PP has excellent workability, and can be formed by a conventional thermoplastic processing method, for example, extrusion processing, injection molding, thermoforming processing, and bead foaming. Extrusion processing is the main processing method of polypropylene resin PP by heating and pressurizing polypropylene resin PP in an extruder to make it into a molten flow state, and then continuously extruding it from a die. forming. This method can produce polypropylene PP blown film, biaxially oriented film, cast film, composite film, uniaxial stretch orientation, film, tear film (bundling rope), packing tape, flat wire and woven bag , pipes, sheets, monofilaments and ropes, various ordinary and microfibers, fabrics, extrusion coating materials, extruded foam materials and bottles and other products.
The processing process of PP plastic raw materials is mainly the melting, flowing, and cooling of the rubber pellets into finished products. It is a process of heating and then cooling, and also the process of changing the plastic from particles to different shapes. The following will explain the angles of different stages. Processing process. The melting device heater gradually melts the raw material particles into a fluid flow, which is mainly suitable for temperature adjustment of different raw materials. Increasing the temperature will tend to accelerate the flow of the raw materials, which may increase the efficiency but may not ensure the excellent rate, and a proper balance must be obtained. .
The good effect and the characteristics of PP with high thermal cracking are all good in smoothing the raw materials to the die during production to avoid the shortage of filling or reflow. The reflow represents the faster flow rate of raw materials, which will result in an average Increased flow efficiency is one of the methods available for processing, but it also causes the MFR distribution to be abnormal, which may lead to increased instability, which may lead to an increase in the defect rate. However, the PP finished product is not a product with high dimensional precision, so the impact is not great.
