WO2021039717A1 - 鮮度保持用袋体の製造方法 - Google Patents

鮮度保持用袋体の製造方法 Download PDF

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Publication number
WO2021039717A1
WO2021039717A1 PCT/JP2020/031841 JP2020031841W WO2021039717A1 WO 2021039717 A1 WO2021039717 A1 WO 2021039717A1 JP 2020031841 W JP2020031841 W JP 2020031841W WO 2021039717 A1 WO2021039717 A1 WO 2021039717A1
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WIPO (PCT)
Prior art keywords
film
bag
bag body
width
freshness
Prior art date
Application number
PCT/JP2020/031841
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English (en)
French (fr)
Inventor
渡辺　徹
Original Assignee
株式会社Ｗ
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Publication date
Application filed by 株式会社Ｗ filed Critical 株式会社Ｗ
Priority to EP20859503.3A priority Critical patent/EP4019418A4/en
Priority to US17/637,386 priority patent/US11951691B2/en
Publication of WO2021039717A1 publication Critical patent/WO2021039717A1/ja

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    • B29C66/8511—Bag making machines
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    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/01—Ventilation or drainage of bags
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    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
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    • B29C65/087—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using both a rotary sonotrode and a rotary anvil
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    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/735—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the extensive physical properties of the parts to be joined
    • B29C66/7352—Thickness, e.g. very thin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B31B70/644—Making seals parallel to the direction of movement, i.e. longitudinal sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B31B70/649—Uniting opposed surfaces or edges; Taping by applying heat or pressure using tools mounted on a drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/41—Opaque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/46—Bags

Definitions

  • the present invention relates to a method for producing a bag for maintaining freshness, and more particularly to a method for producing a bag for maintaining freshness, which can suppress a decrease in freshness of foods and fresh flowers that generate carbon dioxide during storage due to respiration or fermentation. ..
  • Foods that generate carbon dioxide by breathing or fermentation such as vegetables, fruits, fresh flowers, coffee beans, processed foods, etc., can be stored in a bag that can be stored fresh, or fresh flowers can be stored for a long period of time.
  • the need for bags is increasing.
  • the bag that stores the above foods for a long period of time is required to have two contradictory functions: emission of carbon dioxide and water vapor generated inside and prevention of inflow of oxygen from the outside. This is because if the emission of carbon dioxide and water vapor is insufficient, the internal pressure may rise and the bag body may be damaged, and if the inflow of oxygen is not prevented, the freshness of the contents will decrease due to oxidation.
  • a fruit and vegetable package in which a non-joint portion arranged in a stripe shape is provided in the heat-sealed portion of the bag body and this non-joint portion is used as a flow path communicating with the outside of the bag body.
  • the non-joint portion has a linear (that is, elongated rectangular) planar shape having a width of 0.1 to 5 mm and a length of 1 to 20 mm.
  • the inside of the bag body is maintained in a state of low oxygen concentration and high carbon dioxide concentration by the flow path, and the freshness of fruits and vegetables inside is maintained.
  • the freshness of the contents can be maintained for a certain period of time, but since the length of the flow path is relatively short, the inflow of oxygen from the outside is relatively large, and the freshness of fruits and vegetables is maintained for a long period of time. It was difficult.
  • Patent Document 2 a packaged product in which a vent having a width of 3 mm or more extending diagonally is provided in the center seal portion has been proposed. According to this configuration, the length of the ventilation path can be increased.
  • Cited Document 2 since the width of the passage port (flow path) is relatively wide, 3 mm or more, dew condensation is likely to occur in the ventilation port (ventilation path). As a result, there is a problem that the internal space of the vent is blocked by the moisture generated by the dew condensation, the flow of air in the vent is obstructed, and the freshness is not sufficiently maintained.
  • Patent Document 1 since the air passage is formed by the heat seal, there is a problem that it is difficult to accurately control the width and shape of the formed air passage.
  • the present invention has been made in view of such a point, and provides a method for producing a freshness-maintaining bag, which has a very small inflow of oxygen from the outside of the bag and can maintain the freshness of the contents for a long period of time.
  • the purpose is to do.
  • Another object of the present invention is to provide a method for producing a bag for maintaining freshness in which a decrease in strength of a portion where a ventilation path is formed is suppressed.
  • a freshness-preserving bag formed of a film, which has a strip-shaped bonding region having a width of 5 mm or more and 15 mm or less in which two ends of the film are overlapped and bonded, and the bonding region is the film. It has a plurality of joints in which the two ends of the film are bonded to each other, and a non-bonded portion in which the ends of the overlapped films arranged between the adjacent joints are not bonded to each other.
  • the non-joint portion constitutes a non-linear ventilation path that communicates the internal space of the bag body with the outside of the bag body, and the ventilation path has a width W of 0.2 mm ⁇ W ⁇ 3 mm and a length.
  • a method for manufacturing a bag for maintaining freshness wherein L is 10 mm ⁇ L ⁇ 50 mm.
  • the step of forming the joint by ultrasonic welding is provided.
  • the step of forming the joint portion is to apply a disk-shaped ultrasonic welding anvil having a plurality of protrusions corresponding to the shape of the joint portion of the bag body continuously formed at predetermined intervals on the outer peripheral portion of the film. This is a step of continuously forming a joint portion on the film while rotating the film.
  • a method for producing a freshness-preserving bag is provided.
  • the film has an oxygen barrier layer.
  • the film has a thickness of 20 ⁇ m or more and 200 ⁇ m or less.
  • the film is one selected from polyethylene, polypropylene, vinyl chloride, styrene acrylonitrile copolymers and laminated films thereof.
  • a method for manufacturing a bag for maintaining freshness in which the inflow of oxygen from the outside of the bag is very small and the freshness of the contents can be maintained for a long period of time.
  • a method for manufacturing a bag for maintaining freshness in which a decrease in strength of a portion where a ventilation path is formed is suppressed.
  • FIG. 1 It is a schematic plan view of the modified example of a bag body. It is a drawing which shows typically the structure of the welding apparatus used in the manufacture of a bag body. It is a schematic perspective view which shows the appearance of the anvil of the welding apparatus of FIG. It is a drawing which shows typically explaining the bag body manufacturing method of the preferable embodiment of this invention. It is a drawing which shows typically explaining the bag body manufacturing method of the preferable embodiment of this invention. It is a drawing which shows typically the tubular body for manufacturing a bag body.
  • FIG. 1 is a schematic plan view of a bag body 100 manufactured by the manufacturing method of the preferred embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1
  • FIG. 3 is a cross-sectional view taken along the line III-III of FIG.
  • the ratio of the dimensions of each element is not accurately represented in the drawings for clarity.
  • the bag body 100 is, for example, a bag body having a rectangular planar shape for storing foods such as coffee.
  • the size of the bag body 100 of the present embodiment is 20 cm ⁇ 40 cm, but the present invention is not limited to this size.
  • the bag body 100 is made of a film 1.
  • the film used in the bag body 100 is preferably an amorphous polymer film. Specific examples include films such as polystyrene, acrylic resin, vinyl chloride, polycarbonate, and styrene acrylonitrile copolymer.
  • the film 1 may be a laminated film in which a plurality of films made of different materials are laminated.
  • the laminated film include a laminated film in which a polystyrene film is laminated inside a polyester, polyethylene, or polypropylene film.
  • a film obtained by laminating an oxygen barrier film and another film can also be used.
  • the oxygen barrier film known films such as a film made of a polymer containing vinyl alcohol or vinylidene chloride as a constituent component, a polymer film on which any of silica, alumina, and aluminum are vapor-deposited, and a metal foil layer can be used.
  • a laminated film in which polystyrene is laminated inside the oxygen barrier film can be used.
  • the film 1 may be transparent or opaque. When the contents are deteriorated by sunlight, it is preferable to use an opaque packaging film. Further, a film having a printed surface may be used in order to enhance the design.
  • the thickness of the film 1 is preferably 10 ⁇ m or more and 300 ⁇ m or less, more preferably 15 ⁇ m or more and 200 ⁇ m or less, and further preferably 20 ⁇ m or more and 100 ⁇ m or less. This is because if the thickness of the film is less than 10 ⁇ m, the strength of the bag body may be insufficient, and if it exceeds 300 ⁇ m, it may be disadvantageous in terms of cost.
  • the bag body 100 has a shape in which a horizontally long rectangular film 1 is folded in half along a center line extending in the vertical direction.
  • the upper and lower ends of the bag body 100 are completely sealed by the top seal 2 and the bottom seal 4 formed by the heat seal.
  • These seals 2 and 4 may be formed by other methods such as adhesion with an adhesive and sealing with tape. It is also possible to form the top seal portion by using a fastener that can be opened and closed. Further, the top seal may be formed after the bag body 100 is filled with the contents without providing the top seal at the beginning.
  • one side end (left end in FIG. 1) of the bag body 100 on which both side end portions 1a and 1b of the film 1 are overlapped has a strip shape extending over the entire length of the overlapped portion of the side end portions 1a and 1b of the film 1. It is joined and closed by the joining region 6.
  • the joint region 6 serves as a side seal portion.
  • the band-shaped joint region 6 is set to have a width of 5 mm or more and 15 mm or less.
  • the width of the strip-shaped joint region 6 is more preferably 6 mm or more and 13 mm or less, and further preferably 8 mm or more and 11 mm or less.
  • the width of the joint region 6 is less than 5 mm, problems such as insufficient strength of the joint and difficulty in securing the length of the ventilation path may occur. Further, if the width of the joining region 6 exceeds 15 mm, problems such as non-uniform joining and difficulty in keeping the width of the ventilation path constant may occur.
  • the band-shaped bonding region 6 includes a thin ultrasonic bonding portion 8 which is a substantially S-shaped ultrasonic bonding portion (ultrasonic bonding portion) having a wall thickness different in length (thickness) in the axial direction, and a thick super
  • the ultrasonic bonding portions 8' are arranged alternately in the longitudinal direction.
  • Each ultrasonic fusion portion (joint portion) 8, 8' is a portion in which both side end portions 1a and 1b of the film 1 are joined and integrated by ultrasonic fusion, and both sides of the film 1 are integrated as described later.
  • the ends 1a and 1b are overlapped with each other and fused by an ultrasonic fusion device (FIGS. 1 and 2).
  • each ultrasonic fusion section 8 has a substantially S-shaped wall thickness, as shown in FIG. 1, the non-adjacent ultrasonic fusion section 8 is not connected.
  • the joint portion 10 also has a substantially S-shape. Further, in the bag body, each non-joining portion 10 has the same dimensions and shape.
  • substantially S-shaped ultrasonic fusion portions (ultrasonic bonding portions) 8 and 8'with different widths are arranged alternately in the longitudinal direction, so that the adjacent non-bonded portions 10
  • the intervals of 10 are different every other interval.
  • pairs of non-joining portions composed of two non-joining portions 10 and 10 arranged in close proximity to each other are arranged in the joining region 6 at predetermined intervals.
  • the inner end of the non-joint portion 10 is open to the inner space of the bag body 100, and the outer end of the non-joint portion 10 is open to the outer space of the bag body 100.
  • the ventilation passage 10 formed by the non-joint portion 10 becomes an S-shaped (that is, non-linear) ventilation passage having a constant width that communicates the internal space of the bag body 100 with the outside (FIG. 1 and FIG. Figure 3).
  • a plurality of S-shaped air passages 10 oriented in the same direction are regularly formed in the side seal portion.
  • the width W of the non-joint portion (ventilation path) 10 is set to 0.2 mm or more and 3 mm or less.
  • the width W of the ventilation passage 10 is more preferably 0.3 mm or more and 2.5 mm or less, and more preferably 0.5 mm or more and 2.0 mm or less.
  • both the release of carbon dioxide and water vapor generated inside the bag body 100 and the prevention of oxygen intrusion from the outside of the bag body 100 are achieved. Becomes possible. Further, when the bag body 100 is moved, it becomes difficult for gas to flow inside the ventilation passage 10, and it becomes difficult for oxygen to enter from the outside.
  • the length L of the ventilation path 10 is set to 20 mm or more and 50 mm or less.
  • the length L of the ventilation passage 10 refers to the length along the central axis of the ventilation passage 10 from the inner end to the outer end of the ventilation passage 10.
  • the length L of the ventilation path 10 is more preferably 22 mm or more and 45 mm or less, and further preferably 25 mm or more and 40 mm or less.
  • the length L of the ventilation path 10 In the bag body 100, by setting the length L of the ventilation path 10 to 20 mm or more and 50 mm or less, the release of carbon dioxide and water vapor generated inside the bag body 100 and the invasion of oxygen from the outside of the bag body 100 are prevented. Are compatible.
  • the ratio L / W of the length L and the width W of the ventilation path 10 is set to 10 or more and 200 or less.
  • the ratio L / W of the length L to the width W is less than 10
  • the storage stability of the contents is remarkably deteriorated, and when this ratio exceeds 200, water is condensed inside the ventilation path and carbon oxide This is because the discharge may be insufficient.
  • the ratio L / W of the length L and the width W of the ventilation passage 10 is more preferably 15 or more and 150 or less, and further preferably 20 or more and 100 or less.
  • the distance between the ventilation passages 10 is set to 1 mm or more and 100 mm or less.
  • the distance between the ventilation passages 10 is set to 1 mm, the accurate shape of the ventilation passages 10 can be ensured.
  • the thickness is set to 30 mm or less, a required number of ventilation passages 10 can be provided.
  • the distance between the ventilation passages 10 is more preferably 2 mm or more and 50 mm or less, and further preferably 3 mm or more and 15 mm or less.
  • the number of ventilation passages 10 formed in the bag body 100 is set to one or more, but 3 or more and 100 or less is preferable, and 5 or more and 75 or less is more preferable.
  • the number of ventilation passages 10 can be increased by setting the number of ventilation passages to 3 or more and 100 or less, more preferably 5 or more and 75 or less. It is preferable because it can prevent the carbon dioxide from being blocked by water and the emission of carbon dioxide becomes insufficient.
  • FIG. 4 to 15 are schematic drawings showing a modified example of the shape of the non-linear air passage 10.
  • the air passage is composed of a plurality of bent straight portions, such as an inverted "he” -shaped air passage 104 as shown in FIG. 4 and a "W" -shaped air passage 105 as shown in FIG. It may be a vent.
  • the ventilation path may be an inclined "W" -shaped ventilation path 106 as shown in FIG.
  • the ventilation path may be a ventilation path 107, 108, 109, 110 having a shape in which a plurality of curved portions as shown in FIGS. 7 to 10 are connected by a straight portion.
  • the ventilation path of the present invention may be a lightning bolt type ventilation path 111 as shown in FIG.
  • the ventilation passage is not limited to the above specific example, and includes other polygonal lines, curved shapes, and those having a shape in which these are combined.
  • ventilation channels 112, 113, 114 in which a non-linear ventilation path and a straight ventilation path are combined may be used.
  • the linear vents included in the vents 112, 113, 114 may be provided in a direction perpendicular to the joint region 6 or may be inclined.
  • the length L of the linear ventilation passages included in the ventilation passages 112, 113, 114 is preferably 10 mm or more and 20 mm or less, more preferably 10 mm or more and 15 mm or less, and the width W is 0.3 mm or more and 1.5 mm or less, more preferably.
  • a band-shaped bonding region 6 having an ultrasonic fusion portion (ultrasonic bonding portion) 8 is provided in the side seal portion, but the ultrasonic fusion portion (ultrasonic bonding portion).
