JP6553876B2 - Air spraying mechanism, top seal device, corner seal packing machine and top seal method - Google Patents

Description

  The present invention relates to an air blowing mechanism, a top seal device, a corner seal packaging machine, and a top seal method.

  In a line for pillow-wrapping articles such as foods and daily necessities, articles are supplied one after another to a packaging machine, and individually packaged with a film to produce a package (see, for example, Patent Document 1).

  In the bag making machine of the packaging machine, the film is continuously fed from the raw fabric by being sequentially fed out in accordance with the sequential supply of the articles, and the bag is formed into a tubular shape. Next, in the center seal device, both end edges (center seal portions) in the width direction of the films stacked on each other are heated while being sandwiched between a pair of bar sealers, and then pressed with a press roller, thereby the center seal. (Vertically sealed). Then, in the top seal device, for each pitch according to the length of the article, the top seal (lateral seal) and cut are performed in the width direction of the film, and the package is manufactured.

  When a package with a corner seal portion (hem seal portion, edge portion) (see, for example, Patent Document 2) is manufactured by a bag making machine (see Patent Document 3), the supplied film is As it is, the corner seal portion is formed.

  Further, in a package having a gusset (see, for example, Patent Document 2), the side surface of the cylindrical film is pushed inward to be folded and a top seal is provided. For the pressing of the side surface of the cylindrical film, a pressing piece (for example, see Patent Document 4) or a jet of pressure fluid (for example, see Patent Document 5) is used.

Japanese Patent No. 5038846 (see FIG. 1) Japanese Patent No. 5156568 (see FIG. 1) International Publication No. 01/024999 (See FIGS. 1 and 5) JP 2004-967 A (see FIG. 3) Japanese Patent Laid-Open No. 48-6893 (see FIG. 2)

  For example, in the bag making and packaging machine of Patent Document 3, the corner seal portion is formed on the film with the folds upright, but the corner seal portion is either by a roller or the like arranged downstream thereof. Only one side will lie down and crease will stick.

  An example of the film in the state in which the crease is attached to the corner seal portion is shown in FIG. As described above, in the conventional bag making machine, the corner seal portion formed on the film is strongly laid down in one direction and is creased. Therefore, although it is an unknown problem at the time of this application, when this film is formed into a cylindrical shape and an article is wrapped with a packaging machine and center sealing is performed, as shown in FIG. It falls down toward the side where it is formed (see arrow).

  In FIG. 11, the deformation | transformation process of the top seal part vicinity at the time of performing a top seal with a packaging machine using this cylindrical film with a corner seal part is shown.

  As shown in FIG. 11A, the corner seal portion of the cylindrical film falls down so as to form an acute angle A with the side surface on which the gusset is formed by the strong fold. In this state, as shown in FIG. 11 (B), the top sealer comes in contact with the upper surface of the cylindrical film and tries to hold it further. The corner seal portion is deformed to be in a horizontal state along the contact surface of the top sealer (see arrows). Since a crease (see angle A) remains in the vicinity of the corner seal portion, when the corner seal portion is horizontal, the side film in the vicinity is curved outward so as to be engaged with the acute angle A fold.

  Next, as shown in FIG. 11C, at the same time as the top sealer sandwiches the tubular film, in order to make a crease at the center of the side surface, a gusset nail is inserted from both sides. By this gusset nail, only the side center of the cylindrical film is curved toward the inside, and the film in the vicinity of the corner seal is still curved toward the outside, so the film near the corner seal at the top seal Will be top sealed in a folded state. According to the present inventors, it has been revealed that this phenomenon is particularly noticeable when the product height is high (the width of the gusset is large).

  In addition, the package is not limited to a package having a corner seal portion, but a package that does not have a corner seal portion (such as a crease in a corner portion) such as a package that wraps a cylindrical article, for example When a portion (corresponding to a portion) is pushed inward to be folded and top-sealed, the film may be top-sealed in a folded state.

  This invention is made in view of the said subject, and it aims at providing the corner seal apparatus which can improve the finish of a package body, and a packaging machine.

(1) The present invention provides a pushing means for pushing a predetermined folding position of a part of both side surfaces of the tubular film in the traveling direction from the outside to the inside of the tubular film, and the tubular film at the folding position. When the top seal portion is formed by folding the tubular film with a top sealer from above and below in the traveling direction, the outer side of the tubular film is positioned closer to the upper and lower surfaces of the tubular film than the folded position. from inwardly possess the air nozzle for blowing air, the tubular film is a corner sealing portion is provided at an end portion of the upper and lower surfaces, the air nozzle in the vicinity of the corner sealing portions of the tubular film side blowing air, an air blowing mechanism, characterized in that.

(2) The present invention is also the air spraying mechanism according to the above (1), characterized in that the air nozzle is mounted movably in the vertical direction together with the top sealer .

(3) The present invention also includes a pushing means for pushing in a predetermined folding position of a part of both side surfaces of the tubular film in the traveling direction from the outside to the inside of the tubular film, and the folding position of the tubular film. And forming the top seal part by sandwiching the tubular film from above and below in the traveling direction with a top sealer, the position of the tubular film is closer to the upper and lower surfaces of the tubular film than the folded position. and a air nozzle for blowing air from the outside to the inside, the air nozzle mounted movably with vertically the top sealer, an air blowing mechanism, characterized in that.

  (4) In the invention, any one of the above (1) to (3), wherein the air nozzle blows air when the top sealer contacts the upper and lower surfaces of the tubular film. It is an air blowing mechanism as described.

  (5) The present invention is also characterized in that the air nozzle is positioned closer to the center of the cylindrical film than the sealing surface of the top sealer when blowing air. An air blowing mechanism according to any one of the above.

  (6) The present invention also includes the air blowing mechanism according to any one of the above (1) to (5), and the top sealer, and seals the tubular film in the width direction at predetermined intervals. It is a top seal device that cuts.

  (7) The present invention also provides a supply device for supplying a film, a corner seal device for forming a corner seal portion on the film supplied from the supply device, and the film having the corner seal portion formed thereon. A bag-making apparatus for forming a cylindrical film by bending in a direction, a center seal apparatus for performing a center seal on the cylindrical film downstream of the bag-making apparatus, and any one of the above (1) to (5) A corner seal wrapping machine comprising: the air spray mechanism; and the top sealer that seals and cuts the tubular film on which the center seal is applied at a predetermined interval in the width direction. is there.

  (8) The present invention is also the corner seal packaging machine according to the above (7), wherein the top sealer and the air blowing mechanism move along the same locus.

(9) The present invention also provides a top sealing method at the corner seal packaging machine which forms a top seal portion with folded at a predetermined folding position by a portion of the pushing means on both sides in the traveling direction of the tubular film, wherein the corner sealing portion formed at an end portion of the upper and lower surfaces of the tubular film before the formation of the top seal portion, the cylindrical a position closer to the upper and lower surfaces of the traveling direction of the tubular film than the folded position The air is blown from the air nozzle toward the inside from the outside of the cylindrical film to the vicinity of the corner seal portion on the side of the cylindrical film.

(1 0 ) The present invention is also characterized in that air is blown when a top sealer that forms the top seal portion sandwiching the tubular film from above and below in the traveling direction contacts the upper and lower surfaces of the tubular film. The top sealing method according to (9) above.

  According to the air blowing mechanism, the top seal device, the corner seal packaging device, and the top seal method according to the above (1) to (11) of the present invention, the film near the corner seal portion is folded and sealed at the time of top sealing. Since it can be prevented from becoming wrinkles, the finish of the package can be improved.

It is the schematic of the corner seal packaging machine which concerns on embodiment of this invention. It is a perspective view of the back surface of the film in which the corner seal part was formed. (A) is an external appearance perspective view which looked at a package body from the downward direction, (B) is sectional drawing of a package body. (A), (B) is a side view of a film explaining the process in which a corner seal part is formed. (A) is a front view of an air blowing mechanism, (B) is a side view of an air blowing mechanism, (C) is a side view which shows the blowing position of air. It is a side view of the film explaining the process in which a top seal part is formed. It is a side view of the film explaining the process in which a top seal part is formed. It is a figure which shows the other form of the air spraying mechanism of this invention. (A) is a side view of the conventional film in which the corner seal part was formed, (B) is sectional drawing of the conventional package. (A)-(C) are sectional drawings which show the deformation | transformation process at the time of performing a top seal with respect to the conventional cylindrical film in which the corner seal part was formed.

  Hereinafter, the configuration of the corner seal packaging machine 1 according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a corner seal packaging machine 1. In the drawings and the subsequent drawings, a part of the configuration is appropriately omitted to simplify the drawings. And in this figure and each subsequent figure, the magnitude | size, shape, thickness, etc. of a member are exaggerated suitably and expressed.

  A corner seal packaging machine 1 shown in FIG. 1 is used in a line for sequentially packaging articles XA1 such as food and daily necessities with a film YA1. The corner seal packaging machine 1 includes an article supply device 2, a film supply device 3, a packaging machine body 4, a control unit (not shown), and the like.

  Each part of the corner seal packaging machine 1 is generally controlled by a control unit. The control unit comprises a CPU, a RAM, a ROM and the like, and executes various controls. The CPU is a so-called central processing unit, and various programs are executed to realize various functions. The RAM is used as a work area for the CPU. The ROM stores a basic OS and programs executed by the CPU.

  The article supply device 2 conveys the article XA1 at regular intervals and sequentially conveys the article XA1 to the downstream packaging machine body 4. This article supply apparatus 2 is configured by a finger conveyor. Specifically, the article supply device 2 includes a conveyance surface (not shown) having a slit, a side guide (not shown) for guiding the article XA1 on the conveyance surface from the side, a driving sprocket 5, and a driven member. Sprockets (not shown), an annular chain 6 running over the sprockets, a plurality of fingers 7 attached to the chain 6 at equal intervals, and a servo motor (not shown) as a power source Omitted) and etc.

  The drive sprocket is rotated by the drive of the servo motor. The driven sprocket 5 rotates in conjunction with the driving sprocket as the chain 6 travels. The chain 6 travels so as to circulate by the rotation of the driving sprocket. The plurality of fingers 7 project upward from below the transport surface via the slits. The plurality of fingers 7 travel on the transport surface as the chain 6 travels. Thereby, the plurality of fingers 7 push the article XA1 on the conveyance surface and send it out to the packaging machine main body 4.

  The film supply device 3 forms the corner seal portions (hem seal portions) HE1 to HE4 (see FIG. 2) on the film YA1 exhibiting a strip shape, and continuously supplies the film YA1 to the downstream packaging machine main body 4. That is, the film supply device 3 functions as a supply device that supplies the film YA1, and also functions as a corner seal device that forms the corner seal portions HE1 to HE4 on the film YA1 supplied from the supply device.

  Here, the configuration of the film YA1 in which the corner seal portions HE1 to HE4 are formed will be described with reference to FIG. FIG. 2 is a perspective view of the back surface of the film YA1 on which the corner seal portions HE1 to HE4 are formed.

  As shown in FIG. 2, a plurality of (four in this embodiment) corner seal portions HE1 to HE4 along the flow direction are formed on the film YA1 so as to be spaced from each other. .

  Referring back to FIG. Specifically, the film supply device 3 includes a raw material shaft 8, a servomotor (not shown), a guide roller 9, a corner seal portion forming means 10, a guide roller 13 and the like.

  The original fabric shaft 8 holds the original fabric roll YB1 rotatably. The original fabric shaft 8 is powered by the servomotor to rotate, and rotates the held original fabric roll YB1. Thereby, film YA1 is drawn out (stretched) from original fabric roll YB1. The guide roller 9 guides the film YA1 fed from the original fabric roll YB1 and feeds it to the corner seal portion forming means 10.

  The corner seal portion forming means 10 includes a plurality (four in this embodiment) of corner seal portions HE1 along the flow direction (longitudinal direction) on the film YA1 continuously drawn out via the guide roller 9. The HEs 4 (see FIG. 2) are simultaneously formed to be spaced apart from one another. Specifically, the corner seal portion forming means 10 is a predetermined direction (the direction of the arrow in FIG. 4B) by laying the belt-like film YA1 at least in an outer tri-fold so as to be continuous in the longitudinal direction. After forming the creases, the corner seals HE1 to HE4 are formed by heat-sealing the creases on their sides. That is, the corner seal portion forming means 10 forms a fold that is continuous in the longitudinal direction of the belt-shaped film YA1, and heat-seal the fold by heat-sealing the film YA1 in a state where the fold is laid down, Corner seal portions HE1 to HE4 are formed. As a result, as shown in FIG. 2, the corner seal portions HE1 to HE4 are formed so as to fall in a predetermined direction. Thereafter, the corner seal portion forming means 10 sends the film YA1 on which the corner seal portions HE1 to HE4 are formed to the guide roller 13. The guide roller 13 feeds the film YA1 to the packaging machine main body 4.

  In addition, as a method of drawing out film YA1 from original fabric roll YB1, a feed roller is separately provided instead of adopting the method of the above-mentioned original fabric drive type, and the feed roller driven type which pulls out film YA1 by moving the feed roller. The method of may be adopted.

  The packaging machine body 4 wraps the article XA1 supplied from the article supply device 2 with the film YA1 supplied from the film supply device 3. Specifically, the packaging machine main body 4 includes the bag making device 14, the pinch roller 15, the center seal device 16, the first conveyance device 17, the upper pressing device 18, and the top seal device (end seal device) 19. And a second transfer device 20.

  The bag making device 14 forms the film YA1 supplied from the film supply device 3 into a cylindrical shape so that both edges in the width direction overlap each other. Further, the bag making device 14 supplies the article XA1 supplied from the article supply device 2 to the film YA1 that is manufactured in a cylindrical shape. Thereby, the article XA1 is wrapped in the film YA1 formed into a tubular shape. That is, the bag making device 14 functions as a bag making device that bends the film YA1 on which the corner seal parts HE1 to HE4 are formed in the width direction to form a tubular shape.

  The pinch roller 15 sandwiches both end edges of the film YA1 overlapping each other (hereinafter referred to as a center seal portion CE1 (see FIG. 3)) to apply a transport force to the center seal portion CE1.

  The center seal device 16 includes a pair of versealers 16 a and a press roller 16 b. The center seal device 16 heats by sandwiching the center seal portion with a pair of versealers 16a. The center seal device 16 performs center sealing by pressing the heated center seal portion with the press roller 16b. That is, the center seal device 16 applies a center seal to the cylindrically formed film YA1 downstream of the bag making device 14.

  The first transport device 17 carries the center-sealed cylindrical film YA1 together with the article XA1 wrapped in the film YA1 on the transport surface (reference number omitted) toward the top seal device 19. The first transport device 17 expands and contracts the transport surface in the transport direction in accordance with the box motion of the top seal device 19.

  The upper pressing device 18 is disposed above the first transfer device 17 and suppresses the article XA1 transferred to the first transfer device 17 from above along with the film YA1. Thereby, the article XA1 is conveyed while maintaining the horizontal state.

  The top seal device 19 folds a part of both side surfaces (gusset) in the advancing direction of the tubular film YA1 at a predetermined folding position and sandwiches the film YA1 with the top sealers 19a and 19b from the vertical direction in the advancing direction. That is, a top seal (end seal, lateral seal) is formed in the width direction of the film YA1 at every pitch corresponding to the length of the article XA1 by a known box motion in which a pair of upper and lower top sealers 19a and 19b are revolved along a predetermined locus. ) And cutting, and the package ZA1 (see FIGS. 3A and 3B) is manufactured. In other words, the top seal device 19 seals and cuts the center-sealed film YA1 in the width direction at a predetermined interval to form the top seal portion TO1. For details of the top seal device 19, refer to, for example, JP-A-09-286413. The top seal device 19 may be a rotary top seal device.

  The air blowing mechanism 60 is provided in the top seal device 19. When forming the top seal portion TO1, the air blowing mechanism 60 blows air from the outside to the inside of the film YA1 with respect to a position closer to the upper and lower surfaces of the film YA1 than the folding position of the gusset. The air blowing mechanism 60 will be described in detail later.

  Here, the configuration of the package ZA1 will be described with reference to FIGS. 3 (A) and 3 (B). FIG. 3A is an external perspective view of the package ZA1 as viewed from below. FIG. 3B is a cross-sectional view of the package ZA1.

  As shown in FIG. 3, corner seal portions HE1 to HE4 are formed at four corners along the longitudinal direction of the package ZA1. Then, on the bottom surface of the package ZA1, one center seal portion CE1 along the longitudinal direction is formed so as to be parallel to the corner seal portions HE1 to HE4. In addition, a pair of top seal portions TO1 along the short direction is formed at both ends in the longitudinal direction of the package ZA1.

  Referring back to FIG. The second transfer device 20 takes over the package ZA1 from the top seal device 19, places it on the transfer surface 20a, and transfers it. The second transfer device 20 stretches the transfer surface 20 a in the transfer direction in accordance with the box motion of the top seal device 19.

  Next, a process in which the corner seal portions HE1 to HE4 are formed on the film YA1 will be described with reference to FIGS. 4A and 4B illustrate a process in which the corner seal portions HE1 to HE4 are formed.

  As shown in FIG. 4A, the film YA1 is unwound from the original fabric roll YB1 (see FIG. 1) and is unfolded.

  Then, the unfolded film YA1 is sent to the corner seal portion forming means 10 (see FIG. 1). As shown in FIG. 4B, a plurality (four in this embodiment) of corner seal portions HE1 to HE4 are formed on the film YA1 so as to have a crease in a predetermined direction (the direction of the arrow). Be done.

  The air blowing mechanism 60 and the top seal device 19 will be described with reference to FIG. Fig. 5 (A) is a side view (a side view corresponding to the cross section of Fig. 3 (B)) showing the top seal device 19 at the arrow V1 of the package ZA1 shown in Fig. 3 (A). B) is a side view showing the top seal device 19 in the direction of arrow V2. FIG. 5C is a side view corresponding to FIG. 5B and shows an air blowing position SP by the air blowing mechanism 60. Each figure also shows a state before the top sealers 19a and 19b press the film YA1 (when it comes into contact with the film YA1).

  As shown in FIGS. 4A and 4B, the top seal device 19 is configured such that a part of both side surfaces S1 and S2 in the traveling direction of the tubular film YA1 is folded at a folding position FP (of the package ZA1). In the same direction (thickness direction), that is, in the same figure (A) and (B), the side surfaces S1 and S2 are folded at the center in the vertical direction and the tubular film YA1 is sandwiched between the top sealers 19a and 19b from the top and bottom in the traveling direction Form the top seal portion TO1.

  And as shown to the same figure (A)-(C), when forming the top seal | sticker part TO1, the air blowing mechanism 60 is with respect to the spraying position SP nearer to the upper surface S3 and the lower surface S4 of the film YA1 than the folding position FP. Air is blown inward from the outside of the film YA1.

  The air blowing mechanism 60 has air nozzles 61a, 61b, 61c, 61d. The air nozzles 61a to 61d are attached to the mounts 70a and 70b of the top sealers 19a and 19b by brackets 62a, 62b, 62c and 62d, respectively.

  Specifically, as shown in FIG. 5A, brackets 62a and 62c extending downward are fixed to the upper mounting base 70a on both sides of the top sealer 19a, and air nozzles 61a and 61c are attached to the respective tips. Is attached. In addition, brackets 62b and 62d extending upward are fixed to both sides of the top sealer 19b, and air nozzles 61b and 61d are attached to the tips of the lower mounting base 70b shown in FIG. Thereby, the air nozzles 61a to 61d move along the same locus as the top sealer 19a or the top sealer 19b.

  In the thickness direction of the package ZA1, the air nozzles 61a and 61c are lowered (projected) from the center (folding position FP) of the package ZA1 from the sealing surface of the top sealer 19a before pressing the film YA1, and the folding position. It is attached at a position above the FP. Further, the air nozzles 61b and 61d are mounted (projected) higher than the center (folding position FP) of the package ZA1 than the sealing surface of the top sealer 19b before pressing the film YA1, and are attached to a position below the folding position FP. Be

  This will be described in more detail with reference to FIGS. The air nozzle 61a has a spraying position SP of air to be ejected, which is slightly (for example, about 5 mm) in the thickness direction center (folding position) when the top sealer 19a is in contact with the film YA1 (before pressing). FP), and the air nozzle 61b is slightly blown from the corner seal portion HE1 when the top sealer 19b is in contact with the film YA1 (before pressing) (for example, about 5 mm). The air nozzle 61c has a position close to the center in the thickness direction, and the spray position SP of air to be ejected is slightly (for example, 5 mm) from the corner seal portion HE3 when the top sealer 19a contacts the film YA1 (before pressing). Degree) The air nozzle 61d ejects at a position close to the center in the thickness direction When the top sealer 19a is in contact with the film YA1 (before pressing), the spray position SP is slightly (for example, about 5 mm) closer to the center of the thickness direction than the corner seal portion HE4. It is attached. In FIG. 5B, the bracket 62c and the air nozzle 61c, and the bracket 62d and the air nozzle 61d, which are located on the back side in the illustrated state, are indicated by broken lines.

  Further, as shown in FIGS. 6B and 6C, in the transport direction of the package ZA1, the spray position SP of the air nozzles 61a and 61b on the side S1 side of the film YA1 is the center line C0 of the top seal portion TO1. The spraying positions of the air nozzles 61c and 61d on the side surface S2 side of the film YA1 are approximately equidistant in the front and back across the center position C0 of the top seal portion TO1.

  Thus, air can be blown to the vicinity of the center position of the top seal portion TO1 which is to be formed by hatching in FIG. 4C before the top seal portion TO1 is formed.

  The formation method of top seal part TO1 of this embodiment is further explained using FIG. 6 and FIG. FIG. 6 is a side view corresponding to FIG. 5 (B), and FIG. 7 is a side view corresponding to FIG. 5 (A) and shows a state after the start of air blowing. Also, in both figures, only the main components necessary for explanation are extracted and shown.

  FIG. 6A shows a state in which the top sealers 19a and 19b are in the standby position. In this state, when the film YA1 is conveyed to a predetermined position, the top sealer 19a starts to descend and the top sealer 19b starts to rise. Then, as shown in FIG. 5B, at the timing when they contact the upper surface S3 and the lower surface S4 of the film YA1, the positions of the air nozzles 61a to 61d are shifted from the corner seal portions HE1 to HE4 by about 5 mm toward the folding position FP. Position. The air nozzles 61a to 61d spray air onto the film YA1 at the timing shown in FIG.

  Then, while blowing air from the air nozzles 61a to 61d, the film YA1 is sandwiched and pressed from above and below by the top sealers 19a and 19b as shown in FIG. The air starts to be sprayed at least at the timing shown in FIG. 5B, and continues to blow until the timing shown in FIG. That is, the top sealers 19a and 19b are cylindrical because the corner seal portions HE1 to HE4 are strongly laid down in one direction and creased and fall down to form an acute angle A with respect to the side surface on which the gusset is formed. In the case where the pressing is started by contacting the upper surface S3 and the lower surface S4 of the film YA1, air is blown at least at this timing.

  Then, the side surface of the tubular film YA <b> 1 is pushed in from the outside toward the inside by using air blowing and pushing means such as a gusset claw 72. Here, when the gusset (side surface) is folded, after blowing air, the side surface of the film YA1 is pushed inward from the outside by the pushing means. Also, the blowing of the air and the pressing by the pressing means may be performed simultaneously. Furthermore, the air may be blown temporarily when at least the upper and lower top sealers 19a and 19b contact the upper surface S3 and the lower surface S4 of the cylindrical film, but the openings of the air nozzles 61a to 61d arranged above and below The blowing may be continued until the position of the (air blowing portion) matches in the movement direction. After forming the top seal portion TO1 by sandwiching the film YA1 with the top sealers 19a and 19b, the top sealers 19a and 19b move up and down so as to be separated again, and return to the standby position shown in FIG.

  The state of the film YA1 after the start of the air blowing at the timing of FIG. 6B will be described using FIG. 7.

  As shown to FIG. 7 (A), air is sprayed toward the inner side with respect to side S1, S2 of film YA1 from the outer side. Therefore, even in the case where the corner seal portions HE1 to HE4 are strongly overturned in one direction and have a crease, they are inclined to form an acute angle A with the side surface on which the gusset is formed (FIG. 9, FIG. 10), when the corner seal portions HE1 to HE4 are horizontal, the air pressure causes the vicinity of the corner seal portions HE1 to HE4 on the side of the cylindrical film YA1 as shown in FIG. The film YA1 side surfaces S1 and S2 can be pressed inward. For this reason, it can avoid that film YA1 side surface S1, S2 of the vicinity of the corner seal | sticker parts HE1-HE4 curves outside like the past shown with a broken line.

  Then, in this state, as shown in FIG. 7C, the top sealers 19a and 19b sandwich the film YA1, and at the same time, fold them at the folding position FP at the center of the side (gusseted). In the present embodiment, since the film in the vicinity of the corner seal portions HE1 to HE4 is not curved outward, the top seal is kept in a folded state in which the films in the vicinity of the corner seal portions HE1 to HE4 are folded at the time of top sealing. It can be suppressed and the finish of the package ZA1 can be improved (see FIG. 3B). When the gusset is folded, as shown in FIG. 7 (D), it is desirable to press the side from the outside toward the inside using a pushing means such as the gusset claw 72 or the like.

  Here, the timing (period) of blowing air may be before the formation of the top seal portion TO1, but the timing at which the top sealers 19a and 19b are separated as much as possible is preferable. FIG. 5 and FIG. As shown in FIGS. 7A and 7B, the period from the timing when the top sealers 19a and 19b contact the film YA1 to the time when the top seal portion TO1 is formed is the most desirable. In addition, although the one where the air spraying time is longer is preferable, as shown in FIG.6 (C), the spraying after top seal part TO1 is formed is unnecessary. In the present embodiment, the air nozzles 61a to 61d are arranged so that the top sealers 19a and 19b protrude toward the inner side of the tubular film YA1 from the sealing surface in a state before the film YA1 is pressed (during contact), By moving the air nozzles 61a to 61d up and down according to the top sealers 19a and 19b, the top sealer 19a in which the air ejected from the air nozzles 61a to 61d moves up and down from the timing when the top sealers 19a and 19b contact the film YA1. , 19b can blow air on both side surfaces S1 and S2 of the film YA1 until the timing (FIG. 6C) is interrupted.

  Here, in order to prevent wrinkles of the top seal portion TO1 due to the vicinity of the corner seal portions HE1 to HE4 being curved outward (see FIG. 10C), air is blown to the center C0 of the top seal portion TO1 (air nozzle 61a It is most desirable to arrange the air nozzle 61b, the air nozzle 61c and the air nozzle 61d on the center line C0 of the top seal portion TO1 (see FIG. 5C) However, the air nozzles 61a to 61d are of the top sealers 19a and 19b. Since the air nozzles 61a to 61d are arranged on the center line C0 because they move in the vertical direction as they move up and down, they interfere with each other in the vertical direction when the film YA1 is pressed (see FIG. 5B). In the configuration, the brackets 62a to 62d holding the air nozzles 61a to 61d do not interfere with each other. The air nozzles 61a to 61d are attached to the positions shifted from the center line C0 in the front and rear direction of the package ZA1, whereby the centers of the air nozzles 61a to 61d are shifted from the center line C0 of the top seal portion TO1. There is no problem because air is blown to the periphery including the center of the top seal portion TO1 (FIG. 5C).

  In this embodiment, the air nozzles 61a to 61d are provided at positions slightly closer to the gusset folding position FP than the sealing surfaces of the top sealers 19a and 19b (for example, about 5 mm). The air nozzles 61a to 61d move up and down together with the top sealers 19a and 19b. Thereby, even when the height of the package ZA1 (article XA1) changes, when the top sealers 19a, 19b come into contact with the upper and lower surfaces of the package ZA1, for example, than the seal surfaces of the top sealers 19a, 19b. Air can be blown to a position close to the folding position FP side of the gusset of about 5 mm, and the vicinity of the corner seal portions HE1 to HE4 (corner seal portions HE1 to HE1 without adjusting the blowing positions SP of the air nozzles 61a to 61d. Air can be blown to the folding position FP side by about 5 mm from the HE 4.

  In the above embodiment, the corner seal portions HE1 to HE4 are formed on the film YA1 by the corner seal portion forming means 10, but the present invention is not limited to this, and the corner seal portions HE1 to HE4 are formed in advance. The rolled film YA1 may be used, and in this case, the corner seal portion forming means 10 becomes unnecessary. Even when the roll-shaped film YA1 is used, generation of unnecessary wrinkles can be avoided by blowing air to the vicinity of the top seal portion TO1 before the top seal portion TO1 is formed by the air blowing mechanism 60 of the present embodiment.

  In addition, the corner seal portion HE1 to HE4 may not be formed, for example, may be a package that packages an article having a curved surface such as a cylindrical shape, and also in that case, before the top seal portion TO1 is formed by the air spraying mechanism 60 of the present embodiment. By blowing air to the vicinity of the top seal portion TO1 on the side of the cylindrical film YA1, unnecessary generation of wrinkles can be avoided.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit and the technical idea of the present invention.

  That is, in the above embodiment, the position, size, length, shape, material, orientation, and the like of each component can be changed as appropriate.

  For example, in the above-described embodiment, the configuration in which air is blown to four places, the top and bottom and the left and right (front and rear in the traveling direction) across the center line C0 (see FIG. 5D) of the top seal portion TO1, is shown as an example. As shown in FIG. 8A, the shape of the air nozzle may be a slit that is long in the forward and backward directions including the center line C0 and parallel to the transport surface.

  In this case, in order to avoid interference with the top sealers 19a and 19b, for example, the bracket 62 is attached to driving means separate from the mounting base 70 of the top sealers 19a and 19b, and the top sealers 19a and 19b are moved up and down. Along with this, it is preferable that the top sealers 19a and 19b move outward from both end sides, or the air nozzles 61a to 61d move along the transport direction. In this case, the air nozzles 61a to 61d may be configured to be adjustable in the height direction.

  Further, as shown in FIG. 8B, the air nozzles 61a and 61b and the air nozzles 61c and 61d may be integrally provided, for example, on the brackets 73a and 73b. In this case, the brackets 73a and 73b may be provided with communication holes 74a and 74b which allow the gusset claw 72 to move back and forth, and the folding position FP may be pushed by the gusset claw 72 after the air is blown.

  Further, the pushing means may be a gusset device for ejecting a pressure fluid. The air blown out from the air nozzle is not limited to air at normal temperature, and may be hot air.

1 Corner seal packaging machine (packaging machine)
3 Film supply equipment (supply equipment)
10 Corner seal forming means 14 Bag making machine (bag making device)
16 Center Seal Device 19 Top Seal Device 60 Air Spraying Mechanism 61a, 61b, 61c, 61d Air Nozzle YA1 Film HE1, HE2, HE3, HE4 Corner Seal

Claims (10)

Pushing means for pushing in a predetermined folding position of a part of both side surfaces of the tubular film in the direction of movement from the outside to the inside of the tubular film;
When the top seal portion is formed by folding the tubular film at the folding position and sandwiching the tubular film from above and below in the traveling direction with a top sealer, the top film is closer to the upper and lower surfaces of the tubular film than the folding position. in contrast, it possesses the air nozzle for blowing air from the outside of the tubular film towards the inside,
The cylindrical film is provided with a corner seal at an end of the upper and lower surfaces, and the air nozzle blows air in the vicinity of the corner seal on the side of the cylindrical film.
An air spray mechanism characterized by that. The air nozzle is attached to the top sealer so as to be movable in the vertical direction.
The air blowing mechanism according to claim 1. Pushing means for pushing in a predetermined folding position of a part of both side surfaces of the tubular film in the direction of movement from the outside to the inside of the tubular film;
When the top seal portion is formed by folding the tubular film at the folding position and sandwiching the tubular film from above and below in the traveling direction with a top sealer, the top film is closer to the upper and lower surfaces of the tubular film than the folding position. And an air nozzle for blowing air inward from the outside of the tubular film,
The air nozzle is attached to the top sealer so as to be movable in the vertical direction.
An air spray mechanism characterized by that. The air nozzle blows air when the top sealer contacts the upper and lower surfaces of the cylindrical film.
The air spraying mechanism according to any one of claims 1 to 3, wherein The air nozzle is positioned closer to the center of the cylindrical film than the sealing surface of the top sealer when blowing air.
The air blowing mechanism according to any one of claims 1 to 4, wherein An air blowing mechanism according to any one of claims 1 to 5,
The top seal device which has said top sealer and seals and cuts in the width direction with predetermined intervals to said cylindrical film. A supply device for supplying film;
A corner seal device for forming a corner seal portion on the film supplied from the supply device;
A bag-making apparatus for bending the film in which the corner seal portion is formed in the width direction to form a cylindrical film;
In the downstream of the bag making device, a center seal device for performing a center seal on the tubular film,
An air blowing mechanism according to any one of claims 1 to 5,
And a top sealer that seals and cuts in a width direction at predetermined intervals with respect to the cylindrical film to which the center seal is applied.
Corner seal packaging machine characterized by that. The top sealer and the air blowing mechanism move along the same path,
The corner seal packaging machine according to claim 7. A top seal method in a corner seal packaging machine, wherein a part of both side surfaces in a direction of movement of a cylindrical film is folded by a pressing means at a predetermined folding position and a top seal portion is formed,
Forming a corner seal at the end of the upper and lower surfaces of the tubular film;
Before formation of the top seal portion, to the vicinity of the corner sealing portions of the tubular film side in a position closer to the upper and lower surfaces of the traveling direction of the tubular film than the folded position, the tubular Air is blown from the air nozzle from the outside to the inside of the film,
A top sealing method characterized by the above. A top sealer forming the top seal portion sandwiching the tubular film from above and below in the traveling direction blows air when contacting the upper and lower surfaces of the tubular film.
The top sealing method according to claim 9.

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