MX2013002852A

MX2013002852A - Method and system for folding and sealing bags.

Info

Publication number: MX2013002852A
Application number: MX2013002852A
Authority: MX
Inventors: Gary Sargin
Original assignee: Coating Excellence Int Llc
Priority date: 2010-09-14
Filing date: 2011-09-12
Publication date: 2013-06-28
Also published as: EP2616349A1; MX343192B; EP2616349B1; CA2809635C; US20140090339A1; US20110019944A1; EP2616349A4; WO2012037012A1; CA2809635A1

Abstract

A system including multiple bags each having a first adhesive material on a first panel, and second adhesive material on a stepped construction of the bag, and a third section of each bag being free of adhesive, further including a hot air manifold along which the bag is conveyed after the bag has been filled with contents and closed, which heats the first adhesive material and the second adhesive material to their adhesive states; a section of the hot air manifold along which the third section free of adhesive is conveyed, which minimizes adhesive contamination; a blade to bias the stepped construction of the bag to follow along the manifold; and a trailing end of the blade to fold the bag along its third section without displacing or expelling adhesive from the third section, which minimizes adhesive contamination of surfaces of the bag.

Description

METHOD AND SYSTEM FOR FOLDING AND SEALING BAGS FIELD OF THE INVENTION This invention relates to a method and system for folding and sealing polymer bags.

This invention relates to polymer bags made by the method and system for folding and sealing polymer bags.

BACKGROUND OF THE INVENTION The application US 2010/0154362 A1 discloses a method for closing and sealing bags, wherein each bag after filling with contents is transferred together with an air manifold which applies hot air under pressure to heat a layer of adhesive on a first panel of the bag and to heat a layer of adhesive on a second panel of the bag. Each of the adhesive layers is heated to an adhesive state at a temperature below the temperature of the softening point of the polymeric material of the bag. The bag is then folded to contact the adhesive layers with each other, and the adhesive layers form an adhesive-to-adhesive seal upon application of pressure. The adhesive material can be transferred to the hot air collector and associated mechanisms, causing contamination of the equipment. It would be desirable for the bags to have the adhesive material located in positions that will minimize the transfer of the adhesive material to the hot air manifold and associated mechanisms.

The application US 2010/0158418 A1 discloses a bag made from a polymeric woven tube. One end of the tube is closed and then sealed by being moved next to a hot air manifold that applies hot air under pressure to heat a layer of adhesive on a first panel of the tube and to heat a layer of adhesive on a second panel of the tube . Each of the adhesive layers is heated to an adhesive state at a temperature below the temperature of the softening point of the polymeric material of the tube. Then the tube is folded to contact the adhesive layers with each other and form an adhesive to adhesive seal. It would be desirable to fold the tube without displacing or expelling adhesive from the fold, in order to minimize contamination by adhesive on tube surfaces.

BRIEF DESCRIPTION OF THE INVENTION The invention relates to a bag to be filled with contents, the bag includes a polymeric tube having a first panel, a second panel and lateral wrinkles, and the first panel has a first section and a second section. One end of the tube has a stepped construction, which includes the second section, and portions of the lateral wrinkles extend beyond the second section and a portion of the second section. second panel extends beyond the lateral wrinkles. A first adhesive material on the first section and the second adhesive material on the stepped construction achieves adhesive states by heating at a temperature below the temperature of the softening point of the polymeric material. The tube has a third section between the first section and the second section. The first adhesive material and the second adhesive material are absent from the third section where the third section is free of adhesive. The end of the tube is closed. The tube is folded together with the third section without displacing or expelling adhesive from the third section in order to minimize contamination by adhesive on the surfaces of the tube, and the adhesive material on the stepped construction and the adhesive material on the first section is in contact and under pressure below the third section and provides a seal of adhesive to adhesive on the end of the bag.

Another embodiment of the invention relates to a bag constructed of polymeric material and adapted to be closed and sealed after having been filled with contents. The bag includes a first panel, a second panel and side wrinkles, the first panel having a first section and a second section. The bag has a closed end. One end of the bag through which the bag is to be filled with content has a stepped construction, which includes the second section, portions of the lateral wrinkles that extend beyond the second section and a portion of the second panel extends beyond the portions of the lateral wrinkles. A first adhesive material on the first section and the second adhesive material on the stepped construction achieves adhesive states by heating at a temperature below the temperature of the softening point of the polymeric material. The first panel has a third section between the first section and the second section. The first adhesive material and the second adhesive material are absent from the third section, where the third section is free of adhesive. The end of the bag can be closed and the bag foldable along the third section without displacing or expelling adhesive from the third section in order to minimize contamination by adhesive on the surfaces of the tube, and the adhesive material on the construction Step and the adhesive material on the first section are in contact and under pressure below the third section and provide a seal of adhesive to adhesive on the end of the bag.

Another embodiment of the invention relates to a method for closing and sealing an end of a bag taken from multiple bags each made of polymeric material. The bag has a first adhesive material on a first section of a first panel, and has a second adhesive material on a stepped construction, which includes a second section of the first panel, portions of the lateral wrinkles extending beyond the first panel and a portion of a second panel extending beyond the lateral wrinkles. In addition, the method includes heating the first adhesive material and the second adhesive material to their adhesive states, while the bag is moved along a hot air trap after the bag has been filled with the contents, and the Bag has been closed and wrinkled. The first adhesive material and the second adhesive material are absent from a first edition of the first panel, wherein the third section is free of adhesive. The method includes moving the third adhesive-free section along a section of the hot air manifold, which minimizes contamination by adhesive. In addition, the method includes folding the bag along the third section without displacing or expelling adhesive from the third section, which minimizes adhesive contamination of the tube surfaces, and apply pressure to contact the first adhesive material and the second adhesive material and form a seal from adhesive to adhesive, which seals the end of the bag through which the bag has been filled with content.

BRIEF DESCRIPTION OF THE DRAWINGS Preferred embodiments of the invention will now be described, by way of example with reference to the accompanying drawings.

Figure 1 is an isometric view of a modality of a tube of polymer material to be made inside a bag.

Figure 2 is an isometric view of another embodiment of a tube of polymer material to be made inside a bag.

Figure 3 is an isometric view of a bag made from a tube of either of Figure 1 or Figure 2.

Figure 4 is a schematic view of a portion of a hot air sealing apparatus and a polymeric woven bag translated from left to right as seen in the figure.

Fig. 5 is a schematic view of a wrinkling apparatus of the hot air sealing apparatus of Fig. 4. Further, Fig. 5 discloses a folding section of the hot air sealing apparatus of Fig. 4.

Figure 6 is a schematic view of the hot air manifold of Figure 7 in the folding section of Figure 5.

Figure 7 is an isometric view of a hot air manifold that will be incorporated in the folding section of Figure 5.

Figure 8 is a top plan view of the hot air manifold of Figure 7.

Figure 9 is a view of a rear wall of the hot air manifold of Figure 7.

Figure 10 is a cross section along the line 10-10 of Figure 8.

Figure 11 is a schematic view of a compression cooling and closing apparatus of the hot air sealing apparatus of Figure 4.

DETAILED DESCRIPTION OF THE INVENTION The bags that will be used for the bulk packaging of granular or finely ground materials, such as nutrients including, but not limited to, whole and ground grains, seeds, dry pet food, chemical fertilizers, other bulk foods and non-food products , and treatments for growing plants, must be durable to withstand material degradation, abrasion, perforation, contamination and leakage of contents, and must withstand a leak test while sealing and filling with a content weighing up to approximately 50 pounds, and even up to approximately 80 pounds. In addition, such bags are generally discarded after use, which requires an economical and lightweight construction that is environmentally friendly, can be recyclable, and reduces wear and tear in the supply chain from production, use of the bag , up to disposal in either a recycling stream or a waste dump.

Currently, multilayer paper and polymer layer bags, consisting of multiple layers of paper and polymer film layers, are heavy, expensive to produce and transport, easy to tear and drill, and create waste in the supply chain . Multilayer paper bags / polymer layers, traditionally used to pack bulk products, are not recyclable and add significant amounts of materials to waste dumps. This invention overcomes many important disadvantages of multi-layer paper bags / polymer layers by offering a lighter weight bag that is less expensive, more durable and tear resistant, resulting in significantly reduced waste in the supply chain, and It is 100% recyclable in an adequate recycling stream. In addition, this invention can operate in essentially the same way on existing filling and sealing equipment to perfect a compression-sealed bag filled with product.

A common manufacturing production line provides an apparatus for filling the bags with content, and also provides an apparatus for closing the bag in a simple way when closing by compression, and also provides the equipment to seal the bag closed by compression. Traditionally constructed bags can be closed when sewn or alternatively, sealed with a heat-fusible sealant instead of sewn. Such traditional construction bags include multilayer bags made of paper and polymer film laminates. The bag construction should allow the bag to be quickly filled with content and in the future should allow the bag to be closed and sealed.

The traditional bag construction has layers of polymer laminate with a layer or layers of paper. The sealing of traditional bags after filling is achieved by remelting a hot melt adhesive and / or meltable polymer layer at an elevated temperature while the paper resists damage to the construction of the bag. The high flash point inherent to the paper lies in supporting the application of heat at a high temperature and thus protecting the bag from damage due to heat and temperature. Additionally, a thin layer of polyethylene polymer, PE, on the paper surface can be melted or softened together with the hot melt adhesive to adhere to the paper and form a secure seal. The existing end-user production line system applies hot air over the bag to melt and activate the hot melt adhesive and / or meltable polymer layer, after the filling operation of the bag. The heat must be applied at a temperature that melts the hot-melt adhesive, and in addition, to at least partially melt the polymer layer on the paper surface, while relying on the paper to withstand heat and temperature, and to prevent The bag softens or burns due to heat and temperature. However, a very important disadvantage of multilayer paper and polymeric laminates is that they are composite materials that are not capable of being recycled either as paper or as plastic as a classification of a single material. In addition, the multilayer laminates of the traditional bag are not compostable, and consequently they remain in one piece in waste dumps. In addition, multi-layered laminates are heavy and add unnecessary transport costs.

In an end-user manufacturing production line, the apparatus is provided for filling the bags with contents through an open end of the bag, followed by closing and sealing the filled bag. Traditional production lines have used suture equipment to sew the joint of the bag. Alternative production lines heat air jets to apply heat at an elevated temperature to melt and activate the pre-applied thermo fusible adhesives that were previously applied to the traditional thick film and polymer film laminate paper bags. Hereafter, a closing mechanism closes the bags in an advantageous manner simply by closing the open ends by compression. The closing mechanism applies pressure on the bags to close and keep the bags closed while the hot melt adhesive adheres to the closed bag and until the adhesive cools and hardens.

The heat must be applied at a temperature that melts the hot-melt adhesive, and in addition, which can melt the portions of the polymer layer on the paper surface, while relying on the paper to withstand heat and temperature, and for prevent the bag from softening or burning due to heat and temperature. Traditional bags have a thick multilayer paper construction and polymer film laminates. One or more thick layers of paper from traditional bags withstand heat applied at high temperatures without weakening the strength of the bag and without burning the paper. In addition, a layer of polyethylene laminated film, PE, on the paper surface partially melts while in contact with the molten thermo fusible adhesive to form a thermal seal with the adhesive.

The embodiments of the invention provide a sustainable solution to the existing need for bags that replace traditional paper bags of multilayer and polymeric laminates, and can even withstand the application of heat and temperature to seal bags, which remain common and current in the existing production equipment.

Consequently, there has been an existing need for a bag made of structural components capable of being recycled or resulting in less waste dump material compared to traditional bags, and capable of being sealed by existing production equipment to avoid costly replacement of the existing production line equipment. Accordingly, to replace the existing structural components of a laminated paper and polymer bag with an improved bag, the improved bag must be hot sealed by existing production equipment that resists the application of heat and / or pressure to melt the adhesive and seal the bag. Furthermore, there is a need to remove a laminate of paper and polymer as one of the structural components of the bag, which is unable to be recycled and / or degraded in a waste landfill, and which adds significantly greater weight and quantities of materials in a waste dump.

The traditional multilayer paper and polymer laminate bags have approximately 275 grams of paper and 50 grams of polypropylene polymer and a carbon footprint of approximately 1 1 as a measure of carbon emissions. The lighter weight bags of approximately 150 grams result from the embodiments of the invention with fewer raw materials than those used in making the traditional bags, and result in a substantially reduced carbon footprint of about 5.

According to the embodiments of the invention, the woven bags are completely made of a recyclable polypropylene and with structural components that include a tubular woven bag (mesh) laminated on the inside of a non-porous polymer film of a single layer or layers. laminated The bags are made entirely of a recyclable polypropylene material that is recyclable and can be compostable because it has resin additives such as metallocene, and which is also free of recycled or contaminated polymers of unknown chemistry and mixtures of unknown materials. In addition, the bags according to the embodiments of the invention are less heavy and are more resistant to abrasion, tear and perforation and are reusable compared to multi-layer paper and polymer laminates which are susceptible to abrasion and damage. The bags according to the embodiments of the invention reduce the waste due to transport costs, the content of the damaged bags and the increased shelf life of the contents.

