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Wednesday, 23-Oct-2013 04:39 Email | Share | Bookmark
Heating Elements for Hot Runner Mold Systems: Tubular Heaters

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

Manifold Heater and Cartridge Heater.

Cartridge heaters are used around the flow channel to guarantee 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 guarantee an accurate reading.

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

A few of the most typical causes of failure consist of:

Lead short out.

This can be corrected by changing the lead type. If fiberglass leads were used, this might be the cause. Hot runners by nature create gases, which in 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 used to correct 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 acquire an appropriate 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.Perry Heating & Cooling\nGo to this web site


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