SMD Carrier Belt Wholesale

What are the main factors affecting carrier tape injection molding failures?

The criterion for judging carrier tape injection molding failures is the precision of the molded product, namely, the dimensional tolerances, form and position tolerances, and surface roughness. Precision injection molding requires many related conditions, but these four basic factors are fundamental.

When designing plastic products, engineering plastic materials should be selected first. Engineering plastics suitable for precision injection molding must possess high mechanical properties, dimensional stability, good creep resistance, and environmental resistance. The selection should consider the product's dimensional accuracy, weight, quality requirements, and the anticipated mold structure, as well as the appropriate injection molding machine. During processing, the main factors affecting precision injection molded products are mold precision and injection shrinkage.

In carrier tape injection molding, the mold is one of the key factors in obtaining carrier tape plastic products that meet quality requirements. The mold used for carrier tape injection molding should accurately meet the requirements of product dimensions, precision, and shape. However, even actual dimensions can vary due to differences in shrinkage. Therefore, effectively controlling the shrinkage rate of plastic products is crucial in precision injection molding technology.

The rationality of mold design directly affects the shrinkage rate of plastic products. Since the mold cavity size is obtained by adding the estimated shrinkage rate to the size of the plastic product, and the shrinkage rate is determined by the plastic production process, it is not only related to the gate type, gate location and distribution of the mold, but also to the crystal orientation (anisotropy) of the engineering plastic, the shape and size of the plastic product, and the distance and location to the gate.