stirring blade 13 in the tank 2. It can be used to secure a state in which the crystallized pellets are filled, or the supply of the crystallized pellets can be stopped before the molding operation is finished to empty the molding machine main body.
In the case of the above continuous type, the amount of pellets in the tank 2 is detected by a level meter and others, and the input amount of pellets to the tank is controlled appropriately by this detection data.
In the above examples, the pre-crystallization pellets, the early crystallization pellets, the late crystallization pellets, and the crystallized pellets are mixed with pelletizing masterbatch for coloring, anti-coagulant additives such as calcium stearate. However, it does not mix and mixes other things appropriately.
-The direction of the baffle plate 22 for changing the direction can be arbitrarily changed.
・ The hot air in / out method should be implemented in an appropriate configuration such as putting in the tank from the top and taking it out from the bottom.
・ Collect dust from the dust collection path in water or in a dust collector.
・ Attach an open / close shutter to the dust collection path.
[0018]
【The invention's effect】
Since the polyethylene terephthalate crystallization apparatus according to the present invention is as described above, hot blast is sent in a state in which polyethylene terephthalate pre-crystallization pellets (regenerated pellets), a coloring masterbatch, and calcium stearate are charged up to each amount. During agitation, the entire pellet in the tank is crystallized instantly without causing a situation where it hardens due to the hardened crystallized state. A new polyethylene terephthalate crystallizer with significantly improved performance and reliability, increased crystallization processing amount, shortened crystallization processing time, reduced crystallization processing cost, etc. Of course, the polyester according to claim 1 is particularly effective. Since the terephthalate crystallization apparatus is provided with a baffle 22 for changing the direction so that hot air does not directly hit the pellets in the screen separator at the hot air inlets provided on the side wall of the tank. The polyethylene terephthalate crystallizing apparatus according to claim 2 has an advantage that it directly hits a part of the pellets near the hot air inlet and causes partial solidification to form a lump by so-called sticking to the screen separator. Since the air volume adjusting plate 23 for adjusting the amount of hot air blown in accordance with the amount of pellets in the tank is provided at an appropriate place, the condition should be changed to a good condition according to the amount of pellets in the tank. When the amount of pellets in the tank is small, excessively strong wind is applied to discharge the pellets out of the screen separator. The polyethylene terephthalate crystallization apparatus according to claim 3 is a dust collection device that discharges dust that has fallen through the screen separator by natural fall from the bottom of the tank. Since the road is provided, there are practical effects such as factory hygiene and other very convenient.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.
FIG. 2 is a sectional view taken along line 1A-A in FIG.
3 is an enlarged plan view of the main part of the same. FIG. 4 is a sectional view taken along the line B-B in FIG.
FIG. 5 is a cross-sectional view showing a second embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat insulating material 2 Tank 3 Input port 4 Spherical bottom 5 Screen separator 6 Space 7 Opening / closing shutter 8 Discharge pipe 10 Rotating shaft 11 Bottom port 12 Stirring blade 13a Vertical stirring blade 13b Horizontal stirring blade 14 Blower 15 Heater 16 Control board 17 Hot air supply device 18 Hot air inlet 19 Exhaust port 22 Baffle plate 23 for changing direction Air volume adjusting plate 24 Dust collection path 25 Continuous polyethylene terephthalate crystallizer 26 Injection molding machine body 27 Pellet receiving 28 Molding machine 29 For opening and closing Shutter 31 Inspection lid 32 Garbage outlet 33 Pellet gauge window

Claims (3)

  A polyethylene terephthalate crystallization device for making pellets before crystallization of polyethylene terephthalate into crystallized pellets so that they can be used for injection molding, blow molding, etc., and a tank having an inlet for pellets before crystallization, and a tank A cone-shaped screen separator provided in the bottom of the screen, a space formed below the screen separator, a delivery port for discharging crystallized pellets connected to a deep portion of the screen separator, and crystals existing in the tank A plurality of stirring blades for stirring the pellets while the pellets are being converted upward, a hot air inlet for supplying hot air into the tank from the side of the tank, a hot air supply device connected to the hot air inlet, For changing direction to prevent hot air from directly hitting pellets in the screen separator at the entrance. And magic plate, polyethylene terephthalate crystallization apparatus is characterized in that and an exhaust port for discharging the obsolete hot air in the tank.   2. The polyethylene terephthalate crystallization apparatus according to claim 1, further comprising an air volume adjusting plate for adjusting the amount of hot air blown in accordance with the amount of pellets in the tank.   3. A polyethylene terephthalate crystallization apparatus according to claim 1 or 2, further comprising a dust collecting path for discharging dust that has fallen through a screen separator by natural fall from the bottom of the tank. .

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