Fruit and vegetable storage container

Abstract

To provide a container for storing fruits and vegetables capable of sufficiently suppressing rotation of the fruits and vegetables during transportation and suppressing damage to the surfaces of the fruits and vegetables. [Solution] A fruit and vegetable storage container 1 for storing fruit and vegetables comprises a storage member 2 made of a foam molded body containing polyethylene terephthalate-based foam resin, and a support container 3 that supports and stores the storage member and is made of a foam molded body containing polyethylene terephthalate-based foam resin. The storage member has a storage section 21 formed in a concave shape for storing fruit and vegetables, and the surface of the storage section is formed with fine irregularities.

Description

[Technical Field]

[0001] The present invention relates to a container for storing fresh produce. [Background technology]

[0002] When transporting fresh produce such as strawberries and tomatoes, they are usually placed in a container and the top side of the container is covered with a packaging film. Packaged produce in this way tends to rotate (also known as ball rotation) within the container due to vibrations during transport, causing the produce to rub against the film and damage the surface of the produce.

[0003] For example, Patent Document 1 proposes a container that includes a thin film made of polyethylene, polypropylene, or the like, and protrusions that support the film from below so that the film is suspended in mid-air. The film is provided with recesses for containing fruits and vegetables, and the fruits and vegetables are contained in the recesses so that they come into close contact with the film, thereby preventing the fruits and vegetables from rolling around as described above. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-96547 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the container described in Patent Document 1 is unable to sufficiently disperse vibrations such as lateral shaking of the suspended fruits and vegetables, and the fruits and vegetables still rotate due to the vibrations, so it cannot be said that damage to the surfaces of the fruits and vegetables is sufficiently prevented. Therefore, there is a demand for a container that can more sufficiently prevent damage to the surfaces of the fruits and vegetables.

[0006] Therefore, the object of the present invention is to provide a fruit and vegetable storage container that can sufficiently prevent the rotation of fruit and vegetables during transportation and prevent damage to the surface of the fruit and vegetables. [Means for solving the problem]

[0007] The fruit and vegetable storage container according to the present invention is: A fruit and vegetable storage container for storing fruit and vegetables, a storage member made of a foamed molded body containing a polyethylene terephthalate-based foamed resin; The storage member has a storage portion formed in a recessed shape for storing the fruits and vegetables, The surface of the housing portion is formed with minute irregularities.

[0008] According to this configuration, the fruit and vegetable storage container of the present invention has a foam molded body that comprises the storage member, which contains a polyethylene terephthalate foam resin, thereby improving the mechanical strength of the storage member and reducing lateral shaking in the storage section, thereby preventing the fruit and vegetable from rolling around. Furthermore, the fruit and vegetable storage container of the present invention has a finely uneven surface on the storage section, which makes it easier for the surface of the fruit and vegetable to catch on the surface of the storage section, thereby fixing the fruit and vegetable by friction inside the storage section and preventing the fruit and vegetable from rolling around. This allows the fruit and vegetable storage container of the present invention to prevent damage to the surface of the fruit and vegetable.

[0009] The fruit and vegetable storage container is The arithmetic mean height (Sa) of the surface of the housing portion is 6.0 μm or more and 30.0 μm or less.

[0010] According to this configuration, the fruit and vegetable storage container of the present invention has an arithmetic mean height (Sa) of the surface of the storage section within the above-mentioned range, which makes it easier for the surface of the fruit and vegetable to be caught on the surface of the storage section, thereby fixing the fruit and vegetable by friction inside the storage section and further preventing the fruit and vegetable from rotating. As a result, the fruit and vegetable storage container of the present invention can further prevent damage to the surface of the fruit and vegetable.

[0011] The fruit and vegetable storage container is The minimum autocorrelation length (Sal) of the surface of the housing portion is 300 μm or more and 800 μm or less.

[0012] According to this configuration, the fruit and vegetable storage container of the present invention has a minimum autocorrelation length (Sal) of the surface of the storage section within the above-mentioned range, which makes it easier for the surface of the fruit and vegetable to be caught on the surface of the storage section, thereby fixing the fruit and vegetable by friction inside the storage section and further preventing the fruit and vegetable from rotating. As a result, the fruit and vegetable storage container of the present invention can further prevent damage to the surface of the fruit and vegetable.

[0013] The fruit and vegetable storage container is The storage member is a storage tray formed in a tray shape, The storage tray is supported and housed in a support container made of a foamed molded body containing a polyethylene terephthalate-based foamed resin, The storage tray has a supported portion for being supported by the support container, The storage tray is supported by the support container, thereby forming a space between the storage section and the support container.

[0014] According to this configuration, the fruit and vegetable storage container of the present invention has good mechanical strength because the foam molding constituting the support container contains polyethylene terephthalate-based foam resin. Therefore, when the storage tray is stored in the support container, lateral shaking in the storage section is further reduced, thereby further suppressing the rotation of fruit and vegetables. Furthermore, by supporting the storage tray on the support container, a space is formed between the storage section and the support container, which reduces vibrations transmitted to the storage section, further suppressing the rotation of fruit and vegetables. This allows the fruit and vegetable storage container of the present invention to further suppress damage to the surface of fruit and vegetables.

[0015] The fruit and vegetable storage container is The container has a container bottom and a container sidewall, The arithmetic mean height (Sa) of the surface of the container bottom is 6.0 μm or more and 30.0 μm or less.

[0016] According to this configuration, the fruit and vegetable storage container of the present invention has an arithmetic mean height (Sa) of the surface of the storage bottom within the above-mentioned range, which makes it easier for the surface of the fruit and vegetable to be caught on the surface of the storage bottom, thereby fixing the fruit and vegetable by friction inside the storage portion and further preventing the fruit and vegetable from rotating. As a result, the fruit and vegetable storage container of the present invention can further prevent damage to the surface of the fruit and vegetable.

[0017] The fruit and vegetable storage container is The container has a container bottom and a container sidewall, The minimum autocorrelation length (Sal) of the surface of the storage bottom is 300 μm or more and 800 μm or less.

[0018] According to this configuration, the fruit and vegetable storage container of the present invention has a minimum autocorrelation length (Sal) of the surface of the storage bottom within the above range, which makes it easier for the surface of the fruit and vegetable to be caught on the surface of the storage bottom, thereby further fixing the fruit and vegetable by friction inside the storage section and further preventing the fruit and vegetable from rotating. As a result, the fruit and vegetable storage container of the present invention can further prevent damage to the surface of the fruit and vegetable.

[0019] The fruit and vegetable storage container is The container has a container bottom and a container sidewall, The thickness of the storage bottom is 0.15 mm or more and 1.00 mm or less, The thickness of the housing side wall portion is 0.20 mm or more and 1.10 mm or less.

[0020] With this configuration, the fruit and vegetable storage container according to the present invention has a bottom thickness within the above range, which provides cushioning to the bottom and further reduces vertical vibrations, and the side walls have a thickness within the above range, which improves the mechanical strength of the side walls and further reduces lateral shaking in the storage section, thereby further reducing the rotation of the fruit and vegetable.As a result, the fruit and vegetable storage container according to the present invention can further reduce surface damage to the fruit and vegetable.

[0021] The fruit and vegetable storage container is the storage tray has a support portion that supports the storage portion on the supported portion, The support portion is formed to be harder than the accommodation portion.

[0022] According to this configuration, the fruit and vegetable storage container of the present invention has a support portion that is harder than the storage portion, and the storage portion is fixed by the support portion, which has a higher mechanical strength than the storage portion, thereby further reducing lateral shaking in the storage portion and further suppressing the rotation of the fruit and vegetable. As a result, the fruit and vegetable storage container of the present invention can further prevent damage to the surface of the fruit and vegetable.

[0023] The fruit and vegetable storage container is The surface of the support portion is formed with minute irregularities.

[0024] According to this configuration, the fruit and vegetable storage container of the present invention has fine irregularities formed on the surface of the support part, making the storage tray less slippery when picked up, making it easier to handle.

[0025] The fruit and vegetable storage container is The arithmetic mean height (Sa) of the surface of the support portion is 3.0 μm or more and 20.0 μm or less.

[0026] According to this configuration, the fruit and vegetable storage container of the present invention has an arithmetic mean height (Sa) of the surface of the support portion within the above numerical range, making the storage tray less slippery when picked up and easier to handle.

[0027] The fruit and vegetable storage container is The minimum autocorrelation length (Sal) of the surface of the support portion is 200 μm or more and 700 μm or less.

[0028] According to this configuration, the fruit and vegetable storage container of the present invention has a minimum autocorrelation length (Sal) of the surface of the support portion within the above-mentioned numerical range, making the storage tray less slippery when picked up and easier to handle.

[0029] The fruit and vegetable storage container is The thickness of the support portion is 0.50 mm or more and 2.00 mm or less.

[0030] According to this configuration, the fruit and vegetable storage container of the present invention has a thickness of the support portion within the above range, which improves the mechanical strength of the support portion and further reduces lateral shaking in the storage portion, thereby further preventing the fruit and vegetable from rotating. As a result, the fruit and vegetable storage container of the present invention can further prevent damage to the surface of the fruit and vegetable.

[0031] The fruit and vegetable storage container is The housing member is formed of a foam molded body made only of polyethylene terephthalate-based foam resin.

[0032] According to this configuration, the fruit and vegetable storage container of the present invention has a storage member made of a foam molded body consisting only of a polyethylene terephthalate-based foam resin, which further improves the mechanical strength of the storage member and further reduces lateral shaking in the storage section, thereby further preventing the fruit and vegetable from rotating.As a result, the fruit and vegetable storage container of the present invention can further prevent damage to the surface of the fruit and vegetable.

[0033] The fruit and vegetable storage container is The support container is formed of a foam molded article made solely of a polyethylene terephthalate foam resin.

[0034] According to this configuration, the fruit and vegetable storage container of the present invention has a support container made of a foam molded body made only of polyethylene terephthalate-based foam resin, which further improves the mechanical strength of the support container and further reduces lateral shaking in the storage section, thereby further preventing the fruit and vegetable from rotating.As a result, the fruit and vegetable storage container of the present invention can further prevent damage to the surface of the fruit and vegetable. [Effects of the Invention]

[0035] According to the present invention, it is possible to provide a fruit and vegetable storage container that can sufficiently prevent the rotation of fruit and vegetables during transportation and prevent damage to the surface of the fruit and vegetables. [Brief explanation of the drawings]

[0036] [Figure 1] FIG. 1 is an exploded perspective view of a fruit and vegetable storage container 1 according to this embodiment. [Figure 2] FIG. 2 is a perspective view of the receiving tray 2 according to this embodiment. [Figure 3] FIG. 3 is a front view of the receiving tray 2 according to this embodiment. [Figure 4] FIG. 4 is a perspective view of the support container 3 according to this embodiment. [Figure 5] FIG. 5 is a reference diagram of the fruit and vegetable storage container 1 according to this embodiment in a state in which the storage tray 2 is stored in the support container 3. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0037] [Fruit and vegetable storage container] Hereinafter, a fruit and vegetable storage container 1 according to an embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiment.

[0038] The fruit and vegetable storage container 1 according to this embodiment is a container for storing strawberries, which are fruit and vegetables.

[0039] As shown in Figure 1, the fruit and vegetable storage container 1 of this embodiment comprises a storage member 2 made of a foam molded body containing a polyethylene terephthalate-based foam resin, and a support container 3 that supports and stores the storage member 2 and is made of a foam molded body containing a polyethylene terephthalate-based foam resin.

[0040] (housing member) In the fruit and vegetable storage container 1 according to this embodiment, the storage member 2 is a storage tray 2 formed in a tray shape. The storage tray 2 is formed in a substantially rectangular shape in a plan view.

[0041] As shown in Fig. 2, the storage member 2 has a storage section 21 formed in a concave shape for storing the fruit and vegetables, a supported section 22 for being supported by the support container 3, and a support section 23 for supporting the storage section 21 on the supported section 22. As shown in Fig. 3, the storage section 21 according to this embodiment is formed in a concave shape by a portion of the storage tray 2 extending vertically downward. The support section 23 according to this embodiment is formed in a substantially flat shape in an area of ​​the storage tray 2 where the storage section 21 is not formed. The support section 23 is formed to be harder than the storage section 21. The support section 23 may be formed to be thicker than the storage section 21, thereby making it harder than the storage section 21.

[0042] As used herein, the terms "concave" and "substantially flat" refer to a macroscopic shape. Therefore, the terms "concave" and "substantially flat" do not indicate that irregularities are not formed as a microscopic shape.

[0043] 2, the storage tray 2 according to this embodiment has eleven storage sections 21. More specifically, the storage tray 2 has the storage sections 21 formed in three rows aligned in the longitudinal direction of the storage tray 2. The storage sections 21 are formed in two rows of four aligned on both ends of the storage tray 2 in the transverse direction, and in one row of three aligned in the center of the storage tray 2 in the transverse direction.

[0044] The shapes of the storage section 21 in front, side and plan views are formed to correspond to the shapes of the fruits and vegetables to be stored. In the storage tray 2 according to this embodiment, the shapes of the storage section 21 in front, side and plan views are formed to correspond to the shape of strawberries.

[0045] The surface of the storage section 21 is formed with minute irregularities. That is, the surface of the storage section 21 is formed in a matte finish. The surface of the storage section 21 refers to the surface of the storage section 21 that comes into contact with fresh produce such as strawberries. Therefore, when the storage member 2 is a storage tray 2, the surface of the storage section 21 is not the outer surface of the storage section 21 but the inner surface of the storage section 21.

[0046] Fine irregularities may be formed on the surface of the storage section 21 by setting the arithmetic mean height (Sa) of the surface of the storage section 21 within a specific numerical range. The arithmetic mean height (Sa) of the surface of the storage section 21 is preferably 6.0 μm or more and 30.0 μm or less, more preferably 9.0 μm or more and 28.0 μm or less, and even more preferably 13.0 μm or more and 25.0 μm or less.

[0047] Fine irregularities may be formed on the surface of the accommodating section 21 by setting the minimum autocorrelation length (Sal) of the surface of the accommodating section 21 within a specific numerical range. The minimum autocorrelation length (Sal) of the surface of the accommodating section 21 is preferably 300 μm or more and 800 μm or less, more preferably 350 μm or more and 700 μm or less, and even more preferably 400 μm or more and 600 μm or less.

