KR20010074581A - Grinding method of waste tires and waste synthetic resin - Google Patents

Abstract

PURPOSE: A method for producing powdered material from rubber and synthetic resin wastes is provided to utilize re-used material same to the original raw material for molding the product by regenerating the reused material in the form of powders and/or granules. CONSTITUTION: The method comprises a cutting process of synthetic and rubber waste into less than 30-50mm of length; a grinding process of the cut material into less than 3mm of size; a selecting process of 3mm or less material by passing the ground material through a moving sieve of 3mm mesh size; a powdering process of the selected material by introducing the material into a vacuum tank, freezing it with a coolant of -100 to -200 deg.C, and gently agitating as well as grinding it in a screw type mixer attached at lower part of the tank into #20 or less of size; a drying process of the obtained material in a vacuum dryer; both of classification processes of the ground particles according to specific gravity then magnetic property thereof; and a final package process of the product.

Description

Grinding method of waste tires and waste synthetic resin

The present invention relates to a method of pulverizing waste rubber and waste synthetic resins, which are powdered to recycle waste rubber and waste synthetic resins received.

Due to the development of the industry, a lot of wastes are generated in each field, and waste-related companies are investing a lot of development cost in research to recycle wastes.

For example, in the case of waste rubber and waste synthetic resins, a recycling apparatus has been developed and used to recycle and recycle them, but a more convenient and efficient recycling method related to the recycling of waste synthetic resins or waste tires, such as waste vinyl and waste nets, is difficult to recycle. The development of is very poor.

In other words, waste tires generated by the increase in the penetration rate of automobiles, waste vinyl generated in rural areas, or nets generated in fishing villages are difficult to process due to their large volume, particularly in waste vinyl used in plastic houses or fishing villages. Waste nets, etc., have a lot of soil, small impurities, etc. in the use process as well as the collection process, and feel a considerable difficulty in regenerating them.

Therefore, in order to regenerate waste vinyl generated in a plastic house or waste net generated in a fishing village, it is necessary to remove soil and small impurities from waste vinyl or waste net. Since additional operations such as sorting and cutting are required to process waste vinyl or waste net bundles, it is expensive to recycle even though they are recycled, and the added value is lowered to avoid their recovery.

As a result, unrecoverable waste cannot be stored in the storage for a long time, and thus, an incineration process is being performed, and thus air pollution due to the release of substances such as dioxins into the atmosphere is getting serious.

On the other hand, PET bottles widely used as beverage containers are made of high-quality synthetic resins, but there is no way to collect them and recycle them into beverage containers. When shaping the container, the ground chips are mixed with the raw materials, resulting in waste of quality resources.

In addition, in order to recycle the collected recyclables, the workers must sort and store them according to the type of resin and dissolve them when a certain amount is collected. Since there is a lot of need for a large factory site had to be.

The present invention has been made to solve such a conventional problem, it is an object of the present invention to be recycled in the form of powder or granules to be used in the same way as the raw materials used when molding the original product.

Another object of the present invention is to enable the automatic sorting of the various types of synthetic resins by type in the process of being discharged in a mixed powder state.

According to an aspect of the present invention for achieving the above object, the step of sorting the received waste synthetic resin and waste rubber to cut to 30-50mm or less, and finely grinding the waste synthetic resin and waste rubber cut in the process to 3mm or less Passing the finely pulverized waste synthetic resin and waste rubber with a constant vibration, and sorting only the raw materials crushed to 3 mm or less, and re-inputting more raw materials to the crushing process, and vacuuming the raw materials sorted to 3 mm or less. Process into powder into powder # 20 or less in a mill-type screw mixer installed in the lower part of the tank while freezing the raw material with -100-200 ° C or less refrigerant generated by a high pressure cooler after entering into a tank in a state. And drying the powdered raw material in a vacuum dryer to remove moisture; Characterized in that it comprises a first step of sorting according to the characteristics in the process, a second step of classifying the first sorted powder raw materials according to the magnetic properties of each particle using static electricity, and a step of packaging the second sorted powder raw materials Provided is a method of powdering waste rubber and waste synthetic resin.

1 is a process diagram for implementing the present invention

Figure 2 is a flow chart for explaining the manufacturing method of the present invention

* Description of the symbols for the main parts of the drawings *

2: cutter 4: grinder

6: sorter 8: high pressure cooling powder stirrer

9: high pressure cooler 11: dryer

13: centrifuge 15: electrostatic secondary sorter

20 extruder 22 cutter

Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 and 2.

Figure 1 is a process chart for implementing the present invention and Figure 2 is a flow chart for explaining the manufacturing method of the present invention, the present invention is a waste plastic (PE, PP, polyester, etc.) and waste rubber stock (stock) 1) After transporting, put into cutting machine (2) and cut to 30-50mm or less according to the rotation of rotary knife. (S1)

In the above process, the cutting length of the waste synthetic resin and the waste rubber is set to be smaller and thicker as the thickness is thicker. If the length is 50mm or more, the motor is overloaded in the process of finely crushing the waste synthetic resin and the waste rubber in the crushing process. There is a closed end where the motor is burned out.

