Polypropylene Manufacture

8/17/2019 Polypropylene Manufacture

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POLYPROPYLENE

History of Polyprpylene

By using high pressure techniques in the 1930’srese!rch

in poly"er che"istry le# to the poly"eri$!tion of ! for"

of polyethylene in Engl!n#% &lti"!tely this le# to the

in#epen#ent initi!l #e'elop"ent of polyethylene un#er

lo( pressure techniques in )er"!ny

*hese !n# other pro#ucers h!'e est!+lishe# pl!nts

c!p!+le of pro#ucing "illions of poun#s of polypropylene

,+er%

Ho(e'er (ith continue# i"pro'e"ents !n# soun#consu"er e#uc!tion polypropylene ,+er is ,n#ing ! goo#

"!r-et for such #i'erse pro#ucts !s rope rugs s(e!ters

hosiery sl!c-s !n# other !pp!rel%


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.E*HO/ O .N&2*&RE

*he pro#uction of polypropylene ,+er '!ries !"ong the

"!nuf!cturers%

n f!ct in#i'i#u!ls "!nuf!ctures h!'e '!ri!tions in their

processes to !chie'e cert!in properties such !s

#ye!+ility light st!+ility he!t sensiti'ity !n# sh!pe of the

,l!"ent cross section%

*he +!sic proce#ure !s illustr!te# in igure 4561 is to

poly"eri$e propylene g!s (ith the !i# of !n !ppropri!te

"et!l co"poun# such !s tit!niu" chlori#e in ! #iluent% *he poly"er for"e# fro" the propylene is slurrie# in the

#iluent to #eco"pose the c!t!lyst !n# is then

,ltere#puri,e# !n# re#uce# to po(#er for" !s

polypropylene resin% ##iti'es "!y +e inclu#e# in the

resin to st!+ili$e the rel!ti'ely lo( inherent he!t !n# light

#egr!#!tion properties of polypropylene%

*he resin is "elte# !n# e7tru#e# through ! spinneret in,l!"ent for"%

*he ,l!"ents !re then tre!te# !n# #r!(n to get the

proper cryst!llinity !n# "olecul!r orient!tion in or#er to

o+t!in such #esire# ch!r!cteristics !s strength !+r!sion


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resist!nce el!sticity resilience !n# 8e7 resist!nce

ch!r!cteristics%

Polypropylene "!y !lso +e e7tru#e# in sheet for" for

'!rious uses% *he sheets "!y +e ,l+rill!te# or slit to for"

for "ono,l!"ents or +un#les of pro#ucing ,l!"ents is

consi#er!+ly che!per th!n e7trusion through ! spinneret%

*he sheets !re slit into pre#eter"ine# 'ery n!rro(

ri++ons +y scri+ing cutting perfor!ting or other suit!+le

technique%


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.ono,l!"ent Y!rns

*he "ono,l!"ent y!rns !re pro#uce# fro" in#i'i#u!l

!n# the r!nge of #i!"eter is 'ery (i#e 1;0 to 10000

#enier%

.ulti,l!"ent Y!rns

Polypropylene "ulti,l!"ent "!y +e pro#uce# !s str!ight

or +ul-e# y!rn of !+out 3? to ?40 ,l!"ents

r!nging fro" !+out 50 to ?;00 #enier

#te7%>

pun Y!rns


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Polypropylene ,l!"ents "!y +e cut into st!ple for non

(o'en f!+ric%

t!ple "!y +e spun on ! con'ention!l cotton or (ool

syste" (ith ! 'ery slight "o#i,c!tion either into 100percent polypropylene spun y!rn or +len#e# (ith other

,+ers%

NHN) POLYPROPYLENEBR2

.uch (or- re"!ins to +e #one in #e'eloping ,nishing

techniques for f!+rics cont!ining polypropylene ,+er%

Polypropylene is resist!nt to (!ter !n# ! (i#e '!riety ofche"ic!ls% .ech!nic!l ,nishes such !s n!pping (ill

enh!nce the soft te7ture !n# (!r"th of the f!+ric% Other

,nishes such !s e"+ossing !n# he!t setting require

c!ution%


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E@L&*N) POLYPROPYLENE BR2

Polypropylene is the lightest of !ll te7tile ,+ers !n#

therefore pro'i#es "ore ,+er per poun# for gre!ter !re!

co'er!ge%

trength


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*he r!nge of the strength of polypropylene ,+ers is quite

(i#e +ut in gener!l it is co"p!r!+le to th!t of nylon !n#

the polyesters%

*he strength !n# gener!lly goo# !+r!sion resist!nce ofpolypropylene ,+er "!-e it #ur!+le !n# ser'ice!+le for

+oth consu"er !n# n#ustri!l uses%

El!sticityA

Polypropylene ,+ers !re less el!stic th!n nylon ,+ers%O'er ! perio# of ti"e const!nt stress on the y!rn results

in ! cert!in !"ount of per"!nent elong!tion%

Resilience

Polypropylene ,+er h!s goo# resilience% *his property

contri+utes to its suit!+ility for c!rpets !s (ell !s !pp!rel%

t is ! gener!l ch!r!cteristics th!t the gre!ter the


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strength of polypropylene ,+ers the less resilient they

!re%

hrin-!ge

Polypropylene is un!ecte# +y (!ter !n# (ill not shrin-%

Ho(e'er #epen#ing upon the type it #oes +egin toshrin- (hen su+Cecte# to +oiling te"per!ture of 414D

!n# !+o'e%

Re!ction to l!-!lies

Polypropylene h!s e7cellent resist!nce to !l-!lies

nity for /yes

*he gre!test h!n#ic!p of polypropylene ,+er is its #yeing

#iculty%


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Resist!nce to Perspir!tion

Polypropylene is ! rel!ti'ely che"ic!lly inert ,+er% t

therefore (ill not +e #eterior!te# +y perspir!tion%

Documents

Polypropylene Manufacture