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US 4,642,164 AGranted
Method and arrangement for web handling
AssigneeOy Wartsila Ab
InventorsHannu Hanhikoski, Lauri Kalliola, Hannu Malkia
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AssigneeOy Wartsila Ab
InventorsHannu Hanhikoski, Lauri Kalliola, Hannu Malkia
Estimating the term…
A method for the moistening of an endless web moving in a processing device, wherein the moistening substance is an evaporated fluid condensated on the web and said web is treated with a corresponding steam substance prior to this moistening. The method includes steps for supplying the evaporated fluid in a bag-like member formed by the web, the bag-like member being supported by an external member. The supply of the substance is carried out by means of a steamer appliance arranged transverse to the web. The method includes steps for adjusting the specific property of the steam substance in accordance to specific values measured from the web. The steamer appliance for the substance supply is separated from the external web support, the adjusted specific property being the steam current or the total amount of the steam and being distributed between separate zones in the web transverse direction, whereby the distribution is controlled by means of the ratio of the measured local specific value corresponding the zones. The method includes the generation of a pressure difference between the interior of the bag-like member and the space outside the web. The measurement of the specific value is continuously carried out in the transverse direction of the web.
A method of moistening a running web that bounds at least partially a moistening pocket defined by first and second rolls that are in parallel, spaced apart relationship, the web contacting the first roll at two substantially diametrically opposed positions and being wrapped around the second roll, the method comprising
Apparatus for moistening a running web, comprising first and second rolls in parallel, spaced apart relationship, about which the web can be trained so that the web contacts the first roll at two substantially diametrically opposed positions and is wrapped around the second roll and bounds at least partially a moistening pocket, and the apparatus also comprising means for delivering moistening substance in its vapor phase into the moistening pocket at a plurality of moistening locations that are spaced apart in the transverse direction of the web, means for measuring the value of a property of the web at a plurality of locations that are downstream of the moistening pocket with respect to the direction of travel of the web and are spaced apart in the transverse direction of the web, the value of which property depends on the moistness of the web, and means for separately controlling the rate at which moistening substance is delivered to each moistening location in dependence upon the measured values of said property.
A method of moistening a running paper web that bounds at least partially a moistening pocket defined by first and second rolls that are in parallel, spaced apart relationship, the web contacting the first roll at two substantially diametrically opposed positions and being wrapped around the second roll, the method comprising:
Dependencies are inferred from the claim text.