A Rheological Model for the Prediction of Polyethylene Blown Film Properties

Kuijk, E. W.; Tas, PP Paul; Neuteboom, Peter

doi:10.1177/073168449901800603

Cited by 12 publications

(3 citation statements)

References 6 publications

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“…The influence of molecular orientation on the use properties of PE blown films has stimulated profuse studies on the processing–structure and processing–property relationships 4–31. Nevertheless, little has been accomplished in terms of understanding the influence of the molecular architecture on the structure and mechanical properties of films, via processing conditions.…”

Section: Introductionmentioning

confidence: 99%

Influence of the molecular architecture of low‐density polyethylene on the texture and mechanical properties of blown films

Guichon

Séguéla

David

et al. 2002

J Polym Sci B Polym Phys

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Three types of low-density polyethylene materials were investigated with respect to the influence of the molecular architecture on the mechanical and use properties of blown films. The materials were a branched polyethylene synthesized by free-radical polymerization under high-pressure (HP-LDPE), a linear ethylene-hexene copolymer (ZN-LLDPE) produced by low-pressure Ziegler-Natta catalysis, and an ethylene-hexene copolymer (M-LLDPE) from metallocene catalysis. The extrusion and blowing conditions were identical for the three materials, with a take-up ratio of 12 and a blow-up ratio of 2.5. The blown films displayed a decreasing puncture resistance in the order M-LLDPE, ZN-LLDPE, and HP-LDPE. In parallel, the tear resistance of the films became increasingly unbalanced in the same order of the polymers. The morphological study showed an increased anisotropy of the films in the same polymer order, the crystalline lamellae being increasingly oriented normal to the take-up direction. This texturing caused a detrimental effect on the mechanical properties of the films, notably increasing the capacity for crack propagation. The phenomenon was ascribed to the kinetics of chain relaxation in the melt that governed the ability of the chains to recover an isotropic state from the flow-induced stretching before crystallization. The puncture resistance was examined in terms of both texture and strain-hardening capabilities.

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Section: Introductionmentioning

confidence: 99%

Influence of the molecular architecture of low‐density polyethylene on the texture and mechanical properties of blown films

Guichon

Séguéla

David

et al. 2002

J Polym Sci B Polym Phys

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“…Various aspects of the blown film extrusion process have been studied from both modeling and experimental perspectives . Many studies have also attempted to correlate the mechanical properties and microstructures of the polymer film as a function of processing parameters .…”

Section: Introductionmentioning

confidence: 99%

Effect of processing parameters on essential work of fracture toughness of LLDPE blown films

2015

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Blown film process is one of the most attractive processes for producing low‐cost, high‐performance polyolefin films. In this study, mode‐I essential work of fracture (EWF) analysis and Elmendorf tear test were performed on m‐LLDPE films to investigate how different processing conditions influence blown film EWF and tear properties. After the EWF test, the film was carefully characterized, especially within the necked zone. Effects of frost‐line height, draw down ratio, blow‐up ratio, and haze‐zone region on the EWF parameters of the films were determined. Correlation between the EWF parameters and the films' Elmendorf tear properties was also made. The usefulness of the EWF test for investigating ductile polymeric blown films fracture performance is discussed. POLYM. COMPOS., 55:2403–2413, 2015. © 2015 Society of Plastics Engineers

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“…B LENDING CONVENTIONAL LLDPE with LDPE to produce film is widely established as a means to significantly improve various properties of LDPE [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Properties such as the impact strength and tear resistance of a typical LDPE film can be enhanced by the addition of LLDPE [4].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Downgauging on the Physicomechanical Properties of Film Blends of Linear Low-density Polyethylene with Low-density Polyethylene

Cran

Bigger

2005

Journal of Elastomers & Plastics

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Two series of film formulations are investigated comprising blends of a metallocene-catalyzed linear low-density polyethylene (mLLDPE) or a conventional linear low-density polyethylene (LLDPE) with a low-density polyethylene (LDPE). The physicomechanical and optical properties are studied at various gauge lengths to investigate the effects of downgauging the films, particularly those containing mLLDPE. The potential for downgauging is found to be optimum at higher levels of mLLDPE with the best results achieved for a film containing 40 wt.% mLLDPE at 60 mm. This formulation has significantly better properties than an analogous blend containing 40 wt.% LLDPE at 100 mm. The potential materials and cost savings associated with downgauging films is also briefly investigated.

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A Rheological Model for the Prediction of Polyethylene Blown Film Properties

Cited by 12 publications

References 6 publications

Influence of the molecular architecture of low‐density polyethylene on the texture and mechanical properties of blown films

Influence of the molecular architecture of low‐density polyethylene on the texture and mechanical properties of blown films

Effect of processing parameters on essential work of fracture toughness of LLDPE blown films

The Effect of Downgauging on the Physicomechanical Properties of Film Blends of Linear Low-density Polyethylene with Low-density Polyethylene

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