JP2586626Y2 - Waste plastic material processing equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tray for a packaging container formed of, for example, a foamable or non-foamable plastic,
Plastic waste materials such as lunch boxes, cushioning materials, injection molded products, blow molded products, etc.
That. )).

[0002]

2. Description of the Related Art Conventionally, most waste plastics have been incinerated or landfilled.
Other methods for volume reduction or regeneration treatment include the following. For example, a method of heating and reducing the volume with hot air in a hot blast furnace (Japanese Patent Publication No. 63-36924), a method of heat-melting with high-temperature heated steam and reducing and solidifying the volume (JP-A-63-353)
No. 09), a method in which waste plastic is directly poured into heated waste tempura oil, softened and reduced in volume, and then put into a mold for cooling treatment (Japanese Utility Model Application Laid-Open No. 63-175138).
A method of softening and compressing and solidifying with a screw and a cylinder through which a heating gas has passed (Japanese Patent Application Laid-Open No. Hei 1-182012), and a method of discharging the plastic that has flowed out of the furnace by heating and flowing out of the furnace with a screw and cooling and solidifying ( JP 1
JP-A-209106), a method of compressing and reducing the volume with a heated rolling roller (JP-A-1-288409), and a method of putting waste plastic inside a heating box and pressing it with a hot-compression plate (JP-A-1-288410). Gazette). In addition, as a method of continuously softening and reducing the volume with heated food oil, the applicant of the present application inserts waste plastic into an edible waste oil tank, and rotates the intermittently-rotating rotary provided in this tank. A waste plastic that has been forcibly immersed and softened by a blade and softened and reduced in volume has been proposed (JP-A-3-305550). And this rotating blade rotates 90 degrees in 15 seconds, for example,
Stops for 20 seconds and uses 180 liters of heated oil, 30-40 kg per hour
Was able to treat the waste plastic.

[0003]

However, in the prior art, there were problems such as safety of the heating method, poor work efficiency, large-scale equipment, and high manufacturing cost. In addition, the storage of the waste plastic container alone has many problems, such as the raw food juice attached to the waste plastic container generating a putrefactive odor in a short period of time, causing trouble to the surroundings. In the case of a treatment method in which the waste plastic container is heated and reduced by hot air or the like, a lot of putrid odor is generated by further heating, and this odor treatment is extremely difficult. Further, in many conventional waste plastic treatment methods, substantially a single resin composition and similar forms (foaming, foaming,
In most cases, the treatment cannot be performed unless the composition is limited to non-foaming. Further, in the apparatus disclosed in JP-A-3-305550, in which the volume is reduced in the heating oil by intermittently rotating rotating blades, the processing speed is slow, and the heating oil contacts the waste plastic for a long time. If used, a part of the waste plastic will dissolve in the oil, which will increase the viscosity of the oil and further reduce the processing efficiency. Sometimes it was shorter.

Accordingly, an object of the present invention is to provide a processing apparatus for a waste plastic plastic member capable of improving the processing efficiency, slowing down the rate of increase in oil viscosity, and preventing overheating of the heating means. To provide.

[0005]

SUMMARY OF THE INVENTION The features of the present invention are as follows: a screw conveyor for charging, a screw conveyor for discharging, an oil tank having a heating means, an oil cooling means, an oil reheating means, and a material dissolved in oil. It consists of means for discarding plastic components, and the cylinder of the above-mentioned screw conveyor for charging is a tapered type with an upper end opening, and the screw of this conveyor is entirely tapered corresponding to the inner surface shape of this cylinder. The respective cylinders of the input screw conveyor and the output screw conveyor are communicated at a lower end portion, and the oil tank heats oil to a predetermined temperature to feed the input screw conveyor. The oil cooling means communicates with the discharge conveyor, and A) to cool the oil flowing from the oil to a predetermined temperature or lower, and the oil reheating means reheats the oil flowing from the oil cooling means and returns the heated oil to the charging screw conveyor. The means for discarding the plastic dissolved in the oil is to discard the plastic deposited by the oil cooling means.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the apparatus for treating plastic waste plastic according to the present invention is roughly divided into a screw conveyor 1 for charging and a screw conveyor 2 for discharging.
An oil tank 3 having a heating means, a cooling tank 4 serving as an oil cooling means, an oil reheating means 5 and a means 6 for discarding the plastic dissolved in the oil. It is provided in.

Therefore, a specific structure of each of the above-described components will be described.

First, the cylinder 11 of the screw conveyor 1 for charging is a hopper having an upper end opening, and waste plastic can be charged through the opening of the cylinder.
The screw 12 of the conveyor is large at the top corresponding to the inner surface shape of the cylinder, and is gradually reduced toward the bottom so as to be entirely tapered. The proximal end of the drive shaft 13 of the screw is connected to a drive motor 14 and is driven to rotate by the drive motor. The motor is held by a holding frame (not shown) extending from the machine frame 7. It is cantilevered. Further, an oil heating means 15 is provided on the bottom surface of the cylinder 11 of the feeding screw conveyor 1.
Is provided. As shown in FIG. 2, a plurality of projections (guide bars) 16... That do not hinder the rotation of the screw blades of this conveyor are provided on the inner wall of the cylinder 11 of the screwing screw conveyor 1 by 90 degrees. Projecting with an angular displacement of

Next, the structure of the screw conveyor 2 for unloading is such that both the cylinder 21 and the screw 22 are tapered at the front end, and the base end of the drive shaft 23 of the screw is connected to a drive motor 24. The motor is rotatably driven, and is a cantilever supported by a holding frame (not shown) extending from the machine frame 7. A seal 25 is provided between the motor and the drive shaft 23 to hermetically seal the motor. Further, a discharge pipe 26 is provided at the tip of the cylinder 21 of the screw conveyor 2 for unloading. The discharge pipe faces into a mold 8 located on a table surface on the left side of the machine frame 7. In order to promote the separation of oil mixed in the softened resin, the discharge screw 22 and the front end of the cylinder 21 are tapered, and the pitch of the blades of the screw is reduced.

Cylinder 1 of screw conveyor 1 for charging
1 and the cylinder 21 of the discharge screw conveyor 2
Each lower end communicates with each other to form a V-shape as a whole.

The oil tank 3 is held by the machine frame 7 and includes heating means 31 for heating vegetable or animal oil, for example, waste oil for food, to a predetermined temperature. The oil heated by the heating means is supplied from the oil supply pipe 33 by the pump 32 to the cylinder 1 of the screwing screw conveyor 1.
1 are supplied.

The structure of the oil cooling means 4 is as follows. An opening 27 is provided above the cylinder 21 of the discharge conveyor 2, a net for separating resin oil is stretched, and an oil reservoir is provided around the opening. The oil reservoir and the cooling tank 4 are communicated with each other through a communication pipe 28. The oil flowing from the conveyor is cooled to a predetermined temperature or less. The plastic component dissolved in the oil to be deposited is deposited. The plastic component deposited by the cooling means is filtered by the disposal means 6 and discarded.

The oil reheating means 5 includes an oil cooling tank 4
Is re-heated and returned to the cylinder 11 of the feeding screw conveyor 1.

Next, the operation of the present invention will be described.

The waste plastic is charged into the cylinder 11 of the screw conveyor 1 for charging. Note that even if a small piece of thermosetting resin, a piece of paper, or a piece of metal is mixed, the size may be small enough to be sealed in the waste plastic. At this time, the oil heated by the heating means 31 in the oil tank 3 is supplied to the pipe 3 by the pump 32 in the cylinder 11 and the cylinder 21 of the discharge screw conveyor 2.
3 already supplied. The temperature of the oil is about 130 to 230 degrees Celsius. If the temperature is lower than 130 degrees Celsius, the softening of the waste plastic is insufficient, and if the temperature exceeds 230 degrees, the viscosity of the waste plastic is extremely reduced. About 180 degrees. Further, it is desirable that the supply amount of the oil slightly exceeds the installation level of the heating means 15.

When the waste plastic is put into the screw conveyor 1 when the waste plastic is softened, the internal space such as the space between the moldings due to the foaming or the molded shape is large and the apparent density is low. Screw 1 in cylinder 11
Rotate with 2. That is, there is a case where the wheel spins. In such a case, the spinning phenomenon is prevented by the projections 16,.

The waste plastic charged into the cylinder 11 is forcibly transferred by the screw 12 into the cylinder 21 of the discharge screw conveyor 2, and further rises in the cylinder 21 of the discharge screw conveyor 2 by the screw 22. It is discharged from the discharge pipe 26 into the mold 7.

The oil that rises together with the waste plastic in the cylinder 21 of the discharge screw conveyor 2 is introduced into the cooling tank 4 and cooled to a predetermined temperature, for example, 80 degrees Celsius or less, in the cooling tank. Therefore, the plastic component dissolved in the oil is deposited, and the deposited plastic component is filtered and then discarded in the disposal unit 6. The filtered oil is heated again by the oil reheating means 5 and then returned to the cylinder 11 of the screw conveyor 1 for charging. When the temperature of the oil in the cylinder 11 of the screw conveyor 1 for charging decreases, the oil is heated by the heating means 15. As the heating means, high frequency heating, band heater heating, casting heater heating, or the like can be appropriately selected and used.

The driving motor 14 for the input screw conveyor 1 and the driving motor 24 for the discharging screw conveyor 2
By changing the rotation ratio, the drive efficiency can be prevented from fluctuating due to the difference between the apparent volume and the actual volume of the waste plastic, and can be properly maintained. Extremely wide.

According to the experimental example, the amount of oil required to treat 30 to 40 kg of waste plastic per hour as in the past is sufficient if 100 liters heated to 160 degrees Celsius is used. You also need less. further,
If edible waste oil is used as the oil, the waste oil which is conventionally difficult to treat can be treated at the same time. The consumption of such waste oil is about 20 to 30% by weight based on the waste plastic. In addition, the oil that decreases due to operation
The oil level is detected by an oil level sensor installed on the cylinder of the screw conveyor for charging, and the oil is replenished as appropriate. The volume-reduced material discharged to the mold 8 can be used as a raw material for a fuel or a plastic cracked oil in addition to the volume-reclaimed landfill. In this case, the density of the volume-reduced material is substantially uniform, As a result, the same shape and size can be obtained, so that it can be used efficiently.

FIG. 3 shows another embodiment. In this embodiment, an oil tank 3a is used instead of the oil tank 3, and a cylinder of the screw conveyor 1 for charging is provided in the oil tank. 11 and a cylinder 21 of the screw conveyor 2 for discharging, and a plurality of openings 11a are opened on the lower surface of the cylinder 11 of the screw conveyor 1 for charging, and a net is stretched. Oil in the cylinder 11
The oil freely flows in and out, and is heated by the heating means 31a. Also in this device, the cooling means 41 and the reheating means 51 are provided, and the other configuration is substantially the same as the configuration of the previous embodiment.
The same reference numerals are given. The operation is also the same as in the previous embodiment.

[0023]

[Effect of the Invention] In the present invention, the processing efficiency of waste plastic is higher than that of the conventional plastic, and the plastic dissolved from the waste plastic is deposited by cooling means, discarded, and reheated. Oil viscosity is prevented from increasing as much as possible, and overheating of the conventional heater can be prevented. Further, since there is almost no limitation on the installation place due to the problem of odor, it can be installed in a place where dirty waste plastic containers are generated, for example, in a market. Therefore, it is possible to greatly reduce the transportation cost of the waste plastic. In addition, the processed reduced volume contains food debris inside,
Since it contains waste oil, etc., if this is crushed and processed into small particles and mixed into the soil, food debris and oil inside will be decomposed, and space will be generated in the waste plastic small particles, Since air can be retained, it can be used as a good soil conditioner. Furthermore, since the rotation ratio of the input and output screws can be set freely, it is possible to prevent the working efficiency from being deteriorated due to the apparent density of the input waste plastic.

[Brief description of the drawings]

FIG. 1 is a sectional view.

FIG. 2 is a plan view of a cylinder of a screw conveyor for charging;

FIG. 3 is a sectional view showing another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Input screw conveyor 11 Cylinder 12 Screw 14 Rotation drive means (drive motor) 2 Discharge screw conveyor 21 Cylinder 22 Screw 24 Rotation drive means (drive motor) 3 Oil tank 31 Heating means 4 Oil cooling means (cooling tank) 5 Oil Reheating means 6 Means for discarding plastic dissolved in oil 3a Oil tank 31a Heating means

Claims (4)

(57) [Scope of request for utility model registration] 1. A processing apparatus for charging a waste plastic member into heated oil for processing, comprising: a charging screw conveyor, a discharging screw conveyor, an oil tank having a heating means, an oil cooling means, A reheating means and a means for discarding the plastic component dissolved in the oil are provided.The cylinder of the screw feeding conveyor is a tapered type having an upper end opening, and the screw of the conveyor is
The entirety of the cylinder is formed in a tapered shape corresponding to the inner surface shape of the cylinder, and the respective cylinders of the input screw conveyor and the output screw conveyor communicate with each other at a lower end portion. Heating the oil to a predetermined temperature and supplying the oil to the charging screw conveyor. The oil cooling means communicates with the discharging conveyor to cool the oil flowing from the conveyor to a predetermined temperature or less. Wherein the oil reheating means reheats the oil flowing from the oil cooling means and returns the heated oil to the charging screw conveyor.The means for discarding the plastic dissolved in the oil is Wherein the plastic component deposited by the oil cooling means is discarded. Processing apparatus 棄可 plastic plastic member. 2. An apparatus according to claim 1, wherein an oil heating means is provided in a cylinder of the charging screw conveyor. 3. The waste plastic plastic member processing apparatus according to claim 1, wherein a projection having a shape that does not hinder the rotation of the conveyor is provided on an inner wall of a cylinder of the charging screw conveyor. 4. The waste plastic plastic member processing apparatus according to claim 1, wherein the rotation driving means of the charging screw conveyor and the discharging screw conveyor can change the rotation ratio mutually.