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Product

Pro-Pack Pvt Ltd, is a company which makes 3 layer blown film. Our company specializes in making Shrink film & Strech film, which is used in the packaging of various products. We are an ISO 22000:2005 certified company.

Pro Pack offers you an exceptional choice of plain collation shrink film for all your pack collation requirements. These shrink films are ideal for the food and drink sectors, among many others. Our shrink films help ensure the safe transportation, storage and display of products, collating a number of items within one pack.

Our lightweight and low-cost collation shrink films shrink to fit using standard heat processes, holding products both securely and economically. Our mission: To tailor a company with the flexibility to fill orders of all kinds and to consistently provide our customers with a superior product, outstanding customer service, and the quickest turn around in the industry.

Blown Film

One of the most common methods of film manufacture is Blown Film (also referred to as the Tubular Film) Extrusion. The process involves extrusion of a plastic through a circular die, followed by "bubble-like" expansion. The principal advantages of manufacturing film by this process include the ability to:

  • Produce tubing (both flat and gussetted) in a single operation
  • Regulation of film width and thichness by control of the volume of air in the bubble, the output of the extruder and the speed of the haul-off
  • Eliminate end effects such as edge bead trim and non uniform temperature that can result from flat die film extrusion
  • Capability of biaxial orientation (allowing uniformity of mechanical properties)
  • Blown Film Extrusion can be used for the manufacture of co-extruded, multi-layer films for high barrier applications such as food packaging.

The Process

Plastic melt is extruded through an annular slit die, usually vertically, to form a thin walled tube. Air is introduced via a hole in the centre of the die to blow up the tube like a balloon. Mounted on top of the die, a high-speed air ring blows onto the hot film to cool it. The tube of film then continues upwards, continually cooling, until it passes through nip rolls where the tube is flattened to create what is known as a ' lay-flat' tube of film. This lay-flat or collapsed tube is then taken back down the extrusion ' tower' via more rollers. On higher output lines, the air inside the bubble is also exchanged. This is known as IBS (Internal Bubble Cooling).

The lay-flat film is then either kept as such or the edges of the lay-flat are slit off to produce two flat film sheets and wound up onto reels. If kept as lay-flat, the tube of film is made into bags by sealing across the width of film and cutting or perforating to make each bag. This is done either in line with the blown film process or at a later stage.

Typically, the expansion ratio between die and blown tube of film would be 1.5 to 4 times the die diameter. The drawdown between the melt wall thickness and the cooled film thickness occurs in both radial and longitudinal directions and is easily controlled by changing the volume of air inside the bubble and by altering the haul off speed. This gives blown film a better balance of properties than traditional cast or extruded film which is drawn down along the extrusion direction only. 

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