{"id":8581,"date":"2009-03-24T02:19:04","date_gmt":"2009-03-23T19:19:04","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/2009\/03\/nghien-cuu-cong-nghe-ep-formica-len-mot-mat-san-pham-van-dan\/"},"modified":"2019-09-25T10:22:04","modified_gmt":"2019-09-25T03:22:04","slug":"nghien-cuu-cong-nghe-ep-formica-len-mot-mat-san-pham-van-dan","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/nghien-cuu-cong-nghe-ep-formica-len-mot-mat-san-pham-van-dan\/","title":{"rendered":"Nghi\u00ean c\u1ee9u c\u00f4ng ngh\u1ec7 \u00e9p formica l\u00ean m\u1ed9t m\u1eb7t s\u1ea3n ph\u1ea9m v\u00e1n d\u00e1n"},"content":{"rendered":"

B\u00f9i Ch\u00ed Ki\u00ean<\/em><\/strong><\/p>\n

T. t\u00e2m Th\u1ef1c nghi\u1ec7m & Chuy\u1ec3n giao k\u1ef9 thu\u1eadt CNR<\/em><\/p>\n

Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

V\u00e1n d\u00e1n (ply wood) l\u00e0 m\u1ed9t trong nh\u1eefng lo\u1ea1i v\u00e1n nh\u00e2n t\u1ea1o \u0111\u00e3 v\u00e0 \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ea5t r\u1ed9ng r\u00e3i tr\u00ean th\u1ebf gi\u1edbi. V\u00e1n d\u00e1n c\u00f3 c\u00e1c t\u00ednh ch\u1ea5t c\u01a1, l\u00fd v\u00e0 k\u00edch th\u01b0\u1edbc h\u01a1n h\u1eb3n g\u1ed7 t\u1ef1 nhi\u00ean s\u1ea3n su\u1ea5t ra n\u00f3. Tuy nhi\u00ean, v\u00e1n d\u00e1n th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t t\u1eeb c\u00e1c lo\u1ea1i g\u1ed7 ph\u00e1t tri\u1ec3n nhanh, c\u00f3 t\u00ednh c\u01a1 – l\u00fd th\u1ea5p nh\u01b0 tr\u00e1m, g\u1ea1o, sung, tr\u1ea9u, dung gi\u1ea5y, v\u1ea1ng… n\u00ean ch\u1ea5t l\u01b0\u1ee3ng v\u00e1n d\u00e1n ch\u01b0a cao, \u0111\u1eb7c bi\u1ec7t l\u00e0 ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t v\u00e1n.<\/p>\n

\u0110\u1ec3 kh\u1eafc ph\u1ee5c t\u1ed3n t\u1ea1i tr\u00ean \u0111\u1ed3ng th\u1eddi n\u00e2ng cao t\u00ednh th\u1ea9m m\u1ef9 c\u0169ng nh\u01b0 t\u0103ng gi\u00e1 tr\u1ecb s\u1eed d\u1ee5ng c\u1ee7a v\u00e1n d\u00e1n, ng\u01b0\u1eddi ta th\u01b0\u1eddng d\u00e1n, ph\u1ee7 l\u00ean b\u1ec1 m\u1eb7t v\u00e1n d\u00e1n c\u00e1c v\u1eadt li\u1ec7u nh\u01b0 m\u00e0ng keo, v\u00e1n l\u1ea1ng, t\u1ea5m trang s\u1ee9c nhi\u1ec1u l\u1edbp (Formica)… C\u00e1c h\u00ecnh th\u1ee9c c\u00f4ng ngh\u1ec7 d\u00e1n ph\u1ee7 n\u00e0y \u1edf Vi\u1ec7t Nam\u0111\u00e3 v\u00e0 \u0111ang \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng, nh\u01b0ng ch\u1ea5t l\u01b0\u1ee3ng ch\u01b0a cao v\u00e0 ch\u01b0a x\u00e2y d\u1ef1ng \u0111\u01b0\u1ee3c c\u00e1c th\u00f4ng s\u1ed1 v\u00e0 quy tr\u00ecnh c\u1ee5 th\u1ec3.<\/p>\n

Nh\u1eb1m g\u00f3p ph\u1ea7n v\u00e0o vi\u1ec7c x\u00e2y d\u1ef1ng quy tr\u00ecnh s\u1ea3n xu\u1ea5t h\u1ee3p l\u00fd \u0111\u1ec3 t\u1ea1o ra s\u1ea3n ph\u1ea9m c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng cao, ch\u00fang t\u00f4i th\u1ef1c hi\u1ec7n \u0111\u1ec1 t\u00e0i: ” Nghi\u00ean c\u1ee9u c\u00f4ng ngh\u1ec7 \u00e9p Formica l\u00ean m\u1ed9t m\u1eb7t s\u1ea3n ph\u1ea9m v\u00e1n d\u00e1n”.<\/p>\n

I. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/p>\n

\u0110\u1ec1 t\u00e0i th\u1ef1c hi\u1ec7n theo ph\u01b0\u01a1ng ph\u00e1p th\u1ef1c nghi\u1ec7m d\u1ef1a tr\u00ean c\u00e1c y\u1ebfu t\u1ed1 c\u1ed1 \u0111\u1ecbnh v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 c\u1ea7n x\u00e1c \u0111\u1ecbnh.<\/p>\n

1. C\u00e1c y\u1ebfu t\u1ed1 c\u1ed1 \u0111\u1ecbnh<\/strong><\/p>\n

– V\u00e1n m\u1ecfng: G\u1ed7 dung gi\u1ea5y<\/p>\n

– T\u1ea5m trang s\u1ee9c: Formica<\/p>\n

– Ch\u1ea5t k\u1ebft d\u00ednh: Keo synteko 1352<\/p>\n

– Ph\u01b0\u01a1ng ph\u00e1p \u00e9p: Kh\u00f4 – nhi\u1ec7t<\/p>\n

– S\u1ea3n ph\u1ea9m d\u00f9ng \u0111\u1ec3 s\u1ea3n xu\u1ea5t \u0111\u1ed3 m\u1ed9c th\u00f4ng d\u1ee5ng.<\/p>\n

2. C\u00e1c y\u1ebfu t\u1ed1 c\u1ea7n x\u00e1c \u0111\u1ecbnh<\/strong><\/p>\n

– Chi\u1ec1u d\u00e0y t\u1ea5m v\u00e1n m\u1ecfng t\u1ed1i \u01b0u d\u00f9ng \u0111\u1ec3 d\u00e1n b\u1ecdc m\u1eb7t sau c\u1ee7a s\u1ea3n ph\u1ea9m.<\/p>\n

– Th\u00f4ng s\u1ed1 ch\u1ebf \u0111\u1ed9 \u00e9p formica l\u00ean m\u1ed9t m\u1eb7t s\u1ea3n ph\u1ea9m v\u00e1n d\u00e1n (T, P, t).<\/p>\n

II. N\u1ed9i dung v\u00e0 k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u<\/p>\n

1. M\u1ed9t s\u1ed1 th\u00f4ng s\u1ed1 ch\u1ee7 y\u1ebfu c\u1ee7a nguy\u00ean li\u1ec7u<\/strong><\/p>\n

Nghi\u00ean c\u1ee9u n\u00e0y ch\u1ec9 x\u00e1c \u0111\u1ecbnh m\u1ed9t s\u1ed1 th\u00f4ng s\u1ed1 ch\u1ee7 y\u1ebfu c\u1ee7a nguy\u00ean li\u1ec7u li\u00ean quan t\u1edbi c\u00f4ng ngh\u1ec7 \u00e9p formica l\u00ean s\u1ea3n ph\u1ea9m v\u00e1n d\u00e1n.<\/p>\n

* Nguy\u00ean li\u1ec7u v\u00e1n m\u1ecfng:<\/em><\/strong><\/p>\n

– Lo\u1ea1i g\u1ed7: Dung gi\u1ea5y<\/p>\n

– \u0110\u1ed9 \u1ea9m: 8 – 12 %<\/p>\n

– C\u00e1c c\u1ea5p chi\u1ec1u d\u00e0y (Si): 1.5; 1.7; 2.0 mm<\/p>\n

– Sai s\u1ed1 chi\u1ec1u d\u00e0y: \u00b1 0.05 mm<\/p>\n

– T\u1ea7n s\u1ed1 v\u1ebft n\u1ee9t: <5 v\u1ebft\/cm<\/p>\n

– Chi\u1ec1u s\u00e2u v\u1ebft n\u1ee9t: <80 %<\/p>\n

* Nguy\u00ean li\u1ec7u v\u00e1n n\u1ec1n:<\/em><\/strong><\/p>\n

– Lo\u1ea1i g\u1ed7: Dung gi\u1ea5y<\/p>\n

– V\u00e1n d\u00e1n 3 l\u1edbp, chi\u1ec1u d\u00e0y 4 mm<\/p>\n

– Kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch: 0.58 g\/cm3<\/sup><\/p>\n

– Sai s\u1ed1 chi\u1ec1u d\u00e0y: \u00b10.1 mm<\/p>\n

*T\u1ea5m trang s\u1ee9c Formica:<\/em><\/strong><\/p>\n

– Chi\u1ec1u d\u00e0y: 0.58 mm<\/p>\n

– Kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch: 1.45 g\/cm3<\/sup><\/p>\n

– \u0110\u1ed9 nh\u1eb5n b\u1ec1 m\u1eb7t: \u00d112<\/p>\n

– \u00e1p su\u1ea5t \u00e9p cho ph\u00e9p: 25 – 30 Mpa<\/p>\n

– Nhi\u1ec7t \u0111\u1ed9 cho ph\u00e9p: 200 – 300 0<\/sup>C<\/p>\n

* Ch\u1ea5t k\u1ebft d\u00ednh:<\/em><\/strong><\/p>\n

– Keo synteko 1352<\/p>\n

– \u0110\u1ed9 nh\u1edbt (30 0<\/sup>C) 2500 \u00b1500 cps<\/p>\n

– Th\u1eddi gian s\u1ed1ng c\u00f4ng ngh\u1ec7: 2.5 gi\u1edd<\/p>\n

– H\u00e0m l\u01b0\u1ee3ng kh\u00f4: 67 %<\/p>\n

– \u0110\u1ed9 PH: 6.5<\/p>\n

– Ch\u1ea5t \u0111\u00f3ng r\u1eafn synteko 2741<\/p>\n

– L\u01b0\u1ee3ng keo tr\u00e1ng: 150 g\/m2<\/sup><\/p>\n

2. C\u01a1 s\u1edf l\u1ef1a ch\u1ecdn c\u00e1c th\u00f4ng s\u1ed1 ch\u1ebf \u0111\u1ed9 \u00e9p<\/strong><\/p>\n

* \u00e1p su\u1ea5t d\u00e1n \u00e9p:<\/em><\/strong><\/p>\n

\u00e1p su\u1ea5t d\u00e1n \u00e9p t\u1ea1o ra s\u1ef1 ti\u1ebfp x\u00fac c\u1ea7n thi\u1ebft cho c\u00e1c b\u1ec1 m\u1eb7t v\u1eadt d\u00e1n v\u00e0 \u1ed5n \u0111\u1ecbnh s\u1ea3n ph\u1ea9m. \u00e1psu\u1ea5t d\u00e1n \u00e9p ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o th\u00f4ng s\u1ed1 c\u00f4ng ngh\u1ec7, c\u00f3 th\u1ec3 bi\u1ec3u di\u1ec5n theo c\u00f4ng th\u1ee9c sau:<\/p>\n

P = f(lo\u1ea1i g\u1ed7, b\u1ec1 m\u1eb7t v\u1eadt d\u00e1n, k\u1ebft c\u1ea5u s\u1ea3n ph\u1ea9m, chi\u1ec1u d\u00e0y s\u1ea3n ph\u1ea9m, \u0111\u1ed9 \u1ea9m v\u1eadt d\u00e1n, nhi\u1ec7t \u0111\u1ed9 \u00e9p…).<\/p>\n

C\u0103n c\u1ee9 v\u00e0o c\u00e1c y\u1ebfu t\u1ed1 kh\u1ed1ng ch\u1ebf, th\u00f4ng s\u1ed1 nguy\u00ean li\u1ec7u v\u00e0 s\u1ea3n ph\u1ea9m \u0111\u1ec3 ch\u1ecdn \u00e1p su\u1ea5t \u00e9p (bi\u1ec3u 1).<\/p>\n

* Nhi\u1ec7t \u0111\u1ed9 d\u00e1n \u00e9p: <\/em><\/strong>V\u1edbi ph\u01b0\u01a1ng ph\u00e1p \u00e9p kh\u00f4 – nhi\u1ec7t v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 c\u1ed1 \u0111\u1ecbnh \u0111\u00e3 tr\u00ecnh b\u00e0y.<\/p>\n

C\u0103n c\u1ee9 v\u00e0o lo\u1ea1i keo v\u00e0 c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a keo; lo\u1ea1i g\u1ed7, \u0111\u1ed9 \u1ea9m; s\u1ed1 l\u1edbp v\u00e0 chi\u1ec1u d\u00e0y s\u1ea3n ph\u1ea9m nhi\u1ec7t \u0111\u1ed9 \u00e9p \u0111\u01b0\u1ee3c ch\u1ecdn l\u00e0 115 0<\/sup>C.<\/p>\n

* Th\u1eddi gian \u00e9p:<\/em><\/strong><\/p>\n

Th\u1eddi gian \u00e9p ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o th\u00f4ng s\u1ed1 c\u00f4ng ngh\u1ec7, c\u00f3 th\u1ec3 bi\u1ec3u di\u1ec5n theo c\u00f4ng th\u1ee9c sau:<\/p>\n

t= f(lo\u1ea1i g\u1ed7, chi\u1ec1u d\u00e0y v\u00e1n m\u1ecfng, k\u1ebft c\u1ea5u s\u1ea3n ph\u1ea9m, \u0111\u1ed9 \u1ea9m v\u1eadt d\u00e1n, lo\u1ea1i keo, nhi\u1ec7t \u0111\u1ed9 \u00e9p …)<\/p>\n

Theo c\u00f4ng th\u1ee9c th\u1ef1c nghi\u1ec7m c\u1ee7a Kulikob:<\/p>\n

t= A1<\/sub> + A2<\/sub>\u00e5(Si – 8) + A3<\/sub>\u00e5(Si – 9)2<\/sup><\/p>\n

Trong \u0111\u00f3: A1<\/sub>,A2,<\/sub>A3<\/sub> l\u00e0 c\u00e1c h\u1ec7 s\u1ed1 th\u1ef1c nghi\u1ec7m,<\/p>\n

\u00e5Si l\u00e0 t\u1ed5ng chi\u1ec1u d\u00e0y c\u00e1c l\u1edbp v\u00e1n m\u1ecfng trong s\u1ea3n ph\u1ea9m (mm).<\/p>\n

Th\u1eddi gian \u00e9p \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh trong bi\u1ec3u 1.<\/p>\n

Bi\u1ec3u 1. Ch\u1ebf \u0111\u1ed9 \u00e9p v\u00e1n<\/em><\/strong><\/p>\n\n\n\n\n\n\n\n\n\n
Lo\u1ea1i v\u00e1n<\/td>\nV\u00e1n 1<\/td>\nV\u00e1n 2<\/td>\nV\u00e1n 3<\/td>\nV\u00e1n 4<\/td>\nV\u00e1n 5<\/td>\n<\/tr>\n
Ch\u1ebf \u0111\u1ed9 \u00e9p<\/td>\n<\/tr>\n
T 0<\/sup>C<\/td>\n115<\/td>\n115<\/td>\n115<\/td>\n115<\/td>\n115<\/td>\n<\/tr>\n
P4<\/sub>, Kg\/cm2<\/sup><\/td>\n6.0<\/td>\n6.7<\/td>\n7.1<\/td>\n5.8<\/td>\n5.8<\/td>\n<\/tr>\n
P5<\/sub>, Kg\/cm2<\/sup><\/td>\n3.0<\/td>\n3.5<\/td>\n4.0<\/td>\n3.0<\/td>\n3.0<\/td>\n<\/tr>\n
t4, ph\u00fat<\/td>\n1.75<\/td>\n2.00<\/td>\n2.50<\/td>\n1.50<\/td>\n1.50<\/td>\n<\/tr>\n
t5, ph\u00fat<\/td>\n1.50<\/td>\n1.50<\/td>\n1.50<\/td>\n1.50<\/td>\n1.50<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

K\u1ebftc\u1ea5u v\u00e1n: Formica<\/strong><\/p>\n

V\u00e1n n\u1ec1n<\/p>\n

V\u00e1n 1,2,3 V\u00e1n m\u1ecfng V\u00e1n 5 V\u00e1n 4<\/p>\n

3. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u<\/strong><\/p>\n

* T\u1ef7 l\u1ec7 tr\u01b0\u01a1ng n\u1edf chi\u1ec1u d\u00e0y v\u00e1n:<\/em><\/strong><\/p>\n

– Ti\u00eau chu\u1ea9n ki\u1ec3m tra: GOCT 9620 – 72<\/p>\n

– K\u00edch th\u01b0\u1edbc m\u1eabu: 100 x 100 x S (mm)<\/p>\n

– C\u00f4ng th\u1ee9c t\u00ednh: Ds = ( S1<\/sub> – S0<\/sub> )\/S0<\/sub> x 100%<\/p>\n

Trong \u0111\u00f3: S1<\/sub> l\u00e0 chi\u1ec1u d\u00e0y c\u1ee7a v\u00e1n sau 2 gi\u1edd ng\u00e2m n\u01b0\u1edbc (mm)<\/p>\n

S2<\/sub> l\u00e0 chi\u1ec1u d\u00e0y c\u1ee7a v\u00e1n tr\u01b0\u1edbc khi ng\u00e2m (mm)<\/p>\n

K\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c x\u1eed l\u00fd theo th\u1ed1ng k\u00ea to\u00e1n h\u1ecdc, ghi \u1edf bi\u1ec3u 2.<\/p>\n

Bi\u1ec3u 2. T\u1ef7 l\u1ec7 tr\u01b0\u01a1ng n\u1edf chi\u1ec1u d\u00e0y v\u00e1n,%<\/em><\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Lo\u1ea1i v\u00e1n<\/td>\nV\u00e1n n\u1ec1n<\/td>\nV\u00e1n 1<\/td>\nV\u00e1n 2<\/td>\nV\u00e1n3<\/td>\nV\u00e1n4<\/td>\nV\u00e1n5<\/td>\n<\/tr>\n
\u0110T m\u1eabu<\/td>\n<\/tr>\n
x<\/td>\n4.15<\/td>\n1.707<\/td>\n1.46<\/td>\n1.31<\/td>\n0.78<\/td>\n3.06<\/td>\n<\/tr>\n
sx<\/td>\n0.61<\/td>\n0.095<\/td>\n0.009<\/td>\n0.05<\/td>\n0.06<\/td>\n1.04<\/td>\n<\/tr>\n
Trung v\u1ecb m\u1eabu<\/td>\n3.94<\/td>\n1.55<\/td>\n1.45<\/td>\n1.29<\/td>\n0.74<\/td>\n3.55<\/td>\n<\/tr>\n
S<\/td>\n0.25<\/td>\n0.097<\/td>\n0.03<\/td>\n0.07<\/td>\n0.08<\/td>\n0.32<\/td>\n<\/tr>\n
S2<\/sup><\/td>\n0.78<\/td>\n0.31<\/td>\n0.09<\/td>\n0.23<\/td>\n0.25<\/td>\n1.02<\/td>\n<\/tr>\n
Sk<\/td>\n1.23<\/td>\n– 0.24<\/td>\n– 1.27<\/td>\n– 1.106<\/td>\n0.91<\/td>\n– 1.17<\/td>\n<\/tr>\n
ex<\/td>\n1.45<\/td>\n1.03<\/td>\n0.35<\/td>\n0.31<\/td>\n1.04<\/td>\n0.51<\/td>\n<\/tr>\n
Xmin<\/td>\n3.38<\/td>\n1.39<\/td>\n1.35<\/td>\n0.99<\/td>\n0.45<\/td>\n2.62<\/td>\n<\/tr>\n
Xmax<\/td>\n5.79<\/td>\n2.28<\/td>\n1.62<\/td>\n1.70<\/td>\n1.30<\/td>\n5.22<\/td>\n<\/tr>\n
D(95%)<\/td>\n0.48<\/td>\n0.19<\/td>\n0.06<\/td>\n0.14<\/td>\n0.15<\/td>\n0.63<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

T\u1eeb k\u1ebft qu\u1ea3 bi\u1ec3u 2, ch\u00fang t\u00f4i l\u1eadp \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng tr\u00ecnh t\u01b0\u01a1ng quan gi\u1eefa tr\u01b0\u01a1ng n\u1edf chi\u1ec1u d\u1ea7y s\u1ea3n ph\u1ea9m v\u1edbi chi\u1ec1u d\u1ea7y v\u00e1n m\u1ecfng (Si):<\/p>\n

Ds = 3.65 – 22.21s + 23.77s2<\/sup> – 6.625s3<\/sup> (1-1); H\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan: r = 0.95<\/p>\n

* \u0110\u1ed9 h\u00fat n\u01b0\u1edbc c\u1ee7a v\u00e1n:<\/em><\/strong><\/p>\n

– Ti\u00eau chu\u1ea9n ki\u1ec3m tra: GOCT 9620 – 72<\/p>\n

– K\u00edch th\u01b0\u1edbc m\u1eabu: 100 x 100 x S (mm)<\/p>\n

– C\u00f4ng th\u1ee9c t\u00ednh: Hn = (m1<\/sub> – m0<\/sub>)\/m0<\/sub> x 100,%<\/p>\n

Trong \u0111\u00f3: m1<\/sub> l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u00e1n sau 2 gi\u1edd ng\u00e2m n\u01b0\u1edbc (g)<\/p>\n

m0<\/sub> l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u00e1n tr\u01b0\u1edbc khi ng\u00e2m (g)<\/p>\n

K\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c x\u1eed l\u00fd theo th\u1ed1ng k\u00ea to\u00e1n h\u1ecdc. Ch\u00fang t\u00f4i l\u1eadp \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng tr\u00ecnh t\u01b0\u01a1ng quan gi\u1eefa \u0111\u1ed9 h\u00fat n\u01b0\u1edbc c\u1ee7a s\u1ea3n ph\u1ea9m v\u1edbi chi\u1ec1u d\u1ea7y v\u00e1n m\u1ecfng (Si):<\/p>\n

Hn = 14.78 – 129.03s + 146.37s2<\/sup> – 40.98s3<\/sup> (1-2); H\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan: r = 0.9<\/p>\n

* T\u1ef7 l\u1ec7 bi\u1ebfn d\u1ea1ng c\u1ee7a v\u00e1n:<\/em><\/strong><\/p>\n

– Ti\u00eau chu\u1ea9n ki\u1ec3m tra: GOCT 9620 – 72<\/p>\n

– K\u00edch th\u01b0\u1edbc m\u1eabu: 600 x 600 x S (mm)<\/p>\n

– C\u00f4ng th\u1ee9c t\u00ednh: Kbd = (f1<\/sub> – f0<\/sub>)\/f0<\/sub> x 100,%<\/p>\n

Trong \u0111\u00f3: f1<\/sub> l\u00e0 tr\u1ecb s\u1ed1 bi\u1ebfn d\u1ea1ng c\u1ee7a v\u00e1n s\u1ea3n ph\u1ea9m (v\u00e1n1,2,3,5) (mm)<\/p>\n

f0<\/sub> l\u00e0 tr\u1ecb s\u1ed1 bi\u1ebfn d\u1ea1ng c\u1ee7a v\u00e1n n\u1ec1n<\/p>\n

K\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c x\u1eed l\u00fd theo th\u1ed1ng k\u00ea to\u00e1n h\u1ecdc, ghi \u1edf bi\u1ec3u 3<\/p>\n

Bi\u1ec3u 3. T\u1ef7 l\u1ec7 bi\u1ebfn d\u1ea1ng c\u1ee7a v\u00e1n,%<\/em><\/strong><\/p>\n\n\n\n\n
Lo\u1ea1i v\u00e1n<\/td>\nV\u00e1n 1<\/td>\nV\u00e1n 2<\/td>\nV\u00e1n3<\/td>\nV\u00e1n 4<\/td>\nV\u00e1n5<\/td>\n<\/tr>\n
Kbd,%<\/td>\n43.30<\/td>\n32.27<\/td>\n18.83<\/td>\n0.00<\/td>\n70.93<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

T\u1eeb k\u1ebft qu\u1ea3 bi\u1ec3u 3, ch\u00fang t\u00f4i l\u1eadp \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng tr\u00ecnh t\u01b0\u01a1ng quan gi\u1eefa t\u1ef7 l\u1ec7 bi\u1ebfn d\u1ea1ng c\u1ee7a s\u1ea3n ph\u1ea9m v\u1edbi chi\u1ec1u d\u1ea7y v\u00e1n m\u1ecfng:<\/p>\n

Kbd = 78.13 – 28.38s + 3.49lg(s) (1-3); V\u1edbi r = 0.97<\/p>\n

* C\u01b0\u1eddng \u0111\u1ed9 u\u1ed1n t\u0129nh c\u1ee7a v\u00e1n:<\/em><\/strong><\/p>\n

– Ti\u00eau chu\u1ea9n ki\u1ec3m tra: GOCT 9625 – 72<\/p>\n

– K\u00edch th\u01b0\u1edbc m\u1eabu: 150 x 50 x S (mm)<\/p>\n

– C\u00f4ng th\u1ee9c t\u00ednh: su<\/sub>= 3Pl\/2bs2<\/sup> (Kg\/cm2<\/sup>)<\/p>\n

Trong \u0111\u00f3: P: l\u1ef1c ph\u00e1 hu\u1ef7 m\u1eabu – b: chi\u1ec1u r\u1ed9ng m\u1eabu (cm)<\/p>\n

l: chi\u1ec1u d\u00e0i g\u1ed1i – s: chi\u1ec1u d\u00e0y m\u1eabu (cm)<\/p>\n

K\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c x\u1eed l\u00fd theo th\u1ed1ng k\u00ea to\u00e1n h\u1ecdc. Ch\u00fang t\u00f4i l\u1eadp \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng tr\u00ecnh t\u01b0\u01a1ng quan gi\u1eefa c\u01b0\u1eddng \u0111\u1ed9 u\u1ed1n t\u0129nh v\u1edbi chi\u1ec1u d\u1ea7y v\u00e1n m\u1ecfng(Si):<\/p>\n

su <\/sub>=”1315.8″ – 485.34s + 68.42s2 <\/sup>(1-4); H\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r = 0.98<\/p>\n

* M\u00f4 \u0111un \u0111\u00e0n h\u1ed3i c\u1ee7a v\u00e1n:<\/em><\/strong><\/p>\n

– Ti\u00eau chu\u1ea9n ki\u1ec3m tra: GOCT 9625 – 72<\/p>\n

– K\u00edch th\u01b0\u1edbc m\u1eabu: 150 x 50 x S (mm)<\/p>\n

– C\u00f4ng th\u1ee9c t\u00ednh: Eu = P1<\/sub>l3<\/sup>\/4bs3<\/sup>f (Kg\/cm2<\/sup>)<\/p>\n

Trong \u0111\u00f3: P1<\/sub>: l\u1ef1c t\u00e1c d\u1ee5ng khi th\u1eed m\u00f4 \u0111un \u0111\u00e0n h\u1ed3i (kg); P1<\/sub> = 25%P<\/p>\n

l: chi\u1ec1u d\u00e0i g\u1ed1i,cm; b: chi\u1ec1u r\u1ed9ng m\u1eabu (cm)<\/p>\n

S: chi\u1ec1u d\u00e0y m\u1eabu,cm; f: \u0111\u1ed9 v\u00f5ng trung b\u00ecnh c\u1ee7a m\u1eabu (cm)<\/p>\n

K\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c x\u1eed l\u00fd theo th\u1ed1ng k\u00ea to\u00e1n h\u1ecdc. Ch\u00fang t\u00f4i l\u1eadp \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng tr\u00ecnh t\u01b0\u01a1ng quan gi\u1eefa m\u00f4 \u0111un \u0111\u00e0n h\u1ed3i v\u1edbi chi\u1ec1u d\u1ea7y v\u00e1n m\u1ecfng(Si):<\/p>\n

Eu=”62735.73″ – 17895s + 819.03s2 <\/sup>(1-5); H\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan r = 0.97<\/p>\n

* C\u01b0\u1eddng \u0111\u1ed9 k\u00e9o tr\u01b0\u1ee3t m\u00e0ng keo:<\/em><\/strong><\/p>\n

– Ti\u00eau chu\u1ea9n ki\u1ec3m tra: JAS<\/p>\n

– K\u00edch th\u01b0\u1edbc m\u1eabu: 50 x 50 x S (mm)<\/p>\n

N\u1ed9i dung c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p n\u00e0y theo quy tr\u00ecnh sau:<\/p>\n

– Ng\u00e2m m\u1eabu v\u00e0o n\u01b0\u1edbc l\u1ea1nh trong th\u1eddi gian 6 gi\u1edd<\/p>\n

– S\u1ea5y m\u1eabu \u1edf nhi\u1ec7t \u0111\u1ed9 400<\/sup>C trong th\u1eddi gian 18 gi\u1edd<\/p>\n

– X\u00e1c \u0111\u1ecbnh v\u1ebft n\u1ee9t (bong) c\u1ee7a m\u00e0ng keo; n\u1ebfu chi\u1ec1u d\u00e0i m\u00e0ng keo b\u1ecb ph\u00e1 hu\u1ef7 <70% t\u1ed5ng chi\u1ec1u d\u00e0i to\u00e0n b\u1ed9 m\u00e0ng keo th\u00ec m\u1ed1i d\u00e1n \u0111\u1ea1t y\u00eau c\u1ea7u v\u1ec1 c\u01b0\u1eddng \u0111\u1ed9 k\u00e9o tr\u01b0\u1ee3t.<\/p>\n

K\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m: T\u1ea5t c\u1ea3 c\u00e1c m\u1eabu \u0111\u1ec1u xu\u1ea5t hi\u1ec7n v\u1ebft n\u1ee9t m\u00e0ng keo, song t\u1ed5ng chi\u1ec1u d\u00e0i v\u1ebft n\u1ee9t \u0111\u1ec1u <20% t\u1ed5ng chi\u1ec1u d\u00e0i to\u00e0n b\u1ed9 m\u00e0ng keo, \u0111i\u1ec1u n\u00e0y ch\u1ee9ng t\u1ecf c\u01b0\u1eddng \u0111\u1ed9 k\u00e9o tr\u01b0\u1ee3t m\u00e0ng keo c\u1ee7a s\u1ea3n ph\u1ea9m ho\u00e0n to\u00e0n \u0111\u1ea1t y\u00eau c\u1ea7u.<\/p>\n

* X\u00e1c \u0111\u1ecbnh chi\u1ec1u d\u00e0y v\u00e1n m\u1ecfng (Si) t\u1ed1i \u01b0u:<\/em><\/strong><\/p>\n\n\n\n
Ds min; Hn<\/sub> min; Kbd<\/sub> min; su <\/sub>max; Eu<\/sub> max; DE min.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh chi\u1ec1u d\u00e0y v\u00e1n m\u1ecfng t\u1ed1i \u01b0u ch\u00fang t\u00f4i d\u1ef1a tr\u00ean \u0111i\u1ec1u ki\u1ec7n c\u1ee7a c\u00e1c h\u00e0m m\u1ee5c ti\u00eau nh\u01b0 sau:<\/p>\n

Gi\u1ea3i b\u00e0i to\u00e1n t\u1ed1i \u01b0u theo ph\u01b0\u01a1ng ph\u00e1p h\u00e0m tr\u1ecdng l\u01b0\u1ee3ng; t\u1eeb c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh (1-1), (1-2), (1-3), (1-4), (1-5), ch\u00fang ta \u0111\u01b0\u1ee3c: S = 1.62 mm. C\u0103n c\u1ee9 v\u00e0o th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a m\u00e1y b\u00f3c g\u1ed7, ch\u00fang t\u00f4i th\u1ea5y chi\u1ec1u d\u00e0y v\u00e1n m\u1ecfng t\u1ed1i \u01b0u l\u00e0 1.7 mm.<\/p>\n

C\u0103n c\u1ee9 v\u00e0o m\u1ee5c ti\u00eau s\u1eed d\u1ee5ng s\u1ea3n ph\u1ea9m, \u0111i\u1ec1u ki\u1ec7n thi\u1ebft b\u1ecb, k\u1ebft qu\u1ea3 th\u1ef1c nghi\u1ec7m, kh\u1ea3 n\u0103ng \u1ee9ng d\u1ee5ng v\u00e0o s\u1ea3n xu\u1ea5t, c\u00e1c ch\u1ec9 ti\u00eau ch\u1ea5t l\u01b0\u1ee3ng, v\u1edbi Si t\u1ed1i \u01b0u l\u00e0 1.7 mm, ch\u00fang t\u00f4i x\u00e2y d\u1ef1ng \u0111\u01b0\u1ee3c th\u00f4ng s\u1ed1 ch\u1ebf \u0111\u1ed9 \u00e9p Formica l\u00ean m\u1ed9t b\u1ec1 m\u1eb7t s\u1ea3n ph\u1ea9m v\u00e1n d\u00e1n nh\u01b0 sau:<\/p>\n

+ Nhi\u1ec7t \u0111\u1ed9 \u00e9p: 1150<\/sup>C<\/p>\n

+ \u00e1p xu\u1ea5t \u00e9p max: 6.7 Kg\/cm2<\/sup><\/p>\n

+ \u00e1p xu\u1ea5t \u1edf giai \u0111o\u1ea1n gi\u1ea3m \u00e1p:3.5 Kg\/cm2<\/sup><\/p>\n

+Th\u1eddi gian duy tr\u00ec \u00e1p xu\u1ea5t \u00e9p max: 2.0 ph\u00fat<\/p>\n

+ Th\u1eddi gian gi\u1ea3m \u00e1p: 1.5 ph\u00fat.<\/p>\n

III. K\u1ebft lu\u1eadn.<\/p>\n

Nghi\u00ean c\u1ee9u c\u00f4ng ngh\u1ec7 \u00e9p Formica l\u00ean m\u1ed9t m\u1eb7t s\u1ea3n ph\u1ea9m v\u00e1n d\u00e1n n\u00f3i ri\u00eang v\u00e0 v\u00e1n nh\u00e2n t\u1ea1o n\u00f3i chung, tr\u00ean c\u01a1 s\u1edf \u0111\u00f3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00e1c tr\u1ecb s\u1ed1 c\u00f4ng ngh\u1ec7 t\u1ed1i \u01b0u l\u00e0 m\u1ed9t trong nh\u1eefng v\u1ea5n \u0111\u1ec1 \u0111ang \u0111\u01b0\u1ee3c c\u00e1c chuy\u00ean gia v\u00e1n nh\u00e2n t\u1ea1o quan t\u00e2m. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u00e3 gi\u1ea3i quy\u1ebft m\u1ed9t v\u1ea5n \u0111\u1ec1 c\u00f4ng ngh\u1ec7 thu\u1ed9c l\u0129nh v\u1ef1c v\u00e1n nh\u00e2n t\u1ea1o n\u00f3i chung. G\u1ed7 l\u00e0 v\u1eadt li\u1ec7u d\u1ecb h\u01b0\u1edbng, v\u00ec v\u1eady x\u00e1c \u0111\u1ecbnh c\u00e1c c\u00e1c th\u00f4ng s\u1ed1 c\u00f4ng ngh\u1ec7 t\u1ed1i \u01b0u cho m\u1ed9t s\u1ea3n ph\u1ea9m d\u1ecb h\u01b0\u1edbng l\u00e0 v\u1ea5n \u0111\u1ec1 r\u1ea5t ph\u1ee9c t\u1ea1p. Ch\u00fang t\u00f4i hy v\u1ecdng r\u1eb1ng k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u tr\u00ean c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng trong qu\u00e1 tr\u00ecnh nghi\u00ean c\u1ee9u v\u00e0 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u00e0o th\u1ef1c t\u1ebf s\u1ea3n xu\u1ea5t \u1edf n\u01b0\u1edbc ta hi\u1ec7n nay.<\/p>\n

T\u00e0i li\u1ec7u tham kh\u1ea3o<\/strong><\/p>\n

1. B\u00f9i Minh Tr\u00ed, B\u00f9i Th\u1ebf T\u00e2m. Gi\u00e1o tr\u00ecnh t\u1ed1i \u01b0u ho\u00e1 – NXB Giao th\u00f4ng v\u1eadn t\u1ea3i 1995.<\/p>\n

2. Nguy\u1ec5n H\u1ea3i Tu\u1ea5t, Ng\u00f4 Kim Kh\u00f4i. X\u1eed l\u00fd th\u1ed1ng k\u00ea k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u th\u1ef1c nghi\u1ec7m trong N\u00f4ng L\u00e2m nghi\u1ec7p tr\u00ean m\u00e1y vi t\u00ednh – NXB N\u00f4ng nghi\u1ec7p 1996.<\/p>\n

3. Kulikob. C\u00f4ng ngh\u1ec7 s\u1ea3n xu\u1ea5t v\u00e1n d\u00e1n – NXB C\u00f4ng nghi\u1ec7p r\u1eebng Moxkva 1976.<\/p>\n

4. Kirilob, Kraceb. C\u00f4ng ngh\u1ec7 s\u1ea3n xu\u1ea5t v\u00e1n d\u00e1n – NXB C\u00f4ng nghi\u1ec7p r\u1eebng Moxkva 1974.<\/p>\n

Research on the technology for pressing formica sheet on the surface of plywood<\/strong><\/p>\n

Summary: <\/em><\/strong>Plywood has its mechanical and physical properties and size far better than those of natural wood from which it is made. However as regards quality there are some remaining problems with plywood especially the quality of its surface. This paper deals with the technology of pressing Formica sheet on the surface of the product to overcome the above mentioned problems. Based on the aim in the use of the plywood product, equipment available results from experiments and their potential application in production with optional thickness of the veneer of 1.7mm, parameters are found out by the author for pressing Formica sheet on the surface of plywood product as follows:<\/p>\n

– Pressing temperature: 1150<\/sup>C<\/p>\n

– Pressing pressure, max 6.7 kg\/ cm2<\/sup><\/p>\n

– Pressure in the period of decreasing pressure: 3.5 kg\/ cm2<\/sup><\/p>\n

– Duration of max pressing presure: 2 minutes<\/p>\n

– Duration of decreasing presure: 15 minutes************************************<\/p>\n","protected":false},"excerpt":{"rendered":"

Ván dán (ply wood) là m\u1ed9t trong nh\u1eefng lo\u1ea1i ván nhân t\u1ea1o \u0111ã và \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ea5t r\u1ed9ng rãi trên th\u1ebf gi\u1edbi. Ván dán có các tính ch\u1ea5t c\u01a1, lý và kích th\u01b0\u1edbc h\u01a1n h\u1eb3n g\u1ed7 t\u1ef1 nhiên s\u1ea3n su\u1ea5t ra nó. Tuy nhiên, ván dán th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t t\u1eeb các lo\u1ea1i g\u1ed7 phát tri\u1ec3n nhanh, có tính c\u01a1 – lý th\u1ea5p nh\u01b0 trám, g\u1ea1o, sung, tr\u1ea9u, dung gi\u1ea5y, v\u1ea1ng… nên ch\u1ea5t l\u01b0\u1ee3ng ván dán ch\u01b0a cao, \u0111\u1eb7c bi\u1ec7t là ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t ván. <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8581"}],"collection":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/comments?post=8581"}],"version-history":[{"count":2,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8581\/revisions"}],"predecessor-version":[{"id":19320,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8581\/revisions\/19320"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=8581"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=8581"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=8581"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}