Patent Grant
10479599
Not applicable
Not applicable
The present invention relates to a lifting assembly including a lift loop or strap assembly provided for a bulk bag. More particularly, the present invention relates to a lift loop that is connected, such as by sewing, to a fabric patch. The patch, with the connected lift loop, can then be separately heat fused or sealed, or otherwise adhered, to the bulk bag body. Consequently, the fabric patch is an intermediate layer between the lift loop and the bulk bag body, wherein the patch connection to the lift loop preferably includes sewing and the patch connection to the bag body preferably includes heat fusion or adhesive or adhering without sewing.
Many industries exist in which large quantities of materials or products must be contained and transported. Such materials or products can be free-flowing, making it necessary to fully support the entire volume of such materials or products. Thus, industries that deal with storing and transporting dry, flowable products such as sand, fertilizer, granules of plastic, powdered chemicals, carbon black, grains and food products use what are known as flexible intermediate bulk containers, also known as bulk bags, industrial bags, or big bags. The bags are generally made from flexible fabric, typically woven polypropylene or polyethylene. The bags are generally assembled from multiple pieces of flexible fabric, sewn together at stitched joints. However, some bags are heat fused at the seams instead of stitched, and reference is made to patent application publications WO2014/197728, US 2014/0363106, WO2014/197727, and US2014/0360669, which are hereby incorporated herein, for further detail. At some point during use of a bulk bag, the contained material must be lifted via the bulk bag, such as during custody transfer or discharge of the contained material from the bag. Thus, lift loops, straps, or other members are provided on the bulk bag, which can enable and/or facilitate movement of, lifting of, and transport of a bulk bag.
In the prior art, the attachment of lift loops involves a lot of stitching in select areas of the fabrics. This amount of stitching to allow the bag to be safely picked up has the effect of weakening this critical part of the fabric, which is usually in a containment area of a bag, e.g., along one or more sidewalls. Therefore, the prior art is prone to increasing the number of yarns or stitches in the loop attachment area either by process in the weaving or by folding the fabric over at this lift loop attachment point to place more fabric under the stitches to create safe or safer lifting capacity. For example, in the prior art, one of the most common methods of attaching lift loops to bulk bags uses sewing machines to attach loops to bags using a zigzag pattern of stitching that includes 56 inches of stitches for each of two legs of each loop. This totals 112 inches of stitching that generally has 3 stitches per inch. This means that the sewing machine punctures the fabric 336 times. Each puncture weakens the fabrics original strength thus lowering the strength performance of the fabric. Testing has shown that the seam generated by zigzag stitching lowers the final strength of materials by 37%.
The lifting assembly and method of the present invention eliminates the need for stitching lift loops directly to bag fabric, and eliminates a need for stitching of lift loops in a containment area of a bag. It also thus, eliminates the need for extra yarns or stitching in lift attachment areas as described above. In one or more embodiments of the present invention, a lifting assembly eliminates the stitching of the loops to the bag, e.g., by replacing the 4 stitching methods used in the prior art with a heat fused bond or joint that provides about 90% or more of the original fabric strength in the bonded condition.
In the prior art bags with stitched lift loops, for example, if a bag was improperly handled by less than all four lift loops, the lift loops can tear away from the bag by pulling and breaking portions of the side wall from the bag. This causes large holes in the bulk bag product containment area allowing the product to spill out of the bag and/or contamination to enter the bag. This often causes the loss of the product that was being transported in the bulk bag. If the product was considered to be hazardous, then a spill containment action would be needed. Additionally persons handling the bulk bag, or persons near a bulk bag that had the lift loops fail could be seriously harmed or injured.
The apparatus and method of the present invention includes a lifting assembly for a flexible bag, e.g., a bulk bag, various embodiments of which can carry weights in the range of 500 to 5,000 pounds, or weights anywhere therebetween, and sometimes over 5,000 pounds. A lifting assembly includes one or more lift members, wherein each lift member is preferably coupled to a layer of material, e.g., a fabric layer. The fabric layer can be coupled to a flexible bag wherein the fabric layer is preferably an intermediate layer between the lift member and the flexible bag fabric. The fabric layer can be heat fused or otherwise coupled to the bag without stitching or sewing, which eliminates the creation of sew or stitch holes that can breach a containment area of the bag and which can weaken the bag fabric. In preferred embodiments, a lift member, however, is sewn or stitched to the intermediate fabric layer before the intermediate fabric layer is coupled to the bag fabric.
Various embodiments of the present invention solve problems in the prior art with stitched lift loops that are sewn to a fabric bag, by eliminating the need to reinforce the part of the bag to which the lifting loops are sewn, e.g., as is done in the prior art methods as described above. The method and apparatus of the present invention eliminate the need to stitch lift loops directly to bag fabric and thus eliminate weakening of the bag associated with stitching lift loops directly to the bag fabric. In one or more embodiments of the present invention, a lifting assembly eliminates the stitching of the loops to the bag, e.g., by placing the stitching used in the prior art onto an intermediate layer of fabric and creating a heat fused bond between the layer of fabric and the bag fabric that provides about 90% or more of the original fabric strength in the bonded condition.
Another advantage provided by the apparatus and method of the present invention is an additional safeguard provided when handling bulk bags filled with bulk material to both the product within the bag and persons handling the bag. As discussed above, in the prior art, if a bag with lift loops stitched or sewn directly to bag fabric is improperly handled, e.g., by less than all four lift loops, the lift loops often tear away from the bag by pulling and breaking portions of the side wall from the bag. This causes large holes in the bulk bag product containment area allowing the product to spill out of the bag and/or contamination to enter the bag. This often causes the loss of the product that was being transported in the bulk bag. If the product was considered to be hazardous, then a spill containment action would be needed, and persons exposed to the materials that were contained within the bag could be harmed. In one or more preferred embodiments of the present invention, this problem is solved by adding the lift loops to the bulk bag on a separate piece of fabric, wherein the separate piece of fabric is coupled to the bag in a manner in which it can tear away from the bag without damaging the bag, e.g., given any improper handling of the bag. Preferably the separate piece of fabric or material is coupled to the bag so that if the coupler, e.g., a heat fused joint, fails the bag fabric to which the layer of material is coupled is undamaged and the product remains safely contained within the bag with no leakage. Additionally, when a lift loop is sewn to the separate piece of fabric, even if the sewn connection to the separate piece of fabric tears or breaks or creates a hole in the separate piece of fabric, the bag fabric itself, e.g., fabric in a bulk bag product containment area, e.g., of one or more bag side walls, is not harmed or damaged.
Another novel feature of the present invention is the ability to replace the thick prior art lifting loops (e.g., prior art loops of heavy, thicker polypropylene material that is thicker than the bag fabric, which have to be attached through sewing in the prior art), with loops made of the same material as the bag fabric. In various embodiments of the method and apparatus, lift loops are made of the same material as the bag fabric, e.g., polypropylene fabric (e.g., 2 or 3 ounce polypropylene fabric), or polyethylene fabric that can be used for bulk bags, for forming the lift loops or members.
Additionally, by eliminating the sewing or stitching of lift loops, the bag becomes more amenable to recycling. The lift loops that are often sewn in the prior art bags contain polyester stitching threads which are considered to be a form of contamination in the recycling effort for FIBCs. With the present invention, patches may contain sewn lift loops, wherein the patches are heat fused to a bag, for example, but the patches can be removed from the bag by peeling the patch off and breaking the heat fused joint or coupler prior to sending the bags for recycling. Or in one or more version of the present inventions, fabric can be bonded to the product containment bag that form lift loops without sewing an added belting of heavy thick woven polypropylene.
Another issue solved by lifting assemblies of the present invention is strengthening of the failure point experienced in one and two loop design bags. These designs are well known in the art and have been considered the most efficient bag design in the market. Since it uses all the vertical fibers in the bag body to securely lift the weight, this design often uses a lighter weight of fabric than traditional four loop bags. However, even this efficient design is hampered by the loss of strength in the sewn seam area in the prior art. The present invention, by strengthening the seam strength, e.g., with heat fused joints instead of stitched seams, is able to lower the overall fabric strength even more and achieve similar lifting safety.
Another issue resolved by the apparatus and method of the present invention, e.g., when used with a stitchless bulk bag with all heat fused joints for example, is the ability to eliminate a liner needed to secure the product in one and two lift loop bags, and in four lift loop bags. Given the elimination of stitching holes left by the stitching process, there is little need for liner protection against sifting and contamination. Such a stitchless bag is relatively airtight. Due to the highly efficient bonding strength of the stitchless bag invention, e.g., when a bag is formed with all heat fused joints, and/or no stitched joints in a containment area of the bag, the liner can be replaced with a spouted top, for example. This is desirable as the liner often poses problems during product discharge in the prior art. Since the liner is used for product protection from water, a stitchless design with a fully enclosed top spout can adequately protect the product without a liner. Prior art sewn bags including those with stitched lift loops, continually puncture the fabric and the moisture barrier and further, as stated above, weaken the fabric as well.
In various embodiments, a flexible bag comprises a body including a side wall; and a lift loop assembly comprising a lift loop sewn to a patch; wherein the patch is heat sealed or adhered to the body side wall such that the patch is an intermediate layer between the lift loop and the body side wall.
In various embodiments, the patch heat seal extends at least one inch above a sewn area between the lift loop and the patch.
In various embodiments, a patch is heat sealed or adhered to a body side wall and a lift loop sewn to the patch such that the lift loop is not sewn to the body side wall.
In various embodiments, a lift member assembly for a flexible bag comprises a lift member coupled to a fabric layer, the fabric layer for coupling to the flexible bag wherein the fabric layer is an intermediate layer between the lift member and the flexible bag.
In various embodiments, the lift member is coupled to the fabric layer by sewing.
In various embodiments, the fabric layer is configured to be attached to the flexible bag without sewing.
In various embodiments, the fabric layer includes a heat fusion coating for forming a heat seal with the flexible bag, and wherein the fabric layer is coupled to the flexible bag by positioning the fabric layer on the flexible bag and applying heat and pressure.
In various embodiments, the assembly is configured to attach to the flexible bag without puncturing or creating holes in the flexible bag.
In various embodiments, the assembly comprises a second lift member coupled to a second fabric layer, and wherein when the second fabric layer is coupled to the flexible bag, the second fabric layer is an intermediate layer between the second lift member and the flexible bag.
In various embodiments, the assembly comprises a third lift member coupled to a third fabric layer, and wherein when the third fabric layer is coupled to the flexible bag, the third fabric layer is an intermediate layer between the third lift member and the flexible bag.
In various embodiments, the assembly comprises a fourth lift member coupled to a fourth fabric layer, and wherein when the fourth fabric layer is coupled to the flexible bag, the fourth fabric layer is an intermediate layer between the fourth lift member and the flexible bag.
In various embodiments, the lift member is a first lift member and the fabric layer is a first fabric layer, and wherein the first, second, third and fourth fabric layers each include a heat fusion coating.
In various embodiments, the first lift member is sewn to the first fabric layer, the second lift member is sewn to the second fabric layer, the third lift member is sewn to the third fabric layer, and the fourth lift member is sewn to the fourth fabric layer, and wherein the first, second, third and fourth fabric layers are each coupled to the flexible bag by positioning each of the first, second, third and fourth fabric layers on the flexible bag at desired locations on a sidewall of the bag, and applying heat and pressure to the first, second, third, and fourth fabric layers.
In various embodiments, the first, second, third and fourth fabric layers are coupled to the flexible bag simultaneously.
In various embodiments, the first, second, third and fourth fabric layers are not coupled to the flexible bag simultaneously.
In various embodiments, a first heat fused seal is formed between the first fabric layer and the body, a second heat fused seal is formed between the second fabric layer and the body, a third heat fused seal is formed between the third fabric layer and the body, and a fourth heat fused seal is formed between the fourth fabric layer and the body.
In various embodiments, each of the first, second, third and fourth heat fused seals has a seal strength of 100 psi.
In various embodiments, the lift assembly can hold the weight of the contents of the bag when the bag is lifted by the lift members.
In various embodiments, the lift assembly can hold at least two times the weight of the contents of that the bag is designed to hold.
In various embodiments, the lift assembly can hold at least three times the weight of the contents that the bag is designed to hold.
In various embodiments, the lift assembly can hold at least four times the weight of the contents that the bag is designed to hold.
In various embodiments, the lift assembly can hold at least five times the weight of the contents that the bag is designed to hold.
In various embodiments, a flexible bag has a wall and comprises a lift assembly, the lift assembly including a lift member coupled to an intermediate layer, and wherein the intermediate layer is coupled to the bag wall.
In various embodiments, the lift member is sewn to the intermediate layer and wherein the intermediate layer is not sewn to the bag wall.
In various embodiments, the bag has at least a nearly air tight containment area and wherein the lift assembly is coupled to the bag wall so that the bag maintains the at least nearly air tight containment area without creating stitch holes or otherwise puncturing the bag wall.
In various embodiments, the layer of fabric includes a heat fusion coating and wherein the layer of fabric is coupled to the bag wall by positioning the layer of fabric on the bag wall at a desired location and applying heat to the layer of fabric.
In various embodiments, the lift member is a first lift member and the intermediate layer is a first intermediate layer and further comprising a second lift member and a second intermediate layer, a third lift member and a third intermediate layer, and a fourth lift member and a fourth intermediate layer.
In various embodiments, the first lift member is sewn to the first intermediate layer, the second lift member is sewn to the second intermediate layer, the third lift member is sewn to the third intermediate layer, and the fourth lift member is sewn to the fourth intermediate layer, and wherein the first, second, third and fourth intermediate layers are not sewn to the bag wall.
In various embodiments, the bag has an at least nearly air tight containment area and wherein the lift assembly is coupled to the bag wall so that the bag maintains the at least nearly air tight containment area.
In various embodiments, a first heat fused joint couples the first intermediate layer to the bag wall, a second heat fused joint couples the second intermediate layer to the bag wall, a third heat fused joint couples the third intermediate layer to the bag wall, and a fourth heat fused joint couples the fourth intermediate layer to the bag wall.
In various embodiments, the first, second, third and fourth heat fused joints each have a tensile strength of 100 psi.
In various embodiments, the lift assembly can hold at least the weight of the contents of the bag when the bag is lifted by the lift members.
In various embodiments, the lift assembly can hold at least two times the weight of the contents of the bag that the bag is designed to hold.
In various embodiments, the lift assembly can hold at least three times the weight of the contents of the bag that the bag is designed to hold.
In various embodiments, the lift assembly can hold at least four times the weight of the contents of the bag that the bag is designed to hold.
In various embodiments, the lift assembly can hold at least five times the weight of the contents of the bag that the bag is designed to hold.
In various embodiments, the bag is designed to contain 1,000 pounds of bulk material.
In various embodiments, the bag is designed to contain 2,000 pounds of bulk material.
In various embodiments, the bag is designed to contain 3,000 pounds of bulk material.
In various embodiments, the bag is designed to contain 4,000 pounds of bulk material.
In various embodiments, the bag is designed to contain 5,000 pounds of bulk material.
In various embodiments, the bag is designed to contain up to 500 pounds of bulk material.
In various embodiments, the bag is designed to contain 500 to 1,000 pounds of bulk material.
In various embodiments, the bag is designed to contain 1,000 to 2,000 pounds of bulk material.
In various embodiments, the bag is designed to contain 2,000 to 3,000 pounds of bulk material.
In various embodiments, the bag is designed to contain 3,000 to 4,000 pounds of bulk material.
In various embodiments, the bag is designed to contain 4,000 to 5,000 pounds of bulk material.
In various embodiments, the lift member is sewn a distance away from an edge of the intermediate layer.
In various embodiments, each of the first, second, third and fourth lift members are sewn to the respective first, second, third and fourth intermediate layers and are sewn a distance away from an edge of the respective first, second, third and fourth intermediate layers.
In various embodiments, the lift member is sewn at least an inch away from an edge of the intermediate layer.
In various embodiments, each of the first, second, third and fourth lift members are sewn to the respective first, second, third and fourth intermediate layers at least an inch from an edge of the respective first, second, third and fourth intermediate layers.
In various embodiments, the dimensions of the intermediate layer that is coupled to the bag wall determines the amount of weight that the lift assembly can hold.
In various embodiments, increasing the size of the intermediate layer increases the amount of weight that the lift assembly can hold.
In various embodiments, the lift member is a lift loop having a first end and second end, the first and second ends coupled to the intermediate layer a distance away from each other.
In various embodiments, the lift member is a lift loop having a first end and second end, the first and second ends coupled to the intermediate layer a distance away from each other.
In various embodiments, the lift member is coupled to the intermediate layer at least 1 inch below an edge of the intermediate layer.
In various embodiments, the lift member is coupled to the intermediate layer at least 1 inch below an edge of the intermediate layer.
In various embodiments, the lift member is coupled to the intermediate layer at least 2 inches below an edge of the intermediate layer.
In various embodiments, the lift member is coupled to the intermediate layer at least 2 inches below an edge of the intermediate layer.
In various embodiments, the lift member is coupled to the intermediate layer in an arch configuration.
In various embodiments, the lift member is coupled to the intermediate layer in an arch configuration.
In various embodiments, the fabric layer with the lift member coupled thereto is configured to be coupled to the bag via a coupler and wherein if the coupler fails or releases from the bag a containment area of the bag will not be torn or punctured or otherwise exposed.
In various embodiments, the intermediate layer is configured to be coupled to the bag via a coupler, wherein if the coupler fails or releases from the bag, a containment area of the bag will not be torn or punctured or otherwise exposed.
In various embodiments, further comprising more than one lift member and more than one intermediate layer, wherein a said lift member is coupled to a said intermediate layer.
In various embodiments, the said more than one intermediate layers are attached to the bag wall so that if the bag is picked up by less than all of the more than one lift members the intermediate layer is not put into a peel position.
In various embodiments, a method of producing a flexible bag with a lift assembly comprises:
In various embodiments of the method, the lift member is not directly coupled to the bag wall.
In various embodiments of the method, the bag provided has a nearly airtight containment area.
In various embodiments of the method, the intermediate layer is coupled to the bag wall so that the bag maintains the nearly airtight containment area.
In various embodiments of the method, the intermediate layer is coupled to the bag wall via a coupler, the coupler configured to release from the bag wall if the coupler fails without ripping, tearing, breaching or otherwise damaging the bag wall and without exposing material contents of the bag.
In various embodiments of the method, more than one lift assembly is formed.
In various embodiments of the method, the lift member of each of the more than one lift assemblies is not directly coupled to the bag wall.
In various embodiments of the method, the bag provided has a nearly airtight containment area.
In various embodiments of the method, the intermediate layer of each of the more than one lift assemblies is coupled to the bag wall so that the bag maintains the nearly airtight containment area.
In various embodiments of the method, the intermediate layer is coupled to the bag wall via a coupler, the coupler configured to release from the bag wall if the coupler fails without ripping, tearing, breaching or otherwise damaging the bag wall and without exposing material contents of the bag.
In various embodiments of the method, the lift member has first and second ends and a top and bottom surface, and wherein prior to coupling the lift member to the fabric layer, the lift member is folded over or twisted at a location between the first and second ends and wherein the first and second lift member ends are coupled to the fabric layer after folding or twisting the intermediate layer so that a bottom surface of the first end is in contact with the fabric layer and a top surface of the second end is in contact with the fabric layer.
In various embodiments of the method and apparatus, the fabric layer includes a standard coating and the bag fabric includes a heat fusion coating, e.g., having propylene based plastomers and/or elastomers, for forming a heat seal with the flexible bag, and wherein the fabric layer is coupled to the flexible bag by positioning the fabric layer on the flexible bag and applying heat and pressure so that a bond is formed between the heat fusion coating and standard fabric coating.
In various embodiments of the method and apparatus, the fabric layer includes a heat fusion coating, e.g., having propylene based plastomers and/or elastomers, and the bag fabric includes a standard fabric coating, and wherein the fabric layer is coupled to the flexible bag by positioning the fabric layer on the flexible bag and applying heat and pressure so that a bond is formed between the heat fusion coating and standard fabric coating.
In various embodiments of the method and apparatus, the fabric layer includes a heat fusion coating, e.g., having propylene based plastomers and/or elastomers, and the bag fabric also includes a heat fusion coating, and wherein the fabric layer is coupled to the flexible bag by positioning the fabric layer on the flexible bag and applying heat and pressure so that a bond is formed between the heat fusion coating and standard fabric coating.
In various embodiments, the bond formed between a standard fabric coating on an intermediate layer of material and a heat fusion coating on bag fabric is the coupler between an intermediate layer and bag fabric.
In various embodiments, the bond formed between a standard fabric coating on bag fabric and a heat fusion coating on an intermediate layer of material is the coupler between an intermediate layer and bag fabric.
In various embodiments, the bond formed between a heat fusion coating and a heat fusion coating is the coupler between an intermediate layer and bag fabric.
In various embodiments, a fabric piece, e.g., a lift loop or intermediate layer, with a heat fusion coating thereon that faces bag fabric with a standard fabric coating, e.g., a standard polypropylene coating, can be coupled to the bag fabric by positioning the heat fusion coating of the lift loop or intermediate layer so that it faces the standard fabric coating of the bag and applying heat and pressure to form a bond or joint between the standard fabric coating and heat fusion coating.
In various embodiments, a fabric piece, e.g. a lift loop or intermediate layer, with a standard fabric coating, e.g., a standard polypropylene coating thereon, that faces bag fabric with a heat fusion coating, can be coupled to the bag fabric by positioning the standard fabric coating of the lift loop or intermediate layer so that it faces the heat fusion coating of the bag fabric and applying heat and pressure to form a bond or joint between the standard fabric coating and heat fusion coating.
In various embodiments, a fabric piece, e.g. a lift loop or intermediate layer, with a heat fusion coating, that faces bag fabric with a heat fusion coating, can be coupled to the bag fabric by positioning the heat fusion coating of the fabric piece so that it faces the heat fusion coating of the bag fabric and applying heat and pressure to form a bond or joint between the heat fusion coating of the fabric piece and the heat fusion coating of the bag fabric.
For a further understanding of the nature, objects, and advantages of the present invention, reference should be had to the following detailed description, read in conjunction with the following drawings, wherein like reference numerals denote like elements and wherein:
In the drawings and description that follow, like parts are typically marked throughout the specification and drawings with the same reference numerals. The drawing figures are not necessarily to scale. Certain features of the disclosed embodiments may be shown exaggerated in scale or in somewhat schematic form and some details of conventional elements may not be shown in the interest of clarity and conciseness. The present disclosure is susceptible to embodiments of different forms. Specific embodiments are described in detail and are shown in the drawings, with the understanding that the present disclosure is to be considered an exemplification of the principles of the disclosure, and is not intended to limit the disclosure to that illustrated and described herein. It is to be fully recognized that the different teachings of the embodiments discussed below may be employed separately or in any suitable combination to produce desired results.
Unless otherwise specified, in the following discussion and in the claims, the terms “including” and “comprising” are used in an open-ended fashion, and thus should be interpreted to mean “including, but not limited to . . . ”. Any use of any form of the terms “connect”, “engage”, “couple”, “attach”, or any other term describing an interaction between elements is not meant to limit the interaction to direct interaction between the elements and may also include indirect interaction between the elements described. The various characteristics mentioned above, as well as other features and characteristics described in more detail below, will be readily apparent to those skilled in the art upon reading the following detailed description of the embodiments, and by referring to the accompanying drawings.
A lifting assembly 205 can also be used with other types or designs of bulk bags not shown herein, e.g., bulk bags that have four pieces of fabric stitched together to form a continuous sidewall, for example, or baffled 4 loop bulk bags, or one and two lift loop design bulk bags.
A bag 10 can be filled with materials by gravity, for example, fed through a top spout 36. The top spout 36 can be coupled to an upper portion 37 at a seam or joint 41, which may be sewn, heat fused or heat sealed, or connected by other means. The upper portion 37 can be coupled to an intermediate portion 38 at another joint or seam 41. Intermediate portion 38 may also be referred to as a sidewall or body portion. (Unless otherwise noted, all joints or seams 41 can be sewn, heat fused, or connected by other means as discussed above). At a lower end of the intermediate portion 38, a lower portion 39 can be coupled at another joint or seam 41. Finally, at a lower end of the lower portion 39, a bottom or discharge spout 40 can be coupled at another joint or seam 41. Various inner 43 and outer 44 surfaces of the bulk bag 10 and its components as described above may include a coating or lamination 19 (see
In bags including heat fused joints or seams, some surfaces of a bulk bag 10 as described herein and its components preferably include a fusion or heat sealing coating 191 which may be used in bonding, while other surfaces include a standard polypropylene fabric coating or standard polyethylene fabric coating (depending on whether the bag fabric is polyethylene or polypropylene). A fabric piece with a heat fusion coating facing another fabric piece with a heat fusion coating can be joined to form a joint 41 by adding heat and pressure. A fabric piece with a heat fusion coating facing a fabric piece with a standard polypropylene fabric coating for example, can also be joined to form a joint 41 by applying heat and pressure. A fabric piece with a heat fusion coating facing a fabric piece with a standard polyethylene fabric coating, for example, can also be joined to form a joint 41 by applying heat and pressure. Reference is made to patent publication numbers WO2014/197728, US2014/0363106, WO2014/197727, and US2014/0360669, incorporated herein by reference for additional information on forming heat fused joints in a bulk bag.
A fusion or heat sealing coating 191 preferably comprises propylene based plastomers and elastomers. Various embodiments of a heat sealing coating can comprise propylene based elastomers, propylene based plastomers or a combination thereof. More preferably, the coating comprises about 50% to 90% of propylene-based plastomers, propylene-based elastomers, or mixtures thereof and about 10% to 50% polyethylene resins and additives, having a melting point that is preferably at least about 5 degrees lower than the melting point of the fabrics to be joined together.
Portions 37, 38, and 39 may sometimes together be referred to herein as a containment area or body of the bag 10. Intermediate portion 38 may also be referred to as a body panel or body portion or side wall of a bag 10.
In the bag 10 as shown in
A bulk bag 10 can be emptied by gravity, or via other suitable discharge means, through a discharge spout 40. Before discharge, a discharge spout 40 is preferably closed in such a manner that the contained materials are prevented from discharging until the bag 10 is properly positioned over a receiving hopper or other desired receptacle and ready for discharge, e.g., suspended by lift loops over a receiving hopper or other receptacle.
A bag connection assembly 220 preferably includes a patch or intermediate member 222 and a connection 224. Preferably patch or intermediate member 222 is configured to be directly coupled to the fabric of bag 10, e.g., on an intermediate panel or side wall 38, and/or at one or more other walls of a bag 10. An intermediate member 222 can be coupled to a bulk bag 10, for example, wherein it extends from one side wall (e.g., at side walls 251, 252, 253, 254 of intermediate panel 38) across a corner, e.g., corner location 261, 262, 263, 264, respectively, to an adjacent sidewall (see
Preferably a lift assembly 210, is directly coupled to top surface 241 of an intermediate member 222 and is not directly coupled to the bag 10 fabric, e.g., to a bag wall or otherwise to an outer surface 44 of a bag 10. Preferably a bottom surface 240 of patch or intermediate member 222 is directly coupled to a bag 10, with a joint or coupling formed between a coating on the bottom surface 240 of patch 222 and a coating on an exterior surface 44 of the bag fabric, as will be described further below. Patch 222 can be single layer ounce polypropylene fabric. Patch 222 can be the same or similar to the polypropylene fabric used to form a bag 10.
