LATEST ARTICLES

The Principal of Plastic Injection Moulding The so-called plastic injection moulding process refers to: the plastic material in the barrel of an injection molding machine is plasticized into a melt by the sheer heat that is generated by external heating and screw rotation, and then the melt is fed into the cavity of...
Gate Design Considerations: 1.Injection molding gate is a small opening between the runners and the mold cavity. their location, quantity, shape and size, etc. have a great influence on product appearance, dimensional , physical characteristics and production efficiency. 2.The gate size is dependent on product weight, material and gate types....
plastic resin material
In today's market, there are tons of material for customer to choose from. Therefore, The selection process of plastic injection molding material is very challenging at the beginning. At ECO Molding, we are well aware that each plastic material has its unique characteristics and advantages,...
The Causes of Black Spots
What are black spots?(appearance)? Black spot refer to the black Speck or streak on a molded product. The black spots appearing on the surface of a molded product are the black spot. For some reason, its composition is estimated to be a charred resin or a carbonized resin.
the cause of burn mark air trap
(1) What Is Burn Mark? (Appearance) Burn Mark refers to the blackened edge that is caused on the surface of a molded product during the injection molding process. Fig. 1: Burn Mark on a Sample Handle (* Sample size is approx. 10cm)
welding line injection molding defect
What Is Welding Line? (Appearance) The weld line appears where the resin flows meet. As shown in the figures below, weld lines will definitely appear in the part with opening. The Causes of Welding Lines (2-1) Low Resin Temperature...
sink mark injection molding defects
(1) What is sink mark (appearance)? A sink mark refers to the surface depression caused by resin shrinkage. After the crystalline resin is cooled and solidified, its volume is greatly reduced, which results in the sink mark. Since the shrinkage (shrinkage ratio) is basically fixed, and the greater the thickness the higher the shrinkage, the sink...
(1) What is bubble (appearance)? Bubble refers to the phenomenon in which the surface of a molded product  bulges. Bubbles are prone to occur in the following two scenarios, i.e., the surface of the product gradually starts to bulge when it is taken out of the mold after...