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WO2025205819A1 - Sac d'emballage - Google Patents

Sac d'emballage

Info

Publication number
WO2025205819A1
WO2025205819A1 PCT/JP2025/011819 JP2025011819W WO2025205819A1 WO 2025205819 A1 WO2025205819 A1 WO 2025205819A1 JP 2025011819 W JP2025011819 W JP 2025011819W WO 2025205819 A1 WO2025205819 A1 WO 2025205819A1
Authority
WO
WIPO (PCT)
Prior art keywords
packaging bag
region
engaging member
central region
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2025/011819
Other languages
English (en)
Japanese (ja)
Inventor
松来 曹
建聡 馬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyoraku Co Ltd
Original Assignee
Kyoraku Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyoraku Co Ltd filed Critical Kyoraku Co Ltd
Publication of WO2025205819A1 publication Critical patent/WO2025205819A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/01—Ventilation or drainage of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package

Definitions

  • the present invention relates to a self-standing packaging bag for microwave ovens, made from flexible film formed into a bag shape.
  • Patent Document 1 discloses a packaging bag for use in a microwave oven that has an openable and closable latch.
  • Patent Document 1 makes it possible to heat any content by opening the joint and placing the content to be heated inside the packaging bag.
  • steam generated when the contents are heated is released to the outside through a steam release seal provided on the folded flap (folded portion).
  • the present invention was made in light of these circumstances, and provides a microwaveable packaging bag that uses a simple structure without the need for folded flaps (folded portions) and that can reliably and effectively release steam generated when the contents are heated.
  • a packaging bag for use in a microwave oven made of a flexible film formed into a bag shape, the packaging bag having a peripheral surface portion, the peripheral surface portion having first and second surfaces facing each other, an opening that opens upward, and an opening/closing member configured to open and close the opening, the opening/closing member having a pair of engaging members consisting of a first engaging member and a second engaging member, the first engaging member being heat-sealed to the first surface, and the upper and lower sides of the region where the second engaging member faces the second surface, sandwiching the engaging position with the first engaging member, are defined as the upper region and the lower region, respectively, the upper region has a portion where the welding strength per unit width between the second engaging member and the second surface is relatively small, and in a region that overlaps in the vertical direction with the portion in the lower region, the second engaging member and the second surface are not heat-sealed or are heat-sealed so that the welding strength per unit width is smaller than
  • microwave-safe packaging bags do not require the addition of flaps (gable portions) in a folded shape, and instead use a simple structure to reliably and effectively release steam generated when the contents are heated. Therefore, microwave-safe packaging bags can be manufactured even using a bag-making machine that does not have the functionality to add flaps (gable portions) to packaging bags.
  • FIG. 1 is a perspective view of a packaging bag 1 according to a first embodiment of the present invention, with contents contained therein.
  • 2 is a plan view of the packaging bag 1 of FIG. 1.
  • FIG. 3A is a cross-sectional view taken along line AA in FIG. 2
  • FIG. 3B is an enlarged view of region B in FIG. 3A
  • FIG. 3C shows the state in which the opening/closing member 23 in FIG. 3B is open.
  • 10A and 10B are views showing the welded state of an upper region 23a3 and a lower region 23a4 of a base 23a1 of a front side engaging member 23a.
  • Fig. 5A is a side view of the peripheral wall film 20b
  • Fig. 5A is a side view of the peripheral wall film 20b
  • FIG 5B is a diagram showing a state in which a part of the peripheral wall film 20b has been cut and the bottom film 20a has been inserted into the cut portion.
  • Figure 6A is a diagram showing how the peripheral wall film 20b and the bottom film 20a are welded together to manufacture the packaging bag 1
  • Figure 6B is a diagram showing the state in which the opening and closing member 23 has been inserted between the front portion 3 and the back portion 4.
  • Figure 7A shows the state in which the front side seal bar 10a and the rear side seal bar 10b are used to weld the peripheral wall film 20b, the front side engaging member 23a, and the rear side engaging member 23b
  • Figure 7B is an oblique view showing the general configuration of the front side seal bar 10a.
  • Figure 8A is a diagram explaining the contact state between the front seal bar 10a and the peripheral wall film 20b in the upper region 23a3
  • Figure 8B is a diagram explaining the contact state between the front seal bar 10a and the peripheral wall film 20b in the lower region 23a4
  • Figure 8C is a diagram showing the welding state in the upper region 23a3 and lower region 23a4 of the base 23a1 of the front engagement member 23a.
  • 9A is a cross-sectional plan view of the vicinity of the opening/closing member 23 showing the state in which heated steam is discharged from the packaging bag 1
  • FIG. 9B is a cross-sectional side view showing the state in which heated steam is discharged from the packaging bag 1.
  • FIG. 9A is a cross-sectional plan view of the vicinity of the opening/closing member 23 showing the state in which heated steam is discharged from the packaging bag 1
  • FIG. 9B is a cross-sectional side view showing the state in which heated steam is discharged from the packaging bag 1.
  • FIG. 10 is a perspective view of a packaging bag 1 according to another embodiment of the present invention, in which an opening/closing portion 24 is provided on the upper side of an opening/closing member 23 .
  • FIG. 10 is a diagram showing another embodiment of the present invention in which a fixed portion S5 is provided between a strong seal area S1 and a weak seal area S2.
  • packaging bag 1 in this embodiment of the present invention is a free-standing packaging bag for use in a microwave oven, in which a flexible film is formed into a bag shape.
  • Packaging bag 1 has a bottom portion 2 and a peripheral portion 21 extending from bottom portion 2.
  • Peripheral portion 21 has a front portion 3 and a back portion 4 facing each other, and an opening 22 that opens upward.
  • Front portion 3 and back portion 4 are welded to each other at their left and right ends (hereinafter also referred to as side ends).
  • Bottom portion 2 is welded (heat sealed) to front portion 3 and back portion 4. In this way, the bottom portion 2, front portion 3, and back portion 4 are welded to each other, forming the film into a bag shape.
  • the top, bottom, left, and right of Figure 2 will be described as the top, bottom, left, and right of the packaging bag 1.
  • the bottom surface 2 side will be the lower side
  • the front surface 3 (and back surface 4) side will be the upper side.
  • the left and right sides when the front surface 3 is placed in front will be the left and right sides of the packaging bag 1.
  • the front surface 3 side will be the front side
  • the back surface 4 side will be the rear side.
  • an opening/closing member 23 is provided on the peripheral surface 21 of the packaging bag 1.
  • the opening/closing member 23 is configured to be able to open and close the opening 22.
  • the opening/closing member 23 includes a front-side engaging member 23a and a rear-side engaging member 23b that can engage with each other.
  • the front-side engaging member 23a is fixed to the inner surface of the front portion 3.
  • the rear-side engaging member 23b is fixed to the inner surface of the rear portion 4. The welded state between the front-side engaging member 23a and the front portion 3, and the fixed state (welded state) between the rear-side engaging member 23b and the rear portion 4 will be described later.
  • the front-side engaging member 23a has a base 23a1 and a hook portion 23a2 protruding from the base 23a1.
  • the rear-side engaging member 23b has a base 23b1 and a hook portion 23b2 protruding from the base 23b1.
  • Base 23a1 is fixed to front surface 3 via upper region 23a3 and lower region 23a4.
  • Base 23b1 is fixed to back surface 4 via upper region 23b3 and lower region 23b4.
  • Hook portions 23a2 and 23b2 can be engaged and disengaged with each other.
  • opening 22 is closed when hook portions 23a2 and 23b2 are engaged, and opening 22 is opened when hook portions 23a2 and 23b2 are disengaged from each other as shown in Figure 3C.
  • the upper regions 23a3, 23b3 and the lower regions 23a4, 23b4 are respectively positioned above and below the engagement position between the front-side engaging member 23a and the rear-side engaging member 23b (the engagement position of the hook portions 23a2, 23b2).
  • the base 23a1 is heat-sealed to the front surface 3 in strong seal regions S1 (corresponding to the upper end regions) on both sides of the packaging bag 1, excluding the center in the left-right direction.
  • the base 23a1 is weakly welded to the front surface 3 in a weak seal region S2 (corresponding to the upper center region) in the center.
  • the weak seal region S2 is configured so that the weld strength per unit width is smaller than that of the strong seal region S1, so that it can be peeled off by the steam pressure generated when the contents of the packaging bag 1 are heated.
  • the base portion 23a1 is heat-sealed to the front surface portion 3 in strong seal regions S3 (corresponding to the lower end regions) at both left and right ends of the packaging bag 1. Furthermore, the base portion 23a1 is not welded to the front surface portion 3 in the unsealed region S4 (corresponding to the lower central region) sandwiched between the strong seal regions S3.
  • the left-right length of the strong seal area S3 roughly corresponds to the weld width of the left-right ends of the front and back sections 3 and 4 (the left-right length of the side edge welds 12, described below). Therefore, an unsealed area S4 is provided across the entire left-right area of the inside of the packaging bag 1.
  • the configurations of the strong seal area S3 and the unsealed area S4 are not limited to those shown in Figure 4.
  • the unsealed area S4 is intended to apply a concentrated force in the peeling direction to the weak seal area S2 when the packaging bag 1 is heated, so the left-right length of the unsealed area S4 only needs to be greater than the left-right length of the weak seal area S2.
  • the unsealed area S4 is positioned so as to overlap the weak seal area S2 in the vertical direction, and is configured to be wider than the weak seal area S2 in the horizontal direction. Considering the need to efficiently apply a peeling force to the weak seal area S2 when the packaging bag 1 expands due to the pressure of the heated steam, it is preferable that the horizontal length of the unsealed area S4 be at least 1.5 times the horizontal length of the weak seal area S2.
  • the horizontal length of the unsealed area S4 can be, for example, 1.5 to 5 times the horizontal length of the weak seal area S2.
  • the horizontal length of the unsealed area S4 can be, for example, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, or 5 times the horizontal length of the weak seal area S2, or it can be any ratio within a range between any two of the numerical values exemplified here.
  • the unwelded portion in the unsealed region S4 is preferably provided so as to extend from the lower end of the base 23a1 to the upper end of the hook 23a2.
  • the base 23a1 is preferably welded to the front surface 3 only in the portion above the hook 23a2.
  • the base portion 23b1 is fixed to the back portion 4 via the upper region 23b3 and the lower region 23b4.
  • the base portion 23b1 is heat-sealed to the back portion 4 over the entire left-right area of the packaging bag 1 in the upper region 23b3 and the lower region 23b4.
  • the heat-sealing between the base portion 23b1 and the back portion 4 is similar to the heat-sealing in the strong seal region S1 described above.
  • the rear-side engaging member 23b corresponds to the first engaging member of the present invention
  • the front-side engaging member 23a corresponds to the second engaging member of the present invention
  • the rear portion 4 corresponds to the first surface
  • the front portion 3 corresponds to the second surface.
  • this is not limited to this, and the present invention can be suitably implemented even if the front-side configuration and the rear-side configuration are interchanged.
  • Figure 2 is a diagram showing the packaging bag 1 in a plan view.
  • Plant view means that the packaging bag 1 is flattened without any contents inside and viewed from a direction perpendicular to the front surface 3 of the packaging bag 1.
  • the packaging bag 1 is formed so as to be symmetrical with respect to the center line in the left-right direction.
  • the vertical length H1 of the packaging bag 1 can be, for example, 12 to 25 cm.
  • H1 include 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 20, 20.5, 21, 21.5, 22, 22.5, 23, 23.5, 24, 24.5, and 25 cm, and may be within a range between any two of the values exemplified here.
  • the side edges of the packaging bag 1 are provided with side edge welds 12 that weld the front portion 3 and the back portion 4 together. This secures the front portion 3 and the back portion 4 in the front-to-rear direction. Furthermore, the bottom edge of the packaging bag 1 is provided with bottom edge welds 13 that weld the bottom portion 2 to the front portion 3, and the bottom portion 2 to the back portion 4.
  • the lower end welded portion 13 is the area below the center line E, and welds the bottom portion 2 to the front portion 3, and the bottom portion 2 to the back portion 4 at the side and bottom ends of the packaging bag 1 (areas surrounded by dashed lines in Figure 2).
  • one peripheral wall film 20b is folded.
  • the bottom film 20a folded into a V shape, is inserted into the open side of the folded peripheral wall film 20b.
  • the bottom film 20a and peripheral wall film 20b are welded together, and the end opposite the welded portion is cut away to form the bottom portion 2, front portion 3, and back portion 4.
  • an opening/closing member 23 is inserted between the front portion 3 and the back portion 4 near the cutout (near the upper ends of the front portion 3 and the back portion 4), and the opening/closing member 23 is fixed to the inner surface of each of the front portion 3 and the back portion 4.
  • the opening/closing member 23 is inserted after the bottom film 20a and the peripheral wall film 20b are welded, but the opening/closing member 23 may also be inserted before the bottom film 20a.
  • the processes of welding the bottom film 20a and the opening/closing member 23 to the peripheral wall film 20b may be performed separately, or may be performed simultaneously.
  • the front portion 3 and the back portion 4 are welded together to form the side edge welds 12.
  • the opening/closing member 23 is also crushed and welded, forming the strong seal area S3.
  • the bottom film 20a and the peripheral wall film 20b are preferably laminated films having a base layer and a sealant layer, and it is even more preferable that an adhesive layer and a printed layer are provided between the base layer and the sealant layer.
  • the base layer is arranged so that it is exposed on the outer surface of the packaging bag 1, and the sealant layer is arranged so that it is exposed on the inner surface of the packaging bag 1.
  • the sealant layers are welded (heat sealed) together to form a welded portion.
  • the substrate layer is made of a material that is strong and highly impact resistant.
  • materials that can be used for the substrate layer include polyamide, polyolefin, polyethylene, and polyester.
  • the adhesive layer is a layer that adheres the base layer and sealant layer together so that they are laminated together.
  • the sealant layer can be formed from a resin with excellent weldability.
  • the sealant layer can be formed from polyolefin resins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ethylene-propylene block copolymer. More specifically, unstretched polypropylene and linear low-density polyethylene can be used.
  • the film that makes up the sealant layer is preferably one that can be cut linearly in the machine direction.
  • the structure is as follows: base layer: oriented nylon (25 ⁇ m) / printing layer / adhesive layer (dry laminate) / sealant layer: LLDPE (60 ⁇ m).
  • the area for heat-sealing the lower region 23a4 of the front seal bar 10a includes a strong seal region 10a1 and an unsealed region 10a2.
  • the unsealed region 10a2 is positioned in a position that corresponds to the entire left-right area of the inside of the packaging bag 1.
  • the unsealed region 10a2 is configured to be approximately 1.0 mm lower in height than the strong seal region 10a1.
  • the difference in height between the unsealed region 10a2 and the strong seal region 10a1 is, for example, 0.8 or more.
  • the welding strength per unit width in the strong seal areas S1 and S3 of the upper region 23a3 shown in Figure 8C be, for example, a peel strength according to JIS K6854 of approximately 20 N/15 mm width.
  • the peel strength is, for example, 15 to 30 N/15 mm width, specifically, for example, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 N/15 mm width, and may be within a range between any two of the values exemplified here.
  • the tearing section 24 may also have another configuration that enables the packaging bag 1 to be opened.
  • the cut lines 24b instead of the cut lines 24b, half-cut lines extending in the circumferential direction of the peripheral surface portion 21 may be provided, or a strip of film may be arranged so as to extend in the circumferential direction of the peripheral surface portion 21.
  • the strip of film is welded to the peripheral surface portion 21, and by grasping and pulling the end of the strip of film, it is possible to tear the peripheral surface portion 21 along the strip of film.
  • the peripheral surface portion 21 may have a pair of side surfaces between the front surface portion 3 and the rear surface portion 4. In this case, the front surface portion 3 and the rear surface portion 4 are welded to the pair of side surfaces, respectively, to form the peripheral surface portion 21 having a substantially rectangular shape.
  • the bottom surface portion 2 is made of a film folded into a V-shape, but this is not limited to this form and may be made of a film folded into a W-shape, for example.
  • the method for manufacturing the packaging bag 1 is not limited to the method described in the above embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Bag Frames (AREA)

Abstract

La présente invention concerne un sac d'emballage pour fours à micro-ondes grâce auquel de la vapeur générée lors du chauffage du contenu dudit sac peut être évacuée à l'air libre de manière fiable et appropriée au moyen d'une configuration simple, sans qu'il soit nécessaire de fournir des rabats façonnées en forme de paumes pressées (section de paumes pressées).　Selon la présente invention, un sac d'emballage est fourni, lequel comprend, dans sa surface périphérique, des première et deuxième surfaces qui se font face, une ouverture qui est ouverte vers le haut et un élément d'ouverture/fermeture configuré pour ouvrir/fermer l'ouverture, l'élément d'ouverture/fermeture ayant un premier élément de mise en prise et un deuxième élément de mise en prise, et définissant une région supérieure et une région inférieure comme étant des régions où le deuxième élément de mise en prise fait face à la deuxième surface, la région supérieure comprend une portion où la force d'étanchéité par unité de largeur entre le deuxième élément de mise en prise et la deuxième surface est relativement petite, et dans une région de la région inférieure qui chevauche ladite portion dans la direction verticale, le deuxième élément de mise en prise et la deuxième surface ne sont pas thermoscellés, ou sont thermoscellés avec une force d'étanchéité par unité de largeur inférieure à celle de ladite portion.
PCT/JP2025/011819 2024-03-29 2025-03-25 Sac d'emballage Pending WO2025205819A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202410381067.8 2024-03-29
CN202410381067.8A CN120717060A (zh) 2024-03-29 2024-03-29 包装袋

Publications (1)

Publication Number Publication Date
WO2025205819A1 true WO2025205819A1 (fr) 2025-10-02

Family

ID=97168148

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2025/011819 Pending WO2025205819A1 (fr) 2024-03-29 2025-03-25 Sac d'emballage

Country Status (2)

Country Link
CN (1) CN120717060A (fr)
WO (1) WO2025205819A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006315760A (ja) * 2005-05-12 2006-11-24 Illinois Tool Works Inc <Itw> 再閉鎖可能な包装体
JP2014012552A (ja) * 2012-07-05 2014-01-23 Seisan Nipponsha:Kk 減圧弁付き包装用袋
WO2017119449A1 (fr) * 2016-01-07 2017-07-13 出光ユニテック株式会社 Bande de fermeture à glissière, sac, et procédé de production de sac

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006315760A (ja) * 2005-05-12 2006-11-24 Illinois Tool Works Inc <Itw> 再閉鎖可能な包装体
JP2014012552A (ja) * 2012-07-05 2014-01-23 Seisan Nipponsha:Kk 減圧弁付き包装用袋
WO2017119449A1 (fr) * 2016-01-07 2017-07-13 出光ユニテック株式会社 Bande de fermeture à glissière, sac, et procédé de production de sac

Also Published As

Publication number Publication date
CN120717060A (zh) 2025-09-30

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