Correlation between thermal behavior of a sealant and heat sealing of polyolefin films

Mazzola, Nícolas; Cáceres, Carlos Alberto; França, Marcos Pini; Canevarolo, Sebastião V.

doi:10.1016/j.polymertesting.2012.06.013

Cited by 27 publications

(21 citation statements)

References 6 publications

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“…Among these techniques, successive self‐nucleation and annealing (SSA) is the most sensitive, since it can provide faster and more efficient fractionation than other techniques. The SSA thermal protocol was designed and implemented for the first time by Müller et al in 1997 and its use has become widely spread in the past decades …”

Section: Introductionmentioning

confidence: 99%

Application of SSA thermal fractionation and X-ray diffraction to elucidate comonomer inclusion or exclusion from the crystalline phases in poly(butylene succinate-ran-butylene azelate) random copolymers

Arandia

Múgica

Zubitur

et al. 2016

J. Polym. Sci. Part B: Polym. Phys.

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Poly(butylene succinate‐ran‐butylene azelate) random copolyesters were thermally fractionated by successive self‐nucleation and annealing (SSA). The samples before and after SSA were analyzed by differential scanning calorimetry (DSC) and X‐ray diffraction (WAXS and SAXS). WAXS results indicate that a small degree of comonomer inclusion is present in the crystalline phases that are formed in the copolymers depending on composition: a PBS‐like unit cell or/and a PBAz‐like unit cell, thus confirming the isodimorphic behavior of the samples. SSA on the other hand demonstrated that the degree of comonomer exclusion during crystallization is far larger than comonomer inclusion, as judged by the increase in fractionation degree with compositions leading to the pseudo‐eutectic point. Furthermore, WAXS, SAXS, and SSA results show that the isodimorphic behavior is not highly dependent on kinetic factors, as the degree of comonomer inclusion or exclusion in the samples was not significantly altered by SSA thermal fractionation, a thermal treatment that promotes annealing and molecular segregation of defects to the amorphous regions of the material. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 2346–2358

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Section: Introductionmentioning

confidence: 99%

Application of SSA thermal fractionation and X-ray diffraction to elucidate comonomer inclusion or exclusion from the crystalline phases in poly(butylene succinate-ran-butylene azelate) random copolymers

Arandia

Múgica

Zubitur

et al. 2016

J. Polym. Sci. Part B: Polym. Phys.

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“…At the beginning of the sealing process, the correlation is clear, because it is easier to melt polymer chains with short ethylene backbones. This is also true for random copolymers, because the crystal is not perfectly formed with a homogenous distribution of comonomer , and it was observed for LL and mPE1, but it was not so clear for mPE2. The monomer average sequence and MD for mPE2 is almost the same as mPE1, but the sealing performance is slightly different.…”

Section: Resultsmentioning

confidence: 97%

Polyethylenes in blown films: Effect of molecular structure on sealability and crystallization kinetics

Moreira

Dartora

Santos

2016

Polymer Engineering & Sci

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Three types of polyethylene (PE), with different molecular structure, were selected and used in the production of films using a semi‐industrial blown film extrusion line. Carbon nuclear magnetic resonance and crystallization analysis fractionation tests were performed on the PE polymers to assess their molecular structure. Sealability properties of the films, as well as crystallization kinetics, were evaluated and the results are discussed according to the molecular structures of the polymers. It was found that distribution of short chain branching (average comonomer sequence nH or nO) on the backbone of the PE chains are the main factor controlling the beginning of sealability. The completely random placement of the comononer on the polymer backbone (monomer dispersity 100%) generated crystals with smaller size and a lower melting temperature. Sealing was controlled by crystal distribution, chain diffusion, and entanglement formation at the interface. PE with lower melting point and linear molecular structure showed greater hot tack strength. PE with long chain branching showed a delay on seal process leading to lower sealing speed. POLYM. ENG. SCI., 57:52–59, 2017. © 2016 Society of Plastics Engineers

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“…The lower the density, the lower the heat-sealing temperature, meaning packaging can be sealed faster or using reduced energy amount. The heat seal initiation temperature (HSIT) has been obtained when the surface temperature reached an amount of amorphous material of 77% for PE [12]. Lower heat seal initiation temperature means that crystal domains of PE microstructures are small and with multiple defects, being easily molten to create a flowing material for heat-sealing purposes.…”

Section: Sealantsmentioning

confidence: 99%

Packaging Design Alternatives for Meat Products

Mazzola¹,

Sarantópoulos²

2020

Food Processing

Self Cite

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This chapter connects the main requirements of meat product preservation with the most used plastic packaging structures, highlighting the role of packaging on the extension of food products shelf life and allowing their distribution and consumption in the most diverse areas of the world. An overview on the main degradation mechanisms of meat products is provided as background for the deeper discussions on flexible packaging films' compositions that is most used for meat packaging. Details on the performance of different sealing materials, gas barrier layers, and structural compositions as well as specific characteristics of packaging such as vacuum bags, shrink barrier bags, thermoforming, vacuum skin, and modified atmosphere packaging are discussed in this chapter serving as building blocks for an optimum packaging design, from food preservation to the final packaging end use. Finally, as part of an evolving world, new packaging trends are discussed, covering consumerism, sustainability, and functionality aspects.

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Correlation between thermal behavior of a sealant and heat sealing of polyolefin films

Cited by 27 publications

References 6 publications

Application of SSA thermal fractionation and X-ray diffraction to elucidate comonomer inclusion or exclusion from the crystalline phases in poly(butylene succinate-ran-butylene azelate) random copolymers

Application of SSA thermal fractionation and X-ray diffraction to elucidate comonomer inclusion or exclusion from the crystalline phases in poly(butylene succinate-ran-butylene azelate) random copolymers

Polyethylenes in blown films: Effect of molecular structure on sealability and crystallization kinetics

Packaging Design Alternatives for Meat Products

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