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.

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