TW202019779A - A method and an apparatus for manufacturing a storage bag, and a storage bag - Google Patents

Abstract

The invention discloses a method for producing a storage bag with an integrally formed valve, a resulting bag and an apparatus for producing such a bag. The method is characterised by forming the valve (3) of bag (2) by folding corner (13) of the tubular piece (5) at second open end (8) inwardly to the inside followed by cutting off edge strip (22) of tubular piece (5) with the valve (3) formed and closing the second open end (8) by attaching second sealing strip (25) thereto. In another aspect of the invention at least one hole (29) is made into side wall section (9A and/or 9B) of the tubular piece (5) to establish connection between second sealing strip (25) and at least one side wall (19) of the valve (3). The resultant bag has a valve (3) of height (23) smaller than depth (24) of valve (3) and where second sealing strip (25) is attached to second end (8) of tubular piece (5).

Description

Method and device for manufacturing storage bag and storage bag

The invention generally relates to the field of bags used for transporting, packaging and storing powdered or granular materials (for example, cement).

In particular, the invention relates to a method for producing a bag with an integrally formed valve, a resulting bag and a device for producing the bag.

Bags or sacks have been used for packaging/storage/transport materials such as grain, flour and various industrial materials. There are two main types of bags in use: pillow type and box type. Box-shaped bags are made using heat sealing technology, however, their manufacturing processes are capital intensive. The most common pillow bag is made by properly folding the end to be sewn to sew one end of the tubular mesh. The suture system can perform one of the simple and economical procedures manually or automatically. However, stitching impairs the integrity and strength of the mesh due to the needle piercing the mesh material. Some manufacturers use high-strength materials to compensate for the loss of strength, however, it is impossible to achieve a complete seal of the filled material from the external environment. Stitching also leads to theft of materials, especially during the transportation and handling of bags. The need to fold at the end to be stitched also requires a larger length of mesh, which is an economic disadvantage.

The penetration of the mesh and the resulting theft problems can be overcome by using a heat-sealing technique (such as a heating rod or ultrasonic method). However, these methods require precise operational control and are also high-strength mesh In the absence of these conditions, there is a risk of bursting of the filled bag and it reduces the packaging weight limit.

There is another problem with bags provided with a filling valve that are provided for filling material more safely than filling the material through the open end of a bag. However, the filling valve is usually not firmly connected to the bag. Therefore, there is a risk that the valve may become unfolded or detached from the bag.

Providing bags with self-closing valves (which allows rapid filling and self-closing of filled bags) is well known in the art (for example from AT 512 459 A1). The valve is formed in the flat state of one of the bags by means of a folding device. The bag is usually filled by means of a filling device such as a filling tube. For this purpose, the valve system is deployed and the filling device is inserted into the valve. After retracting the filling device from the bag, the valve is closed due to the internal pressure of the powdery or granular material filled into the bag. In this prior art, the open end of the bag with the valve is closed by folding the top edge and then stitching. However, this weakens the material and can therefore cause the bag to burst. Similarly, the filled material can leak through the stitches, which is of particular concern when filling the bag with cement.

Therefore, one object of the present invention is to eliminate or at least alleviate at least individual disadvantages of the prior art.

Therefore, there is a need to overcome these deficiencies so that the integrity and strength of the mesh material are not excessively compromised and the seal is firm and complete, and a bag/sack with tightly placed valves and a production bag/sack Method.

In particular, one object of the present invention is to provide a bag with an integrally formed valve (which reliably closes the filled bag when the filling device is retracted from the valve to prevent leakage of the filling material) and is particularly durable. In addition, an object of the present invention is to provide a method and an apparatus for producing this bag.

The present invention provides a method for producing a bag with a valve. The bag can be produced from a mesh material, which can be a woven fabric, non-woven fabric, or other composite materials that are coated or laminated as appropriate. Woven polyolefin or woven polypropylene materials are preferred. For the purposes of this description, the term mesh, mesh material or fabric is used synonymously.

Therefore, the method includes the following steps: a) Provide a tubular member made of fabric, specifically a polymer material, preferably woven polyolefin or woven polypropylene material, the tubular member having a first open end and a second open end, each opening The end has a corresponding circumferential edge; b) the first open end of the tubular member is preferably closed by attaching a first sealing strip to it; c) forming the valve of the bag by folding one corner of the tubular member inward at the second open end to the inside of the tubular member; d) cutting off a lower edge strip of the tubular member in which the valve is formed at the second open end thereof; and e) Close the second open end by attaching a second sealing strip to it.

A fabric bag with a valve is also provided. The bag can be produced from a mesh material, which can be a woven or non-woven fabric coated and laminated as appropriate. The sealing strip can be made of woven or non-woven material, in particular a polymer material, preferably coated or laminated, preferably woven polyolefin or woven polypropylene material. An adhesive is pre-applied to the other side of itself attached to the bag. This means that the supplied tape has been prepared with adhesive applied to it.

Therefore, the bag of the present invention includes: -A tubular member made of a fabric, in particular a polymer material, preferably woven polyolefin or woven polypropylene material, the tubular member preferably having a closed section by means of a first sealing strip One end -A valve formed by folding inwardly a corner at the second end of the tubular member to the inner side of the tubular member, a height of the valve is less than a depth of the valve; and -A second sealing strip attached to the second end of the tubular member.

In another aspect, the invention provides an apparatus for producing a bag having at least one valve. The device can produce bags made of mesh material, which can be woven or non-woven fabric coated or laminated as appropriate.

