Paper making and fiber liberation – Apparatus – Foraminous forming mold for discrete articles
Patent
1990-09-05
1992-11-03
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Foraminous forming mold for discrete articles
162225, 162399, 425371, B28B 152, B28B 502
Patent
active
051604116
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an installation for the production of sheet-like members from a mixture of plaster and fibrous materials with
a) a device, which prepares the raw materials, doses them and mixes them in a dry state in a desired ratio;
b) a device, which controls the dry mixture and supplies and mixes in an accurately dosed quantity of water;
c) a spreading device, which spreads the moist mixture on a forming line, which comprises a continuously rotating, endless forming belt;
d) a continuously operating belt press, through which the moist mat of material spread out on the forming line is guided for compaction to produce a shaped member and which in turn comprises two movable press plates spaced apart, around which an endless steel belt respectively rotates at the speed of the forming line;
e) a cutting device located at the end of the forming line, which cuts the continuous shaped member into individual sheets;
f) a setting station, in which the plaster in the sheets sets;
g) a drying station, in which moisture is removed from the plates which have set.
An installation of this type has become known due to public prior use. Its section, which deals with the preparation, dry and moist mixing as well as the spreading on the forming line, is also described in EP-OS 153 588. The compaction of the mat of spread-out material in the belt press in this case takes place so that the steel belt associated with the lower press plate bears from below against the forming belt, whereas the steel belt associated with the upper press plate -- protected by a synthetic belt -- engages on the upper surface of the mat of spread-out material. However, this known installation has several drawbacks: primarily it is troublesome that neither of the two sides of the finished shaped sheets is suitable as a visible side for all applications without subsequent treatment. Due to patchy spreading-out or flushing-out of plaster, which emanates from spraying with water in the spreading machine, the surface pointing upwards in the belt press may become uneven and rough; the lower side which is smooth per se and bears against the forming belt in the belt press is scratched and marked in the subsequent setting and drying stations, especially in acceleration sections, and is therefore likewise not suitable as a visible side. A second, more important drawback of the known installation is to be seen in that the working speed has limits; if the belt press operates too quickly, due to the air which is forced out, part of the spread-out mat is blown away; also, breaking-open of the spread out mat is possible.
It is the object of the present invention to develop an installation of the aforementioned type so that on the one hand higher operating capacities can be achieved and that on the other hand the sheets produced have a visible side, which requires no subsequent work.
This object is achieved according to the invention due to the fact that
h) at least one endless-belt screen is guided around the upper belt plate of the belt press, which endless-belt screen is located between the upper surface of the spread-out mat and the steel belt associated with the upper press plate;
i) located between the cutting device and the drying station is at least one turning device, in which the individual sheets are rotated through 180.degree. so that the previously upper surface, which was provided with markings by the endless-belt screen, is directed downwards and the previously lower, smooth surface is directed upwards.
Thus, according to the invention, a continuously revolving belt screen is used on the upper, anyhow not always smooth side of the spread-out mat in the belt press, which belt screen indeed leaves its markings on this surface, but at the same time allows a better removal of air and thus higher operating speeds. The smooth side of the spread-out sheet, resting on the forming belt and pointing downwards in the belt press is intended as the visible side. In order that the latter is not damaged in the following stations, as in the known installa
REFERENCES:
patent: 1597990 (1926-08-01), Makowski
patent: 1676318 (1928-07-01), Birdsey
patent: 3600274 (1971-08-01), Trickett et al.
patent: 3682770 (1972-08-01), Varrati
patent: 3737265 (1973-06-01), Schafer et al.
Babock-Bsh AG
Hastings Karen M.
Philpitt Fred
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