JPH0661724B2 - Multi-tank type vacuum pressure impregnation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention modifies a porous material such as wood, cardboard, casting, ceramics, etc. by vacuum pressure impregnation of a predetermined chemical liquid. The present invention relates to a vacuum pressure impregnation apparatus used at that time, and particularly to a multi-tank type vacuum pressure impregnation apparatus provided with a plurality of vacuum pressure impregnation treatment tanks.

[Conventional technology]

Recently, it has been widely practiced to impregnate porous materials such as wood, cardboard, castings, and ceramics with a chemical solution to modify the porous materials. For example, cheap and soft wood or cardboard paper can be impregnated with a resin solution to increase its strength, and can be used for furniture, buildings, wall materials, etc. It is being made difficult.

For impregnating such a porous material with a chemical solution, for example, a vacuum pressure impregnation treatment apparatus shown in FIG. 9 is used. This device is a vacuum pressure impregnation treatment tank with an opening / closing lid 1 (hereinafter referred to as "impregnation tank").
A vacuum pump 6 communicated with the impregnation tank 2 by a pipe 5 with a pressure reducing valve 4, and a pressurizing means (not shown) communicated with a pipe 8 with a pressurizing valve 7. Similarly, the impregnation tank 2 is provided with a chemical liquid storage tank 10 which is communicated with the on-off valve 11 through a pipe 12. Then, the porous material 13 is accommodated in the impregnation tank 2 while being held by an appropriate frame body 3 or the like, the impregnation tank 2 is sealed, and then the vacuum pump 6 is first operated to turn the pressure reducing valve 4 on. The inside of the open impregnation tank 2 is evacuated. As a result, air, moisture, etc. contained in the porous void portions of the porous material 13 are forcibly removed. Next, the pressure reducing valve 4 is closed, the vacuum pump 6 is stopped, and the opening / closing valve 11 is opened in a vacuum state to supply the chemical solution in the chemical solution storage tank 10 into the impregnation tank 2 and store it up to a position shown by a chain line A in the figure. Porous material 13
Is immersed in a chemical solution. Then, while closing the on-off valve 11,
The pressurizing valve 7 is opened to pressurize the inside of the impregnation tank 2 so that the porous material 13
The chemical liquid is forcibly impregnated into the voids. In this way, the porous material 13 can be impregnated.

[Problems to be Solved by the Invention]

Such a vacuum pressure impregnation apparatus for a porous material has been conventionally considered to be economical as the amount of the porous material that can be treated in one impregnation is increased, and the scale-up has been promoted. However, in recent years, in order to meet diverse needs, a production system of multiple varieties and small lots is desired rather than mass production of a single product. However, the fact is that an impregnation device for such a multi-product small lot type production has not been developed.

The present invention has been made in view of the above circumstances, and it is possible to flexibly change the processing function according to the amount of the porous material to be impregnated and the processing method, and it is possible to finely respond to small lot production. The purpose is to provide a pressure impregnation device.

[Means for Solving the Problems]

In order to achieve the above object, a multi-tank type vacuum pressure impregnation apparatus of the present invention has a plurality of vacuum pressure impregnation treatment tanks for accommodating a porous material arranged in parallel, and each of the treatment tanks is connected via an on-off valve. In parallel with the common chemical solution supply / discharge means and the tank pressure adjusting means, an automatic control means for controlling the above means is provided.

[Action]

That is, in the multi-tank type vacuum pressure impregnation apparatus of the present invention, a plurality of impregnation tanks are installed side by side, and are connected in parallel to various common processing means to operate in accordance with the amount of the porous material to be processed. The number of impregnation tanks can be adjusted. Therefore, in the case of small lot production, it is sufficient to operate the minimum required number of impregnation tanks out of multiple impregnation tanks.
It can be processed without waste of water, electricity, chemicals, etc. Further, since the various treatment means and each impregnation tank are connected in parallel, the treatment in each impregnation tank is controlled by alternately controlling the opening / closing valve provided on the communication passage between each impregnation tank and the treatment means. Can also be shifted individually in time and proceed individually, with the advantage that a flexible production system can be taken as needed.

Next, the present invention will be described in detail based on examples.

〔Example〕

FIG. 1 shows an embodiment of a multi-tank type vacuum pressure impregnation apparatus of the present invention. In this device, three impregnation tanks of the same shape are arranged side by side, and a chemical solution is supplied to each of the impregnation tanks A, B and C from a single chemical solution storage tank 20 through an injection pipe 21 and branch pipes 22 to 24. It is getting injected. However, the branch pipes 22 to 24 are provided with open / close valves 25 to 27, respectively, and the drainage pipes 73 to 75 are connected via the open / close valves.

On the other hand, a single pressure adjusting pipe 32 is provided in the upper part of each of the impregnation tanks A to C, and a branch pipe 28 to a switch valve 50 to 52 is provided.
It is communicated through 30. The pressure adjusting pipe 32 includes a drain removing trap 33 provided to prevent the drain from entering, a pressure reducing valve 35 via a release valve 34, a pressure reducing pipe 36, and a pressure reducing pipe 38 provided with a vacuum pump 37. A pressurizing pipe 41 is connected to a pressurizing pipe 41 which opens and closes by a pressurizing valve 39 and communicates with a compressed air introducing means (not shown) such as a compressor. In addition, the pressure adjusting pipe 32
A pressure gauge 42, a safety valve 43, a pressure switch 44, a gauge sluice valve 45, a decompression meter 46, and a decompression switch 47 are provided in the.

Regarding the opening and closing of each on-off valve of the above device, an automatic control means (not shown) such as a computer collectively controls each on-off valve that communicates with the impregnation tank to be operated, and communicates with the impregnation tank to be operated. Two types of control can be selected, that is, individual control is performed for each on-off valve.

Therefore, by using the above apparatus, for example, the porous material 80 such as wood is stored in all the impregnation tanks A to C, and
The impregnation treatment can proceed simultaneously in the tank. That is, first, each of the impregnation tanks A to C is sealed, and then the opening / closing valves 50 to 52 are simultaneously opened, the vacuum pump 37 of the pressure adjusting pipe 32 is operated, and the pressure reducing valve 35 is opened to open the impregnation tanks A to C.
The inside is brought to a predetermined vacuum state. As a result, air and impurities are forcibly removed from the porous material 80 in each tank. Next, the on-off valves 50 to 52 are simultaneously closed, the on-off valves 22 to 24 communicating with the chemical solution storage tank 20 are simultaneously opened, and the chemical solution is simultaneously injected into each of the impregnation tanks A to C by using the differential pressure to porous material. Immerse 80 in the chemical solution. In that state, the on-off valve 50
To 52 at the same time, the pressurizing valve 39 of the pressure adjusting pipe 32 is opened, and compressed air is fed into each of the impregnation tanks A to C.
The inside of C is pressurized to a predetermined pressure. As a result, impregnation of the porous material 80 with the chemical liquid is forcibly performed. After maintaining this state for a predetermined time, the on-off valve 81 provided in the middle of the chemical liquid injection pipe 21 is opened, and the chemical liquid in each of the impregnation tanks A to C is recovered in the chemical liquid storage tank 20 by utilizing the differential pressure. Then, the impregnation tanks A to C are opened, and the porous material 80 is taken out from the inside, so that the treated products can be simultaneously obtained from the three impregnation tanks A to C.

Thus, according to the above apparatus, the same amount of the chemical liquid is injected from the common chemical liquid storage tank 20 into the three impregnation tanks A to C,
Since the pressure reduction / pressurization in the impregnation tanks A to C is performed by the common pressure adjusting pipe 32, the processing conditions in the respective impregnation tanks A to C always match, and the respective impregnation tanks A to C are From this, it is possible to obtain a processed product of exactly the same quality. On the other hand, even if three impregnation devices equipped with a chemical liquid storage tank, a chemical liquid injection pipe, and a pressure adjusting pipe are used and each device is operated under the same condition, the condition is set individually for each device. You cannot get the exact same quality. Further, in this device, it is possible to operate only one or two units at the same time by closing the opening / closing valves of unnecessary portions without operating the three units at the same time. As a result, the processing capacity of the device is reduced to 2
It can be reduced to ⅓ or ⅓, and a small amount of the porous material 80 can be treated at a treatment scale corresponding thereto. Therefore, in the past, even if a small amount of porous material was processed, it had to be processed with a large-capacity processing device, whereas there was no loss of electricity, steam, chemicals, etc.
Very economical.

In the above apparatus, the impregnation treatment of the porous material 80 is performed by using one impregnation tank (any one of A to C) instead of simultaneously operating three (or two) impregnation tanks at once. Alternatively, it is possible to start the impregnation treatment of another porous material 80 by using the other unit at a different time. An example of such parallel processing is shown in FIG. 2 as a flow chart. In this figure, the impregnation treatment is performed in a state in which the three impregnation tanks A to C are shifted by one step, but if they are shifted by one step or more, any number of steps may be shifted. The above-mentioned process is common to the chemical liquid injection pipe 2
1. It can be easily performed by controlling the on-off valve so that the pressure adjusting pipe 32 is sequentially connected to the impregnation tank according to the progress of the treatment. According to this method, when the treatment amount increases after the treatment is started in one of the impregnation tanks, the treatment for the increased amount can be started without waiting for the end of the previous treatment. For example, there is an advantage that the processing amount can be made flexible.

FIG. 3 shows another embodiment. That is, this device is similar to the device shown in FIG. 1 above. Three chemical impregnation tanks A to C communicating with a common chemical liquid storage tank 20 and a common pressure adjusting pipe 32 are further provided with a chemical liquid circulation pipe 55 equipped with a circulation pump 53. The three chemical liquid circulation paths Q to S are formed in parallel. Then, the on-off valve 5 is provided on the chemical liquid circulation paths Q to S.
6 to 61 are provided. Therefore, according to this device, by operating the circulation pump 53, the chemical liquid injected into the impregnation tanks A to C can be forcedly circulated, and the chemical liquid impregnation can be performed more effectively.

When the common chemical liquid circulation pipe 55 is provided as described above, as shown in FIG.
A heat exchanger 54 may be provided. In this way, when the chemical solution needs to be heated, the heat exchanger 54 heats the chemical solution to a uniform temperature in each impregnation tank A to
Since it can be circulated and supplied to C, there is no temperature unevenness in the chemical liquid contacting the porous material 80, and accordingly, no unevenness occurs in the impregnation process.

FIG. 5 shows still another embodiment. This device
Similar to the device shown in FIG. 2, three impregnation tanks A to
C, the common chemical liquid storage tank 20, the common chemical liquid circulation pipe 55, and the pressure adjustment pipe 32 are provided, and further, the common drying pipe 65 is provided. That is, each impregnation tank A
The inside of ~ C is connected to the dry piping 65 which equipped the cooler 62, the blower 63, and the heater 64, respectively at the one end side and the other end side, and the hot-air circulation paths L-N which share the said dry piping 65 are formed. Has been formed. Therefore, according to this apparatus, as in the case of using the apparatus shown in FIG. 3, the porous material 80 is circulated and impregnated with the chemical liquid in each of the impregnation tanks A to C, and the chemical liquid storage tank 20 is utilized by utilizing the differential pressure. After recovering the chemical liquid in the impregnation tank A, the on-off valves 66 to 71 on the hot air circulation paths L to N are opened, and the cooler 62, the blower 63, and the heater 64 are operated.
It is possible to simultaneously circulate hot air into C to dehumidify. Thereby, the porous material 80 in the impregnation tanks A to C can be dried.

It should be noted that, as shown in FIG. 6, the drying pipe 65 is connected to the circulation passages Q to R by switching the chemical liquid circulation pipe 55 and the open / close valve.
May be connected to. In this case, since the chemical liquid circulation and the hot air circulation are shared by the circulation paths Q to R, it is not possible to perform the chemical liquid circulation in the impregnation tank A and the hot air drying in the impregnation tank B, for example. Although it must be continuously performed as one continuous process, it has an advantage that the piping configuration is simpler than that of FIG.

Further, in place of the drying pipe 65, as shown in FIG. 7, a hot air blowing pipe 65 ′ provided with a blower 63 and a heater 64 and not provided with a cooler is connected to each of the impregnation tanks A to C. Good. In this case, by circulatingly feeding hot air into each of the impregnation tanks A to C, it is possible to perform heat treatment such as thermosetting the chemical liquid impregnated in the porous material 80.

FIG. 8 shows a circulation pump 53 for each of the impregnation tanks A to C.
An example is shown in which a chemical liquid circulation pipe 55 including a heat exchanger 54 is communicated with each other. According to this device, each impregnation tank A
It is possible to individually set the chemical liquid circulation speed, the chemical liquid temperature, and the tank pressure condition within C. Therefore, different impregnation treatments depending on the type and purpose of the porous material can be performed at the same time, and multi-product small lot production can be realized.

In each of the above-mentioned examples, the impregnation tanks arranged in parallel are 3 of A to C.
Although it is a table, the number of impregnation tanks is not particularly limited, and if there are a plurality of impregnation tanks, the same operation and effect as those of the above-described embodiment can be obtained.

Further, in each of the above-described embodiments, the chemical liquid after the impregnation tank is collected in the chemical liquid storage tank 20 by utilizing the differential pressure, but the chemical liquid may be collected depending on the characteristics of the chemical liquid and the porous material 80. May not be reused. In such a case, the chemical liquid may be removed from the drainage pipes 73 to 75 connected to the respective impregnation tanks A to C.

By the way, as the porous material targeted by the present invention,
Examples include wood, cardboard paper, castings, roof tiles, bricks, and bamboo materials. Then, these may be directly loaded in the impregnation tank, or a plurality of them may be bound in a wire or loaded in a frame body made of wire mesh or the like.

Further, the chemical liquid for impregnation may be any one that has been conventionally used for impregnation treatment, and is not particularly limited. For example, for the purpose of strengthening wood or cardboard, a prepolymer of acrylic resin or unsaturated polyester resin is used.

Further, the size of the impregnation tank in the present invention is not particularly limited, but if a small-scale one having an inner diameter of about 200 to 400 mm is used, it is possible to finely cope with small lot production, which is preferable.

〔The invention's effect〕

As described above, the multi-tank type vacuum pressure impregnation apparatus of the present invention,
A number of impregnation tanks to be operated can be adjusted according to the amount of porous material to be processed by arranging a plurality of impregnation tanks in parallel and connecting each impregnation tank to various common processing means in parallel. Is. Therefore, in the case of small lot production, it is sufficient to operate the minimum necessary number of impregnation tanks out of a plurality of impregnation tanks, and water, electricity, chemical liquid, etc. can be treated without waste. . Further, since the various treatment means and each impregnation tank are connected in parallel, the treatment in each impregnation tank is controlled by alternately controlling the opening / closing valve provided on the communication passage between each impregnation tank and the treatment means. Can also be separately advanced in parallel in a time-shifted state, and there is an advantage that a flexible production system can be taken as needed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing an example of an embodiment of the above embodiment, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. FIG. 8 and FIG. 8 are configuration diagrams showing another embodiment, respectively, and FIG. 9 is a conventional impregnation treatment apparatus. 20 ... Chemical liquid storage tank, 21 ... Chemical liquid injection pipe, 32 ... Pressure adjusting pipe, 55 ... Circulation pipe, 65 ... Drying pipe, 6
5 '... hot air blowing pipe, 80 ... porous material, A, B,
C ... Impregnation tank, Q, R, S ... Chemical circulation circuit

Claims (6)

[Claims] 1. A plurality of vacuum pressure impregnation treatment tanks for accommodating a porous material are arranged in parallel, and the respective treatment tanks are arranged in parallel with a common chemical liquid supply / discharge means and a common tank pressure adjustment means via an on-off valve. A multi-tank type vacuum pressure impregnation apparatus characterized in that it is provided with automatic control means for controlling each of the above-mentioned means. 2. The multi-tank type vacuum pressure impregnation apparatus according to claim 1, wherein each of the processing tanks is connected in parallel to a common chemical liquid circulating means via an opening / closing valve. 3. The multi-tank type vacuum pressure impregnation apparatus according to claim 2, wherein a chemical solution heating means is provided in the middle of a pipe connecting the processing baths to the chemical solution circulation means. 4. The multi-tank type vacuum pressure impregnation apparatus according to claim 1, wherein the respective processing tanks are connected in parallel to a common drying means via an opening / closing valve. 5. The multi-tank type vacuum pressure impregnation apparatus according to claim 1, wherein the respective processing tanks are connected in parallel to a common hot air blowing means via an opening / closing valve. 6. The multi-tank type vacuum pressure impregnation apparatus according to claim 1, wherein a chemical liquid circulating means is connected to each of the processing tanks.