US2998178A

US2998178A - Lined container for liquids and liner therefor

Info

Publication number: US2998178A
Application number: US638016A
Authority: US
Inventors: Raymond E Jacke
Original assignee: Reynolds Metals Co
Current assignee: Reynolds Metals Co
Priority date: 1957-02-04
Filing date: 1957-02-04
Publication date: 1961-08-29
Anticipated expiration: 1978-08-29

Description

Aug. 29, 1961 R. E. JACKE 2,

LINED CONTAINER FOR LIQUIDS AND LINER THEREFOR Filed Feb. 4, 1957 3 Sheets-Sheet 1 I :7F f w I I /6\ .L 62 6} I l 5 /4\ I iii 6/ I I I I I I I I 44 7 2 I I i I I I I I I I I I I L I I 2 M58 60 LI '4' Z 35 20 J INVENTOR RA YMO ND E. JACKE ATTORNEY 1961 R. E. JACKE 2,998,178

LINED CONTAINER FOR LIQUIDS AND LINER THEREFOR Filed Feb. 4, 1957 3 Sheets-Sheet 2 INVENTOR RAYMOND E. JA CKE ATTORNEY Aug. 29, 1961 R. E. JACKE 2,998,178

LINED CONTAINER FOR LIQUIDS AND LINER THEREFOR Filed Feb. 4, 1957 3 Sheets-Sheet 3 INVENTOR 2! 5? 2 RAYMOND E. JACKE 55 5 1 5!. l5 BY ATTORNEY 2,998,178 Fatented Aug. 29, 1961 This invention relates to an improved lined container for liquids and to an improved liner therefor. More especially, it relates to an expendible container for liquids such as milk, fruit juice and the like, wherein such factors as sanitation, leak-proofness, reclosability after partial use, and inexpensive construction are desired. Various containers of this type, particularly for enclosing nonliquid contents, have been proposed heretofore, but so far as I am aware all such containers have possessed one or more of the disadvantages of poor sealing of the liner to provide an hermetic seal; difiiculty in uniformly sealing the liner to the enclosing container to prevent wrinkling or even rupture of the liner during filling and use; or inability to be formed and filled on modern, automatic, high-speed packaging machinery. It is a purpose of my invention to overcome these and other known disadvantages of conventional lined containers for liquids and other materials.

In my copending application, Serial No. 606,873, filed August 29, 195 6, Flexible Container Adapted For Fluids, of which this application is a continuation-in-part, one form of lined container is disclosed having a heat-sealable liner and adapted for use with standard packaging machinery. While that invention represents a significant advance over conventional lined and non-hermetically sealed packages which are intended to be closed by hand (a representative package of the known type being shown in Hogdal Patent No. 2,422,899), nevertheless the use of a single layer of heat sealing composition in the liner disclosed therein occasionally results in inadequate seals which it is the purpose of the present invention to overcome.

One object of the present invention is to provide an improved lined container for liquids and which may be reclosed following dispensing of a portion of the contents.

Another object is to provide an improved lined container having a substantially wrinkle-free metallic liner uniformly heat sealed to the walls of the container.

Another object is to provide an improved lined container having an hermetically-sealed metallic liner with a pleated expansion seam or joint therein.

Another object is to provide a reclosable lined container having a pouring spout at the top thereof.

Another object is to provide an improved metallic liner for containers having an improved metal-to-metal sealing portion.

A further object is to provide an improved laminated metallic liner which does not gall when in moving contact with metallic heat sealing apparatus.

A further object is to provide an improved laminated metallic liner which does not wrinkle when subjected to heat during a heat sealing operation.

Still a further object is to provide an improved lami nated metallic liner having discrete abraded portions through which a heat sealing composition may exude during heat sealing operations.

Still another object is to provide an improved laminated liner having spaced layers of heat sealing composition with a layer of material controlling the direction of migration of the composition.

Other objects and advantages will become apparent when the following description is considered in con- 2 junction with the accompanying drawings, showing a presently preferred form of lined container for liquids, with my improved heat-scalable liner therein.

In the drawings:

FIG. 1 is a perspective view of the filled and sealed container.

FIG. 2 is a view of the container following the breaking of an overwrap and before breaking of the sealed liner.

FIG. 3 is a developed View of the blank from which the container body is formed.

FIG. 4 is a perspective view of the top of the container following filling and before final sealing.

FIG. 5 is a perspective view of the top of the container during pouring of its contents.

FIG. 6 is a perspective View of the bottom of the container before sealing of the bottom portion.

FIG. 7 is a developed View of the improved liner, a portion of the lineembedded metallic foil being shown.

FIG. 8 is a sectional view on line 8-8 of FIG. 7 and to a greatly enlarged scale.

FIG. 9 is a view similar to FIG. 8 of a modified laminated liner.

FIG. 10 is a detail view of the top of the assembled liner as shown in FIG. 7 and showing the relative location of the expansion seam.

FIG. 11 is a detail View of the seam edges prior to interlocking.

FIG. 12 is a detail view of the seam edges during an intermediate stage of interlocking.

FIG. 13 is a detail view of the interlocked and sealed seam, and

FIG. 14 is an enlarged view on line 14-4 of FIG. 7 showing the band of perforations in the metallic liner layer.

FIGURE 15 is a diagrammatic enlarged cross-section of a portion of the top construction along the lines i15 of FIGURE 1.

FIGURE 16 is an enlargement of a portion of FIF- URE 14.

FIGURE 17 is an enlarged, fragmentary perspective view illustrating part of the liner of FIGURE 8.

Referring first to FIG. 1, a completed container package generally represented at 10 and having flat bottom, top and side wall portions, may be encased in a conventional overwrap 11 of any suitable material and with a conventional tear strip 12 adjacent its top. While in its completed filled form, the container not only is hermetically sealed by the improved liner, but also the top flaps thereof are interlocked by means of tab 13 on a second top fiap 15 engaging in a slot 14 on a first top flap 16 in the manner later to be described. It will be understood that the use of overwrap 11 is not essential when the invention is considered in its broader aspects.

When the overwrap and tear strip 12 is employed, the initial operation in opening the container results in neatly severing the overwrap near the top of the container and upon disengaging tab 13, the second cover flap 15 springs upwardly from the first cover flap 16, making accessible the hermetically sealed upper seam 17 of the container liner, as best seen in FIG. 2.

In view of the significance of the heat-sealable liner, an explanation of its construction is desirable prior to describing the container and reference thus is made to FIGS. 7 to 13, inclusive. The liner generally designated 20, preferably comprises a rectangular shaped laminated sheet having on one side a thin sheet 21 of metallic foil, preferably aluminum, and on the other side a somewhat thicker sheet 22 of a porous material, such as tissue paper. A centrally located sheet 23 of a material impervious to heated wax and comprising, for example, flexible paper or plastic film, is disposed between-sheets 21 and 22-. On

the sides of the central sheet 23, two spaced

layers

24 and 25 of a heat sealing composition such as microcrystalline wax, are provided, thus forming the liner into a five layered or laminated structure. Accordingly, when heat is applied to the liner by any suitable instrument such as a conventional electrically heated iron, the wax layers tend to flow, but, due to the presence of the wax impervious layer, the direction of How or migration is controlled and takes place in an outward direction.

Due to the dififerent coefficients of expansion of the several materials comprising the liner, and due to the tendency of the thin metallic sheet 21 to be abraded or galled by moving contact with a metallic sealing iron, I have found that wrinkling of the metallic sheet or wear thereof, or both, may occur in manufacture of the container unless provision is made to overcome the same. As a feature of this invention, I provide means to overcome these disadvantages and one satisfactory arrangemnt comprises the line-embedding of the metallic sheet into the layer of composition disposed beneath the sheet 21 in the manner illustrated in FIGURES 8, 9 and 17. A series of closely spaced parallel small grooves 26 are formed in one direction across the entire outer surface of the sheet 21, these grooves being intersected by a sim ilar series of grooves 27 at a suitable intersecting angle thereto. As the

respective grooves

26 and 27 are formed,

companion projections

28 and 29 are extruded on the lower side of sheet 21, these projections being embedded in the material comprising layer 24. The formation of the groove may be readily made, for example, by pressing the sheet 21 against a knurled die prior to incorporation of the sheet into the remainder of the liner. I prefer a line-embedding or scoring pattern of diamond shaped configuration, although other geometric patterns can be used. As a result of the minute surface air channels thus provided in the outer surface of metallic sheet 21, good slipping characteristics are found when a metallic sealing iron passes across the sheet. Moreover, expansion of the metallic sheet due to heating, can take place without warping or wrinkling the surface of the sheet as a whole. If desired, a three layer sheet of the type shown in my copending application can be used, employing (FIG. 9) a metallic sheet 21 having

grooves

26 and 27 as well as a tissue layer 22 and a wax layer 24 In this modification, the

projections

28 and 29 likewise are embedded in the wax layer. It is understood that the outer surface of the metallic sheet may be covered with a suitable protective coating if such is desired.

As will later appear, the wax which migrates through

tissue layer

22 or 22 is intended to adhere to the inner surfaces of the container, but for sealing of the confronting surfaces of the

metallic liner

21 or 21 to each other, means are required for permitting the passage of the wax through an otherwise impervious metallic layer. In my copending application, one form for accomplishing this function and comprising perforations in the metallic layer, is disclosed. In the present invention, I provide lightly punctured sealing bands of perforations in the

metallic layer

21 or 21 by passing thereover an abrading means such as a rouletting wheel, or roller covered with emery cloth, or the like, while under a sufficient pressure to form a series of spaced pin-holes of sufficient size to permit the heated wax to exude therethrough for sealing purposes. As seen in FIG. 7, a band 30 of this type is formed along the top edge of the liner, a band 31 is formed along the lower edge and a band 32 intersecting the other bands is formed along the right hand edge. The liner, moreover, is adapted to be folded on the respective fold lines 33 and 34 to provide a longitudinal side seam 35 of expansible properties, as will now be described. It will be noted, moreover, that fold line 34 is displaced slightly to the left of the edge of band 32, thus providing a narrow strip 36 of metallic sheet which is not abraded and through which wax cannot pass.

As seen in FIG. 14, an irregular abrading efiect is provided in which a number of perforations at random extend completely through the metallic layer 21, as for example the pin holes shown at 19.

Referring now to FIG. 11, in forming the seam 35, the projecting strip 37 outwardly of bend line 33, is folded under the upwardly turned band portion 32. When in this position, the abraded metallic layer 21 of band 32 is ready for contact with the unabraded metallic layer 21 adjacent strip 37; the unabraded strip 36 is ready for contact with the unabraded metallic layer adjacent strip 37; the porous layer 22 under band 32 is ready for contact with the metallic layer under strip 37; and the porous layer 22 above strip 37 is ready for contact with the porous layer ;22 adjacent band 32.

As seen in FIG. 12, the seam edges are partially folded with the strip 37 encompassing the band 32 and approaching contact with the remainder of the liner inwardly of fold line 34. In FIG. 13, the completed sealed seam 35 is shown, it being particularly noted that the narrow strip 36 which is not sealed to the abutting metallic surface 21 (to the left of the abraded band 32), thus remains available to permit a limited slippage with re spect to that metallic surface. By virtue of this feature, circumferential expansion of the liner which may take place during the sealing operation can be accommodated, thus avoiding wrinkling and especially avoiding any tendency of the liner to rupture or to break the seal. Moreover, since the formed container is flexible and, when filled with liquid, may be subjected to mechanical bulging stresses, the expansion seam or pleat is likewise eflective to accommodate stresses of this type.

With the foregoing description of the heat sealable liner in mind, reference is made to FIG. 3, showing one form of blank from which a comparatively rigid but flexible box-like container suited for use with the liner, may be assembled. The dimensions of the container may be suited for various quantities of liquid, as for example, quarts or pints and, in general, the relative dimension of the liner is as shown in the figure, the location of the above described seam 35 relative to the container walls likewise being shown. It is preferred to assemble the container and the tube-like liner separately and to heat seal the liner to the container walls after such separate assembly although other methods of assembly may be employed if desired.

The blank may comprise a conventional paperboard material having elongated wall panels 4!}, 41, 42 and 43 separated by suitable bend lines. Extending laterally from panel 43 is an elongated reinforcing flap 44, the inner edge of which is provided with a narrow glue strip 45 and the remainder of which is unglued to provide a clean surface 46. Panel 40 forms the front wall of the container and has hinged to its bottom a first bottom flap 50 and to its top, a first top flap 16. The top flap in turn has a triangular shaped central portion 52 bendable outwardly along

score lines

53 and 54 to form a convenient pouring spout.

Panel 41 forms a side wall of the container and has hinged to its bottom an inwardly and upwardly collapsible flap comprising a triangular portion 55, a trapezoidal portion 56 joining the triangular portion and the bottom portion 50 of the adjacent bottom flap 59 along

fold lines

57 and 58, respectively, and a small cantilever supported portion 59 attached to the trapezoidal portion along line 60. Similarly, panel 41 has hinged to its top an inwardly and downwardly collapsible flap comprising a triangular portion 61, a trapezoidal portion 62 and a small cantilever supported portion 63.

Panel 42 forms the rear wall of the container and has hinged to its bottom a second bottom flap 64 slightly tapered inwardly nearest its lowermost edges. Hinged to the top of panel 42 is a second top flap 15 completely detached from the adjacent top flaps and having at one side a sharply directed recess 65 from which projects a lateral locking tab 13. Opposite tab 13 is formed a pro 3 jection 81 to facilitate tearing open wrapper and lifting up panel 15.

Panel 43 forms a side wall of the container and has hinged to its bottom and inwardly and upwardly collapsible flap which forms a mirror image of the flap attached to the bottom of the other side wall. This flap comprises a triangular portion 66, a trapezoidal portion 67 and a cantilever supported portion 68. Hinged to the top of panel 43 is an inwardly and downwardly collapsible flap which forms a mirror image of the flap attached to the top of the other side wall. This flap in turn comprises a triangular portion 69, a trapezoidal portion 70 and cantilever supported portion 71.

In assembling the thus described blank, the several panels are bent along their longitudinal fold lines and the portion of panel 49 between its edge 72 and the dotted line 73 is glued to flap 44 along the glue line 45,, but the unglued portion 46 of that flap extends over to dotted line 74. It thus will be noted that the entire locking slot 14 overlies an unglued upper portion of the reinforcing flap 44 and that no interference with the latter insertion and removal of the locking tab into and out of that slot will occur.

With the blank thus shaped in tubular form, the above described heat sealable liner in tubular form with its expansion seam 35 generally along the center line of front wall 40 is placed therein and a heat sealing operation is conducted by passing an iron through the assembly or the assembly over an iron, or both. During this lining operation the heat causes the wax in layer 25 of the liner to pass through tissue layer 22 and to adhere to the interior surfaces of the empty open ended container. Due to the presence of the imperforate central layer 23 of the liner, only the wax in layer 25 acts to seal the liner to the container, the entire layer 24 of wax remaining available for the self-sealing of the confronting metallic layers, as will later be described. Thus, an exceptionally uniform sealing, both of the liner to the container and of the liner to itself may be insured. However, in some usages a satisfactory sealing of both surfaces may be secured with the more conventional liner construction as seen in FIG. 9.

At the conclusion of the lining operation all

walls

40, 41, 42 and 43 are attached to a smooth unwrinkled liner, as are the top and bottom flaps attached to

walls

40, 41

and 43. However, the top and bottom flaps 1'5 and 64 attached to rear walls 42 are deliberately kept separate from the liner. It will further be noted that unsupported liner material now covers the triangular open spaces above flap portions 59 and 68 in the bottom flaps and below the

flap portions

63 and 71 in the top flaps. In particular, it will be noted that the liner extends sufiiciently far outwardly along the top flaps so that in pouring the liquid from the open container, no spillage occurs in the region of the collapsible side top flaps.

Referring now to FIG. 6, the container with its liner heat-sealed in place is then folded at its bottom by collapsing the side flaps 55 and 66 inwardly and by pushing the bottom flap 50 upwardly upon the collapsed side flaps. In so doing the abraded band 31 of the liner is folded in such fashion that when two metallic surfaces at the lower edge of that liner meet each other both such surfaces are part of the band 31. When flap 50 is fully closed to form a flat bottom container a small seam of the liner then extends downwardly from the bottom of the container adjacent the freely hanging flap 64. A sealing iron is then passed over this seam, whereupon wax from layer 24 exudes through the pin holes in the abraded band 31 and securely seals the metallic surfaces of the liner to each other. By reason of the imperforate layer 23 in the liner sufficient wax is available to insure a tight seal even though the same portion of the liner may already have been subjected to heat during the previous sealing of the liner to the container walls.

Following completion of the bottom seal, the bottom flap 64 is then folded over the seam and over the bottom flap 50 and is affixed to that flap by any suitable adhesive. At this time the container is ready for sterilization, if desired, and then for filling with liquid which can be conducted on any high speed filling apparatus, it being noted that all folding and sealing operations described above are also suitable for being accomplished on conventional packaging machinery.

After sterilization and filling, the container is closed and hermetically sealed as indicated in FIG. 4. As the top side flaps 61 and 69 are collapsed inwardly and downwardly -by pressure applied to the front top flap 16, the confronting surfaces of the metallic liner, best seen in FIG. 10, are folded upon each other along the region of abraded band 30. Moreover, the liner layer 22 may, if desired, be heat sealed to the inner surface of reinforcing strip 46 thus being spaced from the wall 40 at the region where the locking tab 13 is to engage with the slot 14 in that wall. As in the case of the sealing seam at the bottom of the container, wax from layer 24 exudes through the pin holes in the abraded band 30 and when a sealing iron is passed over the seam 17 (FIG. 2) adjacent the freely upwardly extending flap '15, a hermetic seal is then provided for the contents of the container.

In completing the package, flap 15 is turned downwardly folding seam 17 upon the flap 16 and the locking tab 13 may be engaged in the locking slot 14. The overwrap may then be added to the package when desired. As above described, in opening the sealed package, the overwrap is torn and the flap 15 is raised to the position of FIG. 2. Seam 17 is then readily accessible for grasping at one end with the hand and is torn open by the user of the package. As seen in FIG. 5, with the seam 17 removed and the first top flap 16 pulled outwardly, the container is ready for dispensing of its liquid contents. The triangular portion 52 of top flap 16 bends along

fold lines

53 and 53 to provide a pouring spout.

If only a portion of the contents are to be dispensed at a given time, the container may be readily reclosed merely by pushing the first top flap 16 rearwardly and downwardly at which time the spout is reconverted into a flat shaped flap and the

side portions

61 and 69 of the adjacent top flaps again collapse inwardly and downwardly.

By moving the second top flap 15 downwardly and by engaging locking tab 13 in looking slot 14, the container is again closed although, as will be understood, it no longer is completely sealed hermetically. While my container and liner is especially useful in the packaging of liquids, it will be obvious that it may be employed in the packaging of other materials as well. The efiicient hermetic seal provided in my container is particularly valuable in the packaging of food stuffs, wherein long shelflife is likely.

It will be apparent to those skilled in the art that various modifications can be made in the embodiment of the invention above described, particularly in the choice of materials employed for the heat sealable liner and for the blank from which the container is fabricated. While I have shown particular embodiment of the invention, it will be understood, of course, that I do not wish to be limited thereto, and I, therefore, contemplate by the appended claims to cover any such modifications, as fall within the true spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent ofthe United States is:

1. A lined container adapted for liquids comprising, a comparatively rigid, box-like member having a bottom portion, wall portions and a top portion hinged to said wall portions, said top portion comprising a first top flap hinged to the front wall portion, a second top flap hinged to the rear wall portion and collapsible side top flaps hinged to the side wall portions; and a liner having an inner layer of metallic material, an outer layer of porous material and heat-sealing composition means intermediate said layers, said liner being assembled with its nonmetallic surface heat-sealed by means of its heat-sealing composition means to said bottom and Wall portions and with its inner metallic surface for contact with the contents of the container and heat-sealed to itself by means of said heatsealing composition means along bottom, side and top seams extending respectively across said bottom portion, longitudinally along a side wall portion interiorly of said container, and across said top portion, said top seam extending above said first top flap and beneath said second top flap, thereby to permit said container to be opened while maintaining its box-like form.

2. A container as defined in claim 1, wherein said longitudinal side seam includes a non-sealed overlapping strip of liner, thereby to permit expansion of the liner transversely of said container.

3. A container as defined in claim 1 wherein said metallic layer comprises aluminum foil.

4. A reclosable lined container adapted for liquids comprising, a comparatively rigid box-like member having a bottom portion, Wall portions and a top portion hinged to said wall portions, said top portion comprising a first top flap hinged to the front wall portion and having a locking slot therein, a second top fiap hinged to the rear wall portion and having a projecting locking tab adapted for engagement with said locking slot, and collapsible side top flaps hinged to the side Wall portions; and a liner having an inner layer of metallic material, an outer layer of porous material and heat-sealing composition means intermediate said layers, said liner being assembled with its non-metallic surface heat sealed by means of its heat-sealing composition means to said bottom and wall portions and to a part of said first top flap leaving a liner-free part of said first top flap out of contact With said liner and with its inner metallic surface for contact with the contents of the container and heat sealed to itself by means of said heat-sealing composition means along bottom, side and top seams extending respectively across said bottom portion, longitudinally along a side wall portion interiorly of said container, and across said top portion, said top seam extending above said first top flap and beneath said second top fiap and being folded therebetween when said locking tab is inserted in said locking slot.

5. A reclosable lined container adapted for liquids comprising, a comparatively rigid box-like member having a bottom portion, wall portions and a top portion hinged to said Wall portions, said top portion comprising a first top flap hinged to the front wall portion and having a locking Slot therein, a second top flap hinged to the rear wall portion and having a projecting locking tab adapted for engagement with said locking slot, and collapsible side top flaps hinged to the side wall portions; and a liner having an inner layer of metallic material, an outer layer of porous material and a layer of heat-sealing composition intermediate said other layers, said liner being assembled with its non-metallic surface heat sealed to said bottom and wall portions and to a part of said first top flap leaving a liner-free part of said first top flap out of contact with said liner and with its inner metallic surface for contact With the contents of the container and heat sealed to itself by means of its heat sealing composition along bottom, side and top seams extending respectively across said bottom portion, longitudinally along a side wall portion interiorly of said container, and across said top portion, said top means extending above said first top flap and beneath said second top flap and being folded therebetween when said locking tab is inserted in said locking slot, and wherein one of said side top flaps includes a reinforcing flap underlying the locking slot'in said first top flap and wherein said liner is in contact with the inner surface of said reinforcing flap and spaced from said liner-free part of said first top flap in the region of said locking slot.

6. A lined container adapted for liquids comprising, a

comparatively rigid box-like member having a bottom portion, wall portions and a top portion hinged to said wall portions and adapted for convenient pouring of the container con-tents, said top portion comprising a first top flap hinged to the front wall portion, a second top flap hinged to the rear wall portion and collapsible side top flaps hinged to the side wall portions; and a liner having an inner layer of metallic material, an outer layer of porous material and heat-sealing composition means intermediate said layers, said liner being assembled with its non-metallic surface heat-sealed by means of its heatsealing composition means to said bottom and Wall portions and to a part of said first top flap, and with its inner metallic surface for contact with the contents of the container and heat-sealed to itself by means of said heatsealing composition means along bottom, side and top seams extending respectively across said bottom portion, longitudinally along a side Wall portion interiorly of said container, and across said top portion, said top seam extending above said first top flap and beneath said second top flap and being adapted to be unsealed when the container is opened, said first top flap having a triangular portion bounded by fold lines in said flap along which said triangular portion may be moved outwardly to deform said first top flap into a pouring spout and with said triangular portion including a part of said first top flap to which said liner is heat-sealed, thereby to employ said liner as a portion of said pouring spout.

7. In combination, a container, a laminated heat-sealable liner having a layer of metallic foi-l on a first side adapted to contact the contents of said container, a layer of porous material on a second side and heat sealing composition means intermediate said first mentioned liner layers, said porous layer being heat-sealed to said container by means of said heat-sealing composition means, said foil layer being heat sealed to itself by means of said heat-sealing composition means along seam means of said liner, said foil layer having a first series. of spaced grooves intersecting with a second series of spaced grooves, each of said grooves being line-embedded in said heat sealing composition means thereby to provide one or more of the advantages of improved slipping characteristics between said foil and metallic heat sealing apparatus and minimizing of wrinkle formation in said foil due to heat expansion thereof.

8. In combination, a container, a laminated, rectangular heat-scalable liner in said container, said liner having a layer of metallic foil on a first side adapted to contact the contents of said container, a layer of porous material on a second side and heat sealing composition means intermediate said first mentioned liner layers, said porous layer being heat-sealed to said container by means of said heat-scaling composition means, said foil layer having a band of perforations extending about three edges of said foil layer and having sufiicient size to permit said composition means to exude therethrough upon application of heat, said liner being folded to provide a top seam, a

bottom seam and a side seam, each of said top seam, bottom seam and side seam having metal-to-metal contact of said foil with the contacting portions held in sealing relation by said composition means passing through said band of perforations.

9. A combination as defined in claim 8 wherein said side seam includes a non-sealed overlapping strip of metallic foil adjacent the perforations along one edge of said foil layer, said non-sealed strip slipping with respect to the confronting metallic surface to accommodate expansion of the sealed liner.

10. In combination, a container, a laminated heatsealable liner in said container, said liner having a layer of metallic foil on a first side adapted to lie adjacent the contents of said container, a layer of porous material on a second side, a layer of imperforate material intermediate said foil and porous layers, and a layer of migratory heat-sealing composition between said imperforate material and each of said metallic foil and porous material, said porous layer of said liner being heat sealed to said container by said layer of heat-sealing composition disposed between said porous layer and said imperforate material, said foil layer of said liner being heat sealed to itself by said layer of heat-sealing composition disposed between said foil layer and said imperforate material, said layer of int-perforate material preventing migration of said composition from a given layer thereof to the side of the liner beyond said imperforate material.

l1. A combination as defined in claim 10, wherein said metallic foil comprises aluminum, said porous material comprises tissue paper and said heat-sealing composition comprises microcrystalline wax.

12. A combination as defined in claim 10 including perforations in said metallic foil layer arranged in seamdefining areas through which said composition in the layer lying between the imperforate layer and the foil layer passes.

13. A combination as defined in claim 12 wherein said perforations lie in a band adjacent the edges of said foil layer.

14. An hermetically sealed container including a comparatively rigid box-like member having a heat-sealed liner therein, said liner comprising a porous layer on a first side, a metallic layer on a second side in contact with the container contents and including perforations in said metallic layer defining seam areas, and a layer of heat-sealing composition intermediate said other layers with portions thereof displaced through said porous layer and said perforations, a portion of said composition displaced through said porous layer forming a seal between said porous layer and the inner surfaces of said container and that portion of said composition displaced through said perforations forming a seal of said metallic layer to itself along a bottom, a side and a top seam, said bottom and side seams being sealed prior to introduction of the container contents and said top seam being sealed after the introduction of those contents.

15. A container as defined in claim 14 wherein said side seam is expansible.

16. In combination with a container, a laminated heatsealable liner, said liner having a layer of non-porous material on a first side adapted to contact the contents of said container and being provided with perforations passing therethrough, said liner having a layer of porous material on a second side, said liner having heat-sealing composition means intermediate said non-porous layer and said porous layer, said heat-sealing composition means migrating through said porous layer to heat seal said liner to the interior surface of said container, said heat-sealing composition means migrating through said perforations in said non-porous layer to heat-seal said non-porous layer of said liner to itself.

17. A combination as set forth in claim 16 wherein said heat-sealing composition means comprises a single layer disposed between said porous layer and said nonporous layer.

18. A combination as set forth in claim 16 wherein said heat-sealing composition means comprises a plurality of layers respectively separated by heat-sealing composition barrier means.

References Cited in the file of this patent UNITED STATES PATENTS 1,597,677 Everett Aug. 31, 1926 1,754,839 Smith Apr. 15, 1930 2,152,323 Moore Mar. 28, 1939 2,310,712 Schmied Feb. 9, 1943 2,363,425 Klein NOV. 21, 1944 2,422,899 Hogdal June 24, 1947 2,425,043 Moore Aug. 5, 1947 2,427,858 Hogdal Sept. 23, 1947 2,429,538 Wood Oct. 21, 1947 2,430,459 Farrell et a1 Nov. 11, 1947 2,432,052 Waters Dec. 2, 1947 2,441,778 Travel May 18, 1948 2,497,870 Dennis Feb. 21, 1950 2,555,380 Stuart et a1. June 5, 1951 2,629,534 Reynolds Feb. 24, "1953 2,723,936 Ryan Nov. 15, 1955 2,826,349 Hovland Mar. 11, 1958 2,830,001 Barnes et al. Apr. 8, 1958 FOREIGN PATENTS 1,022,575 France Dec. 17, 1952