| 摘要 |
The invention relates to silage covers, comprising at least two layers, wherein an inner first layer facing the silo is a single- or multi-layer plastic film having an oxygen permeability according to DIN 53380-3 at 23°C and 50% relative humidity of no more than 500 cm3 / (m2 d bar) and having a water vapor permeability according to ISO 15106-3 at 23°C and 85% relative humidity of at least 5 g / (m2 d), comprising in at least one layer in total at least 50 wt.-% of one or more materials from the group consisting of polyamide, copolyamide, polyester, copolyester, polyethylene vinyl alcohol, polyvinyl alcohol and mixtures thereof, and further comprising at least one second layer, which is located above the inner layer and is separated or can be easily separated from the inner layer or which separates itself on the silo, at least 70 wt.-% of which consists of materials from the group consisting of polyethylene, polypropylene, copolymers made of ethylene and other vinyl monomers, and copolymers made of propylene and other vinyl monomers. |
