KR20150018069A - Energy saving type apparatus for manufacturing modeled article using foamed plastics - Google Patents

Abstract

An apparatus for manufacturing a foamed plastic molded article of the present invention comprises: a molder (120) which performs heating in order to mold a foamed plastic product by receiving steam (S) from a main steam pipe (110); a waste steam collection part (200) which supplies waste steam (S′) in a reusable shape by collecting the waste steam (S′) produced in the molder (120); and a dry process part (300) which dries a foamed plastic molded article by using the steam (S) supplied from the main steam pipe (110) and the waste steam (S′) supplied from the waste steam collection part (200). In case of need, the apparatus for manufacturing a foamed plastic molded article is able to additionally comprise a pre-foaming process part (400) which receives the waste steam (S′) from the waste steam collection part (200). The waste steam collection part (200) includes a waste steam collection tank (210), a pressure control pipe (220), an expansion tank (230) and a subsidiary tank (250) and is able to control pressure and solve sub-atmospheric pressure generated in the waste steam collection tank (210).

Description

TECHNICAL FIELD [0001] The present invention relates to an energy saving foamed plastic molded article manufacturing apparatus,

The present invention relates to a molded article manufacturing apparatus using foamed plastic. More specifically, when a molded article is produced from foamed plastic, it is used in a heating process to separate and recover the waste steam, which is then used as a heat source for the drying process and / or the preliminary foaming process, thereby improving energy efficiency. To a plastic molded article manufacturing apparatus.

Generally, a foamed plastic refers to a synthetic resin made of a porous structure by using a foaming agent or injecting air or gas to densely form bubbles in the tissue.

The main raw material synthetic resin for such foamed plastics is polystyrene, polyurethane, polyolefin, polypropylene, polyethylene, etc., but various synthetic resins are used as raw materials.

A conventional apparatus for producing a molded article using expanded polystyrene from among the foamed plastics will be described below as an example.

Since foamed polystyrene is excellent in light weight, water resistance, heat insulation, soundproofness and buffering property, it is widely used for construction material, industrial material, decorative material, insulation material in various industrial fields including packing materials which can be easily accessed in everyday life do.

The production of foamed polystyrene molded articles may be carried out by various processes such as a raw material filling process, a steam preheating process, a one-way heating process, a reverse heating process, a two-side heating process, a holding process, a cooling process, a drainage process, a vacuum process, a mold opening process, ) Process. The process sequence, process execution time, and process type are slightly different depending on the thickness of foamed polystyrene molded product and the expansion ratio.

A general manufacturing process of a foamed polystyrene molded article will be briefly described.

First, the raw material of the polystyrene blended with the prepared foaming agent is put into the mold, and then the pressure is elevated by steam. As a result, the foaming agent reacts to form bubbles and expand, resulting in the effect that the expanded polystyrene is filled in the mold and pressed by the mold. Then, when the heated mold is cooled, the molded expanded polystyrene shrinks slightly and can be easily separated from the mold. The thus-prepared expanded polystyrene molded article is dried in a drying chamber and then supplied as a product.

A general configuration of such a conventional apparatus for manufacturing a foamed polystyrene molded article is shown in Fig. 1, a conventional apparatus for manufacturing a foamed polystyrene molded article 1 is supplied with steam S as a heating heat source through a collapsible organs 10 into molding machines 20a and 20b filled with expanded polystyrene raw materials . To this end, fixed-side steam valves 21a and 21b are connected to pipes connected to the fixed-side molds of the molding machines 20a and 20b, and movable-side steam valves 23a and 23b are connected to the piping connected to the movable- Respectively.

The fixed side exhaust valves 25a and 25b and the movable side exhaust valves 27a and 27b are also provided in the pipes provided from the fixed side molds and the movable side molds of the molding machines 20a and 20b toward the collector pipe 30, respectively.

The unidirectional heating process in the conventional apparatus for producing a foamed polystyrene shown in Fig. 1 will be briefly described. First, in the one-way heating process, when the fixed-side steam valves 21a and 21b are opened, the steam S supplied through the main engine 10 heats and expands the foamed polystyrene raw material filled in the molding machine. The steam after the heating operation becomes condensed water or pulmonary steam (S '), which is discharged by opening the movable side exhaust valves 27a and 27b. At this time, the condensed water is discharged separately together with the pulmonary steam (S '). During the one-way heating process, the movable side steam valves 23a and 23b and the fixed side exhaust valves 25a and 25b are kept closed.

The steam (S) normally supplied in the one-way heating process is supplied for about 10 to 20 seconds at a pressure of about 0.3 MPa. At this time, when the inner pressure of each of the molding machines 20a, 20b reaches a set pressure (for example, 0.07 MPa), the supply of steam is stopped. The steam pressure and the steam supply time may vary depending on the thickness and shape of the product.

Next, a reverse heating process in a conventional apparatus for manufacturing a foamed polystyrene molded product will be briefly described. In the backward heating process, the movable side steam valves 23a and 23b are opened for about 3 to 7 seconds to supply the steam S as opposed to the one-way heating process described above, and the steam after the heating operation is supplied to the fixed side exhaust valves 25a, 25b are opened and discharged in the form of condensed water and pulmonary steam (S '). Of course, during this process, the fixed side steam valves 21a, 21b and the movable side exhaust valves 27a, 27b remain closed.

Next, a conventional double-sided heating process in a foamed polystyrene molded article manufacturing apparatus will be briefly described. The fixed side exhaust valves 25a and 25b and the movable side exhaust valves 27a and 27b are closed and the fixed side steam valves 21a and 21b are closed while the expanded polystyrene raw material is heated in the molding machines 20a and 20b and foamed, 21b and the movable side steam valves 23a, 23b are briefly opened to heat the surface of the foamed polystyrene product for about 1 to 2 seconds. The steam after the heating operation opens the fixed side exhaust valves 25a and 25b and the movable side exhaust valves 27a and 27b to discharge them in the form of condensed water and waste steam S '.

The above-described double-sided heating process is a process performed to smooth the surface of a foamed expanded polystyrene product.

Next, a cooling step of cooling the molding machines 20a and 20b by using cooling water at a predetermined temperature (for example, 40 to 60 ° C) is performed. When the cooling process is completed, the mold of the molding machine is opened to separate the molded expanded polystyrene product from the mold, and then transferred to the drying chamber to perform the drying process.

The drying step refers to a step of transferring the foamed polystyrene molded product to the drying chamber 50 and then drying it with hot air (H) at about 60 to 70 캜. Such hot air drying can remove the moisture contained in the foamed polystyrene molded product and vaporize the remaining foaming agent.

The drying process of a conventional apparatus for manufacturing a foamed polystyrene molded product will be briefly described with reference to FIG. The heating source of heat in the drying chamber 50 is the steam (S) supplied to the main engine 10. The air sucked in the drying chamber 50 by the operation of the blower 57 is converted into the hot air H of high temperature by the heating action of the heater 55 supplied with the steam S.

The hot air H is supplied into the drying chamber 50 through the duct 58 to dry the foamed polystyrene molded article in the drying chamber 50.

The temperature control inside the drying chamber is controlled by a temperature control valve 51 provided in the main engine 10 to regulate the supply amount of the steam S and a temperature control valve 51 for detecting the temperature inside the drying chamber 50, And a temperature controller 53 for applying a control signal to the temperature controller 53.

The condensed water generated in the heater 55 is circulated through the condensed water trap 56 and circulated to the boiler which generates the steam.

In the conventional apparatus for manufacturing a foamed polystyrene molded product, 80 to 90% of the supply amount of steam as a heating heat source generated in the boiler is used in the heating process of the molding machine, and the remaining 10 to 20% is generally used in the drying process of the drying chamber .

However, in the conventional apparatus for manufacturing a foamed polystyrene molded article, the waste steam used in the heating process of the molding machine is discarded as it is. Therefore, the conventional apparatus for manufacturing a foamed polystyrene molded product has a problem that the heat loss is very large, which causes excessive energy cost and is not environmentally friendly.

On the other hand, a process for producing a foamed plastic using other synthetic resin as a raw material is similar to the above-mentioned expanded polystyrene. Particularly, in the case of the production process of foamed polypropylene, there is only a difference that only the steam pressure can be used at a higher pressure, and the rest of the production process is almost the same.

It is an object of the present invention to provide an apparatus for manufacturing an energy-saving foamed plastic, which is used in a heating process for molding in a foamed plastic manufacturing process and is capable of recovering discarded waste steam and reusing it.

Particularly, the present invention provides another technical problem to solve the problem of the negative pressure which frequently occurs in the apparatus when the vacuum pump is used to recover the waste steam discharged after the heating process.

The present invention relates to Korean Patent Application No. 2012-0015801 filed on February 16, 2012 by the applicant of the present invention to the Korean Intellectual Property Office.

In order to solve the above technical problems, the present invention provides the following technical constructions.

The present invention relates to a method of manufacturing a foamed plastic molded article, which comprises a molding machine for molding a foamed plastic article using steam, a waste steam recovery part for recovering the waste steam discharged from the molding machine, and a drying part for using the waste steam supplied from the waste steam recovery part as a heating heat source Wherein the waste vapor recovery section has a waste vapor recovery tank and an auxiliary tank thereof.

Particularly, the waste vapor recovery tank is connected to the molding machine and the waste steam inlet pipe, and connected to the drying toilet pipe through a waste steam supply pipe. The auxiliary tank is configured such that the lower end thereof communicates with each other by the waste steam recovery tank and the condensed water discharge pipe so that the condensed water can flow to each other. The upper end of the auxiliary tank communicates with the waste steam recovery tank and the communication pipe, . The upper portion of the auxiliary tank is provided with a high-pressure gas supply pipe for supplying high-pressure gas, which mainly supplies the high-pressure steam into the auxiliary tank.

A pressure control pipe is installed on the side of the waste vapor recovery tank. One of the pressure control pipes is connected to the upper portion of the waste vapor recovery tank, and the other is connected to the expansion tank.

Also, in the present invention, a plurality of expansion tanks (230) can be installed at various heights to correspond to the set pressure change of the pressure control pipe (220).

The drying unit includes a drying chamber, a duct through which the air in the drying chamber circulates, and a heating means for heating the circulated air to generate hot air. The heating means includes a steam heat source supply unit that uses steam as a heat source, And a waste heat source for supplying the waste heat to the waste heat source.

In the present invention, a vacuum pump may be used as the means for sucking the waste steam from the waste-steam recovery unit to the heater in the waste-steam heat source supply unit.

In addition, in the present invention, the pre-foaming process unit may be added to perform a process of supplying a part of the waste steam of the waste vapor collecting unit to the pre-bubbling chamber for spraying. Particularly, as a means for injecting the waste steam into the pre- .

The apparatus for manufacturing a foamed plastic article of the present invention can solve the problem that the negative pressure is generated in the waste vapor recovery tank and the condensed water is not discharged properly when the discharged waste steam is sucked by using the vacuum pump for recycling the waste steam , Thereby enhancing the operational reliability of the apparatus.

Further, since the allowable pressure of the pulmonary steam in the pulmonary vapor recovery tank of the present invention can be variously set by using the pressure control pipe 220 and the expansion tank installed in multiple stages, There is an effect that it becomes easy.

In addition, the present invention can recover the waste steam that has been discarded after the heating process of the foamed plastic and recycle it as a heat source necessary for the drying process or the prefoaming process of the foamed plastic, thereby improving the energy efficiency and reducing the production cost.

1 is a schematic view showing a conventional foamed plastic manufacturing apparatus.
Fig. 2 is an overall structural view of a foamed plastic manufacturing apparatus according to a first embodiment of the present invention; Fig.
3 is a schematic view showing a configuration of a waste vapor recovery unit according to Embodiment 1 of the present invention.
Fig. 4 is an overall structural view of a foamed plastic manufacturing apparatus according to a second embodiment of the present invention; Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The embodiment of the present invention shown in Figs. 2 and 4 exemplifies a constitution of an apparatus for manufacturing a foamed plastic molded article using polystyrene or polypropylene as a raw material. However, even if another synthetic resin is used as a raw material, the core technology composition proposed by the present invention shown in FIGS. 2 and 4 can be used as it is, except that some device components are deleted or repositioned or other device components It can be added.

[Example 1]

Fig. 2 schematically shows a configuration of an apparatus for producing a foamed plastic article according to Embodiment 1 of the present invention, and Fig. 3 specifically shows the structure of a waste vapor recovery unit according to Embodiment 1 of the present invention.

2, a foamed plastic molded article manufacturing apparatus 100 according to the present invention includes a molding machine 120 for heating a foamed plastic product to receive a vapor S from a collapsible organs 110, A waste steam recovery unit 200 for recovering the waste steam S 'generated in the molding machine 120 and supplying the waste steam S' in a form that can be recycled; And a drying unit 300 for drying the molded foamed plastic article using the waste steam S 'supplied from the recovery unit 200.

In the foamed plastic molded article manufacturing apparatus 100 shown in Fig. 2, two molding machines 120a and 120b are disclosed. The molding machine 120 includes a mold for filling a foam plastic raw material and performing a foam molding operation. The steam S, which is a heat source of heat necessary for the foam molding operation, is supplied into the molding machine 120 through the main engine 110.

The fixed-side steam valves 121a and 121b and the movable-side steam valves 123a and 123b are provided one by one in the pipe branching from the main engine 110 to the inlet side of the respective molding machines 120a and 120b. Each of the fixed side exhaust valves 125a and 125b and the movable side exhaust valves 127a and 127b is provided with a set in the pipe directed from the outlet side of each of the molding machines 120a and 120b to the collector pipe 140. [

A waste steam exhaust valve 130 is installed on the pipe from which the waste steam S 'is recovered. The installation position is between the outlet of the molding machine 120 and the fixed side exhaust valves 125a and 125b and the movable side exhaust valves 127a and 127b as shown in FIG.

The waste steam exhaust valve 130 shown in FIG. 2 is composed of four. That is, the first waste steam exhaust valve 130a, the second waste steam exhaust valve 130b, the third waste steam exhaust valve 130c, and the fourth waste steam exhaust valve 130d are included. The number of such pulmonary steam exhaust valves 130 may be increased or decreased depending on the number of installed molding machines.

3 is a schematic view showing a configuration of a waste vapor recovery unit according to an embodiment of the present invention.

The main components of the waste vapor recovery unit 200 are a waste vapor recovery tank 210, a pressure control pipe 220, expansion tanks 230a and 230b, and an auxiliary tank 250. In addition, it may further include a pressure control pipe level controller 240 and an auxiliary tank level controller 260.

The waste steam recovery tank 210 is a device for storing the waste steam S 'recovered at the outlet side of the molding machine 120 at a predetermined pressure.

A waste steam inlet pipe 201 through which the waste steam S 'is introduced is connected to a communication pipe 112 which communicates with the auxiliary tank 250, respectively, in the body of the waste steam recovery tank 210. The communication pipe 112 is provided with a steam shutoff valve 252b.

The upper portion of the waste-steam recovery tank 210 is provided with a waste-steam supply pipe 203 for supplying the waste steam S 'collected therein to the dry-cleaning unit 300. A condensate discharge pipe 273 is installed at a lower portion of the waste steam recovery tank 210 and connected to the collector pipe 140. A condensate discharge valve 252c is installed in the condensate discharge pipe 273 located between the lower portion of the auxiliary tank 250 and the lower portion of the waste steam recovery tank 210 to be described later.

A plurality of water separation plates 211 are installed inside the waste steam recovery tank 210. The water separator 211 separates water (condensed water) contained in the pulmonary steam S ', and the separated water falls and is stored in the lower portion of the pulmonary steam recovery tank 210.

The pressure regulating pipe 220 is a device for regulating the discharge pressure of the waste steam of the waste vapor recovery tank 210.

One side of the pressure control pipe 220 is connected to the upper portion of the waste vapor recovery tank 210 and the other side is connected to the expansion tank 230.

The pressure regulating pipe 220 is formed of a U-shaped pipe member, and water is filled in the lower portion of the U-shaped pipe in accordance with a permissible pressure of the waste steam collected in the waste vapor recovery tank 210.

The U-shaped lower pipe is provided with a pressure control pipe level sensor 221 for detecting the level of water sealed in the pressure control pipe 220.

A check valve 222 is installed on the upper side of the pressure control pipe 220 connected to the waste vapor recovery tank 210. The check valve 222 prevents the sealed water W of the pressure control pipe 220 from flowing back to the waste vapor recovery tank 210 when a negative pressure is generated inside the waste vapor recovery tank 210.

The pressure regulating pipe level controller 240 receives the signal detected by the pressure regulating pipe level sensor 221 and controls the opening and closing of the sealed water supply valve 231a so that the external filling water W is supplied to the pressure regulating pipe 220, Adjust the supply.

One or more expansion tanks 230 may be provided, and the correct number of expansion tanks 230 is determined by the designer as needed. In the embodiment of FIG. 3, two expansion tanks, that is, a first expansion tank 230a and a second expansion tank 230b are provided connecting the pressure control pipe 220 and the discharge connection pipe 233.

A second expansion tank valve 231b is provided on the pipe leading to the second expansion tank 230b.

The reason why the first expansion tank and the second expansion tank are installed at different heights is to set the back pressure of the waste steam differently according to the thickness of the foamed plastic article. For example, if the installation height of the first expansion tank is 3,000 mm and the back pressure of the corresponding pulmonary steam is 0.03 MPa and the installation height of the second expansion tank is 2,000 mm in the process of manufacturing a foamed polystyrene molded article, The back pressure can be allowed to be 0.02 MPa. If the process is a foamed polypropylene manufacturing process, the respective pulmonary steam backpressure can be allowed to be higher.

Referring to FIG. 3, the first expansion tank 230a is longitudinally disposed in a transverse direction, and the second expansion tank 230b is longitudinally disposed in a longitudinal direction. Such a layout is merely selected in consideration of the convenience of design and the connection relation between the respective structures, and the form thereof may be slightly changed through various embodiments.

The auxiliary tank 250 is a device for regulating the level of the waste vapor recovery tank 210. The auxiliary tank 250 is provided with an auxiliary tank water level sensor 251 to detect the water level inside the tank.

A high pressure gas supply pipe 111 branched from the main combustion chamber 110 is connected to the upper portion of the auxiliary tank 250. The high-pressure gas supply pipe 111 is provided with a steam supply valve 252a.

The lower portion of the auxiliary tank 250 is connected to the condensed water discharge pipe 273 to discharge the condensed water therein. Therefore, the auxiliary tank 250 and the waste-steam recovery tank 210 can communicate with each other by the condensed-water discharge pipe 273.

A condensate discharge valve 252d is installed in the condensate discharge pipe 273 connected to the collector pipe 140 from the lower part of the auxiliary tank 250. [

The auxiliary tank level controller 260 receives the signal detected from the auxiliary tank level sensor 251 and controls the opening and closing of the steam supply valve 252a to supply or block the steam S into the auxiliary tank 251 .

Referring again to FIG. 2, the construction of the drying unit 300 in the present embodiment will be described in detail.

The drying unit 300 of the present embodiment selects either one of the steam S supplied from the main engine 110 and the waste steam S 'supplied from the waste-steam recovery unit 200, It can be utilized.

The drying unit 300 includes a drying chamber 301, a blower 305 for circulating air in the drying chamber, a duct 303 for providing a flow path of air circulated by the blower 305, And a heating means for heating the air circulated by the heating means to make hot air. The heating means includes a steam heat source supply unit 310 that uses the steam S as a heat source and a waste steam heat source supply unit 320 that uses the waste steam S 'as a heat source.

The steam heat source supply unit 310 includes a first heater 315, a temperature control valve 311, a first sensor 313, and a first trap 317. And may further include a temperature control valve controller 319. [

 The first heater 315 heats the drying chamber 301 air using the steam S as a heating heat source. The temperature control valve 311 is installed in the main engine 110 connected to the first heater 315. The first sensor 313 is installed in the drying chamber 301 to detect the temperature inside the drying chamber.

The first trap 317 is a trap which is discharged after the steam S heated by the first heater 315 turns into condensed water.

The temperature control valve controller 319 controls the opening and closing of the temperature control valve 311 by receiving a temperature signal from the inside of the drying chamber 301 sensed by the first sensor 313, S).

The waste steam heat source supply unit 320 includes a second heater 325, a temperature control valve 321, a second sensor 323, and a vacuum pump 327. And may further include a temperature control valve controller 329. [

The second heater 325 heats the drying chamber 301 air using the waste steam S 'as a heating heat source. The temperature control valve 321 is installed in the waste steam supply pipe 203 connected to the second heater 315. The second sensor 323 is installed in the drying chamber 301 to detect the temperature inside the drying chamber.

The vacuum pump 327 sucks the waste steam S 'from the waste-steam recovery tank 210 toward the second heater 325 and the second heater 325 removes the waste steam S' Condensate is drained.

The temperature control valve controller 329 controls the opening and closing of the temperature control valve 321 by receiving the temperature signal inside the drying chamber 301 sensed by the second sensor 323, (S ').

Hereinafter, with reference to Figs. 2 and 3, a manufacturing process of the foamed plastic molded article manufacturing apparatus according to the first embodiment of the present invention will be described.

In the molding machine 120 shown in Fig. 2, the one-way heating process during the heating process is performed as follows.

When the high temperature steam S is supplied through the main engine 110, the fixed side steam valves 121a and 121b are opened to heat the foamed plastic raw material filled in the molding machine 120 mold. The steam S after the heating operation becomes condensed water or pulmonary steam S 'and is discharged toward the movable side exhaust valves 127a and 127b. During the one-way heating process, the movable side steam valves 123a and 123b and the fixed side exhaust valves 125a and 125b are kept closed.

When the raw material is expanded polystyrene, the pressure of the steam S normally put in the one-way heating process is about 0.3 MPa. If the inner pressure of each of the molding machines 120a and 120b reaches a predetermined pressure (for example, 0.07 MPa), the supply of the steam S is stopped. The supply time of the preferable steam S is about 10 to 20 seconds. However, such time conditions may vary depending on the thickness and shape of the product.

When the raw material is foamed polypropylene, the pressure of the steam S injected into the foamed polystyrene can be increased to about 0.6 to 0.7 MPa, and the pressure within the molding machines 120a and 120b can be increased up to 0.3 MPa .

The reverse heating process during the heating process is performed in reverse to the one-way heating process described above. That is, when the high-temperature steam S is supplied through the main engine 110, the movable side steam valves 123a and 123b are opened for about 3 to 7 seconds to heat the foamed plastic raw material filled in the molding machine 120 do. The steam S having undergone the heating operation becomes condensed water or pulmonary steam S 'and is discharged toward the fixed side exhaust valves 125a and 125b. During this process, the fixed-side steam valves 121a and 121b and the movable-side exhaust valves 127a and 127b are kept closed.

The double-sided heating process is performed as follows.

Side exhaust valves 125a and 125b and the movable side exhaust valves 127a and 127b are closed and the fixed side steam valves 121a and 121b and the movable side steam valves 123a and 123b are closed when the one- 123b open for a short period of time of about 1 to 2 seconds to heat the surface of the foamed plastic article. The steam S after the heating operation becomes condensed water or pulmonary steam S 'and is discharged toward the fixed side exhaust valves 125a and 125b and the movable side exhaust valves 127a and 127b.

After the heating process is completed, the mold of the molding machine 120 is cooled and the mold is opened to separate the foamed plastic molded article and transfer it to the drying chamber.

Conventionally, the condensed water and the pulmonary steam S 'discharged from each of the molding machines 120 in the heating process are discarded through the collector pipe 140.

However, in the present invention, the waste steam S 'discharged from the molding machine 120 is discharged through the pipe branched from the molding machine 120 and the exhaust valves 125a, 125b, 127a and 127b, that is, the waste steam inlet pipe 201 And recovered by the waste steam recovery unit 200 to be used as a drying room heating source.

To this end, in the present invention, when the steam S introduced into the molding machine 120 is discharged after completing the one-direction heating process and / or the backward heating process, the waste steam S ' And 60% to 70% of the total amount is recovered to the waste vapor recovery unit 200. If necessary, waste steam discharged after the double-sided heating process can also be collected and used.

The pulmonary steam exhaust valve 130, which is opened to collect the pulmonary steam, is an exhaust valve on the pipe through which the pulmonary steam is discharged according to each heating process.

The recovered pulmonary steam S 'is collected by the pulmonary steam recovery unit 200 and then discharged at a predetermined pressure to be used as a heat source for heating the drying unit 300.

Referring to FIG. 3, the operation of the waste-steam recovery unit 200 will be described.

The waste steam S 'drawn into the waste-steam recovery tank 210 through the waste-steam inlet pipe 201 passes through the water-separation plate 211, and water contained therein is filtered. The filtered water (condensed water) drops to the lower portion of the waste vapor recovery tank 210 and is discharged to the outside of the waste vapor recovery tank 210. If the contaminated state of the condensed water is not bad, it can be recycled as the water supply of the boiler.

The pressure control pipe 220 is filled with water at a lower portion of the U-shaped pipe in accordance with a permissible pressure of the waste steam in the waste vapor recovery tank 210. Accordingly, when the pressure of the pulmonary steam S 'filtered by the pulmonary steam recovery tank 210 is equal to or lower than the pressure set by the pressure control pipe 220, the pulmonary steam S' is upwardly directed to the pulmonary steam supply pipe 203, And then goes to the drying unit 300.

If the pressure of the pulmonary steam S 'inside the pulmonary steam recovery tank 210 becomes higher than the set pressure of the pressure control pipe 220, the water contained in the pressure control pipe 220 is pressurized by the pressure of the pulmonary steam S' And is pushed up toward the expansion tank 230.

