Basic description of the Gainsborough vertical
form fill and seal machine with belt drive film feed
Flat single web packaging material is loaded on a
spindle at the rear of the machine. It is then fed through the machine
over a series of rollers where it can be overprinted (sell by date/code
etc.) and registered for printed films.
The flat packaging film is then folded round to form
a tube to the required finished width of bag by a stainless steel
forming shoulder. At the same time, product can be dropped through
the middle of the formed tube to fill the bag. Product contact parts
are always stainless steel.
The forming shoulder incorporates a stainless steel
tube, which is used as:-
(1) A backplate to form the vertical seal or back
seal of the bag.
(2) A backplate for a pair of electrically driven belts to grip
the film and pull it through the machine.
(3) To feed the product into the bag (as above).
The vertical seal is formed by a heated bar which
presses onto the film while stationary. The drive belts then push
the formed tube of material through a set of heated horizontal jaws
by the required length of bag.The jaws are then closed to seal the
bag and a knife cuts it from the formed tube of material, at this
time it is usual for the next product to be delivered down the tube
on top of the closed jaws. When the jaws open the completed bag
falls onto a chute or conveyor out at the front of the machine.
The machine functions are normally electrical and pneumatic controlled
by a P.L.C. or custom built Micro-system.
Copyright © 2004 Gainsborough Engineering