US20040026292A1 - Transportable container for bulk goods and method for forming the container - Google Patents
Transportable container for bulk goods and method for forming the container Download PDFInfo
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- US20040026292A1 US20040026292A1 US10/453,059 US45305903A US2004026292A1 US 20040026292 A1 US20040026292 A1 US 20040026292A1 US 45305903 A US45305903 A US 45305903A US 2004026292 A1 US2004026292 A1 US 2004026292A1
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- Prior art keywords
- bag
- recited
- open top
- outer wrap
- fill material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
- B65B11/04—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated
- B65B11/045—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated by rotating platforms supporting the articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
- B65B1/02—Machines characterised by the incorporation of means for making the containers or receptacles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
- B65B11/58—Applying two or more wrappers, e.g. in succession
Definitions
- This invention relates generally to a container for transporting bulk goods and, more particularly, to a transportable container comprising a bag for receiving fill material and a spirally wound outer wrap for stabilizing the bag.
- Typical containers utilized for transport of bulk particulate fill material are inefficient, do not have a very large volume, and often require a large amount of manual labor be used in filling and handling of the container. Also these containers are typically stacked on top of each other during handling and transport without stabilization resulting in damage to the material. In addition, storage and disassembly of these products requires a large amount of labor and physical plant space.
- Johnstone. et al. discloses in U.S. Pat. No. 5,566,530 method for packaging of irregularly shaped articles, flowable granules, or liquids comprising placing an open framework on a pallet to create a space. The space is filled with the material and then a stretch wrap film is wrapped around the material and the framework. Finally the framework is removed from the film.
- Williamson discloses in U.S. Pat. No. 4,113,146 a container comprising a spirally wound film to form an inner container, this is surrounded by a middle layer of spirally wound polyester filament, which is in turn surrounded by an single outer wrap sheet. The ends of the inner container are closed with ties and a support sling is located between the middle and outer layers.
- Williamson discloses a two ply inner tube covered by an over wrap that is bonded to the inner tube. One end of the inner tube is folded and sealed to form a closed bag like structure.
- U.S. Pat. No. 5,353,936 Dockstader, et al. discloses a protective tray for use in forming a palletized load of stacked bags of particulate material.
- the protective tray comprises double wall corrugated cardboard or rigid plastic and in a preferred embodiment it is surrounded by a stretch wrap that encircles the protective tray and the bags.
- the present invention provides a transportable container that is a space and cost savings alternative to other know containers.
- the transportable container of the present invention generates hoop forces on the fill material that immobilize the fill material in the container, make the container rigid, and prevent the fill material from shifting during transport thereby preventing damage to the fill material.
- the hoop forces promote contact between the components of the fill material, thereby both stabilizing and compressing the fill material, such that the container of the present invention can hold up to three times the amount of fill material as compared to a conventional tote.
- Further advantages include reduced possibility of contamination of the fill material, reduced stacking damage, reduced spoiling, and reduced trapping of the fill material in the container.
- the present container allows easy identification of the contents because the bag and outer wrap are preferably formed from clear materials.
- the present invention functions by coordinating the fill level of the bag with spirals of an outer wrap to generate and maintain hoop forces on the bag and fill material. This invention functions to make loose fill material rigid without damage to fragile loose material.
- the present invention is a transportable container for bulk goods comprising: a bag having a closed base and an open top; a fill material in the bag; and an outer wrap spirally wound around the bag and securing the fill material in the bag.
- the present invention is a method of forming a transportable container for bulk goods comprising the steps of: providing a bag having an opened top and a closed base; and spirally wrapping an outer wrap around the bag while directing a fill material into the bag and maintaining a top edge of the outer wrap near a fill level of the fill material in the bag.
- FIG. 1 is a perspective view of one wrapper system according to the present invention with a flexible bag of the present invention in an open position prior to filling and wrapping;
- FIG. 2 is a perspective view of the system of FIG. 1 during the filling and wrapping stages;
- FIG. 3 is a perspective view of the system of FIG. 1 after filling with an open top of the bag in a folded over position;
- FIG. 4 is a perspective view of the system of FIG. 1 with the bag in the final upward wrapping stage;
- FIG. 5 is a perspective view of the bag in a fully wrapped stage
- FIG. 6 is a perspective view of an alternative embodiment of the system of FIG. 1;
- FIG. 7 is a perspective view of a hoop utilized in the alternative embodiment of FIG. 6;
- FIG. 8 is a perspective view of our alternative embodiment of a turntable.
- FIG. 9 is a side view of an alternative embodiment of the present invention.
- fill material is used as a shorthand version of the wide range of products that can be packaged utilizing the present invention.
- the present invention finds utilization in packaging any sorts of materials that are typically bulk packaged. These items can encompass large bulk packaged pieces as well as very small bulk packaged pieces. Examples of smaller fill materials include, but are not limited to, the following: agricultural products like seeds, rice, grains, vegetables, fruits; chemical products like fine chemicals, pharmaceuticals, raw chemicals, fertilizers; plastics like plastic resin pellets, plastic parts, rejected plastic parts, machined plastic parts; cereals and cereal products such as wheat; a variety of machined parts of all sorts; wood products like wood chips, landscaping material, peat moss, dirt, sand, gravel, rocks and cement.
- the present invention also finds utilization in bulk packaging of larger fill material including, but not limited to: prepared foods; partially processed foods like frozen fish, frozen chicken, other frozen meats and meat products; manufactured items like textiles, clothing, footwear; toys like plastic toys, plastic half parts, metallic parts, soft toys, stuffed animals, and other toys and toy products. All of these types of materials and similar bulk packaged materials are intended to be encompassed in the present specification and claims by this phrase.
- System 10 includes a frame 12 having an upper support 14 spaced apart from a frame base 16 .
- a first support column 18 and a second support column 20 extend between frame base 16 and upper support 14 .
- Frame base 16 includes a pair of base legs 22 .
- An upper turntable 24 is mounted within upper support 14 of system 10 .
- a support rim 26 is mounted to upper turntable 24 and a fill chute 28 projects through upper turntable 24 .
- a fill funnel 30 is aligned with fill chute 28 .
- a conveyor 32 is aligned above fill funnel 30 for delivering a fill material (not shown) to fill funnel 30 .
- System 10 may comprise a conventional stretch wrapping device such as, for example, a Lantech Q series semi-automatic wrapper.
- Extending from upper support 14 are a plurality of cords 34 each of which includes a bag clip 36 at one of its ends.
- Cords 34 are run through a series of pulleys 38 joined to a crank 40 .
- Rotation of crank 40 moves cords 34 and bag clips 36 up or down relative to upper support 14 depending on the direction of rotation of crank 40 .
- Bag clips 36 are attached to the corners of a flexible bag 42 .
- Flexible bag 42 includes an open top 44 and a closed base 46 .
