JP3445463B2 - Method and apparatus for foaming high viscosity material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for foaming a high-viscosity material, and is used, for example, for a field-molded gasket, filling voids and the like.

[0002]

2. Description of the Related Art FIG. 5 is a fluid circuit diagram of a conventional foaming apparatus 90 for high-viscosity materials. In FIG. 5, the storage can 91
The high-viscosity material accommodated in (1) is pumped by the primary pump 92 and sent to the power mixer 94. The high-pressure compressed gas filled in the high-pressure tank 93 is sent to the power mixer 94 after the pressure is adjusted.

The power mixer 94 is rotationally driven by a motor M and agitates the fed high viscosity material and gas under high pressure. The high-viscosity material stirred by the power mixer 94 is discharged from the nozzle 96 via the pipe 95. As the gas, nitrogen gas, carbon dioxide gas, air or the like is used.
Such a foaming device 90 is used as a device for applying a high-viscosity polymer material such as a hot melt adhesive (Japanese Patent Laid-Open No. 63-264327).

The hot melt adhesive contains a thermoplastic polymer which is a solid at room temperature as a component, and melts and flows when heated. On the other hand, when the hot melt adhesive is melted by heating and then cooled to room temperature, it becomes solid, and the adhesive strength and the strength of the lump of the adhesive are exhibited.
Conventional foaming devices for such hot melt adhesives utilize the property of rapidly developing strength after cooling before the gas mixed in the hot melt adhesive is dissipated,
Incorporates gas to form a foam.

[0005]

However, in the above-described conventional foaming apparatus 90, the high-viscosity material and gas must be heated and sent to the power mixer 94 or the upstream thereof at high pressure. For example, when the viscosity of the high-viscosity material is 100,000 cps, the internal pressure of the power mixer 94 is 100 kg / cm.
^Since it is considered that the pressure is ² or more, in order to send the gas to the power mixer 94 at the same time as the high-viscosity material, it is necessary to make the pressure higher than the pressure of the high-viscosity material.

When the gas pressure is high, it is difficult to control the flow rate, and a slight error in the flow rate at high pressure appears as a large error at atmospheric pressure. For example, the error of the flow rate at 50 kg / cm ² becomes 50 times larger at atmospheric pressure. The conventional foaming device 90 is
Since the amount of gas is measured by controlling the flow rate of gas, the difficulty in controlling the flow rate also causes a large variation in the mixing ratio of the high-viscosity material and gas, making the foaming state unstable and uniform. It is difficult to obtain proper foaming.

Also, a high-pressure tank 9 for supplying gas
3 is used, but maintenance is troublesome because the compressed gas in the high-pressure tank 93 must be replaced when it is empty. Since the replacement high-pressure tank 93 needs to be stored as a spare, the installation space for them is large. In addition, it is necessary to take various measures to ensure safety as stipulated in the regulation of high pressure gas control.
For these reasons, there is a cost disadvantage.

The present invention has been made in view of the above problems, and gas can be introduced into a high-viscosity material at a low pressure,
An object of the present invention is to provide a method and an apparatus for foaming a high-viscosity material that solves the conventional problems caused by using a high-pressure tank, such as easy maintenance, excellent safety, and cost advantage.

[0009]

According to a first aspect of the present invention, there is provided a first step of introducing a gas into a high-viscosity material, and the high-viscosity material and the gas delivered from the first step. A second step of pressurizing the mixture with a pump, and a third step of dispersing the gas in the high-viscosity material by passing the mixture in a pressurized state through a dispersion conduit.
And a fourth step of foaming by discharging the mixed material that has passed through the dispersion pipe line. In the first step, the piston reciprocates in the cylinder to perform a suction step. And a piston pump that performs a discharge process, and a membrane separation type gas generator that generates gas by supplying compressed air, and supplies low pressure gas generated by the membrane separation type gas generator to the piston pump. Gas is introduced into the high-viscosity material, for example batchwise. The introduction in batch mode means that the high-viscosity material and the gas are separately supplied.

