CA1224767A - Laminated paperboard container with absorption resistance means and blank for constructing same - Google Patents
Laminated paperboard container with absorption resistance means and blank for constructing sameInfo
- Publication number
- CA1224767A CA1224767A CA000450744A CA450744A CA1224767A CA 1224767 A CA1224767 A CA 1224767A CA 000450744 A CA000450744 A CA 000450744A CA 450744 A CA450744 A CA 450744A CA 1224767 A CA1224767 A CA 1224767A
- Authority
- CA
- Canada
- Prior art keywords
- layer
- per square
- square meter
- grams per
- ionomer resin
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/12—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
Abstract
LAMINATED PAPERBOARD CONTAINER WITH
ABSORPTION RESISTANCE MEANS, AND
BLANK FOR CONSTRUCTING SAME
Abstract The drawings and description disclose a heat sealable container for edible oils and other types of oils, and a blank for constructing same, having a laminated wall construction of suitable oil resistant barriers or layers which are compatible with one another insofar as bonding and sealing are concerned. Such wall construction includes central layers of aluminum foil and fluorochemically treated paperboard secured to one another by a suitable adhesive, an ionomer layer, such as surlyn, formed on each outer paperboard and foil surface, and a layer of thermoplastic material, such as polyethylene, formed on each outer surlyn surface. As an alternate embodiment in some applications, the surlyn layer may be omitted from the foil surface, and the outer layer of thermoplastic material may be applied directly to the foil surface.
ABSORPTION RESISTANCE MEANS, AND
BLANK FOR CONSTRUCTING SAME
Abstract The drawings and description disclose a heat sealable container for edible oils and other types of oils, and a blank for constructing same, having a laminated wall construction of suitable oil resistant barriers or layers which are compatible with one another insofar as bonding and sealing are concerned. Such wall construction includes central layers of aluminum foil and fluorochemically treated paperboard secured to one another by a suitable adhesive, an ionomer layer, such as surlyn, formed on each outer paperboard and foil surface, and a layer of thermoplastic material, such as polyethylene, formed on each outer surlyn surface. As an alternate embodiment in some applications, the surlyn layer may be omitted from the foil surface, and the outer layer of thermoplastic material may be applied directly to the foil surface.
Description
- ~Z2~7G~
L.~lINATED PAPERBOARD CONTAINER WITH
ABSORPTION RESISTA~CE MEANS, A~D
BLANK FOR CONSTRUCTING SAME
05 Technlcal Field This invention relates generally to paperboard containers and, more particularly to a laminated wall construction for same, including oil, sreas , and solvent resistant barriers or layers.
lS Background Art Various industries have found that central packaging for distant markets is a beneficial approach in their business activity and can assist them in developing strong market bases. With the increased emphasis on volume producing and marketing, manv centers of population in reference to a produc. market base may extend across international bou~daries. Thus, out of both necessity and convenience, situations have developed where essential produ~tion marketing areas extend across vast market areas. Hence, longer shelf life for difficult to contain liquids, such as edible oils and motor oil products, is needed so that producers and suppliers can provide uniform top quality merchandise throughout their areas of distribution~
It is well known to include a layer of aluminum foil, which generally serves as a means of preventing oxygen and ultra violet light rays from penetrating through the walls of a paperboard container. ~owever, when the product being packaged is an edible oil or other oil product, additional precautions must be taken to assure a total resistance to penetration or staining ~k ~z2~ ;7 through the wall of the paperboard container to the outside surface over a long shelf life.
Disclosure of the Invention Accordingly, a general ob~ect of the invention is to provide an improved, economical paperboard container which is capable of improving the shelf life of oils.
Another object of the invention is to provide a container having an improved wall construction of suitable oil and grease resistant barriers or layers which are compatible with one another insofar as bonding and sealing are concerned.
A further object of the invention is to provide a paperboard container for retaining edible oils and other type oils, wherein the wall construction includes a suitable combination of layers of thermoplastic material, such as polyethylene, iono~ers, such as surlyns, and aluminum foil, in conjunction with bleached or unbleached, and suitably treated paperboard material, so as to bond to one another, seal properly after filling, and be resistant to staining on the outside .hereof over an extended shelf life.
These and other objects and advantages of the invention will be apparent when reference is made to the following description and accompanying drawings, wherein:
Brief Description of Drawings Figure 1 is a layout view of the inside surface of a container blank body, to which the present invention could be adapted;
4'-~7 Figure 2 is a flat side seamed blank made from the container blanX shown in Figure 1, and showing the outside surface thereof;
05 Figure 3 is a perspective view of a container fabricated from the blan~s shown in Figures 1 and 2;
Figure 4 is a fragmentary cross-sectional view through a side panel taken on line 4-4 of Fisure 3, and looking in the direction of the arrows; and Figure 5 is a figure similar to Figure 4, showing an alternate embodiment of the invention.
Best Mode of Caxrying Out the Invention Referring now to the drawings in greater detail, Figure 1 illustrates the inside surface of a container blank 10. The container blank 10 is separated into three general groups by staggered score lines 12 and 14. The group above staggered score line 12 is referred to as top closure group 16. The group between staggered score lines 12 and 14 are referred to as body group 18. The group below staggered score line 14 is referred to ~s bottom closure group 20. The container blank 10 is defined on its sides by side edges 22 and 24 and is separated vertically by a series of score lines 26, 28, 30 and 32. The score lines 26, 28, 30 and 32 divide the group body 18 into side wall panels 34, 36, 38 and 40 and side seam flap 42.
The top closure group 16 is mounted on the upper end of body group 18. Triangular end panels 44 and 46 are mounted to upper ends of the side wall panels 34 and 38, respectively. The triangular end panel 44 l~as a pair ol adjacent fold-bac~ panels 48 and 50 mounted on i~s upper sides and the triangular end panel 46 has a pair ~f fold-back end panels 52 and 54 ~ounted on its upper ~2Z~76~7 sides. A pair of inner rib panels 56 and 58 are mounted adjacent the fold-back panels 48 and 50, respectively. A
pair of inner rib panels 60 and 62 are mounted adjacent the fold-back panels 52 and 54, respectively.
A pair of roof panels 64 and 66 are mounted to the body group 18 at the upper end of the wide wall panels 36 and 40, respectively. A pair of outer sealing rib panels 68 and 70 are mounted at the upper end of the roof panels 64 and 66, respectively. ~ top edge member 72 defines the upper free end of top closure group 16. A complete description of the top closure group 16 is not necessary to understand the principles of the present invention.
However, reference is made to U.S. Patent 3,270,940 which issued September 6, 1966 for a complete description of a top closure group similar to top closure group 16.
The bottom closure group 20 is mounted on the lower end of body group 18. A tuck-in flap 74 and a tuck-out flap 76 are mounted at the lower ends of the side wall panels 34 and 38, respectively, along the staggered score line 14.
A first minor flap 78 and second minor flap 80 are mount~d at the bottom of the side wall panels 36 and ~0, respectively, along the staggered score line 14. A pair of fold-back panels 82 and 84 connect the first minor flap 78 to the tuck-in flap 74 and the tuck-out flap 76, respectively. The second minor flap 80 is connected to the tuck-out flap 76 and the side seam flap 42 by fold-back panels 86 and 88, respectively.
A bottom edge member 90 defines the free end of the bottom closure group 20. The bottom edge member 90 is substantially defined by three sections at the bottom edge of the tuck-in flap 74. These three sections or portions are defined by a cam edge 92, a straight ed~e 9 and a cam edge 96. The bottom edge member 90 is defined lZ;Z47t~7 as an edge portion 98 along the free edge of fold-back panels 82 and 84. The tuck-out panel 76 has its bottom edge member 90 defined by a free edge portion which is substantiaily an extension of the score line 28, a 05 straight edge 100 and a diagonal edge 102. The free edge portion of the fold-back panels 86 and 88 is defined by an edge portion 104. The side seam flap 42 has its portion of ~he bottom edge member 90 defined by a diagonal edge 106.
When the container blank 10 is being prepared for assembly as a container it will be side seamed by having the roof panel 66, the side wall panel 40 and the second minor flap 80 and its associated fold-back panels 86 and 88 along with the side seam flap 42 folded about the score line 30 moving their inside surfaces into contact with the inside surfaces of the triangular end panel 46, the side wall panel 38 and the tuck-out flap 76 and the side seam flap 42's inside surface extending past the score line 28.
The triangular end panel 44, the side wall panel 34 and the tuck-in flap 74 will be rotated about the score line 26 so their inside surfaces will move toward ~he inside surface of the roof panel 64, the side wall panel 36 and the first minor flap 78 and the fold-back panels 82 and 84. The side edge 22 will then be substantially aligned with the score line 32 and its associated ~dge portion will be aligned with and in contact with the outside surface of the side seam flap 42. The outside surface of side seam flap 42 is secured to the inside surface of the various panel and flap members being positioned along the side edge 22. This can be accomplished in many ways. One of the preferred methods is heat sealing which will establish a surface bond ~, between the above stated members. The container blan~ 10 can then be opened into tubular form as illustra~ed in Figure 3 as a tubular container member 108.
12ZL~767 In normal production operations the bottom closure group 20 will be closed and sealed, the contents will be passed into the tubular container member 108 and then the top closure group 16 will be closed, as illustrated in 05 Figure 3.
The forming of the side seam blank and the closlng of the top closure group is covered in detail in the above mentioned U.S. Patent 3,270,940. The diagonal edge 106 and the diagonal edge 102 are provided so that when the container is constructed there will not be an extra layer of paper as the tuck-out flap 76 will not extend over the side seam flap 42 when the bottom closure group 20 is in constructed form. This is covered in detail in U.S. Patent Nos. 3,120,335 and 4,341,340.
Referring now to Figure 4, wherein a cross-sectional view of the wall of the container wall is represented, an arrow I identifies the inside surface of the container 108, and an arrow O identifies the cutside surface of the container 108. The identification of the progressive layers from the inside to the outside is as follows. A
uniform layer 110 is the inside coating, which consists of a suitable thermoplastic material, such as a low density polyethylene. A layer 112 consists of a selected sodium ionomer type surlyn. Such surlyn is selected for its oil resistant quality. The next layer 114 is the paperboard material which is the main ma'erial of the container 108 body. A layer 116 consists of a suitable adhesive means, such as a zinc ionomer type surlyn, and serves to bind a layer 118 of aluminum foil to the outside surface of the paperboard layer 114. The aluminum foil layer 118 serves not only as an attractive outer appearance, but also as a barrier means to prevent the transfer therethrough of any stains from oils, greases and solvents. This layer may, if desired, consist of a matalized polyester, in lieu of aluminum foil. Next is another adhesive layer 120 which may be a ~z247~7 zinc ionomer type surlyn. Finally, a layer 122 of low density polyethylene, like the inside layer 110, forms a uniform outside coating or barrier.
05 Figure 4 is not drawn to scale, and the following are examples of ranges of suitable weights per square meter of the material of the respective layers which could be used in a practical embodiment of a container in accordance to the invention: layer 110 = 20 to 35 grams (.00085"-.00142"), layer 112 = 30 io 40 grams (.00125"-.00167"), layer 114 = 250 to 550 gram~
(.0123"-.0254"), layer 116 = 10 to 15 gra;ns (.00042"-.00063"), layer 118 = 16 to 25 grams (.00024"-.00037"), layer 120 = 12 to 17 grams (.00050"-.00075"), and layer 122 = 12 to 17 grams (.00050"-.00075"). A specific combination which has been found to be satisfa~tory for a quart or liter size container consists of an inside polyethylene layer 110 of 25 grams per square meter, a sodium ionomer type surlyn layer 112 of 40 grams per square meter, a paperboard layer 114 of 320 grams per square meter, an intermediate zinc ionomer type surlyn layer 116 of 15 grams per square meter, an aluminum foil layer 118 of 25 grams per square meter, another zinc ionomer type surlyn layer 12Q of 15 grams per square meter, and an outside polyethylene layer 122 of 15 grams per square meter, for a total weight of 455 grams per square meter. For a half pint or 250 milli-liter size container, the layer 110 is preferably 20 grams per square meter, and the layer 114 is 250 grams per square meter; for a pint or 500 milli-liter size, 20 for layer 110 and 275 for layer 114; for a one half gallon or 2 liter size, 30 for layer 110 and 475 for layer 114; and for a gallon or 4 liter size, 35 for iayer 110 and 540 for layer 114.
For some oil product applications it may be sufficient to omit the aluminum foil layer 118 and the ~224~67 adjacent adhesive layers 116 and 120 wi.hout encounterin~
staining on the outside surface.
Additionally, in some applications it may be 05 satisfactory to omit only the zinc ionomer type surlvn layer 120 (Figure 5), and vary the thicknesses of some or all the remaining layers. One such arrangement of layers, as viewed from inside to outside of a container wall, which tests have shown to be satisfactory, includes the following weights per square meter: an inside layer 110 of low density polyethylene on the order of 16 grams, a selected sodium ionomer type surlyn layer 112 on the order of 50 grams, a paperboard layer 114 ranging between 250-500 grams, depending upon container size, fluorochemically treated as described below, an intermediate zinc ionomer type surlyn layer 116 on the order of 19 grams, an aluminum foil layer 118 of between 16 and 25 grams, and an outside layer 122 of low density polyethylene on the order of 14 grams. Depending upon container size, it may be preferable to use layers 110, 112, 116 and 122 varying within the following respective ranges of weights in grams per square meter: 15-35;
35-60; 10-20; and 12-17.
While the sodium ionomer surlyn and aluminum foil layers serve to resist penetration and staining by the confined oil, additionally, the paperboard itself is treated as described below to assure a high commercial quality oil container.
For containers o the type describ~d above, the paperboard consists or paperboard made from virgin pulps, with such board being either bleached sulphate, or natural, i.e., unbleached, sulphate, the term sulphate also being known as "Kraft". When used to contain edible oils or other oil products, such paperboard may b~
~ treated with fluorochemical paper sizing, such as "2Onyl RP", a commercially available product of E.I. du Pont de ~ZZ4767 --1 o--Nemours and Company, or "Scotchban", a commercially available product of Commercial Chemicals Division of 3M
Company, in order to have resistance not only at its inner cut edges but at all cracks or pinholes to 05 penetration by such oil products. Along with treatment in this manner, it may be beneficial for the inner cut edges to be "skived" or folded over in some one of several known manners, such as that shown and described in U.S. Patent No. 4,254,693, resulting in a carton edge structure, as shown in U.S. Patent No. 4,239,150.
Industrial ApPlicability It should be apparent that the invention provides an improved paperboard package for carrying oils, greases, and solvents.
It should also be apparent that the respective layers of materials described above may be varied in thickness independently of the other layers to suit particular liquid packaging applications.
While but two general embodiments of the invention have been described, other modifications thereof are possible.
, .
L.~lINATED PAPERBOARD CONTAINER WITH
ABSORPTION RESISTA~CE MEANS, A~D
BLANK FOR CONSTRUCTING SAME
05 Technlcal Field This invention relates generally to paperboard containers and, more particularly to a laminated wall construction for same, including oil, sreas , and solvent resistant barriers or layers.
lS Background Art Various industries have found that central packaging for distant markets is a beneficial approach in their business activity and can assist them in developing strong market bases. With the increased emphasis on volume producing and marketing, manv centers of population in reference to a produc. market base may extend across international bou~daries. Thus, out of both necessity and convenience, situations have developed where essential produ~tion marketing areas extend across vast market areas. Hence, longer shelf life for difficult to contain liquids, such as edible oils and motor oil products, is needed so that producers and suppliers can provide uniform top quality merchandise throughout their areas of distribution~
It is well known to include a layer of aluminum foil, which generally serves as a means of preventing oxygen and ultra violet light rays from penetrating through the walls of a paperboard container. ~owever, when the product being packaged is an edible oil or other oil product, additional precautions must be taken to assure a total resistance to penetration or staining ~k ~z2~ ;7 through the wall of the paperboard container to the outside surface over a long shelf life.
Disclosure of the Invention Accordingly, a general ob~ect of the invention is to provide an improved, economical paperboard container which is capable of improving the shelf life of oils.
Another object of the invention is to provide a container having an improved wall construction of suitable oil and grease resistant barriers or layers which are compatible with one another insofar as bonding and sealing are concerned.
A further object of the invention is to provide a paperboard container for retaining edible oils and other type oils, wherein the wall construction includes a suitable combination of layers of thermoplastic material, such as polyethylene, iono~ers, such as surlyns, and aluminum foil, in conjunction with bleached or unbleached, and suitably treated paperboard material, so as to bond to one another, seal properly after filling, and be resistant to staining on the outside .hereof over an extended shelf life.
These and other objects and advantages of the invention will be apparent when reference is made to the following description and accompanying drawings, wherein:
Brief Description of Drawings Figure 1 is a layout view of the inside surface of a container blank body, to which the present invention could be adapted;
4'-~7 Figure 2 is a flat side seamed blank made from the container blanX shown in Figure 1, and showing the outside surface thereof;
05 Figure 3 is a perspective view of a container fabricated from the blan~s shown in Figures 1 and 2;
Figure 4 is a fragmentary cross-sectional view through a side panel taken on line 4-4 of Fisure 3, and looking in the direction of the arrows; and Figure 5 is a figure similar to Figure 4, showing an alternate embodiment of the invention.
Best Mode of Caxrying Out the Invention Referring now to the drawings in greater detail, Figure 1 illustrates the inside surface of a container blank 10. The container blank 10 is separated into three general groups by staggered score lines 12 and 14. The group above staggered score line 12 is referred to as top closure group 16. The group between staggered score lines 12 and 14 are referred to as body group 18. The group below staggered score line 14 is referred to ~s bottom closure group 20. The container blank 10 is defined on its sides by side edges 22 and 24 and is separated vertically by a series of score lines 26, 28, 30 and 32. The score lines 26, 28, 30 and 32 divide the group body 18 into side wall panels 34, 36, 38 and 40 and side seam flap 42.
The top closure group 16 is mounted on the upper end of body group 18. Triangular end panels 44 and 46 are mounted to upper ends of the side wall panels 34 and 38, respectively. The triangular end panel 44 l~as a pair ol adjacent fold-bac~ panels 48 and 50 mounted on i~s upper sides and the triangular end panel 46 has a pair ~f fold-back end panels 52 and 54 ~ounted on its upper ~2Z~76~7 sides. A pair of inner rib panels 56 and 58 are mounted adjacent the fold-back panels 48 and 50, respectively. A
pair of inner rib panels 60 and 62 are mounted adjacent the fold-back panels 52 and 54, respectively.
A pair of roof panels 64 and 66 are mounted to the body group 18 at the upper end of the wide wall panels 36 and 40, respectively. A pair of outer sealing rib panels 68 and 70 are mounted at the upper end of the roof panels 64 and 66, respectively. ~ top edge member 72 defines the upper free end of top closure group 16. A complete description of the top closure group 16 is not necessary to understand the principles of the present invention.
However, reference is made to U.S. Patent 3,270,940 which issued September 6, 1966 for a complete description of a top closure group similar to top closure group 16.
The bottom closure group 20 is mounted on the lower end of body group 18. A tuck-in flap 74 and a tuck-out flap 76 are mounted at the lower ends of the side wall panels 34 and 38, respectively, along the staggered score line 14.
A first minor flap 78 and second minor flap 80 are mount~d at the bottom of the side wall panels 36 and ~0, respectively, along the staggered score line 14. A pair of fold-back panels 82 and 84 connect the first minor flap 78 to the tuck-in flap 74 and the tuck-out flap 76, respectively. The second minor flap 80 is connected to the tuck-out flap 76 and the side seam flap 42 by fold-back panels 86 and 88, respectively.
A bottom edge member 90 defines the free end of the bottom closure group 20. The bottom edge member 90 is substantially defined by three sections at the bottom edge of the tuck-in flap 74. These three sections or portions are defined by a cam edge 92, a straight ed~e 9 and a cam edge 96. The bottom edge member 90 is defined lZ;Z47t~7 as an edge portion 98 along the free edge of fold-back panels 82 and 84. The tuck-out panel 76 has its bottom edge member 90 defined by a free edge portion which is substantiaily an extension of the score line 28, a 05 straight edge 100 and a diagonal edge 102. The free edge portion of the fold-back panels 86 and 88 is defined by an edge portion 104. The side seam flap 42 has its portion of ~he bottom edge member 90 defined by a diagonal edge 106.
When the container blank 10 is being prepared for assembly as a container it will be side seamed by having the roof panel 66, the side wall panel 40 and the second minor flap 80 and its associated fold-back panels 86 and 88 along with the side seam flap 42 folded about the score line 30 moving their inside surfaces into contact with the inside surfaces of the triangular end panel 46, the side wall panel 38 and the tuck-out flap 76 and the side seam flap 42's inside surface extending past the score line 28.
The triangular end panel 44, the side wall panel 34 and the tuck-in flap 74 will be rotated about the score line 26 so their inside surfaces will move toward ~he inside surface of the roof panel 64, the side wall panel 36 and the first minor flap 78 and the fold-back panels 82 and 84. The side edge 22 will then be substantially aligned with the score line 32 and its associated ~dge portion will be aligned with and in contact with the outside surface of the side seam flap 42. The outside surface of side seam flap 42 is secured to the inside surface of the various panel and flap members being positioned along the side edge 22. This can be accomplished in many ways. One of the preferred methods is heat sealing which will establish a surface bond ~, between the above stated members. The container blan~ 10 can then be opened into tubular form as illustra~ed in Figure 3 as a tubular container member 108.
12ZL~767 In normal production operations the bottom closure group 20 will be closed and sealed, the contents will be passed into the tubular container member 108 and then the top closure group 16 will be closed, as illustrated in 05 Figure 3.
The forming of the side seam blank and the closlng of the top closure group is covered in detail in the above mentioned U.S. Patent 3,270,940. The diagonal edge 106 and the diagonal edge 102 are provided so that when the container is constructed there will not be an extra layer of paper as the tuck-out flap 76 will not extend over the side seam flap 42 when the bottom closure group 20 is in constructed form. This is covered in detail in U.S. Patent Nos. 3,120,335 and 4,341,340.
Referring now to Figure 4, wherein a cross-sectional view of the wall of the container wall is represented, an arrow I identifies the inside surface of the container 108, and an arrow O identifies the cutside surface of the container 108. The identification of the progressive layers from the inside to the outside is as follows. A
uniform layer 110 is the inside coating, which consists of a suitable thermoplastic material, such as a low density polyethylene. A layer 112 consists of a selected sodium ionomer type surlyn. Such surlyn is selected for its oil resistant quality. The next layer 114 is the paperboard material which is the main ma'erial of the container 108 body. A layer 116 consists of a suitable adhesive means, such as a zinc ionomer type surlyn, and serves to bind a layer 118 of aluminum foil to the outside surface of the paperboard layer 114. The aluminum foil layer 118 serves not only as an attractive outer appearance, but also as a barrier means to prevent the transfer therethrough of any stains from oils, greases and solvents. This layer may, if desired, consist of a matalized polyester, in lieu of aluminum foil. Next is another adhesive layer 120 which may be a ~z247~7 zinc ionomer type surlyn. Finally, a layer 122 of low density polyethylene, like the inside layer 110, forms a uniform outside coating or barrier.
05 Figure 4 is not drawn to scale, and the following are examples of ranges of suitable weights per square meter of the material of the respective layers which could be used in a practical embodiment of a container in accordance to the invention: layer 110 = 20 to 35 grams (.00085"-.00142"), layer 112 = 30 io 40 grams (.00125"-.00167"), layer 114 = 250 to 550 gram~
(.0123"-.0254"), layer 116 = 10 to 15 gra;ns (.00042"-.00063"), layer 118 = 16 to 25 grams (.00024"-.00037"), layer 120 = 12 to 17 grams (.00050"-.00075"), and layer 122 = 12 to 17 grams (.00050"-.00075"). A specific combination which has been found to be satisfa~tory for a quart or liter size container consists of an inside polyethylene layer 110 of 25 grams per square meter, a sodium ionomer type surlyn layer 112 of 40 grams per square meter, a paperboard layer 114 of 320 grams per square meter, an intermediate zinc ionomer type surlyn layer 116 of 15 grams per square meter, an aluminum foil layer 118 of 25 grams per square meter, another zinc ionomer type surlyn layer 12Q of 15 grams per square meter, and an outside polyethylene layer 122 of 15 grams per square meter, for a total weight of 455 grams per square meter. For a half pint or 250 milli-liter size container, the layer 110 is preferably 20 grams per square meter, and the layer 114 is 250 grams per square meter; for a pint or 500 milli-liter size, 20 for layer 110 and 275 for layer 114; for a one half gallon or 2 liter size, 30 for layer 110 and 475 for layer 114; and for a gallon or 4 liter size, 35 for iayer 110 and 540 for layer 114.
For some oil product applications it may be sufficient to omit the aluminum foil layer 118 and the ~224~67 adjacent adhesive layers 116 and 120 wi.hout encounterin~
staining on the outside surface.
Additionally, in some applications it may be 05 satisfactory to omit only the zinc ionomer type surlvn layer 120 (Figure 5), and vary the thicknesses of some or all the remaining layers. One such arrangement of layers, as viewed from inside to outside of a container wall, which tests have shown to be satisfactory, includes the following weights per square meter: an inside layer 110 of low density polyethylene on the order of 16 grams, a selected sodium ionomer type surlyn layer 112 on the order of 50 grams, a paperboard layer 114 ranging between 250-500 grams, depending upon container size, fluorochemically treated as described below, an intermediate zinc ionomer type surlyn layer 116 on the order of 19 grams, an aluminum foil layer 118 of between 16 and 25 grams, and an outside layer 122 of low density polyethylene on the order of 14 grams. Depending upon container size, it may be preferable to use layers 110, 112, 116 and 122 varying within the following respective ranges of weights in grams per square meter: 15-35;
35-60; 10-20; and 12-17.
While the sodium ionomer surlyn and aluminum foil layers serve to resist penetration and staining by the confined oil, additionally, the paperboard itself is treated as described below to assure a high commercial quality oil container.
For containers o the type describ~d above, the paperboard consists or paperboard made from virgin pulps, with such board being either bleached sulphate, or natural, i.e., unbleached, sulphate, the term sulphate also being known as "Kraft". When used to contain edible oils or other oil products, such paperboard may b~
~ treated with fluorochemical paper sizing, such as "2Onyl RP", a commercially available product of E.I. du Pont de ~ZZ4767 --1 o--Nemours and Company, or "Scotchban", a commercially available product of Commercial Chemicals Division of 3M
Company, in order to have resistance not only at its inner cut edges but at all cracks or pinholes to 05 penetration by such oil products. Along with treatment in this manner, it may be beneficial for the inner cut edges to be "skived" or folded over in some one of several known manners, such as that shown and described in U.S. Patent No. 4,254,693, resulting in a carton edge structure, as shown in U.S. Patent No. 4,239,150.
Industrial ApPlicability It should be apparent that the invention provides an improved paperboard package for carrying oils, greases, and solvents.
It should also be apparent that the respective layers of materials described above may be varied in thickness independently of the other layers to suit particular liquid packaging applications.
While but two general embodiments of the invention have been described, other modifications thereof are possible.
, .
Claims (23)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A one-piece foldable, laminated blank for forming a sealed liquid container, said blank comprising:
(a) a layer of fluorochemically treated kraft paperboard material having a predetermined weight per given area;
(b) a first layer of ionomer resin having a predetermined weight per given area and forming a uniform coating on one surface of said layer of kraft paperboard material;
(c) a layer of adhesive having a predetermined weight per given area and formed uniformly on the other surface of said layer of kraft paperboard material;
(d) a layer of metallized material having a predetermined weight per given area and secured by said adhesive to said layer of kraft paperboard material;
(e) a second layer of ionomer resin having a predetermined weight per given area and forming a uniform coating on said layer of metallized material; and (f) first and second layers of thermoplastic material having a predetermined weight per given area and forming uniform inner and outer coatings on said first and second layers of ionomer resin, respectively.
(a) a layer of fluorochemically treated kraft paperboard material having a predetermined weight per given area;
(b) a first layer of ionomer resin having a predetermined weight per given area and forming a uniform coating on one surface of said layer of kraft paperboard material;
(c) a layer of adhesive having a predetermined weight per given area and formed uniformly on the other surface of said layer of kraft paperboard material;
(d) a layer of metallized material having a predetermined weight per given area and secured by said adhesive to said layer of kraft paperboard material;
(e) a second layer of ionomer resin having a predetermined weight per given area and forming a uniform coating on said layer of metallized material; and (f) first and second layers of thermoplastic material having a predetermined weight per given area and forming uniform inner and outer coatings on said first and second layers of ionomer resin, respectively.
2. The laminated blank described in claim 1, wherein said layer of kraft paperboard material weighs between 250 and 550 grams per square meter.
3. The laminated blank described in claim 1, wherein said first layer of ionomer resin weighs between 30 and 40 grams per square meter.
4. The laminated blank described in claim 3, wherein said first layer of ionomer resin is a sodium ionomer type resin.
5. The laminated blank described in claim 1, wherein said layer of adhesive weighs between 10 and 15 grams per square meter.
6. The laminated blank described in claim 5, wherein said layer of adhesive consists of an ionomer resin material.
7. The laminated blank described in claim 6, wherein said ionomer resin material is a zinc ionomer type resin.
8. The laminated blank described in claim 1, wherein said layer of metallized material weighs between 16 and 25 grams per square meter.
9. The laminated blank described in claim 8, wherein said layer of metallized material consists of aluminum foil.
10. The laminated blank described in claim 8, wherein said layer of metallized material consists of a metallized polyester.
11. The laminated blank described in claim 1, wherein said second layer of ionomer resin weighs between 12 and 17 grams per square meter.
12. The laminated blank described in claim 11, wherein said second layer of ionomer resin is a sodium ionomer type resin.
13. The laminated blank described in claim 1, wherein said first layer of thermoplastic material weighs between 20 and 35 grams per square meter.
14. The laminated blank described in claim 1, wherein said second layer of thermoplastic material weighs between 12 and 17 grams per square meter.
15. The laminated blank described in claim 1, wherein each of said first and second layers of thermoplastic material consists of polyethylene.
16. A one piece foldable, laminated blank for forming a sealed liquid container, said blank comprising:
(a) a layer of fluorochemically treated kraft paperboard material weighing on the order of 320 grams per square meter;
(b) a first layer of ionomer resin weighing on the order of 40 grams per square meter and forming a uniform coating on one surface of said layer of kraft paperboard material;
(c) a second layer of ionomer resin weighing on the order of 15 grams per square meter and formed uniformly on the other surface of said layer of kraft paperboard material;
(d) a layer of aluminum foil weighing on the order of 25 grams per square meter and secured by said second layer of ionomer resin to said layer of kraft paperboard material;
(e) a third layer of ionomer resin weighing on the order of 15 grams per square meter and forming a uniform coating on said layer of aluminum foil; and (f) first and second layers of thermoplastic material weighing 25 and 15 grams per square meter, respectively, and forming uniform inner and outer coatings on said first and third layers of ionomer resin, respectively.
(a) a layer of fluorochemically treated kraft paperboard material weighing on the order of 320 grams per square meter;
(b) a first layer of ionomer resin weighing on the order of 40 grams per square meter and forming a uniform coating on one surface of said layer of kraft paperboard material;
(c) a second layer of ionomer resin weighing on the order of 15 grams per square meter and formed uniformly on the other surface of said layer of kraft paperboard material;
(d) a layer of aluminum foil weighing on the order of 25 grams per square meter and secured by said second layer of ionomer resin to said layer of kraft paperboard material;
(e) a third layer of ionomer resin weighing on the order of 15 grams per square meter and forming a uniform coating on said layer of aluminum foil; and (f) first and second layers of thermoplastic material weighing 25 and 15 grams per square meter, respectively, and forming uniform inner and outer coatings on said first and third layers of ionomer resin, respectively.
17. An oil, grease, and solvent resistant, heat-sealed container formed from a one-piece foldable laminated blank of sheet material, said container comprising four side wall panels forming a tubular body of rectangular cross section having a fold-in top closure and a fold-in bottom closure;
said sheet material comprising first and second thicknesses of heat-sealable ionomer resin thermally bonded to opposite sides of a third thickness of paperboard, a fourth thickness of aluminum foil bonded between said second thickness of heat-sealable ionomer resin and a fifth thickness of heat-sealable ionomer resin, and sixth and seventh thicknesses of heat-sealable polyethylene thermally bonded as the respective inner and outer surfaces on the first and fifth thicknesses of heat-sealable ionomer resin, to form a liquid-proof semi-rigid container.
said sheet material comprising first and second thicknesses of heat-sealable ionomer resin thermally bonded to opposite sides of a third thickness of paperboard, a fourth thickness of aluminum foil bonded between said second thickness of heat-sealable ionomer resin and a fifth thickness of heat-sealable ionomer resin, and sixth and seventh thicknesses of heat-sealable polyethylene thermally bonded as the respective inner and outer surfaces on the first and fifth thicknesses of heat-sealable ionomer resin, to form a liquid-proof semi-rigid container.
18. An oil, grease, and solvent resistant, heat-sealed container formed from a one-piece foldable laminated blank of paperboard said container comprising:
(a) four side wall panels forming a tubular body of rectangular cross section having fold-in top and bottom closures;
(b) said container being formed from fluoro-chemically treated paperboard weighing on the order of 320 grams per square meter and thermally bonded between an inner layer of ionomer resin and an outer layer of adhesive weighing, respectively, on the order of 40 and 15 grams per square meter.
(c) a layer of aluminum foil weighing on the order of 25 grams per square meter secured to said adhesive;
(d) a layer of ionomer resin formed on the layer of aluminum foil, weighing on the order of 15 grams per square meter, and (e) a layer of polyethylene formed on each of the ionomer resin layers, weighing on the order of 15 grams per square meter adjacent the 15 gram per square meter ionomer resin layer, and 25 grams per square meter adjacent the 40 gram per square meter ionomer resin layer.
(a) four side wall panels forming a tubular body of rectangular cross section having fold-in top and bottom closures;
(b) said container being formed from fluoro-chemically treated paperboard weighing on the order of 320 grams per square meter and thermally bonded between an inner layer of ionomer resin and an outer layer of adhesive weighing, respectively, on the order of 40 and 15 grams per square meter.
(c) a layer of aluminum foil weighing on the order of 25 grams per square meter secured to said adhesive;
(d) a layer of ionomer resin formed on the layer of aluminum foil, weighing on the order of 15 grams per square meter, and (e) a layer of polyethylene formed on each of the ionomer resin layers, weighing on the order of 15 grams per square meter adjacent the 15 gram per square meter ionomer resin layer, and 25 grams per square meter adjacent the 40 gram per square meter ionomer resin layer.
19. An oil, grease, and solvent resistant, heat-sealed container formed from a one-piece foldable laminated blank of paperboard said container comprising:
(a) four side wall panels forming a tubular body of rectangular cross section having fold-in top and bottom closures;
(b) said container being formed from fluoro-chemically treated paperboard weighing on the order of 320 grams per square meter and thermally bonded between an inner layer of ionomer resin and an outer layer of adhesive weighing, respectively, on the order of 40 and 15 grams per squre meter.
(c) a layer of metallized polyester weighing on the order of 18 grams per square meter secured to said adhesive;
(d) a layer of ionomer resin formed on the layer of metallized polyester, weighing on the order of 15 grams per square meter, and (e) a layer of polyethylene formed on each of the ionomer resin layers, weighing on the order of 15 grams per square meter adjacent the 15 gram per square meter ionomer resin layer, and 25 grams per square meter adjacent the 40 gram per square meter ionomer resin layer.
(a) four side wall panels forming a tubular body of rectangular cross section having fold-in top and bottom closures;
(b) said container being formed from fluoro-chemically treated paperboard weighing on the order of 320 grams per square meter and thermally bonded between an inner layer of ionomer resin and an outer layer of adhesive weighing, respectively, on the order of 40 and 15 grams per squre meter.
(c) a layer of metallized polyester weighing on the order of 18 grams per square meter secured to said adhesive;
(d) a layer of ionomer resin formed on the layer of metallized polyester, weighing on the order of 15 grams per square meter, and (e) a layer of polyethylene formed on each of the ionomer resin layers, weighing on the order of 15 grams per square meter adjacent the 15 gram per square meter ionomer resin layer, and 25 grams per square meter adjacent the 40 gram per square meter ionomer resin layer.
20. A one-piece foldable, laminated blank for forming a sealed liquid container, said blank comprising:
(a) a layer of fluorochemically treated paperboard weighing between 250 and 500 grams per square meter;
(b) a layer of selected ionomer resin weighing in the range of 35-60 grams per square meter and forming a uniform coating on one surface of said layer of treated paperboard;
(c) a layer of an intermediate adhesive in the range of 10-20 grams per square meter and forming a uniform coating on the other surface of said layer of treated paperboard;
(d) a layer of aluminum foil weighing between 16 and 25 grams and secured to said layer of adhesive; and (e) first and second layers of thermoplastic material weighing in the ranges of 15-35 and 12-24 grams per square meter, respectively, and forming uniform inner and outer coatings on said layer of ionomer resin and said layer of aluminum foil, respectively.
(a) a layer of fluorochemically treated paperboard weighing between 250 and 500 grams per square meter;
(b) a layer of selected ionomer resin weighing in the range of 35-60 grams per square meter and forming a uniform coating on one surface of said layer of treated paperboard;
(c) a layer of an intermediate adhesive in the range of 10-20 grams per square meter and forming a uniform coating on the other surface of said layer of treated paperboard;
(d) a layer of aluminum foil weighing between 16 and 25 grams and secured to said layer of adhesive; and (e) first and second layers of thermoplastic material weighing in the ranges of 15-35 and 12-24 grams per square meter, respectively, and forming uniform inner and outer coatings on said layer of ionomer resin and said layer of aluminum foil, respectively.
21. The laminated blank described in claim 20, wherein the weight of the ionomer resin is 50 grams per square meter; the weight of the intermediate adhesive is 19 grams per square meter; the weight of the first layer of thermo-plastic material is 16 grams per square meter; and the weight of the second layer of thermoplastic material is 19 grams per square meter.
22. The laminated blank described in claim 21, wherein the ionomer resin is a sodium ionomer type Surlyn.
23. The laminated blank described in claim 21, wherein the adhesive is a zinc ionomer type Surlyn.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/479,603 US4489112A (en) | 1983-03-28 | 1983-03-28 | Laminated paperboard container with absorption resistance means, and blank for constructing same |
| US479,603 | 1983-03-28 | ||
| US06/587,748 US4537815A (en) | 1983-03-28 | 1984-03-09 | Laminated paperboard container with absorption resistance means, and blank for constructing same |
| US587,748 | 1984-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1224767A true CA1224767A (en) | 1987-07-28 |
Family
ID=27046288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000450744A Expired CA1224767A (en) | 1983-03-28 | 1984-03-28 | Laminated paperboard container with absorption resistance means and blank for constructing same |
Country Status (6)
| Country | Link |
|---|---|
| AU (1) | AU567152B2 (en) |
| CA (1) | CA1224767A (en) |
| DK (1) | DK168984A (en) |
| ES (1) | ES289447Y (en) |
| NO (1) | NO164008B (en) |
| TR (1) | TR22018A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3621742A1 (en) * | 1986-06-28 | 1988-01-14 | Altstaedter Verpack Vertrieb | LIQUID PACK WITH TAPERED TOP |
| SE503218C2 (en) * | 1994-10-27 | 1996-04-22 | Tetra Laval Holdings & Finance | Packaging container of laminated material |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3972467A (en) * | 1974-08-06 | 1976-08-03 | International Paper Company | Paper-board laminate |
| NL7611960A (en) * | 1976-10-28 | 1978-05-03 | Leer Koninklijke Emballage | PACKAGING MATERIAL AND PACKAGING MADE THEREOF. |
| JPS5725949A (en) * | 1980-07-22 | 1982-02-10 | Toyo Ink Mfg Co | Manufacture of laminate |
-
1984
- 1984-03-26 AU AU26080/84A patent/AU567152B2/en not_active Ceased
- 1984-03-27 DK DK168984A patent/DK168984A/en not_active IP Right Cessation
- 1984-03-27 ES ES1984289447U patent/ES289447Y/en not_active Expired
- 1984-03-27 TR TR2201884A patent/TR22018A/en unknown
- 1984-03-28 NO NO841241A patent/NO164008B/en unknown
- 1984-03-28 CA CA000450744A patent/CA1224767A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES289447U (en) | 1986-02-16 |
| NO164008B (en) | 1990-05-14 |
| ES289447Y (en) | 1986-10-01 |
| AU2608084A (en) | 1984-10-04 |
| TR22018A (en) | 1986-01-13 |
| DK168984D0 (en) | 1984-03-27 |
| NO841241L (en) | 1984-10-01 |
| DK168984A (en) | 1984-09-29 |
| AU567152B2 (en) | 1987-11-12 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |