EP0194602B1 - A method for producing an endless belt with a smooth inner surface for use in a papermaking extended nip press - Google Patents
A method for producing an endless belt with a smooth inner surface for use in a papermaking extended nip press Download PDFInfo
- Publication number
- EP0194602B1 EP0194602B1 EP86103042A EP86103042A EP0194602B1 EP 0194602 B1 EP0194602 B1 EP 0194602B1 EP 86103042 A EP86103042 A EP 86103042A EP 86103042 A EP86103042 A EP 86103042A EP 0194602 B1 EP0194602 B1 EP 0194602B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- belt
- mold
- polymer
- fabric
- mandrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
- D21F3/0227—Belts or sleeves therefor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
- D21F3/0227—Belts or sleeves therefor
- D21F3/0236—Belts or sleeves therefor manufacturing methods
Definitions
- This invention relates to a method for producing an endless belt with a smooth inner surface for use in an extended press nip for dewatering a fibrous web formed in a papermaking machine.
- a web is formed by depositing a fibrous slurry on a forming wire. A large amount of water is drained from the slurry during this process, after which the newly-formed web proceeds to a press section which includes a series of press nips. The web finally proceeds to a drying section including heated dryer drums where the water content is reduced to a desirable level.
- the web is sandwiched between two moisture absorbing felts.
- the felts are trained around a cylindrical press roll with the web between them while a belt is arranged to transfer the pressure exerted by a pressure shoe to the felts and roll.
- the belt is provided with a very smooth surface for contacting the shoe so that it can transfer pressure to the felts and the fibrous web without overheating or wearing away. Furthermore the belt must be impermeable to oil used to lubricate its passage over the shoe which could contaminate the felts and the web.
- the belt was made by applying a polymer coating to the outer surface of an endless fabric. Since the belt is arranged so that its inner surface is the shoe-contacting surface, the endless coated fabric is then reversed (i.e. turned inside out). While this procedure was satisfactory for belts having a length of 7.4 m (24 feet) or more it has been found that it is difficult to reverse belts having a length of less than 7.4 m. Furthermore it was found that it was difficult to apply the coating to the outer surface of shorter belts.
- GB-A 2 106 557 shows a belt which is impregnated on only one side, that which comes into direct contact with the shoe. The other side is left unimpregnated and, as a consequence, provided voids for the temporary storage of water pressed from the wet paper sheet.
- the endless fabric from which the belt is made is stretched between two rollers and coated on the inside. Yet the coated surface still has to be ground smooth. No mandrel is used for the manufacture of the known belt.
- DE-A 3 318 984 teaches to pour a liquid polymer onto the moving fabric base held under tension.
- the base fabric is placed on a rotating cylinder, and the liquid polymer material is then applied to the fabric by means of a nozzle which travels back and forth parallel to the cylinder axis.
- the centrifugal force arising from the rotational motion of the cylinder would act to oppose the impregnation of the fabric by the polymer if the cylinder were to rotate too quickly. It would also appear that applying the liquid polymer material onto the fabric base with a nozzle would introduce air bubbles into the polymer.
- An extended press is provided for dewatering a travelling web of material.
- the nip 10 is defined by a cylindrical press roll 12, a pressure shoe 14 having an arcuate surface facing the press roll, and a belt 16 arranged such that it bears against the surface of the press roll.
- the arcuate surface of the pressure shoe has about the same radius of curvature as the press roll.
- the distance between the press roll and the pressure shoe may be adjusted by means of conventional hydraulic or mechanical apparatus (not shown) connected to a rod 18 pivotally secured to the shoe 14. The rod may also be actuated to apply the desired pressure to the shoe.
- the pressure shoe and press roll described above as shown in Figures 1-2 are conventional and that other arrangements are also well known in the art.
- Paper web 24 is carried to and away from the nip by a first felt 26.
- a second felt 28 is used to absorb the water expressed from web 24 in the nip.
- a lubricating means 30 is used to apply a lubricant such as oil to the inner surface 16' of belt 16 to further reduce friction between said inner surface and shoe 14.
- the belt is entrained by rollers 32 used to drive the belt in a predetermined path as shown.
- the belt 16 employed in accordance with the invention is shown in detail in Figure 3. It has proven to be superior to belts currently known to the art both from an operational standpoint and for manufacturing considerations.
- the belt 16 comprises a base fabric 34 which is impregnated with a polymeric material 36.
- Thermosetting resins such as polyurethanes have been found to be suitable impregnating materials. Preferably a 100% polyurethane resin should be used to avoid formation of bubbles during the curing of the belt structure.
- Thermoplastic polymers such as polypropylene are also acceptable.
- the base fabric 34 is sufficiently open to allow total impregnation. This eliminates the possibility of any voids forming in the final fabric which would allow the lubrication used between the belt and shoe to pass through the belt and contaminate the felt and fibrous web. It is endless in final construction and uniform in thickness.
- the fabric must also be made to have sufficient stability under paper machine conditions. In other words, it must have length stability, width stability, and guideability.
- the base fabric may comprise a single or multilayered flat woven fabric which has been heat stabilized and joined using normal joining techniques.
- the base fabric may be made of polyester or other polymeric materials having the necessary properties in accordance with the invention.
- the base may be made endless by endless weaving also.
- At least one of the sides or surfaces of the belt, such as side 16', is smooth for contacting the pressure shoe 14.
- Belts manufactured in accordance with the invention have been found to have many desirable characteristics. They move easily over the pressure shoe and are capable of transmitting pressure from the shoe to the web and press roll. Sufficient flexibility is obtained, and the belts have proven to be unaffected by lubricant applied prior to entering the press nip.
- the belt is manufactured in a cylindrical mold 38 ( Figure 4) with an outer shell 39 and a concentric mandrel 42.
- the mandrel is provided with a smooth outer surface 40.
- the spacing between the outer shell 39 of the mold and the inner mandrel determines the thickness or caliper of the belt.
- the base fabric 34 is first placed on the smooth mandrel surface 40 and then the mold 38 is hermetically sealed with cover 44.
- the pressure within the mold is reduced by substantially removing the air contained therein via a pipe 46 connected to a vacuum source (not shown).
- an appropriate polymer is injected into the mold through pipe 48. Because of the low pressure inside the mold, the polymer quickly fills the mold including the interstices of the fabric.
- a smooth inner polymer surface is formed along the mandrel surface 40.
- the polymer is cross-linked by applying heat to the mold. After the polymer has cured the finished belt may be removed from the mold.
- a polymer catalyst mixture may be used which is self cross linking if left undisturbed several hours.
- the resulting belt is shown in Figure 3, with the fabric 34 being fully impregnated with and impermeable to oil and other substances.
- the belt has a uniform caliper as a result of the molding operation.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Making Paper Articles (AREA)
- Belt Conveyors (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86103042T ATE54347T1 (de) | 1985-03-13 | 1986-03-07 | Eine methode zur herstellung eines endlosen bandes mit glatter innenoberflaeche zur verwendung fuer eine walze mit verlaengertem prepspalt zur papierherstellung. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US71145485A | 1985-03-13 | 1985-03-13 | |
US711454 | 1985-03-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0194602A1 EP0194602A1 (en) | 1986-09-17 |
EP0194602B1 true EP0194602B1 (en) | 1990-07-04 |
Family
ID=24858156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86103042A Expired - Lifetime EP0194602B1 (en) | 1985-03-13 | 1986-03-07 | A method for producing an endless belt with a smooth inner surface for use in a papermaking extended nip press |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0194602B1 (fi) |
JP (1) | JPS61258715A (fi) |
AT (1) | ATE54347T1 (fi) |
BR (1) | BR8506360A (fi) |
CA (1) | CA1282270C (fi) |
DE (1) | DE3672359D1 (fi) |
FI (1) | FI86315C (fi) |
MX (1) | MX162003A (fi) |
NO (1) | NO167097C (fi) |
ZA (1) | ZA859176B (fi) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3816004A1 (de) * | 1987-08-07 | 1989-02-16 | Albany Int Corp | Verfahren zur herstellung eines bandes fuer die papierherstellung |
US6752908B2 (en) | 2001-06-01 | 2004-06-22 | Stowe Woodward, Llc | Shoe press belt with system for detecting operational parameters |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5201978A (en) * | 1988-04-08 | 1993-04-13 | Beloit Technologies, Inc. | Method of fabricating a blanket for an extended nip press |
DE3909935C2 (de) * | 1989-03-25 | 1995-04-27 | Oberdorfer F Siebtech Gmbh | Verfahren und Vorrichtung zum Herstellen eines undurchlässigen und biegsamen Bandes oder Schlauches |
JPH06287885A (ja) | 1991-04-15 | 1994-10-11 | Yamauchi Corp | 脱水プレス用エンドレスベルト |
SE468483B (sv) * | 1991-05-24 | 1993-01-25 | Nordiskafilt Ab | Press samt saett att modifiera en press foer pressektionen i en pappersmaskin eller liknande |
US5792323A (en) * | 1995-09-07 | 1998-08-11 | Albany International Corp. | Spiral base structres for long nip paper machine press belts |
DE19537182A1 (de) * | 1995-10-06 | 1997-04-10 | Wuertt Filztuchfab | Preßvorrichtung mit verlängerter Preßzone |
DE50112624D1 (de) * | 2001-04-18 | 2007-07-26 | Stowe Woodward Ag | Schuhpressenbelt |
US7014733B2 (en) | 2002-05-14 | 2006-03-21 | Stowe Woodward L.L.C. | Belt for shoe press and shoe calender and method for forming same |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5133157A (ja) * | 1974-09-13 | 1976-03-22 | Bando Chemical Ind | Shoonseimasatsudendoberuto no seizohoho |
DE2844907C3 (de) * | 1978-10-14 | 1981-08-13 | Fa. Carl Freudenberg, 6940 Weinheim | Verfahren zur Herstellung eines Lieferwerksriemchens |
NO158430C (no) * | 1981-09-24 | 1990-10-04 | Albany Int Corp | Rem til avvanning av fiberbaner. |
JPS5954598U (ja) * | 1982-10-01 | 1984-04-10 | 市川毛織株式会社 | 抄紙機の広巾ニツププレス用加圧ベルト |
JPS59100789A (ja) * | 1982-12-02 | 1984-06-11 | アルバニ−・インタナシヨナル・コ−ポレ−シヨン | 脱水プレス |
JPS59192794A (ja) * | 1983-04-15 | 1984-11-01 | 市川毛織株式会社 | 抄紙機の面圧ニツププレス用加圧ベルト及びその製造方法 |
DE3318984A1 (de) * | 1983-05-25 | 1984-11-29 | Fa. F. Oberdorfer, 7920 Heidenheim | Herstellungsverfahren fuer zugfeste, undurchlaessige, biegsame baender insbesondere fuer pressen zum entwaessern von faserstoffbahnen |
JPH07101698B2 (ja) * | 1989-07-25 | 1995-11-01 | 日本電気株式会社 | 樹脂封止型半導体装置の製造方法 |
-
1985
- 1985-11-29 ZA ZA859176A patent/ZA859176B/xx unknown
- 1985-12-09 MX MX863A patent/MX162003A/es unknown
- 1985-12-17 FI FI855023A patent/FI86315C/fi not_active IP Right Cessation
- 1985-12-18 BR BR8506360A patent/BR8506360A/pt not_active IP Right Cessation
-
1986
- 1986-01-14 CA CA000499552A patent/CA1282270C/en not_active Expired - Fee Related
- 1986-02-10 JP JP61026075A patent/JPS61258715A/ja active Granted
- 1986-03-07 AT AT86103042T patent/ATE54347T1/de not_active IP Right Cessation
- 1986-03-07 EP EP86103042A patent/EP0194602B1/en not_active Expired - Lifetime
- 1986-03-07 DE DE8686103042T patent/DE3672359D1/de not_active Expired - Fee Related
- 1986-03-12 NO NO860939A patent/NO167097C/no not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3816004A1 (de) * | 1987-08-07 | 1989-02-16 | Albany Int Corp | Verfahren zur herstellung eines bandes fuer die papierherstellung |
US6752908B2 (en) | 2001-06-01 | 2004-06-22 | Stowe Woodward, Llc | Shoe press belt with system for detecting operational parameters |
Also Published As
Publication number | Publication date |
---|---|
EP0194602A1 (en) | 1986-09-17 |
FI86315C (fi) | 1992-08-10 |
ZA859176B (en) | 1986-08-27 |
NO167097C (no) | 1991-10-02 |
JPS61258715A (ja) | 1986-11-17 |
MX162003A (es) | 1991-03-20 |
FI86315B (fi) | 1992-04-30 |
NO167097B (no) | 1991-06-24 |
BR8506360A (pt) | 1986-12-09 |
DE3672359D1 (de) | 1990-08-09 |
FI855023A (fi) | 1986-09-14 |
JPH0357236B2 (fi) | 1991-08-30 |
CA1282270C (en) | 1991-04-02 |
FI855023A0 (fi) | 1985-12-17 |
ATE54347T1 (de) | 1990-07-15 |
NO860939L (no) | 1986-09-15 |
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