Sheet extruder machine is extrusion production line host, it is the role of plastics, transportation of materials and products provide the required pressure. Extrusion has the following advantages: the production process is continuous, high production efficiency; wide range of applications that can produce tubes, rods, plates cables, profiles, etc; small investment, quick harvest. Extruder as the main equipment for processing polymers exist in many countries and China's machinery industry has become serialized, standardized series of mechanical products. Has many species, their use of performance indicators expressed by the relevant parameters. By Category 5.2.1 extruder extruder as follows: No. of how much can be divided into single-screw, twin-screw extruder; can be divided according to whether the exhaust vent and non-vented extruder; press screw The position can be divided into vertical and horizontal extruder. Our national standard GB \ T12783-91 provides the same preparation method Chinese rubber and plastic molding machinery number: Category number, consisting of numbers, support number, size code, design code, the code is the first three basic code, specific methods for example as follows: 1. SJ-45: S is plastic, J is an extruder, 45 is a screw diameter d, an aspect ratio of 20: 1 (specifications, standards, extruder length to diameter ratio of 20: 1, may not be labeled). 2. SJF-60 × 30: S is plastic, J extruder, F is blowing (species code), 65 for the screw diameter, a screw length to diameter ratio of 30: 1. Extruder generally consists of extruder, head, die, auxiliary of several parts. Extruders have basic equipment (screw and barrel), and heating and cooling gear consisting of several parts. The main sheet extrusion using a single screw extruder, single screw extruder main parameters are: (1) screw diameter: refers to a screw outer diameter, indicated by d, the unit mm, it can be characterized by an extruder extrusion the size of the volume, is an important parameter of the extruder. (2) Screw length: refers to the length of the working portion of the screw, i.e., than the length of the threaded portion (which will be defined as the process feed port to the end of the thread length of the center line) and a screw diameter, expressed in L / d. (3) Screw Speed ??Range: refers to the maximum speed and minimum speed range of the screw rotates, represented by n screw speed in revolutions / minute (r / min) (4) of the main screw drive motor power: refers to a motor-driven screw rotation power, with P said that the unit KW. Number of heating power and barrel heating section (5) Barrel: Barrel heating power refers to barrel heating electric power, with E said that the unit KW. Refers to the number of barrel heating section heating cylinder into pieces, i.e. the number of stages of temperature control, represented by B. (6) Productivity Extruder: extruder means the production capacity per unit time, represented by Q, the unit kg / h. (7) Machine Center height: refers to the height of the ground screw centerline, with H said that the unit mm. (8) Overall dimensions: total length refers to the total height × width × total, with L × W × H said that the unit mm. (9) The quality of the machine: with w expressed in metric tonnes or kilograms. Abbreviated PP polypropylene PP scientific name English name commonly known pleated plastic qualities of the polypropylene is crystalline polypropylene plastic, character is a white wood-like material, transparent than PE, depending on its crystallinity, forming a transparent to translucent products. Light, gravity less than water, polyethylene surface is hard, thin-walled products resistant to folding, commonly known as the pleated plastic. A gas combustion characteristics of petroleum refining --- propylene monomer produced in polypropylene easier to burn, away from the fire continued to burn, the upper end of the flame is yellow, the lower production of blue, a small amount of smoke produced when burning the melted dripping, and issued oil flavor. Advantages: Polypropylene mechanical properties, at room temperature, PS better than PE ABS, in particular temperature exceeds 80 ℃, its mechanical properties will not decline much; at low temperature, the mechanical properties become poor, brittle hair. Hot, soft, less rigid; temperature, ductile fracture, brittle hair. The surface hardness of polypropylene compare PS ABS; but better than PE and high quality surface finish; therefore, it can be done appliance housings and other products. Polypropylene biggest feature is that it has good resistance to bending fatigue; polypropylene production of active hinge, able to withstand hundreds of thousands of times folding bending without damage. Therefore, it is called pleated plastic. Polypropylene good sex is that it cooked in boiling water resistant, not damaged, and therefore, suitable as medical equipment, and utensils. Longitudinal and transverse tensile strength polypropylene difference is particularly large, and therefore, there is a good fiber-forming properties, suitable as fiber and polypropylene ropes acid resistance, many organic solvents, excellent electrical insulation properties. The biggest drawback of the disadvantage of polypropylene is insufficient high-temperature rigidity, while the low temperature brittle; poor resistance to environmental and outdoor use, easy to turn yellow discoloration brittle. Tensile strength of anisotropy, products deformation, continuous use temperature is low, creep resistance, long-term load impatience; poor printing performance. Suitable for the production of woven fiber, ropes, nets production pipelines, packaging, shrink packaging film production of medical equipment, resistance to cooking utensils, food packaging, household appliances shell acid container production, wires, cables and other crystalline polypropylene injection characteristics polymers, there is a sharp melting point, usually heated to 173 ℃ can melt a small amount of decomposition at 300 ℃; 360 ℃ on a large number of decomposition; therefore, injection molding, adjustable temperature range is large. When the injection, the general temperature of 190 ℃ --240 ℃; polypropylene can be used as a cleaning agent other materials easily decomposed when refueling. Polypropylene does not absorb water, usually without drying, sometimes in order to product quality, but also can be used at 60 ℃, the drying 30-1 minutes to discharge raw material floating. Polypropylene is highly crystalline plastic, which in the vicinity of the melting point of its liquid and solid volume vary greatly, coupled with anisotropic contraction of it, therefore, can lead to uneven shrinkage, i.e. shrinkage; therefore, design products , try to avoid uneven wall thickness; small polypropylene melt viscosity, good fluidity, flow longer than large, thin-walled products may also be filled; but at the same time, it's mold making, accuracy is high, otherwise it will Batch peak; because it's anisotropy, products very much deformed. Shrinkage rate of 18 ‰; overflow edge is 0.03m. The physical properties of the mechanical properties of an injection temperature table