Injection Preform Mold

Some preform specifications require near-zero draft on the inner diameter for improved stretch-blowing consistency. Our Injection preform mold features highly polished, micro-textured core pins that allow reliable demolding with drafts as low as 0.1 degrees, without galling. This is achieved through a specialized DLC coating that reduces the coefficient of friction against the cooling PET.

The parting line of an Injection preform mold must resist both plastic pressure and clamp force. We incorporate pressure sensors in the cavity that monitor the exact moment of fill. The data is used to fine-tune the injection profile to avoid over-packing that could flash the mold while still compensating for material shrinkage, securing precise weight consistency.

To avoid jetting and "splay" marks, the gate design in this Injection preform mold transitions smoothly from the nozzle tip into the base. This promotes laminar melt flow that expands radially into the cavity, preserving optical properties. The result is a preform with a streak-free body, ideal for clear containers where any defect is a reject.

Every Injection preform mold we ship has undergone a complete dimensional and thermal validation. We provide a detailed report showing the temperature mapping under steady state, the pressure drop per cavity, and the weight variation histogram. This documentation proves that your Injection preform mold will perform from day one, giving you confidence in your supply chain.

At DEMARK, we focus on delivering PET preform molds and injection systems that combine efficiency, durability, and precision. Whether producing standard or lightweight preforms, our solutions are designed to improve output, reduce waste, and support sustainable manufacturing.