- the closed base 46 can be formed into the bag 42 or the bag 42 can be a continuous tubular roll wherein the closed base 46 is formed by folding over the tube or bunching the tube up.
- the closed base from a continuous tubular roll can also be formed by twisting and tying off a length of the tube which later could be used as a pour spout during subsequent unloading of the fill material 72 .
- bag clips 36 are attached at a position of approximately 50 to 100 inches down from open top 44 . In one embodiment, sufficient length is left to allow the open top 44 to be moved into a folded over position (FIG. 3) so that the bag 42 can be sealed with an outer wrap 58 , as described below.
- Bag 42 is preferably a gusseted bag having dimensions of the closed base 46 of from 40 to 48 inches by from 30 to 40 inches. Preferably bag 42 is from 100 to 190 inches long. For a standard pallet size the bag 42 preferably has a base of about 44 inches by about 36 inches and a length of about 178 inches. Bag 42 can be formed from any food grade material, such as for example, low density polyethylene, high density polyethylene, a food grade polymer, or nylon. The bags can be of a continuous design such as blow molded polyethylene bags or a bag woven from a fiber or plastic. In a preferred embodiment bag 42 is part of a continuous roll of bags 42 .
- the bag 42 can be formed from a wide variety of flexible materials including, but not limited to: breathable plastics, foils, light blocking materials, laminates, moisture barrier films, paper, and other typical bag materials. In some embodiments it is preferable that the bag 42 be designed with a gusseted bottom thereby creating more of a square shape to the base 46 of the bag 42 .
- the bag 42 can furthermore be color coded for rapid material identification from visual clues. Additionally, the bag 42 may include built in loops to enable easier handling of the bag 42 .
- the closed base 46 rests in a bottom support 47 .
- Bottom support 47 can comprise a slipsheet 48 and preferably further includes a shroud 50 when the fill material is very flowable.
- Slipsheet 48 and shroud 50 can be formed from a variety of known materials, such as for example, corrugated cardboard, plastic, and other similar materials.
- Shroud 50 preferably has at least two sides and may have more. In addition, shroud 50 may be circular.
- Shroud 50 can either be attached to slipsheet 48 or it can rest on slipsheet 48 .
- the height of shroud 50 can vary from 4 to 24 inches.
- Bottom support 47 is mounted to a pallet 50 which rests on a lower turntable 54 .
- Pallet 50 can be formed from metal, wood, plastic, corrugated cardboard and other materials as is known in the art. Preferably the pallet has standard surface dimensions of 40 by 48 inches.
- the bag 42 is not associated with a bottom support 47 or a shroud 50 .
- the bottom of the bag 42 may not require additional support, in which case, the bag 42 is simply filled and wrapped with outer wrap 58 in the absence of a shroud 50 or a bottom support 47 .
- the shroud 50 comprises a strip of corrugated cardboard that is fed around the base 46 of the bag 42 and secured to the bag 42 with the initial wrappings of outer wrap 58 . Once the strip of the corrugated cardboard has been placed around the base of the bag 42 the corrugated cardboard is cut and the bag 42 is wrapped with outer wrap 58 as described below. In another embodiment shown in FIG.
- the bag 42 rests on lower turntable 54 which includes a plurality of fingers 120 that can be extended and retracted.
- the fingers 120 are initially extended to provide support to the base 46 of bag 42 during the initial spiral wrapping of outer wrap 58 to provide an initial support to the bag 42 .
- the fingers 120 are retracted and the bag 42 is wrapped as described below.
- the pallet 50 may or may not be present.
- System 10 further includes a wrap head 56 .
- Wrap head 56 includes a roll of outer wrap 58 and a base 60 .
- Wrap 58 is preferably a stretch wrap having a high cling factor.
- the wrap 58 is from 50 to 200 gauge; preferably 50 to 150 gauge, and more preferably 90 to 110 gauge and has a width of from 10 to 30 inches. Most preferably, wrap 58 is 100 gauge and has a width of 20 inches.
- Wrap 58 can be any of a variety of stretch wrap films known in the art. In some embodiments the wrap 58 is slit into a series of strips to reduce costs and weight of the wrap 58 .
- the wrap 58 is a stretch net or webbing to reduce costs and weight of the wrap 58 .
- Wrap head 56 is vertically moveable along a guide rod 62 . Wrap head 56 is moved up and down guide rod 62 by a motor (not shown).
- An outer wrap clamp 64 is mounted to a portion of lower turntable 54 .
- a fill sensor 66 is retractably extended into flexible bag 42 .
- flexible bag 42 is shown in a pre-loading position and open top 44 is in an open position.
- a portion of the outer wrap 58 is clamped in outer wrap clamp 64 .
- Outer wrap clamp 64 both holds the initial spiral of outer wrap 58 and cuts outer wrap 58 between formation of transportable containers.
- System 10 also includes a fill sensor 66 to monitor the fill level in bag 42 .
- the fill sensor 66 is an ultrasonic transmitter and receiver, this sensor 66 is used to monitor the top level of a fill material 72 in the bag 42 .
- the fill level of the bag 42 is detected in other manners.
- the lower turntable 54 further includes a scale and the advancement of outer wrap 58 up the sides of bag 42 is coordinated with the measured weight of the fill material 72 thus allowing the outer wrap 58 to be maintained at or near the fill level.
- the system 10 includes a timing mechanism that coordinates the movement of outer wrap 58 based on the known fill rate of bag 42 .
- a sonic probe can be used as a fill level sensor to detect the fill level using sound waves.
- the fill sensor 66 is an infrared detector, described below.
- crank 40 is rotated to bring bag 42 to the load position as shown in FIG. 2.
- the upper turntable 24 and lower turntable 54 are rotated in a rotation direction 68 as indicated by the arrow.
- the fill material 72 is run into flexible bag 42 through conveyor 32 , fill funnel 30 and fill chute 28 .
- Fill sensor 66 or the alternatives discussed above are utilized to detect the height of the fill material 72 within flexible bag 42 .
- the upper turntable 24 and lower turntable 54 are rotated at a speed and the wrap head 56 is moved vertically upward such that the outer wrap 58 is always maintained at a level at or near the top of the level of the fill material 72 .
- the fill material 72 may be advantageous to allow the fill material 72 to be above the level of wrap 58 and allow slight bulging of the bag 42 prior to the wrap 58 surrounding the fill material 72 . This allows the development of a cone shape to the finished bag 42 .
- the level of the wrap 58 can be plus or minus 12 inches from the fill level, however, for high density material it should be plus or minus 4 inches from the fill level.
- the outer wrap 58 can be rotated around a stationary bag 42 . As the bag 42 is filled fill sensor 66 is slowly withdrawn from flexible bag 42 .
- the system 10 can be adjusted to provide overlapping layers of outer wrap 58 spaced apart from 0.5 to 15 inches.
- the fill material 72 may comprise any bulk packed material such as described above.
- bag 42 be formed of a food grade material, this is not necessary when the fill material 72 is a non-food product.
- system 10 is used to fill bag 42 with either a cereal or a ready-to-eat cereal.
- FIG. 3 flexible bag 42 is shown in the completely filled condition.
- system 10 is stopped at this point in time such that an operator can unclip flexible bag 42 from bag clips 36 and fold over open top 44 into a folded over position as shown in FIG. 3. In this position, the open top is folded over to seal flexible bag 42 . Then, system 10 is again initiated and rotation of the upper turntable 24 and lower turntable 54 is commenced again thereby wrapping additional spiral wrappings of outer wrap 58 around flexible bag 42 . It is also possible to adjust system 10 such that wrap head 56 is advanced to the top of the particulate material 72 prior to moving open top 44 to the folded over position, such that the folded over portion only receives downward wrappings of outer wrap 58 . Alternative methods for closing bag 42 are discussed below.
- FIG. 4 the system 10 is shown in a position of maximal upward vertical movement of the wrap head 56 .
- the upper turntable 24 and lower turntable 54 continue to rotate while the wrap head 56 is moved in a vertically downward direction to complete a second wrapping of outer wrap 58 around flexible bag 42 .
- This downward wrapping can be eliminated if desired, although this may require more wrapping on the upward stroke to make the bag 42 rigid.
- This downward wrapping can be adjusted such that only the bottom support 47 is wrapped to bag 42 or such that pallet 52 is also wrapped to bag 42 .
- flexible bag 42 is shown completely wrapped and removed from system 10 .
- FIG. 6 an alternative embodiment of system 10 is shown.
- open top 44 of flexible bag 24 is held in an open position by a hoop 92 .
- Hoop 92 includes a plurality of bag holders 94 and a plurality of loops 96 that are received on support rim clips 90 mounted to support rim 26 .
- system 10 does not include a fill sensor 66 like that described above.
- system 10 includes a plurality of infrared emitters 84 mounted to a sensor bar 86 .
- Sensor bar 86 is placed across from an infrared detector 88 mounted to wrap head 56 .
- the infrared emitters 84 emit an infrared beam across flexible bag 42 to be detected by infrared detector 88 .
- infrared emitters 84 and infrared detector 88 serve to sense the level of fill material 72 within flexible bag 42 .
- the upper turntable 24 and lower turntable 54 are rotated as wrap head 56 is moved vertically upward and preferably downward along guide rod 62 .
- the speed of rotation of turntables 24 and 54 are correlated with movement of wrap head 56 along guide rod 62 to ensure that the outer wrap 58 is always approximately level with the top of fill material 72 in flexible bag 42 on the upward spiral.
- bag 42 is filled with fill material 72 until it is near the top of flexible bag 42 .
- hoop 74 is removed from rails 82 and open top 44 can be folded over as shown in FIG. 3. Then the procedure continues as outlined in FIGS. 4 and 5, discussed above.
- FIG. 7 is a perspective view of hoop 92 .
- the shape of bag holders 94 and loops 96 permit the open top 44 to be bunched while secured to provide sufficient bag to be moved into the folded over position.
- bag holders 94 include flexible wire like elements 100 to allow them to be inserted into bag 42 and to then friction hold the bag 42 open.
- lower turntable 54 , wrap head 56 , and base 60 are vertically movable.
- the lower turntable 54 is placed at a position very close to upper turntable 24 .
- As the bag 42 fills lower turntable 54 is moved in a downward direction to accommodate additional fill material 72 .
- the advantage of this system is that fragile materials have a lower distance to drop from conveyor 32 into bag 42 .
- Movement of lower turntable 54 can be accomplished by any of a variety of mechanisms including scissors platform legs, hydraulic pistons, pneumatic pistons, or a geared mechanism.
- the open top 44 of bag 42 is held in a bunched manner by a vertically movable top hat piece 130 .
- the fill material 72 is fed into bag 42 using an articulated conveyor mechanism 132 .
- an outer wrap 58 is spirally wrapped around bag 42 , the top hat piece 130 is moved vertically in an upward direction as is the end of the articulated conveyor 132 . Again, this design minimizes the drop distance for a fill material 72 as it is loaded into bag 42 .
- Top hat piece 130 can be moved by a gear mechanism 134 or other mechanisms known in the art.
- open top 44 can be closed or left open depending on fill material 72 .
- certain fill material 72 such as wood chips, sand, gravel, and other fill material 72 , may not require that open top 44 be closed.
- outer wrap 58 would be wrapped around bag 42 in an upward direction to secure fill material 72 in bag 42 .
- open top 44 can be closed in any of a variety of manners known in the art including, but not limited to: sonic or heat welding of open top 44 , closure of open top 44 with a plastic pull tie, closure of open top 44 with wire or rope, closure of open top 44 with a clamp, and other closure means known in the art.
- the process of sealing the top of one bag can also create the bottom of the next bag.
- the bag 42 may be filled with fill materials 72 and outer wrap 58 has been spirally wrapped around bag 42 to include the additional step of placing a nylon strap netting over bag 42 .
- the netting may include a series of loops either at the top or the bottom of the netting to enable the resulting load to handle like a Super Sack®. Moving the unit with the loops rather than the pallet 50 or bottom support would be advantageous in loading cargo ships with a very stable load with the least amount of cost packaging material.
- System 10 preferably includes a control panel 98 to permit an operator to control various functions such as stop, start, rotation speed and wrap head 56 -movement speed. Such controls are known in the art. System 10 further includes conventional controls to maintain proper fill level, outer wrap 58 force, and sequencing. The relationship of these parameters is constantly monitored and automatically adjusted by means known in the art.
- the wrapping of outer wrap 58 about bag 42 generates what are known as hoop forces which apply a gentle squeeze to the fill material 72 , helping to support and firm it.
- the hoop forces stabilize the fill material 72 by promoting controllable contact between the elements of the fill material 72 being loaded into bag 42 , thereby promoting bridging between the components of the fill material 72 .
- the fill material 72 being loaded is a bulk cereal in puff or flake form
- hoop forces promote bridging between cereal pieces, thereby reducing the relative motion between the pieces and immobilizing the cereal within bag 42 .
- adjustable force settings on the wrap head 56 hoop forces can be tailored to the type of fill material 72 being inserted in bag 42 .
- Hoop forces allow for a very compact and rigid container, which does not allow the fill material 72 to shift or get crushed within bag 42 .
- Bag 42 is filled without any internal frame or support means, since the subsequent removal of such a frame or support means would result in the hoop forces being dissipated and also cause dislodging of the fill material 72 which may result in some of the fill material 72 being crushed.
- shroud 50 preferably the sides of shroud 50 are notched and scored in such a way that the hoop forces can be transmitted to the fill material 72 without being absorbed by any corners of the shroud 50 or slipsheet 48 .
- FIG. 10 is an alternative embodiment of a wrapping system 200 .
- Wrapping system 200 includes a lower turntable 54 , a movable top hat 130 , and a wrap head 56 having a roll of outer wrap 58 .
- the top hat 130 and lower turntable 54 are synchronously rotated in unison through a motor 202 and connecting drive shaft 204 .
- Top hat 130 is movable between an upward position as shown in FIG. 10 and a downward position as shown in FIG. 1.
- the top hat 130 includes an inner rim 206 and an outer rim 208 .
- FIG. 11 the top hat 130 is shown in the downward loading position.
- an operator places a bag 42 inside the inner rim 206 and takes the top of the bag 42 over the inner rim 206 and between the inner rim 206 and the outer rim 208 .
- Outer rim 208 is held in an elevated position by a plurality of pneumatic arms 210 such that there is a gap between the outer rim 208 and the inner rim 206 . This is shown in FIGS. 12 and 13.
- the outer rim 208 is shown in the elevated position for loading of the bag 42 .
- Outer rim 208 includes a series of pressure points 212 spaced around the inside of outer rim 208 .
- top hat 130 is raised to the upper position as shown in FIG. 14. In the upper position top hat 130 is aligned with a feed chute 214 for providing fill material 72 to the bag 42 . Initially, hot air is blown through fill chute 214 to expand bag 42 as shown in FIG. 14.
- the fill material 72 is run into bag 42 and the outer wrap 58 is spirally wrapped around the bag 42 at a position near to the fill level of the fill material 72 as shown in FIG. 15.
- the fill material 72 is a compressible material such as fiber, textiles, fiberglass insulation, etc. it is possible to compress the whole bag 42 vertically prior to sealing the bag 42 .
- the advantage of this design would be to reduce the cubic footprint of the material and thereby reduce shipping costs.
- the flexible nature of the bag 42 , wrap 58 , and fill material 72 make this possible.
- the compressed load can be wrapped vertically using vertical wrappers from Lantech.
- FIGS. 16 and 17 show one mechanism for automatically closing bag 42 .
- the mechanism comprises a first swing bar 216 and a second swing bar 218 .
- the first swing bar 216 is swung against the bag 42 to provide a first crease in the bag and then the second swing bar 218 is swung against the bag to fold the top of the bag over as shown in FIG. 17.
- the wrapping of outer wrap 58 is continued in a downward direction as shown in FIG. 18 to produce the final container.
- the bag 42 is placed on a pull-pack type slipsheet 58 or shroud 50 .
- a pull-pack type forklift can be utilized to pull the filled bag 42 off the lower turntable 54 and load it into a vehicle for transportation.
- Such pull-pack slipsheets are known by those of ordinary skill in the art.
Abstract
A transportable container for bulk goods and a method for forming the container are disclosed. The transportable container is formed from a bag having a closed base and an open top. A fill material is filled into the bag and an outer wrap is spirally wrapped around the bag such that the outer wrap secures the fill material in the bag. The method for forming the transportable container includes the steps of securing the open top of the bag in an opened position and supporting a base of the bag. The bag is filled with a fill material and while being filled the fill level of the bag is monitored. Simultaneously with filling of the bag, an outer wrap is spirally wrapped around the bag in an upward direction coordinated with the fill level. Once the bag is filled the open top of the bag is released. In some embodiments the open top is then sealed and in others it is left open.
Description
- This application claims the benefit of U.S. application Ser. Nos. 10/280,969 and 10/280,431, both filed Oct. 25, 2002.
- This invention relates generally to a container for transporting bulk goods and, more particularly, to a transportable container comprising a bag for receiving fill material and a spirally wound outer wrap for stabilizing the bag.
- Typical containers utilized for transport of bulk particulate fill material are inefficient, do not have a very large volume, and often require a large amount of manual labor be used in filling and handling of the container. Also these containers are typically stacked on top of each other during handling and transport without stabilization resulting in damage to the material. In addition, storage and disassembly of these products requires a large amount of labor and physical plant space.
- Johnstone. et al. discloses in U.S. Pat. No. 5,566,530 method for packaging of irregularly shaped articles, flowable granules, or liquids comprising placing an open framework on a pallet to create a space. The space is filled with the material and then a stretch wrap film is wrapped around the material and the framework. Finally the framework is removed from the film.
- Williamson discloses in U.S. Pat. No. 4,113,146 a container comprising a spirally wound film to form an inner container, this is surrounded by a middle layer of spirally wound polyester filament, which is in turn surrounded by an single outer wrap sheet. The ends of the inner container are closed with ties and a support sling is located between the middle and outer layers. In U.S. Pat. No. 4,253,507 Williamson discloses a two ply inner tube covered by an over wrap that is bonded to the inner tube. One end of the inner tube is folded and sealed to form a closed bag like structure.
- In U.S. Pat. No. 3,374,599 Sanders discloses a method comprising dropping the materials into a container mounted to a conveyor, placing a continuous tubular thermoplastic netting around the container, sealing one end of the netting, then dropping the netting and material out of the container onto a second conveyor where the other end of the netting is sealed. The netting may subsequently be heated to form a firmer package.
- In U.S. Pat. No. 5,353,936 Dockstader, et al. discloses a protective tray for use in forming a palletized load of stacked bags of particulate material. The protective tray comprises double wall corrugated cardboard or rigid plastic and in a preferred embodiment it is surrounded by a stretch wrap that encircles the protective tray and the bags.
- Connolly discloses in U.S. Pat. No. 4,136,501 a system comprising wrapping a palletized load with a sheet of thermoplastic netting material. Finally, Humphrey discloses in U.S. Pat. No. 4,299,076 a system for wrapping a stabilizing overwrap around a load mounted on a pallet, which is placed on a rotating turntable. The overwrap has a width that is equal to the height of the load and with each rotation the overwrap undergoes successive increasing stages of tension and stretch.
- The present invention provides a transportable container that is a space and cost savings alternative to other know containers. The transportable container of the present invention generates hoop forces on the fill material that immobilize the fill material in the container, make the container rigid, and prevent the fill material from shifting during transport thereby preventing damage to the fill material. The hoop forces promote contact between the components of the fill material, thereby both stabilizing and compressing the fill material, such that the container of the present invention can hold up to three times the amount of fill material as compared to a conventional tote. Further advantages include reduced possibility of contamination of the fill material, reduced stacking damage, reduced spoiling, and reduced trapping of the fill material in the container. Finally, the present container allows easy identification of the contents because the bag and outer wrap are preferably formed from clear materials. The present invention functions by coordinating the fill level of the bag with spirals of an outer wrap to generate and maintain hoop forces on the bag and fill material. This invention functions to make loose fill material rigid without damage to fragile loose material.
