JPS5842109A - Method of producing communication cable unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides protection for a communication cable having a communication cable unit consisting of an assembly of a plurality of insulated core wires by spraying a heated melt of hot melt adhesive in a ring shape from the outer periphery of the unit. Regarding a method for manufacturing a communication cable unit characterized by forming a wrapped portion, the purpose thereof is to increase the manufacturing speed, reduce costs, and improve convenience in processing the installation and wiring of the product. be.

Conventionally, communication cables made of multiple insulated core wires were wrapped with various threads or tapes (B, B') around each unit (U) or the outer periphery of the unit bundle, horizontally wrapped with overlapping seams, or roughly wrapped. It was wrapped and bound.

However, when the cable is disconnected and laid and wired, when the cable is horizontally wound with overlapping seams, it is difficult to peel off the windings B and B' due to the relationship between the cutting part and the rear end of the cable. However, in the case of coarse winding, when multiple units are branched and used, it is necessary to expose a long length of the cable unit U from the cable sheath sh, and the wrapping of the cable unit U breaks and becomes incomplete. There was a risk that the identification between cable units would become unclear.

The present invention solves these problems by applying hot-melt adhesive hot-melt adhesive periodically around the outer periphery of the cable unit, which is a bundle of insulated core wires constituting the communication cable unit, in the length direction of the unit. By spraying and coating the cable unit, the wrapping of the cable unit can be easily done, and the entire manufacturing process can be realized at high speed.The manufacturing method of the communication cable unit y) has good flexibility and is highly convenient when processing the installation and wiring of the product. It provides: Hereinafter, the configuration and the like will be explained in detail with reference to an embodiment shown in the drawings.

FIG. 2(a) shows a cross section of an embodiment of a communication cable unit according to the present invention, and FIGS. 2(b) and (,) similarly show a perspective view of the external appearance. 1zFc>, t is an insulated core wire constituting the communication cable unit, R is a ring-shaped wrapping part that presses the insulated core wire t and is made of hot melt adhesive, and S is a groove provided in the ring-shaped wrap part R to hold the cable. This is the trigger for dismantling and dividing U (see Figure 2(c)).

/ Figures 3(,) and (b) are diagrams for explaining an embodiment of the method for manufacturing a communication cable unit according to the present invention, and Figure 3(a) shows the external dimensions of the main parts of the manufacturing equipment. Figure, Figure 3(b)
is also a longitudinal sectional view of the main part. In the figure, L is an insulated core wire, N is a tank (not shown), and a heated melt M of hot melt adhesive fed through an armature and a feeding control unit is intermittently applied to the outer periphery of a bundle of insulated core wires T. In general, spraying is a nozzle for coating, and F is a frame that fixes the position of a plurality of nozzles N so that the heated melt M forms a ring-shaped wrapping portion R around the outer periphery of the bundle of insulated core wires t. D is a shaping section made of a heated shredder or a roll. As shown in Fig. 3(c), hot melt adhesive M is sprayed on the outer periphery of the bundle of insulated core wires t.
After solidifying into a ring shape, the layer of the ring-shaped wrapping part R has irregularities on the surface and its length in the longitudinal direction is uneven, and the fracture strength of the bonded part also varies greatly. In order to smooth and average this, the ring-shaped layer of the hot melt adhesive M is crushed and averaged by the shaping part to form a shaped ring-shaped wrapping part R. If the shaping part is not heated here, the hot-melt adhesive will be cooled and solidified, causing blur and scum, making it impossible to form a smooth annular wrapping part R consisting of an adhesive layer.

Next, I will explain the effect. A plurality of aggregates of insulated core wires t are traveling at a predetermined speed on a conveyor line, and a plurality of nozzles N fixed to a frame F are placed on the outer periphery of the aggregates under the control of a feed control unit (not shown). When the melt of the hot melt adhesive M is intermittently sprayed at a specific period, the surface of the insulated core wire t is covered with a ring-shaped envelope made of the hot melt adhesive M periodically in the length direction of the communication cable unit. Part R is crudely produced. Next, the surface is smoothed and smoothed by the shaping part, and the wrapping of the communication cable unit is completed by the annular wrapping part R made of hot melt adhesive M°.

Here, the nozzle 'N, the shaping portion, etc. will be further examined. As can be seen in Figure 3 (,), in order to spray the heated melt of hot melt adhesive M in a ring shape intermittently in the unit length direction on the outer periphery of the communication cable unit, a number of layers are applied in the unit circumferential direction. A nozzle N is provided on the frame F,
The hot melt adhesive M may be jetted simultaneously from several directions around the outer periphery of the unit. Further, the shape of the opening of the nozzle N may be arbitrary, or may be circular or rectangular.
The more locations the heated molten material is ejected from and the closer they are, the better the shape of the annular encasing portion R formed after being squeezed to the shaping portion becomes more uniform (see FIG. 3(C)).

Figures 4(a) to (d) show examples of the positional relationship between the nozzle N and frame F and the shape of the opening of the nozzle N. In particular, Figure 4(d) shows the nozzle N and frame F integrated into one. An example is shown in which the hot melt adhesive M has two feeding ports P, the nozzle N has four openings, and the frame F is shaped like a hollow doughnut.

The distance between the nozzle N that sprays and applies the hot melt adhesive M and the shaping section depends on the melting and solidifying characteristics of the hot melt adhesive M, the adhesion characteristics of the unit core wire to the insulating coating material, the speed of the conveyance line, and the applicable temperature. However, it is also possible to form the nozzle N, the frame F, and the shaping part integrally to form a single annular wrapping head, thereby simplifying the manufacturing process. This is illustrated in a partially cutaway front view, vertical cross-sectional view, and rear view in FIGS. 5(,) to (C), respectively. In the figure, N is a nozzle opening, P is a feeding port, H is a heater for heating the annular wrapping R made of hot melt adhesive M, and D is a shaping part that determines the final shape of the annular wrapping. It is.

In addition, if a protrusion S' is provided on the inner side of the edge of the shaping part,
A groove S as shown in FIGS. 2(a) and 2(b) can be formed on the surface of the annular encasing portion R.
As shown in Figure (c), the unit can be separated by bare hands from the groove S, and even if the unit U is divided and disassembled, it will not be immediately separated into strands as in the conventional method, but it can be hot-melted to a considerable extent. Grouping is maintained by the binding force of the adhesive.

As is clear from the above description, according to the present invention, when manufacturing a communication cable unit, a melted hot melt adhesive is applied by spraying to the outer periphery of a bundle of insulated core wires in the length direction. , there is no need to press and wrap the cable unit with tape or rice grains, which increases production speed and reduces costs.The supply of highly flexible communication cable units and the process of laying and wiring them. Convenience, for example, distinguishability between units obtained by applying different colors or markings to the hot melt adhesive itself or the surface of the ring-shaped wrapping part R for each cable unit, ease of processing the wrapping, etc. bring improvement. In particular, by providing grooves in the length direction of the unit in a part of the surface of the annular wrapping portion R to facilitate breaking of the wrapping, the effect can be extremely significant when applied to the manufacturing of communication cable units. It is something.

Note that if the hot melt adhesive is ejected from the nozzle continuously rather than periodically and intermittently, and if the temperature, viscosity, nozzle opening, and conveyance speed of the melt are appropriately controlled, a cheap envelopment can be achieved instead of a ring shape. is also possible.

[Brief explanation of the drawing]

Figures 1(a), (c) are cross-sectional views showing the structure of a conventional communication cable, Figure 1(b) is an external perspective view of a conventional communication cable unit, and Figures 2(a), (b), (
e) is a partially broken sectional view showing the configuration of the communication cable unit according to the present invention and an explanatory view of the external appearance, FIG.
(b) is an external perspective view and a vertical sectional view of one embodiment showing the manufacturing process according to the present invention, FIG. 3(c) is an external view of the communication cable unit, and FIGS. 4(,) to (d) are 1 is a diagram showing the configuration of an embodiment of a nozzle used in the present invention. Figure 5 (,)
- (c) are a partially cutaway front view, a longitudinal cross-sectional view, and a rear view for explaining an example in which everything from a nozzle to a shaping section used in the present invention is integrated. T: Cord wire, R: Annular wrapping made of hot melt adhesive M, S: Groove, N: Nozzle (opening), P
... Feeding port, F... Frame, D... Shaping section, S
I...Protrusion provided on the inner side of the shaping part to create the groove S. Patent Applicant Nippon Telegraph and Telephone Public Corporation Figure 1 (b) ρ' Figure 2 (b) (C) Figure 3 (C) Around 31) Stomach Surika 1 Figure 4 (Q) cb) (Q) 5 Diagram (C)

Claims (1)

[Claims] A process of periodically spraying a heated melt of hot melt adhesive from the outer periphery of a communication cable unit having an assembly of a plurality of insulated core wires in the length direction of the unit, and assimilation adhesion of the hot melt adhesive. A method for manufacturing a communication cable unit, comprising the step of shaping the resulting ring-shaped wrapping part with a ring-shaped heating shaping part provided with projections on the inner side to complete wrapping of the communication cable unit.