JP2012127372A - Method of sending liquid and method of manufacturing liquid impregnated sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of sending a liquid by which a liquid sending amount can be controlled with high accuracy by a comparatively simple facility against pressure pulsation that occurs in a liquid sending process, and to provide a method of manufacturing a liquid-impregnated sheet.SOLUTION: A reservoir 2 of a liquid is connected to a liquid giving means 5 with a piping 3. A plunger type pump 4 arranged in a part of the piping 3 intermittently sends the liquid reserved in the reservoir 2 by a predetermined amount to the liquid giving means 5. A piping 31 between the reservoir 2 and the pump 4 is not fixed to immovable parts 7, 20 and arranged to have a part 31C extended downward roughly vertically from the pump 4 or disposed to meet all of the following requirements (1) to (3). (1) The piping is fixed to the immovable part 7 at one part near the reservoir 2 and a part of the piping exist between the fixed part and the reservoir without being fixed to the immovable part. (2) The part between the fixed part in (1) and the pump 4 is not fixed to the immovable part. (3) The piping has the part 31C extended downward roughly vertically from the pump 4.

Description

  The present invention relates to a liquid feeding method and a method for producing a liquid-impregnated sheet using the liquid feeding method.

  Pressure pulsation caused by the pump when the liquid storage tank and the liquid usage destination are connected by piping, and the liquid stored in the storage tank is sent to the usage destination by a pump arranged in the middle of the piping It is known that pipe vibration occurs due to the above. Piping vibration causes noise and pipe damage.

  As a technique related to the prevention of pipe vibration, for example, Patent Document 1 describes a pipe vibration prevention device for preventing vibration generated in an insertion pipe or a pull-out pipe of a control rod drive system in a nuclear reactor. Further, Patent Document 2 pays attention to the fact that the main cause of the pipe vibration is a standing wave generated in the water pipe due to the pressure pulsation wave of the discharge water of the pump. It is described that fixation is performed at the abdominal part of the standing wave. In Patent Document 3, the vibration of the pipe is detected by a vibration detector, and using the detection signal, an excitation signal that cancels the vibration of the pipe is obtained by an arithmetic controller, and vibration is generated in response to the excitation signal. A pipe vibration preventing device configured to vibrate a pipe with a generator is described.

  Further, in Patent Document 4, in a liquid refrigerant pump, at least one of a suction pipe and a discharge pipe connected to a positive displacement pump mechanism and a pulsation reducing container are connected by a plurality of communication pipes, whereby a suction pipe and a discharge pipe are connected. It is described that the pipe vibration of the pipe is reduced. Patent Document 5 describes a device that uses a special actuator as a vibration suppression device for piping for air conditioning and sanitation for high-rise buildings and the like.

JP-A 61-145485 JP-A-62-270881 JP-A-5-141585 JP 7-27083 A JP-A-8-291890

  The techniques described in Patent Literatures 1 to 5 are mainly intended to prevent pressure pulsation caused by the pump and piping vibration caused by the pulsation, and require dedicated means for achieving the purpose. There is a possibility that the entire apparatus becomes complicated and large, and it is difficult to apply to a small liquid feeding system in which a single liquid feeding amount is relatively small.

  By the way, the pressure pulsation described above may cause not only the vibration of the pipe as described in Patent Documents 1 to 5, but also the inconvenience that the amount of the liquid flowing through the pipe is not constant. In particular, when a constant small amount of liquid is intermittently fed to the user at a high speed using a metering pump such as a plunger-type pump, the amount of liquid fed is controlled in the intermittent and repeated liquid feeding. Where high accuracy is required, pressure pulsation reduces the accuracy of the amount of liquid delivered, which may cause variations in the quality of the final product (for example, a liquid-impregnated sheet obtained by applying liquid to a sheet-like material). There is. Such inconveniences related to the accuracy of the liquid feeding amount are not described in Patent Documents 1 to 5, and a technique for this problem has not yet been proposed.

  Accordingly, an object of the present invention is to provide a liquid feeding method and a liquid impregnated sheet manufacturing method capable of controlling the liquid feeding amount with a relatively simple equipment with high accuracy against pressure pulsation generated in the liquid feeding process. There is to do.

