JP3817169B2 - Thermocrystallization apparatus for thermoplastic polymer chips - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat crystallization apparatus that heats and crystallizes a thermoplastic polymer chip such as polyamide or polyester, and more particularly to a heat crystallization apparatus that preheats or heats a polyester chip to perform precrystallization.
[0002]
[Prior art]
In the first place, when a thermoplastic polymer chip such as polyamide or polyester having a non-crystallized surface formed by cutting or the like after melt polymerization is dried or solid-phase polymerized, the temperature is usually 90 ° C to 130 ° C or higher. When applied, fusion occurs between the chips. This fusion may be a large lump such as a wrinkle from a lump of 2 to 3 chips. In any case, troubles are caused in subsequent steps, which is not preferable.
[0003]
In the past, in order to eliminate such a fusion phenomenon, the present inventor has proposed a heated crystallization apparatus with a stirring blade (Registered Utility Model Publication No. 3050004) having a conical screen separator in the bottom. This heat crystallization apparatus is effective in preventing fusion between chips, and has been widely used.
[0004]
However, this heat crystallization apparatus also has the following problems.
(1) The processing surface of the screen separator is inclined and clogging is likely to occur.
(2) Maintenance of the clogged screen separator required a large disassembly work and was difficult.
(3) Since the heat shortage gradually proceeds as clogging (solidification) proceeds, it was necessary to gradually increase the treatment time accordingly.
(4) As described in (3) above, since the shortage of heat proceeds gradually, it is difficult to grasp the time of occurrence of crystallization failure, and unexpected troubles are likely to occur.
(5) Since unexpected troubles are likely to occur as described in (4) above, it is not necessarily suitable for continuous use other than the batch method.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to newly provide a heat crystallization apparatus for a thermoplastic polymer chip which has been devised to solve the above problems.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the thermoplastic polymer chip heating and crystallization apparatus according to the present invention has a pre-crystallization pellet inlet at the top of a cylindrical tank and a crystallized pellet outlet at the bottom. A thermoplastic polymer chip crystallization apparatus having a plurality of stirring blade groups in the vertical direction inside, and having a partition wall made of a metal plate having a funnel shape in the bottom of the tank. A space surrounding the partition wall is formed between the bottom wall and the partition wall of the tank, and a hot air supply device for supplying hot air into the space is connected to the tank and the exhaust is disposed deep in the partition wall. A delivery pipe for delivering the crystallized pellets to the outlet is connected, and a bottom side mesh portion having many small holes for communicating the inside of the pipe with the space is provided on the wall of the delivery pipe . upward, cylindrical body wall inside the tank An opening for hot air outlet provided, the barrel-side mesh portion having a lot of small holes for communicating state with the mouth and the tank opening surface of the hot air outlet provided, the barrel-side mesh portion inclined In addition, an opening lid for maintaining the trunk side mesh portion is provided outside the trunk side mesh portion.
[0007]
【Example】
In the first embodiment shown in FIGS. 1 and 2, a cylindrical tank 1 with a funnel-shaped bottom 14 whose outer surface is encapsulated by a heat insulating material 13 is constructed, and an inlet 2 for pellets before crystallization is formed on the upper portion of the tank 1. And a hot air discharge port 17, a crystallized pellet discharge port 3 at the lower end of the funnel-shaped bottom 14, and a funnel shape slightly shallower than the bottom 14 inside the funnel-shaped bottom 14 of the tank 1. In order to insert a partition wall 5 made of a plate to form a space 7 surrounding the partition wall 5 between the funnel-shaped bottom 14 and the partition wall 5, and to supply hot air to the space 7 in the space 7 The hot air supply port 6 is opened and a hot air supply device (not shown) is connected to the same.
[0008]
Further, in the first embodiment, a delivery pipe 8 for sending the crystallized pellets to the discharge port 3 is connected to the deep part of the partition wall 5, and the inside of the pipe 8 and the space 7 are connected to the wall of the delivery pipe 8. Three vertical hot air outlets 10a that are provided on the inner side of the cylindrical body wall of the tank 1 are provided on the inside of the cylindrical body wall of the tank 1 while providing the bottom side mesh portion 9 having many small holes for communication. Are provided at equal intervals, and the body side mesh portion 11a having a large number of small holes for communicating the inside of the same port 10a and the inside of the tank 1 is provided on the opening surface of each hot air outlet 10a. is there.
[0009]
In the first embodiment, an opening lid 18 is provided on the outside of the body side mesh part 11a for maintenance of the body side mesh part 11a. Since it did in this way, maintenance, such as eliminating the clogging of the trunk side mesh portion 11a, can be easily performed from the outside of the tank 1 with the opening lid 18 removed, which is convenient.
[0010]
Further, in the first embodiment, the rotary shaft 15 rotated by a stirring motor (not shown) is centered on the top wall of the tank 1 so that the lower end thereof reaches the vicinity of the bottom port 16 of the partition wall 5. The rotating shaft 15 is provided with a plurality of stirring blades 4 for stirring while returning the crystallization pellets (hereinafter simply referred to as crystallization pellets) in the tank 1 and the partition wall 5 to the upper side. It is.
