Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

DuPont at Interpack 2014: New perforation resistant thermo-formable film can save up to 20% in packaging weight

20.05.2014

In the context of their extensive collaboration to improve the efficiency, performance and sustainability of packaging applications, Reifenhäuser Kiefel Extrusion of Troisdorf/Germany and DuPont have developed a material and cost saving medium barrier 9-layer film for thermoforming applications.

Key to a weight reduction of up to 20% and improved packaging performance over incumbent 7-layer PA/PE structures are Reifenhäuser’s versatile 11/9-channel EVOLUTION barrier blown film technology and a new high stiffness DuPont™ Surlyn® ionomer sealant resin, which allows for sealing at lower temperatures and provides a broad operating window.


Photo: DuPont

Thanks to the use of a high stiffness Surlyn® ionomer sealing layer, a newly developed 9-layer-film for thermoformed packaging provides the same stability as a currently used PA-PE-7-layer film weighing 20% more. This generates significant cost savings for converters plus further advantages including higher gloss and transparency as well as higher perforation resistance, needed for hard edges of vacuum-packed food.

Further advantages include superior perforation and abrasion resistance as well as an improved fat barrier, making the new film a first choice for vacuum packs containing hard and sharp products, such as mature cheese or meat with bones or smoked ham.

Substantial cost savings support short break-even time

Thanks to the high stiffness of the Surlyn® sealant layer, film thickness can be downgauged by 20% with no loss in stiffness. Whilst common 7-layer film structures for thermoforming applications have typical thicknesses of around 240 µm, the thickness of the new 9-layer film is just 200 µm. In spite of this significant reduction, the new film feels just as robust as current structures. And because of its higher gloss and transparency, shelf appeal of the packed products is increased. 

Beyond downgauging, the material costs for new PA/Surlyn® structure are around 10% lower compared to 7-layer PA/PE structures. A further financial benefit results from a reduction of up to 20% in ecotax due to the reduced packaging weight. And thanks to the outstanding seal performance of Surlyn® even through liquid or powder contamination, the number of rejects along the entire distribution chain is reduced significantly.

Summing up these savings, the additional investment for a 9-layer blown film line will pay back in the short term, because the cost for a system including 9 extruders and blending units as well as a bigger die head are just 10 to 15% higher than those for a 7-layer line. Taking into account just the resin related cost savings of 10%, the payback time for these additional costs will be less than six months. This can be further accelerated, if higher sales prices for the superior films can be achieved.

Improved optical, processing and application performance

At the DuPont and Reifenhäuser labs, major optical, processing and application characteristics of the new 9-layer structure, produced with Reifenhäuser’s EVOLUTION barrier blown film line, and with Surlyn® on the internal surface, were compared to a standard 7-layer structure with a PE sealing layer, both combined with a PA layer.

In these tests, the new 9-layer structure provided a gloss gain of 10% and a 13% higher transparency over the incumbent structure, and also exhibited improved thermoforming performance. Due to the special stress-strain behaviour of the Surlyn® sealant’s specific chemical structure with ionic crosslinking, the strength of the stretched areas of the film increases. Thanks to this so called 'strain hardening', film thickness in the bottom corners of the thermoformed packs is higher than for PE based sealants, which get weaker in stretched areas. Thus, despite the fact that the conventional 7-layer film was 20% thicker before thermoforming, both structures had identical film thicknesses in the corners after thermoforming.

A further advantage of using the new Surlyn® sealing layer with its cross-linked molecular structure becomes obvious under point loads, e.g. caused when edges of vacuum-packed hard cheese, dry meats or bacon constantly press against the film. Under such conditions soft polymers in the structure can be displaced, weakening the film and creating micro holes over time. This is especially true for polyethylene copolymers used for high performance sealing applications. In contrast, the much harder Surlyn® sealant polymers withstand such mechanisms, resulting in a 10% higher perforation resistance for the 9-layer PA/Surlyn® structure compared to the 20% thicker 7-layer PA/PE based film – even in the corners of the thermoformed pack, which are often prone to leakers.

Backed up by EVOLUTION

Cost-efficient production of the new multilayer thermo-formable 9-layer structure has been made possible thanks to the versatility and high precision of Reifenhäuser Kiefel’s EVOLUTION ULTRA RANGE extruders. Developed for easy processing of complex film structures with all kind of resins, they provide outstanding flexibility in terms of choice and amount of high performance polymers including high-barrier grades, adhesives and sealants, so allowing use of the most suitable materials at minimum costs. Depending on the required film structure, they permit both very high and very low output rates at low melt temperatures. The possibility of combining up to 11 channels enables the production of asymmetric films with minimum curling. Their advanced die head technology with precise individual melt distribution allows for extreme downgauging. The superior flatness of the film provides improved printability and constant performance over its entire area. 

