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Thursday, 22-Aug-2013 04:02 Email | Share | Bookmark
Heating Elements for Hot Runner Mold Systems: Tubular Heaters

When choosing replacement parts for your furnace, cost should not be as critical as most companies make it. The cost of heating elements between a good manufacturer and a bad one is negotiable, as compared with the total investment. The production time and quality of the parts obtained by choosing a reputable manufacturer will more than make up for the difference. Keeping in mind the following suggestions when choosing a manufacturer will guarantee less downtime due to a defective item.

Manifold Heater and Cartridge Heater.

Cartridge heaters are utilized around the flow channel to guarantee uniform temperatures. It is necessary to keep the distance between the heaters and the manifold equal or greater than 1x the diameter of the heating element.

Thermocouple placement should be located equally distanced between the heating element and the flow channel, and should be set deep to guarantee a precise reading.

If an internal thermocouple is utilized, it is necessary to guarantee that it is located towards the center of the heating element, depending upon whether the controller is grounded or ungrounded.

Some of the most common reasons for failure include:

Lead short out.

This can be fixed by changing the lead type. If fiberglass leads were utilized, this could be the cause. Hot runners by nature create gases, which over time, saturate the fiberglass material, causing it to short out between the leads. Depending on the ambient temperature around the lead area, Teflon leads can be utilized to correct this, as they are more resistant to gases.

Internal thermocouple not reading correctly.

This can be caused by two different reasons. One reason is the thermocouple must be located in the center of the heating element. If not, you will never obtain a correct temperature of the flow channel. The other reason is whether or not the unit is grounded or ungrounded. Consult your controller manufacturer to determine this.Homepage\n


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