Production lines of waterproofing synthetic membranes FLAG SpA
PVC Co-extrusion – Line 1 Chignolo d’Isola (BG)
In this process the components mix of each single extruder (resins, plasticisers, stabilisers, pigments, etc) is introduced in a cylindrical chamber through a hopper. Here it is heated up and compressed by worm screws into a co-extrusion head, and afterwards it is laminated through a calendaring machine The thickness of the membrane is automatically adjusted by electronic control devices when the extrusion head and the calandaring machine open. The result is a single-layer homogeneous membrane without inner mesh, available in two-colour version with signal layer or coupled to thermo-treated geo-textile.
PVC Co-extrusion – Line 2 Chignolo d’Isola (BG)
In this case the extrusion of single layers of homogeneous material occurs directly on the surfaces of a meshing, to obtain reinforced membranes (polyester mesh reinforcement) or stabilised membranes (with glass mesh reinforcement).
PVC Co-extrusion – Line 3 Chignolo d’Isola (BG)
Flag Spa has designed an exclusive co-extrusion process on the two faces of the reinforcement also for polyolefin synthetic membranes (TPO) to obtain the full embedding of the mesh into the waterproofing membrane. The reinforcement can be composed by different inserts (glass veil or polyester mesh) according to the application purposes of the product.
All waterproof synthetic membranes of the FLAGON TPO range are available in two-colours signal-layer version; this guarantees the immediate detection of holes or tears on the membrane during the setting, thanks to the appearance of the underlying dark colour on the light visible side.
PVC-P spreading – Villa Santo Stefano (FR)
It is a production process where the mesh is full part of the synthetic waterproof membrane. A mixture of liquid-viscous product, called “plastisol” is laid on a support by a spreading head. This mixture contains resins, plasticizing agents, stabilizing agents and pigments, and defines the ultimate characteristics of the waterproofing membrane.
After the spreading phase, plastisol hardens due to a jellification process obtained inside the furnaces after an adequate temperature increase.
The spreading and jellification process is repeated four times on line introducing between the second and the third layer, exactly in the middle, a reinforcement of polyester mesh or glass veil mesh.
The membranes manufactured by spreading are composed by four different formulation layers with a molecular bond originating an homogeneous and flexible single layer membrane. The material can be coupled to a thermo-treated geo-textile layer to improve its anchoring characteristics (for visible covering glued with total adherence) or allow the setting on materials that are not chemically compatible with PVC-P. Spreading lets produce two-colour membranes with signal-layer.