{"id":3731,"date":"2026-09-29T11:48:26","date_gmt":"2026-09-29T03:48:26","guid":{"rendered":"http:\/\/0"},"modified":"2026-09-22T17:58:39","modified_gmt":"2026-09-22T09:58:39","slug":"stress-birefringence-molded-optics","status":"publish","type":"post","link":"https:\/\/www.jcinjectionmolding.com\/vi\/blog\/stress-birefringence-molded-optics\/","title":{"rendered":"M\u00e0u \u1ee8ng Su\u1ea5t Ti\u1ebft L\u1ed9 \u0110i\u1ec1u G\u00ec V\u1ec1 Quang H\u1ecdc \u0110\u00fac"},"content":{"rendered":"
\n

L\u01b0\u1ee1ng chi\u1ebft do \u1ee9ng su\u1ea5t l\u00e0 b\u1eb1ng ch\u1ee9ng cho th\u1ea5y m\u1ed9t polymer trong su\u1ed1t kh\u00f4ng c\u00f2n h\u00e0nh x\u1eed quang h\u1ecdc gi\u1ed1ng nhau theo m\u1ecdi h\u01b0\u1edbng. N\u00f3 c\u00f3 th\u1ec3 xu\u1ea5t ph\u00e1t t\u1eeb \u0111\u1ecbnh h\u01b0\u1edbng d\u00f2ng ch\u1ea3y, \u0111\u00f3ng g\u00f3i kh\u00f4ng \u0111\u1ec1u, l\u00e0m ngu\u1ed9i kh\u00f4ng \u0111\u1ed3ng nh\u1ea5t, l\u1ef1c \u0111\u1ea9y ph\u00f4i ho\u1eb7c t\u1ea3i tr\u1ecdng l\u1eafp r\u00e1p. Hoa v\u0103n m\u00e0u gi\u1eefa c\u00e1c k\u00ednh ph\u00e2n c\u1ef1c ch\u00e9o r\u1ea5t h\u1eefu \u00edch, nh\u01b0ng b\u1ea3n th\u00e2n n\u00f3 kh\u00f4ng x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c nguy\u00ean nh\u00e2n. Vi\u1ec7c ch\u1ea9n \u0111o\u00e1n ph\u1ee5 thu\u1ed9c v\u00e0o th\u1eddi \u0111i\u1ec3m hoa v\u0103n xu\u1ea5t hi\u1ec7n, v\u1ecb tr\u00ed n\u00f3 th\u1eb3ng h\u00e0ng v\u1edbi d\u00f2ng ch\u1ea3y v\u00e0 c\u00e1ch n\u00f3 thay \u0111\u1ed5i sau khi \u0111\u00fac.<\/p>\n

\n

\u0110\u1ecdc hoa v\u0103n theo th\u1eddi gian:<\/strong> so s\u00e1nh chi ti\u1ebft ngay sau khi \u0111\u00fac, sau khi \u1ed5n \u0111\u1ecbnh, sau c\u00e1c th\u1eed nghi\u1ec7m \u1ee7 v\u00e0 sau khi l\u1eafp r\u00e1p. Nh\u1eefng thay \u0111\u1ed5i gi\u1eefa c\u00e1c tr\u1ea1ng th\u00e1i \u0111\u00f3 ph\u00e2n bi\u1ec7t \u0111\u1ecbnh h\u01b0\u1edbng d\u00f2ng ch\u1ea3y b\u1ecb \u0111\u00f3ng b\u0103ng v\u1edbi t\u1ea3i nhi\u1ec7t v\u00e0 t\u1ea3i c\u01a1.<\/p>\n<\/div>\n

Trong b\u00e0i vi\u1ebft n\u00e0y:<\/strong><\/p>\n

    \n
  1. Hi\u1ec3u \u00fd ngh\u0129a c\u1ee7a c\u00e1c m\u00e0u s\u1eafc<\/a><\/li>\n
  2. \u00c1nh x\u1ea1 hoa v\u0103n v\u1edbi l\u1ecbch s\u1eed qu\u00e1 tr\u00ecnh<\/a><\/li>\n
  3. T\u00e1ch \u1ee9ng su\u1ea5t \u0111\u00fac kh\u1ecfi \u1ee9ng su\u1ea5t l\u1eafp r\u00e1p<\/a><\/li>\n
  4. Gi\u1ea3m \u0111\u00fang ngu\u1ed3n g\u00e2y ra<\/a><\/li>\n
  5. Vi\u1ebft m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p nghi\u1ec7m thu kh\u1ea3 d\u1ee5ng<\/a><\/li>\n
  6. C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/a><\/li>\n<\/ol>\n

    M\u00e0u ph\u00e2n c\u1ef1c th\u1ef1c s\u1ef1 cho th\u1ea5y \u0111i\u1ec1u g\u00ec<\/h2>\n

    \"polarized-retardation-pattern-in-clear-polymer\"<\/p>\n

    Trong m\u1ed9t v\u1eadt li\u1ec7u \u0111\u1eb3ng h\u01b0\u1edbng kh\u00f4ng ch\u1ecbu \u1ee9ng su\u1ea5t, \u00e1nh s\u00e1ng v\u1ec1 c\u01a1 b\u1ea3n th\u1ea5y c\u00f9ng m\u1ed9t h\u00e0nh vi kh\u00fac x\u1ea1 theo c\u00e1c h\u01b0\u1edbng kh\u00e1c nhau. \u0110\u1ecbnh h\u01b0\u1edbng v\u00e0 \u1ee9ng su\u1ea5t t\u1ea1o ra s\u1ef1 kh\u00e1c bi\u1ec7t theo h\u01b0\u1edbng. Gi\u1eefa c\u00e1c k\u00ednh ph\u00e2n c\u1ef1c ch\u00e9o, nh\u1eefng kh\u00e1c bi\u1ec7t \u0111\u00f3 xu\u1ea5t hi\u1ec7n d\u01b0\u1edbi d\u1ea1ng \u0111\u1ed9 s\u00e1ng v\u00e0 m\u00e0u s\u1eafc li\u00ean quan \u0111\u1ebfn \u0111\u1ed9 tr\u1ec5 quang h\u1ecdc, \u0111\u1ed9 d\u00e0y chi ti\u1ebft v\u00e0 b\u01b0\u1edbc s\u00f3ng.<\/p>\n

    \u0110\u00f3 l\u00e0 l\u00fd do v\u00ec sao m\u1ed9t m\u00e0u s\u00e1ng kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh m\u1ed9t gi\u00e1 tr\u1ecb \u1ee9ng su\u1ea5t ph\u1ed5 qu\u00e1t n\u1ebfu kh\u00f4ng c\u00f3 ph\u01b0\u01a1ng ph\u00e1p x\u00e1c \u0111\u1ecbnh v\u00e0 m\u1ed1i quan h\u1ec7 v\u1eadt li\u1ec7u c\u1ee5 th\u1ec3. M\u1ed9t v\u00f9ng d\u00e0y h\u01a1n c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb hoa v\u0103n m\u1ea1nh h\u01a1n so v\u1edbi v\u00f9ng m\u1ecfng d\u01b0\u1edbi tr\u1ea1ng th\u00e1i \u1ee9ng su\u1ea5t t\u01b0\u01a1ng t\u1ef1. H\u00e3y d\u00f9ng ph\u01b0\u01a1ng ph\u00e1p ph\u00e2n c\u1ef1c quang \u0111\u1ec3 so s\u00e1nh c\u00e1c h\u00ecnh d\u1ea1ng gi\u1ed1ng nhau trong c\u00f9ng \u0111i\u1ec1u ki\u1ec7n.<\/p>\n

    \u00c1nh x\u1ea1 hoa v\u0103n tr\u1edf l\u1ea1i d\u00f2ng ch\u1ea3y v\u00e0 l\u00e0m ngu\u1ed9i<\/h2>\n

    M\u1ed9t hoa v\u0103n t\u1eadp trung g\u1ea7n c\u1ed5ng c\u00f3 th\u1ec3 cho th\u1ea5y l\u1ef1c c\u1eaft cao ho\u1eb7c \u0111\u00f3ng g\u00f3i m\u1ea1nh. C\u00e1c d\u1ea3i ch\u1ea1y theo h\u01b0\u1edbng d\u00f2ng ch\u1ea3y c\u00f3 th\u1ec3 ph\u1ea3n \u00e1nh \u0111\u1ecbnh h\u01b0\u1edbng b\u1ecb \u0111\u00f3ng b\u0103ng. M\u1ed9t \u0111\u01b0\u1eddng n\u01a1i c\u00e1c m\u1eb7t tr\u01b0\u1edbc d\u00f2ng ch\u1ea3y g\u1eb7p nhau ch\u1ec9 ra l\u1ecbch s\u1eed \u0111\u01b0\u1eddng h\u00e0n. Hoa v\u0103n \u1edf m\u00e9p c\u00f3 th\u1ec3 \u0111\u1ebfn t\u1eeb vi\u1ec7c l\u00e0m ngu\u1ed9i l\u1edbp da nhanh, \u0111\u00f3ng g\u00f3i qu\u00e1 m\u1ee9c ho\u1eb7c b\u1ecb r\u00e0ng bu\u1ed9c v\u1edbi l\u00f2ng khu\u00f4n.<\/p>\n

    H\u00e3y so s\u00e1nh c\u00e1c m\u1eabu b\u1eafn thi\u1ebfu v\u1edbi chi ti\u1ebft cu\u1ed1i c\u00f9ng \u0111\u1ec3 hoa v\u0103n c\u00f3 l\u1ecbch s\u1eed \u0111i\u1ec1n \u0111\u1ea7y. T\u00e1ch ri\u00eang c\u00e1c l\u00f2ng khu\u00f4n v\u00e0 ghi l\u1ea1i nhi\u1ec7t \u0111\u1ed9 n\u00f3ng ch\u1ea3y, nhi\u1ec7t \u0111\u1ed9 khu\u00f4n, bi\u00ean d\u1ea1ng \u0111i\u1ec1n \u0111\u1ea7y, v\u1ecb tr\u00ed chuy\u1ec3n ti\u1ebfp, \u00e1p su\u1ea5t gi\u1eef v\u00e0 th\u1eddi gian l\u00e0m ngu\u1ed9i. N\u1ebfu kh\u00f4ng c\u00f3 nh\u1eefng ghi ch\u00e9p \u0111\u00f3, m\u1ed9t h\u00ecnh \u1ea3nh ph\u00e2n c\u1ef1c ch\u1ec9 l\u00e0 b\u1ee9c \u1ea3nh c\u1ee7a m\u1ed9t tri\u1ec7u ch\u1ee9ng ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t bi\u1ec7n ph\u00e1p ki\u1ec3m so\u00e1t k\u1ef9 thu\u1eadt.<\/p>\n

    \u1ee8ng su\u1ea5t \u0111\u00fac v\u00e0 \u1ee9ng su\u1ea5t l\u1eafp r\u00e1p c\u00f3 th\u1ec3 tr\u00f4ng gi\u1ed1ng nhau<\/h2>\n

    \"loose-and-assembled-optic-stress-comparison\"<\/p>\n

    Ki\u1ec3m tra chi ti\u1ebft r\u1eddi tr\u01b0\u1edbc, sau \u0111\u00f3 l\u1eb7p l\u1ea1i sau khi k\u1eb9p, v\u00edt, keo \u0111\u00f3ng r\u1eafn ho\u1eb7c \u00e9p l\u1eafp. N\u1ebfu m\u1ed9t h\u00ecnh d\u1ea1ng m\u1edbi xu\u1ea5t hi\u1ec7n g\u1ea7n \u0111i\u1ec3m gi\u1eef, c\u1ee5m l\u1eafp \u0111ang t\u00e1c \u0111\u1ed9ng l\u1ef1c l\u00ean chi ti\u1ebft quang h\u1ecdc. M\u1ed9t h\u00ecnh d\u1ea1ng \u0111\u00fac s\u1eb5n v\u1eabn gi\u1eef nguy\u00ean v\u1ecb tr\u00ed qua c\u00e1c c\u1ee5m l\u1eafp kh\u00e1c nhau ch\u1ec9 ra nguy\u00ean nh\u00e2n t\u1eeb c\u1ed5ng phun, qu\u00e1 tr\u00ecnh n\u00e9n, l\u00e0m ngu\u1ed9i ho\u1eb7c \u0111\u1ea9y ra.<\/p>\n

    Th\u1eddi gian r\u1ea5t quan tr\u1ecdng. M\u1ed9t chi ti\u1ebft c\u00f2n \u1ea5m c\u00f3 th\u1ec3 gi\u00e3n ho\u1eb7c bi\u1ebfn d\u1ea1ng sau khi \u0111\u1ea9y ra. C\u00e1c polymer h\u00fat \u1ea9m c\u0169ng c\u00f3 th\u1ec3 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc v\u00e0 tr\u1ea1ng th\u00e1i \u1ee9ng su\u1ea5t trong qu\u00e1 tr\u00ecnh \u1ed5n \u0111\u1ecbnh. Thi\u1ebft l\u1eadp m\u1ed9t kho\u1ea3ng th\u1eddi gian v\u00e0 m\u00f4i tr\u01b0\u1eddng c\u1ed1 \u0111\u1ecbnh tr\u01b0\u1edbc khi so s\u00e1nh c\u00e1c m\u1eabu.<\/p>\n

    Gi\u1ea3m Ngu\u1ed3n G\u1ed1c Thay V\u00ec Che Gi\u1ea5u M\u00e0u S\u1eafc<\/h2>\n

    N\u1ebfu l\u1ef1c c\u1eaft t\u1ea1i c\u1ed5ng phun chi\u1ebfm \u01b0u th\u1ebf, h\u00e3y so s\u00e1nh m\u1ed9t l\u1ed1i v\u00e0o \u00edt c\u1ea3n tr\u1edf h\u01a1n ho\u1eb7c m\u1ed9t bi\u00ean d\u1ea1ng \u0111i\u1ec1n \u0111\u1ea7y tr\u00e1nh gia t\u1ed1c kh\u00f4ng c\u1ea7n thi\u1ebft. N\u1ebfu n\u00e9n qu\u00e1 m\u1ee9c chi\u1ebfm \u01b0u th\u1ebf, x\u00e1c nh\u1eadn c\u1ed5ng phun \u0111\u00f4ng \u0111\u1eb7c v\u00e0 gi\u1ea3m \u00e1p su\u1ea5t sau khi \u0111i\u1ec1n \u0111\u1ea7y theo th\u1ec3 t\u00edch. N\u1ebfu l\u00e0m ngu\u1ed9i kh\u00f4ng \u0111\u1ed1i x\u1ee9ng, \u0111i\u1ec1u ch\u1ec9nh l\u01b0u l\u01b0\u1ee3ng n\u01b0\u1edbc, ti\u1ebfp x\u00fac ch\u00e8n ho\u1eb7c nhi\u1ec7t \u0111\u1ed9 th\u00e9p. N\u1ebfu \u0111\u1ea9y ra l\u00e0m cong chi ti\u1ebft, c\u1ea3i thi\u1ec7n \u0111\u1ed9 tho\u00e1t khu\u00f4n v\u00e0 ph\u00e2n b\u1ed1 l\u1ef1c gi\u1ea3i ph\u00f3ng.<\/p>\n

    \u1ee6 nhi\u1ec7t c\u00f3 th\u1ec3 gi\u1ea3m m\u1ed9t s\u1ed1 \u1ee9ng su\u1ea5t d\u01b0, nh\u01b0ng n\u00f3 t\u1ed1n th\u1eddi gian v\u00e0 c\u00f3 th\u1ec3 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc. N\u00f3 kh\u00f4ng n\u00ean tr\u1edf th\u00e0nh bi\u1ec7n ph\u00e1p thay th\u1ebf th\u01b0\u1eddng quy cho m\u1ed9t khu\u00f4n ho\u1eb7c quy tr\u00ecnh kh\u00f4ng \u1ed5n \u0111\u1ecbnh. Trong \u00c9p phun quang h\u1ecdc & trong su\u1ed1t<\/a>, ph\u1ea1m vi, ki\u1ec3m so\u00e1t \u01b0u ti\u00ean l\u00e0 m\u1ed9t quy tr\u00ecnh \u1ed5n \u0111\u1ecbnh gi\u1eef \u0111\u1ed9 tr\u1ec5 d\u01b0\u1edbi gi\u1edbi h\u1ea1n ch\u1ee9c n\u0103ng c\u1ee7a s\u1ea3n ph\u1ea9m tr\u01b0\u1edbc khi x\u1eed l\u00fd th\u1ee9 c\u1ea5p.<\/p>\n

    M\u1ed9t \u0110\u1eb7c T\u00ednh \u1ee8ng Su\u1ea5t C\u1ea7n M\u1ed9t C\u1ea5u H\u00ecnh Ki\u1ec3m Tra<\/h2>\n

