JPS6125528B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoplastic resin melting apparatus for melting waste materials made of thermoplastic resins, such as styrofoam, for recycling.

Styrofoam, which is often used as a cushioning material for packaging, is normally disposed of as waste after one use, but recently, the Styrofoam is melted with hot air and the resulting melt is recycled. It is being solidified and reused as a raw material for plastics. There are various types of melting equipment for melting thermoplastic resins such as Styrofoam, but in order to promote the melting of Styrofoam, Styrofoam is crushed into small lumps using a crusher, and the small lumps are Generally, the material is placed in a melting furnace and melted by hot air.

However, in conventional melting furnaces, a hopper has an input port at the top and a discharge port at the bottom, and a large number of hot air jet ports are provided on the outer peripheral wall of the hopper. It is configured to melt the nodule and allow the melt to flow out of the outlet. Therefore, the hot air outlet provided on the outer peripheral wall of the hopper may be blocked by the molten material or semi-molten material, and hot air may not be sufficiently ejected into the hopper. Further, since the discharge port is provided at the center of the lower end of the hopper, the discharge port may be blocked by unmelted small lumps, and the molten material may not flow out smoothly from the discharge port. This is because the hopper is funnel-shaped and has a discharge port at the bottom end, and the small lumps that are thrown in are concentrated at the discharge port, making it possible to efficiently melt the small lumps that are continuously thrown in. There are circumstances that prevent it from being discharged.

This invention was made in view of the above-mentioned circumstances, and its purpose is to form a partition plate that partitions the heating chamber and the melting chamber into a substantially conical shape, so that the melted material to be charged is placed in one place. In addition to promoting melting by dispersing the hot air without concentrating it, a hot air outlet that also serves as a discharge port for the molten material is provided at the outer peripheral edge of the partition plate to ensure that the molten material flows out smoothly. The object of the present invention is to provide a thermoplastic resin melting device that can thermally and efficiently melt a material to be melted.

The present invention will be described below based on an embodiment shown in the drawings. Reference numeral 1 in FIG. 1 denotes a cylindrical main body, which is made of a heat-resistant material with a heat insulating material interposed therebetween. A partition plate 2, which will be described later, is disposed in the middle of the main body 1 in the vertical direction, and divides the inside of the main body 1 into an upper melting chamber 3 and a lower heating chamber 4. Further, the top plate portion 5 of the main body 1 is provided with an input port 7 having an opening/closing lid 6 and an exhaust pipe 9 having a damper 8, each communicating with the melting chamber 3. Further, a funnel-shaped melt guide plate 10 is provided at the lower part of the main body 1 and forms a bottom part with the heating chamber 4, and an outlet body 11 is provided in the center of the melt guide plate 10. ing. Further, a band heater 12 is wound around the outlet body 11, and a chopstick and a hot plate 13 are provided above the band heater 12, and the hot plate 13 and the melt guide plate 10 are connected to each other. A heat chamber 14 is formed in between.
A receptacle 16 for receiving the melt is removably provided in the take-out chamber between the main body 1 and the bottom 15.
This saucer 16 can be entered and exited through an entrance 17 provided in the side wall of the main body 1. Further, an opening 1 is provided in the side wall of the main body 1 corresponding to the heating chamber 4.
8, and a jet heater 19 for blowing hot air into the heating chamber 4 is removably installed in this opening 18.

Further, as shown in FIGS. 2 and 3, the partition plate 2 is formed of a heat-resistant metal plate into a substantially conical shape, with a central portion protruding into the melting chamber 3. There is. Further, the outer peripheral edge 20 at the lower end of the partition plate 2 has a brim shape, and the outer peripheral edge thereof is fixed to the inner peripheral wall of the main body 1. A large number of hot air outlets 21 made of circular holes are bored in the inclined surface of this partition plate 2, and a large number of slit-shaped hot air outlets 22 are radially formed in the outer peripheral edge 20 of the lower end. It is perforated. Further, the hot air jet ports 22 also serve as melt discharge ports.
Further, the hot air outlet 22 in the portion facing the jet heater 19 is closed by a cover 23 provided on the upper surface of the lower outer peripheral edge 20 to prevent molten material from adhering to the outlet of the jet heater 19. are doing.

The band heater 12 and jet heater 19 are connected to a power source, and the temperature of the band heater 12 is controlled by a thermostat. Furthermore, a temperature sensor 24 and a pressure sensor 25 are provided in the heating chamber 4 to sense the temperature and pressure in the heating chamber 4, and to detect the temperature drop and pressure drop that occur when the jet heater 19 runs out of fuel or malfunctions. It is designed to detect and issue an alarm.

The melting apparatus configured in this manner has a caster 26 provided at the bottom of its main body 1, and the jet heater 19 is provided with a caster 28 on a pedestal 27, so that it can be moved to any position outdoors. ing.

When the jet heater 19 is operated and the band heater 12 is energized, the hot air discharged from the jet heater 19 is sent into the heating chamber 4, and the pressure inside the heating chamber 4 is kept higher than that inside the melting chamber 3 due to the partition plate 2. As the hot air drips down, the hot air is ejected into the melting chamber 3 from the hot air ejection ports 21 . . . , 22 . At this time, the melt guide plate 10 is also heated by the hot air, and its outlet body 11 is heated by the band heater 12. While the water is emptied for a certain period of time (10 to 15 minutes), a saucer 16 containing water is set at the bottom of the outlet body 11. In this state, when a material to be melted, such as a thermoplastic resin such as styrene foam, which has been crushed in advance using a crusher, is introduced from the input port 7, the material to be melted is placed on the upper surface of the partition plate 2, but is covered by the protrusion of the partition plate 2. The melt is deposited from the periphery and is contained in a substantially uniform state. At this time, the partition plate 2 is heated to a high temperature by the hot air, and the hot air is blown out from the hot air jet ports 21..., 22..., so the material to be melted is not limited to the lower part due to the protrusion of the partition plate 2. , it is also heated from the inside and melted from its lower layer. Because the melt has fluidity, it flows along the slope of the partition plate 2, and most of it is heated by the partition plate 2 without hanging down from the jet ports 21 due to the hot air jetted from the jet ports 21. Slit-shaped hot air outlet 22 on the outer peripheral edge 20
Flows down from... The melt that has flown down onto the upper surface of the melt guide plate 10 flows down along the melt guide plate 10 while being heated by the hot air, and further flows through the outlet body 1.
1 and is discharged into the saucer 16. At this time, the molten material on the outside is cooled by the outside air, but is heated to an appropriate temperature by the band heater and constantly flows out. Since water is contained in the saucer 16, the molten material is cooled and solidified by the water. on the other hand,
Exhaust gas and odor generated in the melting chamber 3 are exhausted to the outside from the exhaust pipe 9, and the pressure inside the melting chamber 3 can be controlled by adjusting the opening degree with a damper 8 in the exhaust pipe 9. , input port 7 for the material to be melted
This prevents backflow to the exhaust pipe and scattering from the exhaust stack. Therefore, by continuously or intermittently charging the material to be melted from the input port 7, it is melted in the melting chamber 3, and the melt is transferred from the outlet body 11 via the melt guide plate 10. It can be deposited in the saucer 16. At this time, the outlet body 11 is constantly heated by the band heater 12, so that the melt can be kept in a fluidized state.
It can be flowed down smoothly. Moreover, continuous operation is possible by appropriately taking out the deposits accumulated in the saucer 16 when they reach a certain volume.

In the above-mentioned embodiment, a case was explained in which Styrofoam was melted, but any thermoplastic resin can be similarly melted. Furthermore, the melt guide plate 10 may be formed with a tapered main body.

As explained above, this invention forms the partition plate that partitions the heating chamber and the melting chamber into a substantially conical shape,
Since the hot air outlet is provided on the inclined surface and the outer peripheral edge of the lower end, the material to be melted is dispersed without being concentrated in one place, and the hot air is also injected from the part that protrudes into the inside of the pile, so the hot air outlet The hot air blown out from the melter contacts the material to be melted evenly, allowing efficient melting. Then, as high-pressure hot air is ejected from the sloped surface of the partition plate, the molten material flows along the slope to the outer periphery without hanging down from the spout of the partition plate, and is sufficiently heated to flow down from the hot air spout. The hot air outlet is not blocked by the material to be melted, and it flows smoothly, and the molten material immediately flows down the slope, making it possible to melt the material efficiently and stably. It has excellent effects both in terms of efficiency and thermal efficiency.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention.
2 is a partially cutaway front view of the device, FIG. 2 is a plan view of the partition plate, and FIG. 3 is a side view of the partition plate. DESCRIPTION OF SYMBOLS 1... Main body, 2... Partition plate, 3... Melting chamber, 4... Heating chamber, 7... Inlet, 9... Exhaust pipe, 12... Outlet body,
16... saucer, 19... jet heater, 20... lower end outer periphery, 21, 22... hot air outlet.

Claims (1)

[Scope of Claims] 1. A partition plate is provided in a main body formed of a heat-resistant material to partition an upper melting chamber and a lower heating chamber having a jet heater, and a melting chamber is provided in the upper part of the main body. An inlet for the melt to be melted and an exhaust pipe are provided in communication with the heating chamber, and an outlet body for the melt and a receiver for the melt are provided in the lower part of the main body to communicate with the heating chamber.
The partition plate has a substantially conical shape with a central portion protruding into the melting chamber, and its lower outer peripheral edge is fixed to and supported by the inner peripheral wall of the main body, and the inclined surface and outer peripheral edge of the partition plate are fixed to and supported by the inner peripheral wall of the main body. 1. A thermoplastic resin melting apparatus characterized in that a plurality of hot air jetting ports for jetting hot air from the heating chamber into the melting chamber are provided in the heating chamber. 2. Claim 1, characterized in that the hot air outlet provided on the outer peripheral edge of the partition plate is a radially arranged slit, and serves both as a hot air outlet and as a melt outlet. The thermoplastic resin melting apparatus described. 3. The thermoplastic resin melting apparatus according to claim 1 or 2, wherein the outlet body has a heater whose temperature can be freely adjusted.