JP2006075987A - Folding habit applying method in square bottom bag molding method, folding habit applying device in square bottom bag molding machine, square bottom bag and bag package using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding habit applying method in a method for molding a square bottom bag excellent in shape retention and self-supporting properties at the time of display by thermally modifying a strip-like region including the folding habit of a square bottom part, the folding habit applying device in a square bottom bag molding apparatus, the square bottom bag having a folding habit, and a bag package using it. <P>SOLUTION: The folding habit, which extends in a transverse direction capable of keeping a state folded on both sides of a fold, is applied to a packaging material 62 at the scheduled linear part becoming the boundary of the square cylindrical body part and square bottom part of a bag by the molds 42 and 43 equipped with a folding habit forming blade 44 and a folding habit forming groove 45 of molding tools 40 and 41. As a result, when the packaging material is molded to form the square bottom bag or the bag package using the square bottom bag, a clear folding habit is applied to the boundary of the square cylindrical part and the square bottom part in the square bottom bag or the bag package and shape retention and self-supporting properties in a display state for keeping the state folded on both sides of the fold are extremely enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides, for example, a folding method in a square bottom bag forming method for folding a packaging material and a folding in a square bottom bag forming apparatus in order to obtain a self-supporting square bottom packaging bag or a bag package using the same. The present invention relates to a brazing device, a square-bottom bag with creases, and a bag package using the same.

  Conventionally, a square bottom bag or a square bottom bag package in which a gusset is formed on a square bottom portion is employed as one form of a bag or a bag package in which a product is packaged inside a bag. Since the bottom portion of the square-bottom bag package is configured to be relatively flat, it can be efficiently packed in a box to improve the degree of integration in the distribution stage. In addition, the square-bottom bag package is easy to manage products from the manager side because it sits on the shelves and can be lined up even when displayed on store shelves. At the same time, it leads to an improvement in the image of the orderliness and cleanliness of the store for consumers.

Folding claws are attached to the end sealers that are installed in an automatic packaging machine that manufactures self-supporting packaging, and sandwiches and seals the tubular packaging material, and when the end sealer sandwiches the tubular packaging material, It has been proposed that the claws sandwich the position along the end-sealed portion of the cylindrical packaging material and put a crease. The package body is made to stand on its own by making the bottom surface of the package body substantially flat by bending the ear part side where the crease is attached (Patent Document 1).
JP 2001-354212 A (paragraphs [0009] to [0010], [0040] to [0043]; FIGS. 7, 10, and 11)

  In the automatic packaging machine, on the upstream side of the means for forming the cylindrical packaging material, a first film folding device for folding a predetermined position along the traveling direction of the strip film, and a direction orthogonal to the traveling direction of the strip film And a second film folding device for crease. The first film folding device is used to crease creases at the four corners of the package to form the outer shape of the package in a substantially rectangular shape. Further, when forming a gusset, a crease is attached to the position of the gusset, thereby forming a beautiful gusset and making it easy to bend the ear portion. Further, by providing the second film folding device, a crease is attached to the predetermined position of the film on the ear portion side where the crease is attached by the folding claw provided in the end seal device. The film is folded neatly to make the bottom of the package almost flat. The second film folding apparatus includes first and second folding rollers that have a cylindrical rotating body that is opposed to the upper and lower sides of the belt-like film and that is longer than the width of the belt-like film and that rotates synchronously. ing. The first crease roller has a first crease portion having a convex portion for pushing the belt-like film projectingly disposed on the outer peripheral surface of the rotating body, and the second crease roller is disposed to project on the outer peripheral surface of the rotator. It has the 2nd crease part which has a recessed part which corresponds to a convex part.