[0048] The arithmetic mean height (Sa) and minimum autocorrelation length (Sal) of the foaming container surface on the surface of the container part 21 are measured according to the method specified in ISO25178 Surface Properties (Surface Roughness Measurement).

[0049] The arithmetic mean height (Sa) of the foamed container surface on the surface of the storage section 21 can be increased by reducing the basis weight of the polyethylene terephthalate-based resin foam sheet described later, or by adjusting the secondary expansion ratio of the polyethylene terephthalate-based resin foam sheet to be larger in the molding process described later, thereby preventing the polyethylene terephthalate-based resin foam sheet from coming into close contact with the male die of the mold; and can be decreased by increasing the basis weight of the polyethylene terephthalate-based resin foam sheet, or by adjusting the secondary expansion ratio of the polyethylene terephthalate-based resin foam sheet to be smaller in the molding process, thereby preventing the polyethylene terephthalate-based resin foam sheet from coming into close contact with the male die of the mold.

[0050] The minimum autocorrelation length (Sal) on the surface of the storage section 21 can be increased by adjusting the bubble diameter in the foam molded body to be larger in the molding process described below, or can be decreased by adjusting the bubble diameter in the foam molded body to be smaller in the molding process.

[0051] The shore hardness of the housing portion 21 is preferably C60 or more and C85 or less, more preferably C65 or more and C80 or less, and further preferably C69 or more and C76 or less.

[0052] The Shore hardness of the housing portion 21 is measured in accordance with JIS K7312:1996. A Type C durometer is used to measure the Shore hardness. The measurement temperature is 23°C, and the average value of the measurements taken 5 seconds after the pressure plate of the Type C durometer is brought into contact with any five points on the test piece is taken as the Shore hardness.

[0053] The container 21 has a container bottom and a container side wall.

[0054] The storage bottom and the storage side wall are formed to be softer than the support part 23. Because the storage bottom and the storage side wall are formed to be softer than the support part 23, the thickness of the storage bottom and the storage side wall is thinner than the support part 23.

[0055] The storage bottom may be formed to be softer than the storage side wall. Because the storage bottom is formed to be softer than the storage side wall, the thickness of the storage bottom may be thinner than the storage side wall.

[0056] The arithmetic mean height (Sa) of the surface of the container bottom is preferably 6.0 μm or more and 30.0 μm or less, more preferably 9.0 μm or more and 28.0 μm or less, and even more preferably 13.0 μm or more and 25.0 μm or less.

[0057] The minimum autocorrelation length (Sal) of the surface of the storage bottom is preferably 300 μm or more and 800 μm or less, more preferably 350 μm or more and 700 μm or less, and even more preferably 400 μm or more and 600 μm or less.

[0058] The surface of the storage bottom refers to the surface of the storage bottom that comes into contact with fresh produce such as strawberries. Therefore, when the storage member 2 is a storage tray 2, the surface of the storage bottom is not the surface of the storage bottom on the outside of the storage section 21, but the surface of the storage bottom on the inside of the storage section 21.

[0059] The arithmetic mean height (Sa) and minimum autocorrelation length (Sal) of the foaming container surface on the surface of the storage bottom are measured by the same method as the method for measuring the arithmetic mean height (Sa) and minimum autocorrelation length (Sal) of the foaming container surface on the surface of the storage section 21, and are adjusted by the same method as the method for adjusting the arithmetic mean height (Sa) and minimum autocorrelation length (Sal) of the foaming container surface on the surface of the storage section 21.

[0060] The thickness of the container bottom is preferably 0.15 mm or more and 1.00 mm or less, more preferably 0.17 mm or more and 0.80 mm or less, and even more preferably 0.20 mm or more and 0.60 mm or less.

[0061] The thickness of the housing side wall is preferably 0.20 mm or more and 1.10 mm or less, more preferably 0.25 mm or more and 0.95 mm or less, and even more preferably 0.30 mm or more and 0.80 mm or less.

[0062] The thickness of the housing bottom and the housing side wall is measured using a dial thickness gauge SM-112 (manufactured by Teclock).

[0063] Fine irregularities are formed on the surface of the support portion 23. That is, the surface of the support portion 23 is formed in a matte finish.

[0064] Fine irregularities may be formed on the surface of the support portion 23 by setting the arithmetic mean height (Sa) of the surface of the support portion 23 within a specific numerical range. The arithmetic mean height (Sa) of the surface of the support portion 23 is preferably 3.0 μm or more and 20.0 μm or less, more preferably 6.0 μm or more and 18.0 μm or less, and even more preferably 9.0 μm or more and 16.0 μm or less.

[0065] Fine irregularities may be formed on the surface of the support part 23 by setting the minimum autocorrelation length (Sal) of the surface of the support part 23 within a specific numerical range. The minimum autocorrelation length (Sal) of the surface of the support part 23 is preferably 200 μm or more and 700 μm or less, more preferably 230 μm or more and 600 μm or less, and even more preferably 260 μm or more and 500 μm or less.

[0066] The surface of the support portion 23 refers to the surface of the support portion 23 on the same side as the side of the storage portion 21 that comes into contact with fresh produce such as strawberries. Therefore, when the storage member 2 is a storage tray 2, the surface of the support portion 23 is not the surface of the support portion 23 on the same side as the outside of the storage portion 21, but the surface of the support portion 23 on the same side as the inside of the storage portion 21.

[0067] The arithmetic mean height (Sa) and minimum autocorrelation length (Sal) of the foaming container surface on the surface of the support portion 23 are measured by the same method as the method for measuring the arithmetic mean height (Sa) and minimum autocorrelation length (Sal) of the foaming container surface on the surface of the storage portion 21.

[0068] The arithmetic mean height (Sa) of the surface of the foamed container on the surface of the support portion 23 can be increased by reducing the basis weight of the polyethylene terephthalate-based resin foam sheet described later, or by adjusting the secondary expansion ratio of the polyethylene terephthalate-based resin foam sheet to be larger in the molding process described later, and thereby preventing the polyethylene terephthalate-based resin foam sheet from coming into close contact with the male die of the mold; and can be decreased by increasing the basis weight of the polyethylene terephthalate-based resin foam sheet, or by adjusting the secondary expansion ratio of the polyethylene terephthalate-based resin foam sheet to be smaller in the molding process, and thereby preventing the polyethylene terephthalate-based resin foam sheet from coming into close contact with the male die of the mold.

[0069] The minimum autocorrelation length (Sal) on the surface of the support part 23 can be increased by adjusting the bubble diameter in the foam molded body to be larger in the molding process described below, and can be decreased by adjusting the bubble diameter in the foam molded body to be smaller in the molding process.

[0070] The Shore hardness of the support portion 23 is preferably C77 or more and C96 or less, more preferably C80 or more and C93 or less, and further preferably C84 or more and C90 or less. The Shore hardness of the support portion 23 is higher than the Shore hardness of the storage portion 21.

[0071] The Shore hardness of the support portion 23 is measured by the same method as that for the Shore hardness of the housing portion 21 .

[0072] The thickness of the support portion 23 is preferably 0.50 mm or more and 2.00 mm or less, more preferably 0.55 mm or more and 1.60 mm or less, and even more preferably 0.60 mm or more and 1.20 mm or less.

[0073] The thickness of the support portion 23 is measured by the same method as the method for measuring the thickness of the container bottom portion and the container side wall portion.

[0074] The supported portion 22 according to this embodiment is a first mating portion 22 for mating with the opening of the support container 3, which will be described later, and is formed at the outer edge of the storage tray 2 in a plan view, as shown in Fig. 2. More specifically, the first mating portion 22 is formed by the outer side of the storage tray 2 being one step higher in the vertical direction than the inner side around the outer edge of the storage tray 2 in a plan view, and the storage tray 2 extending vertically downward at the outermost edge of the storage tray 2 in a plan view. By forming the first mating portion 22 in this manner, as shown in Fig. 5, in a cross-sectional view of the storage tray 2 viewed from the front, the first mating portion 22 has a substantially inverted U-shape.

[0075] As described above, the storage member 2 is made of a foam molded body containing a polyethylene terephthalate-based foam resin. The storage member 2 is preferably made of a foam molded body made only of a polyethylene terephthalate-based foam resin.

[0076] The polyethylene terephthalate-based foamed resin includes a polyethylene terephthalate-based resin, and may further include a crystallization accelerator and a crosslinking agent.

[0077] The intrinsic viscosity (IV value) of the polyethylene terephthalate resin is preferably 0.50 or more and 1.50 or less, and more preferably 0.90 or more and 1.10 or less.

[0078] The intrinsic viscosity (IV value) of the polyethylene terephthalate resin is measured according to the method specified in JIS K7367-5 (2000).

[0079] The mass average molecular weight of the polyethylene terephthalate resin is preferably 100,000 or more and 500,000 or less, more preferably 150,000 or more and 450,000 or less, and even more preferably 200,000 or more and 400,000 or less.

[0080] The mass average molecular weight of the polyethylene terephthalate resin is calculated based on a calibration curve obtained by measuring the value by gel permeation chromatography (GPC) using standard samples manufactured by Showa Denko K.K. under the product names "STANDARD SM-105" and "STANDARD SH-75."

[0081] The content of the polyethylene terephthalate resin in the foamed molded product is preferably 90% by mass or more and 99.8% by mass or less, and more preferably 94% by mass or more and 99.4% by mass or less, relative to 100% by mass of the foamed molded product.

[0082] Examples of the crystallization accelerator include inorganic crystallization accelerators, organic crystallization accelerators, mixtures thereof, etc. The crystallization accelerator is preferably an inorganic crystallization accelerator.

[0083] Examples of the inorganic crystallization accelerator include silicates, carbon, and metal oxides. Examples of silicates include talc, which is hydrous magnesium silicate. Examples of carbon include carbon black, carbon nanofibers, carbon nanotubes, carbon nanohorns, activated carbon, graphite, graphene, coke, mesoporous carbon, glassy carbon, hard carbon, and soft carbon. Examples of carbon black include furnace black, acetylene black, ketjen black, and thermal black. Examples of metal oxides include zinc oxide and titanium oxide. The inorganic crystallization accelerator is preferably a silicate, and more preferably talc.

[0084] Examples of the organic crystallization accelerator include aliphatic carboxylic acids, such as stearic acid, montanic acid, and salts thereof.

[0085] The content of the crystallization accelerator in the foamed molded product is preferably 0.1% by mass or more and 5% by mass or less, and more preferably 0.5% by mass or more and 3% by mass or less, relative to 100% by mass of the foamed molded product.

[0086] Examples of the crosslinking agent include acid dianhydrides such as pyromellitic anhydride, polyfunctional epoxy compounds, oxazoline compounds, oxazine compounds, etc. The crosslinking agent is preferably an acid dianhydride, and more preferably pyromellitic anhydride.

[0087] The content of the crosslinking agent in the foamed molded product is preferably 0.01% by mass or more and 5% by mass or less, more preferably 0.02% by mass or more and 4% by mass or less, and even more preferably 0.05% by mass or more and 3% by mass or less, relative to 100% by mass of the foamed molded product.

[0088] The foamed molded article may further contain a foamed resin other than a polyethylene terephthalate-based foamed resin, such as a polybutylene terephthalate-based foamed resin, a polyethylene naphthalate-based foamed resin, a polyethylene furanoate-based foamed resin, a polybutylene naphthalate-based foamed resin, a foamed resin of a copolymer of terephthalic acid, ethylene glycol, and cyclohexanedimethanol, a polyethylene-based foamed resin, a polypropylene-based foamed resin, or a polystyrene-based foamed resin.

[0089] The content of foaming resin other than polyethylene terephthalate-based foaming resin in the foamed molded body is preferably 0.2% by mass or more and 10% by mass or less, and more preferably 0.6% by mass or more and 6% by mass or less, relative to 100% by mass of the foamed molded body.

[0090] (Support container) The support container 3 supports the storage tray 2 from below in the vertical direction so that the storage section 21 does not come into contact with the ground or the like. More specifically, as shown in Fig. 4, the support container 3 according to this embodiment is formed in a cylindrical shape with a bottom, has a container bottom 31 and a container side wall 32, and has an opening formed on the vertical upper side. The vertical length of the container side wall 32 is longer than the vertical length of the storage section 21. As a result, as shown in Fig. 5, when the storage tray 2 is locked near the opening, the storage section 21 does not come into contact with the container bottom 31.

[0091] The opening formed in the support container 3 is configured to mate with the outer edge of the storage tray 2. That is, as shown in FIGS. 4 and 5 , the support container 3 according to this embodiment has a second mating portion 33 at the opening, i.e., the vertical upper end of the container peripheral wall, for mating with the storage tray 2. More specifically, the second mating portion 33 is formed by the container peripheral wall extending from the inside to the outside of the support container 3 at the vertical upper end of the container peripheral wall, and the container side wall 32 extending vertically downward at the outermost edge of the support container 3 in a plan view. Because the second mating portion 33 is formed in this manner, as shown in FIG. 5 , in a cross-sectional view of the support container 3 viewed from the front, the second mating portion 33 has a substantially inverted U-shape.

[0092] In the fruit and vegetable storage container 1 according to this embodiment, the storage tray is supported by the support container, thereby forming a space between the storage section and the support container 3. More specifically, the first mating section 22 and the second mating section 33 are mated with each other, thereby supporting the storage tray 2 on the support container 3, thereby forming a space between the storage tray 2 and the support container 3.

[0093] The support container 3 is formed in a substantially rectangular shape when viewed from the front, side, top, and bottom.

[0094] As described above, the support container 3 is made of a foam molded body containing a polyethylene terephthalate-based foam resin. The support container 3 is preferably made of a foam molded body made only of a polyethylene terephthalate-based foam resin.

[0095] The foam molded body in the support container 3 is the same as the foam molded body in the storage member 2. The foam molded body in the storage member 2 and the foam molded body in the support container 3 may be the same foam molded body or may be different foam molded bodies.

[0096] [Manufacturing method for fruit and vegetable storage containers] The method for manufacturing a fruit and vegetable storage container is to manufacture the above-described fruit and vegetable storage container 1.

[0097] A method for manufacturing a fruit and vegetable storage container includes: a sheet-forming step of melt-kneading a polyethylene terephthalate-based resin composition containing a polyethylene terephthalate-based resin with a foaming agent to foam and then curing the composition to obtain a polyethylene terephthalate-based resin foamed sheet; a preheating step of preheating a polyethylene terephthalate-based resin foam sheet; After the preheating step, the method may include a molding step of sandwiching the polyethylene terephthalate resin foam sheet between molds and heat-molding it.

[0098] (Sheet forming process) The sheet-forming step is a step of melt-kneading a polyethylene terephthalate-based resin composition containing a polyethylene terephthalate-based resin and a foaming agent to foam and cure the composition, thereby obtaining a polyethylene terephthalate-based resin foamed sheet.

[0099] The sheet-forming step can be a step used in producing a known foamed sheet, and examples thereof include the following steps.

[0100] In the sheet-forming step, the polyethylene terephthalate resin composition and a foaming agent are fed to an extruder and melt-kneaded to form a molten mixture of the resin composition.

[0101] The molten mixture is extruded and foamed through a circular die attached to the tip of the extruder to obtain a cylindrical foam. The cylindrical foam is expanded in diameter and then fed to a mandrel for cooling. The cooled cylindrical foam is continuously cut and expanded in the extrusion direction between its inner and outer circumferential surfaces to obtain a polyethylene terephthalate resin foam sheet.

[0102] From the viewpoint of suppressing hydrolysis of the polyethylene terephthalate-based resin, the polyethylene terephthalate-based resin is preferably dried in advance before the sheet-forming step is carried out. For example, a dehumidifying dryer or the like is used for drying. Examples of the drying method include a method in which air with a dew point of -30°C is heated to 160°C and the polyethylene terephthalate-based resin is exposed to this air.

[0103] The resin composition includes a polyethylene terephthalate resin. The resin composition may further include the above-mentioned crystallization accelerator and may further include the above-mentioned crosslinking agent.

[0104] (Preheating process) The preheating step is a step of preheating the polyethylene terephthalate resin foam sheet.

[0105] In the preheating step, the polyethylene terephthalate resin foam sheet may be preheated in a heater tank to soften the polyethylene terephthalate resin foam sheet. The temperature of the heater tank is preferably 90 to 180°C, more preferably 100 to 170°C, and even more preferably 105 to 160°C.

[0106] The surface temperature of the preheated polyethylene terephthalate resin foam sheet is preferably 105 to 140°C, more preferably 110 to 135°C, and even more preferably 115 to 130°C.

[0107] The preheating time of the polyethylene terephthalate resin foam sheet in the preheating step is preferably 20 to 90 seconds, more preferably 20 to 85 seconds, and even more preferably 30 to 80 seconds.

[0108] (molding process) The molding step is a step of sandwiching the polyethylene terephthalate resin foam sheet between dies and molding it under heat after the preheating step, thereby obtaining a foamed container of a desired shape.

[0109] Examples of the forming method include vacuum forming and pressure forming. Examples of the vacuum forming and pressure forming include plug forming, free drawing forming, plug and ridge forming, matched mold forming, straight forming, drape forming, reverse draw forming, air slip forming, plug assist forming, and plug assist reverse draw forming. The forming method is preferably pressure forming.

[0110] In the pressure molding, preferably, a male mold and a female mold whose temperature is controlled to 20 to 50°C are used as molds, and compressed air is supplied from the male mold side to bring the preheated polyethylene terephthalate resin foam sheet into close contact with the female mold for 4 to 15 seconds.

[0111] In the pressure molding, when the polyethylene terephthalate resin foam sheet is sandwiched between a male mold and a female mold and heated and molded, a clearance may be formed between the polyethylene terephthalate resin foam sheet and the male mold.

[0112] By implementing the fruit and vegetable storage container 1 according to this embodiment in the above-described manner, it is possible to sufficiently prevent the fruit and vegetable from rotating during transportation, and to prevent damage to the surfaces of the fruit and vegetable.

[0113] In the fruit and vegetable storage container 1 according to this embodiment, the foam molded body constituting the storage member 2 contains a polyethylene terephthalate-based foam resin, which improves the mechanical strength of the storage member 2 and reduces lateral shaking in the storage section 21, thereby preventing the fruit and vegetable from rolling around. Furthermore, in the fruit and vegetable storage container 1 according to this embodiment, the surface of the storage section 21 is formed with fine irregularities, which makes it easier for the surface of the fruit and vegetable to catch on the surface of the storage section 21, allowing the fruit and vegetable to be fixed by friction inside the storage section 21 and preventing the fruit and vegetable from rolling around. As a result, the fruit and vegetable storage container 1 according to this embodiment can prevent scratches on the surface of the fruit and vegetable.

[0114] In the fruit and vegetable storage container 1 according to this embodiment, the arithmetic mean height (Sa) of the surface of the storage section 21 is within the above-mentioned range, so that the surface of the fruit and vegetable and the surface of the storage section 21 can be more easily caught, and therefore the fruit and vegetable can be fixed by friction inside the storage section 21, and the fruit and vegetable can be more effectively prevented from rotating. As a result, the fruit and vegetable storage container 1 according to this embodiment can more effectively prevent damage to the surface of the fruit and vegetable.

[0115] In the fruit and vegetable storage container 1 according to this embodiment, the minimum autocorrelation length (Sal) of the surface of the storage section 21 is in the above-mentioned range, so that the surface of the fruit and vegetable and the surface of the storage section 21 can be more easily caught, and therefore the fruit and vegetable can be fixed by friction inside the storage section 21, and the rotation of the fruit and vegetable can be further suppressed. As a result, the fruit and vegetable storage container 1 according to this embodiment can further suppress damage to the surface of the fruit and vegetable.

[0116] In the fruit and vegetable storage container 1 according to this embodiment, the foam molded body constituting the support container 3 contains a polyethylene terephthalate-based foam resin, which improves the mechanical strength of the support container 3. Therefore, when the storage tray 2 is stored in the support container 3, lateral shaking in the storage section 21 is further reduced, thereby further suppressing the rotation of the fruit and vegetable. Furthermore, since the storage tray 2 is supported by the support container 3, a space is formed between the storage section 21 and the support container 3, which reduces vibrations transmitted to the storage section 21, thereby further suppressing the rotation of the fruit and vegetable. As a result, the fruit and vegetable storage container 1 according to this embodiment can further suppress damage to the surfaces of the fruit and vegetable.

[0117] In the fruit and vegetable storage container 1 according to this embodiment, the arithmetic mean height (Sa) of the surface of the storage bottom is within the above-mentioned range, so that the surface of the fruit and vegetable and the surface of the storage bottom are more likely to catch, and the fruit and vegetable can be fixed by friction inside the storage section 21, further preventing the fruit and vegetable from rotating. As a result, the fruit and vegetable storage container 1 according to this embodiment can further prevent damage to the surface of the fruit and vegetable.

[0118] In the fruit and vegetable storage container 1 according to this embodiment, the minimum autocorrelation length (Sal) of the surface of the storage bottom is in the above-mentioned range, so that the surface of the fruit and vegetable and the surface of the storage bottom are more likely to catch, and therefore the fruit and vegetable can be fixed by friction inside the storage section 21, and the rotation of the fruit and vegetable can be further suppressed. As a result, the fruit and vegetable storage container 1 according to this embodiment can further suppress damage to the surface of the fruit and vegetable.

[0119] In the fruit and vegetable storage container 1 according to this embodiment, since the thickness of the storage bottom is within the above-mentioned range, the storage bottom is provided with cushioning properties, further reducing vibrations in the vertical direction, and since the thickness of the storage side wall is within the above-mentioned range, the mechanical strength of the storage side wall is improved, further reducing lateral shaking in the storage section 21, thereby further suppressing the rotation of fruit and vegetable pieces. As a result, the fruit and vegetable storage container 1 according to this embodiment can further suppress damage to the surfaces of fruit and vegetable pieces.

[0120] In the fruit and vegetable storage container 1 according to this embodiment, the support portion 23 is formed to be harder than the storage portion 21, and therefore the storage portion 21 is fixed by the support portion 23, which has a higher mechanical strength than the storage portion 21, and lateral shaking in the storage portion 21 is further reduced, thereby further suppressing the rotation of the fruit and vegetable. As a result, the fruit and vegetable storage container 1 according to this embodiment can further suppress damage to the surfaces of the fruit and vegetable.

[0121] In the fruit and vegetable storage container 1 of this embodiment, minute irregularities are formed on the surface of the support portion 23, making the storage tray 2 less slippery when picked up, making it easier to handle.

[0122] In the fruit and vegetable storage container 1 of this embodiment, the arithmetic mean height (Sa) of the surface of the support portion 23 is within the above numerical range, making the storage tray 2 less slippery when picked up and therefore easier to handle.

[0123] In the fruit and vegetable storage container 1 of this embodiment, the minimum autocorrelation length (Sal) of the surface of the support portion 23 is in the above-mentioned numerical range, making the storage tray 2 less slippery when picked up and therefore easier to handle.

[0124] In the fruit and vegetable storage container 1 according to this embodiment, the thickness of the support portion 23 is within the above-mentioned range, which improves the mechanical strength of the support portion 23 and further reduces lateral shaking in the storage portion 21, thereby further suppressing the rotation of the fruit and vegetable. As a result, the fruit and vegetable storage container 1 according to this embodiment can further suppress damage to the surfaces of the fruit and vegetable.

[0125] In the fruit and vegetable storage container 1 according to this embodiment, the storage member 2 is made of a foam molded body made only of polyethylene terephthalate-based foam resin, which further improves the mechanical strength of the storage member 2 and further reduces lateral shaking in the storage section 21, thereby further suppressing the rotation of the fruit and vegetable. As a result, the fruit and vegetable storage container 1 according to this embodiment can further suppress damage to the surfaces of the fruit and vegetable.

[0126] In the fruit and vegetable storage container 1 according to this embodiment, the support container 3 is made of a foam molded body made only of polyethylene terephthalate-based foam resin, which further improves the mechanical strength of the support container 3 and further reduces lateral shaking in the storage section 21, thereby further suppressing the rotation of fruit and vegetable pieces. As a result, the fruit and vegetable storage container 1 according to this embodiment can further suppress damage to the surfaces of fruit and vegetable pieces.

[0127] In the fruit and vegetable storage container 1 according to this embodiment, the polyethylene terephthalate resin has an intrinsic viscosity (IV value) within the above range, which facilitates foaming and makes it easier to obtain an extruded foam sheet.

[0128] In the method for manufacturing a fruit and vegetable storage container, by setting the temperature of the heater tank to the above-mentioned lower limit or higher, it is possible to more easily form a foamed sheet. In the method for manufacturing a fruit and vegetable storage container, by setting the temperature of the heater tank to the above-mentioned upper limit or lower, it is possible to suppress crystallization of the polyester-based resin.

[0129] In the method for manufacturing a fruit and vegetable storage container, by setting the surface temperature of the preheated polyethylene terephthalate-based resin foam sheet to the above-mentioned lower limit or higher, the polyethylene terephthalate-based resin foam sheet can be more easily molded.In the method for manufacturing a fruit and vegetable storage container, by setting the surface temperature of the preheated polyethylene terephthalate-based resin foam sheet to the above-mentioned upper limit or lower, crystallization of the polyethylene terephthalate-based resin on the surface of the polyethylene terephthalate-based resin foam sheet can be suppressed.

[0130] In the method for manufacturing a fruit and vegetable storage container, by setting the preheating time of the polyethylene terephthalate-based resin foam sheet in the preheating step to not less than the above-mentioned lower limit, the polyethylene terephthalate-based resin foam sheet can be more easily molded.In the method for manufacturing a fruit and vegetable storage container, by setting the preheating time of the polyethylene terephthalate-based resin foam sheet in the preheating step to not more than the above-mentioned upper limit, crystallization of the polyethylene terephthalate-based resin on the surface of the polyethylene terephthalate-based resin foam sheet can be suppressed.

[0131] In the method for manufacturing a fruit and vegetable storage container, a clearance is formed between the polyethylene terephthalate-based resin foam sheet and the male mold during the pressure molding, so that the polyethylene terephthalate-based resin foam sheet and the male mold are not in close contact with each other during heat molding, and therefore fine irregularities can be formed on the surface of the top side (the side facing the male mold of the mold) of the molded polyethylene terephthalate-based resin foam sheet. As a result, the fruit and vegetable storage container 1 manufactured by the method for manufacturing a fruit and vegetable storage container can prevent the fruit and vegetables from rotating and causing damage to the surfaces of the fruit and vegetables.

[0132] The present invention includes the following aspects.

[0133] [1] A fruit and vegetable storage container for storing fruit and vegetables, a storage member made of a foamed molded body containing a polyethylene terephthalate-based foamed resin; The storage member has a storage portion formed in a recessed shape for storing the fruits and vegetables, The surface of the storage section is formed with minute irregularities. Container for storing fresh produce. [2] The arithmetic mean height (Sa) of the surface of the housing portion is 6.0 μm or more and 30.0 μm or less. [1] A container for storing fresh produce. [3] The minimum autocorrelation length (Sal) of the surface of the storage portion is 300 μm or more and 800 μm or less. [1] or [2]. A container for storing fresh produce. [4] The device further includes a support container formed into a bottomed cylindrical shape and made of a foam molded body containing a polyethylene terephthalate-based foam resin, The storage member is a storage tray formed in a tray shape, The storage tray is supported and housed in a support container made of a foamed molded body containing a polyethylene terephthalate-based foamed resin, The storage tray has a supported portion 22 for being supported by the support container, The storage tray is supported by the support container, thereby forming a space between the storage section and the support container. A fruit and vegetable storage container according to any one of [1] to [3]. [5] The storage section has a storage bottom and a storage sidewall, The arithmetic mean height (Sa) of the surface of the storage bottom is 6.0 μm or more and 30.0 μm or less; [4] A container for storing fresh produce. [6] The storage section has a storage bottom and a storage sidewall, The minimum autocorrelation length (Sal) of the surface of the storage bottom is 300 μm or more and 800 μm or less. [4] or [5]. A container for storing fresh produce. [7] The storage section has a storage bottom and a storage sidewall, The thickness of the storage bottom is 0.15 mm or more and 1.00 mm or less, The thickness of the housing side wall portion is 0.20 mm or more and 1.10 mm or less. A container for storing fruits and vegetables according to any one of [4] to [6]. [8] The storage tray further has a support portion 23 that supports the storage portion on the supported portion 22. A container for storing fruits and vegetables according to any one of [4] to [7]. [9] The surface of the support portion 23 is formed with minute irregularities. [8] A container for storing fresh produce.

[10] The arithmetic mean height (Sa) of the surface of the support portion 23 is 3.0 μm or more and 20.0 μm or less. [9] A container for storing fresh produce.

[11] The minimum autocorrelation length (Sal) of the surface of the support portion 23 is 200 μm or more and 700 μm or less. [9] or

[10] . A container for storing fresh produce.

[12] The thickness of the support portion 23 is 0.50 mm or more and 2.00 mm or less. A container for storing fruits and vegetables according to any one of [8] to

[11] .

[13] The storage member is composed of a foam molded body made only of polyethylene terephthalate-based foam resin. [1] -

[12] A container for storing fruits and vegetables.

[14] The support container is composed of a foam molded body made only of polyethylene terephthalate-based foam resin. A container for storing fruits and vegetables according to any one of [4] to

[12] .

[0134] The fruit and vegetable storage container according to the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. In addition, the configurations, methods, etc. of the embodiments other than those described above may be arbitrarily adopted and combined.

[0135] The fruit and vegetable storage container 1 according to this embodiment is a container for storing strawberries, which are fruits and vegetables. However, the fruit and vegetable storage container 1 according to this invention is not limited to this, and may store other fruits and vegetables such as peaches, tomatoes, eggplants, etc.

[0136] The fruit and vegetable storage container 1 according to this embodiment is a storage tray 2 in which the storage member 2 is formed in a tray shape. However, the fruit and vegetable storage container 1 according to the present invention is not limited to this, and for example, the storage member 2 may be formed in a block shape. The storage member 2 formed in a block shape may be solid or hollow.

[0137] In the fruit and vegetable storage container 1 according to this embodiment, the storage member 2 has a storage portion 21, a supported portion 22, and a supporting portion 23. However, the fruit and vegetable storage container 1 according to the present invention is not limited to this, and for example, if the storage member 2 is formed in a block shape, the storage member 2 does not need to have the supported portion 22 and the supporting portion 23.

[0138] In the fruit and vegetable storage container 1 according to this embodiment, fine irregularities are formed on the surface of the support portion 23. However, the fruit and vegetable storage container 1 according to this invention is not limited to this, and the surface of the support portion 23 does not necessarily need to have fine irregularities formed thereon.

[0139] The fruit and vegetable storage container 1 according to this embodiment includes a storage member 2 and a support container 3. However, the fruit and vegetable storage container 1 according to this invention is not limited to this, and for example, if the storage member 2 is formed in a block shape, the support container 3 may not be included and the container may be composed of only the storage member 2.

[0140] In the fruit and vegetable storage container 1 according to this embodiment, the storage tray 2 has 11 storage sections 21. However, the fruit and vegetable storage container 1 according to the present invention is not limited to this, and the number of storage sections 21 in the storage member 2 may be 1 to 10, or 12 or more.

[0141] In the fruit and vegetable storage container 1 according to this embodiment, the shape of the storage section 21 in a front view, a side view, and a plan view is formed to correspond to the shape of a strawberry. However, the fruit and vegetable storage container 1 according to the present invention is not limited to this, and the shape of the storage section 21 in a front view, a side view, and a plan view may be formed to correspond to the shape of fruit and vegetable such as peaches, tomatoes, eggplants, etc.

[0142] In the fruit and vegetable storage container 1 according to this embodiment, the storage member 2 has a first mating portion 22, and the support container 3 has a second mating portion 33. However, the fruit and vegetable storage container 1 according to the present invention is not limited to this, and the storage member 2 may not have the first mating portion 22, and the support container 3 may not have the second mating portion 33. For example, the storage member 2 and the support container 3 may be fixed to each other by a fastening device such as a clip.

[0143] In the fruit and vegetable storage container 1 according to this embodiment, the first joint portion 22 is generally inverted U-shaped in a cross-sectional view when the storage tray 2 is viewed from the front. However, the fruit and vegetable storage container 1 according to the present invention is not limited to this, and the first joint portion 22 may be generally inverted V-shaped in a cross-sectional view when the storage tray 2 is viewed from the front.

[0144] In the fruit and vegetable storage container 1 according to this embodiment, the second joint portion 33 is generally inverted U-shaped in a cross-sectional view when the support container 3 is viewed from the front. However, the fruit and vegetable storage container 1 according to the present invention is not limited to this, and the second joint portion 33 may be generally inverted V-shaped in a cross-sectional view when the support container 3 is viewed from the front.

[0145] In the fruit and vegetable storage container 1 according to this embodiment, the storage tray 2 is formed in a substantially rectangular shape in a plan view. However, the fruit and vegetable storage container 1 according to this invention is not limited to this, and the storage tray 2 may be formed in a circular shape such as a perfect circle or an ellipse in a plan view, a substantially triangular shape, or a substantially polygonal shape such as a substantially pentagonal shape or a substantially hexagonal shape.

[0146] In the fruit and vegetable storage container 1 according to the present embodiment, the support container 3 is formed in a substantially rectangular shape in the front, side, top, and bottom views. However, the fruit and vegetable storage container 1 according to the present invention is not limited thereto, and the support container 3 may be formed in a circular shape such as a perfect circle or an ellipse, or in a substantially triangular shape, or in a substantially polygonal shape such as a substantially pentagonal shape or a substantially hexagonal shape in the front view. In the side view, the support container 3 may be formed in a circular shape such as a perfect circle or an ellipse, or in a substantially triangular shape, or in a substantially polygonal shape such as a substantially pentagonal shape or a substantially hexagonal shape in the top view. In the bottom view, the support container 3 may be formed in a circular shape such as a perfect circle or an ellipse, or in a substantially triangular shape, or in a substantially polygonal shape such as a substantially pentagonal shape or a substantially hexagonal shape. [Example]

[0147] The present invention will be explained in more detail below using examples and comparative examples, but the present invention is not limited to the following examples. Note that "parts" used as a unit of raw material composition below represents "parts by mass" unless otherwise specified.

[0148] Example 1 <Foam sheet manufacturing> The main raw materials were 100 parts by mass (hereinafter simply referred to as 100 parts) of PET resin with an IV value of 1.04, 0.5 parts of fine talc (manufactured by Nippon Talc Co., Ltd., SG-95) as a crystallization accelerator, 3 parts of PE-SM-SAE29906BLACK-C (manufactured by Dainichiseika Color & Chemicals Mfg. Co., Ltd., kneaded with 30% by mass of furnace carbon black (hereinafter also simply referred to as "CB") (0.9 parts of CB added), and 0.2 parts of pyromellitic anhydride (manufactured by Daicel Corporation, Daicel Pyromellitic Anhydride) as a crosslinking agent. These raw materials were pre-dried at 100°C for 4 hours, dehumidified, and then melt-kneaded in a 90mm diameter extruder. Nitrogen gas was injected at a predetermined position for kneading. The mixture was then extruded through a 135mm diameter circular die, cooled on a predetermined mandrel while being taken up at a take-up speed of 4.0 m / min, and formed into a sheet, which was then wound up. The resulting foamed sheet had a thickness of 0.75 mm and a basis weight of 350 g / m 2 It was.

[0149] <Manufacturing foam containers> A thermoplastic polyethylene terephthalate resin foam sheet was preheated for 90 seconds in a heater tank at 150°C to raise the surface temperature of the foam sheet to 125°C and to perform secondary foaming so that the expansion ratio became 1.3 to 1.5. After that, vacuum suction was applied from the female side and compressed air was supplied from the male side to bring the foam sheet into close contact with the female mold, and the male and female molds were closed for 6 seconds to perform vacuum pressure molding at 30°C to obtain a storage member consisting of a storage tray and a support container.

[0150] Example 2 A foamed sheet and a containing member were produced in the same manner as in Example 1, except that the take-up speed after extrusion from the circular die was 3.5 m / min. The resulting foamed sheet had a thickness of 0.85 mm and a basis weight of 400 g / m 2 And so it was.

[0151] Example 3 A foamed sheet and a containing member were produced in the same manner as in Example 1, except that the take-up speed after extrusion from the circular die was 2.3 m / min. The resulting foamed sheet had a thickness of 1.30 mm and a basis weight of 600 g / m2 And so it was.

[0152] (Comparative Example 1) A storage member was produced in the same manner as in Example 1, except that the foamed sheet of Example 1 was replaced with an A-PET film (non-foamed sheet) "KA-20" manufactured by Shin-ei Kasei Co., Ltd. having a thickness of 0.3 mm.

[0153] (Comparative Example 2) A foamed sheet and a containing member were produced in the same manner as in Example 3, except that in the molding process, vacuum suction was applied from the male side and compressed air was supplied from the female side to make the foamed sheet adhere to the male mold.

[0154] <Arithmetic mean height (Sa) and minimum autocorrelation length (Sal)> The arithmetic mean height (Sa) and minimum autocorrelation length (Sal) of the surfaces of the receiving tray and supporting container were measured according to the method specified in ISO25178 Surface Texture (Surface Roughness Measurement).

[0155] <Thickness> The thickness of the storage portion and the support portion of the storage tray was measured using a dial thickness gauge SM-112 (manufactured by Teclock).

[0156] [Evaluation of ball rotation through vibration testing] Eleven strawberries were placed in the resulting container, covered with film, and subjected to vibration in the X, Y, and Z directions for 5 minutes each using a random vibration tester in accordance with JIS Z0200 Level 3. Evaluation was based on the following criteria. Note that the "rotating ball" state below refers to a state in which the tip of the strawberry before the test has rotated by 90 degrees or more in the horizontal or vertical direction after the test. (Evaluation criteria) ◎: None of the strawberries have turned round compared to before the test. O: 1 to 3 strawberries have become rounder than before the test. ×: Four or more strawberries have rotated since before the test.

[0157] [Slipperiness of foam container surface] The support part of the obtained storage tray was grasped with the thumb and index finger, and the tray was evaluated according to the following criteria. (Evaluation criteria) ◎: The storage tray does not slip when gripped with relaxed force (only the shape of the fingertips is deformed). 〇: When gripped with light force (just enough to deform the shape of the fingertips and stretch the first joint of the thumb), the storage tray does not slip under the fingertips. ×: Unless you consciously grasp it (you can see the force at the base of your thumb and index finger), the storage tray will slip under your fingertips.

[0158] The evaluation results of each example and each comparative example are shown in Table 1.

[0159] [Table 1]

[0160] As can be seen from Table 1, each of the examples that satisfy the constituent requirements of the present invention obtained better results in the evaluation of ball rotation than each of the comparative examples.

[0161] Furthermore, according to Table 1, the storage members of Examples 1 and 2 have better results in terms of slipperiness than the other Examples and Comparative Examples, which means that the storage members are less likely to slip out of the hand when held, making them easier to handle.

[0162] From the above, it can be seen that the present invention can provide a fruit and vegetable storage container that can sufficiently prevent fruit and vegetable balls from turning over during transportation, thereby preventing damage to the surface of the fruit and vegetable. [Explanation of symbols]

[0163] 1: Fruit and vegetable storage container 2: Storage member (storage tray) 21: Storage unit 22: Supported part (first mating part) 23: Support part 3: Support container 31:Bottom of container 32: Container side wall 33: Part 2 of the Lihe section

Claims

1. A fruit and vegetable storage container for storing fruit and vegetables, a storage member made of a foamed molded body containing a polyethylene terephthalate-based foamed resin; The storage member has a storage portion formed in a recessed shape for storing the fruits and vegetables, The surface of the storage section is formed with minute irregularities. Container for storing fresh produce.

2. The arithmetic mean height (Sa) of the surface of the storage portion is 6.0 μm or more and 30.0 μm or less; The fruit and vegetable storage container according to claim 1.

3. The minimum autocorrelation length (Sal) of the surface of the storage portion is 300 μm or more and 800 μm or less. The fruit and vegetable storage container according to claim 1.

4. The storage member is a storage tray formed in a tray shape, The storage tray is supported and housed in a support container made of a foamed molded body containing a polyethylene terephthalate-based foamed resin, The storage tray has a supported portion for being supported by the support container, The storage tray is supported by the support container, thereby forming a space between the storage section and the support container. The fruit and vegetable storage container according to claim 1.

5. The storage section has a storage bottom and a storage sidewall, The arithmetic mean height (Sa) of the surface of the storage bottom is 6.0 μm or more and 30.0 μm or less; The fruit and vegetable storage container according to claim 4.

6. The storage section has a storage bottom and a storage sidewall, The minimum autocorrelation length (Sal) of the surface of the storage bottom is 300 μm or more and 800 μm or less; The fruit and vegetable storage container according to claim 4.

7. The storage section has a storage bottom and a storage sidewall, The thickness of the storage bottom is 0.15 mm or more and 1.00 mm or less, The thickness of the housing side wall portion is 0.20 mm or more and 1.10 mm or less. The fruit and vegetable storage container according to claim 4.

8. the storage tray has a support portion that supports the storage portion on the supported portion, The support portion is formed to be harder than the storage portion. The fruit and vegetable storage container according to claim 4.

9. The surface of the support portion is formed with minute irregularities. The fruit and vegetable storage container according to claim 8.

10. The arithmetic mean height (Sa) of the surface of the support portion is 3.0 μm or more and 20.0 μm or less. The fruit and vegetable storage container according to claim 9.

11. The minimum autocorrelation length (Sal) of the surface of the support portion is 200 μm or more and 700 μm or less. The fruit and vegetable storage container according to claim 9.

12. The thickness of the support portion is 0.50 mm or more and 2.00 mm or less. The fruit and vegetable storage container according to claim 8.

13. The storage member is composed of a foam molded body made only of polyethylene terephthalate-based foam resin. The fruit and vegetable storage container according to claim 1.

14. The support container is composed of a foam molded body made only of polyethylene terephthalate-based foam resin. The fruit and vegetable storage container according to claim 4.

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