Hot Runner Valve Gate Troubleshooting

Contact between hot runner nozzles and manifold resulting in overheating noticeable on the high load of the heating zone.

Hot runner valve gate troubleshooting. Most hot runner manufacturers use mathematical formulas to calculate theoretical thermal expansion of valve pins and related tooling and plates. A valve gate solution. Valve gate opens at start of injection filling cold runner. The cold runner design suggestions for a pre filled cold runner are basically the same as a that of a flow front timed cold runner.

Incorrect stack height of valve pin to gate insert. Valve gate system with integrated needle drive. Valve gates can help eliminate these problems. The first problem area is usually the gate diameter second is the gate land and third is the size of the nozzle orifice.

When adjusting the valve gate sequence to optimize the part it is very easy to trap air at the delayed hot runner gates which can be very difficult to vent. The result is a burn that appears to be coming from the hot runner gate but is in fact a gas trap at the hot runner nozzle tip. Adjust the channels for the melt in the hot runner. If you cannot find an answer contact your local incoe representative.

When troubleshooting hot runner problems i start with the gate diameter and land length. Length of the valve pin relates to preload on the gate insert. Molding machines m3 custom. No preload will cause long gates.

Uninterrupted heat transfer to the valve pin. Clean the hot runner. Valve gate closes when runner is full and remains closed until flow front passes cold gate. Helps to enhance gate cosmetics.

Too much will fracture the gate. Significantly minimizes wear of the gate and valve pin. Click on the possible problem you may be experiencing below to reveal a solution. Valve gated stack molds 48 48 cavity and 64 64 cavity with back to back configuration are now economically feasible.

Problems with hot runners and heated sprue bushings always seem to be in one of three places. Analysis fill warp cool pack feasibility studies design support. Maintains critical high tolerance dimensions and concentricity. Does not require direct reliance on cavity steel for pin alignment to the gate.

Due to the construction of the nozzles the valve gate can be handled like a conventional hot runner system. An in line valve gate with an integrated needle drive is a general purpose system compared to standard designs see figures 2 and 3. Control valve gate controllers temperature control manufacturing solutions. Valve gate reopens after flow front passes cold gate.