Shrink Wrap Machine

Overview

A shrink wrap machine encloses a product in plastic film and heats it until the film shrinks to a tight, glossy skin. This is an automatic two-stage system: an L-bar sealer wraps the product in centre-fold polyolefin film and seals it into a loose bag in one stroke, then a hot-air shrink tunnel pulls the film tight around the product. It is used for retail multipacks, printed cartons, software boxes, and any product that needs a clean, tamper-evident wrap.

The stations mount on a welded Frame & Cabinet on casters, and the Control Panel holds seal time, tunnel temperature, and conveyor speed on a touchscreen with PID control off tunnel thermocouples.

How it works

The Film Supply carries the centre-fold film roll, unwinds it under dancer tension, opens the fold over the product with a triangular plow, and perforates it so trapped air can escape during shrinking. The Infeed Conveyor then carries the product into the open film and onto the flat seal table.

At the seal table, the L-Bar Sealer drops a pivoting L-shaped hot wire that seals and cuts two film edges at once, the leading edge and the open side, leaving the product in a closed film bag and severing it from the web. A low-voltage sealing transformer drives the wire, and Teflon tape keeps molten film from sticking. The trimmed film matrix is wound away by the Scrap Rewind spindle.

The bagged product rides into the Shrink Tunnel, an insulated chamber where heaters and recirculation blowers blow hot air across all sides through a stainless mesh conveyor, shrinking the loose film to a tight skin in seconds. The Exhaust Hood hood vents hot air and film fumes from the tunnel exit.