摘要:
A method for molding a ceramic core includes introducing a slurry to a mold (604) and vibrating the mold (604). The slurry has: silica-containing particles; polymer fiber; and matrix precursor. The mold (604) has an outer tool (606) and a liner (608) held within the outer tool (606). The vibrating comprises operating a plurality of vibration transducers (630A, 632A, 634A, 636A) distributed along the mold (604).
摘要:
Verfahren der Herstellung von Bauteilen einer vorgegebenen Bauteilgeometrie, insbesondere für Betonbauwerke, bei dem man eine mit Fasern versehene noch umformbare mineralisch gebundene, insbesondere zementgebundene Masse erzeugt, diese Masse einen oder mehrere Umformvorgänge erfahren lässt und sie schließlich in einer den Erhalt der Bauteilgeometrie erlaubenden Struktur verfestigen lässt, wobei wenigstens ein Umformvorgang der Masse in einer durch deren Durchführung zwischen zwei gegenläufig rotierenden, eine Dickenabmessung der Masse verringernden Walzen bewirkten Längsstreckung der Masse liegt.
摘要:
A method of manufacturing unpainted through-coloured fibre cement sheets comprising the steps of: a) producing a plurality of through-coloured green sheets (54); b) applying an anti-sticking agent to an outer surface of each of the green sheets (54) in a uniform and controlled manner, e.g. with a spray nozzle (50); c) forming a stack of green sheets (54) with the anti-sticking agent on the outer surface of each sheet; d) putting the stack of green sheets (54) in an autoclave; e) waiting until the sheets (54) are cured to a desired level; and f) removing the sheets (54) from the autoclave. By applying the anti-sticking agent in a controlled and uniform manner on the outwards facing surface of the sheets (54), the efflorescence can be controlled in a uniform manner and the traditional step of sanding can be avoided. In this way, potential gloss differences are reduced.
摘要:
The present invention relates in particular to a process for manufacturing an impregnated fibrous assembly, the process comprising at least the following steps: - introducing a first suspension (10) comprising a first powder of solid particles into an internal volume (2) delimited by an inner face (1a) of a first fibrous texture (1) of hollow shape placed in a mould, an outer face (1b) of the first fibrous texture (1) being present facing a wall (3) of the mould, - impregnating, by action of the centrifugal force, the first fibrous texture (1) with the first suspension (10) by rotating the mould about itself, - positioning, after impregnation of the first texture (1) with the first suspension, a second fibrous texture on the inner face (1a) of the first fibrous texture (1) in order to obtain a fibrous assembly, - introducing a second suspension comprising a second powder of solid particles into the internal volume (2) after positioning the second fibrous texture, and - impregnating, by action of the centrifugal force, the second fibrous texture with the second suspension by rotating the mould about itself in order to obtain the impregnated fibrous assembly.
摘要:
A method for controlling the liquid level in the premixing unit (500) of a Hatschek machine (1000) comprising a sheet manufacturing machine (100), a cement slurry preparation mixer (200), a settling tank (300), a selectifier (400), and a premixing unit (500), wherein a level meter measures the liquid level in the premixing unit and generates a measurement signal, and wherein said measurement signal directly or indirectly controls a control valve (801), such that the amount of the portion of the water-loaded cement slurry of the sheet manufacturing machine (100) that is supplied to the selectifier (400), is controlled.