JP5337994B2 - Thin wire film forming method and thin wire film forming apparatus using the same - Google Patents

Description

  The present invention relates to a method for coating the periphery of a wire and a thin-film coating apparatus using the same, and particularly relates to the production of a thin-line film having a wire diameter of 6.5 to 200 μm.

  Conventionally, for the purpose of elucidating brain functions, single nerve activities in freely moving animals have been recorded. As the metal microelectrode used at that time, a cross section obtained by insulating a metal wire of about several tens to 100 μm with a paint and cutting it with scissors or the like has been used.

  For this reason, the cross section of the metal wire is deformed, or the insulating material extends and adheres to the metal cross section by shearing with scissors, and cannot be sufficiently utilized as a microelectrode. On the other hand, the present inventors tried a method in which a thin metal wire was grooved in a thermosetting resin solution such as an epoxy resin, pulled up, and heated, but the coating formed around the metal wire Many pinholes were generated, and the coating amount was uneven in the longitudinal direction of the metal wire, resulting in the formation of a bead-shaped resin lump.

  In view of this, an insulating varnish application method and apparatus for applying an insulating varnish to ultrafine wires have been proposed (see Patent Document 1). As for the thin film, a method has been proposed in which a metal wire is sent to a resin coating tank and brought into contact with a drum in the coating tank (see Patent Document 2).

JP-A-8-298035 Japanese Patent Publication No. 7-50721

  However, the technique of the above-mentioned patent document 1 uses a coater roll and varnish squeezing felt to apply an insulating varnish to the ultrafine wire by utilizing capillary action, and insulates the ultrafine wire and the coater roll without contacting them. Since varnish is applied, frictional resistance is eliminated and accidents due to line runout are prevented, but in order to apply insulating varnish multiple times on a fine wire to increase the thickness of the coating, multiple fine wires wound in a roll are used. It was necessary to install and remove it twice, which took a lot of work. Further, Patent Document 2 is a technique for coating a thin wire of 10 μm to 50 μm, but with this technique, it is difficult to create a portion that is not intentionally covered except at the end of a metal wire having a length of several tens of centimeters. In addition, the mechanical strength of the coating formed by this technique is not sufficient. For example, when a cylindrical cavity is formed by dissolving metal by electrolysis from the tip for use as a single nerve activity recording electrode, it depends on the coating. The wall collapses and the strength at the time of brain parenchyma cannot be secured.

In view of the above problems, as a result of earnest research, the present inventors applied a resin multiple times from different directions with respect to the circumference of the wire to a fine wire such as metal (for example, less than 40 μm), so that the periphery of the fine wire establishing a technique of forming a film, leading to provide a coating producing apparatus thin wire used coating method of creating fine lines that allows the film creation and thereto.

  For this reason, the thin wire film forming method of the present invention comprises a step of determining a coating position and a coating speed around the wire and applying the film material by a coating means, and the coating portion of the coating means is arranged in the circumferential direction of the wire material. Forming a coating around the wire by bringing it into contact with one end side and moving it in the longitudinal direction, and further bringing the coating part of the coating means into contact with the wire from the other circumferential direction and moving it in the longitudinal direction; One feature.

  Further, in the step of determining the coating position and coating speed around the wire and applying the coating material by the coating means, the coating material further includes a measuring means for measuring the viscosity of the coating material, and the viscosity measured by the measuring means Based on the above, the second feature is that the application means determines the application speed of the application means.

  The third feature is that the wire is one of metal, plastic, and ceramic, and is a thin wire having a wire diameter of 6.5 to 200 μm. In addition, in the film preparation method of this invention, it can be used effectively for application | coating of a wire with a wire diameter of 6.5-100 micrometers, and can be used more effectively at a wire diameter of 6.5-40 micrometers. A wire with a diameter of 6.5 to 100 μm can be used for a single nerve activity recording electrode, and a wire with a diameter of 6.5 to 40 μm is particularly suitable for detailed recording of nerve activity.

  The film material is a thermosetting resin of any one of an epoxy resin, a melamine resin, and a phenol resin, and the application part of the application means is a brush, a brush, or a roller, according to a fourth feature.

  Furthermore, it is a fifth feature that the method further includes a step of transporting the thin wire coated with the coating material by the coating means, and a step of thermally curing the transported coating material of the thin wire.

  In addition, a sixth feature is that a step of applying a coating material to the thermally cured coating material and a step of further thermosetting the coating material are repeated a plurality of times. At this time, it is desirable that the position where the coating portion is brought into contact with the thermally cured coating material is set at a predetermined angle with respect to the position where the coating portion is contacted first. In this step of repeatedly applying, the coating material is the same coating material. It is not limited to.

Further, the thin wire film forming apparatus of the present invention comprises a coating means for applying a coating position and a coating speed around the wire material by a control means around the wire material having a wire diameter of 6.5 to 200 μm, a thermosetting device for thermosetting the wire, a coating unit of the coating means brush, a brush or a roller in contact with the circumferential direction one end side of the wire is moved in the longitudinal direction, the other circumference of the further該線material The brush, brush or roller is contacted from the direction and moved in the longitudinal direction to form a coating, and the coating is formed around the wire by thermosetting with a thermosetting means.

  According to the method and apparatus for producing a thin wire film according to the present invention, the viscosity of a thermosetting resin that forms a film around the wire is measured, and control based on the measured viscosity of the wire using a brush, brush, or roller. Since the thermosetting resin is applied while being moved in the longitudinal direction while being brought into contact with one end in the direction, and further being applied while being moved in the longitudinal direction while being brought into contact with the other end in the circumferential direction of the wire, the wire diameter is 6.5. A coating can be formed even with a thin wire having a diameter of ˜200 μm.

  This method for producing a film has an excellent effect that the film formation position of the target wire can be arbitrarily set. Due to this effect, a portion having no coating can be created not only at the end portion in the longitudinal direction of the wire but also at the center portion, and for example, an electrical contact can be constituted by this portion.

  In addition, by partially changing the number of repetitions of the coating and thermosetting processes at the application point of the wire, the film thickness of the coating can be controlled in both the longitudinal direction and the circumferential direction of the wire. In addition, the mechanical strength of the coating is ensured by applying the film thickness in the circumferential direction of the wire to a uniform thickness.For example, in a single nerve activity recording electrode, the metal is electrolyzed from the tip to form a cylindrical cavity by the coating. Even when created, the shape can be maintained when the brain parenchyma is inserted.

  Further, since the resin to be coated is a thermosetting resin and is thermally cured by a thermosetting means, there is an effect that a wire having a high mechanical strength of the film can be produced.

It is process drawing which shows the film preparation means of this invention. It is a schematic explanatory drawing which shows one Example of the film production apparatus of this invention.

  Hereinafter, the thin film coating method of the present invention will be described with reference to the drawings. FIG. 1 is a process diagram showing the film forming means of the present invention.

  As shown in the figure, the thin wire film forming method of the present invention includes a step S1 in which a weight is attached to one end side of the wire rod to hang down and the other end is held, and the wire material whose viscosity is measured is controlled by the control means. Step S2 for determining the coating position and the coating speed around the substrate and applying it by the application part of the application means, and Step S3 for conveying the wire applied in Step S2 by the conveyance means and heating it by the heating device. S2 and step S3 are repeated a plurality of times depending on the thickness of the film to be created. Hereinafter, each step will be described.

(Step S1)
The wire is any one of metal, plastic, and ceramic, and a thin wire having a wire diameter of 6.5 to 200 μm is used. A weight is attached to one end of the wire, and the other end is held and suspended. At this time, a wire rod having a wire diameter of less than 20 μm may be twisted when suspended, and an optimum weight and weight of the weight to be used are selected.

  And this wire is hold | maintained to the last step in the suspended state, and is moved by the conveyance means as needed.

  As a film material that covers the periphery of the suspended wire, a thermosetting resin of any one of an epoxy resin, a melamine resin, and a phenol resin is used. If necessary, the thermosetting resin is diluted with a suitable solvent.

  In addition, in order to prevent volatilization of the solvent of said thermosetting resin solution, it is desirable that the container be sealed.

  The application part of the application means is put into the thermosetting resin solution. A brush, a brush, or a roller is selected as the application portion, and an optimum one is used depending on the material and wire diameter of the wire. Next, the application part to which the thermosetting resin solution is adhered is brought into contact with one end side in the circumferential direction of the suspended wire. And this application | coating part is moved to a perpendicular | vertical downward direction at a fixed speed, contacting the surface of a wire. At this time, the position of the surface of the wire that is brought into contact with the coating part, the moving speed in the vertical downward direction, and the movement end point are determined in advance by the control means, and the thickness of the coating film is formed in accordance with the moving speed of the coating part.

  And the coating part which contacted the circumferential direction one end side of the said wire rod, and formed the film was once moved away from the surface of the wire rod, moved to the other end side of the circumferential direction of this wire rod, and the coating portion was contacted first. It is made to contact the other end side which opposes the circumferential direction one end side of a wire. Furthermore, this application part is moved vertically downward at a constant speed while being in contact with the surface of the wire, and the contact of the application part is released at the aforementioned movement end point position.

  With this configuration, a film having an arbitrary length can be formed from an arbitrary position around the wire. Moreover, the coating material is applied at a speed that is controlled by the control means, and the coating material is applied at a moving speed corresponding to the viscosity of the thermosetting resin solution to be used, so that a film having a constant thickness is always formed. Can do.

(Substep SS1)
In determining the coating speed in step S1, the viscosity of the coating material is measured based on the stirring rotation speed (or frequency) of the coating material and the followability of the magnetic stirrer bar in the stirring solution to the stirring motor. Based on this, the optimum coating speed is determined.

  At this time, the rotation of the magnetic stirrer bar during stirring can be monitored by a rotation sensor, and the stirring rotation speed when the magnetic stirrer bar cannot follow the stirring frequency can be used as an index of viscosity.

(Step S2)
The wire material on which the film is formed in step S1 is put into a heater which is a thermosetting means by the conveying means in a suspended state, and the thermosetting resin of the film formed on the wire material is thermoset. At this time, as the thermosetting condition by the heater, the optimum time and temperature are selected depending on the material of the wire and the material of the coating.

  By step S2, a film having a certain thickness is formed around the wire, but when a film that requires more thickness is formed, the above-described steps S1 and S2 are repeated a plurality of times. A film having a thickness can be formed. In addition, when forming a coating film around a wire, the thickness of the coating film can be further uniformed by changing the position where the coating portion is brought into contact with the position where the coating portion is previously contacted by an arbitrary angle.

  Below, the coating-film production apparatus used for the thin-film coating production method of this invention is demonstrated. FIG. 2 is a schematic explanatory view showing an embodiment of the film forming apparatus of the present invention.

  As shown in FIG. 2, the thin wire film forming apparatus 1 of the present invention includes a holding device 4 that attaches a wire 2 and hangs down, a coating device 5 that forms a film around the wire 2, and a coating material. The agitating device 10 for conveying, a conveying device (not shown) for conveying the wire 2, and a thermosetting device 11 for thermosetting the coating material are controlled by a controller 12 as control means.

  The holding device 4 only needs to have a structure in which a weight 3 is attached to one end of the wire 2 and can be suspended and held. In particular, in the case of a wire having a small diameter, a cylindrical holding portion is provided so as not to cause twisting. A holding device having is desirable. The holding device 4 is transported to the coating device 5 and the thermosetting device 11 under the control of the controller 12 described later.

  The applicator 5 is attached with a brush 6 as an applicator so as to be perpendicular to the wire 2, and the brush 6 is movable in the vertical direction. The moving position and moving speed of the brush 6 are controlled by the controller 12.

The stirrer 10 includes a glass container 7 into which a thermosetting resin solution 8 in which a thermosetting resin as a coating material and a special solvent are mixed, and a magnetic stirrer placed in the thermosetting resin solution 8. It is composed of a bar 9 and a dedicated motor (not shown) for rotating the magnetic stirrer bar 9 to stir the thermosetting resin solution 8, and the dedicated motor is rotated at a rotation speed preset by the controller 12. When the magnetic stirrer bar 9 is rotated, an error occurs in the rotational speed of the magnetic stirrer bar 9 due to a change in viscosity of the thermosetting resin solution 8. The viscosity of the thermosetting resin solution 8 is measured for this error by a rotation sensor (not shown).

The thermosetting device 11 inserts the wire 2 coated with the coating material by the coating device 5 from the upper hole 13 and the controller 12 controls the temperature and time to cure the thermosetting resin as the coating material. Let Note that a shutter part (not shown) for opening and closing the hole 13 is provided on the upper portion of the thermosetting device 11 to hold the wire 2.

  The controller 12 performs the above-described conveyance control of the wire 2, the movement control of the brush 6 of the coating device 5, the moving speed control of the brush 6 from the viscosity value measured by the stirring of the stirring device 10, and the heating control of the thermosetting device 11. The film thickness by the film forming apparatus 1 is controlled to be constant and the desired film thickness is secured.

  In the following, the method for producing a thin wire film according to the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

(Preparation of wire rod)
First, a tungsten wire having a diameter of 40 μm was prepared and cut into 15 cm. Next, a lead plate was cut into an appropriate size and wound around one end side of the tungsten wire, inserted from the distal end side of the injection needle, and the other end side was fixed by a luer lock plug.

(Preparation of coating material)
The epoxy resin solution was put into a glass beaker and diluted under predetermined dilution conditions, and then the magnetic stirrer bar was rotated and stirred. The rotation of the magnetic stirrer bar was monitored with a rotation sensor, and the viscosity was adjusted as necessary.

(Creation of film)
The cap side of the prepared tungsten wire was held by a robot arm and suspended with the weight downward. Next, a brush that can move up and down is immersed in a glass beaker containing the agitated epoxy resin solution to contain an appropriate amount of epoxy resin, and is moved upward by a driving device. Then, the tungsten wire is moved to the brush surface position by the rotation of the robot arm and brought into contact with one circumferential side surface side of the tungsten wire. From this state, the brush was moved at a constant speed downward with the weight. The position where the brush is brought into contact with the tungsten wire, the moving speed of the brush, and the position where the brush is detached from the tungsten wire are determined in advance by the controller. In particular, the moving speed is determined by the measured viscosity value of the thermosetting resin solution, and the robot arm and brush are driven based on the control information.

  After forming a coating of epoxy resin on one side in the circumferential direction of the tungsten wire, the robot arm was rotated again to convey the tungsten wire, and the brush was brought into contact with the other circumferential direction of the tungsten wire. And the brush was moved below similarly to the above, and the coating film of the epoxy resin was formed.

(Heat curing of coating)
The tungsten wire with the coating is moved to the upper part of the thermosetting device by rotating the robot arm. The tungsten wire is inserted from the upper hole of the thermosetting device, and the tungsten wire is held in advance by the shutter. Heat curing was carried out by heating at 100 ° C. for 30 minutes and further heating at 180 ° C. for 30 minutes.

  It was confirmed that the tungsten wire on which the film was formed had an epoxy resin uniformly formed around a metal wire having a diameter of 40 μm. In addition, as a result of repeating application | coating 10 times in the above-mentioned film production, the resin film thickness became 12 micrometers.

(Evaluation of coating)
Using a constant current device that can apply a maximum of 100 V to the tungsten wire, which is the central wire, for the above wire, and using a tester that can measure the leakage current from the thermosetting resin part coated on the surface, Evaluation was performed.

  When operating on the coated tungsten wire using the above device, no leakage current was detected at the location where the epoxy resin coating was formed, and it was confirmed that an insulating coating without pinholes was formed. It was.

  As described above, according to the thin wire film forming method and the thin wire film forming apparatus using the same according to the present invention, the wire is suspended and pulled down with a predetermined force to be formed, and a film is formed around the wire. Adjust to the viscosity of the thermosetting resin, apply the thermosetting resin to the one end in the circumferential direction of the wire with a brush, brush or roller, and move it from top to bottom, and then apply the other end in the circumferential direction of the wire Since the coating is performed while moving from the upper side to the lower side in contact with the side, a film with a constant thickness is always formed without causing defects such as pinholes, even if the wire diameter is 6.5 to 100 μm. it can.

DESCRIPTION OF SYMBOLS 1 Film | membrane production apparatus 2 Wire material 3 Weight 4 Holding apparatus 5 Application | coating apparatus 6 Brush 7 Container 8 Thermosetting resin solution 9 Magnetic stirrer bar 10 Stirring apparatus 11 Thermosetting apparatus 12 Controller 13 Hole

Claims (7)

A method for producing a coating for coating the periphery of a wire, comprising the step of determining a coating position and a coating speed around the wire and applying the coating by a coating means, and applying a coating portion of the coating means to one end in the circumferential direction of the wire A coating is formed around the wire by moving it in the longitudinal direction in contact with the side and further moving the coating part of the coating means in the longitudinal direction from the other direction of the wire. How to make a thin line coating. In the step of determining the application position and the application speed around the wire and applying by the application means, the apparatus further includes a measurement means for measuring the viscosity of the coating material, and based on the viscosity measured by the measurement means, by the control means 2. The method for producing a thin wire film according to claim 1, wherein the coating speed of the coating means is determined. The thin wire film forming method according to claim 1 or 2, wherein the wire is one of metal, plastic, and ceramic, and is a thin wire having a wire diameter of 6.5 to 200 µm. 4. The coating material according to claim 1, wherein the coating material is a thermosetting resin of any one of an epoxy resin, a melamine resin, and a phenol resin, and an application portion of the application means is a brush, a brush, or a roller . The method for producing a thin-wire film according to any one of the above. 5. The method of creating a thin wire film according to claim 4, further comprising a step of thermally curing the film material applied by the applying means . 6. The method for producing a thin wire film according to claim 5 , wherein the step of applying a film material to the heat-cured film material and the step of further heat-curing the film material are repeated a plurality of times. It is a thin wire film production apparatus used for the thin wire film production method as described in any one of Claims 1 thru | or 6, Comprising: Around the wire material whose wire diameter is 6.5-200 micrometers, it is the said wire material by a control means. comprising a coating means for coating to determine the circumference of the coating position and coating speed, the該線material and thermosetting means for thermosetting, one circumferential end of the brush is a part coated with the coating means, the brush or roller the wire By moving it in the longitudinal direction by bringing it into contact with the side and further moving the brush, brush or roller in the longitudinal direction from the other circumferential direction of the wire to form a film, and thermosetting it by thermosetting means An apparatus for producing a thin-wire film, wherein a film is formed around the wire.

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