A lift assembly 205 is an improvement over prior art lift loops that are directly coupled to the bag fabric, e.g., via stitching or sewing. As discussed above, if directly stitched or sewn to bag fabric, e.g., at a side wall or intermediate wall 38, if the lift loop of lift assembly 210 fails, e.g., tears away from a patch 222, or otherwise becomes uncoupled from patch 222, the bag fabric itself will be undamaged since the lift loop or member 212 is not directly coupled to the bag fabric. Additionally, preferably patch or intermediate member 220 is not stitched to a bag 10 but coupled to a bag 10 via heat fusion or with suitable adhesives. Thus, if a patch 222 tears away from a bag 10, or otherwise becomes uncoupled from a bag 10, then the bag fabric will not be torn or ripped. A containment area of a bag 10, therefore, is left unaffected and/or undamaged if a lift assembly 205 with a stitched lift loop assembly 222 and heat fused bag connection assembly 220 fails, without material contents of the bag being exposed to air or moisture or otherwise contaminated, and without leaking from a bag 10.
In a lift assembly 205, although lift loops 212 of lift loop assembly 210 can be heat fused to a patch 222, or coupled to patch 222 with an adhesive, preferably loops 212 are sewn or stitched to patch 222, with patch 222 then not being sewn or stitched directly to the bag fabric. When lift loops or members 212 are attached directly to bag fabric, or to a patch or intermediate member 222 via heat fusion or an adhesive, if pulled or lifted in a sheer position, the lift loops or members can hold enormous weights, but if pulled in a peel position (e.g., if one attempts to the move the bag by only one lift loop, or less than all of the lift loops on a bag, or with attempts to lift the bag via the lift loops in a direction otherwise than upwards), such loops have weak peel strength and can easily detach from a bulk bag or intermediate member or patch 222. Lift loops 212 attached via heat seal can have weak resistance to peeling forces, for example, if a lift loop is pulled in a 90 degree angle away from the bag, it is put into a peel position and is likely to fail. By stitching a lift loop 212 to a patch 222 that is heat fused to a bag 10, in this manner, for a bag 10 with a lifting assembly 205 and all heat fused seams or joints, a containment area of the bag 10 remains nearly air tight even if the lifting assembly fails, and if lift loops 212 are sewn to a patch 222 problems associated with weak peel strength of heat fused loops 212 can be lessened or eliminated.
Although a patch 222 can be sewn or stitched to a bulk bag 10, preferably it is heat fused, or coupled to a bag 10 with an adhesive, to prevent creation of stitch holes in bag 10 fabric or weakening of the bag 10 fabric at the stitch location.
Referring now to
Referring now to
In
As discussed, in the most preferred embodiments, a patch 222 is heat sealed or heat fused, or otherwise adhered to a bag 10 without sewing or stitching. Preferably a patch 222 includes a heat fusion coating 191 or standard laminate coating 19 on bottom surface 240 of patch 222 (see
If a patch 222 will be coupled to a body portion 38 that includes a standard polypropylene or standard polyethylene fabric coating on an exterior surface 44 of body portion 38, then preferably patch 222 has a heat fusion coating 191 on bottom surface 240 of patch 222. Patch 222 could also have either a heat fusion coating 191 or a standard polypropylene coating 19 on a bottom surface 240 of the patch 222 if a bag intermediate portion 38, or other portion of a bag 10 to which the patch will be coupled, has a heat fusion coating 191 on an exterior surface 44.
Preferably a bag body or intermediate portion 38 will include a standard coating 19, and patch 222 will include a heat fusion coating 191. In this manner, less heat fusion coating 191, which is more expensive than standard coatings 19, is utilized during the overall process of a making a bag with a lift assembly 205, resulting in lower cost.
To attach a patch 222 to a body or intermediate portion 38 or other bag wall, a bottom surface of patch 222 having a standard 19 or fusion 191 coating is preferably positioned over an exterior surface of bag body portion 38 having either a standard 19 or heat fusion coating 191, respectively, in a desired position and heat and pressure is applied. For more information on heating sealing or fusing, or adhering polypropylene or polyethylene fabric pieces, reference is made to patent applications WO 2014/197728, US 2014/0363106, WO 2014/197727, and US 2014/0360669, incorporated herein by reference, for further detail.
In some embodiments, by sewing the lift loop 212 to the patch 222 of fabric not initially associated with product containment area fabric, e.g. at intermediate portion 38, sewing is not applied to the product containment area fabric, e.g., at intermediate portion 38. Instead, the patch 222 is an intermediate layer of fabric that is attached to the product containment fabric using either a heat fusion or seal method, or by using an adhesive. In other words, sewing or stitch holes from attaching lift loops in a product containment area can be eliminated.
When a patch 222 is coupled to bag 10 fabric via heat fusion, a joint is formed between the standard fabric 19 and fusion coating 191 of the patch or bag fabric respectively, or between fusion coating 191 and fusion coating 191 of the patch or bag fabric respectively. If a heat fused joint fails, or if an adhesive bond fails (e.g., breaks away or otherwise becomes uncoupled from the bag 10 fabric), the heat seal and adhesive do not cause the bag fabric (e.g., intermediate portion 38 of the bulk bag 10), to fail. If a heat fused joint or adhesive fails so that a heat fused joint degrades or breaks away, the intermediate layer or patch 222 is released from the bag body or fabric without damaging the bag fabric or a containment area of the bag. Should a sewn lift loop 212 connection at area 224 fail, the lift loop 212 that is sewn to a patch 222 may tear only the patch 222 and not the bag fabric, and the contained product remains secure in the bulk bag 10 without damage to the product or the environment. Likewise if a heat fused connection of lift loop 212 in area 224 of patch 222 should fail, the containment area of the bag and bag fabric is left unaffected.
