The improper design for the structure of plastic parts, the incorrect setting of injection molding technical condition, inappropriate design of mold feed system, temperature control system as well as ejector unit etc altogether result in overlarge remnant internal stress inside the products, and accompanied with insufficient rigidity of product structure and delayed treatment for the [...]
During ejection, white ejector mark usually appears on the plastic parts in contact with the ejector pin and such ejector mark will easily crack during actual use of the products. The causes thereof comprise: […]
The injection parts stick to the mold, making it rather difficult for ejection. The causes thereof comprise: […]
The condensed material of sprue sticks to the sprue of molds, which poses difficulty for ejection. […]
Color is normal on the surface of products, though black spots or lines occasionally occur. The dark spots or black lines are fundamentally caused by the thermal degradation of material or carbonization of impurities due to various factors. The raw material is mixed with impurities (such as impurities falling off when the operator is unripping [...]
Aberration refers to the discrepancy of color on the products wherein the tint is uneven. The causes whereof comprise: […]
1 Use plastics with sound glossiness (such as ABS and PP etc), appropriately add additives which can improve the glossiness of products, and reduce the content of volatiles in raw materials (such as lubricating agent); […]
The products are provided with uneven surface glossiness and are even covered with shades. The causes whereof comprise: […]
During the injection and filling process, the plastic melt enters into the clearance of parting line,clearance of sliding surface of the slide, gap between inserts and holes of ejector pin which are related with mold cavity structure, and overflow thereby occurs […]
There may be a variety of solutions, especially for some specific situations, but the general solutions include: […]