JPH0637055B2 - Waste resin processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is intended to heat-shrink thermoplastic foamed resin moldings such as used polystyrene foam moldings and wastes of other thermoplastics. The present invention relates to a waste resin processing device that shrinks the volume to a state that is easy to handle.

<Problems to be Solved by Conventional Techniques and Inventions> Conventionally, thermoplastic resin molded products such as expanded polystyrene molded products have advantages such as high heat insulating properties, light weight, and excellent cushioning properties. As various packaging materials and containers,
It is widely used in place of broken ball materials and wooden boxes.

Most of the wastes of the thermoplastic resin molded products are subjected to a thermal decomposition treatment or a recovery treatment for reuse.

However, regardless of which of the above treatments is performed, the waste of a bulky (low bulk density) thermoplastic resin molded product has a large apparent volume, so transportation from the disposal site to the treatment facility and other handling Was difficult and the handling cost was high.

In order to facilitate the above-mentioned handling, there is provided a processing device which heats, softens or melts the waste of the thermoplastic resin molded product to shrink the waste and to increase the bulk of the waste.

This processing device is provided with a heating furnace having a far-infrared heater as a heating source, and a belt conveyer for conveying waste is provided in the heating furnace. The belt conveyor can heat and shrink the waste while conveying the waste. Yes (Japanese Patent Laid-Open No. 1-11
No. 0912). The heating furnace is set so that the distance between the heater and the belt conveyor becomes closer toward the outlet side.

However, in the above processing apparatus, the height of the far-infrared heater on the outlet side is low, and therefore, the height of the heater must be adjusted each time the height of the waste changes, and the handling is troublesome. In this case, a far infrared heater can be provided on the side surface, but in the case of waste such as expanded polystyrene, the waste may contact the heater and ignite.

Further, in the above-mentioned processing apparatus, since the waste is only heated and shrunk by the far infrared heater, uneven heating occurs, and the waste that is violently melted becomes a hard resin when cooled and solidified, and is crushed for reprocessing. There is a problem that a big noise is generated.

On the other hand, as shown in FIG. 4, a processing device provided with a blower 92 for blowing the air heated by the heater toward the waste below the far infrared heater 91 provided in the heating furnace 90. Is provided.

This treatment device can blow heated air around the heater toward the waste, and can heat the waste as a whole.

However, in this processing device, since a pipe for blowing out the air blower is provided below the heater, there is a drawback that the radiant heat from the heater is blocked by this pipe, and the thermal efficiency deteriorates. As a result, unevenness also occurs, and as described above, there is a drawback that a hard resin is partially formed or uneven shrinkage occurs.

Further, in any of the above processing devices, no means for positively cooling the waste after the heat treatment is provided, and the cooling property of the heated waste is poor, so it takes time to cool the waste. At the same time, the waste cannot be smoothly separated from the transfer conveyor.

For this reason, some processing equipment is provided with air blowing means at the outlet of the heating furnace, but in this case, operating the air blowing means disperses the bad odor generated from the heated waste, so It also has the drawback of deteriorating the environment.

Therefore, in view of the above problems, the present invention can efficiently perform the heat shrinkage treatment by efficiently cooling the waste after heating, and further, by contaminating the air, the work environment is improved. It is an object of the present invention to provide a processing device for waste resin that does not deteriorate.

<Means for Solving the Problems> In order to achieve the above object, the processing apparatus according to the present invention is provided with a heating means for heating and shrinking waste, and a cooling means for cooling the heat-shrinked waste. The heating means is connected to the heating means, and further, a conveying means for continuously conveying the waste to the heating means and the cooling means is provided. The heating means includes a far-infrared heater for heating the waste and the waste. A far-infrared heater is provided in a direction orthogonal to the conveying direction of the conveying means, and the air-blowing pipes are arranged at substantially the same height as the nuclear heater between the far-infrared heaters. The feature is that they are installed side by side.

Further, the processing apparatus may further include an exhaust unit for exhausting the heating unit and the cooling unit.

<Operation> According to the above processing apparatus, the waste heat-shrinked by the heating unit can be quickly cooled by the cooling unit, and the cooling time can be shortened to efficiently perform the heat-shrinking process.

In addition, the ventilation pipe that blows air toward the waste is installed at approximately the same height as the far-infrared heater, and is arranged so as not to block the radiant heat from the heater, so that the irradiation from the far-infrared heater is blocked. It is possible to carry out the heating without the need, and the hot air which tends to stay in the upper part can be efficiently blown to the waste by the blower pipe.

Further, if the exhaust means is provided, the odor generated when the waste is heated can be discharged, and the risk of the odor leaking out of the device can be eliminated.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a waste resin treating apparatus as an embodiment of the present invention. This processing apparatus is provided with a heating chamber 1 as a heating means for heating and shrinking a waste D of a thermoplastic article such as a thermoplastic foamed resin molded article, and a heating chamber 1 connected to the heating chamber 1 and heat-shrinked. Inside the cooling chamber 2 as a cooling unit for cooling the waste D, and inside the heating chamber 1 and the cooling chamber 2, the surface contacting the waste D is made of a fluororesin as a transporting unit for transporting the waste D. The formed belt conveyor 3 is provided.

The heating chamber 1 is configured so that the indoor space has a rectangular shape, and a heat insulating material is inserted throughout the heating chamber 1, and an inlet and an outlet for inserting the waste D through the belt conveyor 3 are opened. ing. In the upper part of the heating chamber 1, a far-infrared heater 11 composed of a combination of a ceramic heater that emits far-infrared rays having a predetermined wavelength (usually 3 to 13 μm) and a reflecting mirror is arranged in a direction orthogonal to the conveyance direction of the belt conveyor 3. A plurality of them are arranged. Blower tubes 15 for blowing air from above the heating chamber 1 in the direction of waste D are arranged in parallel between the ceramic heaters of the far infrared heater 11 and have substantially the same height as the far infrared heater 11. And is arranged so as not to interfere with the irradiation from the heater.

As shown in FIG. 2, the blower pipe 15 is provided with a large number of air ejection ports 15a in the longitudinal direction thereof, and
Blowers 16 are connected to all the blower pipes 15 via pipes 17. As a result, when the blower 16 is driven, an appropriate amount of air can be sent to the air ejection port 15a, and the air heated by the far-infrared heater 11 is directed toward the waste D conveyed below it. Moreover, it is possible to uniformly feed the belt conveyor 3 in the heating chamber 1.

The cooling chamber 2 is provided with an iron plate 21 having a large number of slits or small holes formed above the waste D conveyed by the belt conveyor 3. The cooling chamber 2 is located above the iron plate 21.
A cooling blower 22 is connected to the ceiling of the above through a pipe 23. As a result, when the cooling blower 22 is driven, air is sent into the cooling chamber 2 through the pipe 23, and this air is spread by the iron plate 21 in the entire horizontal direction and blown out from the slits or small holes. The waste D can be cooled evenly.

The belt conveyor 3 is stretched over rolls 31 and 32 provided on the inlet side of the heating chamber 1 and the outlet side of the cooling chamber 2, and one of the rolls is driven to move the belt conveyor 3 at a predetermined speed. Rotate.

At the end of the belt conveyor 3, the contracted waste D
Scraper 36 is provided for separating the waste D from the belt conveyor 3 and transferring it to the discharge conveyor 35.
Can be automatically discharged.

In the processing apparatus of this embodiment, the air leaking from the heating chamber 1 and the cooling chamber 2 and the gas generated in the heating chamber 1 are exhausted. An exhaust device 4 for exhausting the respective air inside 1 is provided.

The exhaust device 4 is equipped with intake ducts 41 and 42 for taking in air near the inlet of the heating chamber 1 and near the outlet of the cooling chamber 2, and the intake air provided on the ceiling of the heating chamber 1 and these ducts 41 and 42. Pipes 44, 45, 4 having air amount adjusting valves 43a, 43b, 43c in the middle of the hole 18
6 are connected to each other, and these pipes 44, 45, 46
An intake blower 47 is connected to.

As a result, the gas, odor, etc., generated when the waste D is heated can be discharged. Further, particularly by appropriately adjusting the air amount adjusting valves 43a and 43c provided in the middle of the pipe, it is possible to promptly discharge the gas and the like without extremely reducing the temperature in the heating chamber 1.

Further, although not shown, a gas concentration detection device (not shown) for detecting the concentration of the combustible gas generated when the waste D is heated is provided in the heating chamber 1 or the cooling chamber 3 to detect the gas concentration. By electrically connecting the device to the intake blower 47, the flammable gas can be automatically discarded when the detected value becomes larger than the specified value.

Next, the operation of this processing apparatus will be described.

For example, in various factories, packaging materials for parts are discarded as waste D at a plurality of locations along the assembly line, and therefore the processing device is arranged at a predetermined disposal location.

Then, the waste D is supplied onto the belt conveyor 3 rotating at a predetermined speed, and the waste D is conveyed into the heating chamber 1.

In the heating chamber 1, the far-infrared heater 11 removes the waste D
Although it is heated to about 00 ° C., since the far infrared heater is used, it is possible to reliably heat the inside of the waste D.

In addition, in the heating chamber 1, one by one is provided in parallel with the far-infrared heater, at a position where the irradiation from the heater is not obstructed, and an air ejection port 15a is provided in the longitudinal direction from the blower pipe 15. Since the air is blown, the high temperature that tends to stay in the upper portion of the heating chamber 1 can be uniformly and uniformly blown to the waste D, and the thermal efficiency can be improved. Therefore, the belt conveyor 3 and the far-infrared heater 11 are arranged so that various wastes D can pass through.
There is no possibility that the processing efficiency will be reduced even if a sufficient space is provided between and. Therefore, it is not necessary to adjust the height of the heater, which is conventionally performed according to the type of waste D.

Since the blower pipe 15 is provided at substantially the same height as the far infrared heater 11, the blower pipe 15 can efficiently heat the waste D without blocking the radiant heat from the far infrared heater.

The waste D is heated in the heating chamber 1 so that the waste D is shrunk and reduced in volume, and is sent to the next cooling chamber 2 by the belt conveyor 3.

The cooling chamber 2 is provided continuously to the heating chamber 1 and can blow cooling air, so that the waste D can be cooled in a short time, and the processing efficiency can be improved.

Then, the air from the cooling blower 22 is used as the blast.
Since it is performed through a slit or a small hole after hitting 1, the waste D can be diffused and blown so as to be evenly blown over the entire waste D.

The waste D cooled in the cooling chamber 2 is peeled off from the belt conveyor 3 by the scraper 36 at the end of conveyance of the belt conveyor 3 and transferred to the discharge conveyor 35 to be conveyed for reuse.

As described above, the scraper 36 is used to convey the belt conveyor 3
Since the waste D is uniformly and rapidly cooled in the cooling chamber 2 when it is peeled off, the waste D is completely cooled and the peelability is improved, and the workability can be improved.

Further, since the exhaust device 4 is provided, gas and odor generated when the waste D is heated are not likely to leak to the outside of the device, and air pollution or the like may not deteriorate the working environment.

In particular, by discharging the air in the heating chamber 1, it is possible to quickly remove the gas generated during heating from the vicinity of the surface of the waste D, and the radiant heat from the heater can be efficiently applied to the waste D. it can.

In the above embodiment, the far-infrared heater 11 has a rod-shaped ceramic heater, but it may be formed in a planar shape, in which case a reflector is not necessary.

The position of the blower pipe 15 may be provided slightly above the heater as long as it does not hinder the irradiation of the heater.

Further, as the conveying means, in addition to the belt conveyor 3 formed of the above-mentioned fluororesin, one made of tetrafluoroethylene resin reinforced with glass fiber, a chain or Teflon processed conveyor, and further formed of stainless steel. It is also possible to use a conveyor or the like, and the present invention is not limited to the above-mentioned embodiment, and various design changes can be made without changing the gist of the present invention.

As the foam of the thermoplastic resin for packing which becomes the waste D, in addition to the above polystyrene, an ethylene homopolymer, an ethylene copolymer such as ethylene-vinyl acetate,
Polyolefin resin such as propylene homopolymer, or expanded particles in which polyolefin resin and polystyrene resin are at least partially graft-bonded, for example, styrene monomer in the nucleus by sucking styrene monomer in the nucleus by using polyethylene particles as a nucleus There is a foam or the like in which the above particles are fused with each other by polymerizing the expanded particles graft-bonded to polyethylene and further adding a foaming agent to the expanded particles.

<Example> In the above processing apparatus, when the waste D is heated in the heating chamber 1, the waste is changed depending on whether the air is blown from the blower pipe 15 or not. The change in the contraction state of D was tested.

The test waste D is an expanded polystyrene molded product for packaging machine parts and has an expansion ratio of 40 times.

Test conditions Heater surface temperature: 380 ° C Conveyor speed: 1.0m / min Distance from conveyor to heater: 350mm Test method When the waste D is heated while the air is being blown from the blower pipe 15, this blowing is performed. When the waste D was heated without the heating, the heating time of the waste D, the surface temperature of the waste D, and the time required to complete shrinkage were measured.

Test Results As shown in FIG. 3, when the heat treatment was performed while blowing air, the time required to complete the shrinkage was 2 minutes and 50 seconds, and the surface temperature of the waste D at that time was 194 ° C. ( (See symbol A).

On the other hand, when the treatment was performed without blowing air, the time required until the shrinkage was completed was 3 minutes and 30 seconds, and the surface temperature of the waste D at that time was 210 ° C. (see symbol B).

As described above, by performing the heat treatment while blowing air, the time required for the heat shrinkage of the waste D can be shortened, and the treatment can be performed in the state where the surface temperature is low. Furthermore, when air was blown, the waste D could be almost completely melted. Therefore, there is an effect that noise can be reduced when the contracted waste D is crushed for reuse.

<Effects of the Invention> According to the processing apparatus having the above configuration, as the heating means, a far-infrared heater that heats waste and a blower tube that blows air in the waste direction are provided. Since a plurality of blowers are arranged in the direction orthogonal to the carrying direction of the carrying means and the blower tubes are arranged in parallel between the far-infrared heaters, the heat shrinkage treatment of the waste can be efficiently performed. The height adjustment is not necessary and the handling is easy.

Further, the far-infrared heater and the blower tube provided in the heating means are provided at substantially the same height, and heating can be performed without interrupting the irradiation heat from the far-infrared beater. Hot air that tends to stay in the upper part of the heating means
The blower pipe can efficiently blow the waste below.

Moreover, since the waste material heated and shrunk by the heating means can be rapidly cooled by the cooling means, the cooling time can be shortened and the shrinking treatment cycle can be accelerated. In addition, since the waste can be completely cooled, the peelability from the conveying means is improved, and such advantages synergize, and the heat shrinkage treatment efficiency of the waste can be significantly improved.

Further, since the processing device provided with the exhaust means can discharge the odor and the like generated when the waste is heated to the outside of the device, it is possible to eliminate the possibility that the odor and the like leak to the vicinity of the device. Therefore, there are various excellent effects such as preventing the work environment from being deteriorated due to air pollution.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a processing apparatus showing an embodiment of the present invention, FIG. 2 is a sectional view as seen from the side of a heating chamber, and FIG. FIG. 4 is a sectional view of a main part of a conventional processing apparatus. 1 ... Heating chamber, 2 ... Cooling chamber, 3 ... Belt conveyor, 4 ... Exhaust device, 11 ... Far-infrared heater, 15 ... Blower pipe, D ... Waste.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masato Yaita 205-2 Shinkuta, Furukawa City, Ibaraki Prefecture (56) Reference JP-A-57-2723 (JP, A)

Claims (2)

[Claims] Claim: What is claimed is: 1. A waste resin processing apparatus for stretching waste materials such as thermoplastic foamed resin moldings, provided with heating means for heating and shrinking the waste material, and cooling for cooling the heat-shrinkable waste material. Means are provided to be connected to the heating means, and further, a conveying means for continuously conveying the waste to the heating chamber and the cooling means is provided, and the heating means includes a far-infrared heater that heats the waste. A far-infrared heater is provided in a direction orthogonal to the carrying direction of the carrying means, and the far-infrared heater is substantially the same as the nuclear heater between the far-infrared heaters. A waste resin processing device, which is arranged in parallel at a height. 2. The processing apparatus for waste resin according to claim 1, further comprising exhaust means for exhausting the heating means and the cooling means.