Process for forming a layered paper web having improved bulk, tactile impression and absorbency and paper thereof
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
D21H-005/24
출원번호
US-0582521
(1975-05-30)
발명자
/ 주소
Morgan
Jr. George (Cincinnati OH) Rich Thomas F. (Cincinnati OH)
출원인 / 주소
The Procter & Gamble Company (Cincinnati OH 02)
인용정보
피인용 횟수 :
396인용 특허 :
0
초록▼
A wet-laid composite, soft, bulky and absorbent paper structure is prepared from two or more layers of furnish which are preferably comprised of different fiber types. The layers are preferably formed from the deposition of separate streams of dilute fiber slurries, the fibers typically being relati
A wet-laid composite, soft, bulky and absorbent paper structure is prepared from two or more layers of furnish which are preferably comprised of different fiber types. The layers are preferably formed from the deposition of separate streams of dilute fiber slurries, the fibers typically being relatively long softwood and relatively short hardwood fibers as used in tissue papermaking, upon one or more endless foraminous screens. The layers are subsequently combined to form a unitary web, and the layered, unitary web is dewatered by the application of fluid forces. The moist, layered web is thereafter transferred to an open mesh drying/imprinting fabric. The application of a fluid force to the web creates patterned discrete areas of fibers numbering from about 100 to about 3600 per square inch of projected surface area on the side of the web which contacts the drying/imprinting fabric. The undensified discrete areas which correspond to the mesh openings in the drying/imprinting fabric extend outwardly from the fabric side of the layered web and generally assume the form of totally-enclosed pillows, conically grouped arrays of fibers, combinations thereof or the like. Following transfer of the moist, layered paper web to the drying/imprinting fabric, the web is thermally predried to a fiber consistency of at least about 30 percent. The thermally predried, layered paper web may then be compacted in discrete areas corresponding to the knuckles of the drying/imprinting fabric to impart strength and to adhere the web to the surface of a dryer drum for final drying and/or creping. In the alternative, the thermally predried, layered paper web may be finally dried directly on the drying/imprinting fabric without any compaction by the fabric knuckles. In the latter event, the finally dried web is preferably subjected to mechaical micro-creping to impart softness, flexibility and drape to the fnished sheet. The above described layered structures exhibit significantly improved bulk, flexibility, compressibility, drape and absorptive capacity when compared to prior art paper sheets formed by similar processing techniques from a single slurry comprised of a homogeneous mixture of similar fibers. In addition, the structures which are stratified with respect to fiber type typically yield finished paper sheets having significantly improved tactile impression and softness.
대표청구항▼
A soft, bulky and absorbent unitary paper sheet having a basis weight of from about 5 to about 40 pounds per 3,000 square feet, as measured in an uncreped state, said sheet being characterized by having a structure which in cross-section comprises at least two superposed stratified fibrous layers in
A soft, bulky and absorbent unitary paper sheet having a basis weight of from about 5 to about 40 pounds per 3,000 square feet, as measured in an uncreped state, said sheet being characterized by having a structure which in cross-section comprises at least two superposed stratified fibrous layers in contacting relationship for a major portion of their areas, at least one of said stratified fibrous layers being partially displaced in a plane perpendicular to said sheet in small discrete deflected areas corresponding to the mesh openings in a foraminous fabric and comprising from about 100 to about 3,600 individual deflected areas per square inch, as measured in an uncreped state. A process for the manufacture of a soft, bulky and absorbent unitary paper sheet having a basis weight between about 5 and about 40 pounds per 3,000 square feet, as measured in an uncreped state, which comprises the steps of: a. forming a moist paper web comprising at least two superposed stratified fibrous layers in contacting relationship; b. supporting said moist paper web on a foraminous fabric having between about 100 and about 3,600 mesh openings per square inch; c. subjecting said moist paper web to a pressure differential while on said fabric while said web is at a fiber consistency between about 5 and about 25 percent, thereby partially displacing at least one of said stratified fibrous layers in a plane perpendicular to said sheet in small discrete deflected areas corresponding to the mesh openings in said fabric; and d. final drying said sheet without disturbing the deflected areas of said one of said stratified layers. The process of claim 33, including the steps of adhering said thermally predried paper web to the surface of a dryer drum at discrete locations corresponding to the areas of discrete compaction by the knuckles of said fabric, finally drying said paper web on the surface of said dryer drum, and creping said finally dried paper web during removal from said dryer drum by means of a doctor blade.
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이 특허를 인용한 특허 (396)
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