Patent US3864185A successfully refreshed from Google Patents.
US3864185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making corrrugated paperboard
Assignee: I D Inc
•
Filing: 1972-07-14
•
Granted: 1975-02-04
•
Expires: 1992-07-14
Abstract
Abstract A method of manufacture of double-faced, multiwall, and paired single-faced corrugated boards includes the step of applying a chemical gelatinization temperature depressant to the tips of the flutes of corrugated medium or substrate prior to application of a starch adhesive to the corrugated medium and before the last liner is bonded to the ocorrugated medium. The gelatinization temperature depressant enables use of lower temperatures in the hot plate section where the single-faced board plies and/or last liner are bonded to the corrugated substrate and facilitates use of a starch adhesive with a high total solids content which provides a good wet tack for subsequent handling of the board and minimizes board defects such as warping and washboarding caused by inefficient and uneven moisture redistribution or removal in the hot plate section.
Inventors
- 👤 Paul A Johnson
- 👤 David Adams
- 👤 Hamilton A Pinkalla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:20
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B31F1/28; B31F1/2818; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1016; Y10T156/1021; Y10T156/1025; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
178 words
IN A METHOD OF MANUFACTURE OF DOUBLE-FACED CORRUGATED PAPERBOARD, THE IMPROVEMENT COMPRISING THE STEPS OF APPLYING A COATING OF GEL POINT DEPRESSANT TO THE EXPOSED FLUTE TIPS OF THE CORRUGATED MEDIUM FACED WITH A SINGLE LINER OPPOSITE THE EXPOSED FLUTE TIPS BY CONTACT OF AN APPLICATOR CARRYING THE DEPRESSNAT WITH THE FLUTE TIPS, APPLYING AN ADHESIVE OVER THE COATED FLUTE TIPS WITH AN ADHESIVE ROLLER AND WHEREIN THE COATING OF ADHESIVE ON SAID ROLLER IS SUBSTANTIALLY THICKER THAN THE COATING OF GEL POINT DEPRESSANT ON THE FLUTE TIPS TO CAUSE A SPLITTING OF THE ADHESIVE COATING ON THE ROLLER INTO AN ADHESIVE LAYER ON THE FLUTE TIPS AND AN ADHESIVE LAYER ON THE ADHESIVE ROLLER WHICH ISOLATES THE DEPRESSANT COATING FROM THE ADHESIVE ROLLER AND THE COATING OF ADHESIVE FILM ON THE ADHESIVE ROLLER, INITIATING GELATINIZATION OF THE ADHESIVE STARTING FROM THE INTERFACE OF THE ADHESIVE AND GEL POINT DEPRESSANT OUTWARDLY THROUGH THE ADHESIVE COATING, AND APPLYING AN ADDITIONAL BOARD LAYER TO THE COATED FLUTE TIPS PRIOR TO MATERIAL GELATINIZATION OF THE OUTER EXPOSED SURFACE OF THE ADHESIVE.
Claim 2
Dependent Claim
178 words
IN A METHOD OF MANUFACTURE OF DOUBLE-FACED CORRUGATED PAPERBOARD, THE IMPROVEMENT COMPRISING THE STEPS OF APPLYING A COATING OF GEL POINT DEPRESSANT TO THE EXPOSED FLUTE TIPS OF THE CORRUGATED MEDIUM FACED WITH A SINGLE LINER OPPOSITE THE EXPOSED FLUTE TIPS BY CONTACT OF AN APPLICATOR CARRYING THE DEPRESSNAT WITH THE FLUTE TIPS, APPLYING AN ADHESIVE OVER THE COATED FLUTE TIPS WITH AN ADHESIVE ROLLER AND WHEREIN THE COATING OF ADHESIVE ON SAID ROLLER IS SUBSTANTIALLY THICKER THAN THE COATING OF GEL POINT DEPRESSANT ON THE FLUTE TIPS TO CAUSE A SPLITTING OF THE ADHESIVE COATING ON THE ROLLER INTO AN ADHESIVE LAYER ON THE FLUTE TIPS AND AN ADHESIVE LAYER ON THE ADHESIVE ROLLER WHICH ISOLATES THE DEPRESSANT COATING FROM THE ADHESIVE ROLLER AND THE COATING OF ADHESIVE FILM ON THE ADHESIVE ROLLER, INITIATING GELATINIZATION OF THE ADHESIVE STARTING FROM THE INTERFACE OF THE ADHESIVE AND GEL POINT DEPRESSANT OUTWARDLY THROUGH THE ADHESIVE COATING, AND APPLYING AN ADDITIONAL BOARD LAYER TO THE COATED FLUTE TIPS PRIOR TO MATERIAL GELATINIZATION OF THE OUTER EXPOSED SURFACE OF THE ADHESIVE.
Claim 3
Dependent Claim
96 words
The method of claim 1 wherein said roller is operatively associated with an adhesive reservoir and wherein the coating of adhesive on said roller is substantially thicker than the coating of gel point depressant of the flute tips to cause a splitting of the adhesive coating on the roller into an adhesive layer on the flute tips and an adhesive layer on the adhesive roller which isolates the depressant coating from the adhesive roller and the coating of adhesive film on the adhesive roller which adhesive coating is recycled back to the reservoir free of depressant.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the additional board layer is a second liner.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the additional board layer is a corrugated board with a single liner and a third liner.
Claim 6
Dependent Claim
15 words
A method in accordance with claim 1 wherein said gel point depressant comprises caustic hydroxide.
Claim 7
Dependent Claim
24 words
A method in accordance with claim 1 wherein the adhesive comprises a starch suspension with a total solids content in excess of 40 percent.
Claim 8
Dependent Claim
207 words
In the method of making corrugated paperboard with a double liner, including the step of corrugating a continuous web of corrugated medium to provide a series of flutes therein and applying a first liner to the corrugated medium, the improvement comprising the steps of applying a coating of gel point depressant to the exposed flute tips of the corrugated medium faced with a single liner opposite the exposed flute tips by contact of an applicator carrying the depressant with the flute tips, applying an adhesive over the coated flute tips with an adhesive roller and wherein the coating of adhesive on said roller in substantially thicker than the coating of gel point depressant on the flute tips to cause a splitting of the adhesive coating on thE roller into an adhesive layer on the flute tips and an adhesive layer on the adhesive roller which isolates the depressant coating from the adhesive roller and the coating of adhesive film on the adhesive roller, initiating gelatinization of the adhesive starting from the interface of the adhesive and gel point depressant outwardly through the adhesive coating, and applying an additional board layer to the coated flute tips prior to material gelatinization of the outer exposed surface of the adhesive.
Claim 9
Dependent Claim
207 words
In the method of making corrugated paperboard with a double liner, including the step of corrugating a continuous web of corrugated medium to provide a series of flutes therein and applying a first liner to the corrugated medium, the improvement comprising the steps of applying a coating of gel point depressant to the exposed flute tips of the corrugated medium faced with a single liner opposite the exposed flute tips by contact of an applicator carrying the depressant with the flute tips, applying an adhesive over the coated flute tips with an adhesive roller and wherein the coating of adhesive on said roller in substantially thicker than the coating of gel point depressant on the flute tips to cause a splitting of the adhesive coating on thE roller into an adhesive layer on the flute tips and an adhesive layer on the adhesive roller which isolates the depressant coating from the adhesive roller and the coating of adhesive film on the adhesive roller, initiating gelatinization of the adhesive starting from the interface of the adhesive and gel point depressant outwardly through the adhesive coating, and applying an additional board layer to the coated flute tips prior to material gelatinization of the outer exposed surface of the adhesive.
Claim 10
Dependent Claim
25 words
The method of claim 3 including the step of applying heat to the combined web after the second liner is applied to the corrugated medium.
Claim 11
Dependent Claim
24 words
The method of claim 8 including the step of applying pressure to the web after the second liner is applied to the corrugated medium.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |