Heat sealing of LLDPE films: Heat transfer modeling with liquid presence at film–film interface

Mihindukulasuriya, Suramya D. F.; Lim, Loong‐Tak

doi:10.1016/j.jfoodeng.2012.12.027

Cited by 10 publications

(12 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was attributed to neglecting the endothermic heat of fusion of polymers in their model and thinning of the polymer films due to the squeeze-out of sealant during the heat sealing process. Mihindukulasuriya et al 20 also predicted the interface temperature in sealing of low density polyethylene (LDPE) films using COMSOL Multiphysics software. By determining the specific heat (C p ) of the polymer at different temperatures from differential scanning calorimetric (DSC) curves of LDPE films and using thermal contact resistance (TRC) as a fitting parameter obtained from interface temperature measurements, their model showed a good agreement with experimental results for both clean and contaminated surfaces.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Heat Transfer in Heat Sealing of Multilayer Polymeric Films: Effect of Process Parameters and Material Properties

Aghkand

Dil

Ajji

et al. 2018

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

In this study, heat transfer in a heat sealing process was simulated using COMSOL Multiphysics software. Variations of thermal conductivity, specific heat, and density of polymers with temperature were measured in a wide temperature range. The temperature profile at the interface between two sealing films was measured using a fine thermocouple. Comparing experimental and simulation results indicated the high accuracy of the simulation and the significant role of considering thermal contact resistance as the boundary condition between the jaws and films. These results showed that the present simulation, for the first time, can successfully predict heat transfer and interface temperature in a heat sealing process without any fitting parameter. Moreover, the obtained results showed that the simulation can predict the effect of jaw temperature, sealing time, film thickness, and polymer crystallinity in a wide range of temperatures from below melting point to much higher temperatures than the melting point of the sealant.

show abstract

Section: Introductionmentioning

confidence: 99%

Simulation of Heat Transfer in Heat Sealing of Multilayer Polymeric Films: Effect of Process Parameters and Material Properties

Aghkand

Dil

Ajji

et al. 2018

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…The wide range of properties expected from plastic films such as barrier, sealing, optical, and mechanical properties, as well as reducing final price of the package have been the main motivations for producing multicomponent films in plastic packaging industry 1 . Considering the previous studies in the literature on this subject, multicomponent sealants can be categorized as (a) single layer films composed of a multicomponent polymer blend, 2–5 (b) multilayer films with a single polymer in each layer, 6–9 and (c) multilayer films with a mixture of different polymers in some or all layers 10–13 …”

Section: Introductionmentioning

confidence: 99%

“…In the case of multilayer sealants, despite some previous works on multilayer sealants, 6–13,22 only Viganò 23 examined the effect of back‐layer material on seal properties of multilayer sealant films. He studied blends of conventional polyethylene with metallocene linear low‐density polyethylene (mLLDPE) in 3‐layer co‐extruded polyethylene sealant films.…”

Section: Introductionmentioning

confidence: 99%

Effect of Back‐layer on seal performance of multilayer polyethylene‐based sealant films

Aghkand

Saffar

Ajji

2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

This work studies effects of back‐layer materials, thickness of sealant layer, and sealing condition on seal performance of multilayer polyethylene‐based films. Multilayer films with back‐layers of high‐density polyethylene (HDPE), or low‐density polyethylene (LDPE), or linear low‐density polyethylene (LLDPE) were produced with different thicknesses of the metallocene layer. It was found that increasing the thickness of the metallocene layer improved hot tack properties. In addition, films with back‐layers of LLDPE or LDPE showed higher hot tack strength compared to those with HDPE back‐layer. Increasing sealing temperature reduced significantly the hot tack strength and its dependency on metallocene layer thickness. It was found that increasing delay time after sealing, before peeling test, increased hot tack strength, but the rate of hot tack evolution and the type of peeling behavior were considerably affected by the type of back‐layer material. The effect of dwell time was also examined, and it was observed that increasing dwell time in the studied range did not affect the hot tack evolution. The mechanisms involved in the development of hot tack evolution were discussed, and it was shown that the back‐layer effects can be explained by bulk viscoelastic energy dissipation theory.

show abstract

“…5 Many researchers in this field conducted heat analyses using thin laminate films. Mihindukulasuriya and Lim 6 analytically investigated heat transfer modeling of film-film interfaces. Heat transfer models were developed to elucidate the heat transfer behavior that occurs during heat sealing of two layers of linear low-density polyethylene films.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analysis of heat sealing of multi-layered laminate films used in lithium polymer battery packaging

Jang

Ahn

2016

Journal of Plastic Film & Sheeting

View full text Add to dashboard Cite

The packaging of a lithium polymer secondary battery involves a wrapping process of an aluminum/polymer laminate film that uses heat sealing. Heat sealing time and sealing block width are important variables in creating packaging requirements for optimal battery performance and safety. In this study, a heat transfer analysis is performed using finite element method to investigate the temperature distribution of the sealing block over the course of the heat sealing process. Heat sealing time and sealing block width were the variables of interest for the heat transfer simulation in order to identify optimal manufacturing conditions. Through the analysis, we successfully identified a minimum heat sealing time less than 3 s and 1.5 mm width of the sealing block that optimizes both the rate of battery production and lithium polymer battery capacity. To validate the quality of heat sealing properties, visual inspection and restrained packaging tests were performed.

show abstract

Heat sealing of LLDPE films: Heat transfer modeling with liquid presence at film–film interface

Cited by 10 publications

References 31 publications

Simulation of Heat Transfer in Heat Sealing of Multilayer Polymeric Films: Effect of Process Parameters and Material Properties

Simulation of Heat Transfer in Heat Sealing of Multilayer Polymeric Films: Effect of Process Parameters and Material Properties

Effect of Back‐layer on seal performance of multilayer polyethylene‐based sealant films

Numerical and experimental analysis of heat sealing of multi-layered laminate films used in lithium polymer battery packaging

Contact Info

Product

Resources

About