Plastic and nonmetallic article shaping or treating: processes – Treatment of material by vibrating – jarring – or agitating... – Continuously formed or indefinite length article
Patent
1996-11-08
1998-09-29
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Treatment of material by vibrating, jarring, or agitating...
Continuously formed or indefinite length article
264165, 2641711, 26417219, 2641731, 26417311, 425110, 425115, 425130, B28B 1100
Patent
active
058142550
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a process and a device for the continuous production of fiber-reinforced molded bodies of hydraulically setting materials which are applied in at least one layer of predetermined width and thickness to a moving substrate from one or more dispensers and in which glass fibers serve as reinforcement.
2. Description to the Prior Art
DE 34 31 143 C2 describes a process for the production of molded bodies, e.g., slabs, of fiber-reinforced hydraulically setting materials in which the material is applied without fibers in a predetermined thickness to a substrate upon which fiber chips coming from a cutting mechanism are scattered in metered amounts on the surface of the material and are pressed into the material by a tool which acts along the entire working width, the material being compressed at the same time. A disadvantage consists in that there are only relatively small proportions of reinforcement material which, in addition, are in a statically unfavorable arrangement only in an external region of the slab.
Further, a process for the fabrication of molded bodies from fiber concrete in which fibers are sprayed, trickled or scattered on unset concrete and then rolled in or smoothed on is known from DE-AS 24 56 712. The fibers are continuously cut from a glass-fiber roving by a cutting mechanism. They can be applied in a plurality of layers, followed by a dusting of cement to absorb excess water. A concrete surface which is free of cracks and keeps out water better is supposed to be achieved by means of the fibers. The scattering and rolling in of the fibers is effected in a manual process with a cutting tool and a hand roller.
Apart from the unfavorable arrangement of the fiber layer, another disadvantage shared by the known process and devices consists in that they have only one "good side", namely the surface facing the shape-imparting substrates. In addition, the proportion of fibers in the concrete matrix is limited to approximately 5-6 percent by mass.
Further, processes are known in which hydraulically setting matrix material and separately conveyed glass fibers are sprayed on a substrate at the same time. In so doing, it is relatively difficult to adjust and maintain an exact mixture ratio of matrix to glass fibers. Further, a thickness sizing of the slabs produced in this way requires an additional process step with additional apparatus, and there is only one "good side".
Finally, it is known to apply to a substrate a uniformly thick layer of mixing material designated as "premix" which contains a homogeneous mixture of unset concrete and glass fibers. The working limits of "premix" are set by the proportion of glass fibers to be added because the workability of the mixture is impaired or destroyed with higher proportions and the reinforcement content for thin slabs is generally too small.
Slabs with different reinforcement are sometimes joined in their unset state after fabrication in order to obtain a slab of double thickness or to achieve two approximately good surfaces.
SUMMARY OF THE INVENTION
The slabs are then made into a "sandwich", requiring a delayed work step which substantially increases production costs.
The object of the present invention is to provide a process and a device for producing fiber-reinforced slabs of an exactly predetermined or small thickness, as appropriate, which slabs have two smooth or textured "good sides" if necessary and can be produced in high yields with controllable metering of proportions of reinforcement material, especially with higher reinforcement proportions and with exact positioning of the reinforcement in statically stressed zones of the slab layer. The slabs can be further processed into three-dimensional molded bodies immediately or subsequently while, however, in the unset state.
This object is met by the invention in a process of the type mentioned above in that in opposite directions in at least two separate layers from at least two dispensers, surface structures a
REFERENCES:
patent: 2405528 (1946-06-01), Skolnik
patent: 2422345 (1947-08-01), Easterberg et al.
patent: 4076880 (1978-02-01), Geschwender
patent: 4242407 (1980-12-01), Bijen
patent: 4344804 (1982-08-01), Bijen et al.
patent: 4655982 (1987-04-01), Meyer et al.
Cipriani Frank
Gerling-Joy Melanie
Joy Gerd
Weiser Wolfgang
Derrington James
Durapact Gesellschaft fur Glasfaserbetontechnologie mbH
Kueffner Friedrich
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