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Патент USA US2405039

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July 309 §94@
R. s. JESIUNom/sm
2,405,039
DIE UNIT FOR EXTRUDING SHAPES OF ORGANIC PLASTIC MATERIALS
Filed Feb. 26, 1944
„Eliza :wie eggs
Patented July 3o, 194s
2,405,039
UNITED STATES PATENT oFEicE
2,405,039
DIE UNIT FOR EXTRUDING SHAPES OF
ORGANIC PLASTIC MATERIALS
Raymond S. Jesionowski, Hartford, Conn., assign
or to Plax Corporation, Hartford, Conn.. a cor
poration oi Delaware
Application February 26, 1944, Serial No. 524,116
3 Claim. (Cl. 18-12)
1
Z
This invention relates to the forming ot shapes
by extrusion of organic plastic materials through
ceives hot plastic material therefrom, as explained
a die and has particular relation to the extru
sion of shapes to be drawn into fiber.
'
The drawing rolls I6, il, I8 and i9 may re
spectively be mounted on shafts 2 l, 22, 23 and 24,
hereinafter.
.
Fiber of organic plastic material has many 5 driven by Sprockets 253 25, 2l and 2.8 by means
uses which usually require that the über is smooth
0f a Cham 29 Whlch, in turn, is driven by one
and of uniform gauge For exemple, über of
of the two sprockets 3l and 32. _The chain 29
polystyrene is useful as electrical insulation.
1S dl‘lf’en at Such Speed and th? S1295 0f the Ye'
But unexpected dimeulty has been experienced
spectivesockets are so proportioned as to cause
in attempting to extrude certain plastic mate-J l0 the Pulling Tous 5_0 rotalte'at the deslredêpeêds
Hals which may be drawn into über Such as poly.,
to draw _the plastic material and reduce its size
styrene. This dimculty arises when Such mate“
to the‘size desired. It will be understood that
rials are heated and extruded through a die in
îrïlläâkl’lêîable means may be employed for drawing
the customary way to form-Smau shapes suçh 1.- Tlie die unit 35 comprises a barrel 36 heat
asrodswliichmaybedrawnintofiber. Thedif-f
it
ilculty
issuesisfrom
that the
the die
material
and assumes
wigglesa violently
crinkled or
as
.
.
.
-
J. kted £31 Th I " 3 l
àaëuîhíngass t'he jmîeîìîâlagsolfs
.
.
.
.n'
_
.
i
th
‘
smooth
strglght shape .of umform
«n thlcknesë”a 20 42 ‘through which pass
.bolts one of which is indi
When the crinkled shape is drawn, a über of velg,7
.
.
»
.
.
cated at 43, screwed into the outer end of the bar
llneven tmçkness or .gauge 1s formed’ the vana“
rel 36 and serving to hold the bushing die plate
@ons .m thickness bemg very pronounced' such
and retainer ring in assembled relation yas shown.
“resarcir essere
no e1- di
a
t fl; xtrudin
Y, . e ~
o ‘Í ls
u,
The m
m’ìu sha?
ghs
f pesìo
013m@ plast” Huitema 'by _t e use o Wn‘cn
wiggling of extruding -shapes 1s _prevented and a
í’mooth shape 0f uniform thmkness may be
ormed-
„
e of
aß
25 turned to conical shape, as indicated at 44, so as
‘
„
to direct the plastic material 45 from the screw
stutter (not shown) into the central passage 4E
which runs through ¿he bushing. This passage
4G preferably is or” substantial diameter approxi
3e mately as shown.
ther obiects and advantages of the invention
on its Outer face; the bushing 3g carries a C0ni_
will be pointed out in_or will be apparent fr_flm
the @umfang Specification and the accompanying
cally shaped projection 4l which is received by,
‘out slightly spaced from a conically shaped hole
“mY/mg 1.11 Wmchì
48 „formed on the inner side of the die plate 4l,
h
_
~ ~
_
i
F13' `1 1S Él' Pama‘l View m 51de eìevatïo@ ÜÍ im 35 thus providing a restricted unobstructed passage
eyxtrusmn d1@ uml' emnodymg me Present mven“
49 of conical shape and annular cross section be
tlßn and 0f drawmg apparatus for me producties
tween the bushing sa and the die niet@ 4i. This
0f ñpf‘î; .
passage 4S is extended at its base through a trans
’
_
.
_.
I
Flg‘ ‘a _1S an enlarged 'we_w 1n Yertlçal lonìgëwdl”
nal Sectlon 0f the @Xbruslon d1@ un“ of El@
and.
i
1
l
Verse annular passage
l
"
thedie plate 4i through the passage 5i tangent
F1g- 3 1S a' VïeWÈn tfans‘f'çrs? s601710? taken 05;»
to the outer edge äêa oiT said passage, as shown
the line 3-«3 of Fig. 2 looking in the direction ol;
¿n Fig 3_
the arrows.
may be provided,
_
'
e
into a number of longi
4e tuclinal passages 52 drilled from the inner side of
_
a
¿my desinee number of passages 52
ten of such passages being
In Phe apparatus 11h15“ ated. m me dïfa'wmê 45 shown equally spaced in a circle concentric to the
there is shown at 35 an extrusion die unit emn
am of tne die plate M_ The Outer ends of the
bodylng the _invention and which forms a P915
of the extrusion apparatus. The rest of such ape
paratus (which is not shown) comprises a screw
passages 52 may converge to .form smaller ori»
nees el», 53, which orifices preferably, have rele
tively thin lips as shown.,
driven by_suiíiable melius. and Operating in 8 50 The outer edge of the ring 42 may be spirally
heated cylinder into which organic plastic maten
grooved as shown at 55 to receive an electrical
rial is fed so that it can be heated, compressed
and worked into a substantially uniform mass of
the desired working viscosity. The die unit 35
resistance 56, which may be wound in the grooves
for the purpose of heating the ring 42, plate 4i,
and bushing 38, which also will be heated by 'the
is suitably connected to the screw stuifer and re- 55 barrel 36 from jacket 3l.
