JP2000218647A - Device for supplying forming agent to resin foam molding machine and manufacture of resin foam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foaming agent supply device for a resin foam molding machine which is capable of supplying a specified amount of forming agent which is nonflammable like a liquefied carbon dioxide gas or a liquefied nitrogen gas and noes not destruct an ozone layer and further, is not much detrimental to a global atmospheric temperature, in a stable condition. SOLUTION: This foaming agent supply device comprises a forming agent storage tank 1 which is filled with a foaming agent 2 such as a liquefied carbon dioxide gas and a liquefied nitrogen gas, a foaming agent supply pipe 5 which supplies the foaming agent 2 to a resin foam molding machine 6 from the foaming agent storage tank 1 and a pump 7 interposed in a region, to the resin foam molding machine 6 side, of the foaming agent supply pipe 5. In this case, a cooler 8 which cools the foaming agent 2 passing through the foaming agent supply pipe 5 located in the upstream part of the pump 7 is a constituent of the foaming agent supply device 10 for the resin foam molding machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supplying a foaming agent such as liquefied carbon dioxide gas or liquefied nitrogen gas to a resin foam molding machine and a method for producing a resin foam.

[0002]

2. Description of the Related Art Conventionally, a foaming agent used in a resin foam molding machine is excellent in quantitative and stable supply to a resin foam molding machine and has a high solubility in a resin, such as a hydrocarbon-based gas (butane gas, pentane gas, isobutane gas). Gas, heptane, ethane, propane, pentane, etc.) and alternative Freon gas.

[0003]

When a conventional hydrocarbon gas or alternative chlorofluorocarbon gas is used as a foaming agent, there is a disadvantage that the risk of gas explosion is great, and there is a problem of destruction of the ozone layer. And problems such as global warming have occurred, and it has become a social problem to continue using it. For this reason,
It is considered that carbon dioxide or nitrogen gas is used as a blowing agent because it is nonflammable and has no effect on the ozone layer and has little effect on global warming. Further, there is a drawback that it cannot be supplied even in a stable state.

The present invention has been made in view of the above-mentioned conventional drawbacks,
A blowing agent that is non-flammable of liquefied carbon dioxide and liquefied nitrogen gas and does not destroy the ozone layer and has little impact on global warming,
It is an object of the present invention to provide an apparatus for supplying a foaming agent to a resin foam molding machine that can supply the foaming agent to the resin foam molding machine in a fixed and stable state.

The above and other objects and novel features of the present invention will become more completely apparent when the following description is read in conjunction with the accompanying drawings. However, the drawings are for explanation only, and do not limit the technical scope of the present invention.

[0006]

In order to achieve the above object, the present invention relates to a foaming agent filled tank filled with a foaming agent such as liquefied carbon dioxide gas or liquefied nitrogen gas, and a foaming agent in the foaming agent filled tank. In a foaming agent supply pipe for supplying to a resin foam molding machine, and a foaming agent supply device for a resin foam molding machine comprising a pump interposed at a portion of the foaming agent supply pipe near the resin foam molding machine, A cooling agent for cooling the foaming agent passing through the foaming agent supply pipe upstream of the pump constitutes a device for supplying the foaming agent to the resin foam molding machine.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

In the first embodiment of the present invention shown in FIGS. 1 and 2, reference numeral 1 denotes a foaming agent filling tank filled with a foaming agent 2 of liquefied carbon dioxide gas. A filling pipe 4 for filling the foaming agent 2 with a flow control valve 3 interposed is attached.

5 is a foaming agent 2 in the foaming agent filling tank 1
Is supplied from the lower part of the foaming agent filling tank 1 to the resin foam molding machine 6 by using a foaming agent supply pipe 5.
The resin foam molding machine 6 to which the foaming agent 2 is supplied is a generally used molding machine, an extruder for extruded gas foaming, a pressure vessel for bead foaming, a mixer for urethane foaming, and the like.

Reference numeral 7 denotes a resin foam molding machine 6 interposed at a portion of the foaming agent supply pipe 5 near the resin foam molding machine 6.
Is a pump for supplying the foaming agent 2 at a predetermined pressure.

A cooler 8 cools the blowing agent 2 passing through the blowing agent supply pipe 5 upstream of the pump 7 so as to supply the blowing agent 2 quantitatively and stably. The cooler 8 circulates a refrigerant from a refrigerator 9. What is cooled by being used is used.

