EP0795482A2 - Sac d'emballage pour produit alimentaire - Google Patents

Sac d'emballage pour produit alimentaire Download PDF

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Publication number
EP0795482A2
EP0795482A2 EP97103953A EP97103953A EP0795482A2 EP 0795482 A2 EP0795482 A2 EP 0795482A2 EP 97103953 A EP97103953 A EP 97103953A EP 97103953 A EP97103953 A EP 97103953A EP 0795482 A2 EP0795482 A2 EP 0795482A2
Authority
EP
European Patent Office
Prior art keywords
bag
food product
air discharge
synthetic resin
guide
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.)
Withdrawn
Application number
EP97103953A
Other languages
German (de)
English (en)
Other versions
EP0795482A3 (fr
Inventor
Shuzo Nakagawa
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.)
Fuji Techno Co Ltd
Original Assignee
Fuji Techno 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
Priority claimed from JP08332596A external-priority patent/JP3717992B2/ja
Priority claimed from JP08332696A external-priority patent/JP3717993B2/ja
Priority claimed from JP13111596A external-priority patent/JP3717999B2/ja
Application filed by Fuji Techno Co Ltd filed Critical Fuji Techno Co Ltd
Publication of EP0795482A2 publication Critical patent/EP0795482A2/fr
Publication of EP0795482A3 publication Critical patent/EP0795482A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • B65D81/3446—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 specially adapted to be heated by microwaves
    • B65D81/3461—Flexible containers, e.g. bags, pouches, envelopes
    • 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
    • B65D2205/00—Venting means
    • B65D2205/02—Venting holes
    • 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
    • B65D2581/00—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
    • B65D2581/34—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
    • B65D2581/3437—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 specially adapted to be heated by microwaves

Definitions

  • the present invention relates to a food product packaging bag which is adapted to accommodate a frozen food product such as a meat bun, a bean jam bun, a shao-mai, a hamburger steak, a broiled eel and the like and which is capable of being subjected to a cooking in a food product-packaging state in a microwave oven.
  • a frozen food product such as a meat bun, a bean jam bun, a shao-mai, a hamburger steak, a broiled eel and the like and which is capable of being subjected to a cooking in a food product-packaging state in a microwave oven.
  • a food product such as a meat bun or the like contained in the conventional packaging bag is incapable of being cooked in a packaged state to provide good taste. Therefore, it is a conventional practice to remove such a meat bun product from the packaging bag and then heat it with steam in a steaming basket for eating, or to moisten a meat bun product with water; wrap it with a polyethylene film and cook it under heating in a microwave oven.
  • the conventional food product packaging bag suffers from the following problem: the food product contained in such packaging bag is incapable of being cooked in the packaged state by heating to provide good taste, or it is necessary to remove the food product from the package one by one because there is a danger such as bursting, resulting in much labor required.
  • a food product packaging bag comprising a bag body made of a synthetic resin film, and an air discharge means adapted to ensure that when the internal pressure in the bag exceeds a predetermined level, air is discharged to prevent the internal pressure in the bag from being risen more than a given value.
  • the air discharge means is a zigzag air discharge passage which is formed by heat-fusing of opposed inner surfaces of the bag body made of the synthetic resin film.
  • the air discharge means is a tubular member including a zigzag air discharge passage which is formed by heat-fusing of opposed inner surfaces of the tubular member made of the synthetic resin film.
  • a food product packaging bag comprising a bag body made of a synthetic resin film, an air discharge means provided in the bag body for discharging air in the bag, a first opening means used to put the inside and outside of the bag into communication with each other by the air discharge means, and a second opening means used to take out a food product in the bag.
  • the air discharge means has an air discharge passage having a predetermined length and formed by heat-fusing of opposed inner surfaces of the bag body made of the synthetic resin film.
  • the first opening means comprises a guide which is heat-fused to the synthetic resin film to extend to opposite sides of the bag body, including an opening of an air discharge port of the air discharge means, and a cutout provided in the side of the bag body between the guide and the air discharge means.
  • the synthetic resin film is a laminate film made by laminating, to an inner side of a nylon film, a low-density polyethylene film or unstretched polypropylene film, or a laminate film made by further laminating, to an outer side of the nylon film, a silica-deposited polyethylene terephthalate film or an oxidized aluminum-deposited polyethylene terephthalate film.
  • a food product packaging bag comprising a bag body made of synthetic resin film, and a band-like guide provided between the folded and superposed synthetic resin film, so that a food product is accommodated in the bag body, the food product packaging bag further including an air discharge passage formed between at least one surface of the guide and the synthetic resin film.
  • only the one surface of the guide is heat-fused to the synthetic resin film to form the air discharge passage between the other surface of the guide and the synthetic resin, so that the inside of the bag body is permitted to communicate with the outside by the air discharge passage.
  • all of one surface and a portion of the other surface of the guide are heat-fused to the synthetic resin film to form an air discharge passage between the non-fused portion of the other surface of the guide and the synthetic resin film, so that the inside of the bag body is permitted to communicate with the outside by the air discharge passage.
  • the bag further includes an opening for enabling a food product in the bag to be taken out is formed by cutting away the guide from the bag body.
  • an air discharge valve portion provided in the bag and formed by partially heat-fusing the superposed synthetic resin films to each other, so that the inside of the bag body is permitted to communicate with the air discharge passage by the air discharge valve portion.
  • a portion of the guide is not heat-fused to the synthetic resin film to form an air discharge passage between such portion and the synthetic resin film, the air discharge passage being formed so that the inside of the bag body is put into communication with the outside by cutting away a portion of the bag body along the guide.
  • the bag further includes an opening for enabling a food product in the bag to be taken out by cutting away the guide from the bag body.
  • the bag further includes a sealing means for sealing an air discharge port of the air discharge means, wherein the sealing means is opened when it is heated.
  • the synthetic resin film may be any of those which have a heat resistance enough to withstand the heating and cooking of a food product contained in the bag in a microwave oven. It is preferable that the synthetic resin film further has a resistance to the cold during freezing. More specifically, it is preferable that the synthetic resin film is a laminate film made by laminating a low-density polyethylene film or an unstretched polyethylene film to an inner side of a nylon film. For a retort food product, it is preferable that the synthetic resin film is a laminate film made by further laminating a silica-deposited polyethylene terephthalate film or an oxidized aluminum-deposited polyethylene terephthalate film to an outer side of the nylon film.
  • the bag body can be made by folding a single sheet of synthetic resin film to heat-seal the side portions thereof. But it is also possible to made the bag body by superposing two sheets of synthetic resin films to heat-seal the side portions thereof.
  • the air discharge means preferably has an air discharge passage having a predetermined length, so that a predetermined air flow resistance is provided.
  • an air discharge passage is formed so that an internal pressure near a condition provided during steaming of the meat bun is consequently provided.
  • the taste of the cooked hamburger steak product can be enhanced by increasing the internal pressure in the bag.
  • the length, width or shape of the air discharge passage is properly selected depending upon the type of a food product packaged in the bag and the type of a cooking method such as a simple heat-cooking, a steam-cooking and the like.
  • the air discharge means for ensuring that when the internal pressure in the bag exceeds a predetermined level, air is discharged to prevent the internal pressure from being risen beyond a given internal pressure may be formed into a so-called air discharge valve structure which is capable of maintaining the given internal pressure.
  • a zigzag air-discharge passage is formed by heat-fusing opposed inner surfaces of the bag body formed of synthetic resin films to each other.
  • the air discharge means is a tubular member having a zigzag air-discharge passage formed by heat-fusing opposed inner surfaces of the tubular member made of the synthetic resin film
  • the air discharge means can be provided in the bag only by mounting the tubular member to any of bags having various shapes and sizes. Therefore, it is preferable for manufacture of the food product packaging bag that such a tubular member is used as an air discharge means.
  • a suitable water source may be contained in the bag along with the food product.
  • the food product packaging bag may be further packed with another outer packing bag for the purpose of insuring the sanitation of a food product.
  • a bag article may be prepared in a state in which only the bottom of the bag is not heat-sealed, and the bag article in this state may be delivered to a food product maker.
  • a food product may be placed into the bag article and then, the bottom may be heat-sealed, thereby completing the packaging.
  • the food product packaging bag containing the meat bun may be subjected, as it is, to a cooking in a microwave oven. Then, the meat bun in the bag is heated, and air in the bag is expanded, while at the same time, water vapor is generated. As a result, the inside of the bag is brought into the same state as in a steaming basket, and the internal pressure in the bag is risen up to a given level and maintained at this given level. If the internal pressure in the bag is intended to be further risen, the air in the bag is discharged through the air discharge means. In this manner, the meat bun is cooked into a good taste, as in a case where it is cooked in a steaming basket.
  • the inside and outside of the bag can be put into communication with each other by the air discharge means by cutting away a portion of the bag by use of the first opening means. If the food product packaging bag in this state is subjected to a heat-cooking, the air in the bag is properly discharged and hence, there is no danger of rising of the internal pressure in the bag up to an abnormal level. After completion of the heat-cooking, the bag can be opened by use of the second opening means to take out the food product. Therefore, according to the present invention, the food product can be protected in a completely sealed state in the packaging bag, when it is in a preserved state in the course of distribution, and the food product in the packaging bag can be heat-cooked in a microwave oven.
  • the first opening means ensures that the air discharge port of the air discharge means can be reliably unsealed by provision of the guide in addition to the cutout.
  • the air discharge port can be opened when heat-cooked in a microwave oven.
  • the air in the bag can be discharged to the outside as required during heating of the bag in the microwave oven, by provision of the air discharge passage formed between the superposed synthetic resin films and at least one surface of the band-like guide provided between the superposed synthetic resin films.
  • the air discharge passage may be formed between the other surface of the guide and the synthetic resin film.
  • the communication permitted between the inside of the bag and the outside by the air discharge passage ensures that if the internal pressure in the bag is risen, the air in the bag can be passed through the air discharge passage along the guide and discharged to the outside.
  • the air discharge passage may be formed between the synthetic resin film and the non-fused portion of the other surface of the guide.
  • a heat-fused portion may be provided on that surface of the synthetic resin film which is located inside of the bag along the guide, excluding the outer periphery of the bag, because the other surface of the guide has a portion heat-fused to the synthetic resin film. Therefore, the opening for enabling the food product in the bag to be taken out can be formed by cutting away the guide from the bag.
  • the guide forms the air discharge passage permitting the communication of the inside of the bag with the outside. Therefore, when the internal pressure in the bag is risen, the air in the bag can be discharged to the outside by provision of the air discharge passage permitting the communication of the inside of the bag with the outside, and the guide can be used for opening of the bag.
  • the internal pressure in the bag during heating can be finely regulated by provision of the air discharge valve portion permitting the communication of the inside of the bag with the outside by partially heat-fusing the opposed inner surfaces of the bag body made of the superposed synthetic resin films.
  • a food product can be cooked into a good taste by regulating the internal pressure during heating depending upon the type of the food product.
  • the air discharge passage may be formed at that portion of the guide which is not heat-fused to the synthetic resin film.
  • Such air discharge passage can be formed into a configure permitting the communication of the inside of the bag with the outside by cutting away a portion of the bag along the guide. With such configure, the sealability of the inside of the bag can be insured, and the bag, as it is, can be put into the distribution. If the internal pressure in the bag is risen during heating and cooking of the food product contained in the bag, the air in the bag can be discharged to the outside through the air discharge passage.
  • the guide forms the air discharge passage permitting the communication of the inside of the bag with the outside. Therefore, when the internal pressure in the bag is risen, the air in the bag can be discharged to the outside by provision of the air discharge passage permitting the communication of the inside of the bag with the outside, and the guide can be used for opening of the bag.
  • the bag 20 is formed by a laminate film (a synthetic resin film) 10 which is formed by laminating, in a dry manner, a barrier-like nylon film having a thickness of 15 ⁇ m to an outer side of a linear low-density polyethylene (LLDPE) film having a thickness of 40 ⁇ m.
  • a laminate film (a synthetic resin film) 10 which is formed by laminating, in a dry manner, a barrier-like nylon film having a thickness of 15 ⁇ m to an outer side of a linear low-density polyethylene (LLDPE) film having a thickness of 40 ⁇ m.
  • LLDPE linear low-density polyethylene
  • the bag 20 is formed into a size of 23 cm length ⁇ 18 cm width by the synthetic resin film 10, so that four sides of the bag 20 are heat-sealed in a state in which it has contained a hamburger steak 100 therein. In a state before the bag contains the hamburger steak, only three sides of the bag 20 are heat-sealed, and a bottom of the bag remains open without being heat-sealed to serve as an inlet through which the hamburger steak is accommodated into the bag.
  • the air discharge means 30 for discharging air within the bag 20 is provided in the vicinity of the upper side of the bag 20.
  • the air discharge means 30 includes a zigzag-shaped air discharge passage 30A having a predetermined length and formed by heat-fusing opposite surfaces of the synthetic resin film 10 forming the bag to each other.
  • the air discharge passage 30A is comprised of a zigzag passage portion 30F formed by a heat fusing line 30C forming a recess 30B and a heat-fusing line 30E forming a projection 30D, and an aid discharge port 30G connected to the zigzag passage portion 30F and formed so that it is gradually spread toward a top.
  • a guide 40 is provided at an upper portion of the air discharge port 30G to extend to the opposite sides of the bag 20. Opposite surfaces of the guide 40 are heat-fused to the synthetic resin film.
  • a cutout 50A is provided in the side of the bag 20 between the guide 40 and the air discharge means 30. In this case, a first opening means is constituted by the guide 40 and the cutout 50A.
  • a cutout 50B forming a second opening means is provided in the side of a lower portion of the bag 20.
  • the food packaging bag maintained in a preserved state in the course of the distribution is in a state shown in Fig.1, wherein the inside of the bag 20 is kept in a sealed state.
  • a first opening is carried out from the cutout 50A along the guide 40.
  • the guide 40 and a heat-sealed portion of the bag 20 located above the guide 40 are cut away, thereby opening the air discharge port 30G.
  • Fig.2 shows the air discharge port 30G in its opened state.
  • a second opening is carried out by use of the cutout 50B, and the food product, i.e., hamburger steak 100 is taken out from the bag 20.
  • Fig.4 shows the bag in a state after completion of the second opening.
  • the cutout 50B as the second opening means has been described as being provided in the lower portion of the bag 20 in the above embodiment, but the cutout 50B may be provided in the vicinity of a lower portion of the air discharge means 30, so that the air discharge means 30 may be cut away by use of the second opening means.
  • a meat bun was placed into the bag 20 formed as described above and was then heated for 2 to 5 minutes in a microwave oven (high frequency output power of 500 W). As a result, vapor was generated in the bag 20, and the bag 20 was brought into a steamed state similar to that in a so-called steaming basket. When the internal pressure in the bag 20 reached a given level, air started leaking through the air discharge port 30G. In this manner, the cooking could be finished without bursting of the bag.
  • a frozen food product of broiled eel was placed into the bag 20 and cooked likewise in the microwave oven. The result showed that the frozen food product of broiled eel was cooked into good taste, as was the meat bun.
  • Figs.5 and 6 illustrate a second embodiment of a food product packaging bag according to the present invention.
  • an air discharge means is configured as shown in Fig.5.
  • a tubular member 21 was formed using a synthetic resin film 10 as in the previous embodiment. Opposed inner surfaces of the tubular member 21 made of the synthetic resin film 10 were heat-fused to each other at one end of the tubular member 21 to form an air discharge means 31 comprised of a zigzag air-discharge passage 30A of the same shape as in the previous embodiment and the like. Portions having the same function as those in the previous embodiment are designated by like reference characters, and the description of them is omitted.
  • the air discharge means 31 comprising the tubular member 21 is provided so that an air discharge port 30G of the air discharge means 31 communicates with the outside of the bag 20 when the synthetic resin film 10 is heat-sealed to form a bag 20, as shown in Fig.6.
  • the bag can be produced in a usual manufacture line only by mounting an attachment for supplying the tubular member to a horizontal pillow-type bag making machine.
  • a meat bun and a frozen food product of broiled eel were placed into the bags 20 according to the second embodiment, respectively and heat-cooked in a microwave oven in the same manner as in the previous embodiment.
  • the result showed that both of the meat bun and the frozen food product of broiled eel were cooked into a good taste without bursting of the bags 20.
  • a third embodiment of a food product packaging bag according to the present invention will be described below with reference to Figs.7 to 9.
  • a band-like or zonation guide 41 is provided in the vicinity of a top side of the bag 20 to extend to opposite sides of the bag 20.
  • One surface of the guide 41 is heat-fused to a synthetic resin film, and the other surface of the guide 41 is not heat-fused to form an air discharge passage 31 between the other surface of the guide 41 and the synthetic resin film 10, as shown in Fig.9.
  • An air discharge port 31G is provided in an upper and central portion of the inside of the bag 20 for permitting the communication between the inside of the bag 20 and the air discharge passage 31 formed by the guide 41.
  • the air discharge port 31G is formed so that it is gradually spread toward its top.
  • a food product contains water therein and hence, if the food product is heat-cooked in the microwave oven, water contained in the food product is vaporized, and air in the bag is expanded to rise the internal pressure in the bag. At this time, the expanded air is passed through the air discharge port 31G to the guide 41. Therefore, the air discharge passage 31 is formed in a manner that the synthetic resin film 10 and the non-fused surface of the guide 41 which is in close contact with the synthetic resin film in a usual state are forced away from each other by the introduced air to form the air discharge passage 31. This permits the air in the bag 20 to be discharged to the outside. Therefore, the bag 20 cannot be burst.
  • the amount of air discharged to the outside of the bag 20 is influenced by the length and the sectional area of the air discharge passage 31. Therefore, the amount of air discharged can be regulated by changing the width of the guide 41 or the width of the air discharge port 31G on the side of the guide 41, or by changing the position of the air discharge port 31G. Thus, the used synthetic resin film 10 can be prevented from being burst by regulating the amount of air discharged.
  • the internal pressure during heat-cooking of a food product in the microwave oven can be changed, so that a pressure depending upon the type of the food product is applied.
  • a band-like guide 42 is provided in the vicinity of a top side of the bag 20 to extend to opposite sides of the bag 20.
  • One surface of the guide 42 is heat-fused to the synthetic resin 10, and the other surface of the guide 42 is partially heat-fused to the synthetic resin film 10. More specifically, longitudinally upper half of the other surface of the guide 42 is not heat-fused to form an air discharge passage 32 between the longitudinally upper half and the synthetic resin film 10, as shown in Fig.12.
  • An air discharge passage 32A is formed in the lower half of the other surface of the guide 42 for permitting the communication between the inside of the bag 20 and the air discharge passage 32.
  • a cutout 51 is provided in the side of the bag 20 at a location where the guide 42 is heat-fused, so as to extend along the side of the guide 42.
  • Air expanded during heat-cooking of the food product packaging bag is passed through the air discharge passage 32A to the guide 42. Therefore, the air discharge passage 32 is formed in a manner that the synthetic resin film 10 and the non-fused surface of the guide 42 which is in close contact with the synthetic resin film in a usual state are forced away from each other by the introduced air to form the air discharge passage. This permits the air in the bag 20 to be discharged to the outside.
  • the amount of air discharged to the outside of the bag 20 is influenced by the length and the sectional area of the air discharge passage 32. Therefore, the amount of air discharged can be regulated by changing the width of the guide 42 or the width of the heat-fused portion of the guide 42, or by changing the width of the air discharge passage 32A or the position of air discharge passage 32A formed.
  • the guide 42 can be cut away by use of the cutout 51 to take the food product out of the bag 20.
  • a fifth embodiment of a food product packaging bag according to the present invention will be described below with reference to Fig.13.
  • a band-like guide 43 is provided in the vicinity of a top side of the bag 20 to extend to opposite sides of the bag 20.
  • One surface of the guide 43 is heat-fused to the synthetic resin 10, and the other surface of the guide 42 is not heat-fused to the synthetic resin film 10 to form an air discharge passage 32 between the other surface of the guide 42 and the synthetic resin film 10.
  • An air discharge means 30 is provided at an upper and central portion of the inside of the bag 20, as in the first embodiment.
  • the amount of air discharged can be regulated by the fact that the air discharge means 30 is further provided.
  • the used synthetic resin film can be prevented from being burst by regulating the amount of air discharged.
  • the internal pressure in the bag during heat-cooking of a food product in a microwave oven can be changed, so that a pressure depending upon of the type of the food product can be applied.
  • the inside of the bag 10 is not in a completely sealed state, and for this reason, when the food product packaging bag is in a preserved state in the course of distribution, it is necessary to further place the bag 20 into another sealed bag.
  • a sixth embodiment of a food product packaging bag according to the present invention which is capable of being maintained in a sealed state when it is in a preserved state in the course of distribution, will be described with reference to Figs.14 to 16.
  • a synthetic resin film 10 is heat-sealed to form a bag 20 for packaging a food product, as in the previous embodiment.
  • a band-like guide 44 is provided in the vicinity of a top side of the bag 20 to extend to opposite sides of the bag 20, in a manner that it is heat-fused between opposed inner surfaces of the bag made of the synthetic resin 10.
  • One surface of the guide 44 has a portion which is not heat-fused partially widthwise over the entire width. This non-fused portion forms an air discharge passage 33.
  • a space 33A resulting from the non-fusing is provided in the vicinity of the air discharge passage 33 at an upper heat-fused portion of the bag 20 made of the synthetic resin film 10. Cutouts 52A and 52B are provided along opposite sides of the guide 44 in the side of the bag 20 at locations where the guide 44 is heat-fused.
  • Fig.14 shows the food product packaging bag in a preserved state in the course of distribution and the like. In this state, the inside of the bag 20 is kept in a sealed state.
  • the upper heat-fused portion of the bag 20 is cut away from the cutout 52A along the guide 44.
  • the upper heat-fused portion of the bag 20 cannot be unnecessarily completely cut away along the guide, and a heat-sealed portion in the vicinity of the guide may be left in some cases.
  • the air discharge passage 33 communicates with the outside, because the space 33A resulting from the non-fusing is provided the upper heat-fused portion in the vicinity of the air discharge passage 33.
  • the guide 44 can be cut away by use of the cutout 52B, thereby taking out the food product from the bag 20.
  • a food product packaging bag can be kept in its sealed state during preservation in the course of the distribution, but the bag can be opened if it is heated.
  • one of the sides i.e., the upper side to which the air discharge port 30G opens is formed as a sealing means 60 which can be opened when it is heated.
  • Each of the remaining three sides of the synthetic resin films 10 are heat-sealed together as in the previous embodiments, so as to form a bag 20 for receiving a food product.
  • the seal means 60 comprises a heat-resistant film 61 which is made of polyester or the like and is sandwiched between the synthetic resin films 10.
  • the seal means 60 is provided at its opposite surfaces with sealing layers which are made by coextrusion, dry-lamination or coating. The adhesive force or attaching force of the sealing layer with respect to the synthetic resin film 10 and the heat-resistant film 61 is weakened when the sealing layer is heated.
  • Figs.17 and 18 shows the food product packaging bag in a preserved state in the course of distribution and the like. In this state, the inside of the bag 20 is kept in a sealed state.
  • the adhesive force or attaching force of the seal means 60 is weakened by such heat.
  • the pressure within the bag 20 is increased, the expanded air is passed through the air discharge passage 30A and filled in the air discharge port 30G also.
  • the air filled within the air discharge port 30G acts to break the seal between the synthetic resin film 10 and heat-resistant film 61 which constitute the seal means 60. Therefore, the seal means 60 opens, and the air within the bag 20 is discharged to the outside through the air discharge passage 33. Thus, the bag 20 cannot be burst.
  • a food product packaging bag when the food product packaging bag is in a preserved state in the course of distribution, a food product can be protected in a completely sealed state and heat-cooked in a microwave oven by utilizing the packaging bag.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Package Specialized In Special Use (AREA)
EP97103953A 1996-03-12 1997-03-10 Sac d'emballage pour produit alimentaire Withdrawn EP0795482A3 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP83326/96 1996-03-12
JP83325/96 1996-03-12
JP08332596A JP3717992B2 (ja) 1996-03-12 1996-03-12 食品包装用袋
JP08332696A JP3717993B2 (ja) 1996-03-12 1996-03-12 食品包装用袋
JP13111596A JP3717999B2 (ja) 1996-04-26 1996-04-26 食品包装用袋
JP131115/96 1996-04-26

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999032373A1 (fr) * 1997-12-18 1999-07-01 Karl Keller Emballage et procede de cuisson pour aliments
EP0933310A1 (fr) * 1998-01-30 1999-08-04 Ace Package Co., Ltd. Sachet d'emballage pour fours à micro-ondes
US6380524B1 (en) 1999-08-09 2002-04-30 Karl Keller Microwavable food package having valve and method of use
EP1359097A1 (fr) * 2002-04-17 2003-11-05 Wipf AG Sachet comportant une soupape d'équilibrage de pression et procédé de pasteusisation des aliments
US6979494B2 (en) 2002-08-27 2005-12-27 Cryovac, Inc. Dual-ovenable, heat-sealable packaging film
EP2078683A1 (fr) * 2008-01-11 2009-07-15 Unilever N.V. Emballage comportant des moyens de ventilation
CN101171185B (zh) * 2005-04-08 2011-02-02 日和电机株式会社 微波炉用袋体及使用该袋体的加热加压烹饪方法
US7919161B2 (en) 2002-12-18 2011-04-05 Cryovac, Inc. Dual-ovenable, heat-sealable packaging tray
EP2532606A1 (fr) * 2011-06-07 2012-12-12 Mondi AG Sac doté d'une valve et son procédé de fabrication
US20140027446A1 (en) * 2011-01-31 2014-01-30 Ultraperf Technologies Inc. Self venting steam valve for flexible packaging bags and pouches used in cooking of foods
US9988198B2 (en) 2010-08-23 2018-06-05 Cryovac, Inc. Ovenable heat-sealed package
CN108328089A (zh) * 2018-02-22 2018-07-27 江苏申凯包装高新技术股份有限公司 一种能够防爆的微波炉排气袋
CN113104386A (zh) * 2021-01-28 2021-07-13 张天明 一种气封式隔离取料型食品包装袋

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KR101113402B1 (ko) * 2009-11-05 2012-02-29 주식회사 원지 내용물의 유출과 건조 현상을 방지할 수 있는 구조의 내압배출수단이 형성된 전자레인지용 비닐팩.
