V\u1ec1 th\u00e0nh ph\u1ea7n ho\u00e1 h\u1ecdc, b\u00f4ng v\u1ea3i ch\u00ednh l\u00e0 xenluloza, l\u00e0 m\u1ed9t cao ph\u00e2n t\u1eed thi\u00ean nhi\u00ean. Khi \u0111em b\u00f4ng v\u1ea3i k\u00e9o th\u00e0nh s\u1ee3i, r\u1ed3i d\u1ec7t b\u1eb1ng s\u1ee3i ngang s\u1ee3i d\u1ecdc (s\u1ee3i canh v\u00e0 s\u1ee3i ch\u1ec9) ng\u01b0\u1eddi ta s\u1ebd thu \u0111\u01b0\u1ee3c v\u1ea3i, c\u00f3 \u0111\u1ed9 b\u1ec1n nh\u1ea5t \u0111\u1ecbnh. Gi\u1ea5y c\u0169ng c\u00f3 th\u00e0nh ph\u1ea7n ho\u00e1 h\u1ecdc l\u00e0 xenluloza, c\u0169ng \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t b\u1eb1ng c\u00e1c lo\u1ea1i th\u1ef1c v\u1eadt c\u00f3 s\u1ee3i nh\u01b0 g\u1ed7, r\u01a1m r\u1ea1, lau l\u00e1ch, r\u1ed3i ch\u1ebf t\u1ea1o th\u00e0nh l\u1edbp m\u1ecfng ta c\u00f3 gi\u1ea5y. \u0110i\u1ec1u n\u00e0y c\u0169ng r\u1ea5t gi\u1ed1ng v\u1edbi lo\u1ea1i v\u1ea3i kh\u00f4ng d\u1ec7t. Th\u1ebf t\u1ea1i sao v\u1ea3i kh\u00f4ng d\u1ec7t l\u1ea1i kh\u00f4ng ph\u1ea3i l\u00e0 gi\u1ea5y?<\/p>\n\n\n\n
Tuy gi\u1ea5y v\u00e0 v\u1ea3i kh\u00f4ng s\u1ee3i d\u1ec7t c\u00f9ng l\u00e0 phi\u1ebfn m\u1ecfng xenluloza nh\u01b0ng trong c\u00f4ng ngh\u1ec7 ch\u1ebf t\u1ea1o gi\u1ea5y v\u00e0 v\u1ea3i kh\u00f4ng s\u1ee3i d\u1ec7t c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t.<\/p>\n\n\n\n
\u0110\u1ec3 s\u1ea3n xu\u1ea5t gi\u1ea5y, ng\u01b0\u1eddi ta ph\u1ea3i bi\u1ebfn nguy\u00ean li\u1ec7u s\u1ee3i th\u1ef1c v\u1eadt th\u00e0nh b\u1ed9t gi\u1ea5y. \u0110\u1ec3 t\u1ea1o n\u00ean b\u1ed9t gi\u1ea5y ng\u01b0\u1eddi ta ph\u1ea3i x\u1eed l\u00fd v\u1eadt li\u1ec7u c\u00f3 s\u1ee3i b\u1eb1ng nhi\u1ec1u lo\u1ea1i ho\u00e1 ch\u1ea5t, qua giai \u0111o\u1ea1n \u0111\u1eadp s\u1ee3i th\u1ef1c v\u1eadt \u0111\u1ec3 ph\u00e1 b\u1ecf l\u1edbp v\u1ecf ngo\u00e0i c\u1ee7a s\u1ee3i, nh\u1edd \u0111\u00f3 c\u00e1c ph\u00e2n t\u1eed cao ph\u00e2n t\u1eed m\u1edbi \u0111\u01b0\u1ee3c gi\u1ea3i ph\u00f3ng, tr\u1ea3i d\u00e0i, sau \u0111\u00f3 qua c\u00e1c giai \u0111o\u1ea1n \u0111\u1ec3 l\u1eafng, \u00e9p ph\u1eb3ng, s\u1ea5y v\u00e0 t\u1ea1o \u0111\u01b0\u1ee3c gi\u1ea5y. Ph\u00e2n t\u1eed cao ph\u00e2n t\u1eed xenluloza r\u1ea5t d\u00e0i, d\u1ecdc theo ph\u00e2n t\u1eed th\u01b0\u1eddng c\u00f3 l\u1ef1c h\u1ea5p d\u1eabn l\u1edbn (do li\u00ean k\u1ebft hy\u0111ro). Sau khi \u0111\u1eadp, c\u00e1c ph\u00e2n t\u1eed xenluloza s\u1ebd du\u1ed7i ra v\u00e0 nh\u1edd c\u00f3 l\u1ef1c h\u1ea5p d\u1eabn s\u1ebd xo\u1eafn l\u1ea1i v\u1edbi nhau n\u00ean gi\u1ea5y c\u00f3 \u0111\u1ed9 dai kh\u00e1 t\u1ed1t. B\u1ed9t gi\u1ea5y c\u00e0ng \u0111\u01b0\u1ee3c \u0111\u1eadp k\u1ef9 th\u00ec s\u1ebd cho gi\u1ea5y c\u00f3 \u0111\u1ed9 m\u1ecbn c\u00e0ng cao, c\u00f3 m\u1eadt \u0111\u1ed9 c\u00e0ng \u0111\u1ed3ng \u0111\u1ec1u. Ch\u00ednh v\u00ec v\u1eady m\u00e0 ng\u01b0\u1eddi ta th\u01b0\u1eddng n\u00f3i “kh\u00f4ng \u0111\u1eadp th\u00ec kh\u00f4ng th\u00e0nh gi\u1ea5y”. Gi\u1ea5y c\u00e0ng m\u1ecbn m\u1eb7t th\u00ec c\u00e0ng kh\u00f3 b\u1ecb h\u01b0 h\u1ecfng (nh\u01b0ng khi g\u1eb7p n\u01b0\u1edbc th\u00ec do li\u00ean k\u1ebft hy\u0111ro gi\u1eefa c\u00e1c ph\u00e2n t\u1eed gi\u1ea5y b\u1ecb ph\u00e1 v\u1ee1 do c\u00e1c ph\u00e2n t\u1eed n\u01b0\u1edbc n\u00ean gi\u1ea5y d\u1ec5 b\u1ecb b\u1ee5c khi g\u1eb7p n\u01b0\u1edbc). C\u00f2n v\u1edbi lo\u1ea1i v\u1ea3i kh\u00f4ng s\u1ee3i d\u1ec7t, sau khi \u0111em v\u1eadt li\u1ec7u s\u1ee3i gia c\u00f4ng th\u00e0nh d\u1ecbch keo ng\u01b0\u1eddi ta \u0111\u1ec3 l\u1eafng, \u00e9p, sau \u0111\u00f3 d\u00f9ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p ho\u00e1 h\u1ecdc, ph\u01b0\u01a1ng ph\u00e1p nhi\u1ec7t\u2026 \u0111\u1ec3 k\u1ebft d\u00ednh c\u00e1c s\u1ee3i v\u1edbi nhau. T\u1eeb t\u00ean g\u1ecdi “v\u1ea3i kh\u00f4ng s\u1ee3i d\u1ec7t” ch\u1ec9 ra r\u1eb1ng lo\u1ea1i v\u1ea3i n\u00e0y \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o kh\u00f4ng qua giai \u0111o\u1ea1n k\u00e9o s\u1ee3i, nh\u01b0ng c\u0169ng kh\u00f4ng qua c\u00e1c giai \u0111o\u1ea1n x\u1eed l\u00fd nh\u01b0 khi s\u1ea3n xu\u1ea5t gi\u1ea5y, n\u00ean v\u1ea3i kh\u00f4ng s\u1ee3i d\u1ec7t kh\u00f4ng ph\u1ea3i l\u00e0 gi\u1ea5y m\u00e0 l\u00e0 v\u1ea3i kh\u00f4ng c\u00f3 s\u1ee3i d\u1ec7t. V\u1ea3i kh\u00f4ng s\u1ee3i d\u1ec7t \u0111\u01b0\u1ee3c d\u00f9ng l\u00e0m v\u1ea3i l\u00f3t, v\u1ea3i d\u00e1n t\u01b0\u1eddng, thay cho v\u1ea3i t\u00e3 l\u00f3t truy\u1ec1n th\u1ed1ng\u2026 Lo\u1ea1i v\u1eadt li\u1ec7u n\u00e0y kh\u00f4ng th\u1ec3 d\u00f9ng \u0111\u1ec3 vi\u1ebft, \u0111\u1ec3 in, kh\u00f4ng d\u00f9ng \u0111\u1ec3 v\u1ebd \u0111\u01b0\u1ee3c\u2026 n\u00ean kh\u00f4ng ph\u1ea3i l\u00e0 gi\u1ea5y.<\/p>\n\n\n\n
Th\u1ef1c s\u1ef1 trong l\u1ecbch s\u1eed v\u0103n minh nh\u00e2n lo\u1ea1i, v\u1ea3i xu\u1ea5t hi\u1ec7n s\u1edbm h\u01a1n gi\u1ea5y r\u1ea5t nhi\u1ec1u. T\u1eeb n\u0103m 1957 ng\u01b0\u1eddi ta \u0111\u00e3 khai qu\u1eadt \u1edf B\u00e1 Ki\u1ec1u thu\u1ed9c th\u00e0nh ph\u1ed1 T\u00e2y An \u0111\u01b0\u1ee3c lo\u1ea1i gi\u1ea5y th\u1eddi T\u00e2y H\u00e1n (th\u1ebf k\u1ef7 th\u1ee9 hai tr\u01b0\u1edbc C\u00f4ng nguy\u00ean). Qua ph\u00e2n t\u00edch ki\u1ec3m nghi\u1ec7m th\u00ec \u0111\u00f3 l\u00e0 gi\u1ea5y ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 v\u1ea3i. Qua ph\u00e1t hi\u1ec7n n\u00e0y cho th\u1ea5y gi\u1ea5y \u0111\u01b0\u1ee3c ph\u00e1t minh c\u00f2n s\u1edbm h\u01a1n so v\u1edbi gi\u1ea5y Th\u00e1i Lu\u00e2n nhi\u1ec1u (n\u0103m 105 C\u00f4ng nguy\u00ean).<\/p>\n\n\n\n
T\u1eeb kho\u00e1: V\u1ea3i kh\u00f4ng s\u1ee3i d\u1ec7t; S\u1ea3n xu\u1ea5t gi\u1ea5y.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
V\u1ec1 th\u00e0nh ph\u1ea7n ho\u00e1 h\u1ecdc, b\u00f4ng v\u1ea3i ch\u00ednh l\u00e0 xenluloza, l\u00e0 m\u1ed9t cao ph\u00e2n t\u1eed thi\u00ean nhi\u00ean. Khi \u0111em b\u00f4ng v\u1ea3i k\u00e9o th\u00e0nh s\u1ee3i, r\u1ed3i d\u1ec7t b\u1eb1ng s\u1ee3i ngang s\u1ee3i d\u1ecdc (s\u1ee3i canh v\u00e0 s\u1ee3i ch\u1ec9) ng\u01b0\u1eddi ta s\u1ebd thu \u0111\u01b0\u1ee3c v\u1ea3i, c\u00f3 \u0111\u1ed9 b\u1ec1n nh\u1ea5t \u0111\u1ecbnh. Gi\u1ea5y c\u0169ng c\u00f3 th\u00e0nh ph\u1ea7n ho\u00e1 h\u1ecdc l\u00e0 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[8,15],"tags":[],"class_list":["post-7882","post","type-post","status-publish","format-standard","hentry","category-hoa-hoc","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7882","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=7882"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7882\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7882"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7882"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}