WO2007132791A1

WO2007132791A1 - Packaging bag

Info

Publication number: WO2007132791A1
Application number: PCT/JP2007/059785
Authority: WO
Inventors: Katsunori Futase; Yukihiko Kamada; Kaori Nakajima
Original assignee: Taisei Lamick Co., Ltd.
Priority date: 2006-05-12
Filing date: 2007-05-01
Publication date: 2007-11-22
Also published as: JP2007326642A; JP4152417B2

Abstract

A soft packaging bag having a spout, where, at the beginning of pouring of a packaged object from the bag by tilting the bag by little and little and while adjusting the flow rate of the object, the object is unlikely to drop along that side edge of the bag which is located under the spout. The packaging bag has a tearing guide portion for forming the spout. A water repellent layer is provided on the outer surface of a side that is to be positioned at least under the spout in an attitude where the object is poured.

Description

Description Documents related to packaging bags

This application claims priority from Japanese Patent Application No. 2 0 06-2 5 7 5 7 3 filed on September 2nd, 2000. Technical field

The present invention relates to a soft packaging bag suitable for use as a packaging bag for liquid luncheons, soups, dressings and the like for lunch boxes and other relatively small sizes. In the present invention, when the packaging bag is tilted slightly while the dispensing amount is adjusted at the beginning of the dispensing of the packaged material from the opened packaging bag, It proposes a technique that is effective in preventing undesired passage along the side portion that will be located below the spout. Background art

As a relatively small and soft packaging bag for soy sauce, which is attached to lunch boxes, etc., in order to facilitate the opening of the soy sauce and to facilitate the precise dispensing of soy sauce to a predetermined location, What provided the narrow pouring path called a bottle mouth is used widely. According to this, the V-notch, I-node provided in the heat-sealed part that contributes to the formation of the narrow pouring channel.

I

A tear guiding portion made of a nail or the like can easily form a spout in its spout path by tearing with fingers.

However, such conventional packaging bags have the following problems when the packaged items have a low viscosity such as soy sauce. In other words, in order to prevent the packaged product from being applied to the food product, in many cases, when the packaging bag having a square planar shape is tilted little by little and poured out, the packaged product is formed with the tilted posture of the packaging bag. Height above the outlet The level may be low, that is, it may be dripped onto unintended parts through the side part that will be located below it, and sometimes the clothes may be soiled by the package. .

The object of the present invention is to incline the packaging bag by adjusting the flow rate by tilting the packaging bag little by little at the beginning of the dispensing of the packaging material from the packaging bag provided with a spout. The object of the present invention is to provide a packaging bag in which the packaged item is not likely to travel along the edge that will be located below the spout. Disclosure of the invention

The present invention relates to a soft packaging bag having a tear guide for forming a spout for a packaged article, and is positioned at least on the lower side of the spout in a pouring posture of the packaged article. We propose a packaging bag with a water-repellent layer on the outer surface of the side.

In the present invention, the water-repellent layer is preferably formed by a silicone-based, fluororesin-based, acrylic-based or amide-based coating agent.

Moreover, in this invention, it is a preferable structure that the said tearing induction part is formed in the heat seal part which contributes to formation of the narrow width | variety extraction path in which a spout is formed.

In the present invention, the tear guide portion may extend toward one end portion of the folded side of the packaging film that is not sealed in a packed and packed state of the article to be packaged. This is a preferred configuration.

In the present invention, the heat seal part that contributes to the formation of the narrow discharge path is a wide seal part, and the tear guide part extending from the side edge of the wide seal part to the narrow discharge path is provided on the wide seal part. It is a preferable configuration that it is provided.

Further, in the present invention, the tear guide portion is provided to extend in a curved shape or a straight shape from the seal side edge of the central portion in the length direction of the wide seal portion to the narrow pouring path. It is a preferable structure. In the present invention, it is preferable that the clearance between the starting end of the tear guide portion and the side edge of the heat seal portion contributing to the formation of the narrow pouring path is 0.3 to 0.

Further, in the present invention, it is preferable that at least a pair of projecting portions are provided on the start end side of the tear guiding portion, with the guiding portion being spaced apart and projecting to either the front or back of the heat seal portion. It is a configuration.

Further, in the present invention, it is preferable that a pair of mouthlet seal portions is provided at a position on the upper end of the heat seal portion at a position separating the tear guide portion.

In the present invention, it is preferable that the tear guiding portion is formed by a perforated hole or a continuous or intermittent melting mark. Brief Description of Drawings

FIG. 1 is a plan view showing an embodiment of the present invention.

Fig. 2 is a partially developed plan view of the packaging film.

FIG. 3 is a plan view showing another embodiment of the packaging bag according to the present invention.

FIG. 4 is a plan view showing another embodiment of the packaging bag according to the present invention.

FIG. 5 is a partially developed plan view of the packaging film.

FIG. 6 is a plan view showing a continuous packaging state of the packaging bag of the present invention.

FIG. 7 is a cross-sectional view schematically showing a tear guiding portion composed of perforated holes. FIG. 8 is a cross-sectional view schematically showing a tear guiding portion made of a melting mark.

FIG. 9 shows the operation of the packaging bag.

FIG. 10 is a view showing a dispensing form when the packaging bag is largely tilted.

FIG. 11A is a plan view showing an embodiment in the case where a protrusion is formed on the packaging bag of the present invention, and FIG. 11B is a plan view showing an embodiment in the case where a knurled seal portion is formed.

FIG. 12 is a diagram illustrating the tilt angle measuring apparatus according to the embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

The packaging bag according to the present invention has a water-repellent surface on the outer surface of the side portion that is positioned below the spout when the packaged item is poured out regardless of the opening width of the spout formed. A layer is provided.

As a result, in the present invention, the liquid repellent property of the package is improved by the water repellent layer provided on the outer surface, and when the package is gradually poured out from the spout, the packaging bag is tilted little by little. Wetting of the side portion that will be located below the spout is sufficiently prevented from being wrapped. Therefore, according to the present invention, it is possible to provide a packaging bag that is not likely to be transferred to an unintended portion of the packaged item.

In the present invention, the contact angle between the water-repellent layer and the packaged object, for example, soy sauce, is preferably in the range of 100 to 170 °, and in particular, the water-repellent layer is made of silicone, It is preferably formed by applying a fluororesin-based, acrylic-based or amide-based coating agent. As a result, the soy sauce can be accurately dispensed without the risk of the soy sauce wrapping around the spout.

Such a water-repellent layer can be formed on a packaging film used in the manufacture of a packaging bag, and the formation efficiency of the water-repellent layer can be greatly increased as compared to the case where it is formed on each individual packaging bag. it can. However, when a water-repellent layer is formed on a packaging film, the formed water-repellent layer is peeled off, worn, or abraded by subsequent heat-sealing processing and handling of the packaging film. May not be fully utilized. Therefore, in the present invention, when the coating agent is applied to the packaging film, urethane-based, acrylic-based, ester-based, nitrified cotton-based, amide-based, vinyl chloride-based, rubber-based, styrene-based, olefin-based, and hydrochloric acid-pi-based It is preferable to use a cellulose-based or phenol-based resin as a binder to increase the adhesion strength of the water-repellent layer to the packaging film.

It should be noted that in such a packaging bag of the present invention, at least one of the one or two heat seal portions that contributes to the formation of a narrow outlet passage in which a spout is formed is invited to tear. When the guiding portion is provided, the required spout can be easily formed by simply tearing the packaging bag to the extent that it completely crosses the narrow-width pouring path through the tear guiding portion. That is, such a packaging bag can easily form an appropriate spout as compared to a case where the spout is formed by tearing over the entire width of the packaging bag. In addition, the packaged item can be poured out more accurately at a predetermined location in the same manner as a conventional bottle-mouth packaging bag.

By the way, the tear induction part as described above is formed in the heat seal part of the square packaging bag which is in a so-called three-side seal, four-side seal form, etc. in the filled and packed state of the packaged item. Narrow width provided in the extending direction of the folded side of the packaging film that is not heat-sealed, such as a bag with a center-gap seal shape, etc. It can also be formed toward the extraction path. In this case, the spout formed in the narrow-width pour channel by the progress of tearing over the bow I tear-inducing portion has a transverse cross-sectional shape of the narrow pour-out channel due to the springback of the folded side of the packaging film. It expands in the form of drops and can secure a sufficiently large cross-sectional area of the extraction channel. Furthermore, since the pouring path is narrow, the packaged material is poured in a certain direction along the pouring path by pressing the filling space. Can be poured out. Therefore, unlike the conventional case, the packaged items are not scattered when being poured out, and fingers and clothing are not soiled.

In other words, when a narrow-poured channel is formed between a pair of heat-sealed parts as in a conventional packaging bag, even if a spout is formed in the narrow-poured channel, the narrow-width channel is still used. The exit channel still has a flat cross-sectional shape, and the exit channel cross-sectional area also remains small without an increase in the output channel pressure. For this reason, with a conventional packaging bag, it is difficult to smoothly pour out the packaged material at the beginning. On the other hand, if the filling space of the packaged product is pressed with a finger to perform a sufficient amount of initial dispensing, However, the momentum was too strong, and there was a problem that a large amount of the packaged material was poured out to the part other than the predetermined part.

And also, the folded side of the packaging film that is not heat sealed For example, a heat seal part consisting of a horizontal seal part or a vertical seal part that contributes to the formation of a narrow pouring channel is about 2 to 3 times as wide as other heat seal parts. A wide seal portion is preferable. By making the wide seal portion in this way, the wide seal portion is bounded by the curved or linear tearing guide portion extending from the side edge of the wide seal portion to the narrow discharge passage. It can be gripped with fingers. As a result, tearing and unsealing of the packaging bag over the tear guiding portion can be performed easily and always properly without unintentional pressing of the packaging bag against the package filling space.

Here, the tear guiding portion provided in the wide seal portion is extended in a curved, curved or detoured manner from the seal top edge of the central portion in the length direction of the wide seal portion to the narrow outlet passage. When provided, it is possible to secure an optimum gripping space for tearing the packaging bag on each side of the tear guiding portion, and at the same time, to ensure smooth progress of tearing and unexpected breakage be able to.

In addition, the clearance between the starting end of the tear guiding portion and the side edge of the heat seal portion that contributes to the formation of the narrow pouring path is preferably 0.3 to 1.0 mm. During handling of the bag, the tear guide does not break unexpectedly and there is no risk of leakage of the contents to be wrapped.

Furthermore, it is preferable to provide at least one pair of protrusions or a pair of knurled seal portions on each side portion of the guide portion on the start end side of the tear guide portion. The tear guiding portion thus configured does not slip the fingers due to the protrusion or the low-let seal portion, and can smoothly progress the tearing, and can detect the opening position with a tactile sense. .

The tear guiding portion is preferably formed by perforated holes or melt marks melted continuously or intermittently by a laser beam or the like. This is because when the tear guiding portion is formed over a required length on the wide seal portion or the like, it is easy to form and the tearing of the packaging bag can proceed smoothly. is there. Hereinafter, the packaging bag of this invention is demonstrated using figures.

FIG. 1 is a plan view showing an embodiment of the present invention in the form of a package for packaging. The packaging bag shown in Fig. 1 is a three-side seal type packaging film made up of laminated films. The free end portion of the packaging film, which is folded in half in the center in the width direction, forms a vertical seal portion 2 as shown by hatching in the figure by a heat seal. Further, the horizontal seal portions 3a and 3b, which are also indicated by hatching in the figure, are formed at predetermined intervals in the length direction of the packaging film, so that the space for filling the packaged material 4 Is formed. The narrow discharge passage 5 is formed by a vertical seal portion 2 and a wide horizontal seal portion 3a.

In addition, this packaging bag is provided with a V-notch 6 as an example at the position corresponding to the upper edge of the narrow pouring channel 5 in the figure on the outer edge of the vertical seal portion 2. From this V-notch 6, the packaging bag 1 can be easily Can be torn and opened with fingers, in other words, a spout can be formed into the narrow outlet 5.

And this packaging bag 1 is wider than the vertical seal part 2 and covers the entire width of the narrow pouring channel 5 on both outer surfaces of the vertical seal part 2 as shown in the figure for example. A water repellent layer 7 is provided as described above. Thus, in the packaging bag 1, the water-repellent layer 7 is provided with a wide width, so that the packaged material is transferred along the side of the vertical seal portion regardless of the manner in which the packaged product is poured out. Can be sufficiently prevented. The width of the water-repellent layer 7 can be made narrower. For example, the width of the water-repellent layer 7 can be made equal to the width of the vertical seal portion 2 or the left side of the vertical seal portion 2 in the figure. It can also cover only the edges.

This water repellent layer 7 can of course be formed on each individual packaging bag 1 or a packaging film after the vertical seal portion 2 is provided, but considering the forming efficiency of the water repellent layer 7, It is preferable to carry out at the stage of the film for the film, or the stage before the lamination of the packaging film which is often laminated.

By the way, such a water repellent layer 7 is, for example, a silicone type, a fluororesin type, It can be formed by applying an acrylic or amide coating agent on the surface of the packaging film, or it can be coated by printing or spraying, and the coating agent can be applied to the packaging film material itself. For example, it can be formed by kneading in extrusion molding, injection molding, blow molding or the like, or by subjecting the film surface to plasma treatment.

Fig. 2 is a partially developed plan view of the packaging film. Here, a water-repellent layer 7 having a predetermined width is formed on both sides of a packaging film 21 that is folded in the width direction and made into a bag on both sides where a vertical seal is applied, as shown in the figure. Pre-formed with gravure coat and other means.

When forming the water-repellent layer 7 in the stage of the packaging film 21 or in the previous stage, in order to increase the adhesion strength of the water-repellent layer 7 to the film surface, the coating agent as described above is applied. It is preferable to use a resin such as urethane, acrylic, ester, nitrified cotton, amide, vinyl chloride, rubber, styrene, olefin, vinyl chloride, cellulose, or phenol as a binder.

FIG. 3 is a plan view showing another embodiment in a filled and packed form of an article to be packaged.

The horizontal seal portion 3 a of the packaging bag 1 is composed of a wide seal portion having a width approximately 2 to 3 times that of the other heat seal portions 2 and 3 13. The wide lateral seal portion 3a is not subjected to heat sealing, and the narrow pouring path 1 is provided at one end in the extending direction of the folded side 9 of the packaging film, in the figure, at the upper end. 0 is formed. In the horizontal seal portion 3a, the sewing machine extends in a curved shape that protrudes downward in the figure from the substantially central top portion in the length direction to the narrow-width pouring channel 10 in the figure. A tearing guide portion 11 is provided which is formed of holes that are perforated. Further, as shown in the figure by applying a mesh, the water-repellent layer 7 is formed along the folded side 9 with the same width as the maximum width of the narrow pouring channel 10. Note that the tear guide 11 may be provided in a straight line as shown in another embodiment of FIG.

By the way, the packaging bag 1 as shown in FIG. 3, for example, as shown in a partially developed plan view in FIG. 5, after forming the water-repellent layer 7 in a band shape in advance in the central region of the width of the packaging film 21, It can be manufactured by folding in half in the width direction and applying a continuous vertical seal to the free end portion of the film 21 and applying each horizontal seal while filling the package.

As shown in FIGS. 3 and 4, the tear guiding portion 11 is formed at a position where the starting end is located at the center top of the wide lateral seal portion 3a and is separated from the side edge. During handling of the packaging bag 1, the leading end of the guiding portion 1 1 is not caught or broken by a member, etc., and there is no possibility of the packaged material leaking unexpectedly. The effect is even more effective when the clearance between the starting end of the tear guiding portion 11 and the top edge of the lateral seal portion 3a is 0.3 to "! Omni. It is effective to prevent the guide part 11 from being unexpectedly broken when the continuous packaging bags are separated one by one through the perforation or every several required bags. If the clearance is smaller than 0.3raii, the above effect cannot be obtained. If the clearance is larger than 1.0mm, it is difficult to open with fingers, which is not preferable.

In addition, the packaging bag of the present invention is such that, even in the state of a continuous packaging bag as shown in FIG. 6, the starting end of the tear guiding portion 11 is not caught by a roll or the like during automatic filling and packaging. It is harder to bend than the guide part formed in a horizontal line from the seal part 2, and there is no possibility of tearing during movement.

By the way, the tear guiding portion 11 consisting of a perforated hole is penetrated in a perforated shape after forming a wide lateral seal portion 3 a as schematically illustrated in the sectional view of FIG. 7A. It can be formed by drilling holes 1 1 a. In addition, as schematically illustrated in FIG. 7B, the tear guide portion 11 is in the state of the packaging film 21 and has two perforated holes 1 1 b in advance at the two overlapping positions. It can also be formed by embedding the pores of the Silang soot layer that are fused together by the formation of the lateral seal portion 3a after that, and burying them with the melted Sealan soot layer itself. .

FIG. 8 is a cross-sectional view schematically showing another example of forming the bow I tear guiding portion 11. This is because before or after the formation of the wide horizontal seal 3a, For example, a base film is melted, evaporated, sublimated, etc., continuously (Fig. 8A) or intermittently (Fig. 8B) of a packaging film 21 that has a laminated structure by irradiation with a laser beam such as Such melting marks are formed at positions corresponding to each other on the front and back surfaces of the horizontal seal portion 3a.

Such a tear guiding portion 11 1 enables easy and smooth tearing with the fingers of the lateral seal portion 3 a regardless of whether the tear guiding portion 11 is in FIG. 8A or FIG. 8B. Furthermore, the passage of the tear guide portion 1 1 to the narrow-poured channel 10 is also made smooth enough to form the spout as expected to the narrow-poured channel 1 You can be sure.

In the case of the packaging bag 1 having the form as shown in FIGS. 3 and 4, when forming the spout in the narrow-width outlet 10, the wide lateral seal portion 3 a surrounding the tear guide portion 1 1 is torn. When starting from the top edge side, grip the horizontal seal portion 3 a with the left and right fingers at the tear guide portion 11 as a boundary. For this reason, it is preferable that the tear guiding portion 11 is formed so that a sufficient holding space is provided by the left and right fingers in the lateral seal portion 3a without reaching the filling space 4 of the packaged item.

The operation of the packaging bag as described above will be described below using the packaging bag 1 in FIG. 3 as an example. In this case, the opening of the packaging bag 1, that is, the formation of the spout into the narrow outlet 10, is carried out by holding the wide horizontal seal portion 3 a with the left and right fingers, and the seal portion 3 a being the tearing guide portion. It can be done by tearing 1 1 and tearing it across the narrow pouring channel 10.

As illustrated in Fig. 9A, the narrow-width dispensing path 10 formed in the folded portion of the packaging film 21 is greatly opened in the form of droplets, which makes the sufficiently wide narrow width. A passage cross-sectional area and a spout cross-sectional area can be secured. For this reason, the package contents are always smoothly poured out from the spout 1 2 by the tilting operation of the wrapping bag 1 as shown in Fig. 9B without being affected by the dimensions of the spout. .

Conventionally, as shown in Fig. 9B, when the packaging bag is tilted little by little while adjusting the amount to be dispensed, the packaged item is based on this tilting operation of the packaging bag. In this case, it will flow down the side part that will be located below the spout of the packaging bag, the folded side 9 in the figure, and flow down as illustrated by the phantom line in the figure. On the other hand, in the packaging bag according to the present invention, the action of the water repellent layer 7 sufficiently prevents the folded side 9 from being wetted by the packaged object. For this reason, as shown by the solid line in the figure, the packaged material flows down directly under the spout 12 due to high fluidity or water repellency, and there is no risk of dripping onto the unintended part of the packaged product.

Here, as illustrated in FIG. 10, when the amount of tilting of the packaging bag 1 is large and the folded side 9 is positioned above the spout 12, the water repellent layer 7 Without waiting for the action, it is possible to sufficiently prevent the packaged material from flowing down to an unintended location.

Further, in the present invention, as shown in FIG. 11, the protrusion 13 (FIG. 11 A) or the low seal seal 14 (FIG. 11 B) is provided at a position spaced apart from the tear guide 11. Are preferably provided in pairs. This protruding part 1 3 or mouthlet seal part 14 has a wide lateral seal part 3 a that is gripped with both fingers with the tear guide part 1 1 as a boundary, and uses the leverage to make the lateral seal part 3 a Leading part at the upper end 1 1 When tearing and unsealing from the beginning, it is possible to prevent the fingers from slipping, and the tearing guiding part 1 1 can be detected by tactile sense. However, the position can be easily and quickly found.

Therefore, the protruding part 1 3 or the mouthlet seal part 1 4 is located on the wide lateral seal part 3 a with respect to both sides of the gripping position with both fingers, that is, the tear guide part 1 1 near the start end. Provided. Plural protrusions 13 may be formed in pairs on both sides of the tear guiding part 11, and the size of the knurled seal part 14 is at least large enough to be grasped by fingers, for example, 10 countries It should be about (horizontal seal part length direction) x 5 mm (horizontal seal part width direction).

The protrusions 13 can have various shapes such as a circle, a triangle, a quadrangle, and a polygon. The forming method is as follows: on the surface of one heat seal blade of the horizontal heat seal roll for forming the horizontal seal portion 3a, a pair of concave portions having the above-mentioned shape, By providing a convex portion at a position corresponding to the concave portion on the surface of the other heat seal blade, with an interval in the film width direction, the packaging film that has passed between both heat seal blades The protrusions 13 are formed simultaneously with the formation of the lateral seal portion 3a. Similarly, the knurled seal portion 14 is also formed without adding a special process by forming a knurled rough surface on each surface of the pair of horizontal heat seal blades. be able to.

(Example)

With respect to the packaging bag of the present invention, the effect of the presence or absence of a water-repellent layer on the liquid drainage of the packaged goods was examined.

15 Three-dimensional seal of a 5 jt / m-thick biaxially stretched nylon base film and a 50 jtm-thick linear aperture-polyethylene sealant layer allows the outer dimensions to be 90 A x55mm (inner dimension: 62mm x 50mm) packaging bag was made, and a narrow outlet was formed to form a spout for the package on the folded side of the packaging bag. The outlet diameter was set to 4 mm.

In addition, two types of packaging bags were prepared, one with a silicone water-repellent layer along the folded side (Example) and one without a water-repellent layer (Comparative Example). In addition, 11.0 g of Koikuchi soy sauce (Kikkoman Co., Ltd.) was enclosed as the package.

First, fix the above two types of packaging bags to the tilt angle measuring device shown in Fig. 12 with the spout opened, and gradually tilt it at 50mm / min. The angle at which pouring was started was measured. The results are shown in Table 1.

Next, the packaging bag is fixed at an arbitrary angle using the same device as described above, and the packaging bag is pressed at that angle to pour out the package, and the package is aligned along the edge of the packaging bag. The angle () was measured. The results are shown in Table 1.

From the results in Table 1, the dispensing start angle is affected by the presence or absence of a water-repellent layer. There wasn't. On the other hand, with regard to liquid dripping, in the comparative example, liquid dripping occurred at the pouring start angle of the packaged object, whereas in the example, due to the presence of the water repellent layer, the packaged object was poured out. The dripping was suppressed to a state where the tilt angle was tighter (smaller) than the start angle.

(table 1 )

Industrial applicability

The liquid packaging bag according to the present invention contains soy sauce, sauce, various seasonings, soups, fruit juices, liquid or viscous foods, detergents, pharmaceuticals, etc. It can be used as a packaging bag used for packaging.

Claims

1. A soft packaging bag having a tear-inducing portion for forming a spout for a package,

A packaging bag in which a water-repellent layer is provided on the outer surface of at least the side portion that will be positioned below the spout in the pouring posture of the package. Mouth

2. The packaging bag according to claim 1, wherein the water repellent layer is formed by a silicone-based, fluororesin-based, acrylic-based or amide-based coating agent.

of

3. The packaging bag according to claim 1, wherein the tear guide portion is formed in a heat seal portion that contributes to formation of a narrow-width pouring path in which a spout is formed.

4. The tear guide portion is formed toward a narrow pouring path formed in the extending direction of the folded side of the packaging film, which is not heat-sealed in the packaged state of the package. The packaging bag according to claim 1, wherein:

5. The heat seal portion that contributes to the formation of the narrow dispensing path is a wide sealing section, and the wide sealing section is provided with a tear guiding section extending from the side edge thereof to the narrow dispensing path. The packaging bag according to claim 3, wherein

6. The tear guiding portion is provided to extend in a curved line or a straight line from a seal side edge of a central portion in a length direction of the wide seal portion to a narrow pouring path. The packaging bag according to claim 5, which is a bag.

7. The clearance between the starting edge of the tear guiding portion and the side edge of the heat seal portion that contributes to the formation of the narrow pouring channel is 0.3 to 1, 0. The packaging bag described.

8. At least a pair of protrusions are provided on the start end side of the tearing guide portion, spaced apart from the guide portion, and projecting to either the front or back of the heat seal portion. The packaging bag according to 3.

9. The packaging bag according to claim 3, wherein a pair of knurls and a seal part are provided at a position on the upper end of the heat seal part with a tear guide part therebetween.

10. The packaging bag according to claim 1, wherein the tear guiding portion is formed by a perforated hole or a continuous or intermittent melting mark.