US3352745A - Process of separating fibrous pulp into springwood and summerwood fibers by centrifuging - Google Patents
Process of separating fibrous pulp into springwood and summerwood fibers by centrifuging Download PDFInfo
- Publication number
- US3352745A US3352745A US91890A US9189061A US3352745A US 3352745 A US3352745 A US 3352745A US 91890 A US91890 A US 91890A US 9189061 A US9189061 A US 9189061A US 3352745 A US3352745 A US 3352745A
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- US
- United States
- Prior art keywords
- pulp
- fibers
- pulps
- springwood
- separation
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- 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
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- 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
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
Definitions
- the present invention relates to a method of treating fibrous pulp suspensions, containing fibers of different kinds, preferentially suspensions of cellulose pulp containing springwood fibers and summerwood fibers (unbleached, semibleached or all-bleached), in such a manner as will cause the fibers contained in the suspensions to become separated from each other in conformity with p the inherent characters of the fibers.
- connection fibers of different kinds means such fibers as differ from each other in respect of their morphologic structure and/or specific gravity, specific surface as well as chemical and/or physical properties and which, because of this, when further refined to paper products and/or to packing products and, respectively, to textile fibers, to chemical products etcetera yield different results in respect of the quality and properties of the final product.
- Examples hereof are the abovementioned springwood fibers and summerwood fibers.
- the purpose of the separation is to produce, as desired, merely from the obtained fiber fractions or from fractions mixed with each other and/ or mixed with other fractions or pulps, pulps having, for example, different paper-technical properties and, respectively, different derivative-technical properties.
- the fibrous pulp suspension to be treated is subjected to the action of centrifugal force or centrifugal force in combination with a pumping force and/ or the force of gravity within at least one chamber of treatment connected to a source of suction and/or a source of pressure, for example, a centrifugal or vortex separator, a so-called centricleaner, the various fractions resulting from the separation treatment being then led away from said chamber of treatment in order to constitute, or to be added to, the pulp in which each respective fraction is to be included, after the fibers of such fractions having, if desired, first been, wholly or partly, subjected to further separation and/or mixing with other fractions or pulps.
- a source of suction and/or a source of pressure for example, a centrifugal or vortex separator, a so-called centricleaner
- the chambers of treatment may then be connected in parallel and/or in seriesdirectly and/or in accordance with the principle of so-called cascade connection.
- the concentration of the fibrous pulp amounts to 0.005-2 percent, preferably to 0.011.6 percent, and preferentially to 0.05-1.3 percent, and the temperature amounts to 0-70 C., preferably to 0-60 C., and preferentially to 1-50 C.
- the pumping pressure at the inlet end of the chamber of treatment amounts to 02-15 kgs./sq. cm., preferably to 03-12 kgs./sq. cm., and preferentially to 1-8 kgs./sq.,
- the counter-pressure is 0.0- kgs./ sq. cm., prefer- 3,352,745 Patented Nov. 14, 1957 ably 0.0-5 kgs./sq. cm., and preferentially 0.0-2 kgs./sq. cm.
- the pH-value of the pulp suspension amounts to 1-13, preferably to 2-12, and preferentially to 3-10.
- the quantitative proportions of the pulps obtained by the separationthe so-called separated pulps are adapted to, inter alia, the quantitative proportions and the properties of the components contained in the pulp to be treated-the so-called original pulpand., respectively, to the properties that the separated pulp should have.
- the invention makes it possible to separate fibers having different structures and/or properties and compositions, respectively, such as the abovementioned springwood fibers and summerwood fibers. Since, as is well known, fibers of different types-inter alia springwood fibers and summerwood fibers-yield papers of different types it is, thus, possible in accordance with the invention, to produce, as desired, from an original pulp of a normal or of a special type, containing different fiber components, two or more pulps having different properties.
- FIG. 1 is a schematic illustration of a one step separation in a vertix separator of so-called centricleaner
- FIG. 2 is a schematic illustration of a two step separation.
- FIG. 1 is a typical known conical vortex separator or so-called centricleaner having a tangential inlet 2 for the pulp to be treated, an outlet 3 for the lighter fraction designated pulp 1 and an outlet 4 for the heavier fraction designated pulp II.
- the lighter fraction leaving the centricleaner 1 through the outlet 3 Le. pulp I is delivered into a second centricleaner 1a in which it is again divided into lighter and heavier fractions designated pulps III and V which leave the centricleaner 1a through the outlets 5 and 6 respectively.
- the heavier fraction leaving the centricleaner 1 through the outlet 4 i.e. pulp II is delivered to a third centricleaner 1b in which this fraction is separated into lighter and heavier fractions designated pulps IV and VI which leave the centricleaner 1b through the outlets 7 and 8 respectively.
- Example 1 Separation, in one step, of fibers in unbleached pine sulphate pulp The separation was carried out in one step in a number of vortex separators, so-called centricleaners, at a pulp concentration of about 0.25 percent.
- the pump pressure of the entering pulp suspension was 3 kgs./sq. cm. with a counterpressure of the leaving pulp suspension amounting to about 0.1 kg./sq. cm.
- the pH-value of the pulp suspension amounted to 6.5.
- the temperature was +20 C.
- Example 2 Separatin, in one step of fibers in bleached pine sulphatepnlp The separation was carried out in the same way as in Example 1.
- the analytical dataof the pulps will appear from Table 2 (below). Said table shows that by the separation the original pulp has been divided into two fractions possessing entirely different properties.
- a suitable way of proceeding is as follows:
- Example 3 S eparation, in two steps, of fibers in unbleached pine sulphate pulp The separation was carried out in two steps in accordance with the diagram of connections appearing from the accompanying FIGURE 2 of the drawing.
- the concentration of the pulp at the test amounted to 0.3 percent and the temperature amounted to +16 C.
- the pump pressure of the entering pulp suspension was 3 kgs./sq. cm. and the counterpressure of the leaving pulp suspension amounted to about 0.1 kg./sq.-cm.-
- the pH-value of the suspension was 6.9.
- the analytical data of the pulps are found in Table 3 (below), which shows that the connections used'in this case resulted in pulps of entirely different characters.
- pulps I, III and V are exceptions, said pulps being rather of the same character. Consequently, in the present case it is possible to restrict oneself to first separating the original pulp into pulps I and II, pulp II being then separated into pulps'IV and VI. Said pulps, IV and VI, may then in their turn be separated in a suitable manner, according to the desiderata existing in respect of the number of qualities and, respectively, the properties of the qualities. Pulp IV and fractions thereof in the. accepted fractions as Well as in the rejected fractions preferably may be screened and/or treated in a vortex separator.
- Example 4 -Separation, in one step, of fibers in unbleached birch sulphate pulp
- the original pulp was treated under, the same conditions as in Example 1.
- the analytical data of the pulps will appear from Table 4 (below), which shows that the pulps obtained by the separation-are rather similar to each other and also similar to the original pulp except in respect of the porosity and the volume-weight of the paper made thereof.
- Example 5 Separatation, in one step, of fibers in unbleached spruce snlp/zile pulp The separation was carried out under conditions similar to those in Example 1. The analytical data of the pulps are to be found in Table 5 (below), from which it will appear that the original pulp has been separated into two pulps having different paper-technical properties.
- the socalled centricleaners used for the separation, may be connected in parallel and/or in series-directly and/or according to the principle of so-called cascade connection.
