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Abstract

The experiment focused on blown film extrusion using polypropylene (PP), where the polymer was melted and formed into a thin tube that was inflated and cooled. The study examined how processing conditions, such as conveyor speed, affect the film's properties including thickness, strength, and flexibility. The final film quality is influenced by factors like temperature and air pressure, emphasizing the importance of precise control during production.

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11 views2 pages

Abstract

The experiment focused on blown film extrusion using polypropylene (PP), where the polymer was melted and formed into a thin tube that was inflated and cooled. The study examined how processing conditions, such as conveyor speed, affect the film's properties including thickness, strength, and flexibility. The final film quality is influenced by factors like temperature and air pressure, emphasizing the importance of precise control during production.

Uploaded by

gdpsarmad
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Abstract

The experiment used polypropylene (PP) to make blown film. The extruder was heated for 20–
25 minutes to 190–220°C. The polymer was fed in at 62 RPM, melted, and pushed through a die
to form a thin tube. Air was used to inflate and cool the tube before flattening it into a film. The
film was then placed in water for extra cooling and its thickness was adjusted with a roller. It
was rolled up using a winder, with thickness controlled by changing the conveyor belt and screw
speed. Two samples were made at conveyor speeds of 32 and 43 RPM, and their melting point,
density, and hardness were tested.
1. Introduction

Blown film extrusion is a common method used to make thin plastic films, which are widely
found in packaging, agriculture, and other everyday products. The process starts with melting a
plastic material, in this case, polypropylene (PP), which is known for being strong, flexible, and
lightweight. Once melted, the PP is pushed through a circular die to form a thin tube. This tube is
then inflated with air, like a balloon, to stretch it into the desired film thickness.

Cooling is a key step in making sure the film keeps its shape and quality. First, air rings cool the
film as it inflates. Then, to make it even more stable, the film is sometimes dipped in water. After
cooling, the film is flattened into sheets, adjusted for the right thickness using rollers, and finally
wound into rolls for storage and use.

The quality of the final film depends on various factors, like temperature, air pressure, and
machine speed. If these settings are not well controlled, the film might come out too thick, too
thin, or uneven. This study looks at how different processing conditions affect the film’s
properties, such as thickness, strength, and flexibility. Understanding and fine-tuning these
factors helps in producing high-quality polypropylene films used in industries worldwide.

Figure 1: Blown film extruder

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