Proprietary Hollow Die Technology

Internally-designed dies with precision-machined interchangeable forming mandrels ensure consistent wall thickness across the full sheet width. Eliminates common industry problems: thin spots, collapsed ribs, and dimension drift during long production runs.

Advanced Multi-Zone Vacuum Calibration

Multi-stage vacuum tanks with individually adjustable zones deliver superior geometry control — achieving flatness tolerance within ±0.15mm/m. Critical for applications demanding tight dimensional consistency.

In-House Core Manufacturing = 30% Cost Savings

Barrels, screws, hollow dies, calibration tooling, rollers — ALL manufactured by Jwell. No third-party outsourcing means full end-to-end quality control and pricing comparable to top German brands at roughly 30% lower total investment.

Proven Track Record — 80+ Lines in North America Alone

Since 1997, serving customers across 100+ countries. Our hollow sheet expertise spans every major market: packaging converters, signage manufacturers, construction suppliers, automotive Tier suppliers. We have seen and solved every hollow sheet production challenge imaginable.

Cause: Insufficient internal air pressure inside hollow chambers, or excessive haul-off speed pulling ribs out of shape before they fully cool

Fix: Increase internal air pressure gradually in 0.05 bar steps; reduce puller speed by 10-15%; check vacuum calibration tank suction level at each zone

Cause: Die lip gap imbalance across sheet width, off-center mandrel position causing asymmetric flow distribution

Fix: Recalibrate die bolt torque pattern at 10+ points; verify mandrel centering with feeler gauges; check die land parallelism with feeler gauges under 0.05mm tolerance

Cause: Melt temperature too low for stable flow, or excessive shear rate at die land creating melt fracture surface defects (sharkskin)

Fix: Raise barrel temps 5-10C near die exit; broaden die land gap if possible; add 0.5-1% processing aid masterbatch to reduce melt fracture onset

Cause: Asymmetric cooling between top and bottom skin surfaces causing differential shrinkage stress as the sheet cools unevenly

Fix: Balance vacuum tank water spray patterns on top/bottom equally; adjust haul-off nip roller pressure to be even on upper and lower rollers.

Cause: Inconsistent gravimetric feeding output, or screw surge from worn barrel-screw clearance allowing backflow variation

Fix: Verify gravimetric feeder accuracy within ±0.5%; check PID tuning on all temperature controllers; inspect screw/barrel wear gap — replace if >0.5mm clearance