JP6621125B1 - Granulated powder tea leaves and method for producing the same - Google Patents
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Abstract
【課題】分散性に優れた造粒茶葉を提供すること。【解決手段】平均粒子径が１００μｍ以上であり、嵩比重が０．４ｇ／ｍｌ以下である造粒粉末茶葉。【選択図】なしA granulated tea leaf having excellent dispersibility is provided. A granulated powdered tea leaf having an average particle size of 100 μm or more and a bulk specific gravity of 0.4 g / ml or less. [Selection diagram] None
Description
造粒粉末茶葉に関する技術が開示される。 Techniques relating to granulated powdered tea leaves are disclosed.
特許文献１には、風味と溶解性とをバランスよく両立し、かつ粒子の均一性に優れる粉末茶組成物を安定的に製造する方法として、熱風温度と水性媒体の噴霧速度等を制御する方法が開示されている。特許文献２には、水に対する分散性に優れた、粉末茶葉を９０質量％以上含有し、且つ平均粒子径が８０〜１８０μｍである造粒茶葉が開示されている。特許文献３には、分散、懸濁性に優れた粉末茶として、平均粒子径が１０〜３０ミクロンの造粒された粉末茶が開示されている。特許文献４には、特許文献４には、分散性に優れた茶葉顆粒として安息角が４５度未満の茶葉顆粒が開示されている。特許文献５には、溶解性が向上した粉砕茶の製造方法として、茶葉に別の茶葉の抽出液のコーティング層を形成する方法が開示されている。しかし、これらの文献に開示される造粒茶葉は、分散安定性などの点で更なる改善の余地がある。 Patent Document 1 discloses a method for controlling the hot air temperature and the spray rate of an aqueous medium as a method for stably producing a powdered tea composition having a good balance between flavor and solubility and excellent particle uniformity. Is disclosed. Patent Document 2 discloses a granulated tea leaf having 90% by mass or more of powdered tea leaf having excellent water dispersibility and an average particle size of 80 to 180 μm. Patent Document 3 discloses a granulated powder tea having an average particle size of 10 to 30 microns as a powder tea excellent in dispersion and suspension. Patent Document 4 discloses a tea leaf granule having an angle of repose of less than 45 degrees as a tea leaf granule excellent in dispersibility. Patent Document 5 discloses a method of forming a coating layer of another tea leaf extract on tea leaves as a method for producing ground tea with improved solubility. However, the granulated tea leaves disclosed in these documents have room for further improvement in terms of dispersion stability.
分散性に優れた造粒茶葉を提供することが１つの課題である。 One problem is to provide granulated tea leaves with excellent dispersibility.
斯かる課題を解決すべく研究を重ねた結果、粒子径と嵩比重を制御することによって課題の解決が可能であることを見出した。斯かる知見に更なる検討を重ねたことにより、下記に代表される発明が提供される。
項１
平均粒子径が１００μｍ以上であり、嵩比重が０．４ｇ／ｍｌ以下である造粒粉末茶葉。
項２
平均粒子径が４００μｍ以下である、項１に記載の造粒粉末茶葉。
項３
嵩比重が０．２ｇ／ｍｌ以上である、項１又は２に記載の造粒粉末茶葉。
項４
粉末茶葉を８０質量％以上含有する、項１〜３のいずれかに記載の造粒粉末茶葉。
項５
粉末茶葉が緑茶粉末茶葉である、項１〜４のいずれかに記載の造粒粉末茶葉。
項６
粉末茶葉を流動層造粒に供することを含む、項１〜５のいずれかに記載の造粒粉末茶葉の製造方法。
As a result of repeated studies to solve such problems, it has been found that the problems can be solved by controlling the particle diameter and bulk specific gravity. By further studying such knowledge, the inventions represented below are provided.
Item 1
A granulated powder tea leaf having an average particle diameter of 100 μm or more and a bulk specific gravity of 0.4 g / ml or less.
Item 2
Item 2. The granulated powder tea leaves according to Item 1, wherein the average particle size is 400 µm or less.
Item 3
Item 3. The granulated powder tea leaf according to Item 1 or 2, wherein the bulk specific gravity is 0.2 g / ml or more.
Item 4
Item 4. The granulated powdered tea leaf according to any one of Items 1 to 3, comprising 80% by mass or more of powdered tea leaf.
Item 5
Item 5. The granulated powder tea leaf according to any one of Items 1 to 4, wherein the powder tea leaf is a green tea powder tea leaf.
Item 6
Item 6. The method for producing granulated powdered tea leaves according to any one of Items 1 to 5, comprising subjecting the powdered tea leaves to fluidized bed granulation.
分散性に優れた造粒粉末茶葉が提供される。 A granulated powder tea leaf having excellent dispersibility is provided.
造粒粉末茶葉は、平均粒子径が１００μｍ以上であることが良好な分散性を有するという観点で好ましい。平均粒子径は、後述する実施例の項に記載された湿式の手法によって測定される。分散性は、造粒粉末茶葉の水（又は湯）への分散し易さを表す用語として使用され、例えば、実施例に記載された方法で評価される。 The granulated powder tea leaves preferably have an average particle size of 100 μm or more from the viewpoint of good dispersibility. The average particle size is measured by a wet method described in the Examples section described later. Dispersibility is used as a term indicating the ease of dispersion of granulated powdered tea leaves into water (or hot water), and is evaluated, for example, by the method described in the Examples.
一実施形態において、造粒粉末茶葉の平均粒子径は、１２５μｍ以上、１５０μｍ以上、１７５μｍ以上、１９０μｍ以上、２００μｍ以上、２２５μｍ以上、２５０μｍ以上、又は３００μｍ以上であることが好ましい。一実施形態において、平均粒子径は、４００μｍ以下であることが好ましく、３７５μｍ以下、３５０μｍ以下、３２５μｍ以下、３００μｍ以下、２７５μｍ以下、２５０μｍ以下、２２５μｍ以下、又は２００μｍ以下が好ましい。これらの平均粒子径の下限値及び上限値は任意に組み合わせることができる。例えば、一実施形態において、平均粒子径は、１９０μｍ以上４００μｍ以下、１２５μｍ以上３７５μｍ以下、１２５μｍ以上３５０μｍ以下、１２５μｍ以上３２５μｍ以下、又は１２５μｍ以上３００μｍ以下が好ましい。 In one embodiment, the average particle size of the granulated powder tea leaves is preferably 125 μm or more, 150 μm or more, 175 μm or more, 190 μm or more, 200 μm or more, 225 μm or more, 250 μm or more, or 300 μm or more. In one embodiment, the average particle size is preferably 400 μm or less, preferably 375 μm or less, 350 μm or less, 325 μm or less, 300 μm or less, 275 μm or less, 250 μm or less, 225 μm or less, or 200 μm or less. These lower limit and upper limit of the average particle diameter can be arbitrarily combined. For example, in one embodiment, the average particle diameter is preferably 190 μm to 400 μm, 125 μm to 375 μm, 125 μm to 350 μm, 125 μm to 325 μm, or 125 μm to 300 μm.
造粒粉末茶葉は、嵩比重が０．４ｇ／ｍｌ以下であることが良好な分散安定性を有するという観点から好ましい。嵩比重は後述する実施例の項に記載された手法によって測定される。分散安定性に優れる造粒粉末茶葉は、水に分散した状態を長期間維持することができ、分散後に粉末茶葉粒子が沈殿ないし堆積することを遅らせること、及び／又は沈殿ないし堆積する粉末茶葉粒子の量を低減することができる。分散安定性は、例えば、後述する実施例の項に記載された手法によって評価できる。 The granulated powder tea leaves preferably have a bulk specific gravity of 0.4 g / ml or less from the viewpoint of good dispersion stability. The bulk specific gravity is measured by the method described in the section of Examples described later. Granulated powder tea leaves having excellent dispersion stability can maintain a state of being dispersed in water for a long period of time, and delay the precipitation or deposition of powdered tea leaf particles after dispersion and / or powder tea leaf particles that precipitate or accumulate. The amount of can be reduced. The dispersion stability can be evaluated by, for example, the technique described in the Examples section described later.
