Glue Guard

GLUE GUARD

Electronic Glue Control

Run by microprocessor, it has been specifically designed to control the continuity and the regularity of cold glues, on straight line compact cartons, deposited by the rotating disc of the lower glue pot of a folder gluer machine. Sampling each 10mm of the glue flap at machine belt speed in excess of 450 metres/minute, is capable to detect glue in defect as well as in excess of established tolerances.
This equipment, designed to stop production at each "error", can easily be connected to an error monitoring unit (EDI + Ejector or Eject Guard + Ejector)

PERFORMANCES

Glue sensor	A high resolution 12 mm diametre capacitive sensor.
Type of cartons	Straight line compact cartons only (200/800 gr/m²).
Type of glue	Cold glues (vinyls) deposited by lower glue pot disc.
Sensor positioning	Sensor installed at approx. 0,5 mm from surface of glue flap and on opposite side to where glue is deposited (glue sensored through carton).
Error condition	The error condition is set off whenever a glue defect, of at least 10 mm is detected as: a reduction of glue mass superior to the set tolerances; excess of glue mass superior to the set tolerances; a gap of missing glue superior to 10 mm.
Machine stop	Programmable at the attainement of a number of consecutive errors comprised between 2 and 7 if the equipment is installed together with an "error" monitoring system.
Ejection memory	No available: this equipment, if installed on its own, will stop the folder gluer at each 1st error. Automatic ejection of wrongly glued cartons will require connection to an EDI + Ejector or Eject Guard + Ejector

Any malfunctioning, that could imperil the reliability of the required controls, is identified by the equipment self-diagnosis circuit which will automatically stop production and signal, on display, as well as through the optional external lamps, any of the following anomalous working conditions:

Encoder (MSD) signal absence: encoder damaged, encoder's wheel not in contact with the machine belt, encoder's wheel loose from encoder' shaft, cable's connectors (at either ends) disconnected or shortcircuited, cable cut off or sheared.
Anomalous glue sensor signal: sensor too far from glue flap, sensor smeared with glue, sensor damaged, sensor's cable or extension cable disconnected or cut off.
Signal absence of cartons detection photocell. This photocell has the purpose to confirm, to the equipment electronics, the transit of cartons through the machine. This signal is cross checked with that of the glue sensor and for any of these two signals missing is forseen the alarm for misfunctioning.
Wrong length of carton's flap: the equipment automatically retains in memory the flap length of the first carton which goes under the glue sensor. Any following carton not having this same length will cause the production stop.
Glue error: a glue flap found with a glue error (in excess, in defect, or missing) sets off an acoustic alarm which will result temporized (short buzz) if the Glue Guard is connected to an error monitoring unit (EDI or Eject Guard) or permanent when:
- the Glue Guard is not connected to an error monitoring unit;
- the Glue Guard, although connected to an error monitoring unit, has attained the number of consecutive errors programmed for production stop.
Machine running empty: it is the case when the Glue Guard receives just the signal from the turning encoder (MSD) and no cartons are detected by either the photocell or the glue sensor. In case both of these could have been removed, or result contemporarely damaged (almost impossible coincidence), a reference message on the LCD display, is forseen for this condition although, of course, not associated to the machine stop. Watch out: should this signalling appear during production, the operator must stop the machine and verify the reason of the absence of both the photocell and glue sensor signals!
Fault in the equipment hardware (including the self-diagnosis circuit): the relay, no longer activated by the good working conditions of the electronics, is released. The release of the relay will stop production. No message on display. Status of signalling lamps, if installed, unpredictable as they can be on or off in function of the extension of the electronics fault.

Made by DECA s.r.l.