JP3051522B2 - Filter for extracting beverages, bag for extraction, and method for producing filter / bag for extraction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to extraction of raw materials such as roasted and ground coffee beans and tea leaves with tap water, such as coffee, black tea, and various kinds of tea such as green tea, for use in beverages and the like. The present invention relates to an extraction filter and an extraction bag (small bag) used when extracting the component, and a method of manufacturing the extraction filter and the extraction bag.

[0002]

2. Description of the Related Art Tap water used as drinking water contains chlorine for sterilization and disinfection. In particular, the amount of chlorine mixed into tap water increases in summer or the like when water quality deteriorates. When the concentration of free chlorine in tap water is high, the so-called scent of kelp becomes strong, and when such tap water is used as extraction water for various kinds of tea such as coffee, black tea, green tea, etc. It will be severely impaired. In addition, when free chlorine is present in tap water, the chlorine reacts with organic substances contained in coffee and tea to produce trihalomethane, a harmful substance that is suspected as a carcinogen, and the chlorine concentration in tap water decreases. The higher the value, the higher the amount of trihalomethane produced. Therefore, it is desirable to minimize the amount of free chlorine in tap water provided for beverages and the like.
Household water purifiers using an adsorbent such as activated carbon have become popular. In addition to the method of physically adsorbing and removing chlorine in tap water, various proposals have been made to remove the chlorine odor of tap water by chemically neutralizing free chlorine.

For example, Japanese Patent Application Laid-Open No. 63-80898 discloses that powders of green tea, oolong tea, vitamin C (L-ascorbic acid), tannic acid and the like are granulated with a water-soluble molding agent.
There is disclosed a technique in which the granules are poured into tap water to remove calcium from tap water.
In addition, JP-A-1-281193 discloses a water purifier containing a water purifier containing ascorbic acid or a salt thereof in a water-permeable nonwoven fabric, and immersing the water purifier in tap water. There is disclosed a technique for removing the odor of tap water and the like. Furthermore, Japanese Patent Application Laid-Open No. Sho 62
No. 44137 discloses that when extracting a coffee extract from coffee beans with a solvent, L-ascorbic acid and an alkali metal salt of L-ascorbic acid or an alkali metal salt of L-ascorbic acid are added to an extraction solvent or an extract obtained by extraction. A method of obtaining a coffee extract in which the flavor unique to coffee is maintained at room temperature for a long time by adding the same is disclosed.

[0004]

A method for neutralizing free chlorine in tap water by using ascorbic acid or a salt thereof to remove the odor of tap water has been known as described above. However, in the conventional methods, tap water obtained by granulating ascorbic acid powder with a molding agent or tap water containing a water purification agent containing ascorbic acid or a salt thereof in a water-permeable nonwoven fabric is used. Immersed in water or ascorbic acid salt is directly added to the water to improve the quality of the water, and then the purified water is to be used as coffee extraction water, or The purpose is to add a salt of ascorbic acid to an extract obtained by extracting coffee beans. Therefore, each time the extraction of coffee or the like is to be performed, a necessary amount of tap water is taken into a container, the tap water is purified, and then the purified water is heated and extracted. Heated water must be obtained, and the conventional method is extremely troublesome and troublesome in ordinary households, even if it is considered to be used on an industrial scale or in a branch. This is a method that is unlikely to be used in practice, as it may produce too much water. In addition, in a method of adding a salt of ascorbic acid to an extract obtained by extracting coffee beans,
At the time of extraction, free chlorine in tap water reacts with organic matter contained in coffee to produce trihalomethane, and therefore, the effect of suppressing the production of trihalomethane by adding ascorbic acid cannot be expected.

[0005] The present invention has been made in view of the above circumstances, and is intended to obtain beverages such as coffee and tea by an extraction operation using tap water.
Even if tap water is not purified in advance, free chlorine in tap water can be eliminated by simply heating tap water or, in some cases, using it without heating and performing a normal extraction operation. To provide an extraction filter and an extraction bag capable of obtaining a beverage or the like having no odor and a low production amount of trihalomethane, and to manufacture such an extraction filter and an extraction bag. It is a technical task to provide a new method for the above.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method for evaporating a solution in which ascorbic acid or a salt thereof (hereinafter referred to as "ascorbic acid") is dissolved on the entire surface of a filter material made of a fibrous material. The point is that ascorbic acid or the like is attached in the form of a residue. Then, using such a filter material, forming it into a predetermined shape to constitute a filter for extracting beverages and the like, and forming the filter material into a small bag-like shape, and enclosing the extraction raw material therein. A bag for extracting beverages and the like is configured.

As the filter material, it is preferable to use a nonwoven fabric made of melt blown fibers having a thickness of 0.1 denier or less.

[0008] In the extraction filter or the extraction bag having the above-described structure, when tap water is contacted with the filter material when the tap water is heated or used without heating to extract coffee or tea. Ascorbic acid, etc. attached to the filter material reacts with free chlorine in tap water,
Chlorine, which is an oxidizing substance, is neutralized by ascorbic acid, which is a reducing substance, and disappears.

In particular, in the extraction bag, the extraction raw materials such as roasted and ground coffee beans and tea leaves enclosed in the bag are neutralized by free chlorine in the tap water while the tap water passes through the filter material. Since it is in constant contact with the water that has disappeared as a result, the production of trihalomethane due to the reaction between organic matter contained in coffee beans and tea leaves and free chlorine is effectively suppressed.

Further, since ascorbic acid and the like are attached to the filter material in the form of an evaporation residue of the solution, powdered ascorbic acid or the like is merely applied by spraying on the surface of the filter material. Unlike this, ascorbic acid and the like do not drop off from the surface of the filter material even by impact due to vibrations during transportation, and ascorbic acid and the like are stably held on the surface of the filter material.

As a method for producing the above-mentioned extraction filter and extraction bag, a solution prepared by dissolving ascorbic acid or the like in a solvent is applied to the entire surface of a filter material made of a fibrous material. The entire surface of a filter material made of a porous material is immersed in a solution in which ascorbic acid or the like is dissolved in a solvent to impregnate the solution into the filter material, and then the solvent is evaporated from the filter material surface to remove ascorbic acid or the like. The solid is allowed to adhere to the entire surface of the filter material.

As the solvent for dissolving ascorbic acid and the like, it is preferable to use an aqueous ethanol solution.
It is desirable that the ethanol concentration of the aqueous ethanol solution be 60% or more.

When an aqueous ethanol solution (ethanol when the ethanol concentration is 100%) is used as a solvent for dissolving ascorbic acid or the like, the solution in which ascorbic acid or the like is dissolved can be dried in a very short time. . Therefore, since it takes time to evaporate and dry the solution impregnated in the filter material, the filter material may be wound up in a roll shape while keeping the filter material moist, and microorganisms such as molds may be generated during storage and become unusable. On the other hand, there is no need to worry that the filter material is left unwound and expanded without being wound up until it is completely dried, which wastes large space and causes inconvenience in the process. Ethanol itself is one of the food components, and there is no problem even if it remains in the filter material. Moreover, since ethanol has a sterilizing effect, the filter material is sterilized when an ethanol aqueous solution is applied to the filter material or when the filter material is immersed in the ethanol aqueous solution.

[0014]

Embodiments of the present invention will be described below.

In the filter for extracting beverages and the bag for extraction according to the present invention, ascorbic acid or a salt thereof adheres to the entire surface of a filter material made of a fibrous material in the form of an evaporation residue of a solution in which ascorbic acid is dissolved. doing.

Here, ascorbic acids include L-
In addition to ascorbic acid, those having the same biochemical efficacy can be used. For example, 6-deoxyascorbic acid, L-ramanoascorbic acid, D-erythorbic acid (D-isoascorbic acid), L- Ascorbic acid stearic acid ester or the like can be used, and an appropriate one of them may be used, or a combination of two or more thereof may be used. Further, as the salts of ascorbic acids, alkali metal salts such as sodium salts and potassium salts of the above compounds can be used.
Ascorbic acid is an enol type, and forms an oxidation-reduction system in an aqueous solution with keto-type dehydroascorbic acid,
It is known that they change reversibly with each other. Therefore,
In the solution, it is conceivable that ascorbic acid is also present as an intermediate when reversibly changed, or as a compound generated by the redox action of ascorbic acid.