造粒粉末茶葉の嵩比重の下限は、特に制限されないが、例えば、０．２ｇ／ｍｌとすることができる。一実施形態において、嵩比重は、０．３８ｇ／ｍｌ以下、０．３６ｇ／ｍｌ以下、０．３４ｇ／ｍｌ以下、０．３２ｇ／ｍｌ以下、又は０．３ｇ／ｍｌ以下であることが好ましい。一実施形態において、嵩比重は、０．２２ｇ／ｍｌ以上、０．２４ｇ／ｍｌ以上、０．２６ｇ／ｍｌ以上、０．２７ｇ／ｍｌ、０．２８ｇ／ｍｌ以上、０．３ｇ／ｍｌ以上、０．３２ｇ／ｍｌ以上、又は０．３４ｇ／ｍｌ以上であることが好ましい。これらの嵩比重の上限値及び下限値は任意に組み合わせることができる。例えば、一実施形態において、嵩比重は、０．２７ｇ／ｍｌ以上０．４ｇ／ｍｌ以下、０．２７ｇ／ｍｌ以上０．３８ｇ／ｍｌ以下、０．２７ｇ／ｍｌ以上０．３６ｇ／ｍｌ以下、又は０．２７ｇ／ｍｌ以上０．３４ｇ／ｍｌ以下が好ましい。一実施形態において、嵩比重が低いと水への分散性が低下し、特に造粒粉末茶葉の平均粒子径が小さい場合にその傾向は顕著である。平均粒子径が小さく、嵩比重が低い造粒粉末茶葉は、水に十分分散せず、水面に浮かぶ傾向がある。よって、例えば、造粒粉末茶葉の平均粒子径が１２０μｍ未満又は１１５μｍ未満である場合、嵩比重は、０．２７ｇ／ｍｌ以上、０．２８ｇ／ｍｌ以上、０．３ｇ／ｍｌ以上、０．３２ｇ／ｍｌ以上、又は０．３４ｇ／ｍｌ以上であることが好ましい。 The lower limit of the bulk specific gravity of the granulated powdered tea leaves is not particularly limited, but can be, for example, 0.2 g / ml. In one embodiment, the bulk specific gravity is preferably 0.38 g / ml or less, 0.36 g / ml or less, 0.34 g / ml or less, 0.32 g / ml or less, or 0.3 g / ml or less. In one embodiment, the bulk specific gravity is 0.22 g / ml or more, 0.24 g / ml or more, 0.26 g / ml or more, 0.27 g / ml, 0.28 g / ml or more, 0.3 g / ml or more, It is preferably 0.32 g / ml or more, or 0.34 g / ml or more. These upper and lower limits of bulk specific gravity can be arbitrarily combined. For example, in one embodiment, the bulk specific gravity is 0.27 g / ml to 0.4 g / ml, 0.27 g / ml to 0.38 g / ml, 0.27 g / ml to 0.36 g / ml, Or 0.27 g / ml or more and 0.34 g / ml or less are preferable. In one embodiment, when the bulk specific gravity is low, the dispersibility in water is lowered, and this tendency is remarkable particularly when the average particle diameter of the granulated powder tea leaves is small. Granulated powder tea leaves with a small average particle size and low bulk specific gravity are not sufficiently dispersed in water and tend to float on the water surface. Therefore, for example, when the average particle size of the granulated powder tea leaves is less than 120 μm or less than 115 μm, the bulk specific gravity is 0.27 g / ml or more, 0.28 g / ml or more, 0.3 g / ml or more, 0.32 g. / Ml or more, or 0.34 g / ml or more is preferable.
上述の好ましい平均粒子径の値又は範囲と好ましい嵩比重の値又は範囲は任意に組み合わせることができる。 The preferred average particle diameter value or range described above and the preferred bulk specific gravity value or range can be arbitrarily combined.
造粒粉末茶葉を構成する粉末茶葉の種類は特に制限されないが、緑茶の茶葉であることが好ましい。緑茶とは、摘み取った茶葉を加熱して酸化酵素を破壊し、乾燥した、発酵されていない茶である。緑茶は、加工方法や栽培方法の違いにより、玉露、かぶせ茶、煎茶、番茶、碾茶、抹茶、玉緑茶、ほうじ茶、及び釜炒り茶等に分類される。一実施形態において、造粒粉末茶葉は、これらの一種又は２種以上を原料とすることが好ましい。一実施形態において、原料として好ましい緑茶は、抹茶である。一実施形態において、水分を除き、造粒粉末茶葉は抹茶のみで構成されていることが好ましい。 The type of the powdered tea leaves constituting the granulated powdered tea leaves is not particularly limited, but is preferably a green tea tea leaf. Green tea is unfermented tea that is dried and dried by heating the picked tea leaves to destroy the oxidase. Green tea is classified into gyokuro, kabuse tea, sencha, bancha, strawberry tea, matcha tea, tama green tea, roasted tea, and kettle roasted tea according to differences in processing methods and cultivation methods. In one embodiment, the granulated powdered tea leaves are preferably made from one or more of these raw materials. In one embodiment, the preferred green tea as a raw material is matcha. In one embodiment, it is preferable that the granulated powder tea leaves are composed only of matcha tea, excluding moisture.
造粒粉末茶葉の原料として用いられる粉末茶葉の平均粒子径は、特に制限されず、例えば、４５μｍ以下であることが好ましい。一実施形態において、粉末茶葉の平均粒子径は、４０μｍ以下、３５μｍ以下、又は３０μｍ以下であることが好ましく、３μｍ以上又は５μｍ以上であることが好ましい。原料として用いる粉末茶葉の平均粒子径の下限は特に制限されないが、例えば、１μｍ以上とすることができる。粉末茶葉の平均粒子径は、後述する実施例の項に記載された湿式の手法によって測定することができる。 The average particle size of the powdered tea leaves used as a raw material for the granulated powdered tea leaves is not particularly limited, and is preferably 45 μm or less, for example. In one embodiment, the average particle size of the powdered tea leaves is preferably 40 μm or less, 35 μm or less, or 30 μm or less, and preferably 3 μm or more or 5 μm or more. The lower limit of the average particle size of the powdered tea leaves used as the raw material is not particularly limited, but can be, for example, 1 μm or more. The average particle size of the powdered tea leaves can be measured by a wet technique described in the Examples section described later.
造粒粉末茶葉の原料として用いられる粉末茶葉の水分含量は特に制限されないが、例えば、６重量％以下であることが好ましい。粉末茶葉の水分含量は、後述する実施例の項に記載された手法によって測定することができる。 The water content of the powdered tea leaves used as a raw material for the granulated powdered tea leaves is not particularly limited, but is preferably, for example, 6% by weight or less. The water content of the powdered tea leaves can be measured by the technique described in the Examples section described later.
造粒粉末茶葉の原料として用いる粉末茶葉は、商業的に入手することが可能であり、公知の手法を用いて作製することも可能である。 The powdered tea leaves used as a raw material for the granulated powdered tea leaves can be obtained commercially, and can also be produced using a known method.
一実施形態において、造粒粉末茶葉は、実質的に粉末茶葉のみで構成されていることが好ましい。具体的には、造粒粉末茶葉は、粉末茶葉を８０質量％以上、８５質量％以上、９０質量％以上、９５質量％以上、９６質量％以上、９７質量％以上、９８質量％以上、９９質量％以上、又は１００質量％含むことが好ましい。造粒粉末茶葉における粉末茶葉の含有量は、乾燥工程を経た造粒粉末茶葉中に不可避的に残存している水の量を除いて算出される。一実施形態において、造粒粉末茶葉は、実質的に粉末茶葉のみで構成されながら、分散性及び分散安定性に優れている。 In one embodiment, it is preferable that the granulated powder tea leaves are substantially composed only of powder tea leaves. Specifically, the granulated powdered tea leaves are 80% by weight or more, 85% by weight or more, 90% by weight or more, 95% by weight or more, 96% by weight or more, 97% by weight or more, 98% by weight or more, 99% by weight, or 99% by weight. It is preferable to contain at least 100% by mass or 100% by mass. The content of the powdered tea leaves in the granulated powdered tea leaves is calculated by excluding the amount of water that inevitably remains in the granulated powdered tea leaves after the drying process. In one embodiment, the granulated powdered tea leaves are excellent in dispersibility and dispersion stability while being substantially composed only of powdered tea leaves.
一実施形態において、造粒粉末茶葉は、粉末茶葉及び水以外の他の成分を含んでいてもよく、含んでいなくてもよい。他の成分としては、例えば、茶抽出物、賦形剤、添加剤等を挙げることができる。一実施形態において、造粒粉末茶葉は他の成分を含まないことが好ましい。一実施形態において、造粒粉末茶葉が茶抽出物を含む場合、茶抽出物の含量は、２０質量％以下、１５質量％以下、１０質量％以下、５質量％以下、３質量％以下、２質量％以下、又は１質量％以下であることが好ましい。 In one embodiment, the granulated powdered tea leaf may or may not contain other components other than the powdered tea leaf and water. Examples of other components include tea extract, excipients, additives and the like. In one embodiment, the granulated powder tea leaves preferably do not contain other ingredients. In one embodiment, when the granulated powder tea leaves contain a tea extract, the content of the tea extract is 20% by mass or less, 15% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, 2 It is preferable that it is 1 mass% or less, or 1 mass% or less.
賦形剤の種類は特に制限されず、例えば、糖類（果糖、ブドウ糖、ソルビトール、キシリトール、エリスリトール、マンニトール、マルチトール、ラクチトール、タガトース、アラビノース等）、増粘多糖類（ペクチン、グァーガム、キサンタンガム、カラギーナン、ローカストビーンガム等）、でん粉、及びでん粉分解物（例えば、デキストリン、マルトデキストリン、サイクロデキストリン等）などを挙げることができる。賦形剤は、１種のみを用いてもよく、２種以上を組み合わせて使用してもよい。一実施形態において、好ましい賦形剤は、デキストリンである。造粒粉末茶葉が賦形剤を含有する場合、その含有量は５質量％未満、４質量％未満、３質量％未満、２質量％未満、１質量％未満、又は０．５質量％未満であることが好ましい。 The type of excipient is not particularly limited. For example, sugar (fructose, glucose, sorbitol, xylitol, erythritol, mannitol, maltitol, lactitol, tagatose, arabinose, etc.), thickening polysaccharide (pectin, guar gum, xanthan gum, carrageenan) , Locust bean gum, etc.), starch, and starch degradation products (eg, dextrin, maltodextrin, cyclodextrin, etc.). Only one type of excipient may be used, or two or more types may be used in combination. In one embodiment, the preferred excipient is dextrin. When the granulated powder tea leaves contain excipients, the content is less than 5% by weight, less than 4% by weight, less than 3% by weight, less than 2% by weight, less than 1% by weight, or less than 0.5% by weight. Preferably there is.
添加剤としては、例えば、酸化防止剤、香料、色素、保存料、調味料、アミノ酸、たんぱく質、植物油脂、有機酸、無機塩、ｐＨ調整剤、及び品質安定剤等を挙げることができる。これらは１種のみを用いてもよく、２種以上を組み合わせて使用してもよい。 Examples of the additive include an antioxidant, a fragrance, a pigment, a preservative, a seasoning, an amino acid, a protein, a vegetable oil, an organic acid, an inorganic salt, a pH adjuster, and a quality stabilizer. These may use only 1 type and may use it in combination of 2 or more type.
一実施形態において、造粒粉末茶葉は、上述の賦形剤及び／又は添加剤を含んでいないことが好ましい。賦形剤及び／又は添加剤を含んでいないとは、これらの含有量が検出限界量未満であることを意味する。 In one embodiment, the granulated powder tea leaves preferably do not contain the excipients and / or additives described above. The fact that no excipients and / or additives are contained means that their content is less than the detection limit.
造粒粉末茶葉は、粉末茶葉並びに必要に応じて用いられる賦形剤及び／又は添加剤を用いて、任意の造粒方法で製造することができるが、所望の平均粒子径及び嵩比重を有するように調整し易いという観点で流動層造粒法を用いて製造することが好ましい。 Granulated powdered tea leaves can be produced by any granulation method using powdered tea leaves and excipients and / or additives used as necessary, but have a desired average particle size and bulk specific gravity. Thus, it is preferable to produce using a fluidized bed granulation method from the viewpoint of easy adjustment.
流動層造粒法で造粒粉末茶葉を製造する場合、市場で入手可能な任意の流動層造粒装置を用い、各種パラメータを設定することにより製造することができる。 When producing granulated powdered tea leaves by the fluidized bed granulation method, it can be produced by setting various parameters using any fluidized bed granulator available on the market.
原料として用いる粉末茶葉の量は、目的や使用する装置のスケールに応じて適宜設定することができる。 The amount of the powdered tea leaves used as the raw material can be appropriately set according to the purpose and the scale of the apparatus used.
一実施形態において、装置への給気温度は、所望の造粒粉末茶葉が得られる限り特に制限されない。例えば、良好な分散安定性を有する造粒粉末茶葉を得るためには、給気温度は４５度以上１０５度以下が好ましく、５０度以上１００度以下、又は６０度以上９０度以下がより好ましい。給気温度がこの範囲よりも著しく低いと、粒子がダマ状となり、分散安定性を低下させる場合がある。給気温度は、造粒中に変化させることができる。一実施形態において、給気温度は造粒中に一定であることが好ましく、例えば、６０度以上１００度以下が好ましく、７０度以上９０度以下であることが好ましい。一実施形態において、給気温度は、造粒中に変化させることが好ましく、例えば、比較的低い温度（例えば、４５度以上６０度以下）で造粒を開始し、途中で比較的高い温度（例えば、８０度以上１００度以下）に変更することが好ましい。 In one embodiment, the supply air temperature to the apparatus is not particularly limited as long as the desired granulated powdered tea leaves are obtained. For example, in order to obtain a granulated powder tea leaf having good dispersion stability, the air supply temperature is preferably 45 ° C. or more and 105 ° C. or less, more preferably 50 ° C. or more and 100 ° C. or less, or 60 ° C. or more and 90 ° C. or less. If the supply air temperature is significantly lower than this range, the particles become lumpy and the dispersion stability may be lowered. The supply air temperature can be changed during granulation. In one embodiment, the supply air temperature is preferably constant during granulation, for example, preferably 60 degrees to 100 degrees, and more preferably 70 degrees to 90 degrees. In one embodiment, the supply air temperature is preferably changed during granulation. For example, granulation is started at a relatively low temperature (for example, 45 degrees or more and 60 degrees or less), and a relatively high temperature ( For example, it is preferable to change to 80 degrees or more and 100 degrees or less.
装置への給気速度は、粉末茶葉の流動状態、水分上昇率、及び最終水分量等のバランスを考慮して適宜設定することができる。粒子径が大きくなるに従い、粒子は流動し難くなるため、風速を上げることが好ましい。一方、未造粒の粉末茶（微粒子）の場合は、茶葉が舞いやすく、速い速度で給気すると排風フィルターが詰まりやすくなる。よって、必要に応じて、給気速度を調節しながら造粒することが好ましい。 The air supply speed to the apparatus can be appropriately set in consideration of the balance of the flow state of the powdered tea leaves, the water increase rate, the final water content and the like. As the particle diameter increases, the particles are less likely to flow. On the other hand, in the case of non-granulated powdered tea (fine particles), the tea leaves are likely to fly, and if the air is supplied at a high speed, the exhaust filter is likely to be clogged. Therefore, it is preferable to perform granulation while adjusting the air supply speed as necessary.
バインダー液は、水または水に粉末茶葉及び／又は茶抽出物を分散／溶解させたものを用いることが好ましい。一実施形態において、バインダー液の温度は、常温（例えば、５度以上３５度以下、又は１５度以上３０度以下）が好ましく、加熱していないものが好ましい。加熱していないバインダー液は、粉末茶葉（特に、バインダーに分散させる粉末茶葉）の品質を良好に維持する観点で好ましい。 The binder liquid is preferably water or water in which powdered tea leaves and / or tea extract are dispersed / dissolved. In one embodiment, the temperature of the binder liquid is preferably room temperature (for example, 5 degrees to 35 degrees or 15 degrees to 30 degrees), and preferably not heated. An unheated binder liquid is preferable from the viewpoint of maintaining good quality of powdered tea leaves (particularly, powdered tea leaves dispersed in a binder).
一実施形態において、バインダー液として、水に粉末茶葉を分散させたものを用いることが所望の平均粒子径を有する造粒粉末茶葉を得るために好ましい。粉末茶葉（又はそれから浸出した成分）が粒子同士の結着補助剤として機能するためである。水に分散させる粉末茶葉の量は、乾燥重量換算で造粒粉末茶葉の３％以上２０％以下、又は５％以上１５％以下の割合であることが好ましい。分散させる粉末茶葉の種類は特に制限されないが、原料として用いる粉末茶葉と同じであることが好ましい。 In one embodiment, it is preferable to obtain a granulated powdered tea leaf having a desired average particle diameter by using a binder liquid in which powdered tea leaves are dispersed in water. This is because the powdered tea leaves (or components leached therefrom) function as a binding aid between the particles. The amount of powdered tea leaves dispersed in water is preferably 3% or more and 20% or less, or 5% or more and 15% or less of the granulated powdered tea leaves in terms of dry weight. The type of powder tea leaves to be dispersed is not particularly limited, but is preferably the same as the powder tea leaves used as a raw material.
一実施形態において、バインダー液として、水に茶抽出物を配合したものを用いることが所望の平均粒子径を有する造粒粉末茶葉を得るために好ましい。茶抽出物が粒子同士の結着補助剤として機能するためである。茶抽出物の種類は特に制限されないが、緑茶の抽出物、例えば、造粒の原料として用いる粉末茶葉の抽出物であることが好ましい。抽出物を得るための溶媒は、特に制限されないが、水やエタノール等のアルコールを用いることができる。一実施形態において、溶媒は水であることが好ましい。例えば、茶抽出物は、茶葉（例えば、粉末茶葉）を水に添加し、必要に応じて撹拌しながら所定の時間かけて茶葉の成分を水等の溶媒に溶出させた後、濾過又は遠心分離によって茶葉を取り除き、濃縮及び／又は乾燥させることによって得ることができる。溶媒は加温されたもの（例えば、３０度以上９０度以下）であってもよい。水に配合する茶抽出物の量は、例えば、乾燥重量換算で造粒粉末茶葉の３％以上２０％以下、又は５％以上１５％以下の割合であることが好ましい。このような茶抽出物は、原料として用いる粉末茶葉に配合されていてもよい。 In one embodiment, it is preferable to use a blended tea extract with water as the binder liquid in order to obtain granulated powdered tea leaves having a desired average particle size. This is because the tea extract functions as a binding aid between particles. The type of tea extract is not particularly limited, but is preferably an extract of green tea, for example, an extract of powdered tea leaves used as a raw material for granulation. The solvent for obtaining the extract is not particularly limited, but alcohol such as water or ethanol can be used. In one embodiment, the solvent is preferably water. For example, a tea extract is prepared by adding tea leaves (for example, powdered tea leaves) to water, eluting the components of the tea leaves in a solvent such as water over a predetermined time while stirring, if necessary, and then filtering or centrifuging. Can be obtained by removing the tea leaves and concentrating and / or drying. The solvent may be heated (for example, 30 degrees or more and 90 degrees or less). The amount of tea extract to be blended in water is preferably, for example, a ratio of 3% to 20%, or 5% to 15% of the granulated powdered tea leaves in terms of dry weight. Such a tea extract may be blended in powdered tea leaves used as a raw material.
一実施形態において、バインダー液は、粉末茶葉及び茶抽出物が分散／溶解されたものであることが好ましい。この場合、水に配合する粉末茶葉及び茶抽出物の量は、これらを足し合わせた量が、乾燥重量換算で造粒粉末茶葉の３％以上２０％以下、又は５％以上１５％以下となるように調整されることが好ましい。 In one embodiment, the binder liquid is preferably one in which powdered tea leaves and tea extract are dispersed / dissolved. In this case, the amount of powdered tea leaves and tea extract to be mixed in water is 3% or more and 20% or less, or 5% or more and 15% or less of the granulated powdered tea leaves in terms of dry weight. It is preferable to adjust so.
一実施形態において、バインダー液は、２種類又は３種類のバインダー液を組み合わせて使用することが好ましい。ここで２種類のバインダー液とは、例えば、水と水に粉末茶葉を分散させたバインダー液を意味する。このような２種類のバインダー液を使用する場合、まず水をバインダー液として用いて造粒を行い、続いて水に粉末茶葉を分散させたバインダー液を用いて造粒させてもよく、逆の順序でバインダー液を用いてもよい。バインダー液の組み合わせは任意であり、また使用順序も特に制限されない。一実施形態において、水をバインダー液として用いた造粒をまず行い、続いて水に粉末茶葉及び茶抽出物を分散・溶解させたバインダー液を用いた造粒を行うことが好ましい。 In one embodiment, the binder liquid is preferably used in combination of two or three kinds of binder liquids. Here, the two types of binder liquids mean, for example, binder liquids in which powdered tea leaves are dispersed in water and water. When using these two types of binder liquids, granulation may be performed first using water as a binder liquid, followed by granulation using a binder liquid in which powdered tea leaves are dispersed in water. Binder liquids may be used in order. The combination of binder liquids is arbitrary, and the order of use is not particularly limited. In one embodiment, it is preferable to first perform granulation using water as a binder liquid, and then perform granulation using a binder liquid in which powdered tea leaves and tea extract are dispersed and dissolved in water.
バインダー液は、上述の賦形剤及び／又は添加剤を含んでいてもよい。一実施形態において、バインダー液は、賦形剤及び／又は添加剤を含まないことが好ましい。 The binder liquid may contain the above-mentioned excipients and / or additives. In one embodiment, the binder liquid preferably contains no excipients and / or additives.
バインダー液の量は、目的とする造粒粉末茶葉の平均粒径等に応じて設計することができる。例えば、バインダー液の量は、重量換算で、原料として用いる粉末茶葉の量の３０％以上、好ましくは４０％以上又は５０％以上であることが好ましい。 The amount of the binder liquid can be designed according to the average particle diameter of the intended granulated powder tea leaves. For example, the amount of the binder liquid is preferably 30% or more, preferably 40% or more, or 50% or more of the amount of powdered tea leaves used as a raw material in terms of weight.
バインダー液の噴霧速度は、特に制限されず、例えば、乾燥工程に供する造粒物に水分含量が１５重量％以上、好ましくは２０重量％以上となるように設計することが好ましい。一実施形態において、バインダー液の噴霧速度は、粉末茶葉の水分上昇速度が１重量％／分未満、０．９重量％／分未満、０．８重量％／分未満、０．７重量％／分未満となるように調整することが好ましい。水分上昇速度の下限は、特に制限されないが、例えば、０．１重量％／分以上とすることができる。ここで、水分上昇速度とは、次式によって求められる：水分上昇速度（％）＝（バインダー液の噴霧終了時の造粒粉末茶葉の水分量（％）−バインダー液を噴霧する前の原料粉末茶葉の水分量（％））／バインダー液の噴霧時間（分）。上述のように、バインダー液の噴霧を途中で中断する場合、「バインダー液の噴霧時間（分）」に中断時間も含まれるものとする。水分上昇速度をこのように調整することは、嵩密度を所望の範囲に調節し、分散安定性に優れた造粒粉末茶葉を得るという観点で好ましい。 The spray rate of the binder liquid is not particularly limited, and for example, it is preferable to design the granulated product to be subjected to the drying step so that the water content is 15% by weight or more, preferably 20% by weight or more. In one embodiment, the spray rate of the binder liquid is such that the rate of water rise in the powdered tea leaves is less than 1 wt% / min, less than 0.9 wt% / min, less than 0.8 wt% / min, 0.7 wt% / min. It is preferable to adjust so that it may be less than a minute. The lower limit of the moisture increase rate is not particularly limited, but can be, for example, 0.1% by weight / min or more. Here, the moisture increase rate is obtained by the following formula: moisture increase rate (%) = (moisture content (%) of granulated powder tea leaf at the end of spraying of the binder liquid) -raw material powder before spraying the binder liquid Water content of tea leaves (%)) / Binder spray time (min). As described above, when the spraying of the binder liquid is interrupted halfway, the “spraying time (minutes) of the binder liquid” includes the interrupting time. Adjusting the moisture increase rate in this way is preferable from the viewpoint of adjusting the bulk density to a desired range and obtaining granulated powder tea leaves having excellent dispersion stability.
バインダー液の噴霧は、バインダー液を全量噴霧するまで連続的に行ってもよく、所定の時間噴霧後に所定の時間噴霧を中断するというサイクルを所定の回数繰り返して行ってもよい。例えば、中断は、造粒中にブロッキングが生じるのを回避するために設けることができる。また、中断は、造粒装置の設計上必要な場合もある。 Spraying of the binder liquid may be performed continuously until the entire amount of binder liquid is sprayed, or a cycle of spraying for a predetermined time after spraying for a predetermined time may be repeated a predetermined number of times. For example, an interruption can be provided to avoid blocking during granulation. In addition, interruption may be necessary in the design of the granulator.
バインダー液の噴霧後、必要に応じて、造粒粉末茶葉を乾燥させることが好ましい。乾燥は、例えば、造粒粉末茶葉の品温が４０℃以上になるように、約１００℃の空気を給気することで行うことができる。乾燥は、造粒粉末茶葉の水分量が、例えば５重量％以下になるまで行うことが好ましい。 After spraying the binder liquid, it is preferable to dry the granulated powdered tea leaves as necessary. Drying can be performed, for example, by supplying air at about 100 ° C. so that the product temperature of the granulated powdered tea leaves is 40 ° C. or higher. Drying is preferably performed until the water content of the granulated powdered tea leaves is, for example, 5% by weight or less.
得られた造粒粉末茶葉は、必要に応じて整粒し、所望の容器に充填することができる。一実施形態において、造粒粉末茶葉は、スティック包装又はピロー包装された形態であることが好ましい。 The obtained granulated powder tea leaves can be sized as required and filled into a desired container. In one embodiment, the granulated powder tea leaves are preferably in the form of stick packaging or pillow packaging.
以下、実施例により本発明についてさらに詳細に説明するが、本発明はこれらに制限されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not restrict | limited to these.
水分量の測定方法
原料として用いた抹茶及び粉末茶、並びに造粒茶葉の水分量は、赤外線水分計（ＭＦ−５０：エーアンドデイ社製）を用い、５ｇのサンプルを常圧、１０５℃の条件下で加熱し測定した。重量変化が０．２％／分以下となった点を終点とした。
Moisture content measurement method Matched tea powder and powdered tea used as raw materials, and the moisture content of the granulated tea leaves, using an infrared moisture meter (MF-50: manufactured by A & D Co., Ltd.), a 5 g sample at normal pressure and 105 ° C It heated and measured with. The point at which the weight change was 0.2% / min or less was defined as the end point.
原料粒子径の測定方法（湿式）
原料として用いた抹茶及び粉末茶の粒子径は、レーザー回折・散乱式粒子径分布測定装置：マイクロトラックＭＴ３３００ＥＸＩＩ（マイクロトラック・ベル社製）を使用して測定した。使用書にしたがい、装置にサンプルを投入し、３０秒間循環した後の５０％粒子径（Ｄ５０）を測定した。測定条件は下記のとおりである。
循環器：ＵＳＶＲ（循環時目盛：４）
溶媒：水
ＳｅｔＺｅｒｏ時間：１０秒
測定時間：１０秒
粒子屈折率：１．６０％
粒子形状：非球形
Raw material particle size measurement method (wet)
The particle sizes of matcha and powdered tea used as raw materials were measured using a laser diffraction / scattering particle size distribution analyzer: Microtrac MT3300EXII (manufactured by Microtrac Bell). In accordance with the instructions for use, the sample was put into the apparatus and the 50% particle diameter (D50) after being circulated for 30 seconds was measured. The measurement conditions are as follows.
Circulator: USVR (Scale during circulation: 4)
Solvent: Water SetZero time: 10 seconds Measurement time: 10 seconds Particle refractive index: 1.60%
Particle shape: non-spherical
造粒茶葉の平均粒子径の測定方法（乾式）
レーザー回折・散乱式粒子径分布測定装置：マイクロトラックＭＴ３３００ＥＸＩＩ（マイクロトラック・ベル社製）を用いて５０％粒子径（Ｄ５０）を測定した。サンプルコンディショナーとしてワンショットドライを使用した。測定条件は下記のとおりである。
ＳｅｔＺｅｒｏ時間：５秒
測定時間：５秒
粒子屈折率：１．６０％
粒子形状：非球形
Method for measuring the average particle size of granulated tea leaves (dry method)
Laser diffraction / scattering particle size distribution measuring apparatus: 50% particle size (D50) was measured using Microtrac MT3300EXII (manufactured by Microtrac Bell). One shot dry was used as a sample conditioner. The measurement conditions are as follows.
SetZero time: 5 seconds Measurement time: 5 seconds Particle refractive index: 1.60%
Particle shape: non-spherical
嵩比重の測定方法
１００ｍｌ容量の円筒状容器に造粒茶葉を自然落下させて容器内を造粒茶葉で満たし、摺り切り一杯（１００ｍｌ）にして、容器内に充填された造粒物の重量を測定し、それを容量で割った値を嵩比重とした。
Method of measuring bulk specific gravity The granulated tea leaves are naturally dropped into a 100 ml capacity cylindrical container to fill the container with the granulated tea leaves, and squeeze the whole (100 ml) to determine the weight of the granulated product filled in the container. A value obtained by measuring and dividing by the capacity was defined as bulk specific gravity.
分散性の評価
ビーカーに２５０ｍｌの常温の水を入れ、スターラーで７００ｒｐｍの速さで撹拌し、５ｇの造粒粉末茶を２重量％となる量で加え、５秒間撹拌した後の状態を目視で観察し、下記の基準に従って評価した。
○：ダマが全く見られず、粉末茶が良好に分散している。
△：５ｍｍ未満の小さなダマが見られる。
×：５ｍｍ以上の大きなダマが見られる。
Evaluation of dispersibility 250 ml of room temperature water was put into a beaker, stirred at a speed of 700 rpm with a stirrer, 5 g of granulated powder tea was added in an amount of 2% by weight, and the state after stirring for 5 seconds was visually observed. Observed and evaluated according to the following criteria.
○: No lumps are observed and powdered tea is well dispersed.
Δ: Small lumps of less than 5 mm are observed.
X: A large lump of 5 mm or more is observed.
分散安定性の評価
ビーカーに２５０ｍｌの常温の水を入れ、スターラーで７００ｒｐｍの速さで撹拌し、５ｇの造粒粉末茶を２重量％となる量で加え、５秒間撹拌した後、３００ｍｌのメスシリンダーを垂直に立てて上から注ぎ入れ、３分後の抹茶の沈殿量（体積（ｍＬ））を測定した。
Evaluation of Dispersion Stability 250 ml of normal temperature water was put in a beaker, stirred at a speed of 700 rpm with a stirrer, 5 g of granulated powdered tea was added in an amount of 2% by weight, stirred for 5 seconds, and then 300 ml of female. The cylinder was set up vertically and poured from above, and the amount of green tea precipitated (volume (mL)) after 3 minutes was measured.
以下の製造例で使用した抹茶は、平均粒子径２３μｍ、水分量４．９重量％のものである。以下の製造例で使用した粉末茶（煎茶）は、平均粒子径２６μｍ、水分量３．３重量％のものである。 Matcha used in the following production examples has an average particle size of 23 μm and a water content of 4.9% by weight. Powdered tea (sencha) used in the following production examples has an average particle size of 26 μm and a water content of 3.3% by weight.
製造例１：
１０００ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、給気温度８０℃で造粒を行った。７５０ｇの常温の水をバインダー液として用い、流速１５ｇ／分で噴きつけた。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ３２重量％（水分上昇速度０．５４％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。
Production Example 1:
1000 g of green tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC) and granulated at an air supply temperature of 80 ° C. 750 g of room temperature water was used as a binder liquid and sprayed at a flow rate of 15 g / min. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the moisture content of the granulated product was measured and found to be 32% by weight (moisture increase rate 0.54% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves.
製造例２：
９００ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、給気温度８０℃で造粒を行った。５００ｇの常温の水に１００ｇの茶抽出物を溶解したものをバインダー液として用い、流速１６．２ｇ／分で噴きつけた。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ２０．８重量％（水分上昇速度０．４３％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。尚、使用した茶抽出物は、抹茶を３０倍量の５０℃の水中で２５分間抽出し、ろ過または遠心分離で茶葉を取り除き、抽出液を逆浸透膜で濃縮し、噴霧乾燥させたものを使用した。
Production Example 2:
900 g of green tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC) and granulated at an air supply temperature of 80 ° C. A solution obtained by dissolving 100 g of tea extract in 500 g of normal temperature water was used as a binder liquid and sprayed at a flow rate of 16.2 g / min. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the water content of the granulated product was measured and found to be 20.8% by weight (water increase rate 0.43% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves. In addition, the used tea extract is extracted from matcha tea in 30 times the amount of 50 ° C water for 25 minutes, filtered or centrifuged to remove the tea leaves, concentrated the extract with a reverse osmosis membrane, and spray dried. used.
製造例３：
１０００ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、給気温度８０℃で造粒を行った。６５０ｇの常温の水をバインダー液として用い、流速１３ｇ／分で噴きつけた。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ２４．９重量％（水分上昇速度０．４％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。
Production Example 3:
1000 g of green tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC) and granulated at an air supply temperature of 80 ° C. 650 g of room temperature water was used as a binder liquid and sprayed at a flow rate of 13 g / min. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the water content of the granulated product was measured and found to be 24.9% by weight (water increase rate 0.4% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves.
製造例４：
９００ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、１００ｇの常温の水をバインダー液として用いて流速７．６ｇ／分で噴きつけ、給気温度５０℃で造粒を開始した。バインダー液の噴きつけが終わったところで、給気温度を９０℃に変更し、３００ｇの常温の水に５０ｇの抹茶及び５０ｇの茶抽出物を分散／溶解させたものをバインダーとして用い、１８．２ｇ／分の流速で噴きつけるという条件に変更し、造粒を継続した。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ２２．５重量％（水分上昇速度０．５％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。尚、使用した茶抽出物は、抹茶を３０倍量の５０℃の水中で２５分間抽出し、ろ過または遠心分離で茶葉を取り除き、抽出液を逆浸透膜で濃縮し、噴霧乾燥させたものを使用した。
Production Example 4:
900 g of matcha tea is charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC), sprayed at a flow rate of 7.6 g / min using 100 g of normal temperature water as a binder liquid, and an air supply temperature of 50 ° C. The granulation was started. When the spraying of the binder liquid is finished, the supply air temperature is changed to 90 ° C., and 50 g of matcha tea and 50 g of tea extract are dispersed / dissolved in 300 g of room temperature water as a binder. The condition was changed to spraying at a flow rate of / min and granulation was continued. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the water content of the granulated product was measured and found to be 22.5% by weight (water increase rate 0.5% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves. In addition, the used tea extract is extracted from matcha tea in 30 times the amount of 50 ° C water for 25 minutes, filtered or centrifuged to remove the tea leaves, concentrated the extract with a reverse osmosis membrane, and spray dried. used.
製造例５：
９００ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、給気温度８０℃で造粒を行った。５００ｇの常温の水に１００ｇの抹茶を分散させたものをバインダー液として用い、流速１５ｇ／分で噴きつけた。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ２３．７重量％（水分上昇速度０．４７％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。
Production Example 5:
900 g of green tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC) and granulated at an air supply temperature of 80 ° C. A solution obtained by dispersing 100 g of green tea in 500 g of normal temperature water was used as a binder liquid and sprayed at a flow rate of 15 g / min. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the water content of the granulated product was measured and found to be 23.7% by weight (water increase rate 0.47% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves.
製造例６：
１０００ｇの粉末茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、給気温度９０℃で造粒を行った。５００ｇの常温の水をバインダー液として用い、流速１２．２ｇ／分で噴きつけた。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ１６．３５重量％（水分上昇速度０．３２％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。
Production Example 6:
1000 g of powdered tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC) and granulated at an air supply temperature of 90 ° C. 500 g of room temperature water was used as a binder liquid and sprayed at a flow rate of 12.2 g / min. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the water content of the granulated product was measured and found to be 16.35% by weight (water increase rate 0.32% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves.
製造例７：
７５０ｇの粉末茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、１００ｇの常温の水をバインダー液として用いて流速７．７ｇ／分で噴きつけ、給気温度６０℃で造粒を開始した。バインダー液の噴きつけが終わったところで、給気温度を１００℃に変更し、８７５ｇの常温の水に１２５ｇの抹茶及び１２５ｇの茶抽出物を分散／溶解させたものをバインダー液として用い、１４．６ｇ／分の流速で噴きつけるという条件に変更し、造粒を継続した。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ２６．４重量％（水分上昇速度０．２６％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。尚、使用した茶抽出物は、粉末茶を３０倍量の５０℃の水中で２５分間抽出し、ろ過または遠心分離で茶葉を取り除き、抽出液を逆浸透膜で濃縮し、噴霧乾燥させたものを使用した。
Production Example 7:
750 g of powdered tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by Pou Lec Co., Ltd.), 100 g of room temperature water was used as a binder liquid, and sprayed at a flow rate of 7.7 g / min. Granulation was started at ° C. When the spraying of the binder liquid is finished, the air supply temperature is changed to 100 ° C., and 125 g of matcha tea and 125 g of tea extract are dispersed / dissolved in 875 g of room temperature water as the binder liquid. The condition was changed to spraying at a flow rate of 6 g / min, and granulation was continued. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the water content of the granulated product was measured and found to be 26.4% by weight (water increase rate 0.26% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves. The tea extract used was obtained by extracting powdered tea in 30 times 50 ° C water for 25 minutes, removing tea leaves by filtration or centrifugation, concentrating the extract with a reverse osmosis membrane, and spray drying. It was used.
