Multi-layer reinforcing laminate
AssigneesHenkel Kommanditgesellschaft auf Aktien, Dr. Ing. h.c.F. Porsche Aktiengesellschaft
InventorsKarl Wesch, Matthias Jaehnichen, Adriano Morozini De Lira, Juergen Durm, Dietger Frisch
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Abstract
Multi-layer laminates are provided which contain at least two binder layers and at least two textile-containing layers. One binder layer faces a substrate to be reinforced, with a second binder layer between two textile-containing layers wherein one of the textile-containing layers is interposed between the binder layers. The binder layer facing the substrate has an elasticity modulus when cured which is less than or the same as the elasticity modulus of the second binder layer. The laminates are suitable for reinforcing or stiffening planar substrates, especially thin-walled substrates such as motor vehicle body parts.
Claims20
A multilayer laminate for stiffening a flat substrate comprising at least two heat-curable binder layers and two layers of fiber-containing flat textile materials, wherein a first binder layer faces the substrate to be stiffened, a second binder layer is remote from the substrate to be stiffened, a first layer of a fiber-containing flat textile material is arranged between the first binder layer and the second binder layer, a second layer of a fiber-containing flat textile material is arranged on the second binder layer remote from the substrate to be stiffened, the first binder layer facing the substrate to be stiffened being adhesively joined to the substrate to be stiffened and having the same elasticity modulus as, or a lower elasticity modulus than, the second binder layer when cured.
A process for stiffening a thin, flat substrate, comprising the following process steps:
- (a) extruding a first binder layer, optionally onto a protective film;
- (b) applying a first textile layer;
- (c) extruding a second binder layer onto the first textile layer;
- (d) applying a second textile layer to the second binder layer to form a laminate;
- (e) optionally, rolling down the edges of at least one of the first binder or the second binder layer so that said binder layer is thicker in the middle than at the edges;
- (f) optionally, cutting or stamping the laminate to size;
- (g) applying the laminate to the substrate to be stiffened;
- and
- (h) curing the laminate on the substrate by heating them both to a temperature of 130° C. to 210° C.
Dependencies are inferred from the claim text.