Processing technology of ABS pa-747s:Abs is an amorphous polymerwith no obvious melting point. Due to the variety of its brandgrade, in the process of injection molding should be according tothe grade of the different development of appropriate processparameters, generally in 160x: above, below 270c can be molded.Because the temperature is too high, there is a tendency to destroythe rubber phase in abs, and the decomposition begins above ztoc.In the forming process, abs has good thermal stability, a widerange of options, and is not easy to degrade or decompose.Moreover, the melt viscosity of abs is moderate, its fluidity isbetter than polyvinyl chloride, polycarbonate, etc., and thecooling and curing speed of the melt is relatively fast, generallyin 5? Cold setting can be done within 15s. The li of abs isrelated to the injection temperature and pressure, among which theinjection pressure is slightly sensitive. In order to reduce themelt viscosity and improve the filling performance, the injectionpressure can be used in the molding process. Abs has differentproperties of water absorption and adhesion depending on itscomponents. Its surface adhesion and water absorption rate are 0.2?0.5% sometimes up to 0.3? Between 0.8%, in order to get more idealproducts, dry treatment before molding, so that the moisturecontent is reduced to below 0,1%. Otherwise the surface of theproduct will appear bubbles, silver wire and other defects.
Overview of raw materials for ABS pa-747s:Injection molding withabs resin in addition to special grade or for coloring treatment ofthe resin, most of the light color or porcelain white opa Resin water absorption is not very high, such asprocessing allowable value of 0.1? Under 0_2%, for tight packaging,proper storage and product re are not too high, can beprocessed without drying. However, if the moisture content of theparticles exceeds the specified value, they must be dried beforemolding. For particles or products of special grade with highre (such as electroplating products), they must be driedbefore molding.
