US2686463A - Automatic deckle edge separating press roll section - Google Patents

Description

Aug. 17, 1954 HORNBOSTEL 2,686,453

AUTOMATIC DECKLE EDGE SEPARATING PRESS ROLL SECTION Filed March 11, 1948 LLOYD HORNBOSTEL Patented Aug. 17, 1954 AUTOMATIC DECKLE EDGE SEPARATING PRESS ROLL SECTION Lloyd Hornbostel, Beloit, Wis., assignor to Beloit Iron Works, Beloit, consin Wis., a corporation of Wis- Application March 11, 1948, Serial No. 14,344

8 Claims.

This invention relates to improvements in methods and apparatus for automatically separating the deckle edges from paper during the manufacture thereof and for the disposing of the deckle before it is dried and without damaging the main sheet.

Heretofore, especially in the manufacture of lightweight delicate papers, such as tissue papers, the deckle edges of the paper have been dried along with the main sheet to prevent damage to the main sheet which is likely to occur when wet deckles are stripped from wet delicate main sheets. The present invention now makes possible the separation of deckles from even the most delicate wet sheets without damaging the sheets, thereby effecting large savings in heat and power because the deckles need not be dried.

In accordance with this invention, the deckle on opposite edges of a paper web are cut by fine water jets while still on the forming wire of the paper machine. Subsequently, in the press section of the paper machine while the paper web is being de-watered, the severed deckles are caused to adhere to a press roll while the main paper web is transferred to a felt, and the deckles are thereafter scraped from the roll and returned for re-use in paper stock.

One of the objects of the invention is to provide a new and simplified method of separating the deckle edge portions from a paper web.

Another object of the invention is to provide a method and an apparatus for separating deckle edges from a wet fragile paper sheet without damaging the sheet and before the sheet and edges reach the drying section of a paper machine.

Another object of the invention is to provide apparatus for separating and removing the deckle from paper webs and which may be readily incorporated in the forming and press roll sections.

Another object of the invention is to provide a method and apparatus for separating the deckle edges from a paper web ahead of the drying press section in a paper mill and for returning the separated deckle for re-use in the forming of paper.

Other objects and advantages of the invention will be mentioned hereinafter or will become apparent from a perusal of the following specification.

In the drawing:

Figure 1 is a diagrammatic illustration of a preferred embodiment of the invention;

Figure 2 is a plan view from the plane of the line II-II of Figure 1; and

Figure 3 is a diagrammatic view taken approximately from the plane of the line III-III of Figure 1.

Referring further to the drawing, FW represents a looped forming wire commonly employed 2 in a Fourdrinier type paper making machine and which passes over the suction boxes [0, II and i2 and thereafter between the nip A of a pair of suction rolls [3 and M. The wire then passes around the guide rolls l5 and I6 and is returned for passage again through the paper forming machine.

A felt it, in the form of an endless belt, is trained around the guide and tensioning rolls i8, i9, 2G, 2! and 22 and rolls [4 and 23. The forming wire after passing over the suction box 24 in the suction roll l3 passes over part of suction box 25 which transfers the paper web from the forming wire to the felt IT. The felt carries the paper along on its under surface to the nip B of the press roll 23 and suction roll 26.

At the nip of the rolls 23 and 2B the suction box 21 transfers the paper web to the top surface of another felt 28 which is trained over the guide and tensioning rolls 29 to '34, inclusive.

Turning now to the problem of separating the deckle from the main web of paper, as the paper sheet is being formed on the forming wire FW, the overall width of the sheet will be determined as usual by the customary deckle straps, not herein shown. However, this overall width includes some deckle (D and D) on each longitudinal edge of the sheet. To cut off this deckle from the main sheet there is provided above any one of the suction boxes it, I! or I2 a pair of nozzles N each shaped and connected with a source of water supply under pressure to project a fine jet of water with considerable force downwardly upon the forming wire. -The two jets are so spaced apart that the deckle will be cut off to leave a main web of a desired width and having straight edges. In accordance with this invention, the severed strip of deckle at each side of the main web is allowed to remain on the forming wire and travels along with the main sheet.

Thereafter, as the felt I! picks up the paper web on its under surface at suction box 25, it will also pick up the severed deckles and carry them along. Likewise, when the suction box 2'! transfers the paper web to the felt 28, the two deckles will also be transferred thereby to felt 28 and carried to the press roll assembly consisting of a plain central press roll 35 and two suction rolls 36 and 3! coacting' with the roll 35 to form two suction pressure nips.

A suction box 38 in the roll 36 draws water through the felt 28 from the first nip 0 of the press roll assembly. After the felt 28 has passed through this first nip defined by the rolls 35 and 36, it hugs the under side of roll 35 for a short distance to wrap the web against the roll 35. The felt is then directed around roll 29 away from the web while the main paper web and deckles adhere to and travel with the roll 35 to the sec.-

in length to the width of the paper web itself to terminate the suction zones inwardly from the deckles D and D of the main-"web! i iccordingly the two strips of deckles D and D pass through the second nip and continue to adhere to the roll 35 to travel over the topofthe-rol'lwto aselfdumping scraper blade 4 I This blade scrapes off the deckles and drops them by gravity .onto a broke conveyor 42 which returns the'rnfor' re pulping for use in the production of further paper.

The suction area 39 extends on both sides of the nip and is followed by thesuction area 4!] beyond the nip. These two areas may be operated under different degrees of vacuum. If desired, a single suction area can be used. These suction areas act through the felt 43 on the main web to transfer the latter to the top surface of the felt. The paper web PW, freed of its deckles D and D, is then trained oif the felt 43 as the latter passes around the roll M. -;The felt 43 is trained over the guide and tensioning rolls 44, 45, d6, 47 and 48 and-back over thepress roll 31. The web PW is then trained over the roll 49 and around the under side of the first drier drum 58 of the paper machine drying section.

A felt 5i trained over the guide and tensioning rolls 52, 53 and 5t, and other rol1s,not shown, holds the web PW against the drum 5%! and the web then continues in a serpentine path-around the drums of the drying section.

From the above descriptions it will be understood that this invention provides an effective suction transfer felt arrangement for conveying severed deckles and the main center sheet from the forming surface of a paper machine to the press section of 'the machine where the deckles are separated without damaging the sheet. The invention utilizes the center roll of a three-roll press to convey the .deckles away from the main sheet to a gravity or self-dumping scraper.

It is preferred that the center press roll from which the deckles are scraped be of sufficiently large diameter so that there will be ample space above the paper web for thepositioning of a scraper blade and a box into which the separated deckle may be dropped by gravity Having shown and described my invention, I claim:

1. The method of separating deckle edge portions from a fibrous web without damaging the web and before the web is subjected to a heat dry ing treatment which comprises forming a fibrous web on a traveling forming surface of a paper making machine, severing the deckle edges from the fibrous web while the web'anded'ges are still supported on said forming surface, effecting a suction transfer of the fibrous web and severed deckle edges from the forming surface to a coriveyor felt without distm'bingthe'side by "side relationship of the fibrous web and decide edges; cov ering the fibrous web and deckle-edges on sai'd felt with a second felt, subjecting the fibrous web and deckle edges between'said felts -'to the combined action of suction and pressure, removing the first felt from the fibrous web'iand deckle edges while retaining the web "and edges in their original side :by side relation on the covering'felt, contacting the fibrousweb and decide edges against a press roll, transferring the fibrous web and decide edges from the covering felt to the press roll without disturbing the side by side relationship of the web and deckle edges, subjecting the" fibrous web-and decide-edges on said press roll to pressure treatment in a nip, subjecting the fibrous web alone to the action of suction in said nip, separating the fibrous web from the press roll underth'e' infiuence of said suction, conveying the declileedges alone around the top of said press roll, scraping the deckle edges from the descend- ;ing side of" the press roll, discharging the scraped deckle edges under the influence of gravity away from said press roll, and drying the web alone by thesub'ject'ion of the same to heat, whereby the severed deckle edges protect the adjacent web edges during subjection of the web to nip pressures with the subsequent separation of the deckle edges from the web prior to drying thus eliminating the expense of drying the edges.

2. The method of separating deckle edge portions from a delicate light-weight paper without damaging the paper and without drying the deckle edges under the influence of heat which comprises simultaneously transferring a fibrous web-and its severed deckle edge portionsfrom the forming surface of a paper machine to a conveyor felt without disturbing the side by side relationship of the deckle edge portions and fibrous web, covering the fibrous web and deckle edge portions onsaid felt with a second felt, subjecting the web and deckle edge portions between the felts to the action of suction and pressure, separating the first mentioned felt from the fibrous web and .deckle edge portions, conveying the fibrous web and deckle edge portions on the second felt through the first nip of a double nip press roll assembly in contact with a top press roll, transferring the fibrous web and deckle edge portions from the second felt to said top press roll, conveying the fibrous web and deckle edge portions around the under side of the top press roll to the second'nip of the assembly, subjecting both the web and deckle edge portions to mechanical pressure-at said second nip with the deckle edge portions protecting the corresponding edges of said web, subjecting the fibrous web-portion alone in said second nip to the action of suction for removing the fibrous web from the press roll, and conveying the deckle edge portions alone on said press roll away from said second 3. lhe method of separating deckle edge portions from a; paper web which comprises forming the paper web on the forming surface of a paper making machine, advancing the web on said forming surface through jets of water for severing deckle edge portions from the main central portion of--the web, conducting the main paper web and decide edge portions through a nip formed by a plain roll and a suction roll, supporting the web and deckle edge portions on a felt in said hip, and by means of suction transferring the main web to said felt while the deckle is allowed to adhere to the plain roll to travel therewith away from said nip and main web.

4. The method of separating opposed lateral deckle edge strips from a desired central portion of a moving paper web, which comprises supporting said moving web with deckle edge portions thereon on a moving forming surface, severing said 'deckle edge strips from the web while the web and edge strips are still on the moving forming-surface, bringing a pick up felt into contact with the top surface of the web and edge strips and applying suction through the felt to pick up ihel nd ed e. s f (thee f nger t e We? and edge strips between the pick up felt and a second felt to dewater the web and edge strips and applying suction through the second felt to transfer the web and edge strips thereto; next pressing the web and edge strips between the second felt and a travelling smooth supporting surface to dewater the web and edge strips and adhere the same to said surface; next pressing the web and edge strips between said surface and a third felt to further dewater the web and edge strips and applying suction through the third felt across the web only and not across the edge strips to transfer the web to the third felt and retain the edge strips adhered to said surface; and finally carrying said edge strips away from the third felt on said surface and then removing the edge strips from said surface.

5. A paper machine having a forming surface of predetermined width adapted to convey a moist paper web thereon and having cutting jets for severing deckle edges from said webpositioned over said surface at points spaced apart a predetermined transverse distance shorter than the surface width, a bare press roll of substantially the width of the forming surface, a felt covered press roll of substantially the width of the forming surface cooperating with said bare press roll to define a press nip, a conveying means for receiving the wet web plus severed deckle edges from the forming surface and feeding the same into the press nip, and a suction box within said felt covered press roll and covered by the felt of said felt covered press roll, said suction box being of less width than the felt covered press roll and having substantially the width of said transverse distance and being positioned immediately behind the press nip to effect transfer of said web to said felt while retaining the edges on the bare roll.

6. A paper machine having a forming surface of predetermined width adapted to convey a moist paper web thereon and having cutting jets for severing deckle edges from said web positioned over said surface at points spaced apart a predetermined transverse distance shorter than the forming surface width, a bare press roll of substantially the width of the forming surface, a felt covered press roll of substantially the width of the forming surface cooperating with said bare press roll to define a press nip, a conveying means for receiving the wet web plus severed deckle edges from the forming surface and feeding the same into the press nip, and a suction box within said felt covered press roll and covered by the felt of said felt covered press roll, said suction box being of less width than the felt covered press roll and having substantially the width of said transverse distance and being positioned immediately behind the press nip to effect transfer of said web to said felt while retaining the edges on the bare roll and a self-dumping doctor cooperating with said bare roll to scrap ofi the edges so retained on the bare roll.

7. A paper machine having a forming surface of predetermined width adapted to convey a moist paper web thereon and having cutting jets for severing deckle edges from said web positioned over said surface at points spaced apart a predetermined transverse distance shorter than the forming surface width, a three roll suction press including a top plane press roll and a pair of suction rolls coacting with the bottom side of said top plane press roll for defining first and second press nips each having substantially the width of the forming surface, conveying means for receiving the wet web plus severed deckle edges from the forming surface and feeding the same into the first press nip wherefrom the web and severed deckle edges are carried to the second press nip on the top plane press roll, a felt lapped about the suction roll coacting with the top plane press roll at the second press nip, and a suction box within the suction roll cooperating with the top plane press roll at the second press hip and covered by said felt, said suction box being of less width than the second press nip and having substantially the width of said transverse distance and being positioned immediately behind the second press nip to effect transfer of the web to said felt while retaining the deckle edges on the bare roll.

8. A paper machine having a forming surface of predetermined width adapted to convey a moist paper web thereon and having cutting jets for severing deckle edges from said web positioned over said surface at points spaced apart a predetermined transverse distance shorter than the forming surface width, a first looped felt for coacting with the forming surface to pick up the web and severed deckle edges therefrom, a first press roll within the loop of said first felt, a second looped felt, a second press roll within the loop of said second felt cooperating with said first press roll to define a first press nip of substantially the width of the forming surface, a suction box of substantially the width of the forming surface within said second press roll for transferring the web and its deckle edges from said first felt to said second felt at said first press nip, a third press roll that is a bare press roll, a fourth press roll also within the loop of said second felt coacting with said third press roll to define a second press nip of substantially the width of the forming surface whereat the web and severed deckle edges are transferred to the bare roll surface of said third press roll, a third looped felt, a fifth press roll within the loop of said third press roll and coacting with said third press roll to define a third press nip of substantially the width of the forming surface, a suction box in said fifth press roll covered by said third felt and having a width that is shorter than the width of said third press nip and substantially the width of said transverse distance, said suction box in said fifth press roll being positioned immediately behind said third press nip to effect transfer of said web to said third felt while retaining the deckle edges on said third press roll, and a self dumping doctor cooperating with said third press roll to scrape off the deckle edges retained on the bare roll surface thereof.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 16,430 Blake Jan. 20, 1857 702,205 Hanscom June 10, 1902 726,980 Outerson May 5, 1903 1,662,200 Merrill Mar. 13, 1928 1,701,226 Collins Feb. 25, 1929 1,761,051 Rivard June 3, 1930 1,810,316 Lamory June 16, 1931 1,945,118 McVicker et a1 Jan. 30, 1934 1,949,188 Smith Feb. 27, 1934 2,209,756 Berry July 30, 1940 2,209,761 Berry July 30, 1940 2,251,492 Malkin Aug. 5, 1941 2,281,294 Malkin Apr, 28, 1942

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