~
2,405,039
4
3
of fiber it is preferred to use a relatively small
orifice 53 in order to reduce the amount of draw
ing necessary to form ñber of small diameter.
Various changes may be made in the details
of construction and mode of operation of the il
The plastic material is so acted upon in the `
die unit 35 that wiggling of the extruding mate
rial .is eliminated and smooth shapes or rods are
extruded, such as shown at 58. When such ex
truded shapes are drawn as by means of the
lustrated embodiment without departing from the
scope of the appended claims.
drawing rolls I6, I1, I8 and I9, Fig. 1, a smooth
ñber 59 of uniform thickness and free of bumps
Having thus described my invention what I
desire to claim and secure by Letters Patent is:
or unevenness is obtained.
The passage 49 preferably is very narrow or
l. A die unit for the extrusion of small shapes
of organic plastic material without crinkling or
spiraling comprising a barrel, a bushing associated
with the discharge end of said barrel, a die plate
associated with said bushing and having formed
therein a plurality of longitudinal passages ter
minating in extrusion'orifices, means for holding
said barrel, bushing and die plate in assembled
relation, said bushing having a central passage
therethrough, spaced complementary surfaces on
said bushing and in said die plate respectively
restricted, its thickness preferably being of the
order of slr of an inch. Also it is preferred to
make the passage 52 of substantially greater di
ameter than the width of passage 49. For best
results passage 52 should be greater than 1A; inch
and preferably about 1A; inch in diameter.
In the use of the novel die unit 35, the plastic
material, after being heated and worked in the
screw stuffer (not shown) is further heated in
the die unit as it passes into it, as it iiows through
the passage 46 (which effects a substantial re
duction in the thickness of the plastic material),
which surfaces are constructed and arranged to
form an internal, elongated and restricted pas-`
sage of annular cross section for conducting said
plastic material from said central passage to the
the substantially larger passages 52 and through
25 longitudinal passages in said die plate, and means
the orifices 53.
for heating said die plate.
Such heating, which may be very intense and
2. A die unit for the extrusion of small shapes
effective, in conjunction with the diameters or
of organic plastic material without crinkling or
thicknesses of the several passages or their rela
spiraling comprising a barrel, a bushing associat
tive proportions, particularly in conjunction with
the relative narrovmess of passages 49 and 5i, 30 ed with the discharge end of said barrel, a die
as it flows in very thin section through the nar
row passages 49 and 59, and as it ñows through
plate associated with said bushing and having
through which the plastic passages in thin cross
formed therein a plurality of longitudinal passages
section, insures that the plastic material can be
terminating in extrusion orifices, means for hold
very uniformly heated to a condition of low vis
- ing said barrel, bushing and die plate in assem
cosity by the time it reaches orifices 53. This
may serve to permit relaxation of orientation or 35 bled relation, said bushing having a central pas
“elastic memory” particularly of materials which
sage therethrough, spaced complementary sur
are “rubbery” when heated to extrusion tempera
faces, comprising conical surfaces, on said bush
ing and in said die plate so constructed and ar
tures.
rI'he narrowness of the passages 49 and 5I also
ranged as to form an internal, elongated and re
provides a substantial drop in pressure between
the passages 45 and the passages 52, so that the
pressure in passage 52 is relatively low. This rel
atively low pressure condition in passage 52 may
provide the opportunity for relaxation of orienta 45
tion in the plastic material passing through the
passages 52 under the effect of the heat trans
mitted to the material therein through the ring
42 and the walls of said passages. Thispressure
drop may also tend to prevent spurting or turbu
lent flow as the material issues from oriiices 53.
The relatively large diameter of the passages
52 may result in a slower rate of flow of the plas
stricted passage of annular cross-section for con- ~
ducting said plastic material from said central
passage to said longitudinal passages, and means
for heating said die plate.
3. A die unit for the extrusion of small shapes
of organic plastic material without crinkling or
spiraling comprising a barrel, a bushing associat
ed with the discharge end of said barrel, a die
plate associated with said bushing and having
50 formed therein a plurality of longitudinall pas
sages of substantial length terminating in ex
trusion orifices, means for holding said barrel,
bushing and die plate in assembled relation, said
bushing having a central passage therethrough,
tic material through said passages than would
spaced complementary surfacesconstructed and
occur with passages of substantially smaller di
arranged to form an elongated restricted passage
ametenfor example 1A; of an inch or less, thisof annular cross section for conducting-said plas
aiîording suiiicient time for heating and relaxa
tic material from said central passage to said
tion of orientation or “elastic memory.” The rel
longitudinal passages, said restricted passage hav
atively large size of passages 52 may also tend to
prevent spurting or turbulent now through ori 60 ing a Width substantially less than that of said
longitudinal passages, the -width of said restricted
iice 55.
passage being of the order of approximately one
The conically shaped passage 49 and the annu
thirty-second of an inch and the width of said
lar passage 5i are unobstructed and permit even
longitudinal passages being of the order of ap
flow and distribution of the plastic material to
the passages_52, thus insuring that the plastic 65 proximately one-quarter of an inch, and means
for heating said die plate to heat the plastic ma
material will extrude at a uniform rate from all
terial in said destricted passage and in said longi
of the oriñces 53.
tudinal passages.
It will be understood that the orifices 53 may
be of any size desired, that is, may be larger or
RAYMOND S. JESIONOWSKI.
smaller than shown in Fig. 2. In the production
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