Extrusion 7-2016

125

Extrusion 7/2016

aus 3M Dyneon ETFE extrudiert. Die NO-

WOFLON

ET 6235Z Folien gibt es in

Stärken zwischen 80 bis 400 Mikrome-

ter. Nowofol produziert die Folien trans-

parent, in nahezu allen RAL-Farbtönen

und seit kurzem auch als Infrarotstrahlen

absorbierende Ausführung. Die Folien er-

füllen die Brandklasse B1 (nach DIN

4102), nicht nur in den USA ein wichti-

ges Kriterium.

Ein besonderes Augenmerk legten die

Architekten und Dachplaner auf die

Tragfähigkeit hoher Schneelasten, denn

das Dach des nur halb so großen Vorgän-

gergebäudes, Metrodome, war im De-

zember 2010 unter einer mehr als 50 cm

dicken Schneeschicht zusammengebro-

chen. ETFE Folien bieten sehr gute Werte

bei der Reiß-, Weiterreiß- und Durch-

stoßfestigkeit. Ihr Einsatz in Nordeuropa

und den Alpen belegt die Wintertaug-

lichkeit auch bei hohen Schneemengen.

Die pneumatisch unterstützten Kissen fe-

dern stoßartige Lasten ab.

Das asymmetrische Dach ist nach Norden

stärker geneigt, um den Schnee abzulei-

ten. Die Folien sind aufgrund ihrer anti-

adhäsiven Oberfläche so glatt, dass

Schnee kaum Halt findet und nahezu

kontrolliert abrutschen kann. Für ihre

Reinigung reicht weitestgehend ein kräf-

tiger Regenschauer.

3M Deutschland GmbH

www.mmm.com

utside temperatures of minus 30 de-

grees are usual during the American

Football season from September to the

beginning of February. Therefore, only

closed stadiums are the only choice in

the north of the USA. In order to create a

genuine open-air atmosphere at least in

summer, architects have often made use

of movable, but expensive roofs in the

past. The ETFE film cushion technology,

which is already widespread in Europe

and Asia, was used for the first time in

the US by the HKS Architects for the

construction of the new multi-purpose

stadium in Minneapolis, thus lowering

the construction costs by around USD

100 million as compared to a retractable

roof.

Round about 75 three-layer ETFE film

cushions cover the total roof and facade

area of 22,000 square metres. The U.S.

Bank Stadium is thus the largest ETFE

film project in the US. Some of the indivi-

dually air filled cushions are more than

110 m long and around 3 m wide. The

top film is printed with a geometric pat-

tern, which scatters the sunlight and pre-

vents a greenhouse effect in summer. In

winter, the film roof protects the interior

from the cold outside temperatures.

The film cushions manufactured from

3M Dyneon ETFE allow 95 percent of the

daylight to pass through, but their

weight is only about five percent that of

glass. As a result, the supporting steel

structure can be particularly light and

slender and offers all spectators an opti-

mum view of the playing field.

The entrance consists of five giant glass

doors, which are over 30 m in height and

remain open in summer. Vector Foiltec

built the film construction that joins onto

them. With 14 offices worldwide, Vector

Foiltec covers the entire spectrum from

the conception to the support structure

planning and from the manufacturing of

the cushions to their installation. The

films are extruded from 3M Dyneon ETFE

by Nowofol Kunststoffprodukte GmbH &

Co. KG, NOWOFLON

ET 6235Z films

are available in thicknesses from 80 to

400 microns. Nowofol produces the

films in a wide range of RAL colours as

well as in transparent and, completely

new, in an infrared absorbing variant.

The films conform to fire protection class

B1 (according to DIN 4102), which is an

important criterion – not just in the USA.

The architects and the roof planners paid

particular attention to the load bearing

capability under high snow loads, be-

cause the roof of the Metrodome, the

predecessor building that was only half

as large, collapsed in December 2010

under the heavy load of more than half a

meter of snow. ETFE films feature very

good values for tear strength, resistance

to tear propagation and puncture resis-

tance which let the air filed cushions ea-

sily cope with highly concentrated im-

pact loads like hail. Their use in northern

Europe and the Alps proves their winter

compatibility, even in areas with heavy

snowfall.

The asymmetric roof is inclined more to-

wards the north in order to fend the

snow off. Due to their anti-adhesive sur-

face, the films are so smooth that snow

can hardly get a grip at all and slides

off – in an almost controlled manner. A

heavy rain shower is enough to clean it.

Das US Bank Stadium verfügt über eine transparente Dachkonstruktion mit

Hochleistungsfolien extrudiert aus 3M Dyneon Fluoroplastic ETFE

The US Bank stadium is featuring a transparent roof construction with high-

performance films extruded from 3M Dyneon Fluoroplastic ETFE

(Copyright Minnesota Vikings)

Hall 5,

Stand B10