Sealing apparatus for a packaging machine

摘要

A sealing mechanism for a form, fill and seal packing machine having box motion sealers suitable for forming seals in both continuously and intermittently advancing webs. The sealers are disposed on opposite sides of the web and are operable to reciprocate into and out of engagement with the web. The sealers are further supported on carriages moveable longitudinally along the web path. As a result, the sealers may be operated in the box motion in which the sealers actuate into engagement with the web as the carriages move longitudinally downstream at the web speed. The sealers remain engaged with the web for a time sufficient to form a seal in the web before retracting out of engagement. The carriages then return longitudinally upstream to initial positions. The box motion may be repeated to form a series of seals in the web.