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| June 16th, 2006 |
| Cartridge Heater Removal |
Another thing to consider is that the force required to remove a cartridge heater is also proportional to the length of the heater. That is, the force required to extract a 20? long cartridge heater will be twice that of a 10? long heater. What we found was a 20? cartridge heater and here?s what we did: We used two ten inch cartridge heaters (one inserted in each end of the cavity), and designed the heaters with a hex nut on each end to aid in breaking the heaters free with a wrench. Thermal also suggested that the customer coat each heater with Ease-Aid and let the coating dry before inserting the cartridge heater in the hole. This acts like a safe mold release. Never use mold releases that contain powdered metal, grease or silicon. These agents can contaminate the leads and lead to premature heater failure. Removal Tips When using a rod as a "knock-out" tool, use one that is close to the same diameter as the cartridge heater. When the cartridge heater has seized and is difficult to remove, some people use a rod to punch the heater out. If the rod is too small, it can cause the cartridge heater end to mushroom and scar the mold. Thermal Corporation also recommends the use of a release and heat transfer agent such as Ease-Aid. Another alternative is to use a threaded fitting such as Thermal's Configuration TF available in brass or stainless. |
©2004 Thermal Corporation | 1264 Slaughter Road, Madison Alabama 35758
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