JP2005153939A - Method and apparatus for shaping bag package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for shaping a bag package capable of shaping, from a rectangular-bottomed gusset bag package, a rectangular parallelopiped bag package with all of six surfaces flat including not only the rectangular bottom and four side faces but also the upper part of the bag package. <P>SOLUTION: The rectangular-bottomed gusset package 1 including a product packaged in a bag with gussets folded and upper and lower parts end-sealed is put in a shaping mold having regulation surfaces for the rectangular bottom and side faces. The upper end seal 4 and its vicinity 6 of the bag are preheated by a preheating member 10. The preheated upper end seal 4 is fallen toward the vicinity 6 by a keeping member 17, and also the package 1 is pressed by a keeping surface 18 of the keeping member 17 serving as the regulating surface to press the package 1 against the corresponding regulating surface of the shaping mold via the internal pressure of the bag, thereby shaping flat the six surfaces of the rectangular-bottomed gusset package 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for forming a bag package that can automatically form a bag package such as a pillow package into a rectangular parallelepiped shape.

  In a vertical bag making and filling machine such as a vertical pillow packaging machine, a bag bottom is generally formed by applying an end seal to a cylindrically formed packaging film with a center seal. A bag package in which a product to be packaged is charged or filled and an end seal is applied to a portion corresponding to the bag mouth portion to package the product in a pillow-shaped packaging bag is manufactured. By repeating the formation of the bag bottom and the sealing of the bag mouth, a bag package can be continuously produced. In order to improve the flowability and product display of the bag packaging body, it has been devised that the shape of the bag packaging body is close to a square shape, and in such a case, usually a cylindrical packaging film which is at least the bottom side of the bag A gusset fold is applied to this portion to form a square bottom gusset bag.

  In a vertical bag making filling and packaging machine, gusset folding is performed by pushing a pair of folding plates from the side into a cylindrical packaging film, and the gusset folding packaging film is put in that state by an end sealer. By providing the end seal, a square bag bottom is formed. In this case, since the gusset folds are usually simultaneously applied to the upper part of the bag formed in advance, the square bottom gusset bag package in which the upper part of the bag is also formed smart can be manufactured. To flatten the square bottom with gusset folds, fill the bag with the product and flatten the bag bottom according to the weight and bulk of the product, or more actively blow air into the bag or bag It has been proposed to perform an expansion operation on the expansion tool inserted therein. According to this vertical bag making filling and packaging machine, square bottom gusset bag packaging can be continuously manufactured, and when packaging a large number in a cardboard box for distribution or display as a product in a store, Can improve the sitting.

  In the square bottom gusset bag package manufactured in this way, only the portion of the square bottom and the four side surfaces adjacent to the square bottom adjacent to the square bottom exhibits a flat bag surface. Although the upper part of the bag package is provided with a gusset, there is no significant difference from the shape in the case of pillow packaging. Therefore, such a square bottom gusset bag package still has room for improvement in improving the accommodation efficiency in the box in the distribution stage and preventing the loss of shape. Or when displaying such a square bottom gusset bag packaging body at a shop front, stacking is difficult and there are restrictions, such as a display form being practically limited to one step.

Therefore, as a further processing of the bag neck including the upper end seal portion of the square bottom gusset bag packaging body, a proposal has been made to fold the bag neck and tape it to the bag surface or to wrap the bag neck and tape it. ing. According to this proposal, it is possible to reduce the bulkiness of the square-bottom gusset bag package and to improve the storage efficiency in the storage box and the accumulation form in the distribution stage (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2001-18906 (paragraphs [0019] to [0020], [0032], FIGS. 1 and 9)

  However, the process of bending or entraining the upper end seal part can reduce the bulkiness and improve the accommodation form or the display form, but the upper part of the square bottom gusset bag package is not necessarily flat and is still improved. There is room for. Therefore, in the formation of the bag packaging body for forming the square bottom gusset bag packaging body, by using the pressure inside the bag, forming the flat surface not only on the square bottom surface and the side surface in the vicinity thereof, but also on the top, However, there is a problem to be solved in that it is formed into a flat rectangular parallelepiped shape.

  An object of the present invention is to form a rectangular parallelepiped bag packaging body in which all six sides are flat from the square bottom gusset bag packaging body, including not only the square bottom and the four side surfaces but also the upper part of the bag packaging body. It is an object of the present invention to provide a bag packaging body forming method and apparatus that enable the above.

  In order to solve the above-mentioned problems, a bag packaging body forming method according to the present invention includes a square bottom gusset packaging body in which a product is packaged in a bag whose upper and lower portions are end-sealed in a gusset folded state. The upper end seal portion and the vicinity thereof are preheated by a preheating member and stored in a molding frame having a restriction surface for a square bottom surface and a side surface connected to the square bottom, and the preheated upper portion The end seal portion is tilted to the preheated vicinity side, and the pressing surface of the pressing member is used as a regulating surface for the upper surface of the square bottom gusset packaging body, and the square bottom gusset packaging body is moved into the mold by the pressing member. The square bottom gusset packaging body is flattened by pressing the square bottom surface, the side surface, and the square top surface against the corresponding regulating surfaces of the molding frame and the pressing member. The upper end seal portion is preheated while forming consists to tacking seal on the vicinity.

  According to this bag package forming method, the product is put into and filled in a bag whose bottom and top are end-sealed in a square bottom gusset package. First, such a square bottom gusset package is molded. Housed in a formwork. At that time, the square bottom surface of the square bottom gusset packaging body and the side surface connected to the square bottom surface are substantially regulated by the respective regulation surfaces provided in the molding frame. Next, the upper end seal portion of the bag and the vicinity thereof are preheated by the preheating member. Next, the preheated upper end seal part is brought down to the preheated vicinity side, and the square bottom gusset packaging body is pressed in the molding frame while pushing the upper end seal part by further pressing operation by the pressing member. . By this pressing, the pressure in the bag is increased, and the square bottom surface and the side surface of the square bottom gusset packaging body are pressed against the corresponding regulation surface of the molding frame via the pressure inside the bag. At this time, the pressing surface of the pressing member is a regulating surface on the upper surface of the square bottom gusset packaging. Since the holding member presses the preheated upper end seal portion that has been defeated in the vicinity of the preheated portion when pressing, the upper end seal portion performs the pressing operation for forming the square bottom gusset package. It can be used for the operation of temporarily fixing and sealing in the vicinity, and the process can be simplified. Therefore, the square bottom gusset packaging body is formed into a bag packaging body that is flat on all six sides by the pressing member and the forming mold. The square bottom surface can be flattened by the pressure inside the bag, but in order to achieve a more complete flattening, it is preferable to make it flat to some extent by bending it in advance to the bag side.

  In order to solve the above problems, a bag packaging body forming apparatus according to the present invention accommodates a square bottom gusset packaging body in which a product is packaged in a bag having end seal portions sealed in a gusset folded state at upper and lower portions. A mold frame having a regulating surface for the square bottom of the square bottom gusset package and a side surface connected to the square bottom, and the square bottom gusset package accommodated in the mold frame The pre-heated upper end seal portion having a pressing surface as a regulating surface for the upper surface of the upper end seal portion of the bag and the vicinity thereof, and a preheating member for preheating the vicinity thereof, and a square upper surface of the square bottom gusset packaging body By pressing the square bottom gusset packaging body in the molding frame by pressing the square bottom gusset packaging body in a state where the square bottom gusset packaging body is tilted to the vicinity side, and the square bottom, the side surface and the corner top surface of the square bottom gusset packaging body. The above A pressing member that presses against the corresponding regulating surfaces of the molding frame and the pressing member via the internal pressure, and temporarily seals the preheated upper end seal portion in the vicinity. Yes.

  According to this bag packaging body forming apparatus, the product is put and filled into a bag whose upper and lower parts are end-sealed in a folded state of the gusset, and a square bottom gusset packaging body is manufactured. Contains the package. At this time, the square bottom face of the square bottom gusset packaging body and the side surface connected to the square bottom face are substantially regulated by the respective regulation surfaces provided in the molding frame. The preheating member preheats the upper end seal portion of the bag and the vicinity thereof with respect to the square bottom gusset package accommodated in the forming mold. The pressing member presses the square bottom gusset package in the molding frame while pressing the upper end seal portion that is tilted to the preheated vicinity. By this pressing, the pressure in the bag increases, the pressing surface of the pressing member acts as a regulating surface on the upper surface of the square bottom gusset packaging body, and the bottom surface and side surfaces of the square bottom gusset packaging body through the pressure inside the bag. Is pressed against the corresponding regulating surface of the mold. The presser member presses the preheated upper end seal part in the vicinity of the preheated part when it is press-molded, so if the packaging material is weldable, it is necessary to form a square bottom gusset package. This pressing operation can be used for temporarily fixing the upper end seal portion in the vicinity, and can contribute to simplification of the process and reduction of the number of parts at the same time. Therefore, the pressing member and the forming mold form the square bottom gusset packaging body into a bag packaging body that is flat on all six sides. The pressing member can also be used as a member that tilts the preheated upper end seal part to the preheated vicinity.

  In this bag packaging body forming method, the square bottom gusset packaging body is formed by bending a packaging film into a cylindrical shape by a bag-making cylinder and guiding the outside of a filling cylinder arranged inside the bag-making cylinder. The cylindrical packaging film formed into a cylindrical packaging film by applying a seal, the product is put into the cylindrical packaging film through the inside of the filling cylinder, the product is filled and the gusset is folded from the side Can be manufactured by a vertical bag-filling and packaging machine that individually cuts and individually cuts, and can be cut individually and the square-bottom gusset package can be accommodated in the molding frame. Further, in this bag packaging body forming apparatus, a bag-making cylinder for forming and guiding the packaging film into a cylindrical packaging film is disposed inside the bag-making cylinder, and the cylindrical packaging film passes outside and is packaged. A filling cylinder into which a product to be dropped is dropped, a center sealer for performing a center seal on the tubular film, and an end sealer / cutter for performing an end seal and cutting the tubular packaging film filled with the product It can be applied to the discharge side of the vertical bag making filling and packaging machine provided. By combining the bag packaging body molding according to the present invention with the vertical bag making filling packaging, the square bottom gusset packaging body continuously produced by the vertical bag making filling packaging is sequentially accommodated in the molding frame, Everything can be molded into a flat bag package. In other words, it is possible to continuously manufacture high-value-added square-bottom gusset packaging using the structure of a basic vertical bag-filling and packaging machine that has conventionally existed, such as a vertical pillow packaging machine. it can.

  In the bag packaging body forming apparatus combined with the vertical bag making filling and packaging machine, the molding frame body includes a bottom surface regulating surface for regulating the square bottom of the square bottom gusset packaging body among the regulating surfaces. A front and rear side surface regulating surface for regulating the side surface facing the opposite side of the square bottom gusset package, and a frame member attached to a conveyor; and the remaining of the square bottom gusset package The left and right side surface regulating surfaces for regulating the side surfaces facing the opposite side are formed, and the guide body is arranged on both sides of the conveyor, and the carry-in portion of the conveyor is the vertical bag making The square bottom gusset package, which is disposed on the discharge side of the filling and packaging machine and cut by the end sealer cutter, is sequentially fed into the continuous forming frame. The vertical bag making filling and packaging machine discharge by forming the forming frame body continuously by the frame members provided in relation to the conveyor arranged on the discharge side of the vertical bag making filling packaging machine and the guide bodies on both sides The square bottom gusset package that is continuously discharged from the side is sequentially sent to the forming frame, and all six sides are sequentially formed into a flat bag packaging by the regulating surface of the forming frame and the regulating surface of the holding member during conveyor conveyance. Can be molded.

  In a bag packaging body forming apparatus combined with a vertical bag making filling and packaging machine, a lower end seal portion of the bag packaging body is bent to the bag side below the end sealer / cutter to preform the square bottom surface. A folding tool can be provided. The folding tool is operated before the square bottom gusset package sealed and cut with the end sealer / cutter is discharged from the vertical bag filling and packing machine so that the lower end seal portion overlaps the adjacent bag portion. And can be preformed to a shape close to a flat square bottom.

  In this bag package forming method, the filling cylinder is a rectangular filling cylinder having a rectangular cross section, and the tubular packaging film has a traveling portion of the cylindrical packaging film at a portion corresponding to a corner of the rectangular filling cylinder. A hem seal is applied along the direction, and the square bottom gusset package can be formed into a rectangular parallelepiped package with a hem seal. In the bag packaging body forming apparatus, the filling cylinder is a rectangular filling cylinder having a rectangular cross section, and a hem seal is applied to the tubular packaging film along the corner corresponding to the corner of the square filling cylinder. A hem sealer can be provided. The filling cylinder is a square filling cylinder, and the square gusset packaging body is made into a six-sided flat bag packaging body by applying a hem seal along the running direction to the cylindrical packaging film portion corresponding to the corner of the square filling cylinder. When molded, it is possible to obtain a rectangular parallelepiped package having a good shape retaining property in which a part of the side is reinforced with a hem seal.

  Since the bag packaging body forming method and apparatus according to the present invention are configured as described above, the fluid pressure can be increased in the bag packaging body while the outside of the bag packaging body is regulated by the regulating surface. By forming from the inside and the outside using a square bottom, the rectangular bottom gusset bag packaging body has a rectangular parallelepiped shape in which all six sides including the upper part of the bag packaging body as well as the square bottom and the four side surfaces are substantially flat. A bag package can be formed by a simple method and an apparatus structure. In addition, it has a high added value by simply performing an additional molding action on the vertical bag making and filling by a conventional vertical bag making and filling machine such as a vertical pillow packaging machine. A rectangular parallelepiped bag packaging body having all surfaces substantially flat can be formed.

  Hereinafter, embodiments of a bag packaging body forming method and apparatus according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a process diagram for explaining the outline of the bag packaging body forming method according to the present invention. The upper right of FIG. 1 is a schematic front view of the vertical bag making and filling machine 20, and details thereof will be described later with reference to FIG. The middle part of FIG. 1 is a process diagram viewed from the side, and the lower part is a process diagram viewed in the transport direction. FIG. 2 is a perspective view showing an outline of a bag package forming apparatus according to the present invention. In FIG. 2, the square bottom gusset bag package 1 continuously manufactured by the vertical bag making and filling machine 20 has a pair of end seals that are close to each other in the state where the gusset is folded from both sides. It is cut off by a cutter at the intermediate position, and separated individually. Of the pair of end seal portions, the upper end seal portion becomes the lower end seal portion 3 of the bag 2, and the lower end seal portion becomes the upper end seal portion 4 of the bag 2. In the lower part of the square bottom gusset bag packaging body 1, as will be described later, the lower end seal portion 3 is folded up on the bag 2 side and overlapped in the vicinity 5, and is formed into a square shape. It is assumed that such molding has been performed. Further, at the stage of being separated individually, the upper end seal portion 4 remains in the state at the time of seal molding, and the subsequent molding has not yet been performed.

  In FIG. 1, the square bottom gusset bag packaging body 1 is in a state of being housed in a molding frame (not shown) in the process of being sequentially conveyed from (a) to (d) in the side view. At the preheating position shown in (b), as shown in the lower step (b ′), the upper end seal portion 4 and the vicinity 6 of the bag 2 constituting the square bottom gusset packaging body 1 are preheated by the preheating member 10. . The preheating member 10 has a length equal to or greater than the full width w of the upper end seal portion 4 in order to allow preheating over the full width w of the upper end seal portion 4. The preheating member 10 includes a first preheating surface 11 for preheating the upper end seal portion 4 and a second preheating surface 12 for preheating the vicinity 6 of the upper end seal portion 4. The first preheating surface 11 is formed from an elongated flat end surface of the preheating member 10 in accordance with the shape of the upper end seal portion 4. On the other hand, the second preheating surface 12 is an inclined surface extending close to the first preheating surface 11 and preferably continuously connected in accordance with the shape of the shoulder portion of the bag 2 that is smoothly inclined from the upper end seal portion 4. Is formed.

  As shown in step (b ′) of FIG. 1, the preheating member 10 is between a preheating retreat position P1 that has retreated from the bag 2 and a preheat advance position P2 that preheats the upper end seal portion 4 and its vicinity 6. It is possible to advance and retreat. At the preheating retreat position P1, the first preheating surface 11 and the second preheating surface 12 are not in contact with the upper end seal portion 4 and the vicinity 6 thereof, respectively, so that preheating is not performed, but at the preheating advance position P2, the first preheating surface P2 is not performed. 11 contacts the upper end seal portion 4 and the second preheating surface 12 contacts the vicinity 6 to preheat them. In order to ensure the preheating action by the preheating member 10, it is preferable to arrange the receiving member 15 at a position where the upper end seal portion 4 is sandwiched between the preheating member 10. When the preheating member 10 has advanced to the preheating advance position P2, the upper end seal portion 4 is sandwiched between the end surface 16 of the receiving member 15 by the backing action of the receiving member 15, and the upper end seal portion 4 is reliably preheated. be able to.

  In the folding position shown in the step (c) conveyed by one step from the preheating position shown in the step (b) in FIG. 1, the upper surface of the square bottom gusset packaging body 1 is formed flat and a molding frame 30 (FIG. 2) described later. In order to form the other five surfaces in a flat manner in cooperation with reference and details will be described later, a pressing member 17 is provided. The pressing member 17 includes a pressing surface 18 that presses the square bottom gusset packaging 1 from above to the direction of the bag 2, that is, downward. In this example, the pressing member 17 is a flat plate material, and the pressing surface 18 is formed by a lower surface of the plate material facing the bag 2 side.

