US3886019A — Method of making laminated corrugated paperboard

Claim 1

Independent Claim 220 words

IN THE ART OF MANUFACTURING RIGID-WHEN -WET CORRUGATED CONTAINER-BOARD FROM A PREFORMED WEB OF MEDIUM AND AT LEAST ONE PREFORMED WEB OF LINER, EACH OF WHICH HAS AN OBVERSE FACE AND A REVERSE FACE, THE PROCESSING COMPRISING: I. SURFACE-TREATING THE REVERSE FACE OF THE LINER WEB BY ROLLER APPLICATIONG OF A CONTROLLED AMOUNT OF A MIXTURE COMPOSED OF A CURABLE THERMOSETTING RESIONOUS MATERIAL ENTRAINED IN A VAPORIZABLE LIQUID VEHICLE, AND IMMEDIATELY VAPORIZING AT LEAST A SUBSTANTIAL PART OF THE VEHICLE FROM THE WEB BY HEATING AT A TEMPERATURE AND FOR A TIME LESS THAN THAT REQUIRED TO SUBSTANTIALLY ADVANCE THE CURE OF THE RESINOUS MATERIAL THEREIN, II. SURFACE-TREATING BOTH FACES OF THE MEDIUM WEB BY ROLLER APPLICATION OF A CONTROLLED AMOUNT OF A MIXTURE COMPOSED OF CURABLE THEREMOSETTING RESINOUS MATERIAL IN A VAPORIZABLE LIQUID VEHICLE AND IMMEDIATELY VAPORIZING AT LEAST A SUBSTANTIAL PART OF THE VEHICLE FROM THE WEB BY HEATING AT A TEMPERATURE AND FOR A TIME LESS THAN THAT REQUIRED TO SUBSTANTIALLY ADVANCE THE CURE OF THE RESINOUS MATERIAL THEREIN, III. CORRUGATING THE SURFACE-TREATED AND VEHICLE-VAPORIZED MEDIUM WEB, IV. ADHESIVELY UNITING UNTO A COMPOSITE BOARD THE SURFACETREATED REVERSE FACE OF THE LINER WEB WITH THE CROWNS OF THE CORRUGATIONS ACCESSIBLE AT ONE SIDE OF SAID MEDIUM WEB, V. THEREAFTER CURING THE RESIDUAL RESINOUS MATERIAL IN THE COMPOSITE BOARD.

Claim 2

Dependent Claim 220 words

IN THE ART OF MANUFACTURING RIGID-WHEN -WET CORRUGATED CONTAINER-BOARD FROM A PREFORMED WEB OF MEDIUM AND AT LEAST ONE PREFORMED WEB OF LINER, EACH OF WHICH HAS AN OBVERSE FACE AND A REVERSE FACE, THE PROCESSING COMPRISING: I. SURFACE-TREATING THE REVERSE FACE OF THE LINER WEB BY ROLLER APPLICATIONG OF A CONTROLLED AMOUNT OF A MIXTURE COMPOSED OF A CURABLE THERMOSETTING RESIONOUS MATERIAL ENTRAINED IN A VAPORIZABLE LIQUID VEHICLE, AND IMMEDIATELY VAPORIZING AT LEAST A SUBSTANTIAL PART OF THE VEHICLE FROM THE WEB BY HEATING AT A TEMPERATURE AND FOR A TIME LESS THAN THAT REQUIRED TO SUBSTANTIALLY ADVANCE THE CURE OF THE RESINOUS MATERIAL THEREIN, II. SURFACE-TREATING BOTH FACES OF THE MEDIUM WEB BY ROLLER APPLICATION OF A CONTROLLED AMOUNT OF A MIXTURE COMPOSED OF CURABLE THEREMOSETTING RESINOUS MATERIAL IN A VAPORIZABLE LIQUID VEHICLE AND IMMEDIATELY VAPORIZING AT LEAST A SUBSTANTIAL PART OF THE VEHICLE FROM THE WEB BY HEATING AT A TEMPERATURE AND FOR A TIME LESS THAN THAT REQUIRED TO SUBSTANTIALLY ADVANCE THE CURE OF THE RESINOUS MATERIAL THEREIN, III. CORRUGATING THE SURFACE-TREATED AND VEHICLE-VAPORIZED MEDIUM WEB, IV. ADHESIVELY UNITING UNTO A COMPOSITE BOARD THE SURFACETREATED REVERSE FACE OF THE LINER WEB WITH THE CROWNS OF THE CORRUGATIONS ACCESSIBLE AT ONE SIDE OF SAID MEDIUM WEB, V. THEREAFTER CURING THE RESIDUAL RESINOUS MATERIAL IN THE COMPOSITE BOARD.

Claim 3

Dependent Claim 43 words

The process of claim 1 wherein at least one of steps (i) and (ii) involves transferring discretely metered increments of said mixture from a supply thereof, to and depositing the same upon said webs while the webs are moving relative to said supply.

Claim 4

Dependent Claim 17 words

The process of claim 2 wherein the discretely metered increments are substantially longer than they are wide.

Claim 5

Dependent Claim 39 words

The process of claim 2 in which said liquid mixture is metered by a gravure roll before being applied to the surface of the web, said gravure roll being one of: a. the tri-helicoid type; b. the quad type.

Claim 6

Dependent Claim 37 words

The process of claim 1 in which the quantity of said mixture applied to the reverse face of said liner is substantially equal to the sum of the quantities thereof applied to both faces of the medium.

Claim 7

Dependent Claim 219 words

In the art of manufacturing rigid-when-wet corrugated container-board from a preformed web of medium and at least one preformed web of liner, each of which has an obverse face and a reverse face, the process comprising: i. surface-treating the reverse face of the liner web by printing thereon a controlled amount of a mixture composed of a curable thermosetting resinous material entrained in a vaporizable liquid vehicle, and immediately vaporizing at least a substantial part of the vehicle from the web by heating at a temperature and for a time less than that required to substantially advance the cure of the resinous material therein; ii. surface-treating both faces of the medium web by printing thereon a controlled amount of a mixture composed of a curable thermosetting resinous material in a vaporizable liquid vehicle, and immediately vaporizing at least a substantial part of the vehicle from the web by heating at a temperature and for a time less than that required to substantially advance the cure of the resinous material therein; iii. corrugating the surface-treated and vehicle-vaporized medium web; iv. adhesively uniting into a composite board the surface-treated reverse face of the liner web wiTh the crowns of the corrugations accessible at one side of said medium web; and v. thereafter curing the residual resinous material in the composite board.

Claim 8

Dependent Claim 219 words

In the art of manufacturing rigid-when-wet corrugated container-board from a preformed web of medium and at least one preformed web of liner, each of which has an obverse face and a reverse face, the process comprising: i. surface-treating the reverse face of the liner web by printing thereon a controlled amount of a mixture composed of a curable thermosetting resinous material entrained in a vaporizable liquid vehicle, and immediately vaporizing at least a substantial part of the vehicle from the web by heating at a temperature and for a time less than that required to substantially advance the cure of the resinous material therein; ii. surface-treating both faces of the medium web by printing thereon a controlled amount of a mixture composed of a curable thermosetting resinous material in a vaporizable liquid vehicle, and immediately vaporizing at least a substantial part of the vehicle from the web by heating at a temperature and for a time less than that required to substantially advance the cure of the resinous material therein; iii. corrugating the surface-treated and vehicle-vaporized medium web; iv. adhesively uniting into a composite board the surface-treated reverse face of the liner web wiTh the crowns of the corrugations accessible at one side of said medium web; and v. thereafter curing the residual resinous material in the composite board.

Claim 9

Dependent Claim 33 words

The invention of claim 5 wherein the quantity of resinous material applied to the reverse face of the liner web includes about 3.3 to 3.9 pounds per thousand square feet of said liner.

Claim 10

Dependent Claim 33 words

The invention of claim 5 wherein the quantity of resinous mixture material applied to each face of the medium web includes about 1.5 to 1.9 pounds per thousand square feet of said medium.

Claim 11

Dependent Claim 27 words

The process of claim 1 wherein said thermosetting resinous material comprises 35 to 65 percent by weight of the solution when entrained in the vaporizable liquid vehicle.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-05-26	1978-11-25	1979-05-27	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-05-26	1982-11-25	1983-05-27	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-05-26	1986-11-25	1987-05-27	$7700.00	Window Closed / Lapsed

Method of making laminated corrugated paperboard

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