JP4179520B2 - Fermented food container lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fermented food container lid for protecting the food contained in a fermented food container such as natto, miso, and koji, and a method for producing natto using the lid.
[0002]
[Prior art]
The manufactured fermented foods such as natto, miso, and koji are put in paper or plastic containers such as polyethylene and polystyrene, and the lid is put on the opening of the container from the viewpoint of food hygiene and shipped to the market. Yes. As for natto, natto immediately after production contains a lot of moisture, and it is necessary to release the moisture to the outside of the container. Air permeability and moisture permeability are required, and a porous plastic film having a large number of fine holes, particularly a polyethylene film, is usually used. Similarly, miso and koji are also required to have air permeability and moisture permeability in the container lid for aging fermentation.
However, the conventional porous plastic film is opaque and not only can not confirm the fermented state of the fermented food, but also has a low tear strength, so it may be torn due to slight scratches in the middle of transportation or at the store. There were many problems.
[0003]
[Problems to be solved by the invention]
The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art, and the object of the present invention is to provide appropriate air permeability and moisture permeability for maintaining the quality and taste of fermented food in the container. Another object of the present invention is to provide a lid for fermented food containers that has a transparent portion that can confirm the fermentation state of the fermented food from the outside and has a sufficient tear strength against external stress.
[0004]
[Means for Solving the Problems]
The lid for fermented food containers according to the present invention is configured as follows. That is, a fermented food container obtained by laminating a breathable and breathable film selected from the group consisting of a breathable and breathable plastic film , a multi-holed plastic film, a woven fabric, and a nonwoven fabric, and a transparent plastic film. It is a cover material, Comprising : Another transparent plastic film is laminated | stacked in the part in which the said ventilation moisture permeable film is not laminated | stacked on the said transparent plastic film, The moisture permeability of the said ventilation moisture permeable film is 300-1,300g. / M ² · 24 hr, the air permeability is 8,000 to 32,000 sec / 100 cc, the area of the breathable moisture permeable film laminated on the transparent plastic film is 30 to 70% of the lid material area, In addition, a large number of ventilation holes are provided in the transparent plastic film that is laminated on the ventilation and moisture-permeable film. And characterized in that it is kicked, also the adhesive has only been applied to a portion of the laminated surface of the transparent plastic film and the breathable moisture-permeable film, the tear strength of the lid member is 300 g / 15 mm width or more It is characterized by being.
[0005]
In addition, the method for producing natto according to the present invention includes a first step of steaming or boiling soybean, a second step of inoculating steamed or boiled soybean with natto bacteria, and putting the soybean in a natto container. The container is covered with the fermented food container lid, and then placed in a chamber to be fermented, and the third step.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a lid for fermented food containers according to the present invention, FIG. 2 is a perspective view showing another example of the lid for fermented food containers according to the present invention, and FIG. 4 is a cross-sectional enlarged view taken along line AA in FIG. 1 or FIG. 2, FIG. 5 is a cross-sectional enlarged view taken along line BB in FIG. 3, and FIG. 6 is a fermented food container lid material of the present invention. It is a cross-sectional enlarged view which shows the other example of this. In the figure, reference numeral 1 is a fermented food container lid, 2 is a transparent plastic film, 2a is a through-hole, 3 is a breathable moisture-permeable film, 4 is a transparent polyolefin film, 4a is a through-hole, 5 is an adhesive, and 6 is a container. , 6a indicates the buttocks.
[0007]
As shown in FIGS. 1 to 3, the fermented food container lid 1 according to the present invention has a transparent polyolefin film 4 that can be heat-sealed to the flange portion 6 a of the container 6, and a breathable and moisture-permeable film 3. 6 to FIG. 6 is a lid formed by laminating two or three layers using an adhesive 5, and a portion of the transparent polyolefin film 4 to which the breathable moisture permeable film 3 is bonded is provided with a breathable permeability. A number of through holes 4a are provided in order to maintain the wettability. In addition, the shape of many through-holes 4a should just maintain ventilation | gas_breathing permeability, and holes, such as a round hole, a square shape, and an H type, are used. The strength of the fermented food container lid 1 varies depending on the thickness of each film used. However, when the strength is insufficient using a thin film, it is transparent in the transparent polyolefin film 4 as shown in FIG. The strength can be adjusted by laminating the plastic film 2 using the adhesive 5 or by forming a three-layer structure as shown in FIG.
[0008]
(1) Lid for Fermented Food Container The lid for fermented food container according to the present invention is a breathable and breathable material selected from the group consisting of a breathable and breathable plastic film, a multi-porous plastic film, paper, woven fabric and non-woven fabric. A lid for a fermented food container formed by laminating a film and a transparent plastic film using an adhesive, and the moisture permeability of the breathable moisture permeable film (according to JIS Z 0208) is 300 to 1,300 g / m ^2. -24 hr, air permeability (according to JIS P8117) is 8,000-32,000 sec / 100 cc, the area of the breathable breathable film laminated to the transparent plastic film is 30-70% of the lid material area, In addition, the transparent plastic film of the portion laminated to the breathable moisture permeable film is provided with a large number of ventilation holes, and Another transparent plastic film is laminated on a portion where the breathable moisture permeable film is not laminated on the transparent plastic film, and the adhesive is a laminated surface of the breathable moisture permeable film and the transparent plastic film. The lid material for fermented food containers, wherein the lid material has a tear strength (by a light load tear tester) of 300 g / 15 mm width or more. It is a laminate having a three-layer structure.
