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Interchangeable Needle Valve Pre-Chamber Simplifies Hot Runner’s Maintenance | Plastics Technology

Hasco’s Vario Shot Xgate features an interchangeable needle-valve pre-chamber to lower the cost and difficulty of maintenance.

Hasco has expanded its Vario Shot hot runner nozzle range to include a new model with an interchangeable needle valve pre-chamber — the Vario Shot Xgate. The wear-resistant Xgate extends the service life of the gates, and it features precision needle guidance with a pre-centering function. The interchangeable pre-chamber is also highly resistant to abrasive and chemically aggressive materials. Leakage Slope

Interchangeable Needle Valve Pre-Chamber Simplifies Hot Runner’s Maintenance |               Plastics Technology

Individually geared to specific applications, Hasco says the two versions of the Vario Shot Xgate can work for either amorphous or semicrystalline plastics, and the gate area and contact surfaces can be altered for application-specific temperature control.

Hasco says the Xgate’s needle valve pre-chamber complements the Vario Shot range, which provides compact dimensions, precise temperature control, simple servicing and modular design. There are more than 1,000 nozzle variants — from gating on lower distributor manifolds up to high-end needle-valve solutions. The wide selection of nozzle lengths, including runner and individual nozzles, offers greater freedom in mold design.

The newest addition to Hasco’s Vario Shot line of hot runners is the Xgate with an interchangeable pre-chamber. Photo Credit: Hasco 

The decision which process to use can be quite complex. Here are pointers that will help you to choose the right one for your application

Sequential valve gating either eliminates or greatly reduces the flow-front collisions, and resulting knit lines, between a set of nozzles. However, there are still applications using sequential molding where a “ghost mark” or marks occurs on the part between a set or pair of nozzles and/or near the gate itself.

Addressing hot-runner benefits, improvements, and everyday issues from the perspective of decades of experience with probably every brand on the market. Part 1 of 2.

Interchangeable Needle Valve Pre-Chamber Simplifies Hot Runner’s Maintenance |               Plastics Technology

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