JPH05147036A - Method and apparatus for reclaiming waste plastic - Google Patents

Abstract

PURPOSE:To provide reclaiming method of waste plastic so as to generate no peeling phenomenon in a molded product obtained from regenerated plastic. CONSTITUTION:Ground paper or wood is mixed with ground waste plastic in a predetermined mixing ratio. The obtained mixture is kneaded and plasticized under heating and the kneaded plasticized matter is subjected to extrusion molding using a nozzle. Ground paper or wood is interposed between various plastic monomers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for recycling waste plastic for recycling waste plastic.

[0002]

2. Description of the Related Art Conventionally, as a method for recycling waste plastics, mainly thermoplastic waste plastics such as polypropylene, polyethylene, and vinyl chloride, for example, Japanese Patent Publication No. 57-1.
As disclosed in Japanese Patent No. 4293, a waste solution mainly composed of poly-α-olefin plastics such as polypropylene and polyethylene is dissolved in an aromatic organic solvent at a temperature of 80 ° C to 135 ° C to obtain a plastic solution and water at 70 ° C. ~ 100
After the inorganic substance contained in the plastic waste material is occluded in the high molecular weight portion of the plastic by contacting at 0 ° C to physically separate the solid phase portion and the liquid phase portion containing the inorganic substance partially phase-separated, , The remaining liquid phase is 70
There has been proposed a method for treating a plastic waste material in which a plastic monomer is precipitated by cooling to below ℃. Also known is a recycling method in which thermoplastics such as polypropylene, polyethylene and vinyl chloride are heated to be plasticized and poured into a predetermined mold by a low pressure method or a high pressure method.

[0003]

In the method for treating waste plastic in which the plastic monomer is deposited, there is a problem that the treatment apparatus becomes relatively large and the waste plastic cannot be entirely reused. On the other hand, in the method in which the plasticized waste plastic is poured into a predetermined mold and molded, the waste plastic can be reused entirely, but the molded product has a problem that a peeling phenomenon occurs and the strength is significantly reduced. This is because the waste plastic is mixed with various plastic materials such as polypropylene, polyethylene and vinyl chloride, and the peeling occurs due to a chemical reaction by these foreign substances.

By the way, in recent years, many trees in the forest have been cut down, and there is a fear of deforestation, and it has been attempted to reuse the used wood, for example, as a raw material for paper.

It is an object of the present invention to solve the above problems and provide a method and apparatus for recycling waste plastic in which a peeling phenomenon does not occur in a molded product in which waste plastic is recycled.

[0006]

According to a first aspect of the present invention, there is provided a method for recycling a waste plastic material, which comprises mixing crushed waste plastic with crushed paper or wood, and then kneading the mixture while heating to plasticize the mixture. The kneaded plasticized product is extruded and molded, and then rolled and molded.

According to a second aspect of the present invention, in a waste plastic recycling apparatus, a cylinder having one side connected to a hopper, a nozzle provided on the other side of the cylinder, and a cylinder provided in the cylinder in the axial direction of the cylinder. It is provided with a rotary screw provided, a heater provided on the cylinder, and a rolling device having a starting end provided on the nozzle side.

[0008]

According to the present invention, the crushed waste plastic is heated to be plasticized, and the plastic which is not peeled can be regenerated by the interposition of the kneading plasticized product with the crushed paper or wood.

Further, in claim 2, when a mixture of crushed waste plastic, paper or wood is fed into a cylinder, the waste plastic is heated by a heater in the cylinder to be in a molten state, The above-mentioned paper or wood intervenes in. Then, it is sent out to the nozzle side by the rotating screw and extruded, and the extruded molded product is processed by the rolling roller.

[0010]

An embodiment of the present invention will be described with reference to the accompanying drawings. A hopper 2 is provided on an upper portion of one side of the base frame 1, and a horizontal cylinder 3 is connected to a lower portion (not shown) of the hopper 2. Inside the cylinder 3, a rotary screw 4 is provided coaxially with the cylinder 3, and a heater 3A is provided. The rotary screw 4 is connected to a motor 5 provided with a speed reducer (not shown) provided on one side of the base frame 1. On the other side of the cylinder 3, a nozzle 6 communicating with the inside of the cylinder 3 and having a throttle ratio of about 1/3 is provided. Further, a plurality of rolling rollers 7 are arranged on the outer side of the nozzle 6 in two steps, and a water-cooling or air-cooling cooling device 8 is provided between the rolling roller 7 and the nozzle 6. There is. Further, on the other side of the rolling roller 7, a cutting device 11 having a motor (not shown) driven cutter 10 for cutting the primary molded product 9 to a predetermined length is provided so that the base frame 1 can be moved back and forth. The cutting device 11 includes a moving device such as a hydraulic cylinder.
The cutters 9 can be moved to a predetermined position by operating the moving device 12 by connecting the cutters 12.

