Cold runner system is used when molding LSR. Some injection molding devices allow operation under varying termination forces, which allows the processor to help close the mold at low pressure until 90%-95% from the cavity is filled with LSR (makes air easier to discharge) and then switches to higher

The concluding force prevents the silicone rubberized from swelling and overflowing. Some mold makers have designed an open cold runner system that is definitely so small that it has got to set multiple injection points (and thus the entire cavity) within an extremely constrained mold space. However, in the event cooled too quickly, it will absorb an excess of heat from the gate part of the mold, resulting in not whole vulcanization. This is accomplished by designing a gasket within the parting line and quickly vacuuming all the cavities using a vacuum pump motor.. In case your cold runner system is employed, it is important to establish the best temperature interval between the hot mold cavity and also the cold runner. Once the vacuum has hit the rated level, the form is fully closed and shot begins.

This technology makes it possible to mass-produce high-quality silicone rubber products and solutions without separating the nozzles. If the stream path is too hot, the compound may set out to cure before injection.Vacuuming inside the mold creates the best venting effect. Some great benefits of this compound can be maximized and productivity may be maximized.

By processing products in such a way, it is not necessary to eliminate the glue injection chair mould path, thereby avoiding increasing the labor intensity of the work and sometimes avoiding a large amount of material waste. Many manufacturers currently provide an injection nozzle which has a gas-operated switch as a standard device and will be set at various positions inside the mold. The rubber injection nozzle is controlled by the needle valve for forward stream. In many circumstances, the non-injected rubber track construction also reduces the operating moment