WO2022176645A1 - 縦型製袋充填包装機、内容物入りフィルム包装袋の製造方法、内容物入りフィルム包装袋 - Google Patents
縦型製袋充填包装機、内容物入りフィルム包装袋の製造方法、内容物入りフィルム包装袋 Download PDFInfo
- Publication number
- WO2022176645A1 WO2022176645A1 PCT/JP2022/004372 JP2022004372W WO2022176645A1 WO 2022176645 A1 WO2022176645 A1 WO 2022176645A1 JP 2022004372 W JP2022004372 W JP 2022004372W WO 2022176645 A1 WO2022176645 A1 WO 2022176645A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- seal
- gusset
- content
- packaging bag
- Prior art date
Links
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Images
Classifications
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Definitions
- the present invention relates to a vertical form-fill-seal and packaging machine that manufactures film packaging bags having a top gusset, a bottom gusset, and a spout protruding from the top gusset.
- a vertical form-fill-seal machine forms a bag from a belt-shaped plastic film, fills the bag with contents, and continuously manufactures film packaging bags containing the contents.
- Vertical form-fill-seal machines are often used for automatic packaging of foods. It is also used for automatic packaging of detergents for baths, toilets and laundry.
- Self-supporting bags with gussets at the bottom are manufactured as film packaging bags filled with beverages, detergents, and the like.
- a packaging bag is called a standing pouch or the like, and can be expected to have a high display effect to promote sales by allowing it to stand on its own on a display shelf.
- Self-supporting bags such as standing pouches have an elliptical bottom and a flat top, so if they are packed in a cardboard box for transportation in an upright position, the loading efficiency (space volume ratio) deteriorates. Therefore, a double-gusset bag has been developed in which a gusset is also formed on the top.
- An object of the present invention is to provide a vertical form-fill-seal machine that can efficiently manufacture double-gusset bags.
- the vertical form-fill-seal machine includes a top folding section that folds the sides of a belt-shaped film into a Z-shape to form a first fold, and folds the center of the film into an M-shape to form a first fold.
- a bottom fold that forms a second fold, and a side edge of the first fold and the film are heat-sealed to form the film into a tubular shape, and a top gusset and a spout protruding from the top gusset. and a bottom seal portion forming a bottom gusset by heat-sealing the second fold.
- the top folded portion is characterized by comprising an auxiliary top seal portion that forms a part of the top gusset by heat-sealing the mountain folds of the first fold.
- a conveying section that conveys the film downward; a filling section that continuously loads the contents into the film; a straightening section, a squeezing roller section arranged above the straightening section for pressing and handling the film from the front and back, and a straightening roller section arranged below the straightening section for laterally heat-sealing the film. It is characterized by comprising a side seal portion that forms a bag and a cutter portion that separates the bag from the film.
- the correcting section is characterized by comprising a first pair of correcting plates in close contact with a portion extending from the bottom gusset to the top gusset.
- the first correction plate pair is characterized in that each has a semi-cylindrical shape.
- the correcting portion is characterized by comprising a second pair of correcting plates that are in close contact with a portion from the top gusset to the spout portion.
- the second correction plate pair includes an extension piece extending in the horizontal direction from one of the first correction plate pair, and a pressing piece that protrudes from the other of the first correction plate pair and faces the extension piece. It is characterized by
- the pouring part is characterized in that it has a cut piece that is cut off when unsealing.
- the spouting part has a plastic spout heat-sealed between the side edges of the film.
- a method for manufacturing a content-filled film packaging bag comprises a top folding step of folding the sides of a belt-shaped film into a Z shape to form a first fold, and folding the center of the film into an M shape.
- the top folding step is characterized by including an auxiliary top sealing step of forming the mountain fold of the first fold into an arbitrary seal shape.
- a content-filled film packaging bag is a content-filled film packaging bag in which a fluid is filled and sealed in the film packaging bag, and a top gusset in which the film on the top surface of the film packaging bag overlaps in an M shape. , a bottom gusset where the film on the bottom surface of the film packaging bag overlaps in an M shape;
- the fold width of the first pleat on which the projecting portion is arranged is larger than that of the other second pleat.
- the first pleat and the second pleat each have a seal that is heat-sealed along the top of the pleat in the longitudinal direction.
- the first pleat has a seal heat-sealed at its crest along the longitudinal direction, and the second pleat does not have a seal heat-sealed at its crest.
- the seal is characterized in that the center in the longitudinal direction has an arc-shaped recess toward the top.
- the two pleats are characterized in that both ends in the longitudinal direction are fixed to each other by heat welding.
- the pouring part has a cut piece formed by heat-welding the side edges of the film, and cuts off the cut piece to form an opening for taking out the fluid.
- the pouring part is a plug made of plastic, and the plug is arranged and fixed between the side edges of the film.
- the present invention can efficiently manufacture double gusset bags. In particular, it is possible to stabilize the filling amount of a double-gusset bag having a spout protruding from the top gusset.
- FIG. 1 is a front view showing a schematic configuration of a vertical form-fill-seal machine 1 according to an embodiment
- FIG. 4 is a schematic diagram showing, in order of steps, a top folding step S2 and a bottom folding step S3 of the method for manufacturing the content-filled film packaging bag G according to the embodiment.
- FIG. 10 is a perspective view showing a correcting step S8 of the method for manufacturing the content-filled film packaging bag G according to the embodiment in order of steps.
- FIG. 10 is a perspective view showing a first modified example of a content-filled film packaging bag;
- FIG. 11 is a perspective view showing a second modification of the content-filled film packaging bag.
- FIG. 11 is an enlarged front view showing a modification of the vertical form-fill-seal machine.
- the vertical form-fill-seal packaging machine 1 and the method of manufacturing the content-filled film packaging bag G according to the embodiment of the present invention will be described below.
- FIG. 1 is a diagram showing a film packaging bag G containing a content, and (a) is a perspective view seen from the front upper direction.
- the content-filled film packaging bag G is a bag formed from a sheet of plastic film F and filled with content X. As shown in FIG.
- the film packaging bag G is a so-called double gusset bag, and has a top gusset G3 on the top surface (upper part) and a bottom gusset G4 on the bottom surface (lower part).
- the height direction when the content-filled film packaging bag G is in an upright position is also referred to as the vertical direction.
- the width direction of the content-filled film packaging bag G is also referred to as the left-right direction.
- the thickness direction (inflating direction) of the content-filled film packaging bag G is also referred to as the front-rear direction.
- the surface (rear surface G2) of the film packaging bag G having the cut piece T2a is referred to as the rear side.
- the top gusset G3 has a first pleat G31 and a second pleat G32.
- the first pleat G31 and the second pleat G32 have different shapes.
- the first pleat G31 and the second pleat G32 have the same length in the horizontal direction, but different widths in the vertical direction (folding width and depth).
- the second pleat G32 protrudes upward from the first pleat G31.
- a plug G8 is arranged at the top (mountain fold) of the second pleat G32.
- the bottom gusset G4 has a first pleat G41 and a second pleat G42.
- the first pleat G41 and the second pleat G42 have the same shape (rectangle).
- the first pleat G41 and the second pleat G42 have the same length in the left-right direction, and have uniform (same) widths in the up-down direction (folding width and depth) in the left-right direction. Both lateral ends of the top gusset G3 and the bottom gusset G4 are welded. That is, the left-right ends of the first pleat G31 and the second pleat G32 and the left-right ends of the first pleat G41 and the second pleat G42 are connected. Therefore, the film packaging bag G has a substantially elliptical cylindrical shape. In other words, the film packaging bag G has a convex-lens-shaped or almond-shaped cross section in the horizontal direction.
- the top gusset G3 has a top seal T formed along the outer periphery of the top surface.
- the top seal T consists of three seals (seal T1, seal T2, seal T3).
- the seal T1 is formed by heat-sealing the upper end (mountain fold F3) of the front surface G1 (first pleat G31) of the film packaging bag G.
- the seal T2 is formed by heat-sealing the upper ends (the side edges E1 and E2) of the rear surface G2 (the second pleat G32) of the film packaging bag G.
- the seal T2 has a cut piece T2a that is cut when the film packaging bag G is opened.
- the seal T2 has a pair of inclined portions T2b that are connected to the left and right ends of the cut piece T2a.
- a notch T2c is formed at the boundary between the cut piece T2a and the inclined portion T2b.
- the notch T2c serves as a starting point for tearing the film F to form an opening (not shown).
- the cut piece T2a and the pair of inclined portions T2b surround the narrow accommodation portion G6.
- the narrow accommodation part G6 is an internal space exposed from an opening formed by cutting the cut piece T2a.
- a part where an unsealing opening (opening) is formed is called a pouring part G7. That is, the spout portion G7 is a portion protruding from the top gusset G3.
- the seal T3 is formed by heat-sealing both left and right ends of the upper portion of the film packaging bag G (overlapping portions where the films F are four-folded).
- the seal T3 connects (fixes) the left and right ends of the first pleat G31 and the second pleat G32.
- the bottom gusset G4 has a bottom seal B formed along the outer periphery of the bottom surface.
- the bottom seal B consists of three seals (a pair of seals B1 and B3).
- the pair of seals B1 are formed by heat-sealing the lower ends (mountain folds F7) of the front surface G1 (first pleat G41) and rear surface G2 (second pleat G42) of the film packaging bag G, respectively.
- the pair of seals B1 have the same shape and are formed at the same time.
- the seal B3 is formed by heat-sealing both left and right ends of the lower portion of the film packaging bag G (overlapping portions where the films F are four-folded).
- the seal B3 connects (fixes) the left and right ends of the first pleat G41 and the second pleat G42.
- the sealant layer of the film F When the sealant layer of the film F is arranged only on one side (the inner surface), the outer surfaces of the film F cannot be thermally welded to each other even if the film F is folded four times. Therefore, the first pleat G41 and the second pleat G42 are separated. In order to stabilize the film packaging bag G in an upright posture, it is necessary to connect the left and right ends of the first pleat G41 and the second pleat G42. Therefore, punching holes may be provided in the portions where the outer surfaces of the film F overlap each other. Punching holes are provided on the outer surfaces of the respective parts, and are opposed to each other when folded. As a result, even when the film F is folded four times, the inner surfaces (sealant layers) of the film F are brought into close contact with each other through the punched holes, and can be heat-sealed well.
- the bottom seals B are wider than the top seals T (seals T1, T2), and serve as support (reinforcement) when the content-filled film packaging bag G is erected.
- a part (top surface, bottom surface) of the film packaging bag G surrounded by the top seal T and the bottom seal B functions as a folding gusset of the film packaging bag G.
- the film packaging bag G has a pair of side seals S extending vertically at both ends in the left-right direction.
- the side seal S has an upper end connected to a seal T3 of the top seal T and a lower end connected to a seal B3 of the bottom seal B.
- the accommodating portion G5 is a non-sealed portion (cylindrical film) that is not heat-sealed in the film packaging bag G, and is a space in which the content X is filled and enclosed.
- the accommodation portion G5 communicates with a narrow accommodation portion G6 formed in the second pleat G32 of the top gusset G3.
- the narrow accommodation portion G6 is a portion of the second pleat G32 of the top gusset G3 that protrudes upward from the first pleat G31.
- Film F is a laminate film in which high-strength films such as nylon and polyester are laminated.
- the film F it is preferable to use a packaging film having excellent crossability (straight cutting ability). In other words, it is preferable to use a film that is easy to cut in the horizontal direction and difficult to cut in the vertical direction.
- Content X is a liquid or paste (semi-solid) beverage, food, chemical product, or the like. Specifically, fluids such as drinking water, jelly, household detergents, and shampoos.
- FIG. 2 is a front view showing a schematic configuration of the vertical form-fill-seal machine 1 according to the first embodiment.
- a vertical form-fill-seal-packaging machine 1 forms a double-gusset film packaging bag G from a belt-shaped film F and simultaneously fills the film packaging bag G with a content X.
- the vertical form-fill-seal packaging machine 1 is controlled by a control unit (not shown) to intermittently convey the film F downward while filling the content X. As shown in FIG. The vertical form-fill-seal packaging machine 1 fills the film packaging bag G almost completely with the contents X so as to leave as little air as possible.
- the vertical form-fill-seal machine 1 does not include a measurement unit for measuring the filling amount of the contents X or a shutter valve for adjusting the filling amount.
- the vertical form-fill-sealing machine 1 manufactures a content-filled film packaging bag G without variation in the filling amount of the content X while continuously filling the content X. - ⁇
- the longitudinal direction of the film F is also referred to as the transport direction.
- the width direction of the film F is also referred to as the lateral direction.
- the thickness direction of the film F is also referred to as the overlapping direction.
- the longitudinal direction of the film F in the vertical form-fill-seal packaging machine 1 is also referred to as a vertical direction, an up-down direction, or a longitudinal direction.
- the lateral direction of the film F in the vertical form-fill-seal packaging machine 1 is also referred to as the lateral direction.
- the thickness direction of the film F (film packaging bag G) in the vertical form-fill-seal packaging machine 1 is also referred to as the front-rear direction.
- the vertical form-fill-seal packaging machine 1 includes a film supply section 10, a top folding unit 20, a bottom folding unit 30, a top sealing section 40, a bottom sealing section 50, a design cutter section 60, a film conveying section 70, and a filling section 80. , a squeeze roller portion 90, a correction portion 100, a side seal portion 110, a cutter portion 120, and the like.
- the film supply unit 10 feeds out the film F from a roll (not shown) and passes it through a plurality of driven rollers and the like.
- the film supply unit 10 feeds the film F while applying a constant tension so that the film F does not slack or meander.
- the film supply section 10 supplies the film F toward the top folding unit 20 .
- the top folding unit (top folding section) 20 is arranged diagonally to the upper right of the film supply section 10 .
- the top folding unit 20 folds the strip-shaped film F into a Z shape.
- the film F is folded in a Z shape at one side (side edge E1 side) in the width direction to form a top gusset fold F1.
- the top gusset folding (first folding) F1 consists of a valley fold F2 on the side edge E1 side of the film F and a mountain fold F3 on the center side, and is also called a three-fold.
- One side of the first pleat G31 and the second pleat G32 are simultaneously formed in the top gusset folding F1.
- the top folding unit 20 includes a folding plate portion 22 , a pressing roller portion 24 and an auxiliary top sealing portion 26 .
- the folding plate portion 22 has a plurality of plate members extending along the transport direction of the film F (rightward direction). The film F slides along these plate members.
- the folding plate portion 22 bends one side portion (the side edge E1 side) of the film F downward and further pushes it toward the center to fold it into a Z shape. It is folded so that the width from the valley fold F2 to the side edge E1 is larger than the width from the valley fold F2 to the mountain fold F3.
- the width of the second pleat G32 is larger than that of the first pleat G31 (at different depths).
- the pressing roller section 24 is arranged downstream of the folding plate section 22 and consists of a pair of driven rollers.
- the pressing roller unit 24 presses the Z-folded portion vertically (overlapping direction) with the pair of driven rollers to form a crease (top gusset fold F1) on the film F. As shown in FIG.
- the pressure roller unit 24 changes the conveying direction of the film F downward. That is, the film F is sent downward via the pair of driven rollers.
- the auxiliary top seal portion 26 forms the seal T1 by heat-sealing the mountain fold F3 of the top gusset fold F1.
- the auxiliary top seal portion 26 forms a seal T1 at the top of the first pleat G31 or the like.
- the auxiliary top seal portion 26 has a heater bar pair, which sandwiches the mountain fold F3 and thermally welds the upper ends of the first pleats G31 in the vertical direction.
- Auxiliary top seal portion 26 forms seal T1 in film F to assemble a portion of top gusset G3 (first pleat G31).
- the seal T1 is narrow in the center and wide at both ends in the vertical direction.
- the seal T1 is formed only at the top portion of the first pleat G31 in the center in the vertical direction, and is formed from the top portion to the base portion at both ends in the vertical direction.
- the seal T1 is formed over the entire length of the first pleat G31 in the left-right direction when the film packaging bag G is in an upright position, with the center in the left-right direction pointing upward (top). It has an arcuate concave shape.
- the first pleat G31 is sent downstream while maintaining its shape without slackening or meandering during transportation.
- Bottom folding unit 30 A bottom folding unit (bottom folding section) 30 is arranged directly below the top folding unit 20 .
- the bottom folding unit 30 folds the strip-shaped film F into an M shape (W shape).
- the film F is folded in an M shape at the center in the width direction to form a bottom gusset fold F5.
- the bottom gusset folding (second folding) F5 is composed of a valley fold F6 in the center of the film F and a pair of mountain folds F7 on both sides thereof, and is also called a bellows fold.
- a first pleat G41 and a second pleat G42 are simultaneously formed in the bottom gusset folding F5.
- the bottom folding unit 30 includes a folding plate portion 32 and a pressing roller portion 34 .
- the folding plate portion 32 has a plurality of plate members extending along the direction in which the film F is transported. The film F slides along these plate members. The folding plate portion 32 first presses both sides of the film F to fold it into a U shape. Further, the folding plate portion 32 pushes the center of the film F inward and folds it into an M shape (W shape). As a result, a bottom gusset fold F5 is formed on the left side of the film F. As shown in FIG.
- a first pleat G41 and a second pleat G42 are simultaneously formed in the bottom gusset folding F5.
- the bottom gusset folding F5 is folded so that the widths of the valley fold F6 to the mountain fold F7 are substantially the same.
- the first pleat G41 and the second pleat G42 of the bottom gusset folding F5 are formed to have the same width (uniform depth).
- the pressing roller section 34 consists of two pairs of driven rollers 35 and 36 arranged downstream of the folding tab 32 .
- the driven roller pair 35 arranged on the right side of FIG. 2 sandwiches the side edges E1 and E2 of the film F in the front-rear direction (overlapping direction) and brings them into close contact with each other.
- the driven roller pair 36 arranged on the left side of FIG. 2 crushes the M-shaped folded portion in the front-rear direction (overlapping direction) to fold the film F (bottom gusset folding F5). Then, the pressing roller section 34 feeds the film F downward.
- the top seal portion 40 is arranged below the bottom folding unit 30 .
- the top seal portion 40 thermally welds the side edges E1 and E2 of the film F to form a seal T2.
- Forming the seal T2 on the film F assembles the second pleats G32 and at the same time makes the film F tubular.
- the top seal portion 40 forms a seal T3 by heat-sealing both ends of the first pleat G31 and the second pleat G32 in the vertical direction (overlapping portions where the films F are four-folded) to form the top gusset G3. assemble.
- the top seal portion 40 includes a first top heater bar pair 42 arranged directly below the driven roller pair 35 and a second top heater bar pair 44 arranged directly below the first top heater bar pair 42 .
- the first top heater bar pair 42 sandwiches both ends of the first pleat G31 and the second pleat G32 in the vertical direction (overlapping portions where the films F are four-folded) from the front and back, and thermally welds them to form the seal T3.
- the second top heater bar pair 44 sandwiches the side edges E1 and E2 of the film F from the front and rear, and thermally welds them to form a seal T2.
- the bottom seal portion 50 is arranged on the side (left side) and below the top seal portion 40 .
- the bottom seal portion 50 forms the bottom seal B by heat-sealing the bottom gusset folding F5.
- the bottom seal portion 50 assembles a bottom gusset G4 having a first pleat G41 and a second pleat G42.
- the bottom seal portion 50 includes a first bottom heater bar pair 52 arranged in parallel with the second top heater bar pair 44 and a second bottom heater bar pair 54 arranged immediately below the first bottom heater bar pair 52. .
- the first bottom heater bar pair 52 sandwiches a pair of mountain folds F7 (first pleat G41, second pleat G42) of the bottom gusset folding F5 and thermally welds them to form a pair of seals B1.
- the second bottom heater bar pair 54 sandwiches the vertical ends of the first pleat G41 and the second pleat G42 and thermally welds them to form a seal B3.
- the overlapped portions where the films F are four-folded are heat-sealed, and the bottom gusset G4 is assembled.
- a tubular film F having a bottom gusset G4 is formed.
- Design cutter section 60 The design cutter section 60 is arranged below the second top heater bar pair 44 .
- the design cutter portion 60 is arranged substantially parallel to the second bottom heater bar pair 54 of the bottom seal portion 50 .
- the design cutter section 60 trims the contour of the top seal T (seal T2) formed by the top seal section 40 .
- the design cutter unit 60 cuts the outer edge side of the seal T2 to form a cut piece T2a, a pair of inclined portions T2b and a notch T2c in the seal T2.
- the film transport section 70 is arranged below the design cutter section 60 .
- the film transport section 70 intermittently transports the film F downward.
- the film transport section 70 has two pairs of drive rollers.
- the drive roller pairs are arranged on the right and left sides of the film F, respectively. Each drive roller pair rotates while nipping the film F in the front-rear direction, and feeds the film F downward.
- the filling section 80 continuously feeds the contents X into the inside of the tube-shaped film F (accommodating section G5, narrow accommodating section G6) below the film conveying section 70 .
- the filling section 80 includes a filling pump (not shown) and a filling nozzle 82 .
- the fill pump pumps the content X toward the fill nozzle 82 .
- the filling nozzle 82 is inserted from the side (right side) of the bottom folding unit 30 into the inside of the U-shaped folded film F. As shown in FIG.
- the filling nozzle 82 extends straight downward from the bottom folding unit 30 to reach below the film transport section 70 .
- the filling section 80 drives the filling pump to continuously discharge the contents X from the filling nozzle 82 toward the inside of the tubular film F.
- the squeeze roller unit 90 is arranged below the filling nozzle 82 and handles the tubular film F filled with the contents X.
- the squeezing roller unit 90 includes a pair of squeezing rollers 92 extending in the left-right direction. The pair of squeezing rollers feeds the tubular film F downward while nipping the film F in the front-rear direction. As a result, the content X filled in the tubular film F is vertically divided by the pair of squeeze rollers.
- the tubular film F is flattened and conveyed toward the side seal portion 110 . This makes it possible to reliably form the side seals S on the film F.
- FIGS. 3A and 3B are diagrams showing the correcting section 100, including (a) a side view and (b) a perspective view.
- the correcting section 100 is arranged directly below the squeezing roller section 90 and corrects the filling shape of the tubular film F filled with the contents X.
- the correcting section 100 presses the filling shape of the tubular film F from the front and rear directions before the squeezing roller section 90 operates. To surely spread a content X to a top gusset G3 and a bottom gusset G4 of a tubular film F. Then, the filling amount of the content X enclosed in the tubular film F is made constant.
- the correction section 100 includes a first correction plate pair 102 and a second correction plate pair 106 .
- the first correction plate pair 102 presses a portion (receiving portion G5) of the tubular film F from the bottom gusset G4 to the top gusset G3.
- the first pair of correction plates 102 are plate members 103 and 104 extending in the left-right direction, and are arranged to face each other with the film F sandwiched therebetween in the front-rear direction.
- the plate members 103 and 104 have symmetrical shapes with the film F interposed therebetween. Specifically, the plate members 103 and 104 each have a semi-cylindrical shape, and form a substantially elliptical space therebetween when they are close to each other. That is, when the film F filled with the content X is pressed by the plate members 103 and 104, the filled shape of the film F is corrected to a substantially elliptical shape.
- the second correction plate pair 106 crushes the spout portion G7 protruding from the top gusset G3.
- the spout portion G7 is a portion extending from the top gusset G3 to the cut piece T2a.
- the second correction plate pair 106 crushes the narrow accommodation portion G6 surrounded by the seal T2 (the upper end portions of the cut piece T2a and the pair of inclined portions T2b).
- the second correcting plate pair 106 includes an extending piece 107 and a pressing piece 108 .
- the extension piece 107 is a portion extending rightward from the plate member 103 (one of the first correction plate pair 102), and has the same semi-cylindrical shape as the extension piece 107. As shown in FIG.
- the pressing piece 108 is a member that protrudes rearward from the plate member 104 (the other of the first correction plate pair 102 ) and faces the extending piece 107 , and has a semi-cylindrical shape similar to the extending piece 107 .
- the extending piece 107 and the pressing piece 108 move as the plate members 103 and 104 approach and come into close contact with each other.
- the narrow accommodation portion G6 is crushed and the content X is pushed out toward the accommodation portion G5.
- the air accumulated in the narrow accommodation portion G6 is also pushed out toward the accommodation portion G5.
- the squeeze roller section 90 crushes the film F flat. As a result, the filling amount of the content X enclosed in the film F is made constant.
- the side seal portion 110 is arranged below the correction portion 100 .
- the side seal portion 110 forms the side seal S by heat-sealing the film F flattened by the squeezing roller portion 90 .
- the bottom side is sealed by the side seals S to form a complete bag (film packaging bag G).
- the side seal portion 110 also forms the side seal S of the next film packaging bag G. As shown in FIG. A side seal S forms the bottom of the upwardly tubular film F.
- the side seal portion 110 includes a side heater bar pair 112 .
- the side heater bar pair 112 extends in the left-right direction and is arranged to face each other with the film F sandwiched therebetween in the front-rear direction.
- the side heater bar pair 112 forms a side seal S by heat-sealing a tubular film F.
- the side seals S are formed so that both ends in the left-right direction overlap the seals T3 and B3. As a result, the tubular film F is sealed in the lateral direction, and the lower end of the film F becomes a bag (film packaging bag G).
- the cutter portion 120 is arranged below the side seal portion 110 .
- the cutter unit 120 cuts off the bag body (film packaging bag G) from the film F.
- the cutter section 120 includes a pair of cutter bars 122 .
- the pair of cutter bars 122 extend in the left-right direction and are arranged to face each other across the film F in the front-rear direction.
- the pair of cutter bars 122 vertically divides the side seal S (including the seal T3 and the seal B3) of the film F into two. As a result, the film packaging bag G is cut off from the film F.
- FIG. 5A and 5B are schematic diagrams showing the order of steps from the top sealing step S4 to the separating step S11 of the method for manufacturing the content-filled film packaging bag G, showing the form of the film F.
- FIG. 5 omits the seal T1.
- FIG. 6 is a perspective view showing the correcting step S8 of the method for manufacturing the content-filled film packaging bag G in order of steps.
- the process of manufacturing the content-filled film packaging bag G includes a film feeding and conveying process S1, a top folding process S2, a bottom folding process S3, a top sealing process S4, a bottom sealing process S5, a design cutting process S6, a filling process S7, and a straightening process. It has a step S8, a squeezing step S9, a side sealing step S10, and a separating step S11. Then, the film feeding and conveying process S1, the top folding process S2, the bottom folding process S3, the top sealing process S4, the bottom sealing process S5, the design cutting process S6, the side sealing process S10, the filling process S7, the straightening process S8, and the squeezing process. S9, side sealing step S10, and separation step S11 are performed in this order.
