KR950013994B1 - Auto dispersion method and it's device for magnetic paint - Google Patents

Abstract

The magnetic paint for a recording material is dispersed on a base film(18). The base film(18) is supplied by a supply roll(16) through a vertical path in a horizontal frame(10), and the base film(18) is wound by a winding roll(20). The base film(18) is horizontally supported by a film supporting plate(22) in the vertical path between the supply roll(16) and winding roll(20). The magnetic material is orderly oriented by a permanent magnet(30), and the base film(18) is coated and wound by the winding roll(20).

Description

Magnetic paint automatic dispersion method and device

1 is a schematic plan view of a magnetic paint dispersion apparatus according to an embodiment of the present invention.

2 is a schematic plan view of a magnetic paint dispersion device according to an embodiment of the present invention.

3 is a schematic side view of a magnetic paint dispersion device according to an embodiment of the present invention.

4 is a perspective view of the magnetic paint dispersion device shown in FIGS.

Figure 5 is a schematic diagram showing the principle that the magnetic coating applied to the film is oriented in a constant direction by the permanent magnet when using the apparatus of the present invention.

6A and 6B are microscopic organization charts showing the degree of orientation of the magnetic body in the film coated with the magnetic paint according to the method of the present invention and the film coated with the magnetic paint by the conventional manual method.

* Explanation of symbols for main parts of the drawings

10: horizontal frame 12: spaced apart support beam

16: supply roller 18: base film

20: winding roll 22: film support plate

26: coating member 28: cross beam

30: permanent magnet 38, 40: guide roll

42: drive motor 50: controller

The present invention relates to a magnetic paint dispersion method and apparatus therefor, in particular, to uniformly coat a magnetic coating layer of a certain thickness on the surface of a film in an automatic manner in order to accurately evaluate the characteristics of the magnetic coating used as a raw material of a recording medium. At the same time, the present invention relates to a magnetic paint automatic dispersion method and apparatus for aligning a magnetic body of a magnetic paint layer in one direction using a permanent magnet.

A recording medium such as a magnetic tape is prepared by dispersing a magnetic coating on a surface of a polymer film to a predetermined thickness and then drying it. The magnetic coating used here acts as an important variable that determines the quality of the recording medium. do. Therefore, if a new kind of magnetic paint is developed or if the current magnetic paint is to be replaced with another kind, it can be mass-produced on a commercial scale to accurately evaluate the physical or chemical properties before applying it to the actual product. There is a need. Important characteristics of magnetic paints include viscosity, glossiness, dispersion, and self-orientation, but in order to accurately evaluate these properties, it is important to uniformly disperse the magnetic coating on the base film.

Conventionally, in evaluating the physical properties of a magnetic paint extracted as a sample, first, the base film cut to the specification is fixed to a glass plate, the surface of the base film is washed, and then a certain amount of magnetic paint is poured onto the film, and the operator With the application spatula holding a slight gap from the film, the film was pulled in one direction to disperse the magnetic paint, and the dispersed paint was dried, and then the glossiness and dispersion of the paint were measured. As a result, not only the dispersion state of the magnetic coating varies depending on the operator, but even the same operator has a problem in that the magnetic coating distribution and thickness variation for each measurement site occur. Moreover, when employing the conventional manual dispersion method, since the magnetic body cannot be oriented in one direction on the film, evaluation of the degree of self-orientation, which is one of important measurement items, was impossible.

The present invention has been made in view of the problems of the prior art as described above, and its object is to maintain a uniform thickness regardless of the number of molding and dispersing operations of the operator by maintaining a uniform dispersion condition of the magnetic paint at all times. A magnetic paint dispersion method and apparatus capable of dispersing a paint on a base film and orderly aligning a magnetic material contained in the magnetic paint in one direction.

The magnetic paint dispersion device of the present invention for achieving the above object is a horizontal frame for providing a longitudinal passage through which the base film can move, and is journaled rotatably at one end of the frame to the longitudinal passage; A supply roll for supplying the base film through the feed roll, a winding roll rotatably journaled at the other end of the frame so as to wind the base film, and disposed in a longitudinal passage between the supply roll and the winding roll, A film support plate for supporting the horizontally, a coating member mounted on a frame across the longitudinal passage to uniformly disperse the magnetic paint placed thereon upon movement of the base film, and a magnetic coating dispersed by the coating member. Zero is installed in the transverse direction on the downstream side of the coating member in order to orientally order the magnetic material of the A spherical magnet and a motor for intermittently rotating the winding roll to move the base film downstream through the coating member and the permanent magnet.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 show the structure of the automatic magnetic paint dispersion device according to the present invention in detail, which is used to automatically disperse the magnetic paint extracted as a sample on a base film. The horizontal frame 10 is adopted as a basic component. The horizontal frame 10 has a pair of spaced apart support beams 12 defining a longitudinal passage through which the base film can move, and at the bottom thereof, a series of adjustment bolts 14 are attached to adjust the horizontal state. have. Feed roll 16 is rotatably journaled at one end of the horizontal frame 10 to supply the base film 18 through the longitudinal passage, while winding rolls are formed at the other end of the horizontal frame 10. 20 is installed in the same manner as the supply roller 16 to wind the base film 18 intermittently. In addition, a film support plate 22 for horizontally supporting the base film 18 is provided in the longitudinal passage between the supply roll 16 and the winding roll 20. As the film support plate 22, the film support plate 22 is smooth. It is preferable to use tempered glass having a surface. In mounting the film support plate 22 to the frame 10, a vertical slot 12a is formed in the support beam 12, and then a pair of screws 24 are inserted into the vertical slot 12a to form a film support plate ( By fixing 22, it is possible to loosen the screw 24 and adjust the height of the film support plate 22 as necessary.

In the middle portion of the longitudinal passage, a cross non-mouth 28 for supporting a block-shaped coating member 26 is provided in the transverse direction of the frame 10. Since the coating member 26 serves to disperse the magnetic paint placed on the base film 18 in a uniform thickness when the base film 18 moves, the smoothness of the bottom surface should be good and the gap with the film support plate 22 is also accurate. Should be. On the downstream side of the cross beam 28, the permanent magnets 30 are arranged at a predetermined interval from the base film 18. As can be seen in FIGS. 2 and 4, the permanent magnet 30 is fixed on the bracket 34 having the vertical slot 32 with a screw 36 so that the height can be adjusted as necessary. It is preferable. The upstream side guide roll 38 and the downstream side guide roll 40 are installed near both ends of the film support plate 22 so that the film can be smoothly moved during operation of the apparatus.

The rotary shaft 44 of the composition motor 42 is connected to the center shaft 20a of the winding roll 20 via the coupler 46. Therefore, when the drive motor 42 operates, the winding roll 20 rotates clockwise, and as a result; The base film 18 moves downstream along the longitudinal passage and is wound around the circumferential surface of the winding roll 20. The operation of the drive motor 42 is precisely controlled by the controller 50 having the pushbutton 48.

Next, a method of dispersing the magnetic paint on the base film 18 using the apparatus as described above will be described.

First, the supply roll 16 is wound around the base film 18, which is the object of application of the magnetic paint, by a sufficient length, and its central axis is inserted into the locking groove 12a of the support beam 12. Subsequently, the end of the base film 18 wound around the supply roll 16 is pulled along the longitudinal passage to the winding roll 20 and then fixed to the outer circumferential surface of the winding roll 20 using an appropriate fixing means. In this state, a predetermined amount of test magnetic paint (M in FIG. 1) is poured on the upstream base film 18 to complete work preparation. Of course, the relative spacing of the application member 26 and the permanent magnet 30 relative to the base film needs to be adjusted in advance before the operation of the device is started.

When the pushbutton 48 of the controller 50 is pressed, the take-up roll 20 connected to the drive motor 42 and its rotating shaft 44 rotates clockwise. Thus, as the base film 18 fixed to the winding roll 20 moves instantaneously in the direction of the arrow A in FIG. 1, the test magnetic paint M is uniform while passing through the lower portion of the coating member 26. FIG. It is dispersed in one thickness to pass through the lower portion of the permanent magnet (30). As shown in FIG. 5, the permanent magnet 30 used in the present invention has a storage strength of about 300 Gauss, and its polarity is divided up and down. Therefore, while passing through the lower portion of the magnetic permanent magnet 30 included in the test magnetic paint (M) is orderly aligned in one direction.

In this dispersion operation, if a large amount of magnetic paint is used as a sample to perform the dispersion operation, it is preferable to install a dryer (not shown) at an appropriate position in the longitudinal passage, but the sample used for the test is mainly a small amount. Therefore, it is not necessary to install a dryer. If the drying step is omitted, all dispersion operations can be completed within a short time of 0.5 to 1 sec, after which both ends of the base film coated with magnetic paint are cut off from the dispersing apparatus and then transported to the sample test site.

6A and 6B are micrographs of the base film coated with the magnetic paint and the part of the base film coated with the conventional manual method using the apparatus of the present invention, respectively. As can be seen from both photographs, the base film coated with the magnetic coating by the method of the present invention is not only excellent in glossiness but also extremely good in orientation of the magnetic body as compared with the conventional one. In addition, the dispersion thickness and glossiness of the magnetic paints measured by the area of the base film also vary considerably between individuals by the conventional manual method, but the dispersion by site is performed because the dispersion is performed by the automatic method. It turned out to be few.

As described in detail above, according to the magnetic paint dispersion method and apparatus of the present invention, since the magnetic coating is automatically dispersed on the base film, a magnetic coating layer having a uniform thickness is always obtained, and furthermore, the permanent magnet is used. By orienting the magnetic material in a predetermined direction, it is possible to provide an excellent effect that even the magnetic properties of the magnetic paint that cannot be evaluated in the conventional manual test method can be evaluated.

Claims (7)

An apparatus for dispersing a magnetic coating used for manufacturing a recording medium on a base film, the apparatus comprising: a horizontal frame providing a longitudinal passage through which the base film can move, and rotatably journaled at one end of the frame; A supply roll for supplying the base film through the longitudinal passage, a winding roll rotatably journaled at the other end of the frame to wind the base film, and a longitudinal passage between the supply roll and the winding roll A film support plate disposed in the substrate to horizontally support the base film, a coating member mounted on a frame across the longitudinal passage to uniformly disperse the magnetic paint thereon upon movement of the base film, and to the coating member. The lower portion of the coating member so as to orderly align the magnetic material in the magnetic coating dispersed in one direction A permanent magnet installed on the side in the horizontal direction, a magnetic paint automatic balancer, characterized in that a motor which is a base film by intermittent rotary drive to the take-up roll to be moved to the downstream side through the application member and the permanent magnet. The magnetic paint automatic dispersion device according to claim 1, further comprising a control means for controlling the operation of the motor. According to claim 1, wherein the permanent magnet is mounted on the frame to adjust the height, the film support plate is characterized in that the magnet is installed to adjust the distance between the film passing through the longitudinal passage and the coating member Automatic paint disperser. 4. The automatic magnetic paint dispersing apparatus according to claim 3, wherein one film guide roller is provided in the vicinity of both ends of the film support plate. A method for dispersing a magnetic paint used for manufacturing a recording medium on a base film, the method comprising: placing a predetermined amount of magnetic paint on the base film, and pulling the base film in one direction and placing the magnetic paint on the base film; Dispersing the film in a uniform thickness, and applying the magnetic field having a predetermined strength to the magnetic paint after dispersion to orient the oil body contained in the magnetic paint in one direction in order. 6. The method of claim 5, wherein the base film has a traction speed of 0.5 to 1 m / sec. The method of claim 5, wherein the intensity of the magnetic field is 300 Gauss.