| 摘要 |
PURPOSE: A method for making a natural dye, which is environmentally friendly and favorable to human bodies, from natural plats in a large amount, is provided to prevent environmental pollutions and skin diseases. CONSTITUTION: The method comprises the steps of: washing raw materials, mixing the raw materials with water and introducing them into an extractor, heating and filtering to separate the extract; introducing the extract into a storage tank equipped with an agitator, agitating it to obtain a constant concentration of the extract and filtering; concentrating the extract by heating in a concentration tank and agitating the concentrate; passing the concentrate to a vacuum dryer, heating and drying while the water vapor is removed; pulverizing the dried concentrate to obtain a powdery dye; and packaging the pulverized powdery dye in a predetermined amount by a band sealer.
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