US1871769A - Method for coloring crepe paper and resulting product - Google Patents

Description

Aug. 16, 1932. ALDEN 1,871,769

METHOD FOR COLORING CREPE PAPER AND RESULTING PRODUCT Filed 001;. 7, 1926 I77/7/e77/t0r' 6- arable "r R rfilderu 5, w, 3r

' 'fltt y's.

Patented Aug. 16, 1932 AUNITED STATES PATENT OFFICE MANUFACTURING COMPANY, OF FRAMINGHAM, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS METHOD FOR COLORING CREPE PAPER AND RESULTING PRODUCT Application m'ea October 7, 192e. Serial No. 140,040.

This invention relates to a method for coloring paper (more especially crepe paper and papers of llght Weight, such as tissue) and for rendering the same non-bleeding or relatively fast to water, and to the resuiting product.

The tendency of treating paper with an aqueous solution is to remove any folds such as those of a crepe finish which may have been imparted to it and to otherwise warp and distort its normally flat or generally flat surface.

It is accordingly an object of the present invention to provide a method for making colored paper (which may also be creped) which shall be non-bleeding or relatively fast to dampness or wetting, and in which the surface conformation or finish of the sheet shall be preserved and the original strength substantially maintained. Other objects of the invention will appear from the following disclosure.

The method of the invention therefore includes the creping of a paper sheet, or otherwise imparting thereto the desired conformation and/or surface finish desired, followed by treating the same with a non-aqueous solution of the dye-substance to be employed, and finally expelling the solvent.

The dyes used are preferably insoluble in water but are freely soluble in the so'lvent used, to form therewith a solution which is capable of readily wetting and permeating the cellulosic fibers of the paper sheet. If the dye is normally soluble in water, or is not susceptible to direct combination with the paper, the sheet may be given a preliminary treatment with an appropriate mordant or fixing reagent.

The solvent ispreferably a completely volatile liquid and without deleterious effect upon the paper. The solvent need not be water free [methyl or ethyl alcohol, for example, containing 50% or more of water being found in some instances entirely satisfactory for the purpose], but is preferably, either in whole or in large part composed of an organic liquid or solvent, characterized by being substantially inert toward the physical characteristics and properties of paper though capable of promptly wetting and permeating the cellulosic fibers of the paper and susceptible of complete removal from the sheet as b volatilization.

A preerred and typical example of the application of the invention will be described in relation to its adaptation for the coloring of crepe tissue, reference being bad to the accompanying drawing, in which the figure illustrates diagrammatically a side elevation of the apparatus employed.

In the drawing, numeral 1 indicates a roll of tissue paper carried upon a roller 2 rotatably mounted upon trunnions at 3. Means 4 are provided for treating the paper with the first solution comprising a guide roller 5, a flooding bar 6 (if desired or necessary), a roller 7 dipping into the solution of adhesive or creping bath 8 contained in tank 9, and a creping roller 10, preferably contacting with the roller 7 andhaving a doctor blade 11 mounted in close contact therewith. A drying drum 12 is provided with'guide rollers 13 and 14 and may also be equipped with heating means (not shown), such as steam. The dyeing means may comprise a pair of rollers 16, 17, the lower of which dips into the dye solutionv 18 in tank 19, and is followed by any suitable means for winding or gathering up the finished sheet and also for removing and recovering the solvent.

The sheet is first drawn from roll 1 and passed over guide roller5 and under flooding bar 6 if used and thence over roller 7. or directly betweeen roller 7 and creping roller 10, and then over the surface of the creping roller to the doctor blade 11. The creped sheet may then be passed over guide roller 13, around drying drum 12, over guide roller 14 and thence under flooding bar 15 and between the rollers 16, 17 covered with felt or the like, and finally to the drying apparatus, if used, and gathering equipment employed. The sheet may, in some instances, be drawn through the path as thus defined, but preferably the heavier parts are positively operated at suitable relative speeds, in known ways. i

The sheet of paper is first wet by the creping solution which is brought into contact with its under surface by the roller 7. A sufiicient quantity of the adhesive creping solution passes through the sheet and is distributed by the flooding bar 6. This causes the sheet to adhere firmly to the creping roller 10 which carries it thereon to the doctor blade 11. 'Thecreping roller maybe heated by steam which serves to partially dry the sheet and thereby to increase its adhesion to the creping roller. When the sheet reaches the doctor blade it is lifted oil the roller 1n a succession of short folds or wrinkles which remain in the paper and give it the creped or crinkled effect. \Vhile both the number and sizes of such folds are largely determined by the angle and shape of thedoctor blade. the number of such folds may be greatly increased with the firmer adhesion of the sheet to the roller and the height or width of the individual fold may be correspondingly reduced. -The crepe ratio, or proportion of the length of the original sheet with respect to the length of a creped sheet produced therefrom, may be of the order of 5 to 4 or as high as 10 to 4 under appropriately adjusted operating conditions.

