JP2023057618A - Coating nozzle - Google Patents

Abstract

To reduce variations in the discharge quantity of liquid in the longitudinal direction of a coating nozzle.SOLUTION: A coating nozzle includes: a block-shaped nozzle body extending in a longitudinal direction; an introduction port arranged in the nozzle body; and a discharge part arranged in the nozzle body and having a plurality of discharge ports arranged in the longitudinal direction. The nozzle body includes: a plurality of inflow passages 25 being continuous from the introduction port and arranged in the longitudinal direction; a first diffusion part 26 provided with a plurality of inflow openings 261 which are respectively connected to the plurality of inflow passages 25 and arrayed in the longitudinal direction; a plurality of outflow passages 27 which are arrayed in the longitudinal direction and into which liquid in the first diffusion part 26 flows out; and a second diffusion part which is filled with the liquid flowing from the plurality of outflow passages 27 and is connected to the discharge part. With respect to the longitudinal direction, connection positions of the plurality of outflow passages 27 relative to the first diffusion part 26 are different from positions of the plurality of inflow openings 261. This can reduce variations in the discharge quantity of liquid in the longitudinal direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to coating nozzles.

Conventionally, application nozzles have been used to apply various types of liquids. For example, in US Pat. No. 5,400,000, a nozzle for foamable melts is disclosed. The nozzle includes a plurality of foamable melt passages, a lateral distribution channel communicating with the plurality of foamable melt channels, a throttle member arranged in the lateral distribution channel, and a foamable melt for discharging the foamable melt. and a converging portion communicating between the lateral distribution channel and the slot and gradually decreasing in cross-sectional area toward the slot. The diaphragm member is a distribution plate provided with a large number of fine through holes, and the distribution plate divides the lateral distribution channels into the first lateral distribution channel and the second lateral distribution channel.

JP 2009-22867 A

By the way, in the nozzle structure of Patent Document 1, each foamable melt passage and a part of the through-hole of the distribution plate are arranged at the same position with respect to the longitudinal direction of the horizontal distribution channel. The liquid (melt) supplied from the through-holes easily passes through the part of the through-holes without diffusing in the lateral distribution channels. As a result, variations in the amount of liquid ejected tend to occur in the longitudinal direction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to reduce variations in the amount of liquid ejected in the longitudinal direction of a coating nozzle.

The invention according to claim 1 is a coating nozzle comprising a block-shaped nozzle body extending in a longitudinal direction, and an introduction port provided in the nozzle body for introducing a liquid supplied from the outside into the nozzle body. and a discharge portion provided in the nozzle body and having a plurality of discharge ports arranged in the longitudinal direction or having discharge ports extending in the longitudinal direction, wherein the nozzle body is continuous from the introduction port. A plurality of inflow passages arranged in the longitudinal direction and a plurality of inflow openings, which are spaces extending in the longitudinal direction and are respectively connected to the plurality of inflow passages, are arranged in the longitudinal direction. a first diffusion section filled with the liquid; a plurality of outflow channels arranged in the longitudinal direction and connected to the first diffusion section to allow the liquid in the first diffusion section to flow out; a second diffusing portion, which is a space extending in the longitudinal direction, is connected to the plurality of outflow channels, is filled with the liquid flowing in from the plurality of outflow channels, and is connected to the discharge portion; In terms of direction, the connecting positions of the plurality of outflow channels to the first diffusion portion are different from the positions of the plurality of inflow openings.

The invention according to claim 2 is the coating nozzle according to claim 1, wherein the connection position of each outflow channel with respect to the first diffusion part and the inflow opening closest to the connection position are the A longitudinal distance is greater than the width of the inlet opening in the longitudinal direction.

The invention according to claim 3 is the coating nozzle according to claim 1 or 2, wherein the first diffusion part and the second diffusion part are separated in a thickness direction perpendicular to the longitudinal direction, Each of the plurality of outflow channels has an outflow channel body extending in the thickness direction and having one end connected to the second diffusion portion, and the other end of the outflow channel body and the first diffusion portion. and a first nozzle block in which the nozzle body extends in the longitudinal direction and grooves forming the plurality of inflow passages and the first diffusion portion are provided on the side surface of the nozzle block. a second nozzle block extending in the longitudinal direction and provided with grooves on the side surfaces thereof for forming the plurality of outflow passage bodies and the second diffusion portion; It further comprises a shim plate disposed between the side surface and the side surface of the second nozzle block and provided with connecting holes for the plurality of outflow passages.

The invention according to claim 4 is the coating nozzle according to claim 3, wherein the discharge part includes a plurality of discharge channels extending in the thickness direction from the plurality of discharge ports arranged in the longitudinal direction. wherein the plurality of discharge flow paths are connected to the second diffusion section, and the sum of the areas of the regions where the plurality of discharge flow paths and the second diffusion section are connected is equal to It is smaller than the sum of the channel areas of the connecting holes.

The invention according to claim 5 is the coating nozzle according to claim 4, wherein the area of the region where each discharge flow path and the second diffusion portion are connected is equal to each of the discharge flow paths and the second diffusion part. smaller than the cross-sectional area of the second diffusion portion perpendicular to the longitudinal direction at the location where the second diffusion portion connects with the second diffusion portion.

The invention according to claim 6 is the coating nozzle according to any one of claims 1 to 5, wherein the discharge part has the plurality of discharge ports, and the opening area of the plurality of discharge ports is smaller than the opening area of the inlet.

The invention according to claim 7 is the coating nozzle according to any one of claims 1 to 6, wherein a discharge port of the discharge part is provided at a tip of the nozzle body in a thickness direction perpendicular to the longitudinal direction. is provided, and the coating nozzles are arranged on both sides of the nozzle body in the width direction perpendicular to the thickness direction and the longitudinal direction, and a pair of gas nozzles for ejecting a predetermined gas from the ejection port Further, the gas ejected from the pair of gas nozzles flows along the outer surface of the portion forming the edge of the ejection port and collides with the liquid ejected from the ejection port.

The invention according to claim 8 is the coating nozzle according to any one of claims 1 to 7, wherein the liquid has a viscosity of 1 to 200 mPa·s.

The invention according to claim 9 is the coating nozzle according to any one of claims 1 to 8, wherein two inflow openings adjacent to each other in the plurality of inflow openings are used as an inflow opening pair, and each inflow opening The number of outflow channels located between the pairs is constant.

According to the present invention, it is possible to reduce variations in the amount of liquid ejected in the longitudinal direction of the coating nozzle.

It is a sectional view showing a coating nozzle. It is a figure which shows the side surface of a 1st nozzle block. It is a figure which shows a shim board. It is a figure which shows the side surface of a 2nd nozzle block. It is a figure which shows the opposing surface of an auxiliary block. It is a figure which shows an auxiliary shim plate. It is a figure which shows the structure of a gas-liquid supply part. FIG. 10 is a side view of a first nozzle block in another example of coating nozzles; FIG. 10 is a side view of a first nozzle block in another example of coating nozzles;

FIG. 1 is a sectional view showing a coating nozzle 1 according to one embodiment of the invention. The application nozzle 1 ejects a predetermined liquid supplied from the outside to apply the liquid onto the object 9 . The liquid is, for example, a drug such as a deodorant, an adhesive, or the like. The object 9 is, for example, a sheet member such as nonwoven fabric or plastic film. The coating nozzle 1 is an assembly of a plurality of members, and these members are depicted separately from each other in FIG. 1 for easy understanding. In FIG. 1, arrows indicate the X, Y, and Z directions that are orthogonal to each other. In a typical usage example of the coating nozzle 1, the Z direction is the vertical direction, but of course the Z direction is not limited to the vertical direction.

A coating nozzle 1 includes a nozzle body 2 and a pair of gas nozzles 3 . The nozzle body 2 is a liquid nozzle that ejects liquid, and includes a first nozzle block 21 , a second nozzle block 22 and a shim plate 23 . Materials for forming the first nozzle block 21, the second nozzle block 22, and the shim plate 23 are not particularly limited, but are metals, for example. The first nozzle block 21 and the second nozzle block 22 are block-shaped members extending in the X direction in FIG. In the following description, the X direction in FIG. 1 is also referred to as "longitudinal direction". In the example of FIG. 1 , the object 9 is a long member parallel to the XY plane and continuous in the Y direction, and the longitudinal direction corresponds to the width of the object 9 .

The first nozzle block 21 and the second nozzle block 22 are arranged in the Y direction, and a shim plate 23 is arranged between them. Specifically, in the first nozzle block 21, the side surface 211 facing the shim plate 23 (the side surface facing the (-Y) direction in FIG. 1) is substantially a plane parallel to the ZX plane. In the second nozzle block 22, a side surface 221 facing the shim plate 23 (a side surface facing the (+Y) direction in FIG. 1) is substantially a plane parallel to the ZX plane. The shim plate 23 is a flat plate member parallel to the ZX plane. The dimensions of the shim plate 23 in the X and Z directions are substantially the same as those of the side surface 211 of the first nozzle block 21 and the side surface 221 of the second nozzle block 22 . Both main surfaces of the shim plate 23 contact the side surface 211 of the first nozzle block 21 and the side surface 221 of the second nozzle block 22, respectively. The first nozzle block 21, the shim plate 23 and the second nozzle block 22 are fixed to each other by bolts and nuts, for example. In the following description, the Y direction and Z direction in FIG. 1 are also referred to as "width direction" and "thickness direction", respectively.

FIG. 2 is a diagram showing a side surface 211 of the first nozzle block 21. As shown in FIG. A groove having a predetermined shape is formed in the side surface 211 of the first nozzle block 21 . As described above, the shim plate 23 is attached to the side surface 211 and the groove is covered with the shim plate 23 . Therefore, in the nozzle body 2 , the grooves and the shim plate 23 form a plurality of liquid flow paths. In the following description, the portion of the groove in FIG. 2, which is part of each channel, will be referred to by the same name as the channel. The same applies to the later-described groove portions formed in the side surface 221 of the second nozzle block 22 .

As shown in FIG. 2 , the first nozzle block 21 includes a first introduction channel 241 , a second introduction channel 242 , multiple inflow channels 25 , and a first diffusion section 26 . The first introduction channel 241 extends in the Y direction at substantially the center of the first nozzle block 21 in the X direction, and has a constant cross-sectional area over its entire length, for example. The first introduction channel 241 passes through the first nozzle block 21 and opens at the (+Y) side surface 212 (see FIG. 1) and the (−Y) side surface 211 of the first nozzle block 21 . An opening of the first introduction channel 241 in the surface 212 is the introduction port 24 . The inlet 24 introduces the liquid supplied from the outside into the nozzle body 2 . In this embodiment, a predetermined liquid is supplied to the introduction port 24 from a gas-liquid supply unit 6 (see FIG. 7), which will be described later. Although the coating nozzle 1 is typically provided with only one inlet 24 , a plurality of inlets 24 may be provided depending on the design of the nozzle body 2 .

The second introduction channel 242, the plurality of inflow channels 25, and the first diffusion portion 26 are formed by grooves and the shim plate 23 provided on the side surface 211 of FIG. The groove depth (depth in the Y direction) may be the same or different in the second introduction channel 242 , the plurality of inflow channels 25 , and the first diffusion portion 26 . The second introduction channel 242 includes a first portion 243 extending on both sides in the X direction from the opening of the first introduction channel 241 in the side surface 211, and second portions 243 extending in the (−Z) direction from each end of the first portion 243. A portion 244 and a third portion 245 extending from the tip of the second portion 244 to both sides in the X direction.

The plurality of inflow channels 25 each extend in the Z direction and are arranged in the X direction. The plurality of inflow channels 25 are substantially parallel to each other and have substantially the same width in the X direction. The (+Z) side end of each inflow channel 25 is connected to the end of the third portion 245 of the second introduction channel 242 . In the nozzle body 2 , a so-called tournament-like channel is formed by the second introduction channel 242 and the plurality of inflow channels 25 . In the example of FIG. 2, the second introduction channel 242 and the plurality of inflow channels 25 have a symmetrical shape with respect to the plane perpendicular to the X direction at the position of the first introduction channel 241 (the first diffusion portion 26 as well). The number of inflow channels 25 is, for example, an even number of 2 or more, preferably 4 or more. The number of inflow channels 25 may be an odd number. The number of inflow channels 25 is, for example, 16 or less. The plurality of flow paths from the opening of the first introduction flow path 241 to the (−Z) side ends of the plurality of inflow flow paths 25 (inflow openings 261 to be described later) have substantially the same resistance. The flow rate of the supplied liquid in the plurality of inflow channels 25 is substantially the same.

The first diffusion portion 26 is a space extending in the X direction. In the example of FIG. 2, the width of the first diffusion portion 26 in the Z direction is greater than the width of each inflow channel 25 in the X direction. A plurality of inflow openings 261 are arranged in the X direction in the first diffusion part 26 . The plurality of inflow openings 261 are connected to the plurality of inflow channels 25 respectively. In other words, the plurality of inflow openings 261 are the openings of the plurality of inflow channels 25 on the first diffusion portion 26 side. Liquid flowing through the plurality of inflow channels 25 flows into the first diffusion section 26 through the plurality of inflow openings 261 . As a result, the first diffusion portion 26 is filled with the liquid.

FIG. 3 is a diagram showing the shim plate 23. As shown in FIG. The shim plate 23 has a plurality of connecting holes 271 and a discharge portion 29 . The discharge portion 29 is provided at the end of the shim plate 23 on the (-Z) side, and the plurality of connection holes 271 are provided away from the discharge portion 29 in the (+Z) direction. Details of the ejection portion 29 will be described later. Each of the plurality of connecting holes 271 is a through hole and arranged at a constant pitch in the X direction. The plurality of connecting holes 271 have approximately the same diameter. The diameter of each connecting hole portion 271 is, for example, smaller than the width in the X direction of the inflow opening 261 (see FIG. 2). In FIGS. 2 and 3, the connecting hole portion 271 is depicted larger than it actually is (the same applies to other drawings).

As indicated by the two-dot chain line in FIG. 2, the plurality of connecting holes 271 overlap the first diffusion portion 26 when viewed along the Y direction. The liquid in the first diffusion portion 26 can flow out from the plurality of connecting holes 271 . Actually, since the channel area of the connecting hole portion 271 (that is, the cross-sectional area perpendicular to the direction in which the liquid flows, here, the area of the connecting hole portion 271 as seen along the Y direction) is small, the first The amount of liquid flowing out from the diffusion portion 26 through the connecting hole portion 271 is restricted. The number of connecting holes 271 is, for example, greater than the number of inflow channels 25 , preferably twice or more than the number of inflow channels 25 . The number of connecting holes 271 is, for example, four times or less the number of inflow channels 25 . Each connecting hole portion 271 is one end of an outflow channel 27 which will be described later.

Here, the positional relationship between the inflow channel 25 and the connecting hole portion 271 in the first diffusion portion 26 will be described with reference to FIG. In the nozzle body 2, none of the connecting holes 271 exist on the extension line of each inflow channel 25, and the range of existence of each connecting hole 271 overlaps the range of existence of any of the inflow openings 261 with respect to the X direction. not. In this manner, the positions of the plurality of connecting holes 271 (that is, the connection positions of the outflow flow paths 27) in the X direction are different from the positions of the plurality of inflow openings 261. As shown in FIG. For example, the distance in the X direction (center-to-center distance) between the position of each connecting hole 271 and the position of the inflow opening 261 closest thereto is greater than the width of the inflow opening 261 in the X direction. The distance is preferably 1.2 mm or more, more preferably 4.8 mm or more. The positions of the plurality of connecting holes 271 in the X direction are different from (preferably separated from) the positions of the plurality of inflow openings 261, so that the liquid flowing into the first diffusion portion 26 from the plurality of inflow channels 25 does not immediately flow out of the connecting hole portion 271, but collides with the inner surface of the first diffusion portion 26 and spreads in the X direction. As a result, the liquid can be appropriately diffused in the X direction within the first diffusion portion 26 before flowing out from the connecting hole portion 271 .

The inflow direction of the liquid from the inflow opening 261 to the first diffusing portion 26 is approximately the (−Z) direction, and the outflow direction of the liquid from the first diffusing portion 26 to the connecting hole portion 271 (see FIG. 1) is approximately (−Y) direction. In this manner, the inflow direction of the liquid into the first diffusing section 26 and the outflow direction of the liquid from the first diffusing section 26 are substantially perpendicular to each other. It can be diffused.

FIG. 4 is a diagram showing a side surface 221 of the second nozzle block 22. As shown in FIG. A groove having a shape different from that of the side surface 211 of the first nozzle block 21 is formed in the side surface 221 of the second nozzle block 22 . The second nozzle block 22 includes a plurality of outflow channel bodies 272 and a second diffusion portion 28 . A plurality of outflow channel main bodies 272 and second diffusion portions 28 are formed by grooves provided on the side surface 221 and the shim plate 23 . The groove depths (depths in the Y direction) may be the same or different in the plurality of outflow channel main bodies 272 and the second diffusion portions 28 . The plurality of outflow channel bodies 272 each extend in the Z direction and are arranged in the X direction. The plurality of outflow channel main bodies 272 are substantially parallel to each other and have substantially the same width in the X direction. When viewed along the Y direction, the (+Z) side ends of the plurality of outflow channel main bodies 272 overlap with the plurality of connecting holes 271 (indicated by chain double-dashed lines in FIG. 4).

The second diffusion portion 28 is a space extending in the X direction. The width of the second diffusion portion 28 in the Z direction may be the same as or different from that of the first diffusion portion 26 . The (−Z) side ends of the plurality of outflow channel main bodies 272 are connected to the second diffusion portion 28 . The liquid flowing out from the first diffusing portion 26 through the plurality of connecting holes 271 passes through the plurality of outflow channel main bodies 272 and flows into the second diffusing portion 28 . As a result, the second diffusion portion 28 is filled with the liquid.

Here, when the combination of the connecting hole portion 271 and the outflow channel main body 272 that are connected to each other is called "outflow channel 27", in the nozzle body 2, the plurality of outflow channels 27 are arranged in the X direction. Both ends of the plurality of outflow channels 27 are connected to a first diffusion portion 26 and a second diffusion portion 28 separated in the Z direction. The plurality of outflow channels 27 cause the liquid in the first diffusion section 26 to flow out and into the second diffusion section 28 . The plurality of outflow flow paths 27 have substantially the same flow path resistance, and the plurality of outflow flow paths 27 have substantially the same liquid flow rate.

A plurality of slit holes extending in the Z direction are formed at regular intervals in the X direction in the shim plate 23 of FIG. In other words, the ejection portion 29 is provided with a comb-like portion. As described above, the first nozzle block 21 and the second nozzle block 22 are attached to both main surfaces of the shim plate 23, and the side surface 211 of the first nozzle block 21 and the side surface 221 of the second nozzle block 22 Both sides of the slit hole in the Y direction are covered. Thereby, a plurality of discharge flow paths 291 each extending in the Z direction are formed. In the following description, the slit holes in FIG. In FIG. 3, the width of the discharge flow paths 291 in the X direction is drawn larger than the actual width, and the number of the discharge flow paths 291 is drawn smaller than the actual number.

As indicated by the two-dot chain line in FIG. 3 , the second diffusing portion 28 overlaps the (+Z) side ends of the plurality of discharge flow paths 291 when viewed along the Y direction. That is, the plurality of discharge channels 291 are connected to the second diffusion section 28 . The other end (the end on the (-Z) side) of the plurality of discharge channels 291 is a discharge port 290 that opens outward. At the (-Z) end of the nozzle body 2, a plurality of ejection openings 290 are arranged at a constant pitch in the X direction. The liquid filled in the second diffusion portion 28 is discharged in the (−Z) direction from a plurality of discharge ports 290 via a plurality of discharge flow paths 291 . In the example of FIG. 1, the liquid is ejected onto the object 9 continuously moving in the Y direction. In the nozzle body 2, it is also possible to consider that each discharge flow path 291 extends from the discharge port 290 in the Z direction. Typically, the number of discharge ports 290 (discharge flow paths 291 ) is sufficiently larger than the number of outflow flow paths 27 .

As shown in FIG. 1, a pair of gas nozzles 3 are arranged on both sides of the nozzle body 2 in the Y direction, and eject a predetermined gas (for example, air). Each of the (+Y) side gas nozzle 3 and the (−Y) side gas nozzle 3 includes an auxiliary block 31 and an auxiliary shim plate 32 . The material forming the auxiliary block 31 and the auxiliary shim plate 32 is not particularly limited, but is metal, for example. The auxiliary block 31 is a block-shaped member extending in the X direction in FIG.

As described above, in each of the first nozzle block 21 and the second nozzle block 22, edges of a plurality of ejection ports 290 are formed at the (−Z) side ends 211a and 221a of the side surfaces 211 and 221, respectively. The end portions 211a and 221a are the most (-Z) side portions of the coating nozzle 1, that is, the lowest portion in FIG. The first nozzle block 21 is provided with an inclined surface 213 that is inclined toward the (+Z) side from the end portion 211a toward the (+Y) side. In the (+Y) side gas nozzle 3 , the auxiliary block 31 has a facing surface 311 substantially parallel to the inclined surface 213 . The auxiliary block 31 is attached to the first nozzle block 21 with bolts or the like with the auxiliary shim plate 32 sandwiched between the facing surface 311 and the inclined surface 213 .

Similarly to the above, the second nozzle block 22 is provided with an inclined surface 223 that inclines toward the (+Z) side from the end 221a toward the (−Y) side. In the (−Y) side gas nozzle 3 , the auxiliary block 31 has a facing surface 311 substantially parallel to the inclined surface 223 . The auxiliary block 31 is attached to the second nozzle block 22 with bolts or the like with the auxiliary shim plate 32 sandwiched between the facing surface 311 and the inclined surface 223 .

FIG. 5 is a view showing the facing surface 311 of the auxiliary block 31 in the gas nozzle 3 on the (+Y) side, and shows a state seen from a direction perpendicular to the facing surface 311. As shown in FIG. FIG. 6 is a diagram showing the auxiliary shim plate 32 in the gas nozzle 3 on the (+Y) side, showing a state seen from a direction perpendicular to the auxiliary shim plate 32 . When attached to the nozzle body 2, the facing surface 311 of the auxiliary block 31 and the auxiliary shim plate 32 are inclined with respect to the ZX plane. The upper portion in FIGS. 5 and 6 is the portion located on the (+Z) side of the coating nozzle 1 in FIG. The structure of the (+Y) side gas nozzle 3 will be described below with reference to FIGS. 5 and 6, but the structure of the (−Y) side gas nozzle 3 is the same.

As shown in FIG. 5, a gas supply groove 312 extending in the X direction is formed in the facing surface 311 of the auxiliary block 31 . As shown in FIG. 1 , a gas introduction channel 313 extending in the X direction is provided inside the auxiliary block 31 , and the gas supply groove 312 is connected to the gas introduction channel 313 . The lower portion of the auxiliary shim plate 32 in FIG. 6 is notched except for both ends in the X direction. That is, a concave portion 321 that is recessed upward is formed in the lower portion of the auxiliary shim plate 32 .

As described above, the auxiliary shim plate 32 is sandwiched between the inclined surface 213 of the first nozzle block 21 and the opposing surface 311 of the auxiliary block 31, and both sides of the recess 321 in the direction perpendicular to the auxiliary shim plate 32 is covered. Therefore, in the gas nozzle 3 of FIG. 1, the gas introduced into the gas introduction passage 313 from the gas-liquid supply unit 6 described later is supplied into the recess 321 through the gas supply groove 312, and the (-Z) of the recess 321 is supplied. It is ejected from the ejection port 322 which is an opening on the side. In the coating nozzle 1, the ejection port 322 extends in the X direction so as to include the range from the ejection port 290 closest to the (+X) side to the ejection port 290 closest to the (−X) side. Since the thickness of the auxiliary shim plate 32 is greater than the thickness of the shim plate 23 of the nozzle body 2, the width of the ejection port 322 in the direction perpendicular to the X direction is greater than the width of the ejection port 290 in the Y direction.

In the example of FIG. 1 , the ejection port 322 of the gas nozzle 3 on the (+Y) side is located on the (+Z) side of the (−Z) side end 211 a of the side surface 211 of the first nozzle block 21 . The gas ejected from the ejection port 322 flows along the inclined surface 213 toward the end portion 211 a and collides with the liquid ejected from the plurality of ejection ports 290 . The ejection port 322 of the (−Y) side gas nozzle 3 is located on the (+Z) side of the (−Z) side end 221 a of the side surface 221 of the second nozzle block 22 . The gas ejected from the ejection port 322 flows along the inclined surface 213 toward the end portion 221 a and collides with the liquid ejected from the plurality of ejection ports 290 . Thus, the gas collides with the liquid ejected from the plurality of ejection ports 290 from both sides in the Y direction.

FIG. 7 is a diagram showing the configuration of the gas-liquid supply unit 6. As shown in FIG. In the gas-liquid supply unit 6 , compressed air is supplied from a compressed air supply source 61 into the liquid tank 63 via a pressure reducing valve 62 . In this embodiment, the liquid tank 63 stores a low-viscosity liquid. The viscosity of the liquid is, for example, 1 to 200 mPa·s, preferably 1 to 50 mPa·s. One end of a liquid supply line 64 is connected to the liquid tank 63 , and the liquid is pumped to the liquid supply line 64 by supplying compressed air into the liquid tank 63 . The liquid supply line 64 is provided with an air operated valve 641 using compressed air and a flow control valve 642 . The other end of the liquid supply line 64 is connected to the introduction port 24 (see FIG. 1) of the coating nozzle 1 .

When the liquid is discharged from the application nozzle 1 , the air operated valve 641 is opened and the liquid pressure-fed to the liquid supply line 64 is supplied to the inlet 24 . At this time, the supply flow rate of the liquid to the coating nozzle 1 is adjusted by the flow rate adjustment valve 642 . The liquid flows through the first inlet channel 241, the second inlet channel 242, the plurality of inlet channels 25, the first diffusion section 26, the plurality of outlet channels 27, and the second diffusion channel 241 of the coating nozzle 1 of FIG. It passes through the portions 28 in order and is discharged from the plurality of discharge ports 290 of the discharge portion 29 . When stopping liquid ejection, the air operated valve 641 is closed.

The gas-liquid supply unit 6 of FIG. 7 is provided with a gas supply line 67 having one end connected to a gas supply source 66 (which may be the compressed air supply source 61). The other end of the gas supply line 67 is branched into a plurality of branch lines and connected to the gas introduction passages 313 of the pair of gas nozzles 3 shown in FIG. Gas supplied from the gas supply source 66 to the gas supply line 67 is guided into the recess 321 through the gas introduction passage 313 and the gas supply groove 312 and ejected from the ejection port 322 . The coating nozzle 1 and the gas-liquid supply unit 6 are used as a coating device to apply the liquid to the object 9 .

A liquid ejection test was conducted with the thickness of the shim plate 23 of the coating nozzle 1 set to 0.02 to 0.05 mm, the thickness of the auxiliary shim plate 32 set to 0.1 mm, and the ejection amount of 10 to 40 g/min. At this time, the liquid viscosity was set to 1 mPa·s, the liquid introduction pressure was set to 0.034 MPa, and the gas supply pressure was set to 0.1 MPa. In the ejection test, the state of adhesion of the liquid to the target object 9 was improved, and scattering to the surroundings was appropriately suppressed.

As described above, the coating nozzle 1 includes a block-shaped nozzle body 2 extending in the longitudinal direction (the X direction in the above description), an inlet 24 provided in the nozzle body 2, and an inlet 24 provided in the nozzle body 2. and an ejection portion 29 having a plurality of ejection ports 290 arranged in a direction. The nozzle body 2 is provided with a plurality of inflow passages 25 continuous from the inlet 24 and arranged in the longitudinal direction, and a plurality of inflow openings 261 respectively connected to the plurality of inflow passages 25 arranged in the longitudinal direction. a plurality of outflow channels 27 that are arranged in the longitudinal direction and that allow the liquid in the first diffusion part 26 to flow out; and a second diffusion portion 28 connected to the discharge portion 29 . With respect to the longitudinal direction, the connection positions of the plurality of outflow channels 27 to the first diffusion portion 26 are different from the positions of the plurality of inflow openings 261 . As a result, the liquid flowing in from the plurality of inflow openings 261 can be appropriately diffused in the first diffusing portion 26, and the variation in the discharge amount of the liquid in the longitudinal direction (in the above example, the discharge from the plurality of discharge openings 290 can be reduced). variation in the amount of liquid ejected) can be reduced.

Preferably, the longitudinal distance between the connection position of each outflow channel 27 to the first diffusion part 26 and the inflow opening 261 closest to the connection position is greater than the width of the inflow opening 261 in the longitudinal direction. . Thereby, the liquid flowing in from the plurality of inflow openings 261 can be more reliably diffused in the first diffusion section 26 .

Preferably, the first diffusion portion 26 and the second diffusion portion 28 are separated in the thickness direction perpendicular to the longitudinal direction. Each of the plurality of outflow channels 27 includes an outflow channel main body 272 extending in the thickness direction and having one end connected to the second diffusion portion 28, and the other end of the outflow channel main body 272 and the first diffusion and a connecting hole portion 271 that connects with the portion 26 . As a result, the flow rate of liquid flowing through each outflow channel 27 can be appropriately restricted, and an increase in the flow rate of liquid in some of the outflow channels 27 can be more reliably suppressed. As a result, it is possible to more reliably reduce variations in the amount of liquid ejected in the longitudinal direction.

Preferably, the nozzle body 2 comprises a first nozzle block 21 , a second nozzle block 22 and a shim plate 23 . A side surface 211 of the first nozzle block 21 is provided with grooves that form a plurality of inflow channels 25 and first diffusion portions 26 . The side surface 221 of the second nozzle block 22 is provided with grooves forming the outflow channel bodies 272 of the plurality of outflow channels 27 and the second diffusion portion 28 . The shim plate 23 is arranged between the side surface 211 of the first nozzle block 21 and the side surface 221 of the second nozzle block 22 , and is provided with connecting holes 271 for the plurality of outflow flow paths 27 . Thereby, the coating nozzle 1 can be manufactured easily.

Preferably, the ejection port 290 of the ejection portion 29 is provided at the tip of the nozzle body 2 in the thickness direction perpendicular to the longitudinal direction. Further, the coating nozzle 1 is arranged on both sides of the nozzle body 2 in the width direction perpendicular to the thickness direction and the longitudinal direction, and further includes a pair of gas nozzles 3 for ejecting a predetermined gas from the ejection port 322 . The gas ejected from the pair of gas nozzles 3 flows along the outer surface of the portion forming the edge of the ejection port 290 and collides with the liquid ejected from the ejection port 290 . As a result, the liquid adhering (accumulating) at the tip of the nozzle body 2 can be properly peeled off by the surface tension, and the spread of the liquid discharged from the discharge port 290 in the width direction can be suppressed. Note that the gas ejected from the pair of gas nozzles 3 may not collide with the liquid ejected from the ejection port 290 depending on the design of the coating nozzle 1 .

Next, a preferable relationship between the areas of the flow passages at each position of the coating nozzle 1 will be described. First, the area of the liquid outlet in the coating nozzle 1 is preferably smaller than the area of the liquid inlet. 1 and 3, the opening area of each ejection port 290 is the distance in the Y direction between the side surface 211 of the first nozzle block 21 and the side surface 221 of the second nozzle block 22 (that is, the distance of the shim plate 23). thickness) and the width of the discharge channel 291 in the X direction. Also, the opening area of the introduction port 24 is the cross-sectional area of the first introduction channel 241 perpendicular to the Y direction.