At this time, the installation height of the first expansion tank is set to 3,000 mm, the back pressure of the corresponding pulmonary steam is set to 0.03 MPa, the installation height of the second expansion tank is set to 2,000 mm, and the corresponding pulmonary steam Is set to 0.02 MPa.

In this state, if the pressure of the pulmonary steam S 'inside the waste-steam recovery tank 210, that is, the pressure of the pressure control pipe 220 is limited to 0.02 MPa, the second expansion tank valve 231b is opened.

The sealed water pushed up from the pressure control pipe 220 by the high pressure pulmonary steam S 'flows into the second expansion tank 230b and then the high pressure pulmonary steam S' also flows into the second expansion tank 230b And can be discharged to the discharge connection pipe 233 through the discharge port 232b, so that the set pressure can be maintained at 0.02 MPa. Of course, at this time, a part of the high-pressure pulmonary steam S 'will be discharged through the discharge port 232a of the first expansion tank 230a.

If the pressure of the pulmonary steam S 'inside the pulmonary steam recovery tank 210, that is, the set pressure of the pressure control pipe 220 is limited to 0.03 MPa, the second expansion tank valve 231b is closed, The sealed water pushed up from the pressure control pipe 220 by the steam S 'flows into the first expansion tank 230b. Accordingly, since the high-pressure pulmonary steam S 'flows into the first expansion tank 230a and then flows out through the discharge port 232a to the discharge connection pipe 233, the set pressure 0.03 MPa can be maintained.

At this time, the first expansion tank 230a is installed so that the discharge port 232a protrudes into the expansion tank. This is because the sealed water of the pressure control pipe 220 flowing into the first expansion tank 230a flows through the discharge port 232a So as to prevent leakage to the outside.

After discharging the high-pressure pulmonary steam S ', the internal pressure of the pulmonary steam recovery tank 210 is lowered. When the internal pressure of the waste-steam recovery tank 210 drops to such an extent that the dropping of the sealed water that has been pushed up into the expansion tank 230 can not be prevented, the sealed water flows back to the U-shaped bottom of the pressure control pipe 220, do.

On the other hand, as described above, a part of the sealed water of the pressure control pipe 220 pushed up by the expansion tank for relieving overpressure in the waste steam recovery tank 210 leaks to the outside through the discharge port 232a or the discharge port 232b A case occurs. In addition, the number of enclosures may be reduced by evaporation during operation of the apparatus.

In this case, the water level of the water enclosed in the lower end of the pressure control pipe 220 in the pressure control pipe level sensor 221 equipped with the electrode rod or the McDonnell switch may be detected to be less than a predetermined value. The sensed signal is transmitted to the pressure regulating pipe level controller 240.

Then, the pressure control pipe level controller 240 applies a control signal to the sealed water supply valve 231a. In response to the applied control signal, the sealed water supply valve 231a is opened so that the external sealed water W is added Is spread. In this way, the water enclosed in the pressure regulating tube 220 can be maintained at a certain level.

In the present embodiment, a configuration is described in which the number of enclosures is automatically supplied using the pressure control pipe level sensor 221 and the pressure control pipe level controller 240 as described above, but this is not an essential component. That is, a water level meter (not shown) is installed in the pressure control pipe 220 in place of the pressure control pipe level sensor 221 to determine whether the sealed water is insufficient by the naked eye and manually open the sealed water supply valve 231a, (W) may be additionally provided.

The drying process occurring in the drying unit 300 will be described with reference to FIG.

When the blower 305 is operated, air in the drying chamber 301 is sucked into the duct and passes through the second heater 325 and the first heater 315. In this process, the air is heated by the second heater 325 and / or the first heater 315 to be hot air H. The hot air H is supplied to the inside of the drying chamber 301 via the duct 303 to dry the foamed plastic products loaded in the drying chamber.

In particular, the embodiment of FIG. 2 of the present invention utilizes the waste steam S 'discharged from the waste steam recovery unit 200 as a heat source for heat of the second heater 325 of the drying unit 300. At this time, the negative pressure generated by the vacuum pump 327 is used as a driving force to suck the waste steam S 'toward the second heater 325.

 Since the first heater 315 uses the steam S of high temperature and high pressure supplied from the main engine 110 as a heat source of heat, a separate driving source for sucking the steam S toward the first heater 315 is required not

The heating temperature control of the first heater and the second heater is performed by controlling the supply of the steam S or the waste steam S 'by opening and closing the temperature control valve 311 and the temperature control valve 321, respectively.

The opening and closing of the temperature control valve 311 and the temperature control valve 321 are controlled by the temperature control valve controller 319 which receives the temperature signal in the drying chamber 301 sensed by the first sensor 313 and the second sensor 323, , 329).

The steam (S) or the pulmonary steam (S '), which has completed its function as a heat source of heat, may be mixed with condensed water and steam and discharged through the collecting pipe (140).

The operation of the auxiliary tank 250 will be described with reference to FIGS.

In this embodiment, the vapor S 'of the waste vapor recovery tank 210 is sucked toward the second heater 325 along the waste vapor supply pipe 203 by the negative pressure generated by the vacuum pump 327.

However, if the negative pressure is excessively generated by the vacuum pump 327, the inside of the waste-steam recovery tank 210 may also be in a negative pressure state along the waste-steam supply pipe 203. In this state, the condensed water accumulated in the lower portion of the waste steam recovery tank 210 can not be discharged to the outside along the discharge water discharge pipe, and the water level continuously rises. As a result, the condensed water may flow back to the waste steam inlet pipe 201 have.

In order to solve such a problem, an auxiliary tank 250 is used in the present invention. The lower part of the auxiliary tank 250 and the lower part of the waste vapor recovery tank 210 are connected to the upper part of the auxiliary tank 250 and the upper part of the waste vapor recovery tank 210 by the condensate discharge pipe 273, Respectively.

The condensate discharge valve 252c of the condensed water discharge pipe 273 and the steam shutoff valve 252b of the communication pipe 112 maintain the open mode and the steam supply valve 252a provided in the high pressure gas supply pipe 111 And the condensate discharge valve 252d provided in the condensate discharge pipe 273 connected to the collector pipe 140 from the lower portion of the auxiliary tank 250 maintain the closed mode.

Therefore, in such a normal operation state, the water level of the condensed water remaining in the lower part of the auxiliary tank 250 and the waste steam recovery tank 210 gradually increases while being kept the same in both the tanks. At this time, the auxiliary tank water level sensor 251, When it is detected that the water level has been reached, the water level of both tanks can be lowered by opening the condensate discharge valve 252d to discharge the condensed water.

However, if a negative pressure is generated in the waste-steam recovery tank 210, a negative pressure is also generated in the auxiliary tank 250 communicated with the communication pipe 112. As a result, the condensed water remaining in the lower portions of both tanks opens the condensate discharge valve 252d Is not discharged properly.

Accordingly, in the present invention, when it is detected that the auxiliary tank level sensor 251 has reached the preset limit level, the auxiliary tank level controller 260, which receives the signal detected by the auxiliary tank level controller 260, 252c and the steam shutoff valve 252b to the closed mode and the steam supply valve 252a and the condensate discharge valve 252d are switched to the open mode and then the high pressure gas supply pipe 111 is connected to the auxiliary tank 250 And the condensed water accumulated in the lower portion of the auxiliary tank 250 can be forced to be discharged to the collecting pipe 140 along the condensed water discharge pipe 273 by supplying the high pressure steam S.

When the water level in the auxiliary tank is lowered by this action, the auxiliary tank level sensor 251 again transmits the detection signal for the lower level to the auxiliary tank level controller 260, And switches the valves 252c, 252b, 252a, and 252d to the mode in the normal operation state. The condensed water accumulated in the lower portion of the waste steam recovery tank 210 is partially moved to the auxiliary tank 250 along the condensate discharge pipe 273 so that the water level of the waste steam recovery tank 210 can be lowered do.

In the first embodiment, the high-pressure steam S is supplied to the lower portion of the auxiliary tank 250 for the forced discharge of the condensed water. However, in place of the high-pressure steam, another high-pressure gas such as high- Embodiments may also be considered.

[Example 2]

Fig. 4 schematically shows a configuration of a foamed plastic molded article manufacturing apparatus according to a second embodiment of the present invention.

The second embodiment of the present invention is a configuration including the pre-foamed foamed part 400 using the configuration of the second embodiment as it is. Example 2 is a more suitable apparatus for producing a foamed plastic molded article, particularly when polystyrene is used as a raw material.

The pre-foamable sealing part 400 of the second embodiment is constituted by the pre-blasting machine 410, the temperature control valves 431 and 432 and the second trap 417. [ And may further include temperature control valve controllers 419 and 429. [ The prefoamer may be divided into a direct prefilter 410a and an indirect prefilter 410b and may be selectively installed as required. In the second embodiment, a case where both are installed will be described.

The direct prefilter 410a includes an ejector 440 and a main engine 110 which suck the pulmonary steam S 'supplied from the pulmonary steam recovery and supply unit and inject the steam S together with the steam S supplied from the main engine 110, And a third sensor 413 for directly injecting steam (S) supplied from the first sensor 413 and the third sensor 413.

The indirect prefilter 410b includes a heat exchanger 450 and a fourth sensor 423 for passing the steam S supplied from the main engine 110 and performing heat exchange inside the vaporizer.

Referring to FIG. 4, the pre-foaming process occurring in the pre-foamed bore unit 400 will be described.

The process of the indirect pre-evaporator 410b is as follows. The indirect plasticizer 410b is filled with the raw foamed plastic material and the steam S supplied from the steam supply pipe 114 branched from the main engine 110 is supplied to the heat exchanger 450 of the indirect pre- . Accordingly, the inside of the indirect pre-evaporator 410b can be gradually heated to foam the charged foamed plastic raw material at a required magnification. The steam S passing through the heat exchanger 450 is discharged into the second trap as condensed water and waste steam.

The fourth sensor 423 detects the temperature inside the indirect pre-blasting device 410b and transmits a detection signal to the temperature control valve controller 429. [ The temperature control valve controller 429 controls the temperature control valve 432 to control the amount of the steam S supplied from the steam supply pipe 114 .

The process of the direct pre-evaporator 410a is as follows.

First, the foamed plastic raw material is directly charged into the pre-fusing unit 410b. When the high pressure steam S is introduced into the driving portion of the ejector 440 from the steam supply pipe 113 branched from the main engine 110, the steam S is injected at a high speed toward the ejector outlet, Low pressure is formed.

At this time, since the ejector 440 is connected to the suction port of the ejector by the pulmonary steam suction pipe 205 branched from the pulmonary steam supply pipe 203 connected to the pulmonary steam recovery tank 210, The steam S 'is sucked and mixed in the steam S which is injected at high speed through the ejector pulmonary steam intake pipe 205. The mixed steam S and the pulmonary steam S 'are discharged from the ejector outlet directly into the pre-boiler 410a.

Accordingly, the inside of the preliminary blower 410a is gradually heated, and the filled foamed plastic raw material can be foamed at a required magnification.

The inside of the preliminary blower 410a may be directly heated by directly injecting the steam S supplied from the secondary steam pipe 110 by using the steam injection port 441 connected to the steam supply pipe 114 as the case may be.

The third sensor 413 detects the temperature inside the preliminary blower 410a directly and transmits a detection signal to the temperature control valve controller 419. [ The temperature control valve controller 419 controls the temperature control valve 431 to control the amount of the steam S supplied from the steam supply pipe 113 .

The check valve 433 provided in the ejector pulmonary steam suction pipe 205 is a device for preventing steam from flowing backward from the suction port of the ejector 440 when a negative pressure is generated in the waste steam recovery tank 210.

The foamed plastic raw material preliminarily foamed in the preliminary foaming resin part (400) is transferred to a molding machine and subjected to foam molding processing.

It is to be understood that the disclosed embodiments are to be considered in an illustrative rather than a restrictive sense and that the true scope of the invention is indicated by the appended claims rather than by the foregoing description and all differences within the scope of equivalents thereof, .

S: steam S ': pulmonary steam
W: Number of enclosures
100: Molded plastic foam manufacturing equipment
110: main combustion engine 111: high pressure gas supply pipe
112: communication piping 113, 114: steam supply pipe
120: Molding machine
121a, 121b: fixed-side steam valves 123a, 123b: movable-side steam valve
125a, 125b: fixed side exhaust valves 127a, 127b: movable side exhaust valves
130: Waste steam exhaust valve 140: House water pipe
200: waste steam recovery unit
201: waste steam inlet pipe 203: waste steam supply pipe
205: Waste steam suction pipe for ejector 210: Waste vapor recovery tank
211: nipple separation plate 220: pressure regulating pipe
221: Pressure regulating pipe level sensor 222: Check valve
230: expansion tank 230a: first expansion tank
230b: a second expansion tank 231a: a sealed water supply valve
231b: second expansion tank valve 232a, 232b:
233: exhaust connection pipe 240: pressure control pipe level controller
250: auxiliary tank 251: auxiliary tank water level sensor
252a: steam supply valve 252b: steam shutoff valve
252c, 252d: condensate discharge valve 260: auxiliary tank level controller
273: Condensate discharge pipe
300:
301: drying chamber 303: duct
305: blower 310: steam heat source supply unit
311: Temperature control valve 313: First sensor
315: first heater 317: first trap
319: Temperature control valve controller 320: Waste steam heat source supply unit
321: Temperature control valve 323: Second sensor
325: second heater 327: vacuum pump
329: Thermostatic valve controller
400:
410: pre-pelletizer 410a: direct pre-pelletizer
410b: Indirect prefilter 413: Third sensor
423: fourth sensor 417: second trap
419, 429: Temperature control valve controller 431, 432: Temperature control valve
433: Check valve 440: Ejector
441: Steam nozzle 450: Heat exchanger

Claims (5)

And a drying process section which can use the waste steam supplied from the waste vapor recovery section as a heat source for heating, the process comprising: a molding machine for molding a foamed plastic article using steam; a waste steam recovery section for recovering the waste steam discharged from the molding machine; In a plastic molded article manufacturing apparatus,
The waste-vapor recovery unit 200 includes:
A waste vapor recovery tank 210 connected to the molding machine 120 and the waste steam inlet pipe 201 and connected to the drying agent 300 and the waste steam supply pipe 203;
The condensed water can be communicated with each other by the waste steam recovery tank 210 and the condensed water discharge pipe 273 and can communicate with each other by the waste steam recovery tank 210 and the communication pipe 112, An auxiliary tank 250 having a high-pressure gas supply pipe 111 for supplying high-pressure gas to the upper portion thereof; Wherein the energy-saving foamed plastic molded article manufacturing apparatus further comprises:
The method according to claim 1,
Further comprising a pressure control pipe (220) connected at one end to the upper portion of the waste vapor recovery tank (210) and connected to the expansion tank (230) at the other end.
The method of claim 2,
Wherein a plurality of the expansion tanks (230) are installed in correspondence with the height corresponding to the set pressure of the pressure control pipe (220).
The method according to claim 1,
The drying unit 300 includes:
A drying chamber 301
A duct 303 through which the air in the drying chamber circulates; And
And heating means for heating the circulated air to generate hot air,
Wherein the heating means comprises a steam heat source supply unit 310 that uses steam S as a heat source and a pulmonary steam heat source supply unit 320 that uses pulmonary steam S 'as a heating heat source. Manufacturing apparatus.
The method according to claim 1,
Further comprising a pre-foamer (400) having a direct pre-booster (410a) for injecting the waste steam (S ') supplied from the waste-steam recovery unit (200).

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