In the method according to the second aspect of the present invention, nitrogen gas is generated by the membrane separation type gas generator and the generated nitrogen gas is used as the gas. The method according to the invention of claim 3 supplies gas into the cylinder in the suction step of the piston pump, supplies high viscosity material into the cylinder after the suction step, and supplies the high viscosity material. After the completion of the discharge process of the piston pump,
In the discharging step, the gas and the high-viscosity material are discharged into the conduit.

In the method according to the fourth aspect of the present invention, the mixing ratio of the gas and the high-viscosity material supplied to the cylinder of the piston pump is controlled by the ratio of the supply pressures thereof.

The method according to the invention of claim 5 controls the mixing ratio of the gas and the high-viscosity material by measuring the amount of the gas supplied to the cylinder of the piston pump by a gas flow meter.

According to a sixth aspect of the present invention, there is provided a high-viscosity pump for pressure-feeding a high- viscosity material, a suction step for reciprocating a piston in a cylinder to suck gas, and the suction step.
Introduce the high viscosity material from the high viscosity pump
Then , a piston pump for performing a discharge step of delivering a mixture of the high-viscosity material and the gas, and pressurization for pressurizing the mixture of the high-viscosity material and the gas delivered from the piston pump. A pump, a pipe for dispersion that disperses the gas in the high-viscosity material by passing the mixture under pressure, and a discharge for discharging the mixture that has passed through the pipe for dispersion. And a device.

High-viscosity materials include adhesives, sealing materials for filling gaps, coating materials, gasket materials for forming in-situ foam, and foam filling for filling voids.
Thermosetting materials, reaction curable materials, hot melt materials and the like can be mentioned. Either way, in the method and apparatus of the present invention,
It is desirable that it be cured or solidified immediately after the discharge foaming, and that cured or solidified in a state where gas is dispersed in a high-viscosity material.

As the gas, nitrogen gas, carbon dioxide gas, air or the like can be used. A long hose or pipe having a length of, for example, several meters to several tens of meters is used as a dispersion conduit for dispersing gas in a high-viscosity material. Such a hose or pipe is wound, for example, in a straight line shape, an arc shape, or a spiral shape, and is used as a dispersion conduit unit mounted on a frame for supporting the hose or pipe.
The mixture of the high-viscosity material and the gas passes through the dispersing pipe under pressure, whereby the gas is atomized by the shearing force and dispersed in the high-viscosity material.

The membrane separation type gas generator is 0.1 to 5 kg.
/ Cm ² range, preferably 0.1 to 3 Kg / c
A low pressure gas adjusted within a range of about m ² is supplied. The membrane separation type gas generator separates and generates gas in the air by utilizing the difference in gas permeation rate. The rate at which gas permeates the membrane depends on the solubility and diffusivity of gas molecules in the membrane. Nitrogen has the slowest membrane permeation rate among the components of air, and therefore has high separation efficiency. The membrane separation gas generator can continuously take out nitrogen gas by supplying compressed air.

[0017]

1 is a circuit diagram showing a part of a foaming apparatus 1 according to the present invention, FIG. 2 is a circuit diagram showing a remaining part of the foaming apparatus 1 according to the present invention, and FIG. 3 is a piston pump. 45A,
45B is a sectional front view showing the structure of 45B, and FIG. 4 is a timing chart for explaining the operation of the piston pumps 45A and 45B.

1 and 2, a foaming device 1 is a gas supply device 1 provided corresponding to the first step of the present invention.
0, high viscosity material supply device 11, and gas introduction device 12,
The pressure device 13 provided corresponding to the second step, the dispersion device 14 provided corresponding to the third step, the discharge device 15 provided corresponding to the fourth step, and the whole of It is composed of a control device 19 for controlling. Gas supply device 10, high-viscosity material supply device 11, and gas introduction device 12
The introducing and supplying device 5 is constituted by.

In FIG. 1, the gas supply device 10 has a structure of 0.
Within the range of about 1 to 5 kg / cm ² , preferably 0.1 to
A low-pressure gas adjusted within the range of about 3 Kg / cm ² is supplied. In the present embodiment, a known nitrogen gas generator (membrane separation gas generator) configured to separate and take out nitrogen gas by a membrane separation method by supplying compressed air is used. Such a gas supply device 10
For example, as shown in FIG. 1, it is composed of a port 31 that receives compressed air from a compressor, a filter 32, a membrane separation module 33, a pressure regulating valve 34, a gas flow meter 35, and the like.

The membrane separation module 33 separates and generates gas in the air by utilizing the difference in gas permeation rate. The rate at which gas permeates the membrane depends on the solubility and diffusivity of gas molecules in the membrane. Nitrogen has the slowest membrane permeation rate among the components of air, and therefore has high separation efficiency. In the membrane separation module 33 of this embodiment, water and oxygen having a high permeation rate are discharged to the outside of the membrane, and nitrogen having a low permeation rate is taken out as a gas. Normally, the pressure of the nitrogen gas output from the membrane separation module 33 is lower than the pressure of the input compressed air by about 0.5 to ¹ Kg / cm ² . As such a membrane separation module 33, for example, UT series manufactured by Taiyo Toyo Oxygen Co., Ltd. can be used.

When the membrane separation module 33 is used, nitrogen gas can be continuously taken out by supplying compressed air, and since the structure is simple and there are few failures, maintenance is extremely easy. Since there is no driving part, there is no vibration or noise. It is small and requires little installation space. A gas with low humidity can be stably supplied. The low pressure is safe and low cost.

The high-viscosity material supply device 11 delivers the high-viscosity material at a high pressure adjusted within the range of about 100 to 300 Kg / cm ² , preferably within the range of 150 to 250 Kg / cm ² . In this embodiment, a follower plate type plunger pump 42A is used as a pump for high-viscosity material pressure feeding. Plunger pump 42A
Presses the high-viscosity material MV filled in the storage canister with a plate driven by a cylinder device (not shown) and sends it to the conduit 39A.

The gas introducing device 12 is composed of two piston pumps 45A and 45B which operate alternately. In each piston pump 45A, 45B, the respective pistons are linearly reciprocally driven by motors M2A, M2B, which causes the pistons to reciprocate in the cylinder to perform a suction process and a discharge process. Piston pump 45A, 45B
Is interposed between the pipeline 39A and the pipeline 44A, and introduces the high-viscosity material MV pressure-fed from the high-viscosity material supply apparatus 11 and the gas delivered from the gas supply apparatus 10 at a predetermined ratio.

Next, the structures of the piston pumps 45A and 45B will be described. Since these structures are the same as each other, only one piston pump 45A will be described. Referring to FIGS. 1 and 3, a piston pump 45A
Is composed of a cylinder 451, a piston 452 that closely slides in the cylinder 451, and three needle valves NV1, NV3 and NV5 provided in the cylinder 451.

The needle valve NV5 is for discharge control,
It is provided at the stroke end of the discharge process in the piston pump 45A. The needle valve NV3 is for controlling gas supply, and is provided near the stroke end of the discharge process. The needle valve NV1 is for controlling the supply of the high-viscosity material MV, and is provided near the stroke end portion of the suction process.

These needle valves NV1, NV3, NV
5 have substantially the same structure as each other, the needle 453 is driven by a pneumatic cylinder to move in the axial direction, and the tip of the needle 453 opens and closes an opening 454 provided on the inner peripheral surface or the end surface of the cylinder 451. . The valve body is provided with a port 455 that communicates with the valve chamber.

When the needle valves NV1, NV3 and NV5 are closed, the tip of the needle 453 is flush with the inner peripheral surface or the end surface of the cylinder 451 and the piston 452.
The dead space between and is virtually zero. Therefore, when the needle valves NV1, NV3, and NV5 are closed, a part of the gas or the high-viscosity material supplied to the inside of the cylinder 451 is removed from the needle valves NV1 and NV1.
When the needle valve NV5 is opened and the discharging process is performed without entering and staying in the valve chambers of the NV3 and NV5, all of the gas and the high-viscosity material supplied to the inside of the cylinder 451 are discharged.

A check valve CV3 is provided in the pipe 39B.
4 and check valves CV5, 6 are provided in the pipeline 44A, respectively. The cylinder capacity (discharging capacity) of the piston pumps 45A and 45B is determined by the diameter of the piston 452 and the stroke (moving distance). In this embodiment, the piston 452 has a diameter of 16 mm, a stroke of 125 mm, and a capacity of 25 cc.

The control device 19 controls each piston pump 45.
Gas is supplied into the cylinders 451 of A and 45B in the suction process, the high-viscosity material MV is batch-supplied after the suction process, and the discharge process is performed after the supply of the high-viscosity material MV is completed to perform gas and high-viscosity The motors M1A, M2A, M2B and the needle valve N so as to discharge the material into the line 44A.
It controls V1, NV3, and NV5.

Next, the operation of the introduction and supply device 5 will be described.
Compressed air is supplied to the port 31 shown in FIG. 1, and the gas having the pressure set in the pressure adjusting valve 34 is supplied from the gas supply device 10 to the conduit 39B. The motor M1A is controlled, and the high-viscosity material MV having a predetermined high pressure is supplied from the high-viscosity material supply device 11 to the conduit 39A as necessary.

As shown in FIG. 4, in one of the piston pumps 45A and 45B, the piston 452 moves from the discharge end to the suction end to perform the suction process. During this time, the needle valve NV1 is opened after a time T1 has elapsed since the movement of the piston 452 was started, and gas is supplied. The time T1 is about 1 to 2 seconds, and the inside of the cylinder 451 becomes negative pressure during this time.

After the piston 452 reaches the suction end, the needle valve NV1 is closed after a while. Therefore,
When the suction process is completed, the inside of the cylinder 451 is filled with the gas having the adjusted pressure. The amount of gas sucked into the cylinder 451 in one suction step is measured by the gas flow meter 35, and if it is less than the set value, the controller 19 issues an alarm. As described above, the gas supply amount in the inhalation process is controlled by the control device 19
Being monitored by.

After the time T3 has elapsed since the needle valve NV1 was closed, the needle valve NV3 is opened. Time T3 is 0.
It takes about 1 to 0.5 seconds, which allows the needle valve NV
1 and NV3 are prevented from opening at the same time. During the time T4 when the needle valve NV3 is open, the high-viscosity material MV is supplied from the high-viscosity material supply device 11, and the cylinder 45
1 is filled inside. High viscosity materials have high pressure,
The low-pressure gas previously filled in the cylinder 451 is compressed at a rate equal to its pressure ratio, so that its volume becomes almost negligible.

For example, when the gas is 1 kg / cm ² and the high viscosity material is 200 kg / cm ² , the volume of the gas is about 1 / g.
It becomes 200. In this case, the high-viscosity material in an amount equal to the volume of the cylinder 451 and the same volume of 1 Kg / cm ² of gas are mixed. Note that the gas of 1 kg / cm ² having the same volume as that of the cylinder 451 is the same as the gas at atmospheric pressure which is twice the volume of the cylinder 451. That is, when the gas is converted into the atmospheric pressure, the gas and the high viscosity are against the pressure adjusted by the pressure adjusting valve 34 or the negative pressure (-1 Kg / cm ² ) displayed on the pressure gauge inside the piston pumps 45A and 45B. The mixing ratio R with the material is 2: 1. When the gas supply pressure is generalized to P1, the mixing ratio R becomes (P1 + 1): 1. That is, the mixing ratio R can be easily adjusted or controlled by adjusting the gas supply pressure P1.

Further, in a later step, when these gases and the high-viscosity material are mixed and dispersed and then discharged into the atmosphere to be foamed, the volume becomes 3 (= 1 + 2) times. Become. That is, the expansion ratio A in this case is "3".
When the gas supply pressure is represented by P1, the expansion ratio A is (P1 + 2).

After the time T5 has elapsed since the needle valve NV3 was closed, the needle valve NV5 is opened and the piston 45
2 moves from the suction end to the discharge end to perform the discharge process. The time T5 is within a range of about 0.1 to 0.5 seconds. During the discharging step, the needle valves NV1 and NV3 are closed, and the tip of the needle 453 is flush with the inner peripheral surface of the cylinder 451, so there is no dead space there and the cylinder 451 is filled. All of the gas and high-viscosity material are discharged from the opening 454 of the needle valve NV5. After the discharge process is completed and time T6 has elapsed, the next suction process is started. The time T6 is in the range of about 0.1 to 0.5 seconds.

One of the piston pumps 45A and 45B ends the discharging process and the other starts the discharging process.
As a result, the mixture is alternately discharged from the piston pumps 45A and 45B into the conduit 44A. The mixture is
In the conduit 44A, the high-viscosity material for one discharge process and the compressed gas are layered and are in a continuous state. Set the capacity of each piston pump 45A, 45B to 2
If it is made as small as about 5 cc, the mixed material in the conduit 44A will be in a pulsed state. By doing so, when the dispersion step is carried out later, the dispersion will be carried out better.

In FIG. 2, the pressurizing device 13 includes piston pumps 51A and 51B for pressurizing fluid by pistons linearly reciprocally driven by a motor, and open / close valves 52A and 52.
B, 53A, 53B, and pressure sensors 55A, 55B and the like. A mixer may be provided before and after the pressurizing device 13 if necessary.

For example, in the operation of the piston pump 51A, when the piston moves upward with the open / close valve 52A opened and the open / close valve 53A closed, the mixed material delivered through the pipe 48 is sucked into the cylinder. When the piston moves downward while the on-off valve 52A is closed and the on-off valve 53A is open, the mixed material in the cylinder is pushed out to be in a pressurized state. The pressure in the cylinder is detected by the pressure sensor 55A, and the detection signal is sent to the control device 19. The extrusion pressure from the piston pump 51A is 150 kg / cm.
² or more The motor that drives the piston is the control device 1
The rotation speed is controlled by the signal from 9, and the suction and extrusion of the piston pump 51A and the flow rate (extrusion amount) thereof are controlled by this.

The dispersion device 14 comprises a dispersion pipe line 61 and an opening / closing valve 65. The pipe line 61 for dispersion has an inner diameter of 8 to 10.
It is a hose having a length of about mm and a length of about 2 to 10 m. In the dispersion pipe 61, the pressure of the mixture is 150 kg /
cm ² or more, for example, 200 to 250 kg / cm ² , and the flow rate is about 200 cc / min. While the pressurized mixture flows through the dispersion conduit 61, the gas has an average diameter of 0.
It becomes as fine as about 01 mm and is dispersed in the high-viscosity material MV.

The pressure, inner diameter, and length inside the dispersion conduit 61 may be set according to the viscosity characteristics of the high-viscosity material MV, the specific gravity, and the required discharge amount. The discharge device 15 is for returning the mixed material sent from the dispersion device 14 to a normal pressure and discharging it to foam. The discharge device 15 includes a discharge pipe line 71, a discharge opening / closing valve 72, a nozzle 73, and the like.

The mixture sent from the dispersing device 14 is
When the discharge on-off valve 72 is open, a mixture of the high-viscosity material MV and gas is discharged from the nozzle 73, and when discharged, the gas expands and foams. By moving the nozzle 73 along a predetermined locus, the foamed high-viscosity material MV is applied or molded into a predetermined shape.

The controller 19 controls online a series of steps for discharging the high-viscosity material VM so that the foaming ratio A becomes a set value. The expansion ratio A is defined by the following formula.

Foaming ratio A = V ₁ / V ₀ where V _{1 is} the volume per unit mass of the high viscosity material after foaming (when open to the atmosphere) V _{0 is} the volume per unit mass of the high viscosity material before foaming In the device 1, the expansion ratio A can be set within a range of, for example, about 1 to 4. In the case of an in-situ foam molded gasket, it is usually set to an appropriate value in the range of 2-4.

According to the above-mentioned introducing / supplying device 5, the high-viscosity material MV and the gas can be mixed with the accurate mixing ratio R by a simple device. Therefore, in the foaming device 1, the foaming ratio A can be controlled with high accuracy.
Especially, since the dead space is substantially zero and the piston pumps 45A and 45B which can be ignored are used,
The volume is correct and therefore the mixing ratio R is correct. When the gas flow rate is measured to control the mixing ratio R, the flow rate is also measured, and the reliability of the accuracy of the mixing ratio R is improved.

Further, since a gas having a low pressure of about atmospheric pressure can be introduced into the high-viscosity material MV, it is possible to use a low-pressure output using the membrane separation module 33 as the gas supply device 10. Therefore, it is not necessary to use a tank filled with high-pressure gas, maintenance such as replacement of the tank is unnecessary, and the space is saved. Further, the gas flow rate can be accurately measured by the gas flow meter 35, and the operation of the piston pumps 45A and 45B can be monitored with high accuracy.

In the above-described embodiment, since the two piston pumps 45A and 45B are used, the discharge amount can be increased and continuous fixed amount discharge can be performed. Also, three or more piston pumps may be used instead of two. The plurality of piston pumps may be operated alternately or with a time difference. When two piston pumps are used, continuous discharge can be achieved by increasing the operating speed of the suction process with respect to the operating speed of the discharge process.

In the above-described embodiment, the gas can be made finer by circulating the mixture in the dispersion conduit 61 under pressure, and the dispersion efficiency is improved. Since the dispersion conduit 61 may be a hose having an appropriate inner diameter and length, maintenance is easy and cost reduction can be achieved.

Further, for example, when the discharge device 15 is attached to a robot and is constructed so as to be moved by a manipulator so as to draw a predetermined trajectory, the pressure device 13 and the discharge device 15 are connected by a pipe or a hose. In that case, by using a pipe or a hose having an appropriate length as the dispersion conduit 61, the dispersion conduit 61 can be
Can also be used for connection. The dispersion line 6
1 can be used in combination with a normal mixer such as a power mixer or a static mixer. These ordinary mixers may be provided in any of the first step, the second step, the third step, or the fourth step.

As the dispersion conduit 61, a pipe (dispersion conduit unit) formed by spirally winding a pipe having a predetermined inner diameter and length may be used. In that case, a pipe made of steel, for example, can be used. For example, if the nominal diameter is 3/8, the total length is 10 to 5 m, and if the nominal diameter is 1/4, the total length is 10 to 2 m.
It is a degree.

In the above-described embodiment, the dispersion conduit 61 is provided.
After, or after and before, a pressure regulating valve is provided, and the pipe 6 for dispersion is provided.
The pressure of the pressure adjusting valve may be adjusted so that the high-viscosity material MV in 1 is maintained at a high pressure. In that case, the front pressure adjusting valve is set to 150 to 350 kg / cm ² or more, and the rear pressure adjusting valve is set to about 50 to 250 kg / cm ² .

In addition, the configuration and shape of each part or the whole of the gas supply device 10, the introduction supply device 5 or the foaming devices 1 and 1b,
Dimensions, materials, quantities, capacities, operation timings, etc. can be appropriately changed other than those described above in accordance with the gist of the present invention.

[0053]

According to the present invention, the gas can be introduced into the high-viscosity material at a low pressure in a batch manner, the maintenance is easy, the safety is excellent, and the cost is advantageous. Moreover, the gas and the high-viscosity material can be introduced at an accurate mixing ratio, and the expansion ratio can be easily controlled.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a part of a foaming device according to the present invention.

FIG. 2 is a circuit diagram showing the remaining part of the foaming device according to the present invention.

FIG. 3 is a sectional front view showing the structure of a piston pump.

FIG. 4 is a timing chart for explaining the operation of the piston pump.

FIG. 5 is a fluid circuit diagram of a conventional high-viscosity material foaming device.

[Explanation of symbols]

1,1b Foaming device 10 Gas supply device (membrane separation gas generator) 11 High viscosity material feeder 12 Gas introduction device 13 Pressurizing device 14 Disperser 15 Discharge device 19 Control device 42A Plunger pump (high viscosity pump) 45A, 45B piston pump 51A, 51B Piston pump (pressurizing pump) 61 Dispersion pipeline 61A Dispersion pipeline unit (dispersion pipeline) 451 cylinder 452 piston VM High viscosity material

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaharu Takada 7-1 Akita-cho, Takatsuki-shi, Osaka Sunstar Giken Co., Ltd. (72) Yasuyuki Yoshimoto 7-1 Akita-cho, Takatsuki-shi, Osaka Sunstar Giken Co., Ltd. (56) Reference JP-A-6-198152 (JP, A) JP-A-50-159871 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B05B 7 / 00-7/32 B29C 67/20 B29K 105: 04

Claims (6)

(57) [Claims] 1. A first step of introducing a gas into a high-viscosity material, and a second step of pressurizing a mixture of the high-viscosity material and the gas delivered from the first step with a pump. A third step of dispersing the gas in the high-viscosity material by passing the mixture under pressure through a dispersion conduit, and discharging the mixture that has passed through the dispersion conduit A fourth step of foaming by causing the piston pump to perform a suction step and a discharge step by reciprocating the piston in the cylinder in the first step,
And a membrane-separating gas generator that generates gas by supplying compressed air, and supplies the low-pressure gas generated by the membrane-separating gas generator to the piston pump to introduce the gas into the high-viscosity material. A method for foaming a high-viscosity material, comprising: 2. The method for foaming a high-viscosity material according to claim 1, wherein nitrogen gas is generated by the membrane separation type gas generator and the generated nitrogen gas is used as the gas. 3. A gas is supplied into the cylinder in a suction step of the piston pump, a high viscosity material is supplied into the cylinder after the suction step, and the piston pump is supplied after the supply of the high viscosity material is completed. 3. The foaming method for a high-viscosity material according to claim 1, wherein the gas and the high-viscosity material are discharged into a pipe line in the discharging step. 4. The method for foaming a high-viscosity material according to claim 3, wherein the mixing ratio of the gas and the high-viscosity material supplied to the cylinder of the piston pump is controlled by the ratio of the supply pressures thereof. 5. The mixing ratio between the gas and the high-viscosity material is controlled by measuring the amount of the gas supplied to the cylinder of the piston pump with a gas flow meter. Foaming method for high viscosity materials. 6. A high-viscosity pump for pressure-feeding a high- viscosity material, and a suction pump for reciprocally moving a piston in a cylinder and sucking gas.
Before the high-viscosity pump following the inlet step and the inhalation step
The piston pump that performs a discharging step of delivering a mixture of the high-viscosity material and the gas after introducing the high-viscosity material, the high-viscosity material and the gas delivered from the piston pump. A pressurizing pump for pressurizing the mixture with, a pipe for dispersion that disperses the gas in the high-viscosity material by passing the mixture under pressure, and a pipe for dispersion A discharging device for discharging the mixed material, and a foaming device for a high-viscosity material, comprising: