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....
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,...
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.
(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)
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...
(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...