Processing and preparation process of indigo powder

Abstract

The invention discloses a processing and preparation process of indigo powder. The processing and preparation process comprises the following steps of: airing indigo leaves for later use; putting theair-dried indigo leaves into a cloth bag to knead the air-dried indigo leaves; adding purified water, lime and sodium chloride into an indigo pool, and performing uniform stirring; putting the indigoleaf raw material into an indigo pool, and covering the indigo leaves with glutinous rice straw; introducing pressurized hot gas into the indigo pool; fishing out the indigo leaves and the glutinous rice straw, removing impurities in indigo liquid, and putting the indigo liquid into a prepared liquid material barrel; sending a precipitate subjected to standing precipitation into a vacuum filter tofilter out moisture; adding calcium chloride and quintozene into prepared indigo mud, performing uniform stirring, and drying to remove moisture; then putting an indigo block mold to prepare indigo blocks; crushing the indigo blocks in a crusher to obtain indigo powder, and further drying the indigo powder; sterilizing and inspecting the prepared indigo powder, and then vacuumizing and packagingthe indigo powder. The indigo powder processing and preparing technology well ensures the indigo liquid yield, and improves indigo powder processing benefits.

Description

technical field [0001] The invention relates to the technical field of indigo processing, in particular to a process for preparing indigo powder. Background technique [0002] In recent years, as people pay more and more attention to the cultural heritage of ethnic minorities, indigo processing has also developed to a certain extent. Blue indigo is the powder or agglomerate obtained from the processed leaves of the Acanthaceae plant, which can be used as a dye. Indigo is a perennial herb in plant form, the stems are often branched in pairs, and the tender parts and inflorescences are covered with brown pilose. Leaves are opposite, apex acuminate, edges have coarse teeth, black when dry. Spikes erect; bracts opposite; calyx 5-lobed; corolla tube-shaped, purple; stamens 4, didynamous; ovary 2-loculed, 2 ovules per locule. Capsule rod-shaped. Seeds ovoid. Flowering in autumn and fruiting in winter, indigo grows in humid places near forests. The cultivation and production ...

AI Technical Summary

Problems solved by technology

However, without starting from the characteristics of indigo, the indigo soaked and fermented is not sufficient, so that the output of indigo liquid is less, and the benefits of processed indigo powder are poor

Moreover, the drying process is not properly handled, making the processed indigo powder easy to regain moisture and deteriorate, which affects the quality of the indigo powder and the quality of subsequent indigo products.