Differential basis weight nonwoven webs
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example 1
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[0087] A light weight spunbond nonwoven web was produced having a basis weight of 0.37 OSY (12.5 gsm).
[0088] Run-off tests were performed on three different samples of the spunbond nonwoven web. During these tests, 100 ml of water (at a temperature of about 37° C.) was applied to the samples of spunbond web. In particular, the samples were placed on a 30° incline over a liquid absorbent material. During the tests, it was noticed that at the point on each sample where water was hitting the spunbond web, the water began to soak through to the absorbent material and was immediately absorbed. As the water traveled about a 3 inch distance, most of it was absorbed on the way down the liner. In fact, the run-off data for these samples showed that the first and third samples each produced zero run-off while the second sample produced only 1 mL of run-off. Thus, these samples of spunbond nonwoven web produced little to no run-off during experimentation, which is expected from a ligh...
example 2
[0089] In this example, tests were performed in order to examine the run-off results when multiple layers of spunbond nonwoven webs are stacked together in comparison to a nonwoven web made in accordance with the present invention.
[0090] In the initial test, two layers of the 0.37 OSY spunbond web made in Example 1 were stacked together, and the amount of run-off observed was 6 mL.
[0091] Subsequently, a web was created in accordance with the present invention. In creating the sample, a rectangular sheet of the 0.37 OSY spunbond web was used as the bottom layer. Then, 1 inch wide strips of the 0.37 OSY spunbond web were adhered to the bottom layer using a spray adhesive manufactured by 3M. Two of these strips (stacked one on top of another) were adhered to the bottom layer at approximately 1 inch intervals forming horizontal stripes. Thus, the samples included 1 inch wide strips of only a single layer of spunbond web (0.37 OSY) in between 1 inch wide strips of three layers of spunb...
example 3
[0093] In this example, an alternative sample of a nonwoven web was made in accordance with the present invention which included a grid-like pattern of areas of one, two, and three layers of spunbond web. The same spunbond web described in Example 1 was used to make the sample. The sample was made by first laying 1 inch wide strips of the spunbond web over a bottom layer of the web and affixing these strips to the bottom layer using the spray adhesive mentioned above. Subsequently, more 1 inch wide strips of the spunbond web were laid on top of the bottom layer in a perpendicular direction relative to the first layer of strips. Thus, a grid-like pattern of one, two and three layered areas was established.
[0094] An example of such a sample is shown in FIG. 3 wherein lower basis weight areas 62 may represent areas of only one layer of spunbond web (0.37 OSY), higher basis weight areas 64 may represent areas of two layers of spunbond web (0.74 OSY (25.1 gsm)), and highest basis weight...
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Abstract
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