JP4451244B2 - Packaging bag sealing method, packaging bag, packaging bag sealing device, and bag making device - Google Patents

Description

  The present invention is a sealing method for sealing an opening of a packaging bag filled with contents, a packaging bag sealed by this sealing method, and used for sealing an opening of a packaging bag filled with contents. The present invention relates to a packaging bag sealing apparatus and a bag making apparatus including the sealing apparatus.

Conventionally, after filling a packaging bag made of a packaging film with contents (for example, liquid or viscous material), the opening of the packaging bag is sealed and sealed (for example, by heat sealing). . At this time, if the contents are present as impurities in the opening of the packaging bag, the moisture of the impurities may be vaporized by heat at the time of sealing, and the seal portion may foam due to expansion. In addition, the presence of impurities in the opening of the packaging bag may prevent the films from melting, and sufficient seal strength may not be obtained.
For this reason, Patent Document 1 discloses a method in which ultrasonic sealing is performed after heat sealing, and impurities are diffused and sealed in resin by ultrasonic vibration.
Patent Document 2 discloses a complete fusion region where the heat fusion layers of both films are sufficiently fused together and an incomplete fusion region where the heat fusion layers are slightly fused. A method is disclosed in which, by alternately forming in the width direction, impurities are allowed to escape to the incompletely fused region, and the seal strength is ensured by the completely fused region.
Japanese Patent Laid-Open No. 10-24908 JP 2000-203530 A

In the case of the method described in Patent Document 1, when the contaminants are concentrated in one place or when the amount of the contaminants interposed in the opening is large, the contaminants are not sufficiently dispersed or contained, and the sealing strength is increased. There are cases where it cannot be secured.
In the case of the method described in Patent Document 2, when the contaminants are concentrated in one place or the amount of the contaminants intervening in the opening is large, the contaminants cannot be accommodated in the incompletely fused region. There is a risk of entering the complete fusion zone. In this case, the foreign matter that has entered the complete fusion zone is heated while the sealant is melted, and the moisture in the foreign matter is vaporized and expanded, and the sealing strength may not be ensured by foaming.

  The present invention has been made in view of the above circumstances, and a packaging bag sealing method capable of ensuring sealing strength even when contaminants are concentrated in one place or the amount of contaminants is large, and this sealing method PROBLEM TO BE SOLVED: To provide a packaging bag sealed by the above, a sealing device for the packaging bag used for sealing the opening of the packaging bag filled with the contents, and a bag making apparatus provided with this sealing device. And

In order to solve the above-mentioned problems, the present invention is a sealing method for sealing an opening of a packaging bag filled with contents, the surface contacting the packaging film has irregularities, and the concave portion is at least the above-mentioned After heat-sealing the peripheral edge of the opening using a heat seal member formed so as to be continuous in a direction intersecting with the extending direction of the peripheral edge of the opening, the peripheral edge of the opening is extended in the extending direction. A sealing seal for a packaging bag, characterized in that a cooling seal member provided so as to form a plurality of cooling seal portions is cooled and sealed while cooling, and the peripheral edge portion of the opening is cooled and sealed. Provide a method.
The heat sealing is preferably performed using a heat sealing member having one or more convex portions surrounded by the concave portions.
The heat sealing is preferably performed using a heat sealing member having a recess that is continuous in the lateral direction along the extending direction of the peripheral edge of the opening.
After the cooling seal, it is preferable to further ultrasonically seal the peripheral edge of the opening using an ultrasonic seal member.
The ultrasonic sealing is preferably performed using an ultrasonic sealing member provided so that a mesh-shaped ultrasonic sealing portion can be formed.
The ultrasonic seal is preferably performed using an ultrasonic seal member provided so as to form an ultrasonic seal portion that is oblique to the extending direction of the cooling seal portion.

Moreover, this invention provides the packaging bag characterized by being filled with the content and opening being sealed with the sealing method of the above-mentioned packaging bag.
Further, the present invention is a sealing device used for sealing an opening portion of a packaging bag filled with contents, the surface contacting the packaging film has irregularities, and the concave portion is at least the opening. A heat seal member formed so as to be continuous in a direction intersecting with the extending direction of the peripheral portion of the portion, and after the heat sealing by the heat seal member, cooling along the extending direction of the peripheral portion of the opening In addition, the present invention provides a sealing device for a packaging bag, comprising a cooling seal member provided so as to form a plurality of cooling seal portions by performing strong sealing.
The packaging bag sealing device preferably further includes an ultrasonic sealing member provided so that an ultrasonic sealing portion can be formed after the cooling sealing by the cooling sealing member.
Moreover, this invention provides the bag making apparatus characterized by including the sealing apparatus of the above-mentioned packaging bag.

According to the present invention, the heat sealing member that comes into contact with the packaging film at the time of heat sealing has at least a recessed portion that intersects with the extending direction of the peripheral edge of the opening, so that the liquid contaminants are When it is interposed in the opening and bumped and foamed, the packaging film swells toward the concave portion of the heat sealing member, and a space communicating with the contents storage chamber of the packaging bag or the outside of the opening of the packaging bag can be formed. . Therefore, even if the foreign matter is concentrated in one place or the amount of the foreign matter intervening in the opening is large, the foreign matter can be smoothly dissipated or dispersed in the content storage chamber.
By performing a cooling seal that provides a strong seal while cooling after the heat sealing, the foamed contaminants are compressed while being cooled and condensed, so that the foam mark can be tightly sealed. Further, in the present invention, since a plurality of seal portions are formed along the extending direction of the peripheral edge portion of the opening portion by the cooling seal, impurities are dispersed and the opening portion can be reliably sealed.
Further, by performing ultrasonic sealing after the cooling seal, impurities can be more finely dispersed, the remaining impurities can be embedded in the sealing resin layer, and the opening can be more reliably sealed.

The present invention will be described below with reference to the drawings based on the best mode.
FIG. 1 is a drawing showing an example of a packaging bag, FIG. 1 (a) is a front view, FIG. 1 (b) is a longitudinal sectional view, and FIG. 1 (c) is a transverse sectional view. Moreover, FIG. 2 is sectional drawing which shows an example of the state before sealing the opening part of this packaging bag.
A packaging bag 1 shown in FIG. 1 is an internal space in which a packaging film 2 having a sealant layer made of a heat-adhesive resin is made on at least the innermost surface of the packaging bag 1 and the contents 3 are accommodated. (Content storage room) 4 is defined.
As shown in FIG. 2, the packaging bag 1 has a peripheral edge (opening edge) 6 of the opening 5 after filling the content storage chamber 4 of the packaging bag 1 with the content 3 such as a liquid or a viscous material. Is sealed by sealing a plurality of packaging films 2 and 2 facing each other.
The form of the packaging bag 1 is not particularly limited as long as a seal is necessary for bag making and / or sealing. The present invention is applicable to various forms such as a three-side seal bag, a four-side seal bag, a stick-type stick-type bag, a pillow-type packaging bag (back-attached bag), a gusset bag, a flat bag, and a standing pouch.

As the packaging film 2, a single-layer plastic film, a laminated film obtained by laminating multilayer plastics by coextrusion, a laminated film obtained by laminating metal foil such as aluminum foil, paper, or the like with plastic can be used. As an aspect of the packaging film 2 before sealing, for example, one sheet or a plurality of sheets, a tube, a bag, and the like can be exemplified. The present invention can be applied to a case where a single packaging film is folded and sealed, and a case where a plurality of packaging films are stacked and sealed.
Examples of the plastic used for the packaging film include polyolefin resins such as polyethylene and polypropylene, ethylene-vinyl acetate copolymers, polyester resins such as PET, polyamide resins such as nylon, and polycarbonate.
Examples of the heat-adhesive resin used as the sealant layer include thermoplastics such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyester, polyamide, adhesive polyolefin, cyclic polyolefin, and polybutylene.

When the opening 5 of the packaging bag 1 is sealed and sealed, the contents 3 may be interposed between the packaging films 2 and 2 to become impurities. Therefore, by sealing the opening 5 of the packaging bag 1 by the sealing method of the present invention, it is possible to ensure the sealing strength even when the impurities are concentrated in one place or the amount of the impurities is large.
The seal strength of the opening is not particularly limited, and varies depending on, for example, the size and use of the packaging bag. However, the seal strength after all the sealing steps are completed is, for example, 2 to 3 kg / 15 mm or more. It is preferable to do.

  Hereinafter, the packaging bag sealing method according to the present invention will be described with reference to FIGS. 3A, 3B, and 3C are partially enlarged front views in which a part of the opening edge portion 6 of the packaging bag 1 is enlarged as shown by part A in FIG. . FIG. 4A is a partial perspective view showing one embodiment of the heat sealing member. FIG. 4B is a partial perspective view showing another embodiment of the heat sealing member. FIG. 5A shows an example of a cross-sectional shape of the heat seal member, and is a cross-sectional view along a direction corresponding to the extending direction T of the opening edge. FIG.5 (b) is sectional drawing explaining an example of the state of the film for packaging pinched | interposed between the heat seal members. FIG. 6 is a drawing showing an example of the relationship between the width of the heat seal portion and the ultrasonic seal portion. FIG. 7 is a perspective view showing an example of a schematic configuration of the bag making apparatus of the present invention.

  In the bag making apparatus 20 shown in FIG. 7, the code | symbol 21 is a film formation means which bends the strip | belt-shaped packaging film 2 to a cylinder shape along the longitudinal direction. Moreover, the code | symbol 23 is a vertical seal apparatus which heat seals the side edge parts of the packaging film 2, and forms the vertical seal part 2a. Reference numeral 24 denotes a horizontal sealing device that forms a horizontal seal portion 2b by sealing in the horizontal direction perpendicular to the longitudinal direction of the packaging film 2 so that the packaging film 2 is closed. The code | symbol 25 is a filling nozzle which fills the content 3 in the cylindrical packaging film 2 in which the horizontal seal | sticker part 2b was formed.

  Here, as the film forming means 21, a formed plate formed in a plate shape having a film passage port 22 through which the packaging film 2 passes is used. This type of molding plate 21 curves the packaging film 2 that has passed through the film passage opening 22 along the periphery of the film passage opening 22, and overlaps the side edges on both sides of the packaging film 2 to form a cylinder. It can be molded.

The vertical sealing device 23 includes a pair of vertical sealing members, and the vertical sealing members 2 are sandwiched between the side edges of the packaging film 2 and thermally sealed, thereby forming the vertical sealing portion 2a on the packaging film 2. It has become.
The horizontal sealing device 24 includes heat sealing members 12 and 15 for heat-sealing the packaging film 2, a cooling seal member 17 for strongly sealing the packaging film 2 while cooling, and an ultrasonic wave for ultrasonically sealing the packaging film 2. The seal member 18 is provided.
The filling nozzle 25 is for supplying the contents 3 into the packaging film 2 formed into a cylindrical shape. In the illustrated bag making apparatus 20, the filling nozzle 25 penetrates the film passage port 22 of the molding plate 21 and packs it. It is arrange | positioned so that the film 2 for insertion may be penetrated.

In order to manufacture the packaging bag 1 together with the filling of the contents 3 using the bag making apparatus 20 shown in FIG. 7, first, the film-like packaging film 2 is drawn downward, while the film passing port 22 of the molding plate 21 is placed. By passing, the packaging film 2 is bent into a cylindrical shape. Next, using the vertical sealing device 23, the side edges of the packaging film 2 are heat-sealed to form the vertical sealing portion 2a, thereby forming the packaging film 2 into a cylindrical shape.
Furthermore, using the horizontal sealing device 24, the packaging film 2 is sequentially heat-sealed, cooled and ultrasonically sealed in the horizontal direction perpendicular to the longitudinal direction thereof to form the horizontal seal portion 2b. Further, the filling nozzle 25 fills the packaging film 2 on which the vertical seal portion 2a is formed with the content 3.

After the formation of the lateral seal portion 2b and the filling of the contents 3 in the lateral seal device 24 are completed, the packaging film 2 is cut by the cutting device (cutter) (not shown) so that the lateral seal portion 2b is cut into both sides. As shown in FIG. 1, a packaging bag 1 filled with contents 3 can be obtained.
In the packaging bag 1 of this invention, in order to improve the opening property of the packaging bag 1, an easy-opening means, such as a notch 1a and a perforation, can be provided. Such easy-opening means can be formed before, simultaneously with, or after separating each packaging bag 1 from the packaging film 2.

In the bag making apparatus 20, the sealing apparatus of the present invention can be used as the lateral sealing apparatus 24. Hereinafter, the horizontal sealing device 24 and the sealing method of this embodiment using the horizontal sealing device 24 will be described in detail.
As shown in FIG. 2, the opening 5 of the packaging bag 1 in the sealing method of the present embodiment is a portion opened above the packaging film 2 formed into a cylindrical shape, and above and below the packaging bag 1. As indicated by a two-dot chain line, the packaging film 2 remains connected.
The sealing method of the present invention can also be used when the packaging bag 1 having the opening 5 is manufactured in advance and separated, and then the contents 5 are filled to seal the opening 5.

In the sealing method of the present embodiment, first, as shown in FIG. 3A, the opening 5 of the packaging bag 1 is heat-sealed. In this heat sealing step, as shown in FIGS. 4 and 5, the packaging film 2 is heat-sealed by using a heat sealing member 12 having irregularities on the surface in contact with the packaging film 2. The recess 13 of the heat seal member 12 is continuous in at least the direction intersecting the extending direction T of the peripheral edge 6 of the opening 5 of the packaging bag 1.
For example, as shown in FIG. 4A, the uneven pattern of the heat seal member 12 can be a vertical stripe extending in a direction intersecting the extending direction T of the opening edge 6, but more preferably, As shown in FIG. 4B, it has one or more convex portions 14 surrounded by the concave portion 13. Further, the recess 13 of the heat seal member 12 is preferably continuous also in the lateral direction along the extending direction T of the opening edge 6. The shape of the convex portion 14 can be any shape such as a square, a rectangle, a rhombus, a triangle, a quadrangle, a hexagon, a circle, and an ellipse, and is not particularly limited.

The depth d of the recess 13 (see FIG. 5A) can be appropriately determined according to the manufacturing conditions such as the total thickness of the packaging film 2, the thickness of the sealant layer, the heating temperature, etc. As shown in b), the packaging film 2 swells toward the concave portion 13 of the heat seal member 12, and a gap 16 is formed between the packaging films 2, or even if no gap 16 is formed, the packaging film 2 is not strongly sealed. Make it deep enough to be pressed weakly. The depth d of the recess 13 can be, for example, about three times the thickness of the packaging film 2.
In FIG. 5, the other heat seal member 15 disposed to face the heat seal member 12 having the recess 13 has a flat surface, but the present invention is particularly limited to this. Instead, the surfaces of both seal members may be uneven.

As shown in FIG. 5 (b), when the packaging film 2 is heat-sealed using the heat seal member 12 having irregularities, the pressing force is reduced at the locations corresponding to the concave portions 13 and corresponds to the convex portions 14. The pressing force increases at the points. That is, a distribution occurs in the pressure for pressurizing the packaging film 2 corresponding to the unevenness of the surface of the heat seal member 12. For this reason, the packaging film 2 swells to the recess 13 side of the heat seal member 12, and the gap 16 is not formed between the packaging films 2, or does not swell to the recess 13 side. A pseudo-seal part 8 with an incomplete seal is generated. Further, the portion pressed by the convex portion 14 of the heat seal member 12 is sufficiently sealed by the heat seal to become the heat seal portion 9.
In addition, the pattern of the pseudo seal part 8 and the heat seal part 9 of the packaging film 2 does not necessarily match the pattern of the concave part 13 and the convex part 14 of the heat seal member 12, for example, the convex part 14 abuts. There may be a case where the heat seal portion 9 slightly expands around the location.

Although the pseudo seal portion 8 is incompletely sealed, it needs to be sealed by being heated by heat conduction during heat sealing. From this point of view, it is preferable that the other heat seal member 15 disposed to face the heat seal member 12 having the recess 13 has a flat surface.
The pseudo seal portion 8 is continuous at least in a direction intersecting with the extending direction T (see FIGS. 1 and 3) of the opening edge portion 6. With this configuration, when the contaminants 7 are present in the opening 5, the packaging film 2 swells toward the concave portion 13 of the heat seal member 12, and the internal space 4 of the packaging bag 1 or the opening of the packaging bag 1 is opened. A space communicating with the outside of the portion 5 can be formed. In particular, when the present invention is applied to a vertical pillow filling machine, it is preferable because the foreign matter 7 is allowed to escape into the packaging bag 1 regardless of whether the space communicates with the upper and lower sides. More preferably, it is preferable that the opening edge 6 is also continuous in the lateral direction along the extending direction T. In the form shown in FIG. 3, the heat seal portions 9 are dotted in a large number so as to be surrounded by the pseudo seal portions 8.

  In this embodiment, the pseudo seal portion 8 is continuous in the extending direction T of the opening edge 6 and the direction orthogonal thereto. As a result, the contaminant 7 can escape into the gap 16 between the packaging films 2 generated in the pseudo seal portion 8, and the contaminant 7 can be dispersed in the pseudo seal portion 8. Therefore, even if the contaminants 7 are concentrated in one place or the amount of the contaminants 7 interposed in the opening 5 is large, the contaminants 7 can be smoothly dispersed, and the contaminants 7 are heat sealed. Intrusion into the portion 9 is suppressed, and in the heat seal portion 9, the packaging films 2 can be firmly fused.

After the heat sealing step, a cooling sealing step is performed in which a strong sealing is performed while cooling. The cooling seal needs to be started while the opening edge 6 of the packaging bag 1 is heated by the heat sealing process and the resin of the sealant is melted. The cooling seal is performed so that a plurality of cooling seal portions 10 extending along the extending direction T of the peripheral edge portion 6 of the opening 5 can be formed. As an apparatus for performing such a cooling seal, for example, although not shown, a cooling seal member made of a metal mold having a plurality of continuous protrusions can be used. It is preferable to use a cooling seal device in which cooling means such as a cooling water circulation path is built in the cooling seal member. In the cooling sealing step, the cooling sealing member can be paired and brought into contact with the opening edge 6 of the packaging bag 1, the packaging film 2 is sandwiched by the cooling sealing member, and the cooling sealing is performed by cooling with clamping. .
Since the sealant layers of the packaging film 2 are pressed and cooled by the cooling seal, the heat-adhesive resin of the sealant layer is cooled and solidified to improve the seal strength. Moreover, since the contaminant heated at the time of a heat sealing process is cooled in a cooling sealing process, the water | moisture content in a contaminant can be condensed and foaming can be suppressed.

As shown in FIG. 3B, in the cooling seal process, a plurality of seal portions 10 (hereinafter also referred to as cooling seal portions 10) by the cooling seal are provided along the extending direction T of the opening edge portion 6. Form.
In this way, by forming the striped cooling seal portion 10, the contaminants 7 are dispersed between the cooling seal portions 10, so that the contaminants 7 that have deteriorated due to heat or with time are stored in the internal space 4 of the packaging bag 1. When the opening contents 6 of the packaging bag 1 mixed with the contained contents 3 or continuously made and filled are cut and the respective packaging bags 1 are separated, impurities 7 are removed from the cut portions. It will not spill or ooze out.
The striped cooling seal portion 10 can be formed, for example, by using the cooling seal member 17 having a plurality of strips on the surface in contact with the packaging film 2.

Since the seal of the cooling seal portion 10 seals the opening 5 of the packaging bag 1, the strength and width are secured so that the contents 3 do not leak. Even if the cooling seal portion 10 in the vicinity where the contaminants 7 are present cannot be completely prevented from passing through the contents 3 and the contaminants 7, the plurality of cooling seal portions 10 are provided side by side, so Leakage of the object 7 can be reliably prevented.
It is desirable to ensure the interval between the cooling seal portions 10 to such an extent that the contaminants 7 can be confined therebetween. When the pseudo seal portion 8 in the heat sealing process is continuous in the extending direction T of the opening edge portion 6, as shown in FIG. If the size is increased so that the connection in the extending direction T of the opening edge portion 6 of the pseudo seal portion 8 can be maintained, the dispersion of the impurities 7 along the extending direction T of the opening edge portion 6 becomes easy. ,preferable.

In the present invention, although not essential, it is preferable to perform ultrasonic sealing on the peripheral edge 6 of the opening 5 of the packaging bag 1 after the cooling sealing step.
The ultrasonic sealing member 18 includes a horn 18a that generates ultrasonic waves, and an anvil 18b that is disposed to face the horn 18a. The ultrasonic seal sandwiches the packaging bag between the horn 18a and the anvil 18b, generates heat inside the material of the packaging bag by ultrasonic vibration transmitted from the horn 18a, and eliminates and / or crushes the contaminants 7. The packaging film is welded and sealed while being embedded in the resin.

As shown in FIG. 6, the width of the region where the seal portion 11 formed by ultrasonic sealing (hereinafter sometimes referred to as the ultrasonic seal portion 11) is formed is the width of the region where the heat seal portion 9 is formed. It can also be narrower than the width. FIG. 6 shows the horizontal seal portion 2b in a state where a plurality of packaging bags 1 shown in FIG. In FIG. 6, the region where the heat seal portion 9 is formed is illustrated by vertical hatching, and the region where the ultrasonic seal portion 11 is formed is illustrated by mesh-like hatching.
By making the width of the ultrasonic seal portion 11 narrower than the width of the heat seal portion 9, the ultrasonic seal portion 11 can be prevented from protruding from the heat seal portion 9. That is, when the ultrasonic seal portion 11 protrudes from the heat seal portion 9, if the vibration and high pressure of the ultrasonic seal are directly applied to the portion that is not heat sealed, a part of the seal layer resin of the film 2 is crushed. Although there is a possibility that fine fragments of the film 2 that may occur at that time may be mixed into the contents 3, such a problem can be prevented.

As shown in FIG.3 (c), it is preferable that the ultrasonic seal | sticker part 11 is mesh shape. Here, the mesh shape includes a diamond shape, a square shape, a staggered shape, and the like, and the mesh shape includes a lattice shape. As a result, the pseudo seal portion 8 is divided into a narrow region surrounded by the mesh of the ultrasonic seal portion 11, so that the contaminants 7 can be further finely dispersed and contained in the individual regions.
Furthermore, the ultrasonic seal portion 11 is preferably formed in a direction oblique to the extending direction of the cooling seal portion 10. By comprising in this way, the foreign substance 7 can be finely disperse | distributed and enclosed also in the area | region enclosed by the ultrasonic seal | sticker part 11 and the cooling seal | sticker part 10. FIG. In addition, in FIG.3 (c), although the crossing angle of the cooling seal | sticker part 10 and the ultrasonic seal | sticker part 11 is about 45 degrees, it is not specifically limited to this.
In order to form the ultrasonic seal portion 11 having the predetermined pattern as described above, for example, an edge (convex portion) is provided on the surface of the horn and the anvil according to the predetermined pattern, and the convex portion of the horn and the anvil are It can carry out by aligning a position with a convex part and pinching the packaging film 2 between both convex parts. By engaging the convex portions of the horn and the anvil, the ultrasonic seal portion 11 without interruption can be formed in a predetermined pattern. The convex portion may be provided by either the horn or the anvil.

By performing ultrasonic sealing, the number of sealing portions increases, so that the gaps between the films of the openings can be more reliably sealed. In particular, when the shape of the ultrasonic seal portion 11 is made into a mesh shape, or the ultrasonic seal portion 11 is formed in a direction oblique to the extending direction of the cooling seal portion 10, the inside of the mesh and the ultrasonic seal portion 11 and the cooling seal are formed. The impurities 7 can be dispersed also in the area surrounded by the part 10.
Further, in the conventional sealing method, for example, there are portions where the number of overlapping packaging films is different (for example, two portions and four portions), such as a hand-wrapped packaging bag or a gusset bag, and there is a difference in level. When this occurs, there is a risk of through-holes in the stepped portion of the film causing leakage of contents or invasion of external germs. However, according to the sealing method described above, since the opening is sealed by the cooling seal and the ultrasonic seal, a reliable sealing without a through hole is possible.

Further, the contaminants 7 can be removed and / or crushed by ultrasonic sealing and embedded in the resin, so that the opening is more completely sealed.
Conventionally, in ultrasonic sealing, vibration and high pressure of the ultrasonic sealing are applied, and particularly when the packaging bag is made of a soft packaging material, the resin itself of the packaging film 2 is crushed and the sealing portion and its edge. There is a case where the strength of the is lowered. However, in this embodiment, heat sealing and cooling sealing are performed before ultrasonic sealing, so that the packaging films 2 are firmly bonded to each other, and unnecessary vibration of the resin layer is suppressed. Can withstand vibration and high pressure of sonic seal.

When opening the packaging bag 1 according to the present embodiment, the cut is made so as to cut the horizontal seal portion 2b in the horizontal direction (the horizontal direction in FIG. 1A) from the notch 1a and serve as a discharge port for the contents 3 Open. When the content 3 is an oral medicine, food or drink, etc., the content 3 can be directly poured out from the obtained cut into the user's mouth and ingested.
Conventionally, the incision is shifted obliquely, and the contents may spill out when opened, or the contents may be discharged in an unexpected direction when the contents 3 are taken out with the incision facing downward. On the other hand, in the case of the packaging bag 1 according to the present embodiment, the cooling seal portion is formed in the horizontal direction along the extending direction of the peripheral edge portion of the opening, so that the cut end extends along the horizontal line of the cooling seal portion. Thus, the direction of cutting is guided, and it is easy to cut, so that a normal drinking mouth can be easily obtained.

As described above, according to the sealing method and the sealing device of the packaging bag according to the present embodiment, even if the contaminants are concentrated in one place or the amount of the contaminants interposed in the opening is large, Since foreign matters can be escaped into the pseudo seal portion or the internal space of the packaging bag communicated through the pseudo seal portion, the foreign matters can be smoothly dispersed.
By performing a cooling seal after the heat sealing, foreign substances are cooled, so that foaming can be suppressed. Further, since the cooling seal forms a plurality of strong cooling seal portions along the extending direction of the peripheral edge portion of the opening portion, the opening portion of the packaging bag can be reliably sealed.

Furthermore, by performing ultrasonic sealing after the cooling seal, the sealing strength of the opening can be further increased. Further, impurities can be removed and / or crushed by ultrasonic sealing and embedded in the resin, and the opening can be more completely sealed.
According to the bag making apparatus of this embodiment, the manufacture of the packaging bag and the filling of the contents can be performed with one apparatus.

As mentioned above, although this invention has been demonstrated based on suitable embodiment, this invention is not limited to the above-mentioned example, Various modifications are possible in the range which does not deviate from the summary of this invention.
In the above embodiment, an example of a packaging bag having one internal space (storage chamber) filled with contents and one opening to the storage chamber is shown as the packaging bag. The present invention can also be applied to packaging bags having a plurality of storage chambers, packaging bags having a plurality of openings, and the like.
In the case of a packaging bag having a plurality of openings, the sealing method of the present invention can be applied when sealing the openings after filling the contents. Therefore, in the case of a packaging bag having a mouth that can be closed by means other than the seal, such as a spout with a cap, in addition to the opening closed by the seal, the technical idea of the present invention is closed by the seal. If applied to the opening, it is within the scope of the present invention.

  9 μm thick aluminum foil (Al) is used as an intermediate layer, 12 μm thick polyethylene terephthalate (PET) is laminated on one side of the aluminum foil, and 12 μm thick polyethylene terephthalate (PET) is laminated on the other side of the aluminum foil. A PET / Al / PET / PE four-layer laminated film in which polyethylene (PE) having a thickness of 50 μm was laminated by dry lamination was used as a packaging film. A stick-type bag with a palm-attached shape as shown in FIG. 1 was formed so that the inner surface of the bag was PE. The outer dimensions of the packaging bag were about 25 mm wide and about 130 mm long.

As shown in FIG. 3 (a), the packaging bag is filled with a content made of a mixture containing a liquid substance having high fluidity and permeability to the gap between the films and a substance having a high degree of crystallinity. The opening was heat sealed.
As shown in FIGS. 4B and 5A, the heat seal member has a lattice-shaped concave portion 13 and a dot-shaped convex portion 14 surrounded by the lattice-shaped concave portion 13, and the depth d of the concave portion 13 is about 300 μm. The heat sealing member was used. Here, the length of one side of the convex portion 14 was about 600 μm, and the interval between the convex portions 14 (width of the concave portion 13) was about 600 μm.

After the heat sealing, as shown in FIG. 3B, a stripe-shaped cooling seal portion 10 was formed by a cooling seal.
Here, as the cooling seal member 17, a member having a width of about 200 μm, an interval of about 2000 μm, and a plurality of 26 protruding ridges in parallel is used on the surface in contact with the packaging film 2. .

Further, after the cooling seal, as shown in FIG. 3C, a lattice-shaped ultrasonic seal portion 11 intersecting with the cooling seal portion 10 at an angle of 45 ° was formed by an ultrasonic seal.
Here, as the ultrasonic seal member 18, a member provided on the surfaces of the horn 18 a and the anvil 18 b and having a width of about 200 μm and a distance of about 1400 μm and a plurality of protrusions projecting in a mesh shape is used. It was. The holding time for continuing the ultrasonic oscillation was about 0.25 seconds.

Thereby, the foreign substance 7 was distributed between the seal parts 10 and 11 which cross | intersect mutually. The dispersion state of the foreign matter 7 was verified and confirmed by an enlarged image of the seal portion. In addition, in each of the seal portions 9, 10, and 11, the sealant layers melted together, and there was no deterioration of the base material or leakage of the contents, and a strong seal strength was obtained. The leakage of the contents was verified and confirmed by vacuum depressurization at a pressure of -0.092 MPa and a pressure withstand pressure by a pressure of 90 kgf / cm ² (90 kgf = 882 N). That is, the packaging bag can be completely sealed.

  INDUSTRIAL APPLICABILITY The present invention can be used, for example, for sealing an opening of a packaging bag after filling a packaging bag made of a packaging film with contents (for example, liquid, viscous material, powder, granule, etc.). . In particular, when filling and packaging liquid substances that are vaporized by heating at the time of heat sealing, such as moisture and alcohol, or contents containing components or solids that crystallize with them, the seal at the opening becomes a contaminant seal. In this case, foaming of the seal portion due to bumping expansion of the liquid substance is suppressed, and the remaining crystals and solids are smoothly dispersed to ensure sufficient seal strength.

It is (a) front view which shows an example of a packaging bag, (b) longitudinal cross-sectional view, (c) transverse cross-sectional view. It is a longitudinal cross-sectional view which shows the state before sealing the opening part of a packaging bag. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the sealing method of this invention, (a) The state after heat sealing, (b) The state after cooling sealing, (c) It is explanatory drawing which shows the state after ultrasonic sealing. . (A) It is a fragmentary perspective view which shows one example of a heat seal member. (B) It is a fragmentary perspective view which shows the other example of a heat seal member. (A) It is sectional drawing which shows an example of the cross-sectional shape of a heat seal member. (B) It is sectional drawing explaining an example of the state of the film for packaging pinched | interposed between the heat seal members. It is drawing which shows an example of the relationship of the width | variety of a heat seal part and an ultrasonic seal part. It is a perspective view which shows an example of schematic structure of the bag making apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Packaging bag, 2 ... Packaging film, 3 ... Contents, 4 ... Internal space (content storage chamber), 5 ... Opening part, 6 ... Peripheral part (opening edge part) of opening part, 7 ... Contaminant, 8 ... Pseudo seal part, 9 ... Seal part by heat seal (heat seal part), 10 ... Seal part by cooling seal (cooling seal part), 11 ... Seal part by ultrasonic wave (ultrasonic seal part), 12 ... Heat seal member, 13 ... concave portion of heat seal member, 14 ... convex portion of heat seal member, 15 ... other heat seal member, 16 ... gap between films, 17 ... cooling seal member, 18 ... ultrasonic seal member, 20 DESCRIPTION OF SYMBOLS ... Bag making apparatus, 21 ... Molding plate (film forming means), 22 ... Film passage port, 23 ... Vertical seal device, 24 ... Horizontal seal device, 25 ... Filling nozzle.

Claims (10)

A sealing method for sealing an opening of a packaging bag filled with contents,
Using the heat seal member formed so that the surface abutting against the packaging film has irregularities, and the concave portion is continuous at least in the direction intersecting with the extending direction of the peripheral edge of the opening. After heat sealing the periphery,
A cooling seal member provided so as to form a plurality of cooling seal portions by cooling strongly along the extending direction of the peripheral portions of the openings to cool the peripheral portions of the openings. A method for sealing a packaging bag, comprising sealing.   The packaging bag sealing method according to claim 1, wherein the heat sealing is performed using a heat sealing member having one or more convex portions surrounded by the concave portion.   3. The packaging bag according to claim 1, wherein the heat sealing is performed using a heat sealing member having a recess that is continuous in a lateral direction along an extending direction of a peripheral edge of the opening. Sealing method.   The method for sealing a packaging bag according to any one of claims 1 to 3, wherein after the cooling seal, the peripheral edge of the opening is further ultrasonically sealed using an ultrasonic seal member.   5. The packaging bag sealing method according to claim 4, wherein the ultrasonic sealing is performed using an ultrasonic sealing member provided so as to form a mesh-shaped ultrasonic sealing portion.   The ultrasonic sealing is performed by using an ultrasonic seal member provided so as to form an ultrasonic seal portion that is oblique to the extending direction of the cooling seal portion. A method for sealing a packaging bag according to 1.   A packaging bag, which is filled with contents, and whose opening is sealed by the packaging bag sealing method according to any one of claims 1 to 6. A sealing device used for sealing an opening of a packaging bag filled with contents,
A heat sealing member formed so as to have irregularities on the surface abutting on the packaging film, and the concave portion is continuous in at least a direction intersecting with the extending direction of the peripheral edge portion of the opening;
A cooling seal member provided so as to form a plurality of cooling seal portions by performing strong sealing while cooling along the extending direction of the peripheral edge portion of the opening after the heat sealing by the heat sealing member; A packaging bag sealing device comprising:   The packaging bag sealing device according to claim 8, further comprising an ultrasonic sealing member provided so that an ultrasonic sealing portion can be formed after the cooling sealing by the cooling sealing member.   A bag making apparatus comprising the packaging bag sealing apparatus according to claim 8.

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