Optimization of PE/Binder/PA extrusion blow‐molded films. I. Heat sealing ability improvement using PE/EVA blends

Poisson, Charles; Hervais, V.; Lacrampe, Marie‐France; Krawczak, Patricia

doi:10.1002/app.22405

Cited by 18 publications

(43 citation statements)

References 17 publications

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“…In contrast, peelable PE seals necessitate sealant modifications, typically addition of an immiscible and lower softening temperature polymer-such as polybutylene, methyl acrylic acid or methyl acrylate ethylene-copolymers, ionomers, and/or EVA copolymers. [5,6] Such blends, beyond the obvious decrease in seal initiation temperature, also lead to an apparent reduction in area of bonding, and thus to reduced seal strengths. This affords for peelable seal strengths to form over a broader temperature range (5 to 15 8C wide) compared to the much narrower (less than 5 8C wide) range for the respective PE.…”

Section: Resultsmentioning

confidence: 99%

“…Empirically, [12,13] a seal strength of 0.77 N per cm width of seal (ca. 200 g Á inch À1 ) is considered as the onset of hermetic seal formation, [6,7] heat sealing curve, progressing with increasing temperature from noseal (seal strength below 1 N Á cm À1 ), to peelable seals over a narrow temperature range, to weld/fused seals at higher temperatures. (b) The PE/EVA/MMT achieves peelable heat seals over a very broad range of sealing temperatures, [14] independent of the substrate sealed on.…”

Section: Resultsmentioning

confidence: 99%

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Polyethylene Nanocomposite Heat‐Sealants with a Versatile Peelable Character

Manias

Zhang

Huh

et al. 2008

Macromol. Rapid Commun.

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A novel heat-sealing performance is achieved by polyethylene (PE) nanocomposites reinforced by ethylene vinyl acetate (EVA) and montmorillonite (MMT). Appropriate nanocomposite design leads to hermetic seals with a general peelable/easy-open character across the broadest possible sealing temperature range. Observations of the fracture seal surfaces by infrared spectroscopy and electron microscopy reveal that this behavior originates from a synergistic effect of the EVA copolymer and the montmorillonite clay nanofiller. Namely, the combination of EVA-copolymers and MMT nanofillers provides sufficiently favorable interactions for nanocomposite formation and mechanical robustness, but weak enough interfacial adhesion to promote a general cohesive failure of the sealant at the EVA/MMT interfaces.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Polyethylene Nanocomposite Heat‐Sealants with a Versatile Peelable Character

Manias

Zhang

Huh

et al. 2008

Macromol. Rapid Commun.

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“…As the addition of EVA increased, the heat sealing strength rose. EVA has a high ratio of the amorphous phase, which caused the 2 heat sealing layers to more easily penetrate each other during the coextrusion process and their molecular chains to tangle more closely together . As the EVA amount increased, the amorphous region was enlarged.…”

Section: Resultsmentioning

confidence: 99%

“…13 heat sealing layers to more easily penetrate each other during the coextrusion process and their molecular chains to tangle more closely together. 34 As the EVA amount increased, the amorphous region was enlarged. Therefore, the heat sealing strength increased.…”

Section: Tensile Propertiesmentioning

confidence: 99%

Preparation and properties of quercetin‐incorporated high density polyethylene/low density polyethylene antioxidant multilayer film

2018

Packag Technol Sci

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High density polyethylene/low density polyethylene (LDPE) antioxidant multilayer films were prepared by the co‐extrusion method, and quercetin was incorporated in the LDPE layers as an antioxidant. The release rates of quercetin and the antioxidant activities of films were adjusted by changing the amount of ethylene vinyl acetate (EVA) and diatomite added into the LDPE active layer. The morphologies of the films were observed by SEM, and the release property of quercetin was characterized by a high‐performance liquid chromatography (HPLC) method. The mechanical properties and heat sealing performance of the films were influenced to a certain extent by the amounts of EVA and diatomite in the active layers, while the barrier properties of the films were almost unchanged. The release of quercetin from the active films to a food simulant (95% alcohol) at 37°C was measured over 55 days. When the EVA amounts were 30% and 40% to 50%, the diffusion coefficients, D, were 10−14 and 10−13 cm2/s, respectively. In addition, the antioxidant activity values of the films were enhanced as the EVA amount increased. When adding diatomite into the active layer with 50% EVA, the diffusion coefficient, D, was 10−11 cm2/s, and the quercetin was almost completely released with a partition coefficient, K, of less than 1. Meanwhile, the antioxidant activity values of the films exceeded 95%. The antioxidant release rate could be adjusted within a wide range; thus, these active films could be used for food antioxidant protection.

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“…However, studies on correlation of physical properties and final seal performance of LDPE/EVA blends in open literature are limited. Studies on PE/EVA blends in amultilayer structure showed the effect of incorporating al ow content vinyl acetate EVA (9 %) in seal layer and tie layer (Poisson et al, 2006a;Poisson et al, 2006b;Zhang et al, 2009). In this work we investigate the effect of EVA incorporation in monolayerPEsealant for several compositions produced by the film blowing process.…”

mentioning

confidence: 99%

Sealability and Seal Characteristics of PE/EVA and PLA/PCL Blends

Najarzadeh

Tabasi

Ajji

2014

International Polymer Processing

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Seal strength behavior of low density polyethylene and ethylene vinyl acetate copolymer (PE/EVA) blends as well as that of blends of as eal grade PLA with aliphatic polyester (PCL) was studied. Polyethylene is commonly used for seal application in packaging multilayer structures and amorphous PLA is considered to be its counterpart for compostable and/or biodegradables ones. Incorporation of EVA in polyethylene improves its sealability in terms of ad ecrease in seal initiation temperature and broadness of sealability plateau. This was interpreted as due to the formation of finer crystals, adecrease in the melting point and presence of vinyl acetate polar group. These were supported by results obtained from differential scanning calorimetry (DSC) and Scanning electron microscopy (SEM). For the PLA/PCL system, the dispersed phase was stretched into elongated ellipsoidald omains. This type of morphology affected the mechanical and seal properties of the blends. As aresult of blending, both hot-tack initiation temperature and strength as well as seal initiation temperature were enhanced. The enhancement in these seal properties was significant when the concentration of the dispersed phase exceeded 20 wt% in the blend. Hot-tack strength of up to twice of pure PLA was achieved through blending. This was attributed to the lower glass transition temperature of PCL, resulting in enhanced mobility of PLA chains and also the high aspect ratio of the dispersed phase. The maximum obtained hot-tack strength (1 200 g/25 mm) at 40 %d ispersed content compared advantageously to commercially available polyolefin based sealant resins. The seal and hottack initiation temperatures were shifted to lower temperatures by as much as 30 8 C, which can allow faster and more energy efficient sealing process. 1I ntroductionHeat sealing is an important operation in packaging. Modern vertical and horizontal form fill seal (VFFS and HFFS) machines have aneed for operating at higher speeds. This requirement and the fact that the final package integrity is ultimately dependent on the results of the sealing process requires that the polymers used for the seal layer have superior hot-tack strength, low seal initiation temperature and wider sealing temperatures range. Although resin suppliers provide awide range of resins for the seal layer, with avariety of performances and physical properties, materials optimization is still achallenge. This challenge is even greater when the production line aims to use biodegradable materials which still cannot provide as superior properties as commercially available resins. Achieving sufficient adhesion upon sealing two semicrystalline polymer films in the fully or partially molten state is mainly ascribed to chain interdiffusion across the interface, amorphous fraction of material, and polymer chain functional groups.Coextrusion of low density polyethylene (LDPE) and ethylene vinyl acetate copolymer(EVA) has been used in industry to tailor as ealant layer. However, studies on correlation of physical properties ...

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Optimization of PE/Binder/PA extrusion blow‐molded films. I. Heat sealing ability improvement using PE/EVA blends

Cited by 18 publications

References 17 publications

Polyethylene Nanocomposite Heat‐Sealants with a Versatile Peelable Character

Polyethylene Nanocomposite Heat‐Sealants with a Versatile Peelable Character

Preparation and properties of quercetin‐incorporated high density polyethylene/low density polyethylene antioxidant multilayer film

Sealability and Seal Characteristics of PE/EVA and PLA/PCL Blends

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