machinery | Materials handling Polymers are quenched to an amorphous or low
crystalline state, and precise thickness tolerance is needed in both the machine direction (MD) and transverse direction (TD). After this, simultaneous biaxial orientation is
achieved through bubble inflation – where MD orienta- tion is controlled by differential nip roller speeds at both ends of the bubble, and TD orientation is controlled by blow-up ratio (BUR). Typical orientation ratios are 2.5-4.0x for MD, and 3.5-5.0x for TD. The third bubble stage is a heat-setting step that
Above: Kuhne says that its triple bubble process offers advantages over sequential bi-orientation
For instance, layer density was increased by around
20%, while there was also a reduction in the number of voids – which led to a 2.5x reduction in permeation rates. The reduction in void density also helped to reduce the likelihood of tensile failure, and boost mechanical strength.
Triple success Kuhne said that its triple bubble process for producing biaxially oriented barrier films can boost properties beyond those provided by sequential bi-orientation. The multi-stage blown film process produces biaxially oriented film over three phases: extrusion and quench- ing; simultaneous bi-orientation; and annealing. The first bubble stage includes “aggressive, multi-
stage quenching” using a water vacuum calibration unit. “This is a critical step for the subsequent simultane- ous biaxial orientation,” said Adolfo Edgar, VP of blown film systems for the US and Canada at Kuhne.
stabilises the film and sets the degree of shrinkage in the final product. This could vary from 30-70% (for shrink film) or 15% (for sausage casings) to 0-5% (for films). Kuhne says that properties such as water, oxygen
and aroma barrier, puncture resistance, optical clarity and stiffness can all be improved by using this process. The process can also eliminate edge trim – so there is no edge trim waste when co-extruding dissimilar materials.
“If edge trim is required – such as for finished rolls for shipping – it can be kept below 1%,” said Edgar.
Click on the links for more information: ❙
www.cosmofilms.com ❙
www.treofan.com ❙
www.jindalfilms.com ❙
www.bobst.com ❙
www.brueckner.com ❙
www.amiplastics.com ❙
www.ineos.com ❙
www.appliedmaterials.com ❙
www.kuhne-group.com
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