The embodiments of the invention satisfy an existing need for sturdy, lighter-weight bags that have structural components that eliminate traditional laminates from non-recyclable paper-polymer., and in addition, that are durable for reuse, and are degradable by composting in a waste dump and are recyclable as a single material. In addition, recyclable and / or compostable bags include water-soluble adhesive materials as structural components of the bags. The modalities of the adhesive materials can be applied previously while they are non-toxic solvents, soluble in water. The adhesive materials are applied on opposite surfaces of the bags, followed by curing by exposure to radiant or trapped heat, an electron beam, EB, radiation, air or other curing medium and / or to evaporate the dispersion not toxic for the environmentally safe disposal of the activatable adhesive components of the dispersion mixture which achieve a hardened non-adhesive state, which is not reactive to water or moisture, and is not toxic to incidental contact with the nutrients with which the bags An opposite end of each of the bags has a compression bottom configuration or alternatively, a flat bottom configuration which is closed and sealed by seams, or by an adhesive preferably a non-toxic adhesive or by a plastic weld or by a material that includes, but is not limited to, a polymeric material, paper or non-woven tape. The bags are folded flat for shipment to another manufacturing facility where the bags are filled with contents and sealed and sealed.

The adhesive materials for sealing the bag are activatable to a molten adhesive state using the existing production line equipment which applies heat at a temperature sufficiently below the temperature of the softening point Tg of the polymeric structural components of the bag, and for melt the adhesive materials to an adhesive state without damaging the other structural components of the bag.

While a traditional multilayer / polymer layer bag can be sealed with a melt-fused thermofusible adhesive, these thermofusible adhesives are not suitable for sealing polymeric bags, which are commonly comprised of one or more recyclable polypropylene polymer layers, or a woven bag of recyclable and / or compostable polypropylene and an outer or laminated polymeric layer of two or more polymeric layers of recyclable polypropylene or other polymeric material, but not including either paper or an outer layer, which can not be hot sealed in manufacturing equipment for traditional bags. The heat required to activate a hot melt adhesive to an adhesive state would be detrimental to a woven polymer bag and destroy the structural integrity of the bag. A traditional multilayer paper / polymer layer bag can be sealed with a hot melt adhesive, while in a polymer bag the heat applied by the existing end user equipment to reactivate or remelter a thermo fusible adhesive would additionally heat the Polymeric material of the bag above its Tg softening point temperature causing the polymeric material to soften, lose tensile strength or even suffer plastic deformation. Accordingly, commonly known thermo fusible adhesives are not suitable for forming a seal on a polymer bag.

The hot-melt adhesive is reactivated by a stream of hot air coming from a hot-air sealing equipment. The equipment is designed to blow hot air only over the 3.81 cm width of the pre-applied adhesive to leave the adhesive in a thermo-activated adhesive state. The common hot spots in a hot-air sealing equipment for multi-walled paper bags generally exceed 204.44 ° C. However, woven polypropylene bags will deform to approximately 148.89 ° C. There is a need to modify the equipment to seal polymeric bags woven at a reduced heat activation temperature. During the development of a compression bottom cover for woven polymeric bags, it is clear that the hot air sealing equipment that commonly seals the multilayer paper bags needed to be modified.

Each of Figures 1 and 2 discloses an alternative embodiment of a bag 100 formed from a polymeric tube, which includes an outer layer 104 having a polymeric film alone or a laminate of polymeric films, and a layer of polymeric woven bag interior 102. The tube is formed with a first panel 106, a second panel 108 and an open end 122 of the bag which is closed by compression by compressing the first panel 106 and the second panel 108 against each other at its edges. end adjacent the open end 122. A portion of the woven bag layer 02 is illustrated with a woven appearance.

The polymeric woven bag 100 has a stepped or layered construction at the open end 122, wherein a portion of the first panel 106 is removed by sectioning, cutting or heat cutting, and wherein the first panel 106 is made shorter than a longer portion 502 of the second panel 108 at the open end. The longer portion 502 provides a collapsible flap portion 502 in the second panel 108. In addition, the inner woven layer 102 of the collapsible flap portion 502 is exposed. The first panel 106 and the second panel 108 are joined along their side edges along the sides 1 10 of the bag 100.

In addition, in Figures 1 and 2, the bag 100 has sides 100 in the form of lateral wrinkles 1 10. Folds or longitudinal end wrinkles are attached to the lateral wrinkles 1 10 with the first panel 106. Folds or end wrinkles longitudinals 1 14 are joined to the lateral reinforcements 1 10 with the second panel 108. The longitudinal folds or wrinkles 116 between the first folding portions 1 18 and the second collapsible portions 120 of the respective lateral wrinkles 1 10. The panels 106, 108 are joined by their lateral edges and by their end edges by plastic welding of the edges or by means of an adhesive. Alternatively the bag 100 is tubular and the panels 106, 108 are defined by making folds or wrinkles in the bag 100. The stepped construction, or layered construction, exposes the respective lateral wrinkles 1 10, where each of the lateral wrinkles 10 includes a first wrinkle portion 118 attached to the first panel 106 and a second wrinkle portion 120 attached to the second panel 108.

In Figure 1, the first wrinkle portion 1 18 and the second wrinkle portion 120 extend to different lengths beyond a second panel section 204. The first wrinkle portion 1 18 extends beyond the second section 204. The second wrinkle portion 120 extends beyond the first wrinkle portion 1 18. In Figure 2, the first wrinkle portion 1 18 and the second wrinkle section 120 extend the same length beyond the second. Panel section 204.

In Figures 1 and 2, a structural component of the first panel 106 includes a first adhesive layer 600 applied over the first section 202 of the first panel 106. A structural component of the second panel 108 includes a second or additional adhesive layer 602 over a portion of the second panel 108. In addition, the second adhesive layer 602 is on the second section 204 of the first panel 106, and on the exposed portions 1 18, 120 of the lateral wrinkles 1 10 exposed by the stepped or layered construction. The adhesive layers 600, 602 are dried to a stable, non-adhesive solid by passing through a heated oven or by directing air heated and blown by a fan over the adhesive layers. According to one embodiment of the invention, the adhesive layer 600 and the adhesive layer 602 are applied simultaneously. According to another embodiment of the invention, the adhesive layer 600 and the additional adhesive layer 602 they can be of the same material applied simultaneously on the bag 100 or, alternatively, applied separately.

An end 122 of the bag is open, through which the contents can be introduced into the bag 100. After filling the bag with the contents, the end 122 is adapted to be closed by compression between the end edges of the first panel. 106 and the second panel 108. An opposite end 124 of the bag 100 is closed when sewn, glued with adhesive tape, gummed or welded with plastic. Advantageously, the bag 100 is made entirely of compostable polypropylene, PP.

The bag 100 is foldable along a fold line 206 extending through the bag 100, wherein the fold line 206 extends through the first panel 106 between a first panel section 202 adjacent a second section. of panel 204. Bag 100 is foldable without wrinkling, or alternatively foldable along a crease formed along fold line 206 by a wrinkling apparatus.

An adhesive-to-adhesive seal is formed by the application of heat to activate the adhesive layers 600, 602 (Figure 3) toward adhesive states, which reach adhesive states by heating to a temperature below the temperature of the softening point of the polymeric material . In Figure 3, the bag 100 is foldable along the fold line 206 to fold the first panel 106 on itself and to urge the adhesive layer 602 to come in contact with the adhesive layer 600 below the line fold 206 and form an adhesive to adhesive seal. The sealing flap portion 502 is folded over the second panel section 204 of the panel 106 to hold the bag 100 in a folded configuration. Preferably, the adhesive layers 600, 602 are of the same width, or of the same height relative to the height of the bag, to form an adhesive-to-adhesive seal of the same width.

Another embodiment of the bag 100 has the end 122 closed and sealed, as illustrated in Figure 3, to form a bottom of a bag 100, while the opposite end 124 is an open end through which the bag will be filled with the content. The bag 100 is made from a polymeric tube, wherein the opposite end 124 is an open end of the polymeric tube. The opposite end 124 has the same construction as a previously described 122 end modality such that the opposite end 124 can be closed and sealed after filling the bag with the contents.

Then, the modalities of the bag 100 are prepared for storage and shipment. The end 122 of the bag 100 is closed by compression by closing the first panel 106 and the second panel 108 against each other at their end edges adjacent to the open end 122. The end 122 of the bag 100 is folded flat while remains unsealed and bag 100 is folded flat for storage and shipping to another manufacturing plant where end 122 of bag 00 is opened, bag 100 deploys and expands from the flat configuration, and the bag It is filled with content. Then, the end 122 is closed and sealed. Each of the adhesive layers is heated to an adhesive state at a temperature below the temperature of the softening point of the polymeric material of the bag. The bag is then folded to contact the adhesive layers with each other, and the adhesive layers form an adhesive-to-adhesive seal upon application of pressure. It would be desirable to fold the tube without displacing or expelling adhesive from the fold, in order to minimize contamination by adhesive on tube surfaces. Accordingly, the first panel 106 of the polymeric tube has a third section 208 between the first section 202 and the second section 204. The tube is folded along the third section 208, wherein the adhesive material 602 in the stepped construction and the adhesive material 600 in the first section 106 are in contact and under pressure below the third section 208 and provide an adhesive-to-adhesive seal at a closed end of the bag 100.

The first adhesive material 600 and the second adhesive material 602 are absent from the third section 208, where the third section 208 between the first section 202 and the second section 204 is free of adhesive. As a result, the tube is folded and pressure is applied, without displacing or expelling adhesive from the third section 208, in order to minimize contamination by adhesive on the surfaces of the tube.

The development of a lower compression closure in woven polymeric (polypropylene) bags revealed that the polypropylene materials from which the bag was made could not withstand the heat needed to reactivate a hot melt by means of typical hot air sealants. . Theoretically, melts could be used, but they would need sealing equipment with much more time in order to 1) operate at much lower air temperatures, and 2) give the bag more time to seal with reduced heat .

To seal a multilayer paper bag, its flap portion or sealing flap is covered with a width of 3.81 cm (1.5 inches) of hot melt adhesive. After filling the bag with the contents, the adhesive is heated to an adhesive state and the sealing flap is folded to adhere the adhesive against an adjacent width 3.81 centimeters (1.5 inches) from the bag. A typical hot air sealing apparatus (apparatus) heats the hot melt adhesive to its melting temperature, while the paper materials in the bag resist the hot melt temperature without heat damage. A compression closure of the sealing equipment folds the sealing flap and compresses the bag to seal the sealing flap against the bag while the adhesive cures and dries. However, a typical hot air sealing equipment produces hot melt temperatures that could cause heat damage to the woven polymeric (polypropylene) bags disclosed herein.

One embodiment of the invention provides a polymeric (polypropylene) bag 100 woven with a compression closure without requiring significant new equipment to seal the bags. The adhesives 600, 602 disclosed herein to seal the polymeric (polypropylene) bags 100 will be reactivated to an adhesive state at much lower temperatures than the higher hot melt temperatures required to melt a hot melt adhesive, and will do so within the current residence times provided by typical hot air sealing equipment. One problem was that the lower temperature hot melt adhesives disclosed herein provide an adhesive to adhesive seal, while the sealing flap 502 is folded against the panel section 204. The adhesive to adhesive seal requires adhesive coatings 600, 602 over a wide area through the polymeric bags 100. More specifically, a full width of 7.62 centimeters (3 inches) of adhesive coatings 600, 602 is needed, which solves a problem for the typical hot air sealing equipment. The typical hot air sealing equipment is capable of heating a width of 3.81 centimeters (1.5 inches) of thermo fusible adhesive over a sealing flap of a multilayer paper bag. However, hot air distribution is required for an area of 7.62 centimeters (3 inches) in width through the woven polymer bag 100. For this reason, the hot air sealing equipment is modified by an air distributor to distribute the hot air to where it is needed over an area with a width of 7.62 centimeters (3 inches) through the 100 woven polymer bag. Modification provides a capability of the same hot air sealing equipment to seal both multi-layer paper bags and 100 woven polymer bags in the same equipment.

The modification is capable of heating the adhesive material that has a dimension of up to 3.81 cm (1.5 inches) in width over the first section of the first panel, and of heating the adhesive material to its adhesive state while having a dimension up to 3.81 cm (1.5 inches) in width over the stepped construction of the bag.

Figure 4 discloses a system that performs a method for closing and sealing one end of the bag taken from multiple bags each made of polymeric material. Figure 4 discloses a portion of a compression seal unit 400 or hot air sealing apparatus 400 and a woven polymer bag 100 translated from right to left as seen in the figure. The apparatus 400 has a stationary guide plate 402 against which the bag 100 is supported. The stationary guide plate 402 has a vertical orientation.

Figure 5 discloses a wrinkling apparatus 500 of the hot air sealing apparatus 400. The bag 100 is moved past a rotating wrinkling wheel 504. A circumference of the wrinkling wheel 504 rolls on the bag 100 for compression closure the end of the bag 122 while the end of the bag 122 is moved between the wrinkling wheel 504 and the guiding plate 402, Figure 4. The wrinkling wheel 504 has a circumferential rim flange that projects to press against the line of fold 206, as illustrated in Figure 3, of bag 100, and to crease bag 100 along its fold line 206. Wrinkled bag 100 is folded along fold line 206, which pivots on flap portion 502 and section 202 of panel 106 along fold line 206.

In Figure 5, after passing the wrinkling wheel, the stepped construction of the bag 100 enters a folding apparatus 600 of the hot air sealing apparatus 400. The stepped construction of the bag 100 first passes under a leading edge that diagonally opens 604 of a fold sheet 606. The fold sheet 606 is formed longitudinally along a sloped stationary sheet, such that the inclined stationary blade extends behind the stepped construction of the flap portion 502 and the section 202 of the panel 106. The opening leading edge 604 guides the stepped construction of the flap portion 502 and the section 202 of the panel 106 under the fold sheet 606. With reference to Figure 6, the stepped construction of the flap portion 502 and the section 202 of the panel 106 continues to pass under and against the fold sheet 606. The fold sheet 606 it extends backwardly from its opening leading edge 604 and progressively arcs down its length until it is parallel to an upper wall 702, which is illustrated in FIG. f6, of a hot air manifold 700.

Adhesive layer 602 is heated to an adhesive state by blowing hot air through an upper wall 702 of hot air manifold 700, which is illustrated in Figure 7. Adhesive layer 600 is heated with hot blown air through a back wall 704 of the hot air chamber 716. For example, the adhesive layer 602 on the flap portion 502 and the section 202 of the panel 106 of the bag 100 is approximately 3.81 cm wide and extends to through the bag 100. Similarly, the adhesive layer 602 is approximately 3.81 cm (1.5 inches) wide and extends through the bag 100.

Fig. 7 illustrates the hot air manifold 700 of the hot air sealing apparatus 400 having a hollow hot air chamber 716, which is illustrated in Figs. 8, 9 and 10. The hot air chamber 716 is provided with the upper wall 702, rear wall 704, a bottom wall 706 in figure 9, a front wall 710 in the figure and end walls 712, 714, for example, made by stamping and forming individual parts and when welding or hardening parts together to form the hot air chamber 716. An inlet 718 is provided to the hot air chamber 716 through the front wall 710. Pressurized hot air is supplied through the inlet 718 to pressurize the hollow chamber 716 .

Figures 7 and 8 show that the upper wall 702 is perforated with a distribution of air passages 720 that blow hot air over the adhesive layer 602 in the flap portion 502 and in the adhesive layer 600 in the panel section 202 106. The rear wall 704 is perforated with a distribution of the air passages 722 which blow hot air over the adhesive layer 600 in the panel section 204 of the bag 100. The rear wall 704 has a flared leading edge 724 for guiding the panel section 204 beyond the leading edge 724.

Figure 6 illustrates the hot air manifold 700 in the hot air sealing apparatus 400. In addition, Figure 6 illustrates a thinned entrainer end 732 of the hot air chamber 716. The hot air chamber 716 is tapered inwardly. at 732a along the front wall 710, as illustrated in FIGS. 8 and 11, toward the drag end 732. The hot air chamber 716 is tapered down at 732b, as illustrated in FIGS. 1 1, along the upper wall 702 towards the pulling end 732. In Fig. 1 1, hot air is supplied to the hot air chamber 116 via a hot air duct 720 connected to the inlet 718.

In Figure 6, the bag 100 has the flap portion 502 and the panel section 202 moves from right to left on the upper wall 702 of the hot air chamber 716, while hot air is blown under pressure from the chamber hot air through the passages 720 through the upper wall 702 and on the adhesive layer 602 in the flap portion 502 and on the adhesive layer 600 in the panel section 202. The adhesive layers 600 are heated , 602 to adhesive states with the hot air, and then pass to a pulling end 732 of the hot air chamber 716.

According to one embodiment of the invention, steps 722 are added to the rear wall 704 such that hot air under pressure is blown from the hot air chamber 1 6 through the passages 722 through the rear wall 704 and on the adhesive layer 600 that is illustrated in Figures 2 and 3, on the panel section 204 that is illustrated in Figure 3. The adhesive layers 600 are heated to an adhesive state with the hot air and then passes a drag end 732 of the hot air chamber 716.

The adhesive material can be transferred to the distributor of hot air and associated mechanisms, causing contamination of the equipment. To minimize equipment contaminationFigure 9 shows that the upper wall 702 is hollowed down from the upper edge margin 726 to define a recess 730 along the upper wall 702 to separate the adhesive layers 600, 602 from the upper wall 702 and prevent contact between while the adhesive layers 600, 602 are heated to their adhesive states. In addition, the rear wall 704, which is illustrated in Figure 10, has edge margins projected outwardly and along 726, 728 which are formed by arcing. The projected edge margins 726, 728 form a cavity along 730 which is illustrated in FIG. 10, where the projected edge margins 726, 728 separate the adhesive layer 600 on the panel section 204 of the back wall 704 to avoid contact between them while the adhesive layers 600, 602 are heated to their adhesive states.

Furthermore, it would be desirable for the bags 100 that the adhesive material of the adhesive layers 600, 602 be located in poons that minimize the transfer of adhesive material to the hot air manifold 700 and associated mechanisms. Accordingly, in the bag 100, the first adhesive material 600 and the second adhesive material 602 are absent from the third section 208, wherein the third section 208 between the first section 202 and the second section 204 is free of adhesive. As a result, the tube is folded and pressure is applied, without displacing or expelling adhesive from the third section 208, in order to minimize adhesive contamination of the hot air manifold 700 and associated mechanisms. In addition, the third section 208 of the first panel 106 is moved along a section 726 of the hot air distributor 700 between the rear wall 704 and the top wall 716, wherein the contact between the third section 208 and the air distributor Hot 700 is absent of adhesive material, which minimizes adhesive contamination.

