A PTF heater starts with a high grade, low shrinkage polyester substrate in sheet or roll form.
A polymeric, silver-based paste is screen printed onto the polyester in the desired circuit pattern. This sheet or roll is then oven dried to cure or "set" the element. The circuits are then die cut apart.
The next step is to add the terminals for lead attachment. The open face circuit is then covered with a double-sided pressure sensitive adhesive (PSA) tape on a polyester substrate. One side of the PSA joins the top and bottom layers of the heater. The other side of the PSA is used to apply the heater to the desired part to be heated. |
