JP2992760B2 - Method for deflecting and distributing liquid or melt flowing out of a nozzle hole by gas jet from surrounding area - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a liquid or melt flowing out of a nozzle hole, which is struck by a gas flow ejected from the periphery thereof, thereby causing the liquid or melt to flow. And a device for distributing the flow of water in a desired direction.

[Conventional technology]

Conventionally, there has been the following method for deforming a spray pattern of a liquid or a melt flowing out of a nozzle hole with a compressed gas.

First, in a commonly performed two-fluid spray (air spray) or airless spray, the spray pattern is changed from both sides in order to change or adjust the shape of a spray pattern such as a coating agent flowing out of a nozzle hole. Blow compressed gas (25A
And FIG. 25B), there is a method of transforming the spray pattern into a desired pattern. In the airless spray, it is called an air mix or an air assist airless spray. In each of these methods, air is blown from the side to the spray pattern flowing out of the nozzle hole, thereby deforming the shape of the spray pattern widely, and applying the spray pattern to the workpiece while promoting the formation of particles. . In this case, the obtained pattern was one, that is, a single pattern.

Next, there is a method called “Swirl spray” which is performed recently in the melt. In this method, for a melt discharged downward linearly from a nozzle hole, a plurality of gas ejection holes provided at equal intervals around the hole are used to supply heated compressed gas to the linear melt. The linear melt was sprayed so as to be substantially in contact with the outer periphery, lowered while spirally swirling, and coated on the surface of the object to be coated (see FIG. 26). In this method, only a single spiral coating pattern was obtained.

In the above conventional methods, as a result, only a single pattern was obtained from one nozzle. For example, as shown in FIG. 21A, a plurality of dot-like patterns by hot melt adhesive or the like,
A desired number of nozzles and guns were required to obtain a composite pattern such as a plurality of spray-like patterns as shown in FIG. 21B. That is, equipment, man-hours, maintenance, etc. are required according to the number of nozzles and guns,
Naturally, this led to an increase in cost.

Further, regarding the spray from the nozzle hole of the liquid or the melt described above, as shown in FIG. 22A, the spray flow (SP ₂ ) hits the surface of the work (W ₂ ) and is reflected (SPr). ). Then, when they are continuously sprayed, a reflective flow layer (Rl) having a constant thickness is formed on the object to be applied, and collides with the subsequent spray flow and scatters due to re-reflection and the like. In other words, the sprayed fine particles (W ₂ )
It is said that only a few reach it, and the amount is less than half. And as can be seen in FIG. 22B, the periphery of the spray pattern is blurred. In addition, the scattered fine particles contaminate the working environment and cause pollution. In particular, in the case of spray coating on a concave portion, a narrow portion, a corner portion in a can, or the like, the above-mentioned obstructive action, ie, action, due to the reflected current is so great that uniform coating was impossible.

[Problem to be solved]

As described above, in order to obtain a plurality of patterns, the same number of guns and nozzles as the number of patterns are required. Particularly, when forming a composite pattern obtained by combining these multiple patterns, there are the following problems. Was.

(1) It is necessary to prepare not only a plurality of, i.e., a large number of guns and nozzles, but also a large number of devices for operating each of them.
Equipment costs are increased.

(2) For maintenance of many devices in the above section,
Requires a lot of man-hours.

(3) The same number of detection devices as the number of guns and nozzles is required, such as a flow monitor, and the cost and maintenance man-hours are increased.

(4) When a large number of guns and nozzles need to be sprayed in a narrow space for an object to be coated having a small shape, the operation may not be possible if the space is limited.

(5) In particular, when an air spray is used, the jet flow of the air impinges on the surface of the object to be reflected and generates a turbulent flow, so that the flow of the sprayed atomized particles (fine particles) is disturbed and uniform. Often not applied. In particular, it is impossible to apply the composition to a narrow portion, a concave portion, a corner in a can, or the like.

The motivation of the present invention was to solve the above-mentioned problems of the prior art, that is, the above five items. (1) In obtaining a composite pattern in which a plurality of patterns are composited, a method of using a single gun, a nozzle, and ancillary equipment is provided to reduce equipment costs.

(2) From the above, maintenance will be performed on only a single gun, nozzle, and its associated equipment to reduce man-hours.

(3) From paragraph (1), prepare a single detection device such as a flow monitor to reduce equipment costs and man-hours.

(4) From (1), spray coating is easily performed in a limited space.

(5) Provided is a method for performing spray coating sufficiently even on a narrow portion, a concave portion, or a corner in a can on a surface of an object to be coated.

And so on.

Accordingly, it is an object of the present invention to provide a method and apparatus for obtaining a composite pattern obtained by combining a plurality of ejection patterns by using a single gun, a nozzle and ancillary equipment.

[Means for solving the problem]

The gist of the present invention is to provide a plurality of, preferably 6 to 36, distribution gas jets from the periphery of the nozzle holes with respect to the outflow of liquid or melt flowing out of at least one nozzle hole. The liquid or the melt is diverted toward the required direction while deflecting the direction of the effluent flow of the liquid or the melt by the kinetic energy of the compressed gas at a predetermined timing and spraying. This is a method of obtaining a desired composite pattern composed of a plurality of ejection patterns.

Next, the method of the present invention will be described. The method of the present invention
Each species is described below.

First Method The first method is a method for obtaining a dot-like composite pattern. Please refer to FIG. The liquid or the melt (hereinafter, the term “melt” is simply abbreviated to “liquid”) (L) is pressurized by gravity or a pressure tank, a pump (32), or the like, and is supplied through a liquid supply valve (25). (1) Valve chamber (2) in gun (1) from liquid supply port (9) above
Flows into. The liquid (L) flows out through the nozzle hole (5) in the nozzle (11) by the "open" of the liquid on-off valve (3) in the same room. At this time, liquid (L)
When a liquid having a high cohesive force, that is, a relatively high-viscosity liquid (for example, a rubber-based liquid substance or a hot-melt adhesive) flows out under a relatively low pressure, the outflow becomes linear discharge flow (Le).
Becomes The plurality of distribution gas injection holes (13a, 13b,..., 13f) provided around the nozzle hole (5) (see FIG. 2) with respect to the linear discharge flow (Le). Independently, for example, one compressed gas is jetted out one by one, and the gas jets (SPa, SPb,..., SPf) are struck against the linear outflow (Le) of the liquid, whereby the liquid linear The discharge stream (Le) is merged with the gas jet stream (SPa ′, SPb ′,..., SPf ′) and deflected to distribute the liquid in a desired direction. Here, FIG. 3 is a plan view showing a state in which the liquid is distributed on the surface of the workpiece (W). As shown in the figure, when a linear outflow (Le) of a liquid having a high cohesive force is distributed, a dot-like pattern can be obtained by adjusting the pressure of the gas to be distributed.

Second Method A second method is a method of obtaining a spray-like composite pattern of atomized liquid. In the case of the first method described above,
Although the liquid to be handled has a relatively high viscosity, the second method uses a relatively low-viscosity liquid (eg, a solvent,
By using a coating agent, an emulsion, an oil, a liquefied gas, etc., and atomizing when flowing out of the nozzle hole, a spray-like coating pattern as shown in FIG. 4 can be obtained. Regarding the atomization of the liquid, an air spray nozzle (40) is attached to the gun (1) on FIG. 1 as shown in FIG. 1A, or a two-fluid spray type is used as shown in FIG. It can be atomized by using a gun (41). That is, an atomizing gas ejection hole (58) is provided around the nozzle hole (45) from which the liquid flows, and the liquid flowing out of the nozzle hole (45) in the nozzle (51) by the atomizing gas is formed. Atomized and sprayed (SP
L). The spray flow (S
PL) in the same manner as in the first method described above, from the plurality of distribution gas ejection holes (53a, 53b,..., 53f) provided around the nozzle hole (45). The spray gas (SPa, SPb,..., SPf) is blown for the purpose, and the spray flow (SPL) is deflected in a required direction and distributed to obtain a desired composite spray pattern (see FIG. 4). It is done.

Next, an apparatus based on the above-described method of the present invention will be described. The feature of this device lies in its nozzle. The nozzle includes an extrusion nozzle, an airless spray nozzle, a two-fluid spray nozzle, and the like.

First, the apparatus of the present invention equipped with an extrusion nozzle will be described. Please refer to FIG. 1 and FIG. There is a liquid nozzle hole (5), that is, a discharge hole, at the center. Around the hole, a compressed gas outlet for distribution (13
a, 13b, 13c, ...). These ejection holes are provided such that their center lines substantially intersect with the center lines of the nozzle holes (5). And the root of the above-mentioned distribution gas ejection hole is a compressed gas supply hole (14a, 14b, 14c,
…) And their supply holes are connected to the pipe joints (15a,
15b, 15c, ...) and their pipes (16a, 16b, 16c, ...) are connected to solenoid valves (23, 24) via flow control valves (17a, 17b, 17c, ...). The solenoid valve (2
The valve section (3, 24) is connected to the compressed gas generation source (30) by piping, and the solenoid section is electrically connected to the timer (21). In practice, it is desirable to use a pulse controller as the timer. The reason is that the millisecond unit can be set in a pulsed manner and easily.

Next, the gun (1) to which the extrusion nozzle (11) is attached will be described. A liquid supply port (9) to the liquid passage (2) inside the gun is provided with a liquid supply valve (2).
The liquid tank (3) communicating with the liquid pump (32) via 5)
1) or connected to the pressurized liquid tank (36), and in some cases, to the gravity pressurized tank (34).

If necessary, return to the downstream portion of the liquid passage (2) and the upstream portion of the liquid on-off valve (3) to return the piping port (10).
The piping is fed back to the inlet of the liquid pump (32).

The stem of the liquid on-off valve (3) on the liquid passage (2) in the gun (1) is integrated with the piston rod in the operating air cylinder (6), and the operating air is supplied to the air cylinder. Is connected to the valve section of the solenoid valve (22) by a pipe (20), and the solenoid section is electrically connected to a timer (21).

Although the above nozzle (11) is an extrusion nozzle, when these airless spray nozzles are used,
As shown in FIG. 1A, the nozzle (40) may be attached.

Next, in the case of using a two-fluid spray nozzle, as shown in FIG. 5, an ejection hole (58) for atomizing air is provided outside the nozzle hole (45) for liquid. Around them, a plurality of compressed gas outlets for distribution (53a,
Needless to say, 53b, 53c, ...) are provided. And these distribution compressed gas ejection holes (53a, 53b, 53c, ...)
The supply pipes (56a, 56b, 56c, ...) are connected to the flow control valves (57a, 57b, 57c) by the supply pipes (56a, 56b, 56c, ...).
c,...) are connected to the solenoid valves (63, 64) and the like as in the case described above. The same applies to the piping (60) to the operating air cylinder (46). However, in the case of this apparatus, a supply pipe (67) for compressed gas for atomization is provided, and this pipe is connected to a solenoid valve (66) via a flow control valve (68). Connected to a power source (70), and the solenoid is connected to a timer (6
The difference is that it is electrically connected to 1).

[Action]

First, the case of mounting an extrusion nozzle will be described. Please refer to FIG. The liquid (L) is supplied to the valve chamber (2) inside the gun (1) at a required constant pressure by a pump (32) or the like. When the liquid on-off valve (3) is "open", the liquid is supplied. A U-turn is made and fed back to the suction port of the pump (32) to circulate under a constant pressure. By the way, the controller (2
According to the signal from 1), the solenoid valve (22) for opening and closing the gun (1) is operated "open" for a required time at a required time, and the operating air is directly connected to the gun (1). (6), the air piston (7) moves upward against the spring (8), and opens the liquid on-off valve (3) directly connected to the piston rod. The liquid passes through the valve, passes through the nozzle hole (5), and is discharged to the outside through the opening at the tip. The shape of the liquid at that time is
The liquid is discharged in a substantially linear shape along the center line of the nozzle hole (5) (Le).

