JPH0660824A - Method for connecting ferrite tape with pressure sensitive type double-sided adhesive sheet - Google Patents

Abstract

PURPOSE:To exhibit high strength with respect to tensile force in the longitudinal direction of ferrite and sufficiently endure with respect to peeling force in the thickness direction without separation by mating cut edges with each other over a wide range by the use of engagement structure including an uneven shape, and connecting a ferrite tape within a predetermined range inclusive of a bonded portion. CONSTITUTION:A ferrite tape Ft where a deficient point has been removed is bonded with cut ends 4a, 4b facing each other. A ferrite sheet auxiliary piece (f) made of the same material as that of the tape Ft is attached to the tape Ft on a side where no adhesive layer is not disposed. A supporting table T' is located under the tape Ft. The auxiliary piece (f) is strongly pressurized at the upper surface thereof by a trowel or roller jig while heating the auxiliary piece (f) and the bonded point. The auxiliary piece (f) is integrated with the tape Ft in such a manner as to be melted in the tape Ft. Consequently, magnetic field generated in a deflection yoke is corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a ferrite tape with a pressure-sensitive double-sided adhesive sheet used for correcting a magnetic field generated by a deflection yoke mounted on a cathode ray tube such as a television receiver or a CRT display.

[0002]

2. Description of the Related Art A technique for correcting a magnetic field by sticking a ferrite sheet piece made of synthetic resin or rubber mixed with ferrite powder to the inner surface of a deflection yoke mounted on a cathode ray tube of a television receiver or a CRT display is known. It is already known. As shown in FIG. 5, such a ferrite sheet piece F has a pressure-sensitive adhesive layer B on the back surface of a ferrite sheet piece body Fs made of ferrite powder-containing resin or ferrite powder-containing rubber.
.. is provided, and the supply form thereof is provided in a state in which a large number of ferrite sheet pieces F, F, ...

The formation of such a continuous body of ferrite sheet pieces F is performed by the following procedure. First, as shown in FIG. 7, width 600 mm created by calender roll forming
The pressure-sensitive double-sided adhesive sheet K is supplied to the back surface of the wide and long sheet J having a length of up to 1000 mm and a length of 20 m to 100 m, and the two sheets in a superposed state are passed between the pressure rollers R to form a laminate of both sheets. Create L. Next, as shown in FIG. 8, this sheet laminated body L is divided into a plurality of ferrite tapes Ft, Ft, ... By a slitter, and then half cuts as breaking grooves v are formed in the ferrite tapes Ft. In use, each ferrite sheet piece F is detached from the release paper S and used.

By the way, the pressure-sensitive double-sided adhesive sheet K means the following. In the above description, the structure of the pressure-sensitive double-sided adhesive sheet K has been described as a laminate of the pressure-sensitive adhesive layer and the release paper, but the details are as shown in FIG. The adhesive layer Bt is applied (hereinafter, referred to as a silicon coating c), and the silicon coatings c and c are sandwiched between the adhesive layers Bt. The silicon coating c on the lower surface of the release paper S is for preventing a number of pressure-sensitive double-sided adhesive sheets K from being stuck to each other when stacked or wound in a roll shape, and is also adhered to the release paper S. The silicon coating c between the agent layer Bt is provided to release the release paper S from the adhesive layer Bt. The pressure-sensitive double-sided adhesive sheet K having such a structure is integrated with the ferrite tape body Fm by adhering the upper surface (A) to the back surface of the ferrite tape body Fm as shown in FIG. The ferrite tape body Fm is formed by pressing the lower surface (B) exposed by peeling S onto an object, for example, the winding surface of the deflection yoke.
It is possible to attach to the winding surface. Thus, the pressure-sensitive double-sided adhesive sheet K has an upper surface (A) and a lower surface (B).
Both mean a sheet body having an adhesive function. still,
In the following description, the silicon film c is omitted for the sake of easy understanding of the description, but it is premised that the silicon film c is present also in these.

The ferrite tape Ft is produced by the above-mentioned procedure. However, defective portions such as pinholes and scratches may occur in the ferrite tape body Fm. It is necessary to remove the defective part. After the breaking groove v is formed in the ferrite tape body Fm, the ferrite tape Ft is set in the automatic machine and moves to the automatic bonding process. Therefore, these defects are checked at each stage before the breaking groove v is formed. It is being appreciated. For example, when a defective portion is found at the stage of the ferrite tape Ft before forming the breaking groove portion, the defective portion G is cut and removed from the ferrite tape Ft as shown in FIG. 11, and then the cut portion is connected. There is.

As this connection method, the same applicant has already proposed the following method. This method is shown in FIG. 12, and the procedure is as follows. First, the defective portion is cut and removed from the ferrite tape Ft, and then the release paper S on the back surface of one of the cut ends a is partially peeled off and the cut end a is removed. A part is superposed on the upper surface of the other cut end b, and a heated iron-shaped jig or roller-shaped jig is pressed from above the superposed part to apply pressure, and the thickness of the superposed part is set to the surrounding ferrite tape Ft. The connection work is completed by making the thickness the same as the thickness.

[0007]

Although the connection method is simple and has a relatively strong tensile strength against the tensile force in the longitudinal direction (X direction) of the ferrite tape Ft as shown in FIG. Since the adhesive layer Bt is present in the middle of the connection portion in the thickness direction, the ferrite tape F
There is a problem that it is weak against the peeling force of t in the thickness direction (Y direction). After the ferrite sheet for magnetic field correction of the deflection yoke is automatically pasted by an automatic machine, it may be necessary to manually readjust the pasting position, but when re-adjusting the pasting position in this way, There was a concern that the ferrite sheet pieces would separate in the thickness direction due to the peeling operation. Further, it is preferable that the ferrite sheet pieces have, as a matter of course, the magnetic characteristics in addition to the physical characteristics. However, in the ferrite sheet pieces obtained by the above connecting method, the adhesive layer Bt is formed in the middle in the thickness direction. Since it exists, there is also a problem that the properties are not uniform with those of other ferrite sheet pieces. The present invention has been made in view of the current situation, and is excellent in both tensile strength in the longitudinal direction and peeling strength in the thickness direction, and in addition, the magnetic characteristics of the connection portion can be the same as those of the other portions. It is intended to provide a connection method, and yet to provide a simple connection method suitable for industrial use.

[0008]

According to the present invention, which has solved the above-mentioned problems, one and the other of the cutting edges, which are in a relative rolling state when a defective portion is cut and removed, are closely joined by a meshing structure including an uneven shape. Cut off the defective part of the ferrite tape with pressure-sensitive double-sided adhesive sheet so that it will have a shape like that, and after that, cut edges are closely joined by concave and convex engagement, and are made of the same material as the ferrite tape body and After extending the ferrite sheet auxiliary piece having a size capable of covering the entire existing range of the joint portion along the side of the ferrite tape body where the adhesive layer is not provided, heating the ferrite sheet auxiliary piece and the joint portion. However, it is characterized in that the ferrite sheet auxiliary piece is integrated with the ferrite tape body by applying a pressing force to the ferrite sheet auxiliary piece. There. The cutting edge can be appropriately used as long as it can be engaged in concave and convex, but is preferably formed in a sawtooth shape, for example.

[0009]

[Operation] In this connection method, the ferrite tape is connected by causing the cut edges to abut each other over a wide range by the meshing structure including the uneven shape and by allowing the ferrite sheet auxiliary piece to melt and penetrate into a certain range including the joint portion. Therefore, the ferrite tape after connection exerts strong strength against tensile force in the longitudinal direction, and since there is no adhesive layer in the middle part in the thickness direction of the connection part, It can withstand the peeling force of. Further, since the material of the connecting portion is the same as the material of the other non-connecting portion, not only the physical characteristics but also the magnetic characteristics can be matched with those of the other portions.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to illustrated embodiments. FIG. 1 shows a state where serrated cuts 3a and 3b are made in the ferrite tape Ft in order to remove the area where the pinhole 1 and the scratch 2 exist from the ferrite tape Ft. The notches 3a and 3b surrounding the defective portion G are formed through the ferrite tape body Fm, the adhesive layer Bt, and the release paper S. In addition, sawtooth-shaped cuts 3a and 3b
Have the same shape, and cut edges 4a and 4b formed by the cuts 3a and 3b are closely joined by a meshing structure.

FIG. 2 schematically shows each step from the step of removing the defective portion G from the ferrite tape Ft to the completion of the connection. First, the ferrite tape Ft from which the defective portion has been removed is the cutting edge 4 which is in the relative rolling state.
The a and 4b are joined with their edges abutted against each other. Since the cutting edges 4a and 4b are formed so as to mesh with each other, the entire cutting edges 4a and 4b are in close contact with the other side. Next, a ferrite sheet auxiliary piece f of the same material as the ferrite tape Ft is placed along the side of the ferrite tape Ft where the adhesive layer is not provided. The ferrite sheet auxiliary piece f has substantially the same width as the ferrite sheet auxiliary piece f, and the size thereof is set to a size capable of covering the entire range where the joint portion exists. Subsequently, a support base T'is set on the lower surface of the ferrite tape Ft, and a trowel-shaped jig or a roller-shaped jig is pressed against the upper surface of the ferrite sheet auxiliary piece f while heating the ferrite sheet auxiliary piece and the joining portion to apply a strong force. The ferrite sheet auxiliary piece f is melted into the ferrite tape Ft by pressurizing with
It is integrated with t. After the integration, the thickness of the ferrite tape Ft at the joining portion becomes the same as the thickness of the other portions, and the cut edges that are in the butted state are the softening phenomenon of the ferrite tape Ft itself and the ferrite sheet auxiliary piece f. It almost disappears due to the phenomenon of melting. As can be seen from the sectional structure of the ferrite tape Ft integrated in this way, the ferrite tape body Fm and the adhesive layer Bt are in a continuous state at the connection points. Further, since the adhesive layer Bt has a structure that exists only on the lower surface of the ferrite tape body Fm, which is the original location, the magnetic characteristics at the connection location can be made the same as the other portions, and the thickness of the ferrite tape body Fm can be the same. Since the pressure-sensitive adhesive layer is not interposed in the middle of the direction, even if a relatively strong peeling force in the thickness direction of the ferrite tape Ft acts on the connection point, it can sufficiently endure without being separated. Further, since the cutting edges are formed in a sawtooth shape and the sawtooth cutting edges are meshed with each other to be closely joined,
Since the contact area between the cutting edges can be widened and the tensile force acting on the cutting edges can be dispersed in multiple directions due to the uneven shape, the ferrite tape Ft
Even if a tensile force in the longitudinal direction is applied to it, it can sufficiently withstand without separation.

In the above embodiment, the ferrite tape Ft
Although the support base T'supporting the bottom surface of the pressure sensitive adhesive sheet is pressed from behind the release paper S, the release paper S may be partially peeled off as shown in FIG. 3 and then directly pressed to the lower surface of the adhesive layer Bt.

FIG. 4 shows another example of a notch formed in the ferrite tape Ft, and shows a state in which the cut edges 4a and 4b are butted after removing the defective portion separated by the notch. The shape of the notch can be appropriately adopted as long as one and the other of the cutting edges that are brought into a relative state by cutting and removal can be closely joined by a meshing structure including an uneven shape, (a), (b), Those shown as (C) and other various types can be adopted.

[0014]

According to the method of connecting the ferrite tape with pressure-sensitive double-sided adhesive sheet of the present invention, the cutting edges are widely abutted with each other in a wide range by the meshing structure including the uneven shape, and the ferrite sheet is included in a certain range including the joint portion. The ferrite tape is connected by allowing the auxiliary piece to melt and infiltrate by heating and pressurizing it,
The ferrite tape after connection exhibits strong strength against tensile force in the longitudinal direction, and since there is no adhesive layer in the middle part in the thickness direction of the connection part, it can resist peeling force in the thickness direction of the ferrite tape. However, it can endure without separation. Further, since the material of the connecting portion is the same as the material of the other non-connecting portion, not only the physical characteristics but also the magnetic characteristics can be matched with those of the other portions. Moreover, the present connecting method is completed by simply pressing the ferrite sheet auxiliary piece on the portion where the cut edges are butted against each other in a heated state, so that the work is simple and industrially applicable.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, showing a state in which a sawtooth-shaped cut is made in a portion surrounding a region where a defective portion exists on a ferrite tape, (a) is a plan view, and (b) is a sectional view. Is.

FIG. 2 is a simplified explanatory view showing each step from the step of removing the defective portion from the ferrite tape to the completion of connection in the embodiment.

FIG. 3 is another embodiment of the present invention, and is a cross-sectional explanatory view of a case where a ferrite tape is supported by directly pressing a support base T ′ against the lower surface of the adhesive layer Bt.

[Fig. 4] (a), (b) and (c) are other examples of the notches formed in the ferrite tape, showing a state where the cut edges are butted after removing the defective portions separated by the notches. ing.

FIG. 5 is an explanatory perspective view showing an appearance of a ferrite sheet piece.

FIG. 6 is an explanatory perspective view showing a ferrite tape having a breaking groove formed therein.

FIG. 7 is an explanatory view of a process of laminating a wide and long ferrite sheet wound in a roll shape and a pressure-sensitive double-sided adhesive sheet.

FIG. 8 is an explanatory view showing each process from the laminate of the wide and long ferrite sheet and the pressure-sensitive double-sided adhesive sheet to the formation of the ferrite tape having the breaking groove.

FIG. 9 is a cross-sectional explanatory view showing the structure of a pressure-sensitive double-sided adhesive sheet.

FIG. 10 is an explanatory sectional view showing the structure of a ferrite tape in which pressure-sensitive double-sided adhesive sheets are laminated.

FIG. 11 is an explanatory diagram showing how defective parts are removed from the ferrite tape.

FIG. 12 is a process explanatory view showing a conventional ferrite tape connecting method.

FIG. 13 is an explanatory cross-sectional view that points out a problem of a conventional ferrite tape connecting method.

[Explanation of symbols]

 F Ferrite sheet piece Fs Ferrite sheet piece body Bs Adhesive layer v Breaking groove J Wide and long sheet K Pressure sensitive double-sided adhesive sheet L Both sheet laminate R Pressure roller Ft Ferrite tape S Release paper c Silicon coating Bt Adhesive Layer Fm Ferrite tape body G Defective part a Cutting edge b Cutting edge 1 Pinhole 2 Scratch 3a Notch 3b Notch 4a Cutting edge 4b Cutting edge T Pressing jig T ′ Support stand f Ferrite sheet auxiliary piece

Claims (2)

[Claims] 1. A defective portion is cut and removed from a ferrite tape with a pressure-sensitive double-sided adhesive sheet, which is formed by laminating a pressure-sensitive double-sided adhesive tape on the back surface of a ferrite tape main body made of ferrite powder-containing resin or ferrite powder-containing rubber, After that, in the method of connecting the ferrite tape with pressure-sensitive double-sided adhesive sheet that connects the cut points, when the defective points are cut and removed, one and the other of the cut edges are in close contact with each other due to the meshing structure including the uneven shape. The defective part of the ferrite tape with pressure-sensitive double-sided adhesive sheet is cut off so that it will have a shape to be joined, and then the cut edges are closely joined by concave and convex engagement, and made of the same material as the ferrite tape body. In addition, a ferrite sheet auxiliary piece having a size capable of covering the entire existing range of the above-mentioned joint portion is used as a ferrite tape. The ferrite sheet auxiliary piece is integrated with the ferrite tape main body by applying a pressure to the ferrite sheet auxiliary piece while heating the ferrite sheet auxiliary piece and the joint portion after the side of the body where the adhesive layer is not provided. A method for connecting ferrite tape with pressure-sensitive double-sided adhesive sheet, which is characterized by 2. The method for connecting a ferrite tape with a pressure-sensitive double-sided adhesive sheet according to claim 1, wherein the cut edges are formed in a sawtooth shape.