A predetermined film portion of the belt-shaped film in the middle of being pulled out from the raw fabric roll passes through the second film folding device, so that the first and second folding portions hit each other in time and the belt-shaped film 11 is predetermined from above and below. A crease is attached so that it may be sandwiched by pressure and cross in the lateral direction of the strip film. Specifically, the position where the transverse signature is applied is the side that comes to the lower side (bottom) in the final package. Then, a total of six folds (mountain fold folds, valley fold folds) are attached to predetermined positions along the film traveling direction by passing through the first film folding apparatus. A belt-like film with creases attached at a predetermined position is guided to a bag making machine, and passes through the bag-like film to be made into a tubular film. At this time, four fold folding folds are guided to the four corners of the bag making machine to form a square cylinder. The tubular film is sealed in the lateral direction by the end seal device and cut to form a package as described later (see FIG. 6). Then, the gusset is formed by pushing the valley folding fold portion into the center by the gusset claw of the gusset forming device. Moreover, a crease is attached along one ear | edge part of a package by a crease claw. Of the ears formed by end sealing, a crease formed by the second film folding device is formed on one ear side. The crease and the crease are folded, and the ear portion side is folded to form a self-supporting package having a flat bottom surface.

As another known example, a stamper having vertical and horizontal ruled lines forming a vertical and horizontal valley fold line and a mountain fold line is arranged on a film sheet (web) continuously supplied in the order of the sheet feeding direction. The manufacturing method and apparatus of the provided square tube packaging bag are proposed (patent document 2). However, the detailed structure of this stamper is not shown, and it is considered that the stamper is merely a ruled line.
Japanese Patent No. 2937012 (paragraphs [0027] and [0058]; FIG. 1)

  However, most of the self-supporting bags that have been proposed so far are manufactured by applying a gusset on the bottom side and end sealing. Even if it is formed by attaching a round crease on the bottom side of the bag or further folding the end seal part on the bottom surface of the bag, as shown in FIG. Although the streak 96 by the crease may be attached to the boundary portion between the side surface portions 93 and 94 of the rectangular tube barrel portion 91 and the corner bottom portion 92, the round portion 95 is formed as a whole, and a clear crease is formed. Is not attached. When the ratio of the length of the short side 98 to the length of the long side 97 of the corner bottom 92 is about 0.5 or less, when the product to be packaged is a weighing product such as a snack confectionery, Independence is low and falls almost naturally or with a slight force.

  To make a clear crease at the boundary between the side surface and the bottom surface, the bag packaging is formed by a post-molding device separate from the automatic packaging machine, such as forming hem seals at the four corners, etc. The body had to be reshaped. Such another post-molding device generally causes the total cost of the packaging machine to be reduced, leading to a decrease in the production capacity of the bag packaging body, and thus an increase in the manufacturing cost of the individual bag packaging body. Is also connected.

  Therefore, for example, a flat packaging material such as a web-shaped packaging material fed out from a raw fabric roll, in order to give a clear crease without forming after the cylindrical packaging material or the bag packaging body is manufactured. There is a problem to be solved in that the crease to be attached to can be maintained in a state in which it is bent at both sides of the crease formed at the boundary between the rectangular tube body and the bottom.

  An object of the present invention is to form such a packaging material by attaching a crease capable of maintaining a folded state on both sides of the crease formed at the boundary between the rectangular tube barrel portion and the corner bottom portion to form the packaging material. When it is used as a packaging bag or a bag package using the same, it has a shape retention and display state in which a clear crease is attached to the boundary between the square tube barrel and the bottom and the folded state is maintained on both sides. Can be obtained, a folding method in a square bottom bag forming method, a folding device in a square bottom bag forming device, a square bottom bag with a crease And a bag package using the same.

  In order to solve the above problems, the folding method in the method for forming a square bottom bag according to the present invention is a method for forming a square bottom bag having at least a square bottom portion and a square cylinder body portion from a flat packaging material. A band-like shape of the flat packaging material that includes the linear portion and extends on both sides of the linear portion of the flat packaging material where a boundary line between a bottom portion and the rectangular tube body is planned. It consists of heating and heat-transforming the region.

  According to the folding method in this square bottom bag forming method, when forming a square bottom bag having at least a square bottom portion and a square tube barrel from a flat packaging material, the square bottom portion and the square tube barrel of the square bottom bag are formed. At this time, the strip-shaped region of the flat packaging material that includes the linear portion and extends on both sides is heated. Thermally transformed. Because it is a transformation in the belt-like region, there is no return of the folded crease after molding, a crease having a clear angle is formed in the folded crease when formed into a square bottom bag, and the square barrel body and the square bottom are Sharp corners are formed and maintained between them.

  In the folding method in this square bottom bag forming method, the heating of the band-like region can be performed while pressurizing with the V-shaped forming die in such a manner that the linear portion is located at the V-shaped apex. . By pressing the flat packaging material with a V-shaped mold, the crease is attached to the linear portion located at the top of the V-shape. At the same time, the belt-like regions of the flat packaging material extending on both sides of the linear portion are sandwiched and pressed by the slope regions located on both sides of the apex of the V-shaped mold. By incorporating a heat source in the mold, the belt-like region of the flat packaging material including the linear portion and extending on both sides thereof is heated and thermally transformed.

  In the folding method in this square bottom bag forming method, the flat packaging material is a web-shaped packaging material, and the band-like region is repeatedly set in a direction crossing the web-shaped packaging material at a pitch by the square bottom bag unit. By doing so, the said square bottom bag can be continuously shape | molded. That is, by repeatedly setting the belt-like region on the web-like packaging material as described above, the traveling web-like packaging material has a corner bottom portion and a bag top portion in the running direction in the same manner as in normal bag-filling packaging. Square bottom bags lined up in order can be continuously formed.

  The folding device in the square bottom bag forming apparatus according to the present invention is the square bottom bag forming apparatus for forming a square bottom bag having at least a square bottom portion and a square cylinder body from a flat packaging material. A molding tool for folding the linear portion of the flat packaging material where a boundary line between the square bottom portion and the rectangular tube body portion is planned, and the molding tool includes the linear portion, It consists of having a belt-shaped thermoforming mold that heats and pressurizes the belt-shaped region of the flat packaging material extending on both sides.

  According to the folding device in this square bottom bag forming apparatus, the molding tool is a flat shape in which a boundary line between the square bottom portion and the square cylinder body portion, which will become a square bottom bag in the future, is planned from the flat packaging material. A crease is attached to the linear part of the packaging material. The belt-shaped thermoforming mold of the molding tool is formed by pressurizing and heating a belt-shaped region of a flat packaging material including a linear portion and extending on both sides thereof, so that the belt-shaped region is thermally transformed. Since it is not a linear transformation of the crease but a transformation in a band-like region straddling the crease, there is no return of the crease after forming the square bottom bag from the flat packaging material, and the crease has a clear angle. A square fold bag is formed in which a folded fold is formed and a sharp corner is formed and maintained between the square tube barrel and the square bottom.

  In the folding apparatus in this square bottom bag forming apparatus, the belt-shaped thermoforming mold is formed into a forming mold set including a V-shaped forming convex mold and a corresponding V-shaped forming concave mold, The linear portion is positioned at the apex of the V-shape, and the belt-like region of the flat packaging material can be heated by heating in a pressurized state by the mold set. A crease is attached to the linear portion located at the apex of the V shape by pressing the flat packaging material with a forming die set of a V-shaped forming convex shape and a forming concave shape. At the same time, the belt-like regions of the flat packaging material extending on both sides of the linear portion are sandwiched and pressed by the slope regions located on both sides of the apex of the V-shaped mold. By incorporating a heat source in the mold, the belt-like region of the flat packaging material including the linear portion and extending on both sides thereof is heated and thermally transformed.

  In the folding device of the square bottom bag forming apparatus, the flat packaging material is a web-shaped packaging material, and the belt-like region is set by repeating the web-shaped packaging material in the transverse direction at a pitch by the square bottom bag unit. Thus, the present invention can be applied to a vertical bag making machine or a vertical bag making filling and packaging machine in which the square bottom bags are continuously formed. That is, by repeatedly setting the belt-like region on the web-shaped packaging material as described above, the traveling from the traveling web-shaped packaging material is the same as that of a normal vertical bag-making machine or vertical bag-making filling and packaging machine. A square bottom bag in which a square bottom portion and a bag top portion are arranged in order in the direction can be continuously formed.

  In addition, a square bottom bag according to the present invention includes a square tube body portion and a square bottom portion formed at a bottom side end portion of the square tube body portion, and is positioned at a boundary between the square tube body portion and the square bottom portion. A crease is attached to the linear portion of the packaging material, and the belt-like region material of the packaging material including the linear portion and extending on both sides thereof is heated and thermally transformed, and the square bottom portion is formed on the crease. It consists of being formed in the bottom part of the gusset angle where the gusset was folded from the side part which opposes along.

  According to this square bottom bag, a crease is attached to the linear portion of the packaging material located at the boundary between the rectangular tube barrel and the square bottom portion, and the belt-like shape of the flat packaging material that includes this linear portion and extends on both sides thereof Since the region is formed by being heated and pressurized, the belt-like region is thermally transformed. Because of the transformation in the belt-like region, the crease will not return after molding from the flat packaging material, and a crease with a clear angle will be formed in the crease, between the square tube body and the corner bottom. This results in a square bottom bag in which sharp corners are formed and maintained.

  In this square bottom bag, the crease is also formed at the bag head, and the bag head can be formed at the gusset corner head that has been gusseted according to the fold. By folding the bag head and the gusset according to the crease, the bag bottom and the bag head are both gusset-folded to form a cuboid packaging bag as a whole.

  Furthermore, the square-bottom bag package according to the present invention is configured such that a product is accommodated in the above-mentioned square-bottom bag. Even if the product is a lightweight product with good snacks, the square-bottom bag package containing such a product does not easily fall over, and can maintain an orderly standing state on the shelf.

  The folding method in the square bottom bag forming method according to the present invention, the folding device in the square bottom bag forming apparatus, the square bottom bag with the folds, and the bag package using the same are configured as described above. Therefore, creases that can be kept bent at both sides of the crease formed at the boundary between the rectangular tube barrel and the corner bottom are attached to the packaging material. When a bag or a bag package using the bag is formed, the square bag or the bag package has a clear crease at the boundary between the square tube body and the square bottom and is maintained in a folded state on both sides. The holding ability and the self-supporting property in the display state can be extremely high.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of folding and folding in forming a square bottom bag according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic view of a vertical bag making filling and packaging device as a square bottom bag forming device to which a folding device according to the present invention is applied, and FIG. 2 is a modification of the vertical bag making filling and packaging device shown in FIG. It is the schematic which shows the principal part.

  According to the vertical bag making filling and packaging apparatus shown in FIG. 1, the web-like packaging material (flat packaging material) 62 wound up as a film-like packaging material roll (raw fabric roll) 63 is composed of a plurality of guide rollers. After being guided by 65, it is fed out while being sandwiched between a feed roller 64 comprising a pinch roller and a guide roller 65. The web-shaped packaging material 62 that has been fed is loosened by the weight of the weight roller 67 whose both end support shafts are vertically guided in the vertical grooves 66 formed in the frames on both sides, and has an appropriate tension. Given. The web-shaped packaging material 62 passes through an adjustment roller 68 and a final guide roller 69, reaches the main body of the vertical bag making and packaging device 60, and is molded into a cylindrical packaging material 71, and then a product A such as a light snack confectionery, for example. Is put into the cylindrical packaging material 71 and finally formed into a bag package P.

  The vertical bag making filling and packaging device 60 is located inside the cylindrically formed packaging material, and forms the web-shaped packaging material 62 into a cylindrical shape, and guides the travel of the packaging material from above. A filling cylinder 72 into which a product to be packaged is charged, a vertical sealing means 73 for forming a cylindrical packaging material 71 by performing vertical sealing (center sealing) on the cylindrically bent packaging material, and the cylindrical packaging material 71 And a side seal means 74 for forming a bag 75 and carrying out a side seal (end seal). The packaging date and time is printed on the web-shaped packaging material 62 by the date device 77. The sensor 76 detects the registration mark M on the web-shaped packaging material 62, the rotary encoder (not shown) measures the feed length of the web-shaped packaging material 62, and a control device (not shown) in which such information is input. Z) controls the brake / clutch provided on the output shaft of the motor, which is the drive source of the packaging material feed mechanism 78 (only one shown) provided on the left and right sides of the filling cylinder 72 respectively. The packaging material feed mechanism 78 includes a feed belt 79 that feeds the cylindrical packaging material 71 having a rectangular tube shape on the outer periphery of the filling cylinder 72. Since the lateral seal means 74 described later is a reciprocating means, the packaging material is intermittently fed throughout the apparatus 60 after the weight roller 67.

  The upper part of the filling cylinder 72 is a cylindrical cylinder part 72a, but changes to a lower rectangular cylinder cylinder part 72c via a continuous cross-sectional shape transition part 72b on the way. The web-shaped packaging material 62 is bent in a cylindrical shape with a circular cross section at the cylindrical cylindrical portion 72a, but continuously changes to a rectangular cross section as it passes through the cross-sectional shape transition portion 72b, and a cross-section at the rectangular cylindrical cylindrical portion 72c. It is formed into a rectangular tubular packaging material 71 and travels. The lateral sealing means 74 is sandwiched from both sides facing the cylindrical packaging material 71 (square cylinder body) below the lower end of the filling cylinder 72, and the bag head of the bag package P manufactured in advance. A lateral seal is formed on the square bottom of the bag 75 manufactured subsequently. A cutter is incorporated in the lateral seal means 74, and the cutter cuts the cylindrical packaging material 71 between the lateral seal portion at the bag head and the lateral seal portion at the corner bottom.

  In relation to the lateral sealing means 74, a gusset folding means 80 is provided. In this example, the gusset folding means 80 is composed of a pair of horizontal triangular plates that fold the gusset against the corner bottom of the subsequent bag above the lateral sealing means 74. The cylindrical packaging material 71 is a rectangle whose cross section is composed of a pair of long sides and a pair of short sides, but the gusset folding means 80 is from the short side, that is, a direction orthogonal to the operating direction of the lateral seal means 74. It is arranged to act by pushing it in from. The gusset folding means 80 is operated at a timing preceding the operation of the lateral sealing means 74, and the lateral sealing means 74 is activated immediately after the gusset folding is completed. 71 is cut. In order to bend the transverse seal part after cutting into the square bottom part, it is possible to arrange a transverse seal part bending means made of a plate material that goes in and out from the side at the square bottom part, but this means is well known. Details are omitted.

  In the modification of the vertical bag making filling and packaging apparatus shown in FIG. 2, a gusset folding means 81 for the bag head is additionally provided. The gusset folding means 81 is composed of a pair of horizontal triangular plates, like the gusset folding means 80. The gusset folding means 81 is composed of a pair of vertical triangular plates that are formed in advance under the lateral seal means 74 and fold the gusset against the bag head of the bag P1 filled with the product A. According to this configuration, when the lateral seal is formed on the head of the product-filled bag manufactured in advance, the bag head can also fold the gusset. At this time, if an internal pressure is further applied to the bag P1, the gusset can be folded and formed into a square head like the square bottom.

As shown in FIG. 1, the folding device 10 is arranged on a traveling path where the web-shaped packaging material 62 fed out from the packaging material roll 63 reaches the vertical bag making filling packaging device 60. Specifically, after the web-shaped packaging material 62 passes from the packaging material roll 63 through the weight roller 67 and is guided by the adjusting roller 68 to extend horizontally, the web-shaped packaging material 62 is bent into the cylindrical packaging material 71. On the way to the former 70 provided in the vertical bag making filling and packaging device 60, the folding / fitting device 10 is provided. A date printing device 77 is provided on the upstream side of the folding device 10, and a registration mark M detection sensor 76 is provided on the downstream side.

The folding device 10 is disposed immediately after the first folding device 11 for attaching the first folding device 21 that extends in the longitudinal direction, that is, the longitudinal direction along the running direction of the web-shaped packaging material 62, and the downstream direction. And a second folding device 12 for attaching a second folding device 22 extending in the transverse direction perpendicular to the running direction of the web-shaped packaging material 62. The first fold 21 is composed of a mountain fold fold 21a and a valley fold fold 21b. The folding according to the present invention is directed to the second folding bar 22 provided by the second folding apparatus 12.

  FIG. 3 is a diagram showing a first folding device among the folding devices shown in FIG. 1, and FIG. 4 is a diagram showing a second folding device among the folding devices shown in FIG.

  As shown in FIG. 3 (a), the first folding apparatus 11 is a rotary folding apparatus having a roller having a rotation axis in a direction parallel to the transverse direction of the web-shaped packaging material 62. The first creasing device 11 includes an upper roller 23 on which convex crease forming blades 25 and concave crease forming blades 26 are formed, and peripheral surfaces corresponding to the crease forming blades 25 and 26, respectively. And a lower roller 24 on which a concave crease forming blade 27 and a convex crease forming blade 28 are formed. The upper roller 23 and the lower roller 24 are respectively provided above and below the web-shaped packaging material 62 so as to correspond to each other at predetermined positions. Four sets of convex crease forming blades 25 and concave crease forming blades 27 are arranged, and when a bag is formed, first folds 21a in a mountain fold shape extending in the vertical direction at the four corners ( 1 and 2). A concave crease forming blade 26 and a convex crease forming blade 28 are arranged between the convex crease forming blades 25, 25 and the concave crease forming blades 27, 27, and formation thereof. By the blades 26 and 28, a valley fold fold 21b (see FIGS. 1 and 2) is formed at an intermediate position between the mountain fold folds 21a and 21a.

  By means of the first folding device 11, two sets of two mountain fold folds 21a along the running direction of the web-shaped packaging material 62 and valley folds at positions between the two mountain fold folds 21a in each set. Conveniently six vertical folding folds 21 consisting of the shape folding folds 21b are continuously attached. The mountain fold crease 21a is a crease extending in the vertical direction at the four corners of the body of the bag wrapping body to be finally produced. At the center position on the side, a fold-shaped crease according to the gusset fold is formed.

  As shown in FIG. 3B, the tip angle of the convex crease forming blades 25, 28 is smaller than the bottom opening angle of the concave crease forming blades 26, 27. The web-shaped packaging material 62 includes the narrowest portions of the crease forming blades 25, 28, that is, the tip portion 29 of the convex crease forming blades 25, 28 and the bottom 30 of the concave crease forming blades 26, 27. The creases 21a and 21b are formed by being pushed linearly at the portion sandwiched between the two. Since the upper and lower rollers 23 and 24 for attaching the folding folds 21a and 21b incorporate heating means (not shown), they are molded while heating the packaging material. The slopes 31 and 31 on both sides of the tip 29 of the convex ridge forming blades 25 and 28 and the slopes 32 and 32 on both sides of the bottom 30 of the concave fold forming blades 26 and 27 are gradually from the tip 29 (bottom 30). Since it spreads, the web-shaped packaging material 62 is hardly pressed / heated except for the linear portion of the crease 21.

  As shown in FIG. 4 (a), the second folding device 12 for attaching the second folding bag 22 extending in the lateral direction is a web-like packaging at two predetermined positions for each packaging bag unit length. These are two sets of reciprocating folding devices equipped with molding tools 40 and 41 that extend in the lateral direction perpendicular to the traveling direction of the material 62 and sandwich the web-shaped packaging material from above and below. Each set of forming tools 40 and 41 is provided corresponding to predetermined positions of the corner head and the corner bottom of the bag in the vertical direction. The forming tools 40 and 41 have a length exceeding the width of the web-shaped packaging material 62, and operate to sandwich and separate the web-shaped packaging material 62 at the same time by an appropriate drive mechanism. The drive mechanism may be a mechanical drive mechanism that converts rotation into reciprocating motions in opposite phases, and may be operated in opposite directions by an air cylinder.

  In this example, the forming tool 40, 41 of each set is attached between the corner bottom 2 and the corner head 9 of the square bottom bag (see P in FIG. 5) and the square tube barrel 1 in this example. It is a linear part of the web-shaped packaging material 62 where a boundary line is planned. The forming tools 40 and 41 are each formed by heating and pressurizing the band-like region 52 (see the hatched region in FIG. 4B) of the web-like packaging material 62 that includes the linear portion and extends on both sides thereof. It has a stamp bar type belt-shaped thermoforming mold. The belt-shaped thermoforming die comprises a forming convex die 42 having a V-shaped crease forming blade 44 on the lower surface and a forming concave die 43 having a corresponding V-shaped crease forming groove 45 on the upper surface. It is configured in a mold set. Heating means 46 such as a heater is incorporated in the molds 42 and 44, and the belt-shaped region 52 is heated at the same time as being pressurized.

  As shown in FIG. 4B, the slopes 50 on both sides of the apex 48 of the V-shaped crease forming blade 44 in the molding convex mold 42 and the bottom 49 of the V-shaped crease forming groove 45 in the molding concave mold 43. The slopes 51 on both sides are substantially parallel. By driving the molding dies 42 and 43 in a state where the linear portion of the web-shaped packaging material 62 is aligned with the apex 48 of the crease forming blade 44, the belt-shaped region 52 of the web-shaped packaging material 62 is changed to the V-shape of the molding die. By heating the inclined surfaces 50 and 51 of the crease forming blade 44 and the crease forming groove 45 in a pressurized state, a V-shaped apex 48 and a linear portion located at the bottom 49 corresponding thereto are formed. A two-fold fold 22 is attached. At the same time, the belt-like region 52 of the flat packaging material extending on both sides of the linear portion is sandwiched and pressurized by the regions of the inclined surfaces 50 and 51, and is thermally transformed.

  Each set of forming tools 40 and 41 is disposed at a position corresponding to a position where a square gusset is folded into the bag in the packaging material for one bag indicated by pitch p in FIG. Therefore, the upper and lower molds 42 and 43 allow the packaging material for one bag to be folded into the gusset folding position of the packaging bag so that the second folding rods 22 and 22 having a mountain fold shape that circulates in the circumferential direction of the rectangular tube body portion (see FIG. 1, see FIG. 2).

  By repeatedly setting the belt-like region 52 in the direction crossing the web-shaped packaging material 62 at a pitch p in units of square bottom bags, the square bottom bag packaging body P can finally be continuously formed. That is, by repeatedly setting the belt-like region 52 on the web-shaped packaging material 62 as described above, the corner bottom portion and the bag in the traveling direction are moved from the traveling web-shaped packaging material 62 in the same manner as in normal bag making and packaging. The square bottom bag packaging body P in which the top part is arranged in order can be continuously formed.

  FIG. 5 shows an example of a bag package in which lightweight confectionery such as snack confectionery is packaged as a product in a packaging bag. The bag packaging body P is a gusset packaging body in which a gusset fold is applied to the square bottom portion 2 to form a gusset square bottom portion. 5 (a) is a perspective view showing an example of a bag package P in which the bag head 9 is not gusset folded, but FIG. 5 (b) is a bag package in which the bag head 9 is gusset folded. It is a perspective view which shows an example of body P '. The gusset folding at least on the bottom side is performed by the gusset folding means 80 on the basis of the second folding bar 22 that is a mountain fold. The corner bottom portion 27 is a rectangular gusset corner bottom portion surrounded by the long side 7 and the short side 8.

  Since the molding dies 42 and 43 are provided with heating means 46 therein, they operate when the web-like packaging material 62 is intermittently stopped, and heat is applied when strongly sandwiched to transform the packaging material. The conditions (temperature / time) for applying creases vary depending on the type and thickness of the material and (multilayer / metal film layer). Since the belt-like region 52 including the second crease 22 of the packaging material is transformed by heat, the crease 5 formed from the crease 22 is not returned after the manufacture of the bag wrapping P, and the square bottom bag wrapping is performed. When formed into a body P, a crease 5 having a clear angle is formed at least around the corner bottom 2, and a sharp right angle is formed between the square barrel body 1 and the corner bottom 2 and around the corner bottom 2. Parts are formed and maintained. Therefore, the shape retention of the bag package P is enhanced, and even when a lightweight product is packaged, the independence is ensured, and with a little force, the shape does not collapse or fall down. It is possible to manufacture a bag or a bag package having excellent display properties.

It is the schematic of the vertical type bag making filling packaging apparatus as a square bottom bag shaping | molding apparatus with which the folding / fitting apparatus was applied. It is the schematic which shows the principal part of the modification of the vertical type bag making filling packaging apparatus shown in FIG. It is a figure which shows the 1st folding apparatus among the folding apparatuses shown in FIG. It is a figure which shows the 2nd folding apparatus among the folding apparatuses shown in FIG. It is a figure which shows an example of the bag packaging body which packaged lightweight confectionery like a snack confectionery in a packaging bag as a product. It is a perspective view which shows an example of the package body of the conventional square bottom bag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Square cylinder body part 2 Square bottom part 9 Square head part 10 Folding apparatus 11 1st folding apparatus 12 2nd folding apparatus 21 1st folding machine 21a Mountain folding machine 21b Valley folding machine 22 First 2 crease 23 upper roller 24 lower roller 25, 28 crease forming blade (convex)
26, 27 Folding edge forming blade (concave)
DESCRIPTION OF SYMBOLS 29 Tip part 30 Bottom part 31,32 Slope 40,41 Molding tool 42 Molding convex mold 43 Molding concave mold 44 Folding crease formation blade 45 Folding crease formation groove 46 Heating means 48 Vertex 49 Bottom part 50 Slope 51 52 Band-shaped area 60 Packaging device 62 Web-shaped packaging material 63 Packaging material roll 64 Feed roller 65 Guide roller 66 Groove 67 Weight roller 68 Adjusting roller 69 Final guide roller 70 Former 71 Cylindrical packaging material 72 Filling cylinder 72a Cylindrical cylinder part 72b Cross-sectional shape transition part 72c Square Cylindrical portion 73 Vertical seal means 74 Horizontal seal means 75 Bag 76 Sensor 77 Date device 78 Packaging material feed mechanism 79 Feed belt 80, 81 Gusset folding means A Product P, P1 Bag package M Registration mark

Claims (9)

  In the method of forming a square bottom bag having at least a square bottom and a square tube barrel from a flat package, a boundary line between the square bottom and the square tube barrel is planned. A folding method in a square-bottom bag forming method, wherein a belt-like region of the flat packaging material including the linear part and extending on both sides thereof is heated and thermally transformed while attaching the folding part to the linear part.   In the square bottom bag shaping | molding method of Claim 1, Comprising: The heating of the said strip | belt-shaped area | region consists of pressurizing with the said V-shaped shaping | molding die in the aspect in which the said linear part is located in a V-shaped vertex. A method of folding.   The flat packaging material is a web-shaped packaging material, and the belt-like region is repeatedly set in a direction crossing the web-shaped packaging material at a pitch by the square bottom bag unit, and the square bottom bag is continuously formed. The folding method in the square bottom bag shaping | molding method of Claim 1 or 2 which consists of this.   In a square bottom bag forming apparatus for forming a square bottom bag having at least a square bottom portion and a square tube trunk portion from a flat packaging material, a boundary line between the square bottom portion of the square bottom bag and the square tube trunk portion is formed. A molding tool for folding a linear portion of the planned flat packaging material is provided, and the molding tool includes heating and pressurizing the strip-shaped region of the flat packaging material including the linear portion and extending on both sides thereof. A folding device in a square bottom bag forming apparatus comprising a belt-shaped thermoforming mold for forming.   The belt-shaped thermoforming die is formed into a forming die set consisting of a V-shaped forming convex die and a corresponding V-shaped forming concave die, and the crease has the linear portion at the V-shaped apex. 5. The folding device in a square bottom bag forming apparatus according to claim 4, wherein the folding device is attached by heating the belt-like region of the flat packaging material in a pressurized state by the mold set.   The flat wrapping material is a web-shaped wrapping material, and the belt-like region is set by repeating the web-shaped wrapping material in the transverse direction at a pitch by the square bottom bag unit, and the vertical bottom bag is continuously formed. 6. The folding device in a square bottom bag forming apparatus according to claim 4 or 5, which is applied to a mold bag making machine or a vertical bag making filling and packaging machine.   A square cylinder body and a square bottom formed at a bottom side end of the square cylinder body part, and a crease is formed in a linear portion of the packaging material positioned at a boundary between the square cylinder body part and the square bottom part The band-shaped region material of the packaging material including the linear portion and extending on both sides thereof is heated and thermally transformed, and the corner bottom portion is gusseted from the side surface portion facing the fold. A square bottom bag consisting of the gusset formed at the bottom of the square.   8. The square bottom bag according to claim 7, wherein the folded bag is also formed on a bag head, and the bag head is formed on a gusset bag head that is gusseted according to the folded bag. The square bottom bag package which accommodates a product in the inside of the said square bottom bag of Claim 7 or 8.

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