JP2014217795A - Liquid discharge method and liquid discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid discharge method capable of stably discharging a liquid without solidifying a moisture curable adhesive in a cylinder in a liquid discharge device having a rotor with a screw part and to provide the liquid discharge device.SOLUTION: A liquid discharge method comprises at least: a liquid filling step to fill a moisture curable adhesive filled in a liquid tank into a cylinder with pressure; an air discharge step to discharge air in the cylinder from an exhaust port located at the upper part of the cylinder; an exhaust port closing step to close the exhaust port; a rotation step to rotate a rotor and a screw part located at the rotor; and a liquid discharge step to quantitatively discharge the moisture curable adhesive in the cylinder from a nozzle part.

Description

  The present invention includes at least a cylinder capable of introducing a liquid therein, and a rotor inserted into the cylinder and rotatable around a central axis of the cylinder, the rotor being introduced into the cylinder. The present invention relates to a liquid ejecting apparatus in which a screw part capable of mixing and stirring the liquid is provided spirally along the outer peripheral surface of the rotor, and the liquid can be ejected from a nozzle part formed or attached to the cylinder.

  Conventionally, for example, liquid ejecting apparatuses that automatically eject liquid, such as Japanese Patent Publication No. 5-11513 “viscous liquid extrusion apparatus”, are well known. Although such a device body is not specifically shown, high pressure is applied to the cylinder, nozzle, etc., so that it can withstand it, and further, it is made of metal so as not to cause liquid leakage or liquid scattering due to breakage of components. It was general.

  Japanese Patent Application Laid-Open No. 7-178728, “Moisture-curing prepreg, its use and its enforcement method” discloses that a rope prepreg impregnated with a moisture-curing resin is stored in a sealed space without air.

"Japanese Patent Publication No. 5-11513" "Japanese Patent Laid-Open No. 7-178728"

  When using a moisture-curing adhesive as in the liquid discharge device of Patent Document 2 described above, the screw-type discharge device disclosed in Patent Document 1 discharges liquid while discharging air in the cylinder. Therefore, there has been a problem that the moisture curable adhesive is solidified by moisture such as in the air.

  An object of the present invention is to provide a liquid ejecting apparatus including a rotor provided with a screw portion in view of the above-described conventional problems, and the moisture curable adhesive can be stably stabilized without solidifying in a cylinder. To provide a liquid discharge method and a liquid discharge apparatus capable of discharging liquid.

  The present invention relates to a liquid discharge method, a liquid filling step of filling a liquid tank with a moisture curable adhesive filled in a liquid tank by pressure, and air in the cylinder from an exhaust port provided in the upper part of the cylinder. The exhaust air exhausting step, the exhaust port closing step for closing the exhaust port, the rotating step for rotating the rotor and the screw portion provided on the rotor, and the moisture curable adhesive in the cylinder are quantitatively measured from the nozzle portion. And at least a liquid discharge step for discharging the liquid.

  Further, the rotor and the screw portion provided on the rotor are formed of a resin material having a water absorption rate of 0.1% by weight or less.

  Furthermore, the present invention includes at least a liquid tank that stores liquid, a cylinder that can be filled with the liquid, and a rotor that is inserted into the cylinder and that can rotate about a substantially central axis of the cylinder as a rotation axis. The rotor has a screw part spirally provided along the outer peripheral surface of the rotor so that the liquid filled in the cylinder can be mixed and stirred, and the liquid is supplied from a nozzle part integrally formed or attached to the cylinder. The liquid is a moisture curable adhesive, and the cylinder is provided with an exhaust port communicating with the inside and outside of the cylinder, and the exhaust port is closed with a closing lid. It is characterized by.

  Further, the rotor and the screw portion provided on the rotor are formed of a resin material having a water absorption rate of 0.1% by weight or less.

  The resin material is one or more resin materials selected from polyethylene, polypropylene, polyphenylene sulfide, and polystyrene.

