JP2020006960A - Freshness preserving container, components of freshness preserving container and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a freshness-keeping container capable of keeping the freshness of contents for a long period of time with very little inflow of oxygen from the outside, a member for constituting a freshness-keeping container, and a manufacturing method thereof. According to the present invention, there is provided a freshness container 100 having a ventilation part, wherein the ventilation part is a band-shaped joint having a width of 5 mm or more and 15 mm or less in which two ends of a film 106a106 are overlapped and joined. And a bonding region is constituted by a band-shaped ultrasonic bonding part 108 in which two ends of the film are bonded to each other, and the ends of the film superposed on the ultrasonic bonding part are not bonded to each other. The joint portion is arranged, and the non-joint portion constitutes a non-linear air passage 110 that communicates the internal space of the container with the outside of the container, and the air passage has a width W of 0.2 mm ≦ W ≦ 3 mm. , A length L of 20 mm ≦ L ≦ 50 mm is provided. [Selection diagram] Figure 1

Description

  The present invention relates to a freshness holding container, a member for forming a freshness holding container, a method for manufacturing the same, and the like. More specifically, a freshness holding that can suppress a decrease in freshness of foods and fresh flowers that generate carbon dioxide during storage by respiration or fermentation. The present invention relates to a container, a member for forming a freshness holding container, a method of manufacturing the same, and the like.

  Packaging materials that can store foods that generate carbon dioxide by respiration or fermentation, such as vegetables, fruits, fresh flowers, coffee beans, processed foods, etc. while maintaining freshness, or fresh flowers can be stored for a long time The need for packaging materials is increasing.

  A packaging material for storing the above food or the like for a long period of time is required to have two contradictory functions of discharging carbon dioxide and water vapor generated inside and preventing inflow of oxygen from outside. If the discharge of carbon dioxide or water vapor is insufficient, the internal pressure rises and the packaging material may be damaged, and if the inflow of oxygen is not prevented, the freshness of the contents is reduced by oxidation.

  In response to such needs, a non-bonded portion arranged in a stripe shape is provided in the heat seal portion of the packaged product (bag), and the fruit and vegetable packaging that uses the non-bonded portion as a flow path communicating with the outside of the packaged product. A product has been proposed (Patent Document 1). In this package, the non-joined portion (flow path) has a linear (i.e., elongated rectangular) planar shape having a width of 0.1 to 5 mm and a length of 1 to 20 mm.

  In this package, the flow path maintains the inside of the container at a low oxygen concentration and a high carbon dioxide concentration, and maintains the freshness of the fruits and vegetables inside. In this package, 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, a large amount of oxygen flows in from the outside, and the freshness of the fruits and vegetables can be maintained for a long period of time. was difficult.

  In order to cope with this problem, there has been proposed a packaged product in which a diagonally extending vent having a width of 3 mm or more is provided in a center seal portion (Patent Document 2). According to this configuration, the length of the ventilation path can be increased.

Japanese Patent No. 3259166 Japanese Patent No. 6052729

  However, in the configuration of Reference 2, since the width of the passage opening (flow passage) is relatively large, 3 mm or more, dew condensation easily occurs in the ventilation opening. As a result, there is a problem that the internal space of the vent is blocked by the moisture generated by the dew, the flow of air in the vent is obstructed, and the freshness cannot be sufficiently maintained.

  Further, in each of the configurations of Patent Literature 1 and Patent Literature 2, since the air passage is configured to extend linearly at the seal portion, the strength of the seal portion in the direction in which the air passage extends is reduced. there were.

  Further, in each of the configurations of Patent Literature 1 and Patent Literature 2, since the air passage is formed by heat sealing, there is a problem that it is difficult to accurately control the width and shape of the formed air passage.

  Furthermore, it has been required to solve the same problem in a packaging material other than the bag-shaped packaging described in the above-mentioned patent document.

  The present invention has been made in view of such a point, the inflow of oxygen from the outside is very small, a freshness holding container capable of maintaining the freshness of the contents for a long time, a member for forming a freshness holding container, and It is an object of the present invention to provide a manufacturing method thereof.

According to the present invention,
A freshness holding container having a ventilation part,
The ventilation portion includes a band-shaped joining region having a width of 5 mm or more and 15 mm or less, where two ends of the film are overlapped and joined,
The bonding region is constituted by a band-shaped ultrasonic bonding portion in which two ends of the film are bonded to each other,
A non-joining portion where the ends of the superposed films are not joined to each other in the ultrasonic joining portion is arranged,
The non-joining portion constitutes a non-linear air passage communicating the internal space of the container and the outside of the container,
The air passage has a width W of 0.2 mm ≦ W ≦ 3 mm and a length L of 20 mm ≦ L ≦ 50 mm.
A freshness preserving container is provided.

According to such a configuration,
The ventilation path has a width W of 0.2 mm ≦ W ≦ 3 mm and a length L of 20 mm ≦ L ≦ 50 mm. Carbon and water vapor can be quickly discharged to the outside through the ventilation path.
Further, since the ventilation path is non-linear, a decrease in the strength of the joint region due to the ventilation path formed by the non-joined portion is suppressed.

According to another preferred embodiment of the present invention,
The film has an oxygen barrier layer.

According to another preferred embodiment of the present invention,
The film has a thickness of 20 μm or more and 100 μm or less.

According to another preferred embodiment of the present invention,
The container has a container body and a lid attached to the container body,
A vent is provided in at least one of the container body and the lid.

According to another preferred embodiment of the present invention,
The lid is detachable from the container body.

According to such a configuration,
A container having a detachable lid makes it possible to maintain the freshness of the contents for a long time.

According to another aspect of the present invention,
A freshness holding container forming member for forming a freshness holding container,
It has a ventilation part,
The ventilation portion includes a band-shaped joining region having a width of 5 mm or more and 15 mm or less, where two ends of the film are overlapped and joined,
The bonding region is constituted by a band-shaped ultrasonic bonding portion in which two ends of the film are bonded to each other, and non-bonding in which the ends of the superimposed film are not bonded to the ultrasonic bonding portion. Department is arranged,
The non-joining portion constitutes a non-linear air passage communicating the internal space of the container and the outside of the container,
The air passage has a width W of 0.2 mm ≦ W ≦ 3 mm and a length L of 20 mm ≦ L ≦ 50 mm.
A member for constituting a freshness holding container is provided.

According to such a configuration,
Since the member for forming a freshness holding container has a ventilation portion provided with a ventilation path, the intrusion of oxygen through the ventilation path is suppressed by attaching such a member for forming a freshness holding container to the opening of the container. However, it is possible to configure a freshness holding container that can quickly discharge carbon dioxide and water vapor generated inside the container to the outside through the ventilation path.

According to another preferred embodiment of the present invention,
A member for constituting a freshness holding container is configured to be detachable from the container.

According to such a configuration,
For example, when the member for forming a freshness holding container is deteriorated over time, it is possible to replace the member for forming a freshness holding container to recover the initial performance.

According to another aspect of the present invention,
A freshness holding container forming member formed of a plurality of films and having a ventilation portion, wherein the ventilation portion has a band-shaped joining region having a width of 5 mm or more and 15 mm or less in which two ends of the film are overlapped and joined. Wherein the bonding region is constituted by a band-shaped ultrasonic bonding portion in which two ends of the film are bonded to each other, and the ends of the superimposed film are bonded to the ultrasonic bonding portion. The non-joined part is arranged, and the non-joined part constitutes a non-linear air passage communicating the internal space of the container and the outside of the container, and the air passage has a width W of 0.2 mm. ≦ W ≦ 3 mm, and the length L is a method for producing a member for forming a freshness holding container, wherein 20 mm ≦ L ≦ 50 mm,
Forming the ultrasonic joint by ultrasonic welding,
A method for producing a member for forming a freshness holding container is provided.

According to such a configuration,
Manufacture a member for forming a freshness holding container for forming a container capable of rapidly discharging carbon dioxide and water vapor generated in the container to the outside through the air passage while suppressing intrusion of oxygen through the air passage. It becomes possible.
Further, since the ventilation path is non-linear, a decrease in the strength of the joint region due to the ventilation path formed by the non-joined portion is suppressed.

According to another preferred embodiment of the present invention,
The step of forming the ultrasonic bonding part is a step of continuously forming an ultrasonic bonding part in the film while rotating a disk-shaped ultrasonic welding horn with respect to the film.

According to such a configuration,
It is possible to manufacture a freshness holding container forming member having an air passage in large quantities and at low cost.

  ADVANTAGE OF THE INVENTION According to this invention, the inflow of oxygen from the outside of a container is very small, and the freshness holding container which can maintain the freshness of the content for a long period of time, a member for constituting a freshness holding container, and a manufacturing method thereof are provided.

It is a schematic plan view of container 100 of a preferred embodiment of the present invention. FIG. 2 is a sectional view taken along the line II-II of FIG. 1. It is a schematic plan view of the ventilation part of the lid part of the container of FIG. FIG. 4 is a schematic sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a schematic sectional view taken along line VV of FIG. 3. It is a schematic diagram which shows the modification of a non-joining part (airway). It is a schematic diagram which shows the modification of a non-joining part (airway). It is a schematic diagram which shows the modification of a non-joining part (airway). It is a schematic diagram which shows the modification of a non-joining part (airway). It is a schematic diagram which shows the modification of a non-joining part (airway). It is a drawing which shows typically the structure of the welding apparatus used for an ultrasonic welding method. It is a typical perspective view which shows the external appearance of the welding horn of the welding apparatus of FIG. It is a typical perspective view of the container of other embodiments of the present invention. It is a typical perspective view of the container of yet another embodiment of the present invention. FIG. 4 is a schematic plan view of a ventilation member (a member for configuring a freshness holding container). It is a schematic diagram explaining attachment of a ventilation member (a member for freshness holding container construction) to a container. It is a schematic diagram for explaining the Example of this invention. It is a schematic diagram for explaining the Example of this invention.

  Hereinafter, the configuration of a container 100 that is a freshness holding container according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic plan view of a container 100 according to a preferred embodiment of the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. In the present application, the ratio of dimensions of each element is not accurately illustrated in the drawings for clarity.

  In this embodiment, the container 100 is, for example, a cylindrical container for storing foods such as coffee, miso, and kimchi, and has a box-shaped main body (container main body) 102 having an open upper end, and an open end of the main body 102 is sealed. And a lid portion 104 that covers in a state. The lid 104 is formed of a film-like member, is adhered and fixed to the main body 102 along the opening end of the main body 102 with an adhesive or the like, and is configured so that the inside of the container can be maintained in a sealed state.

  The main body 102 of the present embodiment is a box-shaped main body having an open upper end, but may have another shape, for example, a cylindrical shape with a bottom as long as the upper end is open. There is no limitation on the size.

  Further, the material constituting the main body 102 of the present embodiment is not particularly limited as long as it has a property of not allowing gas to permeate. Further, the material constituting the main body 102 of the container 100 of the present embodiment may be transparent or opaque, and may have a surface printed to enhance the design. As a material constituting the main body 102 of the container 100 of the present embodiment, for example, polymers such as polyethylene, polypropylene, polystyrene, and polyester, glass, and metal are used.

  The thickness of the main body 102 of the container 100 of the present embodiment is not limited, but is preferably, for example, about 0.3 mm to 3 mm.

  In the container 100 according to the present embodiment, the lid portion 104 is constituted by the film 106, specifically, two films 106a and 106b. As shown in FIGS. 1 and 2, each of the films 106a and 106b has an area of about two-thirds of the area of the opening end of the main body 102, and one end side is overlapped. By being joined, a large number of lids 104 are formed to cover the entire open end of the main body 102. The lid may be formed of three or more films.

  As shown in FIGS. 1 and 2, in the container 100 of the present embodiment, a band-shaped ultrasonic bonding is performed in such a manner that a bonding region in which one end sides of two films 106 a and 106 b are overlapped and bonded. It is constituted by a unit 108.

  The film 106 used in the container 100 of the present embodiment is preferably an amorphous polymer film. Specific examples include films of polystyrene, acrylic resin, vinyl chloride, polycarbonate, styrene acrylonitrile copolymer, and the like.

  The film 106 may be a laminated film in which a plurality of films made of different materials are laminated. Examples of the laminated film include a laminated film in which a polystyrene film is laminated inside a polyester, polyethylene or polypropylene film.

  As the film 106, a film obtained by laminating an oxygen barrier film and another film can be used. As the oxygen barrier film, a known film such as a film made of a polymer containing vinyl alcohol or vinylidene chloride as a constituent, a polymer film on which any one of silica, alumina and aluminum is 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 as the films 106a and 106b.

  Film 106 may be transparent or opaque. When the contents deteriorate due to sunlight, it is preferable to use an opaque packaging film. Further, a film whose surface is printed to enhance the design property may be used.

  The thickness of the film 106 is preferably from 10 μm to 300 μm, more preferably from 15 μm to 200 μm, and still more preferably from 20 μm to 100 μm. If the thickness of the film is less than 10 μm, the strength of the container may be insufficient, and if it exceeds 300 μm, the cost may be disadvantageous.

  In the container 100 of the present embodiment, the width X is set to 5 mm or more and 15 mm or less in the band-like ultrasonic bonding portion 108 in which one end sides of the two films 106 a and 106 b are overlapped and bonded. . The width of the ultrasonic bonding portion 108 is more preferably 6 mm or more and 13 mm or less, and further preferably 8 mm or more and 11 mm or less.

  By setting the width of the ultrasonic bonding portion 108 to 5 mm or more, the storage stability of the contents can be ensured, and by setting the width to 15 mm or less, the strength of the ultrasonic bonding portion can be ensured.

  In the container 100 of the present embodiment, a plurality of portions (non-joined portions) where the one end portions of the two films 106a and 106b are not joined to each other are formed at predetermined intervals in the belt-shaped ultrasonic joining portion 108, This non-joined part constitutes the ventilation path 110. In the container 100 of the present embodiment, the joining area where the plurality of ventilation paths 110 are arranged in the belt-shaped ultrasonic joining section 108 constitutes the ventilation section.

  FIG. 3 is a schematic plan view of a ventilation portion (joining region) of the lid portion 104, FIG. 4 is a schematic cross-sectional view taken along line IV-IV of FIG. 3, and FIG. FIG. 5 is a schematic sectional view taken along line VV of FIG.

  As shown in FIG. 3, in the container 100 according to the present embodiment, the ventilation path 110 has a non-linear (specifically, substantially S-shaped) planar ventilation having a constant width and a cross-sectional shape. It is a road.

  The non-joining portion (air passage) 110 extends from one end of the ultrasonic joining portion 108 to the other end across the band-shaped ultrasonic joining portion 108 having a width X, and the lid portion 104 is formed by opening the main body 102 of the container 100. When the end is sealed, it is configured to be a flow path that fluidly connects the internal space of the container 100 and the outside of the container 100 (FIG. 5).

  In the container 100 of the present embodiment, the width W of the non-joined portion (air passage) 110 is set to 0.2 mm or more and 3 mm or less. The width W of the ventilation path 110 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.

  By setting the width W of the ventilation passage 110 to 0.2 mm or more and 3.0 mm or less, it is possible to simultaneously release carbon dioxide and water vapor generated inside the container 100 and prevent oxygen from entering the outside of the container 100. become. Further, when the container 100 is moved, it is difficult for the gas to flow inside the ventilation path 110, and it is difficult for oxygen to enter from the outside.

  In the container 100 of the present embodiment, the length L of the ventilation path 110 is set to 20 mm or more and 50 mm or less. In addition, the length L of the ventilation path 110 refers to the length from one end to the other end of the ventilation path 110 along the central axis of the ventilation path 110.

  The length L of the ventilation path 110 is more preferably 22 mm or more and 45 mm or less, and even more preferably 25 mm or more and 40 mm or less.

  In the container 100 of the present embodiment, by setting the length L of the ventilation path 110 to 20 mm or more and 50 mm or less, release of carbon dioxide and water vapor generated inside the container 100 and prevention of intrusion of oxygen from the outside of the container 100 are performed. And are compatible.

  Further, in the container 100 of the present embodiment, the ratio L / W of the length L and the width W of the ventilation path 110 is set to 10 or more and 200 or less. If the ratio L / W of the length L to the width W is less than 10, the storage stability of the contents is significantly deteriorated, and if the ratio exceeds 200, moisture is condensed inside the air passage and carbon dioxide This is because the discharge may be insufficient.

  The ratio L / W of the length L to the width W of the ventilation path 110 is more preferably 15 or more and 150 or less, and further preferably 20 or more and 100 or less.

  Furthermore, in the container 100 of the present embodiment, the interval between the ventilation paths 110 is set to be 1 mm or more and 100 mm or less. By setting the interval between the ventilation paths 110 to 1 mm, an accurate shape of the ventilation path 110 can be secured. Further, by setting the thickness to 30 mm or less, a required number of ventilation paths 110 can be provided.

  The interval between the ventilation paths 110 is more preferably 2 mm or more and 50 mm or less, and still more preferably 3 mm or more and 15 mm or less.

  In the container 100 of the present embodiment, the number of the ventilation paths 110 formed in the container 100 is set to one or more, but is preferably 3 or more and 100 or less, more preferably 5 or more and 75 or less.

  In particular, when storing fruits and vegetables that generate a relatively large amount of carbon dioxide during storage, the number of ventilation paths is set to 3 or more and 100 or less, more preferably 5 or more and 75 or less, so that the ventilation paths 110 It is possible to prevent the carbon dioxide from being blocked by water and insufficient discharge of carbon dioxide, which is preferable.

  6 to 10 are schematic drawings showing modified examples of the shape of the non-linear air passage 110. FIG. The shape of the air passage is not limited to the substantially S-shape of the above embodiment. For example, an “V” -shaped air passage 110-6 as shown in FIG. 6, a substantially “Z” -shaped air passage 110-7 as shown in FIG. 7, and an inverted “W” character as shown in FIG. A plurality of linear portions or curved portions are connected as in a ventilated passageway 110-8, an arcuate ventilated passageway 110-9 as shown in FIG. 9, and a wavy ventilated passageway 110-10 as shown in FIG. It may be constituted by the above.

  Furthermore, the ventilation path of the present invention is not limited to the above specific example, and may be another polygonal line, a curved line, or another non-linear ventilation path combining these.

  Next, a method of manufacturing the lid portion 104 having the ventilation path of the container 100 according to the embodiment of the present invention will be described. In the manufacturing method of the present embodiment, the side ends of the two films 106a and 106b are partially joined by an ultrasonic welding method to form a film member to be the lid 104.

  In the manufacturing method of the present embodiment, first, two elongated films 106a and 106b constituting the lid 104 are prepared. Next, both side edges of the two films 106a and 106b are overlapped.

  Next, at least both side edges of the superposed films 106a and 106b are heated to a predetermined temperature (30 to 75 degrees Celsius). Heating is preferably performed by a method such as a heating roll or infrared heating.

  Next, static electricity is removed from the heated film. Since the heated film has a reduced elastic modulus and becomes pliable, it is easily charged due to an increase in the contact area when it comes into contact with an object such as a transport roll. In order to eliminate this charging, it is preferable to remove the charge before the ultrasonic welding.

  Specifically, 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 becomes 1 kv or less. The surface potential can be measured by, for example, a surface potential meter Model 341B manufactured by Trek Japan. By performing static elimination, adhesion of dust due to such charging is suppressed.

  It is preferable that the surface potential of the film after static elimination has an absolute value of 1 kV or less from the viewpoint of preventing dust. The surface potential can be measured by, for example, a surface potential meter Model 341B manufactured by Trek Japan.

  Next, the side ends of the superposed films 106a and 106b are joined by heat sealing or the like, and the side ends of the superposed films 106a and 106b are temporarily fixed so that their relative positions do not shift. By this temporary fastening, the relative positional shift of the superposed films 106a and 106b is prevented.

  Next, a joining portion by the ultrasonic joining portion 108 is formed at the side end portions of the films 106a and 106b by an ultrasonic welding method.

FIG. 11 is a drawing schematically showing a configuration of a welding device 200 used for the ultrasonic welding method.
As shown in FIG. 11, the welding apparatus 200 includes an ultrasonic oscillator 202 for converting 50 Hz or 60 Hz commercial electricity into a high frequency signal of about 15 to 70 KHz, and a converter 204 for converting the signal into mechanical vibration. A booster 206 for amplifying the mechanical vibration, a horn 208 for transmitting the amplified vibration to a welding target (the films 106a and 106b), and a receiving seat 210 for holding the film between the horn 208. I have. It is preferable that the receiving seat 210 can control the temperature.

  FIG. 12 is a schematic perspective view showing the appearance of the welding horn 208 of the welding device of FIG. The welding device 200 of this embodiment is a rotary welding device in which the horn 208 has a disk shape as shown in FIG. The diameter of the disk-shaped horn 208 is about 5 to 30 cm, and the thickness is about 0.5 to 1.5 cm.

  On the outer peripheral surface 208a of the disc-shaped horn 208, an S-shaped groove 208b corresponding to the substantially S-shaped shape of the air passage 110 of the lid 104 is formed, and the non-joined portion (air passage 110) is formed by the groove 208b. Is formed.

  In the welding operation using the rotary welding device 200, the ultrasonic welding portion 8 is continuously formed on the films 106a and 106b. More specifically, the disc-shaped horn 208 is rotated with the films 106a and 106b overlapped between the horn 208 and the receiving seat 210, and the side ends of the long films 106a and 106b are rotated. Next, an ultrasonic welding portion (joining portion) 108 in which a plurality of non-joining portions (air passages 110) are disposed is formed in a belt shape.

  The amplitude of the ultrasonic wave used in the welding operation is usually 1.5 μm or more and 100 μm or less, but from the viewpoint of accurately controlling the width of the non-joined portion W, 2 μm or more, 15 μm or less, more preferably 2.5 μm or more and 10 μm or less. It is preferred that there be.

  The welding is performed by applying ultrasonic vibration to the superimposed films 106a and 106b while the tip of the horn 208 is pressed against the side edges of the superimposed films 106a and 106b. At this time, the welding time is usually 0.05 seconds or more and 1 second or less. If the time is less than 0.05 seconds, the strength of the bag may be insufficient, and if it exceeds 1 second, the production efficiency may be reduced.

  The pressing pressure of the horn 208 is preferably about 100 to 500N. If the pressing pressure is less than 100 N, the strength of the welded portion may decrease, and if it exceeds 500 N, a problem may occur due to an excessive load applied to the device.

  In the manufacturing method using such a horn, the outer peripheral portions of the horns are continuously brought into contact with the side edges of the two superposed films 106a and 106b and ultrasonic welding is performed. And efficient processing can be performed.

  In this manner, the two films 106a and 106b having the air passage formed at the joined side end are appropriately cut, and the lid 104 is adhered and fixed to the opening end of the main body 102 with an adhesive or the like. Becomes

  The container 100 of the above embodiment is a container in which a ventilation portion is provided in a lid portion 104 adhered to an opening end of a main body 102 having an open upper end. The present invention is shown in FIGS. A configuration in which a ventilation portion is provided on at least one of the main body and the lid portion of the container in which the lid portion is configured to be detachable from the main body.

  FIG. 13 is a schematic perspective view of a container 300 according to another embodiment of the present invention, and FIG. 14 is a schematic perspective view of a container 400 according to still another embodiment.

  The container 300 for keeping freshness shown in FIG. 13 includes a bottomed cylindrical main body 302 having an open upper end, and a lid 304 detachably attached to the upper end of the main body 302 at the opening. . In this container 300, it is preferable that the lid 304 is also made of a rigid material.

  In the container 300, an opening 306 is formed in a side wall of the main body 302, and a ventilation member 308 formed of a film is attached to the opening 306 in a sealed state. The ventilation member 308 is formed from two films or the like whose side ends are joined by ultrasonic fusion, and has a ventilation portion in which a plurality of ventilation paths are arranged in a joint region (ultrasonic joint).

  Specifically, the ventilation member 308 has the same configuration as the lid 104 of the container 100 of the above-described embodiment, and has a ventilation path 310 formed by a non-joined portion of a film similar to the ventilation path 110 of the lid 104. It has. With such a configuration, carbon dioxide, water vapor, and the like generated in the container can be discharged to the outside of the container while suppressing intrusion of oxygen from the outside into the container 300.

  Further, the container 400 for maintaining freshness shown in FIG. 14 includes a bottomed cylindrical main body 402 having an open upper end, and a lid portion 404 detachably attached to the upper end of the main body 402. . Also in this container 400, it is preferable that the lid 404 is also made of a rigid material.

  In the container 300, an opening 406 is formed in the lid 404, and a ventilation member 408 formed of a film is attached to the opening 406 in a sealed state. The ventilation member 408 includes a ventilation portion having a ventilation passage 410 formed by a non-joined portion of a film similar to the ventilation passage 110 of the lid portion 104, similarly to the ventilation member 308 of the above embodiment. With such a configuration, carbon dioxide, water vapor, and the like generated in the container can be discharged to the outside of the container while suppressing intrusion of oxygen from the outside into the container 400.

  These ventilation members 308 and 408 are also manufactured using the rotary welding device 200 by the same manufacturing method as the lid 104 of the container 100 of the above-described embodiment.

  Further, such containers 300, 400 and the like are configured such that when the ventilation members 308, 408 are deteriorated by use, the deteriorated ventilation members can be replaced with another new ventilation member (member for forming a freshness holding container). can do.

  Such a replaceable ventilation member (member for forming a freshness holding container) 500 has substantially the same configuration as the ventilation members 308 and 408, and is a rotary type like the lid 104 of the container 100 of the above embodiment. Manufactured by the welding apparatus 200 and the like.

FIG. 15 is a schematic plan view of a ventilation member (member for forming a freshness holding container) 500, and FIG. 16 is a schematic diagram for explaining attachment of the ventilation member (member for forming a freshness holding container) 500 to the container. is there.
The ventilation member (member for forming a freshness holding container) 500 is composed of two films 506a, 506b, etc., whose ends are ultrasonically bonded. A ventilation path 510 similar to the ventilation paths 310 and 410 of the ventilation members 308 and 408 is formed as a non-bonded portion in a joint region between the two films. Further, as shown in FIG. 15, an adhesive layer 502 is formed on the periphery of the back surface.

  Then, as shown in FIG. 16, the ventilation member (member for forming a freshness holding container) 500 covers the opening 406 of the lid 404 detachable from the main body 402 of the container 400 as shown in FIG. 16. It is attached to the opening 406. As a result, it is possible to discharge carbon dioxide, water vapor, and the like generated in the container to the outside of the container through the ventilation path while suppressing the intrusion of oxygen from the outside into the container.

  The material constituting the adhesive layer 502 is not particularly limited, but a known adhesive such as a rubber or acrylic material is preferable. If necessary, a release paper or a release film may be attached on the adhesive layer 502.

  Such a ventilation member (member for forming a freshness holding container) 500 is used by being attached to a container. When the performance deteriorates due to aging, it is replaced with a new ventilation member (member for forming a freshness holding container) 500.

  An opening may be formed in a general closed container, and such a ventilation member (member for forming a freshness holding container) 500 may be attached to constitute a freshness holding container.

  The present invention is not limited to the above embodiment, and various changes and modifications are possible within the scope of the technical idea described in the claims.

  Hereinafter, the present invention will be described in more detail with reference to Examples.

(Example 1)
The two films 106a 'and 106b' of the styrene acrylonitrile copolymer having a thickness of 20 μm were joined by an ultrasonic welding method using the apparatus of FIG. 11 to form an ultrasonic joint 108 'having a width of 10 mm (FIG. 17). The oscillation frequency during joining was 20 KHz, the oscillation amplitude was 15 μm, the pressing pressure was 250 N, and the joining time was 0.2 seconds.

  The ventilation path is the ventilation path 110-7 shown in the polygonal-shaped ventilation path in FIG. 7, and the interval between the ventilation paths is 10 mm. The width of the ventilation path is 0.8 mm, the width L of the ventilation path is 24 mm, and the value of L / W is 30. When the air passage was visually observed, the width of the air passage was constant. The film with the air passage was cut into a circle having a diameter of 15 cm as shown in FIG. This was used as the lid 104 '.

On the other hand, after approximately 800 g of carrots were placed in a substantially cylindrical polypropylene body having a diameter of 15 cm and a depth of 10 cm, the lid 104 ′ was adhered to the opening of the body using an adhesive.
This container was stored in an atmosphere at 15 ° C. for 2 weeks, but the carbon dioxide generated did not swell the lid 104 ′. In addition, there was no change in the appearance of the carrot inside, and the carrot was edible.

(Example 2)
An air passage was formed in the same manner as in Example 1. The shape of the air passage is a curved shape shown in FIG. 3, and the interval between the air passages is 10 mm. The width of the ventilation path is 0.8 mm, the width L of the ventilation path is 32 mm, and the value of L / W is 40. Visual observation of the air passage revealed that the width of the air passage was constant. This film with a ventilation path was cut into a rectangle having a width of 4 cm and a length of 7 cm, and this was used as a ventilation section.

  On the other hand, a substantially rectangular parallelepiped container with a lid having a length of 10 cm, a width of 20 cm, and a height of 10 cm was prepared. The lid is also made of polyethylene and can be attached and detached, and when the lid is closed, the inside can be sealed. A rectangular hole having a width of 3 cm and a length of 6 cm was formed in the center of the lid, and a ventilation portion was adhered to the hole using an adhesive to form a container. After about 200 g of carrot was put in the container, it was sealed.

  This container was stored for 2 weeks in an atmosphere of 15 ° C., but the carbon dioxide generated did not swell the lid. In addition, there was no change in the appearance of the carrot inside, and the carrot was edible.

(Example 3)
A ventilation member (member for forming a freshness holding container) shown in FIG. 15 and having a length of 5 cm and a width of 10 cm was formed. The width of the ultrasonic bonding portion 108 by the ultrasonic welding method was set to 10 mm. The shape of the ventilation path 110 was a curve as shown in FIG. 3, the width was 0.8 mm, the width L was 32 mm, the L / W was 40, and the interval between the ventilation paths was 10 mm. An adhesive layer having a width of 5 mm was provided around the rear surface, and release paper was attached to the entire rear surface.

  On the other hand, the same container as in Example 2 was prepared. The release paper of the member for forming a freshness holding container was peeled off, and the member for forming a freshness holding container was stuck so as to cover the hole of the container to form a freshness holding container.

After about 200 g of carrot was put in this container, it was sealed.
This container was stored for 2 weeks in an atmosphere of 15 ° C., but the carbon dioxide generated did not swell the lid. In addition, there was no change in the appearance of the carrot inside, and the carrot was edible.

100: Container 102: Main body 104: Lids 106, 106a, 106b: Film 108: Ultrasonic joint (joining area)
110: Ventilation path (non-joined part)

Claims (9)

A freshness holding container having a ventilation part,
The ventilation portion includes a band-shaped joining region having a width of 5 mm or more and 15 mm or less, where two ends of the film are overlapped and joined,
The bonding region is constituted by a band-shaped ultrasonic bonding portion in which two ends of the film are bonded to each other,
A non-joining portion where the ends of the superposed films are not joined to each other in the ultrasonic joining portion is arranged,
The non-joining portion constitutes a non-linear air passage communicating the internal space of the container and the outside of the container,
The air passage has a width W of 0.2 mm ≦ W ≦ 3 mm and a length L of 20 mm ≦ L ≦ 50 mm.
A freshness holding container characterized by the above-mentioned. The film has an oxygen barrier layer,
The freshness holding container according to claim 1. The film has a thickness of 20 μm or more and 100 μm or less,
The freshness holding container according to claim 1. The container has a container body and a lid attached to the container body,
A ventilation portion is provided on at least one of the container body and the lid portion,
The freshness holding container according to any one of claims 1 to 3. The lid is detachable from the container body,
The freshness holding container according to claim 4. A freshness holding container forming member for forming a freshness holding container,
It has a ventilation part,
The ventilation portion includes a band-shaped joining region having a width of 5 mm or more and 15 mm or less, where two ends of the film are overlapped and joined,
The bonding region is constituted by a band-shaped ultrasonic bonding portion in which two ends of the film are bonded to each other, and non-bonding in which the ends of the superimposed film are not bonded to the ultrasonic bonding portion. Department is arranged,
The non-joining portion constitutes a non-linear air passage communicating the internal space of the container and the outside of the container,
The air passage has a width W of 0.2 mm ≦ W ≦ 3 mm and a length L of 20 mm ≦ L ≦ 50 mm.
A member for constituting a freshness holding container, characterized by comprising: It is configured to be detachable from the container,
A member for forming a freshness holding container according to claim 6. A freshness holding container forming member formed of a plurality of films and having a ventilation portion, wherein the ventilation portion has a band-shaped joining region having a width of 5 mm or more and 15 mm or less in which two ends of the film are overlapped and joined. Wherein the bonding region is constituted by a band-shaped ultrasonic bonding portion in which two ends of the film are bonded to each other, and the ends of the superimposed film are bonded to the ultrasonic bonding portion. The non-joined part is arranged, and the non-joined part constitutes a non-linear air passage communicating the internal space of the container and the outside of the container, and the air passage has a width W of 0.2 mm. ≦ W ≦ 3 mm, and the length L is a method for producing a member for forming a freshness holding container, wherein 20 mm ≦ L ≦ 50 mm,
Forming the ultrasonic joint by ultrasonic welding,
A method for producing a member for forming a freshness holding container, comprising: The step of forming the ultrasonic bonding portion is a step of continuously forming an ultrasonic bonding portion on the film while rotating a disk-shaped ultrasonic welding horn with respect to the film,
A method for producing the member for forming a freshness holding container according to claim 8.

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