挤出生产注意的问题（Extrude production attention）.docVIP

挤出生产注意的问题（Extrude production attention） PVC Analysis of common problems in profile production System control is guaranteed PVC Key to long-term stability of profile quality, It contains Formula quality, Process quality, The appearance quality Quantity, physical and chemical indicators Etc. 4 The first two items are the premise and foundation of the latter two, which is also the weight of quality control and technical management In the heavy. The mixture of resin and auxiliaries and the density of the mixture is correct PVC The impact strength produces a larger image Ring. PVC The processing temperature is a certain range, the temperature is too high, PVC Easy to decompose; The temperature is too low, PVC Not enough plasticizing, The dispersion of various components can also lead to the increase of brittleness. The main engine speed reflects the extruder PVC And the shear function, Too much speed, The increase of shear force will reduce the low temperature performance and weld Angle strength. High molding pressure is good for improving the mechanical properties of profiles. Especially low temperature impact strength. The cooling effect of profile molding is to keep the large molecular chain of stretching in time. Meet the product requirements. Slow cooling can make long chains have enough time to stretch, So the internal stress is small, Can reduce the warp of products, The bending and Shrinkage, thus improving the impact strength and welding Angle of the products. formula The discussion formula must not be free from raw materials. The formulation is not entirely dependent on the composition of the composition, To a great extent, it depends The intrinsic properties and quality of raw materials. Its a compound stabilizer, Because the internal components are different, It will be inconsistent with other ingredients Influence profile quality. So, When we talk about the formulation, After determining every type of raw material and manufacturer, There is actual Meaning.