materials | Barrier film
4-PLY STANDARD FOIL STRUCTURE
12µm PET 9µm Foil 15µm OPA 76µm CPP
Foil-PET Bond Strength (g/in) CPP-OPA Bond Strength (g/in) OTR (cc/100in2 WVTR (g/100in2
/day) /day) 1360 >2000
>0.0005 >0.0005
3-PLY DURAMET® STRUCTURE
12µm PET
0.4µm Top-Coat 12µm Met PET
76µm CPP
Topcoat-PET Bond Strength (g/in) CPP-PET Bond Strength (g/in) OTR (cc/100in2 WVTR (g/100in2
/day) /day)
1393 1516
0.0048 0.0041
Celplast says that its Duramet film compares favourably with traditional four-layer barrier structures
By extracting gelatine materials from waste
materials from the fish industry, the researchers intend to produce coatings – in some cases, edible ones – that can also be incorporated into barrier packaging. The project also intends to synthesise new polyam- ides by fermenting household waste products
PET study Processing Technologies International (PTI) has released the findings of a study that it says proves the effectiveness of virgin PET as a barrier cap layer. It says that the study “reaffirms FDA guidelines for the use of virgin PET cap layers as functional barriers over PCR PET flake materials for direct food packaging use at room temperature”. The study, carried out in conjunction with Plastic
Technologies Inc and Container Science, found that a 1-mil-thick virgin PET cap layer meets the functional barrier requirements, eliminating surface contaminates within multilayer food packages made of PCR PET materials for room temperature (70F/21°C) applica- tions.
The study was prompted by a recent report by Frank Right: Total
demonstrated an 11-layer barrier film with partners at K2016
Welle of the Fraunhofer Institute for Process Engi- neering and Packaging (IVV), which questioned the efficacy of an ABA structure with PET recyclates behind a functional barrier – and suggested that the virgin cap layer may become contaminated during extrusion, rendering the functional barrier inadequate. The Fraunhofer report findings were based on
testing recycled PET packaging at temperatures as high as 212F/100°C, which PTI says is not within the guidance stipulated by FDA recommendations. “Our study set out to examine the elevated applica-
tion temperature relevance used as part of the Fraun- hofer assessment and reaffirm virgin PET for suitability
44 FILM & SHEET EXTRUSION | May 2017
www.filmandsheet.com
as a functional barrier and its corresponding FDA guidelines,” said Sushant Jain, senior scientist for applications and technology at PTI. PTI performed four different simulations that
modelled the production of a 40-mil-thick PET sheet with a 10/80/10% virgin/regrind/virgin layer structure at a combined rate of 2000pph. In each case, the results showed that virgin cap layers maintained its suitability as a functional barrier, said PTI.
Property prediction Nova Chemicals has updated its Bonfire multi-layer property predictor – which allows customers to predict the performance of complex film structures with up to nine layers. Enhancements in the new version include new
calculations, structure templates, reports for offline reference, and an expanded resin database – all of which saves customers time and resources when developing new structures and applications. “Predictive tools like Bonfire allow our users to
develop new structures more efficiently,” said Dan Ward, technical service specialist at Nova Chemicals. “We’re continuously developing new calculations and features for our interactive tools.” The predictor allows customers to simulate and
compare a wider range of structure design options than would be feasible with physical trials, and ultimately launch new applications more quickly and cost-effec- tively, says Nova. Customers can now use Bonfire to estimate bending
stiffness, which translates to converting line speeds. Calculations for machine direction (MD) tear and penetration energy will be added in the near future, and common structure types can be saved as templates for later use. For reference offline, Bonfire now allows users to
export their predicted structure data into a PDF report format, said Nova.
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