US 3799252 A
Feeding device for applying the material to be treated onto the treatment cylinder of a roller drier, by means of a rotatable take-up cylinder immersed in a bath of the material, and a doctor plate extending downwardly and stripping the layer of said material from said take-up cylinder; a gap is left free between the lower end of said doctor plate and the treatment cylinder; said material flowing over said doctor plate and impinging on the peripheral surface of said treatment cylinder can flow away in a guided fashion through said gap.
Claims available in
Description (OCR text may contain errors)
United States Patent Soll Mar. 26, 1974 FEEDING DEVICE FOR A ROLLER DRIER 1,137,181 4/1915 Berg 165/91 x O THE LIKE 3,127,367 3/1964 Endres et al.... 3,266,558 8/l966 Griffon 99/199 X  Inventor: Wilhelm Soll, Pacellestrasse 20, v
7990 Friedrichshafen, Germany Primary Examiner Meyer perlin  Filed; Oct 21 1971 Assistant Examiner-Ronald C. Capossela Attorney, Agent, or Firm--Austin P. Dodge; Robert A. [211 App]. No.: 191,172 Ostmann  Foreign Application Priority Data ABSTRACT Nov. 10, 1970 Germany 2055222 Feeding device for pp y the material to be treated onto the treatment cylinder of a roller drier, by means  U.S. Cl 165/91, 34/85, 34/120 of a rotatable k p ylinder immersed in a bath of  Int. Cl. F28d 11/02 the material, n a doctor pl xtending downwardly  Field of S a h 34/85, 1 10, 120; 165/91; and stripping the layer of said material from said take- 99/199 R; 159/10 up cylinder; a gap is left free between the lower end of said doctor plate and the treatment cylinder; said ma-  References Ci d terial flowing over said doctor plate and impinging on UNITED STATES PATENTS the peripheral surface of said treatment cylinder can 2,118,438 5/1938 Lawrence et al. 165/91 x flow away m a gu'ded fashlon through 3,355,349 11/1967 Devlin 34/120 X 4 Claims, 1 Drawing Figure FEEDING DEVICE FOR A ROLLER DRIER OR THE LIKE BACKGROUND OF THE INVENTION In a known feeding device of this kind (German utility model 1 890 586) the material flowing downwardly on the doctor plate is subjected, at the lower end of the doctor plate, to the action of air jets. The spray cones produced when this happens impinge on the peripheral surface of the treatment cylinder which is travelling upwards at the time.
It is also known to use a take-up cylinder taking the material from a bath at the time as an application cylinder, i.e., to arrange the take-up or application cylinder so near to the treatment cylinder that the layer of material lying on the take-up or application cylinder contacts, at its surface remote from the take-up or application cylinder, the treatment cylinder and is transferred thereto.
The two known apparatus can only provide a very thin layer of material on the treatment cylinder.
SUMMARY OF THE INVENTION The object of the invention is to apply a substantially thicker layer of material in a single operation.
According to this invention said object is achieved in said feeding device by taking the lower end of said doctor plate so far towards the peripheral surface of said treatment cylinder directed upwardly at the time, as to leave a gap free; said material flowing over said doctor plate and impinging on the peripheral surface of said treatment cylinder passing away in a guided manner through said gap.
In this way it is possible without difficulty to achieve a very thick layer of material on the treatment cylinder. The take-up cylinder must simply be made to run at an appropriate speed and the gap between the doctor plate and the treatment cylinder has to be made appropriately large.
BRIEF DESCRIPTION OF THE DRAWING One constructional example of the invention will be described in detail hereinafter with reference to the drawing. The single FIGURE shows a cross-section through a roller-type cooling apparatus in a simplified representation.
DESCRIPTION OF THE PREFERRED EMBODIMENT The illustrated roller-type cooling apparatus comprises a feeding device 1 for the material 2 which is to be treated e.g. cooled. The material forms in a dish 3 a bath in which there is immersed a take-up cylinder 4 of the feeding device. The feeding device 1 also comprises a doctor plate 5 which extends downwardly and strips the layer of said material from the take-up cylinder 4.
According to the invention the lower end of the doctor plate 5 extends towards the upper peripheral surface 6 of the treatment cylinder 7 so as to leave a gap 8 free. Thus the material flowing over the doctor plate 5 and impinging on the peripheral surface 6 of the treatment cylinder 7 passes in a guided manner through the gap 8.
The doctor plate 5 is adjustable relatively to the treatment cylinder 7 in order to adjust the size of the gap 8. For this purpose it can be pivoted for example about the axis of the take-up cylinder 4, the angle between the peripheral surface of the take-up cylinder 4 and the doctor plate 5 being kept at the same value. However, it is also possible to move the take-up cylinder 4 together with the doctor plate 5. As a result the angle between the peripheral surface 6 of the treatment cylinder 7 and the doctor plate 5 can be kept constant despite the adjustment. In the constructional example the doctor plate 5 is inclined through an angle of 45 degrees relatively to the horizonal. The said lower end of the doctor plate 5 is in the example bevelled at 45 degrees, so that the downwardly directed surface of said doctor plate terminates at said lower end in a sharp edge. Alternatively, said lower end of the doctor plate 5 may be rounded.
The take-up cylinder 4 is constructed so that it can be heated. In this way it is possible to manage without heating the dish 3 and the doctor plate 5. The treatment cylinder 7 in the constructional example is constructed as a cooling cylinder.
In the case of a roller drier said take-up cylinder would have to be cooled and said treatment cylinder heated.
The rotational speed of the take-up cylinder 4 and possibly the rotational speed of the treatment cylinder 7 also, is variable.
A doctor or scraper 9 is used for detaching the dried material from the treatment cylinder 7. The number 11 designates a reception trough for the treated material 10 which has been detached.
1. Treating apparatus comprising:
a. a rotatable pick-up cylinder, the lower portion of which is immersed in material to be treated;
b. a rotatable treatment cylinder parallel with, but
spaced from, the pick-up cylinder;
0. a doctor plate having a scraping edge to remove material from the pick-up cylinder, and extending downward to a second edge parallel with, but spaced from, said treatment cylinder, said plate serving to guide material from the pick-up cylinder to the second edge,
d. the treatment cylinder rotating in a direction such that the guided material is deflected around said second edge and, passes through said spacing while being transferred onto said treatment cylinder, the thickness of the transferred material being regulated by the spacing.
2. The apparatus defined in claim 1 in which:
a. the second edge of the plate is movable relatively to the treatment cylinder to vary said spacing.
3. The apparatus defined in claim 1 in which:
a. the pick-up cylinder and the plate are movable as a unit to vary said spacing.
4. The apparatus defined in claim 1 in which:
a. the surface of said pick-up cylinder is a heat exchange surface.