  As shown in the step (c ′) of FIG. 1, the pressing member 17 includes a pressing and retracting position P <b> 3 in which the end portion 17 a is retracted to at least a position where it can come into contact with the upper end seal portion 4, and the square bottom gusset packaging body 1. It is possible to move forward and backward with the presser advance position P4 that presses. The holding member 17 moves obliquely downward while tilting the upper end seal portion 4 toward the vicinity 6 side after the end portion 17a abuts on the upper end seal portion 4 at the holding backward position P3. In the step (c ′), a state in which the upper end seal portion 4 is bent during the movement is shown. In the pressing member 17, the pressing surface 18 presses the square bottom gusset packaging 1 at the pressing advance position P <b> 4. The preheated upper end seal portion 4 is pressed against its preheated vicinity 6 to form a weak seal such as a temporary seal (for example, an easily peelable seal that can be easily removed by a consumer). ), And a rectangular parallelepiped shape can be maintained. The details of the molding of the square bottom gusset packaging body 1 in cooperation with the molding frame body of the pressing member 17 will be described later including the explanation of the molding frame body. The means for tilting the upper end seal portion 4 toward the vicinity 6 is used as the pressing member 17 here, but a dedicated tilting member different from the pressing member 17 may be used.

  As shown in step (d) in FIGS. 1 and 2, when the square bottom gusset package 1 formed by the pressing member 17 moves to the next cooling step, the cooling plate 19 is applied from above. By applying the cooling plate 19, heat is removed from the upper end seal portion 4 which has been preheated and is still in a high temperature and its vicinity 6, and the portion where the weak seal is applied can be cooled. The rectangular parallelepiped square bottom gusset package 1 that has undergone the cooling step is carried out of the conveyance path.

  Next, with reference to FIG. 2, the vertical bag making filling packaging machine 20 combined with the bag packaging body forming apparatus according to the present invention will be described. The vertical bag-making filling and packaging machine 20 includes a bag-making cylinder 21 (see FIG. 1) for forming and guiding a flat web-like packaging film Fw into a cylindrical packaging film Ft, and a cylinder that is disposed inside the bag-making cylinder 21. The packaging cylinder 22 in which the packaged packaging film Ft passes outside and the product to be packaged is dropped inside, the center sealer 23 for performing a center seal on the cylindrical packaging film Ft filled with the product, and the product are introduced An end sealer / cutter 24 is provided for end sealing and cutting the cylindrical packaging film Ft. In the vertical bag making filling and packaging machine 20, since the filling cylinder 22 is configured as a square cylinder in cross section, the cylindrical packaging film Ft is also formed into a shape following the shape of the square cylinder in cross section. The bag packaging body forming apparatus is applied to the discharge side of the vertical bag making and filling machine 20. By combining the bag packaging body forming apparatus with the vertical bag making filling and packaging machine 20, the square bottom gusset packaging body 1 continuously manufactured by the vertical bag making filling and packaging machine 20 is sequentially placed in a molding frame 30 to be described later. And can be formed into a rectangular parallelepiped bag packaging body 1a that is flat on all six sides. The square bottom gusset packaging body 1 with high added value can be continuously manufactured using the structure of the basic vertical bag making and filling and packaging machine 20 that has conventionally existed.

  In relation to the vertical bag making filling and packaging machine 20, each portion of the cylindrical packaging film Ft that runs through the four corners of the filling cylinder 22 configured as a square filling cylinder has a surplus packaging film. Hem sealers 25a to 25d (25c is not shown on the back side of the filling cylinder 22) are provided with hem seals 7a to 7d (7c is not shown because it becomes a shadow) by overlapping the portions, and along each corner. It is arranged. By applying hem seals 7a to 7d to each of the four corners, when the square bottom gusset packaging body 1 is formed into a six-sided flat, a part of the sides of the square bottom gusset packaging body 1 is reinforced by the hem seals 7a to 7d. It can be formed into a rectangular parallelepiped package 1a with good shape retention. Further, a pair of paper feed belts 26 a and 26 b are disposed on the opposite side of the filling cylinder 22 in relation to the vertical bag making filling and packaging machine 20. The cylindrical packaging film Ft can be run reliably and stably by sandwiching the cylindrical packaging film Ft between the paper feeding belts 26a, 26b and the filling cylinder 22.

  Next, the forming frame 30 will be described with reference to FIGS. 1 and 3. FIG. 3 is a side view showing a conveyor constituting the bag packaging body forming apparatus according to the present invention and a forming frame attached thereto. In this embodiment, the forming frame 30 is configured in relation to a conveyor 31 extending horizontally from a lower position on the discharge side of the vertical bag making filling and packaging machine 20. The conveyor 31 is configured as a chain conveyor, and includes a plurality of sprockets 32a, 32b, and 32c and chains 33a and 33b wound around these sprockets. By forming the forming frame 30 continuously on the conveyor 31 at regular intervals, the square bottom gusset packaging 1 can be continuously received and formed. A part of the regulation surface of each forming frame 30 is provided by frame members 34 and 35 attached to the chains 33a and 33b of the conveyor 31, respectively. That is, one frame member 34 constituting each molded frame body 30 has an L-shaped cross section, and includes a bottom surface regulating surface 35 for regulating the square bottom of the square bottom gusset packaging body 1, A front side regulating surface 36a for regulating one of the side surfaces of the gusset packaging body 1 facing the front-rear direction is provided. The other frame member 35 constituting each forming frame body 30 also has an L-shaped cross section, but only the rear side surface regulating surface 36b for regulating the other side surface facing the front-rear direction is provided. . Since the frame members 34 and 35 have a size and a shape that enter the inside surrounded by the protruding hem seals 7a to 7d, the frame members 34 and 35 can reliably contact the side surface in the front-rear direction of the square bottom gusset package 1. is there. The frame member 34 and the frame member 35 are separately attached to the chain 33a and the chain 33b, respectively. By changing the phase difference between one chain 33a and the other chain 33b, the distance between the front side restricting surface 36a and the rear side restricting surface 36b can be increased in accordance with the change in the size of the square bottom gusset packaging body 1. Can be adjusted.

  As shown in section in steps (b ′) to (d ′) in FIG. 1 and in phantom lines in FIG. 2, a pair of guide bodies 37 a and 37 b arranged on both sides of the conveyor 31 are Left and right side surface regulating surfaces 38a and 38b for regulating side surfaces facing the opposite sides of the square bottom gusset package 1 are provided. When the pair of guide bodies 37a and 37b shown in FIG. 2 move forward to the positions indicated by the arrows at both ends, the left and right side regulation surfaces 38a and 38b are in the regulation positions that regulate the side surfaces of the square bottom gusset packaging body 1. Occupy. The remaining restricting surface is the pressing surface 18 of the pressing member 17 as described above. The bottom-bottom gusset packaging body 1 cut by the end sealers / cutters 24a and 24b is arranged in order on the discharge side of the vertical bag-filling / packaging machine 20, and the vertical bag-making / packaging machine 20 are continuously dropped from the outlet of the molding frame 30 and fed into the molding frame 30, and the regulation surfaces 35, 36 a, 36 b, 38 a, 38 b of the molding frame 30 and the regulation surface (pressing surface) of the pressing member 17 during conveyor conveyance. 18, all six sides are sequentially formed into a flat rectangular bag package 1a.

  FIG. 4 is a side view showing an outline of a bending tool for preforming a square bottom surface of a square bottom gusset package. As shown in FIG. 4, in the bag packaging body forming apparatus combined with the vertical bag making filling and packaging machine 20, the lower end seal part 3 of the bag packaging body is placed on the bag side below the end sealers and cutters 24a and 24b. There is provided a bending tool 40 which is bent into two and the square bottom surface is preformed. The bending tool 40 is composed of a bending plate whose one end 42 is pivotally attached to the lifting frame 41. A cylinder mechanism 45 for operating the bending tool 40 is pivotally attached to the lifting frame 41 on the cylinder 46 side, and a tip end portion of the piston 47 is pivotally attached to a bracket 44 provided on the back side of the bending tool 40. Yes. The elevating frame 41 is attached to a slider 48 guided along a vertical guide 49, and is moved up and down in synchronization with the operation of the vertical bag making filling and packaging machine 20 by an elevating mechanism (not shown). In other words, the folding tool 40 is raised before the square bottom gusset package 1 sealed and cut by the end sealers / cutters 24a and 24b is discharged from the vertical bag-filling / packaging machine 20. At the same time, when the cylinder mechanism 45 is actuated, the piston 47 advances, the bending tool 40 rotates to the horizontal position around the one end portion 42, and the upper flat surface 43 moves the lower end seal portion 3 near the bag. 5 is folded so as to overlap, and the lower part of the bag wrapping body is preformed to a shape close to a flat square bottom surface. When this preforming is completed, the folding tool 40 is lowered by the lowering operation of the elevating frame 41 and is rotated downward by the reverse operation of the cylinder mechanism 45 to discharge the bag packaging body from the vertical bag making filling and packaging machine 20. Allow.

  The square bottom gusset package 1 manufactured by the vertical bag making and packaging machine 20 and discharged downward is accommodated in a forming mold 30. At this time, the square bottom surface of the square bottom gusset packaging body 1 and the side surface connected to the square bottom surface are substantially regulated by the respective regulation surfaces 35, 36 a, 36 b, 38 a, and 38 b provided on the molding die 30. According to the conveyance of the conveyor 31, the forming mold 30 moves through the preheating step (b), the folding step (c), and the cooling step (d) sequentially. In the preheating step (b), the preheating member 10 obtains the backing action of the receiving member 15 with respect to the square bottom gusset packaging body 1 accommodated in the forming mold 30, and the upper end seal portion 4 of the bag and its Preheat neighborhood 6. In the folding step (c), the pressing member 17 operates to tilt the preheated upper end seal portion 4 toward the vicinity 6 side when the pressing member 17 advances from the pressing backward position P3. The pressing member 17 advances to the pressing advance / retreat position P4 by a further pressing operation, and the pressing surface 17 serving as a regulating surface for the upper surface of the corner pushes the upper end seal portion 4 while the square bottom gusset packaging body 1 is molded into the forming mold 30. Press inside. The pressure in the bag increased by this pressing is transmitted to all the bag inner portions, and the square bottom surface and the side surface of the square bottom gusset packaging body 1 correspond to the corresponding regulation surface 35 of the molding frame 30 through the pressure inside the bag. It is pressed against 36a, 36b, 38a, 38b. Therefore, the square bottom gusset packaging body 1 is formed into a rectangular parallelepiped bag packaging body 1 a that is flat on all six sides by the pressing member 17 and the molding die 30. At this time, since the preheated upper end seal portion 4 is pressed against the vicinity 6 which is also preheated by the holding member 17, if the high temperature packaging material can be welded, the square bottom gusset packaging body can be formed. Therefore, the upper end seal portion 4 can be temporarily fixed to the vicinity 6 thereof with a simple structure by using the pressing operation. By temporarily sealing the upper end seal portion 4, the upper end seal portion 4 can be prevented from returning and the rectangular shape of the rectangular bottom gusset package 1 can be maintained in a compact shape. In the cooling step (d), the cooling plate 19 is pressed against the square upper surface of the rectangular parallelepiped bag package 1a, and the heat of the preheated upper end seal portion 4 and its vicinity 6 is quickly taken away and cooled. The The rectangular parallelepiped bag package 1a that has undergone the cooling step (d) is carried out of the conveyor 31 and subjected to subsequent steps such as being accommodated in a cardboard box for distribution.

  In the above-described embodiment, the gas (inert gas such as air or nitrogen gas) remaining around the product is used as the pressure inside the bag. However, the bag package can be deformed by applying internal pressure. As long as the shape of the packaging material is high, it is clear that the present invention can be applied to a bag package in which a liquid or a fluid fluid with high fluidity is packaged.

FIG. 1 is a process diagram for explaining the outline of a bag packaging body forming method and apparatus according to the present invention. FIG. 2 is a perspective view showing an outline of the bag packaging body forming method and apparatus according to the present invention. FIG. 3 is a side view showing a conveyor constituting the bag packaging body forming apparatus according to the present invention and a forming frame attached thereto. FIG. 4 is a side view showing an outline of a bending tool for preforming a square bottom surface of a square bottom gusset package.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Square bottom gusset bag packaging body 1a Cuboid bag packaging body 2 Bag 3 Lower end seal part 4 Upper end seal part 5 Near lower end seal part 6 Near upper end seal part 7a-7d Hem seal 10 Preheating member 11 1st preheating Surface 12 Second preheating surface 15 Receiving member 16 Abutting surface 17 Holding member 18 Holding surface 19 Cooling plate 20 Vertical bag making and filling machine 21 Bag making tube 22 Filling tube 23 Center sealer 24 End sealer cutter 25a-25d Hem sealer 26a, 26b Paper feed belt 30 Forming frame 31 Conveyors 32a, 32b, 32c Sprockets 33a, 33b Chain 34a, 34b Frame member 35 Bottom regulating surface 36a, 36b Front / rear side regulating surface 37a, 37b Guide body 38a, 38b Left / right side regulating surface 40 Bending Tool 41 Elevating frame 42 One end 43 Flat surface 44 Bracket 45 Cylinder mechanism 46 Cylinder 47 Piston 48 Slider 49 Vertical guide P1 Preheating retracted position P2 Preheating advance position P3 Pressing retract position P4 Pressing advance position Fw Web packaging film Ft Cylindrical packaging film

Claims (8)

  A square bottom gusset packaging body in which products are wrapped in a bag in which the upper and lower portions are end-sealed in a gusset folded state, and has a regulation surface for the corner bottom surface of the square bottom gusset packaging body and the side surface connected to the corner bottom. The upper end seal part of the bag and its vicinity are preheated by a preheating member, the preheated upper end seal part is brought down to the preheated vicinity side, and the pressing surface of the pressing member As a regulating surface for the upper surface of the square bottom gusset packaging body, the square bottom gusset packaging body is pressed within the mold frame by the pressing member, and the square bottom surface, the side surface, and the square upper surface are pressed into the molding die. By pressing against the corresponding restriction surfaces of the frame and the pressing member, the six surfaces of the square bottom gusset packaging body are formed flat and the preheated upper end seal portion is in the vicinity Bag package molding method consisting in temporarily fixed seal.   The square-bottom gusset packaging body is formed by forming a packaging film into a cylindrical shape by a bag-making cylinder and providing a center seal while guiding the outer side of a filling cylinder arranged inside the bag-making cylinder. Formed into a film, put the product into the cylindrical packaging film through the inside of the filling cylinder, and end-sealed and individually sealed the cylindrical packaging film filled with the product and gusseted from the side The bag packaging body molding method according to claim 1, wherein the square bottom gusset packaging body, which is manufactured by a vertical bag making and filling packaging machine to be cut and individually cut, is accommodated in the molding frame body.   The filling cylinder is a rectangular filling cylinder having a rectangular cross section, and the tubular packaging film is provided with a hem seal along a traveling direction of the tubular packaging film in a portion corresponding to a corner of the rectangular filling cylinder. 3. The method of forming a bag package according to claim 2, wherein the square bottom gusset package is formed into a rectangular parallelepiped package with a hem seal.   A square bottom gusset packaging body in which a product is packaged in a bag having an end seal portion sealed in a gusset folded state at each of the upper and lower portions can be accommodated, and a side surface connected to the corner bottom of the corner bottom gusset packaging body and the corner bottom A pre-heating member that preheats the upper end seal portion of the bag constituting the square-bottom gusset packaging body that is accommodated in the forming mold frame and the vicinity thereof, The square bottom has a pressing surface as a regulating surface for the corner upper surface of the square bottom gusset packaging body, and is pressed by the pressing surface in a state where the preheated upper end seal portion is tilted to the vicinity side. A gusset packaging body is pressed in the mold frame, and the square bottom, the side surface, and the square upper surface of the square bottom gusset packaging body correspond to the molding frame and the pressing member through pressure in the bag. Each of the above rules Pressed against the surface, the bag package molding apparatus consists of the upper end seal portion that is preheated and a pressing member for temporarily fixing the seal to the vicinity.   A bag-making cylinder for forming and guiding the packaging film into the cylindrical packaging film, and a filling cylinder which is disposed inside the bag-making cylinder and through which the cylindrical packaging film passes outside and a product to be packaged is dropped inside , A center sealer for applying a center seal to the cylindrical film, and a vertical bag making and filling machine provided with an end sealer and a cutter for applying an end seal to the cylindrical packaging film filled with the product. The bag packaging body forming apparatus according to claim 4, wherein the apparatus is applied to the discharge side.   The molded frame body regulates the bottom surface regulating surface for regulating the square bottom of the square bottom gusset packaging body and the side surface facing the opposite side of the square bottom gusset packaging body among the regulation surfaces. A front and rear side surface regulating surface and a frame member attached to the conveyor, and a left and right side surface regulating surface for regulating the other side of the square bottom gusset package facing the opposite side are formed. And a guide body disposed on both sides of the conveyor, and the carry-in portion of the conveyor is disposed on the discharge side of the vertical bag making filling and packaging machine and is cut by the end sealer / cutter The bag packaging body forming apparatus according to claim 5, wherein the square bottom gusset packaging body is sequentially fed into the continuous forming frame body.   The bag packaging body according to claim 6, further comprising a folding tool for bending the lower end seal portion of the bag packaging body to the bag side and preforming the square bottom surface below the end sealer / cutter. Molding equipment. The filling cylinder is a rectangular filling cylinder having a rectangular cross section, and a hem sealer for providing a hem seal along the corner is disposed on the cylindrical packaging film corresponding to the corner of the square filling cylinder. The bag packaging body forming apparatus according to claim 6.

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