JPH01118410A - Continuously drying and feeding device of resin material - Google Patents

Abstract

PURPOSE:To enable cost down to be achieved by miniaturizing a microwave radiation dryer and the hopper of a forming machine, etc., by a method in which a plurality of microwave drying drums are mutually connected in parallel or series, whereby resin material is dried. CONSTITUTION:The supply of material into two batch type dryers A and B is carried out by the suction force caused by a blower 7 upon the opening of suction switching values 6A, 6B. Thus, the suitable amount of material is fed into material feeding hoppers A-1 and B-1, and is fed into microwave drying drums A-2, B-2, and then it is dried. After the material has been temporarily stored by feeding it into a relay hopper 3, the material is sucked and fed into the hopper 5 of a forming machine by using the suction force of a blower 7 and by opening a suction switching valve 6C. Thus, by the switching operation of the suction switching valves 6A, 6B, 6C, the suitable amount of material is fed into batch type dryers A, B, and the material dried in the dryer is fed into the hopper 5 of a forming machine. Thus, material supply is easily carried out by dry-treating the material with two dryers alternatively. The capacity of the dryer may be reduced to about 1/2, and a magnetron may be miniaturized.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention provides a continuous drying and supplying device for resin material that can continuously dry resin material in the form of powder and granules and continuously supply it to a molding machine. It is related to

[Background of the invention]

In the molding process of various plastics, water content in the raw material plastic powder is used.

As a result, the quality of the molded product is significantly affected.

That is, the plastic powder that is the raw material contains moisture.

It's not just that it looks bad if it's covered, but it's a work of art.

Since the dimensional accuracy and strength of the upper shell will decrease, the moisture content of the plastic powder should be reduced.

There is a need to reduce the amount of Especially in recent years.

Engineering plastisol is rapidly becoming popular.

In the field of plastics, ordinary resin products are also very expensive.

Because high finishing accuracy and excellent properties are required, it is necessary to reduce the moisture content of raw material plastics to an extremely low value.For example, PET (polyethylene terephthalate) for bolts and PC (polycarbonate for CDs) ), the moisture content must be below 50 PPM and below 100 PPM, respectively.

Therefore, it is necessary to dry the raw material plastic powder, but the conventional drying method of this type involves pumping high-temperature gas into a hopper to remove moisture from the plastic powder. A drying method that removes the particles and irradiation with microwaves generated by a magnetron.

A drying method has been proposed in which heat is applied to the dryer.

If the drying method uses high-temperature gas, drying will not be completed.

It requires a long time and even less dryness to obtain.

There is a problem that it is not very sticky. See you later.

In the drying method using microwave irradiation, which is

The drying speed is faster and better than the former hot air drying method.

However, it still makes the plastic powder uniform.

For heating, for example, polyethylene tereph.

For tallate resin, approximately 1.5 hours (160C).

Since this is necessary, examples that have already been tried, such as known examples.

According to the drying method disclosed in Japanese Utility Model Application Publication No. 61-205390.

However, it was difficult to install it in a molding factory. Therefore, batch type drying equipment has been considered, but in this case, it is necessary to transport the dried plastic powder to the molding machine hopper, so a molding machine hopper with the same capacity as the dry batch is required. In addition, it is necessary to take heat insulation measures to prevent the temperature of the resin from dropping while it is staying in the molding machine hopper, as well as moisture-proofing measures to prevent moisture from being reabsorbed. .

There is a problem with the size of the machine, and it is even bigger.

To request the amount of drying of plastic powder and granules.

A high output magnetron is required and is the king of this kind.

Production quantities are limited for industrial magnetrons.

The manufacturing cost is also very high because of the amount of water used.

It is necessary to take measures for cooling, which tends to complicate the equipment.

There was a direction.

[Purpose of the invention]

The present invention focuses on each of the above-mentioned problems.

It is dried using microwave irradiation, which has high drying efficiency.

The drying method is basically adopted.

Equipped with multiple relatively small microwave irradiation dryers.

