|Publication number||US3293683 A|
|Publication date||Dec 27, 1966|
|Filing date||Jan 4, 1965|
|Priority date||Jan 4, 1965|
|Publication number||US 3293683 A, US 3293683A, US-A-3293683, US3293683 A, US3293683A|
|Inventors||Wyant Gerald W|
|Original Assignee||Union Oil Company Of Callforni|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (24), Classifications (14)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Dec. 27, 1966 G. w WYANT 3,293,683
PAPER TOWEL Filed Jan. 4, 1965 FIG- 2 I N VEN TOR.
GER/4L D 144 WVflA/T ATTORNEY United States Patent F 3,293,683 PAPER TOWEL Gerald W. Wyant, Montreal, Quebec, Canada, assignor to Union Oil Company of California, Los Angeles, Calif, a corporation of California Filed Jan. 4, 1965, Ser. No. 423,120 6 Claims. (Cl. 15-506) This application is a continuation-in-part of my copending application, Serial No. 193,614, filed May 1962 now abandoned, and relates to a novel paper towel structure particularly adapted to use in cleaning glass surfaces such as windows and automobile Windshields. More particularly, it relates to la two-ply paper towel in which each ply is adapted to perform a separate and distinct function.
At the present time, in automobile service stations, it is common practice in cleaning Windshields to spray an aqueous detergent solution on the glass surface and then wipe oif the moisture and loosened dirt with a paper or cloth towel. If a particularly good job is desired, it is usually necessary to give thesurface a final polishing with a dry towel. As is well known such practice is far from satisfactory, both to the customer and the service station attendant. If too much of the detergent solution is employed, eiher the windshield is streaked or hazed with the excess detergent or it must be flushed with clean water and extra towels used for wiping and polishing. If too little of the detergent is used, the windshield is not satisfactorily cleaned and the entire job must be repeated. Moreover, in either event, the operation is time-consuming and uneconomical in that it involves the purchase, storing, dispensing, and manipulation of several materials.
It is accordingly the primary object of the present invention to provide improved means for cleaning windshields, windows, and similar smooth surfaces, which means consists in a unitary article of manufacture comprising a detergent material, means for applying the same to a wetted surface, and means for subsequently drying and polishing the surface. This and related objects and their attendant advantages are achieved in the paper towel structure described in detail below and shown in the accompanying drawing which forms a part of this application. In said drawing, FIGURE 1 represents a plan view of one embodiment of the invention; FIGURE 2 represents an enlarged cross-sectional view of the structure of FIGURE 1; FIGURE 3 represents a plan view of another embodiment of the invention; and FIGURE 4 represents a cross-sectional view of still another embodiment.
Considering now the invention in detaihthe subject matter thereof consists in a two-ply paper towel structure, one ply of which (hereinafter referred to as the first ply) is composed of a fibrous material which tends to undergo some degree of physical deterioration upon contact with a wet surface and has a controlled amount of a detergent material applied to its outer surface, and the other ply of which (hereinafer referred to as the second ply) is substantially free of detergent material and is composed of a different fibrous material which has high water absorption capacity and is substantially resistant to physical deterioration upon contact with a wet surface. In use, the surface to be cleaned is first wetted with water, the latter being suitably applied in the form of a fine spray dispensed from the familiar squeeze bottle or the like.
3,293,683 Patented Dec. 27, 1966 ICC The wetted surface is then scoured with the towel, with the dettergent-bearing side of the first ply being applied to the wetted surface so that the detergent dissolves in the water to form a cleansing foam which loosens the dirt adhering to the surface. In addition, since the first ply is composed of a material which tends to disintegrate in contact with water, it will form a thin sponge-like pad which will serve further to loosen the dirt by mechanical abrasion. When the surface has been thoroughly scoured with the first ply, the towel is turned over and the surface is wiped dry and clean with the second ply. As stated, the latter is highly absorptive with respect to Water and i has high wet strength; consequently, it serves to absorb all of the dirty foam and to polish the surface to complete cleanliness.
As will be apparent from the foregoing, the separate plies of the present towel have separate and distinctly different functions. The first ply serves (a) to apply the detergent material to the surface which is to be cleaned, and (b) to form a mildly abrasive scouring pad. The second ply serves (a) to pick up loosened solid dirt and dirty foam, and (b) to polish the surface to a high gloss. Since such functions are to a considerable extent mutually exclusive, it follows that the essence of the invention lies in constructing the plies from different types of material. As is more fully pointed out hereinafter, a second essen tial feature lies in carefully controlling the manner and amount in which the detergent material is applied to the outer surface of the first ply.
Turning now to suitable materials of construction for the respective plies, the first ply may consist of any fibrous material which tends to disintegrate upon contact with a wet surface. A high degree of water absorbency is not essential since it is the function of the second ply to absorb water and dry the surface being cleaned. Any of a wide variety of animal or vegetable fibers, felted or otherwise provided in sheet form, may be employed but it is preferred to use a paper stock containing a substantial proportion, e. g., 30 percent or more of groundwood. The rough texture of the latter provides the desired abrasive action, and its short fiber length insures the desired tendency to disintegrate upon contact with water. Excellent results are obtained with a paper stock consisting of about 55-65. percent of bleached krait or sulfite pulp and about 35-45 percent of groundwood. Conventional newsprint stock may likewise be employed. Because of the requirement with respect to disintegration, sizing is contraindicated. Also since the two plies function independently of one another, the first ply should be substantially imperforate in order to prevent the second ply from becoming wet While scouring with the first ply side of the towel.
The second ply is suitably constructed of high wetstrength paper towel stock or, more economically, of kraft pulp or even a mixture of knaftt pulp and groundwood. In the latter instance, however, the groundwood content should not exceed about 25 percent; otherwise, the second ply will not have sufiicient wet-strength. A stock consisting of abut percent kraft pulp and about 20 percent groundwood will give very satisfactory results combined with maximum economy, whereas bleached kraft or sulfite pulp which has been chemically treated (as with ureaformaldehyde or melamine-formaldehyde resins) to provide maximum wet-strength may be employed for higher quality, but more expensive, products. Since it is essential that the second ply have high water-absorption capacity, sizin thereof is recluded.
The detergent material which is applied to the outer surface of the first p-ly may be any of the wide variety of materials known to have detergent properties. Ordinary soaps, i-.e., the alkali=metal salts of fatty acids of vegetable or animal origin may be employed, b ut it ispreferred to use one or more of the many so-called synthetic detergents, particularly the alkyl aryl sulfonates, the longchain alkyl sulfates, water-soluble petroleum sulfonates, and sulfonat'ed glycerides. A wide variety of such materials is available commercially under such trademarks as Naccanol, Ultrawet, lj'reft, Petronate, Santomer'se, etc. A preferred class of detergent materials constitutes the sulfonated alkyl benzenes and sulfonated alkylnaphthalenes in which the alkyl group contains about l 18 carbon atoms, e.g., sodium dodecylbenzene sulfonate, sodium oleylnaphthalene sulfonate, etc.
As previously stated, it is important that careful control must 'be exerted with respect to the amount of detergent employed. Too little detergent will of course fail to provide adequate cleansing, whereas too much will form suds or foam in amounts which exceed the obsorption capacity of the second ply. In general, the amount of detergent applied to the first ply should not exceed about 0.08, nor be less than about 0.05, gram per square foot. I have found in order to achieve adequate control of the amount of detergent, it is necessary that the latter be applied to the outer surface of the'first ply, as opposed to impregnating the entire sheet. I have further found that the detergent is most suita'bly applied to a plurality of discrete areas of the surface of the first ply (as opposed to a continuous coating) and that such application is most suitably carried out by a printing technique whereby the first ply is continuously passed over or under a printing roller which is inked with a solution of detergent and is embossed to produce the desired pattern of detergent. The latter is applied to the embossed roller in the form of a solution or paste formed by dissolving or dispensing the detergent in a suitable carrier liquid. Ethylene glycol and similar viscous liquids are preferred as carrier liquids. The concentration of detergent in the carrier liquid will depend upon the identity of the two, as well as upon the amount of detergent to be applied and the proportion of the towel area which is to be covered. Very satisfactory results have been obtained by printing the first ply with a 50 percent solution of Nacconol NRSF (a sodium alkaryl sulfonate detergent manufactured by the National Aniline and Chemical Co.) in ethylene glycol, with the printing roller being so embossed as to apply such solution in the form of uniformly spaced squares whose total area equals about percent of the total area of the ply being printed. Where the towel is to be used in localities where the water supply is relatively alkaline, it is desirable to incorporate a small amount, e.g., 0.02 to 2 percent, of a buffering agent such as citric acid in the printing solution or paste.
