US20250109554A1 - Method for post-processing of a product, especially paper or paperboard, which has been fabricated from pulp containing lignin - Google Patents

Method for post-processing of a product, especially paper or paperboard, which has been fabricated from pulp containing lignin Download PDF

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Publication number
US20250109554A1
US20250109554A1 US18/729,079 US202218729079A US2025109554A1 US 20250109554 A1 US20250109554 A1 US 20250109554A1 US 202218729079 A US202218729079 A US 202218729079A US 2025109554 A1 US2025109554 A1 US 2025109554A1
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US
United States
Prior art keywords
belt
product
pressure
gap
roller
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.)
Pending
Application number
US18/729,079
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English (en)
Inventor
Cherryleen Garcia-Lindgren
Hans-Kurt Schromm
Dina Thamir
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.)
IPCO Germany GmbH
Original Assignee
IPCO Germany GmbH
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 IPCO Germany GmbH filed Critical IPCO Germany GmbH
Assigned to IPCO GERMANY GMBH reassignment IPCO GERMANY GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHROMM, HANS-KURT, THAMIR, Dina, GARCIA-LINDGREN, CHERRYLEEN
Publication of US20250109554A1 publication Critical patent/US20250109554A1/en
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/005—Mechanical treatment
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating

Definitions

  • the invention refers to a method for post-processing of a product, especially paper or paperboard, which has been fabricated from pulp containing lignin.
  • a method for post-processing of a product, especially paper or paperboard, which has been fabricated at least partly from pulp containing lignin comprises the following steps: introducing the product into a product gap of a belt press having at least one belt, heating up the product within the belt press to a temperature between 160° C. and 350° C. and submitting the product within the band press to a line pressure between 30 N/mm and 200 N/mm and/or a surface pressure between 50 kN/m 2 (0.5 bar) and 600 kN/m 2 (6 bar), especially between 200 kN/m 2 (2 bar) and 600 kN/m 2 (6 bar).
  • the moisture resistance of a product, especially paper or paperboard, which has been fabricated from pulp containing lignin as well as the mechanical strength of the product can be improved.
  • the product is at least partly fabricated from pulp containing lignin, which means that at least a component or at least a layer of the product is made from pulp containing lignin.
  • the pulp contains lignin and usually also contains fibrous material.
  • the pulp is preferably at least partly made from wood or from plants containing lignin.
  • the product is especially a flat product, like paper or paperboard.
  • Dry strength and wet strength can be increased. Dry strength can be measured by tensile index and SCT index (Short-Crush-Test). Wet strength can be measured by wet tensile index. Especially the wet strength of a product, especially paper or paperboard, is greatly increased by the inventive method, e.g. by a factor of 10, whereas dry strength is e.g. doubled. It should be noted that all the lignin is already contained in the product.
  • Additional lignin can be added during the inventive method e.g. by applying a liquid or a powder containing lignin to the product. This can be done by spraying or scattering, respectively.
  • the inventive method can be carried out in a very economical and fast way.
  • the inventive method is not supposed to form an in-line solution, i.e. the inventive method is not intended to be carried out downstream of or within a paper machine. Rather, the inventive method is intended to be carried out off-line, e.g. in the form of a roll-to-roll-method.
  • the product is heated up to a temperature between 160° C. and 350° C. It is to be understood that the scope of the invention covers all temperatures within that range.
  • the exact temperature or the exact temperature range which is to be used depends on the kind of paper and especially the pulp the product has been fabricated from. Simple tests with respect to an optimal temperature or temperature range can be carried out for a special given product.
  • the product within the band press is submitted to a line pressure between 30 N/mm and 200 N/mm and/or a surface pressure between 50 kN/m 2 and 600 kN/m 2 .
  • the scope of the invention covers all line pressures and surface pressures within the respective given range.
  • the optimal line pressure and optimal surface pressure depends on the kind of product to be post-processed, especially from the kind of pulp the product has been fabricated from. Simple tests can be carried out to determine an optimal line pressure and/or an optimal surface pressure for the special product to be post-processed within the given boundaries for the line pressure and the surface pressure.
  • the step of moistening or drying the product in order that the product has a moisture content of 2% to 40%, especially 10% to 40% is carried out before introducing the product into the product gap.
  • the at least one belt is a steel belt or a plastic belt.
  • the product to be post-processed can be reliably guided through the belt press and temperature as well as pressure can be applied to the product in a reproducible way.
  • the belt can comprise Teflon, is made of Teflon or is coated with Teflon.
  • the belt can be polished or provided with a desired surface roughness.
  • the belt press is a double belt press having at least an upper belt and a lower belt, wherein heating up the product and submitting the product to pressure takes place in the product gap between the at least one upper belt and the at least one lower belt of the double belt press.
  • Double belt presses are especially well suited for post-processing of flat products, especially paper.
  • the product is safely guided within the product gap between the belts and pressure as well as temperature can be applied to the product.
  • the double belt press can comprise two or more steel belts forming at least a portion of the product gap in-between them, two or more plastic belts forming at least a portion of the product gap in-between them and/or at least one steel belt and at least one plastic belt forming at least a portion of the product gap in-between them.
  • All upper belts and all lower belts are endless belts and are guided around at least two drums. The drums may be driven or may rotate freely and the drums may be heated or cooled. Also the belts may be heated or cooled.
  • two plastic belts form at least a portion of the product gap in-between them and on the backside of at least one of the plastic belts a steel belt runs parallel to the plastic belt for at least a portion of the product gap.
  • Plastic belts can be provided with a non-stick surface, e.g. Teflon. Further, plastic belts are in general cheaper and easier to manufacture compared to steel belts. Steel belts on the other hand can be used to apply a higher pressure compared to plastic belts as well as realizing higher heat flows into the paper to be post-processed. Further, the heat capacity of a steel belt is much higher compared to a plastic belt. Heat losses can, thereby, be minimized when a steel belt is used to introduce a heat flow into the paper to be post-processed. According to a development of the invention an upper belt of the double belt press is perforated.
  • vapour or steam can escape from the product gap. This may be important and advantageous, since the product is heated and moisture contained in the product evaporates within the product gap.
  • a perforated belt gives the possibility for steam or vapour to leave the product gap without negatively influencing the product quality. Even so pressure can still be applied by means of the perforated belt. Thereby, a high and constant product quality can be ensured.
  • the double belt press comprises a first upper belt and a second upper belt, the first upper belt being arranged upstream of the second upper belt when seen in a transport direction of the double belt press in the product gap.
  • first upper belt and a second upper belt By means of a first upper belt and a second upper belt the product to be post-processed can be pressed and heated and, at the same time, vapour and steam which is produced within the product gap by heating the product, can escape through the gap between the first upper belt and the second upper belt. Also, the pressure is relieved in the gap between the first upper belt and the second upper belt and then applied again by the second upper belt, which can also be advantageous in the inventive method.
  • Such vapor or steam arises from the moisture contained in the product and the following heating of the product within the product gap. By enabling the vapor or steam to escape, a very good and constant product quality can be ensured.
  • two or more separate upper belts can be provided when seen in a transport direction of the paper through the product gap, between each pair of adjacent upper belts, a gap of the product gap being provided to enable vapor or steam to escape from the product gap.
  • the pressure is applied by means of at least one pressure roller, circulating rollers, at least one S-roller, at least one counterpressure roller and/or at least one counterpressure belt.
  • Pressure rollers, circulating rollers, S-rollers, counterpressure rollers and/or counterpressure belts can be advantageously combined with a belt press.
  • combinations of pressure rollers, circulating rollers, S-rollers, counterpressure rollers and/or counterpressure belts are possible.
  • the optimal combination is determined upon the pressure the product is to be submitted to, namely a line pressure or a surface pressure as well as the amount of pressure or the pressure range to which the product is to be submitted.
  • the pressure is applied by means of at least one pressure roller, circulating rollers, at least one S-roller, at least one counterpressure roller and/or at least one counterpressure belt directly to the product.
  • the at least one pressure roller, the circulating rollers, the at least one S-roller, the at least one counterpressure roller and/or the at least one counterpressure belt touches a backside of the at least one belt, the backside of the belt facing away from the product to be post-processed.
  • the pressure is, thereby, indirectly applied to the product. This can be advantageous.
  • the desired temperature of the product within the belt press is achieved by heating the at least one belt.
  • the product to be post-processed can at the same time be heated by the belt and pressure can be applied to the product by the belt.
  • the pressure is applied and again at least partly released within the belt press at least twice.
  • the pressure can be applied to the product in the product gap e.g. by a first pair of pressure rollers facing each other and a second pair of pressure rollers facing each other, the first pair of pressure rollers and the second pair of pressure rollers being arranged one behind the other in a transport direction of the product through the belt press, wherein in-between the first pair of pressure rollers and the second pair of pressure rollers the pressure is at least partly released.
  • the pressure can also be applied to the product in the product gap by at least one pair of pressure rollers, said pair of pressure rollers having an upper roller and a lower roller, the upper roller and the lower roller being arranged at the same lengthwise portion when seen in transport direction, the upper roller touching a backside of a first belt, the backside of the first belt facing away from the product gap, the lower roller touching a backside of a second belt, the backside of the second belt facing away from the product gap.
  • the pressure can be applied to the product in the product gap by a first upper arrangement of circulating rollers and a second, lower arrangement of circulating rollers, the first arrangement of circulating rollers and the second arrangement of circulating rollers being arranged at the same lengthwise position when seen in transport direction, the first arrangement of circulating rollers touching a backside of a first belt, the backside of the first belt facing away from the product gap, the second arrangement of circulating rollers touching a backside of a second belt, the backside of the second belt facing away from the product gap.
  • the pressure is applied and again partly released during the passing of the circulating rollers over the product or over a portion of the belt which the product touches.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
US18/729,079 2022-01-25 2022-12-12 Method for post-processing of a product, especially paper or paperboard, which has been fabricated from pulp containing lignin Pending US20250109554A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP22153302.9A EP4215669A1 (en) 2022-01-25 2022-01-25 Method for post-processing of a product, especially paper or paperboard, which has been fabricated from pulp containing lignin
EP22153302.9 2022-01-25
PCT/EP2022/085321 WO2023143799A1 (en) 2022-01-25 2022-12-12 Method for post-processing of a product, especially paper or paperboard, which has been fabricated from pulp containing lignin

Publications (1)

Publication Number Publication Date
US20250109554A1 true US20250109554A1 (en) 2025-04-03

Family

ID=80035132

Family Applications (1)

Application Number Title Priority Date Filing Date
US18/729,079 Pending US20250109554A1 (en) 2022-01-25 2022-12-12 Method for post-processing of a product, especially paper or paperboard, which has been fabricated from pulp containing lignin

Country Status (6)

Country Link
US (1) US20250109554A1 (https=)
EP (1) EP4215669A1 (https=)
JP (1) JP2025502520A (https=)
CN (1) CN118591668A (https=)
CA (1) CA3248725A1 (https=)
WO (1) WO2023143799A1 (https=)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025248402A1 (en) * 2024-05-29 2025-12-04 Valmet Tissue Converting S.P.A. Device for processing a continuous web material, in particular a cellulose web material

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200063353A1 (en) * 2018-08-23 2020-02-27 Eastman Chemical Company Cellulose and cellulose ester film

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3011217A1 (de) * 1980-03-22 1981-10-01 Theodor Hymmen Kg, 4800 Bielefeld Vorrichtung zum zusammenfuegen mehrerer werkstoffschichten
EP1470289B1 (en) * 2002-01-29 2011-07-13 Metso Paper, Inc. Calender device for calendering a coated or uncoated fibrous web
FI20020159A7 (fi) * 2002-01-29 2003-07-30 Metso Paper Inc Pinnan muokkauslaite ja laitetta käyttävä menetelmä päällystetyn tai päällystämättömän kuiturainan viimeistelemiseksi
FI120596B (fi) * 2003-03-07 2009-12-15 Metso Paper Inc Menetelmä paperin tai kartongin muokkaamiseksi
FI20035053L (fi) * 2003-04-29 2004-10-30 Metso Paper Inc Laitteisto ja menetelmä paperin tai kartongin valmistamiseksi ja näin valmistettu paperi tai kartonki
FI20075783A7 (fi) * 2007-11-05 2009-05-06 Metso Paper Inc Rainanmuodostuskone
DE102010033578A1 (de) * 2010-08-03 2012-02-09 Sandvik Materials Technology Deutschland Gmbh Doppelbandpresse und Verfahren zum Herstellen eines plattenförmigen Produkts mit einer Doppelbandpresse

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200063353A1 (en) * 2018-08-23 2020-02-27 Eastman Chemical Company Cellulose and cellulose ester film

Also Published As

Publication number Publication date
WO2023143799A1 (en) 2023-08-03
JP2025502520A (ja) 2025-01-24
CN118591668A (zh) 2024-09-03
CA3248725A1 (en) 2023-08-03
EP4215669A1 (en) 2023-07-26

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