Surgery – Respiratory method or device – Ozone or ion generation
Patent
1975-11-20
1978-10-03
Michell, Robert W.
Surgery
Respiratory method or device
Ozone or ion generation
428195, 428290, 128287, A61F 1316
Patent
active
RE0297895
ABSTRACT:
An absorbent article includes an air-laid fibrous web having a medial portion of a greater basis weight than flanking end and side portions. The fibers forming one surface of the web are adhesively bonded together to provide an abrasion resistant, non-pilling, facing layer, and also to aid in maintaining the structural integrity of the web. The fibers forming the other surface of the web are either adhesively bonded together, or a separate backing sheet, preferably in the form of a water-proof plastic sheet, is adhered directly to the other surface of the web to form a stabilized backing layer. The above constructions are adapted for use as disposable diapers.
Apparatus of this invention includes a vacuum box having an open end underlying a discrete section of a foraminous forming surface so that regions of the forming surface extend beyond the open end of the vacuum box. Vacuum connection means permit the establishment of a different pressure drop across the discrete section of the foraminous forming surface overlying the open end of the vacuum box than through regions of the foraminous forming surface extending beyond the vacuum box. Drive means move the foraminous forming surface and vacuum box in registration with each other through a web forming area for maintaining the same discrete section of the foraminous forming surface in overlying relationship with the open end of the vacuum box as the foraminous forming surface and the vacuum box are moved through the web forming area.
The method of this invention employs the above-described apparatus in which the foraminous forming surface extends beyond, and completely circumscribes the open end of the vacuum box. A greater pressure drop is established through the discrete section of the foraminous forming surface overlying the vacuum box than through the regions extending beyond the vacuum box to form a fibrous web having a medial portion with a greater basis weight of fibers therein than in flanking end and side portions of the web.
REFERENCES:
patent: 2788003 (1957-04-01), Morin
patent: 3386442 (1968-06-01), Sabee
patent: 3430629 (1969-03-01), Murphy
patent: 3444859 (1969-05-01), Kalwaites
patent: 3612055 (1973-10-01), Mesek et al.
patent: 3766922 (1973-10-01), Krusko
patent: 3828783 (1974-08-01), Kennette
patent: 3848598 (1974-11-01), Mesek
Faigus Martin L.
Foley William J.
Michell Robert W.
Scott Paper Company
Stremcha J.
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