US1955626A - Washable wall paper - Google Patents

Description

April 17, 1934. c FLECK 1,955,626

WASHABLE WALL PAPER Filed May a1, 1933 Patented Apr. l7, i934 par wasps WALK. mean Louis C. Fleck, Appleton, Wia, assignor to Paper Patents Company, l lfl Wis, a corporation of Wisconsin Application May 31 1933, Serial No. 873,721

3 (Claims. (oi. 92-40) My invention relates to decorative paper especially suitable for use as wall covering and has to do more particularly with an improved paper having a water-resistant surface and capable of resisting moderate rubbing with a damp cloth, so that it may readily be cleansed.

' A particular object of my invention is to provide an article of the class referred to which may be made from inexpensive materials and. which I is highly satisfactory for all desired purposes.

A further object is to provide a simple and inexpensive process for producing the above-described article.

Further objects and advantages will" become apparent as the description proceeds.

Referring to the drawing forming part of this specification and illustrating a preferred embodiment of my invention:

Figure 1 is a plan view of a portion of decoraso tive paper made in accordance with my invention,

and

Figures 2 to 6 inclusive are sectional views on an enlarged scale of the same in various stages of manufacture. i 1

My improved process may be practiced as follows:

(1) Coating.-A web of low-cost paper base 10, usually including a substantial proportion of ground wood, which is ordinarily not color fast to light, is coated with a filler 12, such as clay, blanc fixe, barytes, or calcium sulphate, and a potentially water-resistant binder, such as casein, casein and formaldehyde, rosin and starch, or linseed oil and starch. The filler is applied as an aqueous mixture, sufiicient coating being applied to render the paper light-resistant.

This coating step may be carried out according to known methods subsequent to the forming of the paper on the usual paper machine; or in the course of manufacturing the paper web on the paper machine. 7

The amount of coating material is preferably at least 9 pounds, including mineral and binder, per 24 x 36500 sheet ream, the binder comprising approximately per cent of the coating.

After the coating has been applied the web is preferably dried, although, where all steps are carried out as a train, the drying need not be completed.

(2) Printing.The second step consists of printing the design on the web, prepared as above described, with a potentially waterproof water ink 13. For this purpose there may be used aqueous suspensions of pigments, or pigments with fillers, such as clay, or colored fillers, etc.,

and binding material such as casein, or casein and hexamethylenetetramine, or casein and formaldehyde, or rosin and casein, or linseed oil and casein, etc. After the printing, this paper may be partly or entirely dried. (3) FiringP-In the final step the potential water resistance of the binders used in the first and second steps is developed or fixed by treating the web with a solution of a fixing agent, such as alum, aluminum acetate, or alum and formaldehyde, etc. which will react with the binders to convert them into water resistant substances 14. In the cases where formaldehyde or hexamethylenetetramine was used in the first or second steps, the acidity of the aluminum salt solution 7o will render them active. At the conclusion of thisstep the paper is dried.

The product ofthe process as so far described I is a now-glossy, fairly water-resistant paper.

If a glossy surface 15 is desired it may be obtained by applying slight quantities of emulsions of waxes such as Carnauba or Montan waxes, to the coated surface, and polishing it by .means of brushes. Or such a surface may also be obtained by calendering, friction glazing, etc.

Example The following is a specific example of a preferred embodiment of my invention:

I. Paper with a furnish of approximately 5 v 1 Percent No. 1 dry unbleached spruce 25 No. 1 wet unbleached spruce 10 No. 1 ground wood 65 Clay 5 Size 2.0

Alum 4.0

is coated in manufacture with potentially a water-resistant coating, such as casein and formaldehyde and clay, or rosin and starch and clay, or linseed oil and starch and clay. A

typical coating solution is as follows:

# casein.

Add 9 pounds, 8 ouncesof ammonia water (sp. gr. 0.90) to casein solution and 3 pounds of borax which has been dissolved in 2 gallons of water. Heat this mixture to 120 F. Then add 7 pounds of pine oil (used to prevent foaming) and 4 pounds of formaldehyde. (40% solution).

The finished casein solution is then added to and mixed with the clay slip solution.

Sufiicient coating of this mixture is then applied to the paper web on the paper machine to give the finished paper resistance to fading. This amounts to approximately 10 pounds per 24x36-- 500 sheet ream basis.

II. In my preferred embodiments, designs or patterns are printed on the dry paper with water ink.

A typical ink formula is as follows:-

Casein solution for binder Color paste (formula varied according to particular pigment used) Water 9 lbs. 10 ozs. I-Ielio fast red RLD paste '11 lbs. 6 ozs. Clay 21 lbs. Casein solution (formula given above) 40 lbs. Pine oil cc.

Casein solution Mix thoroughly and soak for twenty minutes:

Lbs. Water at 65 C 54 Casein (30 mesh California) 20 Add a solution of:

' Lbs. Water at 80 C 12 Borax 3 Add a solution of Lbs. Water at 60 C 4 A; Soda ash /2 The temperature of the casein solution should now be 55 to 60 C. Hold at this temperature for at least one-half hour, or until perfectly smooth. Cool to about 30 C. (not higher than 35 0.).

Add a solution of:

Lbs. Ozs. Cold water 5 6 Hexamethylenetetramine 1 9 III. The third step involves treating the printed Various modifications coming within the spirit of my invention will doubtless suggest themselves to those skilled in the art. Hence, I do not wish to be limited to the specific embodiments described herein except to the extent indicated by the appended claims, which are to be interpreted as broadly as the state of the art will permit.

I claim as my invention:

1. A water-resistant decorated paper, comprising a paper base including a filler, said paper being printed upon with a water ink, said filler and ink containing a chemical binder, and said binder being chemically fixed to render said printing surface resistant to water.

2. A method of producing an article of the class described, comprising forming a paper web with a filler carrying a potentially water-resistant binder, at least partially drying the paper web, printing upon said web with a water ink also containing a potentially water-resistant binder, and treating said web so as to fix said binder and render the surface of the paper water-resistant.

3. A method of producing an article of the class described, comprising forming a paper web and coating same with a filler containing mineral and a potentially water-resistant binder, at least partially drying the paper web, printing upon said web with a water ink also containing a potentially water-resistant binder, and treating said web so as to fix said binder and render the surface of the paper water resistant.

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