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Патент USA US2115940

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May 3,›1938.
`
A_ AÇBURRY _
E
2,115,940
'JECTION OF PLASTICS
Filed Oct. 19, l936
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Patented May 3, 1938
UNITED STATE'S PATENT
OFFICE
&115340
MACHINE FOR INJECTIONOF PLASTICS
Arthur A. Buri-y, Toronto, Ontario, Canada
Application October 19; 1936, Serial No. 106.271
In Canada September 5, 1935
(CI. 18-30)
The principal objects of this invention are'to supply of electric current to the heating ele
ment l.
overcome the di?lculties met with in the mould
Tiere are many standard forms of thei-mo
ing of_ plastic materials, such for instance as cel
lulose compounds and phenol condensation com' static control, which may be utilized for this pur
5 pounds, whereby a uniform ?ow of material from pose and it is not deemcd necessary to either show
or describe any particular form, but it is readily
the injection noz'zle may be obtained, and where
by the heat applied to plasticize the material may understood that the electric heater may heat the
2 Claims.
water surrounding the same to create steam of a
i be e?fectivelybontrclled.
The principal features of the invention consist~
10 in the novel a'rrangement of a heating jacket
surrounding the injection cylinder with means
for maintaining a constant temperature in such
`~jacket, and means for directing the plastic ma
terial at' the discharge end of the cylinder to
415 effectively maintain a uniform plasticity of the
material being extruded from the cylinder.
desired pressure and temperature, and the steam
and the surrounding body of metal will maintain 10
its temperature uniformly, even though the cur
rent supply to the heater may ?uctuate due to
` being cut on and off;
i `
`
The uniformity of heat applied will maintain
the plastic material contained in the cylinder
at a uniform state of plasticity for a substan
In the accompanying drawing, Flgure 1 is a tially uniformdepth, but as the material varies
longitudinal' sectional elevation_ of the heated in its characteristics, it' isfound that the central
portion and discharge end of a plastic moulding part of the material in the cylinder may be less
plastic than that closer to the cylinder. and in 20
20 cylinder.
.Figure 2 is a cross section and