PET Preform

PET preform moulding demands a homogeneous, high-temperature melt delivered at high speed, yet processors often see inconsistent preform wall thickness, gate stringing, drooling and slow cycle times that limit output.

• 01PET’s high melting point and low melt strength make uniform plasticising difficult on general-purpose screws.
• 02Residual moisture in inadequately dried resin drives hydrolysis and intrinsic-viscosity (IV) loss.
• 03Worn screw flights and barrel bore reduce melt homogeneity and shot-weight repeatability.
• 04Insufficient L/D ratio and compression for PET leave unmelted pellets and temperature gradients.
• 05Poor nozzle shutoff leaves gate vestige and stringing after mould open.

• Achieving a uniform melt temperature window without overheating and generating acetaldehyde (AA).
• Maintaining intrinsic viscosity (IV) through controlled residence time and shear.
• Filling multi-cavity preform tools at high speed with consistent shot weight.
• Producing a clean gate break on every cycle to avoid vestige and contamination.

• 01High-L/D (24:1–26:1) barrier screws engineered for PET melting and metering uniformity.
• 02Bimetallic barrels that resist wear from any regrind or catalyst residue.
• 03Needle shutoff nozzles for positive, repeatable gate shutoff and clean break.
• 04Optimised compression ratio and metering depth to balance shear and throughput.
• 05Surface treatments (nitriding / PVD) that reduce melt adhesion and shear heat.