US3753298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Web dryer
Assignee: Beloit Corp
•
Filing: 1971-12-17
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Granted: 1973-08-21
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Expires: 1991-12-17
Abstract
Abstract A web dryer structure for thermal removal of moisture from a traveling web such as a web of paper coming from the press section of a paper making machine including a row of upper dryer drums and a row of lower dryer drums with the drums positioned to carry the web in a sinuous path successively between the upper and lower drums and the web wrapping the upper and lower surfaces of the drums respectively with upper and lower looped felts wrapping the web on the upper and lower surfaces of the drums with the felt guided by guide rolls which are shifted laterally of the spaces between the drums a distance in the direction of web movement so that the pockets formed between the felts and the drums are pressurized due to the induced flow of air by the traveling felts and the guide rolls pumping air through the felts.
Inventors
- 👤 D Ely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:07
CPC Classifications
F; F26; F26B; F26B13/00; F26B13/06; F26B13/08; D; D21; D21F; D21F5/00; D21F5/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
305 words
A web dryer for the thermal removal of moisture from a traveling web comprising in combination, a plurality of rotatably mounted upper dryer drums adapted to be heated to carry a web and evaporate moisture therefrom, a plurality of rotatably mounted lower dryer drums adapted to be heated to carry the web and evaporate moisture thereform, said drums positioned to carry the web in a sinuous path passing successively between the upper and lower drums with the web wrapping their upper and lower surfaces respectively, upper and lower looped belts formed of a pervious material accommodating the escape of water vapor from the web and wrapping the web on the upper and lower surfaces of the upper and lower drums respectively, upper and lower belt guide rolls for the upper and lower belts respectively with one guide roll between each pair of adjacent drums for the upper drums and for the lower drums, said lower belt guide rolls positioned to carry the portion of the lower belt between adjacent lower drums into the spaces between said lower drums, said upper belt guide rolls positioned to carry the portions of the upper belt between adjacent upper drums into the spaces between said upper drums, and said guide rolls positioned laterally of said spaces in the direction of web travel and located to carry each of the belts to receive the web directly from the other belt as the web travels between the upper and lower dryer drums so that the web is supported for its travel between the lower and upper drums and so that the web wraps a greater surface area of the drum on the onrunning side than on the offrunning side and air layers building up between the web and the guide rolls are dissipated on the offrunning side of the guide rolls.
Claim 2
Dependent Claim
305 words
A web dryer for the thermal removal of moisture from a traveling web comprising in combination, a plurality of rotatably mounted upper dryer drums adapted to be heated to carry a web and evaporate moisture therefrom, a plurality of rotatably mounted lower dryer drums adapted to be heated to carry the web and evaporate moisture thereform, said drums positioned to carry the web in a sinuous path passing successively between the upper and lower drums with the web wrapping their upper and lower surfaces respectively, upper and lower looped belts formed of a pervious material accommodating the escape of water vapor from the web and wrapping the web on the upper and lower surfaces of the upper and lower drums respectively, upper and lower belt guide rolls for the upper and lower belts respectively with one guide roll between each pair of adjacent drums for the upper drums and for the lower drums, said lower belt guide rolls positioned to carry the portion of the lower belt between adjacent lower drums into the spaces between said lower drums, said upper belt guide rolls positioned to carry the portions of the upper belt between adjacent upper drums into the spaces between said upper drums, and said guide rolls positioned laterally of said spaces in the direction of web travel and located to carry each of the belts to receive the web directly from the other belt as the web travels between the upper and lower dryer drums so that the web is supported for its travel between the lower and upper drums and so that the web wraps a greater surface area of the drum on the onrunning side than on the offrunning side and air layers building up between the web and the guide rolls are dissipated on the offrunning side of the guide rolls.
Claim 3
Dependent Claim
62 words
A web dryer structure for the thermal removal of moisture from a traveling web constructed in accordance with claim 1 wherein a flow of air is induced through the belts into the pockets between the lower belt and the upper drums and between the upper belt and the lower drums for aiding in transfer of the web and drying of the belts.
Claim 4
Dependent Claim
74 words
A web dryer structure for the thermal removal of moisture from a traveling web constructed in accordance with claim 1 wherein lead guide means is provided so that the upper belt travels in an upward path to the first upper drum and the first lower guide roll carrieS the lower belt to position the web in engagement with the upper belt as the web travels from the first lower to the second upper drum.
Claim 5
Dependent Claim
32 words
A web dryer structure for the thermal removal of moisture from a traveling web constructed in accordance with claim 2 wherein the air flows axially outwardly from the ends of said pockets.
Claim 6
Dependent Claim
51 words
A web dryer structure for the thermal removal of moisture from a traveling web constructed in accordance with claim 1 and including a lead guide for the upper belt directing it in a path onto the first upper drum with the lower belt then passing down over the first lower drum.
Claim 7
Dependent Claim
30 words
A web processing device for contioning a traveling web constructed in accordance with claim 1 wherein the guide rolls comprise a perforate shell and a suction gland in said shell.
Claim 8
Dependent Claim
209 words
A web dryer structure for the thermal removal of moisture from a traveling web comprising in combination: a plurality of rotatably mounted upper dryer drums adapted to be heated and carry a web and evaporate moisture therefrom, a plurality of rotatably mounted lower dryer drums adapted to be heated to carry the web and evaporate moisture therefrom, said drums positioned to carry the web in a sinuous path passing successively between the upper and lower drums with the web wrapping their upper and lower surfaces respectively, upper and lower looped belts formed of a pervious material accommodating the escape of water vapor from the web and wrapping the web on the upper and lower surfaces of the upper and lower drums respectively, and upper and lower belt guide rolls positioned respectively between adjacent upper and lower drums training said belts between the upper and lower drums and positioned so that the web is in close running relation to the belts to be controlled by a belt in all positions of its travel between the upper and lower drums, said guide rolls positioned so that the upper and lower belts wrap a greater arc of the upper and lower drums respectively on the onrunning side than on the offrunning side.
Claim 9
Dependent Claim
209 words
A web dryer structure for the thermal removal of moisture from a traveling web comprising in combination: a plurality of rotatably mounted upper dryer drums adapted to be heated and carry a web and evaporate moisture therefrom, a plurality of rotatably mounted lower dryer drums adapted to be heated to carry the web and evaporate moisture therefrom, said drums positioned to carry the web in a sinuous path passing successively between the upper and lower drums with the web wrapping their upper and lower surfaces respectively, upper and lower looped belts formed of a pervious material accommodating the escape of water vapor from the web and wrapping the web on the upper and lower surfaces of the upper and lower drums respectively, and upper and lower belt guide rolls positioned respectively between adjacent upper and lower drums training said belts between the upper and lower drums and positioned so that the web is in close running relation to the belts to be controlled by a belt in all positions of its travel between the upper and lower drums, said guide rolls positioned so that the upper and lower belts wrap a greater arc of the upper and lower drums respectively on the onrunning side than on the offrunning side.
Claim 10
Dependent Claim
44 words
A web dryer structure for the thermal removal of moisture from a traveling web constructed in accordance with claim 7 wherein a flow of air is induced in the open spaces between the lower felt and upper drums and upper felt and lower drums.
Claim 11
Dependent Claim
37 words
A web dryer structure for the thermal removal of moisture from a traveling web constructed in accordance with claim 7 and including a heated dryer means positioned outside of the belt on the first upper dryer drum.
Claim 12
Dependent Claim
232 words
A web processing device for conditioning a traveling web comprising in combination, an upper drum adapted to carry a web, a lower drum adapted to carry a web, said web wrapping the upper and lower surfaces of the upper and lower drums respectively, upper and lower belts wrapping the web drums, upper and lower belt guide rolls for the upper and lower belts respectively, with one guide roll between each pair of adjacent drums for the upper drums and for the lower drums, said guide rolls positioned to guide the portions of the upper and lower belts between adjacent pairs of drums toward each other into close running relationship between the drums so that the web is controlled for its entire travel between the upper and lower drums, said belts defining runs for the web between upper and lower drums with one belt defining one portion of the run and the other belt defining another portion of the run with said portions being at an angle to each other, said guide rolls positioned so that as the web is carried in the first portion of its run it is turned into the second portion of its run at an angle in the direction of the supporting belt so that an air layer carried on the belt tends to be removed by the pumping action of the offrunning side of the guide roll.
Claim 13
Dependent Claim
232 words
A web processing device for conditioning a traveling web comprising in combination, an upper drum adapted to carry a web, a lower drum adapted to carry a web, said web wrapping the upper and lower surfaces of the upper and lower drums respectively, upper and lower belts wrapping the web drums, upper and lower belt guide rolls for the upper and lower belts respectively, with one guide roll between each pair of adjacent drums for the upper drums and for the lower drums, said guide rolls positioned to guide the portions of the upper and lower belts between adjacent pairs of drums toward each other into close running relationship between the drums so that the web is controlled for its entire travel between the upper and lower drums, said belts defining runs for the web between upper and lower drums with one belt defining one portion of the run and the other belt defining another portion of the run with said portions being at an angle to each other, said guide rolls positioned so that as the web is carried in the first portion of its run it is turned into the second portion of its run at an angle in the direction of the supporting belt so that an air layer carried on the belt tends to be removed by the pumping action of the offrunning side of the guide roll.
Claim 14
Dependent Claim
41 words
A web processing device for conditioning a traveling web constructed in accordance with claim 10 wherein the guide rolls are positioned so that the web wraps a greater angle of the drUm on the onrunning side than on the offrunning side.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |