Creating the most effective hot runner system design that includes manifolds, nozzles and full hot-halves demands a collaborative approach among the moldmaking supply chain: mold builders, molders, original equipment manufacturers and technology suppliers. […]
Mold manufacturers are under pressure. Shocking revelation, right? End customers demand or even expect to see increasing levels of quality, accuracy and consistency. […]
The injection molding industry generally perceives companies that use hot runner systems as more advanced than companies that use cold runner systems. Often, shops make the decision to use a hot runner without considering a cold runner’s possible cost and quality benefits, or management dictates the decision as part of a cost-savings initiative. [...]
In many cases, the cold runner system is a more viable option. In some applications, it may provide a mold and a process that is capable of producing higher-quality parts. […]
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: […]
During the process of injection molding, due to the poor exhausting condition of molds, the water vapor in the melt, the air in cavity, the volatile gas from volatile substance in raw materials as well as the material decomposition gas either remain inside the products to form air bubble […]
As for molding technics. Air bubble or air cavitation may occur in the plastic parts due to improperly-controlled material temperature and mold temperature, overfast injection speed, overlow injection pressure, too large or too small quantity of injection, insufficient dwell, unbalanced or insufficient cooling etc. […]
As for product structure and mold design. Optimize mold exhausting scheme, and exhausting channel should be particularly set at confluence of front materials of plastic melt in the cavity; […]
Mold builders and injection molders have different requirements when it comes to hot runner systems. Mold builders are often concerned about price, delivery and quality, while the molder is concerned with operation, performance and ease of maintenance. […]