chetaokhuoninpolymer my linh

B CNG THNG TRNG I HC CNG NGHIP TP.H CH MINH KHOA CNG NGH HA HC

TIU LUN MN GIA CNG POLYMER

TN TI

CH TO BN IN POLYMER BNG PHNG PHP QUANG HA

Ging vin hng dn Sinh vin thc hin MSSV Lp

: HUNH TH VIT H : NGUYN TH M LINH : 09251661 : DHHO5LT

Tp. H Ch Minh, thng 04 nm 2011

B CNG THNG TRNG I HC CNG NGHIP TP.H CH MINH KHOA CNG NGH HA HC

TIU LUN MN GIA CNG POLYMER

TN TI

CH TO BN IN POLYMER BNG PHNG PHP QUANG HA

Ging vin hng dn Sinh vin thc hin MSSV Lp

: HUNH TH VIT H : NGUYN TH M LINH : 09251661 : DHHO5LT

Tp. H Ch Minh, thng 04 nm 2011

MC LCTp. H Ch Minh, thng 04 nm 2011.........................................................................1 GII THIU TI...................................................................................................1 CHNG 1: GII THIU CHUNG.............................................................................2 1.1. i nt v vt liu polymer..................................................................................2 1.2. Polymer cm quang.............................................................................................3 1.3. ng dng.............................................................................................................4 1.3.1. Cc loi mng cm quang .............................................................................4 1.3.2. Yu cu chung i vi mng cm quang:......................................................4 1.3.2.1. Kh nng to mng mng, nhy sng trn lp kim loi lm bn (hoc lp trung gian).................................................................................................4 1.3.2.2. C bm dnh tt vi lp .................................................................5 1.3.2.3. C phn gii cao.................................................................................5 1.3.2.4. To ranh gii phn bit r nt trong qu trnh hin copy........................5 CHNG 2: C IM CA CC LOI KHUN IN............................................6 2.1. c im chung..................................................................................................6 2.2. Phn loi bn in flexo..........................................................................................6 2.2.1. Bn cao su th cng.......................................................................................7 2.2.1.1. u im..................................................................................................7 2.2.1.2. Nhc im.............................................................................................7 2.2.2. Bn cao su c..............................................................................................7 2.2.3. Bn Photpolymer...........................................................................................8 2.3. So Snh 2 loi bn photopolymer dng lng v dng rn....................................9 CHNG 3: CNG NGH CH TO KHUN IN FLEXO DNG BN CAO SU .....................................................................................................................................12 3.1. c im ca bn cao su....................................................................................12 3.2. Mng nhy sng trong ch to khun in............................................................12 3.2.1. Mng nhy sng trn c s mui crm........................................................12 3.2.2. Mng nhy sng trn c s hp cht Diazo..............................................14 3.2.2.1. Hp cht Diazo.....................................................................................14 3.2.2.2. c im ca mng Diazo....................................................................15 i

3.3. Cng ngh ch to khun in flexo bng phng php p ra nhit.....................17 3.3.1. Ch to khun p.........................................................................................17 3.3.2. Ch to khun in Flexo...............................................................................18 3.3.3. Trnh t lm bn in flexo.............................................................................18 3.3.4. Cng ngh tm tt khi ch to khun in cao su...........................................21 3.4. Cng ngh ch to khun in flexo bng tm photpolyme..................................21 3.4.1. Mng nhy sng trn c s hp cht photopolyme......................................21 3.4.2. c im ca bn photopolyme..................................................................23 3.5. Cu to bn photopolyme.................................................................................24 3.5.1. Cng ngh ch to khun in dng photopolyme lng..................................24 3.5.2. Cng ngh ch to khun in dng tm photopolyme...................................26 3.5.2.1. Chun b: (preparation).........................................................................26 3.5.2.2. Phi pha sau (Back Exposure).............................................................26 3.5.2.3. Phi pha trc (Face Exposure)...........................................................27 3.5.2.4. Hin hnh (Wash out)............................................................................27 3.5.2.5. Sy kh (drying)....................................................................................27 3.5.2.6. Hon thin bn (Post Exposure)............................................................28 3.5.2.7. Tiu chun k thut ca bn in Flexo....................................................28 3.5.2.8. Bo qun bn in....................................................................................28 KT LUN................................................................................................................29

ii

DANH MC HNH

Hnh 2-1: Cu to bng photopolymer...........................................................................8 Hnh 2-2: Bn photopolymer ghi bng laser................................................................11 Hnh 3-3: S qu trnh p to khun p (Matrix)....................................................18 Hnh 3-4: Trnh t lm bn in flexo.............................................................................20 Hnh 3-5: Cng ngh tm tt khi ch to khun in cao su............................................21 Hnh 3-6: Bn photopolyme.........................................................................................24 Hnh 3-7: Gn m bn..................................................................................................25 Hnh 3-8: To lp photopolyme...................................................................................25 Hnh 3-9: Qu trnh phi pha trc to phn t in......................................................26

iii

ti: Cng ngh ch to bn in polymer bng phng php quang ha

GII THIU TINgy nay, cng ngh vt liu c nhng bc pht trin cao.Trong , hp cht polymer ngy cng c s dng rng ri trong cng nghip v i sng. Nh nhng u im ca mnh m polymer thay th rt nhiu vt dng trong cuc sng cng nh p ng c yu cu k thut trong cng nghip.V bn cnh vic la chn bn in c nh hng trc tip v c vai tr ht sc quan trng trong bt k mt h thng my in no. Hu ht tt c cc cng ty c trang b h thng in, d l ghi nhit, violet hay nh sng kh kin u cho bit l cht lng in c tng ln v hiu qu t c thy r. Song ngy nay, s khc bit quan trng gia h thng in chnh l loi bn in c s dng v cc yu cu cho qu trnh x l bn. c th hiu r hn v thnh phn ha hc v phng php gia cng, trong bi tiu lun nay s thy r hn v: ch to bn in polyme bng phng php quang ha

GVHD: Hunh Th Vit H

1


CHNG 1: GII THIU CHUNG

1.1. i nt v vt liu polymerPolyme l cc hp cht c khi lng phn t ln v trong cu trc ca chng c s lp i lp li nhiu ln nhng n v monome (cn gi l cc mt xch). Cc phn t tng t nhng c khi lng thp hn c gi l cc oligome. c hnh thnh trong t nhin ngay t nhng ngy u hnh thnh tri t. Chng hn nh Xenluloz-thnh phn ch yu ca t bo thc vt v protit-thnh phn ch yu ca t bo sng u l nhng hp cht quan trng trong i sng hng ngy. T thi xa ngi ta bit s dng cc vt liu polyme t nhin nh bng, si gai, t tm, len lm qun o, da ng vt lm giy, o qunNgi Ai cp cn bit dng da lm giy vit th bo cho ti khi h tm ra phng php iu ch hp cht cao phn t mi l giy. Cng trnh ny m u cho cc qu trnh gia cng, ch to cc hp cht polyme thin nhin v i vo nghin cu cc polyme nhn to. n nm 1933, Gay Lussac tng hp c polyeste va polylactic khi un nng vi axit lactic, Braconnot iu ch c trinitroxenluloz bng phng php chuyn ha ng dng v J.Berzilius l ngi a ra khi nim v polyme. T polyme chuyn sang thi k tng hp bng phng php ha hc thun ty, i su vo nghin cu nhng tnh cht ca polyme nht l nhng polyme t nhin. Nh p dng cc phng php vt l hin i xc nh cu trc ca polymer, ngi ta c th rt ra kt lun chung v cu trc ca cc hp cht cao phn t nh sau: Hp cht cao phn t l t hp ca cc phn t c ln khc nhau v cu trc phn t v thnh phn n v cu trc monome trong mch phn t Cc nguyn t hnh thnh mch chnh ca phn t tn ti dng si v c th thc hin c s chuyn ng dao ng xung quanh lin kt ha tr, lm thay i cu trc ca i phn t. Tnh cht ca polymer ph thuc vo khi lng phn t, cu trc phn t, un do, thnh phn ha hc cng nh l bn cht tng tc gia cc phn t. Dung dch polymer l mt h bn nhit ng hc va cng khng khc vi dung dch tht ca cc cht thp phn t,nhng lc tng hp v solvat ha rt ln ngay c trong dung dch long 9 (thc t c rt t dung dich polymer tn ti dng keo)

GVHD: Hunh Th Vit H

2


Sau khi thit lp c cc nguyn tc hnh thnh polymer, ha hc polymer pht trin rt nhanh, chuyn t bin tnh polymer sang tng hp polymer t nhng sn phm ch bin du m than v kh thin nhin ng thi vi s tm ra nhng polyme mi, cc phng php tng hp mi cng c ci tin rt nhiu nh phng php ngng t cn bng, cao su lu ha, trng hp quang ha, trng hp gc, trung hp anion, trng hp ghp, trng ngng gia cc pha, ng trng hp kp Thnh cng ca polyme l trng hp polyme trng thi rn c tnh bn nhit cao,c tnh dn in, l c s hnh thnh nn cng nghip sn xut polyme bn nhit cao. Bn cnh vic tng hp cc polyme c hot tnh sinh hc c tc dng gii thch cc qu trnh sng, qu trnh nn men, qu trnh trao di cht trong t bo c th sng m ngi ta goi n l polyme sinh hc (biopolymer) Trong cng nghip sn xut vt liu polyme cng c nhng bc tin ln trong vic ci tin cc phng php gia cng nh phng php tng hp (compounding, blending), c (casting), gia cng c hc (rolling, laminating), trng-ph (coating) lm cho thi gian a vo sn xut nhng cng trnh nghin cu ngy mt nhanh hn. Vi kh nng ng dng trong hu ht cc ngnh ph v di sng nh: cng ngh cao su, cht do, t si, thc phm, xy dng, c kh, in-in t, hnh khng, dc liu, mu sc v lnh vc quc phng nh: tn la, tu du hnh v tru, my bay siu m

1.2. Polymer cm quangPolymer cm quang l nhng loi polymer nhy cm vi cc ngun nh sng. Ngun quang hc ng rn bc x c th l tia cc tm (UV), nh sng, laser c quan tm nghin cu trong nhng nm 1990. Nhng k thut ny da trn nhng phn ng ha hc i hi s kch hot ca cc vng nh sng UV, kh kin, IR, hay proton. Qu trnh ng rn cng xy ra bng cc chui ht electron, tia X, tia , plasma, sng siu m. Photoresist L mt dng c bit ca polymer cm quang, chng c ngdng rng ri trong lnh vc quang khc, c kh nng to hnh nh ni (relief) trn sn phm v gip chng li qu trnh khc n mn trn b mt sn phm. Polymer cm quang ni chung v photoresist ni ring gm c 2 loi: loi to nh DNG v loi to nh M.

GVHD: Hunh Th Vit H

3


Loi to nh DNG l h gm cc polymer c trng lng phn t ln, di tc dng ca cc bc x s chuyn sang cc polymer hoc cc monomer c trng lng phn t thp hn, c kh nng ho tan tt hn trong dung mi thch hp. Hay polymer ban u (c cha cc nhm chc nhy quang) l loi kh ho tan, di tc dng ca bc x s hiu chnh nhm chc tan d hn. Loi to nh M l cc h m ban u gm l h d ho tan, sau chuyn sang dng kh ho tan do thc hin cc phn ng quang polyme ho to mng ngang hay c hiu chnh nhm chc.

1.3. ng dngPolymer cm quang c s dng ch yu trong lnh vc sn, mng ph, vecni trn cc nn g, kim loi, nha,.. Ngoi ra cn c s dng rt nhiu trong ngnh cng nghip hnh nh, cng ngh in n, in t. Mng cm quang (mng bt hnh): l lp mng polymer c ha tan tng hoc gim sau khi b nh sng tc dng. 1.3.1. Cc loi mng cm quang ha tan tng -> MCQ c tnh cht Dng bn. Ngha l: + Ch b chiu sng s b ra tri khi hin bn. + Ch khng b chiu sng khng b ra tri khi hin bn (y l tnh cht vn c ca MCQ c tnh cht Dng bn). ha tan gim -> MCQ c tnh cht m bn. Ngha l: + Ch b chiu sng s b c cng v khng b ra tri khi hin bn. + Ch khng b chiu sng b ra tri khi hin bn (y l tnh cht vn c ca MCQ c tnh cht m bn). 1.3.2. Yu cu chung i vi mng cm quang: 1.3.2.1. Kh nng to mng mng, nhy sng trn lp kim loi lm bn (hoc lp trung gian) To mng mng (thng khong 1 n 2 micromet) cho thi gian phi ngn. iu ny ng cho hu ht cng ngh ch to khun in, tr khun in Flexo (tham kho thm trong phn ch to khun in Flexo). Phi nhy sng v y l c tnh tin quyt ca MCQ.

GVHD: Hunh Th Vit H

4


1.3.2.2. C bm dnh tt vi lp Nu khng bm dnh tt, MCQ c th b bong trc dn n mt kh nng sao chp. i vi bn in Offset mt lp, sau khi hin bn, MCQ s c gi li lm phn t in v tham gia trc tip vo qu trnh in nn bm dnh ca MCQ trn bn s quyt nh bn ca bn. i vi bn in Flexo, th MCQ ng vai tr va l phn t in va l phn t khng in. i vi bn in Typ, ng ng, MCQ ch gi vai tr trung gian nhng vn cn phi bm dnh tt trong qu trnh n mn kim loi, di tc ng ca axt. 1.3.2.3. C phn gii cao MCQ c phn gii cao gip cho bn in c kh nng ti to y cc chi tit nh nht c th c trn phim. phn gii ca MCQ ph thuc vo bn thn tnh cht ca MCQ, tnh cht bm dnh ca MCQ trn (nu c), dy v s tip xc ng u ca MCQ. 1.3.2.4. To ranh gii phn bit r nt trong qu trnh hin copy MCQ phi c kh nng phn bit r u l phn t in, u l phn t khng in khi phi trn bn in. Ngoi 5 yu cu chnh k trn cn c cc yu cu ph khc: trong sut, khng c hi, khng mi, d iu ch... D l mng cm quang m hay dng th cu to mng cm quang phi c 2 thnh phn chnh: Cht cm quang: l cht nhy sng, n s thay i tnh cht khi c chiu sng thch hp. Cht cm quang m bn: nha diazo, mui bicromat; cht cm quang dng bn: ortho naphto quinon diazid (ONQD), .... Cht to mng: l cht gp phn vo phn ng quang ho khi MCQ c chiu sng. i vi MCQ trn c s mui bicromat (m bn) ca km offset 1 lp, ngi ta dng cht cm quang l mui bicromat kt hp vi cht to mng l polymer gc nc (nh adao (da tru), gelatine, hoc keo PVA 205 / PVA 215, ...). V l MCQ m bn nn tnh cht c hu ca MCQ trn c s mui bicromat l d b ra tri, ch ch no b chiu sng th khi polymer gc nc s ng vai tr cht kh trong phn ng quang ho gip lm c cng MCQ.

GVHD: Hunh Th Vit H

5


CHNG 2: C IM CA CC LOI KHUN IN

2.1. c im chungTrong bt c mt phng php in no, khun in l yu t trung tm, n quyt nh ti dng my in, qu trnh in v cht lng sn phm in. Khun in l yu t quan trng phn bit cc phng php in, do ngi ta thng phn loi cc phng php in theo c im ca loi khun in. Cc phng php in pht trin thay th ln nhau nhng v nguyn l in th gn nh khng thay i nhiu, m ch thay i nguyn l ch to khun in, khun in l yu t thay i nhiu nht. Khun in hay cn gi l bn in (printing plate) l mt bn mang cc hnh nh, ch cn in khi lp ln my in, s in ra c cc t in ging nhau. Nh vy mt khun in ra cc t in c cc hnh nh, th khun in phi c hai phn ring bit l phn t nhn mc cn gi l phn t in (printing area) v phn t khng nhn mc (nonprinting area). Hai phn t trn khun in phi khc nhau khi truyn mc ln khun in, phn t in bt mc cn phn t khng in th khng bt mc. Chnh s khc nhau gia 2 phn t ny s quyt nh cc loi khun in khc nhau nh: nu phn t in cao, phn t khng in thp ngi ta gi l phng php in cao; phn t in thp, phn t khng in cao ngi ta gi l phng php in lm; phn t in v khng in cng nm trn mt phng ngi ta gi l phng php in phng; phn t in v khng in khc nhau v in tch b mt ngi ta gi l phng php in tnh in. xem xt mt khun in ngui ta cn c vo: c im ca phn t in v phn t khng in, vt liu lm khun v hnh nh trn khun l cng chiu hay ngc chiu vi t in. Mi phng php in c mt loi khun in ph hp vi n, ng thi trong cng mt phng php in ngi ta c th dng nhiu loi khun in c c im ging nhau nhng c sn xut bng cc vt liu khc nhau.

2.2. Phn loi bn in flexoBn in flexo chia lm 2 loi chnh: cao su v bn photopolymer. Cng ngh lu i nht l bn cao su khc th cng v sau l bn cao su c. Bn photopolymer dng lng v dng t ri l bc tin ch yu trong cng nghip v l cng ngh vt tri c s dng hin nay.

GVHD: Hunh Th Vit H

6


2.2.1. Bn cao su th cng Bn cao su khc th cng c rt lu trc khi bn cao su c v bn photopolymer ra i. Bn cao su khc th cng ngy nay s dng hn ch cho in mu nt kh rt ln v in trng ph. Nguyn liu ca chng l nhng tm cao su t nhin hoc nhn to c x l, thng c cng thp v dng cun th ngang 4(tng ng 1,219m) di 10 (3,048m). Khng s dng phim negative trong ch to bn in, m ton b kh bn in ca tng mu c can v c hc. Bn can v s c truyn ln b mt bn cao su bng dung dch dch chuyn. Khi , cc nt v bng bt ch s c truyn ln b mt bn cao su. b tr s ko di ra ca bn, kch thc bn in phi tng ng vi kch thc mt cong ca l gn cao su v nt can v s c truyn ln mt cong . Sau khi b mt bn cao su c can v, th khc s ct nhng nt, hnh nh c can v vi su xc ng, cng nh g v gc xin thch hp. Bn hon chnh s c g ln my in. Trong mt s trng hp, bn cao su khc th cng l phng php ch to bn in flexo nhanh nht, kinh t nht. Sau y l nhng u v nhc im ca bn cao su khc th cng 2.2.1.1. u im Bn c th in kh rt ln Bn khng bt buc phi khc kim loi hay photopolymer. Bn c c s dng ngay sau khi khc 2.2.1.2. Nhc im Can v v khc th cng l cng vic kh nhc Kch thc v phc tp ca cc k t b gii hn Tui th ca bn km hn so vi bn c hay photopolymer Cc hnh nh khc th cng khng ging nhau

2.2.2. Bn cao su c Bn in cao su c mm do, n hi v c cc phn t in nm v tr cao hn so vi phn t khng in. Chng c c t mt khun c. C th c nhiu bn in cao su ging nhau t mt khun c. Bn cao su c c lm bng cao su hoc nha. Nhng vt liu ny c tnh truyn mc rt tt, tc l phi nhn rt tt nhiu lai mc

GVHD: Hunh Th Vit H

7


khc nhau v c kh nng tch tht tt nhng lai mc ln trn b mt nhiu loi vt liu in khc nhau. Qui trnh lm bn in cao su c:

To khun gc bng cch chp phim m bn ln tm kim loi (thng bng ng hoc ma-nh) trng cht nhy sng v sau cho n mn a xt hoc ln tm photopolymer cng v ra bng nc. To khun c (matrix mold) bng nha tng hp phenolic t khun gc. c bn in cao su t khun c matrix mold

2.2.3. Bn Photpolymer Bn photopolymer l mt trong nhng i mi ch yu ca cng ngh in flexo hin i. Hnh nh c truyn t phim m bn trc tip ln b mt khun in mt cch trung thc tuyt ho. Photopolymer nhy sng vi tia cc tm, c s dng lm khun in flexo, letterpress v offset cng nh phim in th. Bn in Flexo photopolymer cng tng t nh bn in cao su c l c hai u mm do, n hi v truyn mc tuyt ho. Hin nay c nhiu h thng my ch to bn in flexo photopolymer. Bn in photopolymer c chia lm hai loi: bn photopolymer dng lng v bn photopolymer dng rn. Cu to bn in photopolymer lng: l polyester v polymer lng s c vo khun to thnh bn in hon chnh. Cu to bn in photopolymer dng rn: gm cc lp sau (hnh v theo chiu t trn xung): tm ph trn cng trong sut c th tch c, lp phim mng bo v, lp photopolymer v cui cng l lp polyester trong sut

Hnh 2-1: Cu to bng photopolymerGVHD: Hunh Th Vit H

8


2.3. So Snh 2 loi bn photopolymer dng lng v dng rnBn photopolymer dng rn c bn trn th trng dng tm trong hp cc tng c kch thc, dy v s lng theo tiu chun cho trc. Bn ny c cc cng ty sn xut hng lot v c hn s dng nhiu thng. Bn photopolymer dng lng c cc cng ty lm bn in t sn xut t cc photopolymer lng vi chiu dy ca my in flexo, thng in nt cho carton. Bn photopolymer dng lng thng c phi sng ngay sau khi c nh hnh dng tm. H thng lm bn photopolymer dng lng s dng cht ty ra (x bng...) v nc trong qu trnh lm bn, cn photopolymer dng rn th s dng dung mi hu c. Vi h thng lm bn photopolymer dng tm ra bng nc s dng mt dung dch a-xt hay kim yu, ty thuc vo lai nguyn liu. Thi gian sy ca bn ra nc vo khong t 5 n 10 pht v ch cn lm bay hi nc ra khi b mt bn in. Trong khi bn ra bng dung mi hu c cn thm thi gian cho ton b dung mi thm vo trong bn trong qu trnh ra bay hi ra ngoi. Do , thi gian sy thng lu hn (vo khong 120 pht). Chiu dy ca bn dng rn a dng t mng (1,14 mm) n dy nhiu mm. Cn bn lng ch yu c dy vi mm. Nhn chung, bn dng rn c cht lng tt v n nh hn, c th s dng cho in tng th. Bn dng lng ch yu cho in nt. Mt s u im khi s dng photopolymer lng: Gi thnh h (tit kim vt t). Chiu dy khun in c th thay i ty thuc vo tnh cht b mt vt liu in. Phim s dng c th l loi phim thng thng m cht lng ti to bi mu vn m bo.

Mt s nhc im khi s dng photopolymer lng: Thit b phi bn phc tp hn Qui trnh lm khun in phc tp hn (kh kim sot cht lng bn hn)(phi nh hnh bn thnh tm trc khi phi)

C 2 loi bn dng rn v dng lng (sau khi nh hnh dng tm) u c qui trnh lm bn chung nh sau:

GVHD: Hunh Th Vit H

9


Chp mt (khng phim)

Chp chnh (mt trc vi phim m bn)

Ra bn bng nc hoc dung mi hu c

Sy bn

GVHD: Hunh Th Vit H

10


Chp ph vi nh sng UVA

Chp x l sau cng vi nh sng UVC Ngoi ra, bn photopolymer c lai c kim loi thng dng cho in letterpress. Bn photopolymer dng ghi bn k thut s bng laser. Cu to bn ny cng nh bn photopolymer thng thng, ch thay lp phim mng bo v bng lp ph nhy nhit mu en sm (c en ln hn 4.0). Lp ny s tc dng vi nh sng laser hng ngoi to ra mt mask en-trong sut thay cho phim m bn. Sau tin hnh lm bn nh thng thng. V d: bn Nyloprint D ca BASF, bn DFS ca Cyrel Dupont.

Hnh 2-2: Bn photopolymer ghi bng laser

GVHD: Hunh Th Vit H

11


CHNG 3: CNG NGH CH TO KHUN IN FLEXO DNG BN CAO SU3.1. c im ca bn cao suBn in loi ny lm bng vt liu l cao su t nhin hay cao su nhn to. Bn ny thng c hai loi l loi bn khc c hc gm c khc th cng hoc khc in t v loi bn p gia nhit. Bn cao su trc kia dng rt ph bin ngy nay t c dng, ch cn dng trong mt s trng hp hnh nh in n gin. Loi bn cao su c cc dy thay i tu theo yu cu, bn cao su thng c d t 0,5 n 0,7cm. Khi ch to khun in Flexo dng nh phng php khc th cng ngi ta dng mt tm cao su dng lm bn c dy theo yu cu v cng t 40 - 60 shore. Sau dng dao khc khc su cc phn t khng in ta s c khun in. Phng php ny i hi ngi khc phi c kh nng nht nh. Phng php p ra nhit l ngi ta p mt tm cao su trn mt khun p vi nhit cao to thnh mt khun in.

3.2. Mng nhy sng trong ch to khun in3.2.1. Mng nhy sng trn c s mui crm Mng nhy sng l yu t rt quan trng trong cng ngh ch to khun in, n l c s truyn hnh nh ln b mt cc vt liu lm khun. Hu ht cc phng php ch to khun in dng phng php ho hc u phi dng loi mng nhy sng. Mng nhy sng c th l mng trung gian trong qu trnh ch to khun in cng c th l phn t in trn khun. Trong cc loi mng nhy sng th mng nhy sng trn c s mui crm l loi mng c s dng sm v nhiu trong hu ht cc qu trnh ch bn dng phng php ho hc khi ch to khun in offset, ng ng, in li... Mng nhy sng l mt loi mng c bit, chng c th thay i mt s tnh cht no khi b nh sng c bc sng ph hp tc dng vi thi gian nht nh.GVHD: Hunh Th Vit H

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Khi trng ln b mt vt liu n c kh nng dn tri v bm chc trn b mt vt liu. Khi sy kh, mng ny d dng tan trong nc nhng khi chiu nh sng c bc sng thch hp ln mng, mng mt kh nng tan trong nc. Chnh hai c im ny m mng nhy sng trn c s mui crm c dng nhiu trong cng ngh ch to bn in. Mng keo nhy sng thng gm nhiu hp cht kt hp vi nhau, trong quan trng nht l thnh phn to mng v thnh phn nhy sng. Mng nhy sng trn c s mui crm, da trn hp cht nhy sng l mui crm crm c ho tr +6 (Cr+6). Trong mng nhy sng trn c s mui crm gm hai thnh phn chnh l cht to mng v cht nhy sng. Cht to mng ngi ta thng dng l mt s cht hu c c ngun gc thc vt nh gm arabic hoc ngun gc ng vt nh keo gelatin hoc cht keo tng hp. Hin nay mng keo ngi ta thng s dng l keo tng hp Polyvynyl Ancohl (P.V.A), y l hp cht cao phn t c cu trc (- CH2 CHOH CH2 - )n, P.V.A c cu trc dng si kt ni vi nhau. Cht ny c dng ht trng, xp, tan trong nc 80C thnh mt dung dch trong sut khng mu c nht cao. Hp cht cao phn t P.V.A c iu ch bng con ng chuyn ho polyme tng t vi n nh polyme axetat c a vo thu phn nhit 6570C trong mi trng kim v ru

. Thnh phn th hai l cht nhy sng, cht thng dng l Dicomatamn (NH4)2Cr2O7 hoc Dicromatkali K2Cr2O7. Nhng cht ny c dng ht xp mu vng cam, tan trong nc nhit thng thnh dung dch mu vng cam, trong hp cht ny crm c ho tr +6, l rt d b oxi ho thnh crm c ho tr +3 khi c tc dng ca nh sng. Hai hp cht trn u mang tnh cht nhy sng nhng ca Amondicromat mnh gp 7 ln ca Kalidicromat nn trong thc t ngi ta ch yu dng cht nhy sng l Amndicromat. Hp cht ny d b nh sng tc dng bin thnh cht khc nn phi trong bng ti. pH ca dung dch nhy sng cng nh hng ti kh nng nhy sng ca mng, vi mng keo dng P.V.A pH phi ln hn 5, khi pH ca dung dch nhy sng tng ln th nhy sng ca dung dch gim nhng vic bo qun li tt hn. Dung dch nhy sng dng mui crm c th trong ti hng tun nhng khi ph ln bnGVHD: Hunh Th Vit H

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th chng ch c th nhy sng sau vi gi do hin tng phn hu phi nh nh sng. Tnh cht quan trng nht ca mng nhy sng l tnh cm quang, di tc dng ca nh sng Cr+6 bin thnh Cr+3, cc Cr+3 to thnh s lm mt kh nng tan trong nc ca mng keo. Tnh cht nhy sng ca mng keo ph thuc vo bn cht loi keo to mng c s dng, loi cht nhy sng pha dung dch v nng ca chng. Khi tng nng mui crm th kh nng nhy sng tng, tuy nhin nng ny ch trong mt gii hn nht nh, mi mt n v cht to mng ch c mt lng cht nhy sng nht nh, t l ny thng dao ng trong khong 1/10. Nu lng cht nhy sng khng s khng ng rn c ton b mng keo nhy sng trn bn, nu lng ny vt qu gii hn s tc ng xu ti mng keo nh: cht nhy sng s kt tinh trn b mt mng keo kh, h s tng phn gim, d to thnh mt ph trn bn, tng kh nng ng rn ca bn trong ti, lm mng keo ng rn khng khng n nh, thm ch lm gim kh nng ng rn ca mng keo. 3.2.2. Mng nhy sng trn c s hp cht Diazo 3.2.2.1. Hp cht Diazo Hp cht Diazo l mt hp cht hu c, n gm nhiu loi khc nhau v c s dng trong nhiu lnh vc khc nhau. Trong , loi s dng trong cng ngh ch to khun in Offset l loi hp cht hu c trong phn t c 2 nguyn t Nit kt hp trc tip vi nhau dng mch thng chng c nhm chc (-N=N-). Diazo c cu to l hp cht Ion(-N+ N) lin kt Diazo l mt nhm 2 nguyn t Nit kt hp vi gc Cacbonhydro. Thng thng gc ny l vng nhn thm nh C6H5 v dn xut hoc C10H7 thng th ho tr th 2 ca nhm Nit kt hp vi mt ion m no nh Cl-, NO3- , nhng loi ny thng tan trong nc. Ngoi kiu cu trc trn cn c nhng lin kt m cu trc gia cc nguyn t Nit khc nh N=N hoc =N=N, lc ta thy thnh phn Diazo khng c ion m v c, nhm Diazo y lin kt vi vng nhn thm. v d lin kt Octho v paraquinomdiazit.

Lin kt Diazo loi quinomdiazit trn khng tan trong nc m ch tan trong dung mi hu c. Nh vy nu trong phn t ca chng c cha nhm c cc nh SO 3H hoc SO3Na th lin kt Diazo loi quinomdiazit s tan trong nc

GVHD: Hunh Th Vit H

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Phn ng quan trng nht ca hp cht Diazo c dng trong cng ngh ch bn l phn ng quang ho, lin kt Diazo loi vng thm khng bn vng v b nh sng phn hu cc mc khc nhau, ngi ta gi l tnh cm quang ca lin kt Diazo. a s nhng lin kt Diazo u b phn hu nh sng c bc sng t 360400 nm tu thuc vo cu trc ca lin kt Diazo v iu kin chiu sng m xy ra nhng phn ng khc nhau. Thng thng kt qu phn ng quang ho l lin kt Diazo b ph hu gii phng Nit. i vi lin kt Diazo loi quinomdiazit khi b nh sng tc dng n s ph v vng thm to thnh axit Cacboncilic.

3.2.2.2. c im ca mng Diazo c trng ca mng keo nhy sng Nhng c trng ca cc bin i quang ho ca cc hp cht octquinondiazit, cng nh kh nng to thnh mng k nc v b phn hu do tc dng ca mt s dung dch nh xt trong qu trnh hin hnh hoc n mn (vi bn nhiu lp). Lp nhy sng cn phi c bn ho hc cao, tnh cch in tt, k nc cao v bn c hc ln. Thnh phn ca lp nhy sng

GVHD: Hunh Th Vit H

15


Vic to thnh lp nhy sng da trn c s hp cht oct-quinondiazit bao gm vic la chn cht nhy sng, cht to mng bo m cho lp nhy sng c nhy cao, kh nng phn gii cao, chnh xc hnh hc ca vic phc ch (nht l cc nt nh, im Tram), dy ca mng, kh nng bm dnh tt vi lp , bn c hc v ho hc cao. p ng tt nht cc yu cu k trn l nha phenol formandehid, nha ny c cu trc phng, l loi nha do, ho tan tt trong nhiu dung mi v c tnh cht to mng cao. Vic th nghim nha novolac vi oct-quinondiazit ch ra rng vic a nha vo lp nhy sng lm tng tnh to mng ca dung dch, ng u ca mng, tnh chu axit tt. Tuy nhin do tnh ho tan ca nha novolac trong cc dung dch kim, lp nhy sng tr nn rt nhy vi tc dng ca cht hin v gi tr pH ca dung dch hin. Mt trong nhng cch nng cao bn vng ho hc l thm cc cht ph lm tng bm dnh v tnh k nc ca mng.

La chn dung mi. Bn cht ca dung mi c dng ch dung dch nhy sng nh hng nhiu n n nh ca dung dch nhy sng khi bo qun, n qu trnh to mng v n tnh cht ca chnh mng nhy sng. Tn ti nhiu dung mi hu c khc nhau v cu trc ho hc, tnh cht ho hc, nhit si, tc bay hi, c Cc tiu chun la chn dung mi l: phi dng loi t c hi, c kh nng to thnh dung dch bn vng v mt nhit ng hc vi tt c cc cu t v tng i ph bin. S hnh thnh mng nhy sng Qu trnh to mng, cc iu kin hnh thnh mng nhy sng nh hng mnh ln tnh cht ca lp: s bm dnh vi , bn c hc, tnh cht hin, n nh, cc ch s theo thi gian. Vic ph lp l giai on u tin ca vic hnh thnh mng nhy sng. N bao gm t vic thm t b mt , phn b dung dch v bay hi mt phn dung mi, ngha ch yu ca giai on ny l to thnh mt mng ng u vi chiu dy xc nh, iu ny c quyt nh bi nht ca dung dch v tc phn b lp. Ngun sng phn hu hp cht Diazo. Vic la chn ngun sng ti u l mt vn rt quan trng trong cng ngh ch to bn in. Cch y khng lu trong cng ngh in s dng rng ri n h quang vi cc i pht x nm trong vng 350-480 nm. iu ny ph hp vi mng ph ccGVHD: Hunh Th Vit H

16


i ca oct-quinondiazit l 400nm. Tuy nhin n h quang mc hng lot cc nhc im: cng sng khng cao, dao ng nhit mu, lm bn mi trng, khng thun li khi s dng nn ngi ta khng dng na. Ngy nay ngi ta dng n Halogen kim loi (MHL). Bo qun bn in ph mng keo nhy sng Diazo Thi hn bo qun cc mng nhy sng l Diazo thng trn 2 nm trong cc iu kin chun (ch mt tri khng chiu trc tip, khng c bc x cc tm, kh ro, m tng i 50%, nhit 18- 20C). Khi bo qun khng ng tiu chun xy ra cc s ph hu mng nhy sng dn n cc khuyt tt khi ch bn nhiu khi ph hu hon ton l bn . Thut ng lo ho bn in c hiu l t hp cc bin i vt l v ho hc xy ra trn bn trng sn dn n vic mt mt cc tnh cht lm vic cn c mt bn in trng sn.

3.3. Cng ngh ch to khun in flexo bng phng php p ra nhitPhng php p ra nhit gm hai giai on chnh: giai on ch to khun c v giai on p to bn cao su. Phng php ny c th ch c nhiu bn in ging nhau trn c s mt khun c. Cc loi bn u c lm t mt tm cao su sng, khi p vi nhit nht nh s to thnh bn cao su vi cng ph hp vi in flexo. Trc khi ch to khun in flexo ngi ta phi chp nh bn mu ly phim, sp ch ni dung, in thnh phim m bn. Sau bnh ghp cc hnh nh, ch theo tng khun in c th, to thnh t mu phi m bn dng ch bn in Flexo. 3.3.1. Ch to khun p Vt liu lm khun p bn thng l hn hp ca ba thnh phn chnh l: nha pleno focmandehit, xenlulo v cc si khong cn thnh tm gi l bn nha plenolic. Vt lu ny c sy nhit 600 C trong khong 30 pht loi b hi nc v lm mm n trc khi p. t bn nha plenolic ln khun kim loi va to ra bng dung dch n mn, p bn nhit 150 n 2550 C trong thi gian t 8 n 10 pht. iu chnh lc p ngi ta iu chnh b phn s (4)

GVHD: Hunh Th Vit H

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Hnh 3-3: S qu trnh p to khun p (Matrix) 3.3.2. Ch to khun in Flexo y l giai on trc tip to ra bn in bng cao su. Cc hp cht c s dng trong qu trnh ch to bn cao su bao gm cao su t nhin, buna N, putyl, styrene, ethylene, propiren, neopren, v hp cht ca buna N, vi cc cht n hi khc. Tu theo yu cu khi s dng bn, ngi ta s thay i thnh phn hn hp c c cc c tnh mong mun. Hn hp ca cao su c pha trn v cn thnh tm c dy theo yu cu ch to khun in. Vt liu cao su c sy s b trc khi p gia nhit. t vt lii ln khun p (matrix) v t trong thit b p, p tm cao su nhit 1550c, thi gian khong 10 pht. Hon thin bn: Bn sau khi p thi gian, ly ra v ct b cc ba-via (mp tha), kim tra bn, sa cc li nu c 3.3.3. Trnh t lm bn in flexo Chun b - Chun b phim m bn ct bn in theo kch thc thch hp. Chp mt - Qu trnh chp mt bn in bng n UV, qu trnh ny quyt nh dy ca lp .

Chp mt in - Qu trnh chp mt in ca bn bng n UV, to cc chi tit in.GVHD: Hunh Th Vit H

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Hin bn in Qu trnh ra b cc phn photopolymer cha lu ha bng dung mi hoc nc lm hin cc chi tit in.

Ra bn in Ra bn loi b cc phn cao su cha lu ha.

Thm kh Thm kh bn bng cc loi vi khng cha x loi b lng dung mi cn st li.

Kim tra Kim tra li trn mt bn in, x l cc im polymer cn st li bng cch lau bng khn c thm dung mi sch.

GVHD: Hunh Th Vit H

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Chp chng dnh bn in Lm cng bn tng tui th v chng dnh cho bn in.

Chp thnh phm Chp nguyn bn c phn in v khng in tng cng tui th th bn in, tng kh nng chu ma st vi mc in cho bn

Hnh 3-4: Trnh t lm bn in flexo

GVHD: Hunh Th Vit H

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3.3.4. Cng ngh tm tt khi ch to khun in cao su

Hnh 3-5: Cng ngh tm tt khi ch to khun in cao su

3.4. Cng ngh ch to khun in flexo bng tm photpolyme3.4.1. Mng nhy sng trn c s hp cht photopolyme Trong cng ngh ch to khun in ngi ta cn dng mt mng nhy sng trn c s hp cht hu c cao phn t, chng c kh nng thay i mt s tnh cht no di tc dng ca nh sng. Nhng cht nh vy gi l hp cht photopolyme, cc hp cht photopolyme thng c dng ch to khun in Flexo v khun in offset. Khi dng ch to khun in Flexo hp cht photopolyme cng ging nh cc mng nhyGVHD: Hunh Th Vit H

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sng khc chng gm 2 thnh phn chnh l thnh phn to mng v thnh phn nhy sng. Thnh phn to nn dng ch to khun in flexo l hp cht polyamit m trong thnh phn c nhm (-CO-NH-). Cc cht photopolyme thng c tng hp bng phng php ngng t ng th cc axit tng ng hoc ngng t d th cc axit dicacbonxylic

S nguyn t ccbon trong gc ph thuc vo cc cht ban u, cu trc dng khng gian ca cc polyme dn n thay i tnh cht v nhit ho tan ca chng Thnh phn nhy sng l thnh phn to ra s thay i ca photopolyme khi nh sng tc dng. Khi c nh sng tc dng ln hp cht photopolyme, thnh phn nhy sng s hp th nh sng v hot ho to thnh gc c kh nng phn ng, khi cc gc sinh ra tng tc vi nhau, qu trnh ny to ra ozn.

