Double-screw pelletizing machine used for polyphenylene sulphide and primary pelletizing process

Abstract

The invention discloses a double-screw pelletizing machine used for polyphenylene sulphide and a primary pelletizing process. A vertical section of an inverted L-shaped feeding tube of the pelletizing machine is internally provided with a forced feeding screw; the upper end of the forced feeding screw is connected with a driving motor; an exhaust port is arranged at a nose side of a feeding hole of a cylinder; the exhaust port is provided with a rigid exhaust pipe; the rigid exhaust pipe is communicated with an exhaust fan by virtue of a hose; a space between the exhaust port and the feeding hole is 2-10cm. The primary pelletizing process comprises the following steps of: A, smashing screened polyphenylene sulphide fiber or lump material, adding the smashed polyphenylene sulphide fiber or lump material into the hopper of the double-screw pelletizing machine; B, heating and fusing by virtue of the cylinder of the double-screw pelletizing machine, then spraying into thread lines by virtue of the nose; and C, predrying cooled thread lines, carrying out grain-sized dicing and drying, and finally screening and then bagging and packaging. By adopting the double-screw pelletizing machine used for polyphenylene sulphide and the primary pelletizing process, a pelletizing production period is shortened, polyphenylene sulphide pelletizing efficiency and product quality are improved, raw material loss is reduced, and production cost is reduced.

Description

technical field [0001] The invention relates to a plastic granulation equipment, in particular to a twin-screw granulator for polyphenylene sulfide, and also relates to a polyphenylene sulfide primary granulation process. Background technique [0002] The traditional polyphenylene sulfide granulation mainly adopts the secondary granulation process, that is, the pulverized material is first granulated by a single-screw granulator, and then the secondary granulation is obtained by a twin-screw granulator. [0003] The reason why the above secondary granulation process is adopted is that the mixing of the single-screw granulator is not as uniform as that of the twin-screw granulator. In order to ensure the stable quality and good uniformity of the produced polyphenylene sulfide particles, it is necessary to pass After the single-screw granulator granulates once, it enters the twin-screw granulator to granulate; secondly, because the pulverized polyphenylene sulfide material has...

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Problems solved by technology

[0003] The reason why the above secondary granulation process is adopted is that the mixing of the single-screw granulator is not as uniform as that of the twin-screw granulator. In order to ensure the stable quality and good uniformity of the produced polyphenylene sulfide particles, it is necessary to pass After the single-screw granulator granulates once, it enters the twin-screw granulator to granulate; secondly, because the pulverized polyphenylene sulfide material has a small bulk density and short fibers are fluffy, the feed volume of the twin-screw granulator is very small. less, it cannot be spun into strips, and the single screw feed port is larger, relatively easy to feed, and basically can be spun into strips

[0004] Based on the above reasons, the current secondary granulation process of polyphenylene sulfide mainly has the following disadvantages: 1. The output of the single-screw granulator is very low when the primary granulation is performed, and the single-machine energy consumption is large, resulting in high energy consumption and labor costs ; 2. The raw materials are heated for many times, which is easy to cause decomposition, crosslinking and carbonization at high temperature, which affects the product quality; 3. After two particle making processes, the loss of raw materials in the production process is increased; Occupies a large area, which is not conducive to saving land resources

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