Polaris Cable Network News: World cable materials development situation and development trend In recent years, the world was sustained growth in the state of cable products, the fastest growing in the Americas. North American cable product yield of about 26% of world production. Cable in the world the largest share of total production is low-voltage wire and cable and power industry, accounting for 36% of the total. Followed by high-voltage cables, respectively, accounting for 28% of the total; around the envelope about 20% of the total; outdoor laying copper communications cable, accounting for 9% of the total; computer cables and other types of buildings internal communications cable, about 7% of the total. Output from the production point of view cable, fiber optic cable and computer cable, accounting for about 25.4% of the total, of which the total optical fiber and cable account for about 8.9%.
From the growth point of view, the fastest growth in the fiber optic cable: It CahnersIn-Star Group's research report, fiber optic cable is very promising, in 2005, will be the average annual growth rate of 23% just after the fiber computer cables and cable laying indoor communication cable, power cable to maintain a small steady growth. World As the world cable industry, cable corresponding to the above requirements of various cable materials is also growing.
1.1PE cable material
Abroad as early as the 1940s will be PE for communication cables. In the late 1990s, PE cable already in the PE products occupy an important position. In recent years, With the voice of the environmental improvement of the international community is gradually replaced with PE PVC, making PE cable resin material consumption increased every year.
1.1.1PE communication cable high-speed extrusion materials
At present, there is typically a high-density polyethylene (HDPE) or medium density polyethylene (MDPE) for communication insulating material. HDPE mechanical strength and electrical properties are better, especially with high toughness, the use of fully meet the requirements of the insulation material. Since the mid-7O, telephone cable insulation has been largely used HDPE [2].
1.1.2 cross-linked PE cable material
Power cable positive direction of the continuous development of cross-linked PE. At present, the international pressure from the lower cable 1kV, 6.35kV to 110kV cables in low-pressure high-pressure cables tend to use cross-linked PE. PE International Union turned over to the main production technology three main categories: radiation cross-linking produces electrical equipment cable; silane as a crosslinking silane crosslinking agent in the catalyst so that cross-linked PE; chemical cross-linking to low-density polyethylene (LDPE) as base material, an organic peroxide cross-linking agent, suitable for high temperature, high pressure, high frequency cables used under other conditions, can produce 6-35kV, 35.110kV in the high-voltage cables, air cables, control cables, etc. , its production technology mainly invented by the United States and promote the use of GE.
1.1.3 retardant material PE cable
The early 1980s, foreign countries have developed a low smoke zero halogen flame retardant cable materials. By the late 1980s, has developed a second-generation wire and cable with halogen-free flame-retardant plastic. Compared with the first generation, second generation of halogen-free flame-retardant plastics in addition to flame retardant, smoke, toxicity, corrosion, mechanical properties, electrical properties have been improved, the performance of its high-speed extrusion is a major feature .
Every year, Japan enacted 5O pieces of material with halogen-free flame retardant cable-related patents. Most of these patents are Hitachi Cable, Ltd., Japan, Union Carbide Corporation and Fujikura, Sumitomo, Japan and other big cable companies. Such patent attempt to use different methods to solve non-halogen flame retardant cable compounds the central issue, namely, flame retardancy and other properties to overcome the contradictions, the overall balance of performance; another lot of patents with the agent is committed to the development of new , in which magnesium hydroxide is a very important ingredients. patented in many countries, recommended by many authoritative literature abroad
1.1.4 shielded cable material
Shielded cable material is used to protect cable insulation layer is not destroyed the main semi-conductive composite material. According to IEC502 requirements, the rated voltage 1.8/3.0kV above and using PVC, ethylene-propylene rubber insulated cables, rated voltage 3.6/6.0kV must be used inside and outside the semi-conductive shielding layer.