JP2020006993A - Standing pouch with steam-venting mechanism and method for manufacturing same - Google Patents

Abstract

To provide a standing pouch with a seam-venting mechanism, which can reduce reduction of the sealing strength of a side caused by biting-in of a content or the like.SOLUTION: A standing pouch (1) is formed by using a laminate having a sealant layer as a base material for a plastic film, formed into a bag shape having a trunk including a front trunk (11) and a rear trunk (12) and a bottom part (14), can stand alone having a storage part (7) therein with the bottom part as a lower side, and comprises: a steam-venting mechanism (18) provided to the upper end of the trunk; and side seals (16, 17) that connect the front trunk and the rear trunk, and a plurality of recessed and projected parts are regularly arrayed in a thickness direction on at least one surface of the front or rear trunk of the side seals.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a standing pouch with a steam release mechanism and a method for manufacturing a standing pouch with a steam release mechanism.

  BACKGROUND ART Conventionally, various packaging bags for packaging food are known. For example, Patent Literature 1 discloses a pouch (standing pouch) that can stand alone in a state in which contents are stored and can be heated by a microwave oven. The pouch disclosed in Patent Literature 1 has a body portion and a bottom portion that are heat-sealed, an opening serving as a filling port is formed in the top side, and has a steam release mechanism for releasing water vapor generated from food during heating to the outside of the pouch. Has at the top. When the pouch described in Patent Literature 1 is heated, part of the moisture in the food in the pouch evaporates and the pressure of steam generated by evaporation causes a part of the heat sealing part of the part of the steam release mechanism to peel off and open. The inside and outside of the pouch are communicated with each other so that steam can be discharged from the opening.

  On the other hand, when a steam venting mechanism is provided on the top side as in the standing pouch described in Patent Document 2, it is preferable in terms of manufacturing process to form the steam venting mechanism before the step of storing the contents. For this reason, unlike the configuration disclosed in Patent Document 1 in which the contents are filled from the top side of the pouch, the left and right side portions are filled so that the contents can be filled from either of the left and right sides. There is known a standing pouch having a configuration in which a filling port is formed by forming a bag without sealing either side of the container and the filling port is sealed after filling the contents.

  In a standing pouch of a form that is filled from the side as disclosed in Patent Document 2, as a problem when sealing the filling port after filling the contents in the standing pouch, It has been pointed out that a decrease in seal strength due to biting of contents or the like has occurred. When the standing pouch is heated by a microwave oven or the like with the contents filled, and the internal pressure is increased by the steam generated by the heating, the steam venting mechanism is opened before the internal pressure becomes too high, and the steam escapes. . However, when the sealing strength of the side seal portion is insufficient in the standing pouch with the steam release mechanism, for example, before the steam release mechanism is opened, the side seal portion is broken by the internal pressure, and the contents are lost. There is a risk of spouting.

  Similarly, in the case of a standing pouch in which the filling port is the top side, the contents may be similarly bitten and the sealing strength of the top section may be reduced. However, in general, a standing pouch is not filled with contents near the top. For this reason, even if a breakage occurs, there is little danger that the contents will be spouted just by spouting water vapor, and it is the same as when the steam venting mechanism is opened. . On the other hand, when the side portion is used as the filling port, there is a high possibility that the contents are spouted out, and the decrease in the sealing strength due to the biting of the contents is a bigger problem.

JP 2015-120550 A JP 2017-24746 A

  SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and in a standing pouch with a steam venting mechanism provided with a filling port on the side, a side seal is formed by biting the contents. An object of the present invention is to provide a standing pouch with a steam venting mechanism, in which the strength hardly decreases.

  In order to solve the above problems, the invention according to claim 1 of the present invention is formed by using a laminate having a sealant layer as a base material of a plastic film, and includes a trunk including a front trunk and a rear trunk. A standing pouch having a bottom and a bag-like shape, having a storage portion therein and having the bottom portion as a lower side and being self-supporting, a steam venting mechanism provided at an upper end portion of the body portion, And a side seal portion connecting the front body portion and the rear body portion, and irregularities in a thickness direction are regularly formed on at least one surface of the front body portion or the rear body portion of the side seal portion. It is a standing pouch with a steam venting mechanism characterized by being arranged in a plurality.

  Further, the invention according to claim 2 of the present invention is characterized in that the planar shape of the projections of the unevenness is rectangular, and at least one side of the projections arranged on the storage section side of the side seal portion on the storage section side. Are arranged along one straight line, and the standing pouch with a steam venting mechanism according to claim 1, characterized in that:

  Also, the invention according to claim 3 of the present invention is characterized in that a row of planar shapes located on the side of the storage portion of the side seal portion of the projections of the unevenness is a triangle, and one side of the triangle is the storage portion. The standing pouch with a steam venting mechanism according to claim 1, wherein the standing pouch is arranged along one straight line facing the side.

  Further, in the invention according to claim 4 of the present invention, the steam venting mechanism includes a steam port seal portion provided at an upper end portion of the body, and a steam port seal portion provided in an area where the steam port seal portion is provided. The steaming port guiding part formed by cutting a body part in the thickness direction of the laminated body, and is formed, The standing with a steam venting mechanism according to any one of claims 1 to 3 characterized by things. It is a pouch.

  The invention according to claim 5 of the present invention is characterized in that a body including a front body and a back body and a bottom are formed by a laminate having a sealant layer as a base material of a plastic film. It is a manufacturing method of a standing pouch with a steam venting mechanism having a bag-like shape with one side opened, having a storage portion inside and being capable of standing independently with the bottom portion as a lower side, wherein an upper end portion of the body portion is provided. A steam venting mechanism is provided, and both sides of the front body and the rear body are used as side seals, one of the side seals is connected by ultrasonic sealing, and the other is sealed with the contents. As an opening to be filled, the contents are sealed by ultrasonic sealing after filling, and a plurality of irregularities in the thickness direction are regularly arranged on at least one surface of the front trunk or the rear trunk of the side seal part. And the plurality of irregularities arranged Housing portion side is the method for producing a venting mechanism with standing pouches, and forming as to be arranged along a straight line one.

  According to the invention described in claim 1 of the present invention, in a standing pouch having a steam venting mechanism, the irregularities are regularly arranged on the side seal portion, so that the content is provided from one of the side seal portions. Even if the contents are caught when sealing after filling, the contents can flow due to the unevenness and can be taken into the projections, so a standing pouch with a steam venting mechanism that does not easily reduce the seal strength Can be provided.

  According to the second aspect of the present invention, the storage portion side of the side seal portion has a shape in which one side of the rectangle is arranged along one straight line. With this configuration, it is possible to reduce the portion where stress is concentrated when the internal pressure is increased due to water vapor generated when filling the contents in the standing pouch and heating it with a microwave oven or the like, and the side seal portion is reduced from the portion where the stress is concentrated. It is possible to provide a standing pouch with a steam release mechanism that can eliminate the possibility of peeling and maintain the sealing strength of the side seal portion.

  According to the third aspect of the present invention, even when the irregularities are arranged so that the rectangles are obliquely arranged in a diagonal direction, one side of the triangle is formed on the side of the side seal part on the side of the storage part with the convex part on the side of the storage part being a triangle. It has a shape arranged along a straight line of a book. With this configuration, it is possible to reduce a portion where stress is concentrated at the time of heating, eliminate a possibility that the side seal portion is peeled off from the portion where the stress is concentrated, and provide a standing pouch with a steam release mechanism that can maintain the seal strength of the side seal portion. it can.

  According to the fourth aspect of the present invention, a standing pouch with a steam venting mechanism having a relatively simple structure and provided with a portion where pressure is concentrated can be provided.

  According to the invention as set forth in claim 5, by forming the side seal portion by regularly arranging a plurality of concaves and convexes by the ultrasonic sealing method with high working efficiency, the side seal portion which is difficult to bite the contents is formed. The storage portion side of the side seal portion can be formed so that a plurality of irregularities are arranged along one straight line. With this configuration, it is possible to manufacture a standing pouch with a steam venting mechanism in which the seal strength of the side seal portion is not easily reduced and the side seal portion is less likely to peel off due to concentration of stress.

It is a front view of the standing pouch with a steam release mechanism of one embodiment of the present invention. It is a schematic diagram which shows the structure of the laminated body of the standing pouch with a steam release mechanism of one Embodiment of this invention. It is sectional drawing in the XX 'line | wire of FIG. 1, Comprising: It is sectional drawing of the side seal part of the standing pouch with a steam release mechanism of this invention. It is a top view of the side seal part in which one side of the convex part located in the storage part side is arranged along one straight line. It is a top view of the side seal part in which one row of the convex part located in a storage part side is triangular, respectively. It is a top view of the side seal part explaining the dispersion | variation of the position from one straight line of one side of the convex part located in the storage part side. It is a top view of a side seal part explaining inclination from one straight line of one side of a convex part located in a storage part side. It is a top view of the side seal part in which the convex parts located in the storage part side are arranged in a saw-tooth shape. It is an enlarged front view which shows the other example of a structure of the steam-flow opening guidance part in the standing pouch of one Embodiment. It is an enlarged front view which shows the other example of a structure of the steam-flow opening guidance part in the standing pouch of one Embodiment. It is an enlarged front view which shows the other example of a structure of the steam-flow opening guidance part in the standing pouch of one Embodiment. It is an enlarged front view which shows the other example of a structure of the steam-flow opening guidance part in the standing pouch of one Embodiment. It is an enlarged front view which shows the other example of a structure of the steam-flow opening guidance part in the standing pouch of one Embodiment. It is an enlarged front view which shows the other example of a structure of the steam-flow opening guidance part in the standing pouch of one Embodiment. It is an enlarged front view which shows the other example of a structure of the steam-flow opening guidance part in the standing pouch of one Embodiment. It is an enlarged front view which shows the other example of a structure of the steam-flow opening guidance part in the standing pouch of one Embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments.

  FIG. 1 is a front view of a standing pouch with a steam venting mechanism (hereinafter, may be simply referred to as “standing pouch”) according to the present embodiment. FIG. 2 is a schematic diagram illustrating a configuration of a stacked body of a standing pouch with a steam release mechanism. The standing pouch 1 shown in FIG. 1 can be heated and cooked in a microwave oven in a state where the contents are stored in the storage section 7 of the standing pouch 1 and maintain independence in the microwave oven. Can be.

  As shown in FIG. 2, the standing pouch 1 according to the present embodiment is formed by a laminate 1A in which a sealant 2, an intermediate resin film 4, and a barrier film 6 are laminated, and has a storage section 7 inside. . The sealant 2 and the intermediate resin film 4 are adhered by, for example, a urethane-based adhesive 3. The intermediate resin film 4 and the barrier film 6 are bonded by, for example, a urethane-based adhesive 5.

  The sealant 2 forms the inner surface of the standing pouch 1. The sealant 2 is made of a polymer resin composition. In the sealant 2 of the present embodiment, at least the inner surface side of the standing pouch 1 functions as a sealant layer that can be joined to each other by heat sealing. The sealant 2 may have a configuration in which a resin that cannot be joined by heat sealing is used as a base material, and a heat sealable resin layer is provided on the base material. As the sealant 2, for example, a polyolefin resin such as undrawn polypropylene (CPP), low-density polyethylene, medium-density polyethylene, and linear low-density polyethylene can be used.

  The intermediate resin film 4 is a resin film that imparts puncture resistance to the standing pouch 1, and can be provided on the laminate 1A as appropriate as needed. The intermediate resin film 4 is made of, for example, biaxially stretched nylon (ONY).

  The barrier film 6 is a resin film in which a barrier layer is laminated on a base film such as polyethylene terephthalate and has a function of reducing the transmission of gas such as water vapor and oxygen. The barrier layer is an organic barrier coat layer such as polyvinylidene chloride (PVDC) or polyvinyl alcohol (PVA), or an inorganic oxide layer such as aluminum oxide or silicon oxide. It is particularly preferable that an inorganic oxide layer is provided as a barrier layer from the viewpoint of high barrier properties and microwave transmission. Further, the barrier layer includes, on the inorganic oxide layer, a barrier coat layer containing a water-soluble polymer such as PVA and a metal oxide using a metal precursor by a sol-gel method, or a polycarboxylic acid-based polymer. A configuration in which a barrier coat layer is provided may be adopted, so that the barrier layer has excellent durability against bending and the like.

  Although not shown, the standing pouch 1 may further have a printed layer for design. The printing layer may be provided on the intermediate resin film 4 or the barrier film 6. The outermost resin film may be provided outside the barrier film 6 as a film different from the intermediate resin film 4 and the barrier film 6. In this case, a printing layer may be provided on the outermost resin film.

  The standing pouch 1 is formed by the above-mentioned laminated body 1A. The standing pouch 1 is formed by the rectangular body (the front body 11 and the rear body 12) constituting the front and rear surfaces of the standing pouch 1 and the above-described laminated body 1A, and forms the bottom of the standing pouch 1. It has a bottom portion 14 and is formed in a bag shape. The front trunk 11, the rear trunk 12, and the bottom 14 are all arranged such that the sealant 2 faces the storage part 7, which is the internal space of the standing pouch 1. The standing pouch 1 is formed by heat sealing at the portion where the front trunk portion 11, the rear trunk portion 12 and the bottom portion 14 are joined, and the portion where the top side portion 15 and the bottom portion 14 are joined by heat sealing. Have been.

  The front trunk 11 and the rear trunk 12 are joined (connected) by an ultrasonic seal at the left seal 16 and the right seal 17 (hereinafter, sometimes referred to as “side seal” without distinction). Have been. One of the left and right side seal portions (side portions) of the ultrasonic sealing portions of the body portions in the standing pouch 1 serves as an entrance for accommodating the contents inside the standing pouch 1 before the contents are accommodated. Are not joined to each other, but are joined by an ultrasonic seal after the contents are stored. A notch 13 may be formed at one or both of the left and right side seal portions of the joining portions of the body portions of the standing pouch 1 to cut and open the standing pouch 1 with fingers. When an ultrasonic seal is employed, the mechanism of the standing pouch 1 is not complicated, and cooling is not required. Therefore, the standing pouch 1 is suitable for continuous filling.

  The bottom portion 14 has a shape folded into the inside of the standing pouch 1. The bottom 14 is expandable by the contents contained in the standing pouch 1. In a state where the bottom portion 14 is expanded, the front trunk portion 11 and the rear trunk portion 12 are separated back and forth, and the standing pouch 1 is separated by the lower end of the front trunk portion 11 and the lower end of the rear trunk portion 12 in the separated state. A support structure for self-support is formed. In other words, the standing pouch 1 of the present embodiment can stand on its own such that the bottom portion 14 is on the lower side and the top portion 15 is on the upper side. The bottom 14 is not limited to a form in which a continuous laminate is folded inside as illustrated in FIG. The bottom portion 14 includes, for example, a front body portion 11, a rear body portion 12, and a bottom portion 14 which are separate bodies, and a bottom portion 14 formed of a laminate folded in an inverted V-shape. 12 may be sandwiched between them and heat-sealed at their respective edges.

  Further, at the upper end of the standing pouch 1, there is formed a steam venting mechanism 18 for discharging steam generated by heating the contents accommodated inside the standing pouch 1 to the outside of the standing pouch 1. At least one steam release mechanism 18 is provided in the direction in which the top edge 15 of the standing pouch 1 extends. The steam venting mechanism 18 has a steam passage opening seal portion 18A extending from the upper end side of the standing pouch 1 toward the lower end, and a steam passage opening guide portion 18B formed on the steam passage opening seal portion 18A.

  The steam passage opening seal portion 18A extends downward from the upper end of the standing pouch 1 in a direction along the surfaces of the front trunk portion 11 and the rear trunk portion 12. In addition, the lower end of the steam port seal portion 18 </ b> A in the steam release mechanism 18 is located lower than the lower end of the seal portion of the top portion 15. Further, the lower end of the steam port seal portion 18A is located closer to the top portion 15 than the notch 13 in the vertical direction of the standing pouch 1. For this reason, when the standing pouch 1 is torn using the notch 13, the steam passage opening seal portion 18A does not interfere. The steam passage opening seal portion 18A can be formed by heat sealing simultaneously with the step of forming the seal portion of the top portion 15.

  The steam passage port guiding portion 18B is open at the upper end of the standing pouch 1 and extends toward the lower end of the standing pouch 1. Except for the upper end of the standing pouch 1 in the peripheral portion of the steam passage opening induction portion 18B, it is surrounded by a steam passage hole seal portion 18A. The shape of the steam passage opening guide portion 18B has a substantially U-shape having a contour shape that is wider at the upper end of the standing pouch 1 and gradually narrows toward the lower end, and becomes semicircular at the lower end. . The steam passage guide portion 18B can be formed by cutting the front body 11 and the rear body 12 in the thickness direction of the laminate 1A. In addition, it is preferable that the lower end of the steam passage guide portion 18B is located lower than the lower end of the sealing portion of the top portion 15.

(Modification)
A modification of the standing pouch 1 in the above embodiment will be described.
In this modified example, a plurality of configuration examples are shown for the shape of the steam passage port.

(Structural example 1 of the steam port)
FIG. 9 is an enlarged front view illustrating another example of the configuration of the steam passage port in the standing pouch 1.
As shown in FIG. 9, the steam passage port 50 of the present configuration example has an inverted triangular shape having a bottom at the upper end of the standing pouch 1 and a vertex at a lower end of the standing pouch 1. The steam port 50 of the present configuration example is not open at the upper end of the standing pouch 1, but is entirely surrounded by the heat-sealed laminate 1A.

(Structural example 2 of the steam port)
FIG. 10 is an enlarged front view illustrating another example of the configuration of the steam passage port in the standing pouch 1. As shown in FIG. 10, the steam passage port 51 of this configuration example has a circular shape in a front view. The steam passage port 51 of the present configuration example is not open at the upper end of the standing pouch 1 but is entirely surrounded by the heat-sealed laminate 1A.

(Example 3 of configuration of the steam port)
FIG. 11 is an enlarged front view showing another example of the configuration of the steam passage opening guiding section in the standing pouch 1.
As shown in FIG. 11, the steam passage opening guide portion 52 of the present configuration example is circular at the lower end and linearly extends to the upper end of the standing pouch 1. In the present configuration example, the line width of the linear portion 52a of the passage opening guiding portion 52 is smaller than the inner diameter of the circular portion 52b. The inner diameter of the circular portion of the vapor passage guiding portion 52 may be the same as in the above configuration example 2, and is, for example, 2 mm. In the present configuration example, when the internal pressure of the standing pouch 1 increases due to the heating cooking, the vicinity of the vapor passage induction portion 52 is easily deformed, so that the steam is easily released.

(Configuration example 4 of the steam port)
FIG. 12 to FIG. 15 are enlarged front views showing another example of the configuration of the steam-passing port inducing portion in the standing pouch 1.
As shown in FIG. 12, the steam passage opening guiding portion 53 of this configuration example has a V-shape in which the interval gradually increases toward the upper end of the standing pouch 1. The interval between the steam port induction sections 53 at the upper end of the steam port induction section 53 is 2 mm. Further, the height dimension of the steam passage opening guiding portion 53 in the vertical direction of the standing pouch 1 is, for example, 2 mm. The steam passage opening guidance part 53 of the present configuration example is formed by forming a notch that penetrates the laminated body 1A with, for example, a V-shaped cutting blade. For this reason, in this configuration, no scum is generated in the step of forming the steam passage port induction portion 53. For example, a U-shaped steam port guide section 53A (see FIG. 13), a J-shaped steam port guide section 53B (see FIG. 14), or a C-shaped steam port guide section 33C (see FIG. 15). May be formed on the standing pouch 1.

(Structural example 5 of the steam port)
FIG. 16 is an enlarged front view showing another example of the configuration of the steam passage opening guiding section in the standing pouch 1.
As shown in FIG. 16, the steam passage opening guiding section 54 of the present configuration example is J-shaped. Furthermore, the straight portion of the J-shaped steam passage opening guide portion 54 of the present configuration example extends until it reaches the upper end of the standing pouch 1. In the present configuration, as in the above-described configuration example 4, no scum is generated in the step of forming the steam passage guiding portion 54. Furthermore, in the present configuration example, similarly to the above configuration example 3, when the internal pressure of the standing pouch 1 increases due to heating and cooking, the vicinity of the vapor passage opening induction portion 54 is easily deformed, and thus steam is easily released.

  The operation of the steam release mechanism 18 will be briefly described. When heating and cooking of the contents is started with a microwave oven or the like in a state where the contents are stored in the standing pouch 1, a part of the moisture in the contents evaporates to become steam, and the standing pouch 1 expands. Further, when the internal pressure of the standing pouch 1 increases with the generation of water vapor, the left and right portions of the steam passage opening seal portion 18A in the internal space of the standing pouch 1 expand near the upper end of the standing pouch 1. As a result, stress concentrates on the steam passage seal portion 18A.

  For this reason, in the heat-sealed area near the upper end of the standing pouch 1, the heat seal is broken earlier than the other parts in the steam passage opening seal part 18A, and the seal retreats. The retreat of the seal is caused by peeling between the layers of the laminated body in which the heat seal in the steam passage port seal portion 18A is a packaging material or breakage of the heat seal. When the retreat of the seal reaches the steam passage opening induction portion 18B, the inside space of the standing pouch 1 and the steam passage opening induction portion 18B communicate with each other to form a steam passage hole. By releasing the water vapor generated in the standing pouch 1 to the outside and reducing the internal pressure, it is possible to prevent the standing pouch from being ruptured due to excessive internal pressure.

  FIG. 3 is a sectional view taken along line XX ′ shown in FIG. FIG. 3 is a cross-sectional view of the one side sealing portion 17 of the standing pouch 1 according to the present embodiment, taken along line XX ′. The side seal portion 17 is joined by an ultrasonic seal. Various shapes can be adopted for the shape of the joining portion of the ultrasonic seal according to the shape of the horn that generates ultrasonic waves and the shape of the anvil on the receiving side. In the standing pouch 1 according to the present invention, the convex portions 21 and the concave portions 22 are formed in the thickness direction of the laminated body, and the cross-sectional shape is substantially triangular or substantially trapezoidal. And have an arc shape. FIG. 4 is a plan view of the side seal portion 17 as viewed from the thickness direction. Note that the side seal portion 17 is rotated 90 degrees for easy viewing, and the lower part of the figure is the storage part side, and the upper part is the outer side of the pouch. As shown in FIG. 4, the planar shape of the convex portion 21 (the shape of the side seal portion 17 viewed from the thickness direction) is a rectangle. In the example shown in FIG. 3, the convex portion 21 and the concave portion 22 are formed on the front trunk portion 11, but the convex portion 21 and the concave portion 22 may be formed on the rear trunk portion 12. The concave portion 22 is formed by the sealant 2 and the like made of a plastic film of the front body portion 11 and the rear body portion 12 that are melted by heat generated during the ultrasonic sealing and melted and bonded by pressing, and flowed from the concave portion 22. The protrusion 21 is formed by the sealant 2 made of a plastic film or the like.

  If the side seal portion 17 is the side where the contents are filled and the side is ultrasonically sealed after the contents are filled, the contents may be bitten when the ultrasonic sealing is performed. There is little danger that the mixed contents are extruded with the flow of the resin as described above and remain in the side seal portion 17. Also, even if the contents 26 remain bitten as shown in FIG. 3, the resin 21 is taken into the convex portion 21 as the resin flows, and the convex portion 21 has a sufficient thickness even in the biting state. There is little risk that the sealing strength will decrease with the biting.

  The projections 21 have a rectangular planar shape and are regularly arranged. Since one side 23 of the rectangular protrusions 21 arranged on the storage section 7 side is arranged along one straight line, the boundary 8 of the side seal section 17 on the storage section side also has a single linear shape. ing. For this reason, when the contents are stored in the standing pouch 1 and heated by a microwave oven or the like for cooking or the like, even if the internal pressure increases due to the generated steam, a portion where the stress concentrates on the storage portion side of the side seal portion 17. This prevents the side seal from being broken due to the concentration of stress.

  The form of the protrusion 21 is not limited to the above example. For example, FIG. 5 is a plan view of the side seal portion 17 in which one row of the convex portions 21 located on the storage unit side is triangular. FIG. 5 shows an example in which rectangular projections 21 are regularly arranged in a diagonal direction in the side seal portion 17 in a so-called diamond shape. The appearance is beautiful and the shape is often used for practical use. In addition, the convex part 21 may be a rhombus in which a rectangle is slightly collapsed. FIG. 8 is a plan view of the side seal portion in which the protrusions located on the storage unit side are arranged in a saw-tooth shape. In such a diamond-shaped arrangement, as shown in FIG. 8, the boundary of the side seal portion 17 on the storage portion side is a sawtooth line 9. In addition, in the standing pouch 1 of the present invention, as shown in FIG. 5, one row of the protrusions 21 located on the storage section side is formed as a triangle 31 and the sides 33 are arranged on the storage section side. Thus, the boundary 8 on the storage section side is configured to be one straight line. As shown in FIG. 5, by arranging the convex portions 21 so that the boundary 8 on the storage unit side becomes one linear shape, concentration of stress on the boundary 8 during heating is prevented, and the side seal portion is broken. Can prevent sealing.

  FIG. 6 is a plan view of the side seal portion 17 for explaining a variation in position from one straight line of one side of the convex portion 21 located on the storage unit side. When the rectangular projections 21 are regularly arranged in the side seal portion 17, the positions of the projections 21 may be slightly shifted due to process variations or the like. FIG. 6 shows an example in which such a positional deviation d4 has occurred, and the convex portions 25 are arranged slightly shifted toward the storage section. If the positional deviation d4 becomes large, the effect of linearly arranging the convex portions 25 becomes weak. Therefore, the positional deviation d4 is preferably set to ± 5 mm or less. It should be noted that such a displacement may occur in the actual process, and such a standing pouch is also included in the scope of the present invention.

  FIG. 7 is a plan view of the side seal portion 17 for explaining the inclination from one straight line of one side of the convex portion 21 located on the storage unit side. FIG. 7 is an example of a case where a positional deviation from the regular arrangement of the protrusions 21 occurs as an angular deviation. When the angle shift occurs, the effect of linearly arranging the convex portions 21 becomes weak as in the case of the position shift as shown in FIG. 7. Therefore, the angle shift α is preferably set to 10 ° or less. Such a displacement can naturally occur in an actual process, and such a standing pouch is also included in the scope of the present invention.

  Needless to say, the above description is applied to the side seal portion 16 in the same manner. Which of the left seal portion 16 and the right seal portion 17 is sealed in advance before filling the contents and which is used as the filling port for the contents is arbitrary.

  A method for manufacturing the standing pouch 1 will be described. The laminate 1A is cut into an arbitrary shape. A steam venting mechanism is provided at the upper end of the body formed by the laminate 1A. Both side portions of the front body portion 11 and the rear body portion 12 are used as side seal portions 16 and 17, one side seal portion 16 or 17 is connected by ultrasonic sealing, and the other side seal portion 16 or 17 is a content. After filling the contents as an opening for filling, ultrasonic sealing is performed. At the time of this sealing, a plurality of irregularities 21 in the thickness direction are regularly arranged on at least one surface of the front body portion 11 or the rear body portion 12 of the side seal portions 16 and 17, and the arranged irregularities 21 are stored. It is formed so that the part side is arranged along one straight line.

  As described above, in the standing pouch with a steam venting mechanism of the present invention, the side seal portion is provided with regular irregularities by ultrasonic sealing and sealed, so that the sealing strength is reduced due to biting of the contents at the time of filling. The standing pouch is less likely to be broken, and the storage portion side of the side seal portion is linear, so that stress due to the internal pressure during heating and cooking does not concentrate on a specific portion, and a standing pouch that is less likely to break open. Can be provided.

Hereinafter, the present invention will be described in more detail with reference to Examples.
<Example 1>
The front body part, the back body part and the bottom part are formed with the laminate of the plastic film having the following configuration, the top part and the bottom part are joined by heat sealing, and the left and right side sealing parts are joined by ultrasonic sealing to a predetermined shape. A standing pouch with points was created. The right side seal portion was joined after the contents were filled.
Laminate: unstretched polypropylene (sealant: thickness 70 μm) / urethane adhesive / biaxially stretched nylon (intermediate resin film: thickness 15 μm) / urethane adhesive / polyethylene terephthalate (thickness 12 μm) with silicon oxide vapor deposited layer and organic barrier With a coating layer (barrier film)
Ultrasonic sealing conditions: amplitude 80%, pressure 0.4 MPa, time 0.4 seconds Side seal portion: squares with a side length of 1.2 mm and convex portions arranged in a grid pattern as illustrated in FIG. And sealed.
The created pouch was evaluated under the following conditions. The results are summarized in Table 1.
(Dynamic load test)
At five evaluation pouches filled with 170 ml of water, stress was applied until a bag was broken by applying a load. When the bag was not broken at 400 kgf or more, ◎ (VERY GOOD), when the bag was not broken at 100 kgf or more, Δ (GOOD), and when the bag was broken at less than 100 kgf, X (BAD). The number on the right side of the evaluation result indicates the number of samples of the corresponding evaluation pouch.
(Permeation test)
Five evaluation pouches filled with 170 ml of water were placed in a microwave oven and heated at an output of 500 W until steam was passed. When the steam was passed normally from the steaming port (GOOD), when the side seal portion peeled off and the content erupted before steaming from the steaming port, the rating was x (BAD).

<Example 2>
Regarding the shape of the side seal portion, as shown in FIG. 5, the convex portions are regularly arranged in an oblique direction, and one row located on the storage portion side is a triangle, and the boundary on the storage portion side is a straight line. A pouch was prepared and evaluated in the same manner as in Example 1 except for the above. The results are summarized in Table 1.

<Example 3>
The pouch was formed in the same manner as in Example 1 except that the shape of the side seal portion was arranged in a diamond shape as illustrated in FIG. 8 and the storage portion side was arranged in a sawtooth shape, and evaluation was similarly performed. went. The results are summarized in Table 1.

<Comparative Example 1>
A pouch was prepared and evaluated in the same manner as in Example 1, except that the side seal portion was not heat-sealed with a flat plate without any unevenness. The conditions for heat sealing were as follows: time 1 second, pressure 0.7 MPa, temperature 180 ° C.
Table 1 summarizes the results of the examples and comparative examples.

  As is clear from Table 1, the standing pouch according to the present invention satisfies all the characteristics, but the comparative example was insufficient in any of the characteristics.

REFERENCE SIGNS LIST 1 Standing pouch 1A with vapor release mechanism 1A Laminate 2 Sealant 3, 5 Urethane adhesive 4 Intermediate resin film 6 Barrier film 7 Storage section 8 Storage section side boundary 11 Front body section 12 Rear body section 13 Notch 14 Bottom section 15 Part 16 left seal part (side seal part)
17 Right seal part (side seal part)
18 Steam venting mechanism 18A Vapor port seal sections 18B, 33C, 52, 52A, 53, 53A, 53B, 53C, 54 Vapor port induction sections 21, 25 Convex section 22 Concave section 23 One side 26 of the convex section 31 Triangle 33 Side α Angle shift d4 Position shift

Claims (5)

It is formed using a laminate having a sealant layer as a base material of a plastic film, has a body including a front body and a rear body, and a bottom, has a bag shape, and has a storage part therein. And a standing pouch that can be self-supporting with the bottom part as a lower side,
A steam vent mechanism provided at an upper end of the body, and a side seal portion connecting the front body and the rear body,
A standing pouch with a steam venting mechanism, wherein a plurality of irregularities in a thickness direction are regularly arranged on at least one surface of the front trunk portion or the rear trunk portion of the side seal portion. The planar shape of the projections of the irregularities is rectangular, and at least one side of the projections arranged on the storage section side of the side seal section is arranged along one straight line. The standing pouch with a steam venting mechanism according to claim 1. A row of planar shapes located on the storage portion side of the side seal portion of the projections of the irregularities are each a triangle, and one side of the triangle is arranged along one straight line facing the storage portion side. The standing pouch with a steam venting mechanism according to claim 1, wherein: The steam vent mechanism,
A steam port seal portion provided at an upper end portion of the body portion,
A steam port induction section formed by cutting the body in the thickness direction of the laminate in a region where the steam port seal section is provided,
The standing pouch with a steam venting mechanism according to any one of claims 1 to 3, comprising: A body including a front body and a back body by a laminate having a sealant layer as a base material of a plastic film, and a bottom part are formed to form a bag shape in which one side of the body is open, A method of manufacturing a standing pouch with a steam venting mechanism, which has a storage portion and is capable of standing independently with the bottom portion being a lower side,
A steam venting mechanism is provided at the upper end of the body, and both sides of the front body and the rear body are used as side seals. The side seal portion is sealed by ultrasonic sealing after filling of the content as an opening for filling the content, and at least one surface of the front body portion or the rear body portion of the side seal portion has a thickness direction. A method of manufacturing a standing pouch with a steam venting mechanism, wherein a plurality of irregularities are regularly arranged, and the storage portion side of the arranged irregularities is arranged along one straight line.

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