US3849224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water resistant corrugated paperboard
Assignee: Westvaco Corp
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Filing: 1972-07-21
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Granted: 1974-11-19
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Expires: 1992-07-21
Abstract
Abstract A water resistant corrugated paperboard materail is prepared wherein the paperboard components (medium and liner or liners) are each coated on both sides with a thermoplastic film which acts as a water barrier and a water resistant adhesive for bonding the components together. The corrugated medium is also pre-treated with an internal size treatment to prevent edge wicking, and, for the purpose of corrugating the medium without deleteriously affecting the thermoplastic film, the corrugating rolls are preheated to a temperature slightly less than the melting point of the thermoplastic film while a lubricating material is simultaneously applied to either the corrugating rolls or the medium at the corrugating nip.
Inventors
- 👤 H Hintz
- 👤 J Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:15
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B31F1/28; B31F1/2804; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1016; Y10T156/1021
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
179 words
IN THE PROCESS OF MANUFACTURING WATER RESISTANT CORRUGATED PAPERBOARD, CONSISTING OF AT LEAST ONE LINERBOARD COMPONENT HAVING BOTH SIDES THEREOF COATED WITH A FILM OF THERMOPLASTIC MATERIAL, AND AT LEAST ONE CORRUGATING MEDIUM COMPONENT HAVING BOTH SIDES THEREOF COATED WITH A FILM OF THERMOPLASTIC MATERIAL, THE STEPS OF: A. PRETREATING THE SAID CORRUGATING MEDIUM COOPONENT WITH AN INTERVAL SIZE TREATMENT TO SELECTED FROM THE GROUP CONSISTING OF 0.75-1.0% ROSIN WITH ABOUT 1.5% ALUM, 0.2% STEARIC ANHYDRIDE WITH 0.3-0.4% ALUM OR 0.2% SUCCINIC ANHYDRIDE WITH 0.3-0.4% ALUM TO INHIBIT THE WATER WICKING TENDENCIES THEREOF; B. APPLYING A DIRECT PRE-HEAT TREATMENT TO ONE SIDE OF THE SAID COATED AND SIZED CORRUGATING MEDIUM PRIOR TO ENTERING THE CORRUGATING NIP OF A CORRUGATION MACHINE; C. APPLYING AN INDIRECT PRE-HEAT TREATMENT TO THE OPPOSITE SIDE OF THE SAID COATED AND SIZED CORRUGATING ROLLS OF THE CORR HEATING AT LEAST ONE OF THE CORRUGATING ROLLS OF THE CORRUGATING MACHINE; D. APPLYING A LUBRICATING TREATMENT IN THE FORM OF A WATER SPRAY OF A WATER SPRAY CONTAINING DETERGENT TO THE CORRUGATING NIP OF THE CORRUGTING MACHINE.
Claim 2
Dependent Claim
179 words
IN THE PROCESS OF MANUFACTURING WATER RESISTANT CORRUGATED PAPERBOARD, CONSISTING OF AT LEAST ONE LINERBOARD COMPONENT HAVING BOTH SIDES THEREOF COATED WITH A FILM OF THERMOPLASTIC MATERIAL, AND AT LEAST ONE CORRUGATING MEDIUM COMPONENT HAVING BOTH SIDES THEREOF COATED WITH A FILM OF THERMOPLASTIC MATERIAL, THE STEPS OF: A. PRETREATING THE SAID CORRUGATING MEDIUM COOPONENT WITH AN INTERVAL SIZE TREATMENT TO SELECTED FROM THE GROUP CONSISTING OF 0.75-1.0% ROSIN WITH ABOUT 1.5% ALUM, 0.2% STEARIC ANHYDRIDE WITH 0.3-0.4% ALUM OR 0.2% SUCCINIC ANHYDRIDE WITH 0.3-0.4% ALUM TO INHIBIT THE WATER WICKING TENDENCIES THEREOF; B. APPLYING A DIRECT PRE-HEAT TREATMENT TO ONE SIDE OF THE SAID COATED AND SIZED CORRUGATING MEDIUM PRIOR TO ENTERING THE CORRUGATING NIP OF A CORRUGATION MACHINE; C. APPLYING AN INDIRECT PRE-HEAT TREATMENT TO THE OPPOSITE SIDE OF THE SAID COATED AND SIZED CORRUGATING ROLLS OF THE CORR HEATING AT LEAST ONE OF THE CORRUGATING ROLLS OF THE CORRUGATING MACHINE; D. APPLYING A LUBRICATING TREATMENT IN THE FORM OF A WATER SPRAY OF A WATER SPRAY CONTAINING DETERGENT TO THE CORRUGATING NIP OF THE CORRUGTING MACHINE.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the thermoplastic material is a thermoplastic polyolefin.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein the thermoplastic polyolefin is polyethylene.
Claim 5
Dependent Claim
21 words
The process of claim 3 wherein the polyethylene film thickness is in the range of from 0.75 - 1.0 mil thick.
Claim 6
Dependent Claim
26 words
The process of claim 4 wherein the direct pre-heat treatments for both the corrugated medium components and the linerboard component are in the range of 200*F.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein the temperature of at least one of the corrugating rolls is in the range of from 150*-215*F.
Claim 8
Dependent Claim
19 words
The process of claim 6 wherein the lubricating treatment is applied directly to both sides of the corrugated medium.
Claim 9
Dependent Claim
20 words
The process of claim 7 wherein the lubricating treatment is also applied to the corrugating rolls of the corrugating machine.
Claim 10
Dependent Claim
19 words
The process of claim 10 wherein the additional direct heating treatment is of a temperature in excess of 450*F.
Claim 11
Dependent Claim
66 words
The process of claim 9 wherein subsequent components of the laminate are bonded to the laminate formed by pre-heating the bonding surfaces of at least two of the components to a temperature in the range of about 200*F. and applying additional direct heating treatments in excess of 450*F. at the bonding nip to render the polyethylene film surface on one of the components tacky and bondable.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |