US3874600A - Pulper tank - Google Patents

Pulper tank Download PDF

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Publication number
US3874600A
US3874600A US371745A US37174573A US3874600A US 3874600 A US3874600 A US 3874600A US 371745 A US371745 A US 371745A US 37174573 A US37174573 A US 37174573A US 3874600 A US3874600 A US 3874600A
Authority
US
United States
Prior art keywords
frusto
angle
tank
conical
rotor
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
Application number
US371745A
Other languages
English (en)
Inventor
Robert Blakeley Honeyman
Robert Lee Crawford
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Morden Inc
Original Assignee
Morden Machine Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Morden Machine Co filed Critical Morden Machine Co
Priority to US371745A priority Critical patent/US3874600A/en
Priority to GB382574A priority patent/GB1426038A/en
Priority to CA191,290A priority patent/CA995506A/en
Priority to FR7403000A priority patent/FR2234420B1/fr
Priority to SE7401928A priority patent/SE406159B/xx
Priority to JP49019049A priority patent/JPS5248643B2/ja
Priority to DE2423222A priority patent/DE2423222A1/de
Application granted granted Critical
Publication of US3874600A publication Critical patent/US3874600A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers

Definitions

  • ABSTRACT A pulper tank structure wherein a horizontal bottom wall associated with a rotor is connected to a verti cally extending cylindrical sidewall thereabove and interconnected by at least two upwardly divergent intermediate frusto-conical walls and where the fillet angles are specified for advantageously increasing stock surface rate or reducing power consumption.
  • the stock (at 4-77c consistency) discharges from the rotor blades or vanes at a given velocity and resultant angle caused by the combined centrifugal reaction, the blade angle, and the peripheral speed of the rotor.
  • the resultant flow is normally angular, not radial, causing a circular motion of the body of stock or water in the tank. Excessive rotational circulation will cause the stock and/or water to rise up the wall of the tank to an uncontrollable level and can create an excessive prerotation effect causing an open vortex above the rotor, allowing extensive air entrainment and general deterioration of the pulping cycle.
  • the lower of the frustoconical walls forms a first exterior angle of at least about but not more than about 30 with the horizontal.
  • a second exterior angle is that between the upper and lower frusto-conical walls and is equal to or greater than the first angle.
  • a third exterior angle is that between the upper frusto-conical sidewall and is equal to or greater than the second mentioned angle and with all of the angles being not more than about 40.
  • FIG. 1 is a fragmentary side elevational view of a tank constructed according to teachings of this invention.
  • FIG. 2 is a reduced scale version of the tank seen in FIG. 1 and with certain lettering applied thereto relating to fillet angles.
  • the numeral 10 designates generally a pulper tank which is seen to include in the central bottom a rotor generally designated 11 equipped with a plurality of laterally extending vanes or blades.
  • a rotor generally designated 11 equipped with a plurality of laterally extending vanes or blades.
  • the numeral 13 designates a generally cylindrical, upwardly extending sidewall which is connected to the bottom wall 14 by at least two intermediate, upwardly divergent, generally frustoconical walls as at 15 and 16.
  • the level of stock is designated 17 providing an axial vortex at 18 while the dotted line designated 19 shows the stationary or static level of the stock in the tank 10.
  • FIG. 2 we have shown a schematic representation of a pulper tank and have applied certain symbols to refer to various fillet angles.
  • the symbols, A, B and C are exterior fillet angles and are those referred to hereinbefore.
  • the fillet angle A is defined between the lower frusto-conical wall and the horizontal.
  • the second fillet angle B is included between the exterior of the upper frusto-conical wall and the extension of the lower frusto-conical wall.
  • the third exterior angle C is defined between the exterior of the generally cylindrical sidewall and the extension of the upper generally frusto-conical wall.
  • an interior fillet angle D which is included between the horizontal and the interior of the upper generally frusto-conical wall.
  • the sum of the angles A and B is equal to the angle D, being alternate interior angles. Still further, it will be apparent that the sum of the angles C and D is
  • the tanks generally employed in production today have an interior fillet angle D of 45 and with a lower fillet angle A of about 10 to 15.
  • the angle A should not be less than about 15.
  • increasing the angle A is beneficial so to approximate optimum results selected an angle of 20 as not creating excesssive deflection to flow from the rotor 11 but at the same time providing good drainage.
  • the first test unit approximated the prior art (as optimized) by having an interior fillet angle D of 45.
  • the other two laboratory tanks had fillet angles D of 55.
  • the second of the tanks had the fillets so arra ged that the heights of the two frusto-conical sidewalls l and 16 (as designated h, and 11 in FIG. 2) approximately equal.
  • the height I1 was approximately twice the value of 11,;
  • the tests were run using printed news material repulped to standardized condition with a consistency of 4% and 5% on the air-dried basis.
  • no angle of deflection (A, B or C) should exceed 40 and, that in the direction of flow, the relationship of the deflection angles, from lower to higher, should be equal or increasing, but never decreasing.
  • the height, 11 of the upper frusto-conical wall 16 should be at least 50% larger than the height, h of the lower frusto-conical wall 15, but not greater than In other words, the range of the ratio 11 /11 is 1.5 to 2.5.
  • a pulper tank having an upright, generally cylindrical sidewall spaced above a generally horizontal bottom wall of similar diameter than said cylindrical sidewall, a rotor mounted above said bottom wall and below said cylindrical sidewall, and at least two up.- wardly divergent generally frusto-conical walls, one above the other, coupling said bottom wall with said cylindrical sidewall, the lower of said frusto-conical walls forming a first exterior angle in the range 20 25 with the horizontal, a second exterior angle being that between the upper and lower frusto-conical walls and being at least equal to said first angle, and in the range 30 35, a third exterior angle being that between the upper frusto-conical wall and said upright cylindrical wall and being at least equal to said second angle, and in the range 30 35, the ratio of the height of said upper frusto-conical wall to the height of said lower frusto-conical wall being in the range of 2.5 to 1.5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
US371745A 1973-06-20 1973-06-20 Pulper tank Expired - Lifetime US3874600A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US371745A US3874600A (en) 1973-06-20 1973-06-20 Pulper tank
GB382574A GB1426038A (en) 1973-06-20 1974-01-28 Pulper tank
CA191,290A CA995506A (en) 1973-06-20 1974-01-30 Pulper tank
FR7403000A FR2234420B1 (ja) 1973-06-20 1974-01-30
SE7401928A SE406159B (sv) 1973-06-20 1974-02-13 Massaupplosningstank
JP49019049A JPS5248643B2 (ja) 1973-06-20 1974-02-15
DE2423222A DE2423222A1 (de) 1973-06-20 1974-05-14 Pulpertank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US371745A US3874600A (en) 1973-06-20 1973-06-20 Pulper tank

Publications (1)

Publication Number Publication Date
US3874600A true US3874600A (en) 1975-04-01

Family

ID=23465244

Family Applications (1)

Application Number Title Priority Date Filing Date
US371745A Expired - Lifetime US3874600A (en) 1973-06-20 1973-06-20 Pulper tank

Country Status (7)

Country Link
US (1) US3874600A (ja)
JP (1) JPS5248643B2 (ja)
CA (1) CA995506A (ja)
DE (1) DE2423222A1 (ja)
FR (1) FR2234420B1 (ja)
GB (1) GB1426038A (ja)
SE (1) SE406159B (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6508422B2 (en) * 2001-05-11 2003-01-21 Voith Paper, Inc. Pulper for a fiber stock preparation system
US20050224610A1 (en) * 2004-01-13 2005-10-13 Egan John J Iii Pulper rotor and assembly
US20220389656A1 (en) * 2021-06-08 2022-12-08 Kiefel Gmbh System for the processing and resupply of pulp as well as a method for the construction thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4543255B2 (ja) * 2005-02-08 2010-09-15 船井電機株式会社 電気機器キャビネット
DE102006000514A1 (de) * 2006-12-12 2008-06-19 Voith Patent Gmbh Stofflöser zur Zerkleinerung und Suspendierung von Papierstoff sowie seine Verwendung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2345474A (en) * 1941-11-19 1944-03-28 Frank J Haverland Ore mill
US3009656A (en) * 1958-06-16 1961-11-21 Black Clawson Co Paper machinery
US3085756A (en) * 1960-04-04 1963-04-16 Bolton John W & Sons Inc Apparatus and method for pulping
US3310243A (en) * 1965-01-06 1967-03-21 Design & Mfg Corp Dishwashing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2345474A (en) * 1941-11-19 1944-03-28 Frank J Haverland Ore mill
US3009656A (en) * 1958-06-16 1961-11-21 Black Clawson Co Paper machinery
US3085756A (en) * 1960-04-04 1963-04-16 Bolton John W & Sons Inc Apparatus and method for pulping
US3310243A (en) * 1965-01-06 1967-03-21 Design & Mfg Corp Dishwashing machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6508422B2 (en) * 2001-05-11 2003-01-21 Voith Paper, Inc. Pulper for a fiber stock preparation system
US20050224610A1 (en) * 2004-01-13 2005-10-13 Egan John J Iii Pulper rotor and assembly
US20220389656A1 (en) * 2021-06-08 2022-12-08 Kiefel Gmbh System for the processing and resupply of pulp as well as a method for the construction thereof

Also Published As

Publication number Publication date
DE2423222A1 (de) 1975-01-16
JPS5248643B2 (ja) 1977-12-12
CA995506A (en) 1976-08-24
FR2234420A1 (ja) 1975-01-17
SE406159B (sv) 1979-01-29
JPS5022315A (ja) 1975-03-10
GB1426038A (en) 1976-02-25
SE7401928L (ja) 1974-12-23
FR2234420B1 (ja) 1977-06-10

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