TWI810958B - An apparatus and a method for producing a bag with an integrally closed bottom and self-closing top and a bag - Google Patents

Abstract

The invention describes an apparatus and a method for producing a bag made from fabric which may be woven fabric, non-woven fabric, optionally coated or laminated, with integrally formed bottom and a bag that may be block-bottom type, may have a valve, or may be of pillow type and easy to close after filling. The apparatus comprises a conveyor (4) with perforations and edge (35), cutting unit (6), opening unit (7) to open the layers said cut piece (1) to form a mouth, suction device and a suction block (28) having a curvature to form a smooth path of travel for the cut piece (1) and provided with suction openings (29), first and second penetrators (8, 9) rotatable about a pivot (20) and capable of making cut in fabric, first folder (11) and a first sealing device (2) at single station, second folder (12) and press tool (17).

Description

Apparatus and method for producing a bag with an integral closed bottom and a self-sealing top and bag

The present invention relates to a device and a method for producing a bag with an integral closed bottom and a self-sealing top and a bag so produced. More specifically, the present invention relates to a device and a method for producing a bag having an integral closed bottom and an open or self-sealing top, a bag so produced.

Bags or sacks have been used for packaging/storing/transporting materials such as various food grains, flour and industrial materials.

Bags are usually made from tubular web material obtained from a circular or flat knitting machine, which can be made in two steps, first obtaining a flat fabric from a loom and secondly converting the flat fabric in a tuber machine. Formed into tubes.

Bags made of tubular fabric are commonly, but not exclusively, used for storing powdered materials such as cement, chemicals, and the like. These bags are economical because the tubular fabric is woven directly on the loom. However, these bags vary in width due to the varying width fabric obtained from the loom, so individual bags vary slightly during material filling and stacking.

On the other hand, bags made of flat fabric formed into tubes in a tube making machine are bags of higher quality appearance for storing shopping goods because they are coated with a layer of colored biaxially oriented polyester. It looks good when using propylene (BOPP). However, when compared to bags obtained from tubular fabrics, these bags are not as good in strength due to joint crease formation during the fabrication of the tube from the flat fabric.

There are mainly two types of bags widely used in the industry: pillow type and box type.

Box bags are made using heat sealing techniques, however, their manufacturing process is capital intensive involving complex mechanisms for forming the bags. Pillow bags, on the other hand, are primarily made by sewing one end of a tubular fabric by properly folding the end to be seamed. Suturing is a simple and economical procedure that can be performed manually or automatically. However, it is due to compromising the integrity and strength of the mesh by puncturing the mesh material.

Some manufacturers use high-strength materials to compensate for the loss of strength due to holes made by the needles used for suturing, however it is not possible to achieve a complete seal of the filled material from the outside environment. Seaming also leads to theft and spillage of material, especially during transport and disposal of bags. Bottom seamed bags are also problematic for packaging of hygroscopic materials because they can absorb moisture from the atmosphere through the holes formed by the needles. The necessary folds at the ends to be sewn also require a greater length of web, which is an economical disadvantage.

To overcome problems such as loss of seal integrity and theft, heat sealing techniques such as heating rods or ultrasonic methods can be used to seal pillow bags, however these methods require precise operational control and high strength webs, in the absence of which There is a risk of the filled bag bursting and this lowers the packaging weight limit.

Another problem with currently known methods of bottom closure for pillow bags is that they require additional items such as multifilament yarns for bags made by sewing or to be welded by hot air or Another closure strip is glued to the bottom of the bag. This is another economic disadvantage of the presently known methods of closing the bottom of the bag.

The sealing method described above is well known in the industry both for bags made of tubular fabric and for fabrics obtained by making flat fabric into tubes by a tube making machine.

One important aspect of bag formation is how easily one can close the bag. Currently, a filling valve is provided during the sealing procedure of one of the open ends, whereby the bag can be filled after the sealing has been performed. Alternatively, a filled bag can be sealed at its open end using techniques such as sewing, gluing it, or heat sealing it.

There are many bag sealing techniques and bags made using them. One such technique is disclosed in U.S. Patent 10035637 ('5637), which discloses details of the construction of a multilayer plastic bag. This patent ('5637) further discloses a plastic bag with side gussets that is sealed by applying an amorphous alpha-olefin adhesive to the layers of the fabric and then closing it. This patent ('5637) does not disclose any device or automatic bag forming machine for forming such bags that results in a loss of productivity. One disadvantage of the present invention is that it does not suggest how to control the amount of binder. The use of too much adhesive in each layer will hinder the folding process in an automatic production line, so it is almost impossible to make this type of bag in a high output continuous production line.

Another bag sealing technique is disclosed in European patent EP 1899235 ('235). This patent ('235) relates to a side gusseted bag produced from polyolefin material and comprising a tube section comprising the front wall of the bag and side walls comprising side gussets. The tube section also has a bottom section at the end of the tube section, wherein the material of the tube section is folded up to 180° about an axis extending substantially at an angle to the side gussets. The bag is characterized by a sheet covering at least part of the folded section. However, this patent does not disclose any device or automatic method of making such bags. Again, using an extra sheet to cover the bottom folded end will end up adding to the bag of weight.

In addition, another US Patent No. 4,008,850 ('8850) discloses the formation of a gusseted pouch with sealed ends. This patent ('8850) discloses a spill-resistant, leak-resistant bag formed from a multi-walled tube of gusseted fabric, paper, having stepped buildup and bag walls at each end of the tube for attachment to the side walls of the bag to provide closed bag ends. This patent ('8850) uses paper rather than polymer or plastic fabric for bag formation, which is easy to manufacture, however the patent does not disclose any automated method of making such bags. Furthermore, the major disadvantage of the patent ('8850) is that multiple layers are cut or formed at the edges prior to folding and sealing, which ultimately reduces productivity.

A further aspect of bag formation is that after filling, the bag can be placed in an upright position so that its bottom can be flat to the surface on which the bag rests. This ensures that the bag is easy to stack upright and facilitates the display of the bag for shopping.

Therefore, there is a need for a bag/sack and method of producing the same which overcomes these disadvantages so that the integrity and strength of the mesh material is not unduly compromised and at the same time the seal is strong and complete.

The main object of the present invention is to provide a device and a method for making a bag with at least one end closed.

Another object of the present invention is to provide a bag with an easy-seal feature after filling.

Yet another object of the present invention is to provide a bag with an integral closed bottom which reliably seals the bag after filling.

A further object of the present invention is to provide an apparatus for making integral closure mechanisms on an automatic bag making line operating at high speed.

Another object of the present invention is to provide an easy upright stacking, fast filling And closed operation of woven bags.

It is a further object of the present invention to provide a method and apparatus for making a woven packaging bag which can have a valve at the top at at least one end.

Another object of the present invention is to provide a device that can be integrated with an automatic bag-making production line.

The present invention provides an apparatus and method for producing bags with an integrally formed bottom. The present invention further provides an apparatus and method for providing easy sealing of a bag after filling. For the purposes of this description, the terms mesh, mesh material or fabric may be used synonymously.

The bag may be of the square bottom type, may have a valve, or may be of the pillow type and made of a mesh sheet having more than one layer, comprising a front wall, a rear wall, a first side wall, a second side wall , an inner surface, an outer surface, a top end and a bottom end. The mesh sheet comprises a first layer made of a woven polymer or optionally a nonwoven polymer mesh and a second layer made of an adhesive coating or extrusion coating, the adhesive coating or extrusion coating The coating is made of any material such as polypropylene, polyethylene, polyethylene terephthalate, polyamide or any combination thereof, or paper.

Optionally, provide a third layer comprising oriented polypropylene, biaxially oriented polypropylene, oriented polyethylene, biaxially oriented polyethylene, oriented polyethylene terephthalate, biaxially oriented polyethylene terephthalate Diester, oriented polyamide, biaxially oriented polyamide, coated paper, or any combination thereof.

In one embodiment, the third layer is a BOPP laminated film with high-end graphics or printing so that it forms a three-layer structured bag. In a further embodiment, the bag comprises at least two layers such that the first layer is made of a woven polymer or optionally non-woven polymer mesh, a second layer formed by coating is laid over the first layer superior. Furthermore, the second layer may comprise a printing area such that by using any such known printing method performed by any other printer Finished printing.

The tubular fabric may be of the gusseted type made from flat fabric and then processed in a tube machine or may be tubular fabric obtained directly from the loom. The main advantage of the gusseted fabric obtained using the homemade tube machine is that no laminated side gathers are formed, but a smooth surface is obtained where we can perfectly print the branding.

However, despite this, the present invention provides a solution for any type of fabric cutter.

As used herein, terms such as first end and top end are synonymous, and the terms second end and bottom end are also synonymous. These terms are used so that in the case of a cut piece the fabric is represented by a first end and a second end, while in the case of a bag the fabric is represented by a top end and a bottom end.

In an automatic bag making line, various procedures are carried out by which tubular or flat fabrics are converted into bags. Some of these procedures are:

A web roll feeding member in which a roll of woven or non-woven fabric is loaded to feed the fabric in the forward direction

Web edge guiding and unwinding member, where the fabric is guided on rollers and unwound from a roll of fabric

The mesh fabric preparation member, wherein The preparation means optionally consists of a mesh perforation means to remove all air pockets between the layers of fabric for smooth operation. Some examples of preparation components are as follows:

o Positioning hole (index hole) punching member

o Web cleaning member

Optionally, the sensing means senses printed indicia in the case of printed fabric.

The web cut to length cutting member cuts the fabric to the desired bag length.

In the present invention, the tubular fabric after being cut by the cutting machine is transferred to the traversing direction so that the first and second open ends of the cutting member are now parallel to the edges of the traversing unit. The first open end of the cutting member is opened so that the two layers thereof are sucked individually by the open unit to form a mouth. Simultaneously, a pair of penetrators rotate around the pivot and make a cut at a predetermined distance at the side wall of the cutting member. The cut piece is then transferred below the first folding unit where the top layer of the cut piece is folded to form the first fold and at the same time a sealant is applied at a distance "r". The distance "r" is one of the minimum distances required for the folded inner wall to cover the cutting layer (this is defined in a later stage of application). The second folding is now performed by the second folding unit and the bottom is sealed by passing through a pressurized tool. The bags thus formed are stacked above the stacking unit and sent for further use.

The top sealing unit can also be integrated with the device of the present invention or can be driven separately.

The top sealing unit applies the strip over the layer of bags during the continuous movement of the bag while handling the bottom seal. The strip is divided into two parts, one area is glued over the cut piece with a sealant and the other area has a special sealing substrate and can be removed after filling the bag and glued on the other layer to seal the bag.

Optionally, the valve can also be introduced at the second open end and sealed by a strip, in which case the bottom remains unchanged.

Thus, the bag obtained can stand upright after filling and it also looks good since it does not have any seamed appearance.

Accordingly, the bag of the present invention comprises a cut piece (1) made of a fabric of mesh material as described herein having a tubular shape, preferably transformed by means of a heat seal to form an integral bottom closure Form a bag with a closed bottom end.

In another aspect, the present invention provides a method for producing a One device for bags. The device can produce bags made of mesh material which can be woven fabric, non-woven fabric, coated or laminated as the case may be.

A further aspect of the invention is to provide a bag with an easy top seal so that the top can be easily closed before or after filling.

1: cutting pieces

1A: First open end or top end

1B: second open end

1C: first folded end

1D: second folded end

1E: Folded end of fabric

1F: top floor

1G: bottom layer

1H: the first middle layer

1I: Second intermediate layer

2: The first sealing device

3: the device of the present invention

4: Conveyor

5: Tubular fabric

6: Cutting unit

7: Open unit

8: The first penetrator

9: Second penetrator

11: First Folder

12: Second folder

13: Second sealing device

14: First fold

15: Second fold

16: stacking unit

17:Pressure tool

18: Adhesive

19: bag

19A: front part

19B: side part

19C: Bottom part

19D: Open end

19E: closed end

20: Pivot

21: strip

22: Volume

23: Strip cutting machine

24: Lateral cutting unit

25: Filled bag

27: Removable adhesive

28: block

29: Suction opening

30: cut point

31: The first bag

32: The second bag

33: The third bag

34: The fourth bag

35: Edge of Conveyor

36: Suction device

Figure 1 shows an apparatus according to the invention for producing a bag with a sealed bottom.

Figure 1A shows a part of the device of the present invention.

Figure 1B shows another part of the device of the present invention.

Figure 2 shows the various procedures involved in the formation of a bag in which the bottom end is sealed.

Figure 3 shows a bag of the present invention with a bottom sealed end.

Figure 3A shows a bag of the present invention with a bottom sealed end and a top seam.

Figure 3B shows a bag of the present invention with a bottom sealed top end with a valve and seaming.

Figure 3C shows a bag of the present invention with a bottom sealed end and a valved and sealed top end.

Figure 4 shows an apparatus of the invention for producing bags with a top strip for closing after filling and bottom sealing.

Figure 5 shows the various procedures involved in the formation of a woven packaging bag having an easy-seal top and a bottom end seal.

Figure 6 shows a bag of the present invention having a bottom seal end and an easy-seal top.

Figure 1 shows the invention of converting a tubular fabric (5) into a finished product as a bag (19) Mingzhi Device (3). The tubular fabric (5) is specifically but not necessarily a gusseted type obtained from a tubular fabric woven on a loom or obtainable from a flat fabric woven on a loom followed by making a tube in a tube machine. The tubular fabric (5) is optionally laminated with BOPP.

On the conveyor (4) the tubular fabric (5) is conveyed in the direction of longitudinal movement as shown by the arrow. The tubular fabric (5) is cut into predetermined lengths of tubular cutting pieces (1) by means of a cutting unit (6) such that a first open end (1A) and a second open end (1B) are obtained. The cutting element ( 1 ) having a tubular shape is now run in the transverse direction as shown by the arrow.

The device (3) also comprises an opening unit (7) such that it opens the layer with the tubular cutting element (1) to form a mouth. The opening can be performed pneumatically or by installing a vacuum (suction) which sucks the upper and lower layers of the cutting piece (1) away from each other. In this case, the conveyor (4) has perforations (or holes) through which a constant suction is maintained by the suction means (36) holding the lower layer of the cutting elements (1). The suction means (36) as shown in FIG. 1A may be a high capacity blower that creates a vacuum by sucking air and returning the sucked air to the environment. The top layer is held by a suction block arrangement that can be moved upwards to obtain a mouth opening. This method is semi-dynamic, in which the cutting element (1) stops for a moment until the opening procedure takes place. Mechanical methods such as the use of clips to hold the layers of the cutting element (1) are well known to those skilled in the art.

Suctioning can be further performed in automatic form without semi-dynamics. Suction means (36) generate suction in the block (28) with suction openings (29). The block (28) is constructed such that it assumes a form of curvature to form a smooth path of travel for the cutter (1 ), as shown in Figure 1A. Once the top layer (1F) is gripped by the suction opening (29) and the bottom layer is gripped by the conveyor (4) (which also has a suction opening (29) so that a mouth is formed), while rotating about the pivot (20) includes The lateral cutting unit (24) of the first and second penetrators (8, 9) enables a cut to be made at a cutting point (30) on the first intermediate layer (1H). The middle layer is only obtained when the fabric has gussets. The gusset fabric has what is known as the first middle layer (1H) And the two inner layers of the second middle layer (1I).

The first and second penetrators (8, 9) can be of the same construction, having a sharp edge so that they can cut the tubular cutting piece (1) at the cutting point (30).

The device (3) also includes a first folder (11) and a first sealing device (2) at a single station (i.e., the same station) to increase the productivity of the system, because simultaneously on the same cutting element (1) Two operations such as folding and gluing are done. The cutting part (1) is now brought into the first folder (11), which folds the top layer (1F) with the second middle layer (1I), while the first sealing means (2) apply the adhesive ( 18) Dispensed over the surface of the top layer (1F) of the cutting element (1), thus performing the first fold (14).

In one of these embodiments, before applying the adhesive (18), the surface is corona treated or treated by any other method, whereby the adhesion of the adhesive (18) on the surface becomes firm .

As shown in Figure 1B, a region "r" is left, after which the application of the adhesive (18) is dispensed so that the movement of the first sealing means (2) can be relative to the edge of the conveyor as shown by the arrow (35) Adjust back and forth. An adjustment of the first sealing means (2) is required so that the adhesive (18) can be positioned very easily exactly behind the zone "r" on the cut pieces of different lengths by the first sealing means (2).

The device (3) also has a second folder (12) that folds the bottom layer (1G) and is pressed by a press tool (17) to form a closed end (19E) and to form a second fold (15). The completed bag (19) with closed end (19E) and one end (19D) is transferred to the stacking unit (16) for further needs.

In one of these embodiments, the bag (19) may be made of tubular fabric without gussets.

In one of these embodiments, the device (3) can be integrated or modified at side B if the bag (19) is to feature a self-sealing option at the top side or at the first open end. As shown in Figure 4, in addition to the device (3) defined in Figure 1, at side B, the device (3) also includes a second sealing means (13) located near the first open end (1A) ), so that it dispenses the adhesive (18) over the top layer (1F) of the cutting piece (1). Furthermore, a strip (21) is unwound from a roll (22) and adhered to the adhesive (18) while simultaneously pressing the strip with the help of a press tool (17). The word "simultaneously" is explicitly used herein so that several operations are performed on the same cutting piece (1 ) at the same station at one time.

The strip (21) is a special strip prepared from woven fabric, the front half of which is pre-coated along the width with a removable adhesive (27) or a peel-off cover and the remaining half with PE or PPE or any kind of plastic coating known to those skilled in the art.

Half of the strip (21) coated with plastic film is glued over the top layer (1F) at the open end (1A).

The device further comprises a strip cutter (23) for cutting the strip (21) after a predetermined interval to remove the connection between the two bags. Bottom sealing is done as described for FIG. 1 . The device (3) shown in Figure 4 produces a first bag (31).

In another embodiment, the device (3) can be integrated or modified if the bag (19) is to feature a valve at the top side or at the first open end (1A), with seaming. In the case of valved bags, the device (3) comprises at side B a valve forming unit at the first open end (1A) and another folding unit, followed by a seaming unit to produce a third bag (33).

Furthermore, in another embodiment, the device (3) can be integrated or modified if the bag (19) is to feature a valve at the top side or at the first open end, without stitching. The seaming unit described above can be replaced by a heat welding or gluing system to produce a fourth bag (34).

In yet another embodiment, the bag (19) may be closed at the first open end (1A) by seaming, which is done after filling the bag to obtain the second bag (32).

As shown in Figure 2, the bag (19) formation involves the following steps: (A) from the net puller, pulling the tubular fabric (5) from the fabric roll to the cutting unit (6) in the longitudinal direction; (B) now cutting At the unit (6), the tubular fabric (5) is cut into a predetermined length to form the first open end (1A) and the second open end (1B); (C), (D) In addition, the cutting piece (1) is transferred To the opening unit (7), where the top layer (1F) and bottom layer (1G) are opened to form a mouth (as indicated by step C) with both the first and second penetrators (8, 9) on the side The bottom layer (1G) is rotated and cut towards the cutting point (30) at the cutting unit (24) (as indicated by step D). The opening unit (7) and the lateral cutting unit (24) are tied at a single station (i.e. the same station); (E), (F) at the second open end (1B), now by the first folder (11 ) Folding the top layer (1F) (as indicated by step E) and at the same time applying adhesive (18) by the first sealing means (2) over this top layer (1F) (as indicated by step F). The first folder (11) and the first sealing means (2) are tied at a single station (i.e., the same station); (G) now, at the second open end (1B), by the second folder (12) The bottom layer (1G) is folded over the top layer (1F); (H) the pressure tool (17) presses the folded bottom portion (19C) of the cutting piece (1) to form a firm bond; (I) will thus be formed The bags (19) are further conveyed to the stacking unit (16).

In the above method, as shown in Fig. 2, various procedures are executed simultaneously, which is represented by the dotted rectangular box.

In yet another embodiment, at steps (C), (D), the valve forming means makes a valve at the first open end (1A) and folds and sews the first opening at steps (E), (F) end (1A) to form a top closed end to obtain a third bag (33), as shown in Figure 3B.

In a further embodiment, at steps (C), (D), the valve forming device forms a valve at the first open end (1A) and at the first open end (1A) at steps (E), (F) ) place folding and sticking strip (21) occurs to form the top closed end to obtain a fourth bag (34), as shown in Figure 3C.

In another embodiment, as shown in Figure 5, the formation of the above bag (19) referred to as the first bag (31) involves the following steps: (A): From the net puller, from the fabric in the longitudinal direction Roll pulling tubular fabric (5); (B): now from the cutting unit (6), the tubular fabric (5) is cut to a predetermined length to form a first open end (1A) and a second open end (1B); (C ), (D), (D'): In addition, the cut piece (1) is transferred to the opening unit (7), where the top layer (1F) and the bottom layer (1G) are opened to form a mouth (as indicated by step C ), and simultaneously the first and second penetrators (8, 9) both rotate and cut the bottom layer (1G) at the cutting point (30) at the lateral cutting unit (24) (as indicated by step D). The opening unit (7) and the lateral cutting unit (24) are tied at a single station. Furthermore, at the first open end (1A), the second sealing means (13) also dispenses adhesive (18) (as indicated by step D'); (E), (E'), (E") : At the second open end (1B), the top layer (1F) is now folded by the first folder (11) (as indicated by step E), and at the same time the adhesive (18) is applied by the first sealing means (2) Apply over the top layer (1F) (as indicated by step E"). The first folder (11) and the first sealing means (2) are tied at a single station. Furthermore, at the first open end (1A), the strip (21 ) unwound from the roll (22) is applied at the same station (i.e. at the same station - as determined by step E' indicated); (F), (F'): Now, at the second open end (1B), the bottom layer (1G) is folded over the top layer (1F) by the second folder (12) (as shown by indicated in step F). In addition, at a single station - that is, at the same station, the strip (21) is cut at predetermined intervals by the strip cutter (23) (as indicated by step F'); (G): the pressing tool (17) The cutting element (1) is pressurized to form a firm bond; (H): The bag (19) thus formed is the first type bag (31), which is further conveyed to the stacking unit (16).

In the above method, as shown in FIG. 5, various procedures are executed simultaneously, which are represented by dashed rectangular boxes.

As shown in FIG. 3 , a bag ( 19 ) is obtained by means of the device ( 3 ) of the invention (wherein the bag is open at one end). The bag (19) has an open end (19D) and a closed end (19E), wherein there are multiple folds at the closed end (19E) to obtain a first folded end (1C) and a second folded end (1D), such that A folded layer end (1E) of fabric is obtained, which is bonded by means of an adhesive (18). In the case of a gusseted fabric, the bag (19) further comprises a first middle layer (1H) and a second middle layer (1I). But in the case of tubular fabrics without gussets, there is no intermediate layer.

In another embodiment, the bag ( 19 ) is available as a first bag ( 31 ), as shown in FIG. 6 . The bag (31) includes a bottom closed end (19E) and a top open end (19D), with sides (19B) and front portion (19A), as shown. The bottom portion (19C) of the bag (19) includes an integral closure with a first folded end (1C) and a second folded end (1D) such that at least two folds are required to construct the bag (31). Furthermore, bottom sealing is also done by means of an adhesive sealant (18) applied at the location shown in Figure 6, so that a folded layer end (1E) is obtained. At the first open end of the bag (1A) At , a strip (21) is applied having an area of removable adhesive (27) that is folded and adhered over another layer of bags (31) to close the other layer after filling Bag (31), thereby cloth is easy to seal.

The bag (31) can be made to look good in various branding positions, with the feature of standing in an upright position after filling.

In yet another embodiment, as shown in FIG. 3A , the bag ( 32 ), which is a filled bag ( 25 ), is shown with a top that is stitched (which is done after filling), with the same seams as in the bag ( 19 ). The bottom of making (19E).

In a further embodiment, as shown in Figure 3B, the bag (33) is formed by making a valve at the top and closing the top with a seam with the same bottom (19E) made in the bag (19). The bag (33) is formed before filling because the valve system provided is used to fill the material.

In yet another embodiment, as shown in Figure 3C, the bag (34) is closed by making a valve at the top and closing it with a strip (21) having the same bottom (19E) made in the bag (19). formed at the top. The bag (34) is formed prior to filling because a valve is provided for filling the material.

While the above description contains many specifics, these should not be construed as limitations on the scope of the invention, but as illustrations of one of its preferred embodiments. It must be recognized that modifications and variations are possible based on the disclosure given above without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be determined not by the illustrated embodiments, but by the accompanying claims and their legal equivalents.

1: Tubular mesh cutting pieces

1A: First open end or top end

1B: second open end

2: The first sealing device

3: the device of the present invention

4: Conveyor

5: Tubular fabric

6: Cutting unit

7: Open unit

8: The first penetrator

9: Second penetrator

10: Conveyor belt

11: First folder

12: Second folder

14: First fold

15: Second fold

16: stacking unit

17:Pressure tool

18: Adhesive

20: Pivot

24: Lateral cutting unit

30: cut point

Claims (29)

A device for producing bags with a one-piece closed bottom and a self-sealing top, characterized in that it comprises: a conveyor (4) with suction openings (29) and with an edge (35 ) a cutting unit (6) for cutting a tubular fabric (5) into cutting pieces (1) of predetermined length, the cutting pieces (1) having a first open end (1A) and a second open end (1B), with a top layer (1F) and a bottom layer (1G) and, in the case of the cut piece with gussets, a first middle layer (1H) and a second middle layer (1I) an open cell (7) for opening the layers of the cutting pieces (1) to form a nozzle-suction means (36) for while the cutting pieces (1) are on the conveyor (4) Maintaining suction on the bottom layer of the cutting elements (1) - a suction block (28) having a curvature to form a smooth path of travel for the cutting elements (1) and having suction openings (29) to support Top layer to form the nozzle - first and second penetrators (8, 9), which are rotatable around a pivot (20) and able to rest on the first intermediate layer (1H) of the cutting elements (1) A cut is made at the cutting point (30) of a first folder (11) and a first sealing means (2), which are seated adjustably relative to the edge (35) at a single station, the A first folder (11) for folding the top layer (1F) and the second middle layer (1I) a second folder (12) for folding the bottom layer (1G), a pressing tool (17) , which is used to pressurize the folded bottom layer (1G) to form a closed end (19E). Device as in claim 1, wherein the opening unit (7) is operated pneumatically or by installing a vacuum (suction) which sucks the top and bottom layers of the cutting pieces (1) away from each other. Device according to claim 1 or 2, wherein the first sealing means (2) is a gluing means and wherein two operations, ie folding and gluing, are performed on the cut pieces (1) at a single station. The device according to claim 1 or 2, wherein while the first folder (11) folds the top layer (1F) and the second middle layer (1I) of the cutting parts (1), the first sealing device (2) Apply adhesive (18) over the surface of the top layer (1F). Device according to claim 1 or 2, wherein the adjustably seated first sealing means (2) is capable of applying adhesive (18) behind a region "r" on the cutting elements (1). The device of claim 1 or 2, wherein a second sealing means (13) is provided near the first open end (1A) at side B to form a top self-sealing seal at the top end, wherein the device comprises a strip (21 ) in the form of a roll (22) - a first sealing means, dispenses an adhesive (18) - a pressing tool (17) for pressing the strip (21) over the top layer (1F) A stroke cutter (23) for cutting the strip (21). The device of claim 6, wherein a valve forming and sewing unit is provided to form a filling valve at the tip, and then the tip is stitched. 6. The device of claim 6, wherein a valve forming and sealing unit is provided to form a filling valve at the tip and then seal the tip using non-puncture techniques. A method for producing a bag (19) with a one-piece closed bottom and a self-sealing top using a device according to any one of claims 1 to 5, characterized in that the method comprises the following steps: a. a web puller pulls a tubular fabric (5) from a fabric roll to the cutting unit in the longitudinal direction; b. using a cutting unit (6) to cut the tubular fabric (5) into a predetermined length and having a first open end (1A) and the cutting pieces (1) of the second open end (1B); c. transfer the cutting pieces (1) to the opening unit (7), where the top layer (1F) and the bottom layer (1G) are opened to Form a mouth and simultaneously rotate the first and second penetrators (8, 9) and cut the bottom layer (1G) of the cutting elements (1) at a cutting point (30) at the side cutting unit (24) ), wherein the opening unit (7) and the lateral cutting unit (24) are at a single station; d. using the first folder (11) to fold the cutting pieces at the second open end (1B) ( 1) the top layer (1F), and at the same time an adhesive (18) is applied on the top layer (1F) by the first sealing device (2), wherein the first folder (11) and the first The sealing device (2) is at a single station; e. the bottom layer (1G) is folded at the second open end (1B) by the second folder (12); f. ) pressurize the cut pieces ( 1 ) to form a firm bond to form a bag ( 19 ); g. convey the bag ( 19 ) to a stacking unit ( 16 ). Method according to claim 9, wherein the opening unit (7) is operated pneumatically or by installing a vacuum (suction) which sucks the top and bottom layers of the cutting pieces (1) away from each other. The method of claim 9 or 10, wherein the first sealing means (2) is a gluing means and wherein two operations, ie folding and gluing, are performed on the cut pieces (1) at a single station. The method of claim 9 or 10, wherein the first sealing device ( 2) Applying the adhesive (18) over the surface of the top layer (1F). The method of claim 9 or 10, wherein after steps c, d, e, several steps are added for performing a seal at the top to obtain a bag (31), such as by means of the second sealing means (13 ) dispensing the adhesive (18) at the first open end (1A) unwinding the strip (21) from the roll (22) and applying to the top layer (1F) of the cutting pieces (1) superior. The method of claim 13, wherein after step f, a valve forming and sewing unit is provided to form a filling valve at the tip, and then the tip is stitched. The method of claim 13, wherein after steps c, d, e, a valve forming a sealing unit is provided to form a filling valve at the tip, and then the tip is sealed using a non-puncture technique. A bag produced using a device according to any one of claims 1 to 5 and a method produced according to any one of claims 9 to 12, characterized in that the bag (19) has a heat-sealed seal to form an integral One of the bottom closures (19E) closes the bottom end. The bag of claim 16, wherein the bag has an open end (19D) at its first open end (1A). The bag of claim 16, wherein the bag has a closed end (19E) at its second open end (1B). The bag of claim 16, wherein the bag has a closed end (19E) at its second open end (1B), the closed end (19E) having a plurality of folds to obtain a first folded end (1C) and a second folded end (1C). The folded end (1D) is such that a folded layer end (1E) of the fabric is obtained. Bag according to claim 16, wherein the bag comprises a first middle layer (1H) and a second middle layer (1I) in the case of a gusseted fabric. The bag of claim 16, wherein the bag comprises no layers without gusset fabric. The bag of claim 16, wherein the bag (31) has a sealed end at its first open end (1A) after filling. The bag according to claim 16, wherein the sealed end is a seamed end. The bag according to claim 16, wherein the open end (1A) of the bag (31) is a valve and a heat-sealed end or a valve and a seamed end. A bag produced using a device according to any one of claims 1 to 6 and a method according to any one of claims 9 to 13, characterized in that the bag (31) has a heat-sealed seal to pass through a strip ( 21) Form an integral bottom closure (19E) and a closed bottom end of a top easy seal. The bag of claim 25, wherein the bag (31) includes a bottom closed end (19E) and a top open end (19D), and sides (19B) and front portion (19A). The bag of claim 25, wherein the bag (31) having a bottom portion (19C) includes an integral closure with a first folded end (1C) and a second folded end (1D) such that at least two folds are required to construct The bag (31). The bag of claim 25, wherein the bag (31) applies a strip (21) to the first open end (1A) of the bag, the strip (21) having a removable adhesive (27) An area that is folded and glued over another layer of bags (31) to close the other layer of bags (31) after filling, thereby constructing an easy seal. The bag according to claim 25, wherein the bag (31) preferably has various trademark printing positions.