Dispensing system with material spill prevention system

摘要

A material spill prevention system with feed location sensing system to reduce the possibility of material spillage relative to the film being utilized for bag formation. The material spill prevention system monitors whether there is a proper film feed situation and, if not, precludes the release of material from the dispenser as in by precluding a flow controller opening and the release of material to the bag intended to receive the release chemical (e.g., a foam packaging bag). The prevention system is applicable to a variety of film feed arrangements as in a C-fold film drawn by a nip roller arrangement from a roll source with the dispenser mechanism positioned intermediate the nip and film source relative to film travel. An embodiment of the spill prevention system also features an absolute position transducer for monitoring position of a flow controller which controls output of material from the dispenser.

主权项

1. A foam-in-bag system, comprising:
a foam-in-bag device that forms a plurality of foam-in-bag bags from opposing film webs of film material, the foam-in-bag device including:
a foam precursor dispenser having a dispenser outlet that distributes a foam precursor between the film webs;a drive assembly that drives the film webs past the outlet to receive the precursor, anda cutter that cuts the film webs to form the plurality of bags; and a monitoring system comprising a sensor having a detection location downstream of the dispenser outlet and the cutter that detects whether the film material is present at the detection location downstream of the dispenser outlet and the cutter, the monitoring system being configured to determine whether the film material has been detected by the sensor in a predetermined period, wherein the monitoring system is connected to the foam-in-bag device to cause the foam-in-bag device to preclude initiation of or discontinue distribution of the foam precursor by the foam-in-bag device based on the monitoring system determining that the film was not detected during the predetermined period.