FISCHBEIN PBC-6000, Руководство оператора, Страница: 56 / 82

FISCHBEIN
®
Co. MODEL PBC-6000™
OPERATOR’S MANUAL
REV. D 2005-03 56
9. QUALITY CONTROL GUIDE
The purpose of this section is to provide guidance for quality control departments in determining
their own specifications for bag closures. It also outlines the conditions and adjustments needed to
achieve the desired closure from the PBC 6000 system. The PBC has been designed to heat an
adhesive -coated flap and then fold the flap over 180
o
to seal the end of a bag top.
9.1 GENERAL CONDITIONS FOR A GOOD SEAL
CORRECT ADHESIVE TEMPERATURE
The temperature of the heater cartridges is determined and set based on the speed of the machine,
the type of bag material and adhesive used, the ambient temperature of the bag, and the room
temperature. Since any one of these factors may change through a working day, the seal should be
inspected on a regular schedule to ensure a strong seal to the bag surface. Always start from a
lower temperature and gradually increase as needed.
BAG SURFACE PREPARATION
As with most adhesives, the bonding surface must be clean and free of debris. If a residue
(powder, dust, moisture, oil) or product is left on the surface of the bag, near the bond area, the
adhesive will not make a good bond to the bag material. Operators handling the bag tops should
ensure that the bag is clean before it enters the PBC system. In dustier environments modifications
may need to be made to keep contaminants off the bag surface. The machine is equipped with an
air scrubber, which is positioned to blow clean, non-lubricated air across the seal area. If
contaminants are still preventing a good seal, the air scrubber can be adjusted (by its control valve)
to blow more air.
As the bag top enters the PBC system, its bonding surface should be flat and free of wrinkles. The
machine will make a few small wrinkles within the creaser area, but operators need to ensure that
the bags are not wrinkled before entering the machine.
Most PBC bags are made so that their glue will adhere to the bag surface. If the bag has a high
gloss surface, the bag manufacturer usually provides an area along the bag, which has been
prepared for the hot glue. Test the bags to be sealed to ensure a compatible combination that will
produce a strong seal.
PROPER BAG PRESENTATION
Part of the success of sealing a bag top is presenting it to the PBC 6000 at the correct height and
parallel to the sealing line of the machine. The PBC must be aligned with the conveyor in order to
receive the bag top at the correct height and so that the crease line is parallel to the seal line. If the
crease is located in the wrong area of the bag top, it may not completely seal. To seal the top of
the bag, the seal, flap and creaser lines must be parallel to the conveyor.
Bags entering the system must not have large wrinkles. Large wrinkles in the bag top flap will not
provide a complete seal.