Therefore, the devices disclosed in this article include: a) a supply unit for providing a tubular member made of fabric, in particular a polymer material, preferably woven polyolefin or woven polypropylene material, the tubular member having a first open end and a first Two open ends, each open end has a corresponding circumferential edge; b) a first closing unit, which is used in particular to close the first open end of the tubular member by means of a first sealing strip; c) a valve forming unit for forming the valve of the bag by folding inwardly a corner of the second open end to the inner side of the tubular member; d) a cutting unit for cutting a lower edge strip of the second open end; e) A second closing unit for closing the second open end by means of a second sealing strip.

All aspects of the invention are related to each other, and any embodiments described for one aspect are accordingly related to all other aspects and embodiments mentioned. In particular, the advantages and features mentioned in the context of the method also relate to the device and the bag.

The invention provides a method for producing a bag with a valve. The method includes the following steps: a) Provide a tubular member made of fabric, specifically polymer material, preferably polyolefin or woven polypropylene material, the tubular member having a first open end and a second open end, each open end Has a corresponding circumferential edge; b) The first open end of the tubular member is preferably closed by attaching a first sealing strip to it; c) A valve for forming a bag by folding one corner of the tubular member inward at the second open end to the inside of the tubular member; d) At its second open end, cut a lower edge strip of the tubular member in which the valve is formed; and e) By attaching a second sealing strip to it and closing the second open end by tightening the valve.

The bag can be produced from a mesh material, which can be a woven fabric or a non-woven fabric coated or laminated as appropriate. Woven polyolefin or woven polypropylene materials are preferred.

By preferably but not necessarily sequentially performing steps a) to e) of the method, a particularly durable bag with one integrally formed self-closing valve is obtained, in which the valve is reliable once a filling device is retracted from the bag Close the filled bag. The valve is closed due to the applied pressure of the filling material. Reliably prevent filling materials (specifically, powdery or granular materials such as cement) from leaking from the bottom end of the bag. The valve is thereby formed by the tubular member itself and thus constitutes an integral part of the bag. In other words, the bag containing the valve is made as a single piece, that is, a tubular piece.

The type of bag being produced (for example, pillow type or side fold type) is defined by the form of the tubular member used in the manufacturing process. Therefore, depending on the type of bag being produced, the tubular member may have folds. The inventive method and the inventive device can be used to produce two types of bags.

The tubular member may be made of a synthetic woven fabric, specifically a polymer material, preferably a polyolefin or polypropylene material. The fabric may consist of small flat ribbons or strips with a typical width of at most 10 mm and a thickness of 15 µm to 120 µm. The fabric may or may not be coated. The tubular member has a circumferential side wall, and the circumferential side wall preferably has no openings or holes except for the first and second open ends. The side wall may include several side wall sections. Generally, each sidewall section defines one side of the bag being produced. Due to the flexibility of the material used, the tubular member is preferably substantially flat during the manufacture of the bag. In this case, the side wall may be divided into at least two sections, namely a top and a lower side wall section, which are connected to each other at the side edges of the flattened tubular member. The first open end of the tubular member is opposite to the second open end. At the beginning of the method in step a), both the first and second open ends preferably have substantially the same size.

In step a), the tubular piece is provided, that is, physically placed and prepared for subsequent steps. The step of providing the tubular member may include manufacturing the tubular member. For example, the tubular member can be woven or cut from a (mesh) roll or any other supply member having a continuous (specifically) woven fabric tubular member. Alternatively, the manufacturing can also be independent of step a) and performed before it. In this case, the tubular member can simply be taken from a stack with one of many tubular members.

In step b), the first open end of the tubular member is closed. In order to close the first open end, various closing techniques can be applied. For example, the first open end can be closed by stitching or bonding. However, it is preferable to close the first open end by means of a first sealing strip attached to the edge of the opposite side wall section at the first open end. The first sealing strip can be obtained from a stack with one sealing strip, or can be cut from a continuous sealing strip. If the first sealing strip is cut from a continuous sealing strip, the cutting may occur before or after attaching the first sealing strip to the first open end. The first sealing strip preferably has two strip sections, one at each side wall section of the tubular member and connected to each other. In particular, the profile of the first sealing strip forms a V or a U. The first sealing strip can preferably be bonded or welded to the tubular member by means of hot air or thermal fusion. Thermal welding technology can use laser technology, ultrasound technology or any other high-frequency technology. The two strip sections that are the sides of the U or V profile are thereby attached to the edge of the first open end. Alternatively or additionally, the first sealing strip at the first open end can be sewn to the tubular member, because the load on the stitching at the first (upper) open end can be smaller than at the second (lower) At the open end.

The first sealing strip may be made of woven or non-woven material, in particular polymer material, preferably coated or laminated, preferably woven polyolefin or woven polypropylene material, as the case may be The tape may be pre-applied with adhesive.

In step c), the valve is formed by folding the corner of the second open end (which is still open at this stage) inward to the inside of the tubular member. Since the tubular member is generally flat due to its flexibility, it may be advantageous to raise one edge of the second open end to promote folding of the corner. The resulting valve has two opposed side walls so that a filling device can be received therebetween. In step c), the height and depth of the folded valve are substantially the same. The height of the valve extends in a direction parallel to the longitudinal axis of the tubular member, and the longitudinal axis of the tubular member extends from the first open end to the second open end. The depth extends in a direction perpendicular to the longitudinal axis of the tubular member.

In step d), in particular, one (lower) edge strip of the tubular member in which the valve is formed at its second open end is cut by means of a knife. The cutting is preferably a straight cut without any curved sections. As a result of cutting, the valve is truncated at its lower end. Therefore, the resulting valve has a height shorter than its depth in its final state. In other words: the height of the valve is reduced by the width of the lower edge strip after cutting the corner. This improves the reliability of the self-closing mechanism of the valve in the final bag because it prevents the valve from accidentally folding toward one of the outside in response to the filling of the material. The lower edge strip has a width of at least 10 mm, preferably at least 70 mm, preferably less than 150 mm. After cutting the lower edge strip, the tubular member has the final length of the bag to be produced (that is, the extension in the direction of the longitudinal axis).

In step e), the second open end of the tubular member other than the valve is closed by attaching a second sealing strip to it. The valve is not blocked due to the attachment of the second sealing strip. Corresponding to the attachment of the first sealing strip, the second sealing strip may be obtained from a stack with sealing strips, or may be cut from a continuous sealing strip, in particular from a roll. If the second sealing strip is cut from a continuous sealing strip, the cutting may occur before or after attaching the second sealing strip to the second open end. The second sealing strip preferably has two strip sections, one at each side wall section of the tubular member and connected to each other. In particular, the profile of the second sealing strip forms a V or a U. The second sealing strip can be bonded or welded to the tubular member. The two strip sections that are the sides of the U or V profile are thereby attached to the edge of the second open end. Alternatively or additionally, the second sealing strip at the second open end can be sewn to the tubular member.

The second sealing strip may be made of woven or non-woven material, in particular a polymer material, preferably coated or laminated, preferably woven polyolefin or woven polypropylene material, as the case may be the second sealing strip The tape may be pre-applied with adhesive.

As a key aspect of the present invention, the formed valve is fixed so that it will not expand after filling is completed or in any other event. The simplest way to achieve this is by firmly attaching at least one of the valve walls to the second sealing strip. In a preferred method of fixing the valve, in step e), at least one hole is formed in at least one adjacent side wall section to establish a secure connection between the second sealing strip and at least one side wall of the valve. When in step e) the second sealing strip is attached to the second open end, for example by bonding or welding, preferably hot air welding or thermal welding, at least one side wall of the valve is connected to the second through at least one hole Sealing strip. The second sealing strip can be preferably bonded or welded to the tubular member by means of hot air or thermal welding. Thermal welding technology can use laser technology, ultrasound technology or any other high-frequency technology. Since the second sealing strip is also connected to the adjacent side wall of the tubular member, necessarily, at least one side wall of the valve is connected to the adjacent side wall section via the second sealing strip. The at least one hole is preferably positioned close to the second open end so that it can be completely covered by the second sealing strip.

Preferably, the first and/or second sealing strips are attached to the tubular member by means of welding, preferably hot air welding or ultrasonic welding or bonding.

The position of at least one hole may be predetermined depending on the size of the bag and the valve. Therefore, once it is known where to cut to make the tubular member 5 from the tubular mesh, in fact during the method (i.e., even before any of steps b, c, d, and e) can be at any Perform the action of forming at least one hole at the point.

In step e), the second open end of the tubular member other than the valve is closed by attaching a second sealing strip to it. The valve is not blocked by the attachment of the second sealing strip. Corresponding to the attachment of the first sealing strip, the second sealing strip may be obtained from a stack with sealing strips, or may be cut from a continuous sealing strip, in particular from a roll. If the second sealing strip is cut from a continuous sealing strip, the cutting may occur before or after attaching the second sealing strip to the second open end. The second sealing strip preferably has two strip sections, one at each side wall section of the tubular member and connected to each other. In particular. The cross section of the second sealing strip forms a V or a U. The second sealing strip can be bonded or welded to the tubular member. The two strip sections that are the sides of the U or V profile are thereby attached to the edge of the second open end. Alternatively or additionally, the second sealing strip at the second open end can be sewn to the tubular member.

After performing step e), the second sealing strip can be cut to conform to the width of the second open end (now closed) without the valve. In this way, the second sealing strip does not protrude into the valve section.

As shown in FIGS. 1A and 1B, in a preferred embodiment, the inwardly folded corner used to form the second open end of the valve has a triangle, in particular, an isosceles triangle shape . In this embodiment, the first side of the triangle (the first right-angle side) is oriented substantially in a direction perpendicular to the longitudinal axis of the tubular member, and the second side (the second right-angle side) is oriented substantially parallel to In one direction of the longitudinal axis of the tubular member. As shown in FIG. 1A, before the fold is formed by pleating the side wall, the first side of the triangle is passed through a portion of the pleated side edges of the flattened tubular member. Similarly, before forming the fold, the second side is a part of the opening edge of the second open end. The hypotenuse connects the side wall and the second open end.

According to an embodiment of the invention, step d) may include cutting the lower edge strip at a substantially right angle to a longitudinal axis of the tubular member and along the full width of the second open end of the tubular member in which the valve is formed . The longitudinal axis thereby extends from the first open end to the second open end of the tubular member.

As an alternative to fixing the valve so that it does not unintentionally open or fold outwards (that is, as opposed to inward folding as previously explained), after forming the valve according to step c), at least one side wall of the valve (preferably The bottom edge of one of the side walls of the valve is firmly connected to one of the tubular members adjacent to the side wall section. Preferably, the two side walls of the valve are each connected to the other adjacent side wall sections of the tubular member.

If at least one of the side wall sections of the valve is connected to the adjacent side wall of the tubular member by means of a process for hot melting through the connection purpose, one of the side walls of the valve can be quickly and reliably connected. Alternatively, any welding procedure can be used for this purpose, with which the fabric can be partially melted and at least one side wall of the valve can be connected to the tubular member without using any connecting material (such as an adhesive) Adjacent to the side wall section. Again, preferably, the two side walls of the valve are connected to one of the tubular members respectively adjacent to the side wall section. For this purpose, the two side walls of the valve can be simultaneously connected to their respective adjacent side walls of the tubular member. Alternatively, the side walls may be successively connected to their adjacent side wall sections, that is, in separate welding procedures.

During the welding process, in order to avoid that the side walls of the valve are connected to each other, a separation element may be used during the welding process, in particular a separation layer preferably made of steel to temporarily separate the side walls of the valve from each other. The separating element has the advantage that the side walls of the valve are not welded to each other during the welding process.

Alternatively, an ultrasonic welding procedure can be used to perform the welding.

In one other embodiment, two methods of implementing a fixed valve-that is, one method involves making at least one hole in at least one adjacent side wall section through which the second side strap is firmly connected to One side wall of the valve, and one method is to firmly connect the bottom edge of at least one side wall of the valve, preferably one of the side walls of the valve, to one of the tubular members adjacent to the side wall section.

The present invention further provides a fabric bag, which includes: -A tubular member made of a (specifically) woven fabric, the tubular member preferably having a closed first end by means of a first sealing strip; -A valve formed by folding an angle at the second end of one of the tubular members inward to the inside of the tubular member, the height of one of the valves being less than the depth of one of the valves; -A second sealing strip attached to the second end of the tubular member.

The bag can be obtained by the inventive method. Advantageously, the valve of the bag has a height shorter than its depth. The height of the valve extends in a direction parallel to the longitudinal axis of the tubular member, and the longitudinal axis of the tubular member extends from the first open end to the second open end. The depth extends in a direction perpendicular to the longitudinal axis of the tubular member. The longitudinal axis extends from the first open end to the second open end. The bag has a length preferably between 200 mm and 1400 mm, more preferably between 350 mm and 950 mm. The bag has a width preferably between 170 mm and 850 mm, more preferably between 270 mm and 620 mm.

In order to prevent the valve of the bag from unintentionally unfolding, at least one of the side walls of the valve can be connected to one of the tubular members adjacent to the side wall section.

The invention also provides a device for producing a bag with at least one valve, the device comprising: a) a supply unit for providing a tubular member made in particular of woven fabric, preferably polypropylene, the tubular member having a first open end and a second open end, each open end Has a corresponding circumferential edge; b) a first closing unit for closing the first open end of the tubular member in particular by means of a first sealing strip; c) a valve forming unit for forming a valve by folding a corner of the second open end inward to the inside of the tubular member; d) A cutting unit for cutting a lower edge strip of one of the second open ends; e) A second closing unit for closing the second open end by means of a second sealing strip.

The inventive device can implement the method set forth above. Preferably, the units are arranged in sequence from a) to e). The supply unit may comprise a roll with a coiled continuous tubular piece, for example from which the tubular piece can be cut by means of cold cutting, hot cutting, ultrasonic cutting or laser cutting. Alternatively, the supply unit may include a stack from which the tubular members may be successively obtained. The first closed unit may comprise a large number of sealing strips, in particular V or U-shaped strips. The sealing strip can be obtained from a stack or cut from a roll. For cutting, the first closed unit may include a knife. Alternatively, cold cutting, hot cutting, ultrasonic cutting or laser cutting may be used by the first closed unit. The valve forming unit may include a folding member that folds (ie, presses or shifts) the corner of the tubular member to the inner side of the tubular member. Conveniently, the valve forming unit may further include a lifting member that lifts an edge of the second open end of the tubular member to promote folding of the corner. The cutting unit may include a knife. The second closed unit may be constructed similar to the first closed unit. In order to attach the first and/or second sealing strip to the tubular member, welding (preferably hot air welding, ultrasonic welding) or bonding may be used by the first and/or second closing unit.

In a first embodiment of the device, the first and/or second closing unit has a welding device for connecting the first/second sealing strip to the first/second open end of the tubular member. The welding device, preferably a thermal welding device, can heat and partially melt the first/second sealing strip and/or the first/second open end to form the first/second sealing strip and the tubular member A whole connection. The welding device can also be an ultrasonic welding device.

Furthermore, the device may comprise a bonding unit for connecting at least one side wall of the valve to one of the tubular members adjacent to the side wall section by means of an adhesive.

In a preferred embodiment, the device further comprises a perforating unit for perforating at least one hole in at least one side wall section of the tubular member before closing the second open end by means of the second sealing strip, wherein The (open) hole is punched in the second open end so that when the second sealing strip is attached, a connection is established between the second sealing strip and at least one side wall of the valve.

The position of at least one hole may be predetermined depending on the size of the bag and the valve. Therefore, once it is known where to cut to make the tubular member 5 from the tubular mesh, in fact during the method (i.e., even before any of steps b, c, d, and e) can be at any Perform the action of forming at least one hole at the point.

In another embodiment, the device comprises a welding unit for connecting at least one side wall of the valve to an adjacent side wall section of the tubular member by means of a welding process, preferably a heat welding process. However, the procedure can also be an ultrasonic welding procedure.

In order to avoid connecting the side walls of the valve during the welding process, the welding unit may include a separation element that can be inserted between the side walls of the valve during the welding process, in particular a separation layer preferably made of metal.

In still another embodiment, the device includes both the aforementioned punching unit and the welding unit, the punching unit is used to provide its purpose in the preferred embodiment, and the welding unit is used to turn at least the valve by means of a welding procedure One side wall is connected to one of the tubular members adjacent to the side wall section.

In the following, preferred embodiments of the invention will be explained with the help of figures.

FIG. 1 schematically shows a device 1, here a production line for producing bags 2 with integrated valves 3. The production line has several stations (from left to right) for producing bags. The sequence shown in FIG. 1 is only a preferred embodiment, and individual steps can be exchanged or combined as long as the result remains substantially unchanged. Each step executed can be performed by a dedicated unit of the device 1. Since these units are known per se, they are only indicated schematically in the drawings.

FIG. 1 also shows a web roll 4 from which the tubular member 5 is cut by means of a cutting device (not shown) such as a knife or a laser cutter. Each tubular member 5 generally has a circumferential side wall 6 extending in the direction of the longitudinal axis of the tubular member, except for a first open end 7 and a second open end 8 at the opposite ends of the tubular member 5 The circumferential side wall 6 preferably has no openings or holes. Each open end 7 and 8 has a corresponding circumferential edge 7A and 8A. The tubular member 5 is made of a woven fabric, in particular a polymer material, preferably woven polyolefin or woven polypropylene material. Due to its equal flexibility, the tubular member 5 is substantially flat during the manufacturing process, as shown in the figure. In this flattened state, at least two opposing side wall sections 9A and 9B forming the tubular member 5 are formed with pleated side edges 6A and 6B between them and the like. In FIG. 1, since the tubular member 5 is shown in a plan view, only the top side wall section 9A can be seen.

Another alternative is that instead of cutting, it is of course possible to simply obtain the tubular member 5 from a stack or another production line for producing the tubular member 5. The step of cutting or simply obtaining the tubular member 5 may be generally referred to as a step of providing the tubular member or simply as step a). This step can be performed by a supply unit 101.

In a subsequent step (which may be referred to as step b)), and may be performed by a first closing unit 102), the first open end 7 of the tubular member 5 is completely closed so that the material filled into the bag 2 cannot be removed from the bag 2 Outflow from this side. Preferably, this is achieved by attaching a first sealing strip 10 to the first open end 7. For this purpose, the first sealing strip 10 can be cut from a continuous strip roll 11 or alternatively taken from a stack. The length of the first sealing strip 10 may be greater than the width of the first open end 7. There are various ways for attaching or joining the first sealing strip 10 to the first open end 7. However, welding or bonding is preferred. For this purpose, a bonding or sealing device 28, specifically a device using adhesives/adhesives (natural or synthetic) for bonding or using welding techniques (such as laser welding, ultrasonic welding or any other high frequency Welding), or a hot air welding device is preferred. This connecting device 28 may be included in the first closed unit 102.

The first sealing strip 10 preferably has two strip sections (not shown), one for each side wall section 9A (top side) and 9B (lower side) of the tubular member 5 connected to each other. Specifically, the cross section of the first sealing strip 10 forms a V or a U. The two strip sections of the first sealing strip 10 (ie the sides of the U or V profile) are thereby attached to the edge 12 of the first open end 7. Alternatively or additionally, the first sealing strip 10 at the first open end 7 can be sewn to the tubular member 5 because the load on the stitch at the first (upper) open end 7 can be less than Eight (lower) open ends.

Subsequently, in step c) (which is performed by one of the units commonly referred to as the valve forming unit 103), the valve 3 is formed in the tubular member 5. For this purpose, a corner 13 at the second open end 8 is folded inward to the inside of the tubular member 5. As seen in FIG. 1, after being folded inward, the corner 13 is immediately shaped into two isosceles triangles 14 with a common side or edge between them, and the common side is the first side 15 (The first corner). The first side 15 of the triangle 14 is thereby formed by a part of the side edge 6A and is oriented substantially in a direction perpendicular to a longitudinal axis 16 of the tubular member 5. Similarly, after folding inwardly, one of the second sides 17 (second right-angle side) of each triangle 14 is formed by a portion of the circumferential edge 8A. The second side 17 of each triangle 14 is oriented substantially in a direction parallel to the longitudinal axis 16 of the tubular member 5. Finally, the hypotenuse 18 of the triangle 14 is formed by pleating the side walls 9A and 9B.

Obviously, the integrity of the resulting valve 3 and the rest of the bag comes from the following facts: -The first side 15 of the triangle 14 is an integral part of the pleated side edge 6A; -The second side 17 of the triangle 14 is an integral part of the circumferential edge 8A; and -Beveled edge 18 is an integral part of side walls 9A and 9B.

Although the valve 3 has an integrality with the bag in the manner explained here, in order to prevent the valve from unintentionally spreading out (ie, as opposed to folding inward as previously explained), the device of the present invention is provided with a punching unit 108 .

After cutting the tubular member 5 from the mesh roll 4, in step e), at least one hole 29 is formed in at least one of the adjacent side wall sections 9A and 9B by means of the punching unit 108 (see FIG. 3), In order to establish a connection between the second sealing strip 25 and at least one of the side walls 19 of the valve 3. In the illustrated embodiment, two holes 29 are made. The two holes 29 may be in the same wall section 9A or 9B, or the like may be in different wall sections 9A or 9B. The holes 29 can be placed relative to each other in any configuration as long as the second sealing strip 25 (when placed in its final position) covers at least one of the holes 29. The punching of hole 29 must occur before step e) or at the beginning of step e). Therefore, the punching unit 108 can be placed anywhere in the device 1 as long as the hole 29 is punched before step e) or at the beginning of step e). The hole 29 may be a through hole passing through the two side wall sections 9A and 9B of the tubular member 5 and the two side walls 19 of the valve 3. Alternatively, it is sufficient if the hole 29 only passes through only one of the respective adjacent side wall sections 9A and 9B of the tubular member 5. In step e), a second welding device 28 (which may be part of a second closing unit 105) is used to finally attach the second sealing strip 25 to the second open end 8. Fusion or bonding systems are preferred, however, ultrasonic fusion can also be used.

As a result of attaching the second sealing strip 25 to the second open end 8, the side wall 19 of the valve 3 is connected to the second sealing strip 25 through the hole 29. Since the second sealing strip 25 is also connected to one of the respective side wall sections 9A or 9B at the second open end 8 of the tubular member 5, the side wall 19 of the valve 3 is connected to the adjacent side wall section via the second sealing strip 25 9A or 9B. The hole 29 is positioned close to the second open end 8 so that it can be completely covered by the second sealing strip 25.

FIG. 5 shows the punch unit 108 in a side view. The punching unit 108 includes a slidable bolt 30 that punches at least one hole 29, preferably two holes 29, through the side wall section 9 and the side wall 19 of the valve 3. A supporting element 31 supports the tubular member 5 and receives the bolt 30.

The position of the hole 29 may be predetermined depending on the size of the bag and the valve. Therefore, once it is known where to cut to make the tubular member 5 from the tubular mesh, in fact during the method (i.e., even before any of steps b, c, d, and e) can be at any The action of forming the hole 29 is performed at the point.

As an alternative to fixing the valve using the hole 29, at least one of the side walls 19 of the valve 3, preferably the edge of at least one of the side walls 19 of the valve 3 near the second open end 8 is firmly connected to One of the tubular members 5 is adjacent to the side wall sections 9A and 9B, respectively. This step can be performed by a unit that can be generally referred to as the valve connection unit 107 (see FIG. 3). Preferably, the two side walls 19 of the valve 3 are each connected to the respective adjacent side wall sections 9A or 9B of the tubular member 5. In one flat state of the tubular member 5, the side wall sections 9A and 9B are opposed to each other (see FIG. 2 or FIG. 5).

If by means of a welding procedure, in particular an ultrasonic welding procedure performed by a welding unit 106, the side wall 19 of the valve 3 is connected to the respective adjacent side wall sections 9A and 9B of the tubular member 5, then the valve 3 can be achieved One of the side walls 19 is connected quickly and reliably. This is shown in more detail in Figure 2. Through the welding process, the fabric of the tubular member 5 and the valve 3 formed therein are partially melted and the wall 19 of the valve 3 is connected to the respective adjacent sides of the tubular member 5 without using any adhesive material (such as an adhesive) Side wall sections 9A and 9B.

As already explained, preferably, the two side walls 19 of the valve 3 are connected to one of the tubular members 5 respectively adjacent to the side wall sections 9A or 9B. For this purpose, a separate welding procedure performed by the separate welding unit 106 may be used. The fusion splicing unit 106 may be activated simultaneously or sequentially. As shown in FIG. 4, the welding unit 106 may be integrated into the valve connection unit 107.

In order to avoid that the side walls 19 of the valve 3 are connected to each other, during the welding process, a separation element 20, in particular a separation layer 21 preferably made of steel, may be used to temporarily separate the side walls 19 of the valve 3 from each other. The separating element 20 has the advantage that the side walls 19 of the valve 3 are not accidentally welded to each other during the welding process.

Instead of welding, the side wall 19 of the valve 3 can be connected to the respective adjacent side wall sections 9A or 9B of the tubular member 5 by means of an adhesive material (which can be a natural or synthetic adhesive, preferably hot melt). This step can be performed by a bonding unit that can be integrated into the valve connection unit 107.

In still another embodiment, the device includes both the aforementioned punching unit 108 and the welding unit 106, the punching unit 108 is used to provide its purpose in the preferred embodiment and the welding unit 106 is used to At least one side wall of the valve is connected to one of the tubular members adjacent to the side wall section.

In step d) (which can be performed by a cutting unit 104 and can be followed by the valve forming unit 103 or the valve connecting unit 107), for example, by cutting off the tubular member 5 by means of a knife or another cutting device (not shown) At the second open end 8 is formed a lower edge strip 22 of one of the tubular members 5 of the valve 3. The cutting is preferably straight without any curved sections. Therefore, the resulting valve 3 has a height 23 shorter than its depth 24 in its final state. In other words: the height 23 of the valve 3 is reduced by the width of the lower edge strip 22 after cutting. The height 23 of the valve 3 extends in a direction parallel to the longitudinal axis 16 of the tubular member 5, and the longitudinal axis 16 of the tubular member 5 extends from the first open end 7 to the second open end 8. The depth 24 extends in a direction perpendicular to the longitudinal axis 16 of the tubular member 5. This improves the reliability of the self-closing mechanism of the valve 3 in the final bag 2 because it prevents the valve 3 from accidentally folding toward one of the outside in response to the filling of the material. The cutting of the lower edge strip 22 may be performed at a substantially right angle to the longitudinal axis 16 of the tubular member 5 and along the full width of the second open end 8 in which the valve 3 is formed.

After cutting the lower edge strip 22, in a step which may be referred to as step e), the second open end 8 is closed by attaching a second sealing strip 25 thereto. This step may be performed by the second closed unit 105, which may be similar to the first closed unit 102. In this regard, "closed" means that the second open end 8 is closed but the retention valve 3 is opened after the lower edge strip 22 is removed. In other words: the second open end 8 is closed, but the valve 3 is still open for receiving material. Again, the second sealing strip 25 can be obtained from a stack or, as shown, cut from a continuous strip roll 26. Similar to the first sealing strip 10, the second sealing strip 25 preferably has two strip sections, one for each side wall section 9A and 9B of the tubular member 5 connected to each other. Specifically, the cross section of the second sealing strip 25 forms a V or a U. The two strip sections of the second sealing strip 25 (ie the sides of the U or V profile) are thereby attached to the edge 27 of the second open end 8. Alternatively or additionally, the second sealing strip 25 at the second open end 8 can be sewn to the tubular member 5. The second sealing strip 25 may be bonded or preferably welded to the tubular member 5. For this purpose, another joining or sealing device 28 may be included in the second closing unit 105.

Since the second sealing strip 25 can be too long due to the presence of the valve 3 and protrude from the bag 2, a sealing strip cutting unit 109 can be placed at the end of the device 1. This unit 109 can cut off the portion of the second sealing strip 25 protruding above the valve 3.

The procedure explained above by means of the device 1 results in a closed first end (corresponding to the previous first open end 7) and a bag 2 in which a second end 8 of the valve 3 is formed. The second end 33 corresponds to the second open end 8 closed by means of the second sealing strip 25.

Preferably, the units 101, 102, 103, 104 and 105 shown in the figure are arranged in the order of 101, 102, 103, 104 and 105 in a production line.

The advantages of bags made using the methods and devices disclosed herein are obvious.

Although the above description contains many specificities, these specificities should not be construed as limiting the scope of the present invention, but merely as an example of preferred embodiments thereof. It must be recognized that modifications and changes can be made based on the disclosure given above without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should not be judged by the illustrated embodiments, but should be judged by the scope of the accompanying patent application and other legal equivalents.

1: device 2: bag 3: valve/integrated valve 4: Mesh roll/mesh/fabric roll 5: tubular/tubular member 6: circumferential side wall 6A: Side edge/pleated side edge 6B: Pleated side edges 7: first open end/open end/first (upper) open end/first open end 7A: First open end 8: second open end/second end/second (lower) open end/second open end 8A: Second open end/circumferential edge 9: Side wall section 9A: sidewall section/top sidewall section/side wall/wall section/layer of flattened tubular 9B: Side wall section/side wall/wall section/layer of flattened tubular member 10: first sealing strip 11: Continuous strip roll / strip roll used for the first sealing strip 12: The edge of the first open end 13: corner 14: Isosceles triangle/triangle 15: First side/first side or first straight side/first side of triangle 16: longitudinal axis / longitudinal axis of tubular parts 17: Second side/second side or second right-angle side/second side of triangle 18: hypotenuse/hypotenuse of triangle 19: Side wall/valve side wall/valve wall 20: Separate components 21: Separation layer 22: edge strip/lower edge strip 23: height/valve height 24: Valve depth/depth 25: second sealing strip 26: Continuous strip roll / strip roll for the second sealing strip 27: The edge of the second open end 28: connecting or sealing device/connecting device/second welding device/bonding device/welding device; connecting/sealing device 29: Hole 30: Sliding bolt/bolt 31: Support element 101: supply unit/unit/supply unit for tubular parts 102: first closed unit/unit/first closed unit for the first open end 103: Valve forming unit/unit 104: Cut off unit/unit 105: second closed unit/unit/second closed unit for the second open end 106: welding unit 107: Valve connection unit 108: Punch unit/Punch device 109: Sealing strip cutting unit/unit a): steps b): steps c): steps d): steps e): steps

Figure 1 shows a device for producing a bag with a safety valve. 1A and 1B show schematic diagrams of folds formed for making a valve. Fig. 2 shows a welding unit for connecting at least one side wall of a valve to a welding part of an adjacent side wall section of a tubular member by means of a welding procedure. Figure 3 shows an alternative device for producing a bag with a safety valve. Figure 4 shows the connection of the side wall of the valve to the adjacent side wall section by means of a single welding unit. Fig. 5 shows a punching unit in a side view.

1: device

2: bag

3: valve/integrated valve

4: Mesh roll/mesh/fabric roll

5: tubular/tubular member

6: circumferential side wall

7: first open end/open end/first (upper) open end

8: second open end/second end/second (lower) open end

9: Side wall section

10: first sealing strip

11: Continuous strip roll / strip roll used for the first sealing strip

12: The edge of the first open end

13: corner

14: Isosceles triangle/triangle

15: First side/first side or first straight side/first side of triangle

17: Second side/second side or second right-angle side/second side of triangle

18: hypotenuse/hypotenuse of triangle

22: edge strip/lower edge strip

23: height/valve height

24: Valve depth/depth

25: second sealing strip

26: Continuous strip roll / strip roll for the second sealing strip

28: connecting or sealing device/connecting device/second welding device/bonding device/welding device; connecting/sealing device

29: Hole

101: supply unit/unit/supply unit for tubular parts

102: first closed unit/unit/first closed unit for the first open end

103: Valve forming unit/unit

104: Cut off unit/unit

105: second closed unit/unit/second closed unit for the second open end

108: Punch unit/Punch device

109: Sealing strip cutting unit/unit

a): steps

b): steps

c): steps

d): steps

e): steps

Claims (28)

A method for manufacturing a storage bag (2) having a valve (3), the method comprising the steps of: providing a fabric, in particular a polymer material, preferably woven polyolefin or woven polypropylene material A tubular member (5), the tubular member (5) having a first open end (7) and a second open end (8), followed by preferably a first sealing strip (10) Attached to it to close the first open end (7) of the tubular member (5), the method is characterized in that these steps are followed by the following steps: a. The valve (3) of the bag (2) is formed by folding the corner (13) of the tubular member (5) inward at the second open end (8) to the inner side of the tubular member (5) ); b. Cut off an edge strip (22) of the tubular member (5) in which the valve (3) is formed at the second open end (8) thereof; and c. Close the second open end (8) by attaching a second sealing strip (25) to it. The method of claim 1, wherein the inwardly folded corner (13) used to form the second open end (8) of the valve (3) has the shape of a triangle (14). The method of claim 1 or 2, wherein step b) includes the tubular member (5) at a substantially right angle to a longitudinal axis (16) of the tubular member (5) and along which the valve (3) is formed ) The full width of the second open end (8) cuts the edge strip (22). The method of claim 1 or 2, wherein before step c), at least one hole (29) is made in the adjacent side wall section (9A and/or 9B), so that in step c) the second sealing strip (25) establishes a connection with at least one side wall (19) of the valve (3). Method according to claim 1 or 2, wherein after forming the valve (3) according to step a), at least one side wall (19) of the valve (3), preferably the side wall (19) of the valve (3) ) Is connected to one of the lateral edges of the tubular member (5) adjacent to the side wall section (9A or 9B). The method of claim 1 or 2, wherein by means of a welding procedure, in particular an ultrasonic welding procedure, the at least one side wall (19) of the valve (3) is connected to the respective of the tubular member (5) Adjacent to the side wall section (9A or 9B). The method of claim 6, wherein during the welding process, a separating element (20), in particular a separating layer (21) preferably made of metal, is used to separate the side walls of the valve (3) (19) Temporarily separated from each other. The method of claim 5, wherein the at least one side wall (19) of the valve (3) is preferably hot-melted by means of an adhesive material to the respective adjacent side wall sections of the tubular member (5) (9A or 9B). Method according to claim 1 or 2, wherein the first sealing strip (10) and/or the second sealing strip are bonded by means of welding, preferably hot air welding or ultrasonic welding, or bonding using an adhesive (25) Attached to the tubular piece (5). The method of claim 9, wherein the holes (29) are two or more in number and are configured in any relative configuration with respect to each other. The method of claim 10, wherein after closing the second open end (8), the second sealing strip covers at least one of the holes (29). The method of claim 1 or 2, wherein the first and second sealing strips are in the form of U or V segments. Method according to claim 1 or 2, wherein the first sealing strips (10) and/or the second sealing strips 25 are made of woven or non-woven materials, in particular polymer materials, preferably coated The cloth or laminated is preferably made of woven polyolefin or woven polypropylene material. A method as claimed in claim 1 or 2, wherein the first and second sealing strips are pre-applied with an adhesive on the other side of the bag that attaches itself to the bag. A storage bag (2) made of fabric material, characterized in that the bag includes: A tubular member (5) made of a fabric, in particular a polymer material, preferably woven polyolefin or woven polypropylene material, the tubular member (5) preferably by means of a first sealing strip (10) having a closed first end (32); A valve (3) formed by folding an angle (13) at a second end (8) of the tubular member (5) inward to the inner side of the tubular member (5), the valve (3) ) A height (23) is less than a depth (24) of the valve (3); A second sealing strip (25) is attached to the second end (8) of the tubular member (5). The bag as claimed in claim 15, wherein the wall sections (9A or 9B) have at least one hole (29) made in them covered by the second sealing strip (25). A bag according to claim 15 or 16, wherein at least one of the side walls (19) of the valve (3) is connected to one of the tubular members (5) adjacent to the side wall section (9). A bag as in claim 16, wherein the holes (29) are two or more in number and are configured in any relative configuration with respect to each other. A bag as claimed in claim 15 or 16, wherein the first sealing strips (10) and/or the second sealing strips 25 are made of woven or non-woven materials, in particular polymer materials, preferably coated The cloth or laminated is preferably made of woven polyolefin or woven polypropylene material. A bag as claimed in claim 15 or 16, wherein the first and second sealing strips are pre-applied with an adhesive on the other side of the bag that attaches itself to the bag. A device (1) for producing a storage bag (2) having at least one valve (3), characterized in that the device includes: a) A supply unit (101) for providing a tubular piece (5) made of fabric, in particular polymer material, preferably woven polyolefin or woven polypropylene material, the tubular piece (5) It has a first open end (7) and a second open end (8); b) a first closing unit (102) for closing the first open end (7) of the tubular member (5) in particular by means of a first sealing strip (10); c) A valve forming unit (103) for forming the bag (2) by folding inwardly a corner (13) of the second open end (8) to the inside of the tubular member (5) Valve (3); d) A cutting unit (104) for cutting an edge strip (22) of the second open end (8); e) A second closing unit (105) for closing the second open end (8) by means of a second sealing strip (25). The device (1) according to claim 21, wherein the device (1) further includes a punching unit (108) for closing the second open end (8) by means of the second closing unit (105), At least one hole (29) is punched in at least one side wall section (9A and/or 9B) of the tubular member (5), wherein the hole (29) is positioned such that when the second sealing strip (25) is attached At this time, a connection is established between the second sealing strip (25) and at least one side wall (9A or 9B) of the valve (3). The device of claim 21 or 22, wherein the punching unit is positioned at least upstream of the second closing unit (105). The device according to claim 21 or 22, wherein the first closing unit (102) and/or the second closing unit (105) has an adhesive device or a welding device (28) for applying the first sealing strip (10)/The second sealing strip (25) is connected to the first open end (7)/the second open end (8) of the tubular member (5), wherein the welding device (28) is preferably executable Hot air welding or ultrasonic welding. The device according to claim 21 or 22, wherein the device (1) further includes a bonding unit for connecting at least one side wall (19) of the valve (3) to the tubular member (5) by means of an adhesive One is adjacent to the side wall section (9A or 9B). The device according to claim 21 or 22, wherein the device (1) further comprises a welding unit (106) for assisting at least one side wall of the valve (3) by means of a welding process, preferably an ultrasonic welding process (19) An adjacent side wall section (9A or 9B) connected to one of the tubular members (5). The device of claim 21 or 22, wherein the welding unit (106) includes a separating element (20) that can be inserted between the side walls (19) of the valve (3) during the welding process, in particular A separation layer (21) preferably made of metal. The device of claim 22, wherein the punching device (108) has a slidable bolt (30) for punching the hole (29), and under the tubular member (5) when punching the hole (29) One supporting element (31) is provided.

Images