[0009]
By giving such specific air permeability and moisture permeability, the temperature and humidity inside the container can be kept constant, and foreign matter from the outside of the container and entry of micro insects can be prevented, and the transparent portion can be By providing, the fermented state of fermented food can be confirmed.
[0010]
As a breathable and moisture permeable film, after film formation using polyolefin such as polyethylene and polypropylene, polyvinyl chloride, polystyrene, polyethylene terephthalate (PET), acrylic resin, polyvinylidene fluoride, polyamide such as nylon, etc. as a base material Examples thereof include those made porous by stretching or mechanical perforation.
[0011]
Since such a laminate has an adhesive or a void in the middle portion, compared to the case of using a single-layer breathable and moisture-permeable planar member, it has a higher resistance to external stress, and therefore has a tear strength of 300 g / An excellent lid material having a width of 15 mm or more can be obtained.
[0012]
Moreover, it is better to apply | coat an adhesive only to a part of lamination surface, and to form a space | gap in the middle of a laminated body. This is because the air outside the fermented food container does not flow directly into the container from the lid, but flows into the container via the gap, so the temperature and humidity in the container are not directly affected by the outside air. This is because it is possible to ensure heat retention and moisture retention in a substantially constant container.
Hereinafter, preferred embodiments will be described.
[0013]
(1) Porous polyolefin film The porous polyolefin film is based on polyolefins such as polyethylene, polypropylene, polybutene, ethylene-propylene copolymer, ethylene vinyl acetate copolymer, among which water vapor and oxygen A low density polyethylene excellent in gas permeability, particularly a linear low density polyethylene excellent in physical strength such as tear strength is preferred.
[0014]
Such polyolefin is blended with a fine powder of a material that is poorly compatible with the polyolefin, for example, an inorganic filler such as talc, mica, silica, clay, or a thermoplastic resin (for example, polystyrene) that is less compatible with the polyolefin. The resulting film is stretched at a temperature lower than the melting temperature of the polyolefin to obtain a porous film.
[0015]
Or it can be made porous by mixing an organic solvent with molten polyolefin and foaming it, or by mixing polyethylene glycol (PEG) etc. with polyolefin to form a film and then eluting PEG to form pores. A film can also be obtained. Furthermore, a method may be used in which a polyolefin film is perforated using a hot needle, an electron beam, or laser light, and then the film is thermally contracted to obtain a porous film having a predetermined pore diameter.
[0016]
The moisture permeability (based on JIS Z 0208) of the porous film for setting the air permeability and moisture permeability of the cover material to a specific range is preferably 500 to 2,000 g / m ² · 24 hr, particularly 800 to 1500 g / m ² ·. 24 hours is preferable.
Further, the air permeability (based on JIS P 8117) is preferably 3,000 to 10,000 sec / 100 cc, particularly preferably 5,000 to 7,000 sec / 100 cc.
In order to obtain such air permeability and moisture permeability, it is necessary that at least some of the many holes provided in the film communicate with the front and back.
[0017]
(2) Breathable and breathable polyamide-based non-woven fabric Polyamide fibers are made of fabric by bonding or fusing with an adhesive or by mechanical methods. Among them, spunbond can be obtained with high strength and flexibility. Nonwoven fabrics produced by the method are preferred.
[0018]
The nonwoven fabric has an air permeability (based on JIS P 8117) of 0.5 to 10 sec / 100 cc, particularly 1 to 5 sec / 100 cc, in order to make the air permeability of the cover material within a specific range. The moisture permeability (based on JIS Z 0208) is preferably 500 to 2,000 g / m ² · 24 hr, and particularly preferably 800 to 1,500 g / m ² · 24 hr.
[0019]
(3) Lid material The preferred lid material is a laminate obtained by laminating a transparent polyolefin film on the porous polyolefin film or the breathable and breathable polyamide nonwoven fabric with an adhesive.
In order to keep the temperature and humidity inside the fermented food container constant and prevent foreign matter from entering from outside the container, the moisture permeability (according to JIS Z 0208) of the laminated body (lid) is 300 to 1,300 g. / M ² · 24 hr, preferably 400 to 800 g / m ² · 24 hr, while the air permeability (according to JIS P 8117) is 8,000 to 32,000 sec / 100 cc, preferably 10,000 to 20,000 sec / 100cc.
[0020]
Further, the tear strength (by a light load tear tester) of the laminate (cover material) is 300 g / 15 mm width or more, preferably 500 g / 15 mm width or more. As an adhesive at the time of lamination, an adhesive for resin capable of bonding both polyamide and polyolefin, for example, a chloroprene-based, epoxy-based, or nitrile rubber-based adhesive is used, and among them, a chloroprene-based adhesive is preferable.
[0021]
As shown in FIGS. 4 to 6, the bonding method does not block a large number of holes provided in a transparent polyolefin film bonded to the breathable moisture permeable film as shown in FIGS. Therefore, it is not necessary to provide an adhesive around all the through holes, and it is desirable to apply them at a predetermined interval.
[0022]
(2) Manufacturing method of natto In the manufacturing method of natto of the present invention, the first step of steaming or boiling soybeans, the second step of inoculating steamed or boiled soybeans with natto bacteria, and the soybeans in a container Then, after covering the said container with the said cover material for fermented food containers, it consists of a 3rd process fermented by putting into a chamber.
[0023]
In the first step, the dried soybeans are soaked in water for 8 to 15 hours to fully contain water, boiled for about 1 to 2 hours, drained, or steamed and cooled for about 1 to 2 hours.
In the second step, the soybeans obtained in the first step are inoculated with natto bacteria.
[0024]
In the third step, soybeans inoculated with Bacillus natto are placed in a container, and the opening of the container is covered with a cover made of a laminate of a breathable moisture permeable film having a specific moisture permeability and air permeability described above and a transparent polyolefin film. Cover. At this time, the transparent polyolefin film of the lid is sealed by heat sealing at the container opening. Then, the natto is fermented for 5 to 50 hours at a temperature of 35 to 52 ° C. and a humidity of 60 to 95% RH. The air-permeable and moisture-permeable film of the lid is 30-70% of the area of the lid, so that air and moisture can permeate appropriately, and the inside of the container is moderately warmed and moisturized, so natto fermentation is promoted smoothly. The degree of fermentation can be confirmed through a transparent plastic film or a transparent polyolefin film.
[0025]
【The invention's effect】
(1) The lid material of the present invention is a laminate comprising an air-permeable and moisture-permeable film and a transparent plastic film using an adhesive, and air and moisture are appropriately permeated through the air-permeable and moisture-permeable film. Since it is kept warm and moisturized properly, fermentation of fermented foods such as natto and miso is promoted smoothly, and the fermentation state can be confirmed from the outside through a transparent plastic film.
(2) When the tear strength of the lid material is weaker than the predetermined strength, the strength of the lid material can be reinforced without further impairing the breathable moisture permeability by further laminating the transparent plastic film on the transparent plastic film.
(3) Moreover, in the lid | cover material of this invention, when an adhesive agent is apply | coated only to a part of the lamination surface, a space | gap exists in the intermediate part of a laminated body, and the air outside a fermented food container is directly from a lid | cover. It does not flow into the container, but flows into the container via a gap. Therefore, the temperature and humidity in the container are not directly influenced by the outside air, and a substantially constant heat retaining property and moisture retaining property in the container can be secured, contributing to the smooth fermentation of natto.
(4) According to the method for producing natto of the present invention, since a lid having specific moisture permeability and air permeability is used, it is possible to ensure heat retention and moisture retention in a substantially constant container. It can be smoothly fermented, and at the same time it can be put in a chamber covered with a lid in a fermentation process that takes a long time, and it is extremely hygienic and does not contain foreign matter such as dust or micro insects. The fermentation state can be confirmed through a transparent plastic film.
[Brief description of the drawings]
FIG. 1 is a perspective view of a lid for a fermented food container according to the present invention.
FIG. 2 is a perspective view showing another example of the fermented food container lid of the present invention.
FIG. 3 is a perspective view showing another example of the lid for fermented food containers according to the present invention.
4 is an enlarged sectional view taken along line AA of FIG. 1 or FIG.
5 is an enlarged cross-sectional view taken along line BB in FIG. 3;
FIG. 6 is an enlarged sectional view showing another example of the fermented food container lid of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cover material for fermented food containers 2 Transparent plastic film 2a Through-hole 3 Breathable moisture-permeable film 4 Transparent polyolefin film 4a Through-hole 5 Adhesive 6 Container 6a Buttocks

Claims (2)

A lid for fermented food containers, which is formed by laminating a breathable and breathable film selected from the group consisting of a breathable and breathable plastic film , a multi-holed plastic film, a woven fabric and a nonwoven fabric, and a transparent plastic film. Material,
Other transparent plastic film is laminated on the portion where the breathable moisture permeable film is not laminated on the transparent plastic film,
The breathable moisture permeable film has a moisture permeability of 300 to 1,300 g / m ² · 24 hr, an air permeability of 8,000 to 32,000 sec / 100 cc, and an area of the breathable moisture permeable film laminated on the transparent plastic film. Is 30 to 70% of the lid material area, and the transparent plastic film of the portion laminated to the breathable moisture permeable film is provided with a large number of vent holes for ventilation. Container lid. 2. The adhesive according to claim 1, wherein the adhesive is applied only to a part of the laminated surface of the breathable moisture permeable film and the transparent plastic film, and the tear strength of the lid member is 300 g / 15 mm width or more. The cover for fermented food containers as described.

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