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
  • D21H17/63—Inorganic compounds
  • D21H17/66—Salts, e.g. alums
• • 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
  • D21H17/03—Non-macromolecular organic compounds
  • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
  • D21H17/14—Carboxylic acids; Derivatives thereof
• • 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

• This invention relates to a process of treating paper to render the same moisture, grease and acid proof and to solutions employed for that purpose, and has for one of its objects 5 to produce a wrapping paper which shall be highly transparent and of great strength, while at the same time it is proof against the action of the acids, alkalis, solvents, and moisture, and which shall not be affected by m alcohols, ethers. or esters.
• Such wrapping paper is of great value in putting up many commercial articles in prepared packages.
• a gelatinous mass isdissolved in hot water preferably at a temperature ranging from 140 to 150 F.
• a little more than half of this gelatinous mass is pure gelatin, to
• moss acts as a filler and imparts a high gloss to the finished product
• hide glue not only acts as a filler but toughens the paper treated thereby and also imparts elasticity thereto.
• Pure gelatin is expensive
• Irish moss and hide glue are cheap products, but unlike gelatin, they contain impurities which if permitted to remain, would impair the clear transparency of the paper treated thereby, imparting an undesirable, cloudy, and more or less speckled efi'ect thereto.
• ketone or equivalent purifying agent may be omitted.
• a suitable preservative agent such as sodium benzoate.
• gelatins Irish moss, gelatin, hide glue
• glycerin in and of themselves would form a tacky coating too soft for practical use, and there is therefore added a hardening ingredient which in the present instant consists of sodium aluminum sulphate and potassium aluminum sulphate, the amount of these two sulphates-employed being about one-eighth of the total amount of Irish moss, gelatin and hide glue (by weight) and the sodium aluminum sulphate being in the proportion of about one-half of the potassium aluminum sulphate.
• the sodium aluminum sulphate not only acts as a hardening agent but tends to make the coating brittle.
• the potassium aluminum sulphate on the other hand not only acts as a hardening agent but tends to make the coating elastic, and by using the two sulphates as hardening agents, the desired hardening effect is secured without destroying the desired elastic properties of the coating.
• the impurities in the gels are either precipitated to the bottom of the container or float as a foamy mass on the top of the solution. This foamy mass is carefully skimmed off and the solution then decanted, leaving the precipitated impurities in the bottom of the container. While the sodium benzoate may be incorporated at the same time as the dimethylketone (or other ketone) it is preferably added after the impurities are removed from the solution.
• the solution thus constituted may be applied to the paper by dipping, brushing or otherwise.
• thin paper When thin paper is to be treated so as to render the same transparent as Well as possessing the other desirable characteristics indicated above, it is preferably dipped in the solution, but when heavier paper or cardboard is treated, and particularly when it is desired to treat but one side thereof, the solution is applied thereto by brushing or otherwise.
• continuous Webs either of the thin paper or of the cardboard or heavier paper to be treated, are advanced by suitable rolls by means of which, in the case of the thin paper, the web of paper is dipped into the solution contained in asuitable tank where it is maintained at a temperature of approximately 150 F.
• the web of paper passes from the tank, it is fed to squeeze rolls which operate to remove surplus material therefrom and to uniformly impregnate the paper with the coating filler.
• the coating filler For the continuous application of the coating filler to heavier v paper or cardboard, the same is preferably passed continuously into contact with a roll which dips down into the coating solution and applies it to the web of paper as the same passes over the roll.
• a suitable hardening or congealing agent preferably in the form of 37% formaldehyde in the proportion of about one-fiftieth of the amount of the gels (Irish moss, gelatin and hide glue) employed. Care must be taken to add only a sufiicient amount of this hardening or congealing agent to relieve the solution of its tacky character, since the presence of any over-amount of such agent will tend to solidify the solution.
• the solution After the solution has been applied to the paper web, the same is dried, preferably by passing the same through a vertical drier equipped with hot air blasts supplied from a steam coil or other source.
• This fixing bath is preferably composed of 99% methyl spirits to which is added one pound avoirdupois, 37% formaldehyde and one ounce, avoirdupois.
• C. P. glycerin for each gallon of methyl spirits.
• the formaldehyde is a fixing or hardening agent and the glycerin acts to temper its hardening action while the methyl spirits serves as a carrying agent which quickly evaporates and thus facilitates the continuous practice of the invention with machinery.
• the paper treated with the solution first described after being thoroughly dried is treated with this fixing solution gat a proximately room temperature, say 0 by dipping the same in the fixing solution-or otherwise applying the same.
• the web is by preference passed under a submerged roll at the bottom of the container for the fixing bath, then upward through the fixing solution to glass scrapers which remove surplus liquid, from whence the web is passed through a vertical drying shaft supplied with heat, as by steam coils, from whence it is passed by means of suitable guiding rolls onto a winding roll as a finished product.
• the paper is rendered remarkably transparent and very tough.
• the coating whether app-lied to thin papers or to cardboard or other heavy paper will be found to be moisture proof, grease proof, acid proof (lactic acid excepted), alkali proof and solvent proof. It will not be affected by alcohols, ethers or esters.
• the solution for treating paper which comprises the following ingredients in approximately the following proportions, to wit: pure gelatin 13 pounds, Irish moss 6 pounds, hide glue 3 pounds, glycerin 8 A pounds, dimethylketone' pounds, sodium benzoate A; pound, potassium aluminum sulphate 2 pounds, sodium aluminum sulphate 1 pound, and formaldehyde pound, dissolved in 65 pounds of water.
• a solution for treating paper made by dissolving in water the following substances in approximately the following proportions, to wit: 24 pounds of gelatinous substances, and a purifying agent for said substances, then adding approximately one third as much pure glycerin as gelatinous substances, one quarter as much potassium alummum sulphate as glycerin, one half as much sodium aluminum sulphate as potassium aluminum sulphate, and one half as much 37% formaldehyde as sodium aluminum sulphate, heating the solution to approximately 150 F., skimming oil the impurities that rise to the surface and then decanting the solution.

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• Chemical & Material Sciences (AREA)
• Inorganic Chemistry (AREA)
• Paper (AREA)

Priority Applications (2)

Applications Claiming Priority (1)

Publications (1)

Family

ID=23985949

Family Applications (1)

Country Status (2)

Cited By (3)

• 0
  • BE BE380102D patent/BE380102A/xx unknown
• 1930
  • 1930-12-02 US US499609A patent/US1871842A/en not_active Expired - Lifetime

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