TWI771973B - An apparatus and a method for sealing open ends of bags with easily openable seam and a bag with easily openable seam - Google Patents

Abstract

Invention discloses a method and an apparatus for making easily openable seams at open ends of bags and bags with openable seams. The bags may be block-bottom, pillow-type, and with or without side gussets. For seaming the open end of the bag, the apparatus has been provided with a folding means (19) which comprises a folder (20) which is capable of receiving a flat closing strip (15) and converting it into a U-shaped closing strip (15A) having two arms (15B and 15C), and between which the open end is placed. The apparatus is also capable of receiving a seam opening strip (9) that is placed over the open end that is placed inside the U-shaped closing strip (15A) to form a composite open end (33A). The composite open end (33A) is sewn or stitched to form the easy-to-open seam. The seam is openable simply by pulling the seam opening strip (9).

Description

Apparatus and method for sealing the open end of a bag with an easy-open seal and a bag with an easy-open seal

The present invention relates to bags with openable closures and bags with openable closures produced using the method and apparatus. In particular, the present invention relates to a device for making an easy-open seal at the open end of a storage bag therewith and a method of making an easy-open seal at the open end of a storage bag. The apparatus and method of the present invention are used in the manufacture of a storage bag. The openable closures made using the apparatus and method of the present invention are easy to open.

Conventional woven packaging bags of various sizes and shapes are used in various situations. In the past, bulk materials such as flour, sugar, rice, seeds, animal feed, chemicals, powdered materials or the like, for example, have typically been packaged in woven plastic bags. Pet food, bird food, and other products sold in retail stores are often already packaged in plastic film bags, due to limitations in high speed requirements in filling and packaging operations that limit the use of woven bags in these applications.

In addition, pillow bags have the disadvantage that stacking of these bags is difficult and their high-speed filling on packaging lines is not possible because the stitching speed is generally lower than that of modern square-bottomed and valved bags. Line speed of the packaging system. As a further major disadvantage, some bags after encapsulation/stitching are not easy to open without the use of scissors, knives or any other sharp tool which will eventually damage the bag. Opening the bag with a sharp object of this type as defined above may also result in spillage of material, so care should be taken when opening this type of bag.

Presently, square bottom bags are known to quickly fill material by providing valves at the ends and also stack properly due to the square bottom shape or square shape. But the main disadvantage of this type of bag is that these bags are not easy to open. Therefore, there is a need to provide bags that overcome the aforementioned limitations and that are stackable, fill and close, and easy to open.

The term unsealable implies an easy-open seal. Thus, it is shown that the seals made using the apparatus and method of the present invention can be easily opened or need not be so laborious that the bag on which the seal is provided does not need to be torn in any way, including by using sharp tools such as knives, scissors, hooks or any other method involving sharp tools known to those skilled in the art).

In addition, there are developments such as coated woven polypropylene fabrics in the form of a two-layer structure on which a third layer of biaxial polypropylene film (BOPP) is applied, the third layer of biaxial polypropylene film Reverse printing can be done with high-end graphics suitable for consumer-type packaging. This multi-layer structure provides a stronger, more attractive bag than conventional bags used for that purpose. Due to their toughness, strong structure and good aesthetics, these multi-layer woven bags are usually sewn at both ends, making them impossible to reuse.

A number of prior art describe different kinds of easy opening techniques for opening bags.

US Patent 2008/0063322A1 ('322) discloses an easy-open, re-closable packaging mesh bag in which a pillow is tied in one end of the bag and has a drawstring at the other end so as to be perforated around the end of the mesh bag. It also describes an easy-open mechanism with stitches for sewing small cardboard tapes at the ends of the mesh bag. As apparent from Figs. 3A, 4A, et al., the invention ('322) relates to a pillow bag and not a square bottom bag. Furthermore, it is further apparent from the description given at paragraph 0008 of the invention ('322) that it relates to a mesh bag without any coating or BOPP laminate. Furthermore, the present disclosure does not disclose anything about how to achieve the easy-open technology.

A further example of a conventional woven plastic bag is disclosed in US Patent 4,373,979 ('979). The ('979) patent describes the use of a woven tape of highly longitudinally oriented, high density polyethylene or polypropylene in the construction of a bag formed from a stitched tube of self-woven plastic material. The suture tube has gussets on either side with two open unsealed ends. The patent ('979) describes the use of ultrasonic spot welding to seal portions of a bag made from these woven plastic tapes, rather than sewing a bag seal or using a hot melt adhesive to seal the pleat-forming gussets. The patent ('979) is hereby incorporated herein by reference. The patent ('979) purports to be an improvement on sealing a plastic bag. As described in the ('979) patent, sewing one end tends to take longer, thus increasing the time of the manufacturing process. In addition, the seamed end in a conventional bag tends to be a weak part of the bag and a potential location for tearing, tearing and subsequent loss of the contents during storage, shipping and handling.

Thus, the present invention overcomes the disadvantages of stacking, fast filling and easy closing and opening operations, and its multi-layer construction also allows for an attractive graphic display of the ends of the bag (eg front and back) at the retail store. In addition, an easy-open closure is provided for quick opening of the bag without the use of sharp tools.

Purpose of invention

The main object of the present invention is to provide a method and apparatus for manufacturing a woven packaging bag having a square bottom shape at least at one end.

Another object of the present invention is to provide a method and apparatus for manufacturing a woven packaging bag having at least one valve at one end.

Furthermore, it is an object of the present invention to provide an easy open seal on one end of the bag to make the bag easier to open.

Another object of the present invention is to provide a square bottom bag with an easy open seal for an easy upright stacking, quick filling and closing operation.

A further object of the present invention is to provide an apparatus for making easy-open seals on an automatic bag-making line operating at high speed.

The present invention provides a method and apparatus for manufacturing a storage bag with an easy-to-open easy-open seal and a bag with an easy-to-open easy-open seal. The bags may be square bottom type, may have a valve, or may be pillow type and made of a mesh sheet with more than one layer, including a front wall, a back wall, a first side wall, a second side walls, an inner surface, an outer surface, a top end and a bottom end. The mesh sheet includes a first layer made of a woven polymer or optionally non-woven polymer web and a second layer made of an adhesive coating or extrusion coating, the adhesive coating or extrusion coating The release coat 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 laminate film with high end graphics or printing such 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, as appropriate, non-woven polymer web upon which rests a second layer formed by coating. Furthermore, it is possible that the second layer includes a printing area so that printing can be performed using any of these known printing methods performed by the printer.

In an automatic bag making line, several procedures are carried out by which a tubular or a flat fabric is converted into a bag. Several stations are provided to carry out these procedures. Some of these stations are: Web roll feeding member in which woven or non-woven fabric rolls are loaded to feed the fabric in the forward direction Wire edge guiding and unwinding members, in which the fabric is guided over the rolls and unwound from the fabric roll Net fabric preparatory members, of which ○ The preparatory member optionally consists of a mesh perforation member that removes all air pockets between the layers of fabric for smooth operation ○ The preparatory components are composed of index hole punching components as appropriate ○ Net cleaning member Detection and sensing member, which senses the quality of the fabric Mesh cutting length cutting member, which cuts the fabric to the desired bag length Transport members, which transport the fabric towards the different bag making areas Transverse translation and guide/feed member that changes the orientation of the fabric from machine to cross for bag formation Defect-rejecting member, which repels defective fabrics prior to bag formation Top and bottom edge opening members in which one side of the top or bottom edge of the fabric is opened or folded ○ Edge open means vertical position ○ The opening member has a rotating mechanism Valve cushion storage, transfer and bonding components, in which a cushion is applied to a folded fabric prior to making the valve Folding member that folds the edge of the fabric with the valve pad to form a valve The further transport member will further transport the bag with the valve at one end to the further station Sewing member in which an openable closure is made at the open end of the bag Stacking member storage bags

Primary automation and control components refer to automated processes or high-speed delivery of bags using controlled processes

In the device of the present invention designed to provide an easy-open seal on a bag manufactured on an automatic production line, the seaming member (32) may be part of a separate seaming station suitably attached to the automatic production line. In particular, the device of the invention receives a cut sheet (1) of fabric with a sealed bottom formed at one of its two ends. At the open end of the bag, the device has an arrangement by which an easy-open seal is formed. For this purpose, a folding member (19) is provided in the device, the folding member (19) comprising a folder (20) capable of receiving a flat closure strip (15) and allowing the flat The closure strap (15) is converted into a U-shaped closure strap (15A) with two arms (15B and 15C) and is placed at the open end such that the open end is placed on the two arms (15B and 15C) )between. The device is also capable of receiving a seam opening tape (9) which is placed over the open end and which is placed inside the U-shaped closure band (15A) to form a composite Open end (33A). The composite open end is sewn or stitched to form an easy-to-open easy-open seal. The seal can be opened simply by pulling the seal opening strap (9). The stitching member (32) provides stitching with an easy-open mechanism using a conventional stitching member, wherein the tape closure refers to laying the tape over the bag and simultaneously stitching it with a stitching member known as a conventional stitching method, so that the final The user only has to pull on the strap to open the bag without too much effort and damage to the bag.

Furthermore, in one of these embodiments, the stitching mechanism by which the easy-open seal is formed can be defined as any such method of forming a seal so that it can be easily opened. A bag with this easy-open seal can be called an easy-open bag. This type of stitching mechanism can be tape stitching or zip lock or tape welding or bonding.

In another embodiment, a square bottom bag with an easy-open closure may be valveless at one end. Therefore, where pre-filling of the material takes place, a square bottom bag without a valve at one end is preferred, in which an easy-open seal can be made after filling.

The present invention also describes a method by which an easy-open or easy-open seal is formed at an open end of a bag on an automatic bag-making line. The method uses the apparatus disclosed herein. Finally, the present invention describes a bag provided with an easy-open seal which can be opened by pulling the seal opening strip (9).

The term fabric as used in this application is intended to encompass woven and non-woven fabrics, sheets or flexible films made of any material suitable for bag making. The fabric can be made from a mesh sheet having more than one layer. It comprises a first layer made of a woven polymer or, as the case may be, non-woven polymer web and a second layer made of an adhesive coating or extrusion coating 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.

Here, the apparatus and method of the present invention are described in terms of a square bottom bag with an easy-to-open seal. However, the device can be used on pillow bags or bags with gussets on the sides, or bags with a valve at one end, without any modification to the device.

Figure 1 shows a cut sheet (1) of a fabric made of a flat mesh tube or tubular multilayer mesh as shown in Figure 1A traveling from a cutting station to a folding station on a bag making line, where the fabric is At one end of the cut sheet (1), preferably at the bottom end (1B'), the cut sheet (1) is pulled on the sides and folded into an open base as shown in Figure IB. Folding of this type can be achieved by any electromechanical bag folding method. The cut piece (1) of fabric is advanced in the forward direction (shown by the arrow in Figure 1) in a manner of attaching a valve pad to the bottom end (1B') of the cut piece (1) of fabric, As shown in Figure 1C, wherein the valve pad can be applied by any known means, such as by gluing, gluing, hot air, welding, or any other such method that provides good adhesion.

In the course of subsequent steps, the bottom substrate is folded as shown in FIG. 1D and a cover gasket is applied as shown in FIG. 1E which forms a seal to be formed from a cut sheet ( 1 ) of fabric on the A square bottom bag (2) with a valve at one end. Next, the cut sheet (1) of fabric with a sealed square bottom formed at one end thereof is brought to a sewing station where a combination of folded and unfolded tapes are stacked on the cut fabric as shown in Figure IF on the top end (1A') of the sheet (1). At the same time, the bag (2) is sent so that the sealed ends are easy to open by any conventional sealing method, such as tape sealing by using a seaming member, as shown in Figure 1G.

Figure 2 shows a square bottom bag with a valve at one end, the square bottom bag having an easy-open seal, wherein the bag can be opened without damage or tearing it with any kind of sharp object.

In another embodiment, Figure 2 shows a bag of the present invention with an easy-open closure.

Those skilled in the art will understand and appreciate that bags in accordance with the present invention may vary in size, dimension and shape without departing from the scope of the present invention, and the foregoing description of preferred embodiments is not intended to be limiting as claimed by the invention The scope of the invention as defined by the scope of the patent. For example, those skilled in the art will understand and appreciate that the bag of the present invention may have sealed and sewn ends in a tubular bag having side gussets, or a base at both ends, or a base at one end and There is a pincushion at the other end, but not shown. Those skilled in the art will also appreciate that an easy-open closure can be provided in several ways that may differ from those expressly described and shown. Similarly, those skilled in the art will appreciate that terms such as "front" and "rear" and "top" and "bottom" are useful when describing a bag, but are inherently dependent on a The orientation of the bag and therefore the orientation of a bag is not limited.

Figure 3 shows a perspective view of the apparatus of the present invention showing one configuration of continuous bag making with easy open closure, with a square bottom valve on the other side of the cut piece (1) of fabric.

The square bottom bag (2) with valve at one end obtained after valve formation is further conveyed by upper and lower conveyor belts (4, 5) on a conveyor table (3) which is Attached to the main frame (7) which holds the bag (2) from the top and bottom and slides the fabric on the conveyor table (3). As the bag (2) advances, the spring (30) loads the pressure pad (6) (also shown in Figure 3A) to properly spread the square bottom bag (2) with a valve at one end over the conveyor table (2) in a straight line. 3) Above to avoid any misalignment or crease formation during the bag making process. These pressure pads (6) may be a piece or any other holding member that applies a sufficient pressure to hold a square bottom bag (2) with a valve at one end. The pressure applied to the bag (as shown in Figure 3A) can be controlled or monitored by the provided spring (30) configuration.

A square bottom bag (2) with a valve at one end is further transferred to the seam area by upper and lower conveyor belts (4, 5) to provide an easy-open seal. The stitching to the open end (1A') of the cut piece of fabric is carried out by superimposing the flat closure strip (15) with the U-shaped closure strip (15A), wherein the U-shape is formed by the folded member (19). At least one seam opening band (9) is superimposed on the U-shaped closing band (15A) so that the bag, the flat closing band (15) in the form of the U-shaped closing band (15A) and the closing opening band (9) form a composite (33) (as shown in Figure 5C). Next, the compound (33) is conveyed along the conveyor table (3) for simultaneous sewing by the sewing member (26).

In one of these embodiments, the width of the flat closure strip (15) can be of any size such that it covers the top open end (1A') of the cut piece of fabric from front to back during U-shape formation and is The width after folding is also sufficient so that the flap opening strip (9) can be overlaid on it and can be sewn (see Figure 6C).

In Fig. 3A, an enlarged view of Fig. 3 is seen from view 1, wherein the direction of movement of the flat closure belt (15) is shown.

In Figure 4, the device of the present invention is conveyed above the conveyor table (3) with square bottom bags (2) having a valve at one end.

In Figure 4A, a square bottom bag (2) with a valve at one end is moved by means of upper and lower conveyor belts (4, 5) to a flat closure belt (15) in the form of a U-shaped closure belt (15A) therein Cover the position of the bag (2) (shown in Fig. 5, Fig. 5B). The square bottom bag (2) with valve at one end is raised to a height just avoiding the lower bag end guide (25) so that it enters the folder body (20) so that it is positioned at the folder body (20) ) and near the lower lips (22, 23). The folder body (20) has a surface (20A) that supports the wider band during its advancement. Towards the end of the surface (20A), two lips, an upper lip (22) and a lower lip (23), are formed by bending the edge of the surface (20A). The positioning of the bag (2) in the vertical direction is controlled by the lower bag end guide (24) and the upper bag end guide (25), so that these guides (24, 25) act as a barrier to the bag (2) , so that the bags (2) move only between them. Once the bag (2) has been in the proper vertical position so that the bag (2) is over the folder body (20) and near the lower lips (22, 23), the folder body (20) will close the advancing flat belt (15) is formed with a U-shaped structure of the U-shaped closure tape (15A) to cover the open end (1A') of the cut piece of fabric and at the same time superimpose the seam opening tape (9) on the U-shaped flat closure tape ( 15) Above.

The U-shaped closure strip (15A) formed from the flat closure strip (15) by the folder body (20) is drawn from a second roll (14) and it is pulled by the sewing machine (26). From the second roll (14) the flat closure strip (15) rests on a guide rod (10) (shown in Fig. 3A), wherein a loop 2 (16) (shown in Fig. 3A) is provided to avoid flattening The closing strap (15) is dropped from the guide rod (10). Next, the flat closure belt (15) goes to the horizontal flange rollers (17) so that it changes its direction and moves in the direction of movement of the bag (2). Now, the flat closing belt (15) is transferred to the vertical flange rollers (18), which makes the belt vertical so that the plane of the flat closing belt (15) is now perpendicular to the plane of the conveyor table (3). After that, the flat closure strip (15) from the vertical flange roll (18) enters the folded member (19), which makes the flat closure strip (15) shaped like a U and the U-shaped cover strip (15A) covers the warp of the fabric The open end (1A') of the cutting blade.

At the same time, a seal opening tape (9) from a first roll (8) is provided through a guide rod (10) (shown in Figure 3A) fitted with a collar 1 (11) (shown in Figure 3A) to avoid The seal opening band (9) is dropped from the guide rod (10). The seal opening strip (9) goes to the guide 1 (12) (shown in Figure 3A) in order to properly align the seal opening strip (9). Furthermore, the flap opening strip (9) enters the guide 2 (13) (shown in Figures 5 and 5A) positioned above the folded member (19) to ensure the flap opening strip (9) and the self-flattening closure strip (15) The top surface of the resulting U-shaped cover tape (15A) is aligned so that it forms a pull-off element to open the bag (shown in Figure 2).

In one of these embodiments, the collar 1 and collar 2 (11, 16) (shown in Figure 3A) provided on the guide rod (10) can be of any shape, such as round metallic or non-metallic Element, flat or circular sheet or any other structure covering the seam opening (9) and the flat closing band (15) and acting as a barrier so that the seaming opening (9) and the flat closing band (15) do not Drop from the guide rod (10).

In another embodiment, guide 1 (12) (shown in FIG. 3A ) may be of a U-shaped configuration, wherein the width of guide 1 (12) is greater than the width of the seam opening band (9) such that the seam opening band ( 9) It can be easily passed through it without being damaged.

Furthermore, in another embodiment, the guide 2 (13) (shown in Fig. 5, Fig. 5A) is part of a folding member (19), which may also have an easy-moving flap opening (9) ) of the U shape or structure. It is preferred that the rounded edge be at the inner surface of the guide 2 (13) in order to move the closure opening band (9) smoothly without being damaged.

Once all three components, the square bottom bag (2) with valve at one end, the flat closure strip (15) folded in the form of a U-shaped closure strip (15A), and the seal opening strip (9) form a composite (33) The compound end (33A) (shown in Figure 5B). Once the composite end (33A) is formed, the seam opening tape (9) is then simultaneously stitched in the same direction of movement of the fabric bag (2) by means of the stitching member (26) on the square bottom bag (2) with a valve at one end ) and U-shaped closure strap (15A).

In Figure 4B, the stitched bag is removed from the stitching member (26) and conveyed to a cutter zone in which a cutter assembly (27) is provided. As the bags are advanced during the continuous production of the bags, the bags are well connected to each other by means of the flat closure strips (15) and the seal opening strips (9) and the seams. The cutter assembly (27) includes a blade (28) and a cylinder (29), wherein the blade (28), which can be any sharp object or cutting element, can be cut by heat such as hot, cold or ultrasonic in any way. Movement of the barrel (29) perpendicular to the direction of moving the bag facilitates movement of the blade (28), so vertical movement of the barrel (29) converts the movement of the blade (28) into rotation for engagement with the bag during the cutting procedure and during the cutting process. It is not necessary to disengage from the same blade (28) when cutting is not required. This movement of the blade (28) can also be performed by any commercially available electronics to provide rotational movement to the blade (28).

