JPS6123610B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a laminate sheathed cable.

For the purpose of electromagnetic shielding or waterproofing of electrical cables, the cable core is covered with laminated tape, that is, a tape in which plastic tape is laminated on one or both sides of metal tape, and a plastic sheath is extruded on the outside of this tape. Laminated sheathed cables are known.

An example of a method for manufacturing this cable is shown in FIG. 1. That is, a metal tape 1, for example an aluminum tape, and a plastic tape 2, for example a polyethylene tape, are each delivered separately from each tape pad. After the metal tape 1 is heated by a heating means 10, for example a heating roll, a plastic tape is continuously brought into contact with the surface of the metal tape and is pressed by a pressure roll 11. In this way, metal tape 1
On the other hand, plastic tape 2 is integrally laminated by heat fusion to form a laminate tape 3.

This laminate tape 3 is then cooled by contacting it with a cooling device 4, for example a roll in which cooling water is circulated. The purpose of cooling the laminate tape is in the vertical splicing process described below.
Alternatively, this is to prevent the plastic tape 2 from peeling off from the metal tape 1 during the extrusion coating process of the plastic sheath.

Next, the laminated tape 3 is placed in a vertical splicing forming machine 1.
2 and is vertically spliced and wrapped around the cable core 5, then sent to an extrusion molding machine 13,
The plastic sheath 6 is designed to be extrusion coated. In addition, 14 is a dancer roll device,
15 is a metal tape pad, 16 is a plastic tape pad, and 17 is a guide roll.

However, in the above-mentioned method, the following inconvenience occurs when the laminate tape is cooled with a cooling device. That is, cooling water is circulated inside the cooling roll that constitutes the cooling device, and therefore the surface temperature of the cooling roll is maintained at 15°C to 20°C. However, when the environmental conditions at the work site are hot and humid, for example in summer, dew forms on the surface of the cooling roll, and this dew adheres to the laminate tape. If a laminate tape with dew attached to it is used as it is, the dew will turn into vapor when the plastic sheath is extruded and coated, resulting in a disadvantage that the appearance of the plastic sheath will be significantly impaired.

The object of the present invention is to provide a method for manufacturing a laminated sheathed cable that eliminates the above-mentioned drawbacks.

Next, the present invention will be explained in detail using illustrated examples. FIGS. 2 and 3 show a cooling device used in carrying out the present invention, in which a plurality of hollow cylindrical cooling rolls 15 are rotatably supported parallel to each other. Cooling water is circulated and supplied to the inside of the cooling roll 15 via a rotary joint 16 attached to its spindle as shown by the arrow. Further, these cooling rolls 15 are shielded from the outside air by a cover 7. The cover 7 is provided with an air supply hole 8A and an exhaust hole 8b for dry and relatively low-temperature dry gas A, and an inlet 9A and an outlet 9B for the laminate tape 3, respectively.

Therefore, the dry gas A at a relatively low temperature is circulated within the cover 7, and the cover 7
By cooling the laminate tape 3 while maintaining an atmosphere free from condensation, no condensation will form on the surface of the cooling roll even if the environmental conditions at the work site are hot and humid. If the width of the plastic tape is wider than the width of the metal tape, as shown in FIGS. 4 and 5, the side edges 2A and 2B of the plastic tape should be may be folded back onto the back side of the metal tape and pressed with a roll 17, or the side edges 2A, 2B may be cut off with a roll 18.

According to this invention, after the metal tape 1 and the plastic tape 2 are thermally welded to form the laminate tape 3, the laminate tape 3 is immediately cooled in an atmosphere without condensation, so that water droplets are not formed on the surface of the cooling roll. This prevents this from adhering to the laminate tape, and furthermore, by appropriately selecting various thermodynamic elements of the gas supplied into the cover 7 of the cooling device 4, such as temperature and degree of freshness, the cooling effect is improved. It has the effect of increasing line speed.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional manufacturing method, FIG. 2 is a cutaway front view showing a cooling device used in carrying out the present invention, and FIG. 3 is a plan view showing a state in which the cover is removed from FIG. 2. FIGS. 4 and 5 are plan views showing a method for treating the side edges of plastic tape. In the figure, 1 is a metal tape, 2 is a plastic tape, 3 is a laminated tape, 4 is a cooling device, 5 is a cable core, 6 is a plastic sheath, 7 is a cover, 8A is an air supply hole, 8B is an exhaust hole,
9A is an inlet of the laminated tape, 9B is an outlet of the laminated tape, 15 is a cooling roll, and 16 is a rotary joint.

Claims (1)

[Claims] 1 After sending out the metal tape 1 and the plastic tape 2 separately and preheating the metal tape, the plastic tape is laminated on the metal tape and heat-sealed to each other to form the laminate tape 3, and then the laminate is immediately Tape cooling device 4
This is then cooled by cable core 5.
In the manufacturing method of a laminate sheath cable, in which the cooling device 4 is covered with a cover 7 and dry gas is supplied into the cover, the surface of the cooling roll is A method for manufacturing a laminated sheathed cable, characterized by maintaining an atmosphere free from condensation.