Drying and gas or vapor contact with solids – Material treated by electromagnetic energy – Infrared energy
Patent
1997-09-15
2000-01-18
Nguyen, Dean T.
Drying and gas or vapor contact with solids
Material treated by electromagnetic energy
Infrared energy
34444, 34451, 162207, F26B 2310
Patent
active
060148187
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a method for drying a pulp web, using an apparatus having a great number of jet boxes arranged in piles positioned parallel with each other, and provided with openings through which the heated air, coming into the jet boxes, can stream out.
The invention also relates to a drying apparatus for carrying out the above method.
BACKGROUND INFORMATION
When producing pulp bales, there is created a long pulp web which passes a drying apparatus for drying. After passing through the drying apparatus, the pulp web continues on toward a scissors device, where the pulp web is cut into sheets.
U.S. Pat. No. 3,634,948 discloses a drying apparatus for paper webs, comprising jet boxes positioned between upper and lower turning rolls. This known jet box arrangement, however, has such a small drying capacity that in order to achieve satisfactory drying it is necessary to arrange the upper and lower turning rolls so that they can assist in the drying, functioning like drying cylinders. Of course, this is a very expensive solution.
This invention intends to eliminate the problems with known techniques and to provide a drying apparatus which is not only more effective than known types but due to its design is also more compact in a horizontal direction than the known types. This has been made possible by the fact that the method and the apparatus according to the invention is characterized by the steps and features, respectively, which are apparent from the claims.
SUMMARY OF THE INVENTION
The drying apparatus according to the invention is so designed that essentially all that portion of the pulp web which momentarily is between the upper and lower turning rolls is irradiated on both sides by heated air. Due to that fact the drying cylinders mentioned in the cited U.S. patent can be eliminated.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention shall be described more closely below with reference to the accompanying drawings:
FIG. 1 shows a schematic over a pulp web plant in which the drying apparatus according to the invention is an integral part;
FIG. 2 shows a perspective view of an outer frame work for the drying apparatus according to the invention in which frame work the jet boxes and the turning rolls of the drying apparatus are intended to be arranged;
FIG. 3 shows an embodiment of a jet box arrangement; and
FIG. 4 shows a jet box couple seen in the direction of the arrows IV--IV in FIG. 3.
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1 is shown how the pulp web 1, after having been produced in the schematically shown production plant P, comes into the drying apparatus 2 according to the invention at the portion 3, whereafter the pulp web goes essentially vertically up towards and rounds a first upper turning roll 4, turns downwards and goes essentially vertically down towards a first, lower turning roll 5, which is rounded by the pulp web, whereafter this one turns upwards again. In the illustrated embodiment the pulp web passes six upper turning rolls and five lower turning rolls before going further to a scissors device 6, where the pulp web is cut off to a uniform length for creating a pulp bale.
The purpose of the passage of the pulp web through the drying apparatus 2 is, as is apparent from the name, to dry the pulp web during passage through the same. For this reason, the drying apparatus 2 comprises a plurality of jet boxes 7, which are arranged in pairs in the areas between the pulp web parts 8, 9, going upwards and downwards. Preferably heated air is blown into these jet boxes in order to then be directed towards the passing pulp web parts 8, 9 through holes made in the portions of the jet boxes which are directed towards the pulp web parts.
FIG. 2 shows the outer frame work carrying the drying apparatus according to the invention. The outer frame work comprises in part a lower frame part 10 which carries the lower turning rolls 11, and in part an upper frame part 12. In this connection the turning rolls 11 rest on two opposi
REFERENCES:
patent: 3634948 (1972-01-01), Kobayashi
patent: 3851407 (1974-12-01), Rantala
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