2. PVC CLING FILM LINE
PVC
Compounding
Conveying
to the
vacuum
hopper
Extrusion
through a
cast Die.
Casting the
film
Thickness
readout
(Optional)
Slitting and
Winding
Air Removal
in a
compression
chamber
Edge cutting
8. Effect of Vacuum
The difference can be clearly seen in the above picture
comparing the two melts with vacuum applied in the
hopper and without the vacuum.
9. Extruder and Die
The Screw design and the die are the most critical
parts in the whole process. The screw should be
capable of feeding properly melted and homogenized
melt to the die.
The die design is critical and there should be no dead
areas otherwise the melt will stay there for long time
and will degrade.
Die Supplier: JC Times, ADI
10. Cast Unit
Cast Unit is very simply designed with two
independently driven rolls which are highly polished
and chrome plated. The whole unit is sitting on casters
and can be easily moved out for maintenance and die
cleaning.
11. Thickness gauge
This is an optional item.
It’s common to have a manual lip adjustment for PVC
cling film dies. For better gauge adjustment the
thickness can be read out using a thickness gauge and
then the operator adjusts the gauge manually. This is
recommended if the customer is using various
compounds because the melt flow changes and it is
required to adjust proper die gap.
14. Edge Grinding for recycling
The edge trims are directly fed to a grinder where they
are chopped in fine flakes and can be added in the
PVC Compound. It is common to Process 20-25%
recycled material in the final film. Therefore, there is
no waste created in the production of the PVC Cling
film.
15. Winder
The Turret winder is quite common with the option for
easy changeover because the normal cycle time is 4-5
minutes.
Some suppliers also provide a combination of Surface
and Turret for easy changeover and high-speed.
16. Compression Chamber
The finished rolls from winder are directly transferred
in to a compression chamber to release the air trapped
between the individual layers during the winding
process.
18. Side Cutting Machine
This is the final process to make a jumbo roll for
commercial application.
The rolls wound at high speed has curled edges and it’s
difficult to unwind the film without tearing. These
curled edges are chopped out by the side cutting
machine.
There are semi and fully automatic machines available
in the market for this purpose.
19. General specification
Product: PVC Cling film (recipe will be supplied with the machine)
Material: Flexible PVC
Machine Face Width: 1800mm
Die Width: 1800mm
Finished Film Width: 1700mm
Max Roll Diameter: 10” (250 mm)
Film Thickness: 8 -15 microns, + 9% 2 sigma
Extrusion Output: 280-300 kg/hr depending upon PVC compound, fluff and
film thickness.
Line Speed (operational): Maximum 280m/min.
21. Applications
• Hand and Machine wrapping
of fruit and vegetable trays.
• Hand and Machine wrapping
of Meat and poultry trays.
• Wrapping of Industrial
goods.
