KR101839549B1 - The manufacturing method of the waste pellets - Google Patents

Abstract

The method for producing the waste synthetic resin pellets according to the present invention is as follows.
A crushing step of crushing the combustible waste W to produce a primary piece G and a crushing step of forming a secondary piece K by cutting the primary piece G and screening it after screening, (M) by mixing the secondary piece (K) and the non-combustible waste after the crushing step, and stirring the mixture (M) while heating the mixture (M) H); and after the melting step, extruding the melt (H) into a die (330) to form a noodle-like strand (N); and after the extruding step, N) to cut the waste synthetic resin pellets (P).
Therefore, since the flammable waste W is melted and the physical properties such as heat resistance, abrasion resistance, and durability of the non-combustible waste are combined, it can be recycled as various structural products.
In particular, by recycling incombustible non-combustible wastes, it not only prevents environmental pollution but also has the effect of generating new profit.
In addition, according to the present invention, the recycling of waste can be promoted due to the advantages of excellent physical properties and low manufacturing cost compared to existing wood, metal materials and synthetic resin materials.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing waste plastic pellets,

The present invention relates to a method for producing a waste synthetic resin pellet, and more particularly, to a method for producing a waste synthetic resin pellet, in which not only a combustible waste but also a non-combustible waste can be recycled as a raw material.

(W) of PET bottles, plastic bags, and synthetic fibers, which were previously incinerated or buried, were formed into pellets to improve transportability, storage stability, and combustion stability, so that coal calories (4,000-5,000 kcal / kg) Solid Fuel (SRF) was developed at a similar level.

The process of manufacturing such a solid fuel will be described below.

A preparatory step for collecting the combustible thermoplastic resin as the waste synthetic resin is performed.

After the preparation step, a crushing and crushing step of cutting the waste synthetic resin into pieces is performed.

After the crushing and grinding steps, an extrusion step is performed in which the pieces are heated to melt and extruded through a die into a noodle-shaped strand.

After the extrusion step, a cutting step is performed in which the strands are cut and molded into waste synthetic resin pellets.

The government is encouraging the use of waste synthetic resin pellets manufactured as such for solid fuel such as thermal power plants and boilers. However, such solid fuels are becoming a main cause of air pollution by discharging a large amount of pollutants during combustion, It is not utilized properly. Therefore, there is a problem that the thermoplastic resin is incinerated or buried without being recycled as a solid fuel, thereby causing environmental problems. Therefore, recently, a method of recycling the waste synthetic resin pellets as structural products such as pipes and blocks has been proposed.

However, the waste synthetic resin pellets produced by the background art have the following problems.

Firstly, a method of molding into a structural product such as a pipe or a block has been proposed without using it as a solid fuel, but physical properties such as tensile strength, compressive strength and bending strength can not be used for structural purposes.

Secondly, the above-mentioned prior art is only applicable to combustible wastes, and non-combustible wastes can not be recycled. For example, since thermosetting resin having heat resistance, light oil and natural fibers (hemp, silk, etc.) or woven garment is not melted, molding with waste synthetic resin pellets is impossible.

Korean Patent Laid-Open Publication No. 10-1998-078426

The method for producing a waste synthetic resin pellet according to the present invention aims to solve the following problems.

First, a method of molding a waste pellet into a structural product such as a pipe or a block has been proposed without using solid fuel, but the physical properties such as tensile strength, compressive strength and bending strength can not be used for structural purposes .

Secondly, the above-mentioned prior art is only applicable to combustible wastes, and non-combustible wastes can not be recycled. For example, thermosetting resins with heat resistance, optical fibers, natural fibers (hemp, silk, etc.), or woven garment garments are not melted, and thus the problem of being unable to be molded into waste synthetic resin pellets is solved.

A method for producing waste synthetic resin pellets for solving the above problems is as follows.

A crushing step of crushing flammable waste to produce a primary slice; a crushing step of cutting the primary slice and filtering the primary slice after screening to form a secondary slice; and after the crushing step, Mixing the non-combustible waste material with the non-combustible waste material to form a mixture; and after the mixing step, the mixture is heated while stirring to produce a melt; and after the melting step, And a cutting step of cutting the strands to make waste synthetic resin pellets after the extruding step.

Further, in the mixing step, the non-combustible waste may be selected from among natural fibers, optical fibers, and thermosetting resins.

It is also characterized in that it is a pulverization product which is generated when the natural fiber or woven garment is polished with a friction material.

Further, the pulverized material is formed by spreading and fixing the waste garment on a flat plate and then rubbing the garment with the friction material, and the friction material is formed with projections on the lower surface and is rotated to rub against the waste garment.

The thermosetting resin is subjected to crushing and crushing steps. The optical fiber is subjected to a crushing step and is sized so as not to block the dice.

Further, the combustible waste is 50 to 90% of the total weight, and the non-combustible waste is 10 to 50% of the total weight.

The method for producing a waste synthetic resin pellet by the above-mentioned solution has the following effects.

First, it combines physical properties such as heat resistance, abrasion resistance, and durability of incombustible waste and non-combustible waste, so that it can be recycled into various structural products.

Second, by recycling incombustible non-combustible wastes, it is possible not only to prevent environmental pollution, but also to create new profits.

Third, according to the present invention, the recycling of waste can be promoted due to the advantages of excellent physical properties and low manufacturing cost compared with existing wood, metal materials and synthetic resin materials.

1 is a block diagram showing a first embodiment of a method for producing a waste synthetic resin pellet according to the present invention.
Fig. 2 is an exemplary view showing the crushing step of the first embodiment of the method for producing waste synthetic resin pellets according to the present invention. Fig.
3 is an exemplary view showing the pulverization step of the first embodiment of the method for producing waste synthetic resin pellets according to the present invention.
4 is an exemplary view showing the polishing step of the first embodiment of the method for producing the waste synthetic resin pellets according to the present invention.
5 is an exemplary view showing a heating step, an extrusion step and a cutting step of the first embodiment of the method for producing the waste synthetic resin pellet according to the present invention.
6 is a block diagram showing a second embodiment of a method for producing a waste synthetic resin pellet according to the present invention.
Fig. 7 is an article manufactured using waste synthetic resin pellets manufactured by the present invention, wherein (a) is a parking block, (b) is a bench, and (c) is a piping.

The present invention relates to a technique for producing a waste synthetic resin pellet (P) having improved physical properties by mixing combustible waste (W) and non-combustible waste, which is capable of molding a structural product and recyclable non-combustible waste as well as combustible waste .

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(Embodiment 1)

FIG. 1 is a block diagram showing a first embodiment of a method for producing a waste synthetic resin pellet according to the present invention, FIG. 2 is an illustration showing a crushing step of a first embodiment of a method for producing a waste synthetic resin pellet according to the present invention, Fig. 3 is an illustration showing a grinding step of a first embodiment of a method for producing a waste synthetic resin pellet according to the present invention, and Fig. 4 is a view showing an example of a grinding step of a first embodiment of a method for producing waste synthetic resin pellets according to the present invention FIG. 5 is an exemplary view showing a heating step, an extrusion step and a cutting step of the first embodiment of the method for producing a waste synthetic resin pellet according to the present invention. The first embodiment of the present invention will be described as follows.

A crushing step of crushing the combustible waste W to produce a primary piece G is performed and after the crushing step the primary piece G is cut and filtered with a screen to form a secondary piece K A pulverizing step is carried out. Further, after the pulverizing step, a mixing step of mixing the secondary piece (K) and the non-combustible waste to form a mixture (M) is performed, and after the mixing step, the mixture (M) A melting step is carried out to make the melt (H). Further, after the melting step, an extrusion step is performed in which the melt (H) is extruded into a dice (330) to form a noodle-like strand (N), and after the extrusion step, the strand A cutting step of making waste synthetic resin pellets P is performed.

Each of the above steps will be described in more detail as follows.

1. Shredding step

In the crushing step, the combustible waste W is compressed and torn or destroyed. The soft material such as a PET bottle is compressed and torn to divide, and the rigid material such as toys is compressed and destroyed. The division of the combustible waste through the crushing step is referred to as a primary piece in the present invention.

The combustible waste W is a thermoplastic resin waste made of PET (polyethylene phthalate), PVC (polyvinyl chloride), PE (polyethylene), PP (polypropylene), nylon, vinyl, It is also possible to use clothing made of household goods such as toys or toys, stationery, bags and film, and synthetic fibers.

The crushing apparatus 100 shown in FIG. 2 is used for crushing the combustible waste W, and includes a rotating shaft 110 which is disposed parallel to both sides of the rotating shaft 110. The rotating shaft 110 is provided with a disk- (120) are fixedly formed. The rotating body 120 of the rotating shaft 110 provided at one side is interposed between the rotating body 120 of the rotating shaft 110 provided at the other side so that when the combustible waste W is inserted into the rotating body 120, It is torn or destroyed and becomes the first piece (G) and falls downward.

In the case of the waste garment as the combustible waste W, since it is difficult to be crushed through the crusher 100, it is cut into a primary piece G through a separate cutting device. The cutting device is constituted by a blade which reciprocates up and down. The blade can be cut into a plurality of primary pieces (G) by passing the blade.

The size of the primary piece G is, for example, 30 to 50 mm 2.

2. Grinding step

In the pulverizing step, the primary piece (G) is finely cut so that it can be easily melted in the melting step. The grinding apparatus 200 shown in FIG. 3 may be used for the grinding step.

The grinding apparatus 200 is configured to rotate the rotary shaft 210. A plurality of rotary blades 220 are attached to the rotary shaft 210. A support bracket 230 is provided to correspond to the rotary shaft 210, And a fixing blade 240 disposed between the rotating blades 220 is fixed to the supporting bracket 230. And is configured to pass through the rotating blade 220 and the stationary blade 240 in contact with each other, thereby generating a shearing load. Therefore, when the primary piece G is supplied between the rotary shaft 210 and the support bracket 230, the secondary piece K, which is cut between the rotary blades 220 and the stationary blades 240, . In this case, the size of the secondary piece K is, for example, 2 to 20 mm 2 when the size of the primary piece G is 30 to 50 mm 2.

In addition, a screen is installed under the grinding apparatus 200 so that only the size of the grinding apparatus 200 is passed. Further, the grinding apparatus 200 is further supplied with the rotating blades 220 and the stationary blades 240 by the rotation of the rotating shaft 210, .

3. Mixing step

In the mixing step, the secondary piece K and the non-combustible waste are mixed. The non-combustible waste is a material which does not melt, and is selected from among natural fibers, optical fibers and thermosetting resins.

For example, when the non-combustible waste is a thermosetting resin, it is a waste having mainly a shape such as a bottle, a stationary or a toy, so that the crushing step and the crushing step can be manufactured in the same manner. At this time, it is preferable that the size is 2 to 20 mm < 2 > like the first piece (G). Therefore, it is possible to prevent the phenomenon of closing the dies 330, which will be described later.

When the non-combustible waste is an optical fiber, it is preferable to cut it to a length of 3 to 5 mm. Therefore, it is possible to prevent the phenomenon of closing the dies 330, which will be described later.

When the non-combustible waste is a waste garment (C) made of natural fibers such as cotton, hemp or silk, the pulverized product (C) generated by grinding the waste garment (C) with the friction material F) are mixed together with the secondary piece (K). The secondary piece K is swollen like a cotton and can be mixed evenly in a melting step to be described later. Therefore, in the case of molding the waste synthetic resin pellets P, the pulverized product F is uniformly distributed as a fiber structure therein, so that the physical properties can be improved when the molded product is molded from the waste synthetic resin pellets P.

As an example of forming the pulverized product F, as shown in FIG. 4, the waste garment C is spread and fixed on a flat plate T and then frictioned with the friction material 500. The friction material 500 is formed with projections 520 on the lower surface thereof and is rotated to frictionally contact the waste clothes C, thereby obtaining the pulverized material F. At this time, it is a matter of course that the waste garment C is worn out and disappears.

At this time, the combustible waste is made to be 50 to 90% of the total weight, and the non-combustible waste is made 10 to 50% of the total weight. The non-combustible waste is to be provided in a weight ratio of 1: 1: 1 when all natural fibers, optical fibers and thermosetting resins are used. Therefore, the tensile strength can be improved by the natural fibers, the wear resistance can be improved by the optical fiber, and the heat resistance can be improved by the thermosetting resin.

4. Melting step

As the step of melting and mixing the combustible waste W and the non-combustible waste mixed in the mixing step, the extrusion apparatus 300 is used as shown in Fig. The extrusion apparatus 300 includes a housing 310 having an opening 340 formed upward and a screw shaft 320 accommodated in the housing 310 so as to be longitudinally reciprocated. An electric heater is accommodated in the screw shaft 320 to generate heat. A hole 313 through which the molten material is discharged is formed in the front side (the side where the molten material is discharged) of the housing 310.

Accordingly, when the combustible waste W mixed with the open mouth 340 and the non-combustible waste are injected after the screw shaft 320 is heated to generate heat, the molten combustible material is stirred while being molten. Then, it is discharged forward through the hole 313.

At this time, the heating temperature of the heater is set to 90 to 300 ° C so that the raw material is semi-melted and the pellet can be formed immediately when the strand (N) passing through the die (330) is cut. If it is completely melted at 350 to 500 ° C, it will not be molded into the strand N when it passes through the die 330, but will flow down and can not be formed into a pellet shape.

5. Extrusion step

A die 330 is attached to the front surface of the extrusion apparatus 300. A hole 335 corresponding to the hole 313 of the housing 310 is formed through the die 330. The molten material H having passed through the holes 313 of the housing 310 is discharged to the noodle-like strand N while passing through the holes 335 of the dies 330. At this time, the thickness of the strand (N) forms the diameter of the hole (335) to be 3 to 10 mm in diameter.

6. Cutting step

The front end of the screw shaft 320 in the extrusion apparatus 300 passes through the housing 310 and passes through the dies 330. In this case, . Then, the blade 410 is fixed to the front end portion so as to be brought into close contact with the front surface of the die 330. Accordingly, the screw shaft 320 may be rotated so that the blade 410 cuts the strand N to form a pellet shape. At this time, the molded waste plastic pellets P have a length of 3 to 15 mm.

At this time, depending on the material, the melt H may be completely melted at a temperature of 90 to 300 캜 and flow down to the holes 335 of the die 330. In order to prevent such a phenomenon, a channel 337 (flow path) is formed in the die 330 so that the coolant flows into the die 330 after being circulated. Accordingly, the die 330 is cooled to improve the viscosity of the melt H, so that the intact strand N is formed. Therefore, the waste synthetic resin pellets P can be formed through the blade 410.

The waste synthetic resin pellets P thus formed are extruded while being stirred with the non-combustible waste while the combustible waste W is being melted and solidified into the waste synthetic resin pellets P so that the combustible waste W serves as an adhesive, And serves to bind the soft waste. In addition, the pulverized product (F) becomes a fiber structure and is uniformly mixed in the inside of the waste synthetic resin pellet (P), and the pulverized product of the optical fiber and the thermosetting resin is also mixed.

(Second Embodiment)

FIG. 6 is a block diagram showing a second embodiment of a method for producing a waste synthetic resin pellet according to the present invention, and a second embodiment of the present invention will be described as follows.

A crushing step of crushing the combustible waste W to produce a primary piece G is performed and after the crushing step the primary piece G is cut and filtered with a screen to form a secondary piece K A pulverizing step is carried out. Further, after the pulverizing step, a mixing step of mixing the secondary piece (K) and the non-combustible waste to form a mixture (M) is performed, and after the mixing step, the mixture (M) A melting step is carried out to make the melt (H). Further, after the melting step, a compression step of molding the pellets by injecting the melt (H) into the inside of the mold is performed.

The crushing step, crushing step and mixing step are the same as those in the first embodiment. And the melting step uses a general stirrer in which the mixture (M) is stirred while heating. Then, the molten metal is filled in the mold and then solidified. Since the upper mold and the lower mold are separated from each other, molding of the pellet is completed. The pellet is, for example, 2 to 50 mm in diameter and 3 to 15 mm in length.

Alternatively, the melting step is performed by mixing the mixture (M) into a container (container) equipped with a heater and melting the mixture while stirring. The stirrer at this time can be a general one that rotates by driving the motor.

When the waste synthetic resin pellets P according to each of the above embodiments are melted and then molded into a mold, a parking block may be manufactured as shown in FIG. 7A, or a bench as shown in FIG. 7B may be formed. In the case of the bench, a plurality of bars are formed and then combined. Then, it can be formed into a pipe as in (c).

According to the present invention, since the combustible waste W is melted and the physical properties such as heat resistance, abrasion resistance, and durability of the non-combustible waste are combined, it can be recycled into various structural products.

In particular, there is an advantage of not only preventing environmental pollution by recycling non-combustible non-combustible wastes but also creating new profits.

In addition, according to the present invention, there is an advantage in that recycling of waste can be promoted due to the advantages of excellent physical properties and low manufacturing cost compared with existing wood, metal materials and synthetic resin materials.

(Test Example)

(Example 1)

According to the manufacturing method of the present invention, a round bar having a diameter of 30 mm and a length of 200 mm was produced by melting waste synthetic resin pellets (P) mixed with an incombustible waste, optical fiber, natural fiber and thermosetting resin into flammable waste (W).

(Comparative Example 1)

The waste synthetic resin pellets (P) mixed only with the thermosetting resin as the non-combustible waste in the flammable waste (W) were melted to prepare a round bar having a diameter of 30 mm and a length of 200 mm.

(Comparative Example 2)

A round bar having a diameter of 30 mm and a length of 200 mm was produced from PVC (polyvinyl chloride) as a raw material.

(Comparative Example 3)

A round bar having a diameter of 30 mm and a length of 200 mm was produced as a wood.

The following results were obtained by physical testing of the above examples and comparative examples.

The tensile strength
Compressive strength
Bending strength
Mohs hardness
Example

250 kg / ㎠
300 kg / ㎠
150 kg / ㎠
5
Comparative Example 1

150 kg / ㎠
180 kg / ㎠
85 kg / ㎠
3
Comparative Example 2

120 kg / ㎠
83 kg / ㎠
62 kg / ㎠
3
Comparative Example 3

265 kg / ㎠
243 kg / ㎠
55 kg / ㎠
2

As can be seen from the above table, the tensile strength of the round bar according to the examples was not different from that of the wood. This point has been confirmed that natural fibers are mixed as non-combustible waste. It can be seen that the compressive strength and the bending strength are significantly higher than those of the comparative examples. In addition, since the optical fiber and the thermosetting resin are mixed as the non-combustible waste in the embodiment, the Mohs hardness value is larger than that of the comparative examples. This proved that the wear resistance was improved due to the optical fiber and the thermosetting resin.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Therefore, it is to be understood that the embodiments disclosed herein are not for purposes of limiting the technical idea of the present invention, but are intended to be illustrative, and thus the scope of the technical idea of the present invention is not limited by these embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: crushing device 110: rotating shaft
120: rotating body 200: crushing device
210: rotating shaft 220: rotating blade
230: support bracket 240: stationary blade
300: extrusion device 310: housing
313: hole 320: screw shaft
330: Dice 335: hole
340: opening portion 410: blade
500: friction material 510: block
520: projection P: waste synthetic resin pellet
F: Crushed product W: Flammable waste
G: First carving K: Second carving
M: mixture H: melt
C: Lung clothing

Claims (7)

delete delete delete A crushing step of crushing the combustible waste W to produce a primary piece G,
After the crushing step, the primary piece (G) is cut and filtered through a screen to produce a secondary piece (K)
Mixing the secondary piece (K) and the non-combustible waste to form a mixture (M) after the crushing step;
A melting step of making the melt (H) by stirring while heating the mixture (M) after the mixing step;
An extrusion step of extruding the melt (H) into a die (330) to form a noodle-like strand (N) after the melting step;
Cutting the strand (N) to produce waste synthetic resin pellets (P) after the extruding step,
In the mixing step, the non-flammable waste is a pulverized product (F) generated by rubbing the garment (C) woven with natural fibers on the flat plate (T) after being fixed and then rubbing with the friction material (500)
The friction material 500 is formed with a protrusion 520 at a lower surface thereof and rotates to frictionally contact the waste cloth C ,
The die 330 has a passage 337 formed therein and is capable of circulating the cooling water,
Wherein the viscosity of the melt (H) is increased by circulating cooling water in the flow path (337) when the viscosity of the melt (H) is lowered in the extrusion step . delete delete delete

Images