JPH06205656A - Container - Google Patents

Abstract

PURPOSE:To provide a container suitable for using in food industry field and fields of culture of aerobic bacteria and culture of animals and plants requiring both of air permeability and aseptic properties. CONSTITUTION:In a container composed of a container body 20 made of a resin material having bottom and whose upper part is opened and a lid 10 consisting of a resin sheet capable of covering the opening, a number of not penetrated fine holes 11 are formed in a part corresponding to at least opening of the lid 10. By forming nor penetrated fine holes in the lid material, a container having aseptic properties and air permeability can be provided without using an aseptic filter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container, and is used in the field of food industry, in particular, for packaging foods that remarkably breathe during storage and suffocate if sealed, or foods that generate a lot of gas and are difficult to seal. And a container suitable for use as a culture container thereof in the fields of aerobic bacteria culture and animal / plant culture, which is required to have sterility while having air permeability.

[0002]

2. Description of the Related Art Conventionally, in the field of packaging of fermented foods or fresh foods, when completely sealed, the respiration of the food itself is remarkable, so that the suffocation of the food and the large generation of gas due to the extreme decrease in the enzyme concentration. There is a problem such as swelling of the container in the case of, and the bag breaking of the container in extreme cases, and in order to deal with these problems, in many cases a hole for breathing and venting is prepared in advance in the container. It has been set.

In the fields of aerobic culture and animal and plant culture, glass test tubes, Erlenmeyer flasks, and petri dishes have been generally used, and they are heavy and may be damaged during transportation. However, there are problems that cleaning is difficult, and that the container is expensive and the container cost is large.

[0004]

In the conventional packaging field for fermented foods or fresh foods, the purpose of hermetically sealing the container is to prevent the food as the content from being inadvertently touched directly. In order to prevent contamination by bacteria contained in the atmosphere, in order to solve the problems such as swelling or bag breakage, the method of previously providing a gas vent hole, etc. Since it has a risk of being mixed, it is not always a solution that satisfies all of them. Further, as another means for solving the above problems, a gas permeable sterile filter is also attached to the container, but it has problems such as a complicated container manufacturing process and poor container design. ing.

In the fields of aerobic bacteria culture and animal and plant culture, a relatively inexpensive and easy-to-handle plastic container may be used in place of the glass container. Many of them have a structure in which they are combined with the container body by fitting, precision is required for processing, and processing methods are limited. Furthermore, since these aerobic bacteria and animals and plants perform respiration and photosynthesis and it is necessary to sufficiently permeate gas, it is common to use a filter having air permeability while maintaining sterility in the container. However, the manufacturing process is complicated and expensive. In addition, these containers are generally sterilized by autoclave sterilization, a resin having heat resistance,
For example, it has been limited to the use of expensive resins such as polycarbonate.

The present invention is intended to solve the above-mentioned disadvantages of conventional containers, and more specifically, it can be widely used for foods, cultures, etc. by simple means without using a sterile filter. The purpose is to obtain a sterile breathable container that can be applied to various purposes.

[0007]

In order to solve the above problems, according to the present invention, there is provided a bottomed container body made of a resin material having an upper opening, and a lid made of a resin sheet capable of covering at least the opening. Disclosed is a container which is characterized in that a large number of unpenetrated fine holes are formed in at least a portion of the lid corresponding to the opening.

The shape of the container body is not particularly limited, and the depth and height can be freely selected according to the size of the contents such as food. The resin that constitutes the container is not particularly limited by the present invention, and any resin that is normally used can be used. Further, as a method of molding the container, it is possible to perform processing by a conventional method such as a sheet molding method, a blow molding method, an injection molding method.

As the material of the lid used for the container body,
Although not limited, a resin having a low gas barrier property can be used more effectively. Then, a large number of unpenetrated fine holes are provided in at least a portion of the lid body corresponding to the opening. As a method of forming non-penetrating fine holes, for example, as shown in JP-A-4-2499, it has a pair of pressure rollers, to form fine irregularities on the surface of one pressure roller, these A method of making a hole by passing a resin film between a pair of pinching rollers is effective, but not limited to this.

At this time, the depth, number, area, and
It was experimentally confirmed that by appropriately selecting the film to be perforated, bacteria and the like can be imparted to the sheet but the required gas permeability can be imparted to the sheet. The gas permeability can be controlled by changing those values or materials as needed, and an appropriate one can be experimentally selected. In addition, the unpenetrated fine holes are
It may be formed on one side or both sides of the sheet-like body that forms the lid on condition that it does not penetrate the sheet state.

According to the experiments conducted by the present inventors, it was confirmed that an unperforated hole can be formed by using a stretched film of polypropylene of 50 μm and the oxygen permeation amount of 5000 to 50000 cc / m ² · 24 hr · atm can be controlled. . Of course, if a film having a higher gas permeability is used, a higher gas permeability can be obtained. The container and the lid can be bonded to each other by a method such as heat sealing, an adhesive, or an adhesive, but in any case, it is essential that the container main body and the lid are tightly sealed. Heat sealing is the most general method in food applications, but the application of opening and sealing a plurality of times, that is, plants, in the culture of aerobic bacteria, by imparting adhesiveness to the lid material, This is possible.

An example of the container and the lid is shown in FIG. Figure 1a
Shows a state in which the lid 10 and the container body 20 are integrally joined, and FIG. 1b schematically shows a cross section of the lid 10, and FIG. 1c similarly shows the container body 20. It is a schematic drawing of a cross section. Lid 10 in this example
A large number of unpenetrated fine holes 11 are formed on the entire surface of the sheet by passing a resin film between a pair of pressure rollers having fine irregularities formed on the surface of one pressure roller. Further, a bulge 12 is formed on a part of the lid 10, and this is formed as needed to facilitate opening of the lid 10. The shape of the lid 10 may be any size that can cover at least the opening 21 of the container body 20 described later.

Further, the container body 20 has a flange portion 22 at the opening 21. In the flange portion 21, a double-sided tape 30 having adhesive layers 32 and 33 on both sides of an adhesive base material 31 is formed. One of the adhesive layers 32, to which the release paper 34 is adhered, is adhesively fixed. When using the container body 20 and the lid 10. After carrying out an appropriate sterilization operation as necessary, the contents are filled, the release paper 34 is then separated, and the lid 10 is adhered to the adhesive layer 32.

In the field of culturing plants and aerobic bacteria, higher transparency and higher sterility are required, and since autoclave sterilization is usually performed, polycarbonate and polypropylene are used from the viewpoint of heat resistance. The lid material and the container body may be manufactured from a heat-resistant plastic such as, but if it is sterilized in advance by another sterilization method, for example, ethylene oxide gas sterilization, gamma ray sterilization, etc., a usable resin material In addition to reducing the material cost, the molding process becomes easier.

[0015]

[Operation] According to the constitution of the present invention, by forming fine holes which are not penetrated into the sheet member which constitutes the lid, sterilization is not impaired and high gas permeation is achieved without using a filter for sterilization. It is possible to impart the property to the container.

[0016]

[Example 1]

-Kimchi container A laminated sheet of 0.4 mm thick unstretched polystyrene sheet (PS sheet) and 0.2 mm polyethylene sheet is used as the container body, and this is placed in the opening by a conventional vacuum / pressure forming method. 100 mm square with a bottom angle of 95 mm
A rectangular container having a corner and a depth of 30 mm was molded. The corners each have a radius R, and the flange of the container has a total width of 4 mm.
As the cover material, a PS sheet having a thickness of 40 μ was used, and a non-penetrating hole having an average depth of 90% was formed into a non-penetrating hole with a sandwiching roll to give an oxygen permeability of 5000
It was perforated so that it would be 0 cc / m ² · 24 hr · atm. 200 g of kimchi that had not been subjected to heat sterilization was filled in the container body, and 10 lids were attached by heat sealing to prepare 10 pieces.

Storage was carried out at 10 ° C. for 1 week.
No expansion of the container due to fermentation was observed, and it was judged that the container can be used in a chilled kimchi container. [Comparative Example] The same container body as that of the example was used, and a PS sheet 40 μ which had not been subjected to a non-through hole treatment was used as a lid. 200 g of kimchi that had not been heat-sterilized was filled into the container body, and 10 lids were attached by heat sealing to prepare 10 pieces.

When the container was stored at 10 ° C. for 1 week, expansion of the container due to fermentation was confirmed by 6 out of 10 pieces, impairing the commercial value. [Example 2] -Vegetable culture vessel As a vessel body, an unstretched polyester sheet having a thickness of 1.2 mm was used.
A rectangular container having an opening inner dimension of 120 mm square, a bottom angle of 95 mm square and a depth of 110 mm was molded. The corners take R respectively,
The flange of the container was flat with a total width of 8 mm.

A double-sided tape having a 7 μm-thick polyester film as a base material and coated with an acrylic adhesive on both sides was prepared, and release paper was attached to both sides, and punched into the flange shape of the container body described above. The release paper was peeled off on one side and brought into close contact with the flange. As the container lid material, poly (4-methylpentene) (trade name: TPX: manufactured by Mitsui Petrochemical) 50 μ was used, and an oxygen penetration rate of 100% cc / m ² · 24 hr · atm was obtained through a non-penetrating hole having an average depth of 60% by a pinching roll. After punching as described above, punching processing was performed in a shape capable of sufficiently covering the flange portion of the container body.

The container body and the lid member were each subjected to ethylene oxide gas sterilization. After autoclave sterilizing the plant culture medium used in the usual method, pour 50 ml into the container body under aseptic conditions, remove the release paper on the container flange, and seal the unpenetrated fine hole perforated surface with the outer surface. went.
Ten containers having the above-mentioned constitution were left in a non-sterilized environment at 23 ° C. for one month, but no contamination of the medium due to the contamination of bacteria was confirmed.

With respect to the 10 containers, the carnation seedlings already being cultivated were sterilized by a conventional method, and a part of the container lid was peeled off and transplanted and resealed. 23
Culturing was carried out for 1 month under the conditions of a cycle of 16 hours in the dark at 8 ° C. and an illuminance of 3000 lux for 8 hours, but no contamination with fungi was confirmed, and no variation in seedling morphology was observed.

[0022]

EFFECTS OF THE INVENTION According to the present invention, it is possible to process a container that is aseptic and breathable by a simple means of boring fine holes not penetrated through the lid material without using a sterile filter. Therefore, it can be widely applied to food and culture.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a container according to the present invention.

[Explanation of symbols]

 10 ... Lid, 11 ... Unpenetrated hole, 20 ... Container body,

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Claims (2)

[Claims] 1. A container comprising a bottomed container main body made of a resin material having an upper opening, and a lid made of a resin sheet capable of covering at least the opening, which corresponds to at least the opening of the lid. A container characterized in that a large number of unpenetrated fine holes are formed in a portion thereof. 2. The non-penetrating fine holes are formed on one surface of the sheet, and the depth of the holes is 30 to 30 mm of the thickness of the sheet.
Container according to claim 1, characterized in that it has reached up to 90%.