  According to the first configuration of the present invention, there is provided a liquid discharging method, in which a liquid filling step of filling a liquid tank with a moisture-curing adhesive filled in a liquid tank by pressure, and an exhaust provided in an upper portion of the cylinder. An air discharge step of discharging air in the cylinder from the opening, an exhaust port closing step of closing the exhaust port, a rotating step of rotating the rotor and a screw portion provided on the rotor, and a moisture-curing adhesive in the cylinder Since the air in the cylinder is discharged by having at least the liquid discharge step of quantitatively discharging from the nozzle portion, the liquid can be stably discharged over time.

  Further, a liquid filling step for filling the cylinder with the moisture-curing adhesive filled in the liquid tank by pressure, and an air discharge step for discharging the air in the cylinder from the exhaust port provided in the upper part of the cylinder Since the moisture curable adhesive filled in the tank can be performed by a series of operations by the pressure filling the cylinder, there is an effect that no new equipment is required.

  Further, according to the second configuration of the present invention, the rotor and the screw portion provided on the rotor are formed of a resin material having a water absorption rate of 0.1% by weight or less, thereby moisture-curing moisture absorbed in the rotor. The solidification of the mold adhesive can be suppressed, and due to the synergistic effect with the air discharge step described above, the effect of suppressing the solidification of the moisture-curing adhesive by moisture is high, and a stable liquid discharge method can be obtained. Play.

  This is because, in order to form the rotor and the screw integrally, the structure is complicated, and therefore, it is preferable to use an injection-molded product of the molded product compared to the metal product. As a result, it was found that not only moisture in the air remaining in the cylinder but also moisture absorbed in the material reacts with the moisture-curable adhesive and solidifies. Therefore, in order to form the rotor with a resin material, such as forming the rotor and the screw integrally, a resin material having a water absorption rate of 0.1% by weight or less, suppressing water absorption, and having excellent temporal stability A discharge method is preferable.

  The resin material having a water absorption rate of 0.1% by weight or less is polyethylene (water absorption rate 0.01% by weight), polypropylene (0.01% to 0.03% by weight), polyphenylene sulfide (0.02% by weight). And polystyrene (0.03 to 0.05% by weight). Among these, polyphenylene sulfide is most preferable in view of chemical resistance and moldability, particularly dimensional stability.

  In addition, the water absorption rate in this invention can be calculated | required by measuring the weight increase rate after being immersed in 23 degreeC water for 24 hours according to ISO62.

  According to the third configuration of the present invention, at least a liquid tank that stores liquid, a cylinder that can be filled with the liquid, and a cylinder that is inserted into the cylinder and rotates about the central axis of the cylinder as a rotation axis. A rotor capable of mixing and stirring the liquid filled in the cylinder, and having a screw portion provided spirally along the outer peripheral surface of the rotor, and formed integrally with the cylinder. A liquid ejecting apparatus capable of ejecting liquid from an attached nozzle part, wherein the liquid is a moisture-curing adhesive, and an exhaust port that communicates the inside and outside of the cylinder is provided in the cylinder. By closing with the closing lid, solidification of the moisture-curing adhesive due to moisture in the air in the cylinder can be suppressed, and an effect can be obtained in which stable liquid ejection can be obtained.

  Moreover, according to the fourth configuration of the present invention, the rotor and the screw portion provided on the rotor are formed of a resin material having a water absorption rate of 0.1% by weight or less, thereby moisture-curing moisture absorbed in the rotor. The solidification of the mold adhesive can be suppressed, and due to the synergistic effect with the air discharge process described above, the effect of suppressing the solidification of the moisture-curing adhesive by moisture is high, and a stable liquid ejection device can be obtained. Play.

  This is because, in order to form the rotor and the screw integrally, the structure is complicated, and therefore, it is preferable to use an injection-molded product of the molded product compared to the metal product. As a result, it was found that not only moisture in the air remaining in the cylinder but also moisture absorbed in the material reacts with the moisture-curable adhesive and solidifies. Therefore, in order to form the rotor with a resin material, such as forming the rotor and the screw integrally, a resin material having a water absorption rate of 0.1% by weight or less, suppressing water absorption, and having excellent temporal stability A discharge device is preferable.

  According to a fifth configuration of the present invention, the resin material is made of polyethylene (water absorption 0.01% by weight), polypropylene (0.01% to 0.03% by weight), polyphenylene sulfide (0.02% by weight). ) And polystyrene (0.03 to 0.05% by weight), it is possible to suppress solidification of the moisture effect type adhesive due to water absorption. This is because the moisture absorption can be suppressed by 0.1 wt% or less, preferably 0.05 wt% or less, so that solidification of the moisture effect type adhesive can be suppressed. It is necessary to consider chemical resistance and moldability, particularly dimensional stability. Among these, polyphenylene sulfide is most preferable because of high moldability, particularly dimensional stability.

  In addition, although metal materials, such as stainless steel, aluminum, and a copper alloy, can be used for the cylinder of this invention, it is preferable to use stainless steel in view of pressure resistance, liquid resistance (corrosion resistance), and visibility.

  In addition, the moisture curable adhesive used in the present invention is not particularly limited and is a conventionally known resin having a property of being cured by moisture in the air, specifically, a polyurethane resin, a silicone resin, an epoxy resin, An adhesive containing a cyanoacrylate resin or the like can be appropriately selected and used. Among these, a moisture curable adhesive containing a polyurethane resin or a silicone resin is preferable from the viewpoint of adhesive strength and handleability.

  The present invention relates to a liquid ejection method and a liquid ejection method in which a moisture curable adhesive can stably eject liquid without solidifying in a cylinder in a liquid ejection apparatus including a rotor provided with a screw portion. The equipment could be provided.

FIG. 3 is a partially omitted vertical cross-sectional view illustrating the liquid ejection device according to the first embodiment. FIG. 2 is an enlarged vertical cross-sectional view of a main part showing a state before the closing lid is attached, partially omitted in FIG. 1.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same number is attached | subjected about the same member and the same component in drawing. In the present invention, “front” indicates the nozzle part side that discharges liquid in the longitudinal direction of the cylinder, and “rear” indicates the opposite side.

  1 and 2 includes a stainless steel liquid tank 2, a stainless steel cylinder 5, a polyphenylene sulfide rotor 4, and a stainless steel nozzle 9. As shown in FIG. A solenoid valve (not shown) is connected to the liquid tank 2 by being connected to a hose. The solenoid valve is connected to a pressure regulator (not shown) that adjusts the air pressure of the compressed air supplied from the pneumatic pressure source to an appropriate air pressure. Further, a pressure transfer plunger (not shown) is provided inside the liquid tank 2, and a viscous liquid (not shown) is stored between the pressure transfer plunger and the discharge port.

  Further, the rotor 4 (water absorption rate, 0.02% by weight) made of polyphenylene sulfide is a molded product integrally provided with a screw portion 4A capable of stirring the liquid introduced into the cylinder 5 at its shaft portion. The motor is connected to a motor (not shown) disposed in the motor-covered cylinder 10 and is rotatably inserted into the cylinder 5. A cap 8 and a nozzle 9 are attached to the tip of the cylinder 5. Further, the motor-covered cylinder 10 and the cylinder 5 are connected via a packing (not shown) so that air in the motor-covered cylinder 10 does not enter the cylinder 5.

  Further, a supply hole for introducing liquid is formed on the side surface of the cylinder 5, and a liquid supply unit 3 in which the discharge port of the liquid tank 2 is coupled is provided in the supply hole. Further, the cylinder 5 is a liquid discharge apparatus 1 equipped with a discharge port 6 for removing air on a side surface behind the rotor 4 and a closing lid 7 for completely closing the exhaust port 6.

Next, the operation will be described.
When the pressure regulator is connected to the air pressure source and the solenoid valve and the motor are operated, the moisture curable adhesive consists of a discharge port and a supply hole in a pressurized state by the set output air pressure entered in the liquid tank 2 It enters the cylinder 5 from the liquid injection part 3. At this time, the air in the cylinder 5 is discharged from the exhaust port 6 along with the filling of the moisture curable adhesive.

  Next, after the air in the cylinder 5 is exhausted, a closing lid 7 is attached to the exhaust port 6 to completely close the exhaust port 7, so that moisture-curing adhesive leaks from the exhaust port 6 and the air leaks. Prevent entry.

