Patent Application
20060009105
This invention relates to a fabric for dusting and cleaning. In particular, the fabric of the invention may be used to pick up dust when the fabric is dry, and is absorbent so that the fabric can be used with a liquid solvent or polish or to clean up liquid spills.
Homes are dusty. Dust may come from any number of sources, such as shoe soles carrying dust from the yard or people and pets inhabiting the home. The air itself may hold dust produced by such disparate sources as factories and far-off volcanoes, and this dust may be carried by the air and brought into the home through open windows or HVAC systems. Having entered the home, the dust settles and leaves an unsightly and unsanitary film, if left unattended, on everything in the home.
Homes are also dirty. Dirt may come from beverages spilled on countertops, coffee tables or floors. The dirt may also come from pets and people tracking in dirt from outside the home, infants, dropped food such as potato chips, and any number of other sources.
To keep one's home clean in spite of the dust and dirt, the home must be almost constantly patrolled, dusted and cleaned. Producers realize the battle consumers face in keeping their homes clean, and have developed various fabrics that can be placed on mop heads, or shaped into mitts, to make dusting and cleaning as convenient a task as possible. These fabrics are in many instances disposable, so that a consumer can use the fabric, then dispose of the fabric.
There remains a need in the art for a fabric that is soft to the touch and picks up dust when dry, but is also absorbent so that the fabric can be used with a solvent or polish, or to clean up liquid spills.
According to one aspect of the invention, a cleaning and dusting fabric comprises a first layer that includes about 50 to about 100 percent rayon by dry weight, the first layer having dust collection properties as well as liquid absorbency. A second layer includes a polymer spunbond that provides a structural base for the cleaning and dusting fabric that is soft yet resists tearing. The first layer and the second layer are hydroentangled. A third layer includes thermoplastic fibers having a melting temperature lower than that of each of the first and the second layers and the third layer is hydroentangled to at least one of the first layer and the second layer.
In another aspect of the invention, a cleaning and dusting mitt comprises a first layer comprising about 50 to about 100 percent rayon by weight and about 0 to about 25 percent polyester by weight, a second layer comprising a polypropylene spunbond, the second layer being hydroentangled to at least the first layer, and a third layer comprising fibers having a polyester core with a polyethylene sheath and a melting temperature lower than the first and the second layers, the third layer being hydroentangled to at least one of the first layer and the second layer. The first, second and third layers form a panel, the panel having a mitt shape such that corresponding panels can be superposed and a noncircumambient, heat-sealed seam formed along the edge of the panels to create an opening which permits entry of a human hand. The heat-sealed seam is formed by melting the third layer.
In yet another aspect of the invention, a method of manufacturing a cleaning and dusting fabric comprises the steps of providing a first layer comprising about 50 to about 100 percent rayon, providing a second layer comprising a polymer spunbond, providing a third layer comprising thermoplastic fibers having a melting temperature lower than that of each of the first and the second layers, feeding the first, second and third layers to a hydroentangling unit such that, as the first, second and third layers are fed, the first layer is disposed adjacent to one side of the second layer and the third layer is disposed adjacent to an opposite side of the second layer, and hydroentangling the first and third layers to at least the second layer to form the cleaning and dusting fabric.
In yet another aspect of the invention, the method of manufacturing a cleaning and dusting fabric comprises folding the cleaning and dusting fabric on itself, forming a noncircumambient heat seal along the edge of the cleaning and dusting fabric in the shape of a mitt, and cutting the cleaning and dusting fabric in the shape of a mitt such that an opening is formed along the non-heat-sealed edge that permits entry of a human hand.
In another aspect of the invention, a cleaning and dusting fabric, adapted for dry dusting or absorbing liquids, comprises a first layer comprising about 50 to about 100 percent rayon by dry weight, the first layer having dust collection properties as well as liquid absorbency, and a second layer comprising a polymer spunbond. The second layer provides a structural base for the cleaning and dusting fabric that is soft yet resists tearing. The first layer and said second layer are hydroentangled, wherein the second layer comprises polymer fibers having a melting temperature lower than that of the first layer.
As shown in
The basis weight of the first layer 3 is preferably about 30 g/m2, but can be varied. Generally, the basis weight of the first layer 3 can be varied independently of the other layers in the fabric 1. However, varying the basis weight of the first layer 3 varies the basis weight of the fabric 1, because the basis weight of the fabric 1 is calculated by adding the basis weights of the three layers. Furthermore, the basis weight of the fabric 1 is about 40 to about 100 g/m2, preferably about 50 to about 80 g/m2, and most preferably about 65 g/m2. Accordingly, the basis weight of the first layer 3 is preferably varied no more than is appropriate to maintain the basis weight of the fabric 1 within the above values.
The second layer 5 comprises a polymer spunbond, preferably a polypropylene spunbond. (A spunbond is a solid fiber fabric manufactured from a single strand, which is extruded onto a screen so that the fiber has a random orientation. The result is a solid, nonwoven fabric.) The second layer 5 provides structural stability and strength to the fabric 1, so that the fabric 1 will not pull apart or get snagged and rip when the fabric 1 is wiped across a surface. In addition, the second layer 5 is soft, without sharp or protruding edges. The benefit of having a polymer spunbond layer in a fabric is that, if the fabric 1 contacts a user's skin, the fabric 1 feels soft and comfortable. Other types of spunbond besides a polypropylene spunbond may be used, in which other resins, such as polyethylene, polyester, polyolefin or polyamide resins, may be substituted. A rayon spunbond may also be used.
This second layer 5 preferably has a basis weight of about 15 g/m2, but the basis weight of the second layer 5 can be varied. As stated previously, however, the basis weight of the second layer 5 is preferably varied no more than is appropriate to maintain the basis weight of the fabric 1 as a whole within appropriate values.
The third layer 7 is preferably a bi-component layer comprising fibers having a polyester core 10 enveloped by a polyethylene sheath 12, as shown in
Preferably, the third layer 7 has a low melting temperature, relative to the other layers in the fabric 1. This low melting temperature facilitates heat sealing the fabric to itself or other material, which may be required in some finished products. For example, as discussed in more detail below, to produce a mitt for cleaning and dusting that conveniently fits over a user's hand, the fabric 1 is folded on itself and heat sealed in the shape of a mitt. The heat-sealing operation melts the third layers 7, which oppose each other because the fabric 1 has been folded upon itself. As a result of the melting, the opposed third layers 7 bond. Thus, a low-melting-temperature third layer 7 makes the heat sealing step possible. Once the folded fabric 1 is heat sealed, it is cut with a mitt-shaped die.
The fabric 1 comprising the above-described three layers preferably has a breaking strength of at least 500 g/30 mm, and more preferably at least 1000 g/30 mm.
An alternative embodiment to the fabric 1 described above is shown in
Yet another preferred embodiment of the fabric 1 is shown in
A preferred method of manufacturing the fabric 1 depicted in
With the apparatus shown in
The fiber mats 30, 32 are superposed upon the opposite sides of the polypropylene spunbond 20 at the point of the delivery rolls 70, 72, and the combination of the fiber mats 30, 32 and the polypropylene spunbond 20 is conveyed into a hydroentangling unit 40. In the hydroentangling unit 40, the fibers of the fiber mats 30, 32 are entangled with the polypropylene spunbond 20 by the action of a water jet. Also, the fiber mats 30, 32, which are located on opposite surfaces of the polypropylene spunbond 20, are entangled with each other. In this manner, a fabric 1 is prepared.
After the entanglement, the fabric 1 could be passed between nip rolls 90, 92, if a coating is desired to be placed on the fabric. Regardless, the fabric 1 is conveyed into a heating unit 100. In the heating unit 100, the fabric 1 is subjected to heat treatment for drying. The heat treatment does not subject the fabric 1 to a temperature sufficient to melt any of the layers. The fabric 1, after being subjected to the heat treatment, is passed between nip rolls 110, 112 and is wound into a finish roll 130. In this manner, the fabric 1, which has the structure shown in
Once the fabric 1 is obtained, the fabric 1 may undergo additional processing for different products. For example, to create a mitt as shown in
Other shapes, sizes and uses are also contemplated for the fabric 1. For example, the fabric 1 may be cut into rectangular sections. The rectangular sections, called a cloth, may be placed by a consumer on the end of a mop or sweeper for the purpose of dusting and cleaning floors.
Many different embodiments of the present invention may be constructed without departing from the spirit and scope of the present invention. It should be understood that the present invention is not limited to the specific embodiments described in this specification. To the contrary, the present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention as hereafter claimed. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications, equivalent structures and functions.
The fabric as claimed herein has the purpose of providing consumers a cleaning tool that both collects dust without any solvent or polish, and can also be used with liquid solvents or polishes or to clean up liquid spills. In addition, a method is claimed for manufacturing such a fabric.
This application is a continuation of U.S. patent application Ser. No. 10/655,515, filed Sep. 5, 2003, and entitled “Cleaning and Dusting Frabric,” and claims priority to U.S. Provisional Patent Application No. 60/408,229, entitled Cleaning and Dusting Fabric, which was filed on Sep. 6, 2002 the entire contents of each of which is entirely incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 60408229 | Sep 2002 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 10720715 | Nov 2003 | US |
| Child | 11227055 | Sep 2005 | US |
| Parent | 10655515 | Sep 2003 | US |
| Child | 11227055 | Sep 2005 | US |
