US 11,673,308 B2
WPC extrusion profile and apparatus and method for manufacturing the same
Leopold Weiermayer, Wartberg/Krems (AT); and Franz Zorn, Wartberg/Krems (AT)
Assigned to GREINER EXTRUSION GROUP GMBH, Nussbach (AT)
Appl. No. 16/966,890
Filed by GREINER EXTRUSION GROUP GMBH, Nussbach (AT)
PCT Filed Feb. 1, 2019, PCT No. PCT/EP2019/052512
§ 371(c)(1), (2) Date Aug. 1, 2020,
PCT Pub. No. WO2019/149892, PCT Pub. Date Aug. 8, 2019.
Claims priority of application No. 10 2018 201 579.1 (DE), filed on Feb. 1, 2018.
Prior Publication US 2021/0046688 A1, Feb. 18, 2021
Int. Cl. B29C 48/09 (2019.01); B29C 48/00 (2019.01); B29C 48/285 (2019.01); B29C 44/34 (2006.01); B29K 23/00 (2006.01)
CPC B29C 48/09 (2019.02) [B29C 48/0012 (2019.02); B29C 44/355 (2013.01); B29C 48/2886 (2019.02); B29C 2948/92704 (2019.02); B29K 2023/06 (2013.01); B29K 2023/12 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A WPC extrusion profile comprising:
a WPC material in which plant fibers are embedded in a plastic matrix, wherein:
the WPC material has a content of naturally growing plant fibers of between 30 and 75 wt-%
the WPC extrusion profile includes at least one hollow chamber,
the at least one hollow chamber of the WPC extrusion profile is completely filled up with a foam, in particular a closed-pore foam
the foam consists of a plastic material of the same type of plastic as the matrix of the WPC material,
foaming takes place with a physically acting blowing agent, in particular CO2,
the density of the foam is less than 0.4 g/cm3, and
the average cell size of the foam has a mean diameter of less than 0.4 mm.