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Hot Runner Mold Is Divided Into Which?
May 23, 2017

Because the open hot runner is with the injection machine screw forward when the injection of the condensate to break through the mouth can be injected into the mold, in contrast to the injection machine inside the screw back when the mouth condensation to close the mouth. So usually gate size selection is very important, otherwise because of the gate area temperature, either condensation blocking hot nozzle injection, or hot nozzle at the gate is brushed, drooling. And when the screw back when the gate can not be condensed at the same time, the mold cavity will form an inverse suction, not conducive to the cavity pressure. A bit of commonly used sprue hot runner, straight gate Hot runner, with shunt channel of the submerged gate hot runner. Because the open hot runner structure is simple, the mold processing is simple and the maintenance cost is low, plus the injection product appearance request is not too high or the purchase cost consideration, after using also has no water mouth material head or very little water mouth material head, therefore uses this kind of hot runner way the user to be more. A bit of commonly used sprue hot runner, straight gate Hot runner, with shunt channel of the submerged gate hot runner.
and the needle valve type hot runner, when the nozzle of hot nozzle is injected with the injection machine screw forward, the air (liquid) pressure can adjust the valve needle to open the gate and shoot the glue, which can adjust the product appearance of the clamp waterline, shrinkage and warping. Conversely, in the injection machine inside the screw back, through the gas (liquid) pressure can be ordered to adjust the valve needle closed gate without glue. The sequential control can also compensate for the defects of the cavity filling in the multi-nozzle injection. Add the needle valve type Hot runner gate to make a little bigger, reduce the shear heat of the rubber mouth, through the instantaneous opening and instantaneous sealing out of the rubber mouth, the cavity filled with rapid, good pressure, no wire drawing and drooling, with needle valve type hot runner can be used for laminated cavity molds and multiple cavity family products injection molding. Needle valve type of hot runner structure is relatively complex, the mold processing accuracy and maintenance is relatively high, although the user due to the procurement cost considerations, but it is more advantages, but also by the majority of users.
Needle valve type Hot runner cylinder type needle valve hot runner, oil cylinder type needle valve hot runner and spring type needle valve hot runner three kinds. The cylinder type needle valve hot runner uses the air pressure to push the valve needle to open or seal the gate to complete the injection pattern, this way because in the injection workshop has ready-made compressed air, the trachea directly into the hot runner cylinder, so easy to use, but the pressure is limited, is also used by a large number of users. The oil cylinder type needle valve hot runner uses the hydraulic pressure to push the valve needle to open or closes the gate to complete the spray glue the pattern, needs to connect the hydraulic pipe input hot runner oil cylinder, this kind of method because of the hydraulic pressures is big, often uses in the surface area big and the wall thick plastic parts injection Spring-type needle valve hot runner using locking Spring compression mode to promote the opening of the valve needle or closed gate to complete the mode of injection, pressure adjustment is relatively small, but easy to use, fewer users.