The apparatus 10 for supplying a blowing agent to the resin foam molding machine having the above-described structure is configured to cool the blowing agent 2 passing through the blowing agent supply pipe 5 by the cooler 8 upstream of the pump 7 so as to prevent vaporization. And supplied to the resin foam molding machine 6 by the pump 7. For this reason, the foaming agent supply pipe 5 from the pump 7 to the resin foam molding machine 6 and the vaporization of the foaming agent 2 in the pump 7 are efficiently prevented, and the foaming agent 2 is supplied to the resin foam molding machine 6 in a quantitatively stable state. be able to. It is more efficient to cover the foaming agent supply pipe 5, the pump 7, and the cooler 8 with a heat insulating material and perform heat insulation treatment.

[0013]

Next, different embodiments of the present invention shown in FIGS. 3 to 16 will be described. In addition,
In the description of the different embodiments of the present invention, the same components as those of the first embodiment of the present invention are denoted by the same reference numerals, and duplicate description will be omitted.

The second embodiment of the present invention shown in FIGS. 3 and 4 mainly differs from the first embodiment of the present invention in that a cooler 8A which can also cool the pump head 7a is provided. When the blowing agent is at a low temperature below room temperature, the blowing agent supply pipe 5 is covered with a heat insulating material 11 and heat-insulated, so that the foaming agent supply device 10A to the resin foam molding machine thus configured is used. Even with this, the same operation and effect as those of the first embodiment of the present invention can be obtained, and the foam material can be more stably supplied in a quantitative manner.

The third embodiment of the present invention shown in FIGS. 5 and 6 is mainly different from the first embodiment of the present invention in that the blowing agent supply pipe 5 downstream of the pump 7 A return valve 13 having a control valve 12 or a control valve and a bypass valve communicating with the agent filling tank 1 is provided, and a cooler 14 is provided in the return passage 13 to prevent a heat load on the foaming agent filling tank 1. In view of the point that the apparatus can be supplied, the apparatus 10 for supplying the foaming agent to the resin foam molding machine thus configured
By setting B, it is possible to cope with an operation mode of an intermittent operation, a standby operation, and a pressure securing, and as a result, a blowing agent can be stably supplied. Also in the embodiment of the present invention, it is more efficient to cover the foaming agent supply pipe 5, the pump 7, the cooler 8, the refrigerator 9, the control valve 12, the return passage 13, and the cooler 14 with a heat insulating material and perform a heat insulating treatment. It is.

The fourth embodiment of the present invention shown in FIGS. 7 and 8 is mainly different from the third embodiment of the present invention in that the return passage 13A is provided with the blowing agent filled tank 1 and the cooler. 8 and the foaming agent supply pipe 5 between
The same operation and effect as those of the third embodiment of the present invention can be obtained also in the foaming material supply apparatus 10C to the resin foam molding machine configured as described above.

The fifth embodiment of the present invention shown in FIGS. 9 and 10 is different from the second embodiment of the present invention mainly in that a resin for a foaming agent supply pipe 5 downstream of a pump 7 is provided. Resin foam molding configured in this manner is provided with a heat exchanger 15 for cooling or heating to a single phase of a liquid phase, a gas phase, or a supercritical phase at a portion near the foam molding machine 6. By using the blowing agent supply device 10D to the machine, the blowing agent 2 can be more reliably and stably supplied to the resin foam molding machine 6.

The sixth embodiment of the present invention shown in FIGS. 11 and 12 is mainly different from the second embodiment of the present invention in that a blowing agent supply pipe 5 upstream of a cooler 8 is provided. Flow meter 16, and a refrigerator 18 upstream of the flow meter 16.
Thus, the flowmeter 1 is provided in that a cooler 17 using
By providing a refrigerator 18 at the upstream of the foaming agent supply device 10E to the resin foam molding machine that cools the foaming agent by providing the refrigerator 18, the accuracy of the flow meter 16 can be further improved, and the Quantitative supply can be made possible. Although the refrigerators 9 and 18 of the coolers 8 and 17 are shown separately, the present invention is not limited to this, and the refrigerators 8 and 17 may be cooled by one refrigerator 9.

The seventh embodiment of the present invention shown in FIGS. 13 and 14 is mainly different from the first embodiment of the present invention in that a foaming agent supply pipe 5A and a foaming agent filling tank 19 are used. In addition to allowing the vaporized foaming agent 2A to be supplied to the resin foam molding machine 6, at least one or more pressure reducing valves 20, 21 in the embodiment of the present invention, and the two pressure reducing valves 20, 21 in the foaming agent supply pipe 5A, In the point that heaters 22 and 23 for heating the vaporized foaming agent 2A by the pressure reduction rate of the pressure reducing valves 20 and 21 are provided downstream of the pressure reducing valves 20 and 21, the blowing agent is supplied to the resin foam molding machine configured as described above. By providing the supply device 10F, it is possible to prevent the temperature from being reduced by the decompression rate, to stably supply the temperature, and to further control the temperature of the vaporized foaming agent 2A. If you were, it is possible to obtain a more uniform and stable product.

The eighth embodiment of the present invention shown in FIGS. 15 and 16 is mainly different from the seventh embodiment of the present invention in that a pressure reducing valve 20 is connected to a blowing agent supply pipe 5A.
Heater 2 for preventing the influence of ambient temperature on heater 22, flow control valve 24 and blowing agent supply pipe 5A
In the point that 5 is provided, the foaming agent supply device 10G to the resin foam molding machine configured as described above can provide the same operation and effect as the seventh embodiment of the present invention, and
The flow rate accuracy can be improved.

In each of the above embodiments of the present invention, the case where liquefied carbon dioxide gas or vaporized carbon dioxide gas is used as the foaming agent has been described. However, the present invention is not limited to this. It is possible to use a gas that does not destroy the gas and has little effect on global warming. Further, similar effects can be obtained by using a cylinder for the foaming agent filling tank 1 used in each of the embodiments of the present invention.

[0022]

As is clear from the above description, the following effects can be obtained in the present invention.

(1) A foaming agent filling tank filled with a foaming agent such as liquefied carbon dioxide gas or liquefied nitrogen gas, a foaming agent supply pipe for supplying the foaming agent in the foaming agent filling tank to a resin foam molding machine, In a device for supplying a foaming agent to a resin foam molding machine comprising a pump interposed at a portion of the foaming agent supply pipe close to the resin foam molding machine, foaming passing through the foaming agent supply pipe upstream of the pump is provided. A resin cooler is provided to cool the agent, which effectively prevents vaporization that hinders the stable supply of a blowing agent that does not destroy the ozone layer due to incombustibility such as liquefied carbon dioxide gas or liquefied nitrogen gas. The machine can be supplied stably. Therefore, since a foaming agent such as liquefied carbon dioxide gas or liquefied nitrogen gas can be quantitatively and stably supplied to the resin foam molding machine, a stable and uniform foam can be obtained as a result.

(2) According to (1), since a non-flammable foaming agent such as liquefied carbon dioxide gas or liquefied nitrogen gas which does not destroy the ozone layer is used, there is no fear of an explosion accident, etc. You can work safely.

(3) According to the above (1), resin foam molding can be performed using a gas that is nonflammable and does not destroy the ozone layer and has little effect on the environment against global warming.

(4) Claims 2 to 6 also apply to (1) to (3).
The same effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a first embodiment of the present invention.

FIG. 2 is a schematic plan view of the first embodiment of the present invention.

FIG. 3 is a schematic side view of a second embodiment of the present invention.

FIG. 4 is a schematic plan view of a second embodiment of the present invention.

FIG. 5 is a schematic side view of a third embodiment of the present invention.

FIG. 6 is a schematic plan view of a third embodiment of the present invention.

FIG. 7 is a schematic side view of a fourth embodiment of the present invention.

FIG. 8 is a schematic plan view of a fourth embodiment of the present invention.

FIG. 9 is a schematic side view of a fifth embodiment of the present invention.

FIG. 10 is a schematic plan view of a fifth embodiment of the present invention.

FIG. 11 is a schematic side view of a sixth embodiment of the present invention.

FIG. 12 is a schematic plan view of a sixth embodiment of the present invention.

FIG. 13 is a schematic side view of a seventh embodiment of the present invention.

FIG. 14 is a schematic plan view of a seventh embodiment of the present invention.

FIG. 15 is a schematic side view of an eighth embodiment of the present invention.

FIG. 16 is a schematic plan view of an eighth embodiment of the present invention.

