JPH0614974Y2 - Dehumidifying dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Field The present invention relates to a dehumidifying dryer for dehumidifying and drying polyester resin pellets, nylon resin pellets, and the like.

(B) Conventional technology As the dehumidifying dryer of the above-mentioned example, for example, Jikken Sho-2
There is an apparatus described in Japanese Patent No. 101. That is, in this dehumidifying dryer, the dehumidified air dehumidified by the molecular sieve multi-cylinder dehumidifier for dehumidification is heated to a predetermined temperature by a heater and supplied into the drying hopper.

However, the above-mentioned resin pellets have extremely high water absorption, and since the residual heat of the heated dehumidified air remains in the resin pellets immediately after drying, if the resin pellets contact the outside air, The resin pellets absorb moisture contained in the resin pellets.As a result, the moisture absorption rate of the moisture contained in the raw material of the resin pellets changes the quality of the product molded by the molding machine using the resin pellets as a raw material, resulting in a uniform product. However, there is a problem that molding becomes difficult.

Further, when cooling the resin pellets processed by the above dehumidifying dryer, it is necessary to discharge the dried resin pellets from the drying hopper once, and then put the cooling resin in the dedicated hopper for cooling treatment. Not only is it troublesome to replace the pellets, but the resin pellets may come into contact with the outside air and absorb moisture when the pellets are replaced.

(C) Purpose of the invention The invention is to dry resin pellets that have been dried by using a unique configuration in which the dehumidified and dried resin pellets supplied from the drying hopper into the cooling hopper are cooled by the cooled dehumidified air. In the dehumidified and dried state, it can be cooled without absorbing moisture, and good resin pellets suitable for molding can be obtained, and dehumidification and drying of resin pellets can be performed efficiently and continuously. The purpose is to provide a machine.

(D) Configuration of the invention In this invention, a cooling hopper for cooling the resin pellets after dehumidifying and drying is connected in an airtight manner to the lower part of the drying hopper for dehumidifying and drying the resin pellets, and connected to a dehumidifying unit for dehumidifying outside air. A dehumidifying dryer in which one branch line of the dehumidified air supply line is connected to the drying hopper via a heater and the other branch line of the dehumidifying air supply line is connected to the cooling hopper via a cooler. It is characterized by being.

(E) Action of the device In this device, after the outside air is dehumidified by the dehumidifying unit, the dehumidifying air is passed through the dehumidifying air supply line connected to the dehumidifying unit and into the drying hopper through one branch line. Heater Dehumidifying air heated to a predetermined temperature is supplied, and after dehumidifying and drying the resin pellets in the drying hopper,
The dehumidified and dried resin pellets are dropped and supplied into the lower cooling hopper while maintaining airtightness that is shielded from the outside air.
Cooling dehumidifying air cooled to a predetermined temperature by a cooler is supplied from the other branch line into the cooling hopper to cool the dehumidified and dried resin pellets in the cooling hopper.

(F) Effect of the device According to this device, since the dehumidified and dried resin pellets are directly supplied from the drying hopper to the cooling hopper, the dehumidified and dried resin pellets do not come into contact with the outside air, and the cooled dehumidification is performed. With air, the resin pellets described above can be cooled without absorbing moisture in a dehumidified and dried state, and good resin pellets suitable for molding can be obtained. For example, a raw material for molding a homogeneous product in a molding machine or the like. Can be used as

Moreover, the above-mentioned resin pellets can be dropped and supplied from the upper drying hopper to the lower cooling hopper by natural fall, which saves the labor of replacing the dried resin pellets with a cooling hopper as in the conventional case. The dehumidifying and drying and the cooling process can be efficiently and continuously performed, and the piping for the resin pellet supply line and the like can be simplified.

(G) Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

The drawing shows a dehumidifying dryer for cooling dehumidified and dried resin pellets. In the drawing, this dehumidifying dryer 1 is provided with a dehumidifying unit 3 at a stage subsequent to a chilling unit 2 for generating cold water.
Is provided, and an air supply line 4 for dehumidifying air (hereinafter simply referred to as a dehumidifying air supply line) connected to the dehumidifying unit 3 is branched into two, and one branch line 4a is
A drying hopper 5 for dehumidifying and drying the resin pellets is connected via a heater 6, and the other branch line 4b is connected to a cooling hopper 7 connected to the lower portion of the drying hopper 5 in an airtight manner via a cooler 8. Connected.

The dehumidifying unit 3 described above connects a cooler 11 via a blower 10 to the outlet side of a filter 9 that cleans and filters the outside air, and supplies the dehumidifying rotor 12 with clean air cooled and dehumidified by the cooler 11. The air dehumidified by the dehumidifying rotor 12 is sent to the dehumidifying air supply line 4 via the blower 13 and the line filter 14.

In the cooler 11 described above, a cooling coil 15 is installed to allow the cold water generated in the chilling unit 2 to flow in a meandering manner.

The dehumidifying rotor 12 is formed by forming activated carbon into a honeycomb shape and impregnating it with a hygroscopic agent such as lithium chloride (LiCl), and is rotated at a low speed of 10 revolutions per hour, for example.

The dehumidifying rotor 12 is divided into a lower moisture absorption zone and an upper regeneration zone, and when the air cooled and dehumidified by the cooler 11 passes through the moisture absorption zone, the moisture in the air is combined with lithium chloride. Dehumidifying, on the other hand, to the regeneration zone, send the heated air heated by the regeneration heater through the regeneration filter,
The moist air after regeneration is discharged from the opposite side.

The air dehumidified by the dehumidifying rotor 12 described above is supplied to the blower 13
And a branch line 4a that is supplied to the dehumidifying air supply line 4 via the line filter 14 and is supplied to the one drying hopper 5 side in the middle of the dehumidifying air supply line 4 and the other cooling hopper 7 side. To the branch line 4b supplied to the.

The dehumidifying air supply line 4 is the branch line 4a on one side.
Is connected to the drying hopper 5 through a blower 16 for air pressure feeding and a heating heater 6 that heats the dehumidified air to a predetermined temperature, and the branch line 4a is extended to a center of a lower portion inside the drying hopper 5 by a predetermined length. Then, a taper cone 4c that evenly diffuses the dehumidified air is formed at the end of the line.

The above-mentioned heating heater 6 is an internal electric heater (not shown).
Is energized to heat the dehumidifying air passing therethrough to a predetermined temperature and supply it to the drying hopper 5. The heated dehumidifying air dehumidifies and drys the resin pellets A in the drying hopper 5, and the moist air moves upwards. It is discharged from the exhaust port 5a through the cyclone 17 to the outside of the machine.

The other branch line 4b is connected to the cooling hopper 7 via a blower 16 for air pressure feeding and a cooler 8 that cools the dehumidified air to a predetermined temperature, and the above-mentioned branch line 4b.
Similar to a, the taper cone 4c extends a predetermined length inside the cooling hopper 7 and diffuses dehumidified air to the end of the line.
Is formed.

The cooler 8 described above circulates cold water in a meandering manner, cools the dehumidifying air passing therethrough to a predetermined temperature and supplies the dehumidifying air into the cooling hopper 7, and the dehumidifying air inside the cooling hopper 7 is dehumidified by the cooled dehumidifying air. The dehumidified air that has cooled the dried resin pellets A and that has been warmed by the residual heat of the resin pellets A is branched through the return line 18 and the bag filter 19 that are connected to the exhaust port 7a above the cooling hopper 7. Returned to line 4a.

The resin pellets A loaded into the lower loading hopper 20 are fed into the above-mentioned drying hopper 5 through the feed line 21 and the suction loader 22 above the drying hopper 5.

An air suction device 24 is connected to the suction loader 22 via an exhaust line 23.
Is equipped with a bag filter 25 and a suction blower 26, and the air sucked through the exhaust line 23 by the suction action of the suction blower 26 passes through the bag filter 25 and is discharged to the outside of the machine and is supplied by this suction action. Line 21
The resin pellet A is sucked into the suction loader 22 via
It is dropped and supplied into the drying hopper 5.

At the outlet of the lower part of the above-mentioned drying hopper 5, a valve 27 for dropping and supplying the dehumidified and dried resin pellet A into the lower cooling hopper 7 is provided, and the lower end of the lower cooling hopper 7 is provided. At the outlet, a valve 2 for taking out the resin pellet A that has been dehumidified and dried and that has been cooled.
8 are provided.

The operation of the dehumidifying dryer 1 configured as described above will be described below.

As shown in the figure, the clean air that has passed through the filter 9 of the dehumidifying unit 3 is cooled to a low dew point by the cooler 11, is dehumidified to the limit in the moisture absorption zone of the dehumidification rotor 12, and is discharged from the opposite side. When the dehumidifying rotor 12 rotates, the honeycomb-shaped hygroscopic material absorbs water, and when it reaches the regeneration zone from the moisture absorption zone, the moisture is released by the heating air supplied from the regeneration heater (not shown), and is completely rotated during low-speed rotation. By drying and reaching the moisture absorption zone again, the moisture absorption action is performed, and by repeating this operation to continue the dehumidification work, dew point air from −30 ° C. to −50 ° C. can be obtained. Dehumidification is performed continuously by means of the filter 9,
It is possible to perform continuous operation for a long time without the need for clogging 14 and replacement of the cleaning / dehumidifying portion of the cooler 11.

Next, the dehumidified air dehumidified by the above dehumidification rotor 12 is
It is sent into the dehumidifying air supply line 4 through the blower 13 and the line filter 14 and is divided into the branch lines 4a and 4b.

The dehumidified air that has been branched to one branch line 4a is heat-treated at a predetermined temperature by the heater 6, that is, about 80 ° C. to 170 ° C., and is supplied into the drying hopper 5, and this heated dehumidified air is branched. The resin cone A in the drying hopper 5 is uniformly dehumidified and dried by being radially spread from the lower center of the drying hopper 5 upward from the taper cone 4c at the lower end of the line 4a.

The dehumidified and dried resin pellets A are dropped and supplied into the cooling hopper 7 by opening the valve 27 below the drying hopper 5, keeping airtightness that is shielded from the outside air, and then being diverted to the other branch line 4b. The dehumidified air is cooled to a predetermined temperature by the cooler 8 and supplied into the cooling hopper 7, and the cooled dehumidified air is fed from the taper cone 4c at the lower end of the branch line 4b to the lower center of the cooling hopper 7 in the same manner as described above. The resin pellets A that have been radially diffused upward and have been dehumidified and dried in the cooling hopper 7 are uniformly cooled.

During this cooling, the residual heat of the resin pellets A is about 60 ° C to 10 ° C.
The dehumidified air warmed up to around 0 ° C. passes through the return line 18 above the cooling hopper 7 and on the way to the bag filter 19
Then, the dust is removed and returned to the branch line 4a, reheated again to about 80 ° C. to 170 ° C. through the heater 6, and then supplied to the drying hopper 5 for dehumidification and drying.

In this way, the dehumidified and dried resin pellets A are directly supplied from the upper drying hopper 5 to the lower cooling hopper 7 while maintaining airtightness that is shielded from the outside air, so that the dehumidified and dried resin pellets A come into contact with the outside air. There is no such thing, it is possible to perform cooling processing without absorbing moisture in the dehumidified and dried state,
It can be used as a raw material for molding homogeneous products suitable for molding.

Moreover, since the above-described dehumidified and dried resin pellets A are dropped and supplied from the upper drying hopper 5 to the lower cooling hopper 7, there is no need to replace the dried resin pellets A with a cooling-dedicated hopper as in the conventional case. Omitting, the dehumidifying and drying process and the cooling process can be efficiently and continuously performed.

Furthermore, when the resin pellet A is cooled, the residual heat is about 6
When the dehumidified air warmed up to around 0 ° C to 100 ° C is reheated by the heater 6 to a temperature for dehumidifying and drying, that is, around 80 ° C to 170 ° C, it is reheated to a temperature difference of around 20 ° C to 70 ° C. Since only the heating is required, the heating capacity of the heater 6 can be small, and at the same time, the thermal efficiency is good and it is economical.

Further, as shown in the embodiment, when the dehumidifying rotor 12 is formed of activated carbon, that is, active carbon in a honeycomb shape and impregnated with a hygroscopic agent such as lithium chloride (LiCl), a conventional molecular sieve is used. Unlike the cylindrical type, it has an extremely large water adsorption force, and can continuously and stably obtain low dew point air, and the air flow resistance is also significantly reduced.

The present invention is not limited to the configuration of the above-described embodiment.

For example, the dehumidified and dried resin pellets A that have been processed in the cooling hopper 7 described above are molded through a closed air transportation passage that prevents contact between the outside air and the resin pellets A. It may be provided so as to be supplied to a machine or the like.

[Brief description of drawings]

The drawing is a system diagram of a dehumidifying dryer showing an embodiment of the present invention. A ... Resin pellets, 3 ... Dehumidifying unit 4 ... Dehumidifying air supply line 4a, 4b ... Branch line 5 ... Drying hopper, 6 ... Heating heater 7 ... Cooling hopper, 8 ... Cooler

Claims (1)

[Scope of utility model registration request] 1. A resin pellet (A) after dehumidification and drying is provided under a drying hopper (5) for dehumidifying and drying the resin pellet (A).
A cooling hopper (7) for cooling the air is connected in an airtight manner, and one branch line (4a) of the dehumidifying air supply line (4) connected to the dehumidifying unit (3) for dehumidifying the outside air is connected to the drying hopper ( 5) via a heater (6), and the other branch line (4) of the dehumidified air supply line (4).
A dehumidifying dryer in which b) is connected to the cooling hopper (7) through a cooler (8).