The present invention connects a liquid storage tank and a use destination of the liquid with a pipe, and intermittently uses the liquid stored in the storage tank by a plunger-type pump arranged in the middle of the pipe. A liquid feeding method for feeding liquid first, wherein a pipe between the storage tank and the plunger pump is not fixed to a stationary part and has a portion extending substantially vertically downward from the plunger pump. The above-mentioned problem is solved by providing a liquid feeding method that is arranged in such a manner that it is arranged so as to satisfy all of the following 1) to 3).
1) It fixes to a stationary part at one place in the vicinity of the storage tank, and a part of the piping remains between the fixed part and the storage tank without being fixed to the stationary part.
2) Between the fixed part of said 1) and the said plunger type pump, it does not fix to a fixed part.
3) It has a portion extending substantially vertically downward from the plunger type pump.

Further, the present invention is a method for producing a liquid-impregnated sheet obtained by applying a liquid to a sheet-like material, wherein a plunger is provided by connecting a liquid storage tank and a liquid applying means with a pipe and arranged in the middle of the pipe. The pump stores the liquid stored in the storage tank intermittently to the liquid application means by a predetermined amount, and the pipe between the storage tank and the plunger pump is not fixed to the stationary part and By providing a method for producing a liquid-impregnated sheet, which is disposed so as to have a portion extending substantially vertically downward from the plunger-type pump, or is disposed so as to satisfy all of the following 1) to 3): Is a solution.
1) It fixes to a stationary part at one place in the vicinity of the storage tank, and a part of the piping remains between the fixed part and the storage tank without being fixed to the stationary part.
2) Between the fixed part of said 1) and the said plunger type pump, it does not fix to a fixed part.
3) It has a portion extending substantially vertically downward from the plunger type pump.

  ADVANTAGE OF THE INVENTION According to this invention, control of the amount of liquid feeding can be performed with high precision with a comparatively simple installation with respect to the pressure pulsation which generate | occur | produces in the liquid feeding process. In addition, according to the present invention, a liquid-impregnated sheet obtained by applying a liquid to a sheet-like material can be efficiently manufactured while suppressing variation in quality.

FIG. 1 is a diagram showing a schematic configuration of an example of an apparatus that can be used for carrying out the liquid feeding method or the liquid-impregnated sheet manufacturing method of the present invention. FIG. 2 is a diagram showing a step of applying a liquid to a sheet-like material in the method for producing a liquid-impregnated sheet using the apparatus shown in FIG. FIG. 3 is a view corresponding to FIG. 1 of another example of an apparatus that can be used for carrying out the liquid feeding method or the liquid-impregnated sheet manufacturing method of the present invention. FIG. 4 is a view corresponding to FIG. 1 for a liquid feeding method or a liquid impregnated sheet manufacturing method outside the scope of the present invention.

  Hereinafter, the liquid feeding method of the present invention will be described together with the method for producing a liquid-impregnated sheet of the present invention using the liquid feeding method based on a preferred embodiment thereof with reference to the drawings. FIG. 1 shows a schematic configuration of an apparatus that can be used for carrying out the method for producing a liquid-impregnated sheet of this embodiment. As shown in FIG. 2, the method for producing a liquid-impregnated sheet according to this embodiment includes a step of applying a liquid to the sheet-like material 10 by the liquid applying means 5 to obtain a liquid-impregnated sheet 11, and applying the liquid Liquid feeding to the means 5 is performed using the liquid feeding apparatus 1 shown in FIG.

  A liquid feeding device 1 shown in FIG. 1 includes a storage tank 2 that stores liquid, a pipe 3 that connects the storage tank 2 and a liquid application means 5 that is a usage destination of the liquid, and a pump that is disposed in the middle of the pipe 3. 4, and the liquid stored in the storage tank 2 is intermittently sent to the liquid applying means 5 by a predetermined amount by the pump 4. The pipe 3 is divided into a pump primary pipe 31 that connects the storage tank 2 and the pump 4, and a pump secondary pipe 32 that connects the pump 4 and the liquid application means 5.