  • the band-shaped bonding region 6 having 8 may be formed in a sealing portion other than the side sealing portion, for example, a top seal 2 and a bottom seal 4.
  • the center seal portion 20 is not connected to the above-mentioned ultrasonic fusion portion (ultrasonic bonding portion) 8. It may be a band-shaped bonding region having a bonding portion (ventilation path).
  • the bag body 100 is configured by overlapping both ends of one film, it may be configured by using a plurality of films.
  • the production of the bag body 100 by the production method of the preferred embodiment of the present invention will be described.
  • the bag body and the like are formed by partially joining the two side end portions 1a and 1b of the rectangular film 1 by an ultrasonic welding method or the like.
  • a horizontally long rectangular film 1 constituting the bag body 100 is prepared.
  • the film 1 is folded in half along the center line extending in the vertical direction, and the end portions 1a and 1b on both sides are overlapped.
  • the side end portions 1a and 1b of the laminated films 1 are heated to a predetermined temperature (30 to 75 degrees Celsius).
  • the heating is preferably performed by a method such as a heating roll or infrared heating.
  • static elimination is performed using an ion wind, a static elimination brush, or the like. It is preferable that static elimination is performed so that the surface potential of the film after static elimination is 1 kv or less.
  • the surface potential can be measured with, for example, a surface electrometer MODEL341B manufactured by Trek Japan Co., Ltd. By removing static electricity, adhesion of dust due to such charging is suppressed.
  • the surface potential of the film after static elimination is preferably an absolute value of 1 kV or less from the viewpoint of preventing dust from adhering.
  • the surface potential can be measured with, for example, a surface electrometer MODEL341B manufactured by Trek Japan Co., Ltd.
  • the upper and lower ends 1a and 1b of the overlapped films are joined by heat seal or the like, and the both side ends 1a and 1b of the overlapped films are temporarily fastened so that their relative positions do not shift. By this temporary fastening, the relative positional deviation of the side end portions 1a and 1b of the overlapped films is prevented.
  • a joint is provided on both side end portions 1a and 1b of the film 1 by forming a plurality of linear ultrasonic fusion portions 8 and 8'at predetermined intervals by an ultrasonic welding method.
  • FIG. 16 is a drawing schematically showing the configuration of a welding device 300 used in the ultrasonic welding method of the manufacturing method of the present embodiment.
  • the welding device 300 includes an ultrasonic oscillator 302 that converts commercial electricity of 50 Hz or 60 Hz into a high frequency signal of about 15 to 70 KHz, and a converter 304 that converts this signal into mechanical vibration.
  • It is a rotary type welding device including a plate-shaped anvil 310. It is preferable that the anvil 310 is capable of controlling the temperature.
  • the horn 308 has a disk shape with a flat outer peripheral surface. Further, on the outer peripheral surface 310a of the anvil 310, a plurality of protrusions 311 and 311'corresponding to the shapes of the ultrasonic fusion portions 8 and 8'of the bag body 100 are continuously formed at predetermined intervals.
  • FIG. 17 is a perspective view of the anvil 310.
  • the disk-shaped anvil 310 has an S-shaped convex portion 311 having a wall thickness corresponding to the joint portions 8 and 8'of the bag body 100 on the outer peripheral surface. 311'is formed, and a recess (notch) notch 312 having a shape corresponding to the non-joint portion 10 of the bag body 100 is provided between the adjacent convex portions 311 and 311'. That is, between the adjacent convex portions 311 and 311', there is a concave (notch) notch 312 having a shape corresponding to the non-joint portion 10 of the bag body 100. Due to the convex portions 311 and 311'and the notch 312, protrusions 311 and 311' corresponding to the shape of the joint portion 10 are formed on the outer peripheral portion 310a of the anvil 310.
  • linear ultrasonic welding portions 8 are continuously formed on the side end portions 1a and 1b of the film.
  • the disc-shaped horn 308 and the anvil 310 are rotated with the side end portions 1a and 1b of the laminated film sandwiched between the horn 308 and the anvil 310 to form a long film.
  • the side end portions 1a and 1b are continuously provided with a joint region 6 having a plurality of ultrasonic fusion portions (joint portions) 8 and 8'and non-joint portions (ventilation paths) 10. It will be formed into.
  • the top seal 2 and the bottom seal 4 are formed to form a bag body 100 (FIG. 19).
  • the top seal 2 is generally formed after the contents are contained in the bag body 100.
  • FIG. 20 is a schematic front view of the bag body 400 of the present embodiment.
  • a long film 401 is bent in the width direction along the longitudinal center line thereof, and both side ends thereof are overlapped.
  • the overlapped both side ends are joined by a joining region 406 similar to that of the bag body 100 of the first embodiment.
  • a joint portion 408 similar to the bag body 100 of the first embodiment and a non-linear air passage 410 are alternately formed.
  • the elongated bag body 400 is cut in the lateral direction, and the upper and lower ends are sealed by the bottom seal portion and the top seal portion, and used in the same form as the bag body 100. ..
  • Example 1 As the film, a film of a styrene acrylonitrile copolymer having a length of 40 cm, a width of 40 cm, and a thickness of 20 ⁇ m was used. Both sides of this film were statically eliminated using a fan-type static eliminator KD-410 manufactured by Kasuga Electric Co., Ltd. The surface potential of the film after static elimination was set to -1 to + 1 kV.
  • a joint region having a width of 10 mm was formed using an ultrasonic fusion device equipped with a disk-shaped horn.
  • the oscillation frequency of the horn was 20 KHz
  • the vibration amplitude was 15 ⁇ m
  • the pressing pressure was 250 N
  • the joining time was 0.2 seconds.
  • the shape of the ventilation passage is the shape shown in FIG. 7, the distance between the ventilation passages is 10 mm, the width of the ventilation passage is 0.8 mm, the width L of the ventilation passage is 24 mm, and the L / W is 30. The distance between the ventilation passages was 12 mm. Next, a bottom seal portion was formed by heat sealing.
  • Example 2 The material of the film was changed to stretched polypropylene / unstretched polypropylene (20 ⁇ m / 30 ⁇ m) laminated film, the shape of the air passage was changed to the “W” shape in Fig. 5, the width of the air passage was 1.2 mm, and the width L of the air passage was 30 mm. , L / W25, and the same conditions as in Example 1 except that the distance between the air passages was 6 mm.
  • Example 3 As a film, an aluminum-deposited polyethylene terephthalate / unstretched polypropylene (16 ⁇ m / 30 ⁇ m, laminated so that the aluminum-deposited surface and the unstretched polypropylene were in contact with each other) were used, and the unstretched polypropylene surfaces were ultrasonically welded to each other.
  • the ventilation path was the ventilation path shown in FIG. 9, and the width and length of the ventilation path were 1.5 mm and 40 mm, respectively, and L / W 26.7.
  • the distance between the ventilation passages was set to 25 mm.
  • Example 3 was carried out in the same manner as in Example 2 except for this.
  • the ventilation path of the obtained freshness-maintaining bag was visually observed, there was no foreign matter in the ventilation path portion, and the width of the ventilation path was constant. In addition, there was no deviation of the film at the striped joint, and the appearance was good.
  • a commercially available leek was placed in this bag and stored at 15 ° C. for 14 days, the leek of the contents did not change in appearance and was in an edible state.
  • Example 4 The width and length of the air passage were 1.0 mm and 80 mm, respectively, and the L / W value was 80.0. In addition, the same conditions as in Example 3 were used in Example 4 except that the distance between the ventilation passages was 80 mm. When the ventilation path of the obtained freshness-maintaining bag was visually observed, there was no foreign matter in the ventilation path portion, and the width of the ventilation path was constant. In addition, there was no deviation of the film at the striped joint, and the appearance was good. When a commercially available leek was placed in this bag and stored at 15 ° C. for 14 days, the leek of the contents did not change in appearance and was in an edible state.
  • Example 5 Instead of forming the top seal part with a heat seal, a fastener was attached to this part so that it could be opened and closed. Other than that, it was set as Example 5 under the same conditions as in Example 1. When the ventilation path of the obtained freshness-maintaining bag was visually observed, there was no foreign matter in the ventilation path portion, and the width of the ventilation path was constant. In addition, there was no deviation of the film at the striped joint, and the appearance was good. When a commercially available leek was placed in this bag and stored at 15 ° C. for 14 days, the leek of the contents did not change in appearance and was in an edible state.
  • Example 6 Using the same film as in Example 2, a tubular body for a bag body was manufactured by the following method. First, both sides of a film having a length of 200 cm and a width of 40 cm were statically removed using a fan-type static eliminator KD-410 manufactured by Kasuga Electric Co., Ltd. The surface potential of the film after static elimination was set to -1 to + 1 kV. Next, both ends were ultrasonically welded in the same manner as in Example 2 to obtain a cylindrical bag body cylinder.
  • This bag body cylinder was cut to a length of 500 mm, and the upper end and the lower end were heat-sealed to obtain four freshness-maintaining bags.
  • Example 7 As the film, a polypropylene film having a length of 75 cm, a width of 28 cm, and a thickness of 30 ⁇ m was used. This film was folded in two in the vertical direction, and the overlapping portions of the edges of the film were ultrasonically welded to form a strip-shaped joint of the present application having a length of 75 cm. The width of the joint is 10 mm, and the ventilation path shown in FIG. 22 is formed therein.
  • the ventilation passage is a set of three S-shaped ventilation passages and two straight ventilation passages, and this is repeated at a cycle of 3.3 cm.
  • the device shown in FIG. 11 was used for ultrasonic welding.
  • the horn had a disk shape and a smooth outer circumference
  • the anvil used was the one shown in FIG. This anvil has a disc-shaped protrusion on the outer periphery having a shape corresponding to the ventilation path.
  • the oscillation frequency of the horn was 20 KHz, the vibration amplitude was 15 ⁇ m, the pressing pressure was 250 N, and the bonding speed was 120 cm / min.
  • Example 8 As the film, a polyethylene film having a length of 75 cm, a width of 28 cm, and a thickness of 30 ⁇ m is used, and Example 8 is carried out in the same manner as in Example 7 except that the shape of the air passage is changed as follows. carried out.
  • Example 8 as shown in FIG. 1, two S-shaped ventilation passages form a set, and this set is repeated at a cycle of 3.0 cm.
  • the bottom seal part was formed by heat sealing. 500 g of long potatoes were put into this bag body, and a top seal portion was formed by heat sealing. When this bag was stored at 15 ° C. for 14 days, the contents of the long potatoes did not change in appearance and were in an edible state.
  • Example 9 was set under the same conditions as in Example 7 except that a polypropylene film having a length of 30 cm, a width of 28 cm, and a thickness of 30 ⁇ m was used as the film.
  • a bottom seal portion was formed by heat sealing. Twelve asparagus with a length of 20 cm were put into this bag, and a top seal portion was formed by heat sealing. When this bag was stored at 15 ° C. for 14 days, the asparagus content did not change in appearance and was in an edible state.
  • the oscillation frequency of the horn was 20 KHz, the vibration amplitude was 15 ⁇ m, the pressing pressure was 300 N, and the bonding speed was 60 cm / min.
  • a bottom seal portion was formed by heat sealing. 8 kg of dried cow dung was put into this bag body, and a top seal portion was formed by heat sealing.
  • Bag body 1 Film 2: Top seal 4: Bottom seal 6: Joint region 8, 8': Ultrasonic fusion part (joint part) 10: Non-joint (ventilation path) 310: Anvil 311 and 311': Convex 312: Concave

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Abstract

袋体外からの酸素の流入が非常に少なく、内容物の鮮度を長期間保つことが可能な鮮度保持用袋体の製造方法を提供すること。　本発明によれば、フィルムによって形成された鮮度保持用袋体であって、フィルムの２つの端部が重ね合わされて接合されている帯状の接合領域を有し、接合領域が、フィルムの２つの端部同士が接合されている複数の接合部と、隣接する接合部の間に配置され重ね合わされたフィルムの端部同士が接合されていない非接合部とを有し、非接合部が、袋体の内部空間と該袋体の外部とを連通する非直線状の通気路を構成している鮮度保持用袋体の製造方法であって、超音波溶着によって接合部を形成するステップを備え、接合部を形成するステップが、外周部に袋体の接合部の形状に対応した複数の突起が所定間隔で連続的に形成されている円板状の超音波溶着アンビルを、フィルムに対して回転させながら、フィルムに連続的に接合部を形成するステップである鮮度保持袋の製造方法が提供される。

Description

鮮度保持用袋体の製造方法
　本発明は鮮度保持用袋体の製造方法に関し、詳細には、呼吸や発酵により保存中に二酸化炭素を発生する食品や生花の鮮度低下を抑制することができる鮮度保持用袋体の製造方法に関する。
　野菜、果物、生花、コーヒー豆、加工食品などのように、呼吸や発酵によって二酸化炭素を発生する食物等を、鮮度を維持した状態で保存することができる袋体、あるいは生花を長期間保存できる袋体へのニーズが高まっている。
　上記食品等を長期間保存する袋体には、内部で発生した二酸化炭素や水蒸気の排出と、外部からの酸素の流入の防止という、相反する二つ機能が要求される。二酸化炭素や水蒸気の排出が不充分だと内圧が上昇して、袋体が破損する場合があり、また、酸素の流入を防止しないと酸化によって内容物の鮮度が低下するためである。
　このようなニーズに対し、袋体の熱シール部に、ストライプ状に配置された非接合部を設け、この非接合部を袋体の外部と連通する流路として利用する青果物包装品(袋体)が提案されている（特許文献１）。この袋体では、非接合部(流路)が、幅０．１～５ｍｍ、長さ１～２０ｍｍの直線状（即ち細長い長方形）の平面形状を有している。
　この袋体では、流路によって、袋体の内部が、酸素濃度が低く且つ二酸化炭素濃度が高い状態に維持され、内部の青果物の鮮度が保持される。この袋体では、ある程度の期間、内容物の鮮度を保持できるが、流路の長さが比較的、短いため、外部からの酸素の流入が比較的多く、長期間にわたって青果物の鮮度を保持することが難しかった。
　この問題点に対処すべく、斜めに延びる幅３ｍｍ以上の通気口がセンターシール部に設けられた包装品が提案されている（特許文献２）。この構成によれば、通気路の長さを長くすることができる。
特許第３２５９１６６号公報 特許第６０５２７２９号公報
　しかしながら、引用文献２の構成では、通路口（流路）の幅が、３ｍｍ以上と比較的に広いため、通気口（通気路）内で結露が生じ易かった。この結果、結露で生じた水分で通気口の内部空間が塞がれ、通気口中の空気の流れが阻害されて、鮮度保持が十分に行なわれないという問題があった。
　また、特許文献１および特許文献２のいずれの構成においても、通気路はシール部で直線状に延びる構成であるため、通気路が延びる方向におけるシール部の強度が低下してしまう、という問題があった。
　さらに、特許文献１および特許文献２のいずれの構成においても、通気路が熱シールによって形成されているため、形成する通気路の幅および形状を正確に制御することが難しいという問題もあった。
　本発明はこのような点に鑑みてなされたものであり、袋体外からの酸素の流入が非常に少なく、内容物の鮮度を長期間保つことが可能な鮮度保持用袋体の製造方法を提供することを目的とする。
　本発明の他の目的は、通気路が形成された部分の強度低下が抑制された鮮度保持用袋体の製造方法を提供することである。
　本発明によれば、
　フィルムによって形成された鮮度保持用袋体であって、前記フィルムの２つの端部が重ね合わされて接合されている幅５ｍｍ以上１５ｍｍ以下の帯状の接合領域を有し、前記接合領域が、前記フィルムの２つの端部同士が接合されている複数の接合部と、隣接する前記接合部の間に配置され前記重ね合わされたフィルムの端部同士が接合されていない非接合部とを有し、前記非接合部が、前記袋体の内部空間と該袋体の外部とを連通する非直線状の通気路を構成し、該通気路は幅Ｗが、０．２ｍｍ≦Ｗ≦３ｍｍであり、長さＬが、１０ｍｍ≦Ｌ≦５０ｍｍである鮮度保持用袋体の製造方法であって、
　超音波溶着によって前記接合部を形成するステップを備え、
　前記接合部を形成するステップが、外周部に前記袋体の接合部の形状に対応した複数の突起が所定間隔で連続的に形成されている円板状の超音波溶着アンビルを、前記フィルムに対して回転させながら、前記フィルムに連続的に接合部を形成するステップである、
　ことを特徴とする鮮度保持袋の製造方法が提供される。
　このような構成によれば、接合部が超音波溶接によって形成されるので、隣接する溶接部間に位置する非接合部によって構成される通気路の幅および形状を正確に制御することが可能となる。この結果、収容する内容物に適した換気が可能となる寸法形状の通気路を形成することができる。
　本発明の他の好ましい態様によれば、
　前記フィルムが、酸素バリア層を有している。
　本発明の他の好ましい態様によれば、
　前記フィルムは、厚さが２０μm以上２００μm以下である。
　本発明の他の好ましい態様によれば、
　前記フィルムは、ポリエチレン、ポリプロピレン、塩化ビニル、スチレンアクリロニトリル共重合体およびこれらの積層フィルムから選ばれる一種である。
　本発明によれば、袋体外からの酸素の流入が非常に少なく、内容物の鮮度を長期間保つことが可能な鮮度保持用袋体の製造方法が提供される。
　さらに、本発明によれば、通気路が形成された部分の強度低下が抑制された鮮度保持用袋体の製造方法等が提供される。
本発明の好ましい実施形態の製造方法で製造された袋体１００の模式的な平面図である。 図１のII-II線に沿った模式的な断面図である。 図１のIII-III線に沿った模式的な断面図である。 非接合部で構成される通気路の変形例を示す模式的な図面である。 非接合部で構成される通気路の変形例を示す模式的な図面である。 非接合部で構成される通気路の変形例を示す模式的な図面である。 非接合部で構成される通気路の変形例を示す模式的な図面である。 非接合部で構成される通気路の変形例を示す模式的な図面である。 非接合部で構成される通気路の変形例を示す模式的な図面である。 非接合部で構成される通気路の変形例を示す模式的な図面である。 非接合部で構成される通気路の変形例を示す模式的な図面である。 非接合部で構成される通気路の変形例を示す模式的な図面である。 非接合部で構成される通気路の変形例を示す模式的な図面である。 非接合部で構成される通気路の変形例を示す模式的な図面である。 袋体の変形例の模式的な平面図である。 袋体の製造で使用する溶着装置の構成を模式的に示す図面である。 図１６の溶着装置のアンビルの外観を示す模式的な斜視図である。 本発明の好ましい実施形態の袋体製造方法を説明する模式的に示す図面である。 本発明の好ましい実施形態の袋体製造方法を説明する模式的に示す図面である。 袋体を製造するための筒状体を模式的に示す図面である。
