When specifying a new form fill seal bagger, the primary mechanical decision is choosing between intermittent and continuous motion jaw architectures. While intermittent vffs systems are reliable and cost-effective for moderate outputs, high-throughput plants requiring 100+ bags/min must deploy continuous high speed vffs kinematics.
1. Intermittent Motion: Stop-and-Dwell Sealing
In intermittent baggers, the film pulling belts pull a pouch length and stop completely. The cross-sealing jaws clamp, seal, cut, and reopen while the film is stationary. Speed is mechanically limited to 40–70 bags/min due to film tensile strain during rapid start-stop cycles.
2. Continuous Motion: Flying Cross-Jaw Tracking
Continuous baggers pull film non-stop. The cross-sealing jaws travel in a synchronized orbital or D-cam motion, clamping the film while moving downward at identical web velocity. This smooth motion achieves speeds up to 120–160 bags/min with zero web snapping.
Can fragile products be packed on continuous motion VFFS machines? +
Yes, because the film is moving continuously without sudden halts, products drop smoothly into the pouch without bouncing or shattering.
Is seal dwell time sufficient on high-speed continuous baggers? +
Servo-controlled D-cam kinematics maintain jaw contact over an extended vertical travel path, providing ample dwell time for hermetic heat sealing even at 120 bpm.
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