The crepe paper sheet next passes around drying drum 12 to remove residual mo sture and thence between rollers 16, 17, the lower of which applies a film of the solution 18 to the under surface of the sheet. As the paper passes between the rolls they may slightly compress the same, thereby promoting a further and more uniform distribution of the liquid over its surface and into the sheet. This solution is composed of the desired dye, preferably insoluble in water, and a volatile organic solvent. For example. solutions of the following formulas have been satisfactorily employed for the purposes of the present invention:

Blue dye solution Victoria blue base; 1 pound Denatured alcohol 60 gallons Orange dye solution Oil orange 5 pounds Commercial benzol 60 gallons Blue dye solution I Victoria blue B base 1 pound Denatured alcohol 40 gallons plus 20 gal. water The dye solution penetrates the sheet and the fibrous structure thereof and dyes the cellulosic material directly or, if a mordant or other fixing reagent be necessary. it is added to the creping bath; and upon the dye coming in contact therewith, they react with each other and/or with the cellulosic substance of the paper to form an insoluble dye in situ, contained largely within the fibers and in lesser degress upon their outside surfaces. The solvent may now be expelled and recover d in known ways, when the dried sheet is finished and in condition ready for use.

Paper sheets as thus treated are characterized by preserving their original structure and by containing, primarily within the cellular structure of their individual fibers, an insoluble deposit of the dye substance employed. Moreover, dyes may be employed in this manner which are intrinsically non-solublein aqueous solutions and which need not be fixed or mordanted to resist subsequent wetting of the sheet, as well as those dyes which do require subsequent conversion in order either to serve as dyes with respect to the cellulosic fibers of the paper or tube rendered. insoluble, or both.- Again, the procedure permits of making a quantity of uncolored crepe paper and thereafter dyein it in such quantities and at such times and with such colors as may be required without difficulty and without detriment to the crepe efi'ect in the final product produced.

In the practical application of the invention in the arts, various modifications of procedure and substitutions of materials treated and dyes and reagents used may and ordinarily will be resorted to. It is, however, to be understood that such modifications and substitutions are to be considered as comprehended in the above disclosure and included within the scope of the following claims.

I claim:

1. A method for making non-bleeding or fast-colored paper, which comprises treating the paper with a water-insoluble dye dissolved in a substantially non-aqueous solvent, and subsequently expelling the solvent therefrom.

2. A method for making non-bleeding or fast-colored paper which comprises treating the paper with a water-insoluble dye dissolved in a volatile organic solvent, and subsequently expelling the solvent therefrom.

3. A method for making non-bleeding or fast-colored paper which comprises treating the paper with a water-insoluble dye dissolved in alcohol, and subsequently expelling the solvent therefrom.

- 4.. A method for making non-bleeding or fast-colored paper which comprises treating the paper with a fixing reagent and with a solution of a dye in a non-aqueous solvent, zfind subsequently expelling the solvent thererom.

5. A method for making non-bleeding or fast-colored paper which comprises successively treating the paper with a fixing reagent and then with a solution of a dye in a substantially non-aqueous organic solvent,

and subsequently expelling the solvent therefrom.

6. A method for making non-bleeding or fast-colored crepe paper which comprises creping the paper, treating the crepe paper with a dye contained in a non-aqueous solvent thereof, and thereafter removing the solvent from the paper.

7 A method for making non-bleeding or fast-colored crepe paper which camprises creping the paper, treating the crepe paper with a dye,relatively insoluble in water but contained in a non-aqueous volatile solvent thereof, and thereafter evaporating the solvent from the paper.

10 8. A method for making non-bleeding or fast-colored crepe paper which comprises treating the sheet with a fixing reagent, crep- V in the paper, treating the crepe paper with a ye, relatively insoluble in water and contained in a substantially non-aqueous solvent, and thereafter expelling the solvent from the paper.

9. A method for making non-bleeding or fast-colored crepe paper which comprises treating a paper sheet with a solution of fixing reagent and then with a solution of a suitable dye, with intermediate creping of the sheet, the solvent of the final solution being characteristically a substantially nonaqueous organic solvent.

10. A method for making non-bleeding or fast colored crepe paper which comprises treating the pa r with a solution, creping the paper, drying, and treating the crepe paper with a non-aqueous solution of a waterinsoluble dye, and finally expelling the solvent of the dye solution.

Signed by me at Framingham, Massachussetts, this second day of October, 1926.

GARDNER R. ALDEN.

Images