JPH05205638A - Manufacture of ferrite sheet laminate for correction of deflection yoke magnetic field - Google Patents

Abstract

PURPOSE:To facilitate exfoliation and enhance easiness in works by laying a ferrite sheet on a mould releasing paper with a sticking agent layer interposed, cutting it, and disengaging the tension. CONSTITUTION:A long stretching ferrite sheet 3 of such a structure that soft ferrite is dispersed in a plastic and a long stretching mould releasing paper 4, on one of whose surfaces, a sticky agent layer 8 is laid on, are fed to pressure rollers 10 continuously. To the ferrite sheets 3 a tension fore and after in the longitudinal direction is applied, and the sheet 3 is laid on the mould releasing paper 4 while the sheet 3 is elongated and the sticky agent layer 8 is interposed. The portion of this laminate with sheet 3 and sticky agent layer 8 is put in parallel with the width direction and length direction and separated into a plurality of chip-form ferrite pieces. The tension applied to the sheet 3 in its longitudinal direction is disengaged, and each sheet piece is shrunk by the resilient restoring force of the sheet 3, and cut groove 5 in parallel with the width direction of the sheet 3 is enlarged. This permits exfoliating sheet pieces one by one certainly to lead to the enhancement of the easiness in works.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a ferrite sheet laminated body for magnetic field correction of a deflection yoke in which a large number of chip-shaped ferrite sheet pieces are laminated on a release paper via an adhesive layer, and more specifically, The present invention relates to a method for manufacturing a ferrite sheet laminate for magnetic field correction, in which a chip-shaped ferrite sheet piece can be easily peeled off from a release paper.

[0002]

2. Description of the Related Art A technique for correcting a magnetic field by pasting a ferrite sheet piece made of a synthetic resin mixed with ferrite powder on the inner surface of a deflection yoke mounted on a cathode ray tube of a television receiver or a CRT display is already known. For example, as shown in FIG. 1, on the surface of the deflection yoke 1, a chip-shaped chip-shaped ferrite sheet piece 2 formed by dispersing soft ferrite in a synthetic resin is attached at a proper position where the magnetic field is to be corrected. Thus, the magnetic field of the deflection yoke is corrected.

In order to produce this chip-shaped ferrite sheet piece 2, a long ferrite sheet usually made of a material in which soft ferrite is dispersed in a synthetic resin is used, and a long adhesive sheet is formed on one side. On a strip of release paper, a pressure-sensitive adhesive layer is laminated and pressure-bonded so as to intervene to produce a ferrite sheet laminate, and the ferrite sheet and the pressure-sensitive adhesive layer portion of the ferrite sheet laminate are separated by a Thomson blade or another blade. By cutting the ferrite sheet in parallel with each of the width direction and the length direction using a cutting means, a state in which a large number of strip-shaped chip-shaped ferrite sheet pieces are juxtaposed on the release paper is realized. Then, at the time of use, each chip-shaped ferrite sheet piece 2 is peeled off one by one from this release paper and attached to the surface of the deflection yoke 1.

[0004]

However, the cutting of the ferrite sheet on the release paper is performed by simply pressing the Thomson blade against the ferrite sheet and the pressure-sensitive adhesive layer. However, there is a problem in that even if the ferrite sheet on the surface is cut, the internal pressure-sensitive adhesive layer has an uncut portion, which makes it difficult to peel off the chip-shaped ferrite sheet from the surface of the release paper during the work. There is also a problem that when one chip-shaped ferrite sheet is peeled off because the adhesive layer is not completely separated, another chip-shaped ferrite sheet is continuously peeled off in succession. It was

The present invention has been made in view of the above-mentioned situation, and provides a perfect separation state between a large number of chip-shaped ferrite sheet pieces laminated in parallel on a release paper. It is possible to easily peel off the chip-shaped ferrite sheet piece from the release paper, thereby disclosing a manufacturing method capable of providing a ferrite sheet laminated body for magnetic field correction capable of improving workability. Is.

[0006]

In order to solve the above problems, the present inventor has conceived to utilize the elastic restoring force of a ferrite sheet. That is, a ferrite sheet that has been stretched by applying tension and release paper that has an adhesive layer formed on one side are laminated and pressure-bonded to form a ferrite sheet laminate, and the ferrite sheet and the adhesive layer in this ferrite sheet laminate are formed. If the chip-shaped ferrite sheet pieces are cut, the chip-shaped ferrite sheet pieces formed by the cutting contract due to elastic restoring force, and the cutting grooves between the chip-shaped ferrite sheet pieces are expanded, and the chip-shaped ferrite sheet pieces are easily peeled off. The present invention has been made based on the idea that it may be.

The present invention made based on such an idea is
A long ferrite sheet made of a material in which soft ferrite is dispersed in a synthetic resin and a long release paper with an adhesive layer laminated on one side are continuously supplied between the pressure rollers, and the ferrite sheet is moved in the longitudinal direction. While stretching the ferrite sheet by simultaneously applying a tension to the ferrite sheet, the ferrite sheet is laminated on the release paper with an adhesive layer in the middle to form a long ferrite sheet laminate, and The ferrite sheet and the pressure-sensitive adhesive layer portion of the ferrite sheet laminate are cut parallel to each of the width direction and the length direction of the ferrite sheet, and the cutting cuts the ferrite sheet and the pressure-sensitive adhesive layer into a plurality of chip-shaped ferrite sheet pieces. At the same time as separating, the tension acting in the longitudinal direction of the ferrite sheet was released, Is characterized by comprising an enlarged width direction parallel to the cutting groove of the ferrite sheet by retracting the respective tip-like ferrite sheet piece by the elastic restoring force of the light sheet.

[0008]

As described above, according to the method of manufacturing a magnetic field correcting ferrite sheet for a deflection yoke according to the present invention, a long ferrite sheet which is in an expanded state by applying tension and a long sheet which has an adhesive layer formed on one side thereof are provided. After the release paper is laminated and pressure-bonded, the ferrite sheet and adhesive layer are cut while leaving only the release paper to shrink each chip-shaped ferrite sheet piece by the elastic restoring force of the ferrite sheet. Indicates that the cut groove cut in parallel with the width direction of the ferrite sheet laminate will be significantly enlarged. At this time, the cutting groove parallel to the length direction of the ferrite sheet laminate is also slightly expanded, but the expansion amount is smaller than the expansion amount of the cutting groove cut parallel to the width direction. Since it has a rectangular shape, the chip-shaped ferrite sheet piece can be easily peeled off if the long side is reliably cut off. Further, even if the enlarged groove is on the short side of the chip-shaped ferrite sheet piece, at least two sides of the peripheral four sides of the chip-shaped ferrite sheet piece are reliably separated from the adjacent chip-shaped ferrite sheet piece. , Its peeling becomes much easier.

[0009]

The details of the present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 is an explanatory view showing a usage state of the chip-shaped ferrite sheet piece, and shows a state in which the chip-shaped ferrite sheet piece 2 is attached to a position on the winding surface of the deflection yoke 1 where the magnetic field should be corrected.

Such a chip-shaped ferrite sheet piece 2
2 is provided in a state in which a large number of chip-shaped ferrite sheet pieces 2 are arranged side by side on a release paper 4 as shown in FIG. The present invention relates to a method for manufacturing. In the present invention, the arrangement state of the chip-shaped ferrite sheet pieces 2 on the release paper 4 is at least long as shown in FIG. 2 so that each chip-shaped ferrite sheet piece 2 can be easily separated from the release paper 4. The cutting groove 5 in the width direction of the ferrite sheet 3 is expanded, and the adjacent chip-shaped ferrite sheet pieces 2 are separated from each other.

That is, as shown in FIG. 3, reference numeral 4 in the drawing is a release paper, 2 is a chip-shaped ferrite sheet piece, and 5 is a release paper 4.
Is a cutting groove for cutting the chip-shaped ferrite sheet 2 away from each other in parallel with the width direction, and 6 is a groove cut in parallel with the length direction. Among the cutting grooves, the cutting groove 5 parallel to the width direction has a width sufficient to separate adjacent chip-shaped ferrite sheet pieces 2 from each other as shown in the figure, while the cutting groove 5 in the length direction No. 6 is merely a cut.

It is an object of the present invention to provide a manufacturing method capable of obtaining a ferrite sheet laminated body in which the cutting groove 5 parallel to the width direction has a sufficient width as described above. A manufacturing method for obtaining such a ferrite sheet laminate is shown in FIGS. 4 and 5. That is, as shown in FIG. 4, an original fabric of the long ferrite sheet 3 supplied from the ferrite sheet roll 7 and an original fabric of the release paper 4 having the adhesive layer 8 formed on the surface thereof supplied from the release paper roll 9. Pressing roll 1
By passing between 0 and 10, the long ferrite sheet 3 and the long release paper 4 are laminated and pressure-bonded with the pressure-sensitive adhesive layer 8 interposed therebetween. When the long ferrite sheet 3 is supplied from 7 to the pressing roll 10, it is supplied while applying a back tension bt, and after stacking and pressure bonding with the pressing rolls 10 and 10, the tension t is also taken up when winding with the winding roll 11. Try to wind it while hanging it. Although the release paper 4 does not expand even when the tension t is applied, since the long ferrite sheet 3 has the flexibility peculiar to synthetic resin, the long ferrite sheet 3 is placed between the pressure rolls 10 and 10 with the back tension bt applied. If the ferrite sheet 3 is passed, the ferrite sheet 3 is adhered to the pressure-sensitive adhesive layer 8 of the release paper 4 in a tensioned state, and the ferrite sheet laminated body is wound around the winding roll 11 in this state.

Then, in the process of rewinding the ferrite sheet laminated body wound on the take-up roll 11 as shown in FIG. 5, the Thomson blade 12 is pressed against the surface of the ferrite sheet laminated body from above to release only the release paper 4. The long ferrite sheet 3 and the pressure-sensitive adhesive layer 8 are cut lengthwise and widthwise, leaving the above. By this cutting, the long ferrite sheet 3 is separated into strip-shaped chip-shaped ferrite sheet pieces 2 and, at the same time, the tension applied to the long ferrite sheet 3 is released. The sheet-shaped ferrite sheet pieces 2 contract and restore due to the elastic restoring force, and the distance between adjacent chip-shaped ferrite sheet pieces 2 is enlarged. Thus, as shown in FIG. 2, a ferrite sheet laminated body in which strip-shaped chip-shaped ferrite sheet pieces 2 are arranged in parallel is formed.

Details of this state are also shown in FIG. That is, the width of the chip-shaped ferrite sheet piece 2 on the release paper 4 in the sheet length direction, that is, the short side width is contracted so that the edge position is a solid line state from the cutting position by the Thomson blade 12 shown by the dashed line in the figure. 12 'to the position 12', and the adhesive layer 8 is also cut along with this contraction, and then separated from each other, so that the cutting groove 5 between the chip-shaped ferrite sheet pieces 2 is greatly enlarged as shown in the figure. The pressure-sensitive adhesive layer 8 is completely cut off.

As described above, the larger the enlarged state of the enlarged cutting groove 5 in the magnetic field correcting ferrite sheet laminate of the deflection yoke, the easier it is to release the chip-shaped ferrite sheet piece 2 from the release paper. It was experimentally confirmed that the enlarged gap of the cutting groove 5 is easily peeled off in a state of, for example, about 0.5 to 1.0 mm. Further, the degree of tension applied to the long ferrite sheet 3 is determined by the following when the chip-shaped ferrite sheet piece 2 contracts after the cutting groove 5 is formed.
Usually, the width of the chip-shaped ferrite sheet piece 2 in the sheet length direction, that is, the short side width of the chip-shaped ferrite sheet piece 2 is about 10 mm.
It has also been experimentally confirmed that it is preferable to apply a tension that gives an elongation of about 1.0 mm.

As the ferrite sheet 3 used here, soft ferrite, for example, manganese zinc ferrite, nickel zinc ferrite, or the like is used as a synthetic resin, as in the known ferrite-containing plastic sheet containing conventional soft ferrite. For example, a material prepared by mixing polyvinyl chloride, polyamide, chlorinated polyethylene, acrylonitrile butadiene rubber, olefin rubber or the like to have a desired thickness is used.

[0017]

As described above, according to the method of manufacturing the magnetic field correcting ferrite sheet laminate of the deflection yoke according to the present invention, the ferrite sheet which is stretched by applying tension and the adhesive layer formed on one side are separated. After the pattern paper is laminated and pressure-bonded, the ferrite sheet and the adhesive layer are cut to shrink each chip-shaped ferrite sheet piece by the elastic restoring force of the ferrite sheet. The cutting groove cut in parallel with is greatly expanded, the adjacent chip-shaped ferrite sheet pieces are sufficiently separated from each other, and the adhesive layer, which was difficult to separate in the past, was completely separated. This makes it easy to remove each chip-shaped ferrite sheet piece from the release paper. Plural eliminates the problem of peeling and continuous chip-shaped ferrite sheet piece, a chip-like ferrite sheet piece so can be peeled reliably one by one when.

[Brief description of drawings]

FIG. 1 is an explanatory view of a state of use showing a state in which a chip-shaped ferrite sheet piece is attached to the winding surface of a deflection yoke.

FIG. 2 is a plan view showing an example of a ferrite sheet laminate manufactured by the manufacturing method of the present invention.

FIG. 3 is an enlarged perspective view showing an example of a ferrite sheet laminate manufactured by the manufacturing method of the present invention.

FIG. 4 is an explanatory view showing an example of the manufacturing method of the present invention, showing a step of laminating a release paper with a long ferrite sheet in a tensioned state by applying tension.

FIG. 5 is an explanatory view showing an example of the manufacturing method of the present invention and showing a step of forming a cutting groove in the ferrite sheet laminate after lamination.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deflection yoke 2 Chip-shaped ferrite sheet piece 3 Long ferrite sheet 4 Release paper 5 Cutting groove in width direction 6 Cutting groove in length direction 7 Ferrite sheet roll 8 Adhesive layer 9 Release paper roll 10 Press roll 11 Winding roll 12 Thomson blade bt Back tension t Tension

Claims (1)

[Claims] 1. A long ferrite sheet formed of a material in which soft ferrite is dispersed in a synthetic resin, and a long release paper having an adhesive layer laminated on one side are continuously supplied between pressing rollers to form a ferrite sheet. On the other hand, while stretching the ferrite sheet by simultaneously applying tension in the longitudinal direction to the longitudinal direction, the ferrite sheet is laminated on a release paper with an adhesive layer in the middle to form a long ferrite sheet laminate. Along with the formation, the ferrite sheet and the pressure-sensitive adhesive layer portion in the ferrite sheet laminate are cut in parallel in each of the width direction and the length direction of the ferrite sheet, and the cutting cuts the ferrite sheet and the pressure-sensitive adhesive layer into a plurality of chips. The tensile force acting in the longitudinal direction of the ferrite sheet is released at the same time when the ferrite sheet is separated into pieces. A method for manufacturing a ferrite sheet laminated body for magnetic field correction of a deflection yoke, in which each chip-shaped ferrite sheet piece is contracted by elastic restoring force of the ferrite sheet to enlarge a cutting groove parallel to the width direction of the ferrite sheet. .