PVC CLING FILM LINE-Extru-tech
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Transcript of PVC CLING FILM LINE-Extru-tech
Presented byAjay Beniwal
Extru-tech Solutions Inc., Canada
PVC Cling Film Technology
PVC CLING FILM LINEPVC
CompoundingConveying
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
Recycling- There is no waste
OFF Specs Rolls
From Side
Cutting
Edge Trims
PVC Compounding
PVC Compoun
d
PVC Resin
DOA/DOP
ESOHeat
Stabilizer
Slip
Anti Fog
Critical Parts of the Machine1. Vacuum Loader for the powder2. Vacuum Hopper3. Vacuum Pump4. Screw Design5. Adaptor Design6. Die7. Winder
Compounding Unit
Vacuum Hopper
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.
Extruder and DieThe 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
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.
Thickness gaugeThis 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.
Slitter
Edge Trim Removal System
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.
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.
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.
Compression Chamber
Side Cutting MachineThis 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.
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.
Finished Product
Applications• Hand and Machine
wrapping of fruit and vegetable trays.
• Hand and Machine wrapping of Meat and poultry trays.
• Wrapping of Industrial goods.
Contact