- fiber meter weight means the weight in milligrams of 1 meter length of fibers placed and to emit TABLE 3.DATA OF ANALYSIS OF THE ORIGINAL PULP AND OF THE SEPARATED PULPS, RESPECTIVELY (UNBLEACH- ED PINE SULPI-IATE PULP) Valley beating Pulp Degree of Time of Breaking Burst Tear Folding Prosity, Absorp- Volume beating, beating, length, factor factor number sec./l n11. tion, mm. weight,
- Pulp I 15.0 0 5. 4 30 3 67 0.61 25 14 9. 2 60 75 800 32 35 0. 74
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE2033/60A SE304167B (xx) | 1960-02-29 | 1960-02-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3352745A true US3352745A (en) | 1967-11-14 |
Family
ID=20259270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US91890A Expired - Lifetime US3352745A (en) | 1960-02-29 | 1961-02-27 | Process of separating fibrous pulp into springwood and summerwood fibers by centrifuging |
Country Status (3)
Country | Link |
---|---|
US (1) | US3352745A (xx) |
DE (1) | DE1292486B (xx) |
SE (1) | SE304167B (xx) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3472371A (en) * | 1966-10-04 | 1969-10-14 | Ronald Percy Ayerst | Sorting fibrous material |
US3486619A (en) * | 1968-01-24 | 1969-12-30 | Wikdahl Nils Anders Lennart | Method of removing impurities from a fiber suspension |
US3830688A (en) * | 1970-10-23 | 1974-08-20 | Skogsaegarnas Ind Ab | Method of reducing the discharge of waste products from pulp mills |
US3884750A (en) * | 1972-09-25 | 1975-05-20 | Little Inc A | Method of recovering separate fiber fractions from corrugated board |
US3912579A (en) * | 1969-06-04 | 1975-10-14 | Bergstrom Paper Co | Reverse cleaning and de-inking of paper stock |
US4135389A (en) * | 1977-06-06 | 1979-01-23 | Domtar Inc. | Specific surface fractionator |
US4292122A (en) * | 1976-12-06 | 1981-09-29 | Domtar Inc. | Bonding properties of mechanical pulps |
US4985119A (en) * | 1987-07-01 | 1991-01-15 | The Procter & Gamble Cellulose Company | Cellulose fiber-reinforced structure |
US5228954A (en) * | 1991-05-28 | 1993-07-20 | The Procter & Gamble Cellulose Company | Cellulose pulps of selected morphology for improved paper strength potential |
US5405499A (en) * | 1993-06-24 | 1995-04-11 | The Procter & Gamble Company | Cellulose pulps having improved softness potential |
US5679218A (en) * | 1994-07-29 | 1997-10-21 | The Procter & Gamble Company | Tissue paper containing chemically softened coarse cellulose fibers |
WO2007063182A3 (en) * | 2005-12-01 | 2007-08-02 | Metso Paper Inc | Method for manufacturing paper |
US20080029232A1 (en) * | 2004-09-21 | 2008-02-07 | Noss Ab | Process and Device to Manufacture Cellulose Pulp |
US20080230458A1 (en) * | 2007-03-19 | 2008-09-25 | Palo Alto Research Center Incorporated. | Vortex structure for high throughput continuous flow separation |
US20120097616A1 (en) * | 2009-07-03 | 2012-04-26 | Jan Backman | Hydrocyclone, system and method for cleaning cellulose suspensions |
US8747679B2 (en) * | 2008-01-22 | 2014-06-10 | Caltec Limited | Separation system and method for separating a fluid mixture with this separating system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL76122C (xx) * | ||||
US2377524A (en) * | 1939-11-21 | 1945-06-05 | Hammermill Paper Co | Method of and means for separating solid particles in pulp suspensions and the like |
US2767624A (en) * | 1950-07-30 | 1956-10-23 | Dorries A G Vorm Maschinenfabr | Tubular hydroextractor for the purifying of suspensions, especially suspensions containing fibrous material |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL43368C (xx) * | 1935-03-22 | |||
BE426877A (xx) * | 1936-03-11 | |||
