JPH08339539A - Method for supplying magnetic coating material and device therefor - Google Patents

Abstract

PURPOSE: To obtain a method for supplying a magnetic coating material capable of continuously charging a slight amt. of additives to the magnetic coating material flowing under a prescribed pressure in a piping, and a device therefor. CONSTITUTION: The magnetic coating material supplied upper a prescribed pressure and the flow rate of this magnetic coating material are detected by a flow meter 41. By the pressure higher than the pressure described above obtd. by a supply pump 23 constituted of a plunger pump and a pressure regulating valve 24 according to this flow rate, the coating material and the additives are charged into a line mixer 30 and are stirred. The magnetic coating material containing the additives added is then supplied to a die head 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for supplying a magnetic coating material, and more particularly, to a magnetic coating material which is agitated with additives such as a curing agent and a lubricant used for producing a coating type magnetic recording medium. The present invention relates to a magnetic paint supply method and apparatus for supplying magnetic paint to a coating device.

[0002]

2. Description of the Related Art In the manufacturing process of a coating type magnetic recording medium, a flexible tape wound with a predetermined tension and speed from a roll wound with a long flexible strip made of a plastic film such as polyethylene terephthalate. There is a coating step of coating a magnetic coating material on the surface of a strip by an extrusion coating method, and a method for adding an additive to the magnetic coating material in the coating apparatus used so far in the coating step and the apparatus thereof will be described with reference to FIG. explain.

FIG. 6 is a conceptual diagram showing a magnetic paint supply device in the prior art. Addition of additives to magnetic paint
Normally, the magnetic paint supply device 100 shown in FIG. 6 is used. This magnetic paint supply device 100 has 10 to 1
An additive mixing tank (hereinafter, simply referred to as “mixing tank”) 101 having a capacity of about 00 liters is provided, and the magnetic paint is supplied and accommodated in the mixing tank 101 from a storage tank (not shown). On the other hand, the additive contained in the additive stock tank 102 is supplied with a gear type supply pump (hereinafter simply referred to as “gear pump”) 10
3, the additive stock tank 10 through the pipe 104
It is configured to supply two. Reference numeral 105 indicates a flow meter of the additive to be supplied, and reference numeral 106 indicates an opening / closing valve. The magnetic paint and the additive are supplied by a batch management method in which the magnetic paint in the mixing tank 101 is replenished at a predetermined ratio at a predetermined ratio for each type of magnetic recording medium to be manufactured. Is supplied and thrown in, and the stirring process is performed by the stirring device 108 that is rotationally driven by the motor 107.

Further, the magnetic paint in which the additive is added in a predetermined ratio is connected to the pipe 110 and the pipe 1 by the gear pump 109.
It is configured to be circulated to the mixing tank 101 through 11. Reference numeral 112 indicates a filter. This circulation piping system is a piping line for further stirring the magnetic paint after circulating the magnetic paint after supplementing the magnetic paint with the additive.

The gear pump 109 filters the filter 11
The magnetic coating material supplied with a predetermined amount of additive supplied through 2 is further supplied to the die head 116 through the filter 115 through the pipe 114 through the pipe 114 with a certain amount of the magnetic coating material by the high precision gear pump 113, and the flexible coating. It is configured to be applied to the surface of the material band.

As shown in FIG. 7A, the gear pump usually has a pair of gears 121 and 122, which are meshed with each other, built in the main body 120 of the housing, and one gear, for example, the shaft 123 of the gear 122. When a motor (not shown) is connected and the gear 121 is rotated, the other gear 121 meshed with the gear 122 is rotated, and the gear 121 is rotated.
The liquid (magnetic paint in this embodiment) introduced from the introduction pipe 124 by the rotation of the casing main body 1 as shown in FIG. 7B in which a part of the gear pump is enlarged.
20A inner peripheral surface 120A and gear 121 outer peripheral teeth 121A
A certain amount of the magnetic paint determined by the space of the distance D is discharged from the discharge pipe 125 which is led out to the opposite side of the housing body 120 from the introduction pipe 124. The amount of the derived magnetic paint is determined not only by the space D but also by the fineness of the teeth of the teeth 121A.

[0007]

The above-mentioned magnetic paint supply device 100 uses a batch processing system.
In this batch processing method, since the magnetic paint and the additive are replenished every time the fixed amount, the magnetic paint decreases, in order to perform the stirring while circulating the magnetic paint through the circulation piping system after the replenishment, Mixing tank 1 of constant volume as described above
01 must be used. As described above, in the batch processing method, since the mixing tank 101 is present, it takes several minutes to 20 minutes from the addition of the additive and the stirring to the coating, depending on the capacity of the mixing tank 101. During this period, the magnetic coating material stays in the mixing tank 101. If the residence time is long, the reaction between the magnetic coating material and the additive is promoted, and the magnetic coating material agglomerates. It causes out.

Further, since the residence time until the application of the magnetic paint is long, it is not possible to use a highly reactive crosslinking agent and the like, so that the durability of the magnetic recording medium cannot be increased and its quality is improved. It is also a constraint in doing. Furthermore, due to the performance of the gear pump, it is impossible to accurately supply a very small amount of additive. The present invention
It is an object to solve such problems, in which a small amount of additives such as a curing agent and a lubricant is added to the magnetic paint flowing in the pipe under a predetermined pressure, and the mixture is stirred. An object of the present invention is to obtain a magnetic paint supply device that can supply a coating device such as a die head.

[0009]

Therefore, in the method for supplying a magnetic paint according to the present invention, a pressure higher than the above pressure is applied to the magnetic paint supplied under a predetermined pressure in accordance with the flow rate of the magnetic paint. However, the above problem was solved by adopting a method of constantly adding an additive and stirring.

As a supply device for carrying out the method of supplying magnetic paint, a magnetic paint supply source, an additive supply source, a magnetic paint supply pump connected to the magnetic paint supply source through a pipe, and a magnetic material The above problem is solved by a flowmeter for paint, an additive supply pump connected to the additive supply source through a pipe, an additive flowmeter and a pressure adjusting valve.

[0011]

Therefore, it was not possible to add the additive to the magnetic paint being supplied so far. However, if the method and the apparatus for supplying the magnetic paint of the present invention are adopted, the additive is always added to the magnetic paint. In addition to the conventional technology, a tank for stirring magnetic paint is no longer required, and a curing system for accelerating the reaction between the magnetic paint and the additives is no longer required. The supply process can be greatly simplified.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the magnetic paint supply method and apparatus of the present invention will be described with reference to FIGS. FIG. 1 is a conceptual diagram of a magnetic paint supply method and an apparatus therefor according to an embodiment of the present invention, and FIG. 2 is a block diagram of an additive injection control control for the magnetic paint in the magnetic paint supply device shown in FIG. 3 is a flow chart for controlling the additive addition to the magnetic paint shown in FIG. 2, and FIG. 4 is a plunger pump used as an additive supply pump in the magnetic paint supply device shown in FIG. FIG. 5 is a conceptual cross-sectional view of FIG. 5, and FIG. 5 is a conceptual cross-sectional view of the line mixer in the magnetic paint supply device shown in FIG. 1.

In FIG. 1, reference numeral 1 indicates a magnetic paint supply device 1 of the present invention. This magnetic paint supply device 1
Broadly classified, magnetic paint supply system 10 and additive supply system 20
And an additive injection control system 40. The magnetic paint supply system 10 includes a storage tank 11 that stores magnetic paint, a supply pump 13 that is a high-precision gear pump that is connected to a pipe 12A that is led out from the bottom of the storage tank 11, and the supply pump. The filter 14 is connected to the output side of the filter 13 through the pipe 12B, and the output side of the filter 14 is connected to the pipe 12C.
Through the line mixer 30. Also,
A flow meter (hereinafter simply referred to as “flow meter”) 41 for measuring the amount of supplied magnetic paint is connected to an intermediate portion of the pipe 12B. The supply pump 13 is, for example, 50 to 1 per minute.
It has the ability to supply magnetic paint in a flow rate range of 600 cc.

On the other hand, the additive supply system 20 is a triple plunger pump connected to an additive stock tank 21 in which the additive is stored and a pipe 22A led out from the bottom of the additive stock tank 21. It is composed of a certain additive supply pump 23 and a pressure adjusting valve 24 connected to the output side of this additive supplying pump 23 through a pipe 22B. The output side of this pressure adjusting valve 24 is a pipe 22C.
Through the line mixer 30. Also,
A flow meter (hereinafter simply referred to as “flow meter”) 42 for measuring an additive supply amount is connected to an intermediate portion of the pipe 22B. The additive supply pump 23 has a capability of supplying the additive in a flow rate range of 1 to 30 cc per minute, for example.

A pipe 3 is provided at the outlet of the line mixer 30.
A filter 32 is connected via 1A, and the die head 3 is connected to the outlet side of the filter 32 via a pipe 31B.
3 is connected. The additive injection control system 40 is provided with a controller 43. The controller 43 is provided with data on the flow rate of the magnetic paint detected by the flow meter 41, and from the flow meter 42 with the flow meter 42. The data of the flow rate of the magnetic paint detected in
The control signal generated based on these data is transmitted to the servo amplifier 44 connected to the output side of the controller 43.
It is configured to control the amount of the additive that is applied to the additive coating pump 23 through the above and is added to the magnetic coating material by the line mixer 30.

Next, the operation of the magnetic paint supply device 1 of the present invention thus constructed will be described. In the magnetic paint supply device 1 of the present invention, the magnetic paint stored in the storage tank 11 is constantly agitated by the agitator 11A rotated by the motor M. The agitated magnetic paint is supplied to the line mixer 30 from the storage tank 11 through the filter 14 by operating the supply pump 13. Further, by operating the additive supply pump 23, the additive is supplied from the additive stock tank 21 to the line mixer 30 via the pressure adjusting valve 24, and as described later with reference to FIG. Additives are always added to the magnetic coating material supplied at 30 and stirred. The magnetic paint containing the additive is passed through the filter 32 to the die head 3
3 and is applied to the surface of the flexible strip passing through the die head 33 by the extrusion method.

In the line mixer 30, the amount of the additive added to the supplied magnetic paint is controlled by the controller 43. Next, the operation of the controller 43 will be described with reference to FIGS. First,
By using the additive addition amount setting digital switch 51 provided in the operation panel 50, an arbitrary addition amount of additive per 100 cc of magnetic paint flow rate is set in advance according to the magnetic characteristics of the magnetic recording medium to be manufactured. . An arbitrary value of the additive amount setting data is set to (N). The additive input amount setting digital switch 51 is, for example, 1 to 30 cc.
It can be set in the range of. Then, the magnetic paint supply device 1 is started. Then, the magnetic paint is supplied from the storage tank 11 of the magnetic paint supply system 10 to the pipe 1
The flow rate of the magnetic paint that begins to flow through 2A and 12B is detected by the flow meter 41, and the flow rate (Q) of the magnetic paint is detected.
It is input to the controller 43.

The flow rate (Q) of the magnetic paint and the additive addition amount setting data (N) are calculated by the additive addition amount calculation device 45.
The additive supply amount proportional to the flow rate (Q) of the magnetic paint is calculated by the calculation formula of [Equation 1], and the set value (AV) is determined.

[0019]

[Equation 1]

Next, feedback of the additive flow rate (F /
(Abbreviated as B) and magnetic paint proportional PID control will be described.
The comparator 46 compares the additive injection amount measurement data (PV) from the flow meter 42 with the set value (AV), and the PID calculation device 47 performs PID calculation based on the difference (deviation), and controls it. The output (MV) is applied to the servo amplifier 44, and the output of the servo amplifier 44 causes the additive supply pump 23 to operate.
Is controlled to control the flow rate of the additive to the line mixer 30, that is, the amount of additive added.

By the way, the additive supply pump 23 receives a control output (MV) from the controller 43 to supply a predetermined amount of additive, but the supply pressure of the additive flowing in the pipe 22C supplies the magnetic paint. If the pressure is lower than the pressure, there arises a problem that the magnetic paint flows back to the discharge port side of the additive supply pump 23. A check valve may be used as a measure to prevent the backflow of the magnetic paint. However, due to the structure of the additive supply pump 23, which will be described later, it is better to apply a certain load to the discharge port side of the additive. Since it has been confirmed by experiments that the supply of the additive can be stabilized, in the present invention, the pressure adjusting valve 24 is used to stably supply an extremely small amount of the additive.

The additive supply pump 23 is, for example,
It is a triple plunger pump made by Fuji Machine Co., Ltd. As shown in FIG. 4, the plunger pump 23A includes a cylinder 2301, a piston 2302 that is mounted inside the cylinder 2301, and performs a piston movement, and the piston 232.
02 is constantly pulled downward from the lower end of the cylinder 2301 in FIG.
3, an eccentric cam 2304 arranged so as to abut the lower end of the piston 2302, and openings on both side surfaces at the upper end, and the pipes 22A and 22B are provided at these openings.
Are configured so that they can be connected to each other. Therefore, as the eccentric cam 2304 rotates, the piston 2302 moves up and down, and the pipe 2 is moved according to the degree of the up and down movement.
The additive supplied from 2A is discharged from the pipe 22B,
It can be supplied. In an embodiment of the present invention,
By connecting three plunger pumps 23A having such a structure and shifting the phases of the respective piston movements, the additive can always flow smoothly.

As shown in FIG. 5, the line mixer 30 includes a plurality of stirring plates 3003 inside a cylinder 3001 at equal intervals in the longitudinal direction of a rotary shaft 3002 supported coaxially with the cylinder 3001. The magnetic paint supplied from the pipe 12C and the additive added from the pipe 22C are fixed and the cylinder 3 is rotated by rotating the rotary shaft 3002.
001 has a structure in which it is kneaded in a small gap on the inner surface and uniformly mixed, and the magnetic paint mixed with this additive is supplied to the filter 32 through a pipe 31A.

[0024]

As described above, according to the magnetic paint supply device of the present invention, it is possible to constantly and stably add even a trace amount of additive to the magnetic paint continuously supplied in the pipe. Is now possible. Therefore, the quality of the magnetic recording medium, particularly the durability, can be improved, and a curing system for accelerating the reaction between the magnetic paint and the additive is not required, and the process can be simplified. Further, a tank for mixing the additives of the magnetic paint is not necessary, and the loss of the magnetic paint remaining in the pipe can be reduced. Above all, the degree of freedom in the process can be expanded by extending the pot life, and the system configuration can be simplified, so that the degree of freedom in installing the magnetic paint supply device can be increased, which further reduces the cost of the magnetic paint supply device. You can also

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a magnetic paint supply method and an apparatus therefor according to an embodiment of the present invention.

FIG. 2 is a block diagram of an additive injection control to the magnetic paint in the magnetic paint supply device shown in FIG.

FIG. 3 is a flow chart for controlling the addition of additives to the magnetic paint shown in FIG.

FIG. 4 is a conceptual cross-sectional view of a plunger pump used as an additive supply pump in the magnetic paint supply device of the present invention.

FIG. 5 is a conceptual cross-sectional view of a line mixer in the magnetic paint supply device of the present invention.

FIG. 6 is a conceptual diagram showing a magnetic paint supply device in the prior art.

7A and 7B show the structure of a gear pump. FIG. 7A is an external perspective view thereof, and FIG. 7B is a partially enlarged cross-sectional view of the inside shown in FIG.

[Explanation of symbols]

 1 Magnetic Paint Supply Device of the Present Invention 10 Magnetic Paint Supply System 11 Storage Tank 13 Supply Pump 20 Additive Supply System 21 Additive Stock Tank 23 Additive Supply Pump 24 Pressure Adjustment Valve 30 Line Mixer 33 Die Head 40 Additive Input Control System 41 Flowmeter (Magnetic paint flowmeter) 42 Flowmeter (Flowmeter for additive supply) 43 Controller 44 Servo amplifier 45 Additive amount calculation device 50 Operation panel 51 Additive amount setting digital switch

Claims (2)

[Claims] 1. A magnetic coating material supplied under a predetermined pressure is applied with a pressure higher than the predetermined pressure in accordance with the flow rate of the magnetic coating material, and the additive is constantly added. A method for supplying a magnetic coating material, which comprises supplying a uniformly mixed magnetic coating material to a coating device. 2. A magnetic paint supply source, an additive supply source, a magnetic paint supply pump connected to the magnetic paint supply source through a pipe, a flowmeter for magnetic paint, and a pipe for the additive supply source. A magnetic paint supply device including an additive supply pump, an additive flowmeter, and a pressure control valve connected via a magnetic material.