1. Presented by Ajay Beniwal Extru-tech Solutions Inc., Canada
PVC Cling Film Technology
Presented by
Ajay Beniwal
Extru-tech Solutions Inc., Canada

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

3. Recycling- There is no waste
OFF Specs Rolls
From Side Cutting
Edge Trims

4. PVC Compounding PVC Compound PVC Resin DOA/DOP ESO Heat Stabilizer
Slip
Anti Fog

5. Critical Parts of the Machine
Vacuum Loader for the powder
Vacuum Hopper
Vacuum Pump
Screw Design
Adaptor Design
Die
Winder

6. Compounding Unit

7. Vacuum Hopper

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.

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.

12. Slitter

13. Edge Trim Removal System

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.

17. Compression Chamber

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: microns, + 9% 2 sigma
Extrusion Output: kg/hr depending upon PVC compound, fluff and film thickness.
Line Speed (operational): Maximum 280m/min.

20. Finished Product

21. Applications Hand and Machine wrapping of fruit and vegetable trays.
Hand and Machine wrapping of Meat and poultry trays.
Wrapping of Industrial goods.

22. Contact