US3438851A - Method for the regeneration of water-resistant paper as well as a method for the manufacture of paper from the material obtained and the sheets and webs of paper thus obtained - Google Patents

Method for the regeneration of water-resistant paper as well as a method for the manufacture of paper from the material obtained and the sheets and webs of paper thus obtained Download PDF

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Publication number
US3438851A
US3438851A US3438851DA US3438851A US 3438851 A US3438851 A US 3438851A US 3438851D A US3438851D A US 3438851DA US 3438851 A US3438851 A US 3438851A
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United States
Prior art keywords
paper
water
resistant
acid
regeneration
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Expired - Lifetime
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English (en)
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Endre Schonberg
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Euro Grondstof NV
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Euro Grondstof NV
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • This invention relates to a method for the regeneration of water-resistant papers, as well as to a method for the manufacture of paper from the material obtained and the sheets and webs of paper thus obtained, in particular to the regeneration of papers which have been made water-resistant by means of urea-formaldehyde resin, melamine-formaldehyde resin and similar synthetic agents.
  • water-resistant papers are: towels, maps, paper for labels and phototype papers.
  • the invention provides a method in which the abovementioned drawbacks are avoided and according to which a favourable digestion of the water-resistant paper is accomplished with a minimum of corrosion of equipment and deterioration of fibre.
  • the material obtained according to the method of the invention is at once suitable for being processed to paper.
  • the method according to the invention comprises the use as an acidic agent for the hydrolysis of one organic compound of the class of aliphatic and aromatic compounds containing in the molecule in addition to at least one acid reacting group also at least one group having anticorrosive properties.
  • the invention is by no means restricted to the following compounds, as examples of aliphatic compounds which may be considered there may be mentioned glutamic acid, HOOCCH CH CHNH COOH, glycocoll, NH CH COOH and compounds with molecules having straight or branched carbon chains with at least one free NH -group and at least one free SO H-gI'Oup in the molecule.
  • aromatic compounds there may be mentioned the naphthylamine-sulphonic acids C1QH5(NH2) and C10H4(NH2) (SO3H)3, the S3- lection of the total of 43 isomers depending on the possibility of obtaining one specific isomer easier than another one and being also defined by the desired colour of the final product.
  • EXAMPLE I 1500 l. of water and 10 kg. of crude non-ground sulphanilic acid were introduced into a spherical digester. The spherical digester was closed, heated with steam and rotated during 15 min. Thereafter the sulphanilic acid was dissolved and the spherical digester was opened. Subsequently 1350 kg. of waste paper labels, rendered waterresistant with urea-formaldehyde resin, and another 1500 l. of warm water were introduced into the boiler. After the spherical digester had been closed digestion took place at l20-130 C. After having been boiled during 1.5 hours the mass was suitable to be processed to a spot-free paper.
  • EXAMPLE II In a spherical digester 20 kg. of crude non-ground sulphanilic acid were dissolved during 15 min. in 3000 l. of water while heating by steam was applied. Thereafter 3000 kg. of waste paper, rendered water-resistant with ureaformaldehyde resin, were introduced into the spherical digester with another 3000 l. of water. The pH value of the liquid was 5.5, After 2.5 hours of boiling the mass was suitable to be processed to spot-free paper. The temperature at the digestion was l20l30 C.
  • EXAMPLE III In an Escher-Wyss Pulpmaster of 8 m. an amount of 20 kg. of raw sulphanilic acid was dissolved in 3000 l. of water, this being done in 15 min. while heating with steam. Thereafter 960 kg. of waste phototype paper, ren- EXAMPLE IV 30 kg. of crude sulphanilic acid were dissolved in 5000 l. of water at 80 C. in a hydra pulper of 16 m. Simultaneously a quantity of 1200 kg. of water-resistant phototype paper, rendered water-resistant partly with ureaformaldehyde resin and partly with melamine-formaldehyde resin, was introduced into the pulper and the amount of water was supplemented to 15000 1.
  • EXAMPLE V 20 g. of old paper (from English ordnance maps), rendered water-resistant with melamine-formaldehyde, were soaked in l l. of water containing g. of glutamic acid with a pH value of 4.0 during 35 min. at 85 C. After having been stirred for 2 min. in a Kenwood mixer this paper was fairly well disintegrated and after a further heating of 30 min. at 85 C. and 2 min. stirring in the Kenwood mixer it was in a disintegrated and spot-free condition.
  • EXAMPLE VI 20 g. of old paper (from English ordnance maps), rendered water-resistant with melamine-formaldehyde, were soaked in 1 l. of water containing 2.5 g. of glutamic acid, with a pH value of 4.15 during 1 hour at 85 C. After having been stirred in the Kenwood mixer this paper was found to be in a disintegrated and spot-free condition.
  • EXAMPLE VII 20 g. of old paper (waste of phototype papers), rendered water-resistant with urea-formaldehyde, were soaked in 1 1. of water containing 5 g. of 1-naphthylamine-6- sulphonic acid (Cleves acid) with a pH value of 3.69 during 1 hour at 85 C. After having been stirred for 2 min. in the Kenwood mixer the substance obtained was of a slightly gray colour but was in a reasonably spot-free and disintegrated condition.
  • EXAMPLE VIII 20 g. of old paper (waste of phototype papers), rendered Water-resistant with urea-formaldehyde, were soaked in 1 l. of water containing 5 g. of 2-naphthy1 amine-l-sulphonic acid (Tobias acid) with a pH value of 4.32 during 1 hour at 85 C. After having been stirred for 2 min. in the Kenwood mixer the substance obtained was slightly grayish but reasonably spot-free and disintegrated.
  • Tobias acid 2-naphthy1 amine-l-sulphonic acid
  • EXAMPLE IX 20 g. of old paper (waste of phototype papers), rendered water-resistant with urea-formaldehyde, were soaked in 1 l. of Water containing 5 g. of 2,6-naphthylamine sulphonic acid (Bronners acid) with a pH value of 4.42 during 1 hour at C. After having been stirred for 2 min. in the Kenwood mixer the product obtained had a greenish-yellow colour but was reasonably well disintegrated.
  • EXAMPLE X 20 g. of old paper, rendered water-resistant with mel amine-formaldehyde, were soaked in 1 l. of water containing 5 g. of 1-naphthylamine-3,S-disulphonic acid with a pH value of 4.1 during 1 hour at 85 C. After having been stirred for 2 min. in the Kenwood mixer the substance obtained had assumed a rosy colour but it was well disintegrated.
  • a method for the regeneration of Water-resistant paper in particular paper containing a formaldehyde resin, comprising mixing the paper at an elevated tem-' perature with an aqueous solution of an organic aliphatic or aromatic compound containing at least one basic amino group in addition to at least one acidic group selected from the class consisting of carboxylic acid group, and sulphonic acid group, the pH of said solution being between about 2.5 and 5.5.

