US3876499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Web forming between two wires having a curved path of travel
Assignee: Stora Enso Oyj
•
Filing: 1971-01-25
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Granted: 1975-04-08
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Expires: 1991-01-25
Abstract
Abstract Paper, cardboard and the like fibrous material is formed between two wires defining a wedge-shaped space between them. In order to obtain effective removal of water throughout the whole forming section draining elements are so positioned that the wires after first touching at a breast table at the beginning of the forming zone are guided at similar speeds along a broken or curved line formed through the points at which the draining elements support the wires. The radius of curvature of line of travel of the wires decreases continuously towards the point where the fibre web has been formed, whereafter the fibre web is guided over suction boxes into a press section. Preferably the length of the broken or curved line is such that so much water escapes from the fibre suspension when travelling this distance that the dry-substance content of the formed fibre web is at least 1.5 %. The draining elements may be doctors which scrape water from the lower surface of the wires.
Inventors
- 👤 Arto Antero Vesanto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:55
CPC Classifications
D; D21; D21F; D21F9/00; D21F9/003
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
195 words
A METHOD OF FORMING A PAPER, CARDBOARD OR LIKE FIBRE WEB, WHICH COMPRISES THE STEPS OF DISCHARGING A LIQUID SUSPENSION OF FIBRES FROM A HEAD BOX INTO A V-SHAPED GAP BETWEEN TWO ENDLESS WIRE SCREENS PASSING OVER RESPECTIVE BREAST ROLLERS TO A BREAST TABLE DISPOSED AT ONE SIDE OF SAID ENDLESS WIRE SCREENS SAID BREAST TABLE HAVING A CONVEX SURFACE SUPPORTING SAID ENDLESS WIRE SCREEN IN PARALLEL WITH ONE ANOTHER WITH THE WEB TO BE FORMED DISPOSED THEREBETWEEN, DRAINING WATER FROM SAID WEB BY LIQUID DRAINING MEANS DISPOSED BEYOND SAID BREAST TABLE ON THE SAME SIDE OF SAID ENDLESS WIRE SCREENS AS SAID BREAST TABLE, AND SUPPORTING SAID ENDLESS WIRE SCREENS ON SAID LIQUID DRAINING MEANS WITH THE POINTS OF CONTACT OF SAID LIQUID DRAINING MEANS WITH SAID ENDLESS WIRE SCREENS DIFINING FOR SAID ENDLESS WIRE SCREENS A CURVED PATH OF TRAVEL THE RADIUS OF CURVATURE OF WHICH DECREASES CONTINUOUSLY FOR SMOOTHLY INCREASING DEWATERING CENTRIFUGAL FORCE ALONG SAID PATH OF TRAVEL TOWARDS THE OUTLET END OF A DEWATERING FORMING SECTION FORMED BY SAID ENDLESS WIRE SCREENS AND SAID LIQUID DRAINING MEANS, AND DRYING SAID WEB AT A WEB DRYING SECTION BEYOND SAID WEB FORMING SECTION.