Cc phn t hot ng thng l Benzen, Hidroquinon, Benzenfenon... khi l sng cc cht ny b phn gii thnh gc t do, sau c tc dng khi mo qu trnh polyme ho. Qu trnh polyme ho dn ti lin kt cc polyme theo ni i v nhm c kh nng phn ng. Khi b tia UV chiu ti, photopolyme s tham gia phn ng quang ho to li v c cng li. Qu trnh to li c th xy ra mch nhnh hoc mch chnh tu theo cu to ca tng loi polyme.GVHD: Hunh Th Vit H

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Qu trnh tng hp ny quyt nh cht lng ca bn in photopolyme, n ph thuc vo cc yu t: bn cht ca polyme, cng sut n chiu, bc sng nh sng chiu, thi gian chiu v khong cch n chiu. c im chung ca nhng hp cht nhy sng photopolyme: chng va l nn c s ca khun in va l phn t in i vi khun in Flexo; vi khun in offset n l phn t in c bm trn b mt lp kim loi lm . Trong qu trnh ch khun in ngi ta dng nhiu cc vt liu photopolyme c mt s tnh cht khc nhau nh: c th tan trong nc, hoc tan trong mt s dung mi hu c. Khi trong cng ngh ch to khun in ngi ta s dng cc dung dch hin bn tng ng. Tt c chng u c cc tnh cht l: khi b nh sng chiu ti vi thi gian ln th chng s tham gia phn ng quang ho v kt qu ca phn ng quang ho l lp photopolyme ng cng li v mt kh nng tan trong nc hoc dung mi hu c nh hp cht photoplyme ban u cha b nh sng tc dng. Hp cht photoplyme dng ch to khun in phi c tnh nhy sng va phi, c mt s tnh cht tho mn cc iu kin ch to khun in v in ca cc phng php in c th, l kh nng: chu c tc dng ca cc ho cht khi gia cng trong ch to khun in v trong qu trnh in, c kh nng bt v nh mc tt, bn vi mc in v dung dch lm m trong in offset t, chu c lc c hc trong qu trnh in, khng gy c hi cho ngi sn xut v mi trng. 3.4.2. c im ca bn photopolyme Hin nay ch to khun in flexo ngi ta ch yu s dng vt liu l cc hp cht polyme nhy sng. Khi s dng loi vt liu ny c hai loi l photopolyme dng dung dch (dng lng) v photopolyme dng tm. Loi photopolyme dung dch phiGVHD: Hunh Th Vit H

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qua hai qu trnh: to ra tm photopolyme theo chiu dy nh trc v qu trnh ch to khun in flexo. Loi ny cng ngh ch khun tng i phc tp, nhng gi thnh thp hin nay cng t dng phng php ny, m ch yu dng loi photopolyme dng tm. Chng gm hai loi c v khng c .

Hnh 3-6: Bn photopolyme 3.5. Cu to bn photopolyme

Lp bo v c tc dng bo v lp photopolyme chng bi, xy xt b mt trong qu trnh bo qun v s dng. Lp lin kt lm nhim v tng bm dnh ca lp photopolyme vi lp sau khi chiu sng. Lp c th c lm t Polyeste hoc kim loi, loi c c bn cao, gim s gin di, thch hp vi in loi sn phm c s lng in ln. Lp nhy sng photopolyme: lp ny va l lp nhy sng va l phn t in trn bn. Lp ny gm ba thnh phn chnh: polyme c ni i trong mch, polyme mch thng v cht khi mo (cht nhy sng) ngoi ra cn c cc cht mu v cht n nh. Bn photopolyme c chiu dy khong t 0,8 3,5 mm. Tm photopolyme khi b nh sng tm (UV) chiu vo vi thi gian ln s xy ra phn ng quang ho to li lm ng rn lp photopolyme, khng tan trong dung dch hin v l phn t in trn bn.

3.5.1. Cng ngh ch to khun in dng photopolyme lng Khi ch to khun in dng photopolyme dng lng phi dng mt thit b chuyn dng n gm cc bc cng ngh sau: Gn phim m bn v to mng bo v: y l qu trnh to ra lp mng bo v lp photopolyme. Ly phim m bn c hnh nh cn in t ln mt tm knh trong sut, mt thuc ca phim m bn nga ln pha trn. t tip mt mng mng trong sut ln phim m bn, lp mng ny c p cht ln phim m bn bng lc ht chn khngGVHD: Hunh Th Vit H

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Hnh 3-7: Gn m bn To lp photopolyme lm bn in: y l qu trnh to ra lp photopolyme lm bn in. Khay cha dung dch photopolyme chuyn ng trn b mt lp bo v v trng mt lp photopolyme lng ln b mt lp bo v. Dao gt, gt trn b mt to ra dy nht nh v ng u ca lp photopolyme. Tip dng mt l cn lp vt liu lm ln lp photopolyme

Hnh 3-8: To lp photopolyme Chiu sng pha sau: Chiu sng pha sau nhm mc ch ng rn lp photopolyme lm ca bn in flexo. Khi dng nh sng c bc sng ngn (l = 260nm) chiu ln ton b mt bn khng qua phim m bn, nh sng s lm ng rn lp photopolyme, khng tan trong dung dch hin. Thi gian phi tu thuc vo dy ca lp bn sau ny. Chiu sng pha trc: Chiu sng pha trc nhm mc ch ng rn lp photopolyme nhng ch phn t in. y l qu trnh dng nh sng tm (l=260nm) chiu ln lp photopolyme thng qua phim m bn. Ti nhng ch phn t in nh sng i qua phim m bn, lm ng rn lp photopolyme li, khng tan trong dung dch hin hnh. Thi gian phi phi ng rn ton b lp photopolyme ti cc phn t in

GVHD: Hunh Th Vit H

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Hnh 3-9: Qu trnh phi pha trc to phn t in Hin hnh: Hin hnh nhm mc ch loi b lp photopolyme khng b nh sng tc dng ti cc phn t khng in trn bn. Trc khi hin c th thu li dung dch photopolyme khng b nh sng tc dng. Khi hin hnh c th lm bng tay, hoc bng my. Dung dch hin c th l nc hoc mt dung mi hu c tu thuc vo loi photopolyme dng ch bn in. Hon thin bn: y l qu trnh tng cng ca bn n cn thit khi in. Bn sau khi hin xong c chiu sng bng nh sng UV (l= 254nm) sau sy kh bn. 3.5.2. Cng ngh ch to khun in dng tm photopolyme Cng ngh ch to khun in Flexo dng photopolyme dng tm c thc hin bng nhng thit b chuyn dng nh my phi, my hin v my sy... Cng ngh ny gm 5 bc c bn ni tip nhau: Chun b phi pha sau phi pha trc hin hnh - hon thin: 3.5.2.1. Chun b: (preparation) Kim tra ton b phim m bn v hnh nh v kch thc, en ca cc phn t khng in v v tr ca cc hnh nh cn in, nhng ch khng en phi dng bt em ph kn. Phn t in phi m bo trong sut khng c cc vt bi, bn... Ct vt liu photopolyme thnh nhng kch thc theo yu cu ca bn cn lm, hnh nh trn bn phi cch ng ct 1,2cm, vt ct phi sc cnh, vung gc, thng, khng lm xc hoc lm bn. 3.5.2.2. Phi pha sau (Back Exposure) Phi pha sau nhm mc ch ng rn mt phn ca tm photopolyme lm bn sau ny v tng kh nng bm dnh ca lp photopolyme vi lp bn. y l qu trnh dng nh sng tm (l= 360nm) chiu ln ton b mt sau ca tm photopolyme. Khi nh sng chiu vo s lm kt li lp photopolyme lm n cngGVHD: Hunh Th Vit H