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  • Paper (AREA)
US3438851D 1965-03-02 1966-02-25 Method for the regeneration of water-resistant paper as well as a method for the manufacture of paper from the material obtained and the sheets and webs of paper thus obtained Expired - Lifetime US3438851A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6502643A NL6502643A (enrdf_load_stackoverflow) 1965-03-02 1965-03-02

Publications (1)

Publication Number Publication Date
US3438851A true US3438851A (en) 1969-04-15

Family

ID=19792540

Family Applications (1)

Application Number Title Priority Date Filing Date
US3438851D Expired - Lifetime US3438851A (en) 1965-03-02 1966-02-25 Method for the regeneration of water-resistant paper as well as a method for the manufacture of paper from the material obtained and the sheets and webs of paper thus obtained

Country Status (4)

Country Link
US (1) US3438851A (enrdf_load_stackoverflow)
DE (1) DE1692874B1 (enrdf_load_stackoverflow)
GB (1) GB1127942A (enrdf_load_stackoverflow)
NL (2) NL6502643A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4416727A (en) * 1982-01-11 1983-11-22 Air Products And Chemicals, Inc. Process for recovering fiber from wet-strength resin coated paper

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB587109A (en) * 1942-04-01 1947-04-15 American Cyanamid Co Improvements in or relating to methods of defibering paper and defibered paper produced thereby
US2872313A (en) * 1955-09-08 1959-02-03 American Cyanamid Co Pulping of paper broke containing wet-strength resins
US3245868A (en) * 1963-09-06 1966-04-12 Black Clawson Co Continuous process for the recovery of paper broke containing a wet strength resin

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB438403A (en) * 1934-01-31 1935-11-15 Deutsche Hydrierwerke Ag Improvements in or relating to the purification or reclaiming of used or waste paper
DE667722C (de) * 1936-10-06 1938-11-18 Chem Fab Gruenau Akt Ges Verfahren zur Wiedergewinnung von reinem Papierstoff aus bedrucktem Altpapier
NL84209C (enrdf_load_stackoverflow) * 1952-02-09 1900-01-01

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB587109A (en) * 1942-04-01 1947-04-15 American Cyanamid Co Improvements in or relating to methods of defibering paper and defibered paper produced thereby
US2872313A (en) * 1955-09-08 1959-02-03 American Cyanamid Co Pulping of paper broke containing wet-strength resins
US3245868A (en) * 1963-09-06 1966-04-12 Black Clawson Co Continuous process for the recovery of paper broke containing a wet strength resin

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4416727A (en) * 1982-01-11 1983-11-22 Air Products And Chemicals, Inc. Process for recovering fiber from wet-strength resin coated paper

Also Published As

Publication number Publication date
NL6502643A (enrdf_load_stackoverflow) 1966-09-05
NL126706C (enrdf_load_stackoverflow) 1900-01-01
DE1692874B1 (de) 1971-12-16
GB1127942A (en) 1968-09-18

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