Abstract: A network layer is provided that contains at least one thermoplastic biodegradable substance. The network layer contains at least one colored first material in a first direction, the first colored material exhibiting a first absorption coefficient, and at least one colored second material in a second direction, the second colored material exhibiting a second absorption coefficient. The colored first material and the colored second material are in contact with each other, a coloration of the first material is different from a coloration of the second material, and the second absorption coefficient is different from the first absorption coefficient.

Abstract: A network layer is provided. The network layer (3) comprising at least one thermoplastic biodegradable substance, whereby the network layer (3) exhibits at least one coloured first material (1) in a first direction (4) and at least one coloured second material (2) in a second direction (5), whereby the coloured first material (1) and the coloured second (2) material are in contact with each other and whereby the colouration of the first material and the colouration of the second material is different, characterized in that the first material exhibits a first absorption coefficient and the second material exhibits a second absorption coefficient, being different from the first absorption coefficient.

Abstract: A screening installation is provided that detects a fire in a greenhouse. The screening installation has at least one screening fabric with an upper side and a rear side, and a first set of polymeric or metallic wires arranged proximate to the upper side of the at least one screening fabric so that a displacement of the fabric is restricted by the first set of polymeric or metallic wires. In addition, at least on of the polymeric or metallic wires in the first set of polymeric or metallic wires is replaced by a linear heat detection wire and/or the first set of polymeric or metallic wires is supplemented with at least one linear heat detection wire.