Wuhan Handern pipe extrusion equipment and technology
DATE：2021/1/28 8:48:22 / READ： / SOURCE：This station
Wuhan Handern pipe extrusion equipment and technology
Tube is one of the important products of extrusion molding. The plastics that can be used as raw materials for pipes include rigid PVC, soft PVC, ethylene, polypropylene, molded heavy container 6, heat type B boiler, such as poly eye, polycarbonate, poly trimethylene, poly gold fluoropropylene bridge, etc., which have large production capacity, such as l field of suction Union, B field of dyeing and poly propylene wall pipe. The diameter of Guancun village is 50m from erkemi. The diameter and wall thickness have been standardized. Plastic sheet extrusion line www.handern.comThe billets that have been preliminarily formed come out of the die and enter the cooling setting device. The billets are cooled gradually in the cooling setting device to obtain the required final geometry, dimensional accuracy and surface finish. Then they enter the cooling water tank for further cooling. Finally, they are led to the cutting device by the traction device and cut to the required length.
1. Extruder
Generally, the screw of Guancun extruder is equal energy and unequal depth cut screw with straight diameter of 30 ~ 4mm. The length to diameter ratio of screw is 15-5, and the pressure transfer ratio is 2-4. The extruding machine adds the over speed plate and the over speed net at the junction of the discharge and the outlet plate. In general, the 40 day network of Keguan first floor passes through Luzhou network, and the 4 x 80 day network of juyixie pipes passes through Xiaowang network. Plastic sheet extrusion line www.handern.com
2. Die
When the plastic pipe is produced in a given extruder, the diameter of the plastic pipe should be controlled in the range of 30 ~ 130% of the screw diameter. For twin-screw extruder, it can be controlled in the range of 45 ~ 450% of the screw diameter. See table 9-12 for the die specification and extrusion mechanism of rigid PVC pipe in China. For the twin-screw extruder and the applicable pipe extrusion die specification, please refer to 9-13.
Extrusion die is to keep a certain plastic state for the plasticized material, and produce a certain pressure to make the plastic shape.
(1) Pipe extrusion die type pipe extrusion is caused by stomatitis and flow direction of extruder, and the screw and pipe of extruder are concentric: this kind of die is simple in structure, easy to manufacture, so the cost is low, but it is not easy to remove the compound line produced by splitter grid ribs, and the die is bulky. The structure is shown in figure 9-131. Straight through die structure is suitable for hard PVC, soft PVC, PE, PA, PC, etc.
① The flow direction of the material in the die, that is, the direction of the extruded pipe, is at right angles to the conveying direction of the extruder, as shown in Figure 9-13. This kind of die has no dividing grid ribs, so it doesn't produce blending line; the dividing is in the form of mandrel, so it is difficult to manufacture and the cost is high. It is suitable for pipe production with high sizing accuracy, especially for PE, PP and PA pipes with inner diameter setting.
② The material flow in the die and the screw of the extruder is the same, that is, there is no splitter bar and no mandrel, and the material enters the setting section through the sieve plate hole. This structure is especially suitable for the production of large diameter polyolefin pipe. The extruded pipe has no weld mark and blending line. The die has compact structure, small volume, stable material flow, easy to control and uniform flow rate. 5 yishuiling 11
It should be noted that: when producing large diameter thick wall pipe, in order to make the wall thickness uniform, the mold sleeve should be able to adjust the eccentricity. Generally, the gap between the mold sleeve and the core mold is 10 ~ 18% smaller than the upper gap, and the screen plate extrusion die is suitable for PE, PP and other plastics. Plastic sheet extrusion line www.handern.com
⑧ The flow direction of the material in the die and the extruder is the same, which can be either sieve plate hole structure or right angle structure. It can be seen from figure 9-13ii that it is a round double-layer special-shaped pipe die. The flow direction of material in the die and extruder is consistent, and the sieve plate hole structure can be used. It can be seen from figure 9-14 that one is a round double-layer special-shaped pipe die.
(2) When the inner diameter of the annular hole is greater than 3 / 5 of the outer diameter, the material flow is a special one-dimensional flow. Generally, the inner diameter of plastic pipes is greater than 3 / 5 of the outer diameter.
Author：admin