Polyethylene silicon core composite pipe
DATE：2022/9/8 8:43:02 / READ： / SOURCE：This station
Polyethylene silicon core composite pipe
Polyethylene silicon core pipe is a composite pipe, which is the outer layer of polyethylene silicon core pipe extruded from high density polyethylene; The inner layer of polyethylene silicon core pipe was extruded by mixing high density polyethylene powder with a certain proportion of silane lubricant with low friction coefficient. The friction coefficient of the inner wall of this composite pipe is very small (only 0.08 ~ 0.15). Because the inner surface of this pipe has a very good lubricating performance, this composite pipe is often used as the communication cable sleeve at present. Hollow plate production line www.handern.comThe mechanical properties of polyethylene silicon core pipe are the same as those of high-density polyethylene pipe. It has the advantages of good toughness, free bending, good water resistance, rust prevention, long service life, smooth inner pipe wall, and small friction coefficient. When used in optical cable casing, the construction and installation are convenient and fast. (1) The raw material is polyethylene silicon core composite pipe, which is divided into inner and outer layers, and there is a color mark on the surface. High density polyethylene for outer layer molding, with density of 0.954g/cm ³、 HDPE materials with a melt flow rate of 0.1 ~ 0.5g/10min (6100mhdpemf014g / 10MN produced in linchu molding technician's Manual of Yangzi Petrochemical Company can be selected) are lubricated with proportion e of the inner material of polyethylene silicon core pipe, or are extruded with silicone mixture, peripheral lubricant and other materials for forming color marking lines, and can be used as general extrusion grade high-density polyethylene and color masterbatch. (2) The b-core molding process is basically similar to the extrusion molding process sequence of polyethylene pipes, except that since this kind of pipe needs three kinds of materials to melt and composite molding, the plasticization of the three materials needs to be molded in three extruder molds. The specific process sequence is as follows, and then three kinds of molten plasticizers with different properties are extruded into a composite pipe to form
A composite pipe forming mold, a vacuum sizing sleeve, cooling and cooling sizing, a hollow plate production line (www.handern. Com)
Polyethylene silicon core pipe outer layer material extrusion plasticization polyethylene silicon core pipe inner layer material extrusion plasticization polyethylene silicon core pipe color marking material extrusion plasticization composite pipe cooling, cooling, curing, traction, cutting, coiling, quality inspection, packaging warehouse
The equipment for extrusion molding of polyethylene silicon core pipe is the same as that for extrusion molding of polyethylene pipe, except that the specifications and screw structures of the three extruders for extrusion and plasticization of the three materials have their own characteristics. The outer layer of polyethylene silicon core pipe uses a lot of materials, so larger size extruders should be selected; If there is less material for the inner layer, smaller size extruder shall be selected; However, few materials are used for color marking, so the extruder with the smallest specification in the extruder series should be selected. Hollow plate production line www.handern.com
If the outer layer of the polyethylene silicon core pipe is made of a screw with a diameter of 90mm and a length diameter ratio of 33), the inner layer of the silicon core pipe should be made of a screw with a diameter of + 45mm and a length diameter ratio of 28:1; For the plasticization of color marking materials, the general-purpose screw of extruded HDPE material with a screw diameter of medium 20mm can be selected. (3) In the extrusion molding of polyethylene silicon core pipe, due to the different materials used for the composite pipe, the plasticizing process temperature of the extruded materials by the three extruders is different. The outer layer of the silicon core pipe and the color marking line are made of high-density polyethylene. The temperature control of each section of the extruder barrel for extruding these two materials is the same as that of ordinary high-density polyethylene pipes. Because HDPE resin is mixed with silane lubricant, the process temperature control of each section of the extruder barrel is slightly different. Hollow plate production line www.handern.com
The feeding section temperature of the barrel is 100 ~ 125 ℃, the plasticizing section is 135 ~ 160 ℃, the homogenization (4) process operation point section temperature is 170 ~ 185 ℃, the melt flow rate of the materials used for forming the silicon core composite pipe is 351900 ① e, and the extrusion materials of the three extruders are the same. This is conducive to the mixing of the three kinds of molten materials extruded into the composite pipe mold by the three extruders at the same time. The assembly boss or plane joint gap between them; The manufacturing and assembly of each part should be innovative. ③ The roughness r of the lowest part of the internal meter shall not be greater than 0.32pm coefficient. The machining accuracy and smoothness of the mandrel outer working surface in the mold shall be strictly controlled. ④ the composite pipe after forming shall be cooled down slowly, and the temperature of the cooling water in the water tank shall be controlled within the range of 12 ~ 16 ℃. ⑤ The drawing speed is matched with the extrusion speed of the tube blank, and the drawing speed of the extruded composite tube is controlled within 10m / min. Hollow plate production line www.handern.com
Author：admin