- a band-shaped film F is fed out from the roll of the film supply section 10 .
- the film transport section 70 intermittently transports the film F downstream.
- the film F is sent out at a constant pitch.
- One pitch is the same as the length of the film packaging bag G in the left-right direction (horizontal direction).
- the film feeding/conveying step (conveying step) S1 is continuously performed.
- Top folding step S2 As shown in FIGS. 4A and 4B, the top folding unit 20 folds the film F into a Z-shape (N-shape) at one widthwise side (side edge E1 side).
- the film F passes through the folding plate portion 22 and the pressing roller portion 24 to form a top gusset fold F1.
- the film F passes through the auxiliary top seal portion 26, and a seal T1 is formed on the mountain fold F3 (such as the top of the first pleat G31) of the top gusset folding F1 ( Auxiliary top seal step S2B).
- the first pleat G31 is formed in the top gusset folding F1.
- top sealing step S4 Next, as shown in FIG. 5A, the film F is formed with top seals T (seals T2, T3) at the top seal portion 40.
- top seals T (seals T2, T3) at the top seal portion 40.
- the seal T2 is formed on the film F
- the second pleats G32 are assembled and the film F is formed into a tube at the same time.
- the top gusset G3 is assembled by connecting the vertical ends of the first pleat G31 and the second pleat G32 (overlapping portions where the film F is four-folded).
- the first top heater bar pair 42 heat-welds the vertical ends of the first pleat G31 and the second pleat G32 (overlapping portions where the films F are four-folded) to form a seal T3.
- the second top heater bar pair 44 heat welds the side edges E1 and E2 of the film F to form a seal T2.
- the film F passes through a top seal portion 40 to form a tube, and a top gusset G3 is assembled.
- bottom seals B (seals T1 and T3) at the bottom seal portion 50.
- the first bottom heater bar pair 52 thermally welds a pair of mountain folds F7 (first pleat G41, second pleat G42) of the bottom gusset folding F5 to form a pair of seals B1.
- the second bottom heater bar pair 54 heat-welds the vertical ends of the first pleat G41 and the second pleat G42 (overlapping portions where the films F are four-folded) to form a seal B3.
- the film F passes through the bottom seal portion 50 to assemble the bottom gusset G4.
- Design cutting step S6 trims the contour of the seal T2.
- the film F is cut at the outer edge side of the seal T2 by the design cutter section 60, and a cut piece T2a, a pair of inclined portions T2b and a notch T2c are formed in the seal T2.
- Step S7 the film F is filled with the contents X by the filling section 80 . While the film F is sandwiched between the pair of side heater bars 112, the content X is discharged and filled into the inside of the film F from the filling nozzle 82. As shown in FIG.
- the first correction plate pair 102 presses a portion (accommodating portion G5) extending from the bottom gusset G4 to the top gusset G3. Since the plate members 103 and 104 have symmetrical semi-cylindrical shapes with the film F interposed therebetween, the filled shape of the film F is corrected to a substantially elliptical shape.
- the second correcting plate pair 106 presses the portion (narrow accommodation portion G6) protruding from the top gusset G3.
- the second correcting plate pair 106 flattens the film F (narrow accommodating portion G6) with the stretching piece 107 and the pressing piece 108 .
- the content X is pushed out from the narrow storage portion G6 toward the storage portion G5.
- the vertical form-fill-seal packaging machine 1 repeats the process of manufacturing the film packaging bag G containing contents. As a result, the vertical form-fill-seal packaging machine 1 continuously manufactures a plurality of content-filled film packaging bags G. As shown in FIG.
- the vertical form-fill-seal packaging machine 1 includes a top folding unit 20 that folds the belt-shaped film F into a Z-shape, a bottom folding unit 30 that folds the film F into an M-shape, and a tube-shaped film F.
- a top seal portion 40 forming a top gusset G3 and a spout portion G7, a bottom seal portion 50 forming a bottom gusset G4, and a design cutter portion 60 for trimming the contour of the spout portion G7 are provided.
- the vertical form-fill-seal packaging machine 1 makes the film packaging bag G and fills the content X at the same time. Therefore, a double gusset bag having top gusset G3 and bottom gusset G4 can be efficiently manufactured.
- the top folding unit 20 is provided with an auxiliary top seal portion 26, which heat-welds the mountain fold F3 (first pleat G31) of the top gusset folding F1 to form a part (seal T1) of the top gusset G3. .
- the vertical form-fill-seal packaging machine 1 can satisfactorily manufacture the content-filled film packaging bag G having the top gusset G3.
- the shape of the seal T1 can be arbitrarily set, the film packaging bag G suitable for various uses can be manufactured.
- the vertical form-fill-seal machine 1 includes a squeezing roller section 90 , a correction section 100 and a side seal section 110 .
- the correction unit 100 clamps the film F loaded with the contents X from the front and rear directions to correct the filling shape of the film F.
- the squeezing roller part 90 presses the film F from the front and rear directions and handles it.
- the side seal portions 110 laterally heat-seal the film F to form a bag body (film packaging bag G).
- the vertical form-fill-seal packaging machine 1 can manufacture the content-filled film packaging bag G in which the top gusset G3, the bottom gusset G4, and the spout portion G7 are formed, while quantifying the filling amount. can.
- the correction section 100 includes a first correction plate pair 102 that is in close contact with a portion (accommodating section G5) extending from the bottom gusset G4 to the top gusset G3.
- the first correction plate pair 102 is composed of plate members 103 and 104 each having a semi-cylindrical shape.
- the correction section 100 includes a second correction plate pair 106 that is in close contact with the portion (narrow accommodation section G6) from the top gusset G3 to the outlet section G7.
- the second correction plate pair 106 is composed of an extending piece 107 extending laterally from the plate member 103 and a pressing piece 108 projecting from the plate member 104 and facing the extending piece 107 .
- the vertical form-fill-seal packaging machine 1 can push out the contents X and the air from the narrow storage section G6.
- the quantification of the filling amount of the film packaging bag G is improved by not filling the narrow accommodation portion G6 with the content X.
- FIG. 7 is a perspective view showing a first modification of the content-filled film packaging bag (content-filled film packaging bag H).
- the content-filled film packaging bag H like the content-filled film packaging bag G, has a top gusset H3, a bottom gusset G4, and a spout portion G7.
- top gusset H3 does not have seal T1 of top seal T unlike top gusset G3. That is, the mountain fold F3 (the top of the first pleat H31) of the top gusset folding F1 is not thermally welded.
- the content-filled film packaging bag H is suitable for applications in which the content X is food such as drinking water and the consumer puts the opening in his or her mouth.
- the content-filled film packaging bag G when the consumer puts the opening in his mouth, if the front face G1 faces upward, the seal T1 of the top gusset G3 (first pleat G31) hits the consumer's nose. It can make you feel uncomfortable.
- the seal T1 of the top gusset G3 will hit the chin, which may make the consumer feel uncomfortable.
- the content-filled film packaging bag H has no seal T1 on the first pleat G31 of the top gusset G3, and only the soft first pleat G31 touches the nose and chin, so that the consumer does not feel uncomfortable.
- the auxiliary top sealing portion 26 of the top folding unit 20 can heat-seal the mountain fold F3 (first pleat G31) of the top gusset folding F1 into an arbitrary seal shape.
- the first pleat G31 (mountain fold F3) is not thermally welded. That is, the vertical form-fill-seal packaging machine 1 can arbitrarily set the presence or absence of the seal T1 and its shape, so that the film packaging bag H suitable for food (drinking water) can be manufactured.
- FIG. 8 is a perspective view showing a second modification of the content-filled film packaging bag (content-filled film packaging bag J).
- FIG. 9 is an enlarged front view showing a modification of the vertical form-fill-seal packaging machine 1. As shown in FIG.
- the content-filled film packaging bag J is provided with a plastic spout J8 in place of the cut-off piece T2a. That is, the plug J8 is welded to the upper end of the spout portion G7.
- the plug J8 is composed of a nozzle communicating with the narrow accommodation portion G6 and a cap screwed to the nozzle. Then, the content-filled film packaging bag J is opened by removing the cap from the nozzle of the spout J8.
- the second pleat G32 is formed to have a larger folding width (vertical length) than the first pleat G31.
- the narrow accommodation portion G protrudes upward from the first pleat G31.
- the vertical form-fill-seal machine 1 includes a spout attaching portion 130 .
- the plug attachment section 130 includes a plug supply section 132 and a plug fusing section 134 , which are arranged directly below the driven roller pair 35 .
- the second top heater bar pair 44 is arranged immediately below the first top heater bar pair 42 . Further, the presence or absence and the shape of the second correction plate pair 106 of the correction section 100 are changed according to the projecting length of the narrow accommodation section G6 (the extraction section G7).
- the second pair of correction plates 106 interferes with the plug J8, so the second pair of correction plates 106 is eliminated. do.
- the second correction plate pair 106 is shaped so as not to interfere with the plug J8, and the contents X and air are pushed out from the narrow accommodation portion G6.
- the plug attachment step S12 is performed between the bottom folding step S3 and the top sealing step S4.
- the plug attaching portion 130 thermally welds the plug J8 (base end of the nozzle) between the side edges E1 and E2 of the pair of films F. As shown in FIG.
- the pouring part G7 may have a cut piece T2a that is cut off when unsealing, or may have a plastic plug J8 consisting of a cap and a nozzle. Further, in either case of the cut piece T2a or the plug J8, the projection length of the narrow accommodation portion G6 (the distance from the top gusset G3 to the cut piece T2a and the plug J8) can be set arbitrarily. The presence or absence and shape of the second correction plate pair 106 of the correction section 100 can be arbitrarily set according to the projecting length and shape of the narrow housing portion G6.
- the film packaging bags G, H, and J containing the content X have a spout portion G7 at the top of one (first pleat G31) of the two pleats (first pleat G31, second pleat G32) of the top gusset G3.
- the second pleat G32 on which the spout portion G7 is arranged has a larger folding width than the other first pleat G31. That is, the spout portion G7 of the second pleat G32 protrudes above the first pleat G31. Therefore, the consumer can easily hold the opening (pourout part G7) in his or her mouth.
- the spout portion G7 (the plug G8 and the cut piece T2a) is well formed at the top of the second pleat G32) without welding failure.
- the present invention is not limited to the above-described embodiments, and includes various modifications to the above-described embodiments within the scope of the present invention. That is, the specific shapes, configurations, and the like given in the embodiments are merely examples, and can be changed as appropriate.
- the correction section 100 is not limited to the case where the second correction plate pair 106 is provided in close contact with the narrow accommodation section G6. In other words, not only the case where the content X is pushed out from the narrow storage portion G6 by the second correction plate pair 106, but also the full filling in which the content X spreads even to the narrow storage portion G6 may be performed.
- the film F is not limited to a strip shape, and may be an inflation film or the like. In other words, it is not limited to the case where the side edge portions E1 and E2 of the strip-shaped film F are heat-sealed to form a tubular shape. Alternatively, a plurality of belt-shaped films may be pasted together to form a tubular film.
- the content X is not limited to liquids or fluids (paste), and may be liquids or fluids containing solids. It may also be the case where a liquid or fluid is cooled to solidify.
- the correcting section 100 is not limited to clamping the film F from the front and back directions to correct the filling shape.
- the correction unit 100 may clamp the film F from the left and right to correct the filling shape. That is, the filling shape may be corrected by pressing the top gusset G3 and the bottom gusset G4. Furthermore, the correction section 100 may clamp the film F from the front, rear, left, and right directions to correct the filling shape.
- the correction unit 100 is not limited to the plate-shaped corrector. The shape of the correction body can be appropriately changed according to the shipping shape of the film packaging bag G containing contents.
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Abstract
Description
スタンディングパウチ等の自立袋は、底部が楕円形、頂部が扁平形であるため、立てた姿勢にして輸送用の段ボール箱等に箱詰めすると積載効率(空間容積率)が悪化してしまう。そこで、頂部にもガセットを形成したダブルガセット袋が開発されている。
また、ダブルガセット袋を縦型製袋充填包装機で製造すると、内容物の充填量が安定しないことが判明した。充填時にシャッター弁や重量計を用いず、また包装袋を封止(熱溶着)するときにシゴキローラーを用いる場合に、充填量が安定しない。特に、ダブルガセット袋がトップガセットから突出する注出部を有すると、充填量が安定しないことが判明した。
前記第一矯正板対は、それぞれ半筒形状を有する、ことを特徴とする。
前記矯正部は、前記トップガセットから前記注出部に至る部位に密着する第二矯正板対を備える、ことを特徴とする。
前記第二矯正板対は、前記第一矯正板対の一方から横方向に延伸する延伸片と、前記第一矯正板対の他方から突出して前記延伸片に対向する押圧片と、を備える、ことを特徴とする。
前記注出部は、開封するときに切り落とされる切取片を有する、ことを特徴とする。
前記注出部は、前記フィルムの側縁部同士の間に熱溶着されたプラスチック製の口栓を有する、ことを特徴とする。
前記第一プリーツは、その頂部を長手方向に亘って熱溶着したシールを有し、前記第二プリーツはその頂部を熱溶着したシールを有しない、ことを特徴とする。
前記シールは、前記長手方向の中央が頂部に向かって円弧状に凹んだ形状を有する、ことを特徴とする。
前記二つのプリーツの長手方向の両端同士が熱溶着により固着される、ことを特徴とする。
図1は、内容物入りフィルム包装袋Gを示す図であって、(a)前上方向から見た斜視図である。
内容物入りフィルム包装袋Gは、一枚のプラスチックフィルムFから形成された袋体に内容物Xを充填したものである。
フィルム包装袋Gは、いわゆるダブルガセット袋であり、天面(上部)にトップガセットG3、底面(下部)にボトムガセットG4を有する。
第一プリーツG31と第二プリーツG32は、左右方向の長さが同一であるが、上下方向の幅(折り幅、深さ)が異なる。第一プリーツG31よりも第二プリーツG32が上方に突出する。そして、第二プリーツG32の頂部(山折り)に口栓G8が配置される。
ボトムガセットG4は、第一プリーツG41、第二プリーツG42を有する。第一プリーツG41、第二プリーツG42は、同一形状(長方形)である。第一プリーツG41、第二プリーツG42は、左右方向の長さが同一、上下方向の幅(折り幅、深さ)が左右方向に亘って均一(同一)である。
トップガセットG3とボトムガセットG4は、それぞれ左右方向の両端が溶着される。つまり、第一プリーツG31と第二プリーツG32の左右方向の両端、第一プリーツG41と第二プリーツG42左右方向の両端がそれぞれ接続する。このため、フィルム包装袋Gが略楕円柱形になる。言い換えれば、フィルム包装袋Gは、水平方向の断面が凸レンズ形状またはアーモンド形状になる。
トップシールTは、3つのシール(シールT1、シールT2、シールT3)からなる。
シールT1は、フィルム包装袋Gの前面G1(第一プリーツG31)の上端(山折りF3)を熱溶着して形成される。
シールT2は、フィルム包装袋Gの後面G2(第二プリーツG32)の上端(側縁部E1,E2同士)を熱溶着して形成される。シールT2は、フィルム包装袋Gを開封するときに切り取られる切取片T2aを有する。また、シールT2は、切取片T2aの左右方向両端に繋がる一対の傾斜部T2bを有する。切取片T2aと傾斜部T2bの境界にノッチT2cがそれぞれ形成される。ノッチT2cは、フィルムFを切り裂いて開封口(不図示)を形成するときの起点となる。
切取片T2aと一対の傾斜部T2bは、狭小収容部G6を囲う。狭小収容部G6は、切取片T2aを切り取って形成された開封口から露出する内部空間である。
開封口(開口)が形成される部位を注出部G7という。すなわち、注出部G7は、トップガセットG3から突出する部位である。具体的には、切取片T2aと一対の傾斜部T2bの上端部分(切取片T2aに繋がる部位)である。
シールT3は、フィルム包装袋Gの上部の左右方向両端(フィルムFが四重になった重畳部分)を熱溶着して形成される。シールT3は、第一プリーツG31、第二プリーツG32の左右方向の両端同士を連結(固着)する。
一対のシールB1は、フィルム包装袋Gの前面G1(第一プリーツG41)と後面G2(第二プリーツG42)の下端(山折りF7)をそれぞれ熱溶着して形成される。一対のシールB1は同一形状であり、同時に形成される。
シールB3は、フィルム包装袋Gの下部の左右方向両端(フィルムFが四重になった重畳部分)を熱溶着して形成される。シールB3は、第一プリーツG41、第二プリーツG42の左右方向の両端同士を連結(固着)する。
そこで、フィルムFの外面同士が重なる部位にパンチング孔を設けてもよい。それぞれの外面にパンチング孔を設けて、折り畳んときに対向させる。これにより、フィルムFを四重に折り畳んでも、パンチング孔を介してフィルムFの内面(シーラント層)同士が密着して、良好に熱溶着できる。
フィルム包装袋Gのうち、トップシールT,ボトムシールBに囲まれた部位(天面、底面)は、フィルム包装袋Gの折込マチとして機能する。
収容部G5は、フィルム包装袋Gのうち、熱溶着されていない非シール部(筒状のフィルム)であって、内容物Xが充填封入される空間である。収容部G5は、トップガセットG3の第二プリーツG32に形成された狭小収容部G6に連通する。狭小収容部G6は、トップガセットG3の第二プリーツG32のうち、第一プリーツG31よりも上方に突出する部位である。
図2は、第一実施形態に係る縦型製袋充填包装機1の概略構成を示す正面図である。
縦型製袋充填包装機1は、帯状のフィルムFからダブルガセット形のフィルム包装袋Gを形成すると同時に、このフィルム包装袋Gに内容物Xを充填する。
縦型製袋充填包装機1は、内容物Xの充填量を計測する計測部や充填量を調整するシャッター弁を備えない。
縦型製袋充填包装機1は、内容物Xを連続充填しながら、内容物Xの充填量にバラつきのない内容物入りフィルム包装袋Gを製造する。
縦型製袋充填包装機1におけるフィルムFの長手方向を鉛直方向、上下方向または縦方向ともいう。縦型製袋充填包装機1におけるフィルムFの横方向を左右方向ともいう。縦型製袋充填包装機1におけるフィルムF(フィルム包装袋G)の厚み方向を前後方向ともいう。
フィルム供給部10は、ロール(不図示)からフィルムFを繰り出し、複数の従動ローラー等を経由させる。フィルム供給部10は、フィルムFに弛みや蛇行がないように、一定のテンションを掛けて送り出す。フィルム供給部10は、トップ折畳ユニット20に向けてフィルムFを供給する。
トップ折畳ユニット(トップ折畳部)20は、フィルム供給部10の右斜め上方に配置される。トップ折畳ユニット20は、帯状のフィルムFをZ字形に折り込む。フィルムFは、幅方向の一側部(側縁部E1側)がZ字形に折り込まれて、トップガセット用折込F1が形成される。
トップガセット用折込(第一折込)F1は、フィルムFの側縁部E1側の谷折りF2と中央側の山折りF3からなり、三つ折りとも呼ばれる。トップガセット用折込F1には、第一プリーツG31と第二プリーツG32の片面が同時に形成される。
折り畳み板部22は、フィルムFの搬送方向(右方向)に沿って延在する複数の板部材を有する。フィルムFは、これらの板部材に沿って摺動する。折り畳み板部22は、フィルムFの一側部(側縁部E1側)を下方に押し曲げ、さらに中央に向けて押し込んで、Z字形に折り畳む。谷折りF2から山折りF3の幅よりも谷折りF2から側縁部E1までの幅が大きくなるよう折り畳まれる。第一プリーツG31よりも第二プリーツG32の方が幅が大きく(異なる深さに)形成される。
補助トップシール部26は、ヒーターバー対を有し、このヒーターバー対で山折りF3を挟持して、第一プリーツG31の上端を上下方向に亘って熱溶着する。補助トップシール部26は、フィルムFにシールT1を形成して、トップガセットG3の一部(第一プリーツG31)を組み立てる。
図1に示すように、シールT1は、フィルム包装袋Gを立てた姿勢にしたときに、第一プリーツG31の左右方向の全長に亘って形成され、左右方向に中央が上方向(頂部)に向かって円弧状に凹んだ形状を有する。これにより、第一プリーツG31が搬送途中に弛みや蛇行することなく、その形状を維持したまま、下流に向けて送り出される。
ボトム折畳ユニット(ボトム折畳部)30は、トップ折畳ユニット20の直下に配置される。ボトム折畳ユニット30は、帯状のフィルムFをM字形(W字形)に折り込む。フィルムFは、幅方向の中央がM字形に折り込まれて、ボトムガセット用折込F5が形成される。
ボトムガセット用折込(第二折込)F5は、フィルムFの中央の谷折りF6と、その両側の一対の山折りF7からなり、蛇腹折りとも呼ばれる。ボトムガセット用折込F5には、第一プリーツG41と第二プリーツG42が同時に形成される。
折り畳み板部32は、フィルムFの搬送方向に沿って延在する複数の板部材を有する。フィルムFは、これらの板部材に沿って摺動する。折り畳み板部32は、まず、フィルムFの両側部を押圧してU字形に折り曲げる。さらに、折り畳み板部32は、フィルムFの中央を内側に押し込んでM字形(W字形)に折り畳む。これにより、フィルムFの左側にボトムガセット用折込F5が形成される。
図2の右側に配置された従動ローラー対35は、フィルムFの側縁部E1,E2同士を前後方向(重畳方向)に挟持して密着させる。
図2の左側に配置された従動ローラー対36は、M字形に折り畳んだ部位を前後方向(重畳方向)に押し潰して、フィルムFに折り目(ボトムガセット用折込F5)を付ける。
そして、圧着ローラー部34は、フィルムFを下方に送る。
トップシール部40は、ボトム折畳ユニット30の下方に配置される。トップシール部40は、フィルムFの側縁部E1,E2同士を熱溶着して、シールT2を形成する。フィルムFにシールT2を形成することにより、第二プリーツG32が組み立てられ、同時にフィルムFがチューブ状になる。
また、トップシール部40は、第一プリーツG31と第二プリーツG32の上下方向の両端同士(フィルムFが四重になった重畳部分)を熱溶着してシールT3を形成し、トップガセットG3を組み立てる。
第一トップヒーターバー対42は、第一プリーツG31と第二プリーツG32の上下方向の両端同士(フィルムFが四重になった重畳部分)を前後方向から挟持し、熱溶着してシールT3を形成する。
第二トップヒーターバー対44は、フィルムFの側縁部E1,E2同士を前後方向から挟持し、熱溶着してシールT2を形成する。
トップシール部40を経ることにより、トップガセットG3を有するチューブ状のフィルムFが形成される。
ボトムシール部50は、トップシール部40の側方(左側)および下方に配置される。ボトムシール部50は、ボトムガセット用折込F5を熱溶着して、ボトムシールBを形成する。ボトムシール部50は、第一プリーツG41,第二プリーツG42を有するボトムガセットG4を組み立てる。
第一ボトムヒーターバー対52は、ボトムガセット用折込F5の一対の山折りF7(第一プリーツG41、第二プリーツG42)をそれぞれ挟持し、熱溶着して一対のシールB1を形成する。
第二ボトムヒーターバー対54は、第一プリーツG41と第二プリーツG42の上下方向の両端同士を挟持し、熱溶着してシールB3を形成する。これにより、フィルムFが四重になった重畳部分が熱溶着されて、ボトムガセットG4が組み上がる。
ボトムシール部50を経ることにより、ボトムガセットG4を有するチューブ状のフィルムFが形成される。
デザインカッター部60は、第二トップヒーターバー対44の下方に配置される。デザインカッター部60は、ボトムシール部50の第二ボトムヒーターバー対54とほぼ並列に配置される。
デザインカッター部60は、トップシール部40が形成したトップシールT(シールT2)の輪郭を整える。
デザインカッター部60は、シールT2の外縁側を切り取って、シールT2に切取片T2a、一対の傾斜部T2bおよびノッチT2cを形成する。
フィルム搬送部70は、デザインカッター部60の下方に配置される。
フィルム搬送部70は、フィルムFを下方に向けて間欠搬送する。フィルム搬送部70は、二組の駆動ローラー対を備える。駆動ローラー対は、フィルムFの右側と左側にそれぞれ配置される。各駆動ローラー対は、フィルムFを前後方向に挟持しつつ回転して、フィルムFを下方に送り出す。
充填部80は、フィルム搬送部70の下方において、チューブ状のフィルムFの内部(収容部G5、狭小収容部G6)に内容物Xを連続投入する。
充填部80は、充填ポンプ(不図示)、充填ノズル82を備える。充填ポンプは、内容物Xを充填ノズル82に向けて圧送する。
充填ノズル82は、ボトム折畳ユニット30の側方(右側)からU字形に折り曲げられたフィルムFの内側に挿入される。充填ノズル82は、ボトム折畳ユニット30から真っすぐに下方に延在して、フィルム搬送部70の下方に至る。
充填部80は、充填ポンプを駆動して、チューブ状のフィルムFの内部に向けて充填ノズル82から内容物Xを連続して吐出し続ける。
シゴキローラー部90は、充填ノズル82の下方に配置されて、内容物Xが充填されたチューブ状のフィルムFを扱く。
シゴキローラー部90は、左右方向に延在するシゴキローラー対92を備え、このシゴキローラー対でチューブ状のフィルムFを前後方向に挟持しながら下方に送る。これにより、チューブ状のフィルムFに充填された内容物Xがシゴキローラー対を境にして上下に分断される。チューブ状のフィルムFは、扁平になってサイドシール部110に向けて搬送される。これにより、フィルムFにサイドシールSを確実に形成することが可能になる。
図3は、矯正部100を示す図であって、(a)側面図、(b)斜視図である。
矯正部100は、シゴキローラー部90の直下に配置されて、内容物Xが充填されたチューブ状のフィルムFの充填形状を矯正する。
矯正部100は、シゴキローラー部90が作動する前に、チューブ状のフィルムFの充填形状を前後方向から押圧する。チューブ状のフィルムFのトップガセットG3とボトムガセットG4にまで内容物Xを確実に行き渡らせる。そして、チューブ状のフィルムFに封入される内容物Xの充填量を一定化させる。
第一矯正板対102は、チューブ状のフィルムFのボトムガセットG4からトップガセットG3に亘る部位(収容部G5)を押圧する。第一矯正板対102は、左右方向に延在する板部材103,104であって、フィルムFを前後方向に挟んで対向配置される。
板部材103,104は、フィルムFを挟んで対称な形状を有する。具体的には、板部材103,104は、それぞれ半筒形状を有し、近接し合うとその間に略楕円形の空間を形成する。つまり、板部材103,104により内容物Xが充填されたフィルムFを押圧すると、フィルムFの充填形状が略楕円形に矯正される。
第二矯正板対106は、延伸片107と押圧片108を備える。
延伸片107は、板部材103(第一矯正板対102の一方)から右方向に延伸する部位であり、延伸片107と同様の半筒形状を有する。押圧片108は、板部材104(第一矯正板対102の他方)から後方側に突出して延伸片107に対向する部材であり、延伸片107と同様の半筒形状を有する。
延伸片107と押圧片108は、板部材103,104の近接に伴って移動して、密着する。延伸片107と押圧片108が密着することにより、狭小収容部G6が押し潰されて、収容部G5に向けて内容物Xを押し出す。狭小収容部G6に溜まった空気も収容部G5に向けて押し出される。
サイドシール部110は、矯正部100の下方に配置される。サイドシール部110は、シゴキローラー部90が扁平に押し潰したフィルムFを熱溶着して、サイドシールSを形成する。サイドシールSによりその下方向が封止されて完全な袋体(フィルム包装袋G)になる。
また、サイドシール部110は、次のフィルム包装袋GのサイドシールSも形成する。サイドシールSがその上方向のチューブ状のフィルムFの底部になる。
サイドヒーターバー対112は、チューブ状のフィルムFを熱溶着して、サイドシールSを形成する。サイドシールSは、左右方向の両端がシールT3とシールB3に重なるように形成される。これにより、チューブ状のフィルムFが左右方向に亘って封止され、フィルムFの下端が袋体(フィルム包装袋G)になる。
カッター部120は、サイドシール部110の下方に配置される。カッター部120は、フィルムFから袋体(フィルム包装袋G)を切り落とす。
カッター部120は、カッターバー対122を備える。カッターバー対122は、左右方向に延在して、フィルムFを前後方向に挟んで対向配置される。カッターバー対122は、フィルムFのサイドシールS(シールT3及びシールB3を含む)を上下方向に二分割する。これにより、フィルムFからフィルム包装袋Gが切り落とされる。
次に、縦型製袋充填包装機1を用いて、内容物入りフィルム包装袋Gを製造する工程について説明する。
図4は、内容物入りフィルム包装袋Gの製造方法のトップ折畳工程S2とボトム折畳工程S3を工程順に示す模式図であって、フィルムFの形態(折畳形状)を示す。
図5は、内容物入りフィルム包装袋Gの製造方法のトップシール工程S4から切離工程S11を工程順に示す模式図であって、フィルムFの形態を示す。説明の都合上、図5ではシールT1を省略して図示する。
図6は、内容物入りフィルム包装袋Gの製造方法の矯正工程S8を工程順に示す斜視図である。
そして、フィルム供給搬送工程S1、トップ折畳工程S2、ボトム折畳工程S3、トップシール工程S4、ボトムシール工程S5、デザインカット工程S6、サイドシール工程S10、充填工程S7、矯正工程S8、シゴキ工程S9、サイドシール工程S10、切離工程S11の順に行われる。
まず、フィルム供給部10のロールから帯状のフィルムFが繰り出される。フィルム搬送部70がフィルムFを下流に向けて間欠搬送する。フィルムFは、一定のピッチで送り出される。1ピッチは、フィルム包装袋Gの左右方向(横方向)の長さと同一である。
フィルム供給搬送工程(搬送工程)S1は、継続して行われる。
図4(a),(b)に示すように、フィルムFは、トップ折畳ユニット20において、幅方向の一側部(側縁部E1側)がZ字形(N字形)に折り込まれる。フィルムFは、折り畳み板部22と圧着ローラー部24を経て、トップガセット用折込F1が形成される。
さらに、図4(c)に示すように、フィルムFは、補助トップシール部26を経て、トップガセット用折込F1の山折りF3(第一プリーツG31の頂部等)にシールT1が形成される(補助トップシール工程S2B)。これにより、トップガセット用折込F1に第一プリーツG31が形成される。
次に、図4(d)に示すように、フィルムFは、ボトム折畳ユニット30の折り畳み板部32において、両側部を押圧されてU字形に折り曲げられる(二つ折りになる)。続いて、図4(e)に示すように、フィルムFは、折り畳み板部32において、フィルムFの中央が内側に押し込まれてM字形(W字形)に折り込まれて、ボトムガセット用折込F5が形成される。
さらに、フィルムFは、ボトム折畳ユニット30の圧着ローラー部34を経て、トップガセット用折込F1とボトムガセット用折込F5が押し潰されて扁平化される。
次に、図5(a)に示すように、フィルムFは、トップシール部40において、トップシールT(シールT2,T3)が形成される。
フィルムFにシールT2が形成されると、第二プリーツG32が組み立てられ、同時にフィルムFがチューブ状になる。フィルムFにシールT3が形成されると、第一プリーツG31と第二プリーツG32の上下方向の両端同士(フィルムFが四重になった重畳部分)が接続して、トップガセットG3が組み立てられる。
続いて、第二トップヒーターバー対44がフィルムFの側縁部E1,E2同士を熱溶着してシールT2を形成する。
フィルムFは、トップシール部40を経てチューブ状になり、さらにトップガセットG3が組み立てられる。
次に、図5(a)に示すように、フィルムFは、ボトムシール部50において、ボトムシールB(シールT1,T3)が形成される。
まず、第一ボトムヒーターバー対52がボトムガセット用折込F5の一対の山折りF7(第一プリーツG41、第二プリーツG42)をそれぞれ熱溶着して一対のシールB1を形成する。
続いて、第二ボトムヒーターバー対54が第一プリーツG41と第二プリーツG42の上下方向の両端同士(フィルムFが四重になった重畳部分)を熱溶着してシールB3を形成する。
フィルムFは、ボトムシール部50を経て、ボトムガセットG4が組み立てられる。
次に、図5(b)に示すように、フィルムFは、デザインカッター部60において、シールT2の輪郭が整えられる。
フィルムFは、デザインカッター部60によりシールT2の外縁側を切り取られ、シールT2に切取片T2a、一対の傾斜部T2bおよびノッチT2cが形成される。
次に、図5(c)に示すように、フィルムFは、サイドシール部110において、サイドシールSが形成される。サイドシール部110は、サイドヒーターバー対112によりフィルムFを熱溶着してサイドシールSを形成する。
これにより、チューブ状のフィルムFに底部が形成される。
次に、フィルムFは、充填部80により内容物Xが充填される。フィルムFがサイドヒーターバー対112に挟持されているときに、充填ノズル82からフィルムFの内部に内容物Xが吐出、充填される。
次に、図6(a),(b)に示すように、フィルムFは、矯正部100により充填形状が矯正される。フィルムFは、内容物Xが充填された状態で、第一矯正板対102と第二矯正板対106により前後方向から押圧される。これにより、フィルムFの内部で偏在していた内容物Xが、フィルムFの内部の隅々まで行き渡る。
第二矯正板対106は、延伸片107と押圧片108によりフィルムF(狭小収容部G6)を扁平に押し潰す。
これにより、狭小収容部G6から内容物Xが収容部G5に向けて押し出される。
次に、図5(c)に示すように、フィルムFは、シゴキローラー部90により扱かれる。矯正部100の直上に配置されたシゴキローラー対92によりフィルムFが挟持される。