    \"repeatable-polariscope-inspection-fixture\"<\/p>\n

    N\u00eau r\u00f5 c\u00e1ch b\u1ed1 tr\u00ed k\u00ednh ph\u00e2n c\u1ef1c, b\u01b0\u1edbc s\u00f3ng ho\u1eb7c ngu\u1ed3n s\u00e1ng, h\u01b0\u1edbng chi ti\u1ebft, h\u01b0\u1edbng quan s\u00e1t, n\u1ec1n, c\u00e0i \u0111\u1eb7t camera, \u0111i\u1ec1u ki\u1ec7n \u1ed5n \u0111\u1ecbnh v\u00e0 v\u00f9ng ki\u1ec3m tra. X\u00e1c \u0111\u1ecbnh li\u1ec7u vi\u1ec7c ch\u1ea5p nh\u1eadn s\u1eed d\u1ee5ng \u1ea3nh tham chi\u1ebfu, b\u1eadc v\u00e2n giao thoa, gi\u00e1 tr\u1ecb \u0111\u1ed9 tr\u1ec5 hay hi\u1ec7u su\u1ea5t quang h\u1ecdc c\u1ea5p s\u1ea3n ph\u1ea9m.<\/p>\n

    G\u1eafn ti\u00eau ch\u00ed v\u1edbi ch\u1ee9c n\u0103ng. M\u1ed9t n\u1eafp trong su\u1ed1t trang tr\u00ed c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn c\u00e1c h\u00ecnh d\u1ea1ng s\u1ebd g\u00e2y nhi\u1ec5u m\u00e0n h\u00ecnh ph\u00e2n c\u1ef1c, c\u1ea3m bi\u1ebfn ho\u1eb7c h\u1ec7 th\u1ed1ng h\u00ecnh \u1ea3nh. C\u00f9ng m\u1ed9t ngo\u1ea1i quan \u0111\u00fac kh\u00f4ng t\u1ea1o ra c\u00f9ng m\u1ed9t r\u1ee7i ro s\u1ea3n ph\u1ea9m.<\/p>\n

    T\u01b0\u01a1ng quan m\u00e0n h\u00ecnh v\u1edbi hi\u1ec7u su\u1ea5t s\u1ea3n ph\u1ea9m<\/h3>\n

    Trong qu\u00e1 tr\u00ecnh \u0111\u1ee7 \u0111i\u1ec1u ki\u1ec7n, ki\u1ec3m tra c\u00e1c chi ti\u1ebft tr\u1ea3i r\u1ed9ng t\u1eeb ph\u1ea3n h\u1ed3i \u00e1nh s\u00e1ng ph\u00e2n c\u1ef1c th\u1ea5p, trung b\u00ecnh v\u00e0 cao trong c\u1ee5m quang h\u1ecdc th\u1ef1c t\u1ebf. S\u1ef1 t\u01b0\u01a1ng quan \u0111\u00f3 cho th\u1ea5y li\u1ec7u gi\u1edbi h\u1ea1n s\u00e0ng l\u1ecdc b\u1ea3o v\u1ec7 s\u1ea3n ph\u1ea9m hay ch\u1ec9 t\u1ea1o ra nh\u1eefng h\u00ecnh \u1ea3nh h\u1ea5p d\u1eabn. Gi\u1eef l\u1ea1i c\u00e1c m\u1eabu bi\u00ean trong \u0111i\u1ec1u ki\u1ec7n b\u1ea3o qu\u1ea3n c\u00f3 ki\u1ec3m so\u00e1t v\u00e0 l\u1eb7p l\u1ea1i t\u01b0\u01a1ng quan sau khi thay \u0111\u1ed5i v\u1eadt li\u1ec7u ho\u1eb7c d\u1ee5ng c\u1ee5.<\/p>\n

    Khi y\u00eau c\u1ea7u \u0111\u00e1nh gi\u00e1 \u0111\u00fac, cung c\u1ea5p c\u1ea5p nh\u1ef1a, b\u1ea3n \u0111\u1ed3 \u0111\u1ed9 d\u00e0y, v\u1ecb tr\u00ed c\u1ed5ng phun, c\u1ea5u h\u00ecnh k\u00ednh ph\u00e2n c\u1ef1c, m\u00f4-men xo\u1eafn ho\u1eb7c \u0111\u1ed9 giao thoa l\u1eafp r\u00e1p v\u00e0 tri\u1ec7u ch\u1ee9ng quang h\u1ecdc. M\u1ed9t b\u1ee9c \u1ea3nh nhi\u1ec1u m\u00e0u s\u1eafc duy nh\u1ea5t kh\u00f4ng c\u00f3 b\u1ed1i c\u1ea3nh n\u00e0y hi\u1ebfm khi ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c \u0111\u1ecbnh h\u01b0\u1edbng d\u00f2ng ch\u1ea3y v\u1edbi \u1ee9ng su\u1ea5t c\u01a1 h\u1ecdc sau \u0111\u00f3.<\/p>\n

    S\u1eed d\u1ee5ng thay \u0111\u1ed5i quy tr\u00ecnh nh\u01b0 c\u00e1c th\u00ed nghi\u1ec7m c\u00f3 ki\u1ec3m so\u00e1t<\/h3>\n

    Khi th\u1eed nghi\u1ec7m m\u1ed9t s\u1eeda ch\u1eefa, thay \u0111\u1ed5i t\u1eebng c\u01a1 ch\u1ebf m\u1ed9t v\u00e0 so s\u00e1nh c\u00f9ng m\u1ed9t khoang. \u0110i\u1ec1n ch\u1eadm h\u01a1n, khu\u00f4n \u1ea5m h\u01a1n v\u00e0 n\u00e9n th\u1ea5p h\u01a1n \u00e1p d\u1ee5ng c\u00f9ng nhau c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n h\u00ecnh \u1ea3nh nh\u01b0ng kh\u00f4ng ti\u1ebft l\u1ed9 y\u1ebfu t\u1ed1 ki\u1ec3m so\u00e1t n\u00e0o quan tr\u1ecdng. X\u00e1c nh\u1eadn t\u1eebng y\u1ebfu t\u1ed1 ri\u00eang l\u1ebb t\u1ea1o ra m\u1ed9t c\u00e0i \u0111\u1eb7t c\u00f3 th\u1ec3 gi\u00e1m s\u00e1t v\u00e0 kh\u00f4i ph\u1ee5c sau n\u00e0y.<\/p>\n

    Ki\u1ec3m tra c\u00e1c \u0111\u00e1nh \u0111\u1ed5i sau khi h\u00ecnh d\u1ea1ng \u1ee9ng su\u1ea5t \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n. N\u00e9n th\u1ea5p h\u01a1n c\u00f3 th\u1ec3 l\u00e0m t\u0103ng v\u1ebft l\u00f5m ho\u1eb7c bi\u1ebfn thi\u00ean k\u00edch th\u01b0\u1edbc; l\u00e0m ngu\u1ed9i l\u00e2u h\u01a1n c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n vi\u1ec7c th\u00e1o khu\u00f4n nh\u01b0ng t\u0103ng chi ph\u00ed; nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n sao ch\u00e9p trong khi t\u0103ng r\u1ee7i ro l\u01b0u tr\u00fa. Quy tr\u00ecnh \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn ph\u1ea3i \u0111\u00e1p \u1ee9ng \u0111\u1ed3ng th\u1eddi c\u00e1c y\u00eau c\u1ea7u quang h\u1ecdc, k\u00edch th\u01b0\u1edbc v\u00e0 s\u1ea3n xu\u1ea5t.<\/p>\n

    C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n

    \"engineers-discussing-polarized-stress-samples\"<\/p>\n

    Does birefringence mean the part will crack?<\/h3>\n

    Not necessarily. It shows optical anisotropy associated with orientation or stress. Crack risk also depends on material, stress magnitude, notches, chemicals, temperature and time.<\/p>\n

    Can lower injection speed remove it?<\/h3>\n

    Sometimes, but a slower fill can create a colder flow front and other defects. Evaluate speed together with melt and mold temperature, gate design and pressure transfer.<\/p>\n

    Why does the pattern change after assembly?<\/h3>\n

    Clips, screws, interference, adhesive shrinkage or housing warp can impose new stress. Inspect both loose and assembled conditions.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

    Stress birefringence is evidence that a transparent polymer no longer behaves optically the same in every direction. It can come from flow orientation, uneven packing, nonuniform cooling, forced ejection or assembly load. The colored pattern between crossed polarizers is useful, but it does not identify the cause by itself. Diagnosis depends on when the pattern […]<\/p>\n","protected":false},"author":1,"featured_media":3797,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3731","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/posts\/3731","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/comments?post=3731"}],"version-history":[{"count":0,"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/posts\/3731\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/media\/3797"}],"wp:attachment":[{"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/media?parent=3731"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/categories?post=3731"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jcinjectionmolding.com\/vi\/wp-json\/wp\/v2\/tags?post=3731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}