In exemplary embodiments, the heat seal method described herein and in the noted patent applications incorporated herein by reference, produces a heat seal or fused joint tensile strength of about 100 psi. Since bulk bags are expected to provide a lifting safety ratio of 5 to 1, then, for example, a bulk bag carrying a 2,200 pound load would need to generate about 11,000 pounds of lift. Therefore, if used with a said bag, each lifting assembly 205 must have around 3,750 pounds of lift to meet this standard. Based on current test results, at 100 psi, a minimum of about 38 square inches of patch 222 material needs to be heat fused or adhered wherein the resulting heat fused joint is at full strength. A heat fused joint is considered herein to be at full strength if the joint retains at least about 90% of the fabric strength. A fabric patch can be coupled to a bag wherein a heat fused joint formed between bag fabric and patch 222 extends along an entire bottom surface 140 of patch 222, which can create a full strength joint or a joint that retains at least 90% of the fabric strength. Preferably a patch 222 is coupled to the bag 10 fabric so that there are no graspable edges of the patch 222, e.g., no edges that can be gripped or grasped, or unintentionally or accidentally pulled or snagged during handling of a bag 10.
Testing has shown that as such a bag is lifted with weights of about 2,200 lbs, forces against the lift loop attachment or joint are not always evenly applied, and the attachment seals or joints can be affected unevenly from edges of the seal or joint. Thus, in certain embodiments, a patch 222 that is about 18 inches wide by 18 inches long is preferably used. Such a patch size provides the full lifting safety needed to qualify a bulk bag 10 for 5 to 1 lifting safety requirements for 2,200 lbs. As illustrated in
In some embodiments, by changing the size of the patch 222, greater or lesser weights can be carried by the bulk bag 10. In various embodiments the size of the patch selected is selected based on the bag to which it will be coupled and the weight for which the bag is designed to carry.
While many different configurations are available to create a strong lift loop patch assembly, in certain embodiments a lift loop 212 is applied in an arch configuration. In some embodiments, the arch loop spreads the lift loop legs or ends 216 apart at the point of sewing or otherwise coupling the lift loop ends 216 to the patch 222 (as shown in
In some embodiments, a lift loop or member 212 is twisted or folded prior to sewing it to a patch 222, e.g., at twist or fold area 228 as shown in
As discussed above, when attaching a lift loop assembly 210 via heat sealing to a patch 222, this means the heat seals can have weak resistance to peeling forces. If the lift loop is pulled in about a 90 degree angle away from the bag, it is put into a peel position and is likely to fail, e.g., the bond joining the lift loop to the patch or bag will break or tear or peel away. To address this, in some embodiments, the sewing of the lift loop 212 ends 216 to the patch 222 includes beginning a top-down sewing process starting at about two inches below the top of a patch 222. In other words, the top of the connection area 224 begins at around two inches below the top of the patch 222. In some embodiments, such a sewing arrangement allows heat sealing and part of a heat fused joint between the patch 222 and bag fabric above the sewn attachment area 224. By heat sealing the patch 222 to the side wall or intermediate portion 38 of the bag 10, the joint of the lift loop is taken out of a peel position. By avoiding the peel position for the loop 212, improper handling conditions such as not maintaining the loops in a vertical position relative to the bag can be avoided.
In other embodiments a connection area 224 can start at or near a top edge 267 of patch 222, or at or about 1 inches downward from a top edge 267 of patch 222. In other embodiments a connection area 224 can start about 1 to 3 inches below or downward from a top edge 267.
Preferably ends 216 of lift loops or members 212 are spaced a distance away from side and bottom edges of a patch 222 as shown, for example, in
As discussed, preferably a lift loop assembly 210 is attached to a patch 222 rather than being attached directly to the bag fabric, e.g. at an intermediate or body portion 38 or other wall of a bag. More preferably, a patch 222 with a lift loop 212 securely sewn to it is attached to the side walls or body portion 38 of a bag 10 via heat seal or adhesive. Most preferably, a patch 222 and lift loop 212 combination preferably includes a heat seal portion connecting the patch to the bag that is at least about 1 inch above the sewn portion to protect the patch seal or joint from being put into a peel position if the bag is picked up by less than 4 loops, for example.
In various embodiments a patch 222 can be attached at or near a top edge of a bag body portion 38 or sidewall of a bag 10. In various embodiments a patch 222 can be attached to bag body portion 38 or sidewall of a bag 10 a distance below, or down from, a top edge of a bag intermediate or body portion 30, or a sidewall of a bag 10.
Loop impulse heat sealer machinery can be used in various embodiments of the method of the present invention, e.g., when heat sealing patch 222 with loops 212 coupled thereto to a bag 10. As previously discussed lift loops 212 can be sewn to a piece of fabric or patch 222, wherein this is the only sewing on an entire bag 10, and no stitch holes penetrate a containment area of bag 10. Alternatively loops 212 could be fused to a piece of fabric or patch 222 or to a bag 10 itself. Patch 222 can be sealed or heat fused to the bag 10 with a heat sealing bar, applying heat and pressure to a patch 222 that is positioned in a desired location over a bag 10, e.g., at in a desired location over body portion 38. Preferably a heat sealing bar provides a rocking motion when carrying out the heat sealing process to promote and even seal of patch 222 to the bag 10 fabric.
In some embodiments loops or lift members 212 can be configured so as to not be perfectly parallel. For example, wherein one lift leg or end 216 is not perfectly parallel to another lift leg or end 216 of the lift loop 212 when coupled to a patch 222. Also one lifting assembly 205 can be not perfectly parallel to another lifting assembly 205 on a bag 10.
Referring now to
Preferably when heat fusing a patch 222 to a bag 10, a patch 222 including a lift loop assembly 210 is folded at or near a center position 93 preferably at a location in between each end 216 of loop 212, and the center fold at 93 is preferably positioned on or near a corner area of bag 10 when bag 10 is in folded gusseted form, preferably like an envelope, at one or more folds 85 (see
Referring to
Depending on the type of bulk bag, in various embodiments less than 4 lift loop assemblies 205 can be attached to a bag 10. For example, some types of bulk bags are designed to have only 1 or 2 lift loops; thus, for those bags only 1 or 2 lift loop assemblies can be coupled to a bag as needed.
In embodiments wherein lift loops 212 are sewn to patches 222, with patches 222 heat fused to a polypropylene bag, the lifting assembly 205 is preferably in a shear position and can lift very heavy weights, e.g. about 500 to 5000 lbs of bulk material. In testing, the lift loops 212 secured in this manner to a bag 10 have been able to lift weights equivalent to that of an RV.
Referring now to
Referring now to
In some embodiments the discharge assembly 160 also includes a cover 154. Discharge spout 40 can be gathered or rolled toward the bottom of the bag 10. When rolled, the discharge spout 40 has a plurality of rolled layers 148 and forms a rolled discharge spout 140. To maintain a rolled position adjacent the bottom of the bag 10, a releasable discharge spout coupler 152 can be applied. In some embodiments, the discharge spout coupler 152 is an adhesive material, such as adhesive fabric tape, that can adhere to both rolled spout 140 and the bottom of the bag 10 to capture the rolled spout 140. Preferably the adhesive fabric tape is a polypropylene fabric with an adhesive that is not solvent based, and remains active. Other fabric tapes with an adhesive may also be used. The rolled spout 140 coupled to the bottom 39 provides a closed configuration of discharge tube 140, which prevents discharge of materials from the bag. The rolled layers can also help prevent unwanted sifting of materials from the bag.
In some embodiments a cover 154 is included as part of discharge assembly 160 and preferably is disposed across the rolled spout 140 that is coupled to the bottom 39 of the bag via tie or tape 152. Cover 154 can be attached to the bag 10 at couplings 162, 164. Couplings 162, 164 can attach the cover 154 at two sides of body, e.g. at two opposing sides. Preferably cover 154 is releasably attached to the bag 10. In some embodiments, the couplings 162, 164 include adhesives, while in other embodiments the couplings 162, 164 include heat fusion. In some embodiments, the pressure from the cover 154 helps maintain the rolled and tied spout 140 in position.
For discharge, if a cover 154 is part of discharge assembly 160, the cover 154 is first released from the bag. In some embodiments cover 154 can be released by peeling or detaching one or both couplings 162, 164. The rolled spout 140 can then be released by peeling or detaching the tie or tape 152 coupled across the spout 140. In this manner, an operator's hand is away from any material flow. An operator preferably can access both the cover 154 and the tie or tape 152 while positioned beside the bag and not standing under the bag. As the tie 152 is peeled or detached, the rolled layers 148 of rolled spout 140 automatically unrolls wherein materials flow easily from the bag 10. Preferably peeling or detaching tie 152 causes the rolled layers 148 to unroll and changes the closed configuration of the discharge tube to an open configuration. Preferably no knots are used in the discharge assembly 160, thus no knots need to be untied. Consequently, the discharge assembly 160 of the bag 10 can also be called knot-free.
Reference is made to co-pending U.S. patent application Ser. No. 15/345,452, filed on 7 Nov. 2016, which is hereby incorporated herein by reference, for further details on discharge assemblies 60, 160, and a cover 154.
It should be understood that a lifting assembly 205, including a lift loop assembly 210 and bag connection assembly 220, can be used with any bulk bag disclosed herein or with various types of prior art bulk bags or bulk bags to be developed in the future.
Referring to
The above discussion is meant to be illustrative of the principles and various embodiments of the present disclosure. While certain embodiments have been shown and described, modifications thereof can be made by one skilled in the art without departing from the spirit and teachings of the disclosure. The embodiments described herein are exemplary only, and are not limiting. Accordingly, the scope of protection is not limited by the description set out above, but is only limited by the claims, that scope including all equivalents of the subject matter of the claims.
The following is a list of parts and materials suitable for use in the present invention:
All measurements disclosed herein are at standard temperature and pressure, at sea level on Earth, unless indicated otherwise. All materials used or intended to be used in a human being are biocompatible, unless indicated otherwise.
The foregoing embodiments are presented by way of example only; the scope of the present invention is to be limited only by the claims.
Priority to and/or the benefit of U.S. Provisional Patent Application Ser. No. 62/269,087, filed 17 Dec. 2015, which is hereby incorporated herein by reference, is hereby claimed. Priority to and/or the benefit of U.S. Provisional Patent Application Ser. No. 62/419,317, filed 8 Nov. 2016, which is hereby incorporated herein by reference, is hereby claimed. This application is related to U.S. patent application Ser. No. 15/345,452, filed on 7 Nov. 2016, which claims the benefit of and/or priority to U.S. Provisional Patent Application Ser. No. 62/252,270, filed on Nov. 6, 2015 and U.S. Provisional Patent Application Ser. No. 62/269,087, filed 17 Dec. 2015, each of which is hereby incorporated herein by reference.
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