CA1242174A - Resealable paperboard package - Google Patents
Resealable paperboard packageInfo
- Publication number
- CA1242174A CA1242174A CA000472035A CA472035A CA1242174A CA 1242174 A CA1242174 A CA 1242174A CA 000472035 A CA000472035 A CA 000472035A CA 472035 A CA472035 A CA 472035A CA 1242174 A CA1242174 A CA 1242174A
- Authority
- CA
- Canada
- Prior art keywords
- base
- panel
- package
- panels
- side panels
- 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
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- 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
- B65D5/64—Lids
- B65D5/68—Telescope flanged lids
-
- 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
- B65D5/02—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 by folding or erecting a single blank to form a tubular body with or without subsequent folding operations, or the addition of separate elements, to close the ends of the body
- B65D5/0272—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 by folding or erecting a single blank to form a tubular body with or without subsequent folding operations, or the addition of separate elements, to close the ends of the body with end closures formed by applying a web on the edge of the body, and subsequent inward folding of flaps
-
- 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
- B65D5/54—Lines of weakness to facilitate opening of container or dividing it into separate parts by cutting or tearing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Packages (AREA)
- Cartons (AREA)
Abstract
Abstract of the Disclosure A resealable paperboard package has an essentially smooth inner surface coated with a moisture resistant material and is provided with outwardly biased side panel extensions located about the upper periphery of the base which intimately contact the side panels of the top to form a seal between the base and the top even when the top is replaced on the base after the package has been opened.
Description
RESEAI~ LE PAPE:R80ARD PACiCAGE
ound of the Invention This invention relates to resealable packages of the -type adapted to inhibit or prevent vapor transmission to or from the interior of the package. Packages of this type are generally used for breakfast cereals, snack foods, flour mixes, and other applications requiring low vapor transmission through the package.
Conventional packages used or these materials normally employ an outer paperboard package and an inner bag which contains the product. Once this type of package has been opened, it is very difficult, if not ;mpossible, to get a good resealing of the package to prevent the transmission of vapor into or out of the package.
The present invention on the other hand, provides a package which not only eliminates the need for a bag within the paparboard package, but also provides a means for resealing the package to inhibit the transmission of vapor into or out of the package.
Summary of the Invention The present invention comprises a resealable paperboard package which includes a base and a top. The base comprises a bottom and a plurality of base side panels extending upwardly from the bottom. The base and side panels are secured together to form the base with an open upper end. Each base side panel has a base side panel extension hingedly joined thereto along a fold line at the upper edge of the base side panel. Each base panel extension extents at an angle to the base side panel to which it is attached and is biased outwardly from the base side panel. The top comprises a top central panel and a plurality of top side panels attached to and depending from the top central panel. The top central panel and the side panels are secured together to form a top with an open lower end complimentary in shape to the open upper end ox the base.
The top is positioned over the upper end oE the base with the top side panels in intimate contact with the base panel extensions which are biased into 0ngagement with the top side panels. Initially, the top is adhesively secured to the base but is adapted to be separated from the base by breaking the adhesive bonds.
The base and the top are made from paperboard coated on one side with a commercial heat sealing vapor proof coàting. The base and the top are formed so that the interior of the package is essentially smooth and only coated surfaces of -the paperboard are exposed C)D the ;nterior of the base and the top. This keeps the product contained within the package free flowing and prevents or inhibits the migration of vapor into or out of the package. Another advantage of the present invention relates to the reinforcement of the base side walls by the top. For certain applications this will allow the package to be formed from a lower point paperboard.
Br;ef Description of the Drawings In the drawings:
PIG. 1 is an isometric view of the finished package;
PIG. 2 is an isometric view of the package showing the top and the base separated;
FIG. 3 is a plan view of the base blank;
FIG. 4 is a plan view of the top blank;
JIGS. 5-8 are schematic representations illustrating the fabrication of the base from the base blank; and FIGS. 9-13 are schematic representations of the formation of the top from the top blank with the formation occurring about the upper end of the base.
Description of the Preferred Embodiment Referring now to the drawings and in particular to JIGS. 1 and 2, reference numeral 2 designates the resealable paperboard package of the present invention. The resealable paperboard package of the present invention includes a base 4 and a top which cooperate to form the resealable package.
The base 4 is formed from blank 8 which is illustrated in FIG. 3. The blank 3 includes four base side panels 10, 12, 14 and 16, two bottom panels 18 and 22, and two bottom ~usseted tuck panels 20 and 24. The bottom panels 18, 20, 22 and 24 are hingedly joinecl to the base side panels 10, 12 14 and 16 respectively along a common horizontal score line 26 which extends along the lower edge of the base side panels. The base side panels 10, 12, 14 and 16 are hingedly joined to each other by vertical score lines 28, 30 and 32 which coincide with the vertical edges of the base side panels intermediate panels 10 and 12, 12 and 14 and 14 and 16 respectively.
The base side panels are provided with sealing extensions 34~ 36, 3~ and 40 which are hingedly joined to panels 10, l2, 14 and 16 respectively along a common horizontal score line 42 which extends along the upper edges of the base side panels. The sealing extensions 34, 36, 38 and 40 each extend the entire width ox the S base side panel to which they are joined and are separated erom each other by cuts 6 and 48. The cuts 44, ~6 and 48 are aligned with score lines 28, 30 and 32 respectively and extend completely through the pap~rboard from the free edges of the sealing extensions to the score line 42.
Base side panels 10 and 14 are each provided with a series of four spaced release spots 50 and 52 which are defined by circle cuts. The cuts extend through abo~1t half the thickness of the paperboard and adhesive 54 is applied to the surface of the release spots. The release spots 50 and 52 are spaced below the upper edges (score line 42) of the base side panels 10 and l a distance at least equal to or greater than the width of the sealing extensions 34 and 38. With this construction, the ex-tensions 34 and 38 can be folded over onto the face of the base side panels 10 and 14 without even partially covering the adhesive coated release spots 50 and 52.
A second vertical edge of base side panel 16, opposite the edge defined by the score line 32, is defined by a vertical score line 56. Score line 56 hingedly joins base side panel 16 to a side seam adhesive flap 58 which is coated on one side with an adhesive as shown in PIG. 3. The flap 58 is made up of two sections joined by scor0 line 60 and extends the entire height of panel 16. This adhesive flap 58 is adapted to be doubled over along score line 60 and the two sections bonded together. The double thickness flap is then bonded to the inner surface of panel 10 adjacent the free vertical edge of that panel to form a sleeve from the blank 8 during the package forming operation. To reduce the thickness of the doubl0d over flap 58, the thickness of the paperboard in the flap may be reduced by skiving or shaving one surface Oe the paperboard prior to applying the adhesive.
us shown in FIG. 3, outer bottom panel 18 has a length corresponding to the width of base side pane]. 10 and a width corresponding to the width of base side panel -L2 and 16. The outer bottom panel 18 is joined to the inner bottom panel 22 by bottom t~7~
tuck panel 20. Tuck panel 20 is hingedly joined to the outer bottom panel 18 and the inner bottom panel 22 along score lines 28 and 30 respectively. The tuck panel 20 compr;ses three generally triangular shaped sections 62, 64 and 66 which are defined by score 5 lines 26, 28, 30, 68 and 70. Score lines 68 and 70 hingedly join sections 62, 6~ and 66. The score lines 68 and 70 start at the intersections of score line 26 and score lines 28 and 30 respectively; are oriented at an angle of 90 with respect to each other and 45~ with respect to score lines 28 and 30; and end at the free edge of tuck panel 20 where they intersect. Except for a bottom sealing extension 72 which extends the width of the ;nner bottom panel 22, the tuck panel 20 has a width about half that of the inner bottom panel 22.
Tuck panel 24 is a mirror image of tuck panel 20 and is hingedly joined to the inner base panel 22 along score line 32. The tuck panel 24 comprises three generally triangular shaped sections 7~, 76 and 78 ~Jhich are defined by score lines 26, 32, 56, 80 and 82. Fold lines 80 and 82 hingedly join sections 74, 76 and 78. The score lines 80 and 82 start at the intersections of score line 26 and score lines 32 and 56 respectively; are oriented at an angle of 90~ with respect to each other and 45 with respect to score lines 32 and 56; and end at the free edge of tuck panel 24 where they intersect. except for a bottom sealing extension 84 which extends the width of inner bottom panel 22, the tuck panel ?4 has a width about half that of the inner bottom panel.
sealing and adhesive extension 86 is hingedly joined to tuck panel 24 along score line 56 and side seam adhesive flap 58 along score line 26. The sealing and adhesive extension 86 is the same width as tuck panel 24.
Inner bottom panel 22 is defined by score line 26, a score line 88, opposite score line 26 and extending parallel to score line 26, plus score lines 30 and 32 which hingedly join the inner bottom panel 22 to tuck panels 20 and 24 respectively. The extensions of score lines 30 and 32 which join the inner bottom panel 22 to tuck panels 20 and 24 are offset slightly from the main portions of the score lines so that the inner bottom panel. 22 has a length substantially corresponding to but somewhat less the width of base side panel l The width ox the bottom panel 22 corresponds to the width of base side panels 12 and 16. Score line 88 hingedly joins the inner bottom panel to sealing flap 90 which extends the entire length of the inner bottom panel. This flap in conjunction with sealing extensions located on the adjacent tuck panels 20 and 2~ are utilized to seal the bottom of the base I.
As shown in FIG. 3, one side of panels 20, 22, 2~l and extension 86 are coated with a heat sealing adhesive for bonding the base of the package together.
As illustrated in FIG. 4, the top 6 is formed from a blank 100 which includes a top central panel 102 and top side panels 10~l, 106, 108 and 110. Side panels 10~l and 106 are located on opposite sides of the top central panel 102 and are hingedly joined to the top central panel by score lines 112 and 114. The top side panels 104 and 106 have a horizontal dimension equal to the dimension of the top central panel edge to which they are joined and a vertical dimension equal to the vertical dimension of the top side panels 108 and 110. The top side panels 108 and 110 are located on opposite sides of the top central panel 102 and are hingedly joined to the top central panel by score lines 116 and 118 respectively. The top side panels 108 and 110 have a horizontal dimension equal to the horizontal dimension of the top central panel edge to which they are joined and a vertical dimension equal to or less than the vertical dimension between the tops of release spots 50, 52 and the upper edges (score line ~2) of base side panels 10 and is Top side panels 108 and 110 have release panels 120 and 122 depending therefrom and hingedly joined thereto along score lines 12~ and 126 respectively. The horizontal dimensions of the panels 120 and 122 equal the dimension of the top side panel edge to which they are joined. The vertical dimension of the release panels 120 and 122 is such that the vertical dimension from the lower free 0dges 128, 130 of the release panels to score lines 116 and 118 raspectively is equal to or greater than the vertical dimension from the bottoms of release spots 50, 52 to the upper edges (score line ~2) of the base side panels 10 and l Inner ~lu0 flaps 132 and 13~ are hingedly joined to the ends of top side panel 108 along score lines 112 and 11~
_~_ Pi resp0ctively. Outer glue flaps 136 and 138 are hingedly joined to the ends of top sida panel llO along score lines 112 and 114 respectively. The horlzontal and vertical dimensions of the glue flaps 132, 134, 136 and 138 equal the horizontal and vertical dimensions of top side panels 104 and 106. The glue flaps are separated from the top side panels by cuts 140, 142, 144 and 146.
As shown in FIG. 4, one side of pane].s 104 and 106 and one side of inner glue flaps 132 and 134 are coated with a heat sealing adhesive. With this construction the elue flaps are adapted to be folded over and adhesively bonded to each other and the top side panels 104 and 106 when the top 6 is formed.
Although not shown in FIGS. 3 and 4, the opposite sides of blanks 8 and 100 are entirely coated with a heat sealing metal.liæed one side low density polyethylene film. The metalli~ed side is laminated to the paperboard. The film functions as a moisture or vapor barrier and as an adhesive during the formation of the package.
The grain of the paperboard in the base blank 8 extends parallel to score lines 26 and 42. The grain of the paperboard in the top blank 100 extends parallel to score lines 116 and llS. With the grains running in these directions the extensions 34, 36, 38 and 40 and the panels 103 and 110 tend to remain flat. With the grains running perpendicular to the preferred direction the extensions 34, 36, 38 and 40 can tend to become wavy thereby adversely affecting the seal between the top 6 and the base 4.
The package 2 is formed by first forming the base 4 by folding and sealing it about a mandrel (not shown having an exterior shape complimentary to the interior shape of the base, filling the base with the material being packaged, forming the top 6 on the base and sealing the top to the base.
The first step in the formation of the base 4 is to fold the outer section of glue flap 58 over onto the inner section to place the adhesive coated surfaces in contact. The sections of the adhesive Elap 58 are then adhesively bonded together. This results in an adhesive flap 58 wherein both of its exposed surfaces are coated with the polyethylene film.
The base blank 8 is then folded along score lines 12, 30, 32 and 56 to form a sleeve with the inner polyethylene coated t7 surface of base side pnnel 10 adjacent its free edge overlapping the polythylene coated adhesiYe flap 58. The side seam adhesive flap 58 is then adhesively bonded to the inner surface of the base side panel 10 to form the sleeve shown in FIG. 5. The side seam ox the sleeve has no raw edges to permit moisture migration and the adhesive bond between the polyethylene coated surfaces forms a Good seal. The sealing extensions 34, 36, 38 and ~0 are folded back along score line ~2 toward their adjacent base side panels. However, because of the memory of the paperboard> the extensions are biased outwardly from the base sid0 walls and do not l;e flat against the sidewalls.
After the sleeve is formed the inner base panel 22 is folded along score line 26 to the position shown in FIG. 6 to close the bottom of the base and bring the polyethylene coated surface of the adhesive flap 90 into contact with the inner polyethylene coated surface of outer bottom panel 18 Concurrently the panel sections 66 and 74 wi-th their extensions 72 and 8~ are being folded back along score lines 70, 30 and 80, 32 to bring the polyethylene coated surfaces of these sections into contact with the polyethylene coated surfaces of panels 62, 64 and 76, 78. As shown in FIG. 7, the outer bottom panel l and the sections 62, 64 and 76, 78 of tuck panels 20 and 2~ are now folded to overlay the inner bottom panel 22. The panel sections 62, 64 are folded along score lines 26, 28 and 68 and the panel sections 76, 78 are folded along score lines 32, 56 and 82. Once folded, the tuck panels 20 and 2~l are disposed intermediate the outer bottom panel 18 and the inner bottom panel 22. The outer bottom panel 18 which overlays both the inner bottom panel 22 and the tuck panels is folded along fold line 13 up against the inner bottom panel and causes the sealing flap 90 to be folded back against the inner bottom panel. Once the bottom pan01s are folded to form the base as shown in FIG. 8, the panels are adhesively bonded together by apply;ng pressure and heat to the adhesive on the panels. With this bottom construction the edges of the inner bottom pan01 exposed to the interior of the package are all defined bythe polythylene coated sides of score lines 26, 30, 32 and 88. accordingly, the inner bottom panel pres0nts no raw edges which would allow moisture migration and the bond between the polycthylene coated surfaces forms a Good seal.
After the base 4 is fotmed it is filled with the material to be packaged and then used as a mandrel for forming the top 6.
The material to be packaged is omitted from FIG. 9 for clarity.
S As shown in FIGS. 9 and 10 the top b].ank lOO is positioned over the base 4. The top side panel 108 is then folded about scoreline 116 to overlay sealing extension 34 and top side panels 104 and 106 are folded about score lines 112 and 114 to overlay sealing extensions 36 and 40. Top side panel 110 is then folded about score line 118 to overlay sealing extension 38 as shown in FIG. 11. Next glue flaps 13Z and 134 are folded about score lines 112 and 114 to overlay and to be adhesively bonded to top side panels 104 and lO6 as shown in E'IG. 12. The glue flaps .L36 and 138 are then folded about score lines 11~ and 114 to overlay and to be adhesively bonded to glue flaps 132 and 13~s. The release panels 120 and 122 are adhesively bonded to the base side panels 10 and 14 by means of the adhesive spots 50 and 52 respectively to form the package illustrated in FIG. 13 with the polyethylene coated surfaces of the top 6 in contact with the polyethylene coated surPaces of the sealing extensions 34, 36, 38 and 40.
While a preferred method of forming the package has been described, it is contemplated that other methods could also be employed. For example the top 6 and the base 4 could each be Formed about separate mandrels and then the top 6, already formed, placad over and adhesively bonded to the base 4.
_~_
ound of the Invention This invention relates to resealable packages of the -type adapted to inhibit or prevent vapor transmission to or from the interior of the package. Packages of this type are generally used for breakfast cereals, snack foods, flour mixes, and other applications requiring low vapor transmission through the package.
Conventional packages used or these materials normally employ an outer paperboard package and an inner bag which contains the product. Once this type of package has been opened, it is very difficult, if not ;mpossible, to get a good resealing of the package to prevent the transmission of vapor into or out of the package.
The present invention on the other hand, provides a package which not only eliminates the need for a bag within the paparboard package, but also provides a means for resealing the package to inhibit the transmission of vapor into or out of the package.
Summary of the Invention The present invention comprises a resealable paperboard package which includes a base and a top. The base comprises a bottom and a plurality of base side panels extending upwardly from the bottom. The base and side panels are secured together to form the base with an open upper end. Each base side panel has a base side panel extension hingedly joined thereto along a fold line at the upper edge of the base side panel. Each base panel extension extents at an angle to the base side panel to which it is attached and is biased outwardly from the base side panel. The top comprises a top central panel and a plurality of top side panels attached to and depending from the top central panel. The top central panel and the side panels are secured together to form a top with an open lower end complimentary in shape to the open upper end ox the base.
The top is positioned over the upper end oE the base with the top side panels in intimate contact with the base panel extensions which are biased into 0ngagement with the top side panels. Initially, the top is adhesively secured to the base but is adapted to be separated from the base by breaking the adhesive bonds.
The base and the top are made from paperboard coated on one side with a commercial heat sealing vapor proof coàting. The base and the top are formed so that the interior of the package is essentially smooth and only coated surfaces of -the paperboard are exposed C)D the ;nterior of the base and the top. This keeps the product contained within the package free flowing and prevents or inhibits the migration of vapor into or out of the package. Another advantage of the present invention relates to the reinforcement of the base side walls by the top. For certain applications this will allow the package to be formed from a lower point paperboard.
Br;ef Description of the Drawings In the drawings:
PIG. 1 is an isometric view of the finished package;
PIG. 2 is an isometric view of the package showing the top and the base separated;
FIG. 3 is a plan view of the base blank;
FIG. 4 is a plan view of the top blank;
JIGS. 5-8 are schematic representations illustrating the fabrication of the base from the base blank; and FIGS. 9-13 are schematic representations of the formation of the top from the top blank with the formation occurring about the upper end of the base.
Description of the Preferred Embodiment Referring now to the drawings and in particular to JIGS. 1 and 2, reference numeral 2 designates the resealable paperboard package of the present invention. The resealable paperboard package of the present invention includes a base 4 and a top which cooperate to form the resealable package.
The base 4 is formed from blank 8 which is illustrated in FIG. 3. The blank 3 includes four base side panels 10, 12, 14 and 16, two bottom panels 18 and 22, and two bottom ~usseted tuck panels 20 and 24. The bottom panels 18, 20, 22 and 24 are hingedly joinecl to the base side panels 10, 12 14 and 16 respectively along a common horizontal score line 26 which extends along the lower edge of the base side panels. The base side panels 10, 12, 14 and 16 are hingedly joined to each other by vertical score lines 28, 30 and 32 which coincide with the vertical edges of the base side panels intermediate panels 10 and 12, 12 and 14 and 14 and 16 respectively.
The base side panels are provided with sealing extensions 34~ 36, 3~ and 40 which are hingedly joined to panels 10, l2, 14 and 16 respectively along a common horizontal score line 42 which extends along the upper edges of the base side panels. The sealing extensions 34, 36, 38 and 40 each extend the entire width ox the S base side panel to which they are joined and are separated erom each other by cuts 6 and 48. The cuts 44, ~6 and 48 are aligned with score lines 28, 30 and 32 respectively and extend completely through the pap~rboard from the free edges of the sealing extensions to the score line 42.
Base side panels 10 and 14 are each provided with a series of four spaced release spots 50 and 52 which are defined by circle cuts. The cuts extend through abo~1t half the thickness of the paperboard and adhesive 54 is applied to the surface of the release spots. The release spots 50 and 52 are spaced below the upper edges (score line 42) of the base side panels 10 and l a distance at least equal to or greater than the width of the sealing extensions 34 and 38. With this construction, the ex-tensions 34 and 38 can be folded over onto the face of the base side panels 10 and 14 without even partially covering the adhesive coated release spots 50 and 52.
A second vertical edge of base side panel 16, opposite the edge defined by the score line 32, is defined by a vertical score line 56. Score line 56 hingedly joins base side panel 16 to a side seam adhesive flap 58 which is coated on one side with an adhesive as shown in PIG. 3. The flap 58 is made up of two sections joined by scor0 line 60 and extends the entire height of panel 16. This adhesive flap 58 is adapted to be doubled over along score line 60 and the two sections bonded together. The double thickness flap is then bonded to the inner surface of panel 10 adjacent the free vertical edge of that panel to form a sleeve from the blank 8 during the package forming operation. To reduce the thickness of the doubl0d over flap 58, the thickness of the paperboard in the flap may be reduced by skiving or shaving one surface Oe the paperboard prior to applying the adhesive.
us shown in FIG. 3, outer bottom panel 18 has a length corresponding to the width of base side pane]. 10 and a width corresponding to the width of base side panel -L2 and 16. The outer bottom panel 18 is joined to the inner bottom panel 22 by bottom t~7~
tuck panel 20. Tuck panel 20 is hingedly joined to the outer bottom panel 18 and the inner bottom panel 22 along score lines 28 and 30 respectively. The tuck panel 20 compr;ses three generally triangular shaped sections 62, 64 and 66 which are defined by score 5 lines 26, 28, 30, 68 and 70. Score lines 68 and 70 hingedly join sections 62, 6~ and 66. The score lines 68 and 70 start at the intersections of score line 26 and score lines 28 and 30 respectively; are oriented at an angle of 90 with respect to each other and 45~ with respect to score lines 28 and 30; and end at the free edge of tuck panel 20 where they intersect. Except for a bottom sealing extension 72 which extends the width of the ;nner bottom panel 22, the tuck panel 20 has a width about half that of the inner bottom panel 22.
Tuck panel 24 is a mirror image of tuck panel 20 and is hingedly joined to the inner base panel 22 along score line 32. The tuck panel 24 comprises three generally triangular shaped sections 7~, 76 and 78 ~Jhich are defined by score lines 26, 32, 56, 80 and 82. Fold lines 80 and 82 hingedly join sections 74, 76 and 78. The score lines 80 and 82 start at the intersections of score line 26 and score lines 32 and 56 respectively; are oriented at an angle of 90~ with respect to each other and 45 with respect to score lines 32 and 56; and end at the free edge of tuck panel 24 where they intersect. except for a bottom sealing extension 84 which extends the width of inner bottom panel 22, the tuck panel ?4 has a width about half that of the inner bottom panel.
sealing and adhesive extension 86 is hingedly joined to tuck panel 24 along score line 56 and side seam adhesive flap 58 along score line 26. The sealing and adhesive extension 86 is the same width as tuck panel 24.
Inner bottom panel 22 is defined by score line 26, a score line 88, opposite score line 26 and extending parallel to score line 26, plus score lines 30 and 32 which hingedly join the inner bottom panel 22 to tuck panels 20 and 24 respectively. The extensions of score lines 30 and 32 which join the inner bottom panel 22 to tuck panels 20 and 24 are offset slightly from the main portions of the score lines so that the inner bottom panel. 22 has a length substantially corresponding to but somewhat less the width of base side panel l The width ox the bottom panel 22 corresponds to the width of base side panels 12 and 16. Score line 88 hingedly joins the inner bottom panel to sealing flap 90 which extends the entire length of the inner bottom panel. This flap in conjunction with sealing extensions located on the adjacent tuck panels 20 and 2~ are utilized to seal the bottom of the base I.
As shown in FIG. 3, one side of panels 20, 22, 2~l and extension 86 are coated with a heat sealing adhesive for bonding the base of the package together.
As illustrated in FIG. 4, the top 6 is formed from a blank 100 which includes a top central panel 102 and top side panels 10~l, 106, 108 and 110. Side panels 10~l and 106 are located on opposite sides of the top central panel 102 and are hingedly joined to the top central panel by score lines 112 and 114. The top side panels 104 and 106 have a horizontal dimension equal to the dimension of the top central panel edge to which they are joined and a vertical dimension equal to the vertical dimension of the top side panels 108 and 110. The top side panels 108 and 110 are located on opposite sides of the top central panel 102 and are hingedly joined to the top central panel by score lines 116 and 118 respectively. The top side panels 108 and 110 have a horizontal dimension equal to the horizontal dimension of the top central panel edge to which they are joined and a vertical dimension equal to or less than the vertical dimension between the tops of release spots 50, 52 and the upper edges (score line ~2) of base side panels 10 and is Top side panels 108 and 110 have release panels 120 and 122 depending therefrom and hingedly joined thereto along score lines 12~ and 126 respectively. The horizontal dimensions of the panels 120 and 122 equal the dimension of the top side panel edge to which they are joined. The vertical dimension of the release panels 120 and 122 is such that the vertical dimension from the lower free 0dges 128, 130 of the release panels to score lines 116 and 118 raspectively is equal to or greater than the vertical dimension from the bottoms of release spots 50, 52 to the upper edges (score line ~2) of the base side panels 10 and l Inner ~lu0 flaps 132 and 13~ are hingedly joined to the ends of top side panel 108 along score lines 112 and 11~
_~_ Pi resp0ctively. Outer glue flaps 136 and 138 are hingedly joined to the ends of top sida panel llO along score lines 112 and 114 respectively. The horlzontal and vertical dimensions of the glue flaps 132, 134, 136 and 138 equal the horizontal and vertical dimensions of top side panels 104 and 106. The glue flaps are separated from the top side panels by cuts 140, 142, 144 and 146.
As shown in FIG. 4, one side of pane].s 104 and 106 and one side of inner glue flaps 132 and 134 are coated with a heat sealing adhesive. With this construction the elue flaps are adapted to be folded over and adhesively bonded to each other and the top side panels 104 and 106 when the top 6 is formed.
Although not shown in FIGS. 3 and 4, the opposite sides of blanks 8 and 100 are entirely coated with a heat sealing metal.liæed one side low density polyethylene film. The metalli~ed side is laminated to the paperboard. The film functions as a moisture or vapor barrier and as an adhesive during the formation of the package.
The grain of the paperboard in the base blank 8 extends parallel to score lines 26 and 42. The grain of the paperboard in the top blank 100 extends parallel to score lines 116 and llS. With the grains running in these directions the extensions 34, 36, 38 and 40 and the panels 103 and 110 tend to remain flat. With the grains running perpendicular to the preferred direction the extensions 34, 36, 38 and 40 can tend to become wavy thereby adversely affecting the seal between the top 6 and the base 4.
The package 2 is formed by first forming the base 4 by folding and sealing it about a mandrel (not shown having an exterior shape complimentary to the interior shape of the base, filling the base with the material being packaged, forming the top 6 on the base and sealing the top to the base.
The first step in the formation of the base 4 is to fold the outer section of glue flap 58 over onto the inner section to place the adhesive coated surfaces in contact. The sections of the adhesive Elap 58 are then adhesively bonded together. This results in an adhesive flap 58 wherein both of its exposed surfaces are coated with the polyethylene film.
The base blank 8 is then folded along score lines 12, 30, 32 and 56 to form a sleeve with the inner polyethylene coated t7 surface of base side pnnel 10 adjacent its free edge overlapping the polythylene coated adhesiYe flap 58. The side seam adhesive flap 58 is then adhesively bonded to the inner surface of the base side panel 10 to form the sleeve shown in FIG. 5. The side seam ox the sleeve has no raw edges to permit moisture migration and the adhesive bond between the polyethylene coated surfaces forms a Good seal. The sealing extensions 34, 36, 38 and ~0 are folded back along score line ~2 toward their adjacent base side panels. However, because of the memory of the paperboard> the extensions are biased outwardly from the base sid0 walls and do not l;e flat against the sidewalls.
After the sleeve is formed the inner base panel 22 is folded along score line 26 to the position shown in FIG. 6 to close the bottom of the base and bring the polyethylene coated surface of the adhesive flap 90 into contact with the inner polyethylene coated surface of outer bottom panel 18 Concurrently the panel sections 66 and 74 wi-th their extensions 72 and 8~ are being folded back along score lines 70, 30 and 80, 32 to bring the polyethylene coated surfaces of these sections into contact with the polyethylene coated surfaces of panels 62, 64 and 76, 78. As shown in FIG. 7, the outer bottom panel l and the sections 62, 64 and 76, 78 of tuck panels 20 and 2~ are now folded to overlay the inner bottom panel 22. The panel sections 62, 64 are folded along score lines 26, 28 and 68 and the panel sections 76, 78 are folded along score lines 32, 56 and 82. Once folded, the tuck panels 20 and 2~l are disposed intermediate the outer bottom panel 18 and the inner bottom panel 22. The outer bottom panel 18 which overlays both the inner bottom panel 22 and the tuck panels is folded along fold line 13 up against the inner bottom panel and causes the sealing flap 90 to be folded back against the inner bottom panel. Once the bottom pan01s are folded to form the base as shown in FIG. 8, the panels are adhesively bonded together by apply;ng pressure and heat to the adhesive on the panels. With this bottom construction the edges of the inner bottom pan01 exposed to the interior of the package are all defined bythe polythylene coated sides of score lines 26, 30, 32 and 88. accordingly, the inner bottom panel pres0nts no raw edges which would allow moisture migration and the bond between the polycthylene coated surfaces forms a Good seal.
After the base 4 is fotmed it is filled with the material to be packaged and then used as a mandrel for forming the top 6.
The material to be packaged is omitted from FIG. 9 for clarity.
S As shown in FIGS. 9 and 10 the top b].ank lOO is positioned over the base 4. The top side panel 108 is then folded about scoreline 116 to overlay sealing extension 34 and top side panels 104 and 106 are folded about score lines 112 and 114 to overlay sealing extensions 36 and 40. Top side panel 110 is then folded about score line 118 to overlay sealing extension 38 as shown in FIG. 11. Next glue flaps 13Z and 134 are folded about score lines 112 and 114 to overlay and to be adhesively bonded to top side panels 104 and lO6 as shown in E'IG. 12. The glue flaps .L36 and 138 are then folded about score lines 11~ and 114 to overlay and to be adhesively bonded to glue flaps 132 and 13~s. The release panels 120 and 122 are adhesively bonded to the base side panels 10 and 14 by means of the adhesive spots 50 and 52 respectively to form the package illustrated in FIG. 13 with the polyethylene coated surfaces of the top 6 in contact with the polyethylene coated surPaces of the sealing extensions 34, 36, 38 and 40.
While a preferred method of forming the package has been described, it is contemplated that other methods could also be employed. For example the top 6 and the base 4 could each be Formed about separate mandrels and then the top 6, already formed, placad over and adhesively bonded to the base 4.
_~_
Claims (3)
1. A vapor proof, resealable paperboard package comprising:
a base including a bottom and a plurality of base side panels extending upwardly from the bottom and defining an open upper end, each base side panel hazing a base side panel extension hingedly attached thereto along a fold line at the upper end of the base side panel, each base side panel extension being folded back along its fold line away from said open upper end, the memory of the paperboard biasing each said extension outwardly from the base side panel to which it is attached;
a top including a top central panel and a plurality of top side panels attached to and depending from the top central panel, said top central panel and said top side panels being secured together to form said top with an open lower end complementary to the open top end of the base;
said paperboard base and top being coated with a heat sealable moisture resistant coating on all surfaces thereof;
said top being positioned over, and peripherally surrounding, the upper end of the base, the coating on the top side panels having been heat sealed to the coating on the folded-back base panel extensions;
said sealed coating adapted to be broken to permit the top to be lifted from the package, the coating on the top wide panels firmly engaging the coating on the outwardly biased folded-back base panel extensions when the top is repositioned on tile base to provide a substantially vapor proof seal.
a base including a bottom and a plurality of base side panels extending upwardly from the bottom and defining an open upper end, each base side panel hazing a base side panel extension hingedly attached thereto along a fold line at the upper end of the base side panel, each base side panel extension being folded back along its fold line away from said open upper end, the memory of the paperboard biasing each said extension outwardly from the base side panel to which it is attached;
a top including a top central panel and a plurality of top side panels attached to and depending from the top central panel, said top central panel and said top side panels being secured together to form said top with an open lower end complementary to the open top end of the base;
said paperboard base and top being coated with a heat sealable moisture resistant coating on all surfaces thereof;
said top being positioned over, and peripherally surrounding, the upper end of the base, the coating on the top side panels having been heat sealed to the coating on the folded-back base panel extensions;
said sealed coating adapted to be broken to permit the top to be lifted from the package, the coating on the top wide panels firmly engaging the coating on the outwardly biased folded-back base panel extensions when the top is repositioned on tile base to provide a substantially vapor proof seal.
2. The package of claim 1 wherein said coating includes polyethylene.
3. The package of claim 1 wherein the top side panels include release panels hingedly connected thereto and extending downwardly therefrom to facilitate the removal of the sealed top.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US57139784A | 1984-01-17 | 1984-01-17 | |
| US06/571,397 | 1984-01-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1242174A true CA1242174A (en) | 1988-09-20 |
Family
ID=24283545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000472035A Expired CA1242174A (en) | 1984-01-17 | 1985-01-14 | Resealable paperboard package |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1242174A (en) |
| GB (1) | GB2189464B (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH582605A5 (en) * | 1973-10-26 | 1976-12-15 | Elopak As | |
| GB1568508A (en) * | 1976-12-20 | 1980-05-29 | Redmond & Sons Ltd P | Packing case |
-
1985
- 1985-01-14 CA CA000472035A patent/CA1242174A/en not_active Expired
-
1986
- 1986-04-21 GB GB8609648A patent/GB2189464B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2189464A (en) | 1987-10-28 |
| GB8609648D0 (en) | 1986-05-29 |
| GB2189464B (en) | 1989-11-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |