Patent US3884750A successfully refreshed from Google Patents.
US3884750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering separate fiber fractions from corrugated board
Assignee: Arthur D Little Inc
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Filing: 1974-07-05
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Granted: 1975-05-20
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Expires: 1994-07-05
Abstract
Abstract Method for separating the fiber fraction forming the corrugated medium, having low moisture resistance or high water receptivity, from the fiber fraction forming the linerboard, having high moisture resistance or low water receptivity of corrugated board stock. The stock in a dry state is reduced first to intermediatesized pieces. Subsequently, the pieces are dispersed in water. The temperature of the water, the use of additives, the energy level input and time of dispersion are adjusted to reduce the corrugated medium to small pieces or fibers while retaining the liner board as an essentially intact fraction. The two fractions are then physically separated and recovered.
Inventors
- 👤 Fred D Iannazzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:13
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/02; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/30; D21B1/32; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
158 words
A method for separating the semichemical fiber fraction forming the corrugated medium from the kraft fiber fraction forming the linerboard in corrugated board, comprising the steps of a. reducing corrugated board stock to intermediate-sized pieces no larger than about six inches in any one dimension; b. introduCing said intermediate-sized pieces of corrugated stock into water for dispersion therein; c. subjecting said corrugated stock in water to differential size reduction by mechanical action, the temperature of said water and the length of time and energy level input of said mechanical action being adjusted to separate said corrugated medium from said linerboard and to reduce said corrugated medium fraction to fibers or small pieces no larger than about three-eights inch in any one dimension while retaining substantially all of the kraft linerboard fraction in the form of larger or intermediate-sized pieces; and d. separating said fibers and small pieces of said semichemical corrugated medium fraction from said kraft linerboard fraction.
Claim 2
Independent Claim
158 words
A method for separating the semichemical fiber fraction forming the corrugated medium from the kraft fiber fraction forming the linerboard in corrugated board, comprising the steps of a. reducing corrugated board stock to intermediate-sized pieces no larger than about six inches in any one dimension; b. introduCing said intermediate-sized pieces of corrugated stock into water for dispersion therein; c. subjecting said corrugated stock in water to differential size reduction by mechanical action, the temperature of said water and the length of time and energy level input of said mechanical action being adjusted to separate said corrugated medium from said linerboard and to reduce said corrugated medium fraction to fibers or small pieces no larger than about three-eights inch in any one dimension while retaining substantially all of the kraft linerboard fraction in the form of larger or intermediate-sized pieces; and d. separating said fibers and small pieces of said semichemical corrugated medium fraction from said kraft linerboard fraction.
Claim 3
Dependent Claim
31 words
A method in accordance with claim 1 including the step of adding a debonding agent to said corrugated board stock prior to said reducing step (a) thereby to minimize fiber breaking.
Claim 4
Dependent Claim
37 words
A method in accordance with claim 1 including the step of adding a surfactant to said water prior to step (b), the concentration of said surfactant being up to about 0.3 percent by weight of said water.
Claim 5
Dependent Claim
30 words
A method in accordance with claim 1 wherein said corrugated board stock is reduced in size to form said intermeidate-sized pieces with dimensions ranging between about 1 and 6 inches.
Claim 6
Dependent Claim
31 words
A method in accordance with claim 1 wherein the amount of said corrugated board stock added to said water ranges between about 1 and 10 percent by weight of said water.
Claim 7
Dependent Claim
25 words
A method in accordance with claim 1 wherein the temperature of said water used to form said dispersion ranges between ambient temperature and about 160*F.
Claim 8
Dependent Claim
27 words
A method in accordance with claim 1 wherein said mechanical action is carried out over a period of time ranging from a few seconds to several minutes.
Claim 9
Dependent Claim
29 words
A method in accordance with claim 1 wherein said separating comprises collecting said kraft linerboard fraction on a screen sized to permit said corrugated medium fraction to pass therethrough.
Claim 10
Independent Claim
213 words
A method for separating the semichemical fiber fraction forming the corrugated medium from the kraft fiber fraction forming the linerboard in corrugated board, comprising the steps of a. reducing corrugated board stock to intermediate-sized pieces having dimensions ranging between about 1 and 6 inches; b. introducing said intermediate-sized pieces of corrugated stock into water for dispersion therein, said water containing up to about 0.3 percent by weight of a surfactant and being at a temperature between ambient temperature and 160*F, the amount of said corrugated board stock added to said water ranging between about 1 and 10 percent by weight of said water; c. subjecting said corrugated stock in water to differential size reduction by mechanical action, the temperature of said water, the amount of said surfactant, the dimensions of said corrugated stock pieces, and the length of time and energy level input of said mechanical action being adjusted to separate said corrugated medium from said linerboard and to reduce said corrugated medium fraction to fibers or small pices, no greater than about 3/8 inch in size while retaining substantially all of the kraft linerboard fraction in the form of larger or intermediate-sized pieces; and d. separating said fibers and small pieces of said semichemical corrugated medium fraction from said kraft linerboard fraction.
Claim 11
Independent Claim
213 words
A method for separating the semichemical fiber fraction forming the corrugated medium from the kraft fiber fraction forming the linerboard in corrugated board, comprising the steps of a. reducing corrugated board stock to intermediate-sized pieces having dimensions ranging between about 1 and 6 inches; b. introducing said intermediate-sized pieces of corrugated stock into water for dispersion therein, said water containing up to about 0.3 percent by weight of a surfactant and being at a temperature between ambient temperature and 160*F, the amount of said corrugated board stock added to said water ranging between about 1 and 10 percent by weight of said water; c. subjecting said corrugated stock in water to differential size reduction by mechanical action, the temperature of said water, the amount of said surfactant, the dimensions of said corrugated stock pieces, and the length of time and energy level input of said mechanical action being adjusted to separate said corrugated medium from said linerboard and to reduce said corrugated medium fraction to fibers or small pices, no greater than about 3/8 inch in size while retaining substantially all of the kraft linerboard fraction in the form of larger or intermediate-sized pieces; and d. separating said fibers and small pieces of said semichemical corrugated medium fraction from said kraft linerboard fraction.
Claim 12
Dependent Claim
31 words
A method in accordance with claim 9 including the step of adding a debonding agent to said corrugated board stock prior to said reducing step (a) thereby to minimize fiber breaking.
Claim 13
Dependent Claim
27 words
A method in accordance with claim 9 wherein said mechanical action is carried out over a period of time ranging from a few seconds to several minutes.
Claim 14
Independent Claim
183 words
A method for separating the semichemical fiber fraction forming the corrugated medium from the kraft fiber fraction forming the linerboard in corrugated bOard for recycling into paper products, comprising the steps of a. reducing corrugated board stock to intermediate-sized pieces no larger than about six inches in any one dimension; b. introducing said intermediate-sized pieces of corrugated stock into water for dispersion therein; c. subjecting said corrugated stock in water to different size reduction by mechanical action, the temperature of said water and the length of time and energy level input of said mechanical action being adjusted to separate said corrugated medium from said linerboard and to reduce said corrugated medium fraction to fibers or small pieces no larger than about three-eights inch in any one dimension while retaining substantially all of the kraft linerboard fraction in the form of larger or intermediate sized pieces; d. separating said fibers and small pieces of said semichemical corrugated medium fraction from said kraft linerboard fraction; and e. separately dispersing said semichemical corrugated medium and said kraft linerboard fractions in water to form separate papermaking furnishes.
Claim 15
Independent Claim
183 words
A method for separating the semichemical fiber fraction forming the corrugated medium from the kraft fiber fraction forming the linerboard in corrugated bOard for recycling into paper products, comprising the steps of a. reducing corrugated board stock to intermediate-sized pieces no larger than about six inches in any one dimension; b. introducing said intermediate-sized pieces of corrugated stock into water for dispersion therein; c. subjecting said corrugated stock in water to different size reduction by mechanical action, the temperature of said water and the length of time and energy level input of said mechanical action being adjusted to separate said corrugated medium from said linerboard and to reduce said corrugated medium fraction to fibers or small pieces no larger than about three-eights inch in any one dimension while retaining substantially all of the kraft linerboard fraction in the form of larger or intermediate sized pieces; d. separating said fibers and small pieces of said semichemical corrugated medium fraction from said kraft linerboard fraction; and e. separately dispersing said semichemical corrugated medium and said kraft linerboard fractions in water to form separate papermaking furnishes.
Claim 16
Dependent Claim
31 words
A method in accordance with claim 12 including the step of adding a debonding agent to said corrugated board stock prior to said reducing step (a) thereby to minimize fiber breaking.
Claim 17
Dependent Claim
37 words
A method in accordance with claim 12 including the step of adding a surfactant to said water prior to step (b), the concentration of said surfactant being up to about 0.3 percent by weight of said water.
Claim 18
Dependent Claim
30 words
A method in accordance with claim 12 wherein said corrugated board stock is reduced in size to form said intermediate-sized pieces with dimensions ranging between about 1 and 6 inches.
Claim 19
Dependent Claim
31 words
A method in accordance with claim 12 wherein the amount of said corrugated board stock added to said water ranges between about 1 and 10 percent by weight of said water.
Claim 20
Dependent Claim
25 words
A method in accordance with claim 12 wherein the temperature of said water used to form said dispersion ranges between ambient temperature and about 160*F.
Claim 21
Dependent Claim
32 words
A method in accordance with claim 12 including the further step of forming from said papermaking furnishes reconstituted papers suitable for corrugated medium and for linerboard in the manufacture of corrugated board.