Next, the operation of the above configuration will be described with reference to FIG. Wash the waste plastic with a shower and then dehydrate it. This washed waste plastic is crushed by a crusher. After that, foreign substances such as iron scraps are removed from the crushed waste plastic by a sorting device (not shown) using a magnet or the like. Further, the waste plastic from which foreign substances have been removed such as iron scraps is further crushed into about 5 to 10 mm square (25 to 100 square mm) by a crushing device, and the crushed waste plastic is washed again with water and dehydrated, and thereafter the waste plastic Are stored in a mixing device (not shown). In addition, paper such as corrugated cardboard and office waste is crushed by a crusher to a 10 to 30 mm square (100 to 900 mm).
It is crushed to about square mm) and the crushed papers are stored in the mixing device. Further, wood such as discarded wood is also crushed into about 5 to 10 mm square (25 to 100 square mm) by a crushing device. Thereafter, a sorting device (not shown) is used to remove iron scraps and the like, and the crushed wood is stored in the mixing device. The crushed papers and wood need not be stored in the mixing device together with the crushed waste plastic, and either one may be used.

Then, the mixing device is operated to mix the waste plastic, the paper and the wood. The mixing ratio is 100 parts by weight of waste plastic, 25 to 60 parts by weight of paper 14 and wood 16, preferably 100 parts by weight of waste plastic.
The total amount of the paper 14 and the wood 16 is 30 to 50 parts by weight, and more preferably, the waste plastic is 100 parts by weight, and the paper and the wood 16 are 30 parts by weight.
When the mixed raw materials are stored in the hopper 2, the motor 5 is operated, and the heater 3A is energized, the waste plastic is heated to about 160 ° C to 280 ° C to be in a superplastic melting state, and various plastics are melted. The monomers fuse, and the papers and wood melt and intervene between the various plastic monomers. The raw material thus melted is pressure-fed to the nozzle 6 side as the rotary screw 4 rotates, and is extruded by the nozzle 6 having a circular cross section, for example. The primary molded product extruded as described above is slightly solidified by air cooling or water cooling. Then, the forming raw material having a circular cross section is passed through the rolling roller 7 to have a rectangular cross section, for example. After this, a molded product having a rectangular cross section is cut into a predetermined length by a cutter 10. The secondary molded product thus obtained is provided with, for example, holes and is arranged in a lattice pattern and fixed with screws to produce a pallet or the like for distribution and reuse.

As described above, in the above embodiment, the crushed waste plastic is mixed with the crushed paper or wood at a predetermined mixing ratio, the mixture is kneaded and plasticized while heating, and the kneaded. By extruding the plasticized material with a nozzle, various plastic monomers are fused, and paper and wood are melted and intervened between the various plastic monomers, and various plastic monomers are firmly connected without peeling. As a result, it is possible to obtain a recycled plastic that can secure the strength of wood.

Further, a nozzle 6 is provided on the other side of the cylinder 3 to which the hopper 2 is connected on one side, a rotary screw 4 is provided inside the cylinder 3 coaxially with the cylinder 3, and a heater 3A is provided on the cylinder 3. Further, by providing a rolling roller 7 as a rolling device on the nozzle 6 side, the crushed and plasticized waste plastic is mixed with the crushed papers to manufacture a primary molded product by the nozzle 6, and the primary molded product is further manufactured. The product can be continuously cooled by the cooling device 8 to slightly cure the primary molded product, and can be continuously subjected to the secondary processing by the rolling roller 7, thus enabling mass production.

The present invention is not limited to the above embodiment, and various modifications are possible, for example, the rolling device may be a nozzle type instead of a rolling roller.

[0016]

INDUSTRIAL APPLICABILITY The present invention relates to crushed waste plastic,
Waste plastic that can suppress the occurrence of peeling by mixing crushed paper or wood, kneading the mixture while heating to plasticize it, extruding the kneaded plasticized product, and then rolling and molding Can be provided.

Further, according to the present invention, a cylinder having one side connected to a hopper, a nozzle provided on the other side of the cylinder, a rotary screw provided in the cylinder in the axial direction of the cylinder, Since the heater provided in the cylinder and the rolling device having the starting end provided on the nozzle side are provided, it is possible to continuously form a molded product in which waste plastic is recycled.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a process chart showing an embodiment of the present invention.

[Explanation of symbols]

 2 Hopper 3 Cylinder 3A Heater 4 Rotating screw 6 Nozzle 7 Rolling roller (rolling device)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoteru Sato 591 Shimodate, Kurokawa-mura, Kitakanbara-gun, Niigata Prefecture (72) Settsuko Sato Inbox 591, Kurokawa-mura, Kitakanbara-gun, Niigata Prefecture

Claims (2)

[Claims] 1. A crushed waste plastic is mixed with crushed papers or wood, and the mixture is kneaded while heating to be plasticized, and the kneaded plasticized product is extruded and molded, and then rolled and molded. A method for recycling waste plastic, which is characterized in that 2. A cylinder having one side connected to a hopper, a nozzle provided on the other side of the cylinder, a rotary screw provided in the cylinder in the axial direction of the cylinder, and a cylinder provided on the cylinder. And a rolling device having a starting end provided on the nozzle side, and a recycling device for waste plastic.