JP2015131464A - Apparatus and method for applying color line for tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and method for applying a color line for a tire in which, even if a water-soluble ink is used, the interruption of the color line is not caused and the marking can be performed in a uniform width.SOLUTION: An apparatus for applying a color line for a tire includes: a tank with a water-soluble ink stored therein; a pump for pumping the water-soluble ink by an electro-motor; a 3-port solenoid valve having three rotary type valves; a marker pen for ejecting the water-soluble ink and performs marking on a surface of a tire extrudate; and piping for connecting each rotary valve of the tank, the pump and the 3-port solenoid valve, respectively. The apparatus for applying the color line for the tire is provided with control means for switching opening and closing of the rotary type valve of the 3-port solenoid valve so as to form a path where the water-soluble ink is sent in an order of the tank, the pump, the 3-port solenoid valve and the marker pen when performing the marking, and alternatively, when not performing the marking, so as to form the path where the water-soluble ink circulates in an order of the tank, the pump, the 3-port solenoid valve and the tank.

Description

  The present invention relates to a tire color line coating apparatus and a tire color line coating apparatus for marking a color line on a surface of a tire extrudate extruded from an extruder for identifying a material such as an applied tire and an applied size. The present invention relates to a tire color line coating method used.

  In the tire manufacturing process, a tire color line applicator (hereinafter also simply referred to as “color line applicator”) is used to carry out tire extrusion while conveying a tire extrudate such as tread rubber extruded from a molding machine. Generally, a color line (center line) for identification is continuously marked on a surface of an object with a color ink (hereinafter also simply referred to as “ink”) using a marker pen (for example, Patent Document 1).

  Conventionally, this marking is performed using a color line coating apparatus 41 as shown in FIG. 4 using an ink obtained by dissolving colored rubber in an organic solvent such as naphtha.

  Specifically, the color line coating device 41 supplies ink from the tank 42 by its own weight through the pipe 60 to the marker pen 50 disposed below the tank 42 in which the ink is stored. The ink is ejected from the tire and applied to the surface of the tire extrudate T, whereby the color line CL is marked. An air motor and a propeller (not shown) for stirring the stored ink are disposed inside the tank 42. Further, instead of supplying ink by its own weight, ink may be supplied by air pressure feeding.

JP 2012-158120 A

  However, since the ink that has been used conventionally uses an organic solvent such as naphtha as a solvent as described above, there is a concern that the volatile organic solvent may adversely affect the human body. Moreover, since the organic solvent is a flammable combustible material, the use of fire has been limited in the vicinity of the ink.

  Therefore, introduction of water-soluble ink using water as a solvent has been studied. However, when a conventional color line coating apparatus is used as it is, the color line is interrupted and marking is performed with a uniform width. There was a problem that I could not.

  Therefore, the present invention uses a tire color line coating apparatus and a tire color line coating apparatus capable of marking with a uniform width without causing color line interruption even when water-soluble ink is used. Another object of the present invention is to provide a tire color line coating method.

The invention described in claim 1
A tire color line coating apparatus for marking a color line on the surface of a tire extrudate,
A tank in which water-soluble ink is stored;
A pump for pressure-transporting the water-soluble ink by an electric motor;
A three-port solenoid valve having three rotary valves;
A marker pen that discharges the water-soluble ink from the tip and marks the color line on the surface of the tire extrudate;
A pipe connecting the tank and the pump, and each rotary valve of the three-port solenoid valve and a pipe connecting each of the tank, the pump, and the marker pen,
When marking is performed, a path through which the water-soluble ink is sent in the order of the tank, the pump, the three-port solenoid valve, and the marker pen is formed. When marking is not performed, the tank, the pump, and the three-port solenoid Color line coating for tires, characterized in that a control means for switching opening and closing of the rotary valve of the three-port solenoid valve is provided so as to form a path through which the water-soluble ink circulates in the order of the valve and the tank. Device.

The invention described in claim 2
2. The tire color line coating apparatus according to claim 1, wherein an inner diameter of each connection portion of the pipe is set to 50 to 150% with respect to an inner diameter of a non-connection portion.

The invention according to claim 3
3. The tire color line coating apparatus according to claim 1, wherein a diameter of a discharge port of the marker pen is φ0.5 to 1.5 mm.

The invention according to claim 4
The marker pen is suspended so as to be movable by a suspension member and / or the pipe, and when marking, it is arranged so that the marking can be performed movably with the tip portion lowered. The tire color line coating apparatus according to any one of claims 1 to 3.

The invention described in claim 5
The marker pen is
The torso,
A distal end portion connected to the distal end side of the body portion;
An ejection port that is provided at the tip of the tip and ejects the water-soluble ink;
Having an inside of the body part, an inside of the tip part, and a through hole communicating with the discharge port;
The through hole is formed in a tapered shape that tapers toward the discharge port at the tip portion,
5. The diameter of the through hole on the distal end side of the body portion is substantially equal to the diameter of the through hole on the body portion side of the distal end portion. The color line coating apparatus for tires described in 1.

The invention described in claim 6
A tire color line coating method for marking a color line on the surface of the tire extrudate using the tire color line coating apparatus according to any one of claims 1 to 5,
The water-soluble ink stored in the tank is conveyed by pressure by the electric motor of the pump,
When marking is performed by switching the opening and closing of the rotary valve of the three-port solenoid valve, the water-soluble ink is sent in the order of the tank, the pump, the three-port solenoid valve, and the marker pen to the surface of the tire extrudate. A color line coating method for tires, wherein the water-soluble ink is circulated in the order of the tank, the pump, the 3-port solenoid valve, and the tank when marking is performed on the color line. .

The invention described in claim 7
7. The tire color line coating method according to claim 6, wherein an angle of the marker pen with respect to a surface of the tire extrudate is set to 30 to 45 °, and color line marking is performed.

  According to the present invention, even when a water-soluble ink is used, the color line is not interrupted and the tire color line coating apparatus and the tire color line coating apparatus capable of marking with a uniform width are used. It is possible to provide a color line coating method for tires.

1 is a schematic configuration diagram showing a tire color line coating apparatus according to an embodiment of the present invention. It is a longitudinal cross-sectional view which shows an example of the marker pen in FIG. It is a figure which shows a mode that marking is given in one embodiment of this invention. It is a schematic block diagram which shows the conventional color line coating apparatus for tires. It is a longitudinal cross-sectional view which shows the marker pen in the conventional color line coating apparatus for tires.

  Hereinafter, the present invention will be described based on embodiments with reference to the drawings.

1. Problems in the conventional color line coating apparatus Before describing the present embodiment, there are problems in using the conventional color line coating apparatus when marking the surface of the tire extrudate using water-soluble ink. explain.

  As described above, in the conventional color line coating apparatus as shown in FIG. 4, a propeller for stirring is disposed in the tank, and ink is supplied to the marker pen by its own weight or air pressure.

  When water-soluble ink is stored in such a tank, air (bubbles) enters the ink by the rotation of the propeller and is supplied to the marker pen as it is. The width cannot be marked.

  In addition, since water-soluble ink tends to separate and precipitate, the viscosity increases in the pipes leading to the marker pen, leading to a decrease in the ink flow rate and the occurrence of color line breaks.

  Furthermore, when water-soluble ink is supplied by air pressure feeding, the discharge pressure changes depending on the height of the ink surface in the tank, which causes a change in the ink flow rate and the occurrence of color line breaks.

2. Therefore, in this embodiment, a color line coating apparatus as shown in FIG. 1 is used. FIG. 1 is a schematic configuration diagram showing a color line coating apparatus according to the present embodiment. As shown in FIG. 1, the color line coating apparatus 1 according to the present embodiment includes a tank 2, a small pump 4, a three-port electromagnetic valve 8, a marker pen 10, and pipes 20 to 23.

  Water-soluble ink is stored inside the tank 2, and the water-soluble ink is transferred to the small pump 4 through a pipe 20 connected from the outlet 2 b of the tank 2 to the inlet 4 a of the small pump 4. Supplied.

  The small pump 4 is configured to connect the water-soluble ink supplied from the tank 2 via the pipe 20 to the inlet 21a of the three-port solenoid valve 8 from the outlet 4b of the small pump 4 and the three-port electromagnetic. The pressure is conveyed from the second outlet 8 c of the valve 8 to the marker pen 10 through the pipe 23 connected to the inlet 10 a of the marker pen 10.

  At this time, in the present embodiment, a small pump capable of pressure-conveying water-soluble ink by an electric motor is used as the small pump 4. That is, in the case of an ink using a conventional organic solvent, the use of fire is limited in the vicinity of the ink, and it is difficult to use an electric motor, but in this embodiment, water-soluble ink is used. Because it is used, there is no danger of ignition even if an electric motor is used. Then, by using the electric motor to convey the pressure of the ink, the occurrence of pulsation is suppressed, and even when water-soluble ink is used, a stable flow rate is secured and the ink is supplied to the marker pen 10. be able to.

  The small pump 4 is preferably a variable capacity small pump from the viewpoint that the flow rate can be easily adjusted.

  The three-port solenoid valve 8 is provided with three rotary valves (ball valves) as switching valves. The first valve is connected to the pipe 21 at the inlet 8a of the three-port solenoid valve 8, and two The second valve is connected to the pipe 22 connected to the inlet 2a of the tank 2 at the first outlet 8b, and the remaining third valve is connected to the marker pen 10 at the second outlet 8c as described above. It is connected to a pipe 23 connected to the inlet 10a. And it is comprised so that the water-soluble ink supplied via the inflow port 8a of the 3 port solenoid valve 8 can be supplied to either of the piping 22 and 23 by rotation of a switching valve.

  Here, as the switching valve of the three-port solenoid valve 8, there is also a direct-acting switching valve, but in the case of the direct-acting switching valve, a slight amount of ink adheres between the valve body and the valve seat. For this reason, the valves cannot be completely sealed when used for a long time. For this reason, in this Embodiment, a rotary valve is used as a switching valve. Of the rotary valves, an electric ball valve is preferably used from the viewpoint of easy switching.

  The marker pen 10 supplies water-soluble ink supplied from the tank 2 via the pipes 20, 21, and 23 through the inlet 8 a and the second outlet 8 c of the small pump 4 and the three-port solenoid valve 8 from the tip. The color line CL is marked on the surface of the tire extrudate T by discharging.

  At this time, since the water-soluble ink is supplied to the marker pen 10 by using the small pump 4 that conveys the pressure of the ink by the electric motor, the discharge pressure does not change depending on the height of the ink liquid level in the tank 2. Marking can be performed by supplying ink at a stable flow rate. In addition, the tank 2 can be installed at a position lower than the marker pen 10, and the degree of freedom for installing the tank 2 is increased.

  In the present embodiment, as described above, the supply destination of the water-soluble ink can be changed by the rotation of the switching valve (rotary valve) of the three-port solenoid valve 8.

  That is, when marking is performed, the first outlet 8b of the three-port solenoid valve 8 is closed and the second outlet 8c is opened, so that the tank 2, the small size, as indicated by arrows F1 and F2 in FIG. A path through which water-soluble ink is sent is formed in the order of the pump 4, the three-port solenoid valve 8, and the marker pen 10, and the water-soluble ink is discharged from the tip of the marker pen 10. At this time, since the small pump 4 pressure-transports the water-soluble ink by the electric motor as described above, the generated pulsation is small and the water-soluble ink can be supplied stably. As a result, uniform marking can be performed without causing the color line CL to be interrupted.

  On the other hand, when marking is not performed, by closing the second outlet 8c of the three-port solenoid valve 8 and opening the first outlet 8b, as shown by arrows F1 and F3 in FIG. A path through which water-soluble ink is sent is formed in the order of the small pump 4, the 3-port solenoid valve 8, and the tank 2, and the water-soluble ink circulates. Thus, since water-soluble ink circulates without marking, the water-soluble ink is properly stirred without providing a propeller for stirring in the tank 2 and prevents bubbles from entering due to the rotation of the propeller. can do. In addition, it is possible to suppress the precipitation of the ink, and it is possible to prevent the viscosity from increasing in the pipe leading to the marker pen 10 and the ink flow rate from being decreased, and to perform uniform marking without causing the color line to be interrupted. Can be applied.

  The water-soluble ink used in the present embodiment preferably has a viscosity of 20 to 100 mPa · s. Examples of such a water-soluble ink include 1 to 20% wt titanium dioxide, 1 to An ink (viscosity: about 60 mPa.multidot.) Diluted by adding the same amount of water to a stock solution having a viscosity of 800 to 900 Pa.s containing 3% wt. Ethoxynonylphenol and less than 3% wt. Amorphous silica. s).

  The ink flow rate required for marking is usually as small as about 5 ml / min in consideration of the state (width and discontinuity) of the formed color line CL and the dried state after application. For this reason, if the inner diameter is suddenly expanded in each of the pipes 20, 21, 22, and 23, the ink tends to stagnate there. Since the stagnant ink is likely to settle, the color line CL is interrupted by solidifying at that point. For this reason, the inner diameter in the connection part (location connected with another pipe) of each pipe whose inner diameter tends to change is 50 to 150% with respect to the inner diameter in the non-connection part (location excluding the connection part). It is preferable to set it so that the inner diameter change in the connecting portion is suppressed as much as possible.

3. Marker Pen The present inventor further examined the structure of the marker pen in the above-described color line coating apparatus. Hereinafter, this marker pen will be described in detail.

  FIG. 2 is a longitudinal sectional view showing an example of a marker pen in the color line coating apparatus shown in FIG. As shown in FIG. 2, the marker pen 10 has a cylindrical body portion 12 having a through hole 13 and a distal end portion 14 attached to the distal end side of the body portion 12. Water-soluble ink is supplied to the through hole 13 of the body portion 12 via a pipe 23 (see FIG. 1).

  The tip portion 14 of the marker pen 10 is formed in a taper shape, and a circular discharge port 16 for discharging water-soluble ink supplied to the through hole 13 to the surface of the tire extrudate T is formed at the tip. .

  The through hole 13 is formed in a tapered shape that tapers toward the discharge port 16 at the distal end portion 14, and the diameter of the through hole 13 is the distal end portion 14 side of the trunk portion 12 and the trunk portion 12 side of the distal end portion 14. And so as to be substantially equal.

  That is, in the marker pen 10 of the present embodiment, the through hole 13 in the distal end portion 14 and the through hole 13 in the body portion 12 communicate with each other with the same diameter, and the through hole 13 faces the discharge port 16 in the distal end portion 14. It differs from the conventional marker pen 50 as shown in FIG. 5A in that it is formed in a tapered shape that is tapered.

  In the case of the conventional marker pen 50 shown in FIG. 5A, since the conical cavity 55 larger than the inner diameter of the through hole 53 of the body portion 52 is formed inside the tip portion 54, the inner diameter changes greatly. It was easy for the ink to stay in the staying portion 57. The tip 54 is in a high temperature (about 100 ° C.) because it is in contact with the tire extrudate T that is extruded and conveyed at a high temperature. As a result, there is a possibility that the ink staying in the staying portion 57 is solidified and clogs the ejection port 56 and the color line CL is interrupted.

  Therefore, as an improved type, as shown in FIG. 5B, while the diameter of the conical cavity 55 is made smaller than the conventional one, the marker pen 50A in which a small stay portion 57A is left in consideration of ease of processing. Was considered. However, even with this improved marker pen 50A, there is still a possibility that the ink stays in the small staying portion 57A, so that it cannot be said to be sufficient for solving the problem that the ejection port 56 is clogged.

  On the other hand, in the marker pen 10 in the present embodiment, the through hole 13 in the distal end portion 14 and the through hole 13 in the body portion 12 communicate with each other with the same diameter, and the inner diameter of the through hole 13 does not change significantly. The portion where the ink stays is not formed, and the ink does not solidify. As a result, it is possible to sufficiently reduce the occurrence of a problem that the ejection port 56 is clogged with the solidified ink.

  In addition, as a diameter of the discharge port 16 of the marker pen 10, it is preferable that it is 0.5-1.5 mm, and it is especially preferable that it is 1.0 mm. If the diameter is too small, the discharge port 16 is likely to be clogged, and if it is too large, the amount of ink discharged becomes too large and the drying of the ink after marking is delayed.

  Further, the material of the marker pen 10 is preferably a hard metal that does not rust easily and does not generate friction even when water-soluble ink is used, and examples thereof include stainless steel, nitride alloy, and platinum. As a specific example, the marker pen 10 which consists of the front-end | tip part 14 of SUS420J2 and the trunk | drum 12 of SUS304 is mentioned.

  Also, when marking a color line using a marker pen, conventionally, the tip of the marker pen is fixed in a state of being inserted into a line groove (V groove) on the surface of the tire extrudate T, and ink is ejected from the marker pen. Was. For this reason, if meandering or vertical movement occurs in the tire extrudate being conveyed, the tip of the fixed marker pen may deviate from the line groove and cannot follow, and a meandering color line may be formed.

  On the other hand, in the tire color line coating apparatus according to the present embodiment, as shown in FIG. 3, the marker pen 10 is centered on the tire extrudate T by the chains 30 a to 30 c and the pipes 23 that are suspension members. On the line, it is suspended so that the front-end | tip part 14 may fall.

  Thereby, even if meandering and vertical movement occur in the tire extrudate T being conveyed, the tip end portion 14 of the marker pen 10 that is movably suspended does not come off the line groove, and the tire extrudate An appropriate color line CL can be marked on the surface of T along the line groove. In addition, it is preferable that the angle (alpha) of the marker pen 10 with respect to the surface of the tire extrudate T at this time is 30-45 degrees.

  As described above, according to the present embodiment, it is possible to solve various problems that occur when water-soluble ink is used in the conventional color line coating apparatus for tires. The color lines can be marked in a uniform width without interruption.

(Example)
Using the tire color line coating apparatus according to the above embodiment, a water-soluble ink was applied to the surface of the extruded tread rubber to mark the center line. As the ink, the water-soluble ink described above, that is, a water-soluble ink having a viscosity of 60 mPa · s obtained by diluting a stock solution having a viscosity of 800 to 900 Pa · s 1: 1 with water was used.

  The total length of the marker pen is 226 mm, the length of the body of the marker pen is 200 mm, and the length of the tip is 26 mm. And the internal diameter of the through-hole of a trunk | drum is 6 mm, and the through-hole of the front-end | tip part is formed in the taper shape which tapes off from an internal diameter 6mm to 1mm toward a discharge port.

The detailed conditions are as follows.
Tank capacity: 4L
Pump: manufactured by Nitto Kohki Co., Ltd., Bimol Pump (BPS-215i)
Ink flow rate: 5 ml / min
Solenoid valve: Electric ball valve 3 port valve (MHG4-10-25) manufactured by CKD
Piping: inner diameter 4mm, outer diameter 6mm,

(Comparative Example 1)
Using a conventional tire color line coating apparatus as shown in FIG. 4, the water-soluble ink in the tank was supplied to the marker pen by its own weight to mark the center line on the surface of the tire extrudate.

  Note that the marker pen shown in FIG. 5A was used as the marker pen. Specifically, the overall length, the length of the body portion, the length of the tip portion, and the inner diameter of the through hole of the body portion are the same as in the embodiment, and the tip portion tapers from 15 mm to 1 mm in the inner diameter toward the discharge port. A marker pen in which a conical cavity was formed was used.

(Comparative Example 2)
A centerline marking was applied to the surface of the tire extrudate under the same conditions as in Comparative Example 1 except that the marker pen shown in FIG.

  Specifically, the overall length, the length of the body portion, the length of the tip portion, and the inner diameter of the through hole of the body portion are the same as in the embodiment, and the tip portion tapers from 6 mm to 1 mm in the inner diameter toward the discharge port. A marker pen was used in which a conical cavity was formed, but a stay portion having a length of 0.5 mm and an inner diameter of 15 mm was formed between the tip portion and the body portion.

(result)
In the examples, even if water-soluble ink was used, the center line could be marked with a uniform width, and appearance defects such as line breakage were not observed.

  On the other hand, in Comparative Examples 1 and 2, with the height of the ink liquid level in the tank, the ink flow rate changed and the discharge amount changed, and the center line was interrupted. In Comparative Examples 1 and 2, the same result was obtained even when the self-weight conveyance was switched to air pressure feeding.

  In Comparative Examples 1 and 2, air (bubbles) entered the ink by propeller agitation and the color line was interrupted. When the agitation was stopped, the ink component of the water-soluble ink in the tank was precipitated.

  In addition, at the tip of the marker pens of Comparative Examples 1 and 2, there was a problem that ink solidified in the staying portion and the discharge port was clogged. On the other hand, no ink solidification occurred at the tip of the marker pen of the example without the staying portion, and marking could be performed stably for a long time.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

1, 41 (For tire) Color line coating device 2, 42 Tank 2a Tank inlet 2b Tank outlet 4 Small pump 4a Small pump inlet 4b Small pump outlet 8 3-port solenoid valve 8a 3-port solenoid valve Inlet 8b First outlet of 3-port solenoid valve 8c Second outlet of 3-port solenoid valve 10, 50, 50A Marker pen 10a Marker pen inlet 12, 52 Body 13, 53 Through hole 14, 54 Tip 16 , 56 Discharge port 20-23, 60 Piping 30a-30c Chain 55 Conical cavity 57, 57A Residence part T Tire extrudate CL Color line α Angle formed between the tire extrudate and the marker pen

Claims (7)

A tire color line coating apparatus for marking a color line on the surface of a tire extrudate,
A tank in which water-soluble ink is stored;
A pump for pressure-transporting the water-soluble ink by an electric motor;
A three-port solenoid valve having three rotary valves;
A marker pen that discharges the water-soluble ink from the tip and marks the color line on the surface of the tire extrudate;
A pipe connecting the tank and the pump, and each rotary valve of the three-port solenoid valve and a pipe connecting each of the tank, the pump, and the marker pen,
When marking is performed, a path through which the water-soluble ink is sent in the order of the tank, the pump, the three-port solenoid valve, and the marker pen is formed. When marking is not performed, the tank, the pump, and the three-port solenoid Color line coating for tires, characterized in that a control means for switching opening and closing of the rotary valve of the three-port solenoid valve is provided so as to form a path through which the water-soluble ink circulates in the order of the valve and the tank. apparatus.   2. The tire color line coating apparatus according to claim 1, wherein an inner diameter of each connection portion of the pipe is set to 50 to 150% with respect to an inner diameter of a non-connection portion.   3. The tire color line coating apparatus according to claim 1, wherein a diameter of the discharge port of the marker pen is φ0.5 to 1.5 mm.   The marker pen is suspended so as to be movable by a suspension member and / or the pipe, and when marking, it is arranged so that the marking can be performed movably with the tip portion lowered. The tire color line coating apparatus according to any one of claims 1 to 3, wherein: The marker pen is
The torso,
A distal end portion connected to the distal end side of the body portion;
An ejection port that is provided at the tip of the tip and ejects the water-soluble ink;
Having an inside of the body part, an inside of the tip part, and a through hole communicating with the discharge port;
The through hole is formed in a tapered shape that tapers toward the discharge port at the tip portion,
5. The diameter of the through hole on the distal end side of the body portion is substantially equal to the diameter of the through hole on the body portion side of the distal end portion. The color line coating apparatus for tires described in 1. A tire color line coating method for marking a color line on the surface of the tire extrudate using the tire color line coating apparatus according to any one of claims 1 to 5,
The water-soluble ink stored in the tank is conveyed by pressure by the electric motor of the pump,
When marking is performed by switching the opening and closing of the rotary valve of the three-port solenoid valve, the water-soluble ink is sent in the order of the tank, the pump, the three-port solenoid valve, and the marker pen to the surface of the tire extrudate. A color line coating method for tires, wherein the water-soluble ink is circulated in the order of the tank, the pump, the 3-port solenoid valve, and the tank when the color line is marked on the tank.   7. The tire color line coating method according to claim 6, wherein an angle of the marker pen with respect to a surface of the tire extrudate is set to 30 to 45 [deg.] To perform color line marking.

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