  After that, the moisture-curing adhesive in the portion surrounded by the inner wall of the cylinder 5 and the screw part 4A of the rotor 4 is compressed as it goes in the direction of the nozzle 9 by the pressure of the rotor 4 rotating at a low speed by DC servo control. It can be poured out from the nozzle 9. In addition to the screw portion 4A for inducing liquid, the rotor 4 is provided with a backflow prevention screw 4B having a pitch smaller than the screw portion 4A, two wedge-shaped projecting pieces (not shown), and a flange (not shown). Is provided.

  In this way, the liquid-inducing screw portion 4A is gradually formed smaller as the screw pitch goes to the nozzle 9 side, which is the front end side, so that the pressure increases on the front end side of the rotor 4 and the discharge performance is excellent. Can be In addition, since the backflow prevention screw portion 4B having a smaller pitch than the screw portion 4A for guiding the liquid is provided in the rotor 4, a part of the viscous liquid introduced from the liquid supply portion G is the transfer direction of the rotor 4 due to the pumping pressure. Even if it tries to flow backward to the opposite rear end side, it does not easily pass through the backflow prevention screw 4B due to the viscous resistance of the liquid itself. 4 Block backflow of viscous liquid to the rear end side.

Test and Evaluation The liquid discharge device 1 obtained in the embodiment, and a liquid discharge device A (not shown) in which the rotor and screw part are polyacetal (water absorption rate, 0.3% by weight), discharge time 10 seconds, After 5.0 g from the discharge port at a tank pressure of 300 kPa and a rotation speed of 100 rpm, after a week at 23 ° C. and 50% RH, the inside of the cylinder and the rotor is visually observed and the number is the same as the application conditions described above from the discharge port. As a result of the shot application, the liquid discharge device 1 was quantitatively discharged even at the initial stage and after one week, and stable liquid discharge was obtained. On the other hand, the liquid discharge device A was initially capable of quantitative discharge, but after one week, solidification of the moisture-curable adhesive between the cylinder and the rotor was observed, and stable quantitative discharge could be obtained. There wasn't.

  The present invention can be widely used as a liquid ejection method and apparatus using a moisture curable adhesive.

DESCRIPTION OF SYMBOLS 1 Liquid discharge apparatus 2 Liquid tank 3 Liquid supply part 4 Rotor 4A Screw part 4B Backflow prevention screw part 5 Cylinder 6 Outlet 7 Closure lid 8 Cap 9 Nozzle 10 Motor covering cylinder

Claims (5)

A liquid discharging method, in which a moisture curable adhesive filled in a liquid tank is filled into the cylinder by pressure, and air discharge is performed to discharge the air in the cylinder from an exhaust port provided in the upper part of the cylinder. A step of closing the exhaust port, a step of rotating the rotor and a screw portion provided on the rotor, and a liquid for quantitatively discharging the moisture-curing adhesive in the cylinder from the nozzle portion A liquid discharge method comprising at least a discharge step. The liquid ejection method according to claim 1, wherein the rotor and the screw portion provided on the rotor are formed of a resin material having a water absorption rate of 0.1 wt% or less. At least a liquid tank that stores liquid, a cylinder that can be filled with the liquid, and a rotor that is inserted into the cylinder and that can rotate about a substantially central axis of the cylinder as a rotation axis. The liquid filled in the cylinder can be mixed and stirred, and has a screw part spirally provided along the outer peripheral surface of the rotor, so that the liquid can be discharged from a nozzle part integrally formed or attached to the cylinder. A liquid ejection apparatus, wherein the liquid is a moisture curable adhesive, and the cylinder is provided with an exhaust port communicating with the inside and outside of the cylinder, and the exhaust port is closed with a closing lid. Discharge device. The liquid ejecting apparatus according to claim 3, wherein the rotor and the screw portion provided on the rotor are formed of a resin material having a water absorption rate of 0.1 wt% or less. The liquid discharge apparatus according to claim 4, wherein the resin material having a water absorption rate of 0.1% by weight or less is at least one resin material selected from polyethylene, polypropylene, polyphenylene sulfide, and polystyrene.

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