Air-permeable and liquid-impermeable backsheet for use in body fluid absorbent articles, and its manufacturing method
AssigneeUni-Charm Corporation
InventorsHiroyuki Soga, Michiyo Matsushita
Life of this patent
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Abstract
Here is disclosed air-permeable and liquid-impermeable backsheet for use in body fluid absorbent articles. Polyolefin plastic sheet containing inorganic filler particles is stretched and then thermo-embossed to obtain the backsheet 1. At least one surface of this backsheet 1 is composed of a rough surface zone 5 and a smooth surface zone 6 so that these two kinds of zones define together a desired surface pattern over the backsheet. The rough surface zone 5 has fine pores 7 for air-permeability and the smooth surface zone 6 facilitates an absorbent core of the body fluid absorbent article to be seen through this smooth surface zone 6.
Claims1
An article for absorbing body fluid comprising a layer of absorbent material and a backsheet that is liquid-impermeable, the improvement comprising
- (1) said backsheet being composed of a stretched polyolefin plastic containing 30 to 80% by weight of embedded inorganic filler particles based on the weight of the backsheet,
- (2) said backheet contains at least one roughened portion that includes a large number of air-permeable fine pores and a large number of fine projections rising upwardly and formed from the rising up of said filler particles when the backsheet is stretched, and
- (3) the remainder of said backsheet being composed of a smooth thermo-embossed surface containing air-permeable fine pores that is substantially free of fine projections which rise up and which thermo-embossed surface has a higher transparency than said at least one roughened portion.
Dependencies are inferred from the claim text.