KR102465714B1 (ko) * 2020-12-29 2022-11-11 주식회사 양지디엔피 수분 저항성이 우수한 포장용 종이상자

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EP0126816A1 (fr) * 1983-05-25 1984-12-05 St. Regis Corporation Sacs, en particulier sacs à parois multiples
JPH01291754A (ja) * 1988-05-20 1989-11-24 Masami Ogata 電子レンジ加熱用調理済み食品の個包装の加熱中に於ける包装内圧力を加圧調節する方法
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EP0126816A1 (fr) * 1983-05-25 1984-12-05 St. Regis Corporation Sacs, en particulier sacs à parois multiples
JPH01291754A (ja) * 1988-05-20 1989-11-24 Masami Ogata 電子レンジ加熱用調理済み食品の個包装の加熱中に於ける包装内圧力を加圧調節する方法
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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6607764B1 (en) 1997-12-18 2003-08-19 Karl Keller Ventable, microwave-safe food package
WO1999032373A1 (fr) * 1997-12-18 1999-07-01 Karl Keller Emballage et procede de cuisson pour aliments
EP0933310A1 (fr) * 1998-01-30 1999-08-04 Ace Package Co., Ltd. Sachet d'emballage pour fours à micro-ondes
US6121597A (en) * 1998-01-30 2000-09-19 Ace Package Co., Ltd. Packaging bag for use in a microwave oven
US6380524B1 (en) 1999-08-09 2002-04-30 Karl Keller Microwavable food package having valve and method of use
EP1359097A1 (fr) * 2002-04-17 2003-11-05 Wipf AG Sachet comportant une soupape d'équilibrage de pression et procédé de pasteusisation des aliments
US6979494B2 (en) 2002-08-27 2005-12-27 Cryovac, Inc. Dual-ovenable, heat-sealable packaging film
US7504158B2 (en) 2002-08-27 2009-03-17 Cryovac, Inc. Dual-ovenable, heat-sealable packaging film
US7919161B2 (en) 2002-12-18 2011-04-05 Cryovac, Inc. Dual-ovenable, heat-sealable packaging tray
CN101171185B (zh) * 2005-04-08 2011-02-02 日和电机株式会社 微波炉用袋体及使用该袋体的加热加压烹饪方法
EP2078683A1 (fr) * 2008-01-11 2009-07-15 Unilever N.V. Emballage comportant des moyens de ventilation
US9988198B2 (en) 2010-08-23 2018-06-05 Cryovac, Inc. Ovenable heat-sealed package
US20140027446A1 (en) * 2011-01-31 2014-01-30 Ultraperf Technologies Inc. Self venting steam valve for flexible packaging bags and pouches used in cooking of foods
US9126734B2 (en) * 2011-01-31 2015-09-08 Ultraperf Technologies Inc. Self venting steam valve for flexible packaging bags and pouches used in cooking of foods
EP2532606A1 (fr) * 2011-06-07 2012-12-12 Mondi AG Sac doté d'une valve et son procédé de fabrication
CN108328089A (zh) * 2018-02-22 2018-07-27 江苏申凯包装高新技术股份有限公司 一种能够防爆的微波炉排气袋
CN113104386A (zh) * 2021-01-28 2021-07-13 张天明 一种气封式隔离取料型食品包装袋
CN113104386B (zh) * 2021-01-28 2022-12-20 杭州神彩包装印业有限公司 一种气封式隔离取料型食品包装袋

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ID16228A (id) 1997-09-11
EP0795482A3 (fr) 1997-11-12

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