Aluminum foil special for outer layer of three-shield coaxial cable

Abstract

The invention relates to an aluminum foil special for an outer layer of a three-shield coaxial cable. The aluminum foil comprises a first aluminum foil layer, a second aluminum foil layer, a first plastic reinforcement layer and a second plastic reinforcement layer, wherein the first aluminum foil layer, the first plastic reinforcement layer, the second aluminum foil layer and the second plastic reinforcement layer are arranged sequentially; and adjacent layers are compounded into a whole body by glue. A second polyester (PET) film layer which directly contacts an outer jacket is compounded on the outer side of the second aluminum foil layer, so that friction force and combination force between the aluminum foil special for the outer layer and the outer jacket are increased, relative slide between the outer jacket and the aluminum foil special for the outer layer is avoided, and the stability of a product structure and the stability of electrical performance are improved. The aluminum foil special for the outer layer is closely combined with the outer jacket, stripping heads are easy to separate, and technical routes, such as a bonding principle and the like, used in the past are wrong. The traditional concept is broken by the technology, and the common problem in the industry is radically solved by applying a physical adsorption mechanism to the aluminum foil special for the outer layer and the outer jacket.

Description

(1) Technical field [0001] The invention relates to a special aluminum foil for the outer layer of the satellite TV and cable wire three-shield coaxial cable. (2) Background technology [0002] Generally speaking, the basic composite structure of the outer conductor of the physically foamed cable television triple-shielded coaxial cable is: aluminum foil longitudinal wrap (inner layer) + aluminum-magnesium alloy wire braid (second layer) + aluminum foil longitudinal wrap (outer layer), inner layer The aluminum foil is double-sided self-adhesive aluminum foil, and the outer aluminum foil is double-sided aluminum foil. This structure is currently the most commonly used form. Technical literature at home and abroad shows that the design and manufacture of the existing three-shielded cable television coaxial cable has the following deficiencies: 1. When the outer double-sided aluminum foil is longitudinally wrapped in the sheath, the aluminum foil is prone to "starting" phenome...

AI Technical Summary

Problems solved by technology

Domestic and foreign technical literature shows that the design and manufacture of the existing three-shielded cable TV coaxial cable has the following deficiencies: 1. When the outer layer of double-sided aluminum foil is longitudinally wrapped in the sheath, the aluminum foil is prone to "starting" phenomenon, which leads to The thinnest point of the sheath at the "starting line" is unqualified, resulting in a large waste of quality; 2. After the cable is finished, the process requires that there should be no sliding between the sheath and the outer aluminum foil, and the customer requires that the sheath and the outer aluminum foil It must be tightly combined, but it should be easy to separate when stripping the head, which brings great difficulty to the design and manufacture of the three-shielded coaxial cable, which is also a common problem faced by the three-shielded cable television coaxial cable industry; 3. When the ordinary double-sided aluminum foil is produced in the sheath process, due to the high temperature when the sheath is extruded, a lot of heat is brought, and the aluminum foil is easily broken when it is heated and softened, which affects product quality and production efficiency, and also produces a lot of waste.

Through research, sampling, testing and analysis, our company found that the pass rate of the above-mentioned requirements for the domestic three-shielded cable TV coaxial cable is not high.

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