In the injection molding production process of game controllers, weld marks are a common defect, usually caused by convection generated by the plastic during the flow process. This weld mark is formed when the front part of the molten resin from different directions cools down and fails to completely fuse at the joint. Although weld […]
Author Archives: sing-oi
During the injection molding process of HDPE plastic, dent phenomenon is a common and troubling problem, which usually occurs after the gate is closed or due to local internal shrinkage caused by insufficient injection. Dents appear as depressions or tiny depressions formed on the surface of injection molded products, which are mainly caused by multiple […]
In the process of Medical Double-Color Plastic Injection Molding Companies, whether it is a hydraulic or electric injection molding machine, all the movements during the injection process will generate pressure. Proper control of the required pressure is the key to producing high-quality finished products. Pressure Control and Metering System In a hydraulic injection molding machine, […]
Surface defects in medical injection molding products can significantly impact both the aesthetic quality and functional integrity of the final product. Common defects include cracks, silver streaks, grooves, ripples, wave marks, and embrittlement. These defects often arise from stress induced within the product, which can exceed its material strength. Understanding the causes of these defects […]
Ejection, also known as ejection marks or ejection drool, refers to the phenomenon of fibrous streamlines at the gate of plastic products, which usually occurs when the mold uses a side gate. When the plastic melt flows through narrow areas such as nozzles, runners and gates at high speed, it suddenly enters an open, relatively […]
Cracking is a common defect in plastic products, and its main cause is stress deformation. Factors that cause cracking include residual stress, external stress, and stress deformation caused by the external environment. The following is an analysis of cracking and whitening defects and corresponding solutions. Analysis and elimination methods of cracking and whitening defects 1. […]
Black spots refer to dark or striped black spots on the surface of the product, usually appearing near the gate along the flow direction. This defect is a surface quality problem and is common in the injection molding process. The following is an analysis and elimination method for black spot defects. Analysis and elimination method […]
Dimensional instability refers to the change in the size of plastic parts between each batch of router injection molding products or between each cavity product produced by each mold under the same injection molding machine and molding process conditions. Fluctuations in product size are usually caused by abnormal equipment control, unreasonable injection molding conditions, product […]
Bubble and vacuum bubble defects refer to defects in PPSU medical injection molding products caused by the slowest cooling at the center of the product wall thickness and rapid cooling on the surface. The rapidly shrinking surface will pull the material over, causing uneven shrinkage of the product volume and causing voids in the thickness […]
Sink marks and sink marks refer to local contraction caused by lack of material after gate sealing or during injection, which leads to depression or tiny dents on the surface of plastic products. This is a common problem in the injection molding process, usually occurring at the place where the wall thickness of the plastic […]
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