Quite frankly, the better the oven, the better the parts. This is true for both dip molding and dip coating. In production, and in order to maximize consistency and quality of dipped parts, using a conventional oven for dipping purposes is not advised. Natural ovens and those relying solely on natural convection are unlikely to heat parts evenly. There will be temperatures gradients both vertically (from the bottom to the top) of the oven, as well as across X-Y axis (or dipping plane.) These oven gradients will result in inconsistent parts every cycle, ultimately increasing reject rates and costs.
The solution is to use forced air convection ovens in the dipping process. At Piper, we’ve been designing and improving on our custom forced air convection ovens for over two decades. Using either natural gas or electricity as an energy source, we believe we have the best ovens in the industry. Our well designed heat chambers, efficient ductwork and plenums, and controlled circulation enable us to maintain exceptional temperature stability AS WELL AS convection air velocity stability across the two dimensional (XY) dipping array. This ensures that all parts in the two dimensional dipping array heat uniformly.
Finally, we utilize custom tuned PID controllers, which enable us to maintain our temperature setpoint to ±1°F.