Patent US4561918A successfully refreshed from Google Patents.
US4561918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing corrugated paperboard product using a foamed adhesive
Assignee: Bostik Inc
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Filing: 1985-04-25
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Granted: 1985-12-31
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Expires: 2005-04-25
Abstract
Abstract A vinyl acetate ethylene copolymer adhesive obtains the production of a corrugated paperboard product at ambient temperatures without the need for the heat inputs heretofore required. The adhesive is foamed to expand it so that less adhesive material is required to a given quantity of product.
Inventors
- 👤 Paul M. Scharfenberg
- 👤 Kenneth N. Findley, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:45
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/26; B32B3/28; B32B29/00; B32B29/08; B32B7/00; B32B7/04; B32B7/12; B32B7/14; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/24711; Y10T428/24727; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249984
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
81 words
A process for forming a corrugated paperboard product having a corrugated medium fastened to at least one liner, wherein the improvement comprises: providing a water-based emulsion adhesive comprising vinyl acetate ethylene copolymers; foaming the adhesive so provided; applying the foamed adhesive at ambient temperature to the flutes of the corrugated medium; adhering the liner to the medium by means of the adhesive and at ambient temperatures; and applying pressure to opposite sides of the liner and medium until the adhesive sets.
Claim 2
Dependent Claim
81 words
A process for forming a corrugated paperboard product having a corrugated medium fastened to at least one liner, wherein the improvement comprises: providing a water-based emulsion adhesive comprising vinyl acetate ethylene copolymers; foaming the adhesive so provided; applying the foamed adhesive at ambient temperature to the flutes of the corrugated medium; adhering the liner to the medium by means of the adhesive and at ambient temperatures; and applying pressure to opposite sides of the liner and medium until the adhesive sets.
Claim 3
Dependent Claim
17 words
The process of claim 1 further defined as providing an adhesive having from 40 to 55% solids.
Claim 4
Dependent Claim
16 words
The process of claim 2 further defined as providing an adhesive having at least 48% solids.
Claim 5
Dependent Claim
24 words
The process of claim 1 further defined as providing an adhesive having a viscosity in the unfoamed state of 200-700 centipoises at 25° C.
Claim 6
Dependent Claim
22 words
The process of claim 4 further defined as providing an adhesive having a viscosity in the unfoamed state of approximately 300-325 centipoises.
Claim 7
Dependent Claim
28 words
The process of claim 1 wherein the adhesive is foamed such that the resulting foamed adhesive has a viscosity in a range of from 1,000 to 4,000 centipoises.
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein the adhesive is foamed such that the resulting foamed adhesive has a viscosity of approximately 2,000 centipoises.
Claim 9
Dependent Claim
14 words
The process of claim 4 further defined as providing an adhesive including a diluent.
Claim 10
Dependent Claim
16 words
The process of claim 8 further defined as providing an adhesive including water as a diluent.
Claim 11
Dependent Claim
27 words
The process of claim 1 further defined as providing an adhesive including an insolubilizing agent to enhance the water resistance of the bonds formed by the adhesive.
Claim 12
Dependent Claim
11 words
The process of claim 10 wherein said insolubilizing agent comprises oxalaldehyde.
Claim 13
Dependent Claim
16 words
The process of claims 1 or 10 further defined as providing an adhesive including a preservative.
Claim 14
Dependent Claim
16 words
The process of claim 12 wherein said preservative comprises an aqueous solution of 1, 2 benzisothiazolin-3-one.
Claim 15
Dependent Claim
62 words
The process of claim 1 further defined as a method for forming a double faced corrugated paperboard product having a liner on both sides of the medium and wherein the foamed adhesive is applied to the flutes on both sides of the corrugated medium, a liner is adhered to both sides of the medium, and pressure applied to the product without heat.
Claim 16
Dependent Claim
18 words
The process of claim 1 further defined as providing an adhesive having 40 to 60% air by weight.
Claim 17
Dependent Claim
16 words
The process of claim 15 further defined as providing an adhesive having 50% air by weight.
Claim 18
Dependent Claim
20 words
The process of claim 1 further defined as providing an adhesive having a bubble size of 100 microns or less.
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) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |