US4770920A
Expired / Lapsed
US
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Lamination anchoring method and product thereof
Assignee: Paper Pak Industries
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Filing: 1986-12-05
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Granted: 1988-09-13
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Expires: 2006-12-05
Abstract
Abstract An absorptive laminated sheet material having improved, moisture-resistant, pressure bonded spots for locking the lamination layers together. During fabrication of the laminated product, a thermoplastic low-viscosity wax-like substance, such as melted wax or paraffin, hot melt plastic or the like, is applied in minute amounts onto juncture lines of pressure bonded spots formed in the pads. The thermoplastic material penetrates the layers of the laminated product so that, on cooling, it forms a "wax rivet" at each bonded spot, thus providing added strength for the juncture lines and rendering the layers impervious to absorbed liquid at the points of application.
Inventors
- 👤 Lionel M. Larsonneur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:41
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/08; B32B7/05; B29; B29C; B29C65/00; B29C65/02; B29C65/40; B29C65/48; B29C65/4805; B29C65/481; B29C65/4815; B29C65/56; B29C65/60; B29C65/601; B29C65/605; B29C65/78; B29C65/7858; B29C65/7888; B29C65/7894; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/20; B29C66/21; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/8351; B29C66/83511; B31; B31D; B31D1/00; B31D1/04; B31F; B31F5/00; B31F5/001; B31F5/02; B31F5/027; B32B27/00; B32B27/06; B32B27/10; B65; B65D; B65D81/00; B65D81/24; B65D81/26; B65D81/264; B29C66/45; B29C66/71; B29C66/731; B29C66/7316; B29C66/73161; B29L; B29L2009/00; B29L2009/001; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1023; Y10T156/1039; Y10T156/1041; Y10T156/17; Y10T156/1798; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T428/24934; Y10T428/249921; Y10T428/249923
Claims Analysis
Total Claims: 49
Claim 1
Independent Claim
104 words
The method of bonding the laminations of an absorptive sheet comprising the steps of: assembling a plurality of absorptive layers and at least one plastic outer layer in close proximity to each other as laminations of sheet material; bonding said layers together at selected spots by selectively applying pressure through the thickness of the sheet material against a backing member to develop a plurality of pressure bonded spots; and applying a wax-like substance at an elevated temperature in liquid form at locations corresponding to said pressure bonded spots so that the liquid substance permeates the laminated layers in the immediate vicinity of said spots.
Claim 2
Independent Claim
104 words
The method of bonding the laminations of an absorptive sheet comprising the steps of: assembling a plurality of absorptive layers and at least one plastic outer layer in close proximity to each other as laminations of sheet material; bonding said layers together at selected spots by selectively applying pressure through the thickness of the sheet material against a backing member to develop a plurality of pressure bonded spots; and applying a wax-like substance at an elevated temperature in liquid form at locations corresponding to said pressure bonded spots so that the liquid substance permeates the laminated layers in the immediate vicinity of said spots.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein the bonding step comprises running the sheet material between a backing member and a serrated wheel for developing longitudinal juncture lines in the material, each juncture line comprising a plurality of individual spots.
Claim 4
Dependent Claim
36 words
The method of claim 1 wherein the step of applying the wax-like substance comprises selectively spraying melted substance from a heated reservoir onto the upper side of the sheet material in line with said juncture lines.
Claim 5
Dependent Claim
39 words
The method of claim 1 wherein the step of applying the wax-like substance comprises selectively depositing melted substance from a heated reservoir onto the upper side of at least one layer of the sheet material along said juncture lines.
Claim 6
Dependent Claim
33 words
The method of claim 4 wherein the melted substance is deposited onto the upper side of a first plastic outer layer which is joined as the bottom layer of the laminated sheet material.
Claim 7
Dependent Claim
60 words
The method of claim 5 further including the steps of assembling a second plastic outer layer on the upper side of the laminated sheet material and selectively depositing additional melted substance from a heated reservoir onto the upper side of said second plastic outer layer to provide reinforcing bonds of thermo-setting compound at locations of said first-mentioned pressure bonded spots.
Claim 8
Dependent Claim
78 words
The method of claim 1 wherein the step of applying the wax-like substance comprises applying said substance to the upper side of a first plastic layer assembled as the bottom layer of the laminated sheet material, and further including the steps of assembling a second plastic layer along the upper side of the laminated sheet material and making a second application of liquid wax-like substance to provide reinforcements of the bonds initially developed at the pressure bonded spots.
Claim 9
Dependent Claim
30 words
The method of claim 4 wherein the substance is a wax having a low viscosity when melted and exhibiting high permeability in the absorbent layers of the laminated sheet material.
Claim 10
Dependent Claim
10 words
The method of claim 4 wherein the substance comprises paraffin.
Claim 11
Dependent Claim
12 words
The method of claim 4 wherein the substance comprises hot melt plastic.
Claim 12
Dependent Claim
13 words
The method of claim 4 wherein the laminated absorbent layers are cellulose tissue.
Claim 13
Dependent Claim
23 words
The method of claim 12 wherein two plastic backing layers are provided as outer layers on opposite sides of the laminated tissue layers.
Claim 14
Dependent Claim
25 words
The method of claim 4 wherein the step of applying the melted substance comprises applying said substance a second time onto the pressure bonded spots.
Claim 15
Dependent Claim
35 words
The method of claim 13 further including the steps of cutting the sheet material into individual pads, each including a significant plurality of wax-like substance-impregnated, pressure bonded spots at distributed locations in each individual pad.
Claim 16
Dependent Claim
37 words
The method of claim 4 wherein the bonding step further comprises forming a plurality of laterally elongated funnels extending from one surface layer of the sheet material to adjacent the opposite surface layer of the sheet material.
Claim 17
Dependent Claim
28 words
The method of claim 15 wherein the bonding step further comprises forming a myriad of tiny openings extending through the compressed laminations at the base of said funnel.
Claim 18
Dependent Claim
24 words
The method of claim 16 wherein the applying step comprises directing said substance in melted liquid form into said funnel in a second application.
Claim 19
Dependent Claim
43 words
The method of claim 17 wherein the second application of the applying step further comprises directing at least some of the melted liquid substance through said openings to develop a layer on the side of the sheet material remote from the funnel mouth.
Claim 20
Dependent Claim
31 words
The method of claim 18 further comprising the step of permitting the wax-like substance deposited within a funnel and extending through said openings to solidify in the form of a rivet.
Claim 21
Dependent Claim
10 words
An absorbent pad produced by the method of claim 5.
Claim 22
Dependent Claim
10 words
An absorbent pad produced by the method of claim 7.
Claim 23
Dependent Claim
10 words
An absorbent pad produced by the method of claim 19.
Claim 24
Dependent Claim
99 words
An absorbent laminated sheet comprising: a plurality of individual absorbent tissue layers arranged as laminations in a stack; a first plastic backing layer along one side of the laminated tissue layers with thermoplastic compound applied between the plastic backing layer and the adjacent tissue layer; respective pluralities of pressure bonded spots arranged in juncture lines extending along said sheet, each bonded spot comprising said tissue layers and said backing layer being compressed tightly together in a localized region to form a compression bond; and means including said compound for structurally reinforcing the compression bond formed at an individual spot.
Claim 25
Dependent Claim
99 words
An absorbent laminated sheet comprising: a plurality of individual absorbent tissue layers arranged as laminations in a stack; a first plastic backing layer along one side of the laminated tissue layers with thermoplastic compound applied between the plastic backing layer and the adjacent tissue layer; respective pluralities of pressure bonded spots arranged in juncture lines extending along said sheet, each bonded spot comprising said tissue layers and said backing layer being compressed tightly together in a localized region to form a compression bond; and means including said compound for structurally reinforcing the compression bond formed at an individual spot.
Claim 26
Dependent Claim
16 words
The sheet of claim 23 wherein said reinforcing means comprise a thermoplastic compound in solid form.
Claim 27
Dependent Claim
25 words
The sheet of claim 24 wherein said thermoplastic compound permeates the tissue layers making up the compression bond in the immediate vicinity of said spot.
Claim 28
Dependent Claim
11 words
The sheet of claim 24 wherein said thermoplastic compound comprises wax.
Claim 29
Dependent Claim
30 words
The sheet of claim 26 wherein said wax is present in the form of a "wax rivet" bonding the outer layers and at least some of the layers in between.
Claim 30
Dependent Claim
13 words
The sheet of claim 24 wherein said thermoplastic compound comprises a wax-like substance.
Claim 31
Dependent Claim
11 words
The sheet of claim 24 wherein said thermoplastic compound comprises paraffin.
Claim 32
Dependent Claim
13 words
The sheet of claim 24 wherein said thermoplastic compound comprises hot melt plastic.
Claim 33
Dependent Claim
31 words
The sheet of claim 27 wherein said wax is present in the form of a "wax rivet" bonding together the uppermost layer and the bottom most layer of the laminated sheet.
Claim 34
Dependent Claim
34 words
The sheet of claim 24 further comprising juncture lines arranged closely together in adjacent pairs, the compression bonded spots of the lines of a given pair being formed from opposite sides of the sheet.
Claim 35
Dependent Claim
29 words
The sheet of claim 32 wherein the thermoplastic compound of the compression bonded spots of the junction lines of a pair is applied from opposite sides of the pads.
Claim 36
Dependent Claim
44 words
The sheet of claim 23 wherein the pressure bonded spots are in the form of laterally elongated funnels aligned in said juncture lines and having a myriad of tiny openings extending through the sheet in a localized region at the base of a funnel.
Claim 37
Dependent Claim
20 words
The sheet of claim 34 wherein the structurally reinforcing means comprise a solidified wax-like substance substantially located within said funnel.
Claim 38
Dependent Claim
34 words
The sheet of claim 34 wherein the structurally reinforcing means comprise a solidified wax-like substance in the form of a rivet situated partially within said funnel and encompassing both opposed surfaces of the sheet.
Claim 39
Dependent Claim
25 words
The sheet of claim 23 wherein the compression bonded spots are formed by perforating the laminations from the side remote from the plastic backing layer.
Claim 40
Dependent Claim
43 words
The sheet of claim 37 further including a second plastic layer arrayed along the side of the laminated stack remote from the first plastic layer, said compression bonds being formed by perforating the laminated stack from the side adjacent the second plastic layer.
Claim 41
Dependent Claim
22 words
The sheet of claim 38 wherein the reinforcing means comprise a second application of thermoplastic compound at the originally formed individual spots.
Claim 42
Dependent Claim
112 words
Apparatus for bonding together the individual layers of an absorbent laminated sheet to make the sheet resistant to delaminating when wet comprising: means for assembling a plurality of individual layers in a laminated sheet including means for assembling a first plastic layer along the underside of the laminated sheet; means for establishing a plurality of compression bonds throughout the individual layers at selected spots along the sheet; and means for selectively applying a thermoplastic compound in a liquid state to the upper side of the plastic layer in line with said spots prior to assembly thereof with the other layers in the laminated sheet in order to render said spots water repellent.
Claim 43
Dependent Claim
112 words
Apparatus for bonding together the individual layers of an absorbent laminated sheet to make the sheet resistant to delaminating when wet comprising: means for assembling a plurality of individual layers in a laminated sheet including means for assembling a first plastic layer along the underside of the laminated sheet; means for establishing a plurality of compression bonds throughout the individual layers at selected spots along the sheet; and means for selectively applying a thermoplastic compound in a liquid state to the upper side of the plastic layer in line with said spots prior to assembly thereof with the other layers in the laminated sheet in order to render said spots water repellent.
Claim 44
Dependent Claim
30 words
The apparatus of claim 40 wherein said bond establishing means comprise a rotatable serrated wheel having projecting teeth for compressing the layers at successive points of contact with the teeth.
Claim 45
Dependent Claim
25 words
The apparatus of claim 41 wherein the selectively applying means comprise means for spraying melted thermoplastic compound along a path tracked by the serrated wheel.
Claim 46
Dependent Claim
26 words
The apparatus of claim 41 wherein the selectively applying means comprise means for depositing melted thermoplastic compound intermittently along a path tracked by the serrated wheel.
Claim 47
Dependent Claim
28 words
The apparatus of claim 43 wherein the selectively applying means comprise means for depositing melted thermoplastic compound only in depressions established by the teeth of the serrated wheel.
Claim 48
Dependent Claim
37 words
The apparatus of claim 40 wherein the assembling means further include means for assembling a second plastic layer as an upper layer of said laminated sheet prior to presenting the laminating sheet to said bond establishing means.
Claim 49
Dependent Claim
42 words
The apparatus of claim 45 wherein said applying means further comprise means for applying the compound from the upper side of the second plastic layer in positions corresponding to the initially established compression bonds to provide a further reinforcement of said bonds.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |