EP0033988A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of making a pattern densified fibrous web having spaced, binder impregnated high density zones
Assignee: Procter and Gamble Co
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Filing: 1981-01-26
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Granted: —
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Expires: 2001-01-26
Abstract
Abstract The invention provides a soft, pattern densified fibrous web such as a paper sheet which web generally comprises a relatively low bond, high bulk, vaulted field and a patterned array of spaced zones of relatively high fibre density, at least a substantial proportion of which dense zones are at least partially impregnated with binder material. The degree of impregnating and bonding in the dense zones may be increased by applying mechanical compression to the impregnated zones subsequent to applying the binder material. A method of making such a web is also disclosed. The method generally entails forming a low bond, pattern densified fibrous web; supporting dense zones of the web on a patterned array of spaced supports; displacing the unsupported portions of the web into the spaces intermediate the spaced supports; and applying a binder material to dense supported zones of the web.
Inventors
- 👤 Peter Graves Ayers
- 👤 John Michael Raley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 17:40
CPC Classifications
D; D21; D21H; D21H27/00; D21H27/02; D21F; D21F11/00; D21F11/006; D21H25/00; D21H25/005
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
69 words
A pattern densified fibrous web comprising a relatively high bulk field having a relatively low fibre density, and a patterned array of spaced zones of relatively high fibre density integrated with said relatively high bulk field, characterised in that at least a substantial proportion of said high density zones are at least partially impregnated with binder material and said high bulk field is substantially devoid of said binder material.
Claim 2
Dependent Claim
69 words
A pattern densified fibrous web comprising a relatively high bulk field having a relatively low fibre density, and a patterned array of spaced zones of relatively high fibre density integrated with said relatively high bulk field, characterised in that at least a substantial proportion of said high density zones are at least partially impregnated with binder material and said high bulk field is substantially devoid of said binder material.
Claim 3
Dependent Claim
39 words
A pattern densified fibrous web according to Claim 1 characterised in that the surface portions of said zones which are impregnated with said binder material constitute from 25 to 75 percent of the corporate surface area of said zones.
Claim 4
Dependent Claim
27 words
A pattern densified fibrous web according to either of Claims 1 and 2 wherein one surface of said web is substantially wholly free of said binder material.
Claim 5
Dependent Claim
26 words
A pattern densified fibrous web according to Claim 1 characterised in that all of said high density zones are substantially fully impregnated by said binder material.
Claim 6
Dependent Claim
45 words
A pattern densified fibrous web according to any one of Claims 1-4 characterised in that said high density zones have a corporate surface area which constitutes from 10 to 50 percent preferably from 20 to 40 percent of the total surface area of said web.
Claim 7
Dependent Claim
74 words
A pattern densified fibrous web according to any one of Claims 1-5 characterised in that it comprises principal web-strength fibre constituent of sufficient average length with respect to the spacing of impregnated high density zones that a substantial fraction of said fibres will have spaced portions thereof disposed in adjacent impregnated high density zones and in overlapping bonded relation with portions of other fibres so that said fibres constitute a strength-skeletal-network of said web.
Claim 8
Dependent Claim
28 words
A pattern densified fibrous web according to Claim 6 wherein the fibres consituting said principal fibre constituent are papermaking fibres having average lengths of 2.0 mm or more.
Claim 9
Dependent Claim
25 words
A pattern densified fibrous web according to either one of Claims 6 and 7 wherein said web has a low degree of interfibre hydrogen bonding.
Claim 10
Dependent Claim
17 words
A pattern densified fibroüs web according to Claim 8 wherein said web incorporates a fibre- debonding material.
Claim 11
Dependent Claim
23 words
A pattern densified fibrous web according to Claim 8 wherein the web comprises papermaking fibres having a low inherent interfibre hydrogen bonding propensity.
Claim 12
Independent Claim
169 words
A method of making a pattern densified, partially impregnated fibrous web comprising a multiplicity of discrete zones of relatively high fibre density in which web at least a substantial proportion of said zones are at least partially impregnanted with a non- fibrous impregnating material, said method comprising forming a fibrous, pattern densified embryonic web having a multiplicity of discrete zones of high fibre density which zones are disposed in a predetermined patterned array, and drying said embryonic web, characterised in that it comprises the steps of supporting said embryonic web on an array of spaced supports so that each of a predetermined sub-array of said zones is juxtaposed one of a predetermined sub-array of said supports, and at least partially impregnating at least a substantial proportion of the supported predetermined sub-array of said zones with an impregnating material by biasing said predetermined sub-array of said supports towards a contacting type impregnating means with said sub-array of said zones disposed between said sub-array of said supports and said impregnating means.
Claim 13
Independent Claim
169 words
A method of making a pattern densified, partially impregnated fibrous web comprising a multiplicity of discrete zones of relatively high fibre density in which web at least a substantial proportion of said zones are at least partially impregnanted with a non- fibrous impregnating material, said method comprising forming a fibrous, pattern densified embryonic web having a multiplicity of discrete zones of high fibre density which zones are disposed in a predetermined patterned array, and drying said embryonic web, characterised in that it comprises the steps of supporting said embryonic web on an array of spaced supports so that each of a predetermined sub-array of said zones is juxtaposed one of a predetermined sub-array of said supports, and at least partially impregnating at least a substantial proportion of the supported predetermined sub-array of said zones with an impregnating material by biasing said predetermined sub-array of said supports towards a contacting type impregnating means with said sub-array of said zones disposed between said sub-array of said supports and said impregnating means.
Claim 14
Dependent Claim
44 words
A method according to Claim 11 wherein said supports comprise outward facing knuckles of a loop of an imprinting carrier fabric, said fabric having meshes in the range of from 4-MD/4-CD to 24-MD/24-CD filaments per centimetre, preferably from 8-MD/8-CD to 20-MD/20-CD filaments per centimetre.
Claim 15
Independent Claim
95 words
A method according to either one of Claims 11 and 12 wherein said web comprises a principal web-strength fibre constituent of fibres of sufficient average length with respect to the spacing of said supports constituting said predetermined sub-array of said supports that after said web is formed a substantial fraction of said fibres will have spaced portions thereof disposed on adjacent supports of said sub-array of said supports and in overlapping relation with portions of other fibres whereby said fibres constitute a strength-skeletal-network of said web with said overlapping portions of said fibres bonded together.
Claim 16
Independent Claim
19 words
A method according to any one of Claims 11-13 characterised in that said impregnating material comprises a binder material.
Claim 17
Dependent Claim
44 words
A method according to Claim 14 wherein said aqueous fibrous slurry comprises a fibrous furnish of sufficiently low inherent interfibre bonding propensity that said embryonic fibrous web would have insufficient integral structural integrity to be self supporting while being impregnated with said binder material.
Claim 18
Independent Claim
49 words
A method according to any one of Claims 11-15 characterised in that it comprises the step of drying said embryonic web in the absence of substantial mechanical compression to an average fibre consistency of from 30 to 95 percent preferably from 60 to 90 percent prior to said impregnating.
Claim 19
Dependent Claim
37 words
A method according to Claim 16 characterised in that said drying is effected in such a manner that the unsupported spans of said embryonic web are dried substantially more than the supported zones of said embryonic web.
Claim 20
Dependent Claim
24 words
A method according to Claim 17 wherein said drying is effected by blow through drying means while said web is supported on said supports.
Claim 21
Independent Claim
56 words
A method according to any one of Claims 11-18 characterised in that it comprises the further step of sufficiently deflecting the spans of said embryonic web disposed intermediate said spaced supports into the spaces disposed intermediate said supports to substantially obviate impregnating said spans when said sub-array of said supports is biased towards said impregnating means.
Claim 22
Dependent Claim
21 words
A method according to Claim 19 wherein said deflection is effected by applying a differential fluid pressure across said supported web.
Claim 23
Independent Claim
32 words
A method according to any one of Claims 11-20 characterised in that it comprises the further step of subjecting said supported zones to substantial mechanical compression after said impregnating has been effected.
Claim 24
Independent Claim
59 words
A method according to any one of Claims 11-21 characterised in that said predetermined sub-array of said supports coacts with an impregnation pattern of said impregnating means so that said impregnating material is applied to only the portions of said zones disposed intermediate registered areas of said predetermined sub-array of said supports and said impregnating pattern during said impregnating.
References Cited (Backward Citations)
No citation records indexed.
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