Presentation Advanced

7/23/2019 Presentation Advanced

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P L A S T I C

I N J E C

T I O N

M O L D

I N G

T Y P E

O F

P L A S T

I C I N

J E C T I

O N

M O L D

I N G

& I T S

C Y C

L E



DIFFERENT TYPES OF

INJECTION MOLDING• Co-injection(sandic!"#o$din%

• F&si'$e($ost so$&'$e"co)e injection#o$din%

• Gas-assisted injection #o$din%

• In-#o$d deco)ation and in #o$d$a#ination

• Injection-co#*)ession #o$din%

• Injection #o$din% o+ $i,&id si$icone )&''e)

• Inse)t and o&tse)t #o$din%

•

La#e$$a) (#ic)o$ae)" injection #o$din%• Lo-*)ess&)e injection #o$din%

• Mic)oinjection #o$din%

• Mic)oce$$&$a) #o$din%

• M&$tico#*onent injection#o$din%(o.e)#o$din%"

• M&$ti*$e $i.e-+eed injection #o$din%

• Pode) injection #o$din%

•

P&s!-P&$$ injection #o$din%• Reaction injection #o$din%

• Resin t)ans+e) #o$din%

• R!eo#o$din%

• St)&ct&)a$ +oa# injection #o$din%

• St)&ct&)a$ )eaction injection #o$din%

•

T!in-a$$ #o$din%• /i')ation %as injection #o$din%

• 0ate) assisted injection #o$din%

• R&''e) injection



Custom PlasticsInjection moldin

g- Well suited for high-quality, high- volume part manufacturing.

#ost .e)sati$e o+ a$$ injection #o$din% tec!ni,&es1

.a) in si2e and a)e )ated 'ased on *)ess&)e o) tonna%e1

#an t*es o+ *$astic )esins and additi.es &sed to inc)ease its 3e4i'i$it +o) desi%ne)s and en%inee)s1

t!e)e a)e #an en!ance#ents and c&sto#i2ation tec!ni,&es t!at can 'e &sed to *)od&ce t!e desi)ed5nis! and st)&ct&)e1 Injection #o$ds !ic! a)e &s&a$$ #ade +)o# stee$ contain ca.ities t!at i$$ +o)#t!e *a)ts1 Me$ted *$astic is injected into t!e #o$d 5$$in% t!e ca.ities1 T!e #o$d is coo$ed and t!e

*a)ts a)e ejected ' *ins1 T!is *)ocess is si#i$a) to a je$$o #o$d !ic! is 5$$ed t!en coo$ed to c)eatet!e 5na$ *)od&ct1

T!e #o$d #a7in% costs a)e )e$ati.e$ !i%!8 !oe.e) t!e cost *e) *a)t is .e) econo#ica$1

Lo *a)t cost a$on% it! )esin and 5nis! o*tions !a.e a$$ cont)i'&ted to injection #o$din%9s *o*&$a)it

in toda9s #an&+act&)in% $andsca*e1

MOLDING



TYPES OF INJECTIONMOLDING

Blo !olding" Well suited for hollo o#jects, li$e #ottles

Fo$$os 'asic ste*s +o&nd in %$ass '$oin%1

A *a)ison (!eated *$astic #ass %ene)a$$ a t&'e" is in3ated 'ai)1

T!e ai) *&s!es t!e *$astic a%ainst t!e #o$d to +o)# desi)eds!a*e1 Once coo$ed t!e *$astic is ejected1

:i%! .o$&#e One-*iece !o$$o o'jects

C)eates .e) &ni+o)# t!in a$$ed containe)s e4t)e#e$econo#ica$

I1e18 ;ott$es




Compression!olding " Well suited for larger o#jects li$e auto

parts.

A !eated *$astic #ate)ia$ is *$aced in a !eated #o$d

Co#*)essed into s!a*e1

P$astic can 'e in '&$7 '&t &s&a$$ in s!eets1

C&)in% (!eatin% *)oc" to #aintain its inte%)it1

Re#o.ed +)o# t!e #o$d1 I+ s!eetin% *$astic #ate)ia$ is &sed t!e #ate)ia$ is 5)stt)i##ed in t!e #o$d t!en )e#o.ed1

:i%!-st)en%t! co#*o&nds ie8 t!e)#osettin% )esins 5'e)%$ass and )ein+o)ced *$astics1

In.a$&a'$e *)ocess +o) t!e a&to#oti.e ind&st)1



TYPES OF INJECTION

MOLDING%&trusion !olding" Well suited for long hollo formed applications li$e tu#ing,

pipes and stras.

E4t)&des t!e #e$ted *$astic di)ect$ into a die1

T!e die s!a*e not a #o$d dete)#ines t!e s!a*e o+ t!e 5na$*)od&ct1

T!e e4t)&ded <t&'in%= is coo$ed and can 'e c&t o) )o$$ed +o)

s!i*#ent1




'otational!olding

('otomolding)" Well suited for large, hollo, one-piece parts.

>ses !i%! te#*e)at&)es and )otationa$ #o.e#ent to coat t!e inside o+ t!e #o$d and +o)#t!e *a)t1

T!e constant )otation o+ t!e #o$d c)eates cent)i+&%a$ +o)ce +o)#in% e.en-a$$ed *)od&cts1

S&ited to $a)%e !o$$o containe)s s&c! as tan7s s$o *)ocess1

:oe.e) .e) econo#ica$ *)ocess +o) *a)tic&$a) a**$ications and can 'e c!ea*e) t!anot!e) t*es o+ #o$din%1

/e) $itt$e #ate)ia$ is asted &sin% t!is *)ocess and e4cess #ate)ia$ can o+ten 'e )e-&sed#a7in% it an econo#ica$ and en.i)on#enta$$ .ia'$e #an&+act&)in% *)ocess1




C*+CI*+• Eac! t*e !as its strengths and ea$nesses1

•

;e aare o+ t!e functions o+ eac! t*e to +&$5$$ t!eneed o+ t!e #an&+act&)e)

• /arious di0erent a**)oac! +o) #an&+act&)in%

so$&tion

• S!o&$d %et

insightful consultsa'o&t

a**$ications and suita#le materials'e+o)e *)oceedin% it! one #an&+act&)in% *)ocess



Mo$dC$osed

Po$#e)

Injection

Mate)ia$S!)in7a

%e

>nsc)eo+ Mo$d

Coo$in%and

Re#o.a$

INJECTION MOLDING CYCLE Mo$d is c$osed

Injection o+ t!e*o$#e) into t!e

#o$d ca.it &nti$t!e ca.it is 5$$ed

!o$din%*)ess&)e is#aintained toco#*ensate+o) #ate)ia$s!)in7a%e

0!en sc)et&)ns ne4t s!ot is+ed to t!e +)ontsc)e1 T!isca&ses t!e sc)eto )et)act as t!ene4t s!ot is

0!en sc)et&)ns ne4t

s!ot is +edto t!e +)ontsc)e1 T!isca&ses t!esc)e to)et)act as

t!e ne4ts!ot is*)e*a)ed



P L A S T I C

I N J E C

T I O N M O

L D I N G

I N J E

C T I

O N

A N D C L

A M P I

N G

> N I T

S



INJECTION >NIT

1 method of injection2

- hydraulic plunger- rotating scre (e&truder)

3unction2

- 4etermine the amount of molten plastic entering the moldcavity (shot)

- 3ill mold cavity ith molten plastic - !elt plastic pellets into molten form



ROTATING SCRE0 MET:OD



:YDRA>LIC PL>NGER



F>NCTION OF TORPEDO

5he function of the torpedo in the heating 6one is to spread the

polymer melt into thin 7lm in close contact ith the heatedcylinder alls. 5he 7ns, hich $eep the torpedo centered,also conduct heat from the cylinder alls to the torpedo,although in some machines the torpedo is heated separately



CLAMPING >NIT

3unction2

- 5o hold and press the mold together

Considerations2

- a high 7lling pressure acts on the inside of the cavity.

- parting surfaces of the mold try to e&pand outard due tothis

pressure

- it is necessary to clamp the mold so that it does not open

- 8ash ill #e generated if the parting surfaces open evenvery slightly



TYPES OF CLAMPING >NIT

5oggle clamp

9ydraulic clamp



CLAMPING AND INJECTION PROCESS

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