JP3993360B2 - Crystalline dryer for granular synthetic resin material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for crystallizing and drying a granular synthetic resin material (so-called “chip”) (hereinafter simply referred to as “drying apparatus”) .
[0002]
[Prior art]
There are various types of drying apparatuses, and in particular, the following drying apparatus (Japanese Patent Laid-Open No. 5-345320) previously invented by the present inventor exists.
[0003]
That is, as shown in FIG. 6, the drying apparatus includes a hopper 110 having a lower conical shape at a lower portion, and a abacus ball-shaped hot air contact member 124 disposed in the hopper, at least at the lower conical shape at the lower portion thereof. And a hot air supply pipe 130 for supplying hot air to the reverse cone-shaped portion 112 of the hopper, and a hot air supply pipe 130 for supplying hot air to the reverse cone-shaped portion 112 of the hopper, A plurality of pipes are provided around the shape part, and each pipe is inclined so as to be lower toward the distal end side, and the extension line of the axial center of each pipe is a peripheral surface of the lower inverted conical part of the member against the hot air And a stirring member including a shaft 120 extending upward from the hot air contact member and a blade 122 extending laterally from the shaft.
[0004]
[Problems to be solved by the invention]
However, today, high-value-added fiber raw material chips called new synthetic fibers are used in the textile industry. However, since the chips have a long crystallization time, the conventional drying apparatus has a narrow temperature range. Since the chip cannot be adjusted and the chip is solidified, the conventional drying apparatus cannot be used for crystallization and drying of the chip.
[0005]
Therefore, the present inventor supplies cold air to the middle of the drying device, makes the lower hopper thinner than the upper hopper, changes the ratio of length to diameter (L / D), and the upper and lower hoppers. We have invented a drying device that can prevent temperature control, energy saving, and solidification of the chip by providing a region where the diameter gradually changes in the middle part.
[0006]
[Means for Solving the Problems]
The drying apparatus according to the present invention includes a first cylindrical portion having a right columnar shape in the upper portion and a coaxially connected lower portion of the first cylindrical portion, and the upper end has the same diameter as the first cylindrical portion. A tapered cylindrical portion whose diameter is gradually narrowed downward, and a right columnar shape in which the diameter is the same as the diameter of the lower end of the tapered cylindrical portion and the lower portion is formed in an inverted conical shape. A hopper composed of a second cylindrical portion of the hopper, and an abacus ball-shaped hot air contact member disposed in the hopper, wherein at least the lower conical portion of the lower half is located inside the reverse conical portion of the lower portion of the hopper A hot air supply pipe for supplying hot air to the inverted conical portion of the hopper, a stirring member comprising a hot air contact member positioned, a shaft extending upward from the hot air contact member, and blades extending laterally from the shaft And a plurality of heat sinks are provided around the inverted conical portion of the hopper. The supply pipes are arranged so as to be inclined downward toward the tip side, and the extension line of the axial center of each hot air supply pipe is positioned so as to reach the peripheral surface of the lower half inverted conical part of the hot air contact member. A hot air supply pipe, a first cold air supply pipe for supplying cold air into a plurality of hoppers provided around a cylindrical part near the boundary between the first cylindrical part and the tapered cylindrical part of the hopper, and a tapered cylinder of the hopper And a second cold air supply pipe for supplying cold air into a plurality of hoppers provided around the cylindrical portion near the boundary between the first cylindrical portion and the second cylindrical portion.
[0007]
By configuring as described above, temperature control, energy saving, and chip solidification can be prevented in the hopper.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 show a drying apparatus according to the present embodiment, FIG. 1 is a schematic front view of the drying apparatus, FIG. 2 is a schematic sectional view of the drying apparatus, and FIG. 3 is a schematic view of the hot air supply apparatus. 4 is a schematic view of a cold air supply device, and FIG. 5 is a block diagram showing a hot air and cold air supply and discharge circuit to the drying device.
[0009]
As shown in FIGS. 1 and 2, the drying device 1 according to the present invention includes a hopper 10, a stirring device 20 that operates in the hopper, a hot air supply device 30 that supplies hot air into the hopper, And it is comprised from the cold wind supply apparatus 40 which supplies cold wind in a hopper.
[0010]
[About Hopper]
As shown in FIGS. 1 and 2, the hopper 10 is configured by connecting a first cylindrical portion 11, a tapered cylindrical portion 12, and a second cylindrical portion 13 coaxially in the vertical direction. The first cylindrical portion 11 is a cylindrical body having the same diameter over its entire length, and has a so-called right columnar shape in which the central axis is perpendicular to the radial direction. Further, the tapered cylindrical portion 12 continuously provided below the first cylindrical portion 11 has the same diameter as that of the first cylindrical portion 11 at the upper end, and gradually decreases in diameter as it goes downward. It has a tapered cylindrical shape. Further, the second cylindrical portion 13 provided continuously below the tapered cylindrical portion 12 is a cylindrical body having a diameter that is the same as the diameter of the lower end of the tapered cylindrical portion 12 over its entire length. The lower end of the second cylindrical portion 13 has a thin tip, and is formed as a funnel-shaped inverted conical portion 14. The upper part of the hopper 10 is provided with a material inlet 15 for introducing the chip A as a raw material and an exhaust pipe 16 for discharging the air inside the hopper, and the lower part is a crystallization chip obtained from the material. A product discharge port 17 for discharging B is formed.
[0011]
[About stirring device]
As shown in FIG. 2, the stirring device 20 includes a rotating shaft 21 that hangs down along the central axis in the hopper 10, blades 22 that extend in the lateral direction of the rotating shaft 21, and a lower end of the rotating shaft 21. And a hot air contact member 23 disposed on the hopper 10, installed above the hopper 10, and driven by a rotation mechanism 24 to which the rotation shaft 21 is attached.
[0012]
The hot air hitting member 23 is formed in an abacus ball shape, that is, a shape in which the upper half conical portion 25 and the lower half conical portion 26 are combined. And the reverse cone-shaped part 26 of the hot air contact member 23 is comprised so that it may be located at least inside the reverse cone-shaped part 14 of the hopper 10.
[0013]
If the gap d between the inverted conical portion 14 at the lower part of the hopper and the hot air contact member 23 is too wide, a swirl flow due to hot air supplied from the hot air supply device 30 described later does not occur. Since it is difficult to be discharged from the discharge port 17, it is necessary to set an appropriate gap from this viewpoint.
[0014]
[About hot air supply device]
As shown in FIG. 3, the hot air supply device 30 includes a hot air supply pipe 31 and a ring pipe 32, and hot air is supplied into the hopper from the hot air supply source 33 outside the hopper through the ring pipe 32 and the hot air supply pipe 31. Is done.
[0015]
The hot air supply pipe 31 is a pipe for supplying hot air to the inverted conical portion of the hopper, and a plurality (six in the present embodiment) are provided around the inverted conical portion 14 of the hopper 10. Each hot air supply pipe 31 is inclined and arranged so as to be positioned lower toward the tip side, and the extension line of the axial center of each hot air supply pipe 31 is the peripheral surface of the inverted conical portion 26 in the lower half of the hot air contact member 23. The tip 31a of each hot air supply pipe 31 is opened inward on the peripheral surface of the hopper inverted conical portion 14.
[0016]
If the inclination angle of the hot air supply pipe 31 described above, that is, the angle of the hot air flow with respect to the vertical axis is set to a steep angle, the hot air swirl tends to occur, the hot air easily flows upward, and the crystallization chip is Stirring by the stirrer 20 is possible even when hot air does not flow because it is difficult to enter the inlet of the hot air supply pipe. However, as described above, the hot air passing through the hot air supply pipe 31 needs to hit the inverted conical portion 26 in the lower half of the member 23 against the hot air. That is, if the hot air reaching point is lowered too much, no swirl flow is generated. From the above two requirements, the angle of the hot air supply pipe 31 must be determined appropriately. As an example, when the inclination angle of the majority of the inverted conical portion 26 of the member against hot air with respect to the vertical axis of the bus is 30 °, the inclination angle of the hot air supply pipe 31 with respect to the bus is preferably 30 °.
[0017]
Moreover, it is preferable that the hot air supply pipe | tube 31 is substantially the same diameter in an axial direction, and the opening shape of the front-end | tip 31a is an inclined elliptical shape. That is, if the tip is made small in diameter, a swirl flow is unlikely to occur and resistance to hot air flow is large. Further, if the tip is cut obliquely, a swirl flow is likely to occur. Moreover, if it does in this way, it will be easy to collide with the member 23 against hot air, without a hot air flow spreading | diffusion. And hot air spread | diffuses by colliding.
[0018]
Furthermore, if the number of hot air supply pipes 31 is too large, hot air does not flow sufficiently in the hot air supply pipe 31 far from the hot air supply source 33, and excessive hot air flows in the hot air supply pipe 31 on the opposite side. Moreover, if there are too few hot-air supply pipe | tubes 31, it will be difficult to produce a uniform swirl flow. In any case, a uniform hot air flow cannot be obtained.
[0019]
The plurality of hot air supply pipes 31 are connected by a ring pipe 32 extending in the circumferential direction. The ring pipe 32 is constituted by a two-divided pipe branched to the left and right. The base end side 32a of the ring pipe 32 is connected to the hot air supply source 33, and the branch end side 32b is interrupted. As described above, the ring tube 32 is configured by a two-divided tube branched right and left. When the ring tube is configured by a single continuous tube, it is difficult to uniformly supply hot air to each hot air supply tube 31. Because.
[0020]
[Cooling air supply device]
As shown in FIG. 1 and FIG. 2, the cold air supply device 40 includes a first cold air supply device 50 and a second cold air supply device 60 that have the same structure, and the first cold air supply device 60. 50 is provided near the boundary between the first cylindrical portion 11 and the tapered cylindrical portion 12 of the hopper 10, and the second cold air supply device 60 is provided near the boundary between the tapered cylindrical portion 12 and the second cylindrical portion 13 of the hopper. It has been.
[0021]
As shown in FIG. 4, the cold air supply devices 50 and 60 are each composed of a first cold air supply pipe 51, a second cold air supply pipe 61, and ring pipes 52 and 62, and the ring from the cold air supply source 43 outside the hopper. Cold air is supplied into the hopper through the pipes 52 and 62 and the hot air supply pipes 51 and 61. The cold air supply pipes 51 and 61 are pipes for supplying cold air into the hopper 10, and a plurality (six in this embodiment) of the cold air supply pipes 51 and 61 are provided around the hopper 10. Are arranged horizontally with respect to the upright hopper 10.
[0022]
These cold air supply pipes 51 and 61 are connected by ring pipes 52 and 62 extending in the circumferential direction. The ring pipes 52 and 62 are constituted by two divided pipes branched left and right. The base end side 52a and 62a of the ring pipes 52 and 62 are connected to the cold air supply source 43, and the branch end side 52b and 62b. Is interrupted. As described above, the ring pipes 52 and 62 are constituted by two divided pipes branched right and left. When the ring pipe is constituted by one continuous pipe, the cold air is uniformly supplied to the cold air supply pipes 52 and 62. It is because it is hard to be supplied to.
[0023]
In the drying device 1 configured as described above, the second cylindrical portion 13 provided with the hot air supply device 30 is a region where the supplied hot air rises as a swirling flow, and forms a drying zone. Further, the tapered cylindrical portion 12 sandwiched between the first cold air supply device and the second cold air supply device at the upper part thereof is hot air rising from the second cylindrical portion 13 and cold air supplied from the first cold air supply device 60. And a crystallization zone.
[0024]
Next, the supply of hot air and cold air in the present drying apparatus 1 and the granular synthetic resin material using the present drying apparatus 1, that is, crystallization and drying of chips will be described in detail.
[0025]
As shown in FIG. 5, the air C1 discharged by the first blower 80 is branched into hot air C2 and cold air C3, and the hot air C2 is increased in wind speed and air volume by the second blower 81, It passes through the filter 82 and the heater 83 which is the hot air supply source 33, and is supplied into the hopper 10 through the hot air supply device 30. On the other hand, the cold air C3 passes through the cooler 84 and the filter 85, which are the cold air supply source 43, and then is branched and distributed to the cold air C4 and the second cold air supply device 60 distributed to the first cold air supply device 50. It is supplied to the hopper 10 separately from the cold air C5.
