JP5635542B2 - Bag opening part forming device in bag making and filling machine - Google Patents

Description

  The present invention relates to a bag opening portion forming apparatus in a bag making and filling machine.

  Patent Documents 1 and 2 propose a package that can be opened in a wide open state by a horizontal bag making and filling machine. These polymerize the strip films drawn from the upper and lower two supply sources, send articles to the polymerized film at predetermined intervals, and perform vertical sealing at the left and right overlapping portions of the strip films, The package is obtained by performing horizontal sealing and cutting at the front and rear positions sandwiching the supplied article.

Japanese Utility Model Publication No. 1-128503 Japanese Utility Model Publication No. 54-165263

  In the above-described packaging device, there are problems such that the overlapping positions of the overlapping positions of the upper and lower films are difficult because the overlapping positions of the left and right ends of the films are shifted due to the meandering of the films. If the finished state of the unsealed portion in the package obtained in this way becomes non-uniform, the commercial value is impaired.

  That is, the present invention has been proposed to solve these problems in view of the above-mentioned problems inherent in the prior art, and in order to obtain a package that can be opened in a wide opening state, the finished state of the opening portion is improved. It aims at providing the bag opening part formation apparatus in the bag making filling machine which can be performed.

In order to overcome the above-mentioned problems and achieve the intended purpose, a bag opening portion forming apparatus in a bag making and filling machine according to claim 1 of the present application is:
A belt-shaped film drawn from a film supply source is formed into a cylindrical shape by bag-making means through a required conveyance path, and an article is supplied into the cylindrical film and a predetermined seal is applied to the cylindrical film to form a package. In the bag making and filling machine to obtain,
In the conveying path, both sides of the cylindrical film formed from the belt-like film are folded inward and folded, and the overlapping surface of the folded edge is folded from the outside of the folded edge that is folded at the outer edge of the flat film A cutting means for inserting a cutting blade between them to form a continuous cut; and
And an edge sealing means that is spaced downstream of the cutting means in the film conveyance direction and heats the bent edge portion to form an edge seal portion having a predetermined width continuous in the film conveyance direction. .
According to the first aspect of the present invention, the cutting edge is inserted into the bent edge portion that is folded at the outer edge of the film so that the cut is formed. Not likely to occur. That is, in obtaining a package that can be separated and opened from the other film by pulling one film between the two edge seal portions, the finished state of the opening portion can be satisfactorily achieved. In addition, since a package can be obtained from one film, in anticipation of the polymerization deviation in the width direction of the two films, compared with the conventional method in which the edge portion where the film is polymerized and sealed is cut off, Packaging that is environmentally friendly, such as reducing film usage per package, because there is no need to use a film with sufficient width for the cutting allowance, without generating film chips. Can be done.

The invention according to claim 2 is characterized in that the cutting blades can be adjusted in position independently of each other with respect to the film transport center, and the interval between the cutting blades can be adjusted.
According to the invention which concerns on Claim 2, while being able to adjust a position according to the goods from which a width dimension differs, it can respond also to the position shift by the meandering of a film.

According to a third aspect of the present invention, the apparatus includes a pair of auxiliary feeding rollers that sandwich and send a film that is folded in a flat shape in the conveyance path between the formation of the bent edge portion and the edge sealing means. The cutting means is arranged in the vicinity of the downstream side of the auxiliary feeding roller.
According to the invention which concerns on Claim 3, while conveying a film reliably, the cutting position of the film by a cutting blade can be stabilized more.

According to a fourth aspect of the invention, the edge seal means is spaced downstream in the film transport direction, and the edge seal portion formed by the edge seal means is partially reheated and welded to obtain an unsealed tear stopper. The sealing means is provided.
According to the invention which concerns on Claim 4, since the edge seal | sticker part top is hold | suppressed and sealed with a reinforcement sealing means, it does not affect the appearance of a package.

In the invention according to claim 5, the reinforcing seal means comprises a rotary sealer that is rotationally operated at a timing in accordance with the conveyance of the film for one wrapping length. And a pair of sealing bodies that can be sandwiched and reheated.
According to the invention which concerns on Claim 5, while changing the timing at which a seal body clamps a film with respect to several packaging varieties from which length can be formed during continuous conveyance of a film, and different length It can respond easily.

  According to the bag opening portion forming apparatus in the bag making and filling machine according to the present invention, the finished state of the opening portion can be satisfactorily obtained in obtaining a package that can be opened in a wide opening state.

It is a schematic explanatory drawing which shows the packaging apparatus which concerns on the suitable Example of this invention. (a) is a schematic sectional drawing which shows the state fractured | ruptured by the X1-X1 line | wire of FIG. 1, (b) is a schematic sectional drawing which shows the state fractured | ruptured by the X2-X2 line | wire of FIG. It is a schematic sectional drawing which shows the state fractured | ruptured by the X3-X3 line | wire of FIG. It is the schematic which shows the shaping | molding guide and guide member of an Example, (a) is a top view, (b) is a side view, (c) is the Y1-Y1 sectional view taken on the line of (b). (D) is the Y2-Y2 sectional view taken on the line of (b). It is a schematic plan view which omits a crimping | compression-bonding means in the bag opening part formation apparatus of an Example. It is a general | schematic longitudinal side view which shows the reinforcement sealing means of an Example. (a) is a schematic perspective view which shows the package obtained with the packaging apparatus of the Example, (b) is the ZZ sectional view taken on the line of (a).

  Next, a bag opening part forming apparatus in a bag making and filling machine according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment.

  First, the package 10 obtained by the apparatus according to the embodiment will be described. As shown in FIG. 6, the package 10 of the example has a vertical seal 11 formed by applying a vertical seal to the polymerization edge of the film F, and a horizontal seal at the front and back positions of the film F sandwiching the article G. In a substantially rectangular tube shape having a pair of lateral seal portions 12, 12 formed and a pair of edge seal portions 14, 14 extending so as to intersect (orthogonal in the embodiment) the lateral seal portion 12. It is a bag-packed product obtained by the formed bag making and filling machine. The package 10 is formed with edge seal portions 14 on the left and right edge portions on the front surface side opposite to the back surface where the vertical seal portion 11 is located, and the center portion of each side surface between the back surface and the front surface is folded inward. A gusset is formed. Each edge seal portion 14 is sealed in a state where two films F, F are overlapped, and is formed in a bowl shape extending outward from the side surface. In addition, the package 10 is formed with an unsealed portion 16 that is connected to the outside of one horizontal seal portion 12 and is not sealed with the exception of the vertical seal portion 11 and the edge seal portion 14. Then, the package 10 picks up the unsealed portion 16 and separates the front side film F sandwiched between the two edge seal portions 14 and 14 from the back side film F, whereby one side seal portion 12 and two The edge seal portions 14 and 14 can be separated from each other, and can be separated into a front side film F and an article storage side film F which is a flanged container and can be opened. Here, the packaging body 10 is located in the middle of the edge seal portion 14, and when the cover-side film F is separated between the two edge seal portions 14, 14, the separation of the film F is regulated in the middle. An unsealing tear stopper 18 is formed. The package 10 has a peel resistance enough to be peeled off by hand corresponding to at least a portion where the edge seal portion 14 is formed and a position where the one side seal portion 12 which is the opening start end side is formed. A heat-weldable plastic film with strong stiffness, such as an aluminum vapor-deposited film or a Japanese paper laminate film, in which the film F made of a process or material that can be used is used, and the shape retention can be improved by forming the edge seal portion 14 and the folding line. Is preferably adopted.

  In the following description of the apparatus, upstream and downstream are designated with reference to the transport direction of the film F. As shown in FIG. 1, in the packaging device, the belt-like film F drawn from the film supply source 20 is formed into a cylindrical shape by the forming means 22. The forming means 22 includes a tube forming guide 24 for guiding both side edges of the belt-like film F so as to overlap each other on the upper side, and a cylindrical forming guide 26 inserted inside the tube forming guide 24. A cylindrically formed film F passes between the guide 24 and the forming guide 26. As shown in FIG. 3, the forming guide 26 for guiding the inner periphery of the tubular film F has a circular cross-sectional shape in which the upstream end side is orthogonal to the film conveying direction and a cross-sectional outer shape on the downstream end side. Are formed in a trapezoid in which opposite sides parallel to each other are arranged. Here, the shape of the forming guide 26 is gradually changed to a trapezoidal shape from the middle part toward the downstream side, and as shown in FIG. It becomes a trapezoid which is longer than the upper side on the overlapping edge side. Then, the film F which is guided and formed by the forming means 22 has a cylindrical shape on the upstream side and is deformed into a trapezoidal shape on the downstream side. The cylindrically formed film F is folded inwardly from the left and right outer sides by the folding means 28 arranged on the downstream side of the molding means 22 and is folded inward by the folding. It can be folded over.

  As shown in FIG. 2 (a), the folding means 28 includes a pair of guide members 30, 31 for guiding the tubular film F from the inside, and the tubular film F between the guide members 30, 31 on the inside. And a pair of folding guides 32 and 32 for bending and guiding toward each other. As shown in FIG. 3, both guide members 30, 31 are arranged so as to extend from opposite parallel sides at the downstream end of the forming guide 26, and are connected to the downstream side of the narrow upper side to overlap the film F. The narrow guide member 30 arranged on the edge side is set to the same width dimension as the upper side, and the wide guide member 31 connected to the downstream side of the wide lower side is set to the same width dimension as the lower side. Both the guide members 30 and 31 are formed so as to approach each other from the upstream edge toward the downstream side, and the wide guide member 31 extends further downstream in the film transport direction than the narrow guide member 30. Both folding guides 32 and 32 are formed of a disc-like plate material that can freely rotate, and a substantially central portion in the thickness direction of the tubular film F is bent and guided inward by the folding guides 32 and 32. And by conveying the cylindrical film F in the state which applied the tension | tensile_strength, the folding end of the bending edge part Fb guide | folded and guided by the side edge of the wide guide member 31 in the film F, and the narrow guide member 30 The bent end of the bent edge portion Fc on the article storage side that is guided to be bent at the side edge approaches, and the bent end of the bent edge portion Fb is outward from the bent end of the bent edge portion Fc by the seal margin Ft. It is folded up in the state extended to. As shown in FIG. 1, a pressing roller 33 that presses the overlapping edge portion of the tubular film F is disposed so as to be freely rotatable at a portion facing the forming guide 26 and the narrow guide member 30.

  The folding guides 32 and 32 are configured such that the positions of the folding guides 32 and 32 can be adjusted independently of each other with respect to the transport center of the film F, and the distance between them can be adjusted. That is, by adjusting the folding guides 32, different bag widths of the package 10 can be accommodated.

  The film F folded flatly after passing through the folding means 28 is provided with fold lines at the inner folded portion Fa, the folded edge of the folded edge portion Fb, and the folded end of the bent edge portion Fc. As shown in FIG. 1, the film F folded flat is sandwiched between a pair of auxiliary feeding rollers 34, 34 disposed on the downstream side of the folding means 28 and conveyed toward the downstream bag making means 52. In addition, the paper is fed with the conveying direction opposite to the horizontal drawing direction from the film supply source 20. Both auxiliary feeding rollers 34 and 34 can be transported in a state where tension is applied to the film F by receiving a driving force of a motor or the like.

  As shown in FIG. 1, a cutting means 36 is disposed in the vicinity of the downstream side of the auxiliary feeding rollers 34, 34. The cutting means 36 forms a cut immediately after being fed from the auxiliary feeding rollers 34 and 34 at the bent edges Fb and Fb of the film F folded flat. As shown in FIG. 4, the cutting means 36 is composed of a pair of knives 38, 38 disposed with the blade edges facing inward from the left and right sides of the film F to be conveyed. The cutting blade 38a is used to form a cut so as to divide the two films F, F that overlap at the bent edge Fb.

  As shown in FIG. 4, the cutting edges 38a of the knives 38 obliquely intersect the line where the side edges of the film F extend downstream, and the mutual distance between the cutting edges 38a, 38a toward the downstream side increases. Thus, they are arranged in a substantially “C” shape in plan view. The cutting blade 38a is inserted between the overlapping surfaces of the bent edge portion Fb from the outside of the bent edge portion Fb that is folded at the outer edge of the flat film F. Further, the pair of knives 38 and 38 are configured such that their positions can be adjusted independently of each other with respect to the transport center of the film F and the distance between them can be adjusted. That is, each knife 38 is positioned with respect to the bent edges Fb and Fb spaced in the width direction of the film F that is folded and conveyed corresponding to different bag widths by adjusting the interval between the cutting blades 38a. It has come to be able to do. Thereby, it can respond to the shift | offset | difference of the conveyance position of the film F, and the change of packaging size. Further, by disposing the cutting means 36 in the vicinity of the pair of auxiliary feeding rollers 34, 34, the film F can be reliably conveyed and the cutting position of the film F by the cutting blade 38a can be made more stable.

As shown in FIGS. 1 and 4, the cutting means spaced downstream of 36, the cutting means 36 edge seal portion 14 to the bent edge portion Fb immediately after once divided into a cover side and the article storage side An edge sealing means 40 is provided. The edge sealing means 40 has a width corresponding to the sealing margin Ft directed inward from the left and right outer edges without disturbing the film polymerization state of the bent edge Fb cut and formed by the cutting means 36. The polymerized film F is welded by heating. The edge sealing means 40 includes heating blocks 42 and 42 arranged at positions sandwiching the film F to be polymerized at each bent edge portion Fb. As shown in FIG. 2 (c), the folded edge Fb of the film F that is folded and flattened as the film F is conveyed passes through the gaps between the heating blocks 42, so that the film F The fold-over portion is welded.

  The heating blocks 42 and 42 are configured such that their positions can be adjusted independently of each other with respect to the transport center of the film F, and the distance between them can be adjusted. That is, by adjusting each heating block 42, it is possible to correspond to different bag widths of the package 10.

  As shown in FIG. 1, a crimping means 43 comprising a pair of pressing rollers 43a and 43a spaced from the edge seal 40 and receiving a portion heated by the edge sealing means 40 against the roller 43b is arranged. It is installed. By providing the pressure-bonding means 43, film welding with improved sealing performance can be achieved without being affected by the suitability of the film F for sealing. Further, a reinforcing seal means 44 is provided which is spaced downstream of the crimping means 43 and partially reheats on the edge seal portion 14 to weld the film F to obtain the unsealing portion 18. The reinforcing sealing means 44 can form the unsealing tear-stop part 18 in the conveying process to the bag making means 52 for forming the film F into a cylindrical shape after the edge sealing part 14 is formed by the edge sealing means 40. As shown in FIG. 5, the reinforcing sealing means 44 includes a pair of rotary sealers 46, 46 including a pair of sealing bodies 48, 48 that can be heated by sandwiching the film F at every predetermined timing. Each includes a seal piece 49 having a seal surface that can be reheated by partially sandwiching the edge seal portion 14.

  The rotary sealers 46 and 46 are rotated by a drive of a motor or the like at a predetermined timing in accordance with the conveyance of the film F for one package length, and are sealed by seal pieces 49 and 49 of a pair of seal bodies 48 and 48. The edge seal portion 14 is partially sandwiched. In the film F, the edge seal portion 14 is partially sandwiched between the pair of seal pieces 49, 49 and reheated, so that the unsealing portion having improved bonding strength compared to the portion not reheated. 18 is formed. As described above, according to the reinforcing seal means 44, the unsealing tear-stop portion 18 can be formed during continuous conveyance of the film F, and the seal body 48 can be used for a plurality of packaging varieties having different lengths. It is possible to easily cope with this by changing the timing of holding.

  As shown in FIG. 1, the flat folded film F on which the edge seal portion 14 is formed is developed in a band shape by a deployment means 50 disposed on the downstream side of the edge seal means 40. The unfolding means 50 includes, for example, unfolding guides 51 having left and right inclined guide portions 51a and 51a that widen from the upstream side toward the downstream side, and separates the overlapping edge portions of the film F folded on the lower side. In this way, the strip-shaped film F having two rows of the edge seal portions 14 and 14 at the center in the film width direction is developed.

  The film F developed in this way is formed into a rectangular tube shape with reference to the folding line previously given by the bag making means 52. In the rectangular tube-shaped film F formed so that the edge seal portions 14 and 14 are positioned on the left and right edges opposite to the overlapping edge of the film F, the articles G are spaced at predetermined intervals by a supply means such as a conveyor. Is supplied, and the overlapping edge portion in the transport direction in the tubular film F is heated by the vertical sealing means 54 to perform vertical sealing, and the vertical sealing portion 11 is formed. Further, the gusset forming means 56 including the gusset forming member 57 disposed opposite to each other across the conveyance path of the tubular film F is pushed inward along the inwardly folded portion Fa given to the center of the film F in the thickness direction. , And the horizontal seal is applied to the tubular film F and cut. The horizontal seal means 58 is composed of a pair of horizontal seal bodies 59 and 59 disposed with the conveyance path of the cylindrical film F interposed therebetween. Both the horizontal seal bodies 59 and 59 heated by the built-in heating body are cylindrical. The box film moves forward and backward along the conveyance direction of the film F and repeats the box motion motion in which the film F moves back in contact with each other and then abuts with each other again. The packaging film 10 is obtained by cutting the tubular film F along the width direction with a cutter (not shown) provided in the transverse seal body 59. The horizontal seal body 59 has an upstream seal surface for applying a horizontal seal corresponding to the rear side of the preceding article G in the tubular film F and a downstream seal surface corresponding to the front side of the subsequent article G. By providing the upstream seal surface so as to be separated, an unsealed portion 16 in which a lateral seal is not applied is formed between the cutting position by the cutter and the upstream lateral seal portion 12 in the obtained package 10.

  According to the above-described embodiment, the shape can be maintained by forming the edge seal portion 14 and the broken line, and the package can be opened as a large opening state between the two edge seal portions 14 and 14 with the cover side film and the article storage side film. The body 10 can be efficiently obtained from one film F. In the process of transporting the film F from the film supply source 20 to the bag making means 52, the notch means 36 is used to cut the film overlapping portions of the two bent edges Fb and Fb of the tubular film F, and the cover side The edge seal means 40 performs edge sealing on the bent edges Fb and Fb immediately after the film F is divided in the linear conveyance process without breaking the overlapping state of the film F divided on the article storage side. In continuous cutting, it is possible to prevent the overlapping positions of the overlapping positions of the edges of the two films F that are polymerized at the edge seal portion 14 from becoming uneven, and the good package 10 can be obtained without reducing the commercial value. can get. In addition, since the tubular film F is guided by the folding means 28 so as to be folded, it is brazed at each bent end of the inner folded portion Fa, the bent edge portion Fb, and the bent edge portion Fc. A beautiful gusset can be formed by bending at the inner folding portion Fa that is brazed when the tubular film F is pushed inward. Further, since the back side corner is formed by the bent edge portion Fc that is brazed on the article storage side film, the package 10 has a well-rounded corner without being guided by a molding die or the like on the downstream side of the bag making means 52. A cylindrical packaging form can be obtained. Since the opening portion is reinforced by the edge seal portions 14 and 14, the package 10 having a high added value that can prevent unintentional opening is obtained. Moreover, since the package 10 can be obtained from one film F, various problems resulting from the use of two films can be solved, and production efficiency can be increased.

  According to the embodiment, the pair of knives 38, 38 arranged with the cutting edge facing the inside of the tubular film F smoothly cuts the corresponding bent edge portion Fb from the left and right outside of the tubular film F. Can be formed. And since the edge seal part 14 is formed in the part divided by forming a cut with the knife 38 in each bent edge part Fb, by pulling one film F between the two edge seal parts 14, 14, The package 10 which becomes a wide opening state opening part can be obtained. Also, in anticipation of the polymerization deviation in the width direction of the two films, compared to the conventional method in which the film is polymerized and the sealed edge is cut off, no film scraps are generated and the cutting allowance is reduced. For this reason, it is not necessary to use a film having a sufficient width for the purpose of packaging, so that the amount of film used per package can be reduced and packaging in consideration of the environment can be achieved.

  The folding means 28 including the guide members 30 and 31 and the folding guides 32 and 32 can fold the tubular film F neatly to stably form the bent edge portion Fb and the edge seal portion 14. It is possible to prevent the outer shape of the package 10 having irregular finished dimensions. The downstream end side of the forming guide 26 in the film conveyance direction is formed in a trapezoidal cross section, and the inner surface of the film F is supported by the narrow guide member 30 and the wide guide member 31, so that the edge seal portion 14 at the left and right edge portions on the front side. , 14 can be obtained satisfactorily without losing shape. The seal margin Ft of the bent edge portion Fb guided and folded by the wide guide member 31 can be extended outward from the bent edge portion Fc guided by the narrow guide member 30 and folded. It is easy to seal the bent edge Fb.

(Example of change)
The present invention is not limited to the configuration of the embodiment, and can be modified as follows, for example. It should be noted that the present invention is not limited to the following modification examples, and various embodiments may be adopted for the configurations described in the examples within the scope of the gist of the present invention.
(1) In the embodiment, the film F drawn from the upper film supply source 20 is guided to the lower bag making means 52, and the longitudinal edge of the belt-like film F is polymerized downward to form the tubular film F. As an example of a horizontal bag making and filling machine to be obtained, the film drawn from the lower film supply source is guided to the upper bag making means, and the longitudinal edge of the belt-like film is polymerized upward to obtain a cylindrical film. Adopted horizontal bag making and filling machine with various forms such as arranging the film supply source on the side of the bag making means, or making the strip film into a cylindrical film polymerized on the side obtain. The film feeding method may be either intermittent or continuous feeding. Furthermore, it can be employed in various bag making and filling machines regardless of whether they are horizontal or vertical.
(2) The forming guide 26 of the forming means may be formed in a rectangular tube shape or other shapes as necessary in consideration of the film to be used and other film transport characteristics. Further, the configuration is not limited to the configuration in which the shape changes between the upstream side and the downstream side of the forming guide 26, and the same cross-sectional shape may be used from upstream to downstream.
(3) Instead of the folding guide 32, a fixed guide member that folds the tubular film F inward may be used.
(4) The cutting position of the cutting means 36 may be between the downstream side of the folding means 28 and the upstream side of the edge sealing means 40. For example, it is provided on the upstream side of the pair of auxiliary feeding rollers 34, 34. May be. It is possible to respond by appropriately setting the arrangement position according to the processing interval by each of these means.
(5) The edge sealing means 40 is a seal configuration in which the edge Fb is welded by passing the bent edge Fb through the heating block 42 that is spaced at an interval through which the film F can pass to heat the film F. Instead, for example, a seal form that is sandwiched between a pair of rotary seal rollers to obtain the edge seal portion 14 and other various seal forms can be adopted.

(6) The cutting blades 38a of the knives 38, 38 in the cutting means 36 are arranged in a substantially “C” shape in plan view symmetrical to the spread in the inclination direction of the embodiment or orthogonal to the transport direction of the film F You may arrange | position toward the direction to do. Moreover, the structure which forms a notch in the bending edge part Fb by making it rotate freely or rotationally drive as a disk shape provided with a cutting blade in a surrounding surface may be sufficient as a knife.
(7) The reinforcing seal means is configured to sandwich the film with a pair of sealers and move in the film transport direction, or when the film transport is intermittent feed, the film is sandwiched with the seal bar when the film transport is stopped. Various other sealing methods such as a configuration to be used can be adopted.

10 packaging body, 14 edge seal part, 20 film supply source, 34 auxiliary feeding roller,
36 cutting means, 38a cutting blade, 40 edge sealing means, 44 reinforcing sealing means,
46 Rotating Sealer, 49 Sealing Piece, 48 Sealing Body, 52 Bag Making Means, F Film,
Fb bent edge, G article

Claims (5)

The belt-shaped film (F) pulled out from the film supply source (20) is formed into a cylindrical shape by the bag making means (52) through a required conveyance path, and the article (G) is supplied into the cylindrical film (F). In the bag making and filling machine to obtain a package (10) by applying a predetermined seal to the tubular film (F),
In the transport path, the folded edge (Fb) is folded at the outer edge of the flat film (F) by folding the both sides of the cylindrical film (F) formed from the belt-like film (F) inwardly and folding it. Cutting means (36) that inserts a cutting edge (38a) between the overlapping surfaces of the bent edge (Fb) from the outside, and continuously forms a cut, and
Edge sealing means for separating the cutting means (36) to the downstream side in the film conveying direction and heating the bent edge (Fb) to form an edge seal portion (14) having a predetermined width continuous in the film conveying direction. (40). A bag opening portion forming apparatus in a bag making and filling machine.   The cutting edges (38a, 38a) can be adjusted independently of each other with respect to the transport center of the film (F), and the distance between the cutting edges (38a, 38a) can be adjusted. The bag opening part formation apparatus in the bag making and filling machine according to claim 1.   After the formation of the bent edge (Fb), a pair of auxiliary feed rollers (34, 34) sandwiching and feeding the film (F) that folds flatly in the transport path until reaching the edge seal means (40) 34), and the cutting means (36) is disposed in the vicinity of the downstream side of the auxiliary feeding roller (34, 34). apparatus.   The edge seal means (40) is separated from the downstream side in the film conveying direction, and the edge seal portion (14) formed by the edge seal means (40) is partially reheated and welded to open the tear-off portion (18 The bag opening portion forming apparatus in the bag making and filling machine according to any one of claims 1 to 3, wherein reinforcing sealing means (44) for obtaining the above is provided.   The reinforcing seal means (44) includes a rotary sealer (46) that is rotated at a timing in accordance with the conveyance of the film (F) for one wrapping length, and the rotary sealer (46) includes the edge seal portion ( 5. A bag opening portion forming device in a bag making and filling machine according to claim 4, further comprising a pair of sealing bodies (48, 48) that can be re-heated by being partially sandwiched between the sealing pieces (49). apparatus.

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