  As shown in FIG. 1, the storage tank 2 and the pump 4 are arranged such that the liquid level of the liquid stored in the storage tank 2 is always above the pump 4. The storage tank 2 in this embodiment is always positioned above the pump 4 by a support base 7 that supports the storage tank 2 from below. The support base 7 is fixed to the apparatus installation surface 20 such as the ground surface or the floor surface, and itself is a stationary part that does not move. In addition, for example, when the storage tank 2 is fixed and installed so as not to move during liquid feeding, as in the case where the storage tank 2 is fixed to the support body 7, the storage tank fixed and installed is an immobile part. is there. In addition, various parts attached to the storage tank which is the stationary part and which does not move during liquid feeding, for example, a liquid discharge nozzle that protrudes from the outer surface of the storage tank and can be connected to the pipe is the stationary part. It is a part of the storage tank and is usually a stationary part. The pump 4 also vibrates during liquid feeding but does not move and is therefore a stationary part.

  The pump 4 is a plunger type pump. A plunger type pump is a pump that operates by reciprocating a piston or plunger with a cam or crank, etc. Usually, a fixed quantity cylinder (not shown) or an extrusion that supplies a fixed amount of liquid that has entered the fixed quantity cylinder It has a stick. By using the plunger type pump 4, the liquid stored in the storage tank 2 can be intermittently sent to the use destination (liquid applying means 5) by a certain amount. As the pump 4, a known plunger type metering pump can be used. Specifically, for example, a trade name “Hicera Pump” manufactured by Iwaki Co., Ltd. can be used.

  As shown in FIGS. 1 and 2, the liquid applying means 5 in this embodiment includes a cylindrical nozzle. One end side of the nozzle constituting the liquid application means 5 is connected to a pipe 32 extending from the pump 4, and the other end side is arranged at a position spaced apart from the sheet-like object 10 that is a liquid application object by a predetermined distance. . The liquid application unit 5 is a non-contact type liquid application unit that applies liquid to the liquid application object without contacting the liquid application object. A liquid is dropped from the provided dripping port (not shown) onto the sheet-like material 10 flowing below. In this embodiment, as shown in FIG. 2, a plurality of single-sheet sheets 10 that are liquid application objects are arranged on the conveyor belt 6 at predetermined intervals in the conveyance direction MD. The liquid applying means 5 sequentially applies (drops) a predetermined amount of liquid to each sheet-like material 10 being transferred.

  The method for producing a liquid-impregnated sheet according to this embodiment uses a small liquid feeding system (liquid feeding device 1) in which the amount of liquid fed at one time is relatively small, and the liquid feeding system is a plunger type. The pump 4 intermittently feeds a constant small amount of liquid at a high speed to the user (liquid application means 5). From the viewpoint of carrying out such liquid feeding, the one-stroke discharge capacity of the plunger type pump 4 in the present embodiment is set to a relatively small amount of 3 ml or less, particularly 0.3 to 2 ml. Therefore, the amount of liquid that is intermittently and repeatedly dropped from the liquid applying means 5 (the amount of liquid applied to one sheet-like material 10) is constant within the same range as the one-stroke discharge capacity of the pump 4. Ideally.

  As the pipes 3 (31, 32) for connecting the respective parts of the liquid feeding device 1, pipes made of metal such as stainless steel and copper can be used in addition to resin pipes such as nylon and polyolefin. The pipe 3 (31, 32) in this embodiment is a hollow flexible tube made of polyolefin resin and has flexibility. The inner diameter of the pipe 3 (31, 32) is not particularly limited, but is preferably 2.5 to 10 mm.

  One of the main features of the method for producing a liquid-impregnated sheet according to this embodiment is a disadvantage caused by pressure pulsation caused by the plunger-type pump 4, in particular, “a small amount of liquid given to the liquid application means 5 by the plunger-type pump 4. In order to prevent the inconvenience that the accuracy of the liquid delivery amount per time when the liquid is intermittently delivered at a high speed is reduced by the pressure pulsation caused by the plunger type pump 4, the storage tank 2 and the plunger The point which devised the arrangement | positioning form of the piping 31 which connects the type | mold pump 4 is mentioned. Specifically, the piping 31 between the storage tank 2 and the plunger pump 4 is arranged according to the following arrangement form A or B.

Arrangement form A: The piping 31 is arranged so as not to be fixed to the stationary part and to have a portion extending substantially vertically downward from the plunger pump 4 (see FIG. 1).
Arrangement form B: Arranged so as to satisfy all of the following 1) to 3). 1) It fixes to a stationary part at one place near the storage tank 2, and a part 31Aa of the pipe 31 is not fixed to the stationary part between the fixed part and the storage tank 2. 2) Between the fixed part of said 1) and the plunger type pump 4, it is not fixed to a stationary part. 3) It has a portion extending substantially vertically downward from the plunger type pump 4 (see FIG. 3).

  FIG. 1 shows a specific example of the arrangement form A. In the arrangement form A, the piping 31 includes a first portion 31A extending substantially vertically downward from the bottom of the storage tank 2 toward the device installation surface 20, and from the bottom of the plunger pump 4 toward the device installation surface 20. A third portion 31C extending substantially vertically downward and a second portion 31B located between both the portions 31A and 31C are configured such that these three portions 31A, 31B and 31C are connected to each other. As shown in FIG. 1, a substantially J-shaped pipe 31 is formed in a side view. In the arrangement form A, as shown in FIG. 1, the entire pipe 31 on the pump primary side connecting the storage tank 2 (non-moving part) and the pump 4 (non-moving part) is fixed to the non-moving part (storage tank 2, support base). 7, device installation surface 20, free part not fixed to pump 4). Arrangement form A differs from arrangement form B only in this respect. As for the details of the arrangement form A, details of the arrangement form B described later are applied as appropriate.

  FIG. 3 shows a specific example of the arrangement form B. In the arrangement form B, the first portion 31A of the pipe 31 is fixed to the support base 7 which is an immobile part by a fixing tool 8 at one place in the vicinity of the storage tank 2 as in 1). Here, “the vicinity of the storage tank” means an area within 0.5 m, preferably within 0.3 m from the storage tank 2. A portion 31Aa of the pipe 31 is fixed between the fixed portion of the pipe 31 (first portion 31A) by the fixture 8 and the storage tank 2, and the stationary part (the storage tank 2, the support base 7, the device installation surface 20, the pump 4) is not fixed, and a portion 31Ab of the pipe 31 is not fixed between the fixing portion (fixing tool 8) and the apparatus installation surface 20 (the storage tank 2, the support base 7). The device installation surface 20 is not fixed to the pump 4). That is, the first portion 31A of the pipe 31 in the arrangement form B has two free portions 31Aa and 31Ab that are not fixed to the immovable portion, and the two free portions 31Aa and 31Ab are located in the vicinity of the storage tank 2. It exists up and down across 1 fixed part (non-free part) to the fixed part which is located. Note that a part 31a of the pipe 31 (first portion 31A) passes through a through hole (not shown) penetrating in a thickness direction through a pedestal portion 71 on which the storage tank 2 is placed in the support base 7, and the pedestal It extends to the fixture 8 without contacting the portion 71. The fixture 8 is a substantially U-shaped pipe stopper that can be screwed to a support column (a portion extending vertically in FIG. 3) of the support base 7.

  The portion 31Ab located below the fixture 8 in the first portion 31A of the pipe 31 and the second portion 31B and the third portion 31C of the pipe 31 are both stationary portions (reservoir) as in 2) above. It is a free part that is not fixed to the tank 2, the support 7, the device installation surface 20, and the pump 4), and the space between the fixture 8 and the plunger type pump 4 in the pipe 31 hangs down due to its own weight. Yes. The third portion 31C is the portion itself defined in 3). The second portion 31 </ b> B is the lowermost portion of the pipe 31 and includes a portion that is closest to the device installation surface 20. As shown in FIG. 3, the second portion 31 </ b> B in this embodiment is not in contact with the device installation surface 20, and therefore the entire pipe 31 is disposed above the device installation surface 20. In the example shown in the figure, the second portion 31B has its longitudinal ends slightly raised upward, and the portion sandwiched between the both ends is substantially parallel to the device installation surface 20. The shape is not limited, and a convex arc shape (U-shape) toward the device installation surface 20 may be used.

