Every new PET preform mold should be trialed before full production. A trial finds problems while they are cheap to fix. Skipping it risks far bigger losses later.
What a Trial Run Checks
A proper trial checks fill balance across cavities. It checks neck dimensions and wall thickness. It checks clarity. No haze, no yellowing, no black spots.
The trial also confirms smooth running. Ejection is clean, nothing sticks, and cycle time holds steady. The hot runner must hold temperature across every nozzle.
T1 often exposes one cold nozzle or a tight neck ring. Both are quick fixes at this stage.
How a Trial Is Done
Trialing follows a set sequence. Barrel and hot runner temperatures start at the resin supplier’s recommendation. Then we verify against actual melt temperature. Mold temperature is read at the cavity surface, not on the controller screen.
Injection speed, pressure, and switchover point come next. Each change gets a short run. Holding pressure and cooling time come last.
Fixing Problems Early
Most trial issues are easy to correct. Raise a hot runner zone. Polish a gate. Rebalance the cooling. These fixes take hours or days.
The same problems in mass production mean scrapped preforms, missed deliveries, and emergency rework. Trial first, produce later. The math is simple.
Protecting Your Investment
A documented trial with sample approval protects both sides. Once you approve the samples, everyone agrees on the quality standard.
Serious suppliers trial as standard practice. They share the report with you. If a supplier resists testing, treat it as a red flag.
We trial every mold before shipment. You get the report and the samples.