US1451145A - Manufacture of moistureproof packages - Google Patents

Description

H. G. ECKSTEIN MANUFACTURE OF' MOISTUREPROOF PACKAGES Apr. 1o, 1923.

Filed sept. 26, 1919 Patented Apr. 10, 1923.

UNITED STATES 1,451,145 PATENT OFFICE.

THE CRACKER JACK C0., A CORPORATION. OF ILLINOIS.

MAN/UFACTURE or MoIs'rUanrnoor PACKAGES.

Application led September 26, 1919. Serial No. 326,551.'

To all whom z't Vmay concern: l

Be 'it known that I, HENRY G. EGKSTEIN, a citizen of the United States, and avresident of Chicago, county of Cook, and'State of Illinois, have invented certain new and useful Improvements in the Manufacture of Moistureproof Packages, of which the following is a specification.

The invention relates to the manufacture of waxed paper -packages for. marketing candies, pop-.corn confection and other material readily affected by the absorption of moisture.

A paper package or wrapper containing wax only 'in its fibrous body or having only a slight coat or film of wax which is I'easily cracked or broken, or leaves the libres of the paper exposed, will not effectively prevent the passage of water vapor, but, for efficient protection, the package must-have a substantial, unbroken film or coat of wax extending throughout all -portions thereof including its folds or joints.

The present invention seeks to provide at low cost a waxed paper. package which is .vapor-proof at all points. In accordance therewith, the goods are first enclosed in an inner wrapperv or package, which is preferably in the form of a box or carton of relatively stiif paper board and'suitable for containing loose or granular material such as candies, pop-Corn confection,.or the like.,

The filled inner package is then enfolded in a flexible waxed paper sheet or wrapper and the,y overlapping side and endfolds are securely sealed at all points through themediuln of wax onthe sheet by applying heat and pressure to the folds.v The package, thus wrapped and sealed, is then immersed in a bath of melted paraffin wax, drained and cooled to form a substantial, continuous,

uniform coat or film overall portions of the package. l

In the accompanying drawing, which illustrates the form of package to which theinvention is particularly directed, Figure, 1

is a perspective View of the inner packagel or carton. Fig. 2 1s a perspective vlew of.

the 'finished package.; and, Fig. 3 is a. detail section thereof.

The inner wrapper or package containing the goods and which'is to be rendered vaporproof, should be of regular form and present smooth, comparatively rigid surfaces to serve as a suitable support or form over which -the flexible waxed'sheet or wrapper can be readilyA folded and securely sealed. Preferably, as stated, the .inner wrapperor carton-is formed of stiff pa er-box-board.

and comprises. a rectangular ody l having 'end fiaps 2 which are Vfoldedinwardly to en- HENRY G. Ecxs'rEIN, or CHICAGO, ILLINOIS, AssI'GNoR, BY MESNE ASSIGNMENTS, To .I

ily waxed. Preferably manila or bleached sulphite paper weighing from twenty to thirty-five pounds per standard cream bei fore waxing is employed and the paper carries sufiicient parafiin wax, say from ten to thirty pounds per ream, to provide a heavy surface coat of wax on both sides of the sheetin addition tothe wax in its body,

so that all portions`of the folds of the wrapper can be readily andefiiciently sealed by the `application of heat and pressure'. The.

waxed sealing wrapper is folded about the inner filled package' to completely enclose the same, and the overlapping side and end foldsA 4 and 5 of the wrapper are heated to partially melt the wax coat and are pressed into snug contact until the melted wax is cooled andset to seal the folds. e

The wrapped and sealed package is then dipped in a'bath of melted paraffin for a few seconds. After removal from the bath, ex-

cess wax is allowed to drain from the package and it is cooled by exposure to the air orto a 'cooling air blast to set the wax and form a uniform, continuousfilm over all portions of the package. Paraffin wax having a. melt- Iing oint of about 128o or 130 F. is preferab y employed and the bath should` be maintained' at a temperature `of about 150o to 160 F., care being taken' that the temperature be lhigh enough to insure proper drainage of the packages after removal from the bath and valso Vto avoid excessive temperatures vwhich would tend to open the sealed folds of the packages. f

By dipping the package as described,y a

.coat or film tothe extent of about lzl to 29;

pounds pei` 100 square feet will be added, and,`since the package has been previously enfolded and tightly sealed in a parafiined wrapper having a surface coat, the added wax cannot penetrate or be absorbed by the walls ofthe package or seep in through its' folds or joints. Nor'v will it form a film which can be readily broken or chipped off.

lll)

. Instead the additional wax will firmly unite or become fused or bonded with the wax already on the surface of the Wrapper to form a heavy superficial coat which will seal up all minute cracks and imperfections in the sea-ling wrapper and Vcover any portion of its film which may have been impaired by..

the heating and sealing of the folds. Furthermore, where a previously waxed wrapper is employed, the "amount o-f wax added by ldipping can be more readily cont-rolled and more effectively and economically employed to provide a uniform film or coat than would be possible if an unwa-xed, glued or pasted wrapper were used. In Fig. '3 vof the drawingv the black line 6 indicates the wax coat on the inner surface Iand between the folds of the wrapper and theheavier line 7 is intended to indicate the film formed by its outer coat and the wax added thereto by the dipping operation and which extends over the entire surface of the package, including the side and end folds.

The folding, sea-ling and dipping operations may be carried out in various Ways, but preferably by suitable machinery. In dipping, the entire package is preferably immersed, but if the wrapper is originally provided with a heavy surface coat or film on both sides, good results can be obtained by dipping the end portions only to thereby thoroughly protect the end folds.

When the package is Withdrawn from the bath of melted paraffin, excess wax is drained off, as stated, preferably by holding the package for several secondcsr.. in such a tipped or inclined position thatone corner point thereof is lowermost. In this way, the excess wax readily collec-ts and falls from the lo-wermost corner point of the package and thus aids in effecting the uniform disposition of the added Wax. Usually, to protect thefinished package from injury, it will be inclosed in an outer pasted Wrapper of heavy paper or paper board.

The details set forth may be varied with- Y out depart-ure from the essentials of the invention as defined in 'the claims.

I claim as my invention:

1. The method of vapor-proofing packageswhich consists in enfolding the goods in vaflexible waxed paper wrapper the wax on which may at times be partially destroyed in the operation of sealing the package, then applyin heat and pressure to the'overlapping folcIs of the wrapper to seal thev same by the wax thereon, and subsequently restoring a film of wax to any such denuded surfaces of the wrapper to provide a substantial, continuous film over all portions ,of the package.

2. Themethod -of forming filled vapor- Lamu-ia the goods in an vinner wrapper to form an inner package of regular form and having smooth, substantially rigid sides and ends, enfolding the same in a flexible paper wrapper heavily coated with wax, the wax on which may at 'times be partially destroyed in the operation of sealing the packyage, applying heat and pressure to the sides and end folds of the wrapper to seal the fsame by the contained wax and subsequent- `ly immersing the -package in melted Wax and draining and cooling the same to provide a substantial, continuous film over all portionsof the package, substantially'as described. v

3. The method of vforming a `vapor-proof package which consists in enclosing the goods in a box of stiff material, and enfolding the same in a heavily waxed paper wrapper the wax on which may at times be partially destroyed in the operation of'` sealing the package, then applyingl haalt. and pressure tothe side and end folds of said wrapper to seallthe same by the containedwax, and subsequently dipping ,the package in melted Wax to provide a substantal, continuous film over all portions of the package, substantially as described.

4. The method of vapor-proofing packages which -consists in enclosing the con-v tents in a foldable Wrapper havinga surface film ofwax enclosing the paper against the entrance of moisture to the body of the paper but which film may at times be partially destroyed in the operationof sealing the package, then applying heat and pressure to the overlapping folds of the wrapper to melt the wax thereon and seal thesame therewith, and dipping the package 'in melted wax to re-lm any'portion of the surface from which the wax may have been displaced in the operation -of sealing.

5. The method offorming filled vaporproof packages which consists in enclosing the contents to form an inner package, enclosing said inner package in an outer ,wrapper-of foldable paper having a surface film o-f wax sealingsuch outer wrapper

Images