[0011]
In the second embodiment shown in FIGS. 3 and 4, the upper edge of the space 7 is extended upward and is connected to a cylindrical extension 19. A ring-shaped hot air outlet 10b is provided at the opening, and a trunk-side mesh portion 11b having a large number of small holes on the opening surface of the ring-shaped hot air outlet 10b for connecting the inside of the mouth 10b and the tank 1 to each other. Is provided. Since the other parts have the same configuration as that of the first embodiment, the same parts are denoted by the same reference numerals and detailed description thereof is omitted.
[0012]
In the above embodiment, an inspection window 20 for the inside of the space 7 and the bottom mesh portion 9 is provided in the funnel-shaped bottom 14, and although not shown in the figure, a shutter is provided at the discharge port 2, and the tank 1. An internal inspection lid, a pellet amount gauge window, and the like are provided on the cylindrical body wall.
[0013]
In the above-described embodiment, first, hot air is supplied from the hot air supply port 6 to warm the whole and the stirring blade 4 is rotated, and then, for example, a pre-crystallization pellet of polyethylene terephthalate and a coloring master through the input port 2. The batch and calcium stearate etc. are charged up to each amount, and the temperature is adjusted with the control panel (not shown) of the hot air supply device, and a stable temperature state is continued based on the data obtained in advance for a certain period of time for crystallization. When the completion of crystallization of the previous pellets is confirmed through the pellet gauge window, the crystallized pellets mixed with the coloring master batch are supplied to the molding machine (not shown) or the like from the discharge port 3 or packed in a bag. The pellet crystallization treatment can be performed either batchwise or continuously.
[0014]
When used in the above-mentioned usage etc., the hot air supplied from the hot air supply port 6 enters the tank 1 through the hot air outlets 10a and 10b and the body side mesh portions 11a and 11b and crystallizes the pellets in the tank 1 And the function of entering the partition wall 5 through the bottom mesh portions 10a and 10b and heating the partition wall 5 in the space 7 to crystallize the pellets present in the partition wall 5.
[0015]
In the case of performing the above function, the partition wall 5 has no eyes (small holes), so there is no risk of causing problems due to clogging as in the conventional screen separator, and the body side mesh portion 11a. 11b are provided on the cylindrical body wall of the tank 1 so as not to be inclined, so that clogging is unlikely to occur.
[0016]
【The invention's effect】
Therefore, according to the present invention, it is possible to provide a heat crystallization apparatus that can sufficiently avoid various problems such as those caused in the conventional example employing the screen separator and can always supply a constant and stable chip. In addition, since clogging is unlikely to occur, the number of tank cleanings that must be carried out after stopping the operation of the tank can be remarkably reduced, which is extremely effective in improving work efficiency and ensuring safety. Can be obtained. In addition, maintenance can be easily performed by opening the opening lid, which is convenient and convenient to use.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a first embodiment of the present invention.
FIG. 2 is also a plan sectional view.
FIG. 3 is a front sectional view showing a second embodiment of the present invention.
FIG. 4 is a plan sectional view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tank 2 Inlet 3 Outlet 4 Stirring blade 5 Partition wall 6 Hot air supply port 7 Space 8 Delivery pipe 9 Bottom side mesh part 10a, 10b Hot air outlet 11a, 11b Trunk side mesh part 13 Heat insulating material 14 Funnel-shaped bottom 15 Rotating shaft 16 Bottom port 17 Hot air outlet 18 Opening lid 19 Extension part 20 Inspection window

Claims (2)

A thermoplastic polymer chip having an inlet for pellets before crystallization at the top of a cylindrical tank, an outlet for discharging crystallized pellets at the bottom, and a multistage stirring blade group in the vertical direction inside It is a heat crystallization device, and a space surrounding the partition wall is formed between the bottom wall and the partition wall of the tank by inserting a partition wall made of a metal plate having a funnel shape in the bottom of the tank, A hot air supply device for supplying hot air into the space is connected to the tank, and a delivery pipe for sending the crystallized pellets to the discharge port is connected to the deep part of the partition wall, and the inside of the pipe is connected to the wall of the delivery pipe. And a bottom side mesh portion having many small holes for communicating with the space, and a hot air outlet opening to the inside of the cylindrical body wall of the tank is provided above the partition wall. The inside of the outlet and the tank communicate with the opening surface of the outlet And the body portion-side mesh portion having a lot of small holes for providing the heating crystallization apparatus of the thermoplastic polymer chips the barrel side mesh portion is characterized in that it is formed so as not to tilt.   The thermoplastic polymer crystallization apparatus for a thermoplastic polymer chip according to claim 1, wherein an opening lid for maintaining the trunk side mesh portion is provided outside the trunk side mesh portion. Combined chip heat crystallization equipment.

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