[Explanation of symbols]

1: foaming agent filling tank, 2: foaming agent, 3: flow rate control valve, 4: filling pipe, 5, 5A: foaming agent supply pipe, 6: resin foam molding machine, 7: pump, 8, 8
A: cooler, 9: refrigerator, 10, 10A-10
G: apparatus for supplying a foaming agent to a resin foam molding machine, 11: heat insulating material, 12: control valve, 13, 13A: return passage, 14: cooler, 15: heat exchanger, 16: flow meter, 17: cooling Vessel, 18: refrigerator, 19:
Foaming agent filling tank, 20: pressure reducing valve, 21: pressure reducing valve,
22: heater, 23: heater, 2
4: Flow control valve, 25: heater.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryutaro Fujihira 3-2 Chidori-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Denko KK Kawasaki Research Institute (72) Inventor Kiyoshi Sudo 3 Misaki-cho, Chiyoda-ku, Tokyo No. 3-23 Showa Carbonate Co., Ltd. (72) Inventor Noboru Sawada 3-3-23 Misakicho, Chiyoda-ku, Tokyo F-term in Showa Carbonate Co., Ltd. 4F212 AG20 AK13 UA13 UF06 UF23 UF23 UL07 UN15

Claims (6)

[Claims] 1. A foaming agent filling tank filled with a foaming agent such as liquefied carbon dioxide gas or liquefied nitrogen gas, a foaming agent supply pipe for supplying the foaming agent in the foaming agent filling tank to a resin foam molding machine, And a pump interposed at a portion of the agent supply pipe close to the resin foam molding machine, wherein the foaming agent passes through the foaming agent supply pipe upstream of the pump. A supply device for a foaming agent to a resin foaming agent molding machine, comprising a cooler for cooling the foaming agent. 2. A foaming agent filling tank filled with a foaming agent such as liquefied carbon dioxide gas or liquefied nitrogen gas, a foaming agent supply pipe for supplying the foaming agent in the foaming agent filling tank to a resin foam molding machine, And a pump interposed at a portion of the agent supply pipe close to the resin foam molding machine, wherein the foaming agent passes through the foaming agent supply pipe upstream of the pump. A device for supplying a foaming material to a resin foaming agent molding machine, comprising a cooler for cooling the pump and cooling the pump head. 3. A foaming agent filling tank filled with a foaming agent such as liquefied carbon dioxide gas or liquefied nitrogen gas, a foaming agent supply pipe for supplying the foaming agent in the foaming agent filling tank to a resin foam molding machine. And a pump interposed at a portion of the agent supply pipe close to the resin foam molding machine, wherein the foaming agent passes through the foaming agent supply pipe upstream of the pump. And a return passage provided with a control valve for communicating the blowing agent supply pipe downstream of the pump with the blowing agent filling tank or the blowing agent supply pipe upstream of the cooler. And a foaming agent supply device for a resin foam molding machine. 4. A foaming agent filling tank filled with a foaming agent such as liquefied carbon dioxide gas or liquefied nitrogen gas, a foaming agent supply pipe for supplying the foaming agent in the foaming agent filling tank to a resin foam molding machine, In a supply device for a foaming agent to a resin foam molding machine comprising a pump interposed at a portion of the agent supply pipe near the resin foam molding machine, a foaming agent passing through a foaming agent supply pipe upstream of the pump is supplied. A cooling device for cooling is provided, and cooling or heating is performed at a portion of the foaming agent supply pipe downstream of the pump near the resin foaming machine so that the foaming agent can be supplied to the resin foaming machine in a single phase. An apparatus for supplying a foaming agent to a resin foam molding machine, comprising a heat exchanger. 5. A foaming agent filling tank filled with a foaming agent such as liquefied carbon dioxide gas or liquefied nitrogen gas, a foaming agent supply pipe for supplying the foaming agent in the foaming agent filling tank to a resin foam molding machine; In a device for supplying a foaming agent to a resin foam molding machine comprising a pump interposed at a portion of the agent supply pipe near the resin foam molding machine, a flow meter is provided in the foaming agent supply pipe upstream of the pump. An apparatus for supplying a foaming agent to a resin foam molding machine, further comprising an upstream cooler for cooling the foaming agent passing through the foaming agent supply pipe upstream of the flow meter. 6. A method for producing a resin foam, comprising using the apparatus for supplying a foaming agent to a resin foam molding machine according to claim 1 to produce a resin foam.