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Publication numberUS2676745 A
Publication typeGrant
Publication dateApr 27, 1954
Filing dateSep 12, 1949
Priority dateSep 12, 1949
Publication numberUS 2676745 A, US 2676745A, US-A-2676745, US2676745 A, US2676745A
InventorsGeisler William
Original AssigneeWilbro Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Shipping case
US 2676745 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

April 27, 1954 w. GEISLER 2,676,745

SHIPPING CASE Filed Sept. 12, 1949 SOLUTION OF LATEX AND SODIUM SILICATE INVENTOR WILLIAM GEISLER ATTORNEYS Patented Apr. 27, 1954 William Geisler, Tenafly, N. J assignor to Wilbro Corporation, New York, N. Y., a corporation of New York Application September 12, 1949, Serial No. 115,310

This invention relates to shipping cases or cartons such as now almost universally employed for the Shipping of cans, bottles, packaged goods" Such cases or cartons and other commodities. are usually formed from a Single blank of double-faced corrugated paper which is cut and scored to provide four connected side walls with integral flaps to be folded over to form the ends of the carton when erected and packed. Such cartons, when kept dry and properly handled, are quite satisfactory even for heavy loads such as cans of paint and the like, but when the paper absorbs moisture, either from getting wet or in storage in a humid atmosphere, the paper is considerably weakened and is apt to give way, particularly at the score lines where the edges of the can tend to cut through the softened paper.

The object of the invention is to provide a a carton of this standard type wherein the carton is strengthened at the fold lines and is also at the same time rendered resistant to the absorption of water, so that the carton maintains its normal strength under conditions which heretofore have caused the carton to weaken in the manner I have described.

The carton may be strengthened by the method herein described at the fold lines only or throughout the entire surface of one or both faces of the blank. In protecting the score lines only of the carton a solution which serves to toughen the paper is applied to the inner surface of the corrugated board at the score lines.

In the accompanying drawing I have illustrated a carton blank of conventional configuration with its score lines treated in accordance with my invention, and in the legend on the drawing I have recited the ingredients of the applied solution.

The principal ingredient of the preferred toughening solution is latex in the form ofa water emulsion having the proportions of approximately 6()% latex and 40% water. To this is added a water dispersion of clay such as commonly used as a filler in the manufacture of molded rubber articles, the solid content of the dispersion being about 60%. To the mixture of latex and clay there is added a sodium silicate solution which may also have a solid content of approximately 60%. The latex emulsion constitutes about 60% of the toughening solution with the clay dispersion constituting 20% and the sodium silicate solution 15%. The remaining is made up of sulfur about 3%, a, suitable wetting agent, for example, sodium polyacrylic acid, about 1% and a suitable accelera- 2 Claims. (Cl. 22916) tor, for example, a mixture of tetramethyl thiurium disulfide and benzothiosol disulfide. The ingredients are mixed together at room temperature and with the water content above stated, have sufficient fluidity to be applied to the surface of the carton blank by a roll coater of ordinary construction having an applying roller of the desired pattern. The solution may be made thinner for spraying or more concentrated, if desired.

The proportions of the ingredients above speci fied are not critical. Generally speaking, the toughness of the coating, that is, its resistance to puncture and abrasion, is increased by adding to the percentage of latex. The chief function of the sodium silicate is to increase the stiffness of the treated board while the clay serves to give body to the coating which remains on the surface of the carton. However, even where the board itself has ample stiffness and it is desired merely to toughen the board against puncture and abrasion, the sodium silicate is preferably not omitted altogether, as it apparently hardens the coating as well as stiffens the board.-

This compound, when applied to the surface of the board along the score lines in stripes one inch wide in an amount of, say, one pound of solution to square feet of surface, will, after drying, render the board much less water-absorbent in the treated portions than in the other portions, and will also toughen and stifien the board so that its resistance to puncture is greatly increased and its capacity to support a stacking load, particularly when the untreated portions of the board are softened by water absorption, is also greatly increased.

The solution may be applied to the finished blank at the same time that the blank is cut and scored, and may be readily heated to dry and set the solution as the cut and scored blanks are delivered to the stacking mechanism.

The solution may be applied to the entire'surface of the corrugated board on one or both sides after the board is finished, or the solution may be applied to the surface of the paper sheet from which the facings of the corrugated board are made before the board is formed. In either case the board should be heated to vulcanizing temperature after the solution is applied, which may be readily accomplished by feeding the coated sheet, either the paper sheet or the corrugated board, as the case may be, through a conventional heater or the kind employed for vulcanizing rubber solutions applied to textile fabrics.

3 4 Iclaim: References Cited in the file of this patent 1. As a new article of manufacture, a paper carton having portions of its inner surface UNITED TE PATENTS treated with a toughening solution containing Number Name Date latex and sodlum slhcate. 393,899 Haines Dec. 4, 1888 2. A paper carton composed in whole or in part of a sheet of paper board having fold lines f jazi Deventer formed in the board, said fold lines being treated 2,259,035 Gillican Oct. 14, 1941 232:? a solution contammg latex and sodium 5111- 10 2,350,161 Gloor May 30 1944

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US393899 *Jul 10, 1888Dec 4, 1888 Knockdown packing-vessel
US1548776 *Sep 28, 1923Aug 4, 1925Deventer Anna Petro Cramer-VanProcess for preserving or protecting substances or objects
US2050061 *Jul 25, 1934Aug 4, 1936William M MccaskellFiber utensil
US2259035 *Dec 30, 1937Oct 14, 1941Glidden CoRosin package
US2350161 *Jun 30, 1942May 30, 1944Hercules Powder Co LtdSolution of water-soluble cellulose ether
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2954054 *Feb 25, 1957Sep 27, 1960Pack Mfg CompanyReinforced multi-tube structure
US3080102 *Mar 24, 1958Mar 5, 1963Bemis Bro Bag CoValve bag
US3137436 *Oct 11, 1960Jun 16, 1964Int Paper CoPaperboard overlap carton
US3236436 *Jun 27, 1963Feb 22, 1966Reynolds Metals CoGusseted corner carton
US3305383 *Apr 1, 1963Feb 21, 1967Continental Oil CoMethod for fabricating improved liquidcontaining fibrous cartons
US3421678 *Oct 9, 1967Jan 14, 1969Us Plywood Champ Papers IncProfile coated carton
US4586643 *Jun 1, 1984May 6, 1986Weyerhaeuser CompanyReinforced container
US4690835 *Feb 3, 1986Sep 1, 1987Weyerhaeuser CompanyReinforced container
US5085367 *May 3, 1991Feb 4, 1992Ronald CarstensCorrugated cardboard boxes with increased compression strength
US5447270 *Dec 22, 1994Sep 5, 1995Westvaco CorporationLaminations for improved container compressive strength
US7140493Mar 19, 2003Nov 28, 2006International Paper CompanyTongue lock for stackable containers
US7337905Nov 21, 2006Mar 4, 2008International Paper CompanyTongue lock for stackable containers
US8079471Dec 20, 2011Graphic Packaging International, Inc.Carton having protective elements
US8684896Sep 27, 2011Apr 1, 2014Graphic Packaging International, Inc.Carton having protective elements
US20030213836 *Mar 19, 2003Nov 20, 2003Fry Stanley L.Tongue lock for stackable containers
US20070056869 *Sep 13, 2006Mar 15, 2007Tokarski John HCarton having protective elements
US20070151890 *Nov 21, 2006Jul 5, 2007Fry Stanley LTongue lock for stackable containers
US20080029586 *Dec 26, 2006Feb 7, 2008Benq CorporationPaper Box
US20080149654 *Mar 4, 2008Jun 26, 2008Fry Stanley LTongue lock for stackable containers
WO1992019503A1 *Feb 14, 1992Nov 12, 1992Key Tech CorporationCorrugated cardboard boxes with increased compression strength
WO2007033108A1 *Sep 13, 2006Mar 22, 2007Graphic Packaging International, Inc.Carton having protective elements
U.S. Classification229/199, 229/930, 229/5.81
International ClassificationB65D5/56, B65D5/44
Cooperative ClassificationB65D5/445, B65D5/563, Y10S229/93
European ClassificationB65D5/44B2, B65D5/56B