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US3881987A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for forming apertured fibrous webs

Assignee: Kimberly Clark Tissue Co
•
Filing: 1971-12-06
•
Granted: 1975-05-06
•
Expires: 1991-12-06
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Abstract

Abstract Apertured fibrous webs are disclosed which are formed by a wet laying process, as on a papermaking machine, which webs have from about 100 to about 1,300 apertures per square inch of the web, the apertures being arranged in a predetermined pattern. A method is disclosed for forming the above-described apertured fibrous webs involving the step of removing fibers from predetermined areas of a layer of a stock mixture of liquid and fibers disposed upon a drainage member during removal of liquid from the stock mixture by drainage through the drainage member and formation of a fibrous web upon the drainage member, whereby an apertured fibrous web is formed upon the drainage member which is removable from the drainage member by a couch roll or other conventional papermaking techniques. A foraminous belt-like structure is disclosed for use as a drainage member in the method and apparatus for forming apertured fibrous webs. The foraminous belt-like structure comprises a drainage member having a plurality of apertures substantially uniformly disbursed throughout, and flow control means, which in some instances comprise bodies of settable material, connected to the drainage member in a manner which prevents flow of liquid through the apertures in predetermined areas of the drainage member, the number of these predetermined areas being from about 100 to about 1,300 per square inch of said member. A method is disclosed for preparing the above-described foraminous belt-like structure including inserting filling material into apertures in the drainage member which will ultimately be open for drainage after which a settable material is inserted into the remaining apertures of the drainage member in the predetermined areas in which flow of liquid through the drainage member is to be prevented. The settable material is fixed or cured depending upon its composition, after which the filling material is removed from the drainage member, leaving the desired foraminous belt-like structure.

Inventors

  • 👤 Charles S Benz

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 16:39
CPC Classifications
D; D21; D21F; D21F9/00; D21F9/02; D21F11/00; D21F11/008

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 286 words
A METHOD FOR FORMING AN APERTURED FIBROUS WEB, SAID METHOD COMPRISING THE STEPS OF: A. PREPARING A STOCK MIXTURE COMPRISING LIQUID AND FIBERS; B. DELIVERING SAID STOCK MIXTURE IN THE FORM OF A SLICE SUBSTANTIALLY PARALLEL TO AN UPPER SURFACE OF A MOVING DRAINAGE MEMBER AND AT A SPEED WHICH IS DIFFERENT FROM THE SPEED OF SAID DRAINAGE MEMBER FOR CREATING EDDY CURRENTS IN SAID STOCK MIXTURE ON SAID DRAINAGE MEMBER, SAID DRAINAGE MEMBER HAVING AN UPPER SURFACE AND A LOWER SURFACE AND A PLURALITY OF APERTURES CONNECTING SAID UPPER AND LOWER SURFACES, SAID APERTURES BEING SUBSTANTIALLY UNIFORMLY DISPERSED THROUGHOUT SAID DRAINAGE MEMBER, SAID DRAINAGE MEMBER INCLUDING FLOW CONTROL MEANS AFFIXED THEREON ADAPTED TO PREVENT FLOW OF LIQUID FROM SAID STOCK MIXTURE THROUGH THE APERTURES IN PREDETERMINED AREAS OF SAID DRAINAGE MEMBER, THE NUMBER OF SAID PREDETERMINED AREAS BEING FROM ABOUT 100 TO ABOUT 1,300 PER SQUARE INCH OF SAID MEMBER, WHEREBY FLOW OF LIQUID FROM SAID STOCK MIXTURE THROUGH SAID PREDETERMINED AREAS OF SAID DRAINAGE MEMBER IS PREVENTED; AND C. APPLYING SUCTION TO THE LOWER SURFACE OF SAID DRAINAGE MEMBER TO DRAW LIQUID THROUGH SAID DRAINAGE MEMBER WHILE SAID EDDY CURRENTS EXIST IN SAID STOCK MIXTURE, SAID EDDY CURRENTS SWEEPING AWAY FIBERS FROM AREAS IN SAID STOCK MIXTURE WHICH OVERLIE FLOW CONTROL MEANS TO FORM APERTURES IN OVERLYING RELATIONSHIP WITH SAID FLOW CONTROL MEANS, SAID SUCTION APPLYING A FORCE AGAINST THE FIBERS IN AREAS OTHER THAN SAID PREDETERMINED AREAS FOR HOLDING THE FIBERSS ON SAID DRAINAGE MEMBER IN SAID OTHER AREAS FOR FORMING SUBSTANTIALLY CONTINUOUS FIBROUS WEB PORTIONS, WHEREBY AN APERTURED FIBROUS WEB IS FORMED UPON SAID DRAINAGE MEMBER, SAID WEB HAVING A NUMBER OF APERTURES SUBSTANTIALLY CORRESPONDING TO THE NUMBER OF SAID PREDETERMINED AREAS.
Claim 2
Independent Claim 286 words
A METHOD FOR FORMING AN APERTURED FIBROUS WEB, SAID METHOD COMPRISING THE STEPS OF: A. PREPARING A STOCK MIXTURE COMPRISING LIQUID AND FIBERS; B. DELIVERING SAID STOCK MIXTURE IN THE FORM OF A SLICE SUBSTANTIALLY PARALLEL TO AN UPPER SURFACE OF A MOVING DRAINAGE MEMBER AND AT A SPEED WHICH IS DIFFERENT FROM THE SPEED OF SAID DRAINAGE MEMBER FOR CREATING EDDY CURRENTS IN SAID STOCK MIXTURE ON SAID DRAINAGE MEMBER, SAID DRAINAGE MEMBER HAVING AN UPPER SURFACE AND A LOWER SURFACE AND A PLURALITY OF APERTURES CONNECTING SAID UPPER AND LOWER SURFACES, SAID APERTURES BEING SUBSTANTIALLY UNIFORMLY DISPERSED THROUGHOUT SAID DRAINAGE MEMBER, SAID DRAINAGE MEMBER INCLUDING FLOW CONTROL MEANS AFFIXED THEREON ADAPTED TO PREVENT FLOW OF LIQUID FROM SAID STOCK MIXTURE THROUGH THE APERTURES IN PREDETERMINED AREAS OF SAID DRAINAGE MEMBER, THE NUMBER OF SAID PREDETERMINED AREAS BEING FROM ABOUT 100 TO ABOUT 1,300 PER SQUARE INCH OF SAID MEMBER, WHEREBY FLOW OF LIQUID FROM SAID STOCK MIXTURE THROUGH SAID PREDETERMINED AREAS OF SAID DRAINAGE MEMBER IS PREVENTED; AND C. APPLYING SUCTION TO THE LOWER SURFACE OF SAID DRAINAGE MEMBER TO DRAW LIQUID THROUGH SAID DRAINAGE MEMBER WHILE SAID EDDY CURRENTS EXIST IN SAID STOCK MIXTURE, SAID EDDY CURRENTS SWEEPING AWAY FIBERS FROM AREAS IN SAID STOCK MIXTURE WHICH OVERLIE FLOW CONTROL MEANS TO FORM APERTURES IN OVERLYING RELATIONSHIP WITH SAID FLOW CONTROL MEANS, SAID SUCTION APPLYING A FORCE AGAINST THE FIBERS IN AREAS OTHER THAN SAID PREDETERMINED AREAS FOR HOLDING THE FIBERSS ON SAID DRAINAGE MEMBER IN SAID OTHER AREAS FOR FORMING SUBSTANTIALLY CONTINUOUS FIBROUS WEB PORTIONS, WHEREBY AN APERTURED FIBROUS WEB IS FORMED UPON SAID DRAINAGE MEMBER, SAID WEB HAVING A NUMBER OF APERTURES SUBSTANTIALLY CORRESPONDING TO THE NUMBER OF SAID PREDETERMINED AREAS.
Claim 3
Dependent Claim 66 words
The method according to claim 1 wherein said drainage member is a single member having apertures which are defined by a plurality of aperture-defining continuous surfaces, each of said aperture-defining continuous surfaces extending between and through said upper surface and said lower surface to define said plurality of apertures, including the step of removing said apertured fibrous web from said drainage member through a couch roll.
Claim 4
Dependent Claim 36 words
The method according to claim 1, comprising the additional step of creping said web to form raised, crepe areas, the apices of which include only continuous fibrous web portions to define an outer, exposed, aperture-free surface.

References Cited (Backward Citations)

US2418600A Cited
US2756649A Cited
US2717539A Cited
US2991218A Cited
US3028298A Cited
US3224928A Cited
US3350260A Cited
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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-05-05 1978-11-04 1979-05-06 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-05-05 1982-11-04 1983-05-06 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-05-05 1986-11-04 1987-05-06 $7700.00 Window Closed / Lapsed

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