シゴキローラー対92は、矯正部100がフィルムFを押圧するまで、僅かに離間して待機する。そして、矯正部100によりフィルムFの充填形状が矯正された後に、シゴキローラー対92が密着してフィルムFを扁平に押し潰す。これにより、フィルムFに封入される内容物Xの充填量が一定化(定量化)される。
続いて、矯正部100がフィルムFから離間すると、フィルムFが下方に送られる。シゴキローラー対92は、フィルムFを押し潰した状態を維持する。これにより、余計な内容物Xがシゴキローラー対92の上方向に残る。
次に、図5(c)に示すように、フィルムFは、サイドシール部110において、サイドシールSが形成される。サイドヒーターバー対112は、シゴキローラー対92により押し潰されたフィルムFを熱溶着してサイドシールSを形成する。これにより、フィルムFの下端が完全な袋体(フィルム包装袋G)になる。
次に、図5(c)に示すように、フィルムF(フィルム包装袋G)は、カッター部120において、サイドシールSが切断される。サイドシールSが上下に二分割されて、フィルムFから内容物入りのフィルム包装袋Gが切り落とされる。
縦型製袋充填包装機1は、内容物入りフィルム包装袋Gを製造する工程を繰り返す。これにより、縦型製袋充填包装機1は、複数の内容物入りフィルム包装袋Gを連続して製造する。
これにより、縦型製袋充填包装機1は、フィルム包装袋Gの製袋と内容物Xの充填を同時に行う。したがって、トップガセットG3とボトムガセットG4を有するダブルガセット袋を効率よく製造できる。
これにより、縦型製袋充填包装機1は、トップガセットG3を有する内容物入りフィルム包装袋Gを良好に製造することができる。特に、シールT1の形状を任意に設定できるので、様々な用途に適したフィルム包装袋Gを製造できる。
第二矯正板対106は、板部材103から横方向に延伸する延伸片107と、板部材104から突出して延伸片107に対向する押圧片108からなる。これにより、縦型製袋充填包装機1は、狭小収容部G6から内容物Xと空気を押し出すことができる。狭小収容部G6に内容物Xを充填させないことにより、フィルム包装袋Gの充填量の定量化が向上する。
内容物入りフィルム包装袋Hは、内容物入りフィルム包装袋Gと同様に、トップガセットH3、ボトムガセットG4および注出部G7を有する。
しかし、トップガセットH3は、トップガセットG3とは異なって、トップシールTのシールT1を有しない。つまり、トップガセット用折込F1の山折りF3(第一プリーツH31の頂部)が熱溶着されていない。
内容物入りフィルム包装袋Gでは、消費者が開封口を口にくわえるとき、前面G1が上方を向いていると、トップガセットG3(第一プリーツG31)のシールT1が鼻に当たってしまうため、消費者を不快にさせてしまうおそれがある。消費者が開封口を口にくわえるとき、前面G1が下方を向いていると、トップガセットG3のシールT1が顎に当たってしまうため、消費者を不快にさせてしまうおそれがある。
これに対して、内容物入りフィルム包装袋Hは、トップガセットG3の第一プリーツG31にシールT1がなく、柔らかい第一プリーツG31が鼻や顎に当たるだけなので、消費者を不快にさせない。
このように、縦型製袋充填包装機1は、トップ折畳ユニット20の補助トップシール部26がトップガセット用折込F1の山折りF3(第一プリーツG31)を任意のシール形状に熱溶着できる(補助トップシール工程S2B)。第一プリーツG31(山折りF3)を熱溶着しないことも設定できる。つまり、縦型製袋充填包装機1は、シールT1の有無やその形状を任意に設定できるので、食品(飲料水)に適したフィルム包装袋Hを製造できる。
図9は、縦型製袋充填包装機1の変形例を示す拡大正面図である。
第二プリーツG32は、第一プリーツG31よりも折り幅(上下方向の長さ)が大きく形成される。狭小収容部Gが第一プリーツG31よりも上方に突出する。
口栓取付部130を設けた場合には、第二トップヒーターバー対44が第一トップヒーターバー対42の直下に配置される。また、狭小収容部G6(注出部G7)の突出長さに応じて、矯正部100の第二矯正板対106の有無や形状が変更される。狭小収容部G6の突出長さ(トップガセットG3から口栓J8までの距離)が短い場合は、第二矯正板対106が口栓J8に干渉してしまうため、第二矯正板対106を廃止する。
一方、狭小収容部G6の突出長さが十分に長い場合は、第二矯正板対106を口栓J8に干渉しない形状にして、狭小収容部G6から内容物Xと空気を押し出す。
また、切取片T2aと口栓J8のいずれの場合であっても、狭小収容部G6の突出長さ(トップガセットG3から切取片T2a,口栓J8までの距離)は任意に設定できる。そして、狭小収容部G6の突出長さや形状に応じて、矯正部100の第二矯正板対106の有無や形状も任意に設定できる。
矯正部100は、板形の矯正体を備える場合に限らない。矯正体の形状は、内容物入りフィルム包装袋Gの出荷形状に合わせて、適宜変更可能である。
Claims (19)
- 帯状のフィルムの側部をZ字形に折り畳んで第一折込を形成するトップ折畳部と、
前記フィルムの中央をM字形に折り畳んで第二折込を形成するボトム折畳部と、
前記第一折込と前記フィルムの側縁部同士を熱溶着して、前記フィルムをチューブ状にすると共に、トップガセットと前記トップガセットから突出する注出部を形成するトップシール部と、
前記第二折込を熱溶着してボトムガセットを形成するボトムシール部と、
を備える、縦型製袋充填包装機。 - 前記トップ折畳部は、前記第一折込の山折りを熱溶着して前記トップガセットの一部を形成する補助トップシール部を備える、請求項1に記載の縦型製袋充填包装機。
- 前記フィルムを下方に搬送する搬送部と、
前記フィルムの内部に内容物を連続投入する充填部と、
前記内容物が投入された前記フィルムを前後方向から挟持して前記フィルムの充填形状を矯正する矯正部と、
前記矯正部の上方に配置されて、前記フィルムを前後方向から押圧して扱くシゴキローラー部と、
前記矯正部の下方に配置されて、前記フィルムを横方向に熱溶着して袋体を形成するサイドシール部と、
前記フィルムから前記袋体を切り離すカッター部と、
を備える、請求項1または2に記載の縦型製袋充填包装機。 - 前記矯正部は、前記ボトムガセットから前記トップガセットに亘る部位に密着する第一矯正板対を備える、請求項3に記載の縦型製袋充填包装機。
- 前記第一矯正板対は、それぞれ半筒形状を有する、請求項4に記載の縦型製袋充填包装機。
- 前記矯正部は、前記トップガセットから前記注出部に至る部位に密着する第二矯正板対を備える、請求項4または5に記載の縦型製袋充填包装機。
- 前記第二矯正板対は、
前記第一矯正板対の一方から横方向に延伸する延伸片と、
前記第一矯正板対の他方から突出して前記延伸片に対向する押圧片と、
を備える、請求項6に記載の縦型製袋充填包装機。 - 前記注出部の輪郭を整えるデザインカッター部を備え、
前記注出部は、開封するときに切り落とされる切取片を有する、請求項1から7のうちいずれか一項に記載の縦型製袋充填包装機。 - 前記注出部は、前記フィルムの側縁部同士の間に熱溶着されたプラスチック製の口栓を有する、請求項1から7のうちいずれか一項に記載の縦型製袋充填包装機。
- 帯状のフィルムの側部をZ字形に折り畳んで第一折込を形成するトップ折畳工程と、
前記フィルムの中央をM字形に折り畳んで第二折込を形成するボトム折畳工程と、
前記第一折込と前記フィルムの側縁部同士を熱溶着して、前記フィルムをチューブ状にすると共に、トップガセットと前記トップガセットから突出する注出部を形成するトップシール工程と、
前記第二折込を熱溶着してボトムガセットを形成するボトムシール工程と、
を有する、内容物入りフィルム包装袋の製造方法。 - 前記トップ折畳工程は、前記第一折込の山折りを任意のシール形状に形成する補助トップシール工程を含む、請求項10に記載の内容物入りフィルム包装袋の製造方法。
- 前記フィルムを下方に搬送する搬送工程と、
前記フィルムの内部に内容物を連続投入する充填工程と、
前記フィルムを矯正部により前後方向から挟持して前記フィルムの充填形状を矯正する矯正工程と、
前記矯正部の上方に配置されたシゴキローラー部により前記フィルムを前後方向から押圧して扱くシゴキ工程
前記矯正部の下方に配置されたサイドシール部により前記フィルムを横方向に熱溶着して袋体を形成するサイドシール工程と、
カッター部により前記フィルムから前記袋体を切り離す切離工程と、
を有する、請求項10または11に記載の内容物入りフィルム包装袋の製造方法。 - フィルム包装袋に流動体を充填封入した内容物入りフィルム包装袋であって、
前記フィルム包装袋の天面のフィルムがM字形に重なるトップガセットと、
前記フィルム包装袋の底面のフィルムがM字形に重なるボトムガセットと、
前記トップガセットが有する二つのプリーツの一方の頂部に配置された注出部と、
を備え、
前記二つのプリーツは、前記注出部が配置された第一プリーツが他方の第二プリーツよりも折り幅が大きい、内容物入りフィルム包装袋。 - 前記第一プリーツおよび前記第二プリーツは、その頂部を長手方向に亘って熱溶着したシールをそれぞれ有する、請求項13に記載の内容物入りフィルム包装袋。
- 前記第一プリーツは、その頂部を長手方向に亘って熱溶着したシールを有し、前記第二プリーツはその頂部を熱溶着したシールを有しない、請求項13に記載の内容物入りフィルム包装袋。
- 前記シールは、前記長手方向の中央が頂部に向かって円弧状に凹んだ形状を有する、請求項14または15に記載の内容物入りフィルム包装袋。
- 前記二つのプリーツの長手方向の両端同士が熱溶着により固着される、請求項13から16のうちいずれか一項に記載の内容物入りフィルム包装袋。
- 前記注出部は、前記フィルムの側縁部同士を熱溶着して形成された切取片を有し、
前記切取片を切り落して前記流動体を取り出す開口を形成する、請求項13から17のうちいずれか一項に記載の内容物入りフィルム包装袋。 - 前記注出部は、プラスチック製の口栓であり、
前記口栓が前記フィルムの側縁部同士の間に配置されて固着される、請求項13から17のうちいずれか一項に記載の内容物入りフィルム包装袋。
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