US3447451A - Press cylinder for paper machines and pulp drying machine - Google Patents

Press cylinder for paper machines and pulp drying machine Download PDF

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Publication number
US3447451A
US3447451A US554387A US3447451DA US3447451A US 3447451 A US3447451 A US 3447451A US 554387 A US554387 A US 554387A US 3447451D A US3447451D A US 3447451DA US 3447451 A US3447451 A US 3447451A
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United States
Prior art keywords
cylinder
holes
press
mantle
inner cylinder
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Expired - Lifetime
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US554387A
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English (en)
Inventor
Olavi Herman Meskanen
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Valmet Montreal Inc
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Valmet Oy
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Publication of US3447451A publication Critical patent/US3447451A/en
Assigned to VALMET-DOMINION INC., A COMPANY OF CANADA reassignment VALMET-DOMINION INC., A COMPANY OF CANADA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VALMET OY
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    • 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
    • D21F3/08—Pressure rolls
    • D21F3/083—Pressure rolls perforated

Definitions

  • a press cylinder for paper machines and pulp drying machines has two hollow cylinders located one within the other and firmly engaging each other without play, the inner cylinder having a greater thickness than the outer cylinder, both cylinders having a large number of substantially uniformly distributed perforations, the outer cylinder having a larger number of perforation than the inner cylinder, the perforations of the outer cylinder being smaller than those of the inner cylinder, the perforations of the inner cylinder having enlarged outer portions, substantially all perforations of the outer cylinder registering with the perforations of the inner cylinder and at least two perforations of the outer cylinder partly coinciding with a perforation of the inner cylinder.
  • the present invention has reference to a press cylinder with through holes for paper machines and pulp machines.
  • lt is previously known practice to use in the press sections of paper machine and pulp drying machines as one of a pair, a cylinder, the mantle of wihch has been pierced with drilled holes. These holes have enabled the water released from the web to be dried to pass into this cylinder, from where it has been drained through the end of the cylinder. It has likewise been a known procedure to apply vacuum inside the perforated cylinder at the pressure point to boost the removal of water at the pressure point. At the other component of the pair also a cylinder with holes not extending through the mantle has been used.
  • the present invention provides the creation of a press cylinder with through holes which is free of the above- 3,447,451 Patented June 3, 1969 ice mentioned drawbacks and which operates well without vacuum acting inside the cylinder.
  • the press cylinder is most appropriately composed of two coaxial, hollow cylinders placed inside each other, with their meeting mantle surfaces joined with shrink fit over the entire length of the mantle, and with the irmer cylinder attached to the shaft journals at its ends.
  • the inner, thick-walled cylinder acts as load-supporting frame of the combination and it is perforated by holes of 4-5 mm. diameter passing through the mantle, which are fluted to become 8 mm. in diameter at their outer end, the hole density being -200 holes per din. of the outer surface of said cylinder.
  • the outer cylinder may be thin-walled and provided with a substantially denser perforation than the inner one.
  • This latter perforation consists of holes passing through the cylinder mantle and having a diameter of 2.5-3.5 mm., that is, considerably smaller than the diameter of the holes in the inner cylinder, and the perforation density being 400-500 holes per drn. of the outer mantle surface of this latter cylinder.
  • the holes are so placed in the outer cylinder that they always encounter a hole in the inner cylinder, in other words, that they coincide at least partially with a hole of the latter.
  • the outer cylinder may be made up of two or several short cylinder sections of the kind described, placed end to end over the inner cylinder.
  • the hole density on the outer surface of the press cylinder can be made as high as 400-500 holes per (1111. of the outer mantle surface of the cylinder, by which the water removing capacity of the press is essentially improved because the flow path of the water on the cylinder will be only 30-50% of what it is on existing perforated cylinders, before the water encounters a hole.
  • the resistance to flow is consequently considerably reduced. It follows that it is possible to remove more water at the pressure point unchanged line pressure.
  • the shorter horizontal flow paths enable the web to be dried to be subjected to higher pressure in the press without danger of marking or crushing of the web. A higher dry content is thus obtained when a cylinder according to the present invention is used, even at high machine speeds and with reasonable operating costs, without impairment of the web quality.
  • FIGURE 1 shows a cross section through part of a press cylinder according to the present invention.
  • FIGURE 2 shows an end view, on partial section, of a pair of cylinders in the press section of a felt drying press when the lower cylinder at the press point has been made according to the present invention.
  • FIGURE 3 is a schematical representation of the press section of a paper machine provided with press cylinders according to the present invention.
  • the press cylinder according to the present invention is composed of a thin, hollow outer cylinder 1 and a hollow inner cylinder of considerably greater wall thickness 2 placed inside the former and with its outer mantle surface adjoining without play to the inner surface of the outer cylinder, and both cylinders being rigidly coupled together.
  • the inner cylinder 2 constitutes the load-bearing frame of the composite press cylinder.
  • the mantle of the inner cylinder 2 is uniformly perforated by holes 3 passing through the mantle and having an enlargement 4 at their outer ends. As has been said before, the diameter of these holes is most appropriately made to be 45 mm.
  • the mantle of the outer cylinder is likewise perforated by through holes 5, which have a considerably smaller diameter than those in the inner cylinder, for instance 2.53.5 mm., and a considerably higher hole density than in the inner cylinder, for instance 400500 holes per dm. of the outer mantle surface.
  • the holes in the mantle of the outer cylinder 1 always coincide with the enlarged end of some hole or holes 3 in the mantle of the inner cylinder.
  • a hOle 3 in the mantle of the inner cylinder is thus able to drain the water coming from several holes 5 in the mantle of the outer cylinder.
  • the lower cylinder 6 is one according to the present invention.
  • the upper cylinder at the pressure point consists of a hollow, rubber-coated cylinder 7, its mantle being perforated with through holes 8, of which only one hole at the pressure point has been indicated.
  • a stationary pressure box 9 from which compressed air is impelled through the groove 11 in the sliding block to the pressure point.
  • This compressed air jet blows the water detached by the pressure from the felt through the holes in the cylinder 6 built according to the present invention, into the cylinder.
  • oscillating nozzles 12 have been arranged, which direct a high pressure jet towards the holes of the cylinder, the jet passing through the holes in the cylinder to the splash trough 13 and cleaning the said holes in its passage.
  • the outer surface of the lower cylinder 6 is kept clean in a manner previously known in itself, by the aid of an oscillating scraper 14. It may be mentioned that the other cylinder working at the presure point against a cylinder according to the present invention may as well be a cylinder of some other kind than that specifically described above, for instance an unperforated rubbercoated cylinder.
  • FIGURE 3 a pressure arrangement has been shown in which a press cylinder according to the present invention is employed.
  • the fibre substance web 15 travels together with the felt 16 over the feltguide roller 17 to the paper drying press consisting of a rubber-coated upper cylinder 18 and a lower cylinder 19 according to the present invention.
  • the paper drying press consisting of a rubber-coated upper cylinder 18 and a lower cylinder 19 according to the present invention.
  • the felt drying press consisting of a rubber-coated upper cylinder 23 with, perforated mantle and a lower cylinder 24 accordinging to the present invention.
  • compresed air is blown through the upper cylinder to the pressure point.
  • the felt passes over felt guide-roller 24 and over the tension and guide-rollers 25 and 26 back to the felt guide-roller 17.
  • a press cylinder for paper machines and pulp drying machines comprising two hollow cylinders located one within the other and firmly engaging each other, the inner cylinder having a greater thickness than the outer cylinder, both cylinders having a large number of holes, the outer cylinder having a larger number of holes than the inner cylinder while the holes of the outer cylinder are smaller in size than the holes of the inner cylinder,
  • the holes of the inner cylinder each having enlarged outer portions, at least two holes of the outer cylinder partly coinciding with a hole of the inner cylinder, substantially all holes of the outer cylinder registering with the holes of the inner cylinder.
  • Press cylinder according to claim 1 characterized in that the hole density of the inner cylinder is 150-200 holes per dm. of the outer surface of its mantle, the diameter of the holes is 4-5 mm. and the hole density of the outer cylinder is 400-500 holes per drn. of the outer surface of its mantle, the hole diameter being 2.5-3.5 mm.

