FLAT DIES | MACHINERY


Leading Technology for Film Manufacturers


Figure 3: Mueller has shown that nanolayering helps to improve the toughness of film


improved mechanical properties in the test lab, such as greater elongation at break[8]


. More importantly


perhaps, nano-layer film performance on the pallet evaluated with special test equipment has shown some interesting advantages like the increase in load retention and puncture resistance[9]


.


This gain can be used as a high-performance advantage or as an opportunity for downgauging, and Cloeren has used it to make a number of nano-layer stretch film structures. [10,11] The co-extrusion of barrier film is more complex. In


theory, it would be possible to obtain higher barrier properties when creating thin nano-scaled layers, as it could result in confined crystallisation of the barrier polymer as shown in the lab by Wang [12]


. The genera-


tion of high-quality, highly oriented crystalline struc- ture would result in the most tortuous path for the gas permeant (usually oxygen). However, when dealing with EVOH – a common


oxygen barrier polymer – the crystallisation behavior is complex and not well understood today. Some work by Kuraray shows that nano-scale EVOH layers with alter- nating nylon or tie layer results in lower EVOH crystallinity, when confining the EVOH layers with tie layers or nylon layers [13


]. The lower


crystallinity has negative effects on the overall barrier performance on one hand. On the other hand, the nano-layered structures showed some improvement for flex crack performance of EVOH.


Cloeren’s Nanolayer Feedblock creates layers sequentially,


with each layer formed by its own dedicated flow channel


www.goebel-ims.com www.filmandsheet.com April 2018 | FILM & SHEET EXTRUSION 27 12,000 mm ALUFOIL ASEPTIC PACKAGING FILM PAPER AND BOARD


TOBACCO PAPERS


Together the MONOSLIT GIANT and INTERSLIT cover a working width range from 6,000 mm to 12,000 mm. Each machine has unique features and properties. Combined with the trusted GOEBEL IMS quality we provide sophisticated technical solutions for the most challenging applications.


7,000 mm


�


24–27 April 2018 Booth 2J96


Shanghai // P.R. China


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