Improving Barrier Through Orientation in Processing

Culter, John D.

doi:10.1177/875608798500100305

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…The lowest value found in the literature was 0.04 cm³(STP) 100 µm/(m² d bar) for an EVOH film with 27 mol% ethylene content . Although the effect of stronger barrier improvement of EVOH films by biaxial orientation in the case of low ethylene contents is described in the literature, the observed improvement is higher than the reported one.…”

Section: Resultscontrasting

confidence: 58%

Thin Laminate Films for Barrier Packaging Application – Influence of Down Gauging and Substrate Surface Properties on the Permeation Properties

2011

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A reduction in thickness of barrier laminated film systems generally leads to a quality decrease of the resulting packaging materials' functional properties. Especially for food packaging applications, adequate oxygen and water barrier properties are indispensable. The focus of this study was therefore the development of thin film systems using metallized aluminium or ethyl vinyl alcohol barrier laminates with low oxygen and water vapour transmission properties. Biaxially oriented polyethylene terephthalate and biaxially oriented polypropylene aluminium-coated thin film laminates as well as corresponding ethyl vinyl alcohol film systems could be successfully produced with oxygen transmission rates of <0.5cm³(STP)/(m² d bar) and water barrier values of <0.1g/(m² d). It could be confirmed that the film thickness of these materials within the range of the investigated dimensions does not have an influence on the barrier properties. In fact, the parameters of the production process influence the functional properties of the film systems and must therefore be adapted. Machinability of these excellent thin film systems requires further investigation on packaging lines before they can be transferred to packaging application.

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Section: Resultscontrasting

confidence: 58%

Thin Laminate Films for Barrier Packaging Application – Influence of Down Gauging and Substrate Surface Properties on the Permeation Properties

2011

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“…For the high MW HDPEs, the barrel zones were set at 190-210 C and the die zones at 199 C. For the low MW HDPEs, the barrel zones were set at 182-199 C and the die zones at 177 C. The quotient of draw ratio/frost line height was, however, kept the same for each set of films -19.0 and 25.4 mm. Therefore, the cooling process for the high and low MW films was very similar [3].…”

Section: Equipment and Processesmentioning

confidence: 97%

“…A 'four corners' design with high and low overall MWs and broad and narrow MWDs resulted (see Table 1). Density was kept constant at 0.965 gm/cm 3 .…”

Section: Equipment and Processesmentioning

confidence: 99%

HDPE Barrier Film Resins - MW and MWD Effects - and their Blends with mLLPDE

Cowell

Johnson

2002

Journal of Plastic Film & Sheeting

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High density polyethylene (HDPE) resins were produced via the multi-reactor, Mitsui, stirred slurry process to give a 'four corners' type of product matrix with high and low molecular weights (MW) and broad and narrow molecular weight distributions (MWDs). Density was kept constant. Film processing and physical properties -including oxygen, carbon dioxide, and water vapor transmission rates -are presented. Lower MW and narrower MWD favor better barrier properties. The best barrier HDPE resin was blended with mLLDPE and films blown from these blends demonstrated the potential for application specific film strength and optical property tailoring while maintaining high barrier performance.

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“…After orientation both materials develop a morphology with increased crystallinity, hence a much lower deterioration of barrier performances at high relative humidity. 14,15 Moreover, the films preparation using flat die clearly favours barrier performances of MXD6 at high RH, while the opposite occurs for film blowing. Table 1 reports, for instance, the Oxygen Transmission Rate (OTR) data obtained from promotional information of resin suppliers.…”

Section: Introductionmentioning

confidence: 99%

MXD6 in film manufacturing: State of the art and recent advances in the synthesis and characterization of new copolyamides

Vannini

Marchese

Celli

et al. 2019

Journal of Plastic Film & Sheeting

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Semiaromatic polyamides belong to a large family of polymers commonly utilized in demanding engineering applications due to a unique set of outstanding mechanical properties as well as in terms of thermal and chemical resistance. Somewhat less understood is the use of certain members of this family in packaging applications such as the manufacturing of films and sheets or thin-walled containers, as well as the motivations and limitations in designing film structures containing them. This article reviews how m-xylylene diamine (MXD)-based polyamides are used in packaging applications. Attention is also given to film manufacturing and criticalities in its processing. Recent developments in MXD-based polyamides for gas barrier applications are also reported, while examining future perspectives in speciality film manufacturing. The new described copolymers based on MXD6 were synthesized by introducing different co-units, like isophthalic acid, 2,6-naphthalenedicarboxylic acid, glutaric acid, oxalic acid or 1,6-hexamethylene diamine. The performed characterization analyses (DMTA, DSC, density and OTR) allowed the polymer structures and properties to be correlated. Introducing 2,6-naphthalenedicarboxylic acid along the MXD6 chain led to the highest Tg (101°C) and density (1.233 g/cm3) and the lowest OTR (0.0035 cm3·cm/m2·day·atm, up to one order of magnitude lower).

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Improving Barrier Through Orientation in Processing

Cited by 7 publications

References 14 publications

Thin Laminate Films for Barrier Packaging Application – Influence of Down Gauging and Substrate Surface Properties on the Permeation Properties

Thin Laminate Films for Barrier Packaging Application – Influence of Down Gauging and Substrate Surface Properties on the Permeation Properties

HDPE Barrier Film Resins - MW and MWD Effects - and their Blends with mLLPDE

MXD6 in film manufacturing: State of the art and recent advances in the synthesis and characterization of new copolyamides

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