Upon completion of the printing operation, the printed ply is dried and re-rolled, preferably in contact with the second ply so as to form the two-ply structure in a Single operation. If it is desired to dispense the towel in roll form, the structure may be perforated during the re-rolling operation so that suitably sized towels can be readily torn from the roll by the ultimate consumer. Alternatively, the re-rolled structure may be cut into individual towels which are then interfolded and packaged for loading into a conventional dispensing cabinet.
In order that the user may distinguish between the two plies, it is desirable that they be formed from stocks of different color. Alternatively, the detergent may be colored so as to present a colored pattern on the first ply and thereby identify the same on the correct side of the towel to be applied to the wetted surface.
Referring now to FIGURES 1 and 2 of the drawing,
there is shown first and second plies 10 and 12, respec tively, with the detergent material being carried on the outer surface of first ply 10 in the form of narrow stripes 14. The structure has @been cut to the indicated length in a zig-Zag pattern 16 which assists in keeping the two plies aligned and prevents them from readily becoming separated. FIGURE 3 shows a similar structure, with the detergent being applied to the outer surface of first ply 18 in the form of uniformly-spaced squares 20 covering about 5 percent of the total area. FIGURE 4 shows a structure similar to that of FIGURE 3 except that the plies have been lightly embossed for the purpose of increasing their adherence to each other and providing increased abrasive properties.
Tabulated below are typical specifications for a paper towel structure constructed in accordance with the invention and particularly adapted for use in cleaning automobile Windshields.
Unbleached kral't, percent. Bleached kratt, percent. Detergent, gm./sq. it, Area coverage, percent Other modes of applying the principle of my invention may be employed instead of those explained, change being made as regards the materials or steps employed, provided the article of manufacture defined by the following claims, or the equivalent thereof, be claimed.
I therefore particularly point out and distinctly claim as my invention:
1. A cleaning towel comprising first and second adherent sheets superimposed to form a two-ply structure, said first sheet being substantially imperforate and composed of a fibrous material which tends to undergo physical deterioration upon contact with a wet surface and having a detergent material applied to the outer surface thereof, and said second sheet being substantially free of detergent material and consisting of a fibrous material having high water absorption capacity and being substantially resistant to physical deterioration upon contact with a wet surface.
2. A cleaning towel as defined by claim 1 wherein said first sheet is composed of paper containing at least about 30 percent of groundwood.
3. A cleaning towel as defined by claim 1 wherein said second sheet is composed of kraft pulp containing from 0 to about 25 percent of groundwood.
4. A cleaning towel as defined by claim 1 wherein said detergent is applied to a plurality of discrete, substantially uiiiformly spaced areas of the outer surface of said first P y- 5. A cleaning towel comprising first and second adherent sheets superimposed to form a two-ply structure, said first ply being composed of an unsized paper pulp containing at least about 30 percent of groundwood and having a detergent applied to a plurality of discrete substantially uniformly spaced areas of the outer surface thereof, and said second ply being composed of an unsized kraft pulp containing less than about 25 percent of groundwood.
6. A cleaning towel comprising first and second sheets superimposed to form a two-ply structure, said first ply being composed of an unsized paper pulp consisting of between about 35 and about 45 percent of groundwood and between about 55 and about 65 percent of a pulp selected from the group consisting of bleached kraft pulp 5 and bleached sulfite pulp, and having an alkyl aryl sulfonate detergent applied to a plurality of discrete substantially uniformly spaced areas of the outer surface thereof in an amount corresponding to between about 0.05 and about 0. 08 gram per square foot of said surface, and said second ply being composed of an unsized paper pulp consisting of about 20 percent groundwood and about 80 percent of unbleached kraft pulp, and opposite edges of said two-ply structure being serrated to assist in main- References Cited by the Examiner UNITED STATES PATENTS taining said plies aligned and to prevent them from readily 10 CHARLES WILLMUTH Pfima'y Examine"- R. L. BLEUTGE, Assistant Examiner.
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|U.S. Classification||15/104.93, 510/180, 162/127, 428/43, 428/535, 162/158|
|International Classification||A47L1/00, A47L13/17, A47L1/15, A47L13/16|
|Cooperative Classification||A47L13/17, A47L1/15|
|European Classification||A47L1/15, A47L13/17|