US1264497A - Moisture-proof package and process of making the same. - Google Patents

Description

S. B. FIELD.

MOISTURE PROOF PACKAGE AND PROCESS OF MAKING THE SAME.

APPLICATION FILED DEC. 14. I917.

Patented Apr. 30, 1918.

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" citiien ofthe United States, residin UNITED STATES PATENT OFFICE.

SAMUEL 1B. FIELD, OF HOLBROOK, MASSACH USET'IS, ASSICNOB TO PNEUMATIC SCALE CORPORATION, LIMITED, OF QUINCY, MASSACHUSETTS, A CORPORATION OF MAINE.

MOISTURE-PROOF PACKAGE AND PROCESS OF MAKING THE SAME.

Specification of Letters Patent.

Patented Apr. 30, 1918.

Application flied December 14;, 1917. Serial No. 207,023.

To all whom it may concern:

Beit known that I, SAMUEL B. From), a at Holbrook, Mass, county of Norfolk, tate of. Massachusetts, have invented a certain new and useful Improvement in Moisture- Proof Packages and Processes of Making the Same, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to an improvement in; moisture proof sealed'packages and in the method of producing the same. The obj ect of the invention is to provide a moisture proof wrapped and sealed package, the wrapping and sealing of which is relatively inexpensive, which is moisture proof under all ordinary exposures to the atmosphere, which is neat in appearance, which is ready for display in its wrapped and sealed condition, and which when sold over the coun ter does not require an additional wrapping but is ready for elivery to the cusmanner both by. the use of relatively cheapn'i-aterial and by economy in the process of wrapping and sealing.

The invention may be applied to a closed packagewhich has first been put up in any ordinary way, as 'for instance putting the goods into an ordinary carton having end forming flaps which are'closed and pasted if desired, or the goods may be put up in a paste board box having a cover, or in a paper bag having the mouth closed by folding the projecting top end of the bag and preferably securing the top in a closed position by paste or tape or string or any other suitable method. The seahng wrapper con-- by the application of heat so that said lining sheet will adhere both to the inner shell itself and to the outer wrapping sheet throughout all portions of the contacting surfaces, and which will become dry and preferably pliable as soon as it is allowed to cool, said substance with which the paper is treated having also the characteristic of making the lining sheet moisture proof.

The invention will be fully understood by reference to the following description when taken in connection with the accompanying drawings and the novel features thereof will be pointed out and clearly defined in the claims at the close of this specification.

In the drawings, Figure 1 is a perspective view of a packa e having the lined wrapper folded about it in tubular form, two of the corners showing the lining sheet turned back from the outer sheet merely to show that there are two .sheets.

Fig. 2 shows the wrapper completely folded on the sides and on the bottom and partially folded at the top.

Fig. 3 is a perspective View showing the completely wrapped and sealed package.

Fig. 4; is a sectional view on line 44 of Fig. 3.

Fig. 5 is a sectional view of a portion of the inner moisture proof or lining sheet of the wrapper before it is combined with the outer sheet.

Referrin now to the drawings, 1 indicates the original unwrapped package which is shown in dotted lines in Fig. 1 of conventional form. This package may be as previously stated a filled carton or a filled paper bag or box of any kind either sealed or unsealed. This may be made of very cheap sheet material, all that is necessary being that it should be sufliciently strong to hold the material until it can be wrapped in the manner provided by the invention.

A sheet of paper 2 which will be ultimately the outside layer of the completely wrapped and sealed package may have on one face thereof any necessary or desired printing which it isdesired to have upon the outside of the finished package. This sheet of paper is spread out flat and there is then laid flat upon this sheet another sheet 3 preferably of the same size and shape as the sheet 2. This sheet 3 is properly prepared before being laid upon the sheet 2. It may be treated after it is cut to the proper shape, or it may be cut from a large sheet which has been treated in a manner which will be hereinafter described and which may be cut up to form blanks of the suitable size. This sheet .3 whether treated individually as a separate blank or while forming a part of a larger sheet just above described is treated as follows. Both faces of the sheet are given a coat of substance, preferably in liquid or pasty form, which has the characteristic of adhering to or permeating the sheet 3 when the coating is applied hot and which dries hard and pliable and remains hard but pliable under any natural conditions of the atmosphere either during the warmth of the summer or cold of the winter, but which when again heated to a high temperature, that is a temperature above any natural condition of the atmosphere at any season of 'the year, will soften so that if pressure is applied to the overlying sheet while the coating is in the softened condition the two sheets will be causedto adhere together, and once having adhered they will not separate without being heated again to the abnormal temperature.

One formula for a suitable preparation to apply to the said inner sheet is as follows:

. one and one-half pounds of Burgundy pitch,

3 ounces of paraffin and eight one-hundredths of an ounce of rosin oil. The Burgundy pitch ismelted first and then the sheet when said mixture is at a temperature considerably above any normal state of the atmosphere, preferably at about 200 Fahn, and then the sheet is allowed to dry. Any

resinous pitch may be used, and-dry rosin may be used as a substitute for pitch, but

it is preferable to use the Burgundy pitch because the melting point is considerably lower than the rosin or other kinds of pitch so that when the sheet is applied to the package in combination with the outer sheet 1 a lower degree ofheat is possible in sealing it than if the Burgundy pitch were omitted.

In Fig. 5 the two surface layers of this preparation upon the sheet 3 are indicated by 4, 4 respectively.

In applying the wrapper, the sheet 3 hav-' ing the upper and under layers 4, 4: is spread flat upon a sheet of the outer layer 2 upon a flat surface, and the package 1 is then .wrapped up simultaneously-in both sheets length of time to thoroughly heat the coating upon the two surfaces of the sheet-3 which in the wrapped package now becomes an intermediate sheet between the package 1 and the outer sheet 2. This heat softens the composition which has been applied to the sheet 3 and under pressure it will adhere to both the inner package and to' the inner sheet 2. When the hot pressure is removed the adhesive coating will dry and make a firm, permanent adhesion between the sheet 3 and both the inner package and the outer sheet.

If desired, instead of folding the wrapper complete before applying any heat, the heat and pressure may be applied to the sides after it is wrapped in tubular form as shown in Fig. 1, then the bottom may be folded a shown in Fig. 2 and that may be sealed by applying the heat and pressure, and then the top may be folded and sealed. This however is a matter of option depending upon the convenience of the operator and upon the sort of heating pressure device which is employed.

While I have given one formula for a preparation which may be used in treating the inner or lining sheet of the wrapper to give it the proper adhesive characteristic and while I have stated also that one of the three ingredients, namely, Burgundy pitch, may be omitted, itis not intended herein to limit the inventionto the use of a preparation according to the formula given either with or without the Burgundy pitch. It is intended that the claims shall be broad enough to cover the use of any suitable preparation which is capable of producing the specified result, namely, any waterproof preparation which is adhesive at a temperatureabove all normal atmospheric temperatures and which is dry at all normal atmospheric temperatures. For instance the natural atmospheric temperature seldom rises above 100 Fahr. and fairly good success would be had with the use of a coating Which might soften at 100 but in a hot climate and especially upon exposure to the sun the atmospheric temperature sometimes rises above 100. It ismuch safer to have the coating made of a preparation which will remain hard and dry until the temperature rises to at least 150 and still safer would be a minimum temperature forsoftening at expense of unnecessarily excessive heat which would also tend to burn the paper.

It is important that the coating on both sides of the inner or lining sheet should be left in a pliable condition as well as nonstickywhen it dries so that in the handling it pliable. If the rosin 'or'some equivalent thereof is omitted and paraflin alone is mixed with the pitch so much paraffin has to .be used that the compound becomes too much of a paraflin compound and it is not sticky enough when hot to give the proper adhesion between the inner shell and the outside wrapper-sheet. If the pa'raflin or some equivalent thereof is not used and if rosin oil alone is used with the pitch to render it pliable so much rosin 011 has'to be used to make-the coating pliable that it makes the mixture non-drying when cool and the coated sheet will always be sticky in normal temperature. The use of both paraffin and rosin oil however keeps the coating in proper condition so that although it is sticky when hot, it is'both pliable and nonsticky when cool or at their normal temperature.

In the process of wrapping and sealing the package according to the present invention there'is absolutely no stickiness whatever in handling the package, the lining itself being dry and unsticky during all parts of the process when it could come in contact with the hands or with the machinery. During the time that it isin a sticky condition due to heat, it is out of hand touch, being .entirely protected .by the outer sheet and after the package is completely wrapped and sealed there is no stickiness whatever on I the outside either under normal tempera tures or when the package is heated suflicient to soften the coating on the lining. The outside appearance of the package is just the same as an un-waterproofed package and although when exposed to moisture, the moisture might permeate the outer sheet of the wrapper until it reached the outer coat ing of the lining, it cannot penetrate the lining, and therefore,'th e contents of the package and the inner shell itself are completely protected.

