JP2012134161A - Paint applying apparatus and method for manufacturing enameled wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paint applying apparatus which can apply paint on a wire material without hindrance even when using paint of a type that is modified (cured) in a short time, and to provide a method for manufacturing an enameled wire.SOLUTION: A first paint 11 which is supplied from a first paint tank 12 and a second paint 13 which is supplied from a second paint tank 14 are mixed by a mixer 15 and supplied to a paint bath 18. Coating dies 19A to 19F are connected to the paint bath 18 through tubes 20A to 20F. A wire material 3 is introduced to the coating dies 19A to 19F through holes 20a formed in the tubes 20A to 20F. A paint 2 supplied to the paint bath 18 flows and drops inside the tubes 20A to 20F due to its self-weight, is continuously supplied to the coating dies 19A to 19F, and is applied on the surface of the wire material 3 by the coating dies 19A to 19F.

Description

  The present invention relates to a coating material coating apparatus for coating a wire material with a coating material and a method for manufacturing an enameled wire.

  In the production of wire rods such as enameled wire, the roller is immersed in a coating tank filled with paint, and the wire is continuously contacted with the upper surface of the roller to apply the paint to the wire, and then applied in a baking furnace. A manufacturing apparatus for baking paint is used (for example, see Patent Document 1).

  In addition, a coating guide plate having a plurality of slits, a protective plate, a seal plate, and an inclined plate are provided on one side surface of the coating tank with the upper end opened, and the coating material is filled up to a predetermined position of the slit and a wire rod is provided in the slit. There is also known a paint coating apparatus that passes a wire through a half hole formed in a part of the slit and applies a paint to the wire (for example, see Patent Document 2).

  In general, such an apparatus is provided with a paint circulation path for supplying and collecting a certain amount of paint to a coating tank and a painting tank, and storing a certain amount of paint in the coating tank and the painting tank so that coating can be performed stably. I am doing so.

  Here, a one-pack type (poly) urethane varnish has been used as a coating material for a conventional enameled wire or the like. This one-pack type (poly) urethane varnish is composed of two coating raw materials A and B having different functional groups as main components, and a coating raw material A in which masking that is removed by heating is applied to the functional group. The coating material B that has not been masked is mixed with a solvent, a blocking agent, or the like into one liquid.

  This one-pack type (poly) urethane varnish is completely masked on the functional group of the coating material A, so it does not react at room temperature even when mixed with the coating material B, but at around 100 ° C. during baking. Masking is removed, and the solvent evaporates in a heating atmosphere of 200 ° C. or higher, whereby the coating material A and the coating material B are urethane-bonded. Therefore, it can be used in a conventional paint coating apparatus that circulates paint before baking.

  However, organic solvents such as phenol, cresol, and xylene are used as the solvent for the one-pack type (poly) urethane varnish, but there are concerns about environmental pollution and biological poisoning. In addition, the price of solvents has soared in recent years due to the rise in naphtha and the decrease in energy resources, which is not economical. Therefore, a two-component (poly) urethane varnish that uses a low-boiling solvent such as an acetate solvent without using an organic solvent such as cresol or phenol, a blocking agent, or the like has attracted attention (for example, see Patent Document 3). . In addition, since a two-component paint has a fast reaction and high curability, when it is applied as an insulating paint, it is necessary to work in a short time.

The two-component paint has the following advantages over the one-component paint.
(1) The solvent component of the paint is less than half, and resources can be saved.
(2) The CO ₂ discharged from the baking furnace is also reduced to less than half, and the burden on the environment can be reduced.
(3) The baking temperature can be lowered and power can be saved.

Japanese Patent No. 3455564 JP 2004230324 A JP 2006-045484 A

  However, according to the conventional paint application device, all the paint supplied to the application tank and the application tank is not applied to the passing wire (running line). Therefore, it cannot be applied to a paint such as a two-component type that is altered (cured) in a short time during circulation.

  Accordingly, an object of the present invention is to provide a paint coating apparatus and an enameled wire manufacturing method capable of applying a paint to a wire without any trouble even if a type of paint that changes (hardens) in a short time is used. .

  To achieve the above object, the present invention provides a coating die for applying paint to a wire, a paint tank for supplying the paint to the coating die by its own weight, and a paint supply for supplying the paint to the paint tank The paint tank provides a paint application device connected to the painting die via a tube.

  In order to achieve the above object, the present invention provides a coating die for applying paint to a wire, a coating tank for supplying the coating to the coating die by its own weight, and supplying the coating to the coating tank. A paint supply unit, and the paint tank forms a paint layer having a predetermined thickness by applying the paint to the surface of the wire using a paint application device connected to the painting die via a tube. There is provided a method for producing an enameled wire, including a step of forming a film by baking the coating layer.

  According to the present invention, a coating material can be applied to a wire without any trouble even if a coating material that changes (hardens) in a short time is used.

It is a schematic block diagram which shows the coating material coating system which concerns on 1st Embodiment. It is a figure which shows partially the coating material coating device which concerns on 1st Embodiment. It is a top view which shows the detail of the paint tank of FIG. 2, a tube, and a paint die. It is a figure which shows the coating-material tank, tube, and coating-material die in the structure of FIG. It is a schematic block diagram which shows the coating material coating device which concerns on the 2nd Embodiment of this invention. FIG. 6 is a plan view of the paint tank of FIG. 5. It is the side view seen from the wire introduction side of the paint tank shown in FIG. It is a top view which shows the principal part of the coating material coating device which concerns on 3rd Embodiment. It is sectional drawing of the coating material coating device shown in FIG.

[First Embodiment]
(Configuration of paint application system)
FIG. 1 is a schematic configuration diagram showing a paint coating system according to a first embodiment of the present invention.

  The paint application system 1 includes a paint application device 10 that applies a paint 2 by mixing two liquids to a wire 3, a baking furnace 4 that dries the paint 2 applied to the wire 3, and a wire material to the paint application device 10 and the baking furnace 4. 3 (six times in this case), sheaves (or rollers) 5A to 5D having grooves on the outer peripheral surface for transporting the wire 3, a catalyst device 6 attached to the baking furnace 4, and a catalyst device 6 and an exhaust duct 7 attached to the exhaust port 6.

  In addition, although illustration is abbreviate | omitted, the winding machine etc. which are not shown in figure are installed in the back | latter stage of the baking furnace 4 with respect to the wire 3. FIG. Further, a core wire feeder, an annealing furnace, and the like (not shown) are installed in the front stage of the sheave 5A. Furthermore, in the first embodiment, the number of times the wire 3 passes the sheaves (or rollers) 5A to 5D will be described as six, but this number is not limited to six.

  In the present embodiment, as the coating material, the first coating material 11 in which a coating material A in which incomplete masking is applied to a functional group having a fast reaction is mixed using a plurality of solvents, and the first coating material 11 are: Paint 2 composed of a two-component (poly) urethane varnish mixed with a second paint 13 obtained by mixing a coating material B having different functional groups using a plurality of solvents with a mixer 15 immediately before application to the wire 3 Is used. In addition, incomplete masking may be applied to the functional group of the coating material B.

  For example, it is possible to use a two-component reactive polyurethane-based electrically insulating paint composed of a first paint 11 having an isocyanate group-containing compound and a second paint 13 having an active hydrogen-containing compound.

  In general, a paint application apparatus using a one-component type paint uniformly applies a paint supplied from a paint supply tank to the surface of a running line using an application roll or the like, and then applies the paint applied with a coating die. The paint circulation type is used in which the excess paint is removed and the excess paint is returned to the paint supply tank for reuse. When such a one-component type coating material application apparatus is applied to a two-component type, the coating material is cured in a coating material supply tank or the like, and it is difficult to work for a long time. Therefore, a paint coating apparatus using a one-pack type paint cannot be applied to a two-pack type.

(Configuration of paint coating device)
As shown in FIG. 1, the paint application device 10 includes a first paint tank 12 in which a first paint 11 is stored, a second paint tank 14 in which a second paint 13 is stored, and a predetermined position. The mixer 15 for mixing the first paint 11 and the second paint 13, the pipes 16A and 16B connecting the mixer 15 and the paint tanks 12 and 14, and the pipes 16A and 16B are provided in the middle. Pumps 17A and 17B for pumping paint to the mixer 15, a paint tank 18 for receiving paint falling from the mixer 15, and coating dies 19A to 19F through which the wire 3 is inserted (the coating dies 19B to 19F are the surfaces of the coating die 19A) Tubes 20A to 20F (the tubes 20B to 20F are papers of the die holder 21) that connect the paint tank 18 and the coating dies 19A to 19F. And it is provided in the depth direction), and a die holder 21 for holding the coating dies 19A-19F. In the first embodiment, the first paint tank 12, the second paint tank 14, the mixer 15, and the pipes 16A and 16B constitute a paint supply unit.

  FIG. 2 is a diagram partially showing the paint coating apparatus according to the first embodiment.

  A liquid level sensor 22 is disposed above the paint tank 18, and an output signal Ss of the liquid level sensor 22 is input to a control panel (control unit) 24 that controls the pumps 17A and 17B via a signal line 23. The The liquid level sensor 22 is a sensor that detects the liquid level of the paint in contact or non-contact. As an example, the mixer 15 is arranged at a position higher than the position of the paint tank 18 in the paint application apparatus 10. However, since the mixer 15 uses the pressure of the pumps 17 </ b> A and 17 </ b> B, It can also be arranged at the same height or low position.

  The tubes 20A to 20F are arranged in a curved shape, and the upper and lower ends of the tubes 20A to 20F are fixed to the paint tank 18 and the coating dies 19A to 19F by fixtures 25 and 26, respectively. And the hole 20a for allowing the wire 3 conveyed through the sheave 5A to pass through the coating dies 19A to 19F is formed in the tubes 20A to 20F. The holes 20a are formed by, for example, attaching a number of injection needles corresponding to the number of the wire rods 3 to the jig at predetermined intervals and inserting the injection needles into predetermined positions of the plurality of tubes 20A to 20F along the guides.

  The wire 3 is introduced into the tubes 20A to 20F from the outside of the tubes 20A to 20F through the holes 20a and guided to the coating dies 19A to 19F. Therefore, it is desirable that the coating dies 19A to 19F be provided so that the forming direction of the die holes and the passing direction of the wire 3 are in a straight line. The tubes 20A to 20F are connected so that the paint 2 can be continuously supplied in one direction (from the paint tank 18 to the coating dies 19A to 19F) by causing the paint 2 to flow from the paint tank 18 based on its own weight. However, instead of connecting in a curved shape, the fixing tool 25 may be connected to the fixing tool 26 at a right angle. That is, the tubes 20 </ b> A to 20 </ b> F can be formed so as to include a linear portion or a curved portion formed with a predetermined curvature between the fixture 25 and the fixture 26.

  The tubes 20 </ b> A to 20 </ b> F can form the above-described holes 20 a, have a hardness that can maintain the shape, elasticity that prevents the paint 2 from leaking from the inside, and have characteristics that do not dissolve by the solvent contained in the paint 2. Formed of material. As such tubes 20A to 20F, for example, a fluororubber tube, a polyethylene tube, a silicon tube, a Teflon tube (Teflon is a registered trademark), a nylon tube, and a PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer) tube FEP (tetrafluoroethylene / hexafluoropropylene copolymer) tube, vinyl tube, and the like can be used.

(Composition of paint dies)
FIG. 3 is a plan view showing details of the paint tank, the tube, and the painting die shown in FIG. FIG. 4 is a diagram showing a paint tank, a tube, and a painting die in the configuration of FIG. In FIGS. 3 and 4, a part is broken away.

  The coating dies 19A to 19F are held by the die holder 21 at predetermined intervals, and one ends of the tubes 20A to 20F are connected to the coating dies 19A to 19F, respectively. The other ends of the tubes 20 </ b> A to 20 </ b> F are connected to a paint tank 18 having substantially the same size as the die holder 21.

(Operation of paint application system)
Next, the operation of the paint application system will be described.
First. As shown in FIG. 1, the wire 3 is laid out with the path of the sheave 5A → the paint coating apparatus 10 (tube 20A → the coating die 19A) → the baking furnace 4 → the sheave 5B → the sheave 5C → the sheave 5D → the sheave 5A as one path. .

  Further, the wire 3 that has passed one pass is passed through the route of the sheave 5B → the sheave 5C → the sheave 5D → the sheave 5A → the tube 20B → the coating die 19B → the baking furnace 4 → the sheave 5B, and the second pass is wired. Thereafter, in the same manner, the third to sixth passes are formed through the wire 3 in each sheave, tubes 20C to 20F, coating dies 19C to 19F and the baking furnace 4, and the wire 3 drawn out from the sheave 5B through the coating die 19F is cooled. Transport to an apparatus (not shown).

  Next, the operation of the baking furnace 4 is started, and the pumps 17A and 17B are driven based on the initial settings, whereby the first paint 11 from the first paint tank 12 and the second paint tank 14 from the second paint tank 14 are driven. 2 paint 13 is supplied to the mixer 15. At the same time, the operation of a drive mechanism (not shown) is started, and the feeding of the wire 3 to the coating material application apparatus 10, the conveyance, and the winding by the winder are started.

  The mixer 15 mixes the first paint 11 supplied from the first paint tank 12 and the second paint 13 supplied from the second paint tank 14 to generate the paint 2, and this paint 2 Is supplied to the paint tank 18 by its own weight. The paint 2 supplied to the paint tank 18 is continuously supplied to the coating dies 19A to 19F as a predetermined amount is accumulated in the paint tank 18 and a predetermined amount descends in the tubes 20A to 20F by gravity. The tubes are stored in the tubes 20A to 20F on the upstream side of the coating dies 19A to 19F. The coating dies 19A to 19F are applied to the surface with the coating material 2 in an amount corresponding to the diameter of the die hole by passing the coating material 2 and the wire 3 stored in the tubes 20A to 20F. By repeatedly applying the coating material 6 times, six coating layers are formed on the surface of the wire 3 that has come out of the coating die 19F, and are baked in the baking furnace 4 to form a coating film. .

  The tubes 20A to 20F are connected to the coating tank 18 and the coating dies 19A to 19F in a curved shape or a right angle by the fixtures 25 and 26, whereby the coating 2 in the tubes 20A to 20F is blocked from the outside air. The pipes 20A to 20F are fed out in one direction (from the coating tank 18 to the coating dies 19A to 19F) without leaking. As described above, the coating tank 18 and the coating dies 19A to 19F are arranged with a drop in which the coating 2 flows without staying in the tubes 20A to 20F. Applied.

  The liquid level of the paint 2 in the paint tank 18 is detected every predetermined time by the liquid level sensor 22 and sent to the control unit 24 as an output signal Ss. Based on the output signal Ss, the control unit 24 controls the pumps 17A and 17B so that the liquid level of the paint 2 in the paint tank 18 is maintained at a predetermined level.

  In the wire 3 to which the paint 2 is applied by the coating dies 19 </ b> A to 19 </ b> F, the solvent in the paint 2 evaporates in the process of passing through the baking furnace 4, and the baked paint 2 is fixed to the surface of the wire 3. In the evaporated solvent, harmful components and components involved in environmental destruction are removed by the catalyst device 6, and other vaporized components are discharged from the exhaust duct 7 into the atmosphere.

(Effects of the first embodiment)
According to the first embodiment described above, the two-component paint 2 that changes in a short time flows based on its own weight through the tubes 20A to 20F attached so as not to cause paint leakage. Since it is supplied to the coating dies 19A to 19F without stagnation in a short time, the paint 2 is blocked from contact with the outside air to prevent thickening and curing of the paint 2, and the advantages of the two-component paint Application that makes the most of it becomes possible. In order to prevent dust and dirt from being mixed into the paint 2, the upper part of the paint tank 18 may be covered with a lid member or a cover to the extent that the supply of the paint 2 is not hindered.

[Second Embodiment]
FIG. 5 is a schematic configuration diagram showing a paint coating apparatus according to the second embodiment of the present invention.

  In this embodiment, in the coating material application apparatus 10 according to the first embodiment, a paint tank 30 having an L shape is directly connected to a coating die instead of the tubes 20A to 20F. This is the same as in the first embodiment. In the following description, portions having the same configuration and function as those of the first embodiment are denoted by the same reference numerals. In the present embodiment, the L-shaped paint tank 30 is used. However, the present invention is not limited to this, and the paint having a shape that the paint 2 is supplied to the painting dies 19A to 19F without stagnation. If it is a tank, the same effect can be acquired.

  6 is a plan view of the paint tank shown in FIG. 5, and FIG. 7 is a side view of the paint tank shown in FIG. 6 as viewed from the wire introduction side.

  The paint tank 30 has a bowl shape with an opening at the top, and six slits 32 for allowing the wire 3 to pass through are provided on the front wall 31 provided on the bottom plate 37 in a vertical combination with the side walls 38A and 38B. A rear wall 33 provided on the bottom plate 37 has a die fixing screw 34 for holding the entrance side of the coating dies 19A to 19F. The interior of the paint tank 30 is divided into front and rear parts by a partition member 35 (the side on which the slit 32 is provided is the front and the side on which the coating dies 19A to 19F are provided is the rear), and the front wall 31 and the partition member Between 35, a seal member 36 having a cut 36a that allows the wire 3 to be inserted from the upper opening to a predetermined position is inserted.

  In the present embodiment, the wire 3 is passed through the slits 32 and the seal member 36 to the coating dies 19A to 19F. Other line routes are the same as those in the first embodiment. The paint 2 supplied from the mixer 15 flows and accumulates in the paint tank 30, and the paint 2 is supplied to the coating dies 19 </ b> A to 19 </ b> F from below and applied to the wire 3.

  According to the second embodiment, the route until the paint 2 moves to the coating dies 19A to 19F is not necessarily one direction, but is stored in the upstream side of the coating dies 19A to 19F. The paint 2 can be supplied to the coating dies 19A to 19F with almost no stagnation.

  Moreover, according to 2nd Embodiment, when the wire 3 passes from the coating tank 30 to the coating dies 19A-19F, the coating 2 in the coating tank 30 is caused by the vortex of the coating 2 generated around the wire 3. It is possible to apply the paint 2 to the wire 3 without stagnation by constantly flowing in the direction of the coating dies 19A to 19F.

  In addition, it is preferable that the inside of the coating tank 30 has a capacity that can be influenced by the vortex of the coating 2 generated around the wire 3. For example, the amount of coating applied from the coating dies 19A to 19F to the wire 3 per minute is T (cc / min), and the time from the coating 2 being supplied to the coating tank 30 to curing is t (min). In this case, the paint tank 30 has a capacity of T × t (cc) or less, so that the paint 2 can flow without being cured in the paint tank 30. That is, for the purpose of suppressing the hardening of the paint 2 and ensuring the fluidity of the paint 2, the paint tank 30 is preferably formed to have a capacity of T × t (cc) or less.

  Moreover, in the coating tank 30, the space | interval p of the adjacent wire 3 is 5-20 mm, It is good to adjust in the range of 5-10 mm preferably. If the interval p is larger than 20 mm, it may be difficult to generate a vortex around the wire 3. If the interval p is smaller than 5 mm, the paint 2 will flow too much and be supplied stably to the coating die. May be difficult to do. The viscosity of the paint 2 at this time is 0.1 to 10 Pa · s, preferably 1 to 3 Pa · s. The distance between the wires 3 and the viscosity of the paint 2 are within the above ranges, and the distance by which the wire 3 moves within the paint tank 30 per unit time is appropriately adjusted to be within a range of 10 to 200 mm. The vortex of the paint 2 can be generated around 3. Thereby, the paint 2 in the paint tank 30 constantly flows in the direction of the painting dies 19A to 19F, and can supply the paint 2 to the painting dies 19A to 19F without stagnation. Thereby, although there is a slight curing that does not cause a problem in the production in the paint tank 30, it is possible to operate for a long time (for example, continuous operation for 24 hours or more). The control unit 24 is based on a signal from the liquid level sensor 22 so that the liquid level of the paint 2 stored in the paint tank 30 is constant at a height in the range of 10 to 20 mm from the bottom of the paint tank 30. It is preferable to control the operation of the pump 17A and the pump 17B.

[Third Embodiment]
FIG. 8 is a plan view showing the main part of the paint coating apparatus according to the third embodiment of the present invention, and FIG. 9 is a cross-sectional view of the paint coating apparatus shown in FIG. In FIG. 8, a part of the tube is shown by being broken.

  In the second embodiment, the coating tank 30 and the coating dies 19A to 19F are divided and provided in the second embodiment, and the two are connected by tubes 20A to 20F, and the front wall 31 of the coating tank 30 and The partition member 35 is inclined, and other configurations are the same as those of the first embodiment. In addition, about the wiring method of the wire 3 in the coating material coating apparatus 10, and the coating method, since it is the same as that of 2nd Embodiment, description is abbreviate | omitted.

  According to the third embodiment, the tubes 20A to 20F are provided between the rear wall 33 of the paint tank 30 and the coating dies 19A to 19F, so that the coating dies 19A to 19F are compared with the second embodiment. The stagnation of the paint 2 supplied to can be reduced.

  Next, examples will be described. The present inventors verified the Example by the following conditions using the coating-coating system 1 shown in FIG.

  A copper wire having a conductor diameter of 0.40 mm is used as the wire rod 3 and is formed by mixing the two-component first paint 11 and the second paint 13 which are thickened in about 30 minutes and cannot be applied when mixed. An enameled wire was manufactured by applying and baking the coating material 2 on the wire 3 to a film thickness of 0.015 mm.

  Note that an isocyanate group-containing urethane prepolymer solution (manufactured by Auto Chemical Industry Co., Ltd.) having a nonvolatile content of 70% by mass was used for the two-pack type first paint 11, and the two-pack type second paint 13 was non-volatile. A 70% by weight polyester polyol solution (manufactured by Auto Chemical Industry Co., Ltd.) was used.

  Also, the inner diameter of the coating die 19A for the first pass of the coating device 10 is 0.43 mm, the coating die 19B for the second pass is 0.46 mm, and the coating dies 19C to 19F after the third pass are also increased by 0.03 mm. The coating speed (= conveyance speed of the wire 3) was 50 m / min, and the baking temperature was in the range of 350 ° C. to 410 ° C. Furthermore, the paint consumption per pass was 1.3 cc / min, the volume inside the coating dies 19A to 19F was 0.1 cc, and the volume inside the tube was 2.8 cc. In addition, the paint coating apparatus 10 was designed with the capacity of the paint tank 18 for 6 passes set to 21.6 cc.

  As a result, it was confirmed that the coating material application apparatus 10 used up the coating material 2 in 5 minutes. Furthermore, the paint 2 in the paint coating apparatus 10 was not cured even after 24 hours of continuous operation. As described above, according to the coating material application system 1 according to the present invention, even if the wire 3 is coated using the two-component coating material 2 that changes in quality with time, the coating material 2 is not cured and is stably provided. It was confirmed that it could be applied.

  Next, the present inventors verified with the paint coating system 1 provided with the paint coating apparatus 10 shown in FIG. A copper wire having a conductor diameter of 0.40 mm is used as the wire 3, and the first paint 11 made of an isocyanate group-containing urethane prepolymer solution (manufactured by Auto Chemical Industry Co., Ltd.) having a nonvolatile content of 70% by mass; Using a two-component paint 2 formed by mixing a second paint 13 made of a polyester polyol solution (manufactured by Auto Chemical Industry Co., Ltd.), an enameled wire is formed by applying and baking the wire 3 to a film thickness of 0.032 mm. Manufactured.

  Further, in Example 2, the inner diameter of the first-pass coating die 19A of the coating material application apparatus 10 is 0.43 mm, the second-pass coating die 19B is 0.44 mm, and the third and subsequent coating dies 19C to 19F. The coating speed (= conveyance speed of the wire 3) was 50 m / min, and the baking temperature was in the range of 350 ° C. to 410 ° C. Furthermore, the paint consumption per pass was 0.5 cc / min, and the volume inside the coating dies 19A to 19F was 0.25 cc. Further, the capacity of the paint tank 30 for 6 passes shown in FIG. 6 is 36.0 cc (paint 2 in the paint tank 30 = 24.0 cc), the interval between the adjacent wires 3 is 10 mm, and the liquid of the paint 2 The coating material application apparatus 10 which supplies the coating material 2 was designed so that a surface might become a fixed amount in the position of 20 mm height from the bottom of the coating material tank 30. FIG.

  As a result, in Example 2, the coating material application apparatus 10 does not become hard to flow because the coating material 2 is cured in the coating material tank 30, and can generate a stable vortex around the wire 3; The paint 2 constantly flowed continuously in the direction of the painting die, and the paint 2 could be supplied to the painting die without stagnation. Even after 24 hours of continuous operation, the paint 2 in the paint coating apparatus 10 could be stably applied to the wire 3 without being cured.

  Next, the present inventors verified with the paint application system 1 provided with the paint application apparatus shown in FIGS. While using a copper wire having a conductor diameter of 0.40 mm as the wire 3, and using the paint 2 formed by mixing the same two-component first paint 11 and second paint 13 as in Example 2, An enameled wire was manufactured by coating and baking to a film thickness of 0.032 mm.

  In the third embodiment, the paint tank 30 having the same capacity (36.0 cc) as in the second embodiment and the tubes 20A to 20F having the same volume (2.8 cc) as in the first embodiment are used as the fixture 25. The enameled wire was manufactured by applying and baking the coating 2 on the wire 3 in the same manner as in Example 2 except that the coating device was used. Note that the amount of the paint 2 in the paint tank 30 in Example 3 was set to 24.0 cc as in Example 2.

  As a result, also in Example 3, the paint 2 does not harden and flow in the paint tank 30, and stable vortices can be generated around the wire 3. It continuously flowed in the direction of the painting die, and the paint 2 could be supplied to the painting die without stagnation. Even after 24 hours of continuous operation, the paint 2 in the paint application apparatus could be stably applied to the wire 3 without being cured.

  In addition, this invention is not limited to said each embodiment and Example, A various deformation | transformation is possible within the range which does not change the summary. For example, the combination of the components between the embodiments can be arbitrarily performed.

  For example, in each of the above-described embodiments, the horizontal paint coating apparatus 10 is configured such that the arrangement of the coating path and the baking furnace 4 is horizontal (the direction perpendicular to the direction of gravity). It is also possible to form a vertical paint coating apparatus in which the arrangement is vertical (direction parallel to the direction of gravity).

