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DMax Hot Sprue Bushings FAQ

D-Max HSB

I am interested in a D-MaxHot Sprue Bushing, but I want to process glass-filled thermoplastic. Can I do this?

It may be possible depending on the thermoplastic and application. If you require a recommendation, 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 can order CIH heaters for the DME Hot One nozzle assembly, but not for the D-Max Hot Sprue Bushing assemblies. Why can’t I order a CIH heater for my D-Max Hot Sprue Bushing assembly?

CIH heaters are not available at this time for the D-Max Hot Sprue Bushing product family.

I would like some information on servicing or installing my D-Max Hot Sprue Bushing assembly. Where can I find that information?

The necessary information is located in the “Resources” section of the DME Website, under “Packing Slips”, and can be found here. If you have a question that is not covered by the product packing slip/installation instruction, please contact your DME Customer Service Representative for assistance.

I would like to build my own hot runner system using D-Max nozzles, but I only see a hot sprue bushing option. Are D-Max nozzles available for placing under a manifold?

At this time, D-Max is available as hot sprue bushings only. You would order DME Hot One nozzle assemblies to place under a hot runner manifold. DME Hot One nozzle assemblies (for placing under a manifold) can be found at the following link here.

I would like to download CAD files from the DME website for the D-Max Hot Sprue Bushings, but when I go to the CAD Library section of the DME Website (PARTSolutions), I do not see the CAD download data. Where can I find the data that I need?

The CAD download data is currently directly linked to the part number information shown in the DME Hot Runner online digital catalog. The D-Max catalog pages can be found here.

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 of a D-Max ring gate retainer, extended ring gate retainer or sprue gate tip depends on the intended application, no standard instructions are posted at this time. Do not modify or relieve the seal-off diameter of a D-Max point gate retainer.

On the main body of the bushing, there is both an external thermocouple as well as a thermocouple that is integral to the heater. Which thermocouple am I supposed to use?

For the head zone, use the thermocouple that is integral to the heater. For the main body heater, it is recommended to use the external thermocouple, and only use the thermocouple which is integral to the main body heater, as a back-up should the external thermocouple fail.

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

The wires with purple or grey color wire insulator are power wires. Typically, a D-Max 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 cases it is recommended to add marker tape to each power lead for ease of future maintenance.

What is the processing temperature upper limit that I can use with my D-Max Hot Sprue Bushing?

It depends on the application, as well as both the bushing assembly and the tip or tip assembly used. The D-Max unheated head hot sprue bushing assemblies are not recommended to be used with applications requiring greater than 480°F (249°C) melt processing temperature. If you have an application that exceeds 480°F (249°C) melt processing temperature, it is recommended to use a D-Max hot sprue bushing assembly with heated head.

The D-Max ring-gate and point-gate tip assemblies are available with standard needles as well as wear-resistant needles. Standard D-Max needles are not recommended to be used with any filled thermoplastic, and are not recommended to be used in applications that require greater than 480°F (249°C) melt processing temperature. Wear-resistant D-Max needles can be used with filled thermoplastics (not recommended for thermoplastics that have greater than 30% filler including glass, mineral, talc, other), and are not recommended to be used in applications requiring greater than 635°F (335°C) melt processing temperature.

D-Max sprue tips can be used with filled thermoplastics (not recommended for thermoplastics that have greater than 30% filler including glass, mineral, talc, other) and are not recommended to be used in applications requiring greater than 635°F (335°C) melt processing temperature.

If you have an application that requires greater than 635°F (335°C) melt processing temperature, if the intended thermoplastic has greater than 30% filler, or if you would like a recommendation as to the parts best suited for your intended application, 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 D-Max Hot Sprue Bushing assembly?

The D-Max Hot Sprue Bushing assembly 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 D-Max Hot Sprue Bushing assembly?

The “RBP”-type heaters used on the nozzle bodies.

All suggested replacement items for any D-Max Hot Sprue Bushing assembly are shown in the associated packing slip/installation instruction. The D-Max packing slips are located in the “Resources” section of the DME Website, under “Packing Slips”, and can be found here.

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