Veloplats Machinery Blown film extrusion plants are industrial-scale manufacturing facilities used to produce plastic films through the process of blown film extrusion. These plants typically consist of several interconnected components and machinery designed to melt, shape, cool, and wind plastic resins into films of varying thicknesses and properties.

Here’s an overview of the key components and processes involved in blown film extrusion plants:

Extruder: The extruder is the heart of the blown film extrusion plant. It consists of a screw mechanism housed within a barrel. Plastic resin pellets are fed into the extruder, where they are melted and mixed to form a homogeneous melt. The extruder applies pressure to push the molten plastic through a die, forming a tubular film.

Die Head: The die head is a critical component that shapes the molten plastic into a tubular form as it exits the extruder. Die heads come in various configurations, including standard annular dies and specialized spiral mandrel dies, which influence the film’s properties and characteristics.

Air Ring: The air ring surrounds the emerging tubular film and supplies a controlled flow of air to cool and stabilize the film as it expands. The design and operation of the air ring play a crucial role in controlling film thickness, bubble stability, and cooling rates.

Bubble Cooling System: After exiting the die head, the tubular film expands into a bubble, which is cooled using a bubble cooling system. This typically involves a combination of air cooling and water quenching to rapidly solidify the film and maintain dimensional stability.

Take-off Unit: The take-off unit consists of rollers or belts that pull the cooled film upwards at a controlled speed, stretching it to the desired width and thickness. This section also provides tension control to ensure uniform film properties and dimensions.

Nip Rolls: Nip rolls compress the film to ensure proper lay-flat characteristics and surface finish. They also provide the necessary tension for subsequent processing steps, such as printing, slitting, or winding.

Winder: The winder is the final component of the blown film extrusion plant, responsible for winding the film onto rolls of specified lengths and diameters. Various winding configurations are available, including surface winders, turret winders, and center winders, depending on the application and desired roll format.

VELOPLAST MACHINERY Blown film extrusion plants can produce a wide range of plastic films used in various industries, including packaging, agriculture, construction, and healthcare. The flexibility and versatility of the process make it suitable for producing films with different properties, such as barrier properties, strength, clarity, and printability, to meet specific application requirements.