In response to the above-described liquid discharge timing, and also by opening a solenoid valve (23 and 24) for dispensing gas for distribution in response to a signal from the pulse controller (21), toward the linear discharge flow (Le), Compressed gas is ejected from one of the plurality of distribution gas ejection holes, and the ejection flow (for example, the ejection flow (SPa) ejected from the ejection hole (13a)) hits, and the force of these flows is reduced. Flow in the synthesis direction. However, since the flow of the distribution gas jet is short (on the order of two digits of millimeters), the amount of discharge and deflection is relatively small.
The dots are distributed on the surface of the substrate (W) (A ₁ in FIG. 3). Next, the supply of gas to the distribution gas ejection holes (13a) is stopped and the ejection is stopped, and the gas is supplied to the next distribution gas ejection holes (13b), ejected, and subsequently ejected. Upon hitting the incoming discharge flow (Le), it is deflected this time in a different direction from before, and is distributed in a dot shape adjacent to the previous position (B ₁ in FIG. 3). In this manner, when the number of the distribution gas ejection holes is six, the six liquid aggregates are sequentially distributed to different locations one by one.

The above description is of the operation in the case of the extrusion nozzle. Next, the case of the airless spray will be described. In the airless spray, the liquid ejected from the nozzle hole of the nozzle is in the atomization or in the process of atomizing near the opening of the nozzle hole. When the distribution gas jet is struck against these spray flows, the direction of the jet spray flow is deflected, as in the case of the discharge flow described above. By sequentially performing this, a pattern of fog droplets as shown in FIG. 4 is distributed. Note that the spraying of the distribution gas jet also has a derivative effect that the spray droplets during spraying are made finer.

In the above description, six distribution gas jets are sequentially jetted one by one as an example. However, if necessary, one gas jet is skipped (in this case, the number of gas jet holes is odd).
Alternatively, the desired composite pattern can be obtained by arbitrarily squirting from these gas squirting holes, such as squirting a plurality of adjacent ones simultaneously.

Next, FIG. 7 shows an example of the timing of the outflow of the liquid and the independent ejection of the distribution gas to obtain a dot pattern. TLm in the figure indicates the outflow timing of the liquid. When the signal from the pulse controller (21) shown in FIG. 1 indicates that the operation of the solenoid valve (22) is "open", the operation air is released. The liquid is introduced into the air cylinder (6) directly connected to the gun (1) to adjust the outflow of the liquid. Also, TSP _a , TSP _b ,..., TSPf on FIG. 7 are solenoid valves which are operated by a signal from the pulse controller (21) in FIG. (23 and 24) shows an example of the timing at which the distribution gas is supplied to each of the plurality of distribution gas ejection holes one by one. In the figure, the outflow time of the liquid is determined by the number of gas ejection holes for distribution (6 in the figure).
This is an example in which the distribution gas is sequentially ejected from each ejection hole for a period of time equally divided by the number of nozzles.
SPa) and the timing of the next vent hole 13b
The timing of “13c” is made to correspond to “TSPc”,. That is, the ejection flow (SPa) ejected from the ejection hole (13a) hits the liquid linear ejection flow (Le), flows in the direction in which the forces of those flows are combined, and the object to be coated (W)
It is applied on the surface (A _{1 in} FIG. 3). Next, the supply of gas to the gas ejection holes (13a) is stopped and the ejection is stopped,
The gas is supplied to the next ejection hole (13b) and ejected, and the direction of the flow of the liquid linear ejection flow (Le) is changed so that the liquid is applied to a position different from the distribution position. (B _{1 in} FIG. 3). Thus, when there are six gas ejection holes, six liquid aggregates are sequentially distributed to different locations one by one. At this time, according to the ejection timing of the liquid and gas in FIG. 7, the order of application is “A ₁ , B ₁ , C ₁ , D ₁ , E ₁ , F ₁ ” in FIG. However, it is needless to say that the order can be deflected by changing the timing. If necessary, if the gas ejection from the periphery of the liquid linear discharge flow (Le) is completely stopped, the discharge flow (L
e) flows vertically, as shown by the phantom line in FIG.
It is also distributed in a dot shape at the center of the six aggregates. In this case, the timing of the outflow of the liquid and the ejection of the gas may be such that the start of the ejection of the distribution gas is delayed from the start of the outflow of the liquid, as shown in FIG.

In the case where the continuous liquid discharge flow is sequentially turned by gas ejection and distributed as in the timings shown in FIGS. 7 and 8, the direction of the liquid linear discharge flow (Le) described above is used. Since the previous flow direction remains slightly during conversion, a strictly dot-shaped pattern such as “Ca” and “Cb” in FIG. 6 is obtained.

FIG. 9 shows an example of the timing of the outflow of the liquid and the ejection of the gas for distribution and the gas for atomization in the two-fluid spray method for obtaining the spray pattern. Here, TSPg in the figure is a gas for atomizing liquid in a two-fluid spray,
That is, it shows the ejection timing from the atomizing gas ejection holes (58) in FIG. Thereafter, the liquid is distributed in the same manner as in the case of the above-mentioned dot-shaped pattern, and “D” in FIG.
A spray pattern with tails such as "a" and "Db" is obtained.

In the above description, the gun (41) and the nozzle (51) are of a two-fluid spray type, and the solenoid valve (66) for supplying the atomizing gas is provided. Except for the electrical connection, there is no difference from the case of the above-mentioned dot-shaped pattern, and a description thereof will be omitted.

Note that the plurality of distribution gas jets (SPa, SPb,..., S
In order to eject Pf) sequentially, the supply of these distribution gases must be controlled by a pulse controller (61), etc., via solenoid valves (63, 64), etc. Is the same as

In the above description, the liquid is continuously discharged and the gas for distribution is intermittently ejected. However, the liquid is also intermittently discharged and the gas to be distributed in each direction is ejected correspondingly. Can also. Examples of the timing in that case are shown in FIGS. FIG. 10 shows that the jetting of the atomizing gas (TSPg) in the two-fluid spray type is intermittent in correspondence with the intermittent liquid outflow. FIG. 11 shows that the jetting of the atomizing gas is continuous. It is what it was. In this way, by making the outflow of the liquid intermittent and hitting each distribution gas, the previous flow direction does not remain at the time of changing the direction of each spray flow (SPL), that is, the sharpness is good. A circular spray pattern such as "Dc" and "Dd" is obtained. This is an example of a case where the liquid is atomized. In the above-described dot pattern, similarly, a round dot pattern such as “Cc” and “Cd” in FIG. 6 can be obtained. It is.

Also, in the above description, the distribution gas ejection holes are 6 holes.
The obtained pattern was circular (a circular pattern like “Ca” to “Dd” in FIG. 6),
By increasing the number of the distribution gas outlets, the sixth
An annular (doughnut-shaped) pattern as shown by "Ea" in the figure can also be obtained. In each of the above examples, the ejection angle, ejection pressure, and ejection time of each gas are the same, but by changing them for each distribution gas ejection flow, “Eb” in FIG. , "Ec", "Ed" can be obtained. Although FIG. 2 shows the case where the liquid is atomized, the present invention can be applied to the case of the dot pattern described above. Further, the number of gas outlets for distribution is desirably from 6 or more as described above to a maximum of 36 for convenience of design. Further, if the ejection time of the ejection gas is 500 milliseconds or more, the interference (air cushion) due to the reflected air current occurs as described in the related art, and therefore 500 milliseconds or less, preferably 4 to 50 milliseconds. The range of seconds was experimentally good. The direction of the distribution gas ejection flow with respect to the liquid outflow may be crossed and merged as described above, or may be brought into contact to apply a torsional force to the liquid outflow. This is particularly effective for dot-shaped coating, that is, for deflecting a linear discharge flow (Le) of liquid.