- In one embodiment the present invention is a transportable container for bulk goods comprising: a bag having a closed base and an open top; a fill material in the bag; and an outer wrap spirally wound around the bag and securing the fill material in the bag.
- In another embodiment the present invention is a method of forming a transportable container for bulk goods comprising the steps of: providing a bag having an opened top and a closed base; and spirally wrapping an outer wrap around the bag while directing a fill material into the bag and maintaining a top edge of the outer wrap near a fill level of the fill material in the bag.
- These and other features and advantages of this invention will become more apparent to those skilled in the art from the detailed description of a preferred embodiment. The drawings that accompany the detailed description are described below.
- FIG. 1 is a perspective view of one wrapper system according to the present invention with a flexible bag of the present invention in an open position prior to filling and wrapping;
- FIG. 2 is a perspective view of the system of FIG. 1 during the filling and wrapping stages;
- FIG. 3 is a perspective view of the system of FIG. 1 after filling with an open top of the bag in a folded over position;
- FIG. 4 is a perspective view of the system of FIG. 1 with the bag in the final upward wrapping stage;
- FIG. 5 is a perspective view of the bag in a fully wrapped stage;
- FIG. 6 is a perspective view of an alternative embodiment of the system of FIG. 1;
- FIG. 7 is a perspective view of a hoop utilized in the alternative embodiment of FIG. 6;
- FIG. 8 is a perspective view of our alternative embodiment of a turntable; and
- FIG. 9 is a side view of an alternative embodiment of the present invention.
- Throughout the present specification and phase the phrase fill material is used as a shorthand version of the wide range of products that can be packaged utilizing the present invention. The present invention finds utilization in packaging any sorts of materials that are typically bulk packaged. These items can encompass large bulk packaged pieces as well as very small bulk packaged pieces. Examples of smaller fill materials include, but are not limited to, the following: agricultural products like seeds, rice, grains, vegetables, fruits; chemical products like fine chemicals, pharmaceuticals, raw chemicals, fertilizers; plastics like plastic resin pellets, plastic parts, rejected plastic parts, machined plastic parts; cereals and cereal products such as wheat; a variety of machined parts of all sorts; wood products like wood chips, landscaping material, peat moss, dirt, sand, gravel, rocks and cement. The present invention also finds utilization in bulk packaging of larger fill material including, but not limited to: prepared foods; partially processed foods like frozen fish, frozen chicken, other frozen meats and meat products; manufactured items like textiles, clothing, footwear; toys like plastic toys, plastic half parts, metallic parts, soft toys, stuffed animals, and other toys and toy products. All of these types of materials and similar bulk packaged materials are intended to be encompassed in the present specification and claims by this phrase.
- Referring to the Figures, wherein like numerals indicate like or corresponding parts throughout the several views, in FIG. 1, one embodiment of a wrapping system for forming a transportable container for bulk goods designed according to the present invention is shown generally at10.
System 10 includes aframe 12 having anupper support 14 spaced apart from aframe base 16. Afirst support column 18 and asecond support column 20 extend betweenframe base 16 andupper support 14.Frame base 16 includes a pair ofbase legs 22. Anupper turntable 24 is mounted withinupper support 14 ofsystem 10. Asupport rim 26 is mounted toupper turntable 24 and afill chute 28 projects throughupper turntable 24. Afill funnel 30 is aligned withfill chute 28. Aconveyor 32 is aligned abovefill funnel 30 for delivering a fill material (not shown) to fillfunnel 30.System 10 may comprise a conventional stretch wrapping device such as, for example, a Lantech Q series semi-automatic wrapper. - Extending from
upper support 14 are a plurality ofcords 34 each of which includes abag clip 36 at one of its ends.Cords 34 are run through a series ofpulleys 38 joined to a crank 40. Rotation of crank 40moves cords 34 and bag clips 36 up or down relative toupper support 14 depending on the direction of rotation ofcrank 40. Bag clips 36 are attached to the corners of aflexible bag 42. -
Flexible bag 42 includes an open top 44 and aclosed base 46. Theclosed base 46 can be formed into thebag 42 or thebag 42 can be a continuous tubular roll wherein theclosed base 46 is formed by folding over the tube or bunching the tube up. The closed base from a continuous tubular roll can also be formed by twisting and tying off a length of the tube which later could be used as a pour spout during subsequent unloading of thefill material 72. Preferably, bag clips 36 are attached at a position of approximately 50 to 100 inches down from open top 44. In one embodiment, sufficient length is left to allow the open top 44 to be moved into a folded over position (FIG. 3) so that thebag 42 can be sealed with anouter wrap 58, as described below.Bag 42 is preferably a gusseted bag having dimensions of theclosed base 46 of from 40 to 48 inches by from 30 to 40 inches. Preferablybag 42 is from 100 to 190 inches long. For a standard pallet size thebag 42 preferably has a base of about 44 inches by about 36 inches and a length of about 178 inches.Bag 42 can be formed from any food grade material, such as for example, low density polyethylene, high density polyethylene, a food grade polymer, or nylon. The bags can be of a continuous design such as blow molded polyethylene bags or a bag woven from a fiber or plastic. In apreferred embodiment bag 42 is part of a continuous roll ofbags 42. - The
bag 42 can be formed from a wide variety of flexible materials including, but not limited to: breathable plastics, foils, light blocking materials, laminates, moisture barrier films, paper, and other typical bag materials. In some embodiments it is preferable that thebag 42 be designed with a gusseted bottom thereby creating more of a square shape to thebase 46 of thebag 42. Thebag 42 can furthermore be color coded for rapid material identification from visual clues. Additionally, thebag 42 may include built in loops to enable easier handling of thebag 42. - In one embodiment, the
closed base 46 rests in abottom support 47.Bottom support 47 can comprise aslipsheet 48 and preferably further includes ashroud 50 when the fill material is very flowable. Slipsheet 48 andshroud 50 can be formed from a variety of known materials, such as for example, corrugated cardboard, plastic, and other similar materials.Shroud 50 preferably has at least two sides and may have more. In addition,shroud 50 may be circular.Shroud 50 can either be attached to slipsheet 48 or it can rest onslipsheet 48. The height ofshroud 50 can vary from 4 to 24 inches.Bottom support 47 is mounted to apallet 50 which rests on alower turntable 54.Pallet 50 can be formed from metal, wood, plastic, corrugated cardboard and other materials as is known in the art. Preferably the pallet has standard surface dimensions of 40 by 48 inches. - In other embodiments, the
bag 42 is not associated with abottom support 47 or ashroud 50. Depending on the fill material, the bottom of thebag 42 may not require additional support, in which case, thebag 42 is simply filled and wrapped withouter wrap 58 in the absence of ashroud 50 or abottom support 47. In another embodiment, theshroud 50 comprises a strip of corrugated cardboard that is fed around thebase 46 of thebag 42 and secured to thebag 42 with the initial wrappings ofouter wrap 58. Once the strip of the corrugated cardboard has been placed around the base of thebag 42 the corrugated cardboard is cut and thebag 42 is wrapped withouter wrap 58 as described below. In another embodiment shown in FIG. 8, thebag 42 rests onlower turntable 54 which includes a plurality offingers 120 that can be extended and retracted. In this embodiment, thefingers 120 are initially extended to provide support to thebase 46 ofbag 42 during the initial spiral wrapping ofouter wrap 58 to provide an initial support to thebag 42. After several wraps ofouter wrap 58 thefingers 120 are retracted and thebag 42 is wrapped as described below. In this embodiment, thepallet 50 may or may not be present. - Rotation of
lower turntable 54 andupper turntable 24 are synchronized such that they rotate in unison.System 10 further includes awrap head 56.Wrap head 56 includes a roll ofouter wrap 58 and abase 60.Wrap 58 is preferably a stretch wrap having a high cling factor. Thewrap 58 is from 50 to 200 gauge; preferably 50 to 150 gauge, and more preferably 90 to 110 gauge and has a width of from 10 to 30 inches. Most preferably, wrap 58 is 100 gauge and has a width of 20 inches.Wrap 58 can be any of a variety of stretch wrap films known in the art. In some embodiments thewrap 58 is slit into a series of strips to reduce costs and weight of thewrap 58. In other embodiments thewrap 58 is a stretch net or webbing to reduce costs and weight of thewrap 58.Wrap head 56 is vertically moveable along aguide rod 62.Wrap head 56 is moved up and downguide rod 62 by a motor (not shown). Anouter wrap clamp 64 is mounted to a portion oflower turntable 54. In one embodiment, afill sensor 66 is retractably extended intoflexible bag 42. In FIG. 1,flexible bag 42 is shown in a pre-loading position and open top 44 is in an open position. A portion of theouter wrap 58 is clamped inouter wrap clamp 64.Outer wrap clamp 64 both holds the initial spiral ofouter wrap 58 and cutsouter wrap 58 between formation of transportable containers.System 10 also includes afill sensor 66 to monitor the fill level inbag 42. In one embodiment thefill sensor 66 is an ultrasonic transmitter and receiver, thissensor 66 is used to monitor the top level of afill material 72 in thebag 42. - In other embodiments, the fill level of the
bag 42 is detected in other manners. In one embodiment, thelower turntable 54 further includes a scale and the advancement ofouter wrap 58 up the sides ofbag 42 is coordinated with the measured weight of thefill material 72 thus allowing theouter wrap 58 to be maintained at or near the fill level. In other embodiments, thesystem 10 includes a timing mechanism that coordinates the movement ofouter wrap 58 based on the known fill rate ofbag 42. Alternatively, a sonic probe can be used as a fill level sensor to detect the fill level using sound waves. In either embodiment thefill sensor 66 is an infrared detector, described below. - Once a
bag 42 is loaded intosystem 10crank 40 is rotated to bringbag 42 to the load position as shown in FIG. 2. As shown in FIG. 2, theupper turntable 24 andlower turntable 54 are rotated in arotation direction 68 as indicated by the arrow. Initially, thefill material 72 is run intoflexible bag 42 throughconveyor 32, fillfunnel 30 and fillchute 28.Fill sensor 66 or the alternatives discussed above are utilized to detect the height of thefill material 72 withinflexible bag 42. Asflexible bag 42 fills withfill material 72 theupper turntable 24 andlower turntable 54 are rotated at a speed and thewrap head 56 is moved vertically upward such that theouter wrap 58 is always maintained at a level at or near the top of the level of thefill material 72. Withcertain fill material 72, such as rice, it may be advantageous to allow thefill material 72 to be above the level ofwrap 58 and allow slight bulging of thebag 42 prior to thewrap 58 surrounding thefill material 72. This allows the development of a cone shape to thefinished bag 42. Forother fill material 72 it is advantageous to keep thewrap 58 level with or slightly ahead of the level of thefill material 72. With low density material the level of thewrap 58 can be plus or minus 12 inches from the fill level, however, for high density material it should be plus or minus 4 inches from the fill level. In an alternative embodiment, theouter wrap 58 can be rotated around astationary bag 42. As thebag 42 is filledfill sensor 66 is slowly withdrawn fromflexible bag 42. Thesystem 10 can be adjusted to provide overlapping layers ofouter wrap 58 spaced apart from 0.5 to 15 inches. - As discussed above, the
fill material 72 may comprise any bulk packed material such as described above. When loading food products it is preferable thatbag 42 be formed of a food grade material, this is not necessary when thefill material 72 is a non-food product. In one preferred embodiment,system 10 is used to fillbag 42 with either a cereal or a ready-to-eat cereal. - For certain types of
fill material 72 it can be advantageous to settle thefill material 72 as thebag 42 is being filled. To accomplish thislower turntable 54 can be modified to incorporate a vibratory shaker thereby permitting thelower turntable 54 to settle thefill material 72 as thebag 42 is being filled. - In FIG. 3
flexible bag 42 is shown in the completely filled condition. In one embodiment,system 10 is stopped at this point in time such that an operator can unclipflexible bag 42 frombag clips 36 and fold over open top 44 into a folded over position as shown in FIG. 3. In this position, the open top is folded over to sealflexible bag 42. Then,system 10 is again initiated and rotation of theupper turntable 24 andlower turntable 54 is commenced again thereby wrapping additional spiral wrappings ofouter wrap 58 aroundflexible bag 42. It is also possible to adjustsystem 10 such thatwrap head 56 is advanced to the top of theparticulate material 72 prior to moving open top 44 to the folded over position, such that the folded over portion only receives downward wrappings ofouter wrap 58. Alternative methods forclosing bag 42 are discussed below. - In FIG. 4 the
system 10 is shown in a position of maximal upward vertical movement of thewrap head 56. In one embodiment, theupper turntable 24 andlower turntable 54 continue to rotate while thewrap head 56 is moved in a vertically downward direction to complete a second wrapping ofouter wrap 58 aroundflexible bag 42. This downward wrapping can be eliminated if desired, although this may require more wrapping on the upward stroke to make thebag 42 rigid. This downward wrapping can be adjusted such that only thebottom support 47 is wrapped tobag 42 or such thatpallet 52 is also wrapped tobag 42. In FIG. 5flexible bag 42 is shown completely wrapped and removed fromsystem 10. - In FIG. 6 an alternative embodiment of
system 10 is shown. In this embodiment,open top 44 offlexible bag 24 is held in an open position by ahoop 92.Hoop 92 includes a plurality ofbag holders 94 and a plurality ofloops 96 that are received on support rim clips 90 mounted to supportrim 26. In this embodiment,system 10 does not include afill sensor 66 like that described above. Insteadsystem 10 includes a plurality ofinfrared emitters 84 mounted to asensor bar 86.Sensor bar 86 is placed across from aninfrared detector 88 mounted to wraphead 56. In use, theinfrared emitters 84 emit an infrared beam acrossflexible bag 42 to be detected byinfrared detector 88. Thus,infrared emitters 84 andinfrared detector 88 serve to sense the level offill material 72 withinflexible bag 42. As in the first embodiment, theupper turntable 24 andlower turntable 54 are rotated aswrap head 56 is moved vertically upward and preferably downward alongguide rod 62. The speed of rotation ofturntables wrap head 56 alongguide rod 62 to ensure that theouter wrap 58 is always approximately level with the top offill material 72 inflexible bag 42 on the upward spiral. As described above,bag 42 is filled withfill material 72 until it is near the top offlexible bag 42. At this point, hoop 74 is removed from rails 82 and open top 44 can be folded over as shown in FIG. 3. Then the procedure continues as outlined in FIGS. 4 and 5, discussed above. - FIG. 7 is a perspective view of
hoop 92. The shape ofbag holders 94 andloops 96 permit the open top 44 to be bunched while secured to provide sufficient bag to be moved into the folded over position. Preferablybag holders 94 include flexible wire likeelements 100 to allow them to be inserted intobag 42 and to then friction hold thebag 42 open. - In other embodiments,
lower turntable 54, wraphead 56, andbase 60 are vertically movable. In this embodiment, during the initial stages of fillingbag 42 thelower turntable 54 is placed at a position very close toupper turntable 24. As thebag 42 fillslower turntable 54 is moved in a downward direction to accommodateadditional fill material 72. The advantage of this system is that fragile materials have a lower distance to drop fromconveyor 32 intobag 42. Movement oflower turntable 54 can be accomplished by any of a variety of mechanisms including scissors platform legs, hydraulic pistons, pneumatic pistons, or a geared mechanism. In an alternative embodiment shown in FIG. 9, theopen top 44 ofbag 42 is held in a bunched manner by a vertically movabletop hat piece 130. Thefill material 72 is fed intobag 42 using an articulatedconveyor mechanism 132. Asbag 42 is filled anouter wrap 58 is spirally wrapped aroundbag 42, thetop hat piece 130 is moved vertically in an upward direction as is the end of the articulatedconveyor 132. Again, this design minimizes the drop distance for afill material 72 as it is loaded intobag 42.Top hat piece 130 can be moved by agear mechanism 134 or other mechanisms known in the art. - In alternative embodiments, open top44 can be closed or left open depending on
fill material 72. For example,certain fill material 72 such as wood chips, sand, gravel, andother fill material 72, may not require that open top 44 be closed. In such instances,outer wrap 58 would be wrapped aroundbag 42 in an upward direction to securefill material 72 inbag 42. Alternatively, open top 44 can be closed in any of a variety of manners known in the art including, but not limited to: sonic or heat welding of open top 44, closure of open top 44 with a plastic pull tie, closure of open top 44 with wire or rope, closure of open top 44 with a clamp, and other closure means known in the art. In embodiments where continuous tubular rolls and sonic or heat welding of the open top are used, the process of sealing the top of one bag can also create the bottom of the next bag. In certain embodiments, it may be advantageous to eliminate the downward spiral wrapping ofouter wrap 58 aroundbag 42. Depending on the type offill material 72 this may require more spiral wrapping ofouter wrap 58 in the upward direction. - In alternative embodiments, it may be advantageous once the
bag 42 has been filled withfill materials 72 andouter wrap 58 has been spirally wrapped aroundbag 42 to include the additional step of placing a nylon strap netting overbag 42. The netting may include a series of loops either at the top or the bottom of the netting to enable the resulting load to handle like a Super Sack®. Moving the unit with the loops rather than thepallet 50 or bottom support would be advantageous in loading cargo ships with a very stable load with the least amount of cost packaging material. -
System 10 preferably includes acontrol panel 98 to permit an operator to control various functions such as stop, start, rotation speed and wrap head 56-movement speed. Such controls are known in the art.System 10 further includes conventional controls to maintain proper fill level,outer wrap 58 force, and sequencing. The relationship of these parameters is constantly monitored and automatically adjusted by means known in the art. - The wrapping of
outer wrap 58 aboutbag 42 generates what are known as hoop forces which apply a gentle squeeze to thefill material 72, helping to support and firm it. The hoop forces stabilize thefill material 72 by promoting controllable contact between the elements of thefill material 72 being loaded intobag 42, thereby promoting bridging between the components of thefill material 72. For example, when thefill material 72 being loaded is a bulk cereal in puff or flake form, hoop forces promote bridging between cereal pieces, thereby reducing the relative motion between the pieces and immobilizing the cereal withinbag 42. By using adjustable force settings on thewrap head 56, hoop forces can be tailored to the type offill material 72 being inserted inbag 42. Hoop forces allow for a very compact and rigid container, which does not allow thefill material 72 to shift or get crushed withinbag 42.Bag 42 is filled without any internal frame or support means, since the subsequent removal of such a frame or support means would result in the hoop forces being dissipated and also cause dislodging of thefill material 72 which may result in some of thefill material 72 being crushed. Whenshroud 50 is used, preferably the sides ofshroud 50 are notched and scored in such a way that the hoop forces can be transmitted to thefill material 72 without being absorbed by any corners of theshroud 50 orslipsheet 48. - FIG. 10 is an alternative embodiment of a
wrapping system 200.Wrapping system 200 includes alower turntable 54, a movabletop hat 130, and awrap head 56 having a roll ofouter wrap 58. Thetop hat 130 andlower turntable 54 are synchronously rotated in unison through amotor 202 and connectingdrive shaft 204.Top hat 130 is movable between an upward position as shown in FIG. 10 and a downward position as shown in FIG. 1. Thetop hat 130 includes aninner rim 206 and anouter rim 208. - In FIG. 11 the
top hat 130 is shown in the downward loading position. In this position an operator places abag 42 inside theinner rim 206 and takes the top of thebag 42 over theinner rim 206 and between theinner rim 206 and theouter rim 208.Outer rim 208 is held in an elevated position by a plurality ofpneumatic arms 210 such that there is a gap between theouter rim 208 and theinner rim 206. This is shown in FIGS. 12 and 13. In FIG. 12 theouter rim 208 is shown in the elevated position for loading of thebag 42.Outer rim 208 includes a series ofpressure points 212 spaced around the inside ofouter rim 208. Once thebag 42 has been loaded overinner rim 206 thepneumatic arms 210 are lowered as shown in FIG. 13 andpressure points 212contact bag 42 and press it againstinner rim 206 to holdbag 42 withintop hat 130. - Once the
bag 42 has been loaded intotop hat 130 thetop hat 130 is raised to the upper position as shown in FIG. 14. In the upper positiontop hat 130 is aligned with afeed chute 214 for providingfill material 72 to thebag 42. Initially, hot air is blown throughfill chute 214 to expandbag 42 as shown in FIG. 14. - As described above, the
fill material 72 is run intobag 42 and theouter wrap 58 is spirally wrapped around thebag 42 at a position near to the fill level of thefill material 72 as shown in FIG. 15. - If the
fill material 72 is a compressible material such as fiber, textiles, fiberglass insulation, etc. it is possible to compress thewhole bag 42 vertically prior to sealing thebag 42. The advantage of this design would be to reduce the cubic footprint of the material and thereby reduce shipping costs. The flexible nature of thebag 42, wrap 58, and fillmaterial 72 make this possible. The compressed load can be wrapped vertically using vertical wrappers from Lantech. - As described above, once the
fill material 72 is at the proper level in thebag 42 thebag 42 can be closed by a number of different mechanisms and methods, described above, or it can be left open depending on the type offill material 72. FIGS. 16 and 17 show one mechanism for automatically closingbag 42. The mechanism comprises afirst swing bar 216 and asecond swing bar 218. Thefirst swing bar 216 is swung against thebag 42 to provide a first crease in the bag and then thesecond swing bar 218 is swung against the bag to fold the top of the bag over as shown in FIG. 17. At this point, the wrapping ofouter wrap 58 is continued in a downward direction as shown in FIG. 18 to produce the final container. - As discussed above, it is possible to utilize the
bag 42 with certain types offill material 72 that do not require apallet 50 be located below thebag 42 on theturntable 54. In one embodiment, thebag 42 is placed on a pull-pack type slipsheet 58 orshroud 50. Once thebag 42 is filled with fill material 72 a pull-pack type forklift can be utilized to pull the filledbag 42 off thelower turntable 54 and load it into a vehicle for transportation. Such pull-pack slipsheets are known by those of ordinary skill in the art. - The foregoing invention has been described in accordance with the relevant legal standards, thus the description is exemplary rather than limiting in nature. Variations and modifications to the disclosed embodiment may become apparent to those skilled in the art and do come within the scope of the invention. Accordingly, the scope of legal protection afforded this invention can only be determined by studying the following claims.
Claims (21)
1. A transportable container for bulk goods comprising:
a bag having a closed base and an open top;
a fill material in said bag; and
an outer wrap spirally wound around said bag and securing said fill material in said bag.
2. A transportable container as recited in claim 1 , wherein said open top is sealed.
3. A transportable container as recited in claim 2 , wherein said open top is sealed by one of a sonic weld, a heat weld, a plastic pull tie, a wire, a rope, or a clamp.
4. A transportable container as recited in claim 1 , wherein said bag comprises a flexible plastic, a breathable plastic, a foil, a light blocking material, a laminate, a moisture barrier film, paper, or a food grade material.
5. A transportable container as recited in claim 1 , said closed base of said bag is gusseted.
6. A transportable container as recited in claim 1 , wherein said outer wrap is slit into a series of strips prior to being spirally wound around said bag.
7. A transportable container as recited in claim 1 , wherein said outer wrap is spirally wound around said bag in an upward direction.
8. A transportable container as recited in claim 7 , wherein said outer wrap is additionally spirally wound around said bag in a downward direction.
9. A transportable container as recited in claim 1 , further comprising a support closely adjacent to said closed base.
10. A transportable container as recited in claim 9 , wherein said support comprises one of a slipsheet, a shroud, or a strip of corrugated material and wherein said outer wrap is spirally wound around said bag and said support.
11. A transportable container as recited in claim 1 , wherein said fill material comprises an agricultural product, a chemical product, a plastic material, a machined material, a cereal, a wood product, a landscaping material, peat moss, dirt, sand, gravel, rocks, a prepared food, a partially prepared frozen food product, or a manufactured product.
12. A transportable container as recited in claim 1 , wherein said bag further comprises handling hoops secured to said bag.
13. A method of forming a transportable container for bulk goods comprising the steps of:
a) providing a bag having an opened top and a closed base; and
b) spirally wrapping an outer wrap around the bag while directing a fill material into the bag and maintaining a top edge of the outer wrap near a fill level of the fill material in the bag.
14. The method of claim 13 , wherein step b) further comprises monitoring the fill level of the fill material in the bag while spirally wrapping the outer wrap around the bag.
15. The method as recited in claim 14 , wherein the fill level is monitored by one of a sonic probe, an infrared detector, a weight of the fill material in the bag, or a timer.
16. The method of claim 13 , comprising the further steps of stopping the directing of a fill material into the bag and then sealing the open top.
17. The method as recited in claim 16 , wherein the step of sealing said open top comprises one of folding over said open top and spirally wrapping said outer wrap around said folded over open top, sonically welding said open top shut, heat welding said open top shut, closing said open top with a plastic pull tie, closing said open top with a wire, closing said open top with a rope, or closing said open top with a clamp.
18. The method as recited in claim 13 , wherein step a) further comprises providing a bag comprising a food grade plastic, a breathable plastic, a foil, a light blocking material, a laminate, a moisture barrier film, or a paper.
19. The method as recited in claim 13 , further comprising the step of providing a removable support closely adjacent to said closed base while spirally wrapping an outer wrap around said closed base and then removing said removable support.
20. The method as recited in claim 19 , comprising providing a plurality of retractable and extendable fingers as the removable support.
21. The method as claimed in claim 13 , comprising the further step of providing a support material closely adjacent to said closed base wherein said support material comprises a slipsheet, a shroud, or a strip of corrugated material.
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US11/340,926 US7174924B2 (en) | 2000-12-15 | 2006-01-27 | Method for forming a transportable container for bulk goods |
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US10/280,431 US20030057129A1 (en) | 1999-12-15 | 2002-10-25 | Transportable container for bulk goods and method for forming the container |
US10/453,059 US20040026292A1 (en) | 2000-12-15 | 2003-06-02 | Transportable container for bulk goods and method for forming the container |
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US10/280,969 Continuation-In-Part US7055293B2 (en) | 1999-12-15 | 2002-10-25 | Transportable container for bulk goods and method for forming the container |
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US20140215968A1 (en) * | 2008-05-28 | 2014-08-07 | Lantech.Com, Llc | Film Clamp And Related Methods And Apparatuses For Wrapping Loads |
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US8191341B2 (en) | 2008-09-03 | 2012-06-05 | Kellogg Company | Method for forming a transportable container for bulk goods |
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US20060151059A1 (en) | 2006-07-13 |
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