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A kind of method for preparing tight sheath coaxial cable

A technology of coaxial cable and sheath, which is applied in the field of coaxial cable with tight sheath and its preparation, can solve the problems that the outer conductor enters the gap of moisture or moisture, affects the transmission performance and life of the cable, shortens the service life of the cable, etc., and achieves The structure of the sheath is stable, the effect of improving the return loss and reducing the attenuation parameter

Active Publication Date: 2016-05-18
ZHEJIANG TIANJIE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the high-frequency transmission network, the surface state of the outer conductor has a great influence on the high-frequency transmission effect and signal shielding interference. Even if the qualified outer conductor is used in the cable, the intrusion of moisture will cause the outer conductor to oxidize and affect the cable. Transmission performance and life
The outer sheath of the physically foamed polyethylene insulated coaxial cable is produced by conventional casing extrusion, and the adhesion of the sheath is between 30-40N; the outer sheath is produced by conventional semi-extrusion extrusion, and the sheath The adhesion force is between 50-60N; but these two sheath structure extrusion production methods are easy to cause the braid layer to loose, especially in the process of product circulation or product laying and installation, it is easy to cause relative displacement between the outer conductor and the sheath layer. Form a gap that can enter moisture or moisture, and oxidize the surface of the outer conductor, affect the transmission performance, and shorten the service life of the cable
The outer sheath is produced by extruding, and the adhesion of the sheath is between 70-90N. Although it can prevent the migration of moisture and moisture, the sheath consumes too much material, and the appearance of the sheath is concave, and the braided outer conductor is affected. Extruded into the insulation layer to cause defects such as insulation performance, resulting in unstable transmission performance and short life

Method used

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  • A kind of method for preparing tight sheath coaxial cable
  • A kind of method for preparing tight sheath coaxial cable
  • A kind of method for preparing tight sheath coaxial cable

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0028] Refer to attached figure 1 , a coaxial cable with a tight sheath, which is formed by extrusion coating of an inner conductor 31, an insulating layer, an outer conductor and an outer sheath 36, and the inner conductor, the insulating layer, the outer conductor and the outer sheath are sequentially arranged along the radial direction Arranged from the inside to the outside, the insulating layer is composed of an inner thin layer 32 and a foamed insulating layer 33, the inner thin layer is arranged outside the inner conductor and closely bonded with the inner conductor, the foamed The insulating layer is arranged between the inner thin layer and the outer conductor, and is bonded together with the inner thin layer. The outer conductor is composed of a self-adhesive aluminum foil 34 and a braided layer 35. The outer sheath is made of PVC or PE material is extruded through a zigzag extrusion die.

[0029] Refer to attached Figure 2-6 , a method for preparing a coaxial cab...

Embodiment 2

[0042] In step 2, the RG6 braided wire semi-finished product passes through the heater heating wheel, the heating temperature is set at 95°C according to the structure of the standard braided wire semi-finished product, and the extrusion production speed is 7km / h, so that the quality of the heated braided wire semi-finished product is the same as that of extrusion Match the plastic speed.

[0043] When the braided wire semi-finished product has a four-shielded structure, the heating temperature of the braided wire semi-finished product is 105°C, and the extrusion speed is 7km / h, so that the quality of the heated braided wire semi-finished product matches the extrusion speed, and the others are the same as in the first embodiment.

Embodiment 3

[0045] In step 2, the RG11 braided wire semi-finished product passes through the heater to heat the guide wheel. According to the structure of the standard braided wire, the heating temperature is set to 110°C, and the extrusion production speed is 6km / h, so that the quality of the heated braided wire semi-finished product Plastic speed matches, other is with embodiment one.

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Abstract

Disclosed are a coaxial cable with a tight sheath and a manufacturing method of the coaxial cable with the tight sheath. The coaxial cable is formed by an inner conductor, an insulating layer, an outer conductor and the outer sheath in an extrusion molding and wrapping mode. The inner conductor, the insulating layer, the outer conductor and the outer sheath are sequentially arranged from inside to outside in the radial direction, the insulating layer is composed of an inner thin layer and a foam insulating layer, the inner thin layer is arranged outside the inner conductor and tightly bonded with the inner conductor, the foam insulating layer is arranged outside the inner thin layer and the outer conductor and bonded with the inner thin layer to form a whole, the outer conductor is composed of a woven layer and a self-adhesion aluminum foil, and the outer sheath is formed by extruding a PVC / PE material through a zigzag extrusion die. According to the coaxial cable with the tight sheath and the manufacturing method of the coaxial cable with the tight sheath, after a braided wire semi-finished product is heated by a heater, the aluminum foil and the insulating layer are bonded and closed to prevent moisture from invading, meanwhile, the performance stability of the braided wire semi-finished product is guaranteed, attenuation parameters are reduced, and return loss is improved; the bore diameter of an inner die pipe sleeve is 1.5-2.5 times the diameter of the braided wire, and therefore the phenomenon that the cable is eccentric due to the fact the braded wire shakes severely after entering an inner die is avoided.

Description

(1) Technical field [0001] The invention relates to a tightly sheathed coaxial cable and a preparation method thereof. (2) Background technology [0002] Coaxial cables are generally mainly composed of inner conductors, insulating layers, outer conductors and outer sheaths, especially the fourth-generation products --- physical foamed polyethylene insulated coaxial cables, because of their environmental pollution and high foaming , good flexibility, small attenuation constant and stable transmission performance have been widely used. However, in the high-frequency transmission network, the surface state of the outer conductor has a great influence on the high-frequency transmission effect and signal shielding interference. Even if the qualified outer conductor is used in the cable, the intrusion of moisture will cause the outer conductor to oxidize and affect the cable. transmission performance and lifespan. The outer sheath of the physically foamed polyethylene insulated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B9/04H01B7/17H01B7/28H01B7/282H01B13/24H01B13/32H01B13/00
Inventor 帅平跃李明星陈铁洪杜柏林陈晓霖陈参波
Owner ZHEJIANG TIANJIE IND