JP2012245999A - Self-standing packaging pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-standing packaging pouch capable of enhancing rigidity of a top sealing part for sealing the top of a head space part, and reducing deformation of the head space part as far as possible, and to provide a method of manufacturing the self-standing packaging pouch.SOLUTION: The pouch is configured to enhance the rigidity of the top sealing part 40 for sealing the top of the head space part H by bending the top sealing part along an inner edge on the inner side of the pouch body. After heat-sealing, while a film is softened by heat remaining after heat-sealing, the top sealing part 40 is bent.

Description

  The present invention relates to a technique for maintaining the shape of a head space portion of a self-supporting filling pouch filled with contents.

As a conventional self-standing filling pouch of this type, for example, a standing pouch described in Patent Document 1 is known. In this standing pouch, the film constituting the pouch body swells back and forth due to the pressure of the contents filled in the planar pouch body, and the bottom part is opened back and forth and held in a standing posture.
However, looking at the standing figure, the part containing the contents is kept in a three-dimensional shape with tension, but the upper head space part is not tensioned and is bent irregularly. For this reason, the standing at the store is not good, it is difficult to hold, and it tends to fall down as the content decreases.

JP 2008-290737 A

As a result of diligent examination of the deformation of the head space part, as a result of the pouch inflating back and forth due to the pressure of the content, the pouch is deformed in a direction in which the interval between the left and right side seal parts is narrowed. It has been found that a compressive force acts on both ends of the two-dimensional top seal portion to be deformed and the top seal portion is deformed.
The present invention has been made to solve the above-described problems of the prior art, and the object of the present invention is to increase the rigidity of the top seal portion that seals the upper portion of the head space portion with a simple configuration, and It is to provide a self-supporting filling pouch that can be stretched.

  In order to achieve the above object, the present invention provides a self-supporting filling pouch made of a film in which an upper portion of a head space portion of a self-supporting pouch body filled with contents is sealed with a top seal portion. The seal portion is bent along the inner edge on the inner side of the pouch body.

The present invention can also be configured as follows.
1. The side seal portion of the pouch main body is also bent along the inner edge on the inner side of the pouch main body.
2. The top seal portion seals the filling opening of the pouch body.
3. An opening guide portion is provided between the inner edge of the top seal portion inside the pouch body and the bent portion.

  Further, in the method for manufacturing a self-supporting filling pouch according to the present invention, the upper portion of the head space portion of the self-supporting pouch body filled with the contents is sealed by the top seal portion, and the top seal portion is disposed inside the pouch body. A method of manufacturing a self-supporting filling pouch that is bent along an inner edge, wherein the top sealing portion is disposed on the inner side of the pouch body in a state where the film is softened by residual heat after heat-sealing the filling opening. Fold along the inner edge.

According to the present invention, since the bending rigidity is increased by bending the top seal portion, it is difficult to buckle and deform by the compressive force acting on both ends of the top seal portion, and the deformation of the head space portion can be reduced. .
If the side seal part is also bent, the effect of preventing the deformation of the head space can be further enhanced.
When the top seal portion is a filling opening seal portion, it can be easily folded by existing equipment by utilizing the residual heat when heat sealing.
Moreover, if it is set as the structure which has an opening guide part, since a bending part will remain after opening, there exists a simple resealing function.

FIG. 1 shows a self-supporting filling pouch according to an embodiment of the present invention, where (A) is a front view, (B) is a side view, (C) is an enlarged sectional view of a bent portion, and (D) is a folded view. FIG. 4 is a diagram illustrating an example of a bending curve of a curved portion, (E) is a partially broken perspective view of a bottom surface portion, and (F) is a schematic perspective view illustrating a filling opening before sealing a top seal portion. 2 (A) and 2 (B) show a self-supporting filling pouch according to another embodiment of the present invention. (A) is a front view, (B) is a side view, and (C) is a bent portion. It is an expanded sectional view showing other examples of composition. FIG. 3 is a schematic explanatory view showing an example of the manufacturing process of the pouch of the present invention. FIG. 4 shows an example of a bending mold, (A) is a schematic perspective view, (B) is an explanatory view showing the bent state of the top seal portion, and (C) is only the outer mold of (A). It is a schematic perspective view shown. FIG. 5 shows another form of the notch and the easy-open line of the self-supporting filling pouch, (A) is a partial view before opening, and (B) is a partial view after opening. FIGS. 6A to 6C are diagrams illustrating a configuration example of a bending guide.

The present invention will be described below based on the illustrated embodiments.
FIG. 1 shows a self-supporting filling pouch according to an embodiment of the present invention. In the figure, 1 shows the whole self-supporting filling pouch, and this self-supporting filling pouch 1 has a top seal portion 40 that seals the upper portion of the head space portion H of a self-supporting pouch body 10 filled with contents. The top seal portion 40 is configured to be bent along the inner edge 40 i on the inner side of the pouch body 10.

  The pouch body 10 is composed of three films, a front film 102, a rear film 103, and a bottom film 105. The front film 102 and the rear film 103 have a quadrangular shape, and the left and right side portions overlapped are heat-sealed with a predetermined width at the side seal portions 121 and 121, and the bottom film 105 is formed at the lower ends of the front film 102 and the rear film 103. However, heat sealing is performed at the bottom seal portion 151.

  The bottom film 105 is folded in two and sealed so as to be sandwiched between the lower ends of the front film 102 and the rear film 103. The bottom film 105 is partially cut off at the left and right side portions of the bottom seal portion 151. The heat-weldable resin layer of the front film 102 and the rear film 103 is heat-sealed by point seal portions 152 and 152 to which the front-layer film 102 and the rear-surface film 103 are bonded through the notches.

When the pouch body 10 is not filled with contents, the top seal portion 40 is not sealed, and as shown in FIG. It is configured.
The filling opening 30 that opens at the upper end side of the pouch is filled with the contents W such as liquid, fluid, powder, granule or other solid matter, and the opening edge of the filling opening 30 has a predetermined width by thermal welding. The top seal portion 40 is formed.
As shown in FIG. 1 (B), the front film 102 and the rear film 103 of the filling pouch filled with the contents swell back and forth due to the pressure of the filled contents W, and as shown in FIG. 1 (E). Further, the bottom film 105 opens back and forth in a boat shape, and the lower end portion of the bottom seal portion 151 is grounded and held in a self-supporting state.

  The portion above the upper surface of the contents W is a head space portion H, and the top seal portion 40 is formed linearly over the entire upper side of the rectangular pouch body 10.

  The top seal portion 40 is folded back at the bend portion 50, but the bend portion 50 is not a seal portion where the front and rear films 102 and 103 are bonded together, but only by a predetermined dimension g from the inner edge 40i. It is located at a slightly separated position. Although depending on the thickness of the film, this dimension g is preferably at a position about 0.5 to 5 mm away.

  In this embodiment, the bent portion 50 is bent by two fold lines (a first fold line L1 and a second fold line L2) that are parallel at a predetermined interval h. Therefore, it is possible to solve the problem of the spring back that is likely to occur when folding is performed with a single folding line. In particular, in the present embodiment, the top seal portion 40 of the pouch 1 is folded until the inside of the portion where the top seal portion 40 is folded (folded) comes into surface contact. However, even in this case, the top seal portion 40 can be folded firmly.

If the end is to be folded with a single fold line, it can only be folded at a maximum of 180 [deg.], So it cannot be reliably folded unless the springback is completely eliminated. However, in practice, it is very difficult to completely eliminate the springback. On the other hand, if the folding is performed at two folding lines, it is possible to perform a bending process of 180 ° or more by the total of both, and the tip of the folded portion is formed on the unfolded portion of the pouch 1. On the other hand, it can be bent. Thereby, even if it considers a spring back, it becomes possible to fold the edge part of the top seal part 40 more reliably.
The configuration of the bent portion 50 does not need to be folded in two steps, and may be a one-step folded structure as shown in FIG. 2 (C). A configuration may be used, a round shape may be used, and a combination structure of valley folds and mountain folds may be used.
As shown in FIGS. 1 (A) and 2 (A), in order to make it easier to open the pouch body, the folded portion 50 is preferably folded on the side opposite to the top seal portion 40. In addition, at the position along the outer end edge of the top seal portion 40, a notch 61 is provided as an opening guide portion at least on the side edge of one side seal portion 121 in the illustrated example. At the position of the notch 61, an easy opening line 62 such as a score or a perforation for cutting the front film 102 and the rear film 103 of the pouch body is formed up to the other side seal part 121. The notch 61 may be formed in both side seal portions 121 and 121 on both sides.
5A and 5B, a notch 61 as an opening guide portion may be provided between the inner edge 40i of the top seal portion 40 on the inner side of the pouch body and the bent portion 50. Good. If it does in this way, since the bending part 50 remains even after opening, there exists a simple resealing function.
Furthermore, in the example of FIG. 5, the easy-opening process line 62a on the front film 102 side and the easy-opening process line 62b on the rear film 103 side are waved, and the phases of the waves are shifted from each other.
If it does in this way, the part which shifted | deviated will become a knob and will open easily.
When leaving the bent portion in this way, the distance between the inner edge 40i on the inner side of the pouch main body and the bent portion 50 is separated to the extent that the easy-open lines 62a and 63a can be formed. From the viewpoint of ease of taking out and utilizing the remaining heat of the heat sealing process for bending, the interval should be as narrow as possible, and is preferably about 15 mm at most.

Next, the operation of the self-supporting filling pouch according to the present embodiment will be described.
The part containing the contents W of the self-supporting filling pouch 1 is deformed so that the front film 102 and the rear film 103 swell back and forth by the pressure of the contents W, and the left and right side seal parts are side seal parts 121, It is displaced in the direction of narrowing the interval between 121. Due to the displacement of the side seal portions 121, 121, a load in the compression direction acts on both ends of the top seal portion 40.

  However, the top seal portion 40 is bent through the bent portion 50 and has a mountain-shaped three-dimensional structure with the bent portion 50 as a ridgeline. The form can be maintained. Therefore, the film surface of the head space portion H at the top of the pouch is held in a tensioned state without being deformed by the left and right side seal portions 121 and 121 and the bent portion 50 of the top seal portion 40.

  In addition, if the top seal portion 40 is not bent, the fingers are caught on the outer end portion and the touch is bad. However, if the top seal portion 40 is bent, the fingers touch the ridge line of the bent portion 50, so that the touch is smooth. A self-supporting filling pouch 1 can be realized.

In this embodiment, only the top seal portion 40 is bent, but FIG.
As shown in B), the side seal portions 121 and 121 may also be bent. The bent portions 60 of the side seal portions 121 and 121 are preferably a two-stage fold structure, similar to the top seal portion 40.
When the side seal portion 121 is also folded, the pouch width of the portion that becomes the bent portion 50 of the top seal portion 40 is narrow so that the bent portion 50 of the top seal portion 40 and the bent portion 60 of the side seal portion 121 do not overlap. It is preferable to keep it. The bending of the side seal portion has already been described in Tables 2008/001829, FIG. 10 and FIG.

  If the side seal portions 121 and 121 are also bent in this manner, the shape retaining property of the film portion of the head space portion is further improved. Moreover, a smooth pouch can be realized as a whole.

  The bending of the top seal portion 40 can be performed in a separate process on the pouch that has been filled and sealed, but is preferably performed using the residual heat in the heat sealing process. Heat sealing is generally performed in 2-3 stages including cooling in order to increase production speed. During transport between any of the heat sealing processes, especially when the film is softened due to the residual heat of the heat seal, between the end of heating and the cooling process, the top seal part is bent by a guide rail, etc. The crease may be brazed by sandwiching and pressing.

FIG. 3 is a schematic view of a heat sealing process after filling with a bending process added.
That is, the self-standing filling pouch 1A before sealing is transferred to the cooling step (III) through the heat sealing step (I) and the bending step (II) along the guide 203 while being held by the clamper 201. The

In the heat sealing step (I), the upper side of the pouch body 10 filled with the contents is heat sealed with a predetermined width by the pair of hot plates 205 and 205. The heat seal is welded by being heated up to the melting temperature of the heat fusion resin of the film constituting the pouch.
The entire film is softened by this heat, and is sent to the bending step (II) in a state where the residual heat remains.
In the folding step (II), the self-supporting filling pouch 1B after sealing is conveyed to a mold 210 for bending.
The self-supporting filling pouch 1 in which the top seal portion 40 is bent in the bending step (II) is further sent to the cooling step (III), cooled by the pair of cooling plates 207, 207, and the bent portion 5
The brazing of 0 is completed.

4A and 4B show an example of the mold 210 in the bending process, where FIG. 4A is an overall schematic perspective view, FIG. 4B is an explanatory view of a bent state, and FIG. 4C is a view showing only an outer mold. In the figure, the mold in the vertical state is shown in a horizontal state for easy understanding.
The position of the gap A in the mold 210 is configured to change from the horizontal state in the transport direction from the upstream side to the downstream side in the transport direction X, and the post-sealing filling during transport from the heat sealing process to the subsequent cooling process. The top seal portion 40 of the pouch 1B is passed through the gap A of the mold 210, and the top seal portion 40 is bent in the process of passing through the gap A.

More specifically, as shown in FIGS. 4A and 4C, the mold 210 includes an outer mold 213 provided outside the top seal portion 40 in the folding direction, and the top seal portion 40 in the folding direction. An inner mold provided on the inner side, and a gap is formed between the outer mold 213 and the inner mold.
The inner mold is disposed on the downstream side of the first inner mold 214 with respect to the first inner mold 214 for bending the top seal portion 40 at a first fold line L1 parallel to the conveying direction. And a second inner mold 215 for bending the top seal portion 40 at a second fold line L2 that is parallel to the first fold line L1 and shifted from the first fold line L1.

  As shown in FIG. 4B, in the conveyance direction X of the filling pouch 1B after sealing, in the region from (1) to (2), the gap between the outer mold 213 and the first inner mold 214 is Bending is applied. Then, in the region from (3) to (5) in the transport direction X, the bending process is performed by the gap between the outer mold 213 and the second inner mold 215.

The post-sealing filling pouch 1 </ b> B to be transported is inward at a first fold line L <b> 1 parallel to the transport direction X in the process in which the top seal portion 40 passes through the gap between the outer mold 213 and the first inner 214. It can be bent. Then, at the position (2) past the end of the first inner die 214, the outer die 213 is bent almost completely to 180 °. Further, when the end portion passes (2) in FIG. 4 (B), the outer mold 213 is once far away from the outside (T in FIG. 4 (B)), and is not restrained by the mold. The portion bent inward is slightly open outward (S in FIG. 4B).
In FIG. 4B, the region extending from (2) to (3) is a portion between the first inner mold 214 and the second inner mold 215, and the outer mold 213 is also widened outward ( This corresponds to F) in FIG.

  Then, the post-sealing filling pouch 1B is further conveyed to the downstream side, so that the second inner mold 215 starts to be restrained from the position (3) in FIG. 4 (B). Thereafter, in the process from the position (4) to (5) in the figure, the upper side portion of the intermediate post-sealing filling pouch 1B is moved in the transport direction by the gap between the outer mold 213 and the second inner mold 215. It is bent inward at a second fold line L2 that is parallel to X and slightly shifted inward from the first fold line L1.

  As described above, the post-sealing filling pouch P is bent in the first fold line L1 by the outer mold 213 and the first inner mold 214 in the process of passing through the mold 210, and the outer mold 213 and the second inner pouch P. The bending process at the second bending line L2 by the mold 215 is performed in stages. In addition, although the distance h between the 1st bend line L1 and the 2nd bend line L2 is greatly shown for convenience of explanation in Drawing 4 (B), it is 2.5 mm in this example.

In the case of one-step bending, a combination of an outer mold having a molding surface corresponding to (1) to (3) in FIG. 4B and the first inner side may be used, and it can be arranged in a short space.
Further, the bending means is not limited to the mold as in the above-described embodiment, but may be bent by applying a bending guide such as a rail.
FIG. 6 is an example of a bending guide having a flat configuration.
Basically, the structure corresponding to the molding surface of the mold 210 is taken, and a guide that restricts the inner side of the folding line (corresponding to the inner mold) and a guide that enables bending from the outer side (corresponding to the outer mold). It is configured to include.
In the example of FIG. 6, the first guide 311 that regulates the inside, the second guide 312 and the third guide 313 that are bent from the outside, the second guide 312 and the third guide 313 bend the top seal portion by 90 °. Is. If it does in this way, since it can comprise with a flat plate member, it is cheap. Of course, the bending guide is not limited to such a combination of flat plates, and may be configured by bending a plate-like member or in combination with a round bar member.
FIGS. 6B and 6C are partial schematic diagrams for explaining the bending state of each of the second guide 312 and the third guide 313.
Since the top seal part 40 and the bent part 50 are pressed and clamped by the cooling plate 207 in a subsequent process and cooled, even if the bending by the guide or the like is somewhat incomplete, the top seal part 40 and the bent part 50 can finally be reliably brazed.
In the above embodiment, the nozzle part and the pouch without the spout have been described as an example, but the pouch with the nozzle part formed at the end of the pouch body and the self-supporting filling pouch with the spout attached thereto. Similarly, the shape of the head space portion can be maintained by bending the top seal portion that seals the upper end portion of the head space portion.

DESCRIPTION OF SYMBOLS 1 Self-supporting filling pouch 10 Pouch main body 30 Filling opening 40 Top seal part 40i Inner edge 50 of a top seal part Folded part 60 Folded part (side seal part)
61 Notch (opening guide)
102 Front film, 103 Rear film, 105 Bottom film 121 Side seal part, 151 Bottom seal part, 152 Point seal part 201 Clamper 203 Guide 205 Hot plate 207 Cooling plate 210 Mold 213 Outer die 214 First inner die 215 Second inner Type A Gap H Head space portion L1 First fold line, L2 Second fold line W Contents

Claims (5)

In the self-supporting filling pouch made of film in which the upper part of the head space part of the self-supporting pouch body filled with the contents is sealed by the top seal part,
The self-supporting filling pouch, wherein the top seal portion is bent along an inner edge on the inner side of the pouch body.   The self-supporting filling pouch according to claim 1, wherein the side seal portion of the pouch body is also bent along the inner edge of the pouch body inside.   The self-supporting filling pouch according to claim 1 or 2, wherein the top seal portion seals the filling opening of the pouch body. The self-supporting filling pouch according to any one of claims 1 to 3, further comprising an opening guide portion between an inner edge of the top seal portion inside the pouch body and a bent portion. The upper part of the head space part of the self-supporting pouch body filled with the contents is sealed with a top seal part, and the top seal part is bent along the inner edge of the inside of the pouch body. A manufacturing method comprising:
A method for producing a self-supporting filling pouch, wherein the top sealing portion is bent along the inner edge of the inside of the pouch body in a state where the film is softened by residual heat after heat-sealing the opening for filling.

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