LIFE CYCLE OF THE SILKWORM
神奇的变化
David silkworm pupae and eventually to become as an adult，became a pupa cocoon layer of protection. In addition，the silkworm body if too many amino acids will also silkworm poisoning，therefore，silkworm silk cocooning body to adapt to the environment is a survival instinct. A silkworm to spend about 3 days out for more than 1000 meters of silk，to form a cocoon.
To a unit weight of silkworm，a silkworm can be raised in general re-Silkworm 18000.
Spring silkworms to consume about a 700KG of mulberry leaves.
A silkworm cocoon weight node to a cocoon re-2G standard，except for loss，cocoon production is about more than 35KG.
A 90*with 90 silk scarf for about 80G cocoon with 450.
A silk dress with about 1200 with about 200G cocoon.
According to their sources of textile fibers into the natural fiber and chemical fiber. Natural fiber is the natural growth or the formation of the fiber，according to its biological properties can be divided into the plant fiber，animal fiber and mineral fiber，silk fiber are animals. And chemical fiber is through chemical and mechanical methods of synthesis.
Under a microscope，a cocoon from the two triangular cross-section of the monofilament fibers bonded together in parallel.
This monofilament is silk fibroin fiber，and the adhesive material as the external silk protein. Monofilament contains 18 kinds of amino acids and proteins，is a natural porosity of the fiber，with better than other fiberhygroscopicity.
幼蚕要变成蛹并最终化为成虫，蚕茧成为了蛹的保护层。此外，蚕体内若有氨基酸过多也会使蚕中毒，所以，蚕体吐丝结茧是一种适应环境获得生存的本能。一只蚕要花费约3天的时间，连续吐出1000多米的丝，才能结成一个蚕茧。
以一张蚕种为单位，一张蚕种一般可养18000头蚕。
一张春蚕要消耗约700KG的桑叶。
一张蚕种结的茧，以一个蚕茧（鲜茧）重2g为标准，除去损耗，产茧量约为35000g。
一条90*90的丝巾用丝为80g大约用450个茧。
一件衣服用丝约为200g大约用1200个茧。
纺织纤维按其来源分为天然纤维和化学纤维，天然纤维是指自然界中生长或形成的纤维，根据它的生物属性可分为植物纤维、动物纤维和矿物纤维，蚕丝属于动物纤维，而化学纤维则是通过化学和机械的方法合成的。
在显微镜下，一根茧丝由两根截面呈三角形的单丝纤维平行粘合而成。这单丝纤维就是丝素蛋白，而外围的粘合物质称为丝绸蛋白。单丝含有18种氨基酸及蛋白质，是一种天然多孔性的纤维，具有比其他纤维更佳的吸湿性、透气性及散热性等特征，穿着舒服，光泽高贵，被誉为纤维皇后。
不同地区生产的蚕茧，体形各有不同，色彩也有差异。中国系蚕茧多为椭圆形、球形、卵形和纺锤形，日本系蚕茧为椭圆深束腰形，欧洲系蚕茧长椭圆浅束腰形。茧色多为白色，也有黄色，绿色等。利用生物技术，人们已培育出结彩色茧的优良蚕品种。
