blown film extrusion

blown film extrusion

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Contact 9730175469 / 9730173696.

Here you will get basic information about Blown film extrusion, for more details, click here

Basic requirements for Blown film extrusion:

• Land: 5000 sq. Ft.
• Electricity: 50hp
• Manpower: 4 to 5

Raw material requirements:

• LDPE/LLDPE
• Printing ink
• Packaging materials

Machinery requirements:

• Three layer co-extrusion blown film plant with three single screw 47 mm extruder and accessories.
• Corona surface treatment plant
• Three/four colour RotaGravure Printing Machine
• Sliter-cum-regrinder machine

Manufacturing process:

Raw materials are fed into the hopper, which gets heated in the barrel with the help of the heater. The melt in the extruders is conveyed forwarded by the screw rotation. The three extruders individually feed the three channels within the die. All the flow channels converge into a single flow channel, just a little distance before the material is blown out from the annular die orifice.
The rotating die ensures even distribution of the melt flow while coming out of the die orifice. The rotating die ensures even distribution of the melt flow while coming out of the die office. The bubble is cooled by means of air circulation arrangements. The pre- determined size of the blown film is obtained by inserting compressed air through the die. Iris rings, flattering boards, counter rotating nil rolls draw the film upwards and flatten it into a two layer lay flat film, which is wound on the winder. The film is also treated with corona discharge equipment and then printed on flexography or rotogravure printing machine in desired colours.

Source:

https://www.dcmsme.gov.in/publications/pmryprof/chemical/ch9.pdf

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