  By arranging the piping 31 between the storage tank 2 and the plunger type pump 4 according to the arrangement form A as shown in FIG. 1 or the arrangement form B as shown in FIG. 4 is suppressed from being reduced in accuracy of the amount of liquid delivered to the secondary side, and a certain small amount of liquid can be repeatedly delivered to the liquid application means 5 with high accuracy, thereby varying the quality of the liquid-impregnated sheet 11. Is reduced. The adoption of the arrangement form A or B does not reduce the pressure pulsation of the pump 4 or the piping vibration caused by the pump 4, and these phenomena can still be seen even if the arrangement form A or B is adopted. In other words, the present invention does not actively prevent pressure pulsation or pipe vibration as in the techniques described in Patent Documents 1 to 5, but “feeds liquid by not actively preventing pressure pulsation and pipe vibration. It is made based on the knowledge that is not described in Patent Documents 1 to 5 "Accuracy is high". And according to this invention, only the piping 31 is arrange | positioned like arrangement | positioning form A or B, Such a subject can be solved with a comparatively simple installation, without causing complication and enlargement of the whole apparatus.

It is preferable that the dimensions of each part in the arrangement form A or B are set as follows from the viewpoint of ensuring the above-described effects.
The total length of the pipe 31, that is, the length of the pipe between the storage tank 2 and the plunger type pump 4 is preferably 1 to 10 m, more preferably 1 to 5 m.
The height L1 (see FIG. 1) of the liquid level of the liquid stored in the storage tank 2 from the device installation surface 20 is preferably 0.3 to 2 m.
The height L2 from the device installation surface 20 of the plunger type pump 4 (see FIG. 1, the height from the device installation surface 20 to half of the height direction of the pump 4) is preferably 0.5 to 1 m.
The distance L3 (see FIG. 1) between the first portion 31A and the third portion 31C of the pipe 31 is preferably 0.3 to 10 m, and more preferably 1 to 5 m.
The height L4 (see FIG. 1) of the liquid application means 5 from the device installation surface 20 is preferably 1 to 1.5 m.

  Although the reason why high-precision liquid feeding is possible by adopting the arrangement form A or B is not certain, as shown in FIG. 4, the immovable part of the pipe 31 between the storage tank 2 and the plunger pump 4. When the number of fixing points (fixing tool 8) is increased and the degree of freedom of movement of the pipe 31 is reduced, as will be described later, variation in the amount of liquid delivered becomes conspicuous in intermittent repeated liquid feeding. Therefore, the piping 31 is not fixed to the fixed part at all as in the arrangement form A shown in FIG. 1, or the fixed part (support) is arranged at only one specific place as in the arrangement form B shown in FIG. By fixing to the base 7), that is, by reducing the degree of freedom of movement of the pipe 31 as much as possible, the vibration energy of the pump 4 is reduced by the movement of the pipe 31 (pipe vibration). As a result, to the liquid application means 5 It is presumed that high precision liquid feed is enabled.

  The sheet-like material 10 to which a liquid is applied in the method for producing a liquid-impregnated sheet of this embodiment will be described. The sheet-like material 10 is an intermediate body of the liquid-impregnated sheet 11 that is a heating element capable of generating heat by contact with air. And the liquid is an aqueous electrolyte solution. More specifically, the sheet-like material 10 is a sheet-like material containing an oxidizable metal and fibers, and the liquid-impregnated sheet 11 generates heat due to an oxidation reaction between oxygen in the air and the oxidizable metal. It is a heating element using. As shown in FIG. 2, a liquid impregnated sheet 11 that is a heating element is obtained by applying an electrolyte aqueous solution to the sheet-like material 10 using the liquid applying means 5.

  Examples of the oxidizable metal constituting the sheet-like material 10 include iron, aluminum, zinc, and copper. Examples of the fiber include wood pulp and various synthetic fibers. If necessary, the sheet-like material 10 may further include a water retention agent (for example, vermiculite, calcium silicate, silica gel, silica-based porous material, alumina, pulp, wood powder, water-absorbing polymer, etc.), a reaction accelerator (for example, Activated carbon, carbon black, graphite and the like). In the sheet-like material 10, the content of the oxidizable metal is preferably 10 to 90% by mass, more preferably 30 to 80% by mass, and the content of the fiber is preferably 2 to 80% by mass, More preferably, it is 5-50 mass%.

  Examples of the form of the sheet-like material 10 include a sheet-like material obtained by wet papermaking, and a laminate formed by sandwiching exothermic powder with paper or the like. Such a sheet-like article 10 can be manufactured using, for example, a wet papermaking method described in Japanese Patent Application Laid-Open No. 2003-102761 or an extrusion method using a die coater according to the earlier application of the present applicant. .

  Examples of the electrolyte of the electrolyte aqueous solution include alkali metal chlorides such as sodium chloride and potassium chloride, and alkaline earth metal chlorides such as calcium chloride and magnesium chloride. The electrolyte content in the electrolyte aqueous solution is preferably 3 to 10% by mass.

  The viscosity of the electrolyte aqueous solution (liquid handled in the present invention) is preferably 1 to 10 cP. The viscosity of the liquid is measured by a rotational viscometer described in JIS K7117-1 or JIS K7117-2, various measuring methods described in JIS Z8803, and the like.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, as shown in FIG. 1 and FIG. 3 in the above embodiment, the second portion 31B is not in contact with the apparatus installation surface 20, but the second portion 31B is not in any of the arrangement forms A and B. Further, it may be in contact with the device installation surface 20 or may be arranged so as to crawl the device installation surface 20.

  Moreover, in the said embodiment, although the liquid was provided to the sheet-like material 10 of the sheet, you may provide a liquid to a strip | belt-shaped sheet material. In addition, the application target of the present invention is not limited to the above-described production of a heating element that can generate heat by contact with air, and the present invention can be applied to a sheet-like material including pulp, nonwoven fabric, etc. The present invention can also be applied to the manufacture of cleaning sheets, decorative sheets, and the like that are provided with a liquid such as water.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such embodiments.

[Example 1]
A device having the same basic configuration as the liquid feeding device 1 described above is used, pipes are arranged according to the arrangement form A (see FIG. 1), and a certain amount of electrolyte aqueous solution (5 mass of sodium chloride is added to a plurality of sheet-like materials being conveyed. % Aqueous solution, viscosity 1 cP) was successively dropped to produce a plurality of liquid-impregnated sheets (heating elements). The conveyance speed of the sheet-like material was 300 / min, and the dropping amount of the aqueous electrolyte solution per sheet-like material (1 stroke discharge capacity of the plunger type pump) was set to 1.454 ml. The product name “Hicera Pump” model V-15 manufactured by Iwaki Co., Ltd. was used as the plunger type pump, and a polyolefin tube (outer diameter 10 mm, inner diameter 6.5 mm) was used as the piping. The sheet-like material of Example 1 is an intermediate of a heating element capable of generating heat by contact with air, contains 83% by mass of iron powder, 8% by mass of pulp, and 9% by mass of carbon, and has a basis weight of 450 g / m ^2. A rectangular shape with dimensions of 49 mm × 49 mm.

  The dimensions (see FIG. 1) of each part of the apparatus in Example 1 are as follows. Total length of the piping 31: 4 m, liquid level height L1: 1.7 m, pump installation height L2: 0.6 m, separation distance L3 between the first portion 31A and the third portion 31C of the piping 31: 2.2 m The installation height L4 of the liquid application means 5: 1.1 m.

[Example 2]
In the first embodiment, the distance L3 between the first portion 31A and the third portion 31C of the pipe 31 is set to 2.1 m, and the second portion 31B is brought into contact with the apparatus installation surface 20 to crawl the surface 20. Except for the arrangement, the same procedure as in Example 1 was performed.

Example 3
Example 1 was the same as Example 1 except that the liquid level height L1 was 0.6 m, and the separation distance L3 between the first portion 31A and the third portion 31C of the pipe 31 was 3.3 m.

Example 4
In the third embodiment, the distance L3 between the first portion 31A and the third portion 31C of the pipe 31 is set to 3.2 m, and the second portion 31B is brought into contact with the device installation surface 20 to crawl the surface 20. The same procedure as in Example 3 was performed except that the above arrangement was made.

[Comparative Example 1]
In Example 2, a fixed amount of electrolyte aqueous solution was sequentially dropped onto a plurality of sheet-like materials in the same manner as in Example 2 except that the number of fixing points to the immovable part of the piping 31 was increased, and a plurality of liquid-impregnated sheets A (heating element) was produced. Specifically, in the embodiment shown in FIG. 4, the fixing of the pipe 31 to the support base 7 by all of the three places by the fixing tool 8 is removed, and the fixing of the piping 31 to the immovable part is fixed to the apparatus installation surface 20. Only three places were fixed according to 8.

[Comparative Example 2]
Comparative Example 1 was the same as Comparative Example 1 except that the liquid level height L1 was 0.6 m, and the separation distance L3 between the first portion 31A and the third portion 31C of the pipe 31 was 3.2 m.

[Evaluation]
About each Example and each comparative example, the quantity (liquid application amount) of the electrolyte aqueous solution actually provided to each sheet-like material was measured (estimated) by the following method. The results are shown in Table 1 below.

<Measurement method of liquid application amount>
An electronic balance (manufactured by Shinko Denshi Co., Ltd., electromagnetic force balance type electromagnetic balance, trade name “PF-R600C”) having a tray is disposed below the liquid application means in the liquid feeding device, and the liquid application means passes through the tray. A liquid (aqueous electrolyte solution) is directly dropped toward In a test room at a temperature of 22 ° C., the liquid is continuously dropped 10 times from the liquid application means toward the receiving tray, the total weight of the liquid for 10 drops is measured with the electronic balance, and the measured value is divided by 10 The calculated value is defined as a liquid application amount per one dropping operation. Such a liquid application amount calculation operation was carried out 10 times, and the liquid application amount at each time is shown as No. 1 in Table 1 below. Shown as 1-10. The item “Average” in Table 1 below is No. The average value of the liquid application amounts of 1 to 10, and the item “maximum value” in Table 1 below is No. 1 to 10 is the maximum liquid application amount. It is the minimum liquid application amount among 1-10. It can be determined that the smaller the item “standard deviation σ” in Table 1 is, the smaller the variation in the amount of applied liquid is, and the more precisely the liquid supply amount is controlled.

  As is apparent from the results shown in Table 1, Examples 1 to 4 in which the piping (pump on the primary side of the pump) between the storage tank and the plunger-type pump is arranged according to the arrangement form A are arranged in the arrangement form. It can be seen that the standard deviation σ is small as compared with Comparative Examples 1 and 2 arranged in a form different from A and B, and therefore the liquid feeding amount is controlled with high accuracy.

DESCRIPTION OF SYMBOLS 1 Liquid feeder 2 Storage tank 3 Piping 31, 31A, 31Aa, 31Ab, 31B, 31C Pump primary side piping 32 Pump secondary side piping 4 Plunger type pump 4
5 Liquid applying means 6 Conveying belt 7 Support base 8 Fixing tool 10 Sheet-like material 11 Liquid impregnated sheet 20 Device installation surface

Claims (5)

A liquid storage tank is connected to the use destination of the liquid with a pipe, and a plunger-type pump arranged in the middle of the pipe is used to intermittently feed the liquid stored in the storage tank to the use destination by a certain amount. A liquid feeding method,
The piping between the storage tank and the plunger type pump is not fixed to the stationary part and is arranged so as to have a portion extending substantially vertically downward from the plunger type pump, or the following 1) to 3) ) Liquid feeding method to be arranged so as to satisfy all.
1) It fixes to a stationary part at one place in the vicinity of the storage tank, and a part of the piping remains between the fixed part and the storage tank without being fixed to the stationary part.
2) Between the fixed part of said 1) and the said plunger type pump, it does not fix to a fixed part.
3) It has a portion extending substantially vertically downward from the plunger type pump.   The liquid feeding method according to claim 1, wherein the plunger type pump has a one-stroke discharge capacity of 3 ml or less.   The liquid feeding method according to claim 1, wherein the pipe is made of resin. A method for producing a liquid-impregnated sheet obtained by applying a liquid to a sheet-like material,
A liquid storage tank and a liquid application means are connected by a pipe, and a liquid stored in the storage tank is intermittently supplied to the liquid application means by a plunger-type pump arranged in the middle of the pipe. And
The piping between the storage tank and the plunger type pump is not fixed to the stationary part and is arranged so as to have a portion extending substantially vertically downward from the plunger type pump, or the following 1) to 3) ) Is disposed so as to satisfy all of the above.
1) It fixes to a stationary part at one place in the vicinity of the storage tank, and a part of the piping remains between the fixed part and the storage tank without being fixed to the stationary part.
2) Between the fixed part of said 1) and the said plunger type pump, it does not fix to a fixed part.
3) It has a portion extending substantially vertically downward from the plunger type pump.   The method for producing a liquid-impregnated sheet according to claim 4, wherein the sheet-like material is an intermediate of a heating element capable of generating heat by contact with air, and the liquid is an aqueous electrolyte solution.

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