JPH03180A - Method for compacting waste expanded polystyrene - Google Patents

Abstract

PURPOSE:To improve the handleability of the waste expanded polystyrene by providing a stage for supplying raw material, a stage for crushing and feeding the waste and a stage for heating and melting the waste. CONSTITUTION:The waste expanded polystyrene is supplied from a supply port 11, water is charged from a supply pipe 10, and the mixture is supplied to two-shaft screw devices 4 and 4'. The mixture is then forced into a narrow clearance C between the pressing bodies 6 and 6 and liners 13, strongly compressed, crushed by the beating action of skew grooves 63, 63', 13a and 13a' caused by rotation, and self-heated. The waste absorbs frictional heat and melts, and the sticked water is evaporated. The waste is then forced through the tapered holes 81,... of the perforated plate 8 by the second twin screw devices 7 and 7', strongly compressed and discharged as a linear solid 9. Consequently, transportation efficiency is increased, and reclamation efficiency is drastically improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a method for solidifying waste Styrofoam, which is widely used as a backing material for packaging materials and packaging containers for seafood and vegetables, into a solid rod. Regarding how to.

(Prior art) In recent years, with the diversification of lifestyles and industrial structures, the quantity and quality of municipal waste and industrial waste have changed significantly, and treatment methods that match the waste quality have become necessary. Ta. In particular, Styrofoam backing materials and food containers have come to be used in large quantities because they are light, have excellent shock absorbing properties, and have excellent heat insulation properties, and as a result, large amounts of Styrofoam waste have been produced. Ta.

(Problem to be solved by the invention) However, even if styrofoam waste is landfilled as it is, it does not rot easily, has a low specific gravity, has a low landfill volume ratio, and requires a large amount of space for landfilling. They are blown away by the wind and drift into rivers and the sea, causing environmental pollution both on land and at sea. Furthermore, when transporting the product, there is a problem of poor transport efficiency.

The present invention was made in view of the above circumstances, and utilizes the low melting point of Styrofoam to crush and compress it into a semi-molten state.
A method of solidifying Styrofoam waste that is then converted into rod-shaped solids to significantly reduce its volume and improve handling, transportation efficiency, and landfill efficiency, as well as contributing to the recovery of polystyrene resources and making it possible to reuse it as solid fuel. is intended to provide.

(Means for Solving the Problems) In order to achieve the above object, the method for solidifying Styrofoam waste of the present invention includes a step of supplying Styrofoam waste and water to a screw device from an input port, and A process of crushing and feeding Styrofoam waste with a screw device, a process of crushing and compressing it with a rotating compressor connected to the screw device, and a process of exothermic melting while suppressing excessive heat generation by inputting water. 2. Extrusion molding the semi-molten waste material into a rod shape from a perforated plate.

A step is taken to drain the remaining water.

(Function) In the method for solidifying styrofoam waste configured as described above, the styrofoam waste inputted from the input port is crushed by the screw device and fed to the primary rotary compressor, and then It is further shredded and compressed by the body. When compressed, Styrofoam waste self-heats and melts due to frictional heat, but the sensible heat of the feed water,
Cooled by endothermic action due to latent heat (e.g. 60~
70° C.), excessive heat generation is suppressed and a semi-molten state is achieved. The semi-molten polystyrene that is sequentially fed by the screw device and the rotary compressor is extruded through the holes of the perforated plate, and then solidified into a rod-shaped solid, which is 1/40 to 1/100 of the starting material. The volume will be reduced to .

(Example) An example will be described with reference to the drawings. In FIGS. 1 to 5, reference numeral 1 indicates the entire solidification device for styrofoam waste, and one end of the styrofoam waste solidification device is There is an inlet port 1 at the top and an outlet port 1 at the other end.
2, and two parallel rotation drive shafts 2 and 3 are arranged from the input port 11 to the output port 12. Spiral blades are formed around the front half of these rotary drive shafts 2.degree. 3 to constitute a twin-screw device 4, 4'. These twin screw devices 4, 4' rotate in opposite directions (from the front to the back in FIG. 1), bite the input raw material, and crush bulky Styrofoam waste in the longitudinal direction. feed. A water supply pipe 10 equipped with an on-off throttle valve V is provided above the input port 11, so that water is supplied from the input port 11 together with waste.

At the terminal end of the twin screw device 4, 4', a diagonal blade 51 is provided.
, 51' are fixedly mounted on the drive shaft 2.3, and forcibly press the crushed waste from the twin-screw device 4° 4' into the next press body 6, 6'. It is designed to work as expected. Following the ring body 5.5', a rotary pressing body 6
, 6' are fixedly connected around the drive shaft 2.3, and include a truncated conical part 61, 61' on the upstream side and a cylindrical part 6 on the downstream side.
It consists of 2°62'. A plurality of diagonal grooves 63, 63' are carved at intervals on the outer circumferential surface of the truncated conical portion 61.61' to the cylindrical portion 62.62'. In addition, the surroundings of the rotary pressing bodies 6, 6' are as follows:
It is surrounded by a liner 13 that can adjust the clearance C, and the inner surface of the liner 13 has diagonal grooves 13a and 13a that intersect with the diagonal grooves 63 and 63'.
' are set in multiple lines. The workpiece forcibly press-fitted into the narrow clearance C between the pressing bodies 6, 6' and the liner 13 is strongly compressed here, and the diagonal grooves 63, 63', 13a, 13a due to rotation. The styrofoam waste is further shredded by the milling action of ', and at the same time it is compressed, generating self-heating, absorbing frictional heat, melting the Styrofoam waste, and converting adhering moisture into hydrothermal water. If sufficient water is not supplied here, the 5th
As shown by the phantom line in the graph, the temperature of the waste rises above its melting point, resulting in a low viscosity melt. When the molten material has such a low viscosity, it flows out from the perforated plate 8 at the end, making it impossible to form it into a rod shape.

In order to prevent this decrease in viscosity, water is added together with the shredding waste.
The compressing body 6 is rotated by the shaft screw device 4, 4',
6' and liner 13, and the temperature of the fluid is 6'.
It is cooled to 0 to 70°C, and the excessive temperature rise is suppressed.

Immediately after the compressing bodies 6, 6', second twin screw devices 7, 7' are installed, in which the compressed state is suddenly released, and a portion of the hot water due to the heat generation is released. 6 steam, which evaporates due to a sudden pressure drop and absorbs latent heat from the surroundings, is discharged from an exhaust hole Q provided directly above. 60~70℃
The fluid, which has been cooled and has an appropriate viscosity, is compressed more strongly by the second twin screw device fi7, 7' through the tapered hole 81 of the perforated plate 8 attached to the end outlet 12. It is extruded and becomes a rod-shaped solid material 9 and is discharged. The remaining cooling water is efficiently discharged from the progressively opening holes 81a at the bottom of the perforated plate 8.

In addition to providing the drainage port for the residual water in the perforated plate 8, it is not excluded that it may be provided in the bottom of the device at the end.

The perforated plate 8 is replaceably attached to the outlet 12, and a twin screw device 7 is mounted on this plate surface as shown in FIG.
, 7', a large number of holes 81..., 81a... are opened concentrically with the rotary drive shafts 2, 3. The extrusion holes 81 of the rod-shaped solid material 9 are not limited to the circular shape shown in the example shown in FIG. 2, but may be appropriately selected depending on the purpose, such as a polygonal shape or a cross shape.

The perforated plate 8 is provided with a thermometer T for detecting the temperature of the polystyrene semi-molten material and controlling the temperature so that the temperature of the semi-molten material is in the range of 45 to 70 DEG C. at the relevant position.

That is, the opening degree of the opening/closing throttle valve (2) of the water supply pipe 10 is adjusted in accordance with the detected temperature signal via a control means in a known manner, and the amount of water supplied is controlled so that melting and solidification are carried out smoothly. It is. In particular, an additional device such as a cooling jacket for cooling the perforated plate 8 may be provided as appropriate in order to solidify the porous plate 8 in a short time.

Solid material 9 is about 1/40 to 1/10 of that of styrofoam
The volume is reduced to 0, and the apparent specific gravity is 0 when expanded polystyrene is used.
．． 001~0.003 is now 0.3~0°32
It is highly dense, with a diameter of 15 to 40++ m and a length of 3
The length is about 5 to 60 mm, which is very advantageous in terms of transportation efficiency and landfill efficiency, and it can also be used as recycled polystyrene and even as fuel.

The device shown in FIG. 6 is of a single-shaft type, and a single-screw device 4 is constructed by forming a spiral blade around the front half of one rotary drive shaft 2 disposed in the device 1. ing. A water supply pipe 10 equipped with an opening/closing throttle valve V is provided above the input port 11 on the starting end side of the screw device, and a wheel 5 equipped with a beveled blade 51 similar to that described above and a rotary member at the terminal end. A pressing body 6 is provided in series. Further, a second screw device is connected to the pressing body 6, and a perforated plate 20 is attached to the end outlet 12. A thermometer T similar to that described above is attached to the perforated plate 2o.The process of forming solid material from Styrofoam waste is the same as in the above embodiment, but this embodiment has a comparatively smaller processing capacity. Suitable for small scale processing plants.

The apparatus shown in FIG. 7 is a single-shaft type apparatus similar to that shown in FIG. 6, but is provided with a tapered portion 40 on the downstream side of the screw device 4 whose diameter gradually decreases in the forward direction. Further, in correspondence with this tapered portion 40, the inner surface of the casing is also tapered forward along this. When the material to be processed reaches this tapered portion 40, it is strongly compressed before reaching the pressing body 6 due to the substantial reduction of the passage space, and crushing, compression, and generation of frictional heat in the pressing body 6 are further promoted. Melting of the Styrofoam will be promoted.

The functions of the components in FIGS. 6 and 7 other than those mentioned above are the same as those of the apparatus shown in FIGS. A detailed explanation will be omitted.

(Effects of the Invention) As described above, according to the method for solidifying Styrofoam waste of the present invention, Styrofoam waste is crushed and compressed while being fed by the screw device and the rotating compressor, and generates friction while self-heating. It absorbs heat and melts, becomes semi-molten due to the cooling effect of water, and is continuously formed into rod-shaped solids from a perforated plate. Therefore, the volume of Styrofoam waste can be significantly reduced to about 1/40 to 1/100, and the handling efficiency, transportation efficiency, and landfill efficiency can be greatly improved. In addition, it contributes to the recovery of polystyrene resources as a recycled raw material, and can also be reused as a solid fuel, which is of great benefit in terms of environmental conservation and industrial economy.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view showing an example of the apparatus employed in the method of the present invention, FIG. 2 is a partially sectional front view of the same, and FIG.
Figure 4 is a cross-sectional view taken along the line m-m, Figure 4 is a front view of the perforated plate, and Figure 5 (
a) is an appropriate temperature control diagram during solidification treatment, and Fig. 5 (b)
) is a perspective view showing an example of the solid material of the present invention, FIGS. 6 and 7
The figure shows another example of the apparatus employed in the method of the present invention, and is a diagram corresponding to FIG. 1. (Explanation of symbols) 4.4'... Screw device, 6.6'... Rotating pressing body, 7... Perforated plate, 9... Rod-shaped solid material, 1
1... Input port - One or more applicants Oike Iron Works Co., Ltd. Agent Patent attorney (6235) Hidehiko Matsuno 7... Perforated plate;

Claims (1)

[Claims] 1. Steps of supplying Styrofoam waste and water from the input port to the screw device; Processes of crushing and feeding the input Styrofoam waste to the screw device; The waste is crushed and compressed by a rotary compressor connected to a screw device, and heated and melted using input water while suppressing excessive heat generation, and the semi-molten waste is extruded into a rod shape from a perforated plate. A method for solidifying Styrofoam waste, which includes the steps of draining residual water and draining the remaining water. 2. The solidification method according to claim 1, wherein the screw device comprises a parallel twin screw. 3. The solidification method according to claim 1, wherein the screw device comprises a single screw.