KR950014916B1 - Method for recycling waste plastic - Google Patents

Abstract

Polyethylene terephthalate is separated from the waste plastic bottle. The waste polyester plastic bottles are cut less than 15 cm in a first crusher, and alien matters such as a label are separated by an air separator. The polyester is impregnated in this process, and polyethylene is separated and washed by a chemicals and water. The separated polyethylene is dewatered and dried by a centrifugal separator, and crushed less than 1 cm in second crusher. Aluminium is removed from the polyethylene compound to give the polyethylene terephthalate particles.

Description

Separation and Recycling Method of Plastic Waste Materials

1 is a waste material recycling treatment process showing an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: Plastic waste material 2: Primary grinder

3: air separator 4: primary material separator

5: chemical washing device 7: centrifuge

10: PET recycled products

The present invention relates to a method for separating and regenerating plastic waste materials, and in particular, a waste container made of plastic containing a beverage or yogurt, such as cola, cider, etc., which is first pressurized with large particles and separated and processed into chemicals. The object of dehydration and dehydration by centrifugation is to make the secondary material crushed into fine particles and reuse the recycled materials from which aluminum is removed.

Here, plastic is mainly made of unsaturated polyesters (PET), PE, PP, HDPE, etc., such as PET bottles and PE, PP, HDPE containers, etc., which mainly use beverages including cola, cider, etc. as bottles. High density polyethylene (HDPE) base cups, aluminum caps and paper labels or rayon labels, adhesives, and the like are applied to the containers to form plastic containers.

Conventionally, recycled materials of various plastics have been reprocessed by various types of methods, and PET, PE, PP, and HDPE containers have been manually reprocessed, but are separated according to the type and shape of the plastic container to be recovered. Due to the need to be reprocessed, there were various problems in terms of product recycling and productivity.

In other words, the aluminum cap and HDPE base cup and other attached foreign matters must be separated by hand, and the work efficiency is low and the attachments such as labels are crushed and processed, or the labels are roughly peeled off and the solution of toluene, etc. It is used as a general work process by removing and grinding aluminum or polyethylene by adding it to the general work process.However, it is necessary to use an expensive toluene solution and manually remove the label. There was a drawback that it was impossible to produce at a low price by increasing the cost of regeneration production.

The present invention is mechanically primary pressure cutting and grinding the plastic waste in the state without the separation and removal work dependent on the manual operation in order to solve the conventional problems such as the conventional paper and rayon and other foreign matters collected in the separator using air PET is stagnated with a material separator using a conveyor screw, HDPE, PE, PP, etc. are kicked off, washed, washed, dehydrated in a centrifuge and dried, and then crushed in a second grinder to remove aluminum and finally recycled only PET recycled products. It presents a waste material separation and recycling system for separating raw materials.

One embodiment of the present invention will be described in detail by dividing according to the manufacturing process according to the accompanying drawings.

[Step 1]

The plastic waste materials (1) made of various plastic containers, etc. collected are transported to a conveyor and sorted during the transfer, and the sorted materials are compressed and crushed to a suitable particle size of about 15 cm or less in the primary mill (2). The paper label and rayon label 11 mixed in the compression-crushed plastic in the first mill are separately separated from the milled plastic by an air separation method using pressurized air and a blower in the air separator 3. At this time, some small foreign matter adhering to the crushed plastic is removed by the pressurized air of the blower.

[Step 2]

Send the plastic pulverized product separated from paper, rayon label 11, etc. by the first process to the primary material separator 4 using a screw conveyor to precipitate the polyester (PET), and not to precipitate PE, PP and HDPE are rolled out and separated.

At this time, the separated PE, PP, and HDPE are separately collected and recycled, and the remaining polyesters (PET) are transferred to the screw conveyor and transferred to the chemical washing apparatus (5) using organic solvent detergents such as toluene. It also minimizes the loss of cleaning chemicals by completely attaching a circulation facility using filter, etc., to completely clean the remaining foreign substances in the process and to minimize the loss of cleaning liquid.

[Step 3]

The cleansed plastic crushed material by the second step is washed with clean water so that there is no residual chemical in the water washing device 6 by flowing water, and put into a centrifuge 7 and dehydrated and dried.

At this time, the centrifuge used is capable of simultaneously dehydrating and drying by centrifugation using a vertical centrifugal drum or a horizontal drum. The water used can be reused through pollution prevention facilities and water purification facilities to prevent wastewater leakage. Don't have it at all.

[Step 4]

The primary pulverized product of the chemical washed and dehydrated plastic by the third process is crushed into particles of a suitable size of about 1 cm or less in the secondary pulverizer 8 and placed in the secondary material separator 9 to recycle aluminum and PET. Separate (10).

The aluminum separated in the material separator 9 is collected and treated in a separate collection device, and the remaining PET regenerated material is packaged with recycled raw materials.

The recycled raw material treated by the separate regeneration method as described above may be utilized as a raw material for other raw materials such as chemical fibers, and a preferred embodiment of the present invention may be used to transport waste materials such as collected plastic bottles to a conveyor. After sorting and compressing to a particle size of 15 cm or less, the paper labels or rayon labels mixed with the pulverized plastics are cut and pulverized by pressurized air or blower, respectively.

By this process, the foreign substances in the plastic are separated and removed together with the paper label or the rayon label.

The cut and pulverized plastics from which foreign substances or labels are separated and removed are transferred to a material separation device using a screw conveyor, whereby the polyester is precipitated and the floating polyethylene is collected and separated and used as recycled material.

In this way, the remaining polyesters (PET) are washed by chemicals using organic solvents such as toluene, detergents, etc. while moving to the screw conveyor, and in principle, the circulation facility is attached to minimize the loss of chemicals. do.

Washing with water in the state of chemical washing is carried out simultaneously with dehydration and drying process using a centrifuge.

At this time, the centrifugal separator used may be a horizontal drum centrifugation method.

After washing with water, centrifugal dehydration drying method also has pollution prevention facilities and water purification facilities.

In this way, the dehydrated and dried plastic pulverized product is pulverized again in the second time, and the size of the particles is pulverized into particles having a suitable size of 1 cm or less, and aluminum is separately removed and separated from the material separation device. It is intended to be used.

PE, PP, HDPE and PET recycled materials using plastic bottles or containers treated by the regeneration method as described above can be used as raw materials for other raw materials such as chemical fibers. Not only is relatively inexpensive compared to the price of HDPE and PET, but if the plastic bottles or containers are simply thrown away, they will not perish permanently and damage nature, leaving them as pollutants. If recycled as raw materials, it can be said that the benefits such as pollution prevention can be obtained at the same time.

Claims (1)

In the known plastic waste material recycling raw material recovery method which makes it possible to separate a label and a foreign substance by the mechanical friction of waste materials, when grinding the plastic waste materials (1) which become waste products, such as a polyester plastic bottle and a container, the said grinder In the first pulverization of (2), press-cutting is less than 15 cm. In the air separator (3), the polyester is stagnated while the foreign substances such as labels are separated and the polyester is stagnated. The polyethylene is separated, washed with chemicals, and washed with centrifuge. Separating and drying the dehydrated to a particle less than 1cm in the secondary mill (8), and the aluminum is removed so that only PET reclaimed particles can be used as raw materials.