Machinery News

Liquid PIB cling film

Indian extrusion machinery maker Kabra Extrusiontechnik (KET) recently supplied a three-layer blown film line for stretch cling film that features liquid PIB (polyisobutylene), which characterises the stickiness of the film. This property of the film helps it cling to the product to be wrapped. Liquid PIB is said to be a better recipe component compared to masterbatch as it is less costly as well as able to facilitate optimum output and cling film quality. Furthermore, different levels of tackiness can be obtained by changing the feed rate.

At a trial run, the line used different combinations of LLDPE for the film, which had a layflat width of 1,000 mm and thickness of 20 microns. An output of 135 kg/hour was produced. Other features of the line are the two-station semi-automatic duplex sheet surface winder with wound roll capacity of 900 mm diameter/400 kg and special trip handling system.

The line also features two 55 mm extruders and one 65 mm extrude, a three-layer conventional cylindrical spiral die of 330 mm, dual lip air ring and ten HP AC blowers to enhance the optical and mechanical properties of the film. A vital feature is the oscillating haul-off, for optimal gauge randomization, with nip rollers of 1,400 mm width to achieve maximum layflat width. The horizontal-type nip, with PLC-based controls, is fitted with large-diameter Teflon-coated turn bars with air cushioning and large guide rollers to ensure wrinkle free film, says KET.