JP2002275742A - Fabric for food filtration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fabric for food filtration which has substantially no admixture of fluff in foods in a press filtration process in the production of various kinds of foods such as soy sauce, sake, wine, vinegar, tofu, etc., especially in a filtration process for example, unrefined soy sauce, exhibits the same filtration performance as those of soy sauce filtered by diatomaceous earth, does not cause dust and is friendly to the environment and to provide a method for producing the same. SOLUTION: This fabric for food filtration comprises a woven fabric constituted of synthetic fiber multifilament composite yarn made up of raw silk composed of extra fine filament having >=0.011 dTex and <=1.1 dTex single filament fineness and a crimped yarn composed of extra fine filament having >=0.011 dTex and <=1.1 dTex single filament fineness and crimps in which a part or the whole of the filaments on the surface or inside are mutually interlaced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cloth excellent in filtration performance in a food filtration step, and more particularly, to soy sauce,
The present invention relates to a fabric for filtering food which is suitable as a filter cloth used in a process of producing and filtering food such as sake, wine, vinegar or tofu, in particular, a process of filtering "moromi" of soy sauce, and a method for producing the same.

[0002]

2. Description of the Related Art In the mash filtration of soy sauce, for example, in the case of soy sauce mash filtration, a woven fabric made of nylon yarn having a single fiber fineness of about 3.3 dTex is used. Have been. The filtration performance is insufficient with the nylon fabric alone. When diatomaceous earth is used in combination, the filtration performance is improved, but the diatomaceous earth after use becomes an industrial waste, which is a major environmental problem.

Further, as a food filtering cloth other than the above, a woven cloth made of natural fibers such as cotton, silk, and hemp is used. There are drawbacks such as mixing. In order to prevent self-dusting in such food fabrics, it is effective to use synthetic fiber filaments. Filter cloths using synthetic fiber filaments have been proposed in the past, for example, see JP-A-63-171613. No., JP-A-64-80413
The invention described in Japanese Patent Laid-Open Publication No. H10-163, etc. has been proposed.

In Japanese Patent Application Laid-Open No. 63-171613,
Felts using microfibers have been proposed, but when used for food filtration, the dimensions change during repeated use, and a stable squeeze solution cannot be obtained.

Japanese Patent Application Laid-Open No. 64-80413 proposes a filter cloth having an integral structure of extra fine nap and a reinforcing cloth. However, when used for food filtration, there is a problem that nap is mixed into food. there were.

[0006] Also, Japanese Patent Application Laid-Open No. 3-4912 has the same problem as described above since it is proposed to use a napped fabric.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for producing various foods such as soy sauce, sake, wine, vinegar and tofu, which is substantially free of fluff in foods. In the moromi filtration process,
An object of the present invention is to provide an environmentally friendly food-use filter cloth which can exhibit the same filtration performance as soy sauce filtered with diatomaceous earth, and which is environmentally friendly.

[0008]

Means for Solving the Problems The food filtering fabric of the present invention which solves the above-mentioned problems has the following constitution (1), and as a preferred embodiment thereof, further one of (2) to (5) One or a plurality of configurations are combined. (1) Single fiber fineness is at least 0.011 dTex, 1.1 d
It is composed of a woven fabric composed of a synthetic fiber multifilament composite yarn of a raw yarn composed of ultrafine fibers of Tex or less and a crimped yarn composed of ultrafine fibers having a crimp of single fiber fineness of 0.011 dTex or more and 1.1 dTex or less. Made of woven fabric, and some or all of the fibers on the surface or inside are entangled. (2) Permeability of the woven fabric by ultrapure water is 1 or more and 10 m
1 / cm ² / sec or less, and the rejection when using Radiolight # 100 of JIS K 0102 method is 50 to 50 / sec.
95%. (3) The yarn length difference between the raw yarn and the crimped yarn constituting the synthetic fiber multifilament composite yarn is 3 to 25%. (4) The ultrafine fibers of the woven fabric are polyester fibers or / polyamide synthetic fibers. (5) The food filtering cloth is soy sauce, sake, wine, vinegar,
Or it must be used in the process of filtering tofu and other foods.

Further, the method for producing a food filtration fabric according to the present invention comprises the following constitution (6). As a preferred embodiment, one or more of the constitutions (7) to (9) are further provided. It has a combination. (6) In a woven / knitted greige machine composed of a raw yarn composed of a composite fiber that can be made ultrafine and a crimped yarn composed of a composite fiber that can be made ultrafine,
Fine knitting is performed to form a knitted fabric composed of ultrafine fibers, and then a high-pressure water stream is sprayed on the fabric to partially or substantially entangle the fibers on the surface or inside. (7) A synthetic fiber multifilament composite yarn having a yarn length difference of 5 to 25% between the raw yarn and the crimped yarn. (8) The ultra-fine-thinning conjugate fiber is a sea-island type conjugate fiber, and the ultra-thinning treatment is performed by treating with a solvent that dissolves the sea component of the sea-island type fiber. (9) The high-pressure water stream is injected from a number of small holes.
High-pressure water flow of 94 to 11.77 MPa.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.

The present inventors have conducted intensive studies in order to obtain a cloth which can solve the above-mentioned problems. As a result, a cloth made of an extra fine raw yarn and an extra fine crimped yarn was used, and the surface or the inner fiber was exposed to a high-pressure water flow. It has been found that such a problem can be solved at once by using a woven fabric in which a part or all of the doshi is entangled.

The woven fabric in which a part or the whole of the fibers inside or outside the surface is entangled by the high-pressure water flow, the fineness is partially or substantially entirely formed among the constituent fibers by the entanglement effect by the water jet. A large number of fine inter-fiber voids are formed, and the formed fine inter-fiber voids are also referred to in the art as a micro sponge structure, a micro pocket structure, or the like.

The ultrafine fibers used in the present invention are obtained by micronizing sea-island type composite fibers, exfoliated split type composite fibers or special polymer blend type composite fibers by an appropriate method. Can be various polymers such as polyester, polyamide, polyacryl, and polyolefin, and in the present invention, it is preferable to use polyester or / and polyamide polymers.

The synthetic fiber multifilament composite yarn used in the present invention is composed of at least two kinds of synthetic fibers. One of the fibers is a single fiber fineness yarn 0.01
Other fibers constituting the synthetic fiber multifilament composite yarn are raw yarns composed of ultrafine fibers of 1 or more and 1.1 dTex or less, and have a single fiber fineness of 0.011 or more and 1.1 or less.
It is a crimped yarn made of ultrafine fibers that have been crimped by temporary twist processing or the like of dTex or less.

Hereinafter, these will be described in detail.

First, crimped yarns made of crimped ultrafine fibers are important fibers for exhibiting the excellent filtration performance effect of the present invention. Generally, the thinner the fibers, the greater the effect. That is, the fiber has a large surface area and a large porosity. For example, in order to satisfy the effect of capturing fine particles contained in the mash of soy sauce, the fineness of the single fiber is preferably as small as possible, more preferably 0.033 dTex or more. 078dTex
A range of Single fiber fineness of crimped yarn is 0.011
In the case of less than dTex, for example, although the mash filtration performance of soy sauce is satisfactory, the fiber is worn due to repeated use, and fluff is generated due to breakage of single yarn and the like. . The single fiber fineness is 1.
If it exceeds 1 dTex, it becomes difficult to capture fine mash particles, and as a result, sufficient filtration tends to be impossible.

In the present invention, the crimps are applied to the ultrafine fibers by temporary twisting or the like to disturb the arrangement of the single fibers one by one, so that the surface area of the fibers has a large effect. Also increases. In addition, for example, the capture of mash fine particles of soy sauce is increased, and the filtration performance of the fabric is satisfied. When the ultrafine fibers do not have crimps, the arrangement of single fibers is not disturbed, and the bulkiness of the woven fabric is reduced, resulting in insufficient filtration performance.

The crimping of the ultrafine fibers can be performed by applying crimping such as temporary twisting to the ultrafine-thinning raw yarn before desealing or splitting.
A temporary twist of 0 to 4000 revolutions / m is applied, preferably 18
This is performed by performing a temperature treatment at 0 to 200 ° C.
The elongation ratio (crimp ratio) by crimping is preferably 15%.
The total fineness of the crimped yarn is preferably 40 dTex or more and 250 dTex or more.

The raw yarn composed of ultrafine fibers, which is another constituent fiber of the present invention, has a single fiber fineness of 1.1 dTex or less,
More preferably, it has a single fiber fineness equal to or greater than that of a crimped yarn made of crimped ultrafine fibers. Here, the raw yarn is a term used for the above-described crimped yarn, and refers to a straight yarn having substantially no crimp. The raw silk acts as a raw material for filtering food and constitutes the inner layer of the synthetic multifilament multifilament yarn, contributing to an increase in porosity and capture of, for example, moromi fine particles of soy sauce. The total fineness of the raw silk before the division is preferably 40 dTex or more and 200 dTex or less.

Further, the crimped yarn and the raw yarn may be used by being aligned or entangled.

The woven fabric constituting the fabric for filtering food according to the present invention is composed of a synthetic fiber multifilament composite yarn in which the raw yarn composed of the above-mentioned ultrafine fibers and the crimped yarn composed of the ultrafine fibers are combined and integrated. As described above, in the present invention, since at least two types of fiber yarns are compounded, the characteristics can be further emphasized by giving each yarn a difference in yarn length.

For example, the yarn length difference between the raw yarn composed of the ultrafine fiber of the present invention and the crimped yarn composed of the ultrafine fiber is preferably from 3 to 3.
It is 25%, more preferably in the range of 8 to 20%. If the yarn length difference between the two yarns is less than 5%, the space between the fibers is insufficient, resulting in insufficient filtration performance. When the content exceeds 25%, the voids increase, but the microfibers protrude excessively on the surface, and therefore, when repeatedly used, the microfibers tend to be entangled with each other, and a single yarn breakage tends to occur.

In the woven fabric of the present invention, the crimped yarn mainly forms the surface layer portion and the raw yarn forms the inner layer portion. Each of the yarns is entangled by water entanglement or water jet punching. It is more preferable that voids are generated due to the difference in swelling between the two yarns, and the effect of capturing, for example, mash fine particles of soy sauce is further enhanced.

Since the synthetic fiber multifilament composite yarn used in the present invention is composed of different ultrafine fibers as described above, in the state of a woven fabric, the crimped ultrafine yarn is selected on the surface due to the difference in each yarn length. Exposed and increase the air gap. Therefore, for example, it effectively acts to improve the mash filterability of soy sauce. In addition, the raw silk is located on the inner layer side of the crimped yarn, and as a result of raising the crimped yarn to the surface, the voids of the fabric are increased, for example, leakage from the crimped yarn on the surface in the filtration of soy sauce mash. It effectively acts on the filtration for recapturing the collected fine particles in the raw silk portion.

In the present invention, the ratio of the crimped yarn composed of ultrafine fibers to the synthetic fiber multifilament composite yarn is as follows:
40-80% is preferred. If the content is less than 40%, the surface of the woven fabric becomes plain, for example, the effect of enclosing the capture of moromi particles of soy sauce therein is lost, and if it exceeds 80%, the morphological stability tends to be lacking. In the present invention, around 50% is more preferable. The total fineness of the synthetic fiber multifilament composite yarn is preferably 80 dTex or more and 400 dTex or more. Further, the synthetic fiber multifilament composite yarn may be a synthetic fiber multifilament produced from one die or a yarn obtained by a method such as drawing and twisting.

The woven fabric according to the present invention is basically woven using such a synthetic fiber multifilament composite yarn for the course and the like. However, as long as the effects of the present invention are not impaired, other fibers and yarns may be used. Can be used in combination.

Specifically, as the synthetic fiber multifilament constituting the synthetic fiber multifilament composite yarn of the present invention, polyester fiber or / polyamide fiber can be used.

Examples of the structure of the fabric constituting the filter fabric for food of the present invention include plain weave, twill weave, satin weave, double weave, tricot and circular knit, and the like. It is preferable to eliminate bulkiness peculiar to the woven fabric using ultra-fine fiber yarn and to make it bulky, and, for example, to improve the mash filtration performance of soy sauce, double weave, twill weave,
Satin weave is particularly preferred.

The basis weight of the food filtering fabric of the present invention is not particularly limited, but is preferably 100 to 300 g.
/ M ^2, more preferably 150 to 250 g / m ²
It is. If the basis weight is 100 g / m ² or less, it lacks bulkiness,
If the filterability is poor, and if the basis weight is 300 g / m ² or more, the bulk tends to be too bulky and the workability tends to deteriorate.

The food filtration fabric of the present invention has a water permeability of ultrapure water of 1 ml / cm ² / sec or more and 10 ml / cm.
² / sec or less and a rejection of 50 to 9 when Radio Light # 100 of JIS K 0102 method is used.
5%. More preferably, the water permeability is 3 or more, 8 ml
/ Cm ² / sec or less, the rejection is 55 to 9 when using Radiolight # 100 according to JIS K 0102 method.
5%. The water permeability is less than 1 ml / cm ² / sec, and the rejection is more than 95%. As a result, in the case of moromi filtration of soy sauce, for example, a lot of moromi residue remains on the cloth, and sufficient filtration cannot be performed. . Also,
The water permeability is more than 10 ml / cm ² / sec, and the rejection is less than 50%. For example, most of the moromi fine particles of soy sauce pass through the cloth, and as a result, sufficient filtration cannot be performed. become.

Accordingly, it has been found that, by obtaining the water permeability and the rejection in the above ranges, for example, in mash filtration of soy sauce, it is possible to achieve filtration for foods having the same filtration performance as conventional diatomaceous earth filtration.

Further, in order to obtain the water permeability and the rejection, the weaving density also occupies a large factor. However, the cloth is not particularly limited as long as it is a cloth made of ultrafine fibers falling within the range of the water permeability and the rejection. .

Next, a method for producing the food filtration fabric of the present invention will be described.

First, for the production of ultrafine fibers, fiber yarns made of ultrafine composite fibers such as sea-island type composite fibers, exfoliated split type composite fibers and special blend type composite fibers are prepared. One is raw silk, the other is crimped by temporary twisting, etc., and the two are brought together, and if necessary, a yarn length difference is provided. Multifilament composite yarn.

As a means for combining the two yarns,
Examples include twisted yarn and entanglement, and fluid entanglement treatment with air or the like is particularly preferable.

Next, weaving is performed using the synthetic fiber multifilament composite yarn, and the obtained woven fabric is subjected to ultra-fine treatment to obtain a knitted woven fabric composed of ultra-fine fibers. Examples of the ultrafine treatment include chemical stripping, physical stripping, and dissolution and removal of one component. For example, when sea-island composite fibers are used, the fibers can be converted to ultrafine fibers by treating with a solvent that dissolves the sea component of the sea-island composite fibers.

Next, in the present invention, the woven fabric, which is preferably ultrafine if necessary, is subjected to jet of a high-pressure water stream, and a part or all of the fibers are entangled on the surface or inside the woven fabric.

As a result, the food-use filter cloth of the present invention has higher density and higher filter performance can be obtained. As described above, in order to make the present invention more effective, it is preferable to perform a water jet punching process on the surface of the woven fabric that has been subjected to the ultrafine processing such as the sea removal or dyeing process.
Specifically, the water purified by filtration is pressure-sprayed from the small holes onto the surface of the fabric.

The water pressure is preferably not less than 2.94 MPa and not more than 11.77 MPa, more preferably 4.9M.
Pa or more and 10.8 MPa or less, most preferably 7.8.
It is not less than MPa and not more than 9.8 MPa. 2.94MPa
If it is less than 50%, the effect of the processing is low, the entanglement of the fibers is insufficient, and if the pressure is 11.77 Pa or more, the fibers may be cut and cause fluff.

In addition, the water jet punching process shrinks the woven fabric, thereby imparting bulkiness and increasing the voids of the ultrafine fibers, thereby improving, for example, the mash filtration performance of soy sauce.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments. In addition, the measuring method and evaluation method of various physical properties followed the following. (1) Method of measuring water permeability: The measurement of water permeability is performed by bringing a filter cloth into close contact with a hole having a filtration area of 9.6 cm ² and a water height of 500 m.
m (500 ml) was kept flowing for several seconds so that ultrapure water (purified water from Ebisu Chemical Co., Ltd.) was maintained, and the amount of water coming out of the filter cloth was determined by the following equation.

Water permeability (ml / cm ² · second) = W / (9.
6 × T) W: Amount of water passed through the filter cloth (ml) T: Time required for passing (sec) (2) Rejection: The rejection was determined according to JIS K0102. That is, 500 ml of a solution prepared by dissolving Radiolight # 100 in ultrapure water was suction-filtered with filter paper, and the dried product was used as the filter paper weight of the standard filtrate. On the other hand, in the case of filtration with a filter cloth, 500 ml or more of the liquid is suction-filtered with a filter cloth, and a further 500 ml of the liquid is collected, suction-filtered with filter paper, and the dried product is taken as the filter paper weight. I asked.

Rejection (%) = ｛1− (BA) / (b−)
a)｝ × 100 A: Weight of filter paper before permeation of filtrate (cN) B: Weight of filter paper containing residual substances of filtrate (cN) a: Weight of filter paper before permeation of standard solution (cN) b: Filter paper weight including residue of standard solution (cN) (3) Filtration performance evaluation: Filtration evaluation was carried out by filtering moromi of soy sauce with a filter cloth for food and measuring the obtained soy sauce with a MULTISIZER measuring device manufactured by Coulter. And the average distribution of particles. (4) Turbidity measuring method: Turbidity was measured with an integrating sphere turbidity meter (SEP-PT-706D, manufactured by Mitsubishi Chemical Corporation). (5) Fluff drop: Judged by visual observation. (6) Yarn length difference measurement method: The yarn length difference measurement is performed by collecting 1.5 m of synthetic fiber multifilament conjugate fiber composed of raw yarn and crimped yarn, and then marking at 1 m to obtain a raw yarn portion and crimped yarn. Separate into parts. A constant load (0.09807 cN / 1.1 dTex) is applied to the lower end of each of the separated fibers,
The length of each yarn was measured at the marking portion, and determined by the following formula.

Yarn length difference (%) = {(La−Lb) / Lb}
× 100 La: length of crimped yarn under constant load (m) Lb: length of raw yarn under constant load (m) Example 1 As sea-island composite fiber, total fineness is 120 dTex,
18-filament (70 islands / filament) sea-island polyester, island component is polyethylene terephthalate, and sea component is 95.0 mol% of terephthalic acid and 5-sodium sulfoisophthalic acid 5 as acid components of polyester.
A fiber (having a sea-island ratio of 20/80) composed of an alkali-hot-water-soluble polyester composed of a mol% copolymer was used. This sea-island type fiber is temporarily twisted (number of temporary twists: 3000).
T / m, temperature: 180 ° C.), and a raw yarn of sea-island composite fiber having the same composition as above, having a total fineness of 120 dTex and 18 filaments, is supplied at a yarn length difference of 26% and aligned, and fluid entanglement treatment is performed. (Overfeed rate: 1
%, Air pressure 0.34 MPa) to obtain a synthetic multifilament composite yarn.

The composite raw yarn was used for warp yarn / weft yarn, respectively, to prepare a 2/2 twill weave fabric (raw machine).

The greige was treated with maleic acid at 130 ° C. for 30 minutes to embrittle the sea component.
Minutes with a sodium hydroxide solution to completely remove the sea component, and the single fiber fineness is 0.06 to 0.07 dT
ex, a woven fabric composed of ultrafine fibers was produced.

Next, the fabric was subjected to water jet punching at a water pressure of 9.8 MPa, and the obtained fabric had a basis weight of 170 g /
m ² . The water permeability of this fabric is 2.3 ml / cm ²
・ Sec, the rejection was 83.53%, and as a result of filtering the mash of soy sauce, the average particle size of the remaining particles of the filtered soy sauce was 4.29 μm, and the turbidity was 21 ppm, which was a good result. . The results are shown in Table 1. Example 2 Using a 150 dTex, 20 filament sea-island composite fiber having a polyester / polyamide mixture ratio of 50:50 and a single fiber fineness of 0.07 dTex after removal of the sea component, a yarn length difference between a raw yarn and a processed yarn A composite yarn was obtained in the same manner as in Example 1, except that the yarn was supplied at 7% and aligned.

The total fineness of the obtained composite yarn is 300 d
A flat double woven fabric (raw machine) was produced using the composite fiber of Tex. The woven fabric was treated with a sodium hydroxide solution at 98 ° C. for 45 minutes to completely remove the sea component, thereby producing a woven fabric composed of ultrafine fibers having a single fiber fineness of 0.07 to 0.08 dTex. Subsequently, water jet punching was performed in the same manner as in Example 1. The basis weight of the obtained woven fabric was 230 g / m ² .

The water permeability of this fabric was 3.51 ml / cm ²
・ Sec, the rejection was 82.31%, and as a result of filtering the mash of soy sauce, the average particle size of the remaining particles of the filtered soy sauce was 5.03 μm, and the turbidity was 53 ppm, which was a good result. . The results are shown in Table 1. Comparative Example 1 A 100% cotton filter cloth (woven structure: plain weave) was used. The single fiber fineness is represented by dTex, which is 1.60 dTex,
The width was 1.53 dTex. The basis weight is 210 g / m ²
Met. The water permeability of this fabric is 11.42 ml / cm ²
・ Sec, the rejection rate is 6.22%. As a result of filtering the moromi of soy sauce, the average particle size of the remaining particles of the filtered soy sauce is as large as 8.8 μm, and the turbidity is 183 ppm, which is sufficient filtration. Did not. The results are shown in Table 1.

Further, the filter cloth is formed by dust generation of the filter cloth.
There was a tendency to be mixed into food. Comparative Example 2 As a sea-island type composite fiber, a total fineness of 120 dTex,
An 18-filament (70 islands / filament) sea-island type polyester, the island component of which is polyethylene terephthalate, and the sea component is a copolymer of 95 mol% of terephthalic acid and 5 mol% of 5-sodium sulfoisophthalic acid as acid components of the polyester. The fiber (the ratio of sea-island (area) is 20/80) made of alkali-water-soluble polyester was used.

The sea-island type fiber was not crimped, and two raw yarns were aligned and used as warp yarns for the warp yarn and the weft yarn, respectively, to produce a 2/2 twill weave fabric (raw machine). .

This greige was processed in the same manner as in Example 1 to produce a woven fabric composed of ultrafine fibers having a single fiber fineness of 0.06 to 0.07 dTex. The weight of the obtained fabric is 185 g / m ^2.
Met.

There was no fluff, and in the mash filtration of soy sauce, the water permeability of the fabric was 6.1 ml / cm ² · sec, the rejection was 33.14%, and the average particle size of the filtered soy sauce remaining particles was: Large 7.8 μm, turbidity is 165 ppm
And sufficient filtration could not be performed. The results are shown in Table 1. Comparative Example 3 Instead of the ultrafine fibers, a total fineness of 100 dTex, 4
An ordinary polyester fiber having a length of 8 filaments and a single fiber fineness of 2.1 dTex was used. Temporary twist processing (number of temporary twists: 3000 T /
M, temperature: 180 ° C.), and the same as a normal polyester filament yarn having a total fineness of 100 dTex, 48 filaments and a single fiber fineness of 2.1 dTex.
% And an air pressure of 0.34 MPa) to obtain a composite yarn.

The composite yarn was used for the warp yarn and the weft yarn, respectively, to prepare a 2/2 twill weave fabric (raw machine). This greige was subjected to a normal relaxing scouring process.

The basis weight of the finished fabric was 225 g / m ² . The water permeability of this fabric is 13.39 ml / cm ² · s
ec, the rejection was 3.9%. As a result of filtering the mash of soy sauce, the average particle size of the remaining particles of the filtered soy sauce was 9.
09 μm, and the turbidity was 207 ppm, which was insufficient. Table 1 shows the results.

On the other hand, when the wine or the sake was filtered using the filter cloths of Examples 1 and 2, grape residue or sake lees were sufficiently left on the filter cloth, and the obtained wine or sake had a good taste. There was something.

Further, in the tofu-filtering, as represented by the silk-filtering, it was possible to obtain tofu having a fine umami.

When filtration was performed with the filter cloths of Comparative Examples 3 to 5, the filter performance was insufficient for all filter cloths.
The taste was slightly insufficient.

[0059]

[Table 1]

[0060]

The fabric for filtering food of the present invention, having the above-mentioned constitution, exhibits excellent filtration performance without being mixed into food due to fluffing.

The food filtering cloth of the present invention, for example, in mash filtration of soy sauce, exhibits fine filtration performance that has not been obtained in the past because fine particles of mash are captured by a large amount of voids.

Further, for example, it is possible to obtain umami in the filtration step of wines, alcoholic beverages, etc., and to obtain very fine umami tofu, such as tofu, typified by silk filtration. Can be.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 39/16 B01D 39 / 16Z C12G 1/00 C12G 1/00 3/02 119 3/02 119T D03D 11 / 00 D03D 11/00 (72) Inventor Hideki Ando 3-7-4 Toei, Ojiya City, Niigata Prefecture Inside Yamazaki Brewing Co., Ltd. (72) Inventor Atsuo Watanabe 8050 Igarashi 2, Niigata City, Niigata Pref. Niigata University Graduate School F Terms (reference) 4B015 KP01 KP03 4B020 LB01 LC01 LP12 LQ05 4B039 LB01 LC10 LR01 4D019 AA03 BA13 BB02 BD01 DA03 DA05 DA06 DA08 4L048 AA20 AA24 AA29 AA35 AB08 AB21 BA01 BA02 BA09 CA00 DA40 EB00

Claims (9)

[Claims] (1) a single fiber fineness of at least 0.011 dTex;
A woven fabric composed of a synthetic fiber multifilament composite yarn of a raw yarn composed of ultrafine fibers of 1.1 dTex or less and a crimped yarn composed of ultrafine fibers having a single fiber fineness of 0.011 dTex or more and 1.1 dTex or less. Characterized in that a part or all of the fibers on the surface or inside are entangled with each other. 2. The woven fabric according to claim 1, wherein said woven fabric has a water permeability of ultrapure water of 1 to 1
At 0 ml / cm ² / sec, the rejection when using Radio Light # 100 according to JIS K 0102 method is 50 to 50%.
The fabric for filtering food according to claim 1, wherein the content is 95%. 3. The food filtration fabric according to claim 1, wherein the yarn length difference between the raw yarn and the crimped yarn constituting the synthetic fiber multifilament composite yarn is 3 to 25%. 4. The fabric for filtering food according to claim 1, wherein the ultrafine fibers of the woven fabric are polyester synthetic fibers and / or polyamide synthetic fibers. 5. The food according to claim 1, wherein the food filtration fabric is used in a food filtration step of soy sauce, sake, wine, vinegar or tofu. Cloth for filtration. 6. A fabric greige machine composed of raw yarns composed of ultrafine composite fibers and crimped yarns composed of ultrafine composite fibers, is subjected to ultrafine treatment to form a woven fabric composed of ultrafine fibers. A method for producing a fabric for filtering food, wherein a high-pressure water stream is jetted onto a woven fabric to partially or substantially entangle the fibers on the surface or inside. 7. The yarn length difference between the raw yarn and the crimped yarn is 5 to 25%.
The method for producing a food filtration fabric according to claim 6, wherein the synthetic fiber multifilament composite raw yarn is used. 8. The method according to claim 8, wherein the ultrafine-thinning conjugate fiber is a sea-island type conjugate fiber, and the ultra-thinning treatment is performed by treating with a solvent that dissolves the sea component of the sea-island type fiber. The method for producing a food filtration fabric according to claim 6 or 7, wherein: 9. The fabric for filtering food according to claim 6, wherein the high-pressure water stream is a high-pressure water stream of 2.94 to 11.77 MPa injected from a large number of small holes. Manufacturing method.