JPS636815Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a glass-wrapped rectangular wire that is difficult to cut and that does not lose its shape.

[Technical background of the invention and its problems] Ritsutsu wire has traditionally been used as high-frequency equipment wire, but recently glass-wrapped wire has been used to improve the space factor and electrical and mechanical properties. A flat rectangular wire is used.

Generally, this type of glass-wrapped rectangular wire is made by compression-molding a wire made by twisting a large number of insulated wires into a rectangular shape using forming rolls, wrapping a glass thread horizontally around its outer circumference, and then applying varnish treatment. However, when compression molding into a rectangular shape, the edges become sharp, so the glass thread is easily cut at the edges during horizontal winding or handling. In addition, the Ritsu wire compression-molded into a rectangular shape as described above has the disadvantage that the insulated wire tends to move and lose its shape during handling.

[Purpose of the invention] The present invention was made to solve these conventional drawbacks.
To provide a glass-wrapped rectangular wire which is less likely to be cut by the edges of the wire compressed into a rectangular shape and which does not lose its shape during handling.

[Summary of the invention] In other words, the invention uses a synthetic resin filling formed by heating and melting a thermoplastic synthetic resin material or applying and baking varnish to form a rectangular compression-molded wire between the outer insulating strands. This glass-wrapped rectangular wire is bonded to each other and the sharpness of the rectangular edge portions is reduced, and the above-mentioned drawbacks are eliminated.

[Embodiments of the invention] The details of the invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a cross-sectional view showing one embodiment of the present invention. In the glass-wrapped rectangular wire 1 of this embodiment, the outermost enameled wires 1a of the wire 1 are arranged at intervals, and the spaces between the wires are filled with a synthetic resin formed by heating and melting thermoplastic polyester. The material 2 is filled to bind each line in the outermost layer. As shown in FIG. 2, the synthetic resin filling 2 includes an enameled wire 1a as the outermost layer of the wire, and a thermoplastic polyester string 1b such as Tetron (trade name) string having the same diameter as the enameled wire 1a. The polyester strings 1b are alternately arranged and twisted, compression molded into a rectangular shape, and then heated to melt the polyester strings 1b. This polyester string 1b may be a monofilament or a multifilament, and may be replaced with another thermoplastic synthetic resin string if necessary. In the rectangular edge portion of the synthetic resin filler 2, the entire edge portion is rounded to reduce its sharpness. In the figure, reference numeral 3 indicates a horizontally wound glass yarn layer.

FIG. 3, in which parts common to FIGS. 1 and 2 are given the same reference numerals, shows another embodiment of the present invention.

In the embodiment shown in FIG. 3, the synthetic resin filling 2' is formed by compression molding the wire into a rectangular shape.
It is formed by impregnating the entire structure with an insulating varnish based on, for example, epoxy resin or polyester resin and then baking it.

Also in this example, this synthetic resin filling 2
has the effect of binding the lines together and reducing the sharpness of the edges.

In this embodiment, a cross-wound layer 3' of blended yarn of polyester and glass yarn is formed on the outer periphery, and a cross-wound layer 3 of glass yarn is further formed on the outer periphery, and the cross-wound layer 3' of blended yarn is heat-treated. The polyester threads are melted and the glass threads are bound together.

A suitable mixing ratio of the polyester yarn and the glass yarn in the blended yarn 3 is in the range of 7 to 4 glass yarns to 3 to 6 polyester yarns.

[Effect of the invention] As explained above, in the glass-wrapped rectangular wire of the invention, the insulating strands are bonded to each other by the synthetic resin filling, and the filling makes the edges rounded and sharpness is reduced. This reduces the chance of the glass thread breaking during horizontal winding or handling, and since the insulating strands are bonded to each other, there is no possibility of the glass thread losing its shape.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating a method of forming a synthetic resin filler in the same embodiment, and FIG. 3 is a cross-sectional view showing another embodiment of the present invention. FIG. 3 is a cross-sectional view showing an example. DESCRIPTION OF SYMBOLS 1...Glass-wrapped rectangular wire, 1a...Enameled wire, 1b...Polyester set, 2...Synthetic resin filling, 3...Glass thread horizontally wound layer, 3'...Blended yarn horizontally wound layer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A glass-wrapped rectangular wire made of twisted insulated wires is compression-molded into a rectangular shape, and a glass thread-wound layer is provided around the outer periphery of the glass-wrapped rectangular wire. A synthetic resin filler formed by heating and melting the material or applying and baking varnish binds the outermost insulating wires of the rectangular compression-molded wire to each other, and sharpens the edges of the rectangular shape. A glass-wrapped flat rectangular wire that is characterized by a moderate degree of strength. (2) The synthetic resin filling is formed by twisting thermoplastic synthetic resin strings together with insulating wires when twisting wires, forming them into a rectangular shape, and then heating and melting the thermoplastic resin strings. A glass-wrapped rectangular wire as claimed in claim 1 of the utility model registration. (3) The glass-wrapped rectangular Litsutsu wire as described in Claim 1 of the Utility Model Registration Claim, wherein the synthetic resin filling is formed by compression molding the Litsutsu wire into a rectangular shape and then impregnating and baking it with an insulating varnish. .