JP2006007630A - Bag manufacturing method/machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a spout to be fitted into a bag during its manufacturing, when the bag with the spout is manufactured. <P>SOLUTION: In this crosswise bag manufacturing method, film strips 11 and 12 are folded back or a plurality of the film strip pieces are lapped over each other, then the inner surfaces of the film strips 11 and 12 are mutually sealed together, while the film strip pieces are conveyed in their longitudinal direction, and a bag body 10 with the spout 16 inserted into a peripheral edge sealing part at the film edge, is continuously manufactured in a crosswise direction. That is, the method comprises the processes: l. A region 19, where the spout 16 is fitted, of the film strip 11 is preheated (preheating process), 2. The spout 16 is inserted into between the film strips 11 having the preheated region 19 before a side sealing part 14 is formed (spout insertion process), 3. At least a part of the preheated region 19 of the film strips 11 is stretched along the peripheral surface of the inserted spout 16 (stretching process), 4. The spout 16 is temporarily held up on the film strips 11 (temporary spout holding process), and 5. The film strips 11 and the spout 16 are sealed not less than once after the temporary holding process (spout sealing process). Also, the bag manufacturing machine is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bag making method and a bag making machine for manufacturing a bag body with a spout (spout port).

Conventionally, as a method of manufacturing a bag body with a spout, after manufacturing the bag body, there is a method of opening the bag body and attaching the spout to the opening by a seal (see, for example, Patent Documents 1 and 2).
As a manufacturing method of a bag body in which a straw for pouring is built in, there is one described in Patent Document 3. In the invention described in this document, a recess is preformed in the film, and duct means (a straw) is installed in the recess, and then temporarily fixed to seal the periphery of the straw.
JP-A-7-187202 JP-A-11-170405 JP-T 9-503970

Conventionally, in the manufacturing method of the bag body which has a spout in a peripheral seal part, since spout attachment is performed as a process after bag making, much time and cost were needed for manufacture. If spout attachment is possible during bag making, manufacturing time and cost can be reduced. However, conventionally, there has been no method for attaching the spout to the peripheral seal portion at the edge of the film on the bag making machine. The reason for this is that when a spout with a bulge is attached, the film detours along the peripheral surface of the spout, so that the edge on the side where the spout is attached is closer to the film transport direction than the part where the spout is not present. This is considered to be because the length along the length is shortened, the film is not smoothly fed, and the bag body is wrinkled or has poor sealing, and the cutting position shifts when the bag body is cut from the continuous film.
In the invention described in Patent Document 3 that provides means for solving such problems, a straw is attached at the center of the film. For this reason, even if the concave portion is formed deep or large by the preform, the above-mentioned feed dimension deviation is not made obvious, so there is no problem in bag making. However, in the present invention, since the straw is attached at the center of the film, there is a problem that the installation position and shape of the straw portion protruding outside the bag body are significantly restricted. Further, if one-side chamfering is performed in which a straw is disposed at the end of the film, only one side of the film shrinks, and there is a problem that a large-sized bag cannot be made.

  In addition, it is conceivable to seal the spout online after bag making on the bag making machine, but in this case, it is difficult to insert the spout into the bag body, and the apparatus becomes complicated. And it is difficult to make the position of a spout constant, and it is easy to shift the position. For this reason, it is necessary to sufficiently control the depth and angle at which the spout is attached to the bag body, it is necessary to carry out bag making at a low speed, and productivity is unavoidable.

  The present invention has been made in view of the above circumstances, and a manufacturing method and a bag making machine for manufacturing a spout-equipped bag body that can be attached to a peripheral seal portion at the edge of a film during bag making. The issue is to provide.

In order to solve the above problems, the present invention folds a belt-shaped film or stacks a plurality of films, and while transporting a double-leaf film in the longitudinal direction, the inner surfaces of the films are sealed to each other to form an edge of the film. A pre-sacking method for continuously manufacturing a bag body in which a spout is sandwiched between peripheral seal portions in a lateral direction, a preheating step of preheating a region of the film where the spout is mounted, and a side portion A spout insertion step of inserting a spout between the films having the preheated region before a seal portion is formed, and at least one of the preheated regions of the film along a peripheral surface of the inserted spout. After the stretching step of stretching the portion, the spout temporary fixing step of temporarily fixing the spout to the film, and the spout temporary fixing step, To have a spout sealing step of performing one or more times to provide a bag manufacturing method comprising.
Here, in the spout sealing step, it is preferable that the film and the spout are sealed twice or more.
It is preferable that the spout is provided at both end edges in the width direction of the film.
The stretching process can be performed simultaneously in the spout temporary fixing process and / or the spout sealing process.

In addition, the present invention folds a belt-shaped film or stacks a plurality of films, and while transporting a multi-leaf film in the longitudinal direction, seals the inner surfaces of the films to form a peripheral seal portion at the edge of the film. A pre-seal bag making machine for continuously producing a bag body sandwiched with spouts in a lateral direction, preheating a film transporting means for transporting the film, and preheating a region of the film where the spout is mounted. A spout sealing means for sealing the film and the spout, and a spout insertion means for inserting a spout between the films having the preheated region, and a spout temporary fixing means for temporarily fixing the spout. Is provided at one or more locations downstream of the spout temporary fixing means in the film transport direction. .
Here, it is preferable that the spout seal means is disposed at two or more locations along the transport direction of the film.
It is preferable that the film transporting unit is configured to transport the film in contact with the film at a position avoiding the spout.

According to the present invention, since the region where the spout of the film is mounted is preheated before the spout is inserted, the film is easily stretched along the peripheral surface of the spout when the spout is inserted between the films. And since the preheated area of the film is stretched along the peripheral surface of the spout, the edge on the side where the spout is attached is stretched to the same length as the opposite edge or the part where the spout does not exist, The accuracy of film feeding can be ensured. In this way, after inserting the spout, the area where the spout of the film is attached can be stretched, so that the film feed dimension is incorrect due to the insertion of the spout, film wrinkles or poor sealing, and the bag cutting position. This is less likely to occur.
In addition, if the spout is temporarily fixed to the film and then the film and the spout are further sealed twice or more, the spout can be spouted even during the short film transport pause time on the bag making machine where intermittent film transport is performed. The seal strength can be ensured, and the occurrence of sealing failure and leakage can be suppressed.

The present invention will be described below with reference to the drawings based on the best mode.
FIG. 5 is a drawing showing an example of a spouted bag manufactured according to the present invention, FIG. 5 (a) is a front view, and FIG. 5 (b) is a longitudinal sectional view.
In the spout-equipped bag body 10, a folded bottom film 12 is disposed between a pair of body films 11 and 11. These films 11 and 12 include a peripheral seal portion 13 (upper end seal portion) on the side where the spout (spout port) 16 is sandwiched, side seal portions 14 and 14 on the side end portions on both sides of the bag body, It is a standing pouch having a self-supporting property in which a bag is formed by welding at a bottom seal portion 15 on the opposite side to the spout 16.
The spout 16 has a flange portion 17 joined to the body film 11 and a cylindrical portion 18 protruding from the flange portion 17 to the outside of the bag body. The flange portion 17 may be omitted. However, the flange portion 17 is preferable because the film stretching process can be easily performed and sealing with the body film 11 at both end portions of the flange portion 17 is ensured. Moreover, the cylindrical part 18 does not need to be a simple cylinder, and may be provided with a lid or various attachments, or may be an irregularly shaped hollow body. In the present invention, since the spout 16 is sandwiched between the side edges of the body films 11 and 11, various spouts can be employed.

As the films 11 and 12 constituting the bag body, a laminate having a sealant on at least one side, for example, a polyolefin resin such as polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), and cyclic polyolefin The layer is the innermost layer (sealant), and a stretched film such as a biaxially stretched nylon film, a biaxially stretched polyethylene terephthalate film or a biaxially stretched polypropylene film is used as a base material, and an ethylene-vinyl alcohol copolymer, metal or A laminated film having an intermediate layer of a metal foil such as an inorganic compound vapor-deposited layer or an aluminum foil can be used, but is not particularly limited thereto.
As long as the trunk | drum film 11 and the bottom part film 12 can mutually join by welding etc., a material, thickness, etc. may mutually be the same, and may differ.

  The spout 16 has a thermoplastic resin layer that can be welded to the sealant layer of the trunk film 11 on at least the surface thereof, so that the spout 16 can be heat sealed to the trunk film 11. Materials for forming the spout 16 include polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), polyester such as polyethylene terephthalate (PET), polyamide such as nylon, adhesive polyolefin, Thermoplastics such as cyclic polyolefin and polybutylene can be used.

Next, an embodiment of the bag making method and bag making machine of the present invention capable of producing the spouted bag as described above will be described.
FIG. 1 is a schematic configuration diagram illustrating an example of the bag making machine according to the present invention, and FIG. 2 is a front view illustrating an appearance of the bag making machine illustrated in FIG. 1. Drawing 3 is an explanatory view explaining an example of the bag making method of the present invention. FIG. 4 is a partially enlarged view showing the spout temporary fixing means and the spout seal means.

A bag making machine 20 shown in FIG. 1 and FIG. 2 includes an original reel 21 on which an original film to be a body film 11 is wound, a reel 22 on which a film to be a bottom film 12 is wound, 12, a transport roller 23 (film transport means) for transporting 12, a preheating means 24 for preheating a region 19 where the spout 16 of the trunk film 11 is mounted, and a spout insertion for inserting the spout 16 between the trunk films 11, 11. Means 25, spout temporary fixing means 26 for temporarily fixing the spout 16 to the body film 11, spout sealing means 27 for sealing the body film 11 and the spout 16 after temporary fixing, and the body film 11 A bottom sealing means 28 for sealing the bottom film 12, a side sealing means 29 for sealing the body films 11 in the width direction perpendicular to the conveying direction, And a guillotine cutter 33 for cutting in a width direction orthogonal to Lum 11 in the conveying direction.
2, illustration of the preheating means 24, the spout insertion means 25, and the spout temporary fixing means 26 is omitted.

An original film (not shown) wound on the original reel 21 is cut into two body films 11 having the same width along the longitudinal direction of the body film 11 by a cutter (not shown). It arrange | positions so that the inner surfaces which have a sealant layer may oppose.
Reference numeral 31 denotes an alignment roll that deflects the transport direction of each body film 11 so that the upper and lower body films 11 are accurately overlapped with each other. The alignment roll 31 can be moved in the vertical direction, which is the direction in which the body film 11 is superimposed, and in the width direction of the body film 11 by a servo motor (first and second moving means, not shown). Has been. The servo motor is operated by an optical sensor (first and second detection means, not shown) for detecting the positions of the pattern / photoelectric tube mark and both ends in the width direction of the body film 11, and these optical elements. Based on the output value of the sensor, the pattern of the body film 11 and the photoelectric tube marks and the positions of both ends in the width direction are respectively compared to detect the positional deviation along the transport direction and the width direction of the upper and lower body films 11. It is controlled by control means (not shown).

  That is, in the case of the bag making machine 20 according to the present embodiment, the servo motor is operated based on the detection result of the optical sensor until the positional deviation along the transport direction and the width direction between the upper and lower body film 11 is eliminated. By moving the alignment roll 31 up and down and / or in the width direction of the body film 11, positional displacement between the body films 11 is prevented. For the optical sensor, for example, a phototube or a CCD camera is used.

After the bottom film 12 is inserted between the body films 11, 11, the body film 11 and the bottom film 12 are overlapped by the transport roller 23 and transported to the left side of FIG. 1 along the longitudinal direction thereof. Is done.
The transport roller 23 is driven by a servo motor 23a. In order to perform good sealing, the transport roller 23 preferably transports the films 11 and 12 intermittently at a constant cycle by a controller (not shown) and seals the films 11 and 12 and / or the spout 16. The transportation is suspended.
In FIG. 1, the upstream side in the transport direction is the right side of FIG. 1, and the downstream side in the transport direction is the left side of FIG.

As shown in FIG. 3, the bag making machine 20 places the pair of bag bodies 10 connected by the bottom seal portions 15 at symmetrical positions on both sides of the center line C along the longitudinal direction of the body film 11. The bottom film 12 is superposed in the vicinity of the center of the body film 11 in the width direction.
The region 19 to which the spout 16 is attached is provided at the edge T in the width direction of the body film 11 that is a film to which the spout 16 is attached. In FIG. 3, two two-dot chain lines F illustrated via the interval W indicate the boundary lines of the portions that become the pair of bag bodies 10.
In this case, as shown in FIG. 3, one of the transport rollers 23 is indicated by a two-dot chain line, and the portion of the transport roller 23 that contacts the body film 11 avoids the edge T to which the spout 16 is attached. Dimension can be provided. In other words, the thickness of the spout 16 is larger than that of the body film 11 (see FIG. 4). By reducing the diameter of this portion, the conveying roller 23 rides on the spout 16 and is positioned. The film 11 and 12 are transported stably by the transport roller 23 without causing misalignment or wrinkling of the film.
Here, a transport roller (nip roller) is used as the transport means 23, but instead of this, a pair of sandwiching bars in which a plurality of sandwiching members such as rubber are disposed in the width direction of the film is disposed in a pair. It is also possible to adopt a conveying means that sandwiches the film with the sandwiching bar and moves the film in the downstream direction.
In the case of the bag making machine 20 shown in FIGS. 1 and 2, an optical sensor 30 (photoelectric tube, CCD camera, etc.) that detects the feed amount of the films 11 and 12 by detecting the pattern / photoelectric tube mark of the body film 11 is provided. Has been placed. Further, a controller (not shown) for controlling the driving of the servo motor 23a (film driving means) based on the output value of the optical sensor 30 is provided. Thereby, the feed amount of the films 11 and 12 is controlled to a constant value.
The means for controlling the feed amount of the films 11 and 12 is not limited to the control based on the optical sensor 30. If pitch control is unnecessary such as a bag without a pattern, a servo motor is used instead. It is also possible to adopt a means for controlling the feeding of the films 11 and 12 to be constant by controlling the rotation amount of the 23a to be constant.

The preheating means 24 is a heater that heats at least a part of the region where the spout 16 is mounted in the body film 11. In FIG. 3, the portion 19 preheated by the preheating means 24 (hereinafter simply referred to as the preheating portion 19) is hatched. Although the preheating part 19 can be provided in the part by which the flange part 17 of the spout 16 is mounted | worn, for example, the part located outside the corner | angular part 17a of the flange part 17 among the upper edge parts 13 of the bag body 10. FIG. However, the preheating part 19 may be included.
By the preheating process, the preheating portion 19 is easily extended. As a method of heating the body film 11 by the preheating means 24, a non-contact method of radiating infrared rays or the like can be employed in addition to a contact method of directly contacting the heater. The heating side may be either from the inside or from the outside.
In the position of the preheating means 24, the trunk | drum films 11 can be spaced apart so that trunk | drum films 11 may not be sealed. Moreover, it is preferable to finish preheating immediately before the heat from the preheating means 24 melts the sealant layer of the body film 11 by appropriately adjusting the heating conditions of the preheating means 24 such as heating time and contact pressure. Is preferably heated from the outside of the body film 11.

After the preheating process, in the spout insertion process, the spout 16 is supplied between the trunk films 11 from a spout insertion means 25 such as a belt conveyor or a parts feeder that is intermittently driven in a direction intersecting the flow direction of the trunk film 11. The spout insertion means 25 is disposed so as to supply the spout 16 downstream of the preheating means 24 in the transport direction.
When the spout 16 is inserted between the body film 11 and the body film 11 is transported by the transport roller 23, the transport roller 23 pulls along the peripheral surface of the spout 16 (specifically, the outer peripheral surface of the flange portion 17). Thus, the preheating unit 19 is stretched (stretching step).
The film feed amount by the transport roll 23 that transports the trunk film 11 on the upstream side of the spout insertion means 25 and the film feed amount by the transport roll 23 that transports the trunk film 11 on the downstream side of the spout insertion means 25. By controlling to be equal, the preheating part 19 is extended by the amount required for the insertion of the spout 16. As a result, the edge on the side on which the spout 16 is mounted (the edges on both sides of the body film 11 indicated by the symbol T in FIG. 3) and the edge opposite to the spout 16 (in FIG. 3, the symbol C). Since the shift of the feeding amount of the trunk film 11 is suppressed on the side of the trunk film 11 shown), film feeding with high dimensional accuracy can be realized even after the spout 16 is attached.

By the way, when the preheating part 19 is formed before insertion of the spout 16 by applying a method of preforming the film before inserting the straw as described in the above-mentioned Patent Document 3, If the resulting shape is larger than the shape of the peripheral surface of the spout 16 or does not adhere to the peripheral surface of the spout 16, a gap is generated between the spout 16 and the body film 11 when the spout 16 is attached. There is a risk of causing wrinkles of the body film 11 and poor sealing of the spout 16.
On the other hand, in the bag making method of the present embodiment, after the spout 16 is inserted between the trunk films 11, the trunk film 11 is stretched by using the spout 16 itself as a mold, so that the trunk film 11 has a shape of the spout 16. It can be molded to fit snugly. In order to avoid the risk of wrinkles due to the above-described preforming and the sealing failure of the spout 16, it is also possible to perform preforming as a preliminary film stretching process, leaving room for the film to be finally stretched on the peripheral surface of the spout. it can. Such preforming can be realized by known vacuum forming, pressure forming, plug assist forming, or the like. Here, the preheating part 19 is preheated so as to be easily stretched, whereas the preheat is not applied to the body film 11 other than the preheating part 19, so before contacting the spout 16. The preheating part 19 does not substantially extend, and the dimensional accuracy of the body film 11 can be ensured.

Moreover, when the preheating part 19 is extended according to the shape of the spout 16, stress (stress) in the shrinking direction of the body film 11 around the spout 16 is reduced. When the stress of the film is large, when the contents are stored in the bag body 10, a minute crack of the film in the seal portion of the spout 16 may expand due to the contents and the bag may be broken by a small impact. This phenomenon is called stress cracking, and if the contents contain alcohol, oil, surfactant, soy sauce, etc. and have high permeability when sealing the film, the cracks are promoted by the penetration of the contents. And tend to be more prominent. According to the bag making method of the present embodiment, since the stress of the trunk film 11 around the spout 16 is small, the stress crack is suppressed and the bag body 10 excellent in impact resistance can be manufactured.
In addition, since the spout insertion step is performed before the side sealing step, the portion corresponding to the side end portion 14 of the bag body 10 is not sealed yet in the trunk film 11 during the spout insertion step. For this reason, since between the trunk | drum films 11 can be easily opened and closed by the edge T side of the trunk | drum film 11, it is preferable.

After the spout insertion step, the spout 16 is temporarily fixed to the body film 11 in the spout temporary fixing step. The spout temporary fixing step is preferably performed immediately after the spout insertion step unless the time for stopping the film conveyance is unnecessarily extended. This eliminates the risk of misalignment of the spout 16 associated with film transport. When the spout temporary fixing step cannot be performed immediately after the spout insertion step and a film transport step is involved, the inner surface of the preheating portion 19 is softened, and the film follows the shape of the peripheral surface of the spout 16. The spout 16 is less likely to be displaced when the spout 16 is clamped. However, depending on the shape and location of the spout, even if the spout is placed at the correct position in the spout insertion process, Since there is a possibility that the position may be shifted due to the conveyance, it is preferable to check and correct the position in the spout temporary fixing process.
The spout temporary fixing means 26 is a point seal device that partially seals between the body film 11 and the peripheral surface of the spout 16 as shown on the right side of FIG. 4, for example.
This point seal device 26 is a pair of molds arranged so as to face each other on both sides of the overlapped body film 11, and the spout 16 and the body film 11 on both sides (upper and lower sides in FIG. 3) are connected. It can be inserted and sealed.
The point seal device 26 is preferably in contact with only a part of the spout 16 (here, the central portion in the transport direction) from the viewpoint of reliable temporary fixing. In this case, only the portion where the point seal device 26 abuts is heated intensively, and sufficient sealing strength is provided between the spout 16 and the body film 11 within the time when the conveyance of the films 11 and 12 is stopped. Obtainable. It should be noted that the molds of the point seal device 26 do not necessarily have to be a pair, and may be only on one side as long as misalignment can be prevented.
In this temporary fixing step, it is sufficient that the spout 16 is temporarily fixed at least so that the relative position of the spout 16 with respect to the trunk film 11 is not shifted. However, when the spout 16 is small, the gap between the spout 16 and the trunk film 11 is sufficient. As long as a sufficient sealing strength can be obtained, a substantial part may be sealed. At this time, there may be a stretching process in which the preheating unit 19 is further stretched by the point seal device 26 in accordance with the shape of the spout 16.

After the spout temporary fixing step, the trunk film 11 and the spout 16 are sealed once or more in the spout sealing step.
For this reason, the spout seal means 27 for sealing the trunk | drum film 11 and the spout 16 is provided in the downstream of the spout temporary fix | stop means 26 in the conveyance direction. The spout seal means 27 is preferably provided at two or more places (here, three places) along the film conveyance direction. When the entire area of the spout 16 is heated at the time of temporarily fixing the spout 16, when the spout is small or made of a material that is easy to seal, the spout sealing process can be completed with a single seal. In this case, the spout seal means 27 may be provided at one place.

The spout seal means 27 is a sealing device having a pair of molds disposed on both sides of the body film 11 that is overlapped with each other, and the spout 16 and its both sides (upper and lower sides in FIG. 4) by both molds. The body film 11 can be sandwiched and sealed.
Since the spout 16 is sealed by the spout sealing means 27 a plurality of times, the spout 16 is sufficiently sealed so as not to leak around the spout 16.

1 and 4, among the three spout seal means 27, the most upstream spout seal means 27 (particularly, in the drawings, the reference numeral is distinguished as 27 A) is the upper edge of the bag body 10. 13 is integrated with an upper end seal member 32 that seals 13 and can seal the spout 16 and the upper edge portion 13 at the same time.
In this case, the stretching process is completed here, and the spout seal means 27B and the spout seal means 27C on the downstream side make the sealing of the spout 16 more reliable.
The present invention is not limited to this example, and the ABC order of the spout seal means 27 may be changed, and the seal of the upper edge portion 13 of the bag 10 is different from the seal of the spout 16. It can also be performed in a separate process using a member.

The number of spout sealing means 27 installed, that is, the number of times the spout 16 is sealed is preferably determined in view of the time required for sealing the spout 16 and the time required for sealing the films. That is, the time required for sealing the spout 16 tends to be longer than the time required for sealing the films, but in order not to unnecessarily extend the time for stopping the conveyance of the film for sealing, The time for stopping the transportation is determined based on the time required for sealing between the films. If the sealing of the spout 16 is insufficient for one transportation suspension time, it is sufficient to increase the number of times the spout 16 is sealed. Spout sealing time can be secured.
Conventionally, when the spout 16 is to be sealed to the body film 11 at one time, for example, when it is manually performed off-line or using the invention described in Patent Document 3, the corners of the flange portion 17 of the spout 16 that easily transmits heat. The resin constituting the spout 16 or the sealant of the film 11 may be excessively melted at the portion 17a (see FIG. 5) or the like, and a resin bulge called a “poly pool” may be generated. If there is a “poly pool”, there is a high possibility that the “poly pool” will break through the body film 11 when the bag body 10 receives an impact such as a drop. Moreover, since the spout 16 vicinity is a location which is easy for the user of the bag body 10 to see, it is not preferable in terms of appearance.
On the other hand, when the spout 16 is sealed twice or more after temporary fixing, the entire area around the spout 16 is sealed twice or more including a portion where the sealing is not performed in the temporary fixing step. Therefore, since the sealing strength of the spout 16 can be ensured even if the heating conditions (temperature, pressure, etc.) of the seal of the spout 16 are not so strict, the occurrence of “poly pool” is suppressed, and the impact resistance and aesthetics are excellent. The spouted bag 10 can be manufactured.
Further, the sealing is preferably performed a plurality of times, so that the preheating portion 19 is eventually stretched by the spout sealing means 27 and then sealed, and the residual stress after sealing can be reduced.
If the entire area of the spout 16 is heated during the temporary fixing of the spout 16, even if the spout seal after the temporary fixing process is once, it is equivalent to performing the sealing substantially twice or more together with the temporary fixing. An effect is obtained.

Moreover, it is preferable that the bottom part sealing process which seals the trunk | drum film 11 and the bottom part film 12 is performed in parallel with a spout sealing process. By synchronizing in this way, sealing can be performed a plurality of times without providing a section dedicated to the spout sealing process.
The time for the bottom sealing means 28 to seal the films 11 and 12 may be set so as to be synchronized with the time for the spout sealing means 27 to seal the trunk film 11 and the spout 16 or not. Here, the bottom sealing means 28 is provided at two locations along the conveying direction in accordance with the positions of the two upstream spout sealing means 27A and 27B among the spout sealing means 27. The bottom seal process is performed in synchronism with the spout seal process in accordance with the timing.
Note that the bottom sealing step may overlap with all or one or more of the spout insertion step, the spout temporary fixing step, and the side sealing step.

After the spout insertion step or the spout temporary fixing step, the films (the portions where the body films 11, 11 are sealed by the position of the bag body 10, and the portions where the body film 11 and the bottom film 12 are sealed) And a side sealing step of sealing in the lateral direction perpendicular to the film transport direction.
If the side seal process is after the spout insertion process, there may be a temporal overlap with the spout temporary fixing process or the spout seal process. In the present embodiment, among the spout seal means 27, one spout seal means 27 </ b> C on the downstream side is disposed between the side seal means 29.
In the side seal step, seal portions that become the side end portions 14 of the bag body 10 are formed at predetermined intervals along the transport direction of the films 11 and 12. Thereby, although the space in which the contents are accommodated is defined along the transport direction and is connected by the side end portion 14 and the bottom seal portion 15, the individual bag bodies 10 are formed.

After the side seal step, the center of the film, that is, the bottom seal portion 15 is cut into two by a leather cutter (razor) or a round blade cutter (not shown), and the bag body is composed of individual bag bodies 10 connected at the side end portion 14. The band is separated into two. At this time, it is preferable to use these cutters as a pair, and to remove the generated dove, since the edge of the bottom film 12 can be cut off and the self-supporting property is improved.
The leather cutter or the round blade cutter detects the position of both end edges T in the width direction of the body film 11 and detects an optical sensor (third detection means, not shown) along the width direction of the body film 11. And a servo motor (third moving means, not shown) that moves the cutter to the left and right in synchronization with the meandering based on the output result of the optical sensor.
That is, in the case of the bag making machine 20 of the present embodiment, the servo motor is operated based on the detection result of the optical sensor, and the cutter is moved to the left and right in synchronization with the meandering. A shift in the cutting position of the cutter (which may be caused by a shift in the width direction of the body film 11 accompanying the above meandering) is prevented. For the optical sensor, for example, a phototube or a CCD camera is used.

  After the bag band composed of the individual bag bodies 10 connected at the side end portions 14 is separated into two, the side end portions 14 are cut by the guillotine cutter 33 and separated into the individual bag bodies 10. . The portion to be cut is usually the center of the side end portion 14, but when the cutout or corner cut is provided in the bag body, it is preferable to cut the two portions near the center of the side end portion 14 to remove the dove. .

As described above, according to the bag making method and bag making machine of the present embodiment, the region where the film spout is attached is preheated before the spout is inserted, so when the spout is inserted between the trunk films. The film is easily stretched along the peripheral surface of the spout. And since the preheated area of the film is stretched along the peripheral surface of the spout, the upper edge, which is the edge on the side where the spout is attached, is the same length as the opposite edge or the part where there is no spout. Thus, the film feeding accuracy can be ensured. That is, it becomes difficult to cause an error in the film feed dimension due to the insertion of the spout, a film wrinkle or a sealing failure, a shift in the cutting position of the bag, and the like.
Moreover, since the film and the spout are further sealed once or more after the spout is temporarily fixed to the film, the sealing strength of the spout can be ensured, and the occurrence of sealing failure or leakage can be suppressed.

Furthermore, the spout and the film are sealed in two or more times, so that the spout can be more reliably sealed against the body film, and when the spout has a flange, excessive heating is performed. It is possible to suppress deformation such as a poly pool due to, and to improve the impact resistance of the bag body.
Since the bag body is formed by two chamfers arranged in two rows in the width direction perpendicular to the film conveyance direction, the production speed is doubled compared to the one chamfering in which the bag bodies are formed in one row. Can be improved.

Although the present invention has been described based on the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. .
For example, in the above embodiment, the standing pouch shown in FIG. 5 has been described. However, in the present invention, the form of the bag is not particularly limited. For example, a three-sided seal, a four-sided sealed flat bag, or a square bottom bag The present invention can also be applied to various types of packaging bags that can be prefabricated.
In the present invention, when the bottom film is omitted, for example, a method of sealing two body films and making a bag, one body film is folded in two along its longitudinal direction, and the center fold line is a bag. It goes without saying that the method of making the bottom of the body is also feasible.
Moreover, when the size of a bag body is large, it can also be set as 1 chamfering. In the case of one chamfering, a spout is attached to one edge of the film, and the other edge is the bottom of the packaging bag. A spout insertion process is performed after the preheating process which provided the preheating part 19 in the area | region where a spout is mounted | worn. Thereby, since the shift | offset | difference of the feeding amount of the trunk | drum film 11 is suppressed between one edge which is the side by which the spout 16 is mounted | worn, and the other edge which is the side opposite to the spout 16, Even after the spout 16 is mounted, the effect of the present invention that realizes highly accurate film feeding is remarkably exhibited.

The spout-equipped bag body 10 shown in FIG. 5 is one in which the spout 16 protrudes in a direction orthogonal to the upper edge portion 13 of the bag body, but the present invention is not limited to this.
For example, as shown in FIG. 6, the spout 16 can be applied to a bag body 10 </ b> A in which the spout 16 protrudes obliquely from the corner K of the bag body. In this case, the upper edge portion 13 which is the peripheral edge on the side where the spout 16 is sandwiched includes the corner portion K in contact with the notch portion. In order to manufacture the bag body 10A as shown in FIG. 6, by providing a notch from the edge T in the width direction of the body film 11, the body is positioned at a position corresponding to the corner K where the spout 16 is mounted. The edge of the film 11 can be taken out. And after providing the preheating part 19 in the area | region where the spout 16 is mounted | worn (preheating process), the spout 16 is inserted (spout insertion process), and also the periphery seal | sticker part 13 is provided and the spout 16 is mounted | worn (spout temporary). Stop process and spout seal process). The stretching process, the bottom sealing process, and the side sealing process can be performed in the same manner as the method for manufacturing the bag body 10 described above. Thereby, a bag can be made using the method and apparatus of the present invention.

  Further, as shown in FIG. 7, a peripheral edge seal portion 13a is provided at the corner K of the bag body, an opening 13b is provided adjacent to the corner portion K of the bag body, and the spout 16 is connected to the peripheral edge seal portion. It is also possible to apply to the bag 10B sandwiched between 13a. In this bag body 10B, since the spout 16 is positioned below the opening 13b, the spout 16 protrudes when the opening 13b is sealed and sealed after filling the contents from the opening 13b. There is an advantage that it does not get in the way.

FIG. 8 is a drawing for explaining a method of manufacturing the spouted bag 10B shown in FIG. In FIG. 8, the same reference numerals as those used in FIG. 3 indicate the same or similar configurations as those described with reference to the reference symbols in FIG. Omitted.
When the bag body 10B as shown in FIG. 7 is manufactured, for example, the spout 16 is mounted by providing a notch 41 from the edge T in the width direction of the body film 11 as shown in FIG. The edge of the trunk film 11 can be brought out at a position corresponding to the corner K. And after providing the preheating part 19 in the area | region where the spout 16 is mounted | worn (preheating process), the spout 16 is inserted (spout insertion process), and also the periphery seal | sticker part 13a is provided and the spout 16 is mounted | worn (spout temporary). Stop process and spout seal process). The stretching process, the bottom sealing process, and the side sealing process can be performed in the same manner as the method for manufacturing the bag body 10 described above. Thereby, a bag can be made using the method and apparatus of the present invention.

  The present invention can be used for manufacturing a spouted bag.

It is a schematic block diagram which shows an example of the bag making machine of this invention. It is an external view which shows an example of the bag making machine of this invention. It is explanatory drawing explaining an example of the bag making method of this invention. It is the elements on larger scale which show a spout temporary fix | stop means and a spout seal means. It is (a) front view and (b) longitudinal cross-sectional view which show an example of the bag body with a spout manufactured by this invention. It is a front view which shows the 2nd example of the bag body with a spout manufactured by this invention. It is a front view which shows the 3rd example of the bag body with a spout manufactured by this invention. It is explanatory drawing explaining an example of the method of manufacturing the bag body with a spout shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,10A, 10B ... Bag body, 11 ... Body film, 12 ... Bottom film, 13 ... Rim seal part (upper end seal part, upper edge part), 14 ... Side part seal part (side end part), 16 ... Spout DESCRIPTION OF SYMBOLS 19 ... Preheating part, 20 ... Bag making machine, 23 ... Film conveyance means (conveyance roller), 24 ... Preheating means (heater), 25 ... Spout insertion means (part feeder), 26 ... Spout temporary fixing means (point seal device) ), 27... Spout seal means, T.

Claims (7)

Folding a belt-shaped film or stacking multiple sheets, and transporting a double-leaf film in the longitudinal direction, the inner surfaces of the films are sealed and a spout is sandwiched between the edges of the film and a peripheral seal portion. A side-by-side bag making method for continuously producing a bag body in the lateral direction,
A preheating step of preheating a region of the film where the spout is mounted;
A spout insertion step of inserting a spout between the films having the preheated area before a side seal is formed;
A stretching step of stretching at least a portion of the preheated region of the film along a circumferential surface of the inserted spout;
A spout temporary fixing step of temporarily fixing the spout to the film;
After the spout temporary fixing step, a spout sealing step of sealing the film and the spout at least once,
A bag-making method comprising:   The bag making method according to claim 1, wherein the spout sealing step performs sealing of the film and the spout twice or more.   The bag making method according to claim 1 or 2, wherein a spout is provided at both edges in the width direction of the film.   The bag making method according to any one of claims 1 to 3, wherein the stretching step is performed simultaneously in the spout temporary fixing step and / or the spout sealing step. Folding a belt-shaped film or stacking multiple sheets, and transporting a double-leaf film in the longitudinal direction, the inner surfaces of the films are sealed and a spout is sandwiched between the edges of the film and a peripheral seal portion. A prefabricated bag making machine that continuously produces a bag body in the horizontal direction,
Film conveying means for conveying the film;
A preheating means for preheating a region where the spout is mounted in the film;
Spout insertion means for inserting a spout between films having the preheated region;
A spout temporary fixing means for temporarily fixing the spout;
With
Furthermore, one or more spout sealing means for sealing the film and the spout are disposed on the downstream side of the spout temporary fixing means in the film transport direction.   6. The bag making machine according to claim 5, wherein the spout sealing means is disposed at two or more locations along the transport direction of the film.   The bag making machine according to claim 5 or 6, wherein the film conveying means is configured to abut against the film at a position avoiding the spout and convey the film.

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