US2661141A

US2661141A - Laminated carton

Info

Publication number: US2661141A
Application number: US5918A
Authority: US
Inventors: Jr Julius A Zinn
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-02-03
Filing date: 1948-02-03
Publication date: 1953-12-01
Anticipated expiration: 1970-12-01
Also published as: US2542298A

Description

J. A. zlNN, JR

LAMINATED CARTON Dec. 1, 1953 4 Sheets-Sheet l Original Filed Feb. 5, 1948 f, RJ, i @QW m m N m. mZ

. l im um M 5 m m 1% y :NNUHNNHNHNNIMMHHI J B \\Q% KGN 41% rilllli J iE 1 1l. vnwmmmwmwwwN-W) Rw Sw s, mw @uw $3@ w www N TLN J. A. ZlNN, JR

LAMINATED CARTON Dec. l, 1953 4 Sheets-Sheet 2 Original Filed Feb. 3. 1948 Z 63 i364 35126 7 /Z/ga/ fc ill/lll.:

Dec. l, 1953 J. A. zlNN, JR 2,661,141

LAMINATED CARTON original Filed Feb. s, 194s @sheets-sheet s U 5l 6g 30 63 5@ L, j l: E wg; f V l l JL F #2 y 6-8 7@ j] /J r 5;. @1

7 4@ Q@ 5 lijf :3W 47 j /ll7 /"?3\ r--H'fl f -w 41 2 D l HEM als 0C 3 1N V EN TOR.

J. A. ZlNN, JR

LAMINATED CARTON Dec. 1, 1953 4 Sheets-Sheet 4 Original Filed Feb. 3, 1948 BY @my Q/-yw Patented Dec. 1, 1953 UNITED STATES PATENT oFElcE 3, 1948, Serial N0. 5,918

3 Claims. (Cl. 229-37) The present invention relates to improvements in packaging blanks and more particularly to an improved laminated packaging blank which is adapted to be formed into a sealed sift proof and liquid retentive package. This application is a division of applicants copending application Serial No. 5,917, filed February 3, 1948, now Patent No. 2,542,298.

The value of employing sealed containers in packaging certain consumer commodities, particularly liquids and foods, has long been recognized in the packaging art. Such containers must be sift proof, air and moisture tight and when designed to contain liquid commodities, must also be impervious to the packaged liquid. Paper containers or packages designed to meet these requirements are generally of two types, i. e., those which are coated with wax or another sealing materialafter the cartons are formed, and those constructed of a laminated stock consisting of an outer backing material, usually cardboard, laminated with an inner lining material, such, for example, as a metallic foil, waxed paper, a plastic foil or lm, or the like, which is relatively much more impervious to air, moisture and liquids generally, than the outer backing material. Known packages of the latter type have not been satisfactory for the reason that in the formation of the blank into a package, certain operations are necessarily performed which result in air and uid leakage paths being inadvertently formed through various wall sections of the completed package. Thus, when prelaminated stock is used in making the package blanks, it is almost impossible to form the necessary fold lines on the stock and then fold along these lines to form the package, without breaking or tearing the lining lamination at points along these lines. Moreover, many of the liner materials having the most desirable characteristics from the standpoint of the sealing and non-contaminating properties thereof, are extremely impervious and hence are very diicult to adhere together or to any other surface. As a result, if such lining materials are used, there is great likelihood of package failure at the junction surfaces of those portions of the package blank which are overlapped and adhered together as the package is formed, this for the reason that at least one layer of the lining material is always interposed between the overlapped sections of the backing material throughout such overlapped portions of the blank. Further, certain edges of the usual package blank are always exposed to the package contents after the blank is formed into a package Divided and this application February and filled. This means that if a laminated blank is used, certain raw edges of the outer paper backing material are exposed to the package contents, with the result that if the package is liquid filled, the liquid may be absorbed into the backing material and cause package failure. Because of the above-mentioned disadvantages, such laminated packages as have been produced commercially have been quite expensive and have never been found entirely satisfactory for use in packaging liquids.

It is an object of the present invention, therefore, to provide an improved laminated packaging blank which may be formed into a package without introducing the above-mentioned defects into the completed package.

It is another object of the invention to pro-` vide an improved laminated packaging blank having a structure such that it may be easily formed into a completed package of sturdy construction without damage to the lining material.

It is still another object of the invention to provide an improved laminated packaging blank of such construction that when formed into a package, the inner lining material lamination itself effectively comprises a completely sealed container which is rigidly reinforced by the formed backing material lamination.

The invention, both as to the present improved blank and the method of forming the same into a package will best be understood by reference to the following specification, taken in connection with the accompanying drawings, in which:

Fig. 1 is a plan view illustrating a packaging blank formed in accordance with the present invention, as seen from the lined side thereof;

Fig. 2 is a plan view of the blank shown in Fig. 1 illustrating the surface areas of the blank to which an adhesive material is applied prior to formation of the blank into a package;

Fig. 3 is a sectional view taken along the line 6 6 in Fig. 2, illustrating in exaggerated thickness the laminated structure of the blank;

' Fig. 4 is a plan view of the completed blank as seen from the backing material side thereof; Fig. 5 is a plan view of a completed blank as seen from the lining material side thereof, illustrating a different mode of perforating the lining material of the blank;

Fig. 6 is a perspective View illustrating one of the first steps involved in forming the blank shown in Figs. 1, 2, 3 and 4 into a package;

Figs. 7 and 8 are fragmentary perspective views illustrating certain steps which are successively 3 performed in forming the bottom end closure of the package;

Figs. 9 and 10 are fragmentary perspective views illustrating successive steps in the formation of the top closure of the package; and

Fig. 11 is a fragmentary sectional view illustrating the manner in which certain edges of the blank shown in Figs. 1, 2, 3 and 4 are sealed aga-inst liquid penetration.

In general, the improved laminated package blank herein disclosed is formed in the manner Y disclosed and claimed in applicants copending application Serial No. 5,917, filed February y3, 1948, now Patent No. 2,542,298. In accordance with one feature of the present invention, 'a

laminated package blank is provided in which only the lining material is perforated over those areas of the blank which are adapted v.to be facingly engaged and adhered together informing the blank into a package, thereby to obviate the above-described problem of obtaining la secure bond between twoA facing lining material surfaces or between facing surfaces of the lining material and backing material. k 1 ticular instances where portions `of the blank are overlapped to sandwich two layers of lining material between two pieces o'fbacking material, the. perforations through` the two engaging layers of lining material are arranged to'regSlJer with each other, thereby 'to permit direct adherence ofthe overlapped pieces of backing material together. In this regard, it is noted that the term perforation, as used herein with particular referenceto the lining material ofeach blanlnis intended broadly to cover any and all types of openings of whatever size and configuration (such forl example, as round, oval, rectangular, or square) which will permit overlapped'segments of the backing material to be directly adhered A together in forming the blank into a package. In accordance with another feature ofthe invention, the lining material of each blank adhered-to the backing materialmonly over areas which are marginally spaced from the score or fold lines of the blank, thereby to prevent the lining material 4from fbeing torn or punctured as the blank is folded into the desired package configuration. In accordance with a further feature of the invention, those edges of the blank vwhich are adapted to be exp-osedto the package, contents upon formation of the blank into a package are sealed by impregnating the same with a suitable sealing material; this forV the purpose of preventing liquid absorption into the backing material when the blank is formed into a package'and filled with aliquid or any material having aA liquid constituent. According to still another feature of the invention, the present improved blank is provided with 'oppositely directed score lines which facilitate opposite direction bending along different ones of the lines in forming the blank into a package. Y

Referring now to the drawings and more particularly to Figs. 1, 2, 3 and 4ther`eof,.the presentv improved laminated package blank there illustrated is adapted to be used in the construction of packages or cartons of theimproved construction disclosed'and claimed in'Zlnn Patent No. 2,412,666, granted December 1'7, '1946.

Briefly, the blank comprises a backing material lamination l of heavy paper,'a composite 'or laminated paper or semi-stiff cardboardvor 'the like, and a liner or lining material lamination l ll whichis of the same vsize and configuration as! In those 'parf the backing material lamination and is adhesively bonded to the backing material lamination over the specific areas described below by means of a layer of adhesive material 9. The lining mate- 5 rial lamination Il is liquid repellent and impervious to air and may consist of cellophane, any of the well known liquid-repellent plastic films, such, for example, as Pliolm, or a metallic film such as tin foil oraluminum foil, depending upon the particular use to which a package formed 4from the blank is to be put. In conguration, the blank, is; similar to that disclosed in applicants prior Patent No. 2,412,666 granted December 17,

1946. As there described and again referring Ymore particularly to Fig. 1 of the drawings, each blank comprises'a main body portion 40, a bottom closing portionll, and a top closing portion 42. The body portion of the blank comprises a side wall panel 43,

end wall panels

44 and 45, and

side panel members

46 and 41 which are arranged to be adhesively joined to form a two-ply side wall panel of the character illustrated in Figs. 7 and 8 of the drawings. The bottom closing portion 4| 'of the blank comprises a side flap member 49, end 'fiap membersi and'l and

side flaps

52 and 53 which are arranged to be overlapped and adliesively joined to form a two-ply flap of the character illustrated in Figs. 7 and 8 of the drawings. The'side

flap members

52 and 53 are respectively provided with integral side wings `.54 and 55 respectively separated from the end flap members 50 and 5I along the severance lines 430o and o. Similarly, the side flap member 49 is provided along opposite ends thereof'with integral wing parts 56 and 5l which are separated from the adjacent end flap members 50 and 5l alongV the severance lines 30h and 30e. Each of the side and end ap members49, 50, 5|,H52and 53 is effectively hinged to the body portion 40 of the blank along the lowermost one of a plurality o f score lines 33h which extend longitudinally of the blank. Similarly, the side flap

member wing parts

54, 55, v56 and 5l are effectively vhinged -to the

side fiap members

52, 53 and 49, respectively, along score lines 33a. which extend transversely of the blank. These wings are foldably hinged to the endflap members l50 and 5| along the

score lines

33g and 33h, which as shown, extend from the upper ends of the severance lines 30h and 39o to the 'adjacent points of intersection betweenthe respective adjacent score lines 33a and 33o. The described score lines 39g and 33h are disposed at degree angles with respect to the score lines 33a. and 33D.

The parts forming the vtop closing portion 42 of the blank are formable intoa bellows-fold type of top" closure and comprise end wall parts 88 and 69 providedWith-

score lines

33d and 33e for facilitating formation of the bellows-folds, a side wall part 19,1and side v'lallmembers 'H and 12 `whichrare arranged to be adhesively joined to form a two-ply upper sidewall in forming the blank into a package. The side and end wall .parts'of the topclosure blank portion 42 are respectively provided with

mouth closing panels

59,10, El, E2, 63, 64,'and 65 which are arranged to be folded and`brouglit together in the manner explained below to form Van upstanding and elongated mouth structure of the character shown in Fig. 10 of the drawings. The mouth closing'panels'B and B5 are respectively provided with extended tab wings 66 and 6l arranged to be adhesively joined to form a'folding ap which encloses the elongated mouthfstructure ofthe n package in the manner illustrated in Fig. of the drawings. As will be evident from inspection of Fig. 1 of the drawings, the panels B8, 69, 10, H and 12 are hingedly connected to the main body portion 40 of the blank by means of the middle score line 33h. The mouth `closing

panels

59, 30, 6I, 62, 63, 64 and 65 are hingedly connected to the blank parts 1-I, 68, 10, `59 and 12 by means of the upper score line 33h. Vertically, the top closure parts of the blank are hingedly connected 4by means of the vertically extending score lines 33a. Inward folding of the

end panels

68 and 69 and connected

mouth closing panels

60, 6I, 63 and 64 is facilitated by the vertical score lines 33e which extend vertically downward from the top edge of the blank to ther points of intersection of the

score lines

33d and 33e. The score lines 33 f serve hingedly -to connect the

folding tabs

66 and 61 to the mouth closure panels l59 and 65 respectively.

All of the score lines are formed in the backing material lamination I0 prior to lamination of this material lamination with the lining material lamination II. As will be apparent from the following explanation with reference to the manner of forming the blank into a package, excepting three steps, al1 folding steps required in forming the top and bottom closure structures of the package involve bending the blank about the described score lines in such a direction that the outside of each bend is at the outer backing material side of the blank. On the other hand, the bends made along the

score lines

33e, 33d, 33e, and 33g and 33h involve reverse bending of the stock in forming the blank into a package. In accordance with one feature of the present invention, the

score lines

33a, 33h, and 33j are formed to bulge upwardly from the lining material side of the blank, whereas the

score lines

33e, 33d, 33e, 33g and 33h are formed to bulge in the reverse direction. In this way, the score line depressions are such that each and every folding operation involved in forming the blank into a package is effected by bending the backing material of the blank around the score line depressions. This has the eiect of minimizing the likelihood of tearing the backing material of the blank as the folding operations involved in forming the blank into a package are performed.

In accordance with another feature of the invention, the lining material lamination II of the blank is perforated over those areas thereof, illustrated in Fig. 1 of the drawings, which are adapted to be brought into facing engagement and adhered together in folding the blank into a package, with certain of the perforations being adapted to be brought into registry as certain of the folding operations are performed. More specifically, the blank is perforated as indicated at 31 only within the confines of the border lines 38. These border lines are within the areas of the blank which are brought into facing engagement and adhered together in forming the blank into a package. The particular conguration and size of the perforations 31 is of no importance. For example, the perforations may be in the form of small round holes as predominantly shown throughout the various figures of the drawings. Alternatively, the perforations 31 may be in the f-orm of elongated slots of rectangular configuration, as shown in Fig. 5 of the drawings. While the particular configuration of the perforation openings is of no importance, the positional relationship of certain of these openings with respect -to each other is of great importance. Thus, the purpose of providing such openings is to permit direct adherence of facing segments of the backing material together through the perforation openings as the blank is formed into a package. Over those areas of the blank where two thicknesses of the lining material are sandwiched between overlapped portions of the backing material in forming the blank into a package, it is necessary, in order to realize the desired end of obtaining a direct adhesive connection between the overlapped segments of backing material, to so position the perforation holes 31 that the holes through the two engaging layers of lining material are in registry. In constructing a blank of the character shown in Fig. 1 of the drawings 'which is adapted to be formed into a package of the type shown in Figs. 6 through l0 of the drawings, this requirement of perforation hole registry involves the perforation holes 31a, 31o, 31o, 31d, 31e, 31f, 31g, 31h, 31k, 31m, 3111., 31o, 31p, 31s. More specifically, the perforation holes 31a and 31o are adapted to register with the perforation holes 31b when the blank is formed into a package. Similarly, the holes 31d and 31j are so positioned as to register with the holes 31e as the bottom closure parts of the blank are folded and overlapped incident to formation of the blank into a package. As regards the top closure parts of the blank, the perforation holes 31g and 31h are so positioned as to register with each other, and the holes 31k and 31m are likewise positioned to be brought into registry. At the other end of the top closure structure, the holes 3111. are adapted to register with the holes 310 and the holes 31p are arranged to be brought into registry with the holes 31s. Further, each of the

score lines

33o, 33g and 33h and the right end of the upper score line 33h has at least one perforation hole 31 centered thereover in the lining material I I of the blank. Aside from the described posi tional arrangement of certain of the perforation holes, it is pointed out that all perforation holes are marginally spaced back from the boundaries of those areas of the blank which are overlapped and adhered together in forming the blank into a package. This is clearly illustrated in Fig. 2 of the drawings, wherein the perforated areas within the dashed lines 38 are shown in superimposed relationship with the areas of the liner lamination side of the completed blank to which the adhesive is applied for the purpose of adhering overlapped parts of the blank together as the blank is formed into a package. The purpose of thus marginally spacing the outer boundaries of the perforated areas of the lining material back from the boundaries of the blank to which adhesive is applied during the package forming operation, is that of insuring a continuous adhesive seal along these marginal strips which separate the perforated lining material areas from the inside of the formed package. This seal serves the purpose of rendering the package sift proof and preventing a liquid with which the package may be lled from penetrating the outer backing material I0 by way of the perforation holes.

In accordance with another feature of the invention, the lining material lamination I I of the blank is not adhered to the backing material lamination I0 within the strips dened by the margin lines 35 on either side of each score line, and the surfaces of the backing material I0 exposed through the perforations 31 are not covered with the adhesive layer 9. -Preferably the margin lines 35am spacedfromtheedges of the adia; cent score lines a distance which may range from one-sixteenth to one-eighth of an inch. The purpose of not adhering the lining material H to the backing material I over these zones is to render those portions of the lining material which overlie the score lines 0f the backing material freely movable relative to the backing material and hence to prevent these portions of the lining material from being subjected to sharp bending and excessive strains as the completed blank is folded into package form. The purpose of not adhesively coating the areas of the backing material which register with the lining mate rial perforations 31 in laminating the two materials together is that of preserving clean backing material surfaces to which adhesive material may be applied to the blank as a preliminary step in forming the completed blank into a package. In other words, it is not desirable. to coat these surfaces of the backing material with the adhesive employed in the laminating step, allow these adhesive coated surfaces to set, and then re-.coat the same surfaces with a ysecond adhesive material during the package forming operation, for the reason that it is diicult to obtain a satisfactory bond between the adhesive material applied during the package vforming step and .the adhesive material applied immediately before the Vlaminating step.

In accordance with still another feature of the invention, certain edges .of .each blank .are impregnated with an air-drying sealing material or compound over only those edges thereof which are adapted to be exposed .tothe package con# tents when the blank is formed into a .package and lled. As will be evident from the following description of the mode of r.forming the blank into a package, only those .edges identified at .30e in Fig. 1 of the drawings are adapted .to be .ex posed to the package contents .and hence require impregnation with a sealing material to prevent liquid penetration of the backing Amaterial lamination Il). Preferably, an air-,drying liquid sealing'compound, such, 'for example, .as .GlyptaL having good qualities .of stock penetration, is employed in sealing the blank edges. TheA sealstructure is illustrated in exaggerated form .in vFig. 11 of the drawings. As there shown, the sealing material penetrates the backingmaterial ,Ill -for an .appreciable distance inward from the ,edge e and effectively forms a clip 30j which binds the edge of the lining materiali I to the adjacent edge of the backing material Ill to prevent separation of these ktwo materials along the edges Sile of the blank.

In order to adhere `certain panels df thetop closure portion 42 ofthe blank together as .the blank is formed-into a package, a 'thermoplastic adhesive material is applied'to the strip areas 39a and .39D disposed upon opposite sides .of .the blank after the materials 1^!) and [I'l Qf vthe'lilalk are laminated together. As shown inFigs.. 2 .and 3 ofthe drawings, these areas coincide with each other along opposite sides of 'the end closure parts Ellfol, 62, *53 and 64. Certain ofthenllter surfaces Yof the blank, such, for example, as the surface areas '3i and 32,'may, if desiredfbe used for printing identification or advertising material. Such printing is preferably performed .on lthe backing material I0 in advance oflaminating ,this material with the lining material LI In forming the described blankintoa package in the manner .disclosed ,and -claimed in ,applicants copending application Seralahlo.` 612,1???

8. filed August .23, 1,945, now Patent No. 2,480,176, the blank is first fed through an adhesive stencilling device, wherein the liner lamination side thereof is stencilled with an adhesive coating over the stippled areas of the blank as shown in Fig. 2 of the drawings. As previously pointed out, the boundaries 38 Within which the liner perforations are confined are marginally spaced inward from the boundaries of the areas to which the adhesive coating is applied in order to insure adhering of an unperforated portion of the lining material -to the backing material or another unperforated and facing portion of the lining material incident to the package forming operation. After the adhesive coating is applied to the indicated surfaces of the blank, it is delivered to the forming facil.- ities of a package forming machine where the side and vbottom closure structures are made. The rst operation performed in this machine is that of wrapping the blank around a forming mandrel to bend the same along the score lines `33a in the manner illustrated yin 6 lof the drawings .until the adhesively perforated lining material side of the bla-nkparts 67, 155, i2, 47 and 53 is brought into facing engagement with .the backing mate.-

rial side of the parte ft, 59,111, 46 Aend-5l `respectively. By a suitable pressure application, .the identified facingly .engaged parts of the blank yare obviously adhered together, thus .completing for.- rnation ofthe side and end Wall structure of the package. It wiil .be understood `that `the backing material laminations of the overlappedparts are directly adhered together :through 'the perforartions 37 in the lining material lamination .disposed between Vthe two .overlapped parts .of the ,backing material.

In forming .the hottomclosure:structure of the package, .the twofply .end panel consisting of :the adhesively connected blank parts 52 and :53is1irst pushed. inwardly around .the bottom score line hinto the ,plane/of thefbottom yend vof the pack age, following which the bottom side panel .49 is folded inwardly along :the same score vline 33h until it facingly.engages the lhacking side r`o1' fthe panel 54a; `Incident ,to .these foldingoperations, the wing parts ed and 55 of the 'blank are drawn in with :the bottom closureipanel 54a to bringthe lining material .sic-les thereof into .facing engagement `with the lining material sides `of vthe end flap members :5d and` 5l, respectively. This -is the nrst point v,in .the package forming .operation at which two .lining material sidesiof the blank are' brought. into :facing engagement and Vadhered 1to` gether. However, Yand as .previously pointeduout, the lamination V.perforations 31a, and 31d areipogi tioned to register respectively with Atheiliner per forations ,die and i316. Accordingly, an adhesive bendmay be formed through these .openings between the vfacing ,surfacesof -thebacking material segments which `amicnrposedfto.each other through these Openings. In sirnilar-mannenfthe liningimaterial ,pelziorations tlc .andlf are .brought into registry with fthe-timing material neriorations 3,11: and ,cie so .that the back-ins materiallaminations Qf the Wines iadil' .marche .adhered directly tothe backing materialipartsef lthe end closure members .te and 5l. n

Edllowing the described operation of folding the ,bottoni ,end `panels r5.4 ,and .eeinto place, the end .23ans .50 .and .5J may ibefolded over A,and adhered 4to .the backing material side of fthe .end panel .49.. Herey again, ,the ,ner'forationsin thelininematerial lamination .of ,the .end ,naps 50 ,and ,5l insures .direct .bending ci the 4backing .material lamination cf ,messinese .therackigfmarm lamination of the panel 45. The bottom end closure structure is completed by bringing a pressing head into engagement with this structure to press the same against the forming mandrel and thus produce an efcient adhesive material bond between all facing parts of the structure. As explained in applicants prior patent, referred to above, by recessing the

end panels

52 and 53 along the opposite edges thereof to provide spaces for accommodating the

wing parts

54, 55, 56 and 5l, a bottom closure structure is obtained which has substantially uniform multi-ply thickness throughout the entire area thereof. Further, provision of these recesses to accommodate the identified wings of the blank insures that these wings will not interfere with uniformly ecient bonding of the facingly engaged parts of the blank bottom closure portion 4| together as pressure is applied to the overlapped parts of this blank portion to complete the bottom closure operation.

In closing the tcp of the package, the upper opposed end wall parts 58 and 69 are pushed toward each other to bend the mouth closure parts 50 and t!! toward the overlapped

mouth closure parts

59 and 55, and similarly to move the mouth closure panels El and 63 inwardly toward the mouth closure side panel 52. Concurrently, the

mouth closure parts

62 and 56 and the overlapped mouth closure parts ll, 12, 59, and 65 are moved toward each other. As this operation is completed, the panels E!! and El are respectively moved into facing engagement with the

panels

59 and 62, with the lining material perforations 37o in registry with the lining material perforations Sln and similarly with the lining material perforations 31p in registry with the lining material perforations 51s. Concurrently the mouth closure panels 53 and 5G are respectively moved into facing engagement with the panels B2 and 55. Here also, the lining material perforations 37k and 31h are respectively positioned to be brought into registry with the lining material perforations Slm and 31g. Further, those perforations 3l disposed in the center zone of the panel 62 are brought into registry with the perforations 31s disposed at the left end portion of the top closure panel 59. Thus, direct adhesive bonding of the backing material laminations of the overlapped mouth closing members 59 to 65, inclusive, may be obtained after these panels are brought into facing engagement in the manner described. The final forming operation is that of folding the flap E8 down over the mouth closure panel 62 to bring the perforated lining material side of this nap into facing engagement with the thermoplastic adhesive coated area 39h of the mouth closure panel B2. Heat and pressure may now be applied to the facingly engaged and overlapped mouth closure panels to effect melting of the thermoplastic adhesive materials coating the areas 39a and 39h and thus produce the desired sealing engagement between these panels of the blank. After the thermoplastic adhesive materials have cooled and reset, the pressure may be removed, leaving the engaged parts of the top closure structure bonded together. Thus, formation of the package is completed.

From the preceding detailed description of the packaging blank 35 and the manner of forming the same into a closed package, it will be understood that the lining material perforations 31 are in each and every instance so positioned as to permit direct adhesive bonding of overlapped backing material parts to each other.. AAt the `same time, in each oase'where a lining material surface is brought into overlapped facing engagement with another lining material surface or with a backing material surface, the two engaged surfaces are adhered together throughout the areas of engagement. The last-mentioned adhesive bonds, i. e., those adhering a lining material surface of the blank either to a lining material or to a backing material surface, serve completely to seal the package internallyagainst leakage through the lining material lamination. On the other hand, the adhesive bonds provided through the lining material perforations 3l effectively function as rivets between the outer backing material laminations which so strengthen the completed package structure as to prevent separation ofthe parts adhered together and more important to prevent failure of the adhesive material layerwhich bonds certain areas of the lining material to each other and also to overlapped areas ofthe backing material.

It will also be apparent from the preceding eX- planation that since the lining material H is not adhered to the backing vmaterial lil over narrow strip areas centrally embracingv the score lines 33, the folding or bending operations required in forming the blank into the package may be performed with minimum likelihood of perforating the lining material at one or more points along these lines inside the package. Thus, the lining material which overlies the score lines is entirely free to move independently of the adjacent segmental areas of the backing material and hence is not subject to the same tension and compressional strains as are imposed upon the backing material in carrying out the described folding operations. Further, all of the edges 30e which are exposed to the contents of the completed package are completely sealed against liquid penetration by the edge seal 30j. Moreover, the boundaries 38 within which the lining material perforations 3l are confined are so'marginally spaced from the boundaries of the 'adhesive material coating employed informing the blank into a package that each lining material perforation is effectively sealed oi by this adhesive material from the inside of the completed package. As a result of these features, the inwardly disposed lining material lamination of the completed package is completely sealed independently of the backing material lamination. In other words, the desired end is achieved of relying solely upon the lining material lamination to completely seal the package and relying upon the backing material lamination to supply the strength and rigidity to the package structure necessary to protect the sealed container afforded by the lining material lamination.

While one embodiment of the invention has been disclosed, it will be understood that various modifications may be made therein which are within the true spirit and scope of the appended claims.

I claim:

1. A laminated carton, comprising a paper lamination provided with score lines dividing the blank into panels, a non-porous liner lamination covering one side of said paper lamination and providedwith parts which are in, facing engagement, at least a pair of said parts of said liner lamination having openings therein which are in registry, whereby the overlapped panels of said paper lamination which are covered by said liner lamination parts are exposed to each 1l v other through said registering openings, an adherent securing' said liner lamination to one side of said paper lamination only over areas Inarginally spaced from said score lines and in areas of said paper lamination not exposed by said perforations. and an adhesive extending through said registering openings and adhering together those portions of said paper lamination which are exposed through said registering openings.

2. A laminated carton comprising a paper lamination and a non-porous liner lamination adhered to said paper lamination and having the same configuration as said paper lamination, said carton having a first panel, a second panel, a third panel, a fourth panel and a connector section, said panels and connector section being divided from each other by score lines, said connector section lying atwise against said rst panel with the liner lamination of said connector section disposed between the paper laminations of said first panel and said connector section and the liner laminations of said connector section having openings therethrough over the area thereof to permit the paper laminations of said rst panel and connector section to be adhered together through said openings, one edge portion of said carton having flaps .for alternate ones of said panels, said flaps being provided with Webs along the opposed edges thereof, the intervening panel being provided with an end section, said flaps being folded to lie flat against said end section with the liner laminations of said webs and end section in facing engagement and disposed between the paper laminations thereof, and the liner laminations of said webs and said end section being provided with openings therethrough which are in registry, said paper laminations of said webs being adhered to the paper lamination of said end section through said registering openings.

3. A laminated carton comprising a paper lamination and a non-porous liner lamination adhered to said paper lamination and having the Y 12 same conguration as said paper lamination, said .carton having a first panel, a second panel, a third panel, a fourth panel and a connector section, said panels and connector section being divided from each other by score lines, said connector section lying flatwise against said rst panel with the liner lamination of said connector section disposed between the paper laminations of said rst panel and said connector section and the liner laminations of said connector section having openings therethrough over the area thereof to permit the paper laminations of said rst panel and connector section to be adhered together through said openings, certain of said panels being provided with end portions which are adapted to be facingly engaged with the liner laminations thereof disposed between the paper laminations thereof, and the liner laminations of said panel end portions being provided with openings therethrough which are in registry, said paper laminations of said panel end portions being adhered together through said registering openings.

JULIUS A. ZINN, JR.

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