Plastic article or earthenware shaping or treating: apparatus – Air felting type shaping means – Means forming running length product
Patent
1982-07-06
1983-06-14
Hall, James R.
Plastic article or earthenware shaping or treating: apparatus
Air felting type shaping means
Means forming running length product
B29J 100
Patent
active
043880568
ABSTRACT:
An apparatus for continuously forming a cyclically contoured and densified air-laid fibrous web having alternately spaced relatively high basis weight narrow regions and relatively low basis weight wide regions. This web can be severed by spaced transverse cuts into uniform, contoured articles such as fibrous absorbent cores for disposable diapers having relatively thick, narrow and absorbent crotch areas; and relatively thin waistband regions. The apparatus comprises means for producing such a web without stepwise basis weight gradients. In one embodiment, the apparatus comprises an air-laying drum having an endless lay down surface which is partially masked to define a plurality of alternately spaced relatively wide areas and relatively narrow areas. The apparatus further comprises air-flow modulating means which can be adjusted to provide a relatively broad range of pressure differentials across the relatively wide areas of the lay down surface while continuously maintaining a relatively fixed, high pressure differential across the relatively narrow areas of the lay down surface. Thus, the relative basis weight (weight of fibers per unit area of the web) of the wide regions of the web can be controlled through a limited range without substantially affecting the basis weight in the relatively narrow regions of the web, and without precipitating any step-wise gradients in basis weight or step-wise changes in thickness; in particular in the machine direction.
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Jobes, Jr. Orin
Lee Franky B.
Braun Fredrick H.
Hall James R.
Slone Thomas J.
The Procter & Gamble & Company
Witte Richard C.
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