DE666817C (de) * | 1937-07-11 | 1938-10-28 | Andre Berges | Vorrichtung zum ununterbrochenen Reinigen und Sichten, insbesondere von Papierstoff |
BE503581A (xx) * | 1950-05-30 |
-
1960
- 1960-02-29 SE SE2033/60A patent/SE304167B/xx unknown
-
1961
- 1961-02-27 DE DES72738A patent/DE1292486B/de active Pending
- 1961-02-27 US US91890A patent/US3352745A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL76122C (xx) * | ||||
US2377524A (en) * | 1939-11-21 | 1945-06-05 | Hammermill Paper Co | Method of and means for separating solid particles in pulp suspensions and the like |
US2767624A (en) * | 1950-07-30 | 1956-10-23 | Dorries A G Vorm Maschinenfabr | Tubular hydroextractor for the purifying of suspensions, especially suspensions containing fibrous material |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3472371A (en) * | 1966-10-04 | 1969-10-14 | Ronald Percy Ayerst | Sorting fibrous material |
US3486619A (en) * | 1968-01-24 | 1969-12-30 | Wikdahl Nils Anders Lennart | Method of removing impurities from a fiber suspension |
US3912579A (en) * | 1969-06-04 | 1975-10-14 | Bergstrom Paper Co | Reverse cleaning and de-inking of paper stock |
US3830688A (en) * | 1970-10-23 | 1974-08-20 | Skogsaegarnas Ind Ab | Method of reducing the discharge of waste products from pulp mills |
US3884750A (en) * | 1972-09-25 | 1975-05-20 | Little Inc A | Method of recovering separate fiber fractions from corrugated board |
US4292122A (en) * | 1976-12-06 | 1981-09-29 | Domtar Inc. | Bonding properties of mechanical pulps |
US4135389A (en) * | 1977-06-06 | 1979-01-23 | Domtar Inc. | Specific surface fractionator |
US4985119A (en) * | 1987-07-01 | 1991-01-15 | The Procter & Gamble Cellulose Company | Cellulose fiber-reinforced structure |
US5228954A (en) * | 1991-05-28 | 1993-07-20 | The Procter & Gamble Cellulose Company | Cellulose pulps of selected morphology for improved paper strength potential |
US5582685A (en) * | 1993-06-24 | 1996-12-10 | The Procter & Gamble Company | Method for producing a cellulose pulp of selected fiber length and coarseness by a two-stage fractionation |
US5405499A (en) * | 1993-06-24 | 1995-04-11 | The Procter & Gamble Company | Cellulose pulps having improved softness potential |
US5679218A (en) * | 1994-07-29 | 1997-10-21 | The Procter & Gamble Company | Tissue paper containing chemically softened coarse cellulose fibers |
US20080029232A1 (en) * | 2004-09-21 | 2008-02-07 | Noss Ab | Process and Device to Manufacture Cellulose Pulp |
WO2007063182A3 (en) * | 2005-12-01 | 2007-08-02 | Metso Paper Inc | Method for manufacturing paper |
US20080230458A1 (en) * | 2007-03-19 | 2008-09-25 | Palo Alto Research Center Incorporated. | Vortex structure for high throughput continuous flow separation |
US8875903B2 (en) * | 2007-03-19 | 2014-11-04 | Palo Alto Research Center Incorporated | Vortex structure for high throughput continuous flow separation |
US8747679B2 (en) * | 2008-01-22 | 2014-06-10 | Caltec Limited | Separation system and method for separating a fluid mixture with this separating system |
US20120097616A1 (en) * | 2009-07-03 | 2012-04-26 | Jan Backman | Hydrocyclone, system and method for cleaning cellulose suspensions |
US20150259853A1 (en) * | 2009-07-03 | 2015-09-17 | Jan Backman | Method for cleaning cellulose suspensions |
US9238888B2 (en) * | 2009-07-03 | 2016-01-19 | GL&V Luxembourg S.à r.l. | Method for cleaning cellulose suspensions |
Also Published As
Publication number | Publication date |
---|---|
DE1292486B (de) | 1969-04-10 |
SE304167B (xx) | 1968-09-16 |
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