JPH0729433A - Manufacture of preventing hydrotaxis cable and rotary pressure connecting roller device used in this method - Google Patents

Abstract

PURPOSE:To provide an inexpensive preventing hydrotaxis cable with high quality without using a PE (polyethylene) film in the overlap part of a laminate aluminium tape. CONSTITUTION:A laminate aluminium tape 2 having a plastic thin film preliminarily formed on one surface is vertically laid along and molded on the outer circumference of a cable core 1, and the overlap part of the laminate aluminium tape 2 is heated and adhered. To a cable 21 having the adhered overlap part and moving in the axial direction on a manufacture line, the outer circumference of the cable 21 is pressed by a pressure connecting roller while rotating the roller, and a slope line-like adhesion reinforcing line 22 is formed on the overlap part at a pitch P. Thereafter, a PE sheath is formed on the outside of the laminate aluminium tape 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a running prevention cable in which a cable core is provided with a laminated aluminum tape and a polyethylene sheath, and a rotary pressure roller device used in this method.

[0002]

2. Description of the Related Art A running prevention cable used for a conventional communication cable or the like has a structure shown in FIG. 4, in which a laminated aluminum tape 2 is vertically formed around a cable core 1 and then a laminated aluminum tape 2 is formed. The outer periphery is covered with a polyethylene sheath (PE sheath) 3 and integrated. A thin film layer of plastic is formed on both sides of the laminated aluminum tape 2 in advance, and a low melting point polyethylene film (PE film) is formed on the overlapped portion of the laminated aluminum tape 2 to prevent water running from the overlapped portion. 4 is attached vertically to enhance the adhesiveness.

The water running prevention cable having the above structure is manufactured on the manufacturing line shown in FIG. The cable core 1 is sent from the cable core feeder 5 to the laminated aluminum tape forming device 7. In the laminated aluminum tape forming device 7, the laminated aluminum tape 2 sent from the laminated aluminum tape feeder 6 is vertically attached to the periphery of the cable core 1 and is sandwiched between the laminated portions of the laminated aluminum tape 2 by PE. The film 4 is vertically attached and molded. Next, the cable is heated by the overlap bonding device 8 to bond the overlapping part of the laminated aluminum tape 2 with the PE film 4. After that, a PE sheath is applied on the laminated aluminum tape 2 by the extruder 9, cooled in the cooling water tank 10, and then the running water prevention cable is wound by the winder 12 via the take-up machine 11.

[0004]

The conventional water running prevention cable shown in FIG. 4 has a low melting point PE film 4 vertically attached to the overlapped portion of the laminated aluminum tape 2 in order to prevent water running. There are the following problems.

(1) Use of PE film 4,
Also, in order to improve this adhesiveness, the laminated aluminum tape 2 having a plastic thin film layer pre-formed on both sides must be used, which increases the material cost of the water running prevention cable by about 20%.

(2) Further, in order to completely vertically attach the PE film 4 to the overlapped portion of the laminated aluminum tape 2, the production line speed must be reduced by 30%, resulting in poor productivity.

(3) Further, when the PE film 4 is vertically attached, dust may be accumulated on the cable core, which may cause a defective sheath appearance, which requires repair or the like, resulting in an increase in cost.

An object of the present invention is to provide a method for producing a running-prevention cable capable of producing a high-quality and inexpensive running-prevention cable without using a polyethylene film in a laminated aluminum tape wrap portion, and a rotary pressure bonding roller used in this method. To provide a device.

[0009]

According to the method of manufacturing a water-running prevention cable of the present invention, a laminate aluminum tape having a plastic thin film layer pre-formed on one side thereof is vertically attached to the outer periphery of a cable core to form the laminate. The aluminum tape wrap portion was adhered by heating, and the roller was pressed to the above-mentioned overlap portion at an appropriate interval in a slanted line shape so as to cross the overlap portion, and then a polyethylene sheath was formed on the outer periphery of the above laminated aluminum tape. It is a thing.

Further, in the rotary pressure bonding roller device used in the above-described manufacturing method, a laminated aluminum tape having a plastic thin film layer formed in advance on one surface is vertically attached to the outer periphery of the cable core, and the overlapping portion of the laminated aluminum tape is formed. A holder that is provided on the running water prevention cable manufacturing line after being bonded by heating, and that rotates the outer circumference of the cable coated with the laminated aluminum tape that is sent on this line, and this holder And a pressure roller that presses the cable while being supported.

[0011]

[Function] The laminated aluminum tape is overlapped with the outer circumference of the cable core sent to the manufacturing line, and is vertically formed. Next, the plastic thin film layer of the laminated aluminum tape is melted by heating, and the overlapping portion of the laminated aluminum tape is bonded. Further, the roller is pressed so as to traverse the overlap portion in a slanted line shape, thereby forming an adhesion strengthening line in which the adhesive force is strengthened in a slanted line shape at appropriate intervals in the overlapped portion of the laminated aluminum tape. After that, the outer periphery of the laminated aluminum tape is covered with a polyethylene sheath to form a composite sheath in which the laminated aluminum tape and the polyethylene sheath are integrated with the cable core.

A rotary pressure roller device is used to press the roller against the overlapped portion of the laminated aluminum tape. On the manufacturing line, the cable is fed in the axial direction of the cable, while the pressure roller supported by the holder rotating around the outer circumference of the cable presses the cable in the axial direction. As a result, the pressure roller is pressed against the cable in a spiral shape at an appropriate pitch, and oblique line-shaped adhesion strengthening lines are formed at appropriate intervals in the overlapping portion of the laminated aluminum tape.

[0013]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a production line for running water prevention cables. In the production line from the cable core feeder 5 to the winder 12, a laminated aluminum tape molding device 7, an overlap bonding device 8, a rotary pressure bonding roller device 13, an extruder 9, a cooling water tank 10 and a take-up device 11 are sequentially installed. Has been done. To the laminated aluminum tape molding device 7, the cable core 1 is delivered from the cable core delivery device 5, and the laminated aluminum tape 2 having a plastic thin film layer formed on one surface from the laminated aluminum tape delivery device 6
Is sent, and the laminated aluminum tape 2 is vertically attached and molded around the cable core 1. Next, the plastic film layer of the laminated aluminum tape 2 is melted by heating with the overlap bonding device 8,
Adhere the overlapped part of the laminated aluminum tape 2.

Immediately after that, as will be described later in detail, the pressure roller is pressed against the overlapping portion of the laminated aluminum tape 2 in a diagonal line shape to strengthen the adhesion. Next, a PE sheath is applied to the outer periphery of the laminated aluminum tape 2 by the extruder 9, and the cooling water tank 10
After cooling through, the sheathed cable is wound on the winder 12 via the winder 11.

FIG. 3 shows the details of the rotary pressure roller device 13. As shown in the figure, the cable 21 to which the overlapping portion of the laminated aluminum tape 2 is bonded is arranged so as to pass through the center hole of the disk-shaped holder 20 and be delivered. A pulley 17a is attached to one side surface of the holder 20, and the holder 20 is rotated around a cable 21 via a pulley 17b and a belt 18 by driving the pulley 17a and a motor 19. In addition,
The holder 20 can rotate in both directions by the forward and reverse rotations of the motor 19. On the other side surface of the holder 20, the sizing roller 14 for guiding the cable 21 and the cable 2 are provided.
A pressure roller 15 for pressing 1 is rotatably attached. The diameter of the sizing roller 14 is the same as or slightly larger than the diameter of the laminated aluminum tape 2 on the outer circumference of the cable 21 (within 3 mm). The material of the sizing roller 14 is preferably one having heat resistance such as nylon, Teflon, or metal. The pressure roller 15 presses the axial direction of the cable 21 by the spring 16, but the pressing force of the spring 16 on the pressure roller 15 can be adjusted. The pressing force of the pressure roller 15 is 10 kgf.
The following is recommended. The material of the pressure roller 15 is
A material having elasticity and heat resistance such as silicone rubber is preferable, but a material having no elasticity may be used as long as it has heat resistance.

The holder 20 rotates around the cable 21 by driving the motor 19 of the rotary pressure roller device 13, and the sizing roller 14 and the pressure roller 15 also rotate as the holder 20 rotates. Then, the cable 21 sent from the overlap bonding device 8 is guided by the sizing roller 14 and protected while being pressed by the pressure bonding roller 15.
Receive pressure from. The cable 21 is fed in the axial direction, and the pressure roller 15 presses against the cable 21 at a fixed position, so that the cable 21 is moved as shown in FIG.
Therefore, the pressure roller 15 presses in a spiral shape with the pitch P. Therefore, in the overlapped portion of the laminated aluminum tape 2 on the outer peripheral portion of the cable 21, the adhesion strengthening line 22 in which the adhesion of the overlapped portion is strengthened is formed with a pitch P in a diagonal line shape. The pitch P of the adhesion strengthening wire 22 is set in the range of 10 mm to 3000 mm, and the rotation speed of the holder 20 is adjusted with respect to the delivery speed of the cable 21 or the manufacturing speed (10 to 40 m / min).

[0018]

As is apparent from the above description, the present invention has the following effects. (1) Since the crimping roller presses the overlapped portion of the laminated aluminum tape in a diagonal line shape at an appropriate interval along the cable in which the laminated aluminum tape is vertically attached, the adhesion of the overlapped portion is strengthened. Water running from the lap can be reliably prevented, and the quality of the water running prevention cable can be improved.

(2) The PE film can be omitted, and
The laminated aluminum tape with plastic thin film layers on both sides can be changed to a laminated aluminum tape with only one side, and the cost of materials can be reduced.

(3) Since it is not necessary to vertically attach the PE film, the production line speed can be increased by 30%.

(4) Since the PE film is not used, the appearance defect due to the cable core wire scrap is eliminated, and the cost increase due to the repair can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing a bonded state of an overlap portion of a laminated aluminum tape in a water running prevention cable according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a production line of a running water prevention cable according to an embodiment of the present invention.

FIG. 3 is a detailed view of a rotary pressure roller device according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing the structure of a conventional water running prevention cable.

FIG. 5 is a configuration diagram showing a conventional production line for a water running prevention cable.

[Explanation of symbols]

 1 Cable core 2 Laminated aluminum tape 21 Cable 22 Adhesion strengthening wire

Claims (2)

[Claims] 1. A laminated aluminum tape having a plastic thin film layer previously formed on one side thereof is vertically attached to the outer periphery of a cable core and molded, and the overlapped portion of the laminated aluminum tape is bonded by heating to form the overlapped portion. A method for producing a water-running prevention cable, characterized in that a roller is pressed at an appropriate interval in a diagonal line so as to cross it, and then a polyethylene sheath is formed on the outer periphery of the laminated aluminum tape. 2. A water running prevention cable manufacturing line after a laminated aluminum tape having a plastic thin film layer formed in advance on one side is vertically formed on the outer periphery of the cable core and the overlapping portion of the laminated aluminum tape is adhered by heating. And a holder for rotating and driving the outer periphery of the cable coated with the laminated aluminum tape, which is sent on the line, and a pressure roller for pressing the cable while being supported by the holder. A rotary pressure bonding roller device.