Lid Heat Sealing Machine
In first step, cover & container touches each other & then hard back of partition forces to insert itself into cover molten plastic under sealing force.
If force is less then also it will leak at low air pressure, when tested. If traveling (retracting ) time is more, machine will not give jerk it will retract smoothly but by the time oxidation layer will be formed on molten plastic which will not allow to seal properly. So make sure oxidation layer is avoided to get best results. After sealing is done, Pole burning is done. In Pole burning pole post material should not be over heated otherwise it will be loose or vent will be created in between Post & PP Cover.
Few steps to be taken into consideration for best results:
Every time Fixture is replaced, make sure these are aligned in line center to center.
Proper Heat Control is required for proper Sealing. Heating Temp is the melting temp of particular plastics or it can be attained by hit & trail, Time for melting Plastics. These are interrelated but can’t be taken as replacement for each other i.e. you increase time and reduce heat control or vice versa.
Proper Setting of these parameters will give best result.(HMT process)
H for heat control.
M for MELTING to be adjusted by ADJUSTERS mounted on outside Hot Plate for container & ADJUSTERS mounted on outside stoppers of COVER fixture for to increase/reduce MELTING height for CONTAINER & COVER RESPECTIVELLY.
Heat control will vary according to INCOMING VOLTAGE, QUALITY OF PLASTICS.
Poles of cells should not be tight in the poles post of cover, these should have rubber washers to protect dropping of Lead while brazing pole.
These Machines are available in three Models to suit different production need:
