JPS5810255Y2 - Oshidashihi Fukuyo Nitsupuru - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nipple for extrusion coating, and aims to provide a nipple that is particularly suitable for extrusion coating of thin wires.

As shown in FIG. 1, when the diameter of the wire to be coated is 0.08φ, the diameter of the tip of the through hole a for extrusion coating must be about 0.1φ, as shown in FIG. Moreover, a long land length is required in view of surface roughness of the product to be extrusion coated.

However, this type of nipple A is manufactured entirely by machining, so it has a thin and highly precise through hole a as shown above.
It is difficult to drill for a long time.

Also, if the finished outer diameter of the extruded coated wire is small and the withdrawal rate is small, the wall thickness at the tip of the nipple will be extremely thin, so the through hole a should be formed with a large diameter and a separate It is also difficult to embed a small hole having a diameter of about 0.1φ.

Therefore, it is often difficult to coat thin wires using the pipe extrusion method using conventional nipples.

Although the extrusion coating using the solid method does not have many problems in processing the nipple, it has the disadvantage that the adhesion strength between the strands and the coating plastic is too strong, making it impossible to satisfy specifications in terms of peeling.

The present invention aims to solve these difficulties, and to explain this in detail based on the illustrated embodiment, as shown in Figure 2 and below, the entire length of the through hole 2 in the nipple body 1 for extrusion coating is A metal pipe 3 is installed inside.

In order to install the pipe 3 internally, the outer diameter of the pipe 3 is formed to be equal to or slightly smaller than the inner diameter of the tip of the through hole 2.
The nipple body 1 is inserted into the nipple body 1 and fixed at both longitudinal ends of the nipple body 1 by means such as brazing or the like.

Next, the tip part 4 of the nipple body 1 is pressed by machining to form it into the required dimensions, and if the hole diameter of the inlet part 5 in the nipple body 1 is too large than the outer diameter of the pipe 3, the pipe 3 The pipe 3 is fixed to the nipple body 1 by disposing an intervening member 6 between the nipple body 1 and the through-hole surface 1' of the nipple body 1.

3 shows a case where the tip 4 of the nipple body 1 is smaller than the outer diameter of the pipe 3, and the pipe 3 is made to protrude from the tip 4.

The pipe 3 may be formed into a desired size by using a drawing die or the like.

In the figure, 7 indicates a slit.

As explained above, according to the present invention, a pipe 3 having a uniformly small diameter is installed over the entire length of the through hole 2 in the nipple body 1 for extrusion coating of a thin wire.
It is characterized in that the substantial inner diameter of the through hole 2 is a non-tapered small diameter, and the nipple body 1 and the pipe 3 are fixed to each other.

That is, in the present invention, since the pipe 3 is installed inside the through hole 2 of the nipple body 1, the substantial inside diameter of the through hole 2 is the inside diameter of the pipe 3, and therefore, unlike the conventional nipple body 1.
Since there is no need to form a small-diameter through hole in the main body 1, the processing of the main body 1 is facilitated, and the difficulty in drilling the hole is eliminated.

Further, the tip portion 4 can be easily processed using a machine or the like, and the length of the land can be freely processed according to the resin to be extruded, so that a coated product with a clean finished surface can be obtained.

Of course, the nipple body 1 and the pipe 3 are fixed to each other, and the pipe 3 is not rotated during extrusion coating of the thin wire, so the thin wire will not be twisted and no undesirable problems will occur.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional nipple, Fig. 2 is a sectional view of a nipple according to the present invention, Fig. 3 is a partial sectional view showing the other side of the nipple, and Fig. 4 is the right side of Fig. 1. It is a diagram. 1...Nipple body, 2...Through hole, 3
······pipe.

Claims (1)

[Scope of utility model registration request] A pipe with a uniformly small diameter is installed throughout the entire length of the nipple body, which is used for extrusion coating of thin wire.
A thin wire extrusion coating nipple, in which the substantial inner diameter of the through hole is a non-tapered small diameter through the pipe, and the nipple body and the pipe are fixed to each other.