Classifications

• • 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
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/03—Non-macromolecular organic compounds
  • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
  • D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
• • 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
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
  • D21H17/22—Proteins

Definitions

• nnus'r runs or HANAU, GERMANY.
• the duration of the subsequent heating which depends on the quality and on the of the paper, can vary within very wide limits. ltcan be many hours but under certain conditions 'a short subsequent heating of for instance hours, 4 hours duration can give good results.
• the properties of the papers to be produced can be improved by the additional use of colloid bodies such as casein, animal glue and the like, which under the given conditions become hard and insoluble.
• the incorporation of the colloid bodies can precede the treatment of the paper with acid substances and formaldehyde, for instance by addition of casein or animal glue to the pulp. It is however possible also to add these colloid bodies in such a manner that papers which have absorbing capability are impregnated with a solution which contains for instance animal glue besides the acid substances and formaldehyde.
• a magnesium chloride and calcium chloride has proved to be advisable as the solutions of these salts are. capable. even in the presence of formaldehyde, of dissolving comparatively great quantities of animal glue.
• any of the well known moist-devices and eventually several of the same together, can be used.
• salts are used for renllti ' sprinkled l nder certain dering impermeable of meaeee
• the constituents of the solution could be applied separately, one surface of the paper sheet could for instance be painted with a concentrated mixture of dissolvents and a diluting substance for instance could be used for painting the other surface. conditions the impregnating with heated solutions or mixtures of solutions has proved to be advantageous.
• the working method composed of three operations: impregnation, drying and subsequent heating, can be considerably simplilied by executing the impregnation directly -with the drying process for instance in using an impregnating press in such a manner that the paper is conducted through a heat- :ihle dipping device whereupon it is immediately submitted to pressure and conducted over the drying cylinders.
• this working method also the constituents of the impregnating liquid can be applied separately for instance in such a manner thatthe paper is first impregnated with hot salt solution, and pressed whereupon shortly before it gets upon the drying cylinder, formaldehyde is applied to the paper, for instance by sprinding, by conducting the paper over *ollers with formaldehyde or in any other convenient manner, the formaldehyde being preferably applied uponthe surface of the paper which comes in contact with the drying cylinder, wherefrom results, that the formaldehyde, evaporated by the heat, is driven by diffusion at a uniformly distributed state into the paper sheet.
• the Working with impregnating presses has proved to be advantageous in cases in which the renthe paper has been combined with the colouring of the same.
• the process is adopted, amongst other uses, also for the rendering moist proof of spun papers designed to be used for the'production of paper threads, paper fabrics or the like.
• Spun paper rendered moist proof according to this process can be worked directly into impermeable paper threads, fabrics or the like. It is however advisable to insert the impermeating css for manufacturing the paper thread. This can be done in such a manner that for instance the paper in strips, which is spun to threads by simple twisting Whilst being moistened, is impregnated instead. of with water with a solution which according to the invention is designed for rendering the paper moist proof, the paper threads being then dried. and subsequently heated.
• the impermeable paper produced according to the invention can further be refined and improved by being heated in a known manner with varnish, asphaltum, pitch. tar or the like. In the coatings thus applied, threads, light fabrics or the like could be embedded.
• A. process for the production of moistness resisting paper consisting in impregnating the paper with solutions having acidic properties, in drying the impregnated paper at temperatures below 100 C. and in subjecting the dried'paper to a subsequent heating at temperatures from about 60 C. to about 100 C. j
• a process for the production of moistness resisting paper consisting in impregnating the paper with solutions having acidic in drying the impregnated paper at ten'iperatures below 100 C. and in submitting the dried paper to a subsequentheating at temperatures to about 100 C.
• a process for the production of moistness resisting paper consisting in impregnating the paper with a solution of aluminum suiphate as a solution having acidic properties and with formaldehyde, in drying the impregnated paper at temperatures below 100 C. and in subjecting the dried paper to a subsequent heating at temperatures approximately between 6 0 C. and 100 C.
• a process for the production of moistness resisting paper consisting in impregnating the paper with not more than 1% alumiformaldehyde, in drying the impregnatedpaper at temperaand in subjecting the dried paper to a subsequent heating at temperatures from about 60 C. to about 100 C;
• a process for the production of moistness resisting paper consisting in impregnating the paper with not more than 1% aluminum sulphate and with more than 4% formaldehyde, in drying the impregnated paper at temperatures below 100 C. and in subjecting the dried paper to a subsequent heating at temperatures from about. 00 C. to about 100 C.
• A' process tor the production of moistness resisting paper consisting in impregnat ing the paper with substances having acidic properties and with antiseptic substances of which one is formaldehyde, in drying the impregnated paper at temperatures below 100 C. and in subjecting the dried paper to a subsequent heating at temperatures from about C. to about 100 0.
• a process for the production of moistness resisting paper consisting in iu'ipregnating the paper with substances having acidic properties and at the same time are adapted formaldehyde, in drying the impregnated paper at temperatures below 100 C. and in subjecting the dried paper to a subsequent heating at temperatures from about 00 C. to about 100 C.
• a process for the production of moistness resisting paper consisting in impregnating the paper with substances having acidic properties, with antiseptic substances of which one is formaldehyde and with organic colloids, in dryingthe impregnated paper at temperatures below 100 C. and in subjecting the dried paper to a subsequent heating at temperatures from about (30 C. to about 100 C.
• a process for the production of moistness resisting paper consisting in impregnating the. paper with substances having acidic properties and at the same time are adapted to render the paper supple, with formaldehyde, and with organic colloid substances, in drying the impregnated paper at temperatures below 100 C. and in subjecting the dried paper to a subsequent heating at temperatures from about 00 C. to about 100 C.
• a process for the production of moistness resisting paper consisting in impregnating the paper with substances having acidic. properties and with formaldehyde, in such a manner that solutions for higher concentrations are used at degrees of impregnation which amount to less than 10% ot' the weight of the paper pulp, in drying the impregnated paper at temperatures below 100 C. and in subjecting the dried paper to a subsequent heating at temperatures from about 60 C. to about 100 C.

Landscapes

• Paper (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=27130847

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (1)

• 1922
  • 1922-10-14 DE DEF52744D patent/DE415557C/de not_active Expired
  • 1922-10-16 AT AT100719D patent/AT100719B/de active
  • 1922-10-21 US US596140A patent/US1593296A/en not_active Expired - Lifetime
  • 1922-10-23 DK DK33726D patent/DK33726C/da active
  • 1922-10-28 GB GB29491/22A patent/GB187987A/en not_active Expired
• 1923
  • 1923-08-09 GB GB20321/23A patent/GB202314A/en not_active Expired

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