JP2006224975A - Manufacturing method of packaging bag for cooking - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a packaging bag for cooking capable of consistently forming a vent seal part to be reliably peeled during the cooking. <P>SOLUTION: In the manufacturing method of the packaging bag 1 for cooking, a vent is closed by a vent seal part 8 having a shape protruded inward of a packaging bag 1 from an inner edge of a side edge seal part 5, and after contents are sealed inside, the vent seal part 8 is peeled and the vent is opened when the pressure inside the bag is not less than a predetermined value. The manufacturing method comprises a step of sealing only the side edge seal part 5 by using a first transverse seal member 41 having a side edge seal part-forming part 43 in a step of forming the side edge seal part 5, and a step of sealing both the side edge seal part 5 and the vent seal part 8 by using a second transverse seal member 42 having a side edge seal part forming part 43 and a vent seal part-forming part 44 protruded from the side edge seal part-forming part 43. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a packaging bag for cooking by heating, which can be cooked by heating the contents in a microwave oven or the like without opening the packaging bag.

  In recent years, retort foods in which food is sealed in a packaging bag and sterilized by retort have become widespread. When a packaging bag in which such food is sealed is heated in a microwave oven, the air in the packaging bag expands, water vapor is generated from the food, and the like, resulting in a high pressure in the packaging bag. From such a point, various packaging bags devised so that the vents automatically open when heated in a microwave oven have been proposed.

For example, the packaging bag of Patent Document 1 is provided with a doughnut-shaped outer edge seal portion around a through-hole serving as a vent through a buffer portion made up of an unsealed portion or a weakly sealed portion. The vent is opened when the part is peeled off by the pressure inside the packaging bag.
In this type of packaging bag, it is necessary to peel off the vent seal part that seals the periphery of the vent before the peripheral seal part that seals the periphery of the packaging bag during cooking.
JP 2003-192042 A

  However, the conventional packaging bag for cooking by heating requires a complicated device and control in order to manufacture the vent and the vent seal part around the vent, and a method that can be easily manufactured at a relatively low cost is desired. It was.

  This invention is made | formed in view of the said situation, and provides a manufacturing method of the packaging bag for heat cooking which can form stably the vent seal part which peels reliably at the time of heat cooking And

  In order to solve the above-described problem, the present invention provides a side edge seal portion formed by sealing side edges of a pair of body members, and one of the body members is an inner edge of the side edge seal portion. A vent hole drilled at a position in contact with or at an inner position from this position, and the vent hole projects from the inner edge portion of the side edge seal portion to the inside of the packaging bag. The seal of the vent seal part is less than the seal strength of the side edge seal part, and after sealing the contents inside, the vent seal part peels off when the inside becomes a predetermined pressure or more. And the manufacturing method of the packaging bag for heat cooking comprised so that the said vent may be opened, Comprising: A pair of long strip | belt-shaped film used as the said trunk | drum member is made into the horizontal direction which is a direction which crosses this film. Sealing the side edge seal And a step of cutting the sealed films and separating them into individual packaging bags, wherein the step of forming the side edge seal portion includes a side edge seal portion forming portion. A step of sealing only a region corresponding to the side edge seal portion using a lateral seal member; a second edge seal portion forming portion; and a vent hole seal portion forming portion protruding from the side edge seal portion forming portion. And a step of sealing a region corresponding to both the side edge seal portion and the vent seal portion using a lateral seal member.

In the present invention, the packaging bag for cooking by heating has an unsealed or weakly sealed portion around the vent, and a vent seal portion that closes the vent around the unsealed or weakly sealed portion As the second horizontal seal member, the vent seal portion forming portion has a recess recessed from the film contact surface, and the periphery of the recess is larger than the vent. When the second lateral seal member is disposed on the body member using a seal member, the vent is disposed at a position included in the recess, and an unsealed or weakly sealed area is formed around the vent. At the same time as forming the portion, it is preferable to form the vent seal part around the unsealed or weakly sealed portion.
It is preferable that the concave portion of the vent seal portion forming portion has a tapered inner surface whose depth from the film contact surface gradually increases from the peripheral edge of the concave portion.

  According to the present invention, a bottom member folded inwardly is interposed between lower portions of a pair of body members, and lower end edges of opposing surfaces where the body member and the bottom member face each other are sealed. It is possible to apply to the manufacture of a packaging bag for cooking that has a bottom seal part formed in this case, and in this case, prior to the side edge seal part forming step, A step of interposing a long belt-like film serving as the bottom member between a pair of belt-like films, and a bottom seal by sealing the long body member and the bottom member in the longitudinal direction along the longitudinal direction of the film Forming a part.

According to the present invention, by providing the step of heat-sealing only the side edge seal portion, the number of times that the vent seal portion undergoes heat sealing is less than the number of times that the side edge seal portion undergoes heat sealing. It is possible to reliably obtain a difference in seal strength such that the seal strength of the mouth seal portion is weaker than the seal strength of the side edge seal portion.
Further, in the step of simultaneously forming the side edge seal portion and the vent seal portion, a recess recessed from the film contact surface is provided in the vent seal portion forming portion as the second lateral seal member, and the periphery of the recess When the second lateral seal member is disposed on the body member using the one having a shape larger than that of the vent, the vent is disposed at a position included in the recess, so that the recess Corresponding to the shape, a portion to be unsealed or weakly sealed can be formed around the vent, and at the same time, a vent seal can be formed around the unsealed or weakly sealed portion. Thereby, after peeling of the vent seal part starts, the vent can be quickly opened when the part reaches the part where the peeling becomes an unsealed or weak seal.
In the obtained packaging bag, since the vent seal part that closes the vent protrudes inward of the packaging bag from the side edge seal part, the internal pressure of the packaging bag acts more strongly on the vent seal part. . Therefore, when the internal pressure of the bag becomes higher than a predetermined pressure during cooking, the vent seal part is surely peeled off and the vent is opened, so there is no risk of the contents leaking out and cooking is performed safely. be able to.

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 for heat cooking according to the present invention (hereinafter sometimes simply referred to as a packaging bag), FIG. 1 (a) is a front view, and FIG. 1 (b) is FIG. The longitudinal cross-sectional view which follows the AA line of a), FIG.1 (c) is a back view. In FIGS. 1A and 1C, hatched lines are used to indicate heat-sealed portions.
FIG. 2 is a drawing for explaining the operation of the cooking bag for cooking of FIG. 1, (a) is a front view for explaining a state in which the inside of the packaging bag is pressurized, and (b) is B in (a). Sectional drawing along line -B, (c) is a partial sectional view showing how internal gas escapes from the vent.

As shown in FIG.1 (b), this packaging bag 1 is comprised from a pair of trunk | drum members 2 and 3, and the bottom member 4 folded in half centering on the fold line 4a, and the bottom member 4 is interposed between the lower portions of the pair of body members 2 and 3 so that the folding line 4a faces inward.
Here, as a film used for the trunk members 2, 3 and the bottom member 4, a single-layer film made of one kind of resin, a coextruded film having a multilayer made of one kind or plural kinds of resins, a laminate film, and a laminate A film or the like can be used. The film needs to have at least one surface having a heat seal property, and as such a film, for example, a sealant layer made of a resin having a heat seal property is laminated on the surface of a base material layer made of a stretched film or the like. A laminate film can be used.
The pair of body members 2 and 3 are opposed to each other with the surface having heat sealability as the inside. Further, the bottom member 4 is folded in two so that the surface on the side having heat sealability is on the outer side, and faces the surfaces having heat sealability on both the body members 2 and 3.

In order to impart gas barrier properties, a ceramic vapor-deposited film obtained by vapor-depositing ceramic such as alumina (Al ₂ O ₃ ) or silica (SiO _x ) may be provided on the film. In this case, it is preferable because gases such as oxygen and water vapor are prevented from passing through the film, and the storability of the contents is improved, enabling long-term storage at room temperature. Moreover, since a metal layer is not contained in a film, there is no possibility of sparking when heated in a microwave oven. Furthermore, since the transparency of the film is secured, the inside of the packaging bag 1 can be easily inspected, and the metal can be detected by electrical radiation, and the detector can be installed by an in-line pinhole test at the time of filling. Therefore, it is preferable.

Examples of the resin constituting the sealant layer include polyethylene (PE), polypropylene (PP), and ethylene-vinyl alcohol copolymer. For example, the same grade cast polypropylene (random polymer or block polymer) or different grade cast polypropylene is used as the sealant layer of the body members 2 and 3 and the sealant layer of the bottom member 4, and heat seal is performed between the polypropylenes. You can also.
The base material layer may be a single layer or a combination of multiple layers made of a polyester resin such as polyethylene terephthalate (PET) or a polyamide resin such as nylon.
The body members 2 and 3 and the bottom member 4 may have the same structure, material, thickness, or the like as long as they can be joined to each other by heat sealing.

Side edge seal portions 5 are formed on both side edges of the packaging bag 1. In the side edge seal portion 5, in the lower part where the bottom member 4 is interposed between the body members 2, 3, both side edges of each body member 2, 3 are heat-sealed with both side edges of the bottom member 4. . In addition, at the portion where the bottom member 4 above is not interposed, the side edges of the body members 2 and 3 are heat-sealed. In the present embodiment, the side edge seal portion 5 (excluding the vent seal portion 8 and the deformation seal portion 9) is linear. In the present invention, the aspect of the side edge seal portion 5 is not particularly limited, and for example, a curved shape such as an arc shape, a wavy line shape, a diagonal line shape that obliquely intersects the film transport direction, and the like. You can also. Further, the width of the side edge seal portion 5 may not be constant. For example, the deformed seal portion 9 is protruded inward of the packaging bag to provide a locally wide portion, or conversely, the width is locally increased. There may be provided a portion where becomes narrower.
In addition, a bottom seal portion 6 is formed at the lower portion of the packaging bag 1 by heat-sealing the body members 2, 3 and the bottom member 4 at the lower end edges of the opposing surfaces facing each other.
Furthermore, a notch 4b can be provided in a part of the bottom member 4 by a punch hole or the like, and the one body member 2 and the other body member 3 can be heat-sealed through the notch 4b.

  One body member 2 has a vent hole 7 formed at a position in contact with the inner edge portion 5a of the side edge seal portion 5 or at a position on the inner side from this position. The vent 7 is a through hole formed in one of the body members 2 and is closed by a vent seal 8 having a shape protruding from the inner edge 5 a of the side edge seal 5 to the inside of the packaging bag 1. Yes. The vent seal 8 is formed by heat-sealing the opposing surfaces of one barrel member 2 and the other barrel member 3, and the seal strength of the vent seal 8 is the side edge seal. The seal strength of the portion 5 is smaller. The sealing strength of the vent seal 8 is preferably about 80% to 70% of the sealing strength of the side edge seal 5. The seal strength of the vent seal 8 is desirably 23 N / 15 mm or more after the retort sterilization treatment.

The vent seal portion 8 does not need to cover the entire circumference of the peripheral edge of the vent aperture 7. For example, as shown in FIG. 1A, the vent seal portion 8 is on the boundary line between the side edge seal portion 5 and the vent seal portion 8. 7 is positioned, the vent seal 8 covers only a part of the periphery of the vent 7 (the right side of the vent 7 in FIG. 1A), and the remaining perimeter of the vent 7 The side edge seal part 5 can also be configured to cover this part. A portion 8 a that is not sealed or weakly sealed may be provided around the vent 7. Further, a deformed seal portion 9 (not particularly essential) protruding from the side edge seal portion 5 may be provided at a position symmetrical to the vent seal portion 8.
The shape of the vent 7 is not particularly limited, and can be, for example, a circle, an ellipse, a square, a rectangle, or the like. The size of the vent 7 may be selected so that the gas inside the packaging bag 1 can easily escape when the vent 7 is opened and the contents are not easily leaked from the vent 7.
The shape in which the vent seal portion 8 protrudes from the inner edge portion 5a of the side edge seal portion 5 is that the vent seal portion 8 includes the inner edge portion 5a of the side edge seal portion 5 and the peripheral edge of the vent seal portion 8. It is only necessary to have a portion located inside the straight line connecting the two points 8b and 8c serving as the boundary, and the specific shape is not particularly limited, but for example, a triangular shape, a trapezoidal shape, a rectangular shape, Various shapes such as a semicircular shape can be employed.

In the packaging bag 1, after the contents (not shown) such as food are sealed inside through the opening 10 opened at the top, the opening 10 is closed by sealing the upper ends of the body members 2 and 3. Is done. That is, the entire peripheral edge of the packaging bag 1 is sealed by the side edge seal portion 5, the bottom seal portion 6, and the seal portion (not shown) that closes the opening portion 10 to seal the inside. The sealing strength of the vent seal portion 8 is set to be smaller than the sealing strength of the peripheral seal portion. When the retort sterilization treatment is performed after sealing the packaging bag 1, the seal strength of the peripheral seal portion formed on the periphery of the packaging bag 1 may be 23 N / 15 mm or more (2.3 kgf / 15 mm or more) after the retort sterilization treatment. desirable.
After sealing, the contents can be sterilized by heat sterilization such as retort sterilization or boil sterilization.

When the contents of the packaging bag 1 are cooked with a microwave oven or the like, the packaging bag 1 of this embodiment is a standing pouch having self-sustainability, so the folding line 4a of the bottom member 4 is opened and the bottom of the packaging bag 1 is opened. By spreading, it is possible to cook with the packaging bag 1 standing. When the packaging bag 1 is laid down and cooked, such as when the packaging bag is a flat bag, one body member 2 is placed on the upper side and the other body member 3 is placed on the other side so that the air vent 7 faces upward. Put it in.
When cooking is performed, if a gas such as air is present inside the packaging bag 1, it expands, and the water vapor generated by the evaporation of the water in the contents expands, causing the inside of the packaging bag 1 to have a high pressure. Then, as shown in FIG. 2A, the pressure is applied in a circular shape from the center of the packaging bag 1.
Since the vent seal part 8 protrudes from the side edge seal part 5 to the inside of the bag, the internal pressure of the packaging bag 1 acts on the vent seal part 8 more strongly. When the inside of the packaging bag 1 reaches a predetermined pressure or more, as shown in FIG. 2C, the vent seal part 8 is peeled off and the vent 7 is opened. Accordingly, excess gas or the like inside the packaging bag 1 escapes from the vent hole 7, and the internal pressure of the packaging bag 1 decreases. Since the sealing strength of the vent seal part 8 is lower than the sealing strength of the side edge seal part 5, even if the vent seal part 8 completely peels off, the side edge seal part 5 does not peel off. The bottom of the packaging bag 1 and the leakage of contents do not occur. In this way, cooking can be performed safely.

Here, the manufacturing method of the packaging bag for heat cooking which concerns on this invention is demonstrated. FIG. 3 is a schematic view showing an example of a bag making machine used in the method for manufacturing a cooking bag for cooking according to the present invention.
FIG. 4 is a view for explaining a process of sealing the long body member and the bottom member in the longitudinal direction along the longitudinal direction of the film. FIG. 4 (a) is a plan view showing the longitudinal seal member, and FIG. ) Is an explanatory view showing a region sealed by the vertical seal member of FIG.
FIG. 5 is a view for explaining a process of sealing long body members in a lateral direction perpendicular to the longitudinal direction of the film. FIG. 5 (a) is a plan view showing the lateral seal member, and FIG. 5 (b). Is an explanatory view showing a region sealed by the horizontal sealing member of FIG. 5 (a), FIG. 5 (c) is a sectional view taken along the line CC of FIG. 5 (a), and FIG. It is a schematic diagram explaining the positional relationship with a vent seal | sticker part formation part.
In addition, although the bag making machine 20 shown in FIG. 3 manufactures the packaging bag 1 by two chamfers arranged in two rows in the width direction orthogonal to the film conveyance direction, in FIG. 4 (b) and FIG. 5 (b), For simplification of the drawing, only one row of packaging bags 1 is shown. 4 (b) and 5 (b), since the film is not separated into the individual packaging bags 1, the portions corresponding to the individual packaging bags 1 are indicated by two-dot chain lines, and the sealing members 31, 41, The range is clarified by hatching 42.

  The bag making machine 20 shown in FIG. 3 includes a body member supply reel 21 (body member supply means) around which a long belt-like film 21 a serving as the body members 2 and 3 is wound, and a long band-like film serving as the bottom member 4. A bottom member supply reel 22 (bottom member supply means) around which the film is wound and a film 21a wound around the barrel member supply reel 21 are cut along the longitudinal direction thereof to form two barrel members 2 having the same width. , 3, a matching roll 23 that faces the body members 2, 3 and the bottom member 4 so that the inner surfaces of the packaging bag 1 face each other, and the body members 2, 3 are the bottom members Side seal part by heat-sealing the body members 2, 3 and the bottom member 4 in the width direction perpendicular to the film transport direction. Second sealing means 26 forming 5 The film conveying means 27 for conveying the body members 2, 3 and the bottom member 4, and the second and the second members for cutting the body members 2, 3 and the bottom member 4 sealed from each other in the direction along the film conveying direction and in the width direction. Third cutters 28 and 29 are provided.

A manufacturing example of the packaging bag 1 for heat cooking using the bag making machine 20 will be described below.
First, the film 21 a wound around the body member supply reel 21 is cut by the first cutter 24 into two body members 2 and 3 having the same width and forming a strip shape along the longitudinal direction. Further, after the vent hole 7 is formed in one of the body members 2 by a puncher (not shown), the inner surfaces of both the body members 2 and 3 are arranged to face each other by the mating roll 23.
The aligning roll 23 is configured to deflect the feeding direction of the body members 2 and 3 so that the front and rear and left and right positions of the upper and lower body members 2 and 3 are accurately superimposed. Then, the bottom member 4 is inserted between the body members 2 and 3. The body members 2 and 3 and the bottom member 4 are conveyed by the film conveying means 27 in a state where they are superposed in a predetermined order.

  The film conveying means 27 intermittently conveys the barrel members 2, 3 and the bottom member 4 with a constant cycle by a control not shown in the figure, and the conveyance of the drum members 2, 3 and the bottom member 4 is a constant feed every cycle. It is preferable that the conveyance is stopped when the body members 2 and 3 and the bottom member 4 are heat-sealed so that the dimensions are obtained. The feed dimensions of the body members 2 and 3 and the bottom member 4 are controlled by detecting a pitch printed pattern provided on either of the body members 2 and 3 with an optical sensor such as a CCD camera. It is also possible to control based on the information provided.

  In the first sealing means 25, as shown in FIG. 4 (a), the longitudinal direction is arranged in such a direction that the longitudinal direction follows the transport direction of the film (the left-right direction in FIGS. 4 (a) and 4 (b)). A seal member 31 is used. The vertical seal member 31 is a mold made of aluminum, gun metal, casting, or the like, and as shown in FIG. 4B, bottom seal portion forming portions 32, 32 that form the bottom seal portion 6 of the packaging bag 1. ,... Are provided and heated by a heater (not shown). The repetition pitch of the bottom seal portion forming portions 32, 32,... Is made equal to the transport pitch of the films 2, 3, 4 and the bottom seal portion forming portions 32 that differ each time the films 2, 3, 4 are transported once. Can be pressurized and heated. Therefore, the region corresponding to the bottom seal portion 6 of one packaging bag 1 is repeatedly heat-sealed by one vertical seal member 31 a number of times equal to the number of bottom seal portion forming portions 32, 32,.

After the sealing by the first sealing means 25 is completed, the second sealing means 26 heat seals the one body member 2 and the other body member 3 in the width direction perpendicular to the film transport direction. The side edge seal portion 5 is formed.
As shown in FIGS. 5 (a) and 5 (b), the second sealing means 26 is juxtaposed with a predetermined interval along the film transport direction (left and right direction in FIGS. 5 (a) and 5 (b)). A plurality of transverse seal members 41 and 42 are provided. The horizontal seal members 41 and 42 include a first horizontal seal member 41 having a side edge seal portion forming portion 43 for sealing only a region corresponding to the side edge seal portion 5, the side edge seal portion 5, and a vent. A second lateral seal member 42 having a side edge seal portion forming portion 43 and a vent seal portion forming portion 44 having a shape protruding from the side edge seal portion forming portion 43 to seal a region corresponding to both of the seal portions 8. With.
In the present embodiment, the side edge seal portion forming portion 43 is linear and has the same width corresponding to the shape of the side edge seal portion 5. In the present invention, the aspect of the side edge seal portion forming portion 43 is not particularly limited, and for example, a curved shape such as an arc shape, a wavy shape, a diagonal shape that obliquely intersects the film conveyance direction, and the like. You can also Further, the width of the side edge seal portion forming portion 43 may not be constant. For example, the deformed seal portion forming portion 47 may be protruded.

These horizontal seal members 41 and 42 are arranged in a direction in which the longitudinal direction is the width direction of the film (direction perpendicular to the transport direction), and each of the horizontal seal members 41 and 42 covers the side portion of the packaging bag 1. It is designed to heat seal once. Each horizontal seal member 41, 42 is a mold made of aluminum, gun metal, casting or the like, and is heated by a heater (not shown).
The second horizontal seal member 42 is a deformed seal portion forming portion 47 (not particularly essential) that protrudes on the opposite side of the side edge seal portion forming portion 43 from the side where the vent hole seal portion forming portion 44 is provided. The deformation seal portion 9 can be formed by the deformation seal portion forming portion 47. In this case, in the second lateral seal member 42, the vent seal part forming part 44 and the deformed seal part forming part 47 are arranged symmetrically with respect to the longitudinal center line of the side edge seal part forming part 43. become.

  As shown in FIG. 5C, the vent seal part forming part 44 of the second horizontal seal member 42 has a concave part 46 that is recessed from the film contact surface 45 of the side edge seal part forming part 43. The film contact surface 45 is a surface on which the side edge seal portion forming portion 43 and the vent seal portion forming portion 44 of the lateral seal members 41 and 42 are in contact with the body member. In order to perform horizontal sealing, as shown in FIG. 5 (d), the film contact surface 45 is brought into contact with the outer surface of one barrel member 2, and the cradle 48 is brought into contact with the outer surface of the other barrel member 3. The body members 2 and 3 are sandwiched between the members 41 and 42 and the cradle 48 and heat sealed. Here, the cradle 48 is preferably a rubber plate made of, for example, silicone rubber (hardness is, for example, about 40 to 70 °). By using a flexible rubber plate as the cradle 48, the sealing pressure is less likely to vary, and a uniform mold surface can be obtained as compared with the case where the metal plate is sandwiched and sealed.

  The recess 46 preferably has a shape in which the peripheral edge 46 a is larger than the vent hole 7. As shown in FIG. 5 (d), when the film contact surface 45 of the second horizontal seal member 42 is brought into contact with one of the body members 2, the film contact surface 45 around the recess 46 is connected to the vent 7. The vents 7 are arranged at positions where they do not overlap and are included in the recess 46. As a result, an unsealed portion 8a corresponding to the recess 46 (or a weakly sealed portion having easy peelability as a result of being slightly heated by heat conducted from the surroundings) is formed around the vent hole 7. At the same time, the vent seal part 8 can be formed around the unsealed part 8 a by the film contact surface 45 of the vent seal part forming part 44.

When the vent 7 is circular, the peripheral edge 46a of the recess 46 is preferably circular. At this time, the diameter D of the peripheral edge 46a of the recess 46 is preferably about 3 to 7 mm larger than the diameter F of the vent hole 7 when the diameter of the vent hole 7 is F (see FIG. 5D). For example, DF is preferably about +5 mm.
In addition, the recess 46 of the vent seal forming portion 44 preferably has a tapered (conical surface) inner surface 46 b in which the depth from the film contact surface 45 gradually increases from the peripheral edge 46 a of the recess 46. When the vent 7 is circular, the bottom surface 46c of the recess 46 is preferably circular. At this time, the diameter E of the bottom surface 46 c of the recess 46 is preferably smaller by about 1 to 3 mm than the diameter D of the peripheral edge 46 a of the recess 46. For example, DE is preferably about +2 mm.
Further, the diameter E of the bottom surface 46 c of the recess 46 is preferably about 2 to 4 mm larger than the diameter F of the vent hole 7. For example, EF is preferably about +3 mm.
The maximum depth d of the recess 46 is preferably about 1 to 2 mm so that the bottom surface 46 c of the recess 46 does not contact the body member 2.
In the present invention, as the second lateral seal member 42, the film contact surface 45 of the vent seal part forming portion 44 is flat, and the film contact surface 45 is a film of the side edge seal portion forming part 43. The thing of the shape which exists on the same surface as the contact surface 45 can also be used.

  The region corresponding to the side edge seal portion 5 is heat-sealed by the side edge seal portion forming portion 43 of the first side seal member 41 and also by the side edge seal portion forming portion 43 of the second side seal member 42. Heat sealed. On the other hand, the region corresponding to the vent seal portion 8 is not heat sealed by the first horizontal seal member 41, but is only heat sealed by the vent seal portion forming portion 44 of the second horizontal seal member. Is done. For this reason, the number of times that the vent seal portion 8 undergoes heat sealing is less than the number of times that the side edge seal portion 5 undergoes heat sealing. Thereby, a difference in seal strength can be reliably obtained such that the seal strength of the vent seal portion 8 is weaker than the seal strength of the side edge seal portion 5.

  When the concave portion 46 is provided on the sealing surface of the vent seal portion forming portion 44, the vent seal portion forming portion 44 is less likely to hit the body members 2 and 3 than the side edge seal portion forming portion 43, and Corresponding to the shape, an unsealed or weakly sealed portion 8 a can be formed around the vent 7. Since the seal strength between the body members 2 and 3 is small in the unsealed or weakly sealed portion 8a and easily peels off, after the start of peeling of the vent seal part 8, the peeling is unsealed or weakly sealed. When the part 8a is reached, the vent 7 can be quickly opened. In addition, since the film contact surface 45 of the vent hole seal portion forming portion 44 is provided on the same surface as the film contact surface 45 of the side edge seal portion forming portion 43 around the concave portion 46, Outside the weak seal portion 8a, it is possible to ensure 23 N / 15 mm or more after the retort sterilization treatment as the sealing strength of the vent seal 8.

In the present invention, since there is no need to provide a difference between the heating temperature of the side edge seal portion forming portion 43 and the heating temperature of the vent hole seal portion forming portion 44, no special control is required for the control of the heating temperature. It can be implemented.
There is no need to provide a difference in heating temperature or pressure, or to use a special material (film) that reduces the sealing strength in the portion corresponding to the vent seal 8 in order to obtain a difference in sealing strength. Productivity is high and manufacturing costs can be reduced.

  After the bottom seal portion 6 and the side edge seal portion 5 of the packaging bag are formed by heat sealing, the body members 2, 3 and the bottom member 4 are cut in the direction along the film conveyance direction by the second cutter 28, and The body members 2 and 3 and the bottom member 4 are cut by the third cutter 29 in the width direction orthogonal to the film transport direction. Thereby, individual packaging bags 1, 1,... Are separated. When the film is cut, the adjacent packaging bags 1 and 1 may be cut along the boundary line, but at a slight interval on both sides of the boundary line between the packaging bags 1 and 1. It may be cut at a point.

The second lateral seal member can be variously modified, and some modified examples will be described with reference to FIGS.
FIG. 6A is a plan view showing a second lateral seal member 42A according to the first modification, and FIG. 6B is a side edge seal portion and a vent seal portion using the second lateral seal member 42A. FIG. 6C is a plan view showing a packaging bag 1A according to Modification 1 manufactured using the second lateral seal member 42A.
FIG. 7A is a plan view showing a second horizontal seal member 42B according to the second modification, and FIG. 7B is a side edge seal portion and a vent seal portion using the second horizontal seal member 42B. FIG. 7C is a plan view showing the packaging bag 1B according to the modified example 2 manufactured using the second lateral seal member 42B.
FIG. 8A is a plan view showing a second lateral seal member 42C according to Modification 3. FIG. 8B is a side edge seal portion and a vent seal portion using the second lateral seal member 42C. FIG. 8C is a plan view showing a packaging bag 1C according to Modification 3 manufactured using the second lateral seal member 42C.

When manufacturing a packaging bag by chamfering, as shown in FIGS. 6 (b), 7 (b), and 8 (b), the lateral seal members 42A, 42B, and 42C are made of packaging bags arranged in two rows. It is desirable to form the side edge seal portion 5 at the same time.
The second horizontal seal member 42A shown in FIG. 6A is formed by forming two vent seal portions 44, 44 on the same side of the straight side edge seal portion 43. The second horizontal seal member 42B shown in FIG. 7 (a) has two vent seal part forming portions 44, 44 formed opposite to each other with respect to the linear side edge seal part forming part 43. It will be. According to these second lateral seal members 42A and 42B, the vent seal portion 8 is provided in contact with one side edge seal portion 5 as shown in FIGS. 6 (c) and 7 (c). Packaging bags 1A and 1B can be manufactured.

Further, the second horizontal seal member 42C shown in FIG. 8A is formed by forming the vent seal part forming parts 44, 44 on both sides of the linear side edge seal part forming part 43. According to the second lateral seal member 42C, as shown in FIG. 8C, the packaging bag 1C in which the vents 7, 7 and the vent seals 8, 8 are provided on the left and right sides of the bag is manufactured. be able to.
The second lateral seal member 42C uses one vent seal part forming part 44 as the deformed seal part forming part 47, so that the vent 7 and the vent are provided on one side of the bag as shown in FIG. The packaging bag 1 having the mouth seal portion 8 and the deformation seal portion 9 on the other side can also be manufactured.

As described above, according to the method for manufacturing a cooking bag for cooking according to this embodiment, the difference in seal strength is such that the seal strength of the vent seal portion 8 is weaker than the seal strength of the side edge seal portion 5. You can definitely get it. Therefore, productivity is improved and manufacturing at low cost is possible. Further, even if the heat sterilization treatment such as retort is performed after filling the contents and the sealing strength of the vent seal portion 8 is lowered, there is no possibility that the vent hole 7 is accidentally opened during the heat sterilization treatment.
In the obtained packaging bag 1, since the vent seal part 8 protrudes from the side edge seal part 5 to the inside of the packaging bag 1, the internal pressure of the bag acts on the vent seal part 8 more strongly. Therefore, when the internal pressure of the packaging bag 1 becomes higher than a predetermined pressure during cooking, the vent seal portion 8 is surely peeled off and the vent 7 is opened. When the internal pressure is reached, the vent 7 is surely opened, so that cooking can be performed safely.

In the present invention, the bottom member 4 of the packaging bag can be omitted. In this case, the present invention can be used to manufacture a flat bag.
In the case of the cooking bag 1, 1A, 1B, 1C of the above embodiment, the shape is substantially rectangular, but in the present invention, the shape of the packaging bag is not particularly limited thereto. For example, it can also be made circular as in the cooking bags 1D and 1E for heating and cooking shown in FIGS.
A packaging bag 1D of Modification 4 shown in FIG. 9 is a flat bag formed by sealing two body members at the periphery, and a packaging bag 1E of Modification 5 shown in FIG. 10 is a standing pouch having a bottom member 4. It is. In either case, a vent hole 7 is provided on one of the body members, and the vent hole 7 is closed by a vent hole seal portion 8 having a shape protruding from the inner edge portion 5 a of the side edge seal portion 5.
In such circular packaging bags 1D and 1E, the side edge seal portion 5 has a portion curved in an arc shape. In this case, by using a member having a side edge seal portion forming portion corresponding to the shape of the side edge seal portion 5 as the lateral seal member, it can be easily manufactured.

A standing pouch-type packaging bag as shown in FIG. 1 is manufactured by the apparatus and method described in the above embodiment, using a film having a three-layer structure of PET 12 μm / nylon 15 μm / polypropylene 60 μm as the body member and the bottom member. did.
The resulting packaging bag was filled with curry as the contents, and the opening of the packaging bag was sealed by heat sealing. Further, the packaging bag was heated at 125 ° C. for 30 minutes for retort sterilization.
When the packaging body in which the contents were sealed in the packaging bag was put into a microwave oven and heated, the water vapor and the like expanded inside the packaging bag, but the pressurized state was reached, but the vent seal part was 80-90. As a result of peeling in about 2 seconds, the air vent was opened without any noticeable sound, and the gas in the packaging bag escaped and the pressurized state of the packaging bag was eliminated. There was no leakage of the contents, and appropriate cooking was easily performed.

  INDUSTRIAL APPLICATION This invention can be utilized for manufacture of the packaging bag for heat cooking which can heat and cook the content with a microwave oven etc., without opening a packaging bag.

It is drawing which shows an example of the packaging bag for heat cooking of this invention, (a) is a front view, (b) is a longitudinal cross-sectional view which follows the AA line of (a), (c) is a back view. It is drawing explaining the effect | action of the packaging bag for heat cooking of this invention, (a) is a front view explaining the state by which the inside of the packaging bag was pressurized, (b) is BB line of (a). Sectional drawing which follows, (c) is a fragmentary sectional view which shows a mode that internal gas etc. escape from a vent hole. It is the schematic which shows an example of the bag making machine used for the manufacturing method of the packaging bag for heat cooking of this invention. It is a figure explaining the process of sealing a long trunk member and a bottom member in the vertical direction along the longitudinal direction of a film, (a) is a top view showing a vertical seal member, (b) is a vertical seal of (a). It is explanatory drawing which shows the area | region sealed with a member. It is a figure explaining the process of sealing long trunk members in the horizontal direction perpendicular | vertical to the longitudinal direction of a film, (a) is a top view which shows a horizontal seal member, (b) is the horizontal seal member of (a). Explanatory drawing which shows the area | region sealed by (c), (c) is sectional drawing which follows CC line of (a), (d) is the positional relationship of the vent hole and vent hole seal part formation part in the process of carrying out a horizontal seal. It is a schematic diagram to explain. (A) It is a top view which shows the modification 1 of a 2nd horizontal seal member. (B) It is a perspective view explaining the process of forming a side edge seal part and a vent hole seal part simultaneously. (C) It is a top view which shows the modification 1 of a packaging bag. (A) It is a top view which shows the modification 2 of a 2nd horizontal seal member. (B) It is a perspective view explaining the process of forming a side edge seal part and a vent hole seal part simultaneously. (C) It is a top view which shows the modification 2 of a packaging bag. (A) It is a top view which shows the modification 3 of a 2nd horizontal seal member. (B) It is a perspective view explaining the process of forming a side edge seal part and a vent hole seal part simultaneously. (C) It is a top view which shows the modification 3 of a packaging bag. It is a top view which shows the modification 4 of a packaging bag. It is a top view which shows the modification 5 of a packaging bag.

Explanation of symbols

1, 1A, 1B, 1C, 1D, 1E ... Packaging bag for cooking (packaging bag), 2, 3 ... Body member, 4 ... Bottom member, 5 ... Side edge seal part, 5a ... Inner edge of side edge seal part , 6 ... Bottom seal part, 7 ... Vent, 8 ... Vent seal part, 8a ... Unsealed or weak seal part, 41, 42 ... Horizontal seal member, 43 ... Side edge seal part forming part, 44 ... Vent seal part forming part, 45 ... film contact surface, 46 ... concave part, 46a ... peripheral edge of the concave part.

Claims (4)

A side edge seal portion is formed by sealing the side edge portions of the pair of body members, and one of the body members is in a position in contact with the inner edge portion of the side edge seal portion or a position inside this position. A vent hole that is perforated, and the vent hole is closed by a vent hole seal part having a shape protruding inward of the packaging bag from an inner edge part of the side edge seal part; The seal strength of the side edge seal portion is smaller than the seal strength of the side edge seal portion, and after the contents are sealed inside, the vent seal portion is peeled off and the vent port is opened when the inside becomes a predetermined pressure or higher. A method of manufacturing a configured packaging bag for heat cooking,
Forming a side edge seal portion by sealing a pair of long belt-like films serving as the body members in a transverse direction that is a direction across the film;
Cutting the mutually sealed films and separating them into individual packaging bags,
The step of forming the side edge seal portion includes:
Sealing only a region corresponding to the side edge seal portion using a first lateral seal member having a side edge seal portion forming portion;
A region corresponding to both the side edge seal portion and the vent seal portion using the second lateral seal member having the side edge seal portion forming portion and the vent seal portion forming portion protruding from the side edge seal portion forming portion. And a process for producing a packaging bag for cooking by heating. The heating and cooking packaging bag has an unsealed or weakly sealed portion around the vent, and a vent seal portion for closing the vent is provided around the unsealed or weakly sealed portion Because
As the second lateral seal member, a seal member having a recess recessed from the film abutting surface in the vent seal portion forming portion and having a peripheral edge of the recess larger than the vent is used. When the lateral seal member is disposed on the body member, the vent is disposed at a position included in the recess to form an unsealed or weakly sealed portion around the vent, and at the same time, The method for producing a packaging bag for cooking according to claim 1, wherein the vent seal part is formed around a seal or weak seal part.   The concave portion of the vent seal portion forming portion has a tapered inner surface whose depth from the film contact surface gradually increases from the peripheral edge of the concave portion. A method of manufacturing a packaging bag. In the cooking bag for cooking, the bottom member folded inward is interposed between the lower parts of a pair of body members, and the bottom edge of the opposing surface where the body member and the bottom member face each other The bottom seal part is formed by sealing the parts,
Prior to the side edge seal portion forming step,
A step of interposing a long band-shaped film serving as the bottom member between a pair of long band-shaped films serving as the body member;
Forming the bottom seal portion by sealing the long body member and the bottom member in the longitudinal direction along the longitudinal direction of the film;
The manufacturing method of the packaging bag for heat cooking in any one of Claim 1 thru | or 3 characterized by the above-mentioned.

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