The waste synthetic resin and waste rubber cut in the above process are transferred by a conveying means 3 such as a conveyor belt, put into the grinder 4, and finely pulverized to 3 mm or less. (S2)

When the waste synthetic resin and waste rubber are pulverized to 3 mm or more, the powdering efficiency decreases in the process of powdering in a later step.

The waste synthetic resin and waste rubber finely pulverized by the pulverizer are transferred by the conveying means 5 such as a conveyor belt, and then put into the vibrating sorter 6, and then passed through moving with constant vibration to be pulverized to 3 mm or less. Only raw materials are selected (S3).

Raw materials of 3 mm or more that do not pass through the shreds in the above process are re-input in the grinding process and regrinded to 3 mm or less.

Thus, the raw material sorted to 3mm or less is put into the tank of the high pressure cooling powder stirrer 8 using a screw-type feeder 7 and powdered. The inside of the tank of the high pressure cooling powder stirrer is a high pressure cooler 9. A raw material of powder # 20 or less is obtained by passing a mill-type screw-type mixer installed in the lower part of the tank while freezing the raw material supplied by supplying a refrigerant having a temperature of -100-200 ° C. or lower generated therein. (S4 )

When the powder raw material is obtained by the above process, the raw material is transferred using a tubular feeder 10 which maintains a vacuum state and supplied to the interior of the dryer 11 and then heated. Since residuals of the refrigerant remaining on the surface of the raw material remain intact in the dryer 11 in a vacuum state, appropriate heat is removed to remove moisture. (S5)

The powder raw material from which the moisture is removed by the dryer 11 is transferred using a tubular feeder 12 which maintains a vacuum state and introduced into the centrifuge sorter 13 to be first sorted according to the characteristics of specific gravity for each particle. (S6)

Thereby, foreign substances, such as metals and paper contained in powder raw material, are removed by the specific gravity difference by particle | grains.

Powder centrifugally sorted according to the characteristics of the specific gravity of each particle in the centrifugal sorter 13 is transferred to the inside of the electrostatic type secondary sorter 15 by a tubular feeder 14 which maintains a vacuum state, thereby causing magnetic force for each particle. Classify according to characteristics (S7).

However, if the amount of the primary sorted powder raw material is not large enough to be classified by the electrostatic secondary sorter 15, it is collected and stored in a separate hopper 16, and when the predetermined amount is more than a tubular transfer to maintain the vacuum state By using the group 17 may be transferred to the interior of the electrostatic secondary sorter 15 may be secondary sorting according to the magnetic properties of each particle.

Thus, the raw materials of the waste synthetic resin and the waste rubber classified second by component are shipped in unit packaging, or stored in a separate cyclo 18, and then packed in units when a certain amount is collected.

On the other hand, although the second-class synthetic resin may be shipped in powder form, it may be shipped in a granular form through a post-process.

That is, the second sorted waste synthetic resin powder raw material is introduced into the extruder 20 using the screw feeder 19, and then extruded thinly by applying heat at 100-150 ° C. (S9).

The raw material extruded to a predetermined thickness in the extruder 20 is directly cooled or air-cooled in the cooler 21 at the same time, and the cooled raw material is cut to a length of 1-3 mm in the cutter 22 ( S10) It is possible to ship by packing by the unit weight in the packing machine 23.

As described above, the present invention is finely pulverized waste synthetic resin and waste rubber and then sorted by type to recover high quality synthetic resin and rubber, thereby reducing the cost of purchasing raw materials.

In addition, the recycling of waste synthetic resins and waste rubber prevents the generation of air pollution due to incineration, as well as the high value added by recycling them.

Claims (2)

Selected waste synthetic resin and waste rubber to be cut to 30-50mm or less, and finely crushed waste synthetic resin and waste rubber cut to 3mm or less, and finely pulverized waste synthetic resin and waste rubber Only the raw materials pulverized to 3mm or less are passed through the moving parts by vibration, and further raw materials are re-input to the crushing process, and the raw materials sorted to 3mm or less are put into a vacuum tank to be produced by a high pressure cooler. The process of pulverizing the raw material to powder # 20 or less in a mill-type screw mixer installed in the lower part of the tank while freezing the raw material with a refrigerant of -100-200 ° C. or lower, and drying the powdered raw material in a vacuum dryer. The process of removing moisture by drying in the water, the process of firstly classifying the powdered raw material into a centrifugal sorter according to the characteristics of the specific gravity of each particle, and the first classifying And a step of secondly classifying the powdered raw materials according to the magnetic properties of the particles using static electricity, and packaging the secondly sorted powdered raw materials. The method of claim 1, Dissolving the powder raw material and extruding it to a predetermined thickness, and cooling the extruded raw material, and then cutting and packing the raw material into lengths of 1-3 mm. How to be mad.