In the coating nozzle 1, since the sum of the opening areas of the plurality of discharge ports 290 is smaller than the opening area of the introduction port 24, the nozzle body 2 can be appropriately filled with the liquid, and the pressure of the liquid can be stabilized. It is possible to more reliably reduce variations in the amount of liquid ejected from the plurality of ejection ports 290 . The ratio of the sum of the opening areas of the plurality of discharge ports 290 to the opening area of the introduction port 24 is, for example, 2 to 10%, preferably 5 to 7%. In the coating nozzle 1, by reducing the thickness of the shim plate 23, the opening area of the ejection port 290 can be easily reduced.

In addition, the area of the region where each discharge channel 291 and the second diffusion portion 28 are connected is equal to the area of the second diffusion portion 28 perpendicular to the longitudinal direction at the position where the discharge channel 291 and the second diffusion portion 28 are connected. It is preferably smaller than the cross-sectional area. As a result, the liquid can be appropriately diffused in the longitudinal direction in the second diffusing portion 28, the pressure of the liquid can be stabilized, and variations in the amount of liquid ejected from the plurality of ejection ports 290 can be more reliably reduced. can do. In the example of FIG. 3, the area of the region where each discharge channel 291 and the second diffusion portion 28 are connected is the area where the second diffusion portion 28 and the discharge channel 291 overlap when viewed along the Y direction. , which is the product of the width of the second diffusion portion 28 in the Z direction and the width of the discharge flow path 291 in the X direction.

Furthermore, the sum of the areas where the plurality of discharge channels 291 and the second diffusion portion 28 are connected is preferably smaller than the sum of the channel areas of the connecting holes 271 in the plurality of outflow channels 27 . As a result, the second diffusion portion 28 can be appropriately filled with the liquid, the pressure of the liquid can be stabilized, and variations in the amount of liquid ejected from the plurality of ejection ports 290 can be more reliably reduced. can be done.

Note that the sum of the channel areas of the connecting holes 271 in the plurality of outflow channels 27 may be larger or smaller than the opening area of the inlet 24 , but the liquid can be properly supplied to the first diffusion part 26 . In order to stabilize the pressure of the liquid on the upstream side from the first diffusing portion 26 , the sum of the channel areas of the connecting holes 271 is preferably smaller than the opening area of the inlet 24 . The above relationship regarding the area of the flow path is satisfied in a preferred form of the coating nozzle 1, and depending on the application of the coating nozzle 1, the type of liquid to be used, etc., the above relationship may not be satisfied.

FIG. 8 is a diagram showing a side surface 211 of the first nozzle block 21 in another example of the coating nozzle 1. FIG. In the first nozzle block 21 of FIG. 8, a plurality of inflow openings 261 (and a plurality of inflow channels 25) are arranged at regular intervals in the X direction. That is, two inflow openings 261 adjacent to each other in the plurality of inflow openings 261 are defined as an inflow opening pair, and the distance between the two inflow openings 261 is equal in the plurality of inflow opening pairs. In addition, the number of connecting holes 271 positioned between the two inflow openings 261 in the X direction is the same for the plurality of inflow opening pairs. Since the number of outflow channels 27 positioned between each pair of inflow openings is constant in this manner, the coating nozzle 1 having the first nozzle block 21 in FIG. Variation in ejection amount can be further reduced. Further, in the example of FIG. 8 , the longitudinal distance between each connecting hole 271 and the inflow opening 261 closest to the connecting hole 271 is constant in the plurality of connecting holes 271 . As a result, variations in the amount of liquid ejected in the longitudinal direction can be further reduced.

Various modifications are possible for the coating nozzle 1 described above.

In the above embodiment, the first nozzle block 21 is provided with the first diffusion portion 26, and the second nozzle block 22 is provided with the second diffusion portion 28. For example, as shown in FIG. 21 may be provided with a first diffusion portion 26 and a second diffusion portion 28 . In the example of FIG. 9, a plurality of outflow channels 27 each extending in the thickness direction (Z direction) are arranged in the longitudinal direction (X direction) between the first diffusion portion 26 and the second diffusion portion 28. . In FIG. 9, a plurality of discharge flow paths 291 provided in the shim plate 23 are indicated by two-dot chain lines. Also in the coating nozzle 1 having the first nozzle block 21 of FIG. It is possible to reduce variations in the amount of liquid ejected in the longitudinal direction.

The nozzle body 2 does not necessarily have to be composed of the first nozzle block 21 , the second nozzle block 22 and the shim plate 23 . For example, in the coating nozzle 1 having the first nozzle block 21 of FIG. may be omitted.

The discharge part 29 may have one discharge port extending in the longitudinal direction. Even in this case, in the application nozzle 1 in which the connection positions of the plurality of outflow channels 27 to the first diffusion portion 26 are different from the positions of the plurality of inflow openings 261 in the longitudinal direction, variations in the discharge amount of the liquid in the longitudinal direction can be reduced. can be reduced.

The liquid ejected from the coating nozzle 1 is not limited to low-viscosity liquid, and relatively high-viscosity liquid may be ejected. On the other hand, in the coating nozzle 1, if the connection position of the outflow channel with respect to the first diffusion part in the longitudinal direction is the same as the position of the inflow opening, a low-viscosity liquid with a viscosity of 1 to 200 mPa·s will Immediately after flowing into the 1 diffusion part, it becomes easy to flow out of the outflow channel. That is, the low-viscosity liquid is difficult to diffuse in the first diffusion portion, and the discharge amount of the liquid tends to vary significantly in the longitudinal direction. Therefore, it can be said that the coating nozzle 1 is particularly suitable for ejecting a liquid having a viscosity of 1 to 200 mPa·s, such as a liquid containing a large amount of water.

By providing a pair of gas nozzles 3 in the coating nozzle 1, it is possible to eject the liquid by a curtain spray method, but depending on the design of the coating nozzle 1, only one gas nozzle 3 may be provided. . Moreover, the gas nozzle 3 may be omitted and the liquid may be discharged by a coater method.

A heater may be provided in the coating nozzle 1 depending on the type of liquid to be discharged. Furthermore, a heater may be provided in the gas supply line 67 . For example, in the first nozzle block 21 of FIG. 1, a hole extending in the longitudinal direction (X direction) is formed between the side surface 211 and the inclined surface 213, and a rod-shaped heater is provided in the hole. Of course, a heater may be provided in the second nozzle block 22 instead of the heater in the first nozzle block 21 or together with the heater in the first nozzle block 21 .

The object 9 onto which the liquid is applied by the application nozzle 1 may be various members other than the sheet member.

The configurations in the above embodiment and each modified example may be combined as appropriate as long as they do not contradict each other.

1 coating nozzle 2 nozzle main body 3 gas nozzle 21 first nozzle block 22 second nozzle block 23 shim plate 24 inlet 25 inflow channel 26 first diffusion part 27 outflow channel 28 second diffusion part 29 discharge part 211, 221 (nozzle Sides 213, 223 of block 213, 223 Inclined surface (of nozzle block) 261 Inflow opening 271 Connection hole 272 Outflow channel body 290 Discharge port 291 Discharge channel 322 Jet port

Claims (9)

A coating nozzle,
a longitudinally extending block-shaped nozzle body;
an introduction port provided in the nozzle body for introducing a liquid supplied from the outside into the nozzle body;
a discharge portion provided in the nozzle body and having a plurality of discharge ports arranged in the longitudinal direction or having discharge ports extending in the longitudinal direction;
with
The nozzle body is
a plurality of inflow channels continuous from the inlet and arranged in the longitudinal direction;
a first diffusing portion, which is a space extending in the longitudinal direction, is provided with a plurality of inflow openings arranged in the longitudinal direction and connected to the plurality of inflow channels, and is filled with the liquid;
a plurality of outflow channels arranged in the longitudinal direction and connected to the first diffusion section to allow the liquid in the first diffusion section to flow out;
a second diffusion portion, which is a space extending in the longitudinal direction, is connected to the plurality of outflow channels, is filled with the liquid flowing in from the plurality of outflow channels, and is connected to the discharge portion;
with
A coating nozzle, wherein a connection position of the plurality of outflow channels with respect to the first diffusion portion is different from a position of the plurality of inflow openings with respect to the longitudinal direction. The coating nozzle according to claim 1,
The longitudinal distance between the connection position of each outflow channel with respect to the first diffusion part and the inflow opening closest to the connection position is greater than the width of the inflow opening in the longitudinal direction. and a coating nozzle. The coating nozzle according to claim 1 or 2,
the first diffusion portion and the second diffusion portion are separated in a thickness direction perpendicular to the longitudinal direction;
each of the plurality of outflow channels,
an outflow channel body extending in the thickness direction and having one end connected to the second diffusion portion;
a connecting hole portion connecting the other end portion of the outflow channel body and the first diffusion portion;
with
The nozzle body is
a first nozzle block extending in the longitudinal direction and having a side surface provided with grooves forming the plurality of inflow channels and the first diffusion section;
a second nozzle block extending in the longitudinal direction and having a side surface provided with an outflow channel main body of the plurality of outflow channels and a groove forming the second diffusion portion;
a shim plate disposed between the side surface of the first nozzle block and the side surface of the second nozzle block and provided with connecting holes for the plurality of outflow flow paths;
A coating nozzle, further comprising: The coating nozzle according to claim 3,
the ejection portion has a plurality of ejection passages extending in the thickness direction from the plurality of ejection ports arranged in the longitudinal direction;
the plurality of discharge channels are connected to the second diffusion section;
A coating nozzle according to claim 1, wherein the sum of areas where said plurality of discharge flow paths and said second diffusion section are connected is smaller than the sum of flow path areas of connecting holes in said plurality of outflow flow paths. The coating nozzle according to claim 4,
The area of the region where each discharge flow path and the second diffusion section are connected is the cross-sectional area of the second diffusion section perpendicular to the longitudinal direction at the position where each discharge flow path and the second diffusion section are connected. A coating nozzle characterized by being smaller than. The coating nozzle according to any one of claims 1 to 5,
the ejection section has the plurality of ejection ports,
A coating nozzle, wherein the sum of the opening areas of the plurality of ejection ports is smaller than the opening area of the introduction port. The coating nozzle according to any one of claims 1 to 6,
A discharge port of the discharge unit is provided at a tip of the nozzle body in a thickness direction perpendicular to the longitudinal direction,
The coating nozzle is
further comprising a pair of gas nozzles arranged on both sides of the nozzle body in the width direction perpendicular to the thickness direction and the longitudinal direction and ejecting a predetermined gas from ejection ports;
A coating nozzle, wherein the gas ejected from the pair of gas nozzles flows along the outer surface of a portion forming the edge of the ejection port and collides with the liquid ejected from the ejection port. The coating nozzle according to any one of claims 1 to 7,
The coating nozzle, wherein the liquid has a viscosity of 1 to 200 mPa·s. The coating nozzle according to any one of claims 1 to 8,
A coating nozzle, wherein two adjacent inflow openings among the plurality of inflow openings are defined as inflow opening pairs, and the number of outflow flow paths positioned between each inflow opening pair is constant.

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