Many Engineering Plastics & Blends are available in world today but still over more than 70 years, Nylon-6 has maintained an impressive track record as a versatile, competitive material with a wide & increasing range of applications. Nylon-6 exhibits a combination of high stiffness & strength at elevated temperatures with toughness at low temperatures, resulting amongst others in high fatigue resistance and extremely good welding behaviour. On top of that, Nylon-6(like all polyamide) is resistant to a wide range of chemicals and allows much design freedom and the performance/price ratio is very competitive.
Nylon-6 of higher R.V. 3.0-3.5 is suitable for extrusion moulding of rods, monofilament, profiles, tubing & many more applications. For extrusion moulding generally a temperature of 30-40 degree Celsius above melting point is maintained. Care should be taken to control moisture of Nylon-6(CAPLON) below 0.1 %( 1000 PPM). If more moisture is present while moulding, then extruded parts may contain bubbles & result in degradation of mechanical properties. Residual monomer content also should be as low as possible to maintain desired melt viscosity. The residual time inside the extruder must be maintained and die without any dead space should be used.
Cylinder & die temperature should be maintained as given below:
|A.||Feed Zone||200-300 Degree Celsius|
|B.||Melting Zone||250-270 Degree Celsius|
|C.||Metering Zone||230-260 Degree Celsius|
|D.||Die Temp.||240-260 Degree Celsius|