Predicting the Heat Seal Performance of Ionomer Films

Morris, Barry A.

doi:10.1177/8756087902018003002

Cited by 28 publications

(32 citation statements)

References 4 publications

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“…As the sealant layer begins to melt, more intimate contact or wetting of the sealing surfaces occurs. Given sufficient time, molecular segments diffuse across the interface forming entanglements, and thus the seal strength increases 4, 5…”

Section: Introductionmentioning

confidence: 99%

“…Constant heat sealing has such advantages as low power consumption, high speed, and less stress on the films. However, impulse heat sealing yields stronger and superior appearance of seals 5. In spite of a more complex temperature control, impulse heat sealing is the most widely used technique in vertical fill form seals and horizontal fill form seal packaging operations.…”

Section: Introductionmentioning

confidence: 99%

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The effect of heat sealing temperature on the properties of OPP/CPP heat seal. I. Mechanical properties

Tsujii¹,

Ishiaku²,

Mizoguchi³

et al. 2005

J of Applied Polymer Sci

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ABSTRACT:The effect of heat sealing temperature on the mechanical properties and morphology of OPP/CPP laminate films was investigated. The laminated films were placed in an impulse type heat sealing machine with both CPP sides facing each other. The temperatures investigated ranged from 100 to 250°C. T-peel and tensile tests in combination with SEM were used to characterize the heat seals. A minimum seal initiation temperature of 120°C was identified for OPP/CPP laminate heat sealing. Peel strength increased sharply from zero at 110°C to maximum at 120°C, after which a gradual decrease was observed. Tensile strength initially increased until 120°C, after which it gradually decreased until 170°C and assumed a constant value beyond that. The initial rise has been associated to cold crystallization, while the reduction between 120°C and 170°C was due to relaxation in molecular orientation. Beyond 170°C, all the orientation in the laminate has been lost so orientation effects are nullified. Morphological studies with SEM revealed that seals were partially formed at lower temperatures, while the laminates were totally fused together at high temperatures, with intermediate tempera-

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of heat sealing temperature on the properties of OPP/CPP heat seal. I. Mechanical properties

Tsujii¹,

Ishiaku²,

Mizoguchi³

et al. 2005

J of Applied Polymer Sci

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show abstract

“…Meka and Stehling [4] also reported that heat seal strength depends primarily on plated temperature and secondary on dwell time. In addition, Morris [9] has confirmed the inverse proportionality relation between platen temperature and dwell time, and has stated that they are influenced by film thickness according to heat transfer theorem. The study of heat seal strength beyond 1 sec dwell time is only of theoretical interest.…”

Section: Effect Of Platen Temperature and Dwell Timementioning

confidence: 99%

“…For instance, Stehling and Meka [5] reported that the T pi value correspond closely to the T mf for all the unsupported polyolefins films investigated in their study. Whilst, Morris [9] reported that the T pi of ionomer films begin after the T mf value. Hence, it can be deduced that laminate films using different sealant materials produces different T pi -T mf trends.…”

Section: Heat Sealing Curvementioning

confidence: 99%

Effect of bar sealing parameters on OPP/MCPP heat seal strength

Yuan¹,

Hassan²

2007

Express Polym. Lett.

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Abstract. The effect of bar sealing parameters on the heat seal strength of oriented polypropylene (OPP)/metallic cast polypropylene (MCPP) laminate film was investigated. Based on the results obtained from the parametric study, a bar sealing process window was developed. All points drop within the process window are combinations of platen temperature and dwell time that produce acceptable heat seal. Optimum combinations are indicated by the lower border of the window. The plateau initiation temperature, Tpi of OPP/MCPP laminate film used in the present study occurred before the final melting temperature, Tmf of the sealant material. The highest achievable heat seal strength was at the plateau region, and the corresponding failure modes were delaminating, tearing or combine failure modes (delaminating and tearing). Minimum pressure level of 1.25 bars is necessary to bring the laminate interface into intimate contact in order to effect sealing.

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“…In general, homopolymers require less contact time to achieve the maximum seal strength than polymers containing structurally different (heterogeneous) copolymers . The extent of chain penetration between polymer films during heat sealing can be characterized using a dimensionless parameter, as proposed by Morris . This parameter is directly related to the seal strength.…”

Section: Introductionmentioning

confidence: 99%

Effects of Liquid Contaminants on Heat Seal Strength of low‐density polyethylene Film

Mihindukulasuriya

Lim

2011

Packag Technol Sci

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Heat sealing is commonly applied for making form‐fill‐seal packages fabricated from thermoplastic films. One of the challenges frequently faced by the industry is inadvertent contamination of film–film interface by the product during filling, which can compromise package seal strength. In this study, the effects of dwell time (0.5–1.5 s), jaw pressure (28–1860 kPa), jaw configuration (narrow versus wide contact area) and jaw temperature (150°C–180°C) on the interface temperature and seal strength of a linear low‐density polyethylene (LLDPE) film were investigated. Three different film–film interface conditions were studied: (1) no contaminant; (2) with water contaminant; and (3) with vegetable oil contaminant. In the presence of liquid contaminant, jaw pressure played an important role in displacing the liquid from the seal area to form intact seals. Short dwell time (0.3 s) and low jaw temperature (150°C) was not favourable for forming intact seals in both water‐contaminated and vegetable oil‐contaminated films. The optimum jaw temperature and dwell time required to produce intact seals for oil contaminated films was 180°C and 0.3 s, respectively, whereas a combination of 165°C jaw temperature and 1 s dwell time was required to form intact seals for water‐contaminated films. Within the experimental conditions investigated, interface temperatures of 130°C–140°C resulted in the most optimum seal strength for both water‐contaminated and clean film specimens. Above 140°C, a weakening of seal strength was observed, presumably because of the change in melt flow characteristics and possible initiation of thermal degradation of the polymer. Copyright © 2011 John Wiley & Sons, Ltd.

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Predicting the Heat Seal Performance of Ionomer Films

Cited by 28 publications

References 4 publications

The effect of heat sealing temperature on the properties of OPP/CPP heat seal. I. Mechanical properties

The effect of heat sealing temperature on the properties of OPP/CPP heat seal. I. Mechanical properties

Effect of bar sealing parameters on OPP/MCPP heat seal strength

Effects of Liquid Contaminants on Heat Seal Strength of low‐density polyethylene Film

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