Along with drying, they can be obtained from the dryer.

Plastic powder and granules are alternately and intermittently fed into the molding machine through the suction switching pulp operation.

□ 3 □ By making microwave irradiation dryers, molding machine hoppers, etc. smaller, and using mass-produced air-cooled magnetrons, it is possible to lower costs, and eliminate the gaps and illumination points of conventional methods. An object of the present invention is to provide a continuous drying/feeding device for resin materials.

[Embodiments of the invention]

The invention will be explained in detail below based on embodiments shown in the drawings.

Explain.

Example I In FIG. 1, A and B both have the same structure.

This is a batch type dryer, and this is a batch dryer with a capacity of 10,000 batches.

Dryer A uses material 2, which is plastic powder.

Hopper A-1 for supplying material and this material.

Supply material 2 stored in supply hombar person-1.

It has a microwave drying drum A-2 for drying.

Furthermore, within this drying drum A-2, there is a stirring blade A-4 rotated by a motor A-6° and a known microphone.

A mouth wave irradiation mechanism (not shown) is installed inside. B.

is the other punch type dryer, which is the batch type mentioned above.

Same as the drying fiA, use the material supply hot spring <-B-1 and □
4 □ Microwave drying drum B-2 and motor B-3.

Stirring blade B-4 and microwave irradiation mechanism - group or two.

It has more than one group (not shown). 6 is batch type.

Temporarily dry materials derived from dryers A and B.

4 is a molding machine.

A molding machine hopper 5 is provided on the molding machine 4.

There is. 6A, 6B, and 6C are air suction switching pulses.

The switching valve 6A switches between the blower 7° and the material supply pump A-1.

Valve 6B is a blower 7 and a material supply hopper.

B-1, and the switching valve 6C is connected to the blower-7.
and the molding machine flopper 5.

Note that 8A is a material that leads to the material supply hopper A-1.

Material suction nozzle, 8B is material supply hopper B-.

1 indicates a material suction nozzle, and 9 indicates a filter.

vinegar.

The above is the configuration of this embodiment. Next, to describe its operation, the material 2 is supplied to the two batch dryers A and B by the blower 7 by opening the suction switching pulp 6A and 6B. Can be supplied by suction. Therefore, by opening and closing the suction switching pulps 6A and 6B, an appropriate amount of material 2 is supplied into the material supply and drying drums A-1 and B-1, and then into the microwave drying drums A-2 and B-2. supply.

Microwave drying of the material is then carried out. Hidden.

The dried material 2 is supplied into the relay hopper 6.

and then - after being temporarily stored, the suction switching bar.

Utilize the suction power of blower 7 by opening lube 6C.

It is sucked and supplied into the molding machine hopper 5 and prepared for molding.

It is something that can be done. As described above, in this embodiment, the suction switching operation for switching the pulps 6A, 6B, and 6C is suitable.

Quantity of materials in total batch dryer A and B, as well as it.

The material is dried using a bunch dryer and then molded.

For example, it can be supplied to the phone bar 5.

For example, as shown in the time chart of Figure 2, suction.

Operate the switching pulp 6A to supply the appropriate amount of material.

After supplying the drying drum A-1 to the drying drum A-1, the drying drum A-2 is operated for about 1.5 hours (temperature rise and constant temperature),
Next, during drying by the drying drum A-2, the suction switching pulp 6B is operated to supply an appropriate amount of material to the material supply hopper B-2, and drying is performed by the drying drum B-2 for about 1.5 hours. By performing (temperature increase and constant temperature), by operating the suction switching pulp 6C, both batch dryers A,
The materials dried in step B are alternately fed into the molding machine hopper 5.

It is something that can be done.

Therefore, in this embodiment, the operation of each suction switching pulp.

Based on the above, both of the two bunch dryers A and H are used.

The materials are alternately dried and supplied to the molding machine hopper 5.

It is easy to manage the supply of materials.

It's easy. Also, the capacity of the batch dryers A and B.

