CN101783208A

CN101783208A - Television coaxial cable concealed in wall

Info

Publication number: CN101783208A
Application number: CN 201010129650
Authority: CN
Inventors: 谢榕辉
Original assignee: SHENZHEN SUIRONG COAXIAL CABLE CO Ltd
Current assignee: SHENZHEN SUIRONG COAXIAL CABLE CO Ltd
Priority date: 2010-03-20
Filing date: 2010-03-20
Publication date: 2010-07-21
Anticipated expiration: 2030-03-20
Also published as: CN101783208B

Abstract

The invention relates to a television coaxial cable concealed in wall with high performance and long service life. The television coaxial cable comprises a center conductor, an irradiation crosslinking foaming polyethylene insulating layer, a copper-plastic compound film or a copper foil shield layer, a copper wire braided outer conductor layer, and an irradiation crosslinking transparent polyethylene outer sheathing layer which are arranged in order from inside to outside. The insulating layer is formed by using polyethylene with high and low density combined with appropriate amount of nucleating agent to be foamed by a physical foaming machine for extruding insulating core wires which are then irradiated by an electron accelerator; the sheathing layer is formed by using a transparent PE material to produce a semitransparent PE outer restrictive coating through a cable sheath extruder and then be irradiated by the electron accelerator. Due to the function of high-voltage electron-beam current generated by the electron accelerator, the internal structures of the insulating layer and a transparent PE outer restrictive coating change from a former chain macromolecule structure to a three-dimensional net structure, thereby cable products have better physical property and bear high temperature of 110 DEG C, and the outer restrictive coating has the advantages of uneasy aging and long service life.

Description

A kind of television coaxial cable concealed in wall

Technical field:

The present invention relates to the coaxial cable that a kind of communication is used, especially a kind of have high performance and long service life and bury the television coaxial cable that wall is used.

Background technology:

Current television coaxial cable mostly adopts plastic-aluminum combined paper tinsel shielding, tinned copper wire or aluminum-magnesium alloy wire braided outer conductor and employing PVC oversheath etc., but because foil shielding layer is aging easily, the PVC restrictive coating is owing to add auxiliary agent, auxiliary agent disengages easily, cause screen oxidation and the embrittlement of oversheath ageing hardening, transmission performance is descended, shorten useful life.

Summary of the invention:

The objective of the invention is to overcome the shortcoming of existing television coaxial cable, a kind of transmission performance height is provided, the life-span is long, is applicable to that top grade decoration buries the television coaxial cable that wall is used.

The present invention comprises the center conductor that sets gradually from the inside to the outside; Radiation cross-linked and foamed polyethylene layer; Copper is moulded composite membrane or Copper Foil screen; Copper wire braided outer conductor layer; Cross-linking radiation transparent polyethylene external sheath layer.

The present invention, described radiation cross-linked and foamed polyethylene layer can be obtained by following method:

A) batching: high low density polyethylene (LDPE) 98.0～98.5%, nucleator 1.5～2.0%, wherein, high low density polyethylene (LDPE) is by high density polyethylene (HDPE) and low density polyethylene (LDPE) preparation in 1: 1 by weight;

B) high low density polyethylene (LDPE) and the nucleator with formula ratio mixes;

C) above-mentioned center conductor and material are foamed on physical blowing machine extrusion insulation heart yearn injects the nitrogen of 15MPa during the foaming extrusion, the foam degrees of polyethylene foamed insulating barrier is 50～60%;

D) the insulation heart yearn makes the generation of polyethylene foamed insulating barrier crosslinked through electron accelerator irradiation, and irradiation dose is 14mrd, and speed is 50～60 meters/minute.

The present invention, described cross-linking radiation transparent polyethylene external sheath layer can be obtained by following method:

A) select the clear PE material for use,

B) above-mentioned material is produced external sheath layer on the cable cover(ing) extruder, finish cable processing;

C) cable that will finish makes the external sheath layer generation crosslinked through electron accelerator irradiation again, and irradiation dose is 14mrd, and speed is 50～60 meters/minute.

The present invention has following advantage:

1, center conductor, screen and outer conductor all adopt former copper product, and metal of the same race is difficult for oxidation, and transmission performance is good, long service life;

2, insulating barrier is equipped with an amount of nucleator by high low density polyethylene (LDPE), through physical blowing machine foaming extrusion insulation heart yearn, by the polyethylene foamed insulating barrier of its generation again through electron accelerator irradiation, producing the high-pressure electronic line by electron accelerator acts on the polyethylene foamed insulating barrier, polyethylene foamed insulating barrier internal structure is changed, become tridimensional network by original chain macromolecule structure, thereby have better physical property after making the polyethylene foamed insulating barrier crosslinked.

3, restrictive coating is selected the clear PE material for use, produce translucent PE external sheath layer through the cable cover(ing) extruder, form coaxial cable, the coaxial cable that to finish again, through electron accelerator irradiation, producing the high-pressure electronic line by electron accelerator acts on the clear PE external sheath layer, make the clear PE oversheath layer by layer internal structure change, become tridimensional network by original chain macromolecule structure, thereby have better various physical properties after making the clear PE external sheath layer crosslinked, the high temperature of ability 110 degree, and cross-linking radiation transparent polyethylene external sheath layer is difficult for aging, being useful life more than 30 years, is the TV cable that top grade decoration is buried the wall first-selection.

Description of drawings:

Fig. 1 is a structure principle chart of the present invention.

Among the figure, 1, center conductor 2, radiation cross-linked and foamed polyethylene layer 3, copper mould composite membrane or Copper Foil screen 4, copper wire braided outer conductor layer 5, cross-linking radiation transparent polyethylene external sheath layer.

Embodiment:

With reference to Fig. 1, a kind of television coaxial cable concealed in wall (is example with model SYWV 75-5 (RG6)) comprises the center conductor 1 that sets gradually from the inside to the outside; Radiation cross-linked and foamed polyethylene layer 2; Copper is moulded composite membrane or Copper Foil screen 3; Copper wire braided outer conductor layer 4; Cross-linking radiation transparent polyethylene external sheath layer 5.Its operation comprises:

1, center conductor 1 is selected the fine copper unit heart yearn of φ 1mm for use,

2, make the insulation heart yearn:

A) batching (weight ratio): high density polyethylene (HDPE) 49.1%; Low density polyethylene (LDPE) 49.1%; Nucleator 1.8%, wherein: the product that high density polyethylene (HDPE) and low density polyethylene (LDPE) select for use LG-DOW chemical company to provide respectively, model are respectively 1253 and 6944, nucleator by Nanjing China all Scientific and Technical Industry Co., Ltd provide, model is: HD101;

C) above-mentioned center conductor 1 and material are foamed on physical blowing machine extrusion insulation heart yearn injects the nitrogen of 15MPa during the foaming extrusion, the foam degrees of polyethylene foamed insulating barrier is 50～60%; The external diameter of the insulation heart yearn after the extrusion is φ 4.8mm;

D) the insulation heart yearn makes the generation of polyethylene foamed insulating barrier crosslinked through electron accelerator irradiation, and electron accelerator is selected the electron accelerator of the U.S.'s that meter of import ground for use, and energy is 1.6MeV, and line 30mA, irradiation dose are 14mrd, and speed is 50～60 meters/minute.

3, on the insulation heart yearn, make screen 3 and outer conductor braid 4, screen is selected the thick Copper Foil of 0.020mm for use, outer conductor is selected the copper wire line of φ 0.12mm for use, finish the operation of Copper Foil screen 3 and outer conductor braid 4 on 16 ingot high-speed knitters simultaneously, 16 ingot high-speed knitters are existing common apparatus.

4, the processing of external sheath layer 5:

A) the FB3000 clear PE material of selecting for use LG Corp of South Korea to provide,

B) adopt cable cover(ing) extruder and above-mentioned FB3000 clear PE material, produce external sheath layer 5 on operation 3 completed outer conductor braids 4, finish cable processing, the cable external diameter is φ 6.8mm; The cable cover(ing) extruder is existing common apparatus;

C) cable that will finish makes external sheath layer 5 generations crosslinked through electron accelerator irradiation again, and electron accelerator is selected the electron accelerator of the U.S.'s that meter of import ground for use, and energy is 1.6MeV, and line 30mA, irradiation dose are 14mrd, and speed is 50～60 meters/minute.

Claims

1. a television coaxial cable concealed in wall is characterized in that: comprise the center conductor (1) that sets gradually from the inside to the outside; Radiation cross-linked and foamed polyethylene layer (2); Copper is moulded composite membrane or Copper Foil screen (3); Copper wire braided outer conductor layer (4); Cross-linking radiation transparent polyethylene external sheath layer (5).

2. television coaxial cable concealed in wall according to claim 2 is characterized in that: described radiation cross-linked and foamed polyethylene layer can be obtained by following method:

3. television coaxial cable concealed in wall according to claim 1 and 2 is characterized in that: described cross-linking radiation transparent polyethylene external sheath layer can be obtained by following method:

A) select the clear PE material for use,