JP3978479B2 - 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, since the conventionally used plastic film has a low tear strength, it is often a problem that the film is torn due to slight scratches in the middle of conveyance or at the store.
[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. The object of the present invention is to provide a fermented food container lid that has a sufficient tear strength against external stress.
[0004]
That is, (Claim 1) of the present invention is “a cover for a fermented food container in which a breathable / breathable polyamide-based nonwoven fabric is laminated on a breathable / breathable porous polyolefin-based film using an adhesive, wherein the adhesive, the porous polyolefin film with voids occur in the laminated surface of the polyamide nonwoven fabric, and only be applied from the void to a portion of the laminate surface to air flows, the moisture permeability 300 to 1,300 g / m ² · 24 hr, air permeability of 8,000 to 32,000 sec / 100 cc, and tear strength of 300 g / 15 mm width or more ” It is .
[0005]
Further, the present invention (Claim 2), "the porous polyolefin film, Ri linear low density polyethylene film Der further the total area of the adhesive has been applied for use in the present invention, the porous a fermented food container lid "is 5-20% of the area of the lamination surface between the polyolefin film and the polyamide-based nonwoven fabric.
[0007]
The process of manufacturing natto using a container coated with the lid for fermented food containers of the present invention will be described.
First step of steaming or boiling soybeans, second step of inoculating steamed or boiled soybeans with natto bacteria, and after placing the soybeans in a natto container, the container is covered with the following lid for fermented food containers Natto can be manufactured by the 3rd process which puts it in a room | chamber after it covers and ferments.
Fermented food container lid: Fermented food container lid made by laminating a porous polyolefin film with a breathable and breathable polyamide non-woven fabric using an adhesive, wherein the adhesive is the porous polyethylene film Is applied only to a part of the laminated surface of the polyamide nonwoven fabric, the moisture permeability is 300 to 1,300 g / m 2 · 24 hr, the air permeability is 8,000 to 32,000 sec / 100 cc, and the tear strength is 300 g / 15 mm. it is on the width or more.
[0008]
The lid according to the present invention is a lid for a fermented food container in which a breathable and breathable polyamide-based nonwoven fabric is laminated on a breathable and breathable porous polyolefin film using an adhesive, and the adhesive is the above-mentioned It is applied only to a part of the laminated surface of the porous polyolefin film and the polyamide-based nonwoven fabric, the moisture permeability is 300 to 1,300 g / m 2 · 24 hr, the air permeability is 8,000 to 32,000 sec / 100 cc, and A lid for a fermented food container characterized by a tear strength of 300 g / 15 mm width or more, and a laminate having a two-layer structure (a three-layer structure when an adhesive layer is inserted).
[0009]
By giving such specific air permeability and moisture permeability, it is possible to keep the temperature and humidity inside the container constant and to prevent foreign matters from being mixed from the outside of the container.
[0010]
That is, as an aspect of this laminate, in the case of a combination of the same kind of members, such as breathable / breathable plastic films, breathable / breathable paper, breathable / breathable woven fabric, breathable / breathable nonwoven fabric, There may be a combination of different members such as a laminate of a breathable and breathable plastic film and a breathable and breathable nonwoven fabric, a laminate of a breathable and breathable plastic film and a breathable and breathable paper. Here, the breathable moisture permeability means that air and moisture (water vapor) can permeate, and the planar member is a film or sheet having a thickness smaller than the length and width. A shaped member.
[0011]
In addition, breathable and breathable plastic films are made from polyolefins such as polyethylene and polypropylene, polyvinyl chloride, polystyrene, polyethylene terephthalate (PET), acrylic resins, polyvinylidene fluoride, polyamides such as nylon, etc. Examples thereof include those that have been made porous by stretching or mechanical perforation after molding.
[0012]
Such a laminate is stuck using a commonly used adhesive, but the adhesive is applied only to a part of the laminated surface, the moisture permeability is 300 to 1,300 g / m ² · 24 hr, and the air permeability is 8 2,000 to 32,000 sec / 100 cc and a mode in which the air permeability and moisture permeability are ensured by coating the entire surface of the laminated surface and providing holes of 50 to 1000 μm are conceivable.
[0013]
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.
[0014]
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.
[0015]
Among the embodiments of the above laminate, a laminate obtained by laminating a breathable and breathable polyamide nonwoven fabric with an adhesive on a porous polyolefin film having breathable and breathable properties is preferable.
Hereinafter, a preferred embodiment (the invention according to claim 2) will be described.
[0016]
(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.
[0017]
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.
[0018]
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.
[0019]
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.
[0020]
(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.
[0021]
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.
[0022]
(3) Lid material The preferred cover material is a laminate obtained by laminating the air-permeable and moisture-permeable polyamide nonwoven fabric on the porous polyolefin film using 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.
[0023]
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.
[0024]
The bonding method is preferably applied to a part of the laminated surface of the porous polyolefin film and the non-woven fabric as shown in FIG.
[0025]
FIG. 1A is a perspective view showing a case where the adhesive 3 is applied in the form of dots at almost equal intervals on the laminated surface of the porous polyolefin film 1 of the lid 6, and about half of the nonwoven fabric 2 is formed from the film 1. The peeled state is shown. FIG. 3A is a perspective view showing the case where the adhesive is applied in a lattice pattern on the laminated surface, and shows a state in which the nonwoven fabric 2 is peeled from the film 1 by about half.
1 (b) and 3 (b) are plan views of the lid member 6 shown in FIGS. 1 (a) and 3 (a).
[0026]
As long as the adhesive is applied to a part of the laminated surface in this way, the application method is not limited, but the total area of the portion where the adhesive 3 is applied is the area of the entire laminated surface of the film 1 (this is a nonwoven fabric). 2 to 20% of the entire laminated surface of 2).
[0027]
FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. Since the adhesive 3 is applied to a part of the laminated surface, there is a gap 4 between the porous polyolefin film 1 and the nonwoven fabric 2, and the air outside the fermented food container flows directly into the container from the lid. It flows into the container via the gap 4 without any problems. Therefore, the temperature and humidity in the container are not directly affected by the outside air, and the heat retaining property and moisture retaining property in the container can be secured almost constant.
[0028]
(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 (porous polyolefin-type film / ventilation moisture permeability polyamide-type nonwoven fabric laminated body), it consists of a 3rd process made to ferment in a chamber.
[0029]
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.
[0030]
In the third step, soybeans inoculated with Bacillus natto are placed in a container, and the opening of the container is covered with the lid material having the specific moisture permeability and air permeability described above. At this time, the cover is sealed by heat-sealing the opening of the container so that the porous polyolefin film surface of the lid becomes the back surface. 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. Air and moisture are appropriately permeated between the fibers of the non-woven fabric of the lid material and the pores of the porous polyolefin film, and the inside of the container is appropriately kept warm and moisturized, so that the fermentation of natto is promoted smoothly.
[0031]
【Example】
(1) Production of lid material A linear low density polyethylene film having a permeability of 6,000 sec / 100 cc, a moisture permeability of 1,200 g / m ² · 24 hr, and a thickness of 50 μm, and a permeability of 2 sec / 100 cc, basis weight Was laminated using a polyamide-based non-woven fabric having a weight of 40 g / m ² and a chloroprene-based adhesive to produce a lid.
The obtained lid member had a moisture permeability of 540 g / m ² · 24 hr, an air permeability of 16,000 sec / 100 cc, and a tear strength of 800 g / 15 mm width.
Application of the adhesive was performed in the form of dots shown in FIG. The total area of the places where the adhesive was applied was about 10% of the area of the entire laminated surface of the polyethylene film.
[0032]
(2) Manufacture of natto 30 g of dried soybeans were immersed in water for 12 hours to sufficiently contain water, boiled for about 1 hour and drained.
Next, the soybeans obtained were inoculated with natto bacteria.
[0033]
Soybean inoculated with natto bacteria was placed in a polystyrene natto container, and the opening of the container was covered with the lid material obtained in the production of the lid material. At this time, the container was sealed by heat sealing at 170 ° C. so that the porous polyolefin film surface of the lid became the back surface.
Next, natto was fermented for 12 hours at a temperature of 48 ° C. in a room. As a result, Bacillus natto grew and fermented well.
[0034]
【The invention's effect】
(1) The lid material of the present invention is a laminated body composed of a breathable planar member, which allows air and moisture to permeate appropriately, and keeps the inside of the container moderately warm and moisturized, so it can be used for fermentation of natto and miso The fermentation of food is promoted smoothly.
[0035]
(2) 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.
[0036]
(3) In particular, when the lid material of the present invention is a laminate of a porous polyolefin film and a nonwoven fabric, air and moisture appropriately permeate between the fibers of the nonwoven fabric and the pores of the film, Is moderately warmed and moisturized, so that fermentation is promoted smoothly. At the same time, the lid surface is made of a tough polyamide-based non-woven fabric. It can prevent tearing due to stress.
[0037]
(4) According to the method for producing natto of the present invention, since the lid material having a 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 the room covered with a lid in a fermentation process that requires a long time, and it can be manufactured in a very hygienic manner with no risk of foreign matter such as dust and straw. be able to.
[Brief description of the drawings]
FIG. 1 shows a lid material of the present invention, FIG. 1 (a) is a perspective view showing a case where an adhesive is applied in a dot shape on a laminated surface of a film of the lid material, and FIG. 1 (b) is a lid material. FIG.
FIG. 2 is an enlarged sectional view taken along line XX in FIG.
3A and 3B show a lid material of the present invention, in which FIG. 3A is a perspective view showing a case where an adhesive is applied in a lattice pattern on a laminated surface of a film of the lid material, and FIG. 3B is a lid material. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Porous polyolefin-type film 2 Polyamide-type nonwoven fabric 3 Adhesive 4 Cavity 5 Container 6 Cover material

Claims (3)

A fermented food container lid that the porous polyolefin film of the vent moisture permeability breathable moisture permeability polyamide nonwoven fabric are laminated using an adhesive, wherein the adhesive, the said porous polyolefin film An air gap is formed on the laminated surface with the polyamide-based nonwoven fabric, and the air permeability is 300 to 1,300 g / m ² · 24 hr, air permeability is applied to only a part of the laminated surface so that air flows from the air gap. Is 8,000 to 32,000 sec / 100 cc, and the tear strength is 300 g / 15 mm width or more. The said porous polyolefin-type film is a linear low density polyethylene film, The lid | cover material for fermented food containers of Claim 1 characterized by the above-mentioned. The total area to which the adhesive is applied is, of claim 1 to claim 2, wherein the 5 to 20% of the area of the stacking surface of the porous polyolefin film and the polyamide-based nonwoven fabric Any one fermented food container lid.

Images