Web reeling method and apparatus
AssigneeValmet Corporation
InventorSakari Holm
Life of this patent
Estimating the term…
Abstract
Method and apparatus for reeling a web, suitable in the reeling of paper web, wherein the web is introduced over the mantle of a reeling cylinder and passed onto a reeling shaft on which the web is reeled. The pressure level in a wedge-shaped inlet nip defined between the reeling cylinder mantle and the incoming run of the web is adjusted to eliminate or reduce the positive pressure which would otherwise exist in the nip by ejecting air from the nip by means of a blowing member situated in connection with the nip. Air jets are discharged from the blowing member in a direction opposite to the direction of movement of the surface of the reeling cylinder and/or opposite to the direction of movement of the incoming web run and by means of the air jets, air is ejected from the inlet nip to reduce the pressure therein.
Claims11
A method for improving the operation of web reeling apparatus including a reeling cylinder having a mantle and a reeling shaft on which a web is reeled into a roll, comprising the steps of:
- introducing a web to be reeled as an open draw over said mantle of said reeling cylinder and passing the web from said reeling cylinder mantle onto said reeling shaft on which the web is reeled, said reeling cylinder and incoming open draw run of the web prior to contacting said mantle defining a wedge-shaped inlet nip;
- and
- ejecting air from said inlet nip to reduce the pressure therein by directing air jets from air blowing means situated in said inlet nip proximate to said reeling cylinder mantle in a direction substantially opposite to the direction of movement of said reeling cylinder mantle.
A method for improving the operation of web reeling apparatus including a reeling cylinder having a mantle and a reeling shaft on which a web is reeled into a roll, comprising the steps of:
- introducing a web to be reeled over said mantle of said reeling cylinder and passing the web from said reeling cylinder mantle onto said reeling shaft on which the web is reeled, said reeling cylinder and incoming run of the web prior to contacting said mantle defining a wedge-shaped inlet nip;
- and
- ejecting air from said inlet nip to reduce the pressure therein, said air ejecting step including a situating air blowing means in connection with said inlet nip, said air blowing means comprising a blowing member having a first wall in which nozzle means are provided proximate to said reeling cylinder mantle and a second wall situated proximate to said incoming run of the web, and wherein the method includes the further step of guiding the incoming run of the web over a guide surface of said blowing member as the web enters the inlet nip to stabilize the run thereof.
A method for improving the operation of web reeling apparatus including a reeling cylinder having a mantle and a reeling shaft on which a web is reeled into a roll, comprising the steps of:
- introducing a web to be reeled over said mantle of said reeling cylinder and passing the web from said reeling cylinder mantle onto said reeling shaft on which the web is reeled, said reeling cylinder and incoming run of the web prior to contacting said mantle defining a wedge-shaped inlet nip;
- and
- ejecting air from said inlet nip to reduce the pressure therein, said air ejecting step including situating air blowing means in connection with said inlet nip, said air blowing means comprising a blowing member having a first wall situated proximate to said reeling cylinder mantle defining a firt slot-like space therebetween, a second wall situated proximate to said incoming run of the web, defining a second slot-like space therebetween and a pair of nozzle means for directing air jets through said first and second slot-like spaces in directions opposite to the directions of movement of said reeling cylinder mantle and said incoming web run respectively whereby air is ejected from said inlet nip.
Web reeling apparatus, comprising:
- a reeling cylinder having a mantle;
- a reeling shaft on which a web is reeled into a roll, the web being introduced over said mantle of said reeling cylinder and passing from said reeling cylinder mantle onto said reeling shaft, said reeling cylinder mantle and an incoming run of the web prior to contacting said mantle defining a wedge-shaped inlet nip;
- and,
- air blowing means situated in connection with said inlet nip and adapted to communicate with a source of blowing air for directing air jets in at least one of a first direction opposite to the direction of movement of said reeling cylinder mantle and a second direction opposite to the direction of movement of said incoming web run, said air blowing means comprising a blow box including a first wall in opposed relationship to said reeling cylinder mantle defining a slot-like space therebetween, nozzle means provided in said first wall for directing air jets through said slot-like space in a direction opposite to the direction of movement of said reeling cylinder mantle, and a second wall having guide surface means situated proximate to said incoming run of the web for guiding and stabilizing the incoming run of the web,
- whereby air is ejected from said inlet nip to reduce the pressure therein.
Web reeling apparatus, comprising:
- a reeling cylinder having a mantle;
- a reeling shaft on which a web is reeled into a roll, the web being introduced over said mantle of said reeling cylinder and passing from said reeling cylinder mantle onto said reeling shaft, said reeling cylinder mantle and an incoming run of the web prior to contacting said mantle defining a wedge-shaped inlet nip;
- and,
- air blowing means situated is connection with said inlet nip and adapted to communicate with a source of blowing air for directing air jets in at least one of a first direction opposite to the direction of movement of said reeling cylinder mantle and a second direction opposite to the direction of movement of said incoming web run, said air blowing means comprising a blow box including a first wall situated proximate to said reeling cylinder mantle defining a first slot-like space therebetween, a second wall situated proximate to said incoming run or the web defining a second slot-like space therebetween, and a pair of nozzle means for directing air jets through said first and second slot-like spaces in direction opposite to the direction of movement of said reeling cylinder mantle and said incoming web run respectively, whereby air is ejected from said inlet nip to reduce the pressure therein.
Dependencies are inferred from the claim text.