PP (propene polymer) raw material sheet material production process and device

Abstract

The invention discloses a PP(propene polymer) raw material sheet material production process and a device. The PP raw material sheet material production process comprises the following steps of: feeding materials, adopting a single screw extruder, wherein an extruding material cylinder is divided into four regions for heating,, evaporating moisture contained in a PP raw material so as to discharge in time through an exhaust hole arranged on the charging barrel; and squeezing into a mould for shaping and forming so as to form a sheet material, enabling the molten PP raw material to form a certain of pressure, cutting the molten PP raw material with the required length and placing on a specific stacking frame, and carrying out heat treatment and chamfering of edge. The PP raw material sheet material production process provided by the invention has the advantages that the dimly color condition of the surface of the PP sheet material is obviously improved, the inner holes, steam bubbles or acne scars are greatly reduced, and the performances of the sheet material in all directions are greatly improved; and a traction / brake process is simultaneously used to replace the traditional brake process, the situation that the sheet material at the outlet of the mould frequently is eccentric is eliminated, the thickness of the sheet material is guaranteed, the working procedure for repeatedly manually adjusting brake is reduced, and the operating efficiency is improved. In addition, in the PP raw material sheet material production process provided by the invention, the high-power drying equipment is not needed to install on a hopper, and the manufacturing cost is reduced.

Description

technical field [0001] The invention discloses a production process and device for PP raw material plates. Background technique [0002] At present, the production process of PP sheet is as follows: [0003] 1. Feeding: Feed in time to ensure that the hopper is not empty, so as to prevent the air from directly entering the drying circulation fan and affecting the drying return air speed. Different materials cannot be mixed. Pay attention to distinguish the grade and type of materials to prevent sundries and miscellaneous materials from entering the hopper and causing blockage of the discharge port. [0004] 2. Drying: Due to the high temperature absorption of PP resin, it must be dried before extrusion molding to remove moisture, otherwise its moisture content exceeds a certain limit, and the moisture will volatilize in the extruder barrel. Gas, so that the product contains pores inside, and the strength is reduced. Use 70°C circulating hot air to dry PP Yuanxiao, the dry...

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Problems solved by technology

[0004] 2. Drying: Due to the high temperature absorption of PP resin, it must be dried before extrusion molding to remove moisture, otherwise its moisture content exceeds a certain limit, and the moisture will volatilize in the extruder barrel. Gas, so that the product contains pores inside, and the strength decreases

[0019] The PP sheet produced by this kind of process has a relatively dark surface color and many pores, bubbles or pockmarks inside the sheet, which seriously affects the performance of the PP sheet in all aspects; Adjust the tightness of the brake to adjust the thickness and eccentricity of the plate. In the drying process, it is necessary to install high-power drying equipment, which will easily lead to many problems such as increased processes, increased processing time, increased costs, and low production efficiency; therefore , the existing production process of PP sheet products needs to be improved urgently

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