Hoechst Aktiengesellschaft

Wolfgang Greiser

Hans Wagner

Karl-Christian Zerfass

Kurt Plotz

A laminate which, when used as a carrier web for roofing and sealing sheets, shows good flammability properties combined with improved mechanical properties and which comprises a layer of synthetic fibers and a layer of mineral fibers is obtained by needling two preconsolidated fiber webs, of which one comprises synthetic fibers and the other mineral fibers. The needling produces a strong positive join of the two webs, as a result of which the tendency for the two layers to delaminate under extreme thermomechanical conditions is avoided.

Laminate

Laminates, which are composed of a preconsolidated synthetic fiber web and a preconsolidated mineral fiber web, which are bonded to each other by needling, are improved in respect of their dimensional stability, in particular in the transverse direction, when the preconsolidated mineral fiber wet contains reinforcing yarns of a mineral material and extending in the longitudinal direction. They are preferably used as carrier web for roofing and sealing webs.

An apparatus for producing a spunbond by pneumatic take-off and laying of melt-spun filaments comprises a superatmospheric pressure chamber which is connected to the melt spinneret in a gas-tight manner and has discharge orifices for the filaments. Said superatmospheric pressure chamber tapers weekly conically into a drawing cell. The aperture angle of the weakly conical superatmospheric pressure chamber is less than 7.degree.. The filaments are spun in the form of a linear curtain into the interior of the superatmospheric pressure chamber which is just as wide as the curtain. One side of the conical portion and of the drawing cell is moveable and, at the start of the melt spinning, can be moved away from the other wall, so that the start-up of spinning is facilitated.

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Neusass/Hainhofen, Germany

Wolfgang Greiser