Trong quan ni\u1ec7m c\u1ee7a m\u1ecdi ng\u01b0\u1eddi, gi\u1ea5y v\u1eeba m\u1ecfng v\u1eeba m\u1ec1m kh\u00f4ng ch\u1ecbu \u0111\u01b0\u1ee3c n\u01b0\u1edbc, kh\u00f4ng ch\u1ecbu \u0111\u01b0\u1ee3c l\u1eeda. M\u1ed9t v\u1eadt li\u1ec7u “y\u1ebfu \u1edbt” nh\u01b0 v\u1eady l\u1ea1i c\u00f3 th\u1ec3 d\u00f9ng \u0111\u1ec3 l\u00e0m nh\u00e0 \u0111\u01b0\u1ee3c sao?<\/p>\n\n\n\n
Th\u1ef1c ra, gi\u1ea5y d\u00f9ng \u0111\u1ec3 l\u00e0m nh\u00e0 kh\u00f4ng ph\u1ea3i l\u00e0 lo\u1ea1i gi\u1ea5y th\u00f4ng th\u01b0\u1eddng d\u00f9ng \u0111\u1ec3 vi\u1ebft, in \u1ea5n v\u00e0 bao g\u00f3i, m\u00e0 l\u00e0 m\u1ed9t lo\u1ea1i gi\u1ea5y t\u1ed5ng h\u1ee3p r\u1ea5t m\u1edbi m\u1ebb. Nguy\u00ean li\u1ec7u l\u00e0m lo\u1ea1i gi\u1ea5y n\u00e0y kh\u00f4ng ph\u1ea3i l\u00e0 xenlul\u00f4 thi\u00ean nhi\u00ean m\u00e0 l\u00e0 b\u1eb1ng nh\u1ef1a t\u1ed5ng h\u1ee3p, do \u0111\u00f3 r\u1ea5t nhi\u1ec1u t\u00ednh ch\u1ea5t nh\u01b0 \u0111\u1ed9 b\u1ec1n, \u0111\u1ed9 d\u1ebbo dai, t\u00ednh ch\u1ecbu n\u01b0\u1edbc, ch\u1ecbu b\u1ebb g\u00e3y, ch\u1ecbu \u00e1nh s\u00e1ng, ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 ch\u1ecbu \u0103n m\u00f2n, \u0111\u1ec1u cao h\u01a1n r\u1ea5t nhi\u1ec1u so v\u1edbi gi\u1ea5y th\u00f4ng th\u01b0\u1eddng. V\u1ec1 b\u1ea3n ch\u1ea5t m\u00e0 n\u00f3i, gi\u1ea5y t\u1ed5ng h\u1ee3p tr\u00ean th\u1ef1c t\u1ebf l\u00e0 m\u1ed9t m\u00e0ng m\u1ecfng c\u00f3 h\u00ecnh th\u1ee9c v\u00e0 ch\u1ee9c n\u0103ng (nh\u01b0 \u0111\u1ec3 vi\u1ebft, in \u1ea5n) nh\u01b0 t\u1edd gi\u1ea5y.<\/p>\n\n\n\n
Sau nh\u1eefng n\u0103m 70 c\u1ee7a th\u1ebf k\u1ef7 XX, \u1edf n\u01b0\u1edbc ngo\u00e0i xu\u1ea5t hi\u1ec7n nh\u1eefng ng\u00f4i nh\u00e0 l\u00e0m b\u1eb1ng gi\u1ea5y. T\u01b0\u1eddng v\u00e1ch c\u1ee7a lo\u1ea1i n\u00e0y l\u00e0 nh\u1eefng t\u1ea5m b\u00eca ki\u1ec3u nhi\u1ec1u l\u1edbp ho\u1eb7c c\u00f3 d\u1ea1ng l\u01b0\u1ee3n s\u00f3ng \u0111\u00e3 \u0111\u01b0\u1ee3c x\u1eed l\u00fd \u0111\u1eb7c bi\u1ec7t, chi\u1ec1u d\u00e0y kho\u1ea3ng 5 cm. B\u00ean ngo\u00e0i t\u1ea5m b\u00eca c\u00f3 s\u1ee3i thu\u1ef7 tinh v\u00e0 nh\u1ef1a t\u1ed5ng h\u1ee3p, khi\u1ebfn cho c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a n\u00f3 v\u01b0\u1ee3t xa so v\u1edbi t\u1ea5m v\u00e1n g\u1ed7 c\u00f3 c\u00f9ng chi\u1ec1u d\u00e0y, h\u01a1n n\u1eefa c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u1ef1ng \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 cao, m\u1ed1i m\u1ecdt v\u00e0 th\u1ea5m n\u01b0\u1edbc. C\u00e1c nh\u00e0 khoa h\u1ecdc c\u00f2n b\u00f4i v\u00e0o kho\u1ea3ng gi\u1eefa t\u1ea5m b\u00eca m\u1ed9t l\u1edbp nh\u1ef1a polyamon, d\u00f9ng l\u00e0m v\u00e1ch t\u01b0\u1eddng, t\u00ednh gi\u1eef nhi\u1ec7t c\u00e1ch nhi\u1ec7t c\u00f2n t\u1ed1t h\u01a1n c\u1ea3 t\u01b0\u1eddng g\u1ea1ch; b\u00ean trong gi\u1ea5y t\u1ed5ng h\u1ee3p ng\u01b0\u1eddi ta cho v\u00e0o m\u1ed9t ho\u00e1 ch\u1ea5t c\u00f3 m\u00f9i th\u01a1m kh\u00f4ng nh\u1eefng t\u1ef7 tr\u1ecdng nh\u1eb9 m\u00e0 c\u00f2n c\u00f3 t\u00ednh c\u00e1ch \u0111i\u1ec7n r\u1ea5t t\u1ed1t, \u0111i\u1ec3m n\u00f3ng ch\u1ea3y c\u0169ng cao \u0111\u1ebfn 400oC tr\u1edf l\u00ean. Sau khi cho l\u01b0u hu\u1ef3nh v\u00e0o v\u1eadt li\u1ec7u l\u00e0m b\u00eca gi\u1ea5y, th\u00ec c\u00f3 th\u1ec3 t\u0103ng c\u01b0\u1eddng \u0111\u1ed9, h\u01a1n n\u1eefa c\u00f2n t\u0103ng t\u00ednh ch\u1ed1ng th\u1ea5m n\u01b0\u1edbc. Gi\u1ea5y t\u1ed5ng h\u1ee3p nhi\u1ec1u l\u1edbp l\u00e0m b\u1eb1ng v\u1eadt li\u1ec7u etylen, gi\u1ea5y th\u00f4ng th\u01b0\u1eddng v\u00e0 t\u1ea5m nh\u00f4m m\u1ecfng, c\u00f3 t\u00ednh gi\u1eef nhi\u1ec7t r\u1ea5t t\u1ed1t, d\u00f9ng l\u00e0m v\u00e1ch t\u01b0\u1eddng nh\u00e0, c\u00f3 th\u1ec3 ti\u1ebft ki\u1ec7m 20% l\u01b0\u1ee3ng \u0111i\u1ec7n ti\u00eau th\u1ee5 c\u1ee7a m\u00e1y \u0111i\u1ec1u ho\u00e0 nhi\u1ec7t \u0111\u1ed9\u2026<\/p>\n\n\n\n
M\u1ed9t c\u00f4ng ty ch\u1ebf t\u1ea1o gi\u1ea5y c\u1ee7a M\u1ef9 \u0111\u00e3 l\u00e0m m\u1ed9t “ng\u00f4i nh\u00e0 gi\u1ea5y” di\u1ec7n t\u00edch s\u1eed d\u1ee5ng l\u00e0 6,1 x 6,2 m, tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a ng\u00f4i nh\u00e0 ch\u1ec9 b\u1eb1ng 204 kg. Khi l\u1eafp r\u00e1p, kh\u00f4ng c\u1ea7n d\u00f9ng \u0111inh, bu l\u00f4ng, ch\u1ed1t m\u00e0 ch\u1ec9 c\u1ea7n d\u00e1n b\u1eb1ng keo d\u00e1n, ba c\u00f4ng nh\u00e2n ch\u1ec9 m\u1ea5t n\u0103m gi\u1edd l\u00e0 l\u1eafp xong, sau khi th\u00e1o ra, b\u00eca gi\u1ea5y c\u00f3 th\u1ec3 x\u1ebfp v\u00e0o hai h\u00f2m gi\u1ea5y l\u1edbn, v\u1eadn chuy\u1ec3n r\u1ea5t thu\u1eadn ti\u1ec7n. Ngo\u00e0i ra c\u00f2n c\u00f3 m\u1ed9t lo\u1ea1i nh\u00e0 b\u1eb1ng gi\u1ea5y ch\u1ebf t\u1ea1o b\u1eb1ng nh\u1ef1a polyamon, k\u1ebft c\u1ea5u v\u1ecf ngo\u00e0i c\u1ee7a n\u00f3 g\u1ea5p x\u1ebfp th\u00e0nh h\u00ecnh tr\u01b0\u1edbc, qu\u00e1 tr\u00ecnh “l\u00e0m nh\u00e0” h\u1ebft s\u1ee9c \u0111\u01a1n gi\u1ea3n, ch\u1ec9 c\u1ea7n t\u1eeb t\u1eeb k\u00e9o nh\u00e0 gi\u1ea5y ra nh\u01b0 k\u00e9o \u0111\u00e0n accooc\u0111\u00eaon l\u00e0 \u0111\u01b0\u1ee3c. \u0110\u01b0\u01a1ng nhi\u00ean, khi v\u1eadn chuy\u1ec3n c\u0169ng ch\u1ec9 x\u1ebfp l\u1ea1i, l\u00e0 c\u00f3 th\u1ec3 cho l\u00ean xe ch\u1edf \u0111i.<\/p>\n\n\n\n
Theo t\u00ednh to\u00e1n, tu\u1ed5i th\u1ecd s\u1eed d\u1ee5ng c\u1ee7a nh\u00e0 gi\u1ea5y c\u00f3 th\u1ec3 k\u00e9o d\u00e0i tr\u00ean 10 n\u0103m. L\u00e0m nh\u00e0 gi\u1ea5y d\u1ec5 d\u00e0ng, gi\u00e1 th\u00e0nh r\u1ea5t r\u1ebb, r\u1ea5t th\u00edch h\u1ee3p cho nh\u1eefng ng\u01b0\u1eddi l\u00e0m vi\u1ec7c \u1edf l\u00e2m tr\u01b0\u1eddng, \u1edf khu ch\u0103n nu\u00f4i ho\u1eb7c \u0111i d\u00e3 ngo\u1ea1i, c\u0169ng c\u00f3 th\u1ec3 d\u00f9ng l\u00e0m kho t\u1ea1m, ki\u1ed1t b\u00e1n h\u00e0ng, khi g\u1eb7p c\u00e1c tai ho\u1ea1 thi\u00ean nhi\u00ean nh\u01b0 l\u0169 l\u1ee5t, \u0111\u1ed9ng \u0111\u1ea5t, v.v. c\u00f2n c\u00f3 th\u1ec3 d\u00f9ng nh\u00e0 gi\u1ea5y \u0111\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 nh\u00e0 \u1edf t\u1ea1m th\u1eddi.<\/p>\n\n\n\n
T\u1eeb kh\u00f3a: Nh\u00e0 gi\u1ea5y; Gi\u1ea5y t\u1ed5ng h\u1ee3p.<\/p>\n","protected":false},"excerpt":{"rendered":"
Trong quan ni\u1ec7m c\u1ee7a m\u1ecdi ng\u01b0\u1eddi, gi\u1ea5y v\u1eeba m\u1ecfng v\u1eeba m\u1ec1m kh\u00f4ng ch\u1ecbu \u0111\u01b0\u1ee3c n\u01b0\u1edbc, kh\u00f4ng ch\u1ecbu \u0111\u01b0\u1ee3c l\u1eeda. M\u1ed9t v\u1eadt li\u1ec7u “y\u1ebfu \u1edbt” nh\u01b0 v\u1eady l\u1ea1i c\u00f3 th\u1ec3 d\u00f9ng \u0111\u1ec3 l\u00e0m nh\u00e0 \u0111\u01b0\u1ee3c sao? Th\u1ef1c ra, gi\u1ea5y d\u00f9ng \u0111\u1ec3 l\u00e0m nh\u00e0 kh\u00f4ng ph\u1ea3i l\u00e0 lo\u1ea1i gi\u1ea5y th\u00f4ng th\u01b0\u1eddng d\u00f9ng \u0111\u1ec3 vi\u1ebft, in \u1ea5n v\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":[15,16],"tags":[],"class_list":["post-8963","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-ky-thuat"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8963","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=8963"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8963\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=8963"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=8963"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=8963"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}