While I have stated that preferably the lining sheet is coated on both sides with the adhesive preparation so that it may be made to adhere both to the package and to the outer wrappin sheet, fairly good results may be obtain by coating one side only of the lining sheet so that by the application of heat under pressure the lining sheet may be made to adhere either to the outer wrapping sheet or to the package according to whichever side of the lining is coated.

. It is also possible to obtain fairly good results if instead of employing two sheets the intermediate or lining sheet is omitted and a the coating is applied directly to the inner face of the outer or wrapper sheet so that it will be made to adhere directly to the inner shell upon the application of pressure and heat. Neither of the last two, described forms of construction is so desirable or effective as the employment of the lining sheet coated on both sides, but I consider either of such additional constructions to come within the scope of the invention.

The moisture proof lining serves not only to protect the contents of the package against absorption of moisture from the outside, but it also serves to prevent the evaporation of moisture which is contained within the pack Single lined sheet around said closed inner shell, the lining sheet of said wrapper having upon both faces a coating of moisture repellent adhesive material, said coating having the characteristic of being soft and sticky under a high degree of heat above natural atmospheric temperatures and being pliable vand non-sticky under natural atmospheric temperatures, said lining sheet being adhesively attached throughout its surfaces to the contacting portions of both the inner shell and the outer sheet of the wrapper by means of said adhesive coating.

2. A sealed wrapped package comprising an inner closed shell which contains the goods, a wrapper consisting of an inner and an outer sheet wrapped and folded as a single lined sheet around said closed inner shell, the lining sheet of said wrapper having upon both its faces a coating of moisture repellent adhesive material, said coating having the characteristic of being dry and hard under all natural atmospheric temperatures and being soft and adhesive under a high degree of heat above natural atmospheric temperatures, said lining .sheet being adhesively attached throughout its surfaces to the contacting portions of the inner shell and of said outer sheet by means of said adhesive coating.

3. A sealed wrapped package comprisin an inner shell which contains the goods, an a wrapper folded about and sealed to said inner shell, said wrapper consisting of an outer sheet and a lining sheet, said lining being adhesively attached throughout one face to said outer sheet and throughout the contacting portion of its other face to said inner shell by means of a coating of moisture repellent adhesive material on both of said faces, said coating having the characnot exceed at least 100 Fahr.

4. A sealed wrapped package comprising an inner shell which contains the goods, and a Wrapper folded about and sealed to said inner shell, said wrapper consisting of an outer sheet and a lining sheet, said lining being adhesively attached throughout one face to said outer sheet and throughout the contacting portion of its other face to said inner shell by means of a coating of moisture repellent adhesive material on both of said faces, said coating consisting of a composition containing pitch, paraffin and rosin 5. A sealed wrapped package comprising an inner shell which contains the goods, and a wrapper folded about and sealed to said inner shell, said wrapper consisting of an outer sheet and a lining sheet, said lining being adhesively attached throughout one face to said outer sheet and throughout the contacting portion of its other face to said inner shell by means of a coating of moisture repellant adhesive material' on both of said faces, said coating consisting of a composition containing Burgundy pitch, paraffin and rosin oil.

6. A sealed wrapped package comprisin an inner shell which contains the goods and a wrapper folded about and sealed to said inner shell, said wrapper consisting of an outer sheet and a lining sheet, said lining being adhesively attached throughout one face to said outer sheet and throughout the contacting portion of its other face to said inner shell by means of a coating of moisture repellent adhesive material on both of said faces, said coating consisting of a composition containing Burgundy pitch and another moisture repellent substance.

7 A sealed wrapped package comprising an inner shell which contains the goods and a wrapper folded about and sealed to said inner shell, said wrapper consisting of an outer sheet and a lining sheet, said lining being adhesively attached throughout one face to said outer sheet and throughout the contacting portion of its other face to said inner shell by means of a coating of moisture repellent adhesive material on both of said faces in substantially the following proportions, one and one-half pounds of Burgundy pitch, three ounces of paraffin, and eight on e-hundredths of an ounce of rosin oil.

' 8-. The method of forming a moisture proof wrapped and sealed package consisting of folding about an inner shell which contains the goods, a loose lined wrapper consisting of two' sheets, one sheet of which is superimposed loose upon the other sheet before being wrapped, the two sheets then being wrapped and folded as one about the dry and hard under natural atmospheric temperatures and which is soft and adhesive under a high degree of heat above the natural atmospheric temperature, subjecting the outer surface of the wrapped package to heat under pressure of sufficiently high temperature to soften said coating and cause the lining to adhere to both the inner shell and the outer sheet, and then allowing the package to cool.

9. The method of forming a moisture proof wrapped and sealed package consisting of folding about an inner shell which contains the goods, a wrapper having a sheet lining which has on both faces thereofa coating of moisture repellent adhesive material whichhas the characteristic of being dry and hard under at least all temperatures which arebelow 100 Fahr. and which sof- 'tens under a high degree'of heat at a tem lwrapped and sealed package consisting of folding about an inner shell which contains the goods, a wrapper having a sheet lining which has on both faces thereof a coating of moisture repellent adhesive material which has the characteristic of being dry and hard under at least all temperatures which are below 100 Fahr. and which softens under a degree of heat at. a temperature which is at least in excess of 100 Fahr. said coating consisting of a composition containing p'ar aflin and rosin'oil, and a pitchy substance, and subjecting the outer surface of the wrapped package to heat sufficient to soften said adhesive and to pressure while so heated and then allowing the package to cool to a temperature below the hardening point.

11. The method of forming a moisture proof wrapped and sealed package consist-' ing of folding about an inner shell which contains the goods, a wrapper having a sheet lining which when the wrapper 1s being folded is unattached to the outer sheet and which has on both faces thereof a coating of moisture repellent adhesive material which has the characteristic of being dry and hard under at least all temperatures which are below 100 Fahr. and which is soft under a high degree of heat at a tempera-- ture which is at least in excess of 100 Fahr., saidcoating containing Burgundy pitch as one of its ingredients, subjecting the outer surface of the wrapped package to heat suflicient to soften said adhesive and to pressure while so heated, and then allowing the package to cool to a temperature below the hardtemperatures which "are below 100 Fahn' and which is soft under a high degree of heat at a temperature which is at least in excess of 100 Fahn, said coating composi tion containing Burgundy pitch, paraflin and rosin oil, subjecting the outer surface of y the wrapped package to heat suflicient to soften said adhesive and to pressure while i so heated and then allowing the package to cool to a temperature below the hardening point.

13. The method of forming amoisture proof wrapped and sealed package consisting of folding about an inner shell which contains the goods, a Wrapper having a loose sheet lining which has on both faces thereof'a coating of moisture repellent adhesive material which has the characteristic of being dry and hard under at least all temperatures which are below 100 Fahr. and which is soft under a high degree of heat at a temperature which is at least in excess of 100 Fahn, said coating composition containing Burgundy pitch, parafiin and rosin oil in substantially the following proportions, one and one-half pounds of Burgundy pitch, three ounces of paraflin and eightone-hundredths of an ounce of rosin oil, subjecting the outer surface of the wrapped package to heat suflicient to soften said adhesive and to pressure while so heated and then allowing the package to cool to a temperature below the hardening point.

14. A sealed wrapped package comprising a closed inner shell which contains the goods and a wrapper consisting ofan inner and an outer sheet wrapped and folded as a lined sheet around said closed inner shell, one of said sheets having upon at least one face thereof a coating ofmoisture repellent material, said coating having the characteristic of bein soft and sticky under a high degree of eat above natural atmospheric temperatures and being pliable and non- "sticky under natural atmospheric tempera tures, the sheet which is provided with said coating being adhesively attached to the entire contacting surface of the other member I or members of the package.

15. A sealed wrapped package comprising an inner closed shell which contains the goods, a paper wrapper folded around said inner shell and a film of moisture repellent adhesive material between the wrapper and the inner shell, said film having the characteristic of being soft and sticky under a high degree of heat above natural atmospheric temperatures and being pliable and non-sticky under natural atmospheric temperatures, the proximate surfaces of said package which contact with said film being adhesively connected together by said film.

16. A sealed wrapped package comprising an inner closed shell which contains the goods, a paper wrapper folded around said inner shell, and a film of moisture repellent adhesive material between the wrapper and the inner shell, said film consisting of a composition containing pitch, paraflin and rosin oil, the proximate surfaces of said package which contact with said film being adhesively connected together by said film.

In testimony whereof I aifix my signature.

SAMUEL B. FIELD.

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