Webster Griffin Ltd
Brooklands Park
Farningham Road
Crowborough,  TN6 2JD
England (UK)

T +44 (0) 1892 664250
F +44 (0) 1892 664340
E info@webstergriffin.com

> Home > Our Machines > Form Fill Seal > Flat Film versus Tubular Film
Flat Film versus Tubular Film
  Form Fill Seal Flat Film versus Tubular Film  

Advantages of Velocity Flat Film Technology from Webster Griffin

  • Simpler operating concept
  • Less moving parts, more robust - tubular machine has many bearings, linkages, cylinders, sensors, switches and intricate control system
  • Easy to understand and maintain – consumes few spares
  • More compact and requires less floor space and headroom
  • Suitable for packing sticky, non free flowing or lumpy products because does not “funnel” the product through a narrow filling spout
  • 3 seal technology - across top, bottom and down back of bag – requires 100-140 micron thick film
  • 3 seal technology – provides totally unrestricted flow of product into bag through forming tube with same cross sectional area as bag
  • 3 seal technology – back seal can be overlapped to make valve allowing entrained air to be squeezed out of full bag
  • 3 seal technology makes continuous tube allowing the packing of dusty products and fine powders, such as cements, because the dust does not touch the area of the film which will be sealed
  • 3 seal technology allows fine powders to be de-aerated in forming tube – before moving down into bag
  • Chilled air cooling of seals (refrigeration unit included) provides reliable film sealing at high speeds with thin films
  • Makes bag from a 500 kg roll of flat film which can be printed across its complete width in full colour – therefore, message is displayed on both sides of bag
  • Flat film is available from many manufacturers who will fight for business – tubular film available from fewer suppliers who control prices
  • Running at 1200 bags/hr – 500 kg film roll changed every 3½ hrs
  • Film roll change – takes 3 mins
  • Change from 5 kg to 50 kg bag in 20 mins with only one change part
  • Machine makes pillow and gusseted “block-end” bags
  • Bag length and width can be adjusted while packing (bag width variable - on machine fitted with gusset making device)
  • Can make 2-10 kg bags with handles (optional attachment)
  • Does not “clamp” neck of bag on to a filling spout, therefore:

-  Filled bags are 150 mm shorter than bags made on tubular machine = reducing film consumption by 15%-20%
-  Shorter bags mean that palletised stack to bag is more stable

  • The horizontal sealing jaws make a seal very close to the product in bag – giving a tight package good for palletising
  • Use 100-130 micron film (tubular machine needs 140-160 micron film, so its “pincers” can hold onto the top of the bag) – thinner film = lower film consumption
  • The machine is less expensive
  • Full colour – user friendly “touch screen” operator panel

-    44 pre-set packing programmes (each with 19 variables – bag size and width, packing speed, shaking, de-aeration, temperature settings for film sealing, etc.)
-    Displays:- Throughput and performance data - per batch, per grade, per bag weight
-    Bag quantity countdown – alarm gives warning when maintenance required or Teflon needs changing
-    Constant display of machine speed bags/min
-    Alarms and warning signals, i.e. “Replace Film Roll”
-    Fault finding and diagnostics