Multi-Layer Facade Film
OwnerBernd Kronenberginventor
Life of this patent
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Abstract
A multi-layer façade film having a fleece layer and two plastic film layers, the fleece layer being sandwiched between the plastic film layers and bonded thereto. Each layer is elastically extensible in all directions. The fleece is made of a thermoplastic elastomer in a melt-blown process. Each film layer includes an elastically deformable thermoplastic urethane and is connected to the fleece as an extrusion coating. The façade film has a yield strength of at least 40% in the length and width directions of the film. A 50 mm wide film strip has a tensile strength of at least 120 N, a maximum Sd value of 1.5 m for vapor permeability, and a value corresponding to a water column of at least 8 m for water impermeability.
Claims12
A multi-layer façade film having a length dimension and a width dimension, the multi-layer façade film comprising:
- two film layers, each film layer formed of a plastic film;
- and
- a fleece layer, the two film layers bonded to each side of the fleece layer as an extrusion coating;
- wherein the fleece layer is made of a thermoplastic polymer in a melt-blown process and is all-directionally elastically stretchable;
- wherein each film layer is also all-directionally elastically stretchable and contains an elastically deformable thermoplastic urethane (TPU);
- and wherein the multi-layer façade film has an elastic strength of at least 40% in the length direction and the width direction, a yield strength, measured on a 50 mm wide film strip, of at least 120 N, a vapor permeability having an Sd value of at most 1.5 m, and a water impermeability value that corresponds to a water column of at least 8 m.
Dependencies are inferred from the claim text.