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Sunday, 10-Nov-2013 03:46 Email | Share | Bookmark
Heating Elements for Hot Runner Mold Systems: Tubular Heaters

When selecting replacement parts for your furnace, cost should not be as vital as most companies make it. The cost of heating elements between a good manufacturer and a bad one is negotiable, as compared with the overall investment. The production time and quality of the parts acquired by selecting a reputable manufacturer will more than make up for the difference. Keeping in mind the following pointers when selecting a manufacturer will ensure less downtime due to a defective product.

Manifold Heater and Cartridge Heater.

Cartridge heaters are utilized around the flow channel to ensure uniform temperatures. It is important 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 ensure an accurate reading.

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

A few of the most common reasons for failure include:

Lead short out.

This can be remedied by changing the lead type. If fiberglass leads were utilized, this could be the source. Hot runners by nature produce gases, which in time, saturate the fiberglass material, causing it to short out between the leads. Depending upon the ambient temperature around the lead area, Teflon leads can be utilized to fix this, as they are more resistant to gases.

Internal thermocouple not reading properly.

This can be caused by 2 different reasons. One reason is the thermocouple needs to be found in the center of the heating element. If not, you will never obtain a proper 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.Http://\n

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