JP3989930B2 - Electrostatic blade type coating nozzle for high viscosity - Google Patents

Description

  The present invention relates to a high-viscosity electrostatic blade-type coating nozzle, and in particular, high-viscosity liquid chocolate or creamy on the surface of foods such as biscuits, cakes and rice crackers, industrial members, and other coated bodies. High-viscosity electrostatic fluid for spraying uniformly onto the surface of the coated body under the action of static electricity, high-viscosity liquid made of other materials, industrial high-viscosity oil, and other materials The present invention relates to a blade type coating nozzle.

  Referring to FIG. 5, conventionally, the electrostatic liquid coating apparatus 101 is provided with an electrostatic blade type coating nozzle 103 (hereinafter simply referred to as “nozzle”). The liquid is sprayed from the nozzle 103 toward the object 105 under the action of static electricity and applied to the surface of the object 105.

  The electrostatic liquid coating apparatus 101 communicates with a nozzle 103 having a liquid ejection channel group 107 to be ejected toward an object to be coated 105 and to supply the liquid corresponding to the ejection channel group 107. A liquid supply circuit 109 for coating and a solenoid valve 111 interposed in the liquid supply line 109 for opening and closing the liquid supply line 109 constitute a coating hydraulic circuit.

  Further, the coating hydraulic circuit is configured such that the liquid is supplied from the liquid tank 117 to the liquid supply line 109 by the liquid pump 115 driven to rotate by the liquid motor 113.

  The nozzle 103 includes a nozzle head 127 in which one or many shims 125 are arranged as electrodes in a slit 123 formed between a pair of nozzle blades 119 and 121. The nozzle blades 119 and 121 are made of an electrically insulating material, and are, for example, longer than the coated body 105. The shim 125 is made of a conductive material made of a stainless steel sheet having a thickness of about 0.5 mm, for example, and the length of one shim 125 is 100 to 150 mm as shown in FIG. That's right. Therefore, when the total length of the nozzle blades 119 and 121 is long, a large number of shims 125 are arranged in the horizontal direction and arranged so that the total length is the same as the total length of the nozzle blades 119 and 121.

  Further, between the surface of the shim 125 and the adjacent surface of one of the nozzle blades 119, a discharge channel group 107 of liquid to be discharged toward the object 105 is formed. For example, the discharge flow path group 107 is etched at a groove depth C on one side of the shim 125. Note that a liquid supply port 129 for supplying liquid is communicated with the discharge flow path group 107.

  6A and 6B together, for example, as the shim 125, the oil reservoirs 131A and 131B and the discharge flow path groups 107A and 107B are, for example, 0 on the left surface in FIG. Etching is performed at a depth C of about 25 mm, and a liquid supply port 129 for supplying liquid to the oil sumps 131A and 131B connected to the discharge flow path groups 107A and 107B is communicated.

  The oil sumps 131A and 131B communicate with a pair of liquid supply ports 129 in the nozzle blade 119 of the coating apparatus, and these liquid supply ports 129 are connected via a variable flow control valve 133 and an electromagnetic valve 111 as shown in FIG. Then, it is connected to the liquid pump 115 via the liquid supply line 109.

  The discharge flow channel groups 107A and 107B act as capillary resistances, the resistance value is proportional to the length of the flow channel, and the flow rate is inversely proportional to the square of the length. The application widths of the fluid discharged from the discharge flow path groups 107A and 107B are WA and WB, respectively. Therefore, by opening / closing the solenoid valve 111 on the upstream side of each of the discharge flow path groups 107A and 107B, the entire application width of the shim 125 can be changed to WA, WB, and WA + WB according to the object to be applied 105. Is possible.

  The relatively large circular openings 135 formed on both sides of the sumps 131A and 131B in the shim 125 are for passing fixing bolts to the support bracket and the like of the entire coating apparatus. In addition, a relatively small circular opening 137 disposed in the adjacent area of the sumps 131A, 131B is a stop for assembling the apparatus while maintaining liquid tightness between the shim 125 and the adjacent nozzle blades 119, 121. A screw is passed through. In addition, the discharge port 139 of the final flow path of the discharge flow path groups 107A and 107B formed as described above has a rectangular shape.

  Referring to FIG. 5 again, the object 105 is grounded and has a positive potential. Therefore, when a negative high-voltage DC high voltage (around −60 to −70 kV) is applied to the shim 125 via the power connector 141, the liquid supplied from the liquid supply port 129 flows through the discharge flow path groups 107A and 107B. Since they are charged instantaneously while passing, charges of the same polarity repel each other. As a result, the liquid is atomized as fine particles having a uniform particle diameter, and is sprayed evenly from the tip of the nozzle head 127 toward the coated body 105. The diffusion width A of the liquid on the object 105 is spread evenly according to the liquid ejection amount.

  A relief valve 143 for keeping the fluid pressure of the electromagnetic valve 111 and the liquid pump 115 constant is provided in the liquid supply line 109 between the liquid pump 115 and the variable flow control valve 133.

The liquid motor 113, the variable flow control valve 133, and the electromagnetic valve 111 are configured to be controlled by a control device 145 (see, for example, Patent Document 1).
JP 2002-79144 A

  By the way, in the nozzle 103 provided in the conventional electrostatic liquid coating apparatus 101, it can be easily sprayed onto the coated body 105 using a release agent or lubricating oil that is a low-viscosity liquid. The coated body 105 is a food made of biscuits, cakes or rice crackers, and the surface of the coated body 105 cannot be coated with a high-viscosity liquid made of a substance such as high-viscosity liquid chocolate or creamy. there were. In this respect, industrial high-viscosity oils and high-viscosity liquids composed of other substances cannot be applied using the conventional electrostatic liquid application apparatus 101 as well.

  Therefore, to apply high viscosity liquid chocolate or creamy, high viscosity oil for industrial use, or other high viscosity liquids, apply manually by brushing or some other method. It was necessary to carry out by the mechanical method.

  In the conventional electrostatic liquid coating apparatus 101, a liquid material such as chocolate or creamy having a relatively low viscosity fluidity has been used. However, liquid chocolate or creamy liquid with low viscosity has a sticky surface, so that it is necessary to cover it with a thin resin wrap material or package it with a thin resin bag.

  In addition, when the above-described high-viscosity liquid is to be applied using the conventional electrostatic liquid application apparatus 101, in order to spray from the nozzle 103 in a mist state, in particular, the discharge flow path is provided inside the nozzle 103. In order to make it easy to flow through the narrow flow path of the group 107, it is necessary to reduce the viscosity of the high-viscosity liquid, and for that purpose, it is necessary to be heated and kept warm. However, since the nozzle 103 is applied with a negative high potential DC voltage (around −60 to −70 kV) as described above, there is a problem that the nozzle 103 cannot be heated by a heater or the like.

  Therefore, for example, as shown by a two-dot chain line in FIG. 5, the entire nozzle 103 is heated and kept warm by bringing a heat exchange pipe 147 through which, for example, high-temperature water passes, into contact with the side wall surfaces of the nozzle blades 119 and 121. However, in this respect, the heat exchange efficiency is low, the heat exchange efficiency is increased by the necessity of arranging the heat exchange pipes 147 at fine intervals, and the equipment for supplying high-temperature water. There was a problem of high cost.

  The present invention has been made to solve the above-described problems.

For high viscosity electrostatic blade type coating nozzle of the present invention includes a nozzle head made of electrically insulating material having a pair of first, second nozzle blade that face each other, said first Roh nozzle blade and the second nozzle blade A shim made of a conductive material sandwiched between and a discharge channel group of a high-viscosity liquid provided on the surface of the shim on the first nozzle blade side for discharging toward the coated body, and the discharge In order to directly heat the shim, the liquid supply conduit communicating with the channel group, the electrode provided on the first nozzle blade, and the shim to apply a voltage having a polarity opposite to that of the coated body . The height of the second nozzle blade formed in the second nozzle blade is such that a side surface on the shim side of the second nozzle blade is opened, and the opening side is closed by a side surface of the second nozzle blade of the shim. Viscous liquid A hot air chamber for supplying hot air for heating and keeping warm, a nozzle hot air supply passage for supplying the hot air to the hot air chamber, and a nozzle hot air discharge passage for discharging the hot air in the hot air chamber. To do.

  As will be understood from the means for solving the problems as described above, according to the present invention, since the high-viscosity electrostatic blade-type coating nozzle is electrostatic, for example, a negative DC high voltage is generated. Although the nozzle is energized, a hot air chamber for supplying hot air is provided inside the second nozzle blade, so that the entire nozzle, particularly the shim, can be efficiently passed without having to electrically heat the nozzle with a heater or the like. High-viscosity liquid can be heated and kept warm.

  As a result, the viscosity of high-viscosity liquids such as chocolate and creamy substances, industrial high-viscosity oils, and high-viscosity liquids composed of other substances can be reduced to make foods such as biscuits, cakes, It can spray uniformly on the surface of a member or another to-be-coated body, and can apply | coat to the said to-be-coated body uniformly.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIG. 1, a high-viscosity electrostatic coating apparatus 1 according to an embodiment of the present invention includes a high-viscosity electrostatic blade-type coating nozzle 3 (hereinafter simply referred to as “high-viscosity nozzle”). The high-viscosity nozzle 3 is provided with a high-viscosity liquid made of, for example, high-viscosity liquid chocolate or creamy, industrial high-viscosity oil, or other substances. It is sprayed toward the surface of food, industrial members, and other objects to be coated 5, and applies uniformly to the object to be coated 5.

  The coated body 5 is transported so as to pass below the high viscosity nozzle 3 by a transport device such as a conveyor device. When the coated body 5 passes a position below the high viscosity nozzle 3, the high viscosity is applied. Under the action of static electricity, the liquid is sprayed from the high-viscosity nozzle 3 toward the surface of the object 5 to be applied uniformly.

  The high-viscosity electrostatic coating apparatus 1 includes a high-viscosity nozzle 3 having a high-viscosity liquid discharge flow path group 7 to be discharged toward the object 5 and the discharge flow path group 7 of the nozzle 3. Correspondingly, a liquid supply line 9 communicating to supply the high-viscosity liquid, and an electromagnetic valve 11 provided in the liquid supply line 9 to open and close the liquid supply line 9, a coating hydraulic pressure. A circuit is configured.

  Further, the above-described hydraulic circuit for coating is configured such that a high-viscosity liquid is supplied from the liquid tank 17 to the liquid supply line 9 by the liquid pump 15 that is rotationally driven by the liquid motor 13.

  Next, the structure of the high-viscosity nozzle 3 constituting the main part of the embodiment of the present invention and the method for heating and keeping warm will be described in detail.

  Referring to FIG. 1, the high-viscosity nozzle 3 is arranged with one or many shims 25 as electrodes in a slit 23 formed between a pair of first nozzle blade 19 and second nozzle blade 21. The nozzle head 27 is provided. The first and second nozzle blades 19 and 21 are made of an electrically insulating material such as an insulating plastic, for example, and are, for example, longer than the coated body 5. The shim 25 is made of a conductive material made of, for example, a stainless steel sheet having a thickness of about 0.5 mm. The length of one shim 25 is 100 to 100 mm as shown in FIG. It is about 150 mm. Therefore, when the total length of the first and second nozzle blades 19 and 21 is long, a large number of shims 25 are arranged in the horizontal direction, and the total length is the same as the total length of the first and second nozzle blades 19 and 21. Are arranged to be

  Further, the nozzle head 27 is provided with a connector pin 31 constituting, for example, a power connector 29 as an electrode for applying a negative high voltage to the shim 25 so as to protrude from the side surface of the first nozzle blade 19. Yes.