The hot air sealing apparatus 400 is adapted to close by compression and seal a multilayer paper bag, not shown, having a thermo fusible adhesive. The hot air distributor 700 is also capable of heating the hot melt adhesive to a hot melting temperature by adjusting to the temperature at which the hot air is heated in the hot air chamber 716. The multi-layer paper bag It can resist the hot melting temperature. However, the bag 100 of polymeric material can not withstand the hot melting temperature. Accordingly, the temperature at which the hot air is heated in the hot air chamber 116 should be adjusted below the melting temperatures or the softening point temperatures of the polymeric materials that are used in making the bag 100 In addition, a multilayer paper bag, not shown, having a layer of thermo fusible adhesive approximately 3.81 centimeters wide on the bag can be heated with hot air blown through the upper wall 702. However, the multilayer paper bag does not have additional adhesive to form an adhesive to adhesive seal. For this reason, hot air blown through the rear wall 704 of the hot air chamber 716 collides harmlessly against the multi-walled paper bag, in which the paper material of the multi-walled paper bag resists the Hot melt hot air.

Figure 6 illustrates that the fold sheet 606 is biased against the bag 100 to hold the flap portion 502 and the section 202 of the panel 106 downward toward the top wall 702 according to the flap portion 502 and the section 202 of the panel 106 they move from right to left. On the other hand, the folding sheet 606 has a pulling end 606a that extends beyond the driving end 732 of the hot air chamber 716. The folding sheet 606 progressively arcs along its pulling end 606a until its trailing end 606a remains essentially vertical beyond the trailing end 732 of the hot air chamber 716. The folding sheet 606 progressively arches predisposing the flap portion 502 and the section 202 of the panel 106 progressively downward to follow the thinned upper wall 732b of the hot air chamber 716. Beyond the trailing end 732 of the hot air chamber 716, the trailing end 606a of the fold sheet 606 predisposes the flap portion 502 and the section 202 of the panel 106 in an essentially vertical manner. In addition, the end of Drag 606a of fold sheet 606 predisposes flap portion 502 to fold, as shown in Figures 2 and 3, along fold line 206 of Figure 3, while the adhesive layer 600 in the panel section 202 has been heated to an adhesive state and is predisposed to attract the heated adhesive layer 600, which is illustrated in FIGS. 2 and 3, on the panel section 204 of FIG. the bag 100, which has been heated to an adhesive state. The folded panel section 202 and the folded flap portion 502 emerge from the trailing end 606a of the folding sheet 606, while the bag 100 continues to be translated from right to left.

Figure 1 1 shows a compression closure apparatus 1200 of the hot air sealing apparatus 400. A pair of roller driven belt drives 1202, 1204 are compressed on opposite sides of the folded bag 100 to close by compression the bag 100, and further, to secure the second panel 108 of the bag 100 against the first panel 106 of the bag and form an adhesive to adhesive seal by contact between the first adhesive layer and the second adhesive layer 602. Belt drives 1202, 1202 apply clamping pressure transferred to the adhesive layers 600, while cooling to room temperature and forming solidified sealed states, to form an adhesive to adhesive seal.

In Fig. 11, the roller driven belt drives 1202, 1204 can overlap the pull end 606a of the fold sheet to pull the folded bag 100 out of the fold sheet 606. The belt driven drives with rollers 1202, 1204 apply continuous clamping pressure in the bag 100 as they move the bag 100 from the trailing end 606a of the folding sheet 606. After exiting the band drive mechanisms 1202, 1204, the bag 100 can be clamped. to continue with the clamping pressure applied on opposite sides of the folded bag 100, along the folded section 202, to apply clamping pressure against the adhesive layers 600, 602 so that they adhere to each other, while they cool to room temperature and form solidified sealed states.

An adhesive material was required to be developed to provide a first adhesive layer 600 of the thermo-activated adhesive material in a portion of the bag 100. The same or another adhesive material was to be developed to provide a second layer of adhesive 602 of activated adhesive material. by heat in another portion of the bag 100, wherein the heat activation temperatures of the first adhesive layer 600 and the second adhesive layer 602 are below the softening point temperature of the polymeric material of the bag 100 and wherein the adhesive adhesive layer 600 can be urged upon contact with the adhesive layer 602 and form an adhesive seal with adhesive to close and seal the bag 100 at its end 122. The sealing advantageously was carried out using the equipment of end-user production line for applying heat with controlled temperature to activate adhesive layers 600, 602 to adhesive states. A soluble adhesive was developed, wherein the adhesive layer 600 and the adhesive layer 602 comprise an adhesive material soluble in a solvent that can be air dried. For example, the adhesive layer 600 and the additional adhesive layer 602 include water-soluble and air-dried adhesive materials or materials that are air-dried to dimensionally stable non-adhesive states impervious to water or water vapor.

The adhesive layer 600 and, on the other hand, the adhesive layer 602 comprise the corresponding polymeric materials having a melting temperature below 148.89 ° C, which is below the temperature of the softening point Tg of the polymeric materials in the layers 102, 104 of the bag 100. On the other hand, each of the adhesive layers 600 and the additional adhesive layer 602 include air-dried adhesive materials, at a temperature below the temperature required to be activated to adhesive states. .

The adhesive layers 600, 602 are activated to an adhesive state by the application of heat at a lower heat activation temperature at the heat activation temperatures of traditional or standard hot melt adhesives or solvent-based adhesives which can seal the traditional paper and laminated polymer bags without damaging the paper layers, but which exceed the temperature of the softening point Tg of the polymeric bags 100 made without paper layers. Standard or traditional hot melt adhesives can not be combined with polypropylene 100 bags because temperatures Necessary to activate the adhesives are destructive to the structure of the PP material.

The diments of the adhesive layers 600, 602 comprise an aqueous dispersion of an adhesive material or a water-based adhesive material applied in liquid form and air-dried or cured to a solid non-adhesive state when air-dried at room temperature. . Additional diments of the adhesive layers 600, 602 each are an acrylic-based water adhesive or a polyurethane dispersion adhesive, or a butyl, synthetic or natural rubber adhesive. Other diments of the adhesive layers 600, 602 include a water dispersed polyurethane (PUD) adhesive. A preferred diment is formed by 35 percent solids. Applies to 1.75 grams / wet weight bag, assuming a bag 45.72 cm wide, through the sealing area of 7.62 cm. The viscosity is adjusted to correspond to the mass flow rate of the preferred diments of an applicator apparatus and method, for example, a slot die applicator that applies a strip of adhesive layers each with a viscosity of 800-1000. centipoise and a sufficient coating weight to form an adhesive to adhesive seal that will withstand the bag tests described herein.

One diment of the adhesive layers 600, 602 for compression sealing of woven bags of PP 100 comprises synthetic polymer or copolymer emulsions that are water based or solvent based, including without limitation polyurethane dispersion adhesives, vinyls, acrylics, or other emulsions of polymers or copolymers, or may include adhesives based on natural or synthetic rubber, which are applied and solubilized on a wet basis and then dried to a hardened state impervious to water and water vapor. The apparatus for application known for use in a production line includes, but is not limited to spray applicators, wheels, or slot die applicators. Adhesive layers 600, 602 form an adhesive-to-adhesive seal when activated to adhesive states by heat applied with a jet of hot air or other heat source at an elevated temperature of up to about, and less than about, 148.89 ° C. which is less than the melting point temperature of the polymeric polyolefin films and / or PP woven materials of the bag panels 106, 108 and the bag wrinkles 110 when present. These layers of adhesive 600, 602 that provide a bond and adhesion suitable for polyolefin films and / or woven PP materials, are approved by the FDA for non-direct contact with food and provide adequate resistance to shear stress, shedding and to the joint to meet the test parameters for bags that are described herein.

Two adhesive layers 600, 602, in particular, are an acrylic-based water adhesive and a polyurethane dispersion adhesive. Each one has an adhesive state activation temperature of less than 148.89 ° C, and less than the temperature of the softening point Tg of the polymeric layers 102, 104 made of compostable polypropylene, for example.

One diment of the adhesive layers 600, 602 includes: a dispersion of polyurethane adhesive of 35% solids in water, with a viscosity adjusted for application in the bags, for example, a viscosity of about or about 800-1000 centipoise for its application by means of a slotted die applicator or less than about 800 centipoises for its application by means of a spray applicator. The viscosity is modified or adjusted to obtain an optimum flow rate of mass and to achieve a desired coating weight as necessary for the application by a specific form of applicator. Adhesive 1623-63A, from Bostik, Inc., auwatosa, Wl 53226, USA, is commercially available, wherein the adhesives per se are not part of the present invention except that they are a structural component of the bags disclosed herein. The modalities of the adhesive layers 660, 602 as a structural component of the bags include 1.75 grams of adhesive material per bag applied on a wet basis, solubilized in water, assuming a bag of 45.72 cm in width and a strip of adhesive of 7.62 cm wide on the bag, which is equivalent to 0.6 grams per dry base bag or about 4.81 kg per dry weight coating heap. Once the adhesive layers 600, 602 are applied, they must pass under a drying system to evaporate the water and dry the layers of adhesive to a solid state impervious to water, water vapor and ambient temperatures.

Bag 100 includes material or heat-sealable materials in low melting, woven, and solid polyolefin films. The suitable adhesive material or materials are applied to the surfaces of the bag as a solution or emulsion, and are air dried at temperatures below their heat activation temperatures to evaporate the volatiles from the solvent or water and solidify. The solid adhesive materials are not sensitive to moisture or pressure to activate to an adhesive state and thus avoid contamination of the contents of the bag during filling of the bag.

A suitable adhesive material for hot sealing the polyolefin films of the bag 100 comprises a water-based emulsion of triethylamine adhesive commercially available as AQUAGRIP® 19566F, manufactured by Bostik, Inc., 1 1320 Watertown Plank Road, Wauwatosa, Wl 53226, USA Another embodiment of a hot-melt adhesive for hot sealing the polyolefin films of the bag 100 comprises a commercially available hot melt adhesive H9463, made by Bostik, Inc. Wauwatosa, Wl 53226, USA, where the adhesives per se are not part of the composition. present invention except that they are a structural component of the bags disclosed herein. The hot melt adhesive H9463 has a softening point temperature of 148 ° C (298 ° F), a temperature for liquid flow of 177 ° C (350 ° F) and a viscosity of 18,000 centipoise at 62.8 ° C (325 ° F) and from 900 centipoise to 190.6X (375 ° F).

Another embodiment of a hot-melt adhesive for hot-sealing the polio films of the bag 100 comprises a hot melt adhesive H9477, Generation II of H9463, now or soon to be commercially available, prepared by Bostik, Inc. Wauwatosa, Wl 53226, USA, where the adhesives per se do not form part of the present invention except that they are a structural component of the bags disclosed herein.

Another embodiment of a suitable adhesive material for hot sealing the polyolefin films of the bag 100 comprises a water-based dispersion or emulsion as the liquid or opaque fluid of a copolymer of ethylene or copolymers of ethylene, butyl acetate and acetaldehyde, which is commercially available as an adhesive material of the ROBOND ™ HS 37-140 brand, manufactured by Rohm and Haas Company, 100 Independence Mali West, Philadelphia, PA 19106-2399, USA, where the adhesives per se are not part of the present invention except that they are a structural component of the bags disclosed herein.

Another embodiment of a suitable adhesive material for hot-sealing the polyolefin films of the bag 100 comprises a water-based dispersion or emulsion such as liquid or opaque fluid, including an ionomer dispersion in water, based on the Surlyn® ionomeric resin, and that can be diluted or thickened or crisscrossed to get better properties, and which is commercially available under the brand ADCOTE ™ 37-220 Hot Sealing Coating, manufactured by Rohm and Haas Company, 100 Independence Mali West, Philadelphia, PA 19106-2399, USA, which during oven drying must achieve a minimum temperature of 82 ° C (180 ° F) and which must reach a hot sealing temperature of 93 ° C (250 ° F), where the adhesives per se do not form part of the present invention except that they are a structural component of the bags disclosed herein.

Another embodiment of a suitable adhesive material for hot sealing the polyolefin films of the bag 100 comprises a water-based dispersion or emulsion as a liquid or opaque fluid, which includes water, an acrylic polymer, a polyurethane polyester resin, formaldehyde, hydroxide ammonium, alumina, and that also includes ammonia as a combustion product, which is commercially available as an adhesive material of the brand NWC 23526K (and NWC 23526KC) HOT SEAL FDA BASE WATER FOR POLYWOVEN ™, with product code 728575, manufactured by ASHLAND Inc., Zip Code 2219, Columbus, OH 43216, USA, where the adhesives per se are not part of the present invention except that they are a structural component of the bags disclosed herein.

This description of the exemplary embodiments is intended to be read in conjunction with the accompanying drawings, which should be considered as part of the entire written description. In the description, relative terms such as "lower", "upper", "horizontal", "vertical", "up", "down", "up", "down", "top" and "bottom" as well as derivatives thereof (eg, "horizontally," "downward," "upward," etc.) should be interpreted to refer to the orientation as described below or as shown in the figure under discussion. Relatives are used to facilitate the description and do not require building or operating the apparatus in a particular orientation.The terms referring to connections, couplings and the like, such as "connected" and "interconnected", refer to a relationship where the structures are secured or annexed to each other either directly or indirectly through intervention structures, as well as mobile or rigid connections or relationships, unless expressly described otherwise.

The patents and patent applications referred to herein are incorporated by reference in their entirety. Although the invention has been described in terms of exemplary embodiments, it is not limited thereto. On the contrary, the appended claims should be broadly construed so as to include other variants and embodiments of the invention, which may be made by those skilled in the art without departing from the scope and range of the equivalents of the invention.

Claims

NOVELTY OF THE INVENTION CLAIMS

1 .- A bag that is constructed of polymeric material and that is adapted to be closed and sealed after being filled with the contents, comprising: a polymeric tube closed at one end to provide a bag having a closed end; the bag has a first panel, a second panel and lateral wrinkles, the first panel having a first section and a second section; another end of the bag has a stepped construction through which the bag is filled with the contents, wherein the stepped construction includes the second section, portions of the lateral wrinkles extend beyond the second section and a portion of the second panel extends beyond the portions of the lateral wrinkles; a first adhesive material on the first section and a second adhesive material on the stepped construction, which reach adhesive states by heating at a temperature below the temperature of the softening point of the polymeric material; the first panel has a third section between the first section and the second section; the first adhesive material and the second adhesive material are absent from the third section, wherein the third section is free of adhesive; said other end of the bag can be closed and the bag is foldable along the third section without displacing or expelling adhesive from the third section in order to minimize contamination by adhesive on the surfaces of the bag, wherein the first adhesive material and the second adhesive material are in contact and under pressure below the third section and provide a seal of adhesive to adhesive.

2 - . 2 - The bag according to claim 1, further characterized in that the bag is creased to provide a fold line along the third section, and the tube is foldable along the fold line.

3. - The bag according to claim 1, further characterized in that the bag comprises a woven polymer layer and a non-woven polymer layer.

4. - The bag according to claim 1, further characterized in that each of the portions of the lateral wrinkles includes a first portion of wrinkles that joins the first panel and a second portion of wrinkles that joins the second panel, where the The first portion of wrinkles and the second portion of wrinkles extend the same length beyond the second section.

5 - . 5 - The bag according to claim 1, further characterized in that each of the portions of the lateral wrinkles includes a first portion of wrinkles that joins the first panel and a second portion of wrinkles that joins the second panel, where the first portion of wrinkles and the second portion of wrinkles extend to different lengths beyond the second section.

6. - A method for closing and sealing an end of a bag taken from multiple bags each made of a polymeric material, wherein the bag has a first adhesive material on a first section of a first panel, and has a second adhesive material on a stepped construction, which includes a second section of the first panel, portions of the lateral wrinkles extending beyond the first panel and a second portion of a second panel extending beyond the lateral wrinkles, the method comprising: heating the first adhesive material and the second adhesive material to its adhesive states, while moving the bag along a hot air distributor after the bag has been filled with the contents, and the bag closed and wrinkled, wherein the first adhesive material and the second adhesive material are absent from a third section of the first panel, and wherein the third section is free of adhesive; move the third section free of adhesive along a section of the hot air distributor, which minimizes contamination by adhesive; folding the bag along the third section without displacing or expelling adhesive from the third section, which minimizes adhesive contamination of the bag surfaces; and applying pressure to contact the first adhesive material and the second adhesive material and form an adhesive to adhesive seal, which seals the end of the bag through which the bag is filled with the contents.

7. - The method according to claim 6, further characterized in that it comprises: heating the adhesive material to its adhesive state while having a dimension up to 3.81 cm wide on the first section of the first panel, and heating the adhesive material to its state adhesive while having a dimension up to 3.81 cm wide on the stepped construction of the bag.

8. - The method according to claim 6, further characterized in that it comprises: moving the bag continuously along the distributor of hot air, while heating the adhesive material to its adhesive state.

9. The method according to claim 6, further characterized in that it comprises: predisposing the stepped construction of the bag towards the upper wall of the hot air chamber while heating the adhesive material on the stepped construction to its adhesive state.

10. - The method according to claim 6, further characterized in that it comprises: separating the adhesive material from the upper wall of the hot air chamber to avoid contact between them while the adhesive material is heated to its adhesive state.

11. - The method according to claim 6, further characterized in that it comprises: separating the adhesive material from the back wall of the hot air chamber to avoid contact between them while the adhesive material is heated to its adhesive state.

12 -. 12 - The method according to claim 6, further characterized in that it comprises: folding the bag along the fold line, wherein the adhesive material on the second panel separates from the fold line and forms an adhesive seal to adhesive with the adhesive material on the first section of the first panel below the fold line.

13. - A system for carrying out the method of claim 6, comprising: a bag taken from multiple bags each made of polymeric material and closed at one end, and the bag has a first adhesive material on a first section of a first panel, and has a second adhesive material on a staggered construction of the bag, and the stepped construction of the bag includes a second section of the first panel, portions of the lateral wrinkles and a portion of a second panel, wherein the first adhesive material and the second adhesive material are absent from a third section of the first panel, and wherein the third section is free of adhesive; a hot air distributor along which the bag moves after the bag is filled with the contents and closed, and the bag is creased to provide a crease line, where the hot air distributor heats the first adhesive material and the second adhesive material to its adhesive states; a section of the hot air distributor along which the third adhesive-free section is moved, which minimizes contamination by adhesive; a sheet for predisposing the staggered construction of the bag to follow along the distributor while the bag is being moved; and a trailing end of the sheet to fold the bag along its third section without displacing or expelling adhesive from the third section, which minimizes adhesive contamination of the bag surfaces, and to be followed by an apparatus of compression closure that applies a clamping pressure to form an adhesive-to-adhesive seal, which seals the end of the bag through which the bag has been filled with the contents.

14. - The system according to claim 13, further characterized in that it comprises: a wrinkling apparatus for wrinkling the bag along a fold line, while the bag moves after the bag is filled with the contents through from the end of the bag.

15. - The system according to claim 13, further characterized in that it comprises: a compression closure device that follows the drag end of the sheet and applies a clamping pressure to form an adhesive to adhesive seal.