CA2042999A1 - Closed multilayer packaging and packaging material - Google Patents
Closed multilayer packaging and packaging materialInfo
- Publication number
- CA2042999A1 CA2042999A1 CA 2042999 CA2042999A CA2042999A1 CA 2042999 A1 CA2042999 A1 CA 2042999A1 CA 2042999 CA2042999 CA 2042999 CA 2042999 A CA2042999 A CA 2042999A CA 2042999 A1 CA2042999 A1 CA 2042999A1
- Authority
- CA
- Canada
- Prior art keywords
- layer
- strip
- margin
- packaging
- outside
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/26—Articles or materials wholly enclosed in laminated sheets or wrapper blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
- B65D5/42—Details of containers or of foldable or erectable container blanks
- B65D5/4279—Joints, seams, leakproof joints or corners, special connections between panels
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Packages (AREA)
- Wrappers (AREA)
- Bag Frames (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention relates to packaging in generally rectangular form made from at least one multi-layer strip shaped into a tube having longitudinal margins that overlap and are sealed together. The inside layer of thermoplastic layer of one strip has a protective flap projecting from the longitudinal margin thereof situated inside the packaging, the flap being folded outwards and adhering to an adjacent marginal zone of the strip, while the "outside" other margin of the strip has its inside layer overlying at least a portion of the folded-over flap and heat-sealed to the outside face of the inside margin via the folded-over flap and the thermoplastic inside layer of the outside margin.
The present invention relates to packaging in generally rectangular form made from at least one multi-layer strip shaped into a tube having longitudinal margins that overlap and are sealed together. The inside layer of thermoplastic layer of one strip has a protective flap projecting from the longitudinal margin thereof situated inside the packaging, the flap being folded outwards and adhering to an adjacent marginal zone of the strip, while the "outside" other margin of the strip has its inside layer overlying at least a portion of the folded-over flap and heat-sealed to the outside face of the inside margin via the folded-over flap and the thermoplastic inside layer of the outside margin.
Description
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CLOSED MULTI-LAYER PACKAGING AND PACKAGING MATERIAL
FIELD OF THE INVENTION
The present invention relates to closed, and in particular -sterile, multi layer packaging that is generally rectangular in shape and made from at least one multi-layer strip shaped into a tube having overlapping longitudinal margins that are sealed to each other in fluid-tight manner, the multi-layer strip comprising from the inside towards the outside of the packaging: an inside layer of thermoadhesive thermoplastic material, optionally a gas and light barrier film together with a layer for bonding it to the following layer, a support layer made of a relatively rigid material such as card, and optionally a thin covering layer of thermoadhesive thermo-plastic material, the terminal portion of the inside layer of ~-the "inside" margin of the two longitudinal margins of said multi-la~er strip being folded outwards a~d rearwards and being ;~
heat-sealable to the inside layer of the "outside" other longi*udinal marginO ~ -BACKGROUND OF THE INVENTION
In this type of prior art packaging as described, for example, in European patent No. 0 124 772, one of the longitudinal margins of the multi-layer strip is partially cut down from its outside face through about one half of its ~
thickness, such that there remains a portion of the thickness :
of the card support layer together with the layers beneath the cut down portion of the card, which layers include the inside layer o thermoadhesive thermoplastic material. In -this case, one-half of the cut-down portion of the longitudinal margin is folded outwards and onto itself in such a manner that the inside layer co~es into alignment with the outside layer of said margin and can be heat sealed directly to the inside layer of the "outside" other margin of the tube-shaped multi-layer strip. In order to ensure good sealing at the junction between the two longitudinal margins of the multi-layer strip, the cutting down and the folding of the cut-down portion must be performed with high accuracy, and the outside margin must not only overlie the folded-over portion of the cut-down portion ..
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but it must also overlie the adjacent zone of the inside margin. Given the thicknesses of the layers in question and the speed at which packaging is fabricated, it is very difficult or impossible to satisfy this requirement for accuracy, and it often happens that because of faulty sealing between the outside margin of the cut-down folded-over portion of the inside margin, the cut-down card is e~posed to moisture by the liquid substance contained inside said packaging. The cut-down edge or margin of ths card support layer thus comes directly into contact with the liquid such that said layer of card swells by degrees and this swelling leads to localized destruction of the seal between the two superposed margins, thereby destroying the fluid-tightness of the packaging.
Proposals are made in European patent No. 0 006 259 to fabricate rectangular packaging by using a multi-layer strip whose margins are not cut down, and to cover the junction zone of the two longitudinal margins of the strip inside the '~
packaging with a sealing tape so as to prevent the liquid coming into contact with the bare edge of the card layer, with the thermoplastic sealing tape adhering in fluid-tight manner to the inside face of the packaging, and m~re precisely to the inside face of the inside longitudinal margin, and to the inside face of a zone of the strip immediately adjacent to the ~-outside margin and overlying the inside margin so as to leave a kind o longitudinal channel between the edge of the inside margin and the adjacent zone of -the outside margin of the tube-shaped packaging strip.
Manipulating this sealing strip inside the tube having ovexlapping lonyitudinal margins is complicated, as is applying the tape against the inside face of the packaging. In addition, the slightest sealing fault associated with this sealing tape renders the entire channel and thus the entirs layer of card accessible to moisture from the packaged material.
American patent No. 4 589 591 proposes folding onto itself the inside margin of the multi-layer strip that is shaped into a tube and heat-sealing the outside margin with its inside layer of thermoplastic material on a part of the inside layer . .
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of the folded-over portion of the inside margin and on an adjacent part of the card layer belonging to the non-folded over portion of said inside margin, with the junction zone between the two longitudinal margins being at a distance from ;
the fold zone of the inside margin. This technique initially prevents moisture from the liquid contained inside the packaging reaching the card layer. However, the fold in the inside margin gives rise to a thick rim which is difficult to heat-seal onto the outside margin and it leaves tubular gaps parallel to the longi-tudinal margins, so outside moisture can penetrate into these gaps and cause the card to swell until it breaks the heat seal between the two margins. In addition, folding the inside margin and sealing the outside margin onto a non-folded portion of ths inside margin means that a wider 15 strip must be provided and gives rise to wasted quantities of ~ ~
multi-layer strip for a given volume of packaging. ~ - i An object of the present invention is to eliminate these drawbacks, or at least to attenuate th~m.
SUMMARY OF THE INVENTION
This object is achieved by the fact that in the junction zone either between two heat-sealed longitudinal margins of the same multi-layer strip or between a longitudinal margin of a first multi-layer strip and a longitudinal margin of a second multi-layer strip, the terminal portion of the inside layer of thermoplastic material of the "inside" longitudinal margin situated on the inside of the packaging is formed by a protective flap which projects from said inside margin over a short but sufficient distance from the superposed and aligned edges of the other layers or films of the same margin, and is folded outwards so as to overlie the edges of said other layers or films in fluid-tight manner and also overlie an adjacent marginal zone of the outside face, of said strip and adhere thereto, and in that the "outside" other margin of the strip is heat-sealed to the outside facei of the inside margin, the *olded-over portion of the flap extending the thermoplastic inside layer o the inside margin and heat sealed to the outside face thereof being interposed between the thermoplastic ~`' ' : ' " " ' ' . ' .. . , ,. " '.' .' .', ''. . ': ' ' ' . ,-29~
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inside layer of the outside margin and said outside face of said inside margin, said flap adhering in fluid-tight manner to each of said margins.
By virtue of this design, the edge of the layer of card ~-is directly covered by the protective flap which simultaneously cont-ributes to improving the junction between the inside margin and the outside marginO All harmful gaps are eliminated from the zone where the flap is folded and from the width of the overlap zone, and the thickness thereof is kept down to the strict minimum required for providing long-lasting fluid-tight sealing.
The present invention also relates to a packaging material in the form of a multi-layer strip comprising an "inside" layer of thermoadhesive thermoplastic material for subsequently constituting the inside face of the packaging, and a support layer of card adhering to the insid~ layer either directly or else indirectly via a light and fluid barrier layer and an adhesive layer between said support layer and said barrier layer, and optionally also comprising an outside covering layer 20 of thermoadhesive thermoplastic material. ~
Packaging material in the form of a multi-layer strip of ;~-this type has longitudinal margins at which the various layers of the strip are apparent (see European patent No. 0 006 259), or are poorly protected (European patent 0 124 772, US patent 4 589 591). As a result, within a relatively short period of time, the portion of the card layer lying in the junction zone between the t~70 longitudinal margins is in danger of coming into contact with external moisture or with moisture from the liquid contained inside the packaging, and the resulting swelling of the card causes the fluid-tightness of the packaging to be broken.
An object of the present invention is to eliminate this drawback.
To this end, the inside layer of the multi-layer strip is extended laterally along at least one side so as to form a protective flap which pro~jects beyond the superposed lateral edges o all the other layers of said strip by a suffiaient - - . . . ::
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^ 5 distance to be capable of being folded over said superposed edges to overlie in fluid-tight manner both said edgas and a ` ~
marginal zone of the outside face of said strip, which zone ~ - -subsequently has the other margin of the same strip or one of ~ -the margins of a second multi-layer strip applied thereagainst.
Thus, the means required for sealing the edges of the inside margin of the packaging are already partially attached to the multi-layer s~rip, thereby significantly facilitating fabrication of the final packaging.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention are described by way of example with reference -to the accompanying drawings, in which:
Figure 1 is a perspective view of closed packaging made from at leas-t one multi-layer strip, with a portion of the 15 strip being shown having its layers separated from one another; ;- -Figure 2 is a diagrammatic elevation view in cross-section through a first embodiment of the packaging material;
Figure 3 is a diagrammatic elevation view in cross-section through packaging while it is being fabricated from a single multi-layer strip material as shown in Figure 2;
Figure 4 is a diagrammatic elevation view in cross-section through packaging made from a single multi-layer strip as shown in Figure 2, this view showing more particularly the junction zone between two longitudinal margins of said strip; ~
Figure 5 is a diagrammatic elevation view in cross-section ;~-through packaging made from two multi-layer strips of the type shown in Figure 1;
Figure 6 is a diagrammatic elevation view in cross-section through packaging made from two multi-layer strips one of which (to the right in the figure) is a conventional multi-layer strip while the other one is a multi-layer strip as shown in one or other of Figures 8 and 9;
Figures 7 to 9 are diagra~natic elevation views through various different embodiments of a single multi-layer strip:
and Figures 10 and 11 are diagrammatic elevation views through two embodiments of a set of two multi-layer strips adhering to each other via their inside layers.
~2~9 ` 6 DETAILED DESCRIPTION
The closed multi-layer packaging of the present description has a sterile inside face and is generally rectangular in overall shape, or is similar in shape~ This type of packaging is made from at least one multi~layer strip or from two multi-layer strips whose margins overlap and are bonded together in fluid-tight manner. Methods of fabricating packaging of this type which is filled while it is being fabricated are widely known, e.g. *rom French patents Nos. -1 192 6g7 and 1 198 792, from Swiss patent No. 621 744, and from European patents Nos. 0 083 131 and 0 302 413, to name but a few, so the present description is limited to the essential features of the present invention.
~s can be seen in Figure 1, the packaging material from which rectangular packages 1 are made and filled with a liquid and/or semi-liquid substance of varying degrees of viscosity while the packaging is being fabricated and prior to final sealing comprises at least one multi-layer strip 2 comprising from the inside towards the outside of the package 1: an inside layer 3 of thermoadhesive thermoplastic material such as polyethylene; an optional barrier film or layer 4 which is gas-tight and lightproof such as aluminum foil or the like, together with a thermoadhesive bonding layer 5 for establishing a secure bond with the following layer 6 which is a support layer made of a material such as card that is relatively stiff but capable of being folded; plus an optional thin covering layer 7 made of thermoadhesive thermoplastic material such as polyethlene.
Naturally, the composition of the multi-layer strip 2 is 30 not limited to that described above by way of example, -particularly since the invention does not relate to a multi-layer strip of a given composition but relates to a multi-layer strip which includes a thermoplastic inside layer 3 and a support layer 6, with the number and nature of other layers in the strip 2 being variable, depending on re~lirements ~see Figure 2).
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As can be seen in the drawings, and in particular in Figures 2 to 7, the inside layer 3 projects laterall~ from at -;
least one side so as to form a pro-tective flap 8 running along ~ ~ -the entire length of the multi-layer strip 2 and projecting beyond the lateral edges (or sides of the margins) 9 of all the other superposed layers 4, 5, 6, and 7 of said strip 2 by a distance d which is sufficient to enable it to be folded back over said superposed edges 9 so as to cover said edge 9 and a marginal zone lOa o~ the outside face 10 of said strip 2 in 10 sealed manner, which marginal zone lOa subsequently has the ;
other margin 2b of the same strip 2 (Figures 3 and 4) or one (e.g. 102a) of the longitudinal margins (102a, 102b) of a second multi-layer strip 102 (Figures 5, 6) applied thereagainst in ~luid-tight manner by heat-sealing.
Figure 3 shows a tube 11 formed from a single multi-layer strip 2 with the major portion of the periphery of the tube 11 being represented diagra~natically by dashed lines. In this ~ :
case, the inside face of the flap 8 extending the inside layer 3 along one of the sides of the strip 2 beyond the edges 9 of the other layers 4 to 7 is heat-sealed in the softened state under the action of determined pressure P against the inside ,;, , face of the inside layer 3 of the other margin 2b of the same multi-layer strip 2 so that the longitudinally-extending edge of the flap 8 comes into alignment with the edges of the other 25 margin 2b of the strip 2 (Figure 3). The following operation :~
in ~abrication of the packaging 1 consists in folding the assem~led flap 8 and margin 2b over the entire width d of the flap 8 around the bare edges 9 of the first margin 2a of the !~
strip 2 without leaving any ga~ between said flap 8 iand said edges 9, and in heat-sealing the flap 8 over at least a portion of its width d and preferably over its entire width d to the -adjacent marginal zone lOa on the outside face 10 of said strip 2 (see Figure 4, for example). This provides a permanent and fluid-tight bond between the two margins (e.g. 2a, 2b) of a 35 single strip 2 or of two strips 2 and 102 while simultaneously ~
protecting the support layer 6 against any edge-on ~ -infiltration of dampness.
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As mentioned above, in the finished packaging 1, the protective flap 8 overlies the outside face 10 of the inside margin 2a of the tube 11 and of the resulting packaging 1, covering a marginal zone lOa whose width corresponds (ignoring the thickness of the layers 4 to 7) to the width of the zone over which the inside margin 2a and the outside margin 2b are heat-sealed together. Naturallyr the flap 8 is itself heat sealed to the outside face 10 of the inside margin 2a of the tube 11 or of the packaging 1 over at least a portion of the overlaid marginal zone. The protective flap 8 preferably overlies the outside ~ace 10 of the inside margin 2a o the tube 11 over the entire marginal zone lOa having the outside margin 2b o~ the tube ll or of the packaging 1 overlying it, and it is heat-sealed over the entire marginal zone lOa both to the outside face 10 of the inside margin 2a and to the inside layer 3 of the outside margin 2b of the multi-layer strip 2.
In general, -the term "inside margin" designates that or those margins of a multi-layer strip whose outside face 10, lOa -is partially overlaid by the protective flap 8 and which is/are 20 to be found inside the packaging 1 or tube 11, while the term ~
"outside margin" designates that or those margins o a multi- ~ -layer strip not including the protective flap and to be found on the outside of the packaging 1 or of the tube 11.
As can be seen in Figures 8 and 9, the multi-layer strip 2 has an inside layer 3 which projects laterally along both sides so as to form two protective flaps 8 and 108, each of which projects beyond the superposed lateral edges 9 and 109 on the same side and corresponding to all of the other layers ~ to 7 of said strip, with the flap extending a distance d which is sufficient to enable it to be folded over said superposed edges 9 or 109 and to enable it to overlie in sealed manner both said edges 9 or 109 and a marginal zone lOa or llOa of the outside face 10 of said strip 2.
In this case, the pac~aging 1 or tube 11 is made using this irst multi-layer strip 2 and using a conventional second multi-layer strip 102, i.e. a strip 102 that does not include protective flaps, with one (102a) of the two "outside" margins .. .
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429g9 (102a, 102b) thereof being heat~sealed via its inside layer 103 to the flap 8 after the flap has been folded into place, and being bonded thereby to the outside face 10 of the first inside margin 2a of the first strip 2, while the other outside margin 102 is heat-sealed in the same manner to the flap 108 and via the folded-over portion thereto to the outside face 10 of the other inside margin 2a' of the first multi-layer layer strip 2 (Figure 6). -As can also be seen in Figure 9, the width 2L of the multi-layer strip 2 between its two margins (edges 9 and 109), i.e. its width not counting the protective flaps 8 and 108, is twice the width L of a strip as used for making packaging 1 from a single strip. The type of multi-layer strip as shown in Figure g may be split on a vertical plane 13 into two separate '~
15 strips each having one protective flap, as in -the example of ~ `
Figure 2. ~ -In order to avoid recourse to chemical sterilization of the inside layer 3 of the multi-laye~ strip, it is possible in conventional manner to sterilize said layer 3 including its flap(s) 8 and/or 108 during hot extrusion thereof and to cover the face that is subsequently on the inside of the packaging 1 ~ `~
with a peel-off protective sheet 14 whose face adjacent to said inside layer 13 is likewise sterile. Like the inside layer, the peel off sheet may be made of a thermoplastic material of `
25 the polyethylene type (Figures 7 and 8). -;
Figure 5 shows packaging 1 or a tube 11 made from two multilayers strips 2 and 102. The first inside margin 2a of the first strip 2 includes the flap 8 which is folded outward~
in the above-described manner and which is heat-sealed onto the 30 marginal portion lOa of the outside ace 10. The inside layer ~-3 at the outside margin 102b of the second multi-layer strip ;
102 (which margin 102b does not have a flap) is also heat- ~
sealed to said flap 8. In similar manner to the first strip 2, ;;
the inside margin 102a of the second strip 102 is provided with a flap 108 extending the inside layer 103, and after being folded round the edges 109 of the corresponding margin this flap is heat-sealed to the outside face 110 of the second strip 102, ' ~ , . .
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after previously being heat-sealed, e.g. by foldiny, to the inside layer 3 of the outside margin 2b of the first strip 2.
In other words, in the junction zones, each of the two strips 2, 102 includes an inside layer 3, 103 along a first margin designed to constitute an inside margin 2a, 102a of the packaging 1, which inside layer 3, 103 is extended laterally by means of a protective flap 8, 108 that is folded outwards so as to overlie the edges 9, 109 of the other layers 4, 5, 6, and 7 of said strip in sealed manner and also overlie a marginal zone adjacent to the outside face 10, 110 of said strip and adhere thereto. The second margin 2b, 102b of each strip 2, 102 overlies the adjacent first margin 102a, 2a of the other strip 102, 2 and it is heat-sealed to the inside layer 103, 3 thereof via the folded-over portion of the flap 8, 108 overlying said 15 first margin 2a, 102a of the other strip (2, 102). i The packaging may be made up from two multi-layer strips 2, 102 with a first margin on a first strip being heat-sealed onto one of the margins of the second strip and with the second margin being heat-sealed to the other margin of said second strip. In this case, the first strip 2 includes two lateral margins 2a, 2a' each of which is covered by one of the margins 102a, 102b of the second strip 102, and the inside layer 3 of the first strip 2 is extended laterally along both sides by respective protective flaps 8 and 108 each of which is folded outwards to o~erlia the edges of the other layers of said first strip 2 in sealed manner and also to ove-rlie an ad~acent marginal zone of the outside ace 10 of said first strip 2 and to adhere thereto. Each of the margins 102a and 102b of the second strip 102 overlying a corresponding margin of the first strip 2 is heat-sealed via its inside layer 103 onto the folded-over portion of the corresponding edge 8, 108 of the adjacent ma-rgin 2a, 2a' of said first strip 2.
In packaging material of the invention, the peel-off protective sheet may be constituted by the inside layer 103 of ~ second multi-layer strip 102. In one case, an intermediate film of silicone wax or similar material 15 is interposed bet~een the inside layer 3 of the first multi-layer strip 2 and .. .. . . . .
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~2~99 the inside layer 103 of -the second multi~layer strip 102, with -the intermediate film 15 being constituted in such a manner that it remains attached to one or other of the inside layers 3, 103 during peeling and moves off the surface thereof under the effect of pressure during the heat-sealing operation ( FigurP. 10 ) . , , In another embodiment of the packaging material, the peel~
off protective sheet may be constituted by the inside layer 103 of a second multi-layer strip 102 which adheres directly in ~ -10 peel-off manner to the inside layer 3 of the irst multi-layer ~ ~`
strip 2, with each of the inside layers 3 and 103 being constituted by a polyolefin, and in particular by heat-sealable grafted polyethylene. It should be observed that when the two multi-layer strips 2 and 102 are stuck together in peel-apart ~;
manner, it is advantageous for them to be superposed in offset manner so that the protective flap 8 or 108 of each strip is supported by the stiff portion of the other multi-layer strip.
This packaging material is made continuously by extrusion and by gluing thermoplastic layers on non-thermoplastic layers `, (card or aluminum foil), it being understood that the two inside layers are extruded separately and brought together after extrusion but while they are still sufficiently hot.
They may also be extruded separately at slightly different temperatures (e.g. with a temperature difference of 20C to 25 30C) and brought together immediately after being extruded ~
separately. ;
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CLOSED MULTI-LAYER PACKAGING AND PACKAGING MATERIAL
FIELD OF THE INVENTION
The present invention relates to closed, and in particular -sterile, multi layer packaging that is generally rectangular in shape and made from at least one multi-layer strip shaped into a tube having overlapping longitudinal margins that are sealed to each other in fluid-tight manner, the multi-layer strip comprising from the inside towards the outside of the packaging: an inside layer of thermoadhesive thermoplastic material, optionally a gas and light barrier film together with a layer for bonding it to the following layer, a support layer made of a relatively rigid material such as card, and optionally a thin covering layer of thermoadhesive thermo-plastic material, the terminal portion of the inside layer of ~-the "inside" margin of the two longitudinal margins of said multi-la~er strip being folded outwards a~d rearwards and being ;~
heat-sealable to the inside layer of the "outside" other longi*udinal marginO ~ -BACKGROUND OF THE INVENTION
In this type of prior art packaging as described, for example, in European patent No. 0 124 772, one of the longitudinal margins of the multi-layer strip is partially cut down from its outside face through about one half of its ~
thickness, such that there remains a portion of the thickness :
of the card support layer together with the layers beneath the cut down portion of the card, which layers include the inside layer o thermoadhesive thermoplastic material. In -this case, one-half of the cut-down portion of the longitudinal margin is folded outwards and onto itself in such a manner that the inside layer co~es into alignment with the outside layer of said margin and can be heat sealed directly to the inside layer of the "outside" other margin of the tube-shaped multi-layer strip. In order to ensure good sealing at the junction between the two longitudinal margins of the multi-layer strip, the cutting down and the folding of the cut-down portion must be performed with high accuracy, and the outside margin must not only overlie the folded-over portion of the cut-down portion ..
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but it must also overlie the adjacent zone of the inside margin. Given the thicknesses of the layers in question and the speed at which packaging is fabricated, it is very difficult or impossible to satisfy this requirement for accuracy, and it often happens that because of faulty sealing between the outside margin of the cut-down folded-over portion of the inside margin, the cut-down card is e~posed to moisture by the liquid substance contained inside said packaging. The cut-down edge or margin of ths card support layer thus comes directly into contact with the liquid such that said layer of card swells by degrees and this swelling leads to localized destruction of the seal between the two superposed margins, thereby destroying the fluid-tightness of the packaging.
Proposals are made in European patent No. 0 006 259 to fabricate rectangular packaging by using a multi-layer strip whose margins are not cut down, and to cover the junction zone of the two longitudinal margins of the strip inside the '~
packaging with a sealing tape so as to prevent the liquid coming into contact with the bare edge of the card layer, with the thermoplastic sealing tape adhering in fluid-tight manner to the inside face of the packaging, and m~re precisely to the inside face of the inside longitudinal margin, and to the inside face of a zone of the strip immediately adjacent to the ~-outside margin and overlying the inside margin so as to leave a kind o longitudinal channel between the edge of the inside margin and the adjacent zone of -the outside margin of the tube-shaped packaging strip.
Manipulating this sealing strip inside the tube having ovexlapping lonyitudinal margins is complicated, as is applying the tape against the inside face of the packaging. In addition, the slightest sealing fault associated with this sealing tape renders the entire channel and thus the entirs layer of card accessible to moisture from the packaged material.
American patent No. 4 589 591 proposes folding onto itself the inside margin of the multi-layer strip that is shaped into a tube and heat-sealing the outside margin with its inside layer of thermoplastic material on a part of the inside layer . .
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of the folded-over portion of the inside margin and on an adjacent part of the card layer belonging to the non-folded over portion of said inside margin, with the junction zone between the two longitudinal margins being at a distance from ;
the fold zone of the inside margin. This technique initially prevents moisture from the liquid contained inside the packaging reaching the card layer. However, the fold in the inside margin gives rise to a thick rim which is difficult to heat-seal onto the outside margin and it leaves tubular gaps parallel to the longi-tudinal margins, so outside moisture can penetrate into these gaps and cause the card to swell until it breaks the heat seal between the two margins. In addition, folding the inside margin and sealing the outside margin onto a non-folded portion of ths inside margin means that a wider 15 strip must be provided and gives rise to wasted quantities of ~ ~
multi-layer strip for a given volume of packaging. ~ - i An object of the present invention is to eliminate these drawbacks, or at least to attenuate th~m.
SUMMARY OF THE INVENTION
This object is achieved by the fact that in the junction zone either between two heat-sealed longitudinal margins of the same multi-layer strip or between a longitudinal margin of a first multi-layer strip and a longitudinal margin of a second multi-layer strip, the terminal portion of the inside layer of thermoplastic material of the "inside" longitudinal margin situated on the inside of the packaging is formed by a protective flap which projects from said inside margin over a short but sufficient distance from the superposed and aligned edges of the other layers or films of the same margin, and is folded outwards so as to overlie the edges of said other layers or films in fluid-tight manner and also overlie an adjacent marginal zone of the outside face, of said strip and adhere thereto, and in that the "outside" other margin of the strip is heat-sealed to the outside facei of the inside margin, the *olded-over portion of the flap extending the thermoplastic inside layer o the inside margin and heat sealed to the outside face thereof being interposed between the thermoplastic ~`' ' : ' " " ' ' . ' .. . , ,. " '.' .' .', ''. . ': ' ' ' . ,-29~
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inside layer of the outside margin and said outside face of said inside margin, said flap adhering in fluid-tight manner to each of said margins.
By virtue of this design, the edge of the layer of card ~-is directly covered by the protective flap which simultaneously cont-ributes to improving the junction between the inside margin and the outside marginO All harmful gaps are eliminated from the zone where the flap is folded and from the width of the overlap zone, and the thickness thereof is kept down to the strict minimum required for providing long-lasting fluid-tight sealing.
The present invention also relates to a packaging material in the form of a multi-layer strip comprising an "inside" layer of thermoadhesive thermoplastic material for subsequently constituting the inside face of the packaging, and a support layer of card adhering to the insid~ layer either directly or else indirectly via a light and fluid barrier layer and an adhesive layer between said support layer and said barrier layer, and optionally also comprising an outside covering layer 20 of thermoadhesive thermoplastic material. ~
Packaging material in the form of a multi-layer strip of ;~-this type has longitudinal margins at which the various layers of the strip are apparent (see European patent No. 0 006 259), or are poorly protected (European patent 0 124 772, US patent 4 589 591). As a result, within a relatively short period of time, the portion of the card layer lying in the junction zone between the t~70 longitudinal margins is in danger of coming into contact with external moisture or with moisture from the liquid contained inside the packaging, and the resulting swelling of the card causes the fluid-tightness of the packaging to be broken.
An object of the present invention is to eliminate this drawback.
To this end, the inside layer of the multi-layer strip is extended laterally along at least one side so as to form a protective flap which pro~jects beyond the superposed lateral edges o all the other layers of said strip by a suffiaient - - . . . ::
., i. . , ... , . ~ , , : , - , ~
";
.,: . ~
,, 2 ~ g ~
^ 5 distance to be capable of being folded over said superposed edges to overlie in fluid-tight manner both said edgas and a ` ~
marginal zone of the outside face of said strip, which zone ~ - -subsequently has the other margin of the same strip or one of ~ -the margins of a second multi-layer strip applied thereagainst.
Thus, the means required for sealing the edges of the inside margin of the packaging are already partially attached to the multi-layer s~rip, thereby significantly facilitating fabrication of the final packaging.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention are described by way of example with reference -to the accompanying drawings, in which:
Figure 1 is a perspective view of closed packaging made from at leas-t one multi-layer strip, with a portion of the 15 strip being shown having its layers separated from one another; ;- -Figure 2 is a diagrammatic elevation view in cross-section through a first embodiment of the packaging material;
Figure 3 is a diagrammatic elevation view in cross-section through packaging while it is being fabricated from a single multi-layer strip material as shown in Figure 2;
Figure 4 is a diagrammatic elevation view in cross-section through packaging made from a single multi-layer strip as shown in Figure 2, this view showing more particularly the junction zone between two longitudinal margins of said strip; ~
Figure 5 is a diagrammatic elevation view in cross-section ;~-through packaging made from two multi-layer strips of the type shown in Figure 1;
Figure 6 is a diagrammatic elevation view in cross-section through packaging made from two multi-layer strips one of which (to the right in the figure) is a conventional multi-layer strip while the other one is a multi-layer strip as shown in one or other of Figures 8 and 9;
Figures 7 to 9 are diagra~natic elevation views through various different embodiments of a single multi-layer strip:
and Figures 10 and 11 are diagrammatic elevation views through two embodiments of a set of two multi-layer strips adhering to each other via their inside layers.
~2~9 ` 6 DETAILED DESCRIPTION
The closed multi-layer packaging of the present description has a sterile inside face and is generally rectangular in overall shape, or is similar in shape~ This type of packaging is made from at least one multi~layer strip or from two multi-layer strips whose margins overlap and are bonded together in fluid-tight manner. Methods of fabricating packaging of this type which is filled while it is being fabricated are widely known, e.g. *rom French patents Nos. -1 192 6g7 and 1 198 792, from Swiss patent No. 621 744, and from European patents Nos. 0 083 131 and 0 302 413, to name but a few, so the present description is limited to the essential features of the present invention.
~s can be seen in Figure 1, the packaging material from which rectangular packages 1 are made and filled with a liquid and/or semi-liquid substance of varying degrees of viscosity while the packaging is being fabricated and prior to final sealing comprises at least one multi-layer strip 2 comprising from the inside towards the outside of the package 1: an inside layer 3 of thermoadhesive thermoplastic material such as polyethylene; an optional barrier film or layer 4 which is gas-tight and lightproof such as aluminum foil or the like, together with a thermoadhesive bonding layer 5 for establishing a secure bond with the following layer 6 which is a support layer made of a material such as card that is relatively stiff but capable of being folded; plus an optional thin covering layer 7 made of thermoadhesive thermoplastic material such as polyethlene.
Naturally, the composition of the multi-layer strip 2 is 30 not limited to that described above by way of example, -particularly since the invention does not relate to a multi-layer strip of a given composition but relates to a multi-layer strip which includes a thermoplastic inside layer 3 and a support layer 6, with the number and nature of other layers in the strip 2 being variable, depending on re~lirements ~see Figure 2).
., ' ' ' ' ' . , ' , ' ' '' '', ' ' ~ , ' / ~ ' .: , , :
':' "", , :
. ' ' . ' ~
2~429~ ~
.
As can be seen in the drawings, and in particular in Figures 2 to 7, the inside layer 3 projects laterall~ from at -;
least one side so as to form a pro-tective flap 8 running along ~ ~ -the entire length of the multi-layer strip 2 and projecting beyond the lateral edges (or sides of the margins) 9 of all the other superposed layers 4, 5, 6, and 7 of said strip 2 by a distance d which is sufficient to enable it to be folded back over said superposed edges 9 so as to cover said edge 9 and a marginal zone lOa o~ the outside face 10 of said strip 2 in 10 sealed manner, which marginal zone lOa subsequently has the ;
other margin 2b of the same strip 2 (Figures 3 and 4) or one (e.g. 102a) of the longitudinal margins (102a, 102b) of a second multi-layer strip 102 (Figures 5, 6) applied thereagainst in ~luid-tight manner by heat-sealing.
Figure 3 shows a tube 11 formed from a single multi-layer strip 2 with the major portion of the periphery of the tube 11 being represented diagra~natically by dashed lines. In this ~ :
case, the inside face of the flap 8 extending the inside layer 3 along one of the sides of the strip 2 beyond the edges 9 of the other layers 4 to 7 is heat-sealed in the softened state under the action of determined pressure P against the inside ,;, , face of the inside layer 3 of the other margin 2b of the same multi-layer strip 2 so that the longitudinally-extending edge of the flap 8 comes into alignment with the edges of the other 25 margin 2b of the strip 2 (Figure 3). The following operation :~
in ~abrication of the packaging 1 consists in folding the assem~led flap 8 and margin 2b over the entire width d of the flap 8 around the bare edges 9 of the first margin 2a of the !~
strip 2 without leaving any ga~ between said flap 8 iand said edges 9, and in heat-sealing the flap 8 over at least a portion of its width d and preferably over its entire width d to the -adjacent marginal zone lOa on the outside face 10 of said strip 2 (see Figure 4, for example). This provides a permanent and fluid-tight bond between the two margins (e.g. 2a, 2b) of a 35 single strip 2 or of two strips 2 and 102 while simultaneously ~
protecting the support layer 6 against any edge-on ~ -infiltration of dampness.
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, .
.: .
2~29~
As mentioned above, in the finished packaging 1, the protective flap 8 overlies the outside face 10 of the inside margin 2a of the tube 11 and of the resulting packaging 1, covering a marginal zone lOa whose width corresponds (ignoring the thickness of the layers 4 to 7) to the width of the zone over which the inside margin 2a and the outside margin 2b are heat-sealed together. Naturallyr the flap 8 is itself heat sealed to the outside face 10 of the inside margin 2a of the tube 11 or of the packaging 1 over at least a portion of the overlaid marginal zone. The protective flap 8 preferably overlies the outside ~ace 10 of the inside margin 2a o the tube 11 over the entire marginal zone lOa having the outside margin 2b o~ the tube ll or of the packaging 1 overlying it, and it is heat-sealed over the entire marginal zone lOa both to the outside face 10 of the inside margin 2a and to the inside layer 3 of the outside margin 2b of the multi-layer strip 2.
In general, -the term "inside margin" designates that or those margins of a multi-layer strip whose outside face 10, lOa -is partially overlaid by the protective flap 8 and which is/are 20 to be found inside the packaging 1 or tube 11, while the term ~
"outside margin" designates that or those margins o a multi- ~ -layer strip not including the protective flap and to be found on the outside of the packaging 1 or of the tube 11.
As can be seen in Figures 8 and 9, the multi-layer strip 2 has an inside layer 3 which projects laterally along both sides so as to form two protective flaps 8 and 108, each of which projects beyond the superposed lateral edges 9 and 109 on the same side and corresponding to all of the other layers ~ to 7 of said strip, with the flap extending a distance d which is sufficient to enable it to be folded over said superposed edges 9 or 109 and to enable it to overlie in sealed manner both said edges 9 or 109 and a marginal zone lOa or llOa of the outside face 10 of said strip 2.
In this case, the pac~aging 1 or tube 11 is made using this irst multi-layer strip 2 and using a conventional second multi-layer strip 102, i.e. a strip 102 that does not include protective flaps, with one (102a) of the two "outside" margins .. .
, -:
, .
.. . .
429g9 (102a, 102b) thereof being heat~sealed via its inside layer 103 to the flap 8 after the flap has been folded into place, and being bonded thereby to the outside face 10 of the first inside margin 2a of the first strip 2, while the other outside margin 102 is heat-sealed in the same manner to the flap 108 and via the folded-over portion thereto to the outside face 10 of the other inside margin 2a' of the first multi-layer layer strip 2 (Figure 6). -As can also be seen in Figure 9, the width 2L of the multi-layer strip 2 between its two margins (edges 9 and 109), i.e. its width not counting the protective flaps 8 and 108, is twice the width L of a strip as used for making packaging 1 from a single strip. The type of multi-layer strip as shown in Figure g may be split on a vertical plane 13 into two separate '~
15 strips each having one protective flap, as in -the example of ~ `
Figure 2. ~ -In order to avoid recourse to chemical sterilization of the inside layer 3 of the multi-laye~ strip, it is possible in conventional manner to sterilize said layer 3 including its flap(s) 8 and/or 108 during hot extrusion thereof and to cover the face that is subsequently on the inside of the packaging 1 ~ `~
with a peel-off protective sheet 14 whose face adjacent to said inside layer 13 is likewise sterile. Like the inside layer, the peel off sheet may be made of a thermoplastic material of `
25 the polyethylene type (Figures 7 and 8). -;
Figure 5 shows packaging 1 or a tube 11 made from two multilayers strips 2 and 102. The first inside margin 2a of the first strip 2 includes the flap 8 which is folded outward~
in the above-described manner and which is heat-sealed onto the 30 marginal portion lOa of the outside ace 10. The inside layer ~-3 at the outside margin 102b of the second multi-layer strip ;
102 (which margin 102b does not have a flap) is also heat- ~
sealed to said flap 8. In similar manner to the first strip 2, ;;
the inside margin 102a of the second strip 102 is provided with a flap 108 extending the inside layer 103, and after being folded round the edges 109 of the corresponding margin this flap is heat-sealed to the outside face 110 of the second strip 102, ' ~ , . .
. .
.
9 ~ :
10 ' . ' .
after previously being heat-sealed, e.g. by foldiny, to the inside layer 3 of the outside margin 2b of the first strip 2.
In other words, in the junction zones, each of the two strips 2, 102 includes an inside layer 3, 103 along a first margin designed to constitute an inside margin 2a, 102a of the packaging 1, which inside layer 3, 103 is extended laterally by means of a protective flap 8, 108 that is folded outwards so as to overlie the edges 9, 109 of the other layers 4, 5, 6, and 7 of said strip in sealed manner and also overlie a marginal zone adjacent to the outside face 10, 110 of said strip and adhere thereto. The second margin 2b, 102b of each strip 2, 102 overlies the adjacent first margin 102a, 2a of the other strip 102, 2 and it is heat-sealed to the inside layer 103, 3 thereof via the folded-over portion of the flap 8, 108 overlying said 15 first margin 2a, 102a of the other strip (2, 102). i The packaging may be made up from two multi-layer strips 2, 102 with a first margin on a first strip being heat-sealed onto one of the margins of the second strip and with the second margin being heat-sealed to the other margin of said second strip. In this case, the first strip 2 includes two lateral margins 2a, 2a' each of which is covered by one of the margins 102a, 102b of the second strip 102, and the inside layer 3 of the first strip 2 is extended laterally along both sides by respective protective flaps 8 and 108 each of which is folded outwards to o~erlia the edges of the other layers of said first strip 2 in sealed manner and also to ove-rlie an ad~acent marginal zone of the outside ace 10 of said first strip 2 and to adhere thereto. Each of the margins 102a and 102b of the second strip 102 overlying a corresponding margin of the first strip 2 is heat-sealed via its inside layer 103 onto the folded-over portion of the corresponding edge 8, 108 of the adjacent ma-rgin 2a, 2a' of said first strip 2.
In packaging material of the invention, the peel-off protective sheet may be constituted by the inside layer 103 of ~ second multi-layer strip 102. In one case, an intermediate film of silicone wax or similar material 15 is interposed bet~een the inside layer 3 of the first multi-layer strip 2 and .. .. . . . .
::
~2~99 the inside layer 103 of -the second multi~layer strip 102, with -the intermediate film 15 being constituted in such a manner that it remains attached to one or other of the inside layers 3, 103 during peeling and moves off the surface thereof under the effect of pressure during the heat-sealing operation ( FigurP. 10 ) . , , In another embodiment of the packaging material, the peel~
off protective sheet may be constituted by the inside layer 103 of a second multi-layer strip 102 which adheres directly in ~ -10 peel-off manner to the inside layer 3 of the irst multi-layer ~ ~`
strip 2, with each of the inside layers 3 and 103 being constituted by a polyolefin, and in particular by heat-sealable grafted polyethylene. It should be observed that when the two multi-layer strips 2 and 102 are stuck together in peel-apart ~;
manner, it is advantageous for them to be superposed in offset manner so that the protective flap 8 or 108 of each strip is supported by the stiff portion of the other multi-layer strip.
This packaging material is made continuously by extrusion and by gluing thermoplastic layers on non-thermoplastic layers `, (card or aluminum foil), it being understood that the two inside layers are extruded separately and brought together after extrusion but while they are still sufficiently hot.
They may also be extruded separately at slightly different temperatures (e.g. with a temperature difference of 20C to 25 30C) and brought together immediately after being extruded ~
separately. ;
' `" "
: :.
;~ ~ '.`
~
, , , , ,, :: -
Claims (11)
1/ Closed, and in particular sterile, multi-layer packaging that is generally rectangular in shape and made from at least one multi-layer strip shaped into a tube having overlapping longitudinal margins that are sealed on each other in fluid-tight manner, the multi-layer strip, comprising from the inside towards the outside of the packaging: an inside layer of thermoadhesive thermoplastic material, optionally a gas and light barrier film together with a layer for bonding to the following layer, a support layer made of a relatively rigid material such as card, and optionally a thin covering layer of thermoadhesive thermoplastic material, the terminal portion of the inside layer of the "inside" margin of the two longitudinal margins of said multi-layer strip being folded outwards and rearwards and being heat-sealable to the inside layer of the "outside" other longitudinal margin, wherein, in the junction zone either between two heat-sealed longitudinal margins of the same multi-layer strip or between a longitudinal margin of a first multi-layer strip and a longitudinal margin of a second multi-layer strip, the terminal portion of the inside layer of thermoplastic material of the "inside" longitudinal margin situated on the inside of the packaging is formed by a protective flap which projects from said inside margin over a short but sufficient distance from the superposed and aligned edges of the other layers or films of the same margin, and is folded outwards so as to overlie the edges of said other layers or films in fluid-tight manner and also overlie an adjacent marginal zone of the outside face of said strip and adhere thereto, and wherein the "outside" other margin of the strip is heat-sealed to the outside face of the inside margin, the folded-over portion of the flap extending the thermoplastic inside layer of the inside margin and heat-sealed to the outside face thereof being interposed between the thermoplastic inside layer of the outside margin and said outside face of said inside margin, said flap adhering in fluid-tight manner to each of said margins.
2/ Packaging according to claim 1, wherein the protective flap overlies the outside face of the inside margin over a marginal zone whose width corresponds to the width of the zone in which the inside and outside margins are heat-sealed together and is heat-sealed to said outside face of the inside margin over at least a portion of the overlying marginal zone.
3/ Packaging according to claim 1, wherein the protective flap overlies the outside face of the inside margin over the entire marginal zone overlaid by the outside margin, and in that it is heat-sealed over all of said marginal zone both to the outside face of the inside margin and to the inside layer of the outside margin.
4/ Packaging according to claim 1, and made up from two multi-layer strips with a first margin of a first strip being heat-sealed on one of the margins of the second strip and with the second margin being heat-sealed on the other margin of said second strip, wherein, in the junction zones, each of the two strips comprises, adjacent to a first margin intended to constitute an inside margin of the packaging an inside layer that is extended laterally by a protective flap which is folded outwards so as to overlie the edges of the other layers of said strip in fluid-tight manner and also a marginal zone adjacent to the outside face of said strip and adheres thereto, and wherein the second margin of each strip overlies the first adjacent margin of the other strip and is heat-sealed via its inside layer to the folded-over portion of the flap covering said first margin of the other strip.
5/ Packaging according to claim 1, made up from two multi-layer strips with a first margin of a first strip being heat-sealed onto one of the margins of the second strip and with the second margin being heat-sealed on the other margin of the said second strip, wherein the first strip includes two lateral margins each of which has one of the margins of the second strip overlying it, wherein the inside layer of the first strip extends laterally from each side in the form of a protective strip which is folded outwards so as to overlie the edges of the other layers of said first strip in fluid-tight manner and also an adjacent marginal zone of the outside face of said first strip and adhere thereto, and wherein each of the margins of the second strip overlying a corresponding margin of the first strip is heat-sealed via its inside layer onto the folded-over portion of the corresponding flap at the adjacent margin of said first strip.
6/ Packaging material in the form of a multi-layer strip comprising an "inside" layer of thermoadhesive thermoplastic material for subsequently constituting the inside face of the packaging, and a support layer of card adhering to the inside layer either directly or else indirectly via a light and fluid barrier layer and an adhesive layer between said support layer and said barrier layer, and optionally also comprising an outside covering layer of thermoadhesive thermoplastic material, wherein the inside layer of the multi-layer strip is extended laterally along at least one side so as to form a protective flap which projects beyond the superposed lateral edges of all the other layers of said strip by a sufficient distance to be capable of being folded over said superposed edges to overlie in fluid-tight manner both said edges and a marginal zone of the outside face of said strip, which zone subsequently has the other margin of the same strip or one of the margins of a second multi-layer strip applied thereagainst.
7/ Packaging material according to claim 6, wherein the inside layer is extended laterally from both sides so as to form two protective flaps each of which projects beyond the superposed lateral edges on the same side and corresponding to all the other layers of the said strip by a distance which is sufficient to enable it to be folded over said superposed edges and to overlie said edges in fluid-tight manner and also a marginal zone of the outside face of said strip, which zone subsequently has the inside layer of one of the two longitudinal margins of a second multi-layer strip of identical or similar composition to the first strip but without the protective flap pressed thereagainst.
8/ Packaging material according to claim 6, wherein the width of the multi-layer strip between the two margins, i.e. the width measured without taking any protective flap into account, is twice the width of a strip as used for making up packaging from a single strip.
9/ Packaging material according to claim 6, wherein the inside layer including any protective flap has a sterile face on its side that is subsequently directed towards the inside of the packaging, which sterile face is covered by a peel-off protective sheet whose face adjacent thereto is likewise sterile.
10/ Packaging material according to claim 9, wherein the peel-off protective sheet is constituted by the inside layer of a second multi-layer strip, and wherein an intermediate layer of silicone wax or similar material is interposed between the inside layer of the first multi-layer strip and the inside layer of the second multi-layer strip, with the intermediate film being such that it remains attached to one or other of the inside layers during peeling and it moves away from the surface thereof under the effect of pressure.
11/ Packaging material according to claim 9, wherein the peel-off protective sheet is constituted by the inside layer of a second multi-layer strip which adheres directly in peel-off manner to the inside layer of the first multi-layer strip, with each of the inside layers being made of a polyolefin, in particular heat-sealable grafted polyethylene.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9006742A FR2662670A1 (en) | 1990-05-30 | 1990-05-30 | MULTILAYER CLOSED PACKAGING AND PACKAGING MATERIAL. |
| FR9006742 | 1990-05-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2042999A1 true CA2042999A1 (en) | 1991-12-01 |
Family
ID=9397108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2042999 Abandoned CA2042999A1 (en) | 1990-05-30 | 1991-05-22 | Closed multilayer packaging and packaging material |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0459891A1 (en) |
| JP (1) | JPH05124651A (en) |
| AU (1) | AU7733591A (en) |
| CA (1) | CA2042999A1 (en) |
| FR (1) | FR2662670A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113936548B (en) * | 2020-06-29 | 2024-01-19 | 云谷（固安）科技有限公司 | Display module, bending cushion block and manufacturing method of display module |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3363828A (en) * | 1966-12-16 | 1968-01-16 | Mobil Oil Corp | Heat sealable thermoplastic bag |
| US4483018A (en) * | 1981-02-09 | 1984-11-13 | Impakt Products, Inc. | High integrity tamper resistant container |
| SE434041B (en) * | 1982-11-24 | 1984-07-02 | Tetra Pak Int | CUTTING OF PACKAGING CONTAINERS AND SETS AND DEVICE FOR MANUFACTURING THEM |
| DE3316238C1 (en) * | 1983-05-04 | 1984-12-13 | PKL Papier- und Kunststoff-Werke Linnich GmbH, 4000 Düsseldorf | Cardboard web or cut for a light-, air- and liquid-tight, heat-sealable folding box, in particular aseptic liquid packaging |
-
1990
- 1990-05-30 FR FR9006742A patent/FR2662670A1/en not_active Withdrawn
-
1991
- 1991-05-22 CA CA 2042999 patent/CA2042999A1/en not_active Abandoned
- 1991-05-24 AU AU77335/91A patent/AU7733591A/en not_active Abandoned
- 1991-05-29 EP EP91401377A patent/EP0459891A1/en not_active Withdrawn
- 1991-05-30 JP JP15562591A patent/JPH05124651A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05124651A (en) | 1993-05-21 |
| EP0459891A1 (en) | 1991-12-04 |
| AU7733591A (en) | 1991-12-05 |
| FR2662670A1 (en) | 1991-12-06 |
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