[0026]
In the hopper 10 to which hot air and cold air are supplied as described above, in the second cylindrical portion 13 provided with the hot air supply device 30, the supplied hot air rises as a swirl flow, and the hot air rises and floats and diffuses. A drying zone for drying the crystallized chip to be formed is formed. Therefore, in this drying zone, it can adjust with the 2nd air blower 81 and the heater 83 so that hot air of high temperature sufficient to dry a crystallization chip | tip may be supplied. In addition, since the 2nd cylindrical part 13 is a straight cylinder with a thin diameter continuously provided by the lower end of the tapered cylindrical part 12 of the upper part, it can suppress the supply amount of a hot air low.
[0027]
Further, the tapered cylindrical portion 12 sandwiched between the first cold air supply device 50 and the second cold air supply device 60 on the upper side is supplied from the hot air rising from the lower second cylindrical portion 13 and the second cold air supply device 60. The tapered cylindrical portion 12 forms a crystallization zone. Therefore, in the tapered cylindrical portion 12, by adjusting the set temperature of the cooler 84 and the amount of cool air supplied from the second cold air supply device 60, the temperature necessary for crystallization and the crystallization are necessary. The floating time of the chip can be ensured, and there is no fear that an amorphous chip will be completed due to insufficient temperature and insufficient heating time, or that the chip will melt due to excessive heating.
[0028]
Further, the upper first cylindrical portion 11 is a region where hot air rising from the tapered cylindrical portion 12 and cold air supplied from the first cold air supply device 50 are mixed, and is heated by the hot air rising from the tapered cylindrical portion 12. The temperature drop due to cold air can be adjusted so that the chip does not melt before it is crystallized.
[0029]
Finally, the air supplied into the hopper by the hot air supply device 30 and the cold air supply device 40 is discharged outside the hopper from the exhaust pipe 16 at the top of the hopper.
[0030]
By the way, in the drying device, when the synthetic resin, especially PET chips, are crystal dried by sending hot air from the bottom to the top in the direction opposite to the chip discharge direction, the change in the exhaust temperature of the hopper in the conventional drying device is It varies depending on the amount of chips used or the temperature of hot air at the material inlet. When this exhaust temperature becomes high, the chip is easily solidified in the vicinity of the material inlet at the same time as the introduction. Since the PET chip called new synthetic fiber requires a long time for crystallization, the inserted chip is fused due to a high temperature change of the exhaust temperature, which may cause problems in manufacturing and cause problems in the product. It is.
[0031]
Therefore, like the drying device of this embodiment, if the exhaust temperature can be adjusted, the temperature of the exhaust can be kept constant with respect to the change in the amount of chip used. The amount of hot air used is small, and the purpose of energy saving can be achieved. Chips crystallized under temperature control do not fuse even if the temperature is raised quickly. Unlike conventional devices, the diameter of the hopper is reduced, so the passing speed of hot air in the drying zone can be kept constant. There is an effect that dry spots do not occur. In the crystallization zone, by supplying cold air to the hot air rising from the drying zone, it can be adjusted to the crystallization temperature consistent with the physical properties of the chip. As a result, if the speed of the air in the hopper is kept constant and the weight of the tip and the force of rising hot air are kept in balance, the tip becomes floating and the resistance to stirring is reduced. Can be saved. In addition, since the hopper diameter is reduced from the lower dry zone to the upper cold air mixing region through the crystallization zone, the entire shape is a right circular cylinder with the same diameter as in the conventional apparatus. Compared with the device, the amount of hot air can be reduced by 30% or more. In addition, in the conventional apparatus, in order to make the air velocity in the hopper constant throughout, it is necessary to increase the amount of hot air, and there is a disadvantage that the exhaust gas temperature cannot be controlled. Can overcome the disadvantages. Furthermore, since the chip can be floated by supplying cold air from two or more stages in the upper and lower stages, the necessary time and necessary temperature for crystallization can be controlled.
[0032]
Note that the present invention is not limited to the above-described embodiments, and includes a wide variety of modifications without departing from the spirit of the present invention.
[0033]
【The invention's effect】
The drying device according to the present invention supplies cold air to the middle of the drying device, makes the lower hopper thinner than the upper hopper to change the ratio of length to diameter (L / D), and upper and lower hoppers By providing a region where the diameter gradually changes in the middle part of the glass, it becomes possible to prevent temperature control, energy saving and solidification of the chip, and the conventional crystallization including a high value-added fiber raw material chip called new synthetic fiber It becomes possible to crystallize and dry the granular compatible resin material, which has been difficult.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a drying apparatus according to the present embodiment.
FIG. 2 is a schematic cross-sectional view of a drying apparatus according to the present example.
FIG. 3 is a schematic view of a hot air supply device according to the present embodiment.
FIG. 4 is a schematic view of a cold air supply device according to the present embodiment.
FIG. 5 is a block diagram showing a circuit for supplying and discharging hot air and cold air to the drying apparatus according to the present embodiment.
FIG. 6 is a schematic view showing a conventional example.
[Explanation of symbols]
A ... Chip B ... Crystallization chips C1-C5 ... Air flow d ... Gap between the inverted conical portion at the bottom of the hopper and the hot air contact member 1 ... Drying device 10 ... Hopper DESCRIPTION OF SYMBOLS 11 ... 1st cylindrical part 12 ... Tapered cylindrical part 13 ... 2nd cylindrical part 14 ... Reverse cone-shaped part of hopper lower part 15 ... Material inlet 16 ... Exhaust pipe 17 ··· Product discharge port 20 ··· Stirrer 21 ··· Rotary shaft 22 ··· Blade 23 · · · Hot air contact member 24 · · · Rotary mechanism 25 · · · Upper conical portion 26 of the hot air contact member ··· Lower hot conical part 30 of hot air hitting member 30 ... hot air supply device 31 ... hot air supply pipe 32 ... ring pipe 33 ... hot air supply source 31a ... tip of hot air supply pipe 32a ... ring pipe Base end portion 32b of the ring pipe branch end portion 40 ... Cold air supply device 43 ... Cold air supply source 50... First cold air supply device 51... First cold air supply pipe 52... Ring tube 52 a .. Base end portion 52 b of the ring tube. 2 cold air supply device 61... Second cold air supply pipe 62... Ring tube 62 a .. base end portion 62 b of ring tube .. branch end portion 80 of ring tube. Blower 82 ... Filter 83 ... Heater 84 ... Cooler 85 ... Filter

Claims (1)

A straight cylindrical first cylindrical portion is connected to the upper portion and coaxially connected to the lower portion of the first cylindrical portion. The diameter of the upper end is the same as the diameter of the first cylindrical portion, and the diameter is gradually reduced downward. Consisting of a tapered cylindrical portion and a second cylindrical portion that is coaxially connected below the tapered cylindrical portion and has a diameter that is the same as the diameter of the lower end of the tapered cylindrical portion and that has a lower cylindrical shape formed in an inverted conical shape. A hopper,
A hot air contact member in the form of an abacus ball arranged in the hopper, wherein at least the lower conical portion of the lower half is located inside the reverse conical portion of the lower part of the hopper,
A stirring member comprising an axis extending upward from the hot air contact member and a blade extending laterally from the axis;
A hot air supply pipe for supplying hot air to the inverted conical portion of the hopper, and a plurality of hot air supply pipes are provided around the inverted conical portion of the hopper, and each hot air supply pipe is inclined so as to be downward toward the tip side. A hot air supply pipe positioned so that an extension line of the axial center of each hot air supply pipe reaches the peripheral surface of the lower half inverted conical portion of the hot air contact member;
A first cold air supply pipe for supplying cold air into a hopper provided around the cylindrical portion near the boundary between the first cylindrical portion and the tapered cylindrical portion of the hopper;
A second cold air supply pipe for supplying cold air into the hopper provided around the cylindrical portion near the boundary between the tapered cylindrical portion and the second cylindrical portion of the hopper;
A crystal drying apparatus for a granular synthetic resin material, comprising:

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