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li v khng tan trong dung dch hin. Khi phi pha sau t p bn vo khung phi, c th khng cn ht chn khng. 3.5.2.3. Phi pha trc (Face Exposure) Phi pha trc nhm mc ch to cc phn t in trn bn. y l qu trnh dng nh sng UV (l= 360nm) tc dng ln lp nhy sng photopolyme thng qua t phim m bn. Ti nhng ch phn t khng in nh sng khng tc dng ln lp photopolyme, ti phn t in nh sng i qua phim m bn v gy ra phn ng quang ho to li lm ng rn lp photoolyme v khng tan trong dung dch hin. tin hnh phi pha trc ngi ta phi t phim m bn vo pha truc ca bn, lt ngc phim m bn, lau sch b mt phim, bng dung dch lau phim. Bc lp mng bo v trn tm photopolyme, t m bn ln b mt tm photopolyme, mt thuc p xung, ti cc vng mp bn ngoi phim m bn khng che ph kn ht phi dng cc di bng Polyeste ph ln m bo cho qu trnh ht chn khng c tt nht. Ko tm ph palastic ln vt liu v vut nh bng trc cao su lm cho phim m bn tip xc tt nht vi tm potopolyme. 3.5.2.4. Hin hnh (Wash out) Hin hnh l qu trnh ty b lp photopolyme cc phn t khng in khng b nh sng tc dng ra khi bn lm cho n thp xung. Bn cht ca qu trnh ny l qu trnh ho tan ca hn hp photopolyme khng b nh sng tc dng trong dung dch hin l nc hoc hp cht hu c. Hin hnh c th lm bng tay hoc bng my hin. Chun b dung dch hin: Mi mt loi bn photopolyme s c dung dch hin tng ng. Vi loi hin bng dng mi hu c thng l hn hp ca percloetylen (C2Cl4) v butanol (n - C4H9-0H). 3.5.2.5. Sy kh (drying). Sy kh l mt qu trnh bt buc trong cng ngh ch khun in Flexo, n lm cho bn kh v cng li v tr v vi dy tht ca bn. Nu khng sy bn s b dnh, mm khng s dng c. Trc khi sy bn phi bt my sy khong 30 pht nhit n nh. Nhit sy bn t 60 500C t thi gian sy bn, thi gian sy bn phi m bo kh bn, thi gian ny tu thuc vo dung dch hin s dng: nu dung dch hin percloetylen/butanol l 1,5 gi, dung dch hin optisol khong 2,0 gi. Khi sy bn t bn vo ngn sy v y li. Sau thi gian sy ngn c th kim tra, lau chi bn GVHD: Hunh Th Vit H

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loi b lp mng mng c th cn li trn b mt bn, nu khng b mt bn s xut hin lp mu da cam. Sau khi sy kh hon ton ly bn ra lau chi lng bn bng dung dch lm sch v khn lau mm. Kim tra cng v dy ca bn bng thit b o. 3.5.2.6. Hon thin bn (Post Exposure) y l qu trnh dng nh sng tm chiu ln bn hoc dng mt s dung dch ho cht xoa ln b mt bn nhm mc ch tng kh nng chu tc ng ca ng sng ban ngy v ca dung dch ra bn khi in, tng nhn mc ca phn t in, gim dn di ca hnh nh. Khi hon thin bn ngi ta thng s dng phng php chiu sng bng cch a bn vo my phi v chiu sng ln bn bng ng sng tm UV- C (l=254nm) lc chiu sng khng cn ht chn khng 3.5.2.7. Tiu chun k thut ca bn in Flexo Hnh nh trn bn phi y , r nt, c cao ph hp vi hnh nh in v my in. Cc phn t in phi trung thc vi phim m bn. Cc phn t khng in phi c su cn thit khi in khng b bn. Hnh dng ca cc phn t in phi ph hp vi dn di hnh nh khi in. B mt cc phn t in phi phng, khng c vt xc, li lm. dy ca bn phi ng u v ph hp vi my in. cng ca bn ph hp vi hnh nh (t 40 60 Shore). Trn bn phi c cc du ch dn ca bn v cc du c (+) chng mu. Bn khng b nh hng bi mc in v dung mi. 3.5.2.8. Bo qun bn in

Bn phi ni kh, lnh, ti v trn cc gi bn, khng nn chng cc bn ln nhau, mi bn cn c tm ph bn ngoi hoc trong hp. Lm sch bn trc khi bo qun. Khi lm sch bn nn dng bn chi lng mm ngn. Khng b gp bn 1800, khng lm cong bn, khng bn b xon li khi bo qun. S dng ng loi dung mi bo qun bn do nh cung cp bn cung cp.GVHD: Hunh Th Vit H

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KT LUN

Hin nay nhu cu trang tr v qung co kh ph bin, do vic nghin cu tm ra loi mc mi a vo sn xut l rt ph hp vi th trng. Tuy nhin pht trin v lu di th cn tin hnh cc th nghim vi cc loi bn in khc nhau d tm ra ngun nguyn liu r, nhng vn t cht lng ph hp vi yu cu mi ngi u c th dng nhng sn phm c cht lng. Ngy nay mc in v ngnh in n gp mt phn ht sc quan trng v a dng trong cuc sng, do nhng tnh nng ht sc u vit ca chng. Bn cnh chng cng mang li nhng h ly ht sc nang gii. Tm thi trc mt, ngay lp tc chng ta khng th thay th hon ton chng, nhng trong tng lai s l iu tt yu, thay th dn bng nhng vt liu c thi gian phn hy nhanh hn, thn thin hn vi mi trng v con ngi.

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TI LIU THAM KHO[1]. Nhiu tc gi, Vt liu nha v ng dng, Trung tm k thut cht do - S cng nghip TP. HCM, 2005. [2]. Ti liu ni b ca cng ty SAKATA INX. [3]. SpecialChem Adhesives, Adhesion Guide.htm [4]. Nguyn Hon , K thut Phi - Mi bn trong ngnh In, NXB KHKT [5]. http://www.congnghein.org/ [6]. www.kithuatin.com.

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