塑料常用物理性能简释（Brief explanation of common physical properties of plastics）.docVIP

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塑料常用物理性能简释（Brief explanation of common physical properties of plastics）.doc

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塑料常用物理性能简释（Brief explanation of common physical properties of plastics）

塑料常用物理性能简释（Brief explanation of common physical properties of plastics） Brief explanation of physical properties of plastic raw materials Release time nbsp2009-12-14 One flow characteristic (FLOW PROPERTIES) Thermoplastic plastic molding process generally undergoes heating and plasticizing, three basic steps of molding and solidification. The flow is through heating the heating plasticized solid polymer into a viscous fluid; flow molding is mobile with injection machine or extruder plunger or screw, with high pressure viscous fluid into the closed mold temperature is low, or at high pressure the viscous fluid is extruded from the die required shape, get the continuous profile; solidification is with the cooling method of the product from the viscous flow into glass. Almost all polymers are processed using the viscous flow behavior of forming the physical quantity. The characterization of the flow characteristics are as follows 1. melting finger value (MELT INDEX) The melting index of thermoplastic polymer is a simple and practical method of polyolefin extrusion, which is defined as at a certain temperature, molten polymer under certain load weight out of the ten minutes of the time from the provisions of the standard capillary diameter and length. The general determination in melt index instrument. Extrusion refers to the polymer by extrusion deformation when the shape and the ability to maintain the shape of the extrusion properties of polymer materials and processing technology of the products to choose and control right, under normal conditions, the polymer in the solid state and not by extrusion molding, can be obtained only when the extrusion deformation by macroscopic and useful the polymer in the viscous flow. The extrusion process of polymer melt, mainly by shear, shear viscosity and extensional viscosity can be extruded depends mainly on the melt. Most polymer melt viscosity decreases. With the increase of shear rate and shear stress Determination of polym