The amount is the capacity of one conventional batch dryer.

Since it only takes about 1/2 compared to the previous batch, the batch is achieved.

The magnetron has become smaller due to the downsizing of dryers A and B.

Economical efficiency is improved by using low-cost products, etc.

This makes cleaning work easier and management easier.

It has the effect of Note that this example uses a batch method.

Although two dryers are used, the object of the present invention can be achieved with two or more dryers. Further, although the relay hopper 3 is used in the above embodiment, the relay hopper 3□ 7 □ can be omitted.

Example ■ In Figure 3, this example uses two batch type drying M
A and B are arranged and used in series. Note that the structure in this example is abbreviated to the above example.

Since there is no change, the structurally identical parts are the same as above.

The reference numerals cited in the examples will be used, and the structural description will be omitted.

Ru.

That is, in this embodiment, the suction switching pulp 6A.

A hopper for supplying a certain amount of material through the operation of the hopper.

Supplied into A-1 and dried with this batch drying MA.

The dried material is transferred to drying drum B of bunch dryer B.

-2 for drying again.

I can buy things. Therefore, according to this embodiment, there are two dryers.

The drying materials are separated into drying drums A-2 and B-2.

For example, drying for 1.5 hours.

For materials such as PET resin that require time, the drying time for each drying drum A-2 and B-2 may be 0.75 hours. Two magnetrons are installed to control the constant temperature.One magnetron is installed in the drying drum B-2 to raise the temperature and separate the constant temperature, which requires a large amount of heating energy. Effects such as being able to reduce the microwave heat source of the constant-temperature drying drum and the microwave heat source can be obtained.

[Summary of the invention]

As described above, the present invention provides a microwave irradiation unit.

The material is made of plastic granules.

In the drying supply device for microwave drying, my.

Connect multiple chroma wave drying drums in parallel or series.

At the same time, transfer the material to the microwave drying drum.

Supply and molding machine hone from the microwave drying drum.

Supply to the par is performed by switching the suction switching pulp.

A continuous dry supply device for resin materials characterized by:

be.

〔Effect of the invention〕

Therefore, according to the present invention, since a plurality of microwave drying drums are used, each microwave drying drum can be made smaller, so that the power of the magnetron used can be small. , which has the effect of increasing economic efficiency. In addition, due to its miniaturization, handling,
It also has the effect of reducing management.

Further, the supply of materials to each dryer or the transportation of materials for supplying materials to the molding/forming machine can be carried out by switching the suction switching valve.

Ability to automatically and accurately manage material supply.

There are also fruits.

[Brief explanation of the drawing]

FIG. 1 shows a first embodiment of a device according to the invention. Fig. 2 is a time chart of the operation. FIG. 3 is an explanatory diagram showing a second embodiment of the present invention. Figure 4 is a time chart of the operation. A, B... Punch type dryer A-1, B-1... Material supply hopper A-2) B-
2... Microwave drying drum A-6, B-3... Motor A-4, B-4... Stirring blade 2... Material 6... Relay hopper □11□ 4... Molding Machine 5... Molding machine hopper 6A, 6B, 6C... Suction switching pulp 7... Blower 8A, 8B... Suction nozzle 9... Filter Patent applicant: Matsuji Nakagomi. Agent: Patent attorney Tadashi Nakayama 1.Yoshi, '. □ 12 □

Claims (1)

[Claims] 1) In a drying supply device that is equipped with a microwave irradiation unit and that microwave-dries plastic powder or granular material, a plurality of microwave drying drums are connected in parallel or in series to perform drying. 1. A continuous drying supply device for a resin material, characterized in that the continuous drying and supplying device is configured to continuously dry and supply a resin material. 2) In the continuous drying and supplying apparatus for a resin material according to claim 1, the supply of the material to each microwave drying drum and the supply from the microwave drying drum to the molding machine hopper are controlled by a suction switching valve. A continuous drying and supplying device for resin materials characterized by selective operation through switching operations.