  Further, between the surface of the shim 25 and the adjacent surface of the first nozzle blade 19, a liquid discharge flow path group 7 to be discharged toward the coated body 5 is formed. For example, the discharge flow path group 7 is etched at a groove depth C on one surface of the shim 25 (in this embodiment, the left side surface of the shim 25 in FIG. 1). Note that a liquid supply port 33 for supplying liquid is communicated with the discharge flow path group 7.

  2A and 2B and FIGS. 3A and 3B together, the surface of the second nozzle blade 21 adjacent to the back surface of the shim 25 that does not include the discharge flow path group 7 ( In this embodiment, a hot air chamber 35 is provided on the left side surface in FIG. The hot air chamber 35 is long and deep in the longitudinal direction of the second nozzle blade 21 (the left side surface in FIG. 1 and the left side surface in FIG. 3B) and the opening side of the groove portion is closed by the back surface of the shim 25. A hot air supply port 37 for supplying hot air to the hot air chamber 35 on the inner wall surface of the hot air chamber 35 in FIGS. 1 and 3A and 3B of the hot air chamber 35, and a hot air chamber A hot air discharge port 39 for discharging the hot air in 35 is communicated. The reason why the hot air chamber 35 is provided on the second nozzle blade 21 side is that a connector pin 31 constituting a power connector 29 as a power source as an electrode is provided on the first nozzle blade 19 side. This is to cause trouble.

  The hot air supply port 37 is connected to a nozzle hot air supply pipe 41 for supplying hot air, and the hot air outlet 39 is connected to a nozzle hot air discharge pipe 43 for discharging hot air. Has been. The nozzle hot air supply conduit 41 communicates with, for example, a nozzle hot air blower device 45 serving as a hot air source. The hot air from the nozzle hot air discharge pipe 43 is discharged to the outside or returned to the nozzle hot air blower device 45 and reheated.

  Further, as the shim 25, oil sumps 47A and 47B and discharge flow path groups 7A and 7B are etched at a depth C on the left surface in FIG. 2B, and this discharge flow path group. 7A and 7B extend from the sump 47A and 47B, and a large number of flow grooves are arranged in parallel toward the downstream side. The intervals between the flow paths positioned at the most downstream ends correspond to the liquid application widths WA and WB, and the application widths WA and WB can be set to, for example, about 50 mm.

  The oil reservoirs 47A and 47B communicate with a pair of liquid supply ports 33 in the nozzle blade 19 of the coating apparatus, and these liquid supply ports 33 are connected via a variable flow control valve 49 and an electromagnetic valve 11 as shown in FIG. And connected to the liquid pump 15. The variable flow control valve 49 adjusts the flow rate of the high-viscosity liquid in the liquid supply conduit 9. This is possible even without the variable flow control valve 49.

  The discharge flow path groups 7A and 7B act as capillary resistances, the resistance value is proportional to the length of the flow path, and the flow rate is inversely proportional to the square of the length. The application widths of the fluid discharged from the discharge flow path groups 7A and 7B are WA and WB, respectively. Therefore, by opening / closing the solenoid valve 11 on the upstream side of each of the discharge flow path groups 7A and 7B, the entire application width of the shim 25 can be changed to WA, WB, and WA + WB according to the object 5 to be applied. Is possible.

  Furthermore, relatively large circular openings 51 formed on both sides of the sumps 47A and 47B in the shim 25 are used to pass fixing bolts to a support bracket or the like of the entire coating apparatus. In addition, the relatively small circular opening 53 disposed in the area adjacent to the oil sumps 47A and 47B maintains the liquid tightness between the first and second nozzle blades 19 and 21 adjacent to the shim 25. It passes the set screw for assembling.

  In this embodiment, 16 channel grooves are arranged as discharge channel groups 7A and 7B in the application widths WA and WB, respectively. Furthermore, the discharge outlet 55 of the final flow path of the discharge flow path groups 7A and 7B formed as described above has a rectangular shape.

4A and 4B together, the first and second nozzle blades 19 and 21 have circular openings 51 and 53 similar to the circular openings 51 and 53 of the shim 25 described above. Is provided. Further, grooves 57 and 59 serving as liquid supply channels for efficiently supplying the high-viscosity liquid from the liquid supply port 33 to the oil sumps 47A and 47B of the shim 25 are shown in FIG. 4A of the first nozzle blade 19. Are formed long in the left and right longitudinal directions.

  Referring to FIG. 1 again, a relief valve 59 for keeping the fluid pressure of the electromagnetic valve 11 and the liquid pump 15 constant is provided in the liquid supply line 9 between the liquid pump 15 and the variable flow control valve 49. It is installed.

  The liquid motor 13, the variable flow control valve 49, and the electromagnetic valve 11 are each controlled by the control device 61 so as to adjust the supply amount of the high-viscosity liquid. Further, for example, a nozzle hot air blower device 45 serving as a hot air source controls the temperature of hot air supplied by a control device 61.

  Next, the operation of the above configuration will be described.

  Referring to FIG. 1, the heating and heat retaining action of the high-viscosity nozzle 3 will be described. Hot air from the nozzle hot air blower device 45 passes through the nozzle hot air supply pipe 41 and is provided with a hot air supply port 37 provided in the nozzle head 27. Into the hot air chamber 35. The entire high-viscosity nozzle 3 is efficiently heated and kept at an appropriate temperature from the inside of the second nozzle blade 21 by the hot air in the hot air chamber 35. In particular, since the back surface of the shim 25 is in contact with the hot air chamber 35, the heatability and heat retention are good. Subsequently, the hot air in the hot air chamber 35 is discharged to the outside from the hot air discharge port 39 through the nozzle hot air discharge conduit 43, or returned to the nozzle hot air blower device 45 and reheated.

  Next, the action of spraying and applying a high-viscosity liquid on the surface of the object 5 will be described.

  For example, the substrate 5 is conveyed by the conveyor device so as to pass below the high viscosity nozzle 3 of the high viscosity electrostatic coating apparatus 1. On the other hand, the high-viscosity liquid in the liquid tank 17 is sent from the liquid tank 17 through the liquid supply line 9 by the liquid pump 15 that is rotationally driven by the liquid motor 13. The electromagnetic valve 11 is opened, and the high-viscosity liquid in the liquid supply conduit 9 passes from the discharge passage groups 7 </ b> A and 7 </ b> B of the nozzle 3 toward the surface of the object 5 to be coated from each discharge port 55 of the final flow passage. Sprayed.

  At this time, since the entire high-viscosity nozzle 3 is kept at an appropriate temperature by the hot air in the hot air chamber 35 as described above, each of the discharge flow path groups 7A and 7B is in a good state in which the high-viscosity liquid easily flows. After passing through, each spray port 55 sprays on the surface of the to-be-coated body 5 on a conveyor apparatus.

  Furthermore, referring to FIG. 1, the operation when the high-viscosity liquid is sprayed from the high-viscosity nozzle 3 will be described in detail. The conveyor device on which the object 5 is applied is grounded and has a positive potential. Therefore, when a negative DC high voltage (around −60 to −70 kV) is applied to the shim 25 via the power connector 29, the electromagnetic valve 11 is turned on by the controller 61, and the variable flow control valve 49 increases the voltage. The viscous liquid is controlled by the control device 61 and supplied to the liquid supply port 33 through the liquid supply line 9. The high-viscosity liquid supplied from the liquid supply port 33 passes through the discharge flow path groups 7 </ b> A and 7 </ b> B of the shim 25. Since they are charged instantaneously while passing, charges of the same polarity repel each other. As a result, the high-viscosity liquid is atomized as fine particles having a uniform particle diameter, and sprayed uniformly from the discharge port 55 at the tip of the nozzle head 27 toward the substrate 5. The diffusion width A of the high-viscosity liquid on the substrate 5 is spread evenly according to the injection amount of the high-viscosity liquid.

  From the above, since the high-viscosity electrostatic coating apparatus 1 is electrostatic, a negative high-voltage direct current high voltage (around −60 to −70 kV) is supplied to the high-viscosity nozzle 3. Since the hot air chamber 35 for supplying the hot air whose temperature is controlled by the control device 61 is provided inside the second nozzle blade 21 of the nozzle 3, the high viscosity nozzle 3 does not have to be electrically heated with a heater or the like. However, the entire high-viscosity nozzle 3 can be efficiently heated and kept warm.

  As a result, the viscosity of high-viscosity liquid chocolate and creamy substances, industrial high-viscosity oils, and other high-viscosity liquids made of other substances can be reduced to reduce the viscosity of biscuits, cakes, rice crackers, and industrial products. It can spray uniformly on the surface of a member or another to-be-coated body, and can apply | coat to the said to-be-coated body uniformly.

1 is a schematic sectional view of an electrostatic coating apparatus for high viscosity according to an embodiment of the present invention. (A) is the front view in which the discharge flow path group was formed in one surface of the shim of embodiment of this invention, (B) is the state which expanded the cross section along the oil sump and the discharge flow path group FIG. (A) is the front view in which the hot air chamber was formed in the surface of the nozzle blade of embodiment of this invention, (B) is sectional drawing of the arrow III-III line of (A). (A) is a front view of the nozzle blade of embodiment of this invention, (B) is sectional drawing of the arrow IV-IV line of (A). It is a schematic sectional drawing of the conventional electrostatic type liquid coating device. (A) is the front view in which the discharge flow path group was formed in one surface of the conventional shim, (B) is the longitudinal cross-sectional view of the state which expanded the cross section along the oil sump and the discharge flow path group. is there.

Explanation of symbols

1 High viscosity electrostatic coating device 3 High viscosity nozzle (high viscosity electrostatic blade type coating nozzle)
5 Coating object 7, 7A, 7B Discharge flow path group 9 Liquid supply line 11 Solenoid valve 13 Liquid motor 15 Liquid pump 17 Liquid tank 19, 21 Nozzle blade 25 Shim 27 Nozzle head 29 Power connector (electrode)
31 Connector pin (electrode)
33 Liquid supply port 35 Hot air chamber 37 Hot air supply port 39 Hot air discharge port 41 Nozzle hot air supply pipe (nozzle hot air supply channel)
43 Nozzle hot air discharge pipe (nozzle hot air discharge path)
45 Nozzle hot air blower device 55 Discharge port 61 Control device

Claims (1)

First pair facing each other, and the nozzle head (27) made of an electrically insulating material having a second nozzle blade (19, 21), said first Bruno nozzle blade (19) and second nozzle blade (21) And a shim (25) made of a conductive material disposed between the shim (25) and a height provided on the surface of the shim (25) on the first nozzle blade (19) side so as to be discharged toward the coated body (5). The viscosity liquid discharge channel group (7), the liquid supply pipe line (33) communicating with the discharge channel group (7), and the shim (25) have a polarity opposite to that of the object to be coated (5). An electrode (31) provided on the first nozzle blade (19) for applying a voltage , and an inner part of the second nozzle blade (21) for directly heating the shim (25) ; and The shim (25) side of the second nozzle blade (21) Side is opened, yet the opening side the shim (25) second nozzle blade (21) is closed by the side surface of the formed hot air chamber for supplying hot air to heat-insulation of the high viscosity liquid (35) And a nozzle hot air supply passage (41) for supplying the hot air to the hot air chamber (35) and a nozzle hot air discharge passage (43) for discharging the hot air in the hot air chamber (35). High-viscosity electrostatic blade-type coating nozzle.

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