Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
  • B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
• • 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
  • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
  • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
• • 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
  • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
  • B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
• • 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
  • B65D33/00—Details of, or accessories for, sacks or bags
  • B65D33/02—Local reinforcements or stiffening inserts, e.g. wires, strings, strips or frames
• • 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
  • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
  • B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
  • B65D85/36—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for bakery products, e.g. biscuits

Definitions

• the present invention relates generally to flexible bags designed to hold food products such as bread.
• a plastic bag by folding a continuous sheet of a flexible material such as thermoplastic, over on Itself, then making an in-fold at the folded edge, to form a gusset, and then simultaneously cutting and heat sealing the folded sheet along spaced apart transverse lines that are perpendicular to the fold.
• Each individual bag formed in this manner has an "W shaped cross section at the gusset.
• This type of bag is commonly referred to as a "bread bag” and is often used for packaging loaves of bread.
• the bread loaf Is inserted into the bag through an open end that is opposite the gusset. The open end is then tied shut in an appropriate manner to often present what is called the "pony-tail" end of the bag.
• the present invention is direcied to a double-bottom bag comprising an outer web and an inner web having an open mouth and an opposing bottom, where the outer web has a first side edge, an opposing second side and is folded upon itself thereby defining a front panel having a !ength and a back panel having a Iength,
• the outer web further includes an inward-facing cross-sectional gusset opposite the open mouth of the bag and centered along the width of the bag which joins the front pane! to the back panel and forms an outer bottom portion of the bag.
• the inner web has a first side edge, an opposing second side and is folded upon itself thereby defining a front panel having a Iength which is less than the Iength of the front panel of the outer web and a back panel having Iength which is less than the Iength of the back pane! of the outer web.
• the inner web further includes an inward-facing cross-sectional gusset opposite the open mouth of the bag and centered along the width of the bag which joins the front panel to the back pane! and forms an inner bottom portion of the bag.
• the bag further comprises a first side-seam affixing the first side edge of both the inner and outer webs together and affixing the front and back panels of the outer web together along the first side edge.
• the bag still further includes an opposing second side- seam affixing the opposing second side edge of both the inner and outer webs together and affixing the front and back panels of the outer web together along the second side edge.
• the bag of the present invention is designed such that the inward-facing cross-sectional gussets of both the inner and outer webs expand to form a square cross-sectional portion upon receiving a material to be packaged.
• One advantage of the present invention provides is a separate surface of an inner web where moisture from the bread or other bakery products may condense without affecting the appearance of product identifying information printed on an outer web of the bag.
• the present invention also provides the convenience of a square or rectangular bottom gusset cross sectionai area where product information can be printed and viewed by the consumer, BRIEF DESCRIPTION OF THE DRAWINGS
• FIG, 1 illustrates a schematic view of one embodiment of a double-bottom bag according to the present invention.
• FIG. 2 illustrates an exploded view taken along line A-A of FIG. 1 depicting a double-bottom bag in a horizontal position.
• FIG. 3 illustrates an exploded view taken along line A ⁇ A of FIG. 1 depicting a double-bottom bag in a vertical position
• FIG. 4 illustrates a transverse cross-sectional view of one embodiment of an outer web.
• FIG. 5 illustrates a transverse cross-sectional view of one embodiment of an inner web.
• FIGS. 1-3 a representative double- bottom bag as described herein is shown in FIGS. 1-3.
• Bag 10 of the present invention comprises an open mouth 11 and an opposing bottom 12.
• bag 10 further includes an outer web 20 (represented as a solid Sine) having a first side edge 21 and an opposing second side edge, 22 : a front panel 23 and a back panel 25.
• Bag 10 aiso includes an inner web 30 ⁇ represented as a dotted line) having a first side edge 31 and an opposing second side edge, 32, a front panel 33 and a back panel 35.
• Outer and inner webs each include an inward-facing cross-sectional gusset, 27 and 37, respectively, opposite the open mouth 11 and centered along the width of the bag.
• gussets 27 and 27 join the front panels, 23 and 33 to the back panels, 25 and 35, respectively, inward-facing cross-sectional gusset 27 of outer web 20 forms an outer boitom portion 28 of bag 10 while inward-facing cross-sectional gusset 37 of inner web 30 forms an inner bottom portion 38 of bag 10.
• bag 10 further comprises a first side-seam 41 affixing first side edges 21 and 31 together, and affixing the front and back panels, 23 and 25 of the outer web 20 together along the first side edge 31.
• Bag 10 also includes opposing second side-seam 42 affixing second side edges 22 and 32 together, and affixing the front and back panels, 23 and 25 of the outer web 20 together along the opposing second side edge 32.
• First and second side-seams, 41 and 42 will generally extend the entire length of front and back panels 23 and 25 of the outer web 20, Side- seams 41 and 42 may be formed by application of an adhesive which may include, but not limited to cold-seal adhesives, pressure sensitive adhesive and the like, or by heat sealing.
• side seams 41 and 42 are each heat seals formed by application of heat and pressure to outer and inner webs 20 and 30.
• the inward facing cross-sectional gussets 27 and 37 are each adapted to expand to form a square or rectangular cross-sectional bag bottom upon receiving a material to be packaged.
• a material may include, but is not limited to bakery products, such as bread loaves, hot dog and hamburger buns and the like. Non-food products may also be packed in the bags of the present invention.
• the front panel 33 of inner web 30 has a length which is less than the length of the front panel 23 of outer web 20, Front panel 33 may have a length which is about 75%, 70%, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10% or 5% of the length of front pane! 23 of outer web 20.
• front panel 33 of Inner web 30 has a length which is less than 50%, more preferably, less than 25% and most preferably, about 15%, 10% or 5% of the length of front panel 23 of outer web 20.
• the back panel 35 of inner web 30 has a length which is less than the length of the back pane!
• Back panei 35 may have a Iength which is about 75%, 70%, 85%, 60%, 55%, 50%, 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10% or 5% of the Iength of front panel 25 of outer web 20.
• back panel 35 of inner web 30 has a length which is iess than 50%, more preferably, less than 25% and most preferably, about 15%, 10% or 5% of the Iength of back panel 25 of outer web 20. It is also contemplated that a substantia! portion of each front panels 23 and 33 face each other and are unSaminated together, and a substantial portion of each back panels 25 and 35 face each other and are unlaminated together.
• the back pane! 25 of outer web 20 may have a iength which is greater than the length of the front panel 23 of outer web 20.
• Back panel 25 may have a Iength which is 5%, 10%, 15%, 20% greater than the Iength of front panel 23 of outer web 20.
• a lip is formed which provides an area for one or more apertures, perforations or holes, 43 located near the open mouth 11.
• Bags constructed with one or more apertures aids in handling and packaging of products in such a way that multiple bags can be placed on a wire "wicket" for ease of dispensing.
• outer web 20 is formed from a heat-fusible material.
• outer web 20 is fabricated from a polyolefin thermoplastic material, which ma include, but not limited to polyethylene homopoSymer and copolymers, polyethylene blends, polypropylene homopolymer and copolymers, and blends of polyethylene and other thermoplastic materials.
• outer web 20 comprises a blend of low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), a blend of 10% by weight of low density polyethylene (LDPE) and 90% by weight of linear low density polyethylene (LLDPE), a blend of 40% by weight of low density polyethylene (LDPE) and 60% by weight of linear low density polyethylene (LLDPE), or a blend of 60% by weight of low density polyethylene (LDPE) and 40% by weight of linear low density polyethylene (LLDPE),
• Outer web 20 may comprise a monolayer or multilayer structure. Referring now the FIG, 5, outer web 20 may comprise a three ply structure 200 having an interior layer 202 sandwiched between two exterior layers 201 and 203.
• layers 201, 20 and 203 each comprise polyethylene.
• interior layer 202 comprises a blend of about 50% by weight polyethylene and about 50% by weight polypropylene copolymer, and exterior layers 201 and 203 each comprise polyethylene.
• outer web 20 has a thickness of between 18 and 50 microns (0,71 -2.0 mil).
• inner web 30 may be formed from the same material as outer web 20 or a different material.
• inner web 30 is formed from a heat-fusible material.
• inner web 30 is embossed and formed from a flexible thermoplastic film which is substantially opaque.
• inner web 30 is fabricated from a poSyolefin thermoplastic material, which may include, but not limited to polyethylene homopoSymer and copolymers, polyethylene blends, polypropylene homopoSymer and copolymers, and blends of polyethylene and other thermoplastic materials.
• Inner web 30 may comprise a monolayer or multilayer structure. Referring now the FiG.
• outer web 20 may comprise a three ply structure 300 having an interior layer 302 sandwiched between two exterior layers 301 and 303
• layers 301, 302 and 303 each comprise polyethylene.
• inner web 30 has a thickness of between 9 and 50 microns (0,35 and 2.0 mil), preferably, between 20 and 30 microns (0.8-1.2 mil).
• the outer web 20 structures were produced using a blown film coextrusion apparatus and methods which are well known to those skilled in the art.
• the inner web 30 structures were produced using cast coextrusion film apparatus and methods which are well known to those skilled in the art.
• Inner web 30 was embossed by pressing and simultaneously cooling a meit-plastified film against an engraving cylinder.
• Example 1 is one embodiment of an outer web 20 as illustrated in FIG. 3, and one embodiment of an inner web 30 as illustrated in FiG. 4 each having a structure and layer compositions as described below:
• Layer 201 is a blend of 43% by weight of low density polyethylene (LDPE) having density of 0,922 g/cm 3 , 54% by weight of linear low density polyethylene (LLDPE) having density of 0,918 g/cm 3 and about 3% by weight of processing additives.
• LDPE low density polyethylene
• LLDPE linear low density polyethylene
• Exemplary of a commercially available LDPE is ExxonMobilTM LDPE LD 123.LN supplied by Exxon Mobil Chemical Company (Houston, TX, USA).
• Exemplary of a commercially available LLDPE is ExxonMobilTM LLDPE LL 1002YB supplied by Exxon Mobil Chemical Company (Houston, TX, USA).
• Layer 202 is a blend of 60% by weight of linear low density polyethylene (LLDPE) having density of 0,919 g/cm 3 , 10% by weight of polyethylene regrind, 27.5% by weight of tow density polyethylene (LDPE) having density of 0.922 g/cm 4 ; and about 2.5% by weight processing additives.
• LLDPE linear low density polyethylene
• LDPE tow density polyethylene
• Exemplary of a commercially available LLDPE is DOWLEXTM TG 2085B supplied by Dow Chemical Company (Midland, Ml, USA).
• Layer 203 has the same composition as Layer 201.
• Layer 301 is a blend of 29.5% by weight of linear low density polyethylene (LLDPE) having a density of 0.941 g/cm 3 , 25% by weight of high density polyethylene (HOPE) having a density of 0.98 g/cm 3 , 23% by weight of low density polyethylene (LDPE) having density of 0,918 g/cm 3 , 21 % by weight of linear Sow density polyethylene (LLDPE) having a density of 0.918 g/cm 3 , and about 1 ,5% by weight processing additives.
• LLDPE linear low density polyethylene
• HOPE high density polyethylene
• LDPE low density polyethylene
• LLDPE low density polyethylene
• LLDPE linear Sow density polyethylene
• Exemplary of a commercially available LLDPE having a density of 0.941 g/cm 3 is ExxonMobilTM LLDPE LL 3404,48 supplied by Exxon Mobil Chemical Company (Houston, TX, USA).
• Layer 302 is a blend of 25% by weight of high density polyethylene (HOPE) having a density of 0.96 g/cm 3 , 22% by weight of linear low density polyethylene (LLDPE) having a density of 0.918 g/cm 3 , 18% by weight of linear low density polyethylene (LLDPE) having a density of 0.941 g/cm 3 , 18% by weight of low density polyethylene (LDPE) having density of 0.918 g/cm 3 .
• HOPE high density polyethylene
• LLDPE linear low density polyethylene
• LDPE low density polyethylene
• Layer 303 has the same composition as Layer 301,
• an outer web i unwound from a feed roil and then passed through a high speed in-register printing press to produce a printed outer web.
• An inner web that has been embossed and slit into narrow strips is unwound from a feed roil and is overlaid and centered onto the printed outer web.
• the two webs are folded upon themselves using a triangular fold initiator so as to create a front and back panel in each web.
• the outer web is folded in a manner so that the one panel is longer than the opposing other panel. The longer pane! serves as a lip of the bag.
• each web Upon leaving the folding means, the folded edge of each web are engaged with a tucking element composed of three shaping disks, two disks which contact the inside surface of the inner web and one disk which contacts the outside surface of the outer web, which forms a longitudinally extending inward-facing tuck or a "W shaped gusset in the folded edge of each web.
• the folded and gusseted webs are then drawn between a pair of opposed draw roils and at least one hole is punched into the lip of the bag along with a corresponding tear notch, located near the open mouth of the bag.
• the lateral edges of the outer and inner webs are then sealed together by application of heat and pressure to form the side-seams.
• Each bag is then individualized by cutting along the length of the side-seam between the bag and the leading edge of the succeeding bag. Completed bags are collected in piles or placed on wickets for filling.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bag Frames (AREA)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (1)

Family

ID=54196102

Family Applications (1)

Country Status (4)

Cited By (5)

Citations (5)

Family Cites Families (10)

• 2014
  • 2014-03-24 WO PCT/US2014/031552 patent/WO2015147776A1/en active Application Filing
  • 2014-03-24 MX MX2016012450A patent/MX2016012450A/es unknown
  • 2014-03-24 US US15/123,117 patent/US20170057701A1/en not_active Abandoned
  • 2014-03-24 BR BR112016017050A patent/BR112016017050A2/pt not_active Application Discontinuation

Patent Citations (5)

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