The material and structure of the filter material are not particularly limited, and a wide range of materials can be used. That is, as a material of the filter material, an appropriate one is selected from organic synthetic fibers or natural or semi-synthetic cellulose fibers, and one kind of the fibers is used alone or two or more kinds of fibers are used. May be used in combination. The structure of the filter material may be a dry or wet nonwoven fabric, a woven fabric, or a knitted fabric, or two of them may be laminated and used. Here, the nonwoven fabric also includes paper.

As described above, a wide range of materials can be used as the filter material. Particularly, as the filter material for the extraction filter or the extraction bag used for extracting coffee, fine particles contained in the extraction raw material are used. Nonwoven fabrics made of meltblown fibers which are excellent in the leakage prevention performance of oil and fats and oils and have a high filtration rate are suitable. Melt blown fibers are ultra-fine thermoplastic organic short fibers. This meltblown fiber is made from a thermoplastic polymer,
As the thermoplastic polymer, it is preferable to use polyolefin, polyamide or polyester, and among them, it is most preferable to use polyethylene or polypropylene. Further, the thickness of the single yarn of the melt blown fiber is preferably 0.1 denier or less, more preferably 0.01 to 0.08 denier, and still more preferably 0.1 denier.
It is 04-0.05 denier. In addition, since the nonwoven fabric of the melt blown fiber is extremely thin, it is more preferable to use it by laminating it with another nonwoven fabric such as spun bond.

Next, in order to attach ascorbic acid or the like to the filter material, a solution is prepared by dissolving ascorbic acid or the like in a solvent, and the solution is applied to the entire surface of the filter material, or the solution is added to the filter material. After impregnating the filter material with the solution by immersing the entire surface of the material,
The solvent is evaporated from the surface of the filter material so that solids such as ascorbic acid remain on the entire surface of the filter material.

As a solvent for dissolving ascorbic acid or the like, water, alcohol or a mixture of water and alcohol is used. As the alcohol, ethanol is preferable, and other than that, it can be added to food and has bactericidal properties.
Polyhydric or polyhydric alcohols such as isopropanol, propylene glycol and the like can also be used.

FIG. 4 shows the drying time and the residual amount of solution when a saturated amount of ascorbic acid is dissolved in various concentrations of ethanol aqueous solution, and each solution is impregnated into a filter material and dried. It is a diagram showing the relationship with the rate. Each solution was added dropwise at a ratio of 0.1 ml to 0.1 g of the filter material (nonwoven fabric), and the nonwoven fabric impregnated with the solution was dried in air at a temperature of 25 ° C.

As can be seen from FIG. 4, the nonwoven fabric impregnated with the aqueous solution of ascorbic acid does not evaporate so much even after being dried for 30 minutes, whereas the nonwoven fabric impregnated with an ethanol (100%) solution of ascorbic acid is obtained. Then 4
The drying is almost completed in a minute and the ascorbic acid is
In the case of a nonwoven fabric impregnated with a solution dissolved in a mixed solution of ethanol and water at about%, drying is almost completed in about 15 minutes.

As described above, when water is used as a solvent for dissolving ascorbic acid or the like, it takes much time to dry the filter material impregnated with the solution.
For this reason, if the filter material is wound into a roll within a short time after the filter material has been impregnated with the aqueous solution, microorganisms such as molds and the like may be found during storage of the filter material because the filter material is not sufficiently dried. They breed and become unusable. On the other hand, keeping the filter material unwound and unrolled until the water completely evaporates from the filter material requires a large amount of space, hinders other work, and reduces work efficiency. It will be significantly reduced. After the filter material is impregnated with the aqueous solution, the filter material is removed by a heater, hot air, or the like.
In the case of instantaneously drying by intensifying the temperature above ℃, there is a possibility that ascorbic acid or the like may be decomposed, and the filter material made of a nonwoven fabric or the like may be browned. From these points, it is more preferable to use ethanol or a mixed solution of ethanol and water as a solvent for dissolving ascorbic acid and the like. In addition, even if ethanol remains in the filter material, it is completely harmless and safe, and since ethanol has a bactericidal action (maximum in a 60 to 80% aqueous solution), a bactericidal effect on the filter material can be expected.

FIG. 5 is a graph showing the relationship between the mixing ratio of ethanol in an ethanol-water mixture and the amount of ascorbic acid dissolved in the mixture. The amount of ascorbic acid dissolved is greatest when the mixing ratio of ethanol is 0%, that is, when the ascorbic acid is dissolved in water. At the time of dissolution, the dissolution amount is as small as 2%. Here, the larger the amount of ascorbic acid attached to the filter material, the better, and therefore, the larger the amount of ascorbic acid dissolved in the solution impregnated in the filter material, the more preferable.

FIG. 6 is a graph comparing the effect of suppressing the production of trihalomethane between the system in which the amount of ascorbic acid contained in the aqueous solution is insufficient and the system in which ascorbic acid is excessively present. For the system lacking ascorbic acid, half the amount of ascorbic acid necessary for neutralizing free chlorine in water was mixed with water, and the concentration of trihalomethane when heated at 80 ° C. for 10 minutes was measured. On the other hand, in the case of an ascorbic acid-excess system, after mixing twice the amount of ascorbic acid necessary for neutralizing free chlorine in water with water, the trihalomethane when heated at 80 ° C. for 10 minutes is mixed. The concentration was measured.

As can be seen from FIG. 6, the amount of trihalomethane produced can be kept low in a system with excess ascorbic acid, but in a system lacking ascorbic acid, a large amount of trihalomethane is produced when the concentration of free chlorine increases. Therefore, the amount of ascorbic acid adhering to the filter material is desirably set to an excess amount relative to the chemical equivalent required to neutralize free chlorine in water, for example, a tap water containing 0.5 ppm of free chlorine. If one tea bag is used for 150 ml of water, add 0.18 mg to the tea bag.
It is necessary to adhere ascorbic acid of (chemical equivalent) or more.

From the results shown in FIG. 4, in consideration of drying of the filter material after the impregnation of the solution, the mixing ratio of ethanol in the ethanol-water mixture is preferably set to 60% or more, while the mixing ratio shown in FIG. The results show that the amount of ascorbic acid dissolved in a 60% aqueous ethanol solution is about 16%. Therefore, even if an ascorbic acid solution is prepared using an ethanol-water mixed solution in which the proportion of ethanol is 60% or more, the filter material is not removed. To a sufficient amount of ascorbic acid. Further, in consideration of both the drying speed of the filter material after the solution impregnation and the amount of ascorbic acid dissolved in the solution, it is more preferable to use an aqueous ethanol solution having an ethanol concentration of 80 to 90% as the solvent for dissolving ascorbic acid. .

In order to use as a solvent an ethanol-water mixture in which the proportion of ethanol is 60%, and to carry out the operation of attaching ascorbic acid to the filter material, first, a saturated amount of ascorbic acid is dissolved in the mixture, The saturated mixed solution is sprayed or applied to the entire surface of a filter material such as a non-woven fabric to impregnate it. After the impregnation, the ethanol content of the mixed solution evaporates immediately from the filter material surface, and the amount of liquid contained in the filter material is drastically reduced to 40% or less of the initial amount. Before the film is wound up, it is easily heated and evaporated by a heater or the like. As a result, a filter material having ascorbic acid firmly adhered to the entire surface is obtained.

When 100% ethanol is used as a solvent, an ethanol solution in which a saturated amount of ascorbic acid is dissolved may be directly applied to a filter material such as a nonwoven fabric. Preferably, an emulsion solution is prepared by mixing microcrystals of ascorbic acid into the mixture, and the emulsion solution is preferably applied to a filter material. In this way, when the filter material is dried, the microcrystals originally present in the solution are firmly attached to the filter material surface by the microcrystals newly precipitated with the drying. , The amount of ascorbic acid attached can be increased.

FIG. 1 shows a case where a mixture of ethanol and water having a mixing ratio of ethanol of 90% was used as a solvent, and a solution obtained by dissolving a saturated amount of ascorbic acid in the mixture was used as a melt-blown fiber. 4 is a scanning electron micrograph (× 300) showing a state in which ascorbic acid particles are adhered to meltblown fibers when ascorbic acid is adhered to a nonwoven fabric. From this photograph, it can be seen that the evaporation rate of the liquid from the surface of the nonwoven fabric is high, so that ascorbic acid is firmly fixed to the fiber as a film-like amorphous solid.

FIG. 2 is a scanning electron micrograph (similar to the above) when ascorbic acid is adhered to a nonwoven fabric similar to the above using an aqueous solution in which a saturated amount of ascorbic acid is dissolved in water. 300 times). From this photo,
It can be seen that since much time is required for drying the nonwoven fabric, ascorbic acid is crystallized in the drying process, and the ascorbic acid is fixed while being entangled with the fibers in a crystalline state.

FIG. 3 is a scanning electron micrograph (× 300) similar to that described above when the powder of ascorbic acid is simply sprayed onto the surface of a nonwoven fabric similar to the above and attached. From this photograph, it was found that the ascorbic acid powder was attached between the fibers in a form that was very easy to fall off.According to this attachment method, the ascorbic acid powder was filtered by the impact of vibration during transportation. This method is not practical because it easily falls off from the material side.

The extraction filter is manufactured by cutting the filter material manufactured as described above and forming it into a predetermined shape. Further, by cutting the filter material and forming it into a small bag shape, an extraction bag is manufactured,
The extraction raw material is sealed in the inside to be a final product.

Here, coffee and various kinds of tea, that is, black tea (fermented tea), oolong tea (semi-fermented tea), sencha, etc. are extracted using the extraction filter and the extraction bag according to the present invention. The most popular drinks are green tea, roasted green tea, barley tea, etc., but also include seasonings such as boiled dried soup, dashi kombu, bonito, and herbs such as genoshoko and dokudami.

When the extraction filter or the extraction bag of the present invention is used and tap water is used as an extraction solvent to extract coffee or tea, 0.3 to 0.5 is usually added to the tap water.
About ppm of free chlorine contained therein is neutralized by ascorbic acid or the like attached to the filter material and disappears. As a result, the scent of tap water is completely removed and the flavor of coffee etc. is improved, and trihalomethane is produced by the reaction of free chlorine with organic substances leaching into the liquid from coffee beans and tea leaves. Will also be suppressed.
Furthermore, the antioxidant effect of ascorbic acid and the like (hydrophilic) on coffee and tea extract components, especially hydrophilic substances, makes the coffee and tea taste mild, and the solution is kept in a mild reducing state. Deterioration of taste and discoloration due to oxidation are prevented. In addition, ascorbic acid or the like presents a refreshing light acidity when present in a liquid at a low concentration, and thus increases the flavor in combination with the taste of coffee or the like.

When coffee or tea is extracted, heat of 80 ° C. or higher is usually used. FIG. 7 shows the results of an examination of the effect of heating on the effect of ascorbic acid.

As can be seen from FIG.
If the water containing m is heated as it is, the production amount of trihalomethane increases as the heating temperature increases. On the other hand, ascorbic acid is added to water containing 50 ppm of free chlorine.
When the water is heated to a concentration of 00 ppm and the water is heated, the amount of trihalomethane produced hardly changes even if the heating temperature is increased. This shows that even if the water in which ascorbic acid is dissolved is heated to about 90 ° C., the neutralizing action of ascorbic acid on free chlorine is not impaired. Therefore, it was confirmed that ascorbic acid sufficiently exerted its effect even when hot water was used for extracting coffee or tea.

Next, more specific experimental examples and their results will be described.

[Experimental example 1]

First, an extraction bag was manufactured as follows. That is, a nonwoven fabric made of polypropylene meltblown fiber was used as the filter material. An ascorbic acid solution is prepared by dissolving ascorbic acid to a concentration of 2.5% in an ethanol-water mixed solution in which the mixing ratio of ethanol and water is 9: 1, and the ascorbic acid solution is used as the filter material. And filter material 1cm ²
0.2 μl per (the surface area of one extraction bag is about 20
0 cm ² , so about 0.02 per extraction bag
ml) by a coating roller and then air dried. As a result, a filter material to which about 1 mg of ascorbic acid had adhered per one extraction bag was obtained, and this was cut and formed into a small bag to produce an extraction bag. Tap water 2 containing 0.5 ppm free chlorine
If one tea bag is used for every 00 ml, the amount of ascorbic acid required to neutralize free chlorine is 0.1%.
24 mg, and the extraction bag has a chemical equivalent of about 4
This means that twice the amount of ascorbic acid is attached.

The roasted and ground coffee beans are sealed in the above-mentioned extraction bag, the bag is immersed in boiling water heated with tap water, and the bag is gently shaken for 1 minute in hot water to extract coffee. After that, the concentration of trihalomethane in the coffee liquid was measured. As a comparative example, a conventional extraction bag to which ascorbic acid was not attached was used, and after performing the same operation, the concentration of trihalomethane in the coffee liquid was measured. The tap water used in this experiment contained 0.5 ppm of free chlorine. In addition, tap water after boiling contained 27 ppb of trihalomethane.

As a result of the experiment, when the extraction bag according to the present invention was used, the concentration of trihalomethane in the coffee liquor was 60 ppb, while when the conventional extraction bag was used, the concentration of trihalomethane was 93 ppb. Met. From these results, it was confirmed that the use of the bag for extraction according to the present invention had an effect of suppressing the generation of trihalomethane.

[Experimental example 2]

Using the same extraction bag used in Experimental Example 1, roasted and ground coffee beans, black tea, roasted green tea, and sencha were separately sealed in the extraction bag, and tap water was heated to 80 ° C. After each bag was immersed in the heated water for 3 minutes to perform extraction, the color change of each obtained extract was examined over time. As a comparative example, using a conventional extraction bag to which ascorbic acid is not attached,
Performed the same operation

[0045]

[Table 1]

As can be seen from Table 1, with respect to coffee, black tea and roasted tea, those using the extraction bag to which ascorbic acid was adhered were compared with those using the conventional extraction bag. The change in color of the liquid over time was small, and it was confirmed that when the extraction bag according to the present invention was used, there was an effect of preventing discoloration of the extract. On the other hand, as for sencha, there was almost no difference in the degree of discoloration between the case using the extraction bag to which ascorbic acid was adhered and the case using the conventional extraction bag. However, when the ascorbic acid-attached bag is used, the color change direction is in the yellow-green direction, which is preferable for tea, whereas when a conventional bag to which ascorbic acid is not attached is used, the color change direction is The direction was brown, which is undesirable for tea. From this result, it was confirmed that when the extraction bag according to the present invention was used, sencha was also effective against discoloration of the extract.

[0047]

Since the present invention is constructed and operates as described above, when extracting coffee, tea or the like using the extraction filter or the extraction bag according to the present invention, free chlorine is contained. Even in the case of using used tap water, free chlorine in tap water can be eliminated by performing a normal extraction operation without performing any troublesome operation of purifying the tap water in advance. It is possible to obtain beverages and the like that have no odor and generate a small amount of trihalomethane, and can easily produce palatable beverages and the like with excellent flavor even in ordinary households.

Further, if the filter bag for extraction is manufactured by the method according to the present invention, unlike the case where powdery ascorbic acid or the like is simply impregnated on the surface of the filter material, it is different from ascorbic acid or the like. Can be stably held on the surface of the filter material, and an extraction filter or an extraction bag can be obtained in which ascorbic acid or the like does not drop off even by an impact due to vibration during transportation.

The extraction filter according to the present invention
In the method for producing a bag, when an aqueous ethanol solution is used as a solvent for dissolving ascorbic acid or the like, the filter material can be dried in a short time. This does not cause the filter material to become unusable or waste the space for the drying place and cause inconvenience in the process.

[Brief description of the drawings]

FIG. 1 is a scanning electron micrograph showing a particle structure in a state where ascorbic acid particles are adhered to melt blown fibers when a nonwoven fabric is impregnated with a solution in which ascorbic acid is dissolved in an aqueous ethanol solution and then dried. It is.

FIG. 2 shows a particle structure in which ascorbic acid particles adhere to meltblown fibers when a nonwoven fabric is impregnated with an aqueous solution of ascorbic acid dissolved in water and then dried.
It is a scanning electron microscope photograph which shows a structure .

FIG. 3 is a scanning electron micrograph showing a particle structure in a state where ascorbic acid particles are adhered to melt-blown fibers when a powder of ascorbic acid is simply sprayed onto the surface of a nonwoven fabric and adhered.

FIG. 4 is a diagram showing a relationship between a drying time and a solution remaining rate when ascorbic acid is dissolved in aqueous ethanol solutions of various concentrations, and each solution is impregnated into a filter material and dried.

FIG. 5 is a graph showing the relationship between the mixing ratio of ethanol in an ethanol-water mixture and the amount of ascorbic acid dissolved in the mixture.

FIG. 6 shows a system in which the amount of ascorbic acid contained in an aqueous solution is insufficient and a system in which ascorbic acid is excessively present,
It is the diagram which compared the production suppression effect of trihalomethane.

FIG. 7 is a diagram showing the effect of heating on the effect of ascorbic acid.

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Sadahiro Nakanishi 14-3 Mukojima Nakajimacho, Fushimi-ku, Kyoto-shi (72) Inventor Yoshiesuke Ueno 21-27 Centaur Yasui Kadomachi, Ukyo-ku, Kyoto-shi Toporia Uzumasa II102 (72) Inventor Kaichi Suzuki 23-14 Uchihatacho, Hanazono, Ukyo-ku, Kyoto (72) Inventor Hiroshi Tsuji 5-3-60, Honcho, Toyonaka-shi, Osaka (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 77 / 00 A47J 31/06 B65B 29/00

Claims (7)

(57) [Claims] 1. A filter for extracting beverages or the like in which a filter material made of a fibrous material is formed in a predetermined shape, wherein the form of evaporation residue of a solution in which ascorbic acid or a salt thereof is dissolved is formed on the entire surface of the filter material. A filter for extracting beverages or the like, characterized in that ascorbic acids or salts thereof are adhered thereto. 2. The filter for extracting beverages and the like according to claim 1, wherein the filter material is formed using a nonwoven fabric made of melt blown fibers having a thickness of 0.1 denier or less. 3. An extraction bag for a beverage or the like in which a filter material made of a fibrous material is formed in a small bag shape and an extraction raw material is enclosed therein, wherein ascorbic acid or its ascorbic acid is formed on the entire surface of the filter material. An extraction bag for beverages or the like, wherein ascorbic acids or a salt thereof are adhered in the form of an evaporation residue of a solution in which a salt is dissolved. 4. The bag for extracting beverages and the like according to claim 3, wherein the filter material is formed using a nonwoven fabric made of melt blown fibers having a thickness of 0.1 denier or less. 5. A solution obtained by dissolving ascorbic acid or a salt thereof in a solvent is applied to the entire surface of a filter material made of a fibrous material, or the entire surface of the filter material made of a fibrous material is coated with an ascorbic acid or a salt thereof. Is immersed in a solution in which the solvent is dissolved, and after the filter material is impregnated with the solution, the solvent is evaporated from the surface of the filter material, and solids of ascorbic acids or salts thereof are left and adhered to the entire surface of the filter material. A method for producing a filter bag for extracting beverages and the like. 6. The method according to claim 5, wherein the solution is prepared by dissolving ascorbic acids or a salt thereof in an aqueous ethanol solution. 7. An ethanol solution having an ethanol concentration of 6
The method for producing a filter bag for extracting beverages or the like according to claim 6, wherein the content is 0% or more.