Weld line formation mechanism of injection molded parts

Weld line formation mechanism of injection molded parts in the injection molding process, when using multi- gate or the presence of the cavity holes, inserts, as well as changes in product thickness dimension is large, plastic melt in the mold will occur in two or more directions flow , when the two stocks melt encounter, weld lines will form in the products . Injection molding weld line is not a phenomenon unique in other plastic molding process , such as: reaction injection molding, blow molding , die-casting weld lines will encounter problems . Weld line affects not only the presence of the appearance quality of the products , and the mechanical properties of products (strength and rigidity ) on a large , especially for  Instrument valve manifolds  , such as: fiber reinforced materials, etc. Effect of multiphase polymer blends more is obvious. Meanwhile molding process conditions on the performance of the weld line is huge, under different conditions, the strength of the impact zone of the weld line can reach 10 % to 2 valve control  Valve manifolds  is currently casting , injection molding valve casting technology has attracted people's attention for valve gate control has been a lot of research reports. Pouring hot runner valve gate design and application of the control method , is in the original with a hot runner gate to control the opening , forming a closed valve means , the injection gate opening and closing according to the specific requirements determine their work.