Materials | technology THERMOFORMING


HDPE ideal for shallow


drawing Total Petrochemicals has developed a high density polyethylene (HDPE) grade for sheet thermoforming. The grade, called 9825E,


is well suited for shallow- draw thermoformed packaging applications in the foodservice and food packaging industries that require high rigidity and toughness, says Total. The material delivers the


stiffness needed in these applications. The increase in stiffness opens up light- weighting opportunities, while maintaining perfor- mance – or to make a product of equivalent weight, but with improved performance. Other benefits of 9825E include impact strength, chemical resist- ance and low water vapour transmission rate. “Not only does 9825E


provide improved rigidity and processability compared to other grades of HDPE used in thermoformed containers, it offers increased gloss for improved aesthetics,” said Ted Harris, marketing manager for Total’s polymers division in the Americas. “Additionally, it satisfies a growing demand for materials that are widely accepted in recycling programmes.” Applications well suited


for the use of 9825E include drinking cups, bowls, portion cups and yogurt containers. ❙ www.total.com


www.filmandsheet.com ETFE


Fluoropolymer extends life of railway station roof in London


Dyneon’s ETFE film has been used in the construction of the new roof of Tottenham Hale railway station in London. The steel roof includes six


large umbrellas, and these are covered with transparent ETFE film. Two rows of umbrellas use around 860 sq m of the film. The films were made from 3M Dyneon’s ETFE material by Nowofol of Germany. Its Nowoflon ET 6235Z films have thicknesses of 80-400 microns. Vector Foiltec then stretched single-layer ETFE film between the struts of the structure. Tensioning wires support the film webs, which are welded to one another. As well as being highly


POLYAMIDE


Polyamide grades adapted for use in film extrusion applications


Radici of Italy has developed a family of its Radilon polyamides for extrusion applications. Radilon materials are already used in a number of high temperature and metal replacement applications. It has now adapted a range of PA610/66


copolymers, for use in packaging, films and wraps for the food industry – where transpar- ency, thermoformability and water vapour barrier properties are required. “By introducing this new range, we aim to


implement a diversification process in the market,” said Enrico Simonato, extrusion market manager at Radici. Until now, most extrusion product demand has been met by PA11 and 12, thanks to their good chemical resistance, low level of rigidity, translucency and low moisture absorption.


However, they are quite costly, says the company.


It says that its range of LCPA-based materi- als has a good cost/performance ratio while maintaining high chemical resistance, low moisture absorption, good mechanical proper- ties and better thermal properties (higher melting point). “The latter feature is crucial when the final


products need to be used under hot conditions or in contact with hot parts,” according to the company.


Radici has also adapted the materials for


other extrusion applications. It has developed a grade of PA612 for the manufacture of chemi- cally resistant pipe, and of PA610 for fuel line pipes. ❙ www.radicigroup.com


April 2017 | FILM & SHEET EXTRUSION 47


transparent – transmitting more than 95% of light – the films are highly chemically resistant, and very smooth – meaning that rainwater will wash off almost all dirt on the surface. As well as having high


tensile strength, tear propaga-


tion resistance and puncture resistance, the films can withstand impact loads – such as from hail stones, and snow loads. They also meet the requirements for fire protection with fire class B1 (according to DIN 4102). ❙ www.dyneon.com


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