As shown in Figure 5, a folding member (19) is designed to rest the flat closure strip (15) over the open top end (1A') of the cut piece of fabric. This stacking can be done by making a flat closure strip (15) in the form of a U-shaped closure strip (15A) over the front and rear sides of the bag (2), which makes it possible to provide a path for the seal opening strip (9) , so that it can be aligned with the flat closure strip (15) and the square bottom bag (2) with a valve at one end. The folding member (19) includes a folder body (20), a lower bag end guide (24) and an upper bag end guide (25). A folder body (20) includes a flat first end (20A) through which a flat closure strip (15) passes into the folder body (20), whereby the folder upper lip (22) And the lower lip (23) of the folder converts the flat closure strip (15) into a U-shaped cover strip (15A). The folder body (20) also includes an adjustable bracket (21) attached to the base of the stitching member (26), wherein a slot is provided so that the folder body (20) is perpendicular to the moving bag (2) The direction is shifted to facilitate a wide range of lengths of the bag (2) that can be formed.

Figure 5A shows an enlarged view of, in particular, the folding member (19) of Figure 5, which also includes a pair of upper and lower bag end guides (25, 24) between which the bag end (1A) is formed ') travels through one of the guiding spaces G before entering the U-shaped closure belt (15A). The upper and lower bag end guides (25, 24) are linear members in the shape of plates, rods or rods and have a collecting surface at their upper ends.

In Figure 5B the bag (2) is shown with a flat closure strip (15) in the form of a U-shaped closure strip (15A) to form a composite (33) where the composite end (33A) is formed ) and thereafter the stitching procedure begins.

Figures 6, 6A and 6B show perspective views of different types of constructions of the folding member, wherein Figure 6 shows the folding member (19) comprising a folder body (20), guides 2 (13) and brackets (21) . The folder body (20) is constructed such that it has a first end (20A) that receives the flat closure strap (15), a second U-shaped end (20B) and covers from the first end (20A) and the second end The region of (20B) is a transition region (20C).

In another embodiment, the folder body includes upper and lower lips (22, 23) at the second end (20B) of the folder body (20), the upper and lower lips (22, 23) ) is formed by folding the longitudinal edges (20D, 20E). The flat closure strip (15) helps to form a U-shaped structure when passed through the lips (22, 23). Thus, the flat closure strip (15) is transformed into a U-shaped closure strip (15A) with two arms; namely the upper arm (15B) and the lower arm (15C) for resting the upper and lower surfaces of the fabric, respectively .

A guide 2 (13) is provided to guide the closure opening strip (9) so that it rests perfectly on the U-shaped closure strip (15A). A bracket (21) attached to the main frame (7) (as shown in Figure 3A) is provided to move the folding member (19) perpendicular to the direction of moving the bag (2) so that a modified opening feature can be created Bags (2) in the widest range of lengths.

Figure 6B shows a folding member (19) comprising a folder body (20) constructed such that it has smooth edges in an oval or slotted form to facilitate the flattening of the closure strip (15) A first end (20A) where movement becomes easy, and a U-shaped second end (20B) and a transition area (20C) covering the area from the flat first end (20A) and the second end (20B) . Here, the transition area ( 20C ) has a support sheet ( 31 ) which guides the flat closure strip ( 15 ) into the upper and lower lips ( 22 , 23 ) of the folder. The folder body also includes upper and lower lips (22, 23) at the second end (20B) of the folder body (20), the upper and lower lips (22, 23) being formed by folding the longitudinal edges ( 20D, 20E) to form. The flat closure strip (15) helps to form a U-shaped structure when passed through the lips (22, 23). Thus, the flat closure strip (15) is transformed into a U-shaped closure strip (15A) in which two arms; namely, an upper arm (15B) and a lower arm (15C) are used to rest the upper and lower surfaces of the fabric, respectively .

The method of forming an easy-open seal on a storage bag involves the following steps: a. Load the roll of woven or non-woven fabric on the roll feed member and move longitudinally in the direction of the conveyor table b. The mesh fabric is then guided over the roll by means of the mesh guide and unwinding member and unwound from the fabric roll c. Pass the mesh fabric over the fabric preparation member, where the mesh perforation member optionally removes any air pockets between the layers of the fabric for smoothing d. Cut the mesh fabric to the desired bag length by the mesh cutting member and transport the mesh fabric to different areas by the conveying member, provided that the fabric quality inspection of the mesh fabric is preferably carried out by the inspection member e. moving the bag to the seaming member (32), wherein an easy-open seal is constructed at the open end of the bag, characterized by: Supply the bag (2) with one end (1A') to be sealed on a conveyor table (3), Supplied with a flat closing strap (15) and a sealing opening strap (9), Pass the flat closure strip (15) through the folded member (19) to form a U-shaped closure strip (15A) with upper and lower arms (15B and 15C), Pass the bags (2) with open ends (1A') through the guiding space formed between the pair of upper and lower bag end guides (25, 24) before entering the U-shaped closure strip (15A) (G), Pass the closure opening strip (9) through the guide 2 (13) positioned above the flat second end (20B) to align the U-shaped closure strip (15A) within the depth of the upper arms (15B) a closure opening strip (9) to form a composite open end (33A) formed by the closure opening strip (9), the U-shaped closure strip (15A) and the open end (1A'), Use the seaming member (32) to make a seal through the composite open end (33A) to provide a bag with an easy-open seal. f. After stitching, transfer the bag to a stacking member where the bag is stored.

From the foregoing discussion, it is apparent that there are several embodiments of the present invention.

In a preferred embodiment, a device for sealing the end of a bag having an easy-open seal is disclosed. It is attached to a main frame (7) provided on a bag making line. The device includes: - a first roll (8), which unfolds the sealing opening tape (9); and a second volume (14), which unfolds a flat closing tape (15), - a conveyor table (3) which conveys bags (2) with open ends (1A'), - a set of vertical rollers (18), which change the orientation of the flat closed belt (15) to a vertical plane, - a folding member (19) that folds the vertically positioned flat closure strip (15) into a U-shaped closure strip (15A) of predetermined depths of its upper and lower arms (15B, 15C), wherein the folding member ( 19) Having a folder body (20), the folder body (19) having: a flat first end (20A), which receives the flat closure strip (15); and a second end (20B), which is Shaped into a U shape; a transition region (20C) from the flat shape at the first end (20A) to the U shape at the second end (20B); and an upper lip (22) and a lower Lips (23), which lead to the second end (20B), the upper lip (22) and the lower lip (23) by the distance between the longitudinal edges (20D, 20E) of the folder body (20) folded to form, - a pair of upper and lower bag end guides (25, 24) forming between them a guide space (G) through which the bag end (1A') travels before entering the U-shaped closure strip (15A) ), - a guide 2 (13) positioned above the second end to align the closure opening strip (9) within the depth of the upper arms (15B) of the U-shaped closure strip (15A) to form a The seal opening band (9), the U-shaped closing band (15A) and the open end (1A') form a composite open end (33A), - a suture member (32) forming a seal through the composite open end (33A).

In one embodiment, the depths of the upper and lower arms (15B and 15C) of the U-shaped closure strap (15A) are not equal.

In a further embodiment, the upper and lower bag end guides (25, 24) are linear members. These may be in the shape of plates, rods or rods and have a collecting surface at their upstream ends.

In yet a further embodiment, the first end (20A) of the folder body (20) is provided with an inlet loop through which the flat closure strip (15) is guided to the folder body (20). )superior.

In yet another embodiment, a support bracket (21) is provided to attach the folding member (19) to the main frame (7).

In yet a further embodiment, a guide rod (10) with a collar 1 (11) mounted thereon is positioned in the path of the seal opening band (9).

In another embodiment, a guide 1 (12) is provided in the form of a loop through which the seal opening band (9) is passed before passing through the guide 2 (13).

In yet another embodiment, the stitching member (32) is selected from the group consisting of a stitching machine, a tape stitching machine, a zip lock forming machine, a tape welding machine or a bonding machine.

The present invention also discloses a method of making a bag with an easy-open seal using the apparatus as disclosed herein. The method includes the following steps: a. Supply the bag (2) with one end (1A') to be sealed on a conveyor table (3), b. Supplied with a flat closure strap (15) and a seal opening strap (9), c. Pass the flat closure strip (15) through the folded member (19) to form a U-shaped closure strip (15A) with upper and lower arms (15B and 15C), d. Pass the bags (2) with open ends (1A') through the guides formed between the pair of upper and lower bag end guides (25, 24) before entering the U-shaped closure strip (15A) space (G), e. Pass the closure opening strip (9) through the guide 2 (13) positioned above the flat second end (20B) to align within the depth of the upper arms (15B) of the U-shaped closure strip (15A) the seam opening band (9) to form a composite open end (33) formed by the seam opening band (9), the U-shaped closing band (15A) and the open end (1A'), f. Using the seaming member (32) to make a seal through the composite open end (33) to provide a bag with an easy-open seal.

In one embodiment of the method disclosed herein, the depths of the upper and lower arms (15B and 15C) in the aforementioned step c are not equal.

In another embodiment of the method disclosed herein, the upper and lower bag end guides (25, 24) are linear members in the shape of plates, rods or rods and have a collecting surface at their upstream ends .

In yet another embodiment of the method, the first end (20A) of the folder body (20) is provided with an inlet loop through which the flat closure strip (15) is guided to the folder on the body (20).

In yet a further embodiment of the method of the present invention, a support bracket (21) is provided for attaching the folding member (19) to the main frame (7).

In a further embodiment of the method, the guide rod (10) on which the collar 1 (11) is mounted is positioned in the path of the seal opening band (9).

In another embodiment of the method, a guide 1 (12) is provided in the form of a loop through which the seal opening band (9) is passed before passing through the guide 2 (13) .

In yet another embodiment of the method, the stitching member (32) is selected from the group consisting of a stitching machine, a belt stitching machine, a zip lock forming machine, a belt welding machine or a bonding machine.

The present invention also discloses a bag made using the apparatus and method disclosed herein. It is apparent from the foregoing discussion that the bag is characterized as having an easy-to-open closure. In particular, the bag has an open end (1A') sealed with an easy-open seal. The easy-open closure includes a closure made through a composite open end (33A). The composite open end (33A) is formed at the end (1A') by superimposing at least one flap opening band (9) onto a U-shaped closing band (15A) having an upper and lower arm (15B and 15C) ) and wherein the open end (1A') is placed between the upper arm (15B) and the lower arm (15A) of the U-shaped closure band (15A). The bag of the present invention can be made from a coated woven polypropylene fabric that can be in the form of a two-layer structure on which is a third layer of bidirectional polypropylene film. Additionally, the bag may be of the square bottom type.

While the above description contains numerous details, these should not be construed as limitations on the scope of the invention, but as exemplifications 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 invention should be determined not by the illustrated embodiments, but by the scope of the appended invention claims and their legal equivalents.

1: Cut pieces of fabric 1A': Open top of the cut piece of fabric 1B': The open bottom end of the cut piece of fabric 1C': valve end of the cut piece of fabric 1D': The seamed end of the cut piece of fabric 2: bag 3: conveyor table 4: Upper part of conveyor belt 5: The lower part of the conveyor belt 6: Pressure pad 7: Main frame 8: Volume 1 9: Sealing and opening belt 10: Guide rod 11: Collar 1 12: Guide 1 13: Guide 2 14: Volume Two 15: Flat Closure Belt 15A: U-shaped closure strap 15B: Upper Arm 15C: Lower Arm 16: Collar 2 17: Horizontal Flange Roller 18: Vertical Flange Roller 19: Folding Components 20: Folder body 20A: Flat first end 20B: Flat second end 20C: Transformation Zone 20D and 20E: Longitudinal edge 21: Bracket 22: Folder upper lip 23: Folder lower lip 24: Lower bag end guide 25: Upper bag end guide 26: Suture components 27: Cutter assembly 28: Blades 29: Cylinder 30: Spring 31: Support sheet 32: Stitching Components 33: Complex 33A: Composite Open End

Figure 1 shows a procedure for making a bag with an easy-open seal.

Figure 1A shows a tubular fabric cut to a desired length.

Figure IB shows the bottom open end of the cut sheet of fabric pulled on one side and folded into an open base.

Figure 1C shows a valve gasket attached to the open folded base on one side.

Figure ID shows the folded edge with the valve in place.

Figure 1E shows a lid gasket seal on a folded edge with a valve.

Figure IF shows the top end of a cut piece of fabric with modified opening straps.

Figure 1G shows the top end of a cut piece of fabric with stitching to form an easy-open seal.

Figure 2 shows a bag of the present invention with an easy-open seal showing the openable end and the square bottom end.

Figure 3 shows a perspective view of the device of the present invention.

Figure 3A shows an enlarged view 1 of the device of the present invention.

Figures 4, 4A and 4B show perspective views of a device with different stages of bag formation utilizing an easy-open mechanism.

Figure 5 shows a perspective view of the folding member and mechanism used to form a releasable seal in a bag.

Figure 5A shows an enlarged view 2 of the folded member.

Figure 5B shows the composite form due to the folded member.

Figures 6, 6B show different types of constructions of the folding members.

Figure 6A shows a U-shaped closure strip formed from flat closure strips.

Figure 6C shows composite ends.

1A': Open top of the cut piece of fabric

2: bag

9: Sealing and opening belt

13: Guide 2

15: Flat Closure Belt

19: Folding Components

20: Folder body

21: Bracket

22: Folder upper lip

23: Folder lower lip

24: Lower bag end guide

25: Upper bag end guide

Claims (21)

A device for sealing the open end of a bag with an easy-open seal, attached to a main frame (7) and provided on a bag-making line, characterized in that the device comprises: a first roll (8), which unwinds a seam opening belt (9); and a second roll (14), which unwinds a flat closing belt (15), a conveyor table (3), which conveys an open end (1A') bag (2), a set of vertical rollers (18), which change the orientation of the flat closure strip (15) into a vertical plane, a folded member (19), which changes the orientation of the vertically oriented flat closure strip (15) Converted to a U-shaped closure strip (15A) of predetermined depth of its upper and lower arms (15B, 15C), wherein the folding member (19) has a folder body (20) having: a flat first end (20A) that receives the flat closure strip (15); and a second end (20B) that is shaped into a U-shape; a transition region (20C) from the first end The flat shape at (20A) transforms into the U shape at the second end (20B); and an upper lip (22) and a lower lip (23), etc. leading to the second end (20B), the The upper lip (22) and the lower lip (23) are formed by folding the longitudinal edges (20D, 20E) of the folder body (20), a pair of upper and lower bag end guides (25, 24), Formed between them is a guide space (G) through which the bag end (1A') travels before entering the U-shaped closure strip (15A), a guide 2 (13) positioned on the first The two ends are aligned with the sealing opening strip (9) within the depth of the upper arm (15B) of the U-shaped closing strip (15A) to form the sealing opening strip (9), the U-shaped closing strip (15A) ) and the open end (1A') form a composite open end (33A), a stitching member (32) that forms a seal through the composite open end (33A). The device of claim 1, wherein the depths of the upper and lower arms (15B and 15C) are not equal. The device of claim 2, wherein the upper and lower bag end guides (25, 24) are linear members in the shape of plates, rods or rods and have a collecting surface at their upstream ends. 4. The device of any one of claims 1 to 3, wherein the first end (20A) is provided with an inlet loop through which the flat closure strip (15) is guided to the folder body (20) superior. An apparatus as claimed in any one of claims 1 to 3, wherein a support bracket (21) is provided for attaching the folding member (19) to the main frame (7). A device as claimed in any one of claims 1 to 3, wherein a guide rod (10) having a collar 1 (11) mounted thereon is positioned in the path of the seal opening band (9). 4. The device of any one of claims 1 to 3, wherein a guide 1 (12) is provided which ties the seal opening strip (9) before passing through the guide 2 (13) Passed through a loop. The device of any one of claims 1 to 3, wherein the stitching member (32) is selected from the group consisting of a stitching machine, a belt stitching machine, a zip lock forming machine, a belt welding machine or a bonding machine. A method of sealing the open end of a bag with an easy-open seal using a device as claimed in any one of claims 1 to 8, characterized in that the method comprises the steps of: a. supplying on a conveyor table (3) bag (2) with one end (1A') to be sealed, b. supplying a flat closure strip (15) and a seam opening strip (9), c. passing the flat closure strip (15) through the folding member (19) to form a U-shaped closure strip (15A) with upper and lower arms (15B and 15C), d. to allow the bags (2) with open ends (1A') to enter the U-shaped closure strip (15A) ) before passing through the guiding space (G) formed between the pair of upper and lower bag end guides (25, 24), e. passing the seal opening tape (9) through the second end (20B) positioned on the flat ) above the guide 2 (13) to align the seal opening band (9) within the depth of the upper arm (15B) of the U-shaped closing band (15A) to form the seal opening band (9), the U Form closure strip (15A) and the open end (1A') to form a composite open end (33A), f. use a suture member (32) to make a seal through the composite open end (33A) for easy use The opening seal seals the open end of the bag. The method of claim 9, wherein in step c the depths of the upper and lower arms (15B and 15C) are not equal. A method as claimed in claim 9 or 10, wherein the upper and lower bag end guides (25, 24) are linear members in the shape of plates, rods or rods and have a collecting surface at their upstream ends. The method of claim 9 or 10, wherein the first end (20A) is provided with an inlet ring, the flat A flat closure strap (15) is guided through the inlet loop onto the folder body (20). The method of claim 9 or 10, wherein a support bracket (21) is provided for attaching the folding member (19) to the main frame (7). A method as claimed in claim 9 or 10, wherein a guide rod (10) having a collar 1 (11) mounted thereon is positioned in the path of the seal opening band (9). A method as claimed in claim 9 or 10, wherein a guide 1 (12) is provided through which the seal opening tape (9) is passed before passing through the guide 2 (13) One of the rings. The method of claim 9 or 10, wherein the stitching member (32) is selected from the group consisting of a stitching machine, a belt stitching machine, a zip lock forming machine, a belt welding machine or a bonding machine. A bag (2), characterized in that the bag (2) has one end (1A') sealed with an easy-open seal formed using the device of claims 1 to 8, wherein the openable seal comprises a A composite open end (33A) at the end (1A') is made into a seal, the composite open end (33A) being formed with at least one seam opening band (9), the at least one seam opening band (9) Stacked onto a U-shaped closure strap (15A) having an upper and lower arm (15B and 15C) such that the end (1A') is placed within the upper and lower arms (15B and 15C). 17. The bag of claim 17, wherein the closure uses a seaming member (32) selected from the group consisting of a seaming machine, a belt seaming machine, a zip lock forming machine, a belt welding machine, or a gluing machine to make. 18. The bag of claim 17 or 18, wherein the bag is made of a coated woven polypropylene fabric in the form of a two-layer structure with a third layer of bidirectional polypropylene film on top of the two-layer structure. The bag of claim 17 or 18, wherein the bag is of the square bottom type. 19. The bag of claim 19, wherein the two layers have a first layer made of a woven polymer or, as the case may be, nonwoven polymer web and a second layer made of an adhesive coating or extrusion coating , the adhesive coating or extrusion coating is made of any material such as polypropylene, polyethylene, polyethylene terephthalate, polyamide or any combination thereof, or paper.

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