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Polivalve FAQ

I am interested in a DME Valve Gate Hot Runner System from DME, but I want to process glass-filled thermoplastic. Can I do this?

It may be possible depending on the thermoplastic and application. Please contact your DME Customer Service Representative, who will put you in contact with a DME Technical Service Representative who will review your application requirements.

I would like some information on servicing or installing my DME Valve Gate hot runner system. Where can I find that information?

At this time there are no packing slips or installation instructions available for download from the “Resources” section of the DME Website. Please contact your DME Customer Service Representative for assistance, who will put you in touch with a DME Technical Service Representative.

I would like to build my own hot runner system using DME valve gate nozzles and cylinder assemblies. Can I do this?

In general, Polivalve hot runner nozzle, components, and cylinder components are not available for building your own valve gate hot runner system. We do offer a Unitized “drop-in” system.

I would like to order a single drop valve gate system. Is this available?

DME can offer pneumatic valve gate hot runner systems for single cavity molds. Please contact your DME Customer Service Representative who will put you in contact with a DME Technical Service Representative to review your application.

I would like to relieve or reduce the amount of land contact between the seal off diameter of the nozzle tip and the surrounding mold steel. Where can I find instructions for this?

Please contact your DME Customer Service Representative, who will put you in contact with a DME Technical Service Representative to review your application with you. Because the amount that may be relieved from the seal-off diameter for a full-body or extended full-body tip depends on the intended application, no standard instructions are posted at this time. Do not modify or relieve the seal-offdiameter of a DME bodiless or high-performance bodiless tip.

Sometimes I see a grey wire and purple wire with a Polivalve nozzle heater. What wires are those?

The wires with purple or grey color wire insulator are power wires. Typically a Polivalve heater that has a specific thermocouple color code set, will be delivered with power leads that have a different color, or have an identifying strip, mark, or heat shrink to help identify the power leads. Please note that if the power leads were identified by a strip, mark ,or heat shrink and the leads are cut, the identifying strip, mark, or heat shrink will be removed. In such case s it is recommended to add marker tape to each power lead for ease of future maintenance.

What is the benefit or advantage to using a tapered valve pin shut off versus a cylindrical or “straight” valve pin shut off in a DME hot runner system? I notice that DME offers both styles.

DME offers both styles of valve pin shut-off, as different customers have different preferences. DME recommends cylindrical valve pin shut-off if possible.

What is the processing temperature upper limit that I can use with my DME Valve Gate Hot Runner System?

It typically depends on the application, as well as the tip or tip assembly used. All potential DME Valve Gate applications are reviewed by the DME Technical Service team for feasibility.

When using a high performance bodiless tip with standard conductive capsule, do not use with filled thermoplastics or with applications requiring more than 480°F (249°C) melt processing temperature.

When using a high performance bodiless tip with wear-resistant conductive capsule, filled thermoplastic applications are possible depending on the application (not recommended for filled thermoplastics that have more than 30% filler including glass, talc, mineral, other). Not recommended for applications that require greater than 635°F (335°C) melt processing temperature.

When using a regular bodiless tip, filled thermoplastic applications are possible depending on the application (not recommended for filled thermoplastics that have more than 30% filler including glass, talc, mineral, other). Not recommended for applications that require greater than 635°F (335°C) melt processing temperature.

When using a full body tip or extended full body tip, filled thermoplastic applications are possible depending on the application (not recommended for filled thermoplastics that have more than 30% filler including glass, talc, mineral, other). Not recommended for applications that require greater than 635°F (335°C) melt processing temperature.

In all cases, if you have an application requiring a valve gate that exceeds the recommended upper processing temperature or if you have an application requiring a valve gate that exceeds 30% filler, please contact your DME Customer Service Representative, and you will be put in contact with a DME Technical Service Representative to review your application requirements.

What is the upper limit injection pressure that I can use with my DME Valve Gate Hot Runner system?

The DME Valve Gate Hot Runner System is not to be used in applications that exceed 20000 PSI injection pressure. However please note that if you are approaching 20000 PSI injection pressure, the injection processing window for a typical injection molding machine will most likely become significantly reduced, which may affect your ability to mold good parts. In such cases it is recommended to refer to your injection molding machine specifications or to speak to a technical representative for the manufacture of your injection molding machine.

What types of nozzle heaters are available for order as replacement items for a DME Valve Gate hot runner system?

The embedded heaters are used on the nozzle bodies. All suggested replacement items for any DME Valve Gate hot runner system will be listed on the system drawings delivered with the hot runner system.

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