木薯淀粉介绍精品课件

1、木薯淀粉介绍第1页，共10页，2022年，5月20日，2点13分，星期四 Cassava, is also called manioc or yucca. The plant grows in a bushy form, up to 2.4 m (8 ft) tall, with greenish-yellow flowers. The roots are up to 8 cm (3 in) thick and 91 cm (36 in) long. The roots contain from 20 to 32% of starch at maturity. Early maturing c

2、ultivars are ready for harvest after 8-12 month. About cassava第2页，共10页，2022年，5月20日，2点13分，星期四 Two varieties of the cassava are of economic value: the bitter, or poisonous; and the sweet, or non-poisonous. The toxin in cassava is called linamarin. It is chemically similar to sugar but with a CN ion at

3、tached. Just a few pieces of cassava roots containa fatal dose of poison. 第3页，共10页，2022年，5月20日，2点13分，星期四DryingSettling or dewateringCassava starchPeelingFiltering/screeingWashingCassava rootMixing with water Starch washing SettingGrating/raspingMillingSimple process for cassava starch production 第4页

4、，共10页，2022年，5月20日，2点13分，星期四 Starch is one of the most abundant substances in nature, a renewable and almost unlimited resource. Cassava starch is an important source of energy for humans and animals as food, and has many remarkable characteristics, including high paste viscosity, high paste clarity,

5、 and high freeze-thaw stability, which are advantageous to many industries as a raw material, such as paper, textiles, adhesives, confectionery, pharmaceuticals, and building materials.Application 第5页，共10页，2022年，5月20日，2点13分，星期四The root in powder form is used to prepare farinha, a meal used to make t

6、hin cakes sometimes called cassava bread. The starch of cassava yields a product called Brazilian arrowroot.Asfood 1 第6页，共10页，2022年，5月20日，2点13分，星期四Paper industry In the paper and board industries, starch is used in large quantities at three points during the manufacturing process: . at the end of th

7、e wet treatment, when the basic cellulose fiber is beaten to the desired pulp to increase the strength of the finished paper and to impart body and resistance to scuffing and folding; . at the size press, when the paper sheet has been formed and partially dried, starch is usually added to one or bot

8、h sides of the paper sheet to improve the finish, appearance, strength, and printing properties; . in the coating operation, when a pigment coating is required for paper, starch acts as a coating agent and as an adhesive. 2 第7页，共10页，2022年，5月20日，2点13分，星期四Textile industry In the textile industry, star

9、ch is used in three main areas: sizing, finishing and printing. And approximately 80% of the starch used in textiles is used in sizing. 3 第8页，共10页，2022年，5月20日，2点13分，星期四Adhesives industry 4 Cassava starch adhesives are more viscous and smoother working. They are fluid, stable glues of neutral pH that can be eas