JP4078344B2 - Method for producing cocoon grass sheet - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a method for producing a licorice sheet using licorice and an antibacterial / deodorant pesticidal sheet having antibacterial / deodorant properties by a green tea component. More specifically, the present invention relates to an antibacterial / deodorant cocoon sheet that is used as a tatami mat, a rug, etc., and whose antibacterial / deodorant property by a green tea component is not impaired by wiping off dirt or the like, and a method for producing the same.

  In recent years, research on various ingredients contained in food materials has progressed along with health orientation, and attention has been focused on effective use of the functions. When functions such as antibacterial and deodorizing properties of green tea components such as catechins are known, it is attempted to provide products with added functions using green tea and green tea extracts. For example, green tea and its extracts can be used for building materials and filters. Techniques for blending and applying these have been developed.

  In the flooring field, mud-dyed and dried cocoon grass is dyed with green tea and then processed into a rug, and then the tea-dyed cocoon grass rug is manufactured by JA Fukuoka Yame and sold at JA Fukuron. An antibacterial and deodorant licorice product produced by immersing and dyeing in tea juice is disclosed. Moreover, in the following patent document 2, the tatami mat which has the antibacterial property which manufactured the sheet | seat soaked with the green tea extract liquid in the tatami floor is manufactured.

JP-A-11-303367 Japanese Patent Laid-Open No. 9-072072

  However, in the case of a rug produced using green tea-dyed licorice, moisture penetrates into the stalk of the licorice, so that the dyeing and drying are repeated twice [Recommendation-(dyeing dyeing)-drying-green tea dyeing. -Drying causes the moisture content of the grass to fluctuate violently, and the expansion and contraction are repeated, so that the strength of the grass is reduced and the grass tends to break during processing. Furthermore, since there is a step of immersing 0.8 to 1.8 m long licorice in tea juice and causing breakage, breakage, etc., the yield is poor, and the outside is also exposed to sunlight, moisture, etc. Discoloration is also likely to occur due to the direct influence of, and the green tea component on the surface easily disappears.

  On the other hand, in the tatami mat of Patent Document 2, since the sheet soaked with the green tea extract is covered with the tatami surface, it is not directly affected by the outside, but functions such as antibacterial properties are not effectively exhibited up to the surface of the tatami surface.

  The present invention solves the above problems, effectively demonstrates the antibacterial and deodorant properties of green tea components, and does not easily impair their functions due to external influences. An object of the present invention is to provide a cocoon sheet that can withstand and maintain for a long period of time and a method for producing the same.

  As a result of studies to solve the above problems, a protective film having air permeability is obtained by coating green tea components on the surface of the grass sheet using electrostatic coating and laminating the resin in a fine particle state by electrostatic coating. It was found that the function of the green tea component can be effectively exhibited while protecting the green tea component of the sheet, and the present invention has been completed.

According to one aspect of the present invention, a method for producing a cocoon sheet includes forming a breathable protective thin film by electrostatically coating a green tea extract on a sheet formed using cocoon grass and then electrostatically coating the resin. The gist is to do.

According to another aspect of the present invention, there is provided a method for producing a licorice sheet, wherein a green tea polyphenol is electrostatically applied to a sheet formed using licorice and then coated with a breathable protective thin film containing a resin. The gist.

  According to the present invention, an antibacterial / deodorant function of green tea components is effectively realized over a long period of time without being impaired by wiping or the like, and an antibacterial / deodorant rug or tatami mat is provided. This can contribute to improving the comfort of the living environment.

  The green tea extract contains catechins and other green tea polyphenols that exhibit antibacterial and deodorant properties, and this is applied to or impregnated on a sheet formed of plant fibers such as tatami mats woven with coconut grass. By this, antibacterial properties and deodorizing properties are imparted to the sheet. However, since the bond between the functional component (green tea polyphenol such as catechin) and licorice in such a case is weak, the functional component is easily peeled off from the sheet by dry wiping or the like on the sheet surface.

  In order to firmly fix the functional component on the sheet surface, for example, it is conceivable to mix a green tea extract with a resin or the like and apply and adhere to the sheet surface, but since the green tea extract is included by the resin, The antibacterial and deodorant functions are sealed and cannot be exhibited satisfactorily. In addition, since the coexistence state of licorice and green tea polyphenol is extremely reduced, a synergistic effect between licorice and green tea polyphenol cannot be expected. Even if the mixing ratio of the resin is decreased in order to release the inclusion by the resin, both the fixing / protection of the functional component and the performance of the function are halfway.

  In the present invention, in order to achieve both the fixing / protection of functional components and the performance of the function, the grass sheet to which the functional components are added is covered with a breathable protective thin film. It is formed by granulating and depositing on a sheet. As a result, the film-forming substances are stacked in a form leaving a gap between the deposited particles, and a porous thin film having pores is formed, thereby ensuring air permeability. The antibacterial and deodorizing properties of the functional component are exhibited to the outside through the pores of the thin film, and the thin film protection prevents the functional component from being peeled off by dry wiping and the like, and the decomposition and disappearance due to sunlight and the like are also suppressed.

  Hereinafter, the manufacturing method of the weed sheet according to the present invention and the obtained weed sheet will be described in detail.

  The green grass polyphenol function is a sheet of licorice that has been processed into a sheet shape using ligaments as a strip like a tatami table or cocoon, and can be knitted or woven. They may be arranged side by side and fixed and combined with other materials. In addition, it is not necessary for the cocoon sheet to be composed entirely of cocoon grass, and a part of the strip material such as fibers and strings manufactured using other plant fibers or synthetic polymers may be used. For example, it is possible to weave the strips made of such other materials as warps and weeds as wefts. Alternatively, plant fibers or synthetic plastics may be formed into a cocoon-like shape, and may be mixed woven in place of a part of the hay. The plant fibers that make up the strips include paper fibers such as Kozo, Mitsu or wood pulp, and fabric fibers such as cotton and hemp, as well as recycled materials such as wheat straw. It is also possible to use rice straw. As the synthetic polymer constituting the strip, various polymers including polyolefin resin such as polypropylene are allowed. Additives that exhibit antibacterial and deodorant properties and other useful functions may be blended with such strips, and examples of such additives include inorganic materials such as metal compounds and ceramics. . Also, there are no restrictions on the weaving and weaving patterns of the sheets, for example, through weaving, relay weaving, pulling weaving, mesh weaving, various weaving, Kakegawa weaving, Nagisa weaving, plain weaving, etc. A handle can be used.

A green tea polyphenol is applied to the above-described cocoon grass sheet to impart antibacterial and deodorant properties. Polyphenol has a deodorizing function, and catechin, which is a kind of polyphenol, also has antibacterial properties. Since the antibacterial and deodorizing properties of each of the coconut polyphenols and green tea polyphenols contained in the cocoon grass act synergistically, it is particularly effective to apply the green tea polyphenol to the cocoon grass sheet. The green tea polyphenol is applied using an aqueous liquid containing green tea polyphenol. Specifically, the green tea extract, the aqueous liquid obtained by adding the green tea extract to water, and the polyphenol purified product separated from the green tea extract in water are used. An aqueous liquid or the like added to can be used, and it is not necessary to exclude other components as long as the function of the green tea polyphenol is not impaired, and it may contain components other than the components of the green tea extract. By electrostatically applying such an aqueous liquid to a licorice sheet and drying, a sheet having green tea polyphenol uniformly attached to the surface can be obtained. In order to suitably exhibit antibacterial and deodorizing properties, it is appropriate that green tea polyphenols are distributed on the sheet at a ratio of 0.03 g / m ² or more and catechin is 0.02 g / m ² or more, preferably It is applied so as polyphenols 0.03~0.07g / ^{m 2,} catechins are distributed at a rate of 0.02~0.05g / ^{m 2.}

In the dry state, the average stem diameter is about 1.2 mm, and the average stem diameter is about 1.6 mm in the wet state. To do. Further, the surface is easily damaged in a wet state. Therefore, it is desirable not to impregnate the aqueous solution deeply into the inside of the plant in terms of preventing the strength reduction due to swelling / shrinkage of the raw material grass in the sheet processed using the raw material plant as it is, such as a tatami mat. In this regard, in the case where the licorice sheet is applied by immersing it in an aqueous solution, it is disadvantageous in that the strength of the culm is easily reduced due to rapid penetration from the cut surface of the licorice. In general spray application, uniform application is difficult and application efficiency is low, so it is necessary to set a large amount of application per area, and as a result, a large amount of water is supplied onto the weed grass sheet. It tends to cause a decrease in strength due to swelling. Compared with these, when applying electrostatically, the particulate aqueous liquid can be uniformly applied to the sheet, and since the application efficiency is high, the application amount per area can be set small, and as a result, the amount of moisture on the grass is also reduced. This is preferable because it can be reduced, and swelling of the weed can be suppressed. In addition, the green tea polyphenol adhesion to the sheet can be strengthened by electrostatic adsorption, and it can cope with irregularities on the surface of the grass, and the green fiber polyphenol coating ratio (yield) on the sheet fiber surface is high. It is preferable to apply by application. It has been found from experimental results that the moisture content that causes a shape change due to swelling when the grass is wet is about 18.0% by mass or more. Considering this, the conditions of electrostatic coating are examined. In order to efficiently apply green tea polyphenol, the total polyphenol is about 0.07 to 0.35% by mass, preferably 0.1 to 0.30% by mass. The total catechin is about 0.06 to 0.27% by mass, and preferably about 25 to 55 ml / m ² using an aqueous liquid having a concentration of about 0.09 to 0.21% by mass. It is preferable to apply it to a cocoon sheet in a proportion. Problems outside these ranges include insufficient coating of green tea polyphenol, reduced strength due to swollen deformation of licorice, coarsening of particles during atomization, and generation of spots when photodegraded. A suitable aqueous liquid as described above is, for example, a green tea extract aqueous solution having a concentration of about 0.2 to 0.9% by mass if prepared using a green tea extract purified product having a total polyphenol content of around 40% by mass. Become a liquid.

  In electrostatic coating, an anode is connected to a grounded grass sheet, and an electric field is generated between the two electrodes by applying a high voltage using the atomizer of the electrostatic coating machine as a negative electrode, which is atomized and charged negatively by the atomizer. The particles of the green tea polyphenol aqueous solution are moved along the electric field and attached to the grass sheet.

  The grass sheet coated with green tea polyphenol aqueous solution is dried immediately. Sheet drying is facilitated by air drying or heating. In the case of heat drying, in order to dry quickly while preventing damage to plant fibers and decomposition of functional components, the temperature is preferably about 100 to 115 ° C., and such temperature is preferably about 20 to 120 seconds, preferably By vaporizing the water in about 30 seconds, the grass sheet can be suitably dried, and the water content becomes about 10% by mass or less. As a result, a coating containing green tea polyphenol is provided on the surface of the cocoon sheet. When the drying time is less than 20 seconds, many undried portions are observed in the concave portion. When the drying time exceeds 120 seconds, the moisture content of the grass sheet becomes 3% by mass or less, which causes quality deterioration due to excessive drying of the grass. Become.

  The green tea polyphenol-attached cypress sheet covers a green tea polyphenol-containing coating by providing a porous protective thin film with air permeability, thereby protecting the green tea polyphenol from the outside. Good performance for a long time. The film-forming substance for forming the protective thin film was prepared as a liquid containing a film-forming substance by appropriately selecting one or more kinds from polymer materials such as natural resins and synthetic resins used in general paints. It is applied to the grass sheet by electrostatic painting using paint. Thereby, a particulate paint deposits on a sheet | seat and a colorless porous thin film is formed with a film-forming substance. In electrostatic coating, it is preferable to use a low-viscosity liquid from the viewpoint of work resistance in atomization. In this respect, an emulsion paint is suitable. In addition, W / O emulsion paints, O / W emulsion paints, and water-based dispersion paints whose solubility is controlled by functional components, form a porous film due to changes in solubility and film shape performance during drying. easy. Water-based paints are also advantageous in terms of the environment related to atomization of paints and evaporation of solvents during drying. Examples of film-forming substances constituting such water-based paints include thermoplastic resins such as butadiene-styrene copolymer, vinyl chloride-vinyl acetate copolymer, acrylic polymer, polyurethane, polyester, and the like. It is prepared into a paint by dispersing using a solvent or the like. From the viewpoint of film forming strength and ease of forming, a film forming material such as acrylic resin is preferred. In addition to the film forming substance and the medium, a pigment, an ultraviolet absorber, or the like may be added to the coating material as necessary.

In the same way as described above, electrostatic coating of paint is performed by connecting a positive electrode to a grounded grass sheet, applying a high voltage using the electrostatic sprayer's atomizer as the negative electrode, The charged paint is moved along the electric field to adhere to the sheet. The paint to be used is preferably an aqueous paint having a concentration of the film-forming substance of about 0.5 to 5% by mass from the porous film of the protective thin film and the fluidity of the paint in the electrostatic coating machine. By setting the coating amount per ² to about 15 to 40 ml, a porous protective thin film having a suitable thickness can be formed after drying. When the coating amount is outside the above range, problems such as peeling off of green tea polyphenol due to insufficient strength of the protective thin film, and antibacterial properties not being exhibited on the surface due to excessive thickness of the thin film occur.

  A porous protective thin film is formed by drying the weed grass sheet to which the paint has been applied. The thickness of the protective thin film is about 0.12 to 0.33 μm, and the green tea polyphenol is suitably protected, and the antibacterial and deodorizing properties are well exhibited through the protective thin film. When heated to about 100 to 120 ° C. using a drier or the like, drying can be promoted, and the paint water can be prevented from affecting the green tea polyphenols and camellia under the film. However, when the heating temperature exceeds 120 ° C., the quality of the green tea polyphenols in the grass and the lower layer deteriorates.

  In the cocoon sheet coated with green tea polyphenol and the protective thin film by the manufacturing method described above, the synergistic expression of antibacterial and deodorant properties due to the coexistence of coconut polyphenol and green tea polyphenol is suitably exhibited through the porous protective thin film, and The applied green tea polyphenol is protected by a protective thin film to prevent peeling due to external action such as dry wiping, and light resistance is also improved. Electrostatic coating is advantageous in terms of productivity and product life because it provides good yield and facilitates prevention of peeling due to improved component adhesion due to attractive force. In addition, since it is applied uniformly corresponding to the unevenness of the surface by electrostatic coating, swelling due to local overcoating and functional sealing due to excessive film thickness are prevented, so there is no deterioration in the quality of cigarettes The function of the polyphenol is suitably maintained for a long time. Moreover, since the surface shape is not limited, it can be applied to various weave and weave-patterned weed-sheets. The obtained weed-sheets can be used for flooring such as tatami mats and scorpio, mats, cloths such as cloth, and interiors. It can be widely used as a cover for decorations and accessories.

  The above manufacturing method can also be applied to sheets made using various plant fibers in addition to the cocoon sheet, such as wheat straw, rice straw, etc., papermaking raw materials such as Kozo, Mitsu or wood. In addition to pulp and other fabric materials such as cotton and hemp plants, Japanese paper, and these recycled materials, sheets formed using polyolefin and the like can be mentioned. In this case, the antibacterial and deodorant properties are those of green tea polyphenol alone. Moreover, if the synergistic effect of a camellia polyphenol and a green tea polyphenol is anticipated, it is also possible to mix both and obtain a sheet by the manufacturing method described above. The raw material plant may be processed into a sheet shape using the raw material plant as a strip material in the form as it is like a camellia sheet, or the plant fiber taken out from the raw material plant may be processed into a sheet shape. The raw material plant itself or a thread-like yarn made by twisting plant fibers, a cloth-like material knitted or woven, or a non-woven fabric, paper, etc. formed from a plant fiber into a sheet by papermaking or fixing Also good.

  Hereinafter, the present invention will be described in detail with reference to examples. The present invention is not limited in any way by these examples.

<Creation of Reed Sheet>
Weave the weeds into a pull weave and cut and remove the beard (the part that protrudes at both ends of the sheet when weaving the weeds sheet, the part that is not sewn) and remove the sheet of 30cm x 20cm (inner mustache part 8cm) Created.

<Preparation of base catechin solution>
In addition to water to green tea catechin extract (total polyphenol: 38% by mass, total catechin: 30% by mass [EGC: 10% by mass, EGCg: 14% by mass, EC: 2% by mass, ECg: 4% by mass]), A catechin solution having a green tea catechin extract concentration of 0.1 to 3.0% by mass was prepared.

<Preparation of paint for upper ground>
Colorless paint resin (acrylic emulsion manufactured by Kansai Paint Co., Ltd., composition: acrylic resin 90% by mass; auxiliary agent (ethylene glycol dibutyl phthalate) 6% by mass; water 4% by mass, trade name: HSS No. 1 Clear, Article No .: 17-249-011) A coating material was prepared by adding 100 L of water to 1 kg and diluting to a concentration of about 1% by mass.

<Samples A1 to A7, Z1 to Z10>
Using an electrostatic coating device (Landsburg), catechin solution was electrostatically applied to the licorice sheet at the concentration and coating amount shown in Table 1, and then heated and dried at the drying temperature shown in Table 1 for 30 seconds to produce green tea. A sheet of catechin extract was applied to the sheet. Next, the coating is electrostatically applied to the sheet with the coating amount described in Table 1 using the electrostatic coating apparatus described above, and the top coating is applied by heating to the drying temperature in Table 1 and drying for 30 seconds, Sheets of samples A1 to A7 and Z1 to Z10 were obtained.

<Sample Z11>
The catechin solution having a green tea catechin extract concentration of 0.3% by mass was dipped in about 1 m of coconut grass, impregnated for 5 minutes, pulled up, and dried by heating at 100 ° C. for 30 seconds.

<Sample Z12>
The green tea catechin extract was coated with a green tea catechin extract by dipping the coconut sheet in a catechin solution having a concentration of 0.3% by mass, impregnating for 30 seconds and then lifting and drying by heating at 100 ° C. for 30 seconds. .

<Samples Z13 to 15>
The green tea catechin extract and the paint are mixed so that the concentration of the green tea catechin extract becomes the concentration shown in Table 2, and this mixed solution is electrostatically applied to the camellia sheet with the application amount shown in Table 2 using the electrostatic application device described above. The sheet | seat of sample Z13-Z15 was obtained by apply | coating, heating to the heating temperature of Table 2, and drying for 30 seconds.

<Evaluation of sheet>
About the sheet | seat obtained above, according to the following, the yield, the intensity | strength after drying, component effectiveness, component peelability, light resistance, antibacterial property, and deodorizing property were evaluated. The results are shown in Tables 3 and 4.

(Yield)
The sheet was disassembled to separate the grass and the surface of the grass was visually observed. The surface of the grass that was not damaged and was sufficiently coated and had no discoloration (black change) was accepted, and the number of the passed grass was examined. In the case of sample Z11, observation was made on the weeds before weaving into a sheet, and the number of accepted weeds was examined. The yield (%) of the passed licorice was calculated according to the following formula, and the yield was evaluated with ○ when the yield was 90% or more and x when it was less than 90%.

Yield = 100 × (number of passed licorice) / (total number of licorice)
The samples Z11 and Z12 are only evaluated for yield, and the following evaluation is not performed.

(Strength after drying)
The mass of the grass sheet before and after coating and drying was measured, and the mass retention rate at which the mass was maintained against the detachment of the mustache was calculated by the following equation. When this value was 95% or more, the strength after drying was evaluated with ◯ and the case of less than 95% with ×.
means.

Mass retention rate (%) = Weight of dried grass rug after drying (g) ÷ Weight of dried grass rug before drying (g)
(Ingredient effectiveness)
Using the fact that polyphenol reacts with iron ions and turns black, 3 ml of an aqueous solution containing iron ions is dropped onto the sheet coated with the top coating, and the presence or absence of black change on the sheet surface is examined. The effectiveness of the components was evaluated by ◯ for some cases and x for no change. In addition, it confirmed that there was no reaction with respect to an iron ion aqueous solution in an unprocessed weed grass sheet.

(Component peelability)
After the surface of the coated sheet was dry wiped 30 times with a white cloth, 3 ml of an aqueous solution containing iron ions was dropped on the sheet, and the presence or absence of black change due to the reaction between polyphenol and iron ions was examined. . Further, 3 ml of an aqueous solution containing iron ions was dropped onto the white cloth after dry wiping to examine the presence or absence of a black change. The component peelability was evaluated by assuming that the sheet surface had a black color change and the white cloth had no black color change, and the sheet surface had no black color change and the white cloth had a black color change. In addition, (triangle | delta) shows the case where black change is not recognized by any of the sheet | seat surface and a white cloth.

(Light resistance)
A fade meter was used to irradiate the top-coated sheet with light for 50 hours under the conditions of 60% humidity and 40 ° C., and the change in the sheet surface at the time of 25 hours and 50 hours of light irradiation was examined. A case where no change is observed at any time point, a case where no change is observed at a time point of 25 hours, and a spot-like stain is seen at a time point of 50 hours, and a case of a spot-like stain is seen at a time point of 25 hours. The light resistance was evaluated with x as the case.

(Antibacterial)
Since the grass sheet had irregularities on the surface and there were obstacles in performing the antibacterial test, the following substitution test was performed.

  A filter paper cut to 5 cm × 5 cm was impregnated with 1 ml of a licorice extract (50 g of dried licorice in 1 L of boiling water, stirred for 30 minutes and then filtered), dried at 105 ° C. for 3 hours, Samples for antibacterial tests obtained by electrostatic coating of catechin liquid and paint under the coating and drying conditions of Samples A1-7, Z1-10, and Z13-15 shown in Tables 1 and 2 were applied to the base and top coating. It was. After immersing the sample in 1/500 ordinary bouillon, measure the viable cell count (CFU / plate) of the bacterial solution (MRSA: methicillin-resistant Staphylococcus aureus) on the sample using the film adhesion method of the Antibacterial Product Technology Council did.

  On the other hand, for the evaluation criteria, filter paper having the same dimensions as above was impregnated with 1 ml of the above-mentioned extract of licorice and dried, and filter paper was impregnated with 1 ml of catechin liquid having a green tea catechin extract concentration of 0.3% by mass. Similarly, after the sample was dried and immersed in 1/500 normal broth, the viable count (CFU / sheet) of the bacterial solution on the sample was measured.

The viable cell count of the sample in the case of the licorice extract is 1.0 × 10 ⁵ (0 hour), 3.4 × 10 ⁴ (after 24 hours), and the case of the catechin solution is 1.0 × 10 ⁵ (0 time), considering that was 1.1 × ¹⁰ 4 (after 24 hours), ○ a case where the number of viable bacteria after 24 hours is less than ^{1.0 × 10 4, 1.0 × 10} 4 The antibacterial property in each sample was evaluated as x in the above case.

(Deodorant)
The sheet after the top coating was cut to 20 mm × 30 mm, and the back surface and the fore edge of the sheet were covered with a plastic film so that the exposed area of the coating ground was 10 mm × 20 mm. Using this as a test sample, after putting it in a Tedlar bag filled with 3 L of air containing malodorous substances (ammonia 160 ppm, formaldehyde 70 ppm) and storing at 37 ° C. for 3 hours, each gas in the air using a gas detection tube manufactured by GASTECH The residual amount of malodorous substances (ammonia, formaldehyde) was measured, and the deodorization rate was calculated from the initial concentration of each malodorous substance and the concentration after 3 hours according to the following formula.

Deodorization rate (%) = 100 × (initial concentration−concentration after 3 hours) / initial concentration For ammonia, the deodorization rate is defined as ○ when the above deodorization rate exceeds 90%, and x when it is 90% or less. evaluated. With respect to formaldehyde, the deodorizing property was evaluated by ◯ when the deodorizing rate exceeded 86% and x when the deodorizing rate was 86% or less.

歩留りについて、静電塗布を用いずにカテキン液に藺草又は藺草シートを浸漬したＺ１１，１２は、下地塗装の歩留りが低く、藺草の損傷が目立った。このため、これらの試料では上地塗装及び他の評価試験を行わなかった。

Regarding the yield, Z11,12 in which the cocoon or the sheet was immersed in the catechin solution without using electrostatic coating had a low base coating yield, and the damage of the cocoon was conspicuous. For this reason, the top coating and other evaluation tests were not performed on these samples.

  Regarding the strength after drying, the weight loss of samples Z5 and 6 in which the drying temperature of the base coating was 120 ° C. or higher was large, and the material strength was clearly decreased. For this reason, it was considered that the product value was low, and other evaluation tests were not performed on these samples.

  Regarding the effectiveness of the components, the samples Z1 and Z2 having a small catechin solution concentration or coating amount show no catechin reaction, indicating that the amount of the base coating is insufficient. In addition, the reaction of catechin is not observed even in the sample Z10 having a large amount of coating on the top. This is considered that the base does not react with the iron ion solution because the thickness of the upper coating is excessive. In addition, in the samples Z13 and 14 in which the catechin extract and the above-ground paint are mixed, the reaction of the catechin is not observed because the catechin extract is encased in the paint resin and thus does not exert its function on the painted surface. I think that the. About these, the reaction of catechin is not seen also in evaluation of component peelability, and evaluation also becomes low about antibacterial property and deodorizing property. On the other hand, the reaction of catechin is observed in sample Z15 because the amount of catechin during coating is large.

  Regarding the component peelability, in samples Z7 to 9 where the coating amount of the upper coating is small, the reaction of catechin is seen in the white cloth after dry wiping, and it is clear that the peeling is due to insufficient thickness of the upper coating. For this reason, evaluation of light resistance, antibacterial properties, and deodorizing properties was omitted for these samples.

  As for the light resistance, spotted spots occur in the samples Z3 and 4 having a large amount of catechin in the base coating. From this, it can be said that in order to maintain the product value for a long time, it is preferable to adjust the amount of catechin of the base within a range in which functions such as antibacterial properties and deodorizing properties are suitably exhibited. Further, it can be seen that it is difficult to ensure both the function of the catechin extract and the light resistance in the sample Z15 in which the catechin extract and the paint are mixed and applied. About these, since utility was low from a viewpoint of commercial value, evaluation of antibacterial property and deodorant property was omitted.

  Regarding the antibacterial and deodorant properties, the low evaluation of the samples Z1 and Z2 having a small catechin solution concentration or coating amount indicates that these functions are strongly exerted as the catechin amount increases.

  Regarding the deodorization rate of formaldehyde, 1 ml of a 1% by weight aqueous solution of green tea catechin extract was impregnated into a filter paper of 50 mm × 50 mm and measured at a temperature of 105 ° C. for 3 hours as a sample. The deodorization rate was 89%. . Comparing this result with the samples A1 to A7, it is clear that the sample applied to the camellia sheet can obtain the deodorizing effect of formaldehyde even at a low concentration or a low application amount. From this, it can be inferred that a synergistic effect is caused by the combination of camellia and catechin. Similar results to the filter paper were obtained for the formaldehyde deodorization rate when a sample of Japanese paper was used instead of cocoon.

In addition, the viable cell count of the filter paper sample impregnated with 1 ml (1 ml / 25 cm ² = 400 ml / m ² ) of 0.3 mass% green tea catechin extract aqueous solution is 1.1 × 10 ⁴ , The number of viable bacteria is 3.4 × 10 ⁴ , sample A1 (underground electrostatic coating amount: 25 ml / m ² ), and the number of viable bacteria is 5.4 × 10 ³ , sample A2 (underground electrostatic coating amount: 25 ml / m ^2). ) Is 4.2 × 10 ³ , it is clear that even if the amount of green tea catechin extract is 1/16, the antibacterial activity is increased by the coexistence of the camellia extract.

Claims (8)

  A method for producing a cocoon sheet, comprising forming a breathable protective thin film by electrostatically coating a resin after electrostatically applying a green tea extract to a sheet formed using cocoon grass.   The said green tea extract contains green tea polyphenol, The manufacturing method of the camellia sheet | seat of Claim 1 apply | coated electrostatically with the form of aqueous liquid. The aqueous solution, the concentration of green tea polyphenol is from 0.07 to 0.35 wt%, the production method of the rush sheet of claim 2, wherein the coating on said sheet at a rate of 25~55ml / ^{m 2.}   The said resin is colorless, The manufacturing method of the weed-sheet according to any one of claims 1 to 3 which is electrostatically coated in the form of an aqueous emulsion liquid. The method for producing a weed grass sheet according to claim 4, wherein the aqueous emulsion liquid has a concentration of the resin of 0.5 to 5.0% by mass and is applied to the sheet at a rate of 15 to 45 ml / m ² .   The said sheet | seat is a manufacturing method of the camellia sheet | seat in any one of Claims 1-5 formed using a weave as a weft, and using a strip formed using Japanese paper or polyolefin as a warp.   The said green tea extract electrostatically apply | coated to the said sheet | seat and the said resin are the manufacturing methods of the camellia sheet | seat in any one of Claims 2-5 each heat-dried at 100-115 degreeC after electrostatic application.   A method for producing a cocoon sheet comprising applying a green tea polyphenol electrostatically to a sheet formed using cocoon grass and then covering the sheet with a breathable protective thin film containing a resin.