Textiles: fiber preparation – Assembling – Web forming
Patent
1988-10-20
1992-05-12
Ball, Michael W.
Textiles: fiber preparation
Assembling
Web forming
191611, 65 44, 156 624, 156 628, 156264, 156512, 156556, 425 831, D01G 2500
Patent
active
051115522
DESCRIPTION:
BRIEF SUMMARY
Mineral wood is a product having innumerable fields of application, of which the main field is the use as insulating material for heat and sound insulation.
Originally, mineral wood products consisted of an unorganized bundle of fibres, however, during the last 40 years they have been imparted a more or less solid shape by introducing a binding agent inbetween the fibres and by curing the composition, most frequently in the form of a mat which subsequently is sawn to the desired dimensions.
The preparation of mineral wood products is carried out by melting mineral raw materials in a furnace, such as an electric furnace or a cupola furnace. The melt is allowed to flow continuously out of the furnace to a fibration assembly, usually consisting of a range of rapidly rotating cylinders, the melt flowing against the mantle surfaces of these. As the melt strikes the rotating mantle surfaces, it adheres and gains an accelerating rate which finally leads to the melt being successively flung out under the effect of the centrifugal force, whereby droplets of the melt stretch out and form fibres. The fibres are primarily flung out in a plane normal to the axis of the fibration cylinders. The fibre flow is deflected out of this plane by means of a directed flow of gas which guides the fibre flow towards a collecting member, which may consist of a perforated conveyor belt, a net conveyor, a perforated apron conveyor or one or several perforated drums. The fibres are deposited on the surface of the collection conveyor, while the gas flow is sucked into a suction box inside the perforated collecting surface.
In a conventional collecting process, the collection of fibres takes place in one step so that the desired grammage of fibres is obtained on the collection member. The adhesive has generally been introduced by spraying a binding solution on the deflected fibre flow whereafter the fibres comprising the binder agent are guided towards the collecting member. The web with the desired grammage is subsequently lead to a tempering furnace in which the product gets the proper width and thickness, and the binder is fixed. This is followed by cooling, formatting, possible surface treatment and packing.
Achieving a product which is as regular and homogenous as possible is an important aim of the process. The regularity and homogeneity influence the insulating capacity. Another aim is to obtain a product, in which the fibres are oriented in the product plane. This gives an elastic product which can be compressed for the packing and transport step.
In order to achieve this, a relatively thin primary web is collected on the collecting surface, the grammage of which ranges from 100 to 450 g/m.sup.2. Thus, the fibres get a regular and satisfactory orientation and the binder is equally distributed in the web. In order to maintain the capacity on the desired level while having a thin primary web, the rate of production of the primary web has to be high, like the rate of subsequent devices.
In known processes used up till now, the primary web is transformed by a folding process into a final web comprising zigzag folds. The folding may be performed in one or several steps and results in a final web having from 6 to 20 layers. The primary web may also be doubled before the folding. According to another known process, primary webs from several collecting members are superposed and folded simultaneously.
According to all the proceedings used until today, the primary webs obtained have always been handled as continuous coherent mats, which have been superposed by doubling, folding and/or laminating.
When folding the primary web, reversible conveyors have usually been used, feeding the primary web down between two pendulum elements, while the conveyor output ends move to and fro at a rate essentially equal to the feeding rate of the primary web, in order to avoid folding or stretching of the mat in the output step. The reversible movement has most frequently been realized by disposing the end positions of the pendulum strike highest above th
REFERENCES:
patent: 2425660 (1947-08-01), Ware et al.
patent: 2503067 (1950-04-01), Powell
patent: 2758630 (1956-08-01), Hodge
patent: 2889583 (1959-06-01), Wacker et al.
patent: 3050200 (1962-08-01), Siempelkamp
patent: 3104191 (1963-09-01), Hicks et al.
patent: 3332819 (1967-07-01), Siempelkamp
patent: 4201247 (1980-05-01), Shannon
patent: 5030312 (1991-07-01), Williams et al.
Lauren Henning J. E.
Moisala Tapio O.
Nurmi Tom E. E.
Ball Michael W.
Maki Steven D.
Oy Partek Ab
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