JPH0464442B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a coil for winding and gluing electric wires made of heat-resistant resin by baking a wholly aromatic polyimide-amide resin into a predetermined shape. Regarding winding.

[Conventional technology]

As an example of a conventional coil, a voice coil for a speaker is shown in the drawing. In the figure, 1 is a bobbin, and 2 is a winding.

As this winding wire, an insulated wire in which an insulating coating of polyurethane nylon, polyester, polyester nylon, etc. is baked onto a conductive wire material such as a copper wire, a copper-clad aluminum wire, or an aluminum wire is conventionally used.

In order to bond the winding 2 to the bobbin 1 as described above, the same resin as that used for the insulation coating is used in a solvent-reactivable state.
It is applied onto the baked insulating coating and activated by adhering a solvent to it during winding, thereby adhering the windings 2 to each other and the windings 2 and the bobbin 1.

Next, after the solvent is evaporated, the adhesive is thermally cured at an appropriate temperature to form a complete bond.

Methyl alcohol is often used as a solvent for the above resins.

In recent years, wholly aromatic polyimide-amide resins have come to be used as heat-resistant coatings for insulated wires in order to improve the heat resistance of coils.

The same method as described above is used for winding insulated wire using this coating, but di- Special polar solvents such as methyl acetamide are used.

[Problem that the invention seeks to solve]

This special polar solvent dimethyl acetate
Amide has a high boiling point of 165.5 degrees Celsius, so the amount of volatilization at room temperature is small, so it is necessary to perform a preliminary drying process.

This is because if this solvent remains when the resin is thermally cured, the resin will harden while the solvent evaporates, resulting in bubbles.

In order to prevent the generation of bubbles, prolongation of the pre-drying process, and uneven drying, it is desirable to reduce the amount of solvent deposited as much as possible.

However, if the amount of solvent deposited is small, it is difficult to determine whether the solvent has been applied or not.

If this solvent does not adhere or if it does adhere but the amount is so small that it cannot be reactivated, problems such as the winding unraveling at that part will occur even after thermal curing.

[Purpose of the invention]

The present invention makes it possible to visually determine the amount of attached solvent, so that the amount of attached solvent can be kept at the minimum amount required for reactivation of the resin, and it is possible to ensure that the amount of attached solvent is maintained between the windings and between the windings. Intended for gluing bobbins.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention provides a method for winding and adhering an electric wire having a wholly aromatic polyimide-amide insulation coating. The gist is that the special polar solvent attached to the resin is colored with a dye or the like in order to reactivate the resin.

[Embodiments of the invention]

An embodiment of the present invention will be described with respect to the winding of a voice coil for a speaker shown in the drawings.

The winding 2 used in this coil is an insulated wire coated with a wholly aromatic polyimide-amide resin.

The insulated wire is coated with a fully aromatic polyimide-amide resin that can be reactivated by a solvent, and the surface of the bobbin 1 is also coated with a fully aromatic polyimide-amide resin that can be reactivated by a solvent. of resin is applied.

The special polar solvent that activates the resin includes:
Dimethyl acedoamide is used, and this solvent is precolored with an organic dye.

These organic dyes include heat-resistant phthalocyanine and anthraquinone dyes, such as BASF's ZAPONFASTBLUE-HFL, Mitsubishi Kasei's DIARESIN BLUE or DIANIX.
FAST BLUE etc. are effective.

The winding wire 2 is passed through an impregnated material such as cotton onto which the solvent has been dripped, and the material is wound around the bobbin 1. The wholly aromatic polyimide-amide resin coated on the surface of the substrate is activated and is thermally cured to become bondable.

At this time, the amount of the special polar solvent attached to the surface of the winding wire 2 can be determined by the lightness and darkness of the color of the organic dye added thereto, and the amount of the solvent dripped is adjusted while visually observing this. The amount of adhesion can be controlled.

In this way, since the amount of the special polar solvent deposited is the minimum amount that can be activated, the pre-drying step can be omitted or the time required can be minimized, and the uneven drying can be eliminated to prevent the generation of bubbles. be.

The above embodiments have been explained about voice coils for speakers, but the windings of the present invention can also be used for windings of devices that use coils such as motors and transformers, or coils that do not use bobbins. Therefore, the same effects as the present invention can be achieved.

〔Effect of the invention〕

As mentioned above, the present invention is based on fully aromatic polyimide.
A wholly aromatic polyimide-amide resin that can be reactivated by a solvent is coated on an amide resin insulated wire, and a special polar solvent that reactivates it is colored and adhered to it. The amount of attached polar solvent can be visually determined by the shade of color, and the amount of attached polar solvent can be controlled to be constant.

Therefore, variations in the amount of solvent deposited can be minimized, and coil defects such as generation of bubbles and unraveling of the windings can be reduced.

By reducing the amount of the adhesive to the minimum required for activation, it is possible to omit the pre-drying step or to minimize the time required, which has the effect of improving production efficiency.

[Brief explanation of drawings]

The figure is a perspective view of a voice coil for a speaker. 1...Bobbin, 2...Winding.

Claims (1)

[Claims] 1 In order to reactivate the solvent-reactivable wholly aromatic polyimide-amide resin coated on the wire in order to wind and bond the wire with a wholly aromatic polyimide-amide insulation coating, this A coil winding characterized in that a special polar solvent that is attached to the coil is colored with a coloring agent such as a dye.