Reifenhauser Kiefel Extrusion GmbH is member of the Reifenhauser group which consists of six business units and over 1,200 employees and is the largest extrusion network in the industry. The company is a leading German manufacturer of high quality blown film extrusion systems and peripheral equipment for the production of flexible films and has over 40 years of a successful history worldwide in the production of simple mono layer up to sophisticated 9-layer barrier film lines for a wide variety of applications.

DuPont Packaging & Industrial Polymers manufactures an extensive mix of adhesive, barrier, peelable lidding and sealant resins and provides a globally networked development team to work with customers on packaging programs that help protect the product, environment; improve shelf appeal, convenience; and reduce cost in the food, cosmetics, medical products and other consumer goods and industrial packaging industries.

DuPont (NYSE: DD) has been bringing world-class science and engineering to the global marketplace in the form of innovative products, materials, and services since 1802.  The company believes that by collaborating with customers, governments, NGOs, and thought leaders we can help find solutions to such global challenges as providing enough healthy food for people everywhere, decreasing dependence on fossil fuels, and protecting life and the environment.

For additional information about DuPont and its commitment to inclusive innovation, please visit www.dupont.com

EVOLUTION is filed as registered trademark of Reifenhäuser.
The DuPont Oval, DuPont™ and all products denoted with ® are registered trademarks or trademarks of E. I. du Pont de Nemours and Company or its affiliates.

PIP-Interpack-2014-02


Contact:
DuPont de Nemours International Sarl. 
Nilgun Turan
Marketing Communications Manager, Europe
Packaging & Industrial Polymers
Phone: +41-22-717-5497, Mobile: +90-530-5669883
Nilgun.Turan@dupont.com

Nilgun Turan | DuPont

Further reports about: DuPont Packaging Polymers Surlyn® cheese materials processing reduction savings sealants stiffness structure structures temperatures weight

More articles from Trade Fair News:

nachricht Heraeus Noblelight at the Drupa 2016
02.05.2016 | Heraeus Noblelight GmbH

nachricht Flexible robot systems for digitalized production
27.04.2016 | Fraunhofer-Institut für Produktionstechnik und Automatisierung IPA

All articles from Trade Fair News >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Nuclear Pores Captured on Film

Using an ultra fast-scanning atomic force microscope, a team of researchers from the University of Basel has filmed “living” nuclear pore complexes at work for the first time. Nuclear pores are molecular machines that control the traffic entering or exiting the cell nucleus. In their article published in Nature Nanotechnology, the researchers explain how the passage of unwanted molecules is prevented by rapidly moving molecular “tentacles” inside the pore.

Using high-speed AFM, Roderick Lim, Argovia Professor at the Biozentrum and the Swiss Nanoscience Institute of the University of Basel, has not only directly...

Im Focus: 2+1 is Not Always 3 - In the microworld unity is not always strength

If a person pushes a broken-down car alone, there is a certain effect. If another person helps, the result is the sum of their efforts. If two micro-particles are pushing another microparticle, however, the resulting effect may not necessarily be the sum their efforts. A recent study published in Nature Communications, measured this odd effect that scientists call “many body.”

In the microscopic world, where the modern miniaturized machines at the new frontiers of technology operate, as long as we are in the presence of two...

Im Focus: Tiny microbots that can clean up water

Researchers from the Max Planck Institute Stuttgart have developed self-propelled tiny ‘microbots’ that can remove lead or organic pollution from contaminated water.

Working with colleagues in Barcelona and Singapore, Samuel Sánchez’s group used graphene oxide to make their microscale motors, which are able to adsorb lead...

Im Focus: ORNL researchers discover new state of water molecule

Neutron scattering and computational modeling have revealed unique and unexpected behavior of water molecules under extreme confinement that is unmatched by any known gas, liquid or solid states.

In a paper published in Physical Review Letters, researchers at the Department of Energy's Oak Ridge National Laboratory describe a new tunneling state of...

Im Focus: Bionic Lightweight Design researchers of the Alfred Wegener Institute at Hannover Messe 2016

Honeycomb structures as the basic building block for industrial applications presented using holo pyramid

Researchers of the Alfred Wegener Institute (AWI) will introduce their latest developments in the field of bionic lightweight design at Hannover Messe from 25...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

The “AC21 International Forum 2016” is About to Begin

27.04.2016 | Event News

Soft switching combines efficiency and improved electro-magnetic compatibility

15.04.2016 | Event News

Grid-Supportive Buildings Give Boost to Renewable Energy Integration

12.04.2016 | Event News

 
Latest News

New fabrication and thermo-optical tuning of whispering gallery microlasers

04.05.2016 | Physics and Astronomy

Introducing the disposable laser

04.05.2016 | Physics and Astronomy

A new vortex identification method for 3-D complex flow

04.05.2016 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>