　以下、本発明の好ましい実施形態の製造方法で製造される袋体１００の構成を図面に沿って詳細に説明する。図１は、本発明の好ましい実施形態の製造方法で製造される袋体１００の模式的な平面図である。図２は、図１のII-II線に沿った断面図であり、図３は、図１のIII-III線に沿った断面図である。本願では、図面中、明確化のため、各要素の寸法の比率は正確に表わされていない。
　袋体１００は、例えば、コーヒー等の食品を保存する長方形の平面形状を有している袋体である。本実施形態の袋体１００の寸法は、２０ｃｍ×４０ｃｍであるが、本発明は、この寸法に限定されるものではない。
　袋体１００は、フィルム１で構成されている。袋体１００で使用されるフィルムは、非晶質のポリマーのフィルムが好ましい。具体的な例として、ポリスチレン、アクリル樹脂、塩化ビニル、ポリカーボネート、スチレンアクリロニトリル共重合体などのフィルムが挙げられる。
　フィルム１は、異なる素材からなる複数枚のフィルムが積層された積層フィルムでもよい。積層フィルムとしてはポリエステル、ポリエチレンまたはポリプロピレンのフィルムの内側にポリスチレンのフィルムを積層した積層フィルム等が挙げられる。
　フィルム１として、酸素バリアフィルムと他のフィルムを積層したものも用いることができる。酸素バリアフィルムとしては、ビニルアルコールまたは塩化ビニリデンを構成成分として含むポリマーからなるフィルム、シリカ、アルミナ、アルミニウムのいずれかを蒸着したポリマーフィルム、金属箔層などの公知のものを用いることができる。この酸素バリアフィルムの内側にポリスチレンを積層した積層フィルムを用いることができる。
　フィルム１は、透明であっても不透明であってもよい。内容物が日光によって劣化する場合は不透明な包装フィルムを用いることが好ましい。また、意匠性を高めるために表面に印刷を施したフィルムでもよい。
　フィルム１の厚みは、１０μｍ以上３００μｍ以下、より好ましくは１５μｍ以上２００μｍ以下、更に好ましくは２０μｍ以上１００μｍ以下であることが好ましい。フィルムの厚みが１０μｍ未満の場合、袋体の強度が不充分になる場合があり、３００μｍを超えるとコスト上、不利になる場合があるためである。
　袋体１００は、横長の長方形のフィルム１を、上下方向に延びる中心線に沿って二つ折りにした形状を有している。袋体１００の上下端は、ヒートシールによって形成されたトップシール２、ボトムシール４によって完全に封止されている。これらのシール２、４は、接着剤による接着、テープによる封止等の他の方法によって形成されたものでもよい。
　また、開閉可能なファスナーを用いてトップシール部を形成することもできる。さらに、当初はトップシールを設けず、袋体１００に内容物を充填した後、トップシールを形成してもよい。
　また、フィルム１の両側端部１ａ、１ｂが重ね合わされている袋体１００の一側端(図１の左端)は、フィルム１の側端部１ａ、１ｂの重ね合わせ部分の全長にわたって延びる帯状の接合領域６によって、接合され閉鎖されている。袋体１００では、接合領域６がサイドシール部となる。
　袋体１００では、帯状の接合領域６は、幅が５ｍｍ以上１５ｍｍ以下に設定されている。帯状の接合領域６の幅は、６ｍｍ以上１３ｍｍ以下がより好ましく、８ｍｍ以上１１ｍｍ以下がさらに好ましい。
　接合領域６の幅が５ｍｍ未満になると、接合部の強度が不充分になる、通気路の長さを確保しにくくなる等の問題が生じる場合がある。また、接合領域６の幅が１５ｍｍを超えると接合が不均一になる、通気路の幅を一定にし難くなる等の問題が生ずる場合がある。
　帯状の接合領域６には、軸線方向の長さ(厚さ)が異なる肉厚の略Ｓ字状の超音波融着部（超音波接合部）である薄い超音波接合部８と、厚い超音波接合部８’が、長手方向に交互に配列されている。各超音波融着部（接合部）８、８’は、フィルム１の両側端部１ａ、１ｂが、超音波融着により接合され一体化された部分であり、後述のようにフィルム１の両側端部１ａ、１ｂ同士を重ねて、超音波融着装置でこれらを融着することによって形成されている（図１および図２）。
　隣接する超音波融着部（接合部）８、８’の間は、重ね合わされたフィルム１の側端部１ａ、１ｂ同士が接合（融着）されていない非接合部１０とされている。上述したように、各超音波融着部８は肉厚の略Ｓ字状の形状を有しているので、図１に示されているように、隣接する超音波融着部８間の非接合部１０も略Ｓ字形状を有している。また、袋体では、各非接合部１０は、同一の寸法形状を有している。
　袋体１００では、幅が異なる肉厚の略Ｓ字状の超音波融着部（超音波接合部）８、８’が、長手方向に交互に配列されているので、隣接する非接合部１０、１０の間隔は、一つおきに異なった間隔となっている。換言すれば、袋体１００では、近接して配置された２つの非接合部１０、１０によって構成された非接合部の対が、所定間隔で、接合領域６に配列されている。
　非接合部１０の内方端は、袋体１００の内部空間に開口し、非接合部１０の外方端は、袋体１００の外部空間に開口している。この結果、非接合部１０によって構成される通気路１０は、袋体１００の内部空間と外部とを連通する、一定幅のＳ字状（すなわち非直線状）の通気路となる（図１および図３）。
　この結果、袋体１００では、サイドシール部に、同一方向に配向された複数のＳ字状の通気路１０が、規則的に形成されていることになる。
　袋体１００では、非接合部（通気路）１０の幅Wは、０．２ｍｍ以上、３ｍｍ以下に設定されている。通気路１０の幅Wは、０．３ｍｍ以上２．５ｍｍ以下がさらに好ましく、０．５ｍｍ以上２．０ｍｍ以下がより好ましい。
　通気路１０の幅Wを０．２ｍｍ以上３．０ｍｍ以下にすることで、袋体１００の内部で生成された二酸化炭素や水蒸気の放出と、袋体１００の外部からの酸素の侵入防止を両立が可能になる。さらに袋体１００を動かした際に通気路１０の内部で気体が流動し難く、外部から酸素が侵入し難くなる。
　袋体１００では、通気路１０の長さＬは、２０ｍｍ以上５０ｍｍ以下に設定されている。なお、通気路１０の長さＬとは、通気路１０の内方端から外方端までの通気路１０の中心軸に沿った長さを指す。
　通気路１０の長さＬは、２２ｍｍ以上４５ｍｍ以下がより好ましく、２５ｍｍ以上４０ｍｍ以下がさらに好ましい。
　袋体１００では、通気路１０の長さＬを２０ｍｍ以上５０ｍｍ以下にすることで、袋体１００の内部で発生した二酸化炭素や水蒸気の放出と、袋体１００の外部からの酸素の侵入防止とが両立させている。
　また、袋体１００では、通気路１０の長さＬと幅Ｗの比Ｌ／Ｗは、１０以上２００以下に設定されている。長さＬと幅Ｗの比Ｌ／Ｗが、１０未満になると内容物の保存性が顕著に悪化し、また、この比が２００を超えると通気路の内部に水分が凝縮して酸化炭素の排出が不充分になる場合があるためである。
　通気路１０の長さＬと幅Ｗの比Ｌ／Ｗは、１５以上１５０以下がより好ましく、２０以上１００以下がさらに好ましい。
　更に、袋体１００では、通気路１０の間隔は、１ｍｍ以上１００ｍｍ以下に設定されている。通気路１０の間隔を１ｍｍとすることにより通気路１０の正確な形状を確保できる。また、３０ｍｍ以下とすることにより、必要な数の通気路１０を設けることができる。
　通気路１０の間隔は、２ｍｍ以上５０ｍｍ以下がより好ましく、３ｍｍ以上１５ｍｍ以下が更に好ましい。
　袋体１００では、袋体１００に形成する通気路１０の数は１個以上に設定されているが、３以上１００以下が好ましく、５以上７５以下がさらに好ましい。
　特に、保存中に比較的に多量の二酸化炭素を発生させる青果物などを保存する場合は、通気路の数を３以上１００以下、より好ましくは５以上７５以下に設定することで、通気路１０が水により閉塞されて二酸化炭素の排出が不充分になることを防止でき、好ましい。
　図４乃至図１５は、非直線状の通気路１０の形状の変形例を示す模式的な図面である。
　通気路は、図４に示すような逆「へ」字状の通気路１０４、図５に示すような「Ｗ」字状の通気路１０５のように、複数の屈曲した直線部によって構成された通気路であってもよい。
　また、通気路は、図６に示すような傾斜した「Ｗ」字状の通気路１０６であってもよい。さらに、通気路は、図７乃至１０に示すような複数の湾曲部が直線部によって接続された形状の通気路１０７、１０８、１０９、１１０であってもよい。さらに、本発明の通気路は、図１１に示すような稲妻型の通気路１１１であってもよい。
　さらにまた、通気路には、上記具体例に限定されず、他の折れ線、曲線形、これらを組み合わせた形状を有するものが含まれる。
　たとえば、図１２ないし図１４に示されているように、非直線の通気路と直線の通気路とが組み合わされた通気路１１２、１１３、１１４でもよい。
　通気路１１２、１１３、１１４に含まれる直線状の通気路は、接合領域６に対して直角方向に設けられても、傾斜して設けられてもよい。通気路１１２、１１３、１１４に含まれる直線状の通気路の長さＬは１０ｍｍ以上２０ｍｍ以下、より好ましくは１０ｍｍ以上１５ｍｍ以下が好ましく、幅Ｗは０．３ｍｍ以上１．５ｍｍ以下、より好ましくは０．３ｍｍ以上１．０ｍｍ以下が好ましい。直線状の通気路の長さＬと幅Ｗをこの範囲とすることで、袋体１００の内部で発生した二酸化炭素や水蒸気の放出と、袋体１００の外部からの酸素の侵入防止とを両立させることができる。
　また、上記袋体１００では、超音波融着部（超音波接合部）８を有する帯状の接合領域６が、サイドシール部に設けられていたが、超音波融着部（超音波接合部）８を有する帯状の接合領域６を、サイドシール部以外の他のシール部、例えば、トップシール２、ボトムシール４に形成してもよい。
　例えば、図１５に示されているような、センターシール部２０で封止されている袋体２００において、このセンターシール部２０を、上述した超音波融着部（超音波接合部）８と非接合部（通気路）とを有する帯状の接合領域としてもよい。
　更に、上記袋体１００は、１枚のフィルムの両端部を重ねて構成されていたが、複数のフィルムを用いて構成されたものでもよい。
　次に、本発明の好ましい実施態様の製造方法による袋体１００の製造について説明する。本実施態様の製造方法は、長方形状のフィルム１の２つの側端部１ａ、１ｂを、部分的に超音波溶着法で接合すること等により、上記袋体等を形成するものである。
　本実施態様の製造方法では、まず、袋体１００を構成する横長の矩形形状のフィルム１を準備する。次いで、フィルム１を、上下方向に延びる中心線に沿って二つ折りにして、両側端部１ａ、１ｂを重ね合わせる。
　次いで、少なくとも重ね合わされたフィルム１の両側端部１ａ、１ｂを所定温度（摂氏３０度乃至７５度）まで加熱する。加熱は、加熱ロール、赤外線加熱等の方法によって行なわれるのが好ましい。
　次いで、加熱したフィルムの除電を行なう。加熱されたフィルムは弾性率が低下してしなやかになるため、搬送ロールなどの物体に接触した時に接触面積が増大する等の理由により、帯電しやすい。この帯電を排除するために、超音波溶着の前に除電をすることが好ましい。
　具体的には、イオン風、除電ブラシ等を用いて除電が行なわれる。除電後のフィルムの表面電位が、１ｋｖ以下となるように除電が行なわれるのが好ましい。表面電位の測定は、例えばトレック・ジャパン株式会社製の表面電位計ＭＯＤＥＬ３４１Ｂで測定することができる。除電を行なうことにより、このような帯電に起因する埃の付着が抑制される。
　除電後のフィルムの表面電位はゴミ付き防止の観点から絶対値が１ｋＶ以下であることが好ましい。表面電位の測定は、例えばトレック・ジャパン株式会社製の表面電位計ＭＯＤＥＬ３４１Ｂで測定することができる。
　次いで、重ね合わされているフィルムの両側端部１ａ、１ｂの上下両端をヒートシール等によって接合し、重ね合わされたフィルムの両側端部１ａ、１ｂを相対位置がずれないように仮留めする。この仮留めによって、重ね合わされたフィルムの両側端部１ａ、１ｂの相対位置ずれが防止される。
　次に、超音波溶着法によって、フィルム１の両側端部１ａ、１ｂに、所定間隔で複数の線状の超音波融着部８、８’形成することによって接合部を設ける。
　図１６は、本実施形態の製造方法の超音波溶着法に用いる溶着装置３００の構成を模式的に示す図面である。
　図１６に示されているように、溶着装置３００は、５０Ｈｚまたは６０Ｈｚの商用電気を１５～７０ＫＨｚ程度の高周波信号に変換する超音波発振機３０２と、この信号を機械的振動に変換するコンバータ３０４と、この機械的振動を増幅するブースター３０６と、増幅された振動を溶着対象(フィルム１)に伝える円板状のホーン３０８と、円板状のホーン３０８との間でフィルム１を挟持する円板状のアンビル３１０と、を備えているロータリ式の溶着装置である。アンビル３１０は温度を制御できるものであることが好ましい。
　本実施形態の製造方法で用いられる溶着装置３００ではホーン３０８は、外周面が平坦な円板形状を有している。また、アンビル３１０の外周面３１０ａには、袋体１００の超音波融着部８、８’の形状に対応した複数の突起３１１、３１１’が、所定間隔で連続的に形成されている。
　図１７は、アンビルの３１０の斜視図である。図１７に示されているように、円板状のアンビル３１０は、外周面に、袋体１００の接合部８、８’に、それぞれ対応する形状の肉厚のＳ字状の凸部３１１、３１１’が形成され、隣接する凸部３１１、３１１’の間は、袋体１００の非接合部１０に対応した形状の凹部（切欠き）切り欠き３１２が設けられている。即ち、隣接する凸部３１１、３１１’の間は、袋体１００の非接合部１０に対応した形状の凹部（切欠き）切り欠き３１２とされている。これら凸部３１１、３１１’と切り欠き３１２により、アンビル３１０の外周部３１０ａには接合部１０の形状に対応する突起３１１、３１１’が形成されていることになる。
　このようなアンビルを用いる場合、外周部が平坦なホーンを用いることが、超音波の発信が安定するので好ましい。
　このロータリ式の溶着装置３００を使用した溶着作業では、フィルムの側端部１ａ、１ｂに、連続的に線状の超音波融着部８が形成される。具体的には、ホーン３０８とアンビル３１０の間に、重ね合わされたフィルムの側端部１ａ、１ｂを挟持した状態で、円板状のホーン３０８とアンビル３１０を回転させ、長尺状のフィルムの側端部１ａ、１ｂに、図１８に示されているように、複数の超音波融着部（接合部）８、８’および非接合部（通気路）１０を有する接合領域６を連続的に形成していく。
　さらに、側端部１ａ、１ｂが接合領域６で接合され筒状に形成されたフィルムは、トップシール２とボトムシール４が形成され、袋体１００とされる（図１９）。トップシール２は、袋体１００への内容物収容後に形成されるのが一般的である。
　次に、上記実施形態の袋体１００を製造するために使用される筒体４００について説明する。図２０は、本実施形態の袋体用筒体４００の模式的な正面図である。
　図２０に示されているように、本実施形態の袋体用筒体４００は、長尺状のフィルム４０１を、その長手方向中心線に沿って幅方向に折り曲げて両側端部を重ね合わせ、重ね合わされた両側端部が、第１の実施形態の袋体１００と同様の接合領域４０６によって接合されているものである。
　この接合領域４０６には、第１の実施形態の袋体１００と同様の接合部４０８と非直線状の通気路４１０が、交互に形成されている。
　この細長い袋体用筒体４００を、図２０に点線で示すように、横方向に切断し、上下端を、ボトムシール部とトップシール部によって密封し、袋体１００と同様の形態として使用する。
　本発明の前記実施形態に限定されることなく、特許請求の範囲に記載された技術的思想の範囲内で種々の変更、変形が可能である。
　以下、実施例に沿って、本発明をさらに詳しく説明する。
（実施例１）
　フィルムとして、縦４０ｃｍ、横４０ｃｍ、厚さ２０μｍのスチレンアクリロニトリル共重合体のフィルムを用いた。このフィルムの両面を春日電機(株)製、ファンタイプ静電気除去装置ＫＤ－４１０を用いて除電した。除電後のフィルムの表面電位は－１～＋１ｋＶになるようにした。
　その後、円板状のホーンを備えた超音波融着装置を用いて、幅１０ｍｍの接合領域を形成した。ホーンの発振振動数は２０ＫＨｚ、振動振幅は１５μｍ、押しつけ圧は２５０Ｎ、接合時間は０．２秒とした。
　通気路の形状は図７に示す形状であり、通気路どうしの間隔は１０ｍｍとし、通気路の幅は０．８ｍｍ、通気路の幅Ｌは２４ｍｍ、Ｌ／Ｗは３０とした。また、通気路の間隔は１２ｍｍとした。次いで、ヒートシールによりボトムシール部を形成した。
　このようにして製造した袋体の通気路を目視観察したところ、通気路部分には異物等はなく、通気路の幅も一定であった。
　この袋体に市販のニラ１５０ｇを入れて、ヒートシールによりトップシール部を形成して袋体とした。この袋体を１５℃で１４日間保存したところ、内容物のニラには外見上の変化は無く、可食状態であった。
（実施例２）
　フィルムの材料を延伸ポリプロピレン／未延伸ポリプロピレン(２０μｍ／３０μｍ)積層フィルムに変更し、通気路の形状を図５の「W」型とし、通気路の幅は1.2ｍｍ、通気路の幅Ｌを30ｍｍ、Ｌ／Ｗ２５、通気路どうしの間隔は６ｍｍとした点を除き実施例１と同条件として、実施例２とした。
　この鮮度保持用袋体に市販のニラ１５０ｇを入れて、ヒートシールによりトップシール部を形成し、袋体とした。この袋体を１５℃で１４日間保存したところ、内容物のニラには外見上の変化は無く、可食状態であった。
（実施例３）
　フィルムとしてアルミ蒸着ポリエチレンテレフタレート／未延伸ポリプロピレン(１６μｍ／３０μｍ、アルミ蒸着面と未延伸ポリプロピレンが接するように積層)積層フィルムを用い、未延伸ポリプロピレン面どうしを超音波溶着した。
　通気路は、図９の通気路とし、通気路の幅と長さはそれぞれ１．５ｍｍと４０ｍｍ、Ｌ／W２６．７とした。また、通気路間の間隔は２５ｍｍとした。
　これ以外は実施例２と同様にして実施例３を実施した。得られた鮮度保持用袋体の通気路を目視観察したところ、通気路部分には異物等はなく、通気路の幅も一定であった。また、ストライプ状の接合部にフィルムのズレもなく、外見も良好であった。
　この袋体に市販のニラを入れ、１５℃で１４日間保存したところ、内容物のニラには外見上の変化は無く、可食状態であった。
（実施例４）
　通気路の幅と長さを、それぞれ１．０ｍｍと８０ｍｍ、Ｌ／Wの値は８０．０とした。また、通気路間の間隔は８０ｍｍとした点を除き、実施例３と同条件で、実施例４とした。得られた鮮度保持用袋体の通気路を目視観察したところ、通気路部分には異物等はなく、通気路の幅も一定であった。また、ストライプ状の接合部にフィルムのズレもなく、外見も良好であった。この袋体に市販のニラを入れ、１５℃で１４日間保存したところ、内容物のニラには外見上の変化は無く、可食状態であった。
（実施例５）
　トップシール部をヒートシールで形成する代わりに、この部分にファスナーを取り付けて、開閉可能とした。それ以外は、実施例１と同条件で、実施例５とした。得られた鮮度保持用袋体の通気路を目視観察したところ、通気路部分には異物等はなく、通気路の幅も一定であった。また、ストライプ状の接合部にフィルムのズレもなく、外見も良好であった。この袋体に市販のニラを入れ、１５℃で１４日間保存したところ、内容物のニラには外見上の変化は無く、可食状態であった。
（実施例６）
　実施例２と同じフィルムを用い、以下の方法で袋体用筒体を製造した。
　まず、縦２００ｃｍ、横４０ｃｍのフィルムの両面を春日電機(株)製、ファンタイプ静電気除去装置ＫＤ－４１０を用いて除電した。除電後のフィルムの表面電位は－１～＋１ｋＶになるようにした。次いで、実施例２と同様にして両端部を超音波溶着し、円筒形の袋体用筒体を得た。
　この袋体用筒体を、長さ５００ｍｍで裁断し、上端と下端をヒートシールすることにより、４つの鮮度保持用袋体が得られた。
（実施例７）
　フィルムとして、縦７５ｃｍ、横２８ｃｍ、厚さ３０μｍのポリプロピレンフィルムを用いた。このフィルムを縦方向に２つに折り、フィルムの端部の重なった部分を超音波溶着して長さ７５ｃｍの、本願の帯状接合部を形成した。接合部の幅は１０ｍｍで、そこに図２２に示す通気路が形成されている。通気路はＳ字型の通気路３本と、直線状の通気路２本が１セットになっていて、これが３．３ｃｍ周期で繰り返されている。
　Ｓ字型の通気路は幅Ｗ＝０．８ｍｍ、長さＬ＝３０ｍｍであり、直線状の通気路は幅Ｗ＝０．８ｍｍ、長さＬ＝１０ｍｍである。超音波溶着は図１１の装置を用いた。ホーンは円板状で外周部が平滑なもの、アンビルは図１６に示すものを用いた。このアンビルには円板状で外周部に通気路に対応する形状の突起が形成されている。
　ホーンの発振振動数は２０ＫＨｚ、振動振幅は１５μｍ、押しつけ圧は２５０Ｎ、接合速度は１２０ｃｍ／分とした。
　このようにして製造した袋体の通気路を目視観察したところ、通気路部分には異物等はなく、通気路の幅も一定であった。
　次いで、ヒートシールによりボトムシール部を形成した。この袋体に長芋５００ｇを入れ、ヒートシールによりトップシール部を形成した。
　この袋体を１５℃で１４日間保存したところ、内容物の長芋には外見上の変化は無く、可食状態であった。
（実施例８）
　フィルムとして、縦７５ｃｍ、横２８ｃｍ、厚さ３０μｍのポリエチレンフィルムを用いることと、通気路の形状を以下のように変える以外は実施例８と同様にして実施例７と同様にして実施例８を実施した。
　実施例８では、通気路は、図１に示すようにＳ字型の通気路２本が１セットとなり、このセットが３．０ｃｍ周期で繰り返されている。Ｓ字型の通気路は幅Ｗ＝０．８ｍｍ、長さＬ＝３０ｍｍである。
　ヒートシールによりボトムシール部を形成した。この袋体に長芋５００ｇを入れ、ヒートシールによりトップシール部を形成した。この袋体を、１５℃で１４日間保存したところ、内容物の長芋には外見上の変化は無く、可食状態であった。
（実施例９）
　フィルムとして、縦３０ｃｍ、横２８ｃｍ、厚さ３０μｍのポリプロピレンフィルムを用いる以外は実施例７と同一条件で実施例９とした。
　得られた袋体について、ヒートシールによりボトムシール部を形成した。この袋体に長さ２０ｃｍのアスパラガス１２本を入れ、ヒートシールによりトップシール部を形成した。この袋体を１５℃で１４日間保存したところ、内容物のアスパラガスには外見上の変化は無く、可食状態であった。
（実施例１０）
　フィルムとして、縦６０ｃｍ、横８０ｃｍ、厚さ１５０μｍの塩化ビニルフィルムを用いた。このフィルムを縦方向に２つに折り、フィルムの端部の重なった部分を超音波溶着して長さ６０ｃｍ、幅１５ｍｍの帯状の接合領域を形成した。この接合領域に、図１１に示す態様の通気路を形成した。通気路は稲妻型の通気路１本を１セットとして、これが５．０ｃｍ周期で繰り返されている。通気路は幅Ｗ＝３ｍｍ、長さＬ＝４０ｍｍである。
　ホーンの発振振動数は２０ＫＨｚ、振動振幅は１５μｍ、押しつけ圧は３００Ｎ、接合速度は６０ｃｍ／分とした。
　得られた袋体について、ヒートシールによりボトムシール部を形成した。この袋体に乾燥牛フン８Ｋｇを入れ、ヒートシールによりトップシール部を形成した。
　この袋体を２５℃／７０％ＲＨの雰囲気で３０日間保存したところ、袋体の破損や内容物の外見には変化は無かった。
１００：袋体
１：フィルム
２：トップシール
４：ボトムシール
６：接合領域
８、８’：超音波融着部（接合部）
１０：非接合部（通気路）
３１０：アンビル
３１１、３１１’：凸部
３１２：凹部

Claims (4)

  1. 　フィルムによって形成された鮮度保持用袋体であって、前記フィルムの２つの端部が重ね合わされて接合されている幅５ｍｍ以上１５ｍｍ以下の帯状の接合領域を有し、
    　前記接合領域が、前記フィルムの２つの端部同士が接合されている複数の接合部と、隣接する前記接合部の間に配置され前記重ね合わされたフィルムの端部同士が接合されていない非接合部とを有し、前記非接合部が、前記袋体の内部空間と該袋体の外部とを連通する非直線状の通気路を構成し、該通気路は幅Ｗが、０．２ｍｍ≦Ｗ≦３ｍｍであり、長さＬが、１０ｍｍ≦Ｌ≦５０ｍｍである鮮度保持用袋体の製造方法であって、
    　超音波溶着によって前記接合部を形成するステップを備え、
    　前記接合部を形成するステップが、外周部に前記袋体の接合部の形状に対応した複数の突起が所定間隔で連続的に形成されている円板状の超音波溶着アンビルを、前記フィルムに対して回転させながら、前記フィルムに連続的に接合部を形成するステップである、
    　ことを特徴とする鮮度保持袋の製造方法。
  2. 　前記フィルムが、酸素バリア層を有している、
    　請求項１に記載の鮮度保持用袋体の製造方法。
  3. 　前記フィルムは、厚さが２０μm以上２００μm以下である、
    　請求項１または２に記載の鮮度保持用袋体の製造方法。
  4. 　前記フィルムは、ポリエチレン、ポリプロピレン、塩化ビニル、スチレンアクリロニトリル共重合体およびこれらの積層フィルムから選ばれる一種である、
    　請求項１ないし３のいずれか１項に記載の鮮度保持用袋体の製造方法。
PCT/JP2020/031841 2019-08-23 2020-08-24 鮮度保持用袋体の製造方法 WO2021039717A1 (ja)

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