Effect of Metallocene Polyethylene on Heat Sealing Properties of Low Density Polyethylene Blends

Sierra, Juan Diego; Osswald, Tim A.

doi:10.1106/yyfg-9kh1-r7qu-vk9h

Cited by 5 publications

(7 citation statements)

References 2 publications

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“…17 To evaluate the film crystalline orientation, reflection from (200) plane was selected by using azimuthal intensity distribution in Figures 7 and 8. The average square cosine angle, hcos 2 i, was calculated from the azimuthal intensities I() by equations (1) and 2, where is the angle between the machine direction and the normal vector of (200) plane at 2 ¼ 24.1 .…”

Section: Waxd and Dsc Analysesmentioning

confidence: 99%

“…In order to improve heat seal properties, sealant film materials such as low-density polyethylene, linear low-density polyethylene, and polypropylene co-polymerized with 2 to 5 mol% ethylene components can be laminated to the base film as a sealant layer. 1 Heat seal is a conventional technique used for joining polymer films used in packaging industries. The fundamental process is firmly pressing polymer film surfaces together by heat bars where molecular chains, in a partially molten state, can diffuse across interfaces.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The relationships between crystallization characteristics and heat sealing properties of high-density polyethylene films

Miyata

Ozama

Nishioka

et al. 2013

Journal of Plastic Film & Sheeting

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The relationships between crystallization characteristics and heat sealing properties of high-density polyethylene (HDPE) films were determined. HDPE with a 1.1 g/10 min melt flow index (MFI) (190 C, 2.16 kg) was melt mixed in a twinscrew extruder with a 0.04 g/10 min MFI HDPE. The high molecular weight HDPE (HMW HDPE) concentration was varied between 1 and 20 wt%. The HDPE blends were cast into a 50 mm thick film. The films were heat sealed at 125 C and 128 C. The seal bar pressure was kept constant at 0.13 MPa. The heat seal time was varied from 0.5 to 2.0 s. Heat-sealed strength was measured by T-peel test. The molecular structure development during the heat seal process was evaluated by differential scanning calorimeter and wide-angle X-ray diffraction. The HMW HDPE decreased the film heat seal strength when sealed at 125 C. However, at 128 C the presence of up to 10 wt% reduced the heat sealing time.

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Section: Waxd and Dsc Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The relationships between crystallization characteristics and heat sealing properties of high-density polyethylene films

Miyata

Ozama

Nishioka

et al. 2013

Journal of Plastic Film & Sheeting

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“…11,15,16 The purpose of this research was to study the thermal properties, rheology, morphology, and film properties of binary blends of EVA with an ultralow-densitymetallocene-based ethylene-␣-olefin copolymer. Because of their elastomeric character, ethylene-␣-olefin copolymers with densities below 900 kg/m 3 , such as the one under consideration, are commonly termed as polyolefin plastomers (POP) or elastomers (POE).…”

mentioning

confidence: 99%

Binary blends of EVA and metallocene‐catalyzed ethylene‐α‐olefin copolymers and their film properties

2003

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ABSTRACT:Blends of Ethylene-Vinyl Acetate (EVA) copolymer with a metallocene (single-site type) catalyzed elastomeric ethylene-␣-olefin copolymer have been investigated, with a focus on film applications. These blends were found to be immiscible in the melt and solid state, but mechanically compatible. EVA rich blends had a coarser morphology and showed more pronounced shear thinning and elastic behavior, suggesting better processability during the extrusion film blowing process. Ethylene-␣-olefin copolymer rich blends displayed finer morphologies, better tensile, heat seal, and optical properties and less extrudate swell.

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“…The values of film 1 are in between the values of its main components LDPE and mLLDPE in granulate form. In a previous study on blended films of LDPE and mLLDPE, it was found that the melting point of the blended monolayer was between the values observed for mLLDPE and LDPE films . The melting onset temperature of film 2 is decreased with 5° compared with film 1.…”

Section: Resultsmentioning

confidence: 84%

Evaluation and optimization of seal behaviour through solid contamination of heat‐sealed films

et al. 2019

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A method is presented to apply solid powder/granulate contamination (ground coffee and blood powder) in between the heat conductive seals of flexible packaging materials. A response surface method is tested and validated to optimize seal strength of heat conductive sealing with and without solid contamination. In this study, a maximal seal strength is defined as optimal. Using these methods, three typical packaging films with varying seal layer composition (metallocene linear low‐density polyethylene (LLDPE), plastomer, and sodium ionomer) are maximized towards contaminated seal strength. Contamination caused a decrease in seal strength and narrowed down the process window (seal temperature and time combinations) in which at least 90% of the maximal strength is obtained. The influence of seal layer composition on the clean and solid (ground coffee and blood powder) contaminated seal performance (seal strength, process window, and leak tightness) was evaluated. The film with the plastomer‐based seal layer outperformed the other films with respect to the width of the process window. It also reached a higher seal strength and a higher amount of leak tight seals (evaluated with the dye penetration test) after optimization. The hot tack test was evaluated as predictive test for the contaminated seal strength. The results of this study do not support an indicative relationship.

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Effect of Metallocene Polyethylene on Heat Sealing Properties of Low Density Polyethylene Blends

Cited by 5 publications

References 2 publications

The relationships between crystallization characteristics and heat sealing properties of high-density polyethylene films

The relationships between crystallization characteristics and heat sealing properties of high-density polyethylene films

Binary blends of EVA and metallocene‐catalyzed ethylene‐α‐olefin copolymers and their film properties

Evaluation and optimization of seal behaviour through solid contamination of heat‐sealed films

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