Claim 22
Independent Claim
158 words
A METHOD FOR SEPARATING THE FIBER FRACTION FORMING THE CORRUGATED MEDIUM, HAVING LOW MOISTURE RESISTANCE OR HIGH WATER RECEPTIVITY, FROM THE FIBER FRACTION FORMING THE LINERBOARD, HAVING HIGH MOISTURE RESISTANCE, OR LOW WATER RECEPTIVITY, IN CORRUGATED BOARD, COMPRISING THE STEPS OF A. REDUCING CORRUGATED BOARD STOCK TO INTERMEDIATE PIECES NO LARGER THAN ABOUT SIX INCHES IN ANY ONE DIMENSION; B. INTRODUCING SAIDINTERMEDIATE-SIZE PIECES OF CORRUGATED STOCK INTO WATER FOR DISPERSION THEREIN; C. SUBJECTING SAID CORRUGATED STOCK IN WATER TO DIFFERENTIAL SIZE REDUCTION BY MECHANICAL ACTION, THE TEMPERATURE OF SAID WATER AND THE LENGTH OF TIME AND ENERGY LEVEL INPUT OF SAID MECHANICAL ACTION BEING ADJUSTED TO SEPARATE SAID CORRUGATED MEDIUM FRACTION TO FIBEERS OR SMALL PIECES NO LARGER THAN ABOUT THREE-EIGHTS INCH IN ANY ONE DIMENSION WHILE RETAINING SUBSTANTIALLY ALL OF THELINERBOARD FRACTION IN THE FORM OF LARGER OR INTERMEDIATE-SIZE PIECES; AND D. SEPARATINNG SAID FIBERS AND SMALL PIECES OF SAID CORRUGATED MEDIUM FRACTION FROM SAID LINERBOARD FRACTION.
Claim 23
Independent Claim
158 words
A METHOD FOR SEPARATING THE FIBER FRACTION FORMING THE CORRUGATED MEDIUM, HAVING LOW MOISTURE RESISTANCE OR HIGH WATER RECEPTIVITY, FROM THE FIBER FRACTION FORMING THE LINERBOARD, HAVING HIGH MOISTURE RESISTANCE, OR LOW WATER RECEPTIVITY, IN CORRUGATED BOARD, COMPRISING THE STEPS OF A. REDUCING CORRUGATED BOARD STOCK TO INTERMEDIATE PIECES NO LARGER THAN ABOUT SIX INCHES IN ANY ONE DIMENSION; B. INTRODUCING SAIDINTERMEDIATE-SIZE PIECES OF CORRUGATED STOCK INTO WATER FOR DISPERSION THEREIN; C. SUBJECTING SAID CORRUGATED STOCK IN WATER TO DIFFERENTIAL SIZE REDUCTION BY MECHANICAL ACTION, THE TEMPERATURE OF SAID WATER AND THE LENGTH OF TIME AND ENERGY LEVEL INPUT OF SAID MECHANICAL ACTION BEING ADJUSTED TO SEPARATE SAID CORRUGATED MEDIUM FRACTION TO FIBEERS OR SMALL PIECES NO LARGER THAN ABOUT THREE-EIGHTS INCH IN ANY ONE DIMENSION WHILE RETAINING SUBSTANTIALLY ALL OF THELINERBOARD FRACTION IN THE FORM OF LARGER OR INTERMEDIATE-SIZE PIECES; AND D. SEPARATINNG SAID FIBERS AND SMALL PIECES OF SAID CORRUGATED MEDIUM FRACTION FROM SAID LINERBOARD FRACTION.
Claim 24
Independent Claim
192 words
A method for separating the fiber fraction forming the corrugated medium, having low moisture resistance or high water receptivity, from the fiber fraction forming the linerboard, having high moisture resistance or low water receptivity, in corrugated board for recycling into paper products, comprising the steps of a. reducing corrugated board stock to intermediate-sized pieces no larger than about six inches in any one dimension; b. introducing said intermediate-sized pieces of corrugated stock into water for dispersion therein; c. subjecting said corrugated stock in water to differential size reduction by mechanical action, the temperature of said water and the length of time and energy level input of said mechanical action being adjusted to separate said corrugated medium from said linerboard and to reduce said corrugated medium fraction to fibers or small pieces no larger than about three-eighths inch in any one dimension while retaining substantially all of the linerboard fraction in the form of larger or intermediate sized pieces; d. separating said fibers and small pieces of said corrugated medium fraction from said linerboard fraction; and e. separately dispersing said corrugated medium and said linerboard fractions in water to form separate papermaking furnishes.
Claim 25
Independent Claim
192 words
A method for separating the fiber fraction forming the corrugated medium, having low moisture resistance or high water receptivity, from the fiber fraction forming the linerboard, having high moisture resistance or low water receptivity, in corrugated board for recycling into paper products, comprising the steps of a. reducing corrugated board stock to intermediate-sized pieces no larger than about six inches in any one dimension; b. introducing said intermediate-sized pieces of corrugated stock into water for dispersion therein; c. subjecting said corrugated stock in water to differential size reduction by mechanical action, the temperature of said water and the length of time and energy level input of said mechanical action being adjusted to separate said corrugated medium from said linerboard and to reduce said corrugated medium fraction to fibers or small pieces no larger than about three-eighths inch in any one dimension while retaining substantially all of the linerboard fraction in the form of larger or intermediate sized pieces; d. separating said fibers and small pieces of said corrugated medium fraction from said linerboard fraction; and e. separately dispersing said corrugated medium and said linerboard fractions in water to form separate papermaking furnishes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |