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

• the principal object of the invention is to provide a simple process forreclaiming such papers which may be easily and inexpen- ,sively carried out in apparatus already in existence in'paper mills and which shall produce, particularly when waste newspaper stocks. are used, a resulting product having superior qualities to the newspaper from which it was made.
• the invention accordingly comprises a process for reclaiming paper having inks or pigments applied thereto, especially newspaper or similar printed paper having ment, which. includes beating .the paper,- treating it with a caustic alkali during beat- -'ing and'mixingan alkali acidfsulfite with the resulting pulp.
• a process for reclaiming paper having inks or pigments applied thereto, especially newspaper or similar printed paper having ment which. includes beating .the paper,- treating it with a caustic alkali during beat- -'ing and'mixingan alkali acidfsulfite with the resulting pulp.
• I'treat used paper such as newspapers
• a suitable beater of the type ordinarily employed in the manufacture of paper.
• the amount of water employed is substantially the same as that used for heating fresh pulp in paper manufacture, namely, approximately 2500 gallons per ton of paper.
• this water is preferably luke Warm or is heated to about 110 F. and I preferv to avoid higher temperatures in most instances. I have obtained satisfactory results with temperatures as low as 80 F.
• the beater is started and ti) it is fed 6 shredded newspappr, or other pa erhavinga pigment thereon with a saponi able binder such as linseed oil.
• a solution of caustic soda is run into the paper stock.
• caustic soda varies from 30 to 70 pounds per ton of newspaper stock but I prefer touse about 50 pounds per ton of newspaper stock, representing approximately 2.5 per cent of caustic soda based on the Weight of the paper taken. This is pref- Q erably dissolved "in 30 gallons of water at room temperature F.) and thus 'is added in the form of an approximately 20 per cent solution.
• wash water below 110 F., preferably at room temperature
• This matei rial may be added in powdered form or dissolved in a small amount of water;
• the amount of sodium acid sulfite used will depend upon the alkalinity of the pulp, enough being employed preferably to neutralize the alkali. in the pulp and provide a. slight excess. acid sullite, further beating of the pulp is continued until the action of the sodium acid sulfite is complete.
• the pulp contains the quantity of water which- I have described above
• the-action-of the sodium acid sulfite is 0 rapid.
• onetonxof pulp of a mushy consi'stency approximately five to twenty minutes depending upon the efiiciency of the stirring apparatus employed, is sutficiei t to pro prise thorough neutralization and'whitening of the pulp.
• the same quantity of a thinner pulp that is, one containing considerably more water may be treated to produce the same results in one to two minutes. In other.
• the action of the sodium acid sulfite for small quantities of pulp is substantially instantaneous and-the ti e required mentioned above represents that necessary for sodium acid sulfite to be brought into con- F'tact with" the fibers.
• the pulp should be allowed, to stand in contact with sodium I aeid sulfite, in order that its action maybe After the addition of sodium 35 tassium acid sulfite.
• alkalis than caustic soda may be used, for example, I may use'caustic potash.
• I may use'caustic potash.
• I also may employ pov Other .kinds of paper than newspaper, having a pigment printed/or otherwise applied thereon with a saponifiable or "like binder, may also be. treated by the process.
• the pulp so obtained may then be run out on the Foudrinier machine, formed into paper, dried, and passed through the usual finishing operations.
• the paper so resulting is superior to the newspaper from which it was made.
• the average news print paper shows a Mullen test of 9.
• Such sheets when reclaimed by my process shows a Mullen test of 13.;
• the above figures have been obtained as a result of a practical mill test on ten tons of paper.
• claimed paper resultingfrom this test was not only stronger as indicated above, but was as bright in color as new unprinted news a 'igmen't applied thereto w .re ucing the paper to pulp and removing the pigment therefrom, and then mixingsaid pul, with an alkali acidsulfite at substa print, and had .as well, a better print surface as was demonstrated'when an edition of a newspaper was printed thereon.
• a process forvreclaimi ng paper having a pigment applied thereto which comprises beatm 110 l caustic alkali during beating and mixing an akali acid sulfite with the resulting pulp 66 at substantially rbom temperature.
• a process for reclaiming newspaper which comprises. beating the newspaper with water at a temperature below 110 F approximately; treating the newspaper withv 6p caustic soda during the, beating, thereby producing an alkaline pulp, washing the pulp so prepared and adding at room temperature approximately a slight eXcess of sodium acid sulfite above that necessary to neutralize the alkalinity of the pulp) 3.
• a process for reclaiming newspaper whichcomprises beating the newspaper with water at a temperature below 110 F. approximately, while running into the beater 70 a 20 per cent caustic soda sblution in an amount equal approximately 2.

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

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10266577

Family Applications (1)

Country Status (3)

Cited By (5)

• 1925
  • 1925-03-12 US US1514625 patent/US1572478A/en not_active Expired - Lifetime
  • 1925-10-27 FR FR606098D patent/FR606098A/fr not_active Expired
  • 1925-11-05 GB GB2786625A patent/GB257774A/en not_active Expired

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