High-Speed T-Shirt & Bottom Seal Bag Converting: Servo Drive Timing, Optical Photocell Tracking, and Hydraulic Die-Cutting

1. Modern Bag Converting Principles

Automatic bag converting machines transform tubular blown film rolls into finished retail T-shirt bags, flat produce bags, or bottom-seal trash sacks at speeds up to 350 bags per minute per lane.

2. AC Servo Motor Drive Feed Motion

Legacy mechanical bag machines relied on mechanical eccentric cranks to regulate bag length. Ashal modern converting lines utilize Panasonic AC servo motors linked directly to high-friction rubber feed rollers. Servo drive precision enables micro-second start-stop acceleration, eliminating film stretching while maintaining bag length accuracy within ±0.5 mm.

3. Photocell Print Mark Tracking

For printed film converting, high-sensitivity German Sick photocells detect printed color registration marks. The central PLC calculates color mark spacing in real-time, automatically adjusting servo feed pulses to guarantee exact cut placement.

4. Hydraulic Punching & Waste Scrap Handling

T-shirt bag handle cutting requires high tonnage impact force. Ashal TG Series machines integrate dual hydraulic punch cylinders operating at 5 tons force. Punched handle waste scrap is automatically blown into a collection cyclone hopper for 100% recycling.