Claim 2
Independent Claim
195 words
A METHOD OF FORMING A PAPER, CARDBOARD OR LIKE FIBRE WEB, WHICH COMPRISES THE STEPS OF DISCHARGING A LIQUID SUSPENSION OF FIBRES FROM A HEAD BOX INTO A V-SHAPED GAP BETWEEN TWO ENDLESS WIRE SCREENS PASSING OVER RESPECTIVE BREAST ROLLERS TO A BREAST TABLE DISPOSED AT ONE SIDE OF SAID ENDLESS WIRE SCREENS SAID BREAST TABLE HAVING A CONVEX SURFACE SUPPORTING SAID ENDLESS WIRE SCREEN IN PARALLEL WITH ONE ANOTHER WITH THE WEB TO BE FORMED DISPOSED THEREBETWEEN, DRAINING WATER FROM SAID WEB BY LIQUID DRAINING MEANS DISPOSED BEYOND SAID BREAST TABLE ON THE SAME SIDE OF SAID ENDLESS WIRE SCREENS AS SAID BREAST TABLE, AND SUPPORTING SAID ENDLESS WIRE SCREENS ON SAID LIQUID DRAINING MEANS WITH THE POINTS OF CONTACT OF SAID LIQUID DRAINING MEANS WITH SAID ENDLESS WIRE SCREENS DIFINING FOR SAID ENDLESS WIRE SCREENS A CURVED PATH OF TRAVEL THE RADIUS OF CURVATURE OF WHICH DECREASES CONTINUOUSLY FOR SMOOTHLY INCREASING DEWATERING CENTRIFUGAL FORCE ALONG SAID PATH OF TRAVEL TOWARDS THE OUTLET END OF A DEWATERING FORMING SECTION FORMED BY SAID ENDLESS WIRE SCREENS AND SAID LIQUID DRAINING MEANS, AND DRYING SAID WEB AT A WEB DRYING SECTION BEYOND SAID WEB FORMING SECTION.
Claim 3
Dependent Claim
13 words
A method as claimed in claim 1, which includes draining said liquid by
Claim 4
Dependent Claim
13 words
A method as claimed in claim 1, including draining said liquid by means
Claim 5
Dependent Claim
26 words
A method as claimed in claim 1, including draining said liquid by means at said outlet end of rollers from which liquid is removed by centrifugal
Claim 6
Independent Claim
234 words
An apparatus for forming a paper, cardboard or like fibre web, which comprises: a. a first breast roller; b. a first endless wire screen extending over said first breast roller; c. a second breast roller; d. a second endless wire screen extending over said second breast roller and forming with said first endless wire screen a V-shaped gap; e. a head box for discharging fibre suspension into said V-shaped gap; f. a breast table disposed at one side of said first and second endless wire screens beyond said breast rollers; g. said breast table having a convex surface for supporting said first and second endless wire screens in parallel with one another with the web to be formed therebetween; h. liquid draining means disposed beyond said breast table on the same side of said first and second endless wire screens as said breast table; i. said liquid draining means supporting said first and second endless wire screens with the points of contact of said liquid draining means with one of said first and second endless wire screens defining for said first and second endless wire screens a curved path of travel the radius of curvature of which decreases continuously towards the outlet end of a dewatering forming section formed by said first and second endless wire screens and said liquid draining means for smoothly increasing dewatering centrifugal force along said path of travel; and
Claim 7
Independent Claim
234 words
An apparatus for forming a paper, cardboard or like fibre web, which comprises: a. a first breast roller; b. a first endless wire screen extending over said first breast roller; c. a second breast roller; d. a second endless wire screen extending over said second breast roller and forming with said first endless wire screen a V-shaped gap; e. a head box for discharging fibre suspension into said V-shaped gap; f. a breast table disposed at one side of said first and second endless wire screens beyond said breast rollers; g. said breast table having a convex surface for supporting said first and second endless wire screens in parallel with one another with the web to be formed therebetween; h. liquid draining means disposed beyond said breast table on the same side of said first and second endless wire screens as said breast table; i. said liquid draining means supporting said first and second endless wire screens with the points of contact of said liquid draining means with one of said first and second endless wire screens defining for said first and second endless wire screens a curved path of travel the radius of curvature of which decreases continuously towards the outlet end of a dewatering forming section formed by said first and second endless wire screens and said liquid draining means for smoothly increasing dewatering centrifugal force along said path of travel; and
Claim 8
Dependent Claim
11 words
Apparatus as claimed in claim 5, wherein said liquid draining means
Claim 9
Dependent Claim
11 words
Apparatus as claimed in claim 5, wherein said liquid draining means
Claim 10
Dependent Claim
25 words
Apparatus as claimed in claim 5, wherein said liquid draining means comprise, at said outlet end, rollers from which liquid is removed by centrifugal force.
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |