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
  • D21C5/025—De-inking
  • D21C5/027—Chemicals therefor
• • 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 improvements in the removal of printers ink from papers and withthis object in view such papers in accordance 'with this invention are pulped or shredded in the presence of aqueous solutions containing one or more alkalis or alkaline reacting substances, then agitated in the presence of artificially colloidized or partially colloidized mineral substances and finally Washed and further treated. in .well
• the mineral substances are those having detergent properties such as the silicates of magnesium for example, soapstone, talc etc; clays such as china clay or kaolin; fullers bakrth, kieselguhr etc., or silica. powder or the Such mineral substances are brought into 2 a colloidized or partially colloidized state by known grinding or agitating means for instance, as .intimately as possible in the presence of a relatively small quantity of a solution of what may be called a dispersator or deflocculant but which perhaps in this case is better termed a protective colloid having adhesive properties, such as casein, gelatine in its various forms, glues albumens, gums such as gumarabic -or gum tragacanth,
• the following example serves to illustrate the materials and quantities thereof that have been used successfully for carrying the invention into effect.
• the heating apparatus employed was of ordinary known type.
• the liquor containingthe ink in suspension is then removed from the pulp by washing in drum washers or other washing machines as known in the art'.
• any remaining traces of alkali may if necessary be removed or neutralized with acids or acid salts in the way known in the paper trade and the pulp is, after bleaching or colouring, or both, in known manner, made into paper which is again quite suitable for printing or other purposes.
• a process for de-inking prlnted paper comprising the steps of pulping the-paper 1n the presence ter; then subjecting the pulp, under agitation, to treatment with an aqueous composition, made by causing a mineral substance having detergent properties to become as finely sub-divided as possible in water with 1 of a solution of alkaline characthe aid of an organic protective colloid hav-.
• a process for de-inking printed paper comprising the steps of pulping the paper in the presence of a solution containing caustic alkali; then subjecting the pulp, under agitation, to treatment with an aqueous composition, made by causing soapstone to become as finely sub-divided as possible in water containing casein in solution; and
• a process for the removal of printers ink from paper comprising the steps ofpulping the paper; and then mixing the pulp with an aqueous composition containing a finely-divided mineral silicate and casein.
• a process for the removal of printers 30 ink from paper comprising the steps of pulping the paper; and then mixing the pulp with an aqueous composition containing finely-divided soapstone and casein.
• a process for the removal of printers ink'from paper comprising the steps of pulping the paper; mixing ground soapstone with water; adding thereto a semisolution of casein; grinding the resultant mixture; mixing the paper pulp and ground mixture to ether; agitating the final mixture; and then subjecting said final mixture to washing.
• a process for the removal of printers ink from paper comprising the steps of 4 pulping the paper; rinding a detergent mineral substance in t e presence of an organic protective colloid having adhesive propert1es; mixing the paper pulp and ground mixture together; agitating the final 50 mixture; and then subjecting said final mixture to washing.

Landscapes

• Health & Medical Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Toxicology (AREA)
• Paper (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9856215

Family Applications (1)

Country Status (5)

Cited By (5)

• 1923
  • 1923-03-26 GB GB863323A patent/GB222160A/en not_active Expired
• 1924
  • 1924-03-26 US US70215124 patent/US1585092A/en not_active Expired - Lifetime
  • 1924-09-25 DE DEG62298D patent/DE444163C/de not_active Expired
  • 1924-09-25 FR FR587716D patent/FR587716A/fr not_active Expired
  • 1924-09-25 NL NL28116A patent/NL15620C/xx active

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