US3451758A - Trapezoidal scouring pad of non-woven fibrous material - Google Patents

Description

June24, 1969 H, MC 3,451,758

TRAPEZOIDAL SCOURING PAD 0F NON-WOVEN FIBROUS MATERIAL Filed May 11, 1966 may I INVENTOR.

Fig. 5b Herbert K. McClain ATTORNEY United States Patent 3,451,758 TRAPEZOIDAL SCOURING PAD 0F NON-WOVEN FIBROUS MATERIAL Herbert K. McClain, Wyoming, Ohio, assignor to The Procter & Gamble Company, Cincinnati,0hio, a corporation of Ohio Filed May 11, 1966, Ser. No. 549,248 Int. Cl. A47] 17/08 U.S. Cl. 401-201 7 Claims ABSTRACT OF THE DISCLOSURE A scouring pad comprising non-woven, non-absorbent fibers in three dimensional open arrangement having a plan view shape of a trapezoid. Preferably the pad is made of thermo-plastic synthetic fibers and contains a detergent cake.

This invention relates to a scouring pad made of nonwoven fibrous material having a plan view shape of a trapezoid, whereby the use and manufacturing characteristics of the pad are improved.

Securing pads of non-woven fibrous materials are old and have been widely used. Heretofore, however, they have generally been in circular, oval or rectangular shapes. Circular and oval shaped scouring pads have ad vantageous use characteristics in that their rounded edges facilitate the cleaning and scouring of the insides of conventional round cooking ware. Such rounded corners, however, are not very effective when scouring non-round articles. Moreover, scouring pads are sometimes used for cleaning floors and cupboards where the rounded edges are ineffective in corners. Circular and oval scouring pads have a further disadvantage in that their manufacture from sheet stock involves a substantial amount of waste. Rectangular scouring pads, however, can be manufactured from sheet stock without waste, but have square corners which have only mediocre effectiveness in scouring rounded cooking vessels and in reaching out-of-the-way areas on floors and in cabinets. Moreover, rectangular shaped scouring pads are undistinctive in appearance.

It is an object of this invention to provide a scouring pad which can be manufactured from sheet stock without waste, has a shape which is distinctive in appearance and provides effective scouring and cleaning in difficult to reach areas as well as the rounded insides of cooking vessels.

These and other objects are achieved with the scouring pad of this invention which comprises nonswoven, nonabsorbent fibers in three dimensional open arrangement and which has a plan view shape of a trapezoid. This trapezoidal scouring pad has two acute angles which are very effective in scouring and cleaning corners and out of the Way places. It also has two obtuse angles which provide effective cleaning and scouring in rounded cooking vessels. The trapezoid is a distinctive shape and can also be cut from sheet stock without waste.

Preferably the trapezoid, which is the plan view shape of the scouring pad, has a base ranging from 3 to 5 inches in length, has interior angles between the base and sides ranging from 55 to 75 and has a height ranging from 2 to 2% inches. The angles between the base and sides which are employed within the above range are equal.

trapezoid, with the top, sides and obtuse angles taking care of themselves. These preferred dimensions are such that the pad has superior handling and use characteristics for the average housewife, particularly with respect to the way it fits into a womans hand and to the acute and obtuse angles for the desirable use characteristics described above. Preferably the pad has a base length of about 4 inches, a height of 2 /2 inches and interior angles between the base and sides of about 65-75 In such a preferred pad the top is about 2%inches long, and the sides measure about 2 /2 inches.

While certain parallelograms have a pair of acute and a pair of obtuse angles, such shapes are not easy to handle. Moreover, they package inefficiently because of the extreme diagonal measurement.

While the specification concludes with claims particularly pointing out and distinctly claiming the subject matter regarded as forming the present invention, the invention will be better understood from the following description taken in connection with the accompanying drawings in which:

FIGURE 1 is a plan view of the scouring pad of this invention showing the trapezoidal shape as described above and having the preferred two-layer construction with peripheral seams as hereinafter described.

FIGURE 2 is a cross-section view taken on line 22 of FIGURE 1 showing another preferred aspect of the scouring pad, a detergent cake insert.

FIGURE 3 is a perspective view showing a series of joined preferred scouring pads prior to separation along the transverse seams to form individual scouring pads. This view also illustrates the lack of 'waste in and manufacture from sheet stock.

FIGURE 4 is a perspective view of an individual preferred scouring pad of the present invention.

FIGUR-ES 5a, 5b and 5c are perspective views of various shapes in which the detergent cake insert shown in FIGURE 2 can be employed.

The nonwoven fibrous material used in making the trapezoidal cleaning and scouring pads of this invention preferably comprises non-absorbent, non-matting fibers of various lengths which generally range from about onehalf inch to about two inches. The fibers are in an open three-dimensional arrangement, preferably random arrangement. While FIGURES 1, 3 and 4 indicate an oriental structure as may be found in steel wool, they are also intended to represent a random arrangement. The three-dimensional arrangement of fibers provides many advantages in loft and resilience, but it will be understood that the nonwoven fibrous material used in the practice of the present invention can vary from such fiber arrangement so long as any other fiber arrangement has the advantages inherent from the use of the desired material possessing the preferred fiber arrangement. The fibrous material is in the form of a fibrous layer which can be used as a single thickness, Ma to /2" thick, or which can be used with another layer in dual layer construction, A to thick, preferably with sealed peripheral seams. Thicker pads up to 1" thick or more can also be formed.

The nonwoven fibrous material can comprise synthetic fibers, metallic fibers, or various animal or vegetable fibers, either alone or in various combinations. The metallic fibers that can be used, either alone or in combination with other fibers, include steel wool, brass: wool and stainless steel fibers. Individual metallic fibers are usually quite long when employed to make fibrous layers. Particularly preferred are the synthetic fibers which are shorter in length, e.g. /2"2. The most satisfactory synthetic fibers are the thermoplastic synthetic fibers and include those made of nylon (e.g., polyhexamethyleneadipamide, polycaprolactam, and the like), polyethylene, polypropylene, polyester fibers (e.g., polyethyleneterephthalate, and the like, rayon, cellulose acetate, modacrylic fiber (a copolymer of vinyl chloride and acrylonitrile) commercially available under the trademark Dynel, acrylic fiber (formed from a polymer of acrylonitrile) such as commercially available under the trademarks Orlon and Acrilan, polyvinylidene chloride-polyvinyl chloride copolymer fibers, and the like fibers. The fibers can be curled, crimped and/or straight.

The denier of the fiber used can vary widely, i.e., from 6 to 1000, depending upon the results desired. For example, heavy denier nylon, e.g. 600 denier is preferred for use in making coarse pads for rough scouring jobs. For fine scouring jobs the nylon may be of lighter denier, e.g. denier or can be mixed with various soft fibers.

While the above described fibrous material, in a fibrous layer, can be used for the pads of this invention per se, preferably at least the opposite side surfaces of the nonwoven fibrous material are lightly impregnated with adhesive, e.g., a resin. The amount of adhesive applied, e.g., sprayed, on either surface of the fibrous layer is sufficient to bond the fibers together so as to form a self-sustaining layer of material when it is cut into a suitable size. The amount of adhesive is preferably sufiicient to cause concentration of the adhesive at the surface area of the layer rather than in the center or middle of the layer. This is achieved by employing an amount of resin which preferably avoids penetration of substantial amounts of adhesive to the center or middle of the layers. The bonding of the fibers prevents them from pulling out and thereby insures dimensional stability of the layer for a much longer period of time than is possible with unbonded fibers.

An adhesive can be used, if desired, which penetrates to the center or middle of the layer such that the layer is substantially uniformly coated throughout with the adhesive material. By way of example, a fibrous material in which the adhesive is substantially uniformly distributed is described in US. Patent 2,784,132 issued to Emanuel N. Maisel on Mar. 5, 1957. The disclosure of the Maisel patent is incorporated herein by reference with respect to its teachings on adhesive-bonded nonwoven fibrous materials.

The adhesive can comprise any fusible adhesive material, resinous or otherwise, which fuses under heat and coalesces to bind the fibrous material into unitary pad. Such resins can also be employed to form the heat seal areas in the preferred dual layer constructed pads. Examples of thermoplastic resinous adhesives which can be used are polyvinyl alcohol, polyvinyl chloride or polyvinyl acetate or the copolymers thereof, and natural resinous adhesive materials such as rosin, and the like. A rubbery adhesive binder composition can be used such as butadiene-acrylonitrile copolymer latex having about 60 parts butadiene to 40 parts acrylonitrile, sold commercially by B. F. Goodrich Company under the trade name Hycar Latex 1561 and cured to a stable resilient rubbery condition.

Both surfaces of the fibrous layer can be treated, e.g. sprayed, with the same adhesive, if desired. However, if increased scouring action is desired, the surface of the fibrous layer that eventually becomes the outer surface of a cleaning and/or scouring pad is preferably treated, e.g., sprayed, with an adhesive in which an abrasive particle is embedded.

A fibrous material of the type disclosed in US. Patent 2,958,593 issued to Howard L. Hoover et al., on Nov. 1, 1960 can be used in which abrasive particles are adhered and distributed uniformly throughout the fibrous material. The disclosure of the Hoover et a1. patent is incorporated herein by reference with respect to its teachings on adhesive-bonded nonwoven fibrous material.

The scouring action of such a preferred pad depends upon the size of grit contained in the adhesive, the type of fiber, and the denier of fiber used. Silicon carbide (grit) and aluminum oxide (alumina) are examples of suitable abrasive particles. Other examples of suitable abrasive particles are silica (sand, quartz), ground glass (calcium silicate), pumice, ilmenite (FeTiOg), CeO Fe O (hematite) ZrO zirconium silicate, Ti0 and topaz. The resin ous abrasives described in US. Patents 3,070,510, 3,151,- 027 and 3,251,800 can also be used. Preferably such abrasives range in particle size from 1 to 50 microns.

In another preferred aspect of this invention the fibrous layer can be impregnated with detergent. Impregnation is preferably done with the detergent in a liquid form. The liquid form usually contains up to 35% detergent in an aqueous vehicle. Such a detergent can be any of the many detergents known in the art such as soap and anionic and nonionic synthetic detergents. They are preferably one or more of the active detergent compounds employed in the dilute liquid composition described in US. Patent 3,179,599 issued Apr. 20, 1965 to Stanley L. Eaton and Edmund F. Gebhardt. Preferably the amount of such detergent can range from A% to 2% by weight of the total fibrous material in the pad.

The preferred construction for the trapezoidal scouring and cleaning pads of this invention comprises two individual superposed layers of nonwoven fibrous materials seals, preferably by heat sealing, together at the side edges; at least one of the two superposed layers of nonwoven fibrous material has at least the surface of its fibers coated with a heat-sealable resin. The two layers are superposed with this coated fiber surface of the one layer being juxtaposed with a surface of the other layer. Heat is applied to the edges, e.g. by a hot gas passing through the superposed trapezoidal layers, at a temperature sufficient to fuse the heat-scalable resin in the trapezoidal peripheral sealing pattern. The sealing area of the juxtaposed layers is then compressed for a brief interval until the resin coalesces thereby joining the layers in the desired sealing pattern. The joined layers can thereafter be trimmed if desired.

The peripheral heat sealed superposed layers of the trapezoidal pad provides adequate interbonding of the fibers in the layer edges so as to avoid shredding of and distortion of the scouring pads.

Preferably, the preferred cleaning and scouring pads of this invention have a detergent cake interposed between two layers of nonwoven fibrous material. Such a cake is inserted before the layers are sealed together. In this preferred embodiment, the detergent cake is entirely surrounded and enclosed by the heat seal area of the sealing pattern so that the finished cleaning and scouring pad has the washing composition centrally located.

The cleaning and scouring pads of this invention can be of the type generally illustrated and described in US. Patent 3,175,331, issued on Mar. 30, 1965, to Joseph I. Klein, and can preferably be formed by the techniques described therein. Preferably, however, the preferred trapezoidal scouring pads of this invention are formed by the method and apparatus described in the copending patent application of Norman J. Franz, Ser. No. 525,947, filed Feb. 8, 1966.

Example I Trapezoidal scouring pads were prepared as follows: Two fibrous layers were superposed. Each layer somprised non-woven, non-absorbent nylon batting inch thick, made of 6 to 15 denier staple fibers 1 long, in 3-dimensional random arrangement. The batting had about -90% voids and weighed 4 oz. per square yard. The nylon fibers in the batting were bonded together with a heat-scalable resin, green in color. The resin was a mixture of melamine formaldehyde resin and polyvinyl chloride resin. The resin not only bonded together the nylon fibers, but contained silica abrasive, the particle size of which ranged from 0.5 micron to 60 microns. The total composition of the batting was as follows:

Percent Nyon fibers 33.6 Melamine formaldehyde resin 15.65 Polyvinyl chloride resin 14.35 Silica 36.4

Between the superposed fibrous layers, prior to sealing, was placed a synthetic detergent cake having the following composition.

Percent Sodium linear dodecyl benzene sulfonate 27 Ethanolamide of coconut fatty acids 2 Sodium tripolyphosphate 17 Trisodium phosphate 7 Sodium sulfate 4.5 Sodium bicarbonate 35 H O 7.4 Perfume 0.1

The cake was rectangular in shape and had the following dimensions:

Inches Thickness 7 Height 1% Length 1% The cake was prepared according to the process described in US. Patent 3,178,370 issued Apr. 13, 1965 to Richard Henry Okenfuss.

As seen in FIGURE 2 the superposed fibrous layers, 10 and 11, with the detergent cake 12 between, were then cut into equal trapezoidal shapes, then heat sealed around the edges 13, 14, 15 and 16 according to the process described in U.S. Patent 3,175,331, such that there was a continuous thin peripheral edge around the resulting pad 17. The resulting sealed pad had the following dimensions:

Base inches... 4% Top do 2% Sides do 2 Height do 2% Interior angles between the base and sides degrees 67 Thickness inch 0.825

ethylene oxide 73.53 Sodium coconut alkyl glyceryl ether sulfonate 11.75 Dodecyl dimethyl amine oxide 14.71

This water in this synthetic detergent mixture was re moved by drying.

The total composition of the pad was as follows:

Percent Batting (2 layers) 26.02 Detergent cake 73.12 Liquid synthetic detergent 0.86

The above trapezoidal scouring pad can also be made very effectively by the process of Norman J. Franz described in copending application Ser. No. 525,945 filed Feb. 8, 1966 wherein a log of connected trapezoidal pads with detergent cakes including therein are prepared as shown in FIGURE 3. These pads can then be cut apart to form the pad shown in FIGURE 4.

The composition and shape of the detergent cakes employed in the preferred embodiment which includes such cakes are not critical. Preferably, however, the detergent cakes are of compositions having good detergency and suds characteristics, such as soap or the synthetic detergent cakes described in US. Patent 3,178,370. Any of the detergent cake compositions described in copending application Ser. No. 500,324, filed Oct. 21, 1965, and now abandoned, by Richard Henry Okenfuss can be employed.

The shape of the detergent cake can be any which fits within the sealed superposed fibrous layers making up the scouring pad: preferably the cake ranges from to thick. The cake can be rectangular as shown in FIGURE 5a and as employed in the above example. This is the most practical shape when the cakes are formed by extrusion and cut in suitable lengths on high speed machinery. Desirably, the detergent cake is in the form of a trapezoid as shown in FIGURE 50, corresponding in configuration but reduced in the dimensions corresponding to the scouring pad in which it is employed. This shape fills the maximum amount of available space in the pad. Disc-shaped cakes as shown in FIGURE 5b can also be employed.

Example 11 No. 0 grade steel wool can be formed by stamping into a trapezoidal shape having a 4 inch base, a height of 2 inches and interior angles between the base and sides of 60. The steel wool can be a non-woven, fibrous, 3-dimensional generally oriented construction with long individual steel fibers. The trapezoidal pad formed is about thick and easy to handle; its obtuse angles are effective for scouring the insides of round cooking vessels; its acute angles are efiective for hard-to-reach corners.

Similar pads can be cut or formed from layers of nonwoven fibrous material which is formed of metallic or synthetic fibers which are non-absorbent and arranged in a 3-dimensional open structure. Such material can be used alone or with a resinous bonding agent, with or without impregnated abrasive.

While the preferred aspects of this invention have been described in the joining of two separate layers of non woven fibrous material, it is not so limited. For example, similar results can be achieved by folding over a single layer such that the fold forms one side edge of the pad and the other three sides of a series of pads are formed with heat seals.

The pads of this invention can also contain additives such as perfumes and dyes.

All percentages herein are by weight.

What is claimed as new is:

1. A cleaning and scouring pad for hand use comprising non-woven, non-absorbent fibers in three-dimensional open arrangement having a plan view shape and size of a trapezoid having a base ranging from 3 to 5 inches in length and having interior angles between the base and side which are equal and range from 55 to 75.

2. The scouring pad of claim 1 wherein the trapezoid has a height ranging from 2 to 2% inches.

3. The scouring pad of claim 2 which comprises two superposed layers of said fibers, sealed together around the periphery of the pad.

4. The scouring pad of claim 3 in which the fibers are thermoplastic synthetic fibers at least partially impregnated with a heat-scalable resinous adhesive and the peripheral edges are heat sealed.

5. The scouring pad of claim 4 which contains, between the heat-sealed superposed fibrous layers, a detergent cake.

6. The scouring pad of claim 5 wherein the trapezoid has a base of about 4 inches, a height of about 2 /2 inches and equal interior angles ranging from 65 to 75.

7 8 7. The scouring pad of claim 5 wherein the fibrous FOREIGN PATENTS layers are impregnated with a detergent. 147,880 9/1931 Switzerland.

1,115,660 1/1956 France. References CIted 1,081,010 6/1954 France. UNITED 5 816,188 Great Britain.

1,478,112 12/1923 Flather 15-209 ROBERT W. MICHELL, Primary Examiner. 2,497,206 2/1950 Bruce et a1. 15-2095 2,521,984 M1950 Lang ROBERT 1. SMITH, Assista t Examiner.

3,054,127 9/1962 Petsch et a1. 15 244 10 3,175,331 3/1965 Klein 15-506 XR

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