JP5246428B2 - Bag making and packaging machine - Google Patents

Description

  The present invention relates to a bag making and packaging machine.

  Conventionally, there is a bag making and packaging machine for manufacturing a square bottom gusset bag. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2006-75987) discloses a vertical bag-making filling and packaging apparatus for making a square bottom bag.

  The gusset bag can be displayed in a self-supporting state, but when a soft packaging material (film) is used, the shape at the time of production may be out of shape before the display at the store. In this case, the independence of the bag is lost.

  The subject of this invention is providing the bag making packaging machine which can improve the independence of the bag made from a bag.

  A bag making and packaging machine according to a first aspect of the present invention is a bag making and packaging machine for producing a packaging bag in which a fold which is a folded portion of a film is formed around a bottom surface. The bag making and packaging machine includes a square cylinder, a lateral seal mechanism, a crease forming member, and a control unit. The square cylinder is arranged inside the square cylindrical film. The lateral seal mechanism laterally seals the rectangular tube-shaped film below the square cylinder to form a lateral seal portion at the approximate center of the bottom surface of the packaging bag. The crease forming member presses against a part of the packaging film around the lower part of the square cylinder from the outside and further moves downward to form a crease around the bottom surface of the packaging bag. The control unit controls the movement of the lateral seal mechanism and the crease forming member.

  Here, the upper and lower portions of the bag are sealed by horizontally sealing the rectangular tube-shaped film. And a crease formation member presses against the packaging film around a square cylinder, and a crease formation member moves below, and a crease is formed in the circumference part of the bottom of a bag. Thereby, the fold of the state which the film overlapped exists around the bottom face of a bag, and the self-supporting property of the manufactured packaging bag increases.

  The bag making and packaging machine according to the first invention may be a new bag making and packaging machine, or the above-described crease forming member is added to an existing packaging machine for producing gusset bags. Also good.

  The bag making and packaging machine according to the second invention is the bag making and packaging machine according to the first invention, wherein the lower part of the square cylinder against which the crease forming member presses through the packaging film is lower than the main body part of the upper square cylinder. It has a shape that goes inside.

  Here, the film along the outer peripheral surface of the main body of the square cylinder is pushed toward (inward) the center of the square cylinder when the crease forming member presses against the lower part of the square cylinder, It will be in the folded state at the bottom. Here, when the crease forming member moves downward, pressure acts on the folded film, and creases are formed around the bottom surface of the bag. Therefore, here, it is not necessary to provide another film folding mechanism for the part of the film to be creased.

  A bag making and packaging machine according to a third aspect of the present invention is the bag making and packaging machine of the first or second aspect of the present invention, further comprising a film transport mechanism that sends a rectangular tube-shaped film downward. And a control part makes a square tube-like film send below by a film conveyance mechanism, when moving a crease formation member below or just before that.

  Here, when the crease forming member moves downward or just before that, the rectangular tube-shaped film is sent downward, so that a large frictional force is generated between the crease forming member and the film and the film may be damaged. It is suppressed. Further, the crease formed around the bottom surface of the packaging bag can have a predetermined appropriate width.

  A bag making and packaging machine according to a fourth invention is the bag making and packaging machine according to any one of the first to third inventions, wherein the crease forming member has a heater and forms a folded fold shape. Heat seal the folded film.

  Here, since the heater is provided in the fold forming member, pressure and heat can be applied from the fold forming member to the folded film that becomes the fold, and the fold is heated without using any other heat generating member. It can be formed by a seal.

  A bag making and packaging machine according to a fifth aspect of the present invention is the bag making and packaging machine according to any one of the first to fourth aspects, further comprising a plate member. The plate member is positioned below the crease forming member when the crease is formed by the crease forming member. And a crease forming member and a plate member form a crease by sandwiching a film that overlaps when the crease is formed.

  Here, since the plate member is provided, the folded film that becomes the fold can be sandwiched from above and below even if the member of the lateral seal mechanism is not located directly below the fold forming member when forming the fold.

  A bag making and packaging machine according to a sixth aspect of the present invention is the bag making and packaging machine of the fifth aspect, wherein the horizontal sealing mechanism has a horizontal sealing member, and the plate member is a movable member. Then, the control unit causes the horizontal seal member and the plate member to enter the space below the square cylinder, and positions the plate member in the space below the square cylinder even after forming the horizontal seal portion by the horizontal seal member of the horizontal seal mechanism (residual). And the crease formation member is formed by pushing down the crease formation member with respect to the plate member.

  Here, since the plate member remains in the lower space of the square cylinder when the pleat forming member is pushed down, even if the horizontal seal member is withdrawn from the lower space of the square cylinder, the fold can be reliably formed. it can.

  A bag making and packaging machine according to a seventh invention is the bag making and packaging machine according to the sixth invention, wherein the control unit moves the plate member after the formation of the horizontal seal portion by the horizontal seal member of the horizontal seal mechanism to move the horizontal seal portion. Defeat.

  Here, even if the horizontal seal portion extends in the vertical direction, the plate member defeats the horizontal seal portion, so the horizontal seal portion is in a posture along the bottom surface of the packaging bag, and the bottom of the bag is more self-supporting. It becomes.

  According to the present invention, there is a fold in a state in which the film overlaps around the bottom surface of the packaged packaging bag, and the self-supporting property of the packaging bag is enhanced.

The schematic perspective view of the principal part of the bag making packaging machine which concerns on one Embodiment of this invention. The front view of the principal part of a bag making packaging machine. The side view of the principal part of a bag making packaging machine. BB sectional drawing of FIG. CC sectional drawing of FIG. The control block diagram of a bag making packaging machine. The front view near an end seal bar and an edge sealer. The side view near an end seal bar and an edge sealer. The top view near an end seal bar and an edge sealer. The 1st top view which shows the operation | movement which forms a bag bottom face. The 1st side view which shows the operation | movement which forms a bag bottom face. The 2nd top view showing operation which forms a bag bottom. The 2nd side view which shows the operation | movement which forms a bag bottom face. The 3rd top view which shows the operation | movement which forms a bag bottom face. The 3rd side view which shows the operation | movement which forms a bag bottom face. The top view of a bag bottom face cooling plate and the bag bottom face mounted on it. The front view of a bag bottom face cooling plate and the bag bottom face mounted on it. The side view of a bag bottom face cooling plate and the bag bottom face mounted on it. (A) 4th side view which shows operation | movement which forms a bag bottom face. (B) The 5th side view which shows the operation | movement which forms a bag bottom face. (A) Front view of square cylinder and corner plate. (B) Side view of square cylinder and corner plate. (C) Top view of a square cylinder and a corner plate. The detailed sectional view of a front and back surface edge sealer. The figure which shows the cooling of the bag bottom face after bag making, and conveyance by a conveyance conveyor. The schematic perspective view of the bag making packaging machine of the conventional gusset bag with a hem. The front view of the bag making packaging machine of the conventional gusset bag with a hem. AA sectional drawing of FIG.

  FIG. 1 shows a bag making and packaging machine according to an embodiment of the present invention. The packaging bag 34 enclosing the products manufactured by the bag making and packaging machine 1 is displayed and displayed at the store. The packaging bag 34 is manufactured so that the bottom surface (bottom portion) is substantially flat so that the packaging bag 34 is self-supporting when displayed and displayed at a store.

<Configuration of bag making and packaging machine>
As shown in FIG. 1, the bag making and packaging machine includes a mechanism for holding and rotating the wound packaging film 8, guide rollers 9 and 10 for transporting the film 14 fed out therefrom, and a sheet-like film 14. Hem is formed in each of the corners of the four corners of the square-shaped film 14 and the center seal bar 15 that vertically seals the overlapping portion of the film 14 that has been formed into a square-shaped cylinder 14 A hem guide 16 and a hem heater 17 for forming, a film feed belt mechanism 23 for feeding the rectangular tube-shaped film 14 downward, and the upper and lower ends of the packaging bag 34 are heat-sealed by horizontally sealing the rectangular tube-shaped film 14 ( Sealing) lateral sealing mechanism 180 (see FIG. 8), side-side triangular guide 24 for forming the bottom surface of the packaging bag 34, bottom folding plates 26, 27 and Edge sealer 28 and 29, and a upper end the bag bottom cooling plate 32 and the pressing plate 30, 31 adjust the bag-shaped cooled the bottom surface of the packaging bag 34 after it is laterally sealed, and the like.

  The packaging bag 34 which is intermittently manufactured by the bag making and packaging machine and becomes a gusseted bag is carried to the next process such as an inspection process by the transport conveyor 35 as shown in FIGS.

(Configuration and operation until transported to former)
The sheet-like film 14 fed out from the wound packaging film 8 is conveyed while being subjected to tension adjustment by being hung on the guide rollers 9 and 10. During the conveyance, the film 14 passes through a registration mark detector 12 for detecting the registration mark 11 and a film meandering detector 13 for detecting the film meandering. Both ends of the film 14 are monitored by the film meandering detector 13 so that both ends are positioned at appropriate positions when the film 14 is formed into a rectangular tube shape by the former 4 or the like.

  The film 14 is a soft packaging material obtained by laminating a combination of several synthetic resin films.

(Detailed configuration of square cylinder and former)
The square cylinder 6 is a rectangular tube-shaped member and is integrated with the upper hopper 3. The hopper 3 is loaded with products such as potato chips that have been weighed to a predetermined amount from a combination weighing device or the like provided above the bag making and packaging machine. The product is introduced into the film 14 having a rectangular tube shape. As shown in FIGS. 7 and 8, the square cylinder 6 includes a main body portion 6a having four surfaces extending in the vertical direction, a lower portion 6c extending in the vertical direction at positions where the four surfaces are closer to the inner side than the main body portion 6a, and both 6a. , 6c are connected to each other by a plane inclined with respect to the vertical plane, and are opened up and down.

  The lower part 6c of the rectangular cylinder 6 having a rectangular cross section smaller than the main body part 6a has a width dimension of the fold 14bb of the bottom face 14b of the bag formed by edge sealers 28 and 29 described later. Only closer to the center side (inner side) than each side in the cross-sectional view of the main body 6a.

  In addition, corner plates 7 are attached to the left and right of the lower portion 6 c of the square cylinder 6. As shown in FIG. 20, the corner plate 7 has a shape corresponding to the outer surfaces of the inclined portion 6 b and the lower portion 6 c of the square cylinder 6. The corner plate 7 includes a corner portion extending outward from orthogonal portions of the four side surfaces of the lower portion 6c of the square cylinder 6, and is a thin plate member made of spring steel. The outer ends of the four corner plate portions are located at the same place as the four vertices of the main body portion 6a in plan view.

  The former 4 is arranged so as to surround the upper part of the main body 6 a of the square cylinder 6. The form of the former 4 is such that when the sheet-like film 14 that has been sent passes between the former 4 and the square cylinder 6, it is formed into a rectangular tube shape.

(Detailed configuration of center seal bar)
The center seal bar 15 heats the overlapping portion of the film 14 wound on the square cylinder 6 (the overlapping portion on both sides of the film 14) while sandwiching it from the left and right with a constant pressure, and vertically seals it. (See FIG. 4 and FIGS. 7 to 10). A portion that is vertically sealed by the center seal bar 15 becomes a vertical seal portion 14a (see FIG. 7).

(Detailed configuration of film feed belt mechanism)
The film feed belt mechanism 23 disposed on the back side of the square cylinder 6 is provided for sucking and transporting the film 14 wound around the square cylinder 6 downward, and has a drive roller, a driven roller, and a suction function. It is composed of an endless belt. In the bag making and packaging machine according to this embodiment, since the bag making is performed in a batch manner, the rectangular tube-shaped film 14 is also intermittently conveyed by the film feeding belt mechanism 23. The drive roller is driven by a servo motor, and the feed accuracy is good.

(Detailed configuration of hem guide and hem heater)
As shown in FIG. 4, hem heaters 17 are provided in the vicinity of the corners at the four corners of the main body 6 a of the corner cylinder 6. As shown in FIGS. 1 to 3, the height positions of the four hem heaters 17 substantially coincide with the center seal bar 15.

  A hem guide 16 shown in FIGS. 1 and 2 is disposed above the hem heater 17. When the corner 14 is guided to the hem guide 16 and descends to a certain height position of the hem heater 17 as shown in FIG. In this case, the shape is folded. These folded portions are heat-sealed by the hem heaters 17 to form hems 14c (see FIG. 5). Heat sealing by the hem heater 17 is performed when the film feeding belt mechanism 23 is temporarily stopped.

(Detailed configuration of horizontal seal mechanism)
A horizontal sealing mechanism 180 having a pair of end seal bars 18 disposed on both the left and right sides of the square cylinder 6 sandwiches the film 14 as shown in FIG. Thus, the pair of end seal bars 18 are pressed against each other. As shown in FIG. 3, one pair of the end seal bars 18 is disposed below the center seal bar 15, and the other is disposed below the film feed belt mechanism 23.

  A cutter 19 is incorporated in one end seal bar 18. The cutter 19 cuts the center of the horizontal seal portion of the film 14 and cuts the horizontal seal portion up and down (see FIG. 13).

(Detailed configuration of each member for forming the bottom surface of the packaging bag 34)
The side-side triangular guide 24 is a member that presses against the film 14 from the left and right so that a bottom surface can be formed on the rectangular tube-shaped film 14. As shown in FIG. 1, the side triangular guide 24 is integrated with a bag upper folding plate 25 disposed below, and presses against the film 14 when the end seal bar 18 performs heat sealing. Perform gusset folding operation. The side triangular guide 24 includes a cooling unit 24a (see FIG. 7) that blows out cooling air.

  The two-stage bottom folding plate 26 and the front bottom folding plate 27 are disposed slightly above the end seal bar 18, and after the end seal bar 18 performs heat sealing, the cutter 19 cuts the horizontal seal portion up and down. When it is, it enters the gap (the gap in the height direction) between the bottom surface 14b of the film 14 and the end seal bar 18 (see FIG. 19A). At this time, the bottom folding plates 26 and 27 are heated by absorbing the residual heat of the end seal bar 18. As shown in FIG. 3, the two-stage bottom folding plate 26 is disposed below the film feed belt mechanism 23, and the front bottom folding plate 27 is disposed below the center seal bar 15. The bottom folding plates 26 and 27 are provided with cooling portions 26a and 27a (see FIG. 8) for blowing out cooling air.

  The pair of front and rear surface edge sealers 28 and the pair of left and right surface edge sealers 29 are disposed so as to face the four side surfaces of the lower portion 6c of the square cylinder 6, as shown in FIGS. . Since the edge sealers 28 and 29 have substantially the same configuration, the configuration will be described using the front and rear surface edge sealers 28 as an example. As shown in FIG. 21, the front and rear surface edge sealer 28 mainly includes a heater block 28a, a film contact plate 28b, a cartridge heater 28c, a heat pipe 28d, and a temperature sensor 28e as main bodies. A film contact plate 28b made of spring steel is mounted on the outer surface of the heater block 28a and hits the film 14. The presence of the film contact plate 28b prevents the film 14 from directly touching the heater block 28a.

  These edge sealers 28 and 29 are configured to be moved in a rectangular shape by a drive mechanism (not shown). As will be described later, the edge sealers 28 and 29 are pressed against the lower part 6c of the square cylinder 6 from the top of the film 14 and thereafter moved downward. Thus, the folded portion of the film 14 is sandwiched between the two-stage bottom folding plate 26 to form a fold (heat seal the fold).

(Configuration to shape the bag that is cut from the following film with a cutter)
As shown in FIGS. 1, 7, 8, and 22, the bag bottom surface cooling plate 32 can move directly below the bag 34 that is laterally sealed at the top. As shown in FIGS. 17 and 18, the bag bottom surface cooling plate 32 arranged in this way has a large number of air blowing holes 321a formed on the top surface, and an air intake member for sending air to the internal space 321b. External high-pressure air or the like is taken in from 322, and cooling air is blown out from the air blowing hole 321a toward the bottom surface 14b of the upper bag 34. The bag bottom surface cooling plate 32 enters below the bag 34 before the end seal bar 18 heat-seals the film 14 sideways (side-seal), and air flows when the end seal bar 18 side-seal the film 14. Cooling air is blown out from the blowout holes 321a, and the cutter 19 is detached from the lower space of the bag 34 when the center of the lateral seal portion of the film 14 is cut. The bag bottom surface cooling plate 32 plays a role of removing residual heat remaining on the bottom surface 14b including the folds 14bb of the bag 34 and finishing the bottom surface 14b cleanly.

  A pair of bag right and left surface pressing plates 30 and a pair of bag front and rear surface pressing plates 31 are a plate group that presses the bag 34 in a state in which the bag bottom surface cooling plate 32 enters downward from the front, rear, left and right surfaces. These holding plates 30 and 31 are formed on the four side surfaces of the bag 34 when the end seal bar 18 heat-seals the film 14 sideways and the bag bottom surface cooling plate 32 blows cooling air to the bottom surface 14b of the bag 34. The bag 34 is pressed by contact. Further, the presser plates 30 and 31 are separated from the bag 34 when the horizontal seal is finished and the cutter 19 cuts the center of the horizontal seal portion of the film 14. By these presser plates 30 and 31, the four surfaces of the body portion of the bag 34 are finished in the intended shape.

<Main operations of bag making and packaging machine>
Next, the main operation of the bag making and packaging machine will be described with reference to FIGS. 5, 7 to 15, 19, and 22, in a manner that summarizes the movements of the above-described parts. Each operation is performed by a command from the controller 50 shown in FIG.

  When the film feed belt mechanism 23 is temporarily stopped, the hem heater 17 is activated to form a hem by heat sealing, and the side face side triangular guide 24 and the bag upper folding plate 25 move inward. Then, the gusset folding operation is performed. Further, the vertical seal portion 14a is formed by the center seal bar 15 (vertical seal) and the horizontal seal portion is formed by the end seal bar 18 (horizontal seal). By the formation of the lateral seal portion, the upper portion of the product-filled packaging bag 34 and the central portion of the subsequent bottom surface (bottom portion) 14b of the packaging bag 34 are formed simultaneously. Thereafter, the center of the horizontal seal portion is cut, and the horizontal seal portion is divided into an upper portion of the packaging bag 34 and a central portion of the bottom surface (bottom portion) 14b of the packaging bag 34 that follows. As a result, the bag 34 that has been packaged and separated from the upper bag is landed on the transport conveyor 35 as shown in FIG.

  In addition, at the timing of forming the horizontal seal portion or cutting the horizontal seal portion by the cutter, the bag 34 positioned below the horizontal seal mechanism is used by the bag bottom surface cooling plate 32 and the holding plates 30, 31 as shown in FIG. Although the shape adjusting operation is performed, since this operation has already been described above, the description thereof is omitted.

  Further, the film 14 detects the registration mark 11 printed in advance on the packaging film 14 with the registration mark detector 12 and intermittently feeds it for a predetermined length so that the horizontal sealing is performed at a predetermined position. It has become. In addition, the film meandering detector 13 detects the positions of both ends of the film 14 and feeds the film 14 while adjusting the feed angle of the film feed belt mechanism 23 so that no deviation occurs during vertical sealing by the center seal bar 15. So, meandering is eliminated.

  In view of the formation of the crease according to the present invention, the film feed belt mechanism 23 does not intermittently feed the length of the packaging bag 34 at a time, but in two stages, the length of the packaging bag 34. The film is fed. This will be described below with the movement of the edge sealers 28 and 29, the bottom folding plates 26 and 27, the end seal bar 18, and the like.

  Before the side seal operation by the end seal bar 18 is started, as shown in FIGS. 5, 7 and 8, the edge sealers 28 and 29, the bottom folding plates 26 and 27, the end seal bar 18, the side triangular guide 24 and The bag upper folding plate 25 stands by at a position away from the rectangular tube-shaped film 14 that hangs vertically.

  When the lateral sealing operation by the end seal bar 18 is started, as shown in FIGS. 9 to 11, a portion where the end seal bar 18 becomes the lateral seal portion of the film 14 is sandwiched from the left and right, and heat and pressure are applied to the overlapping portion of the film 14. Add At this time, the edge sealers 28 and 29 are still in a standby position away from the film 14 as shown in the left half of FIG. On the other hand, as described above, at the time of horizontal sealing, the side triangular guide 24 and the bag upper folding plate 25 perform a gusset folding operation, and the center seal bar 15 performs a vertical sealing operation (the black arrows in FIGS. 10 and 11). See). Further, during the lateral sealing operation, the film feeding belt mechanism 23 performs secondary feeding (about several millimeters) of the film 14. This secondary feeding is an operation performed for the next edge seal (crease formation) operation. The film 14 is slightly slackened, and the film 14 above the laterally sealed portion is moved to the bottom surface 14b (FIG. 19 ( The purpose is to be folded around A). In FIG. 19A, this horizontal sealing operation is indicated as “operation 1”.

  When the lateral sealing operation by the end seal bar 18 is finished, as shown in the right half of FIGS. 12, 13 and 19A, the cutter 19 cuts the center of the lateral sealing portion, and the bottom folding plates 26 and 27 are moved. It moves inward and covers the upper portion of the end seal bar 18, and the edge sealers 28 and 29 press against the inclined portion 6b and the lower portion 6c of the square cylinder 6 from above the film 14 (the white arrow 1B in FIG. 19A). reference). The two-stage bottom folding plate 26 moves in two stages. Here, the second-stage folding plate 26 moves to the vicinity of the center of the square cylinder 6 by performing the first stage movement.

  Next, as shown in the left half of FIGS. 14, 15, and 19 (B), the pair of end seal bars 18 are slightly retracted away from each other, the cutter 19 is retracted, and the side-side triangular guide 24 and The bag upper folding plate 25 is retracted and the center seal bar 15 is opened. Further, the two-stage bottom folding plate 26 moves (advances) the second bullet, and conversely the front bottom folding plate 27 moves backward (see FIG. 19B). At this time, the upper part of the horizontal seal portion cut by the cutter 19 (the horizontal seal portion 14ba in FIG. 19B) is brought down by the two-stage bottom folding plate 26 and stuck to the bottom surface 14b of the bag. Become one. The operation so far is displayed as “operation 2” in FIG. Then, the four edge sealers 28 and 29 are lowered downward and press against the two-stage bottom folding plate 26 and the end seal bar 18 therebelow. At this time, the film 14 that is folded up and down around the lower portion 6c of the square cylinder 6 is sandwiched between the edge sealers 28 and 29 and the two-stage bottom folding plate 26, receives pressure, and also has an edge. Heat is transmitted from the sealers 28 and 29, the two-stage bottom folding plate 26 and the end seal bar 18, and heat sealing is performed to form folds (see the white arrow 2c in FIG. 19B). In these series of operations, below the lateral seal mechanism 180, the bag bottom surface cooling plate 32 and the holding plates 30 and 31 finish the shape of the bottom surface 14 b and the body portion of the bag 34, and then retreat from the bag 34. .

  When heat sealing by the edge sealers 28 and 29 is completed and a crease is formed around the bottom surface 14b, each member returns to the position shown in FIGS. 5, 7, and 8, and a series of cycles is completed. Thereafter, the film feeding belt mechanism 23 performs the primary feeding of the film 14 again. In the primary feed, the film 14 is fed downward by a distance obtained by subtracting the length of the bag by the length of the secondary feed.

<Main features of bag making and packaging machine>
A conventional bag making and packaging machine has a structure as shown in FIGS. Since it consists of a member with a function similar to the bag making packaging machine of embodiment of the above-mentioned this invention, the code | symbol similar to the said embodiment is attached | subjected about the similar member.

  The film feed belt mechanisms 21 and 22 are provided on the left and right sides of the square cylinder 6 in a front view. There are a method of continuously sending the film 14 at a high speed, a method of sending the film 14 intermittently, or a method capable of performing gusset type packaging by adding or exchanging parts to this. In order to make the packaging bag 33 of the gusset type with a hem into a well-formed shape, film feeding and processing accuracy of each part of the square cylinder 6 to which hem is applied after the packaging film is formed into a rectangular tube shape are important. For this reason, for film feeding, the left and right film feeding belt mechanisms 21, 22 simultaneously drive the suction type feeding belt using a vacuum pump by the servo motor.

  Moreover, the film feed belt mechanisms 21 and 22 may exist, and the hem heater 17 is positioned above (see FIGS. 23 and 24).

  In the conventional bag making and packaging machine shown in FIGS. 23 to 25, the side-side triangular guide 24 and the bag upper folding plate 25 that perform the gusset folding operation exist, but a fold is formed around the bottom surface of the bag 33. The member does not exist.

  In contrast to such a conventional bag making and packaging machine, the bag making and packaging machine according to the above-described embodiment of the present invention has the following characteristics (1) to (6).

(1)
The bag making and packaging machine according to the present embodiment is a bag making and packaging machine for producing a packaging bag in which a fold 14bb (see FIG. 16) that is a folded portion of the film 14 is formed around the bottom surface 14b. In this bag making and packaging machine, as shown in FIG. 13, the edge sealers 28 and 29 which are crease forming members press against a part of the film 14 around the lower part 6c of the square cylinder 6 from the outside, As shown in FIG. 15, by moving further downward, a fold 14bb is formed around the bottom surface 14b of the packaging bag. Thereby, the fold 14bb in a state where the film 14 overlaps and is heat-sealed exists around the bottom surface 14b of the bag 34, and the self-supporting property of the manufactured packaging bag 34 is increased.

(2)
In order to simplify the configuration for forming the crease (1) described above, in this bag making and packaging machine, the cross-sectional shape of the lower portion 6c of the square cylinder 6 with which the edge sealers 28 and 29 are pressed through the film 14 is It is assumed that it has entered inside the main body 6a above it. Thereby, the film 14 along the outer peripheral surface of the main body portion 6a of the square cylinder 6 is pressed toward the center of the square cylinder 6 (inward) by the edge sealers 28 and 29 pressing against the lower portion 6c of the square cylinder 6. ) And is folded under the edge sealers 28 and 29. Here, when the edge sealers 28 and 29 are moved downward, pressure and heat act on the folded film 14 so that the folds 14bb are reliably formed around the bottom surface 14b of the bag 34. ing.

(3)
In the crease formation (1) described above, this bag making and packaging machine is provided with a film feed belt mechanism 23 for feeding the rectangular tube-shaped film 14 downward so that the film 14 can be folded back reliably. The film 14 is fed downward by the width of the fold 14bb by secondary feeding immediately before the folds 28, 29 are lowered and the crease is formed. Accordingly, the fold 14bb formed around the bottom surface 14b of the packaging bag 34 has a predetermined appropriate width without sliding the edge sealers 28, 29 and the film 14.

(4)
In this bag making and packaging machine, since the edge sealers 28 and 29 are provided with the cartridge heater 28c, the folded film 14 is heat-sealed to form a fold 14bb. For this reason, the fold 14bb receives heat not only from the lower two-stage bottom folding plate 26 and the end seal bar 18 but also from the upper edge sealers 28 and 29, and is well heat-sealed.

(5)
Further, in this bag making and packaging machine, before the formation of the fold 14bb, the two-stage bottom folding plate 26 enters under the edge sealers 28 and 29, and the horizontal seal portion 14ba is brought down from the vertical state to the horizontal state. As a result, the bottom surface 14b approaches a flat state, and the two-stage bottom folding plate 26 that has absorbed some of the heat of the end seal bar 18 plays a role of attaching the lateral seal portion 14ba to the bottom surface 14b. In the above embodiment, the end seal bar 18 exists in the space below the edge sealers 28 and 29 when the folds are formed. However, even when the end seal bar 18 is retracted from the space below, the two-stage bottom folding is performed. Since the plate 26 is present, crease formation is possible.

  Note that the direction in which the horizontal seal portion 14ba is tilted by the two-stage bottom folding plate 26 is the back sticking side, that is, the vertical seal portion 14a side formed by the center seal bar 15, as is apparent from FIGS. . As a result, even if the bag 34 collapses due to a loss of balance when it is displayed at the storefront, the bag 34 usually falls in a form in which the back sticking side is the lower surface. For this reason, even when the bag 34 that has been self-supported falls down at the storefront, the so-called surface is raised, and appeal to customers of the store is maintained.

(6)
In the vertical packaging machine of this embodiment, the film feed belt mechanism 23 is arranged on the back side of the square cylinder 6. As shown in FIG. 1, a hem heater 17 is provided at the same height position as the center seal bar 15 and the film feed belt mechanism 23. For this reason, as apparent from a comparison between FIG. 1 and FIG. 23, the height of the bag making and packaging machine is kept relatively low. That is, a pair of film feed belt mechanisms 21 and 22 (refer to FIG. 23) which are conventionally positioned on the left and right sides of the square cylinder 6 are arranged on the back side facing the center seal bar 15 with the square cylinder 6 interposed therebetween. Since it changed to the structure (refer FIG. 1) in which 23 is located, the height dimension of a bag making packaging machine is small.

<Modification>
(A)
In the above embodiment, after the horizontal seal portion 14ba is tilted by the two-stage bottom folding plate 26, the edge sealers 28 and 29 are lowered without moving the end seal bars 18 in a state of being slightly separated from each other, thereby forming folds. However, it is also conceivable to return the pair of end seal bars 18 to each other during crease formation. In this case, the phenomenon that the two-stage bottom folding plate 26 and the end seal bar 18 are bent slightly downward by the lowering of the edge sealers 28 and 29 is suppressed, and the rigidity of these (two-stage bottom folding plate 26 and end seal bar 18) is reduced. Even when it is small, it is possible to form folds with a strong pressure.

  However, in the above embodiment, the operation of this modification is not performed because the pair of end seal bars 18 has sufficient rigidity even if they are slightly apart from each other.

(B)
In the above embodiment, the hem guide 16 and the hem heater 17 are provided in the bag making and packaging machine. However, the present invention in which the fold 14bb is formed around the bottom surface 14b of the bag 34 by the edge sealers 28 and 29 is a hem forming function. The present invention can also be applied to a bag making and packaging machine that does not have a bag.

  The present invention can also be applied to a bag making and packaging machine that does not have the hem heater 17 but can reliably crease the four corners of the film 14.

(C)
Although not clearly shown in the above embodiment, the two-stage bottom folding plate 26, the front bottom folding plate 27, the pair of front and rear edge sealers 28, and the pair of left and right edge sealers 29, which are characteristic structures, are packaged and packaged from the beginning. It may be installed in a machine, or may be added to an existing bag making and packaging machine (for example, a conventional bag making and packaging machine for a conventional gusset bag as shown in FIG. 23).

(D)
In the above embodiment, the secondary feed of the film 14 is performed immediately before the edge sealers 28 and 29 are moved downward. However, the secondary feed of the film 14 is sent simultaneously with the movement of the edge sealers 28 and 29 downward. It is good also as a control.

6 square cylinder 6a square cylinder body 6c square cylinder bottom 14 film 14b bag bottom 14ba bag bottom seal 14bb bag bottom fold 18 end seal bar (horizontal seal member)
23 Film feed belt mechanism (film transport mechanism)
24 Side-side triangular guide 25 Bag upper folding plate 26 Double bottom folding plate (plate member)
28 Front and rear edge sealers (crease forming members)
28c Cartridge heater (heater)
29 Left and right edge sealers (crease forming members)
34 Packaging bags 50 Controller (control unit)
180 Horizontal seal mechanism

JP 2006-75987 A

Claims (7)

A bag making and packaging machine for manufacturing a packaging bag in which a fold (14bb) that is a folded portion of a film (14) is formed around a bottom surface (14b),
A square cylinder (6) disposed inside the rectangular tube-shaped film;
A horizontal seal mechanism (180) that horizontally seals the rectangular tube-shaped film below the square cylinder to form a horizontal seal portion (14ba) at the approximate center of the bottom surface of the packaging bag;
Forming the crease around the bottom of the packaging bag by pressing against the part of the packaging film around the lower part (6c) of the square cylinder from the outside and moving downward Members (28, 29);
A control unit (50) for controlling movement of the lateral seal mechanism and the crease forming member;
A bag making and packaging machine. The lower part (6c) of the square cylinder (6) against which the crease forming members (28, 29) are pressed through the packaging film (14) is located inside the main body part (6a) of the angular cylinder above it. It has an intrusive shape,
The bag making and packaging machine according to claim 1. Film transport mechanism (23) for feeding the rectangular tube-shaped film (14) downward
Further comprising
The controller (50) causes the square tube-like film to be sent downward by the film transport mechanism when the crease forming member (28, 29) is moved downward or immediately before the fold forming member (28, 29).
The bag making and packaging machine according to claim 1 or 2. The fold forming member (28, 29) has a heater (28c), forms a folded shape of the fold (14bb), and heat seals the folded film of the fold.
The bag making and packaging machine according to any one of claims 1 to 3. A plate member (26) located below the crease forming member when the crease (14bb) is formed by the crease forming member (28, 29).
Further comprising
The crease forming member and the plate member form the crease by sandwiching the folded film when forming the crease,
The bag making and packaging machine according to any one of claims 1 to 4. The lateral seal mechanism (180) has a lateral seal member (18),
The plate member (26) is a movable member,
The controller (50) causes the horizontal seal member and the plate member to enter the space below the rectangular cylinder (6), and after the horizontal seal portion (14ba) is formed by the horizontal seal member of the horizontal seal mechanism. Also, the plate member is positioned in the lower space of the square cylinder, and the crease (14bb) is formed by pushing down the crease forming member (28, 29) against the plate member.
The bag making and packaging machine according to claim 5. The control unit (50) moves the plate member (26) and tilts the horizontal seal part after the horizontal seal part (14ba) is formed by the horizontal seal member (18) of the horizontal seal mechanism.
The bag making and packaging machine according to claim 6.

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