〔Example〕

First Embodiment In the above-described first method and second method, the gas is independently ejected from each distribution gas ejection hole.
It is also possible to form a set of two or more distribution gas ejection holes existing at an angle within 0 degree and eject the gas at the same timing. By this method, atomization can be promoted.

Second Embodiment In the first and second methods described above, the number of liquid nozzle holes is one, and therefore, only one kind of liquid flows out. However, in this embodiment, a plurality of nozzle holes are used. Nozzles, each of which is a nozzle hole for a plurality of types of liquids, and the plurality of nozzle holes are provided concentrically (see FIGS. 12 and 13) or close to each other (see FIG. 14). It is what is being done. Therefore, a plurality of types of liquids flowing out from the plurality of nozzle holes are mixed and merged when they flow out. According to this method, it is possible to say that a liquid that is easily solidified when mixed in advance, such as a curing agent, is more effective.

Third Embodiment A liquid aerosol (aerosol) is mixed into the atomizing gas jet stream and / or the distribution gas jet stream in the first and second methods described above. See FIG. The figure shows a fogging device (121 or 126) as a fogging gas generating means, and the device is distributed to the atomizing gas supply pipe (124) and / or from the gas compressor (110). It is attached to the supply gas supply pipe (125). Instead of the aerosol generator, a simpler liquid spray nozzle may be provided in the gas supply pipe (124 or 125).

Examples of the liquid of the aerosol to be mixed include a solvent, a catalyst, a curing agent, a liquefied gas, and the like. The solvent has an effect of self-cleaning the nozzle holes and the gas ejection holes for distribution. Further, the catalyst and the curing agent are effective for vapor curing which is known to add an amine to an epoxy paint. As for the liquefied gas, when the gas mixed with the liquefied gas collides with the liquid, high energy is obtained by expansion, so that atomization can be promoted. Alternatively, liquid fine particles can be frozen and granulated. The present embodiment can also be applied to a method recently proposed by Taiyo Oxygen Co., Ltd. and Mitsubishi Electric Co., Ltd., in which pure water is sprayed into liquid nitrogen to produce frozen particles and clean the wafer. it can. Also, Gunma University etc.
LAS'78 (International Conference of Liquid Atomaiz
The present embodiment can be applied more simply and efficiently to the method of freeze granulation of liquid using liquid nitrogen, which has been contributed to ation and Spray system 1978).

It is clear that different aerosols can be mixed into the above-mentioned atomizing gas and the respective distribution gases, since these pipes may be separated.

Fourth Embodiment In the first method described above, a melt can be used as a liquid. The melt to be symmetrical in the present invention is a thermoplastic resin, more specifically, a material having a relatively low viscosity at 200 ° C. or lower, such as a hot melt adhesive or a wax, is easily applied.

Next, dot-shaped application in a hot melt adhesive will be described. In the conventional application of a hot melt adhesive, a linear coated object has been obtained by moving an object to be coated while intermittently discharging from a nozzle hole. However, by applying the method of the present invention, the hot melt adhesive can be scattered in the form of dots in a plane.
For example, a hot-melt adhesive is discharged from a nozzle for distributing dots as shown in FIG. 16 “Ga”, and by moving an object to be coated, a dot band application can be made as shown in “Gb” in FIG. Further, if a plurality of the nozzles are arranged and ejected, it is possible to easily perform the surface application as indicated by “Gc” in FIG.

Although the above-mentioned dot-shaped patterns are the simplest, various patterns and their band-shaped or planar coating can be performed by adjusting each distribution gas.
FIG. 17 shows several examples of these application examples.

Fifth Embodiment In the above-described second method, a conventional electrostatic coating method can be applied. That is, when the liquid is supplied to the gun, the liquid may be directly charged with static electricity, or a corona pin may be attached near the nozzle opening of the liquid to charge the liquid when dispensing. Needless to say, the effect of charging the liquid is to promote atomization of the liquid to make finer fine particles and to improve the adhesion to the object to be coated.

Sixth Embodiment The most effective example of the above-mentioned second method is coating a metal container. In particular, metal beverage cans and the like are required to have a complete and uniform coating for the purpose of preventing metal elution into the container and not impairing the aroma and taste. In the conventional in-can coating method, as shown in FIG. 23, the can is rotated about its central axis and sprayed from the spray nozzle (191) toward the bottom inside the can. The sprayed coating agent at that time is applied evenly instantaneously, but due to the centrifugal force caused by the rotation of the can, as shown in Fig. 24, the coating agent applied on the dome (Dm) surface is It moved outward and was collected (Lc) in the corners of the can, and the coating on the bottom was uneven.

Therefore, an example in which a coating agent is applied in a can by applying the method of the present invention will be described. First, adjustment is made so as to distribute to a spray pattern as shown in FIG. Such a nozzle (141) is inserted toward the bottom of the can (CAN) and sprayed (see FIG. 19). At this time, since the spray flow is distributed by changing the direction by each distribution gas, the reflected flow is small, and the spray flow is converted and applied to other parts in a short time (less than 20 milliseconds). Air cushion hardly occurs, and the round time of the application process is about
120 milliseconds. According to this method, it is not necessary to rotate the can in the conventional manner. Even if it rotates, relatively low rotation (600 rpm or less) is sufficient, and high speed rotation (1800
33700 rpm), so the effect of centrifugal force is extremely small. When the can is stationary, seven circular spray patterns are sequentially applied to the bottom of the dome and its corners. If the nozzle (141) is moved upward ("U") while the can is fixed, the entire wall surface in the can can be uniformly applied.

Further, as described above, the coating can be performed without moving the nozzle. See FIG. In its first path (“S ₁ ”) in the direction of movement (“V”) of the chain conveyor (CC), a coating agent is dispensed from the nozzle (151) towards the bottom of the can, and then its second In the process (“S ₂ ”), the nozzle (161) is applied toward the center of the can. Finally, in the third process (“S ₃ ”), the nozzle (1) is applied.
By applying the liquid toward the upper part of the can from 71), the entire wall surface in the can can be uniformly applied even when the nozzles (151, 161, 171) are fixed. The application time in each process is within 120 seconds as described above.

〔effect〕

By using the method of the present invention, a liquid or a melt flows out from one nozzle, and a plurality of distribution gas jets are blown against the outflow, thereby changing the direction of the outflow in a plurality of directions. Instead of this, a plurality of patterns can be synthesized by spraying or applying to different positions, and a variety of required patterns can be arbitrarily obtained from one nozzle. This can be said to be a new coating method, and it can be said that the effect is great because the coating can be performed with the use of a small number of devices in terms of economy.

As a secondary effect, short time (500 ms or less)
Since the spray coating is applied to the spots, there is no reflected flow from the surface of the object to be coated by the atomizing gas as in the case of the conventional continuous spray coating, that is, there is no air cushion effect, and the spray coating can be performed efficiently. You can. In addition, a liquid aerosol can be mixed into the above-mentioned gas jet for distribution to perform self-cleaning of the nozzle and acceleration of curing of urethane-based material and the like.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an extrusion nozzle according to the present invention and a system diagram of a device attached thereto. FIG. 1A is a side sectional view of an airless spray nozzle according to the present invention and a system diagram of a device attached thereto. "A" on the above figure
FIG. 3 is a view on arrow “B”-“B” in FIG.
FIG. 5 is a plan view in which a dot pattern is applied by the apparatus shown in FIG. 1. FIG. 5 is a side sectional view of a two-fluid spray nozzle according to the present invention and a system diagram of a device attached thereto. FIG. Examples of Various Application Patterns Obtained by Steps FIG. 7, FIG. 8, FIG. 9, FIG.
FIG. 12 shows various timing graphs of outflow of liquid and ejection of gas according to the present invention. FIG. 12 is a side sectional view of an airless spray nozzle for multiple liquid mixing spray. FIG. FIG. 15 is a front view of a two-fluid spray nose for liquid mixing spray. FIG. 15 is a system diagram of a device for mixing a liquid aerosol into atomization gas in the third embodiment.
And FIG. 17 are various examples of the coating pattern obtained by the method of the fourth embodiment. FIG. 18 is an example of the spray pattern used in the FIG. 6 embodiment. FIGS. 19 and 20 are explanations of the sixth embodiment. FIG. 21A is an example of a dot pattern applied by a conventional method. FIG. 21B is an example of a spray pattern applied by a conventional method. FIG. 22B shows the spray pattern obtained by the above method.
Fig. 24 is an illustration of a conventional method for coating the inner wall of a can.
FIG. A is an explanatory view of a so-called pattern air blowing method in which gas is blown from both sides to a conventional air spray.
FIG. B is a view taken in the direction of the arrow “I” on the upper figure, showing a state in which a circular pattern is transformed into an ellipse. FIG. 26 is a side sectional view showing a conventional swirl spray method. , 81 …… Gun, 11,51,91,141,151,161,171 …… Nozzle, 5,45,85 …… Nozzle hole, 13a, 13b,…, 53a, 53b,…, 93
a, 93b, distribution gas ejection hole, SPa, SPb, distribution gas ejection flow, 58, atomization gas ejection hole, 40, airless spray nozzle, Le, liquid linear discharge flow, SPL … Liquid spray style, CAN …… Cans

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B05D 1/02 B05B 1/26 B05B 7/06

Claims (5)

(57) [Claims] 1. A plurality of compressed gas injection holes provided around a nozzle hole (5) for an outflow (Le) of a liquid or a melt from at least one nozzle hole (5). (13a, 13b, ...) from the gas jet for distribution (SPa, SPb,
…) Are ejected independently of each other to strike or contact the outflow (Le) of the liquid or melt, thereby deflecting the flow of the outflow of liquid or melt, and at the same time, plume (SPa ', SPb', ... ) distributed in a direction that requires a ride, they distributed plurality of patterns _{(a 1, B 1, ...} , or a _2, B _2, ...) of A method of deflecting and distributing a liquid or a melt flowing out of a nozzle hole by a gas jet from the periphery thereof, wherein a desired composite pattern is obtained by composite. 2. The liquid or melt effluent is ejected by a two-fluid spray method.
A method for deflecting and distributing a liquid or a melt flowing out of a nozzle hole according to claim 1 by a gas jet from the periphery thereof. 3. A plurality of compressed gas jetting holes for distribution, which are provided around the nozzle orifice (5) for discharging a liquid or a melt, at an angle within 120 degrees. 3. A gas jet flow from the periphery of a liquid or a melt flowing out of a nozzle hole according to claim 1 or 2, wherein the compressed gas jet holes for distribution are jetted simultaneously as a set. A method of deflecting and distributing by 4. A distribution gas jet (SPa, SPb,
) Or one of the atomizing gases in the two-fluid spray type, wherein a single or plural kinds of liquid aerosols are contained. Item 4. The method according to item 3 or 3, wherein the liquid or the melt flowing out of the nozzle hole is deflected and distributed by a gas jet from the periphery thereof. 5. The method according to claim 1, wherein the liquid or the melt is charged with static electricity at least at any stage before or after the ejection. And a method of deflecting and distributing a liquid or a melt flowing out of a nozzle hole by a gas jet from the periphery thereof.