製造例８：
８００ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、１００ｇの常温の水をバインダー液として用いて流速７．７ｇ／分で噴きつけ、給気温度５０℃で造粒を開始した。バインダー液の噴きつけが終わったところで、給気温度を１００℃に変更し、７００ｇの常温の水に１００ｇの抹茶及び１００ｇの茶抽出物を分散／溶解させたものをバインダー液として用い、２０ｇ／分の流速で噴きつけるという条件に変更し、造粒を継続した。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ２５．３重量％（水分上昇速度０．３５％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。尚、使用した茶抽出物は、抹茶を３０倍量の５０℃の水中で２５分間抽出し、ろ過または遠心分離で茶葉を取り除き、抽出液を逆浸透膜で濃縮し、噴霧乾燥させたものを使用した。
Production Example 8:
Charge 800 g of matcha tea to a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC), spray 100 g of normal temperature water as a binder liquid at a flow rate of 7.7 g / min, and supply air temperature 50 ° C. The granulation was started. When the spraying of the binder liquid was finished, the supply temperature was changed to 100 ° C., and 100 g of green tea and 100 g of tea extract were dispersed / dissolved in 700 g of room temperature water as the binder liquid, and 20 g / The condition was changed to spraying at a flow rate of minutes, and granulation was continued. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the water content of the granulated product was measured and found to be 25.3% by weight (water increase rate 0.35% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves. In addition, the used tea extract is extracted from matcha tea in 30 times the amount of 50 ° C water for 25 minutes, filtered or centrifuged to remove the tea leaves, concentrated the extract with a reverse osmosis membrane, and spray dried. used.
製造例９：
８６０ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、１００ｇの常温の水をバインダー液として用いて流速６．３ｇ／分で噴きつけ、給気温度５０℃で造粒を開始した。バインダー液の噴きつけが終わったところで、給気温度を１００℃に変更し、８５０ｇの常温の水に１２０ｇの抹茶及び１２０ｇの茶抽出物を分散／溶解させたものをバインダー液として用い、１７ｇ／分の流速で噴きつけるという条件に変更し、造粒を継続した。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ２４．５重量％（水分上昇速度０．２５％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。尚、使用した茶抽出物は、抹茶を３０倍量の５０℃の水中で２５分間抽出し、ろ過または遠心分離で茶葉を取り除き、抽出液を逆浸透膜で濃縮し、噴霧乾燥させたものを使用した。
Production Example 9:
860 g of matcha tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC), sprayed at a flow rate of 6.3 g / min using 100 g of normal temperature water as a binder liquid, and an air supply temperature of 50 ° C. The granulation was started. When the spraying of the binder liquid was completed, the air supply temperature was changed to 100 ° C., and 120 g of matcha tea and 120 g of tea extract were dispersed / dissolved in 850 g of room temperature water as the binder liquid. The condition was changed to spraying at a flow rate of minutes, and granulation was continued. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the moisture content of the granulated product was measured and found to be 24.5% by weight (moisture increase rate 0.25% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves. In addition, the used tea extract is extracted from matcha tea in 30 times the amount of 50 ° C water for 25 minutes, filtered or centrifuged to remove the tea leaves, concentrated the extract with a reverse osmosis membrane, and spray dried. used.
製造例１０：
７６０ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、１００ｇの常温の水をバインダー液として用いて流速６．７ｇ／分で噴きつけ、給気温度５０℃で造粒を開始した。バインダー液の噴きつけが終わったところで、給気温度を１００℃に変更し、８５０ｇの常温の水に１２０ｇの抹茶及び１２０ｇの茶抽出物を分散／溶解させたものをバインダー液として用い、１４．５ｇ／分の流速で噴きつけるという条件に変更し、造粒を継続した。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ２３．２重量％（水分上昇速度０．２％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。尚、使用した茶抽出物は、抹茶を３０倍量の５０℃の水中で２５分間抽出し、ろ過または遠心分離で茶葉を取り除き、抽出液を逆浸透膜で濃縮し、噴霧乾燥させたものを使用した。
Production Example 10:
760 g of matcha tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC), sprayed at a flow rate of 6.7 g / min using 100 g of normal temperature water as a binder liquid, and an air supply temperature of 50 ° C. The granulation was started. When the spraying of the binder liquid is finished, the supply air temperature is changed to 100 ° C., and 120 g of matcha tea and 120 g of tea extract are dispersed / dissolved in 850 g of room temperature water as the binder liquid. The condition was changed to spraying at a flow rate of 5 g / min, and granulation was continued. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the water content of the granulated product was measured and found to be 23.2% by weight (water increase rate 0.2% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves. In addition, the used tea extract is extracted from matcha tea in 30 times the amount of 50 ° C water for 25 minutes, filtered or centrifuged to remove the tea leaves, concentrated the extract with a reverse osmosis membrane, and spray dried. used.
製造例１１：
７００ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、１００ｇの常温の水をバインダー液として用いて流速７．１ｇ／分で噴きつけ、給気温度６０℃で造粒を開始した。バインダー液の噴きつけが終わったところで、給気温度を１００℃に変更し、１０３０ｇの常温の水に１５０ｇの抹茶及び１５０ｇの茶抽出物を分散／溶解させたものをバインダー液として用い、１５．３ｇ／分の流速で噴きつけるという条件に変更し、造粒を継続した。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ２４．１重量％（水分上昇速度０．１９％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。尚、使用した茶抽出物は、抹茶を３０倍量の５０℃の水中で２５分間抽出し、ろ過または遠心分離で茶葉を取り除き、抽出液を逆浸透膜で濃縮し、噴霧乾燥させたものを使用した。
Production Example 11:
700 g of green tea is charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC), sprayed at a flow rate of 7.1 g / min using 100 g of normal temperature water as a binder liquid, and an air supply temperature of 60 ° C. The granulation was started. When the spraying of the binder liquid is finished, the supply air temperature is changed to 100 ° C., and 150 g of green tea and 150 g of tea extract are dispersed / dissolved in 1030 g of room temperature water as the binder liquid. The condition was changed to spraying at a flow rate of 3 g / min, and granulation was continued. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the water content of the granulated product was measured and found to be 24.1% by weight (water increase rate 0.19% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves. In addition, the used tea extract is extracted from matcha tea in 30 times the amount of 50 ° C water for 25 minutes, filtered or centrifuged to remove the tea leaves, concentrated the extract with a reverse osmosis membrane, and spray dried. used.
製造例１２：
９００ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、１００ｇの常温の水をバインダー液として用いて流速５．３ｇ／分で噴きつけ、給気温度５０℃で造粒を開始した。バインダー液の噴きつけが終わったところで、給気温度を１００℃に変更し、２５０ｇの常温の水に５０ｇの抹茶及び５０ｇの茶抽出物を分散／溶解させたものをバインダー液として用い、１２．１ｇ／分の流速で噴きつけるという条件に変更し、造粒を継続した。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ１２．７重量％（水分上昇速度０．１６％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。尚、使用した茶抽出物は、抹茶を３０倍量の５０℃の水中で２５分間抽出し、ろ過または遠心分離で茶葉を取り除き、抽出液を逆浸透膜で濃縮し、噴霧乾燥させたものを使用した。
Production Example 12:
900 g of matcha tea is charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC), sprayed at a flow rate of 5.3 g / min using 100 g of normal temperature water as a binder liquid, and an air supply temperature of 50 ° C. The granulation was started. When the spraying of the binder liquid is finished, the supply air temperature is changed to 100 ° C., and 50 g of green tea and 50 g of tea extract are dispersed / dissolved in 250 g of room temperature water as the binder liquid. The condition was changed to spraying at a flow rate of 1 g / min, and granulation was continued. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the water content of the granulated product was measured and found to be 12.7% by weight (water increase rate 0.16% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves. In addition, the used tea extract is extracted from matcha tea in 30 times the amount of 50 ° C water for 25 minutes, filtered or centrifuged to remove the tea leaves, concentrated the extract with a reverse osmosis membrane, and spray dried. used.
製造例１３：
１０００ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、給気温度８０℃で造粒を行った。５００ｇの常温の水をバインダー液として用い、流速１３．５ｇ／分で噴きつけた。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ２６．４重量％（水分上昇速度０．５８％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。
Production Example 13:
1000 g of green tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC) and granulated at an air supply temperature of 80 ° C. 500 g of room temperature water was used as a binder liquid and sprayed at a flow rate of 13.5 g / min. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the moisture content of the granulated product was measured and found to be 26.4% by weight (water increase rate 0.58% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves.
製造例１４：
１０００ｇの粉末茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、給気温度２５で造粒を行った。５４０ｇの常温の水をバインダー液として用い、流速４５ｇ／分で４０秒間噴きつけ、１２秒間中断するというサイクルを１８回繰り返し、バインダー液を全量噴きつけた時点で造粒を終了した。造粒物の水分量を測定したところ３１．３重量％（水分上昇速度１．７９％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。
Production Example 14:
1000 g of powdered tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC), and granulated at an air supply temperature of 25. Using 540 g of normal temperature water as the binder liquid, a cycle of spraying for 40 seconds at a flow rate of 45 g / min and interrupting for 12 seconds was repeated 18 times, and granulation was completed when the entire amount of the binder liquid was sprayed. When the moisture content of the granulated product was measured, it was 31.3 wt% (moisture increase rate 1.79% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves.
製造例１５：
１０００ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、給気温度８０℃で造粒を行った。６００ｇの常温の水をバインダー液として用い、流速４０ｇ／分で噴きつけた。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ３５．２重量％（水分上昇速度２．０２％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。
Production Example 15:
1000 g of green tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC) and granulated at an air supply temperature of 80 ° C. 600 g of room temperature water was used as a binder liquid and sprayed at a flow rate of 40 g / min. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the water content of the granulated product was measured and found to be 35.2% by weight (water increase rate 2.02% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves.
製造例１６：
７００ｇの抹茶を流動層造粒機（ＦＤ−ＭＰ−０１Ｄ型：パウレック社製）に仕込み、１００ｇの常温の水をバインダー液として用いて流速１２．５ｇ／分で噴きつけ、給気温度６０℃で造粒を開始した。バインダー液の噴きつけが終わったところで、給気温度を１００℃に変更し、１０３０ｇの常温の水に１５０ｇの抹茶及び１５０ｇの茶抽出物を分散／溶解させたものをバインダー液として用い、１５．３ｇ／分の流速で噴きつけるという条件に変更し、造粒を継続した。バインダー液を全量噴きつけた時点で造粒を終了し、造粒物の水分量を測定したところ２９．３重量％（水分上昇速度０．２６％／分）であった。その後品温が４０℃以上になるまで給気温度１００℃にて乾燥し、造粒粉末茶葉を得た。尚、使用した茶抽出物は、抹茶を３０倍量の５０℃の水中で２５分間抽出し、ろ過または遠心分離で茶葉を取り除き、抽出液を逆浸透膜で濃縮し、噴霧乾燥させたものを使用した。
Production Example 16:
700 g of green tea was charged into a fluidized bed granulator (FD-MP-01D type: manufactured by POWREC), sprayed at a flow rate of 12.5 g / min using 100 g of normal temperature water as a binder liquid, and an air supply temperature of 60 ° C. The granulation was started. When the spraying of the binder liquid is finished, the supply air temperature is changed to 100 ° C., and 150 g of green tea and 150 g of tea extract are dispersed / dissolved in 1030 g of room temperature water as the binder liquid. The condition was changed to spraying at a flow rate of 3 g / min, and granulation was continued. When the entire amount of the binder liquid was sprayed, the granulation was completed, and the moisture content of the granulated product was measured and found to be 29.3% by weight (moisture increase rate 0.26% / min). Thereafter, it was dried at a supply air temperature of 100 ° C. until the product temperature reached 40 ° C. or higher to obtain granulated powdered tea leaves. In addition, the used tea extract is extracted from matcha tea in 30 times the amount of 50 ° C water for 25 minutes, filtered or centrifuged to remove the tea leaves, concentrated the extract with a reverse osmosis membrane, and spray dried. used.
製造例１〜１６で得た造粒粉末茶葉の平均粒子径、嵩比重、分散性、及び分散安定性を下記表に示す。 The average particle diameter, bulk specific gravity, dispersibility, and dispersion stability of the granulated powder tea leaves obtained in Production Examples 1 to 16 are shown in the following table.
表１に示されるとおり、製造例１〜１１及び１４〜１６の造粒粉末茶葉は、分散性試験において、ダマが全く観察されず、水への分散性に優れることが確認された。一方で、製造例１２の造粒粉末茶葉では、５ｍｍ以上の大きなダマが形成され、製造例１３では５ｍｍ未満ではあるが明らかなダマが見られ、分散性は不十分であることが確認された。製造例１〜１１及び１４〜１６の造粒粉末茶葉は、製造例１２〜１３の造粒粉末茶葉よりも、平均粒子径が大きいことにより、十分な分散性が発揮されると考えられる。これは、理論に拘束される訳ではないが、粒子径が大きくなることにより、粒子同士の静電気による引き合いよりも粒子自体の持つ運動エネルギーが大きくなり、また粒子と粒子の間に隙間が生じることにより、水中で分散し易くなるためと考えられる。製造例１４〜１６の造粒粉末茶葉は水に分散したのち短時間で粉末茶が沈降し、容器の底に堆積するため、分散安定性が十分ではないことが確認された。一方、製造例１〜１１の造粒粉末茶葉は、水に分散した後の茶粒子の沈降が有意に遅く、分散性に優れるだけでなく、分散安定性にも優れることが確認された。尚、製造例１２及び１３については、ダマが形成されたため、分散安定性については評価しなかった。製造例１〜１１と製造例１４〜１６との比較から、造粒粉末茶葉の嵩比重が小さいことが製造例１〜１１の良好な分散安定性に寄与し、製造例１４〜１６の造粒粉末茶は、嵩比重が大きいことにより、粒子の沈降が早いことが分かる。嵩比重が低い（密度が低い）ことにより、粒子間に水が浸透し易く、造粒によって結着されていたものが崩れ、より元の茶粒子に近い粒子が水中で分散し易くなると考えられる。一方、製造例１４〜１６の造粒粉末茶葉は、嵩比重が大きい（つまり、より圧密された硬い造粒物が形成されている）ため、水が粒子間に浸透し難く、水中で一応の分散はするものの、造粒により結着された構造が完全には崩壊せず、その結果沈殿速度が速くなると考えられる。 As shown in Table 1, it was confirmed that the granulated powder tea leaves of Production Examples 1 to 11 and 14 to 16 were excellent in dispersibility in water with no lumps observed in the dispersibility test. On the other hand, in the granulated powder tea leaves of Production Example 12, large lumps of 5 mm or more were formed, and in Production Example 13, obvious lumps were observed although it was less than 5 mm, and it was confirmed that the dispersibility was insufficient. . The granulated powder tea leaves of Production Examples 1 to 11 and 14 to 16 are considered to exhibit sufficient dispersibility due to the larger average particle diameter than the granulated powder tea leaves of Production Examples 12 to 13. This is not limited by theory, but as the particle size increases, the kinetic energy of the particle itself becomes larger than the electrostatic attraction between the particles, and a gap is created between the particles. Therefore, it is considered that it becomes easy to disperse in water. Since the granulated powdered tea leaves of Production Examples 14 to 16 were dispersed in water and powdered tea settled in a short time and deposited on the bottom of the container, it was confirmed that the dispersion stability was not sufficient. On the other hand, it was confirmed that the granulated powdered tea leaves of Production Examples 1 to 11 were significantly slow in settling of tea particles after being dispersed in water, and were excellent not only in dispersibility but also in dispersion stability. In Production Examples 12 and 13, because of the formation of lumps, the dispersion stability was not evaluated. From the comparison between Production Examples 1 to 11 and Production Examples 14 to 16, that the bulk specific gravity of the granulated powder tea leaves contributed to the good dispersion stability of Production Examples 1 to 11, and the granulation of Production Examples 14 to 16 It can be seen that powder tea has a fast sedimentation due to its large bulk specific gravity. Low bulk density (low density) facilitates water permeation between particles, breaks up particles bound by granulation, and makes it easier for particles closer to the original tea particles to be dispersed in water. . On the other hand, the granulated powder tea leaves of Production Examples 14 to 16 have a large bulk specific gravity (that is, a hard granulated product that is more compacted is formed), so that it is difficult for water to penetrate between the particles, Although dispersed, the structure bound by granulation is not completely destroyed, and as a result, the precipitation rate is considered to increase.
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