  Further, in each embodiment of the present invention, a two-component varnish is used for the paint 2, but the present invention is not limited to this. The paint raw materials A and B have different functional groups from the paint raw materials A and B. A three-component, four-component,..., N-component (n is a positive integer) varnish obtained by mixing a plurality of coating material raw materials having a coating composition 2 can be used. Furthermore, a conventional one-pack type varnish can also be used for the paint 2, and since this one-pack type does not require the circulation performed by the conventional paint coating apparatus, a paint with less impurities than the conventional one can be used. Can be applied and baked.

  In each embodiment of the present invention, the liquid level sensor is arranged above the paint tank to detect the liquid level of the paint in the paint tank, thereby controlling the paint in the paint tank to a certain amount. However, for example, a detection method such as detecting the weight of the paint tank with a load sensor, detecting the liquid level with a contact type sensor such as a limit sensor or a non-contact type sensor using capacitance or optical change, etc. It is possible to automatically control so that the amount of paint stored in the paint tank is constant.

  Further, in the second embodiment and the third embodiment of the present invention, a partition member for partitioning each wire 3 may be provided in the paint tank 30. Although the shape of the cross section perpendicular | vertical with respect to the advancing direction of the wire 3 in a partition member is not specifically limited, The thing of a shape which consists of a triangle, a rectangle, etc. can be used. In addition, the height of the partition member from the bottom plate of the paint tank 30 is preferably lower than the height of the liquid level of the paint 2 maintained at a constant amount (however, higher than the height at which the wire 3 is located). By providing such a partition member, the stagnation of the paint 2 is further relaxed.

DESCRIPTION OF SYMBOLS 1 Paint application system 2 Paint 3 Wire rod 4 Baking furnace 5A-5D Sheave (or roller)
6 Catalyst device 7 Exhaust duct 10 Paint coating device 11 First paint 13 Second paint 12 First paint tank 14 Second paint tank 15 Mixers 16A, 16B Pipes 17A, 17B Pumps 18, 30 Paint tanks 19A-19F Coating dies 20A to 20F Tube 20a Hole 21 Die holder 22 Liquid level sensor 23 Signal line 24 Control panel 25, 26 Fixture 31 Front wall 32 Slit 33 Rear wall 34 Die fixing screw 35 Partition member 36 Seal member 36a Cut 37 Bottom plate 38A, 38B Side wall

Claims (9)

A coating die for applying paint to the wire, a paint tank for supplying the paint to the coating die by its own weight, and a paint supply unit for supplying the paint to the paint tank,
The paint tank is connected to the coating die through a tube.   The paint application apparatus according to claim 1, wherein the tube has elasticity so that the paint does not leak from the inside.   The paint application apparatus according to claim 1, wherein the tube is formed of a material that is insoluble in a solvent contained in the paint.   The paint coating apparatus according to claim 1, wherein the tube is connected to the coating die in a curved shape or a right angle shape.   The said wire is a coating material coating device in any one of Claims 1-4 introduced into the inside of the said tube from the exterior of the said tube through the hole formed in the said tube.   The paint application apparatus according to claim 1, wherein the paint is a mixture of a plurality of paint raw materials having different functional groups.   The paint is a mixture of a first paint made of a paint raw material having a functional group having a fast reaction and a second paint made of a paint raw material having a functional group different from the first paint. The coating material application apparatus in any one of 1-6.   The sensor according to claim 1, further comprising: a sensor that detects a supply amount of the paint into the paint tank; and a control unit that controls the supply amount to the paint tank based on a detection result of the sensor. Paint applicator. Applying the paint to the surface of the wire using the paint application apparatus according to any one of claims 1 to 8 to form a paint layer having a predetermined thickness;
And a step of baking the paint layer to form a coating film.

Images