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US554387A 1965-06-01 1966-06-01 Press cylinder for paper machines and pulp drying machine Expired - Lifetime US3447451A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI130665 1965-06-01

Publications (1)

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US3447451A true US3447451A (en) 1969-06-03

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US554387A Expired - Lifetime US3447451A (en) 1965-06-01 1966-06-01 Press cylinder for paper machines and pulp drying machine

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US (1) US3447451A (enrdf_load_stackoverflow)
SE (1) SE319685B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710470A (en) * 1970-09-03 1973-01-16 Kimberly Clark Co Jacketed press roll
US3754661A (en) * 1971-04-15 1973-08-28 Fmc Corp Apparatus for clarifying liquid
US3873450A (en) * 1971-10-21 1975-03-25 Harleyford Hydrosand Equipment Separation of liquids from wet solids
US4371376A (en) * 1981-06-17 1983-02-01 Norwood Minerals, Inc. Consolidation of slurries of solid particulate materials
US5107757A (en) * 1985-12-30 1992-04-28 Ebara Corporation Apparatus for dewatering waste material by capillary action
US5736007A (en) * 1992-10-02 1998-04-07 Auckland Uniservices Limited Method of liquor removal from particulate solids
US6284103B1 (en) * 1999-07-21 2001-09-04 Voith Sulzer Paper Technology North America, Inc. Suction roll shell in a paper-making machine and method of manufacturing same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US358974A (en) * 1887-03-08 Paul h
US714856A (en) * 1901-08-28 1902-12-02 Galland Henning Pneumatic Malting Drum Mfg Company Press.
US1793688A (en) * 1931-02-24 gardella
US2069448A (en) * 1934-06-27 1937-02-02 Frank L Ireland Rotary press
US2798424A (en) * 1955-04-14 1957-07-09 Equipment Dev Co Inc Filter
US2876697A (en) * 1954-12-09 1959-03-10 Stamicarbon Press for separating material
US3097995A (en) * 1956-01-06 1963-07-16 Beloit Iron Works Suction roll perforation design

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US358974A (en) * 1887-03-08 Paul h
US1793688A (en) * 1931-02-24 gardella
US714856A (en) * 1901-08-28 1902-12-02 Galland Henning Pneumatic Malting Drum Mfg Company Press.
US2069448A (en) * 1934-06-27 1937-02-02 Frank L Ireland Rotary press
US2876697A (en) * 1954-12-09 1959-03-10 Stamicarbon Press for separating material
US2798424A (en) * 1955-04-14 1957-07-09 Equipment Dev Co Inc Filter
US3097995A (en) * 1956-01-06 1963-07-16 Beloit Iron Works Suction roll perforation design

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710470A (en) * 1970-09-03 1973-01-16 Kimberly Clark Co Jacketed press roll
US3754661A (en) * 1971-04-15 1973-08-28 Fmc Corp Apparatus for clarifying liquid
US3873450A (en) * 1971-10-21 1975-03-25 Harleyford Hydrosand Equipment Separation of liquids from wet solids
US4371376A (en) * 1981-06-17 1983-02-01 Norwood Minerals, Inc. Consolidation of slurries of solid particulate materials
US5107757A (en) * 1985-12-30 1992-04-28 Ebara Corporation Apparatus for dewatering waste material by capillary action
US5736007A (en) * 1992-10-02 1998-04-07 Auckland Uniservices Limited Method of liquor removal from particulate solids
US6284103B1 (en) * 1999-07-21 2001-09-04 Voith Sulzer Paper Technology North America, Inc. Suction roll shell in a paper-making machine and method of manufacturing same

Also Published As

Publication number Publication date
SE319685B (enrdf_load_stackoverflow) 1970-01-19

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Date Code Title Description
AS Assignment

Owner name: VALMET-DOMINION INC., 795 FIRST AVENUE, LACHINE, Q

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VALMET OY;REEL/FRAME:004331/0750

Effective date: 19840503