JPH06131929A - Manufacture of insulation-covered metal tape - Google Patents

Abstract

PURPOSE:To manufacture an insulation-covered metal tape suppressing the generation of burrs when a metal foil is cut into a tape shape and having a sufficient insulation characteristic. CONSTITUTION:An insulation cover layer 3 is applied to a metal foil 1 in advance, it is cut into a tape shape, and an insulation cover treatment is again applied to a cut section 2 to form an insulation cover layer 4. The metal foil 1 insulation-covered in advance is cut into a tape shape, and the generation of burrs causing defective insulation is suppressed. An insulation cover treatment is again applied, and a completely insulation-covered metal tape can be manufactured at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an insulation-coated metal tape used in electronic equipment such as transformers and motors, and in particular, an insulation-coated ultra-thin metal tape used in small transformers and small electric motors. The present invention relates to a manufacturing method of.

[0002]

2. Description of the Related Art From the viewpoint of minimizing energy loss, tough pitch copper and oxygen-free copper are mainly used for the metal portion of insulating coated metal tapes for electronic parts such as transformers and motors. In the case of a relatively thick tape, the conventional manufacturing method is to cut the metal foil manufactured by rolling etc. into a tape shape, and the burrs generated at that time are removed by rolling etc. It was manufactured by applying an insulating coating treatment, and in the case of an ultrathin tape, it was manufactured by applying an insulating coating treatment to a metal tape manufactured by rolling a wire rod.

[0003]

The metal foil in the present invention includes a thin foil having a thickness of 10 μm or less and a relatively thick foil having a thickness of about 1 mm. Recently, due to miniaturization of transformers and motors, there is an increasing demand for an ultra-thin and wide insulating-coated metal tape, for example, an ultra-thin insulating-coated metal tape having a thickness of 20 μm and a width of about 1.5 mm.
However, in the method of rolling a wire rod, the production limit is about 30 times the width of the tape, and it is difficult to produce a wider metal tape having a width larger than that.

On the other hand, in the method of cutting the metal foil into a tape, when the material is ductile such as copper, burrs such as burrs easily occur on the cut surface, and since the tape is thin, the ends are rolled. It was also difficult to remove burrs.
Even if the tape having the burrs is subjected to the insulation coating treatment, there is a problem in that the coating layer in the burrs portion becomes thin due to the surface tension of the insulation coating layer, resulting in poor insulation. Therefore, it is possible to use a method in which burrs do not occur when cutting into a tape shape, for example, a method of cutting by etching or the like, but there is a problem that it is extremely expensive.

The present invention has been made as a result of intensive studies in view of such circumstances. The purpose of the present invention is to produce an insulating coated metal tape having good insulating properties at a low processing cost. To provide.

[0006]

That is, according to the present invention, a metal foil which has been previously subjected to an insulation coating is cut into a tape shape,
It is a method for producing an insulating coated metal tape, which comprises subjecting at least a surface including a cut surface to the insulating coating again.
Needless to say, the present invention is applicable not only to an extremely thin metal tape but also to a relatively thick metal tape.

The cutting process in the present invention includes not only shearing process using a cutting blade but also cutting process using a grindstone or the like. The insulating coating layer is made of synthetic resin such as polyethylene, polyester, polyurethane, polyvinyl, and fluororesin, or rubber such as ethylene rubber, silicon rubber, fluororubber, and natural rubber.

[0008]

In the present invention, since the metal foil is subjected to the insulation coating treatment in advance and then cut, the burrs such as burrs generated on the cut surface are small due to the tension of the insulation coating layer formed in advance. Since it can be suppressed, if you perform insulation coating again,
Even at the cut portion, the insulating coating layer can be formed so that the insulating coating layer does not break or become too thin at the burr portion. Therefore, a metal tape having sufficient insulating properties can be manufactured.

[0009]

【Example】

(Embodiment 1) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the tough pitch copper is 300 mm wide, 0.02 mm thick, and 3000 m long.
The average thickness of polyurethane is about 2.5 μm on the metal foil 1 of m.
Then, the insulating coating layer 3 was formed by baking. The metal foil 1 on which the insulating coating layer was formed was cut into a tape having a width of 1.4 mm in parallel with the longitudinal direction with a cutting blade. Ten of the above tapes were randomly sampled, and seven of them were baked on the entire surface with polyurethane again, and as shown in FIG.
And the total thickness of the insulating coating layers 3 and 4 is 5 μm.
So that

As a result of investigating the insulation characteristics of these seven tapes, all seven tapes were sufficiently insulated over the entire length of 3000 mm. When the cross-sections of these tapes were cut and investigated, the polyurethane layer was not thinned at the cut portion 2 as shown in FIG. When the remaining three tapes among the above ten tapes were examined, all three tapes had small burrs at the cut portion 2 as shown in FIG. 1 and were substantially negligible.

COMPARATIVE EXAMPLE 1 The same metal foil 1 as in Example 1 above was not covered with an insulating coating, but had a width of 1.
It was cut into a 4 mm tape shape. 10 of the above tapes
Books were randomly selected, and seven of them were coated with an insulating coating layer 3 made of polyurethane so as to have a thickness of 5 μm. The cross section is shown in FIG.

As a result of investigating the insulation characteristics of these seven tapes, all seven tapes were defective in insulation. When the cross sections of these seven tapes were cut and examined, the insulating coating layer 3 of polyurethane was thinned at the burr 5 as shown in FIG. In addition, when examining the remaining three cross-sections of the above tape, as shown in FIG.
All three burr 5 with the above swell is 3000
It was present over the entire length of mm.

(Embodiment 2) As in Embodiment 1, FIG.
Width 300mm, thickness 0.02mm, length 3
Metal foil 1 made of 000 mm copper-0.1 wt% tin alloy
After baking 2.5 μm thick polyurethane to form the insulating coating layer 3, 10 pieces were extracted from the tape which was cut into a tape shape with a width of 1.4 mm in the longitudinal direction, and 7 pieces of them were extracted. Then, the baking of polyurethane was performed again so that the total thickness of the insulating coating layers 3 and 4 would be 5 μm as shown in FIG.

As a result of investigating the insulation characteristics of these seven tapes, it was found that all seven tapes had sufficient insulation over the entire length of 3000 mm. When the cross-sections of these tapes were cut and investigated, the polyurethane layer was not thinned at the cut portion 2 as shown in FIG. In addition, when examining the remaining three of the above ten tapes, all three tapes have small burrs at the cutting portion 2 as shown in FIG. Met.

(Comparative Example 2) The same copper as in Example 2 was used.
The metal foil 1 made of a 0.1 wt% tin alloy was cut into a tape having a width of 1.4 mm in the longitudinal direction without insulating coating.
Ten of the tapes were randomly sampled, and seven of them were coated with an insulating coating layer 3 made of polyurethane so as to have a thickness of 5 μm. The cross section is shown in FIG.

As a result of investigating the insulation characteristics of these seven tapes, as in Comparative Example 1, all seven tapes were defective in insulation. When the cross-sections of these seven tapes were cut and investigated, all three tapes had thin polyurethane insulating coating layers 3 at the burrs 5 as shown in FIG. It was Further, when the cross-sections of the remaining three tapes were examined, as shown in FIG. 3, all the burrs 5 having a bulge of 1 μm or more at the cutting portion 2 were 3000 m.
It was present over the entire length of m.

[0017]

As described above, according to the present invention, the metal foil is preliminarily subjected to the insulating coating treatment, cut into a tape shape, and then subjected to the insulating coating treatment again. The occurrence of burrs, which is the cause, can be suppressed, the insulating coating layer is too thin, or the part without the insulating coating layer does not occur,
An insulating coated metal tape having good insulating properties can be manufactured.

By using the manufacturing method according to the present invention, it is possible to cut a wide metal tape from a metal foil into a tape shape by using a conventional inexpensive cutting method so that burrs are substantially not generated. It can be manufactured at an extremely low cost, unlike the case where cutting is performed by etching or the like.
Therefore, it becomes possible to supply the ultra-thin metal tape coated with insulation at low cost, which contributes to the further downsizing and cost reduction of electronic components such as small transformers and motors, and promotes the demand thereof, which is industrially remarkable. It makes a contribution.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. Cross-section of the tape in a state where the metal foil that has been subjected to insulation coating is cut into a tape shape.

FIG. 2 is a cross-sectional view of the tape of FIG. 1 showing a state in which the tape is again subjected to insulation coating treatment.

FIG. 3 shows a comparative example of the present invention. Cross-section of the tape when the metal foil is cut into a tape.

FIG. 4 is a cross-sectional view of the tape of FIG. 3 showing a state in which an insulating coating process has been performed on the tape.

[Explanation of symbols]

 1 Metal foil 2 Cut part 3 Insulation coating layer 4 Insulation coating layer 5 Burr

Claims (1)

[Claims] 1. A method for producing an insulating coated metal tape, which comprises cutting a metal foil, which has been subjected to an insulating coating treatment in advance, into a tape shape, and then subjecting the surface including at least the cut surface to the insulating coating treatment again.