| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Van Drongelen, Martin
University of Twente
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2024Investigating the influence of additive polymer molecular weights on the mechanical performance of recycled thermoplastic composites
- 2023Estimating minimum required dwell time for the heat sealing of talc containing polypropylene/low‐density polyethylene packaging filmscitations
- 2022Process- and material-induced heterogeneities in recycled thermoplastic compositescitations
- 2022An experimentally validated model for quiescent multiphase primary and secondary crystallization phenomena in PP with low content of ethylene comonomercitations
- 2022Modelling of Recycled Fibre-Reinforced Polymer Composites
- 2022Influence of electron-beam irradiation on plasticity-controlled and crack-growth-controlled failure in high-density polyethylenecitations
- 2021Long-term failure of transversely loaded glass/iPPcitations
- 2021Deformation and failure kinetics of polyvinylidene fluoride: Influence of crystallinitycitations
- 2021On the temperature evolution during continuous laser-assisted tape winding of multiple C/PEEK layerscitations
- 2021Influence of the Polymer Interphase Structure on the Interaction between Metal and Semicrystalline Thermoplasticscitations
- 2021Formation of Flat-on Lamellar Crystals in Absence of Nanoconfinementcitations
- 2020Non-uniform crystallinity and temperature distribution during adjacent laser-assisted tape winding process of carbon/PA12 pipescitations
- 2020A new global kinematic-optical-thermal process model for laser-assisted tape winding with an application to helical-wound pressure vesselcitations
- 2020The influence of physical ageing on the in-plane shear creep compliance of 5HS C/PPScitations
- 2020Effect of shear rate and pressure on the crystallization of PP nanocomposites and PP/PET polymer blend nanocompositescitations
- 2020Optimization of the laser-assisted tape winding process using an inverse kinematic-optical-thermal modelcitations
- 2019Impact of thermal processing or solvent casting upon crystallization of PLA nanocellulose and/or nanoclay compositescitations
- 2019Shredding and sieving thermoplastic composite scrapcitations
Places of action
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article
Estimating minimum required dwell time for the heat sealing of talc containing polypropylene/low‐density polyethylene packaging films
Abstract
Dwell time is one of the main parameters influencing heat seal quality and process efficiency in flexible packaging. In this study, the rheological behaviour of polypropylene (PP)/low-density polyethylene (PE-LD)-based compound films containing different ratios of talc was examined. The minimum dwell time required to supply a sufficient sealing was estimated based on heat conduction time and reptation time. Reptation is a rheological concept used to described the behaviour of a polymer melt, and the reptation time is the time required for a molecule to escape from its surrounded entangled structure. The results showed that increased levels of talc are associated with elevated complex viscosities, storage and loss modulus as well as an increased seal strength. The estimated minimum required dwell time at the seal initiation temperature (SIT) dropped sharply with the initial introduction of 10 wt% talc. However, increasing the talc ratio to 30 wt% did not create any major change in the estimated time value. Also, observed T-peel strength values for 0.1 and 0.5 s dwell time at SIT confirmed the predicted minimum required dwell time values. On the other hand, when the seal temperature is increased to the higher end of the operation window, time estimations did not match with the observed seal strengths. Here, the melting already starts and the molecules diffuse up to a certain distance before the interface temperature reaches the desired level. Recalculation of the average diffusion distance by including this pre-melting situation can present a better approach for the temperatures above SIT. When the molecules diffused around halfway along the sealant thickness observed, seal strengths reached a sufficient level (2.5 N/25 mm) for both SIT and the highest end of the operation window. In conclusion, it has been revealed that knowing the reptation time and the required time for the heat conduction during the sealing process can help to predict the minimum required dwell time to achieve quality sealing, especially at low sealing temperatures. Additional surface characterizations also helped to elaborate on the influence of changing insoluble filler ratio on the seal initiation properties. It has been showed that the added talc increases the surface free energy and supplies easier wetting at the seal interface. Therefore, adding talc or a similar insoluble filler can help to make the heat sealing process more efficient.