Resolution: cross-linked polyethylene pipe production of the new trends – cross-
HC plastic mesh News: Hot and cold water in the building of plastic pipe, cross-linked polyethylene pipe is an important species, and the other two major varieties of the largest one is the current output PP-R Pipe. The other is plastic composite pipes. Hot and cold water pipes within the building there are many other varieties, such as: PE-RT, PB and so on. Cross-linked polyethylene pipe is mainly used for building hot water pipes, such as: domestic hot water pipes, heating pipes, low temperature hot water floor radiant heating pipes and so on. Cross-linked polyethylene pipe is building in Europe, the application of hot and cold water pipes largest species, to account for building hot and cold water plastic pipe market by 50%. As in recent years the development of China's low-temperature radiation heating the ground faster, so the development of cross-linked polyethylene pipe is relatively fast in recent years, annual output in 2006 reached 30,006 tons, of which peroxide crosslinked polyethylene pipe (PE-Xa ) to account for 30,000 tons. In 2007 the total will reach 40,000 tons, of which silane crosslinked polyethylene pipe will increase to 10,000 tons.
Our production of cross-linked polyethylene pipe is divided into silane cross-linked polyethylene pipe (PE-Xb) and peroxide crosslinked polyethylene (PE-Xa) pipes, only a small amount of radiation cross-linked polyethylene pipe ( PE-XC).
A silane cross-linked polyethylene pipe (PE-Xb)
In our cross-linked polyethylene pipe production first developed in the silane crosslinked polyethylene technology, the introduction, among the sub-technology and domestic technology. The introduction of technology is introduced in the late 90's in Switzerland, "NOKIA-MAILLEFER" production lines and technology, domestic at present a total of 10 such lines, with a total capacity of 070 million meters / year. The main characteristics of technology using high-pressure pump to process requests in accordance with the ratio of silane and additives directly into the Extruder Provisions barrel position to complete by the plasticizing screw extruder and the process of decentralization as well as graft and extrusion. As the formula more stringent control, and the basic or the use of these enterprises have imported Silane special grade high density polyethylene material, so the quality is stable, has long been a high-end cross-linked polyethylene pipe products, pipe market prices higher, close to the lap welding aluminum plastic composite pipe price. In recent years, "Nippo" and has developed a barrier layer with a silane cross-linked polyethylene pipe, is a step in co-extrusion with EVOH barrier layer, polyethylene pipe, the product has on a grade. This cross-linked polyethylene pipes are blocking the function of oxygen can extend the life of water heaters.
Silane cross-linked polyethylene pipe of the domestic technology another step and two-step distinction, emerging domestic 90 The main features of one-step technique is to use mixer to requirements in accordance with the proportion of resin formulations, silane, and help After the agent into the reactive mixture through the extruder pipe. As the silane and additives in the process of mixing and distribution losses is difficult to measure, so the general formula is designed to be more certain, not only cause costs to increase, also easily lead to fluctuations in product quality; and then there are not any special silane cross-linked polyethylene grade material, the pursuit of low cost, so most of the other levels using high-density polyethylene (such as drawing class 5000S) alternative, often have to add some Linear low density polyethylene (LLDPE) to improve its degree of crosslinking. Therefore, the product quality of domestic instability in one-step technique, and can not be compared to imported technology products. But this one-step cross-linked polyethylene pipe production line for investment and imports only one-step production line 1 / 20, so a considerable number of domestic social possession of equipment. In contrast with the one-step is the development of an earlier two-step cross-linked polyethylene pipe, is a good use of special pre-production two-step silane cross-linked polyethylene material (commonly referred to as A, B material, and is the aggregate) with ordinary polyethylene pipe production line pipe production line of this request is not too large aspect ratio (usually 28 or less), another to simply not have the mixing screw element, the flow can not have dead ends. Currently two-step silane cross-linked polyethylene pipe material is basically made of imported materials has withdrawn from the domestic market. But in fact the second step is a major market of raw materials for aluminum plastic composite pipe used in the production of hot water pipes, there is little to produce cross-linked polyethylene pipe. The main reason is the two-step granulation special material in advance, so the price higher than the price of one-step dosing of 20% -30%. Country two-step silane cross-linked polyethylene pipe material is the biggest brand, "Shanghai Chemical Factory Co., Ltd." production of "double flower" brand, accounting for about 60% domestic market share. Suzhou is also a "Kangsitanpu."
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