JPH04201522A - Vacuum drying device - Google Patents

Abstract

PURPOSE:To perform hot dehumidification and cold dehumidification under the vacuumized condition, or little oxidized condition, by sucking dispersed humidity immediately by a vacuum pump device with filter installed on a hopper cover and exhausting the same to the outside. CONSTITUTION:Pellets transferred by a rotating screw 5 and risen up are diffused on an upper pan 3. Heat is applied to said diffusing pellets by a heat source 6 right above the upper pan 3 installed on a hopper cover 2 to disperse humidity, and also the dispersed humidity is sucked by a vacuum pump device 7 installed on the hopper cover 2 and exhausted to the outside. Successively the pellets being dehumidified on the upper pan 3 are dropped into a hopper 1 starting from the outer periphery of the upper pan 3 and circulated again from a screw 5 onto the upper pan 3 to carry out dehumidification of pellets.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dryer for plasti and cupellet.

Previously, the dryer for Plasti and Kuberet 9T was installed in a container on a bridge, and a blower was used to send hot air and forcedly circulate the hot air to dry the pellets, and the pellets were stirred with hot air from the bottom of the pellets at full speed. Hopper dryers that dry while drying have become mainstream. In addition, there are hopper dryers that dry pellets by blowing air into them after heating them with microwaves (microwave oven method), but since they are all wind dryers, it is difficult to expect sufficient drying. For example, when polyamide pellets (nylon) are dehumidified at 90° C. for about 12 hours in these dryers, the pellets turn pale yellow but are still in an undried state. Then about 24
If dehumidification is carried out for a period of time, a moldable state with no air bubbles is reached, but it cannot be said that the drying is sufficient. Also, since the moisture absorption of berate is different and difficult to detect, it is also difficult to determine the drying time.Secondly, it is difficult to find examples and materials for vacuum dryers. This is thought to be due to problems with airtightness, pellet circulation equipment, and disassembly and cleaning.

The drying apparatus of the present invention will be explained with reference to the drawings. A pipe 4 with an upper plate 3 is provided in the center of a hopper 1 as shown in FIG. A screw 5 for driving a motor is provided at the center of the vibrator 4.

A heat source (thermal bulb or microwave oscillator) is provided on the hobper lid 2 directly above the screw 5. When the screw 5 is rotated by the motor, the pellets in the hopper 1 are sent to the upper part by the screw 5 and diffused from the center of the screw to the upper tray.

Apply heat from heat source 6 to the pellets being spread to pellet them.

The moisture in the container will evaporate and dissipate. A vacuum pump device 7 with a filter is provided on the hopper lid 2 to remove the released moisture.
is absorbed and discharged to the outside world. Therefore, re-absorption of moisture by the pellets on the upper tray 3 is extremely small. Subsequently, the dehumidified pellets fall from the outer periphery of the upper tray 3 along the inner wall of the sixth hopper 1, and the hot pellets are cooled by the outside air. The water is cooled by the inner wall of the hopper and reaches the lower part of the hopper where moisture is radiated by heat dissipation and is again circulated by the screw.

The apparatus of the present invention rapidly performs thermal dehumidification and cooling line temperature under oxidation conditions with 1V less in vacuum, resulting in a vacuum dryer with less deterioration of pellets, less energy consumption, and less noise.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the vacuum drying apparatus of the present invention.
is pellet flow port, 9 is vacuum gauge, 10fl thermocouple, 11
12 is a bolt for a hanging ring, and 13 is a handle.

Claims (1)

[Claims] A screw (5) having a pipe (4) with an upper plate (3) is provided in the center of the hopper (1) to raise the pellets in the hopper. The pellets sent upward by the rotating screw (5) are spread onto the upper plate (3). The pellets being dispersed are heated by a heat source (6) directly above the upper plate (3) installed in the hopper lid (2) and the moisture is evaporated. The pump device (7) sucks it up and discharges it to the outside world. Next, the pellets being dehumidified on the upper plate (3) fall into the hopper (1) sequentially from the outer periphery of the upper plate (3) and circulate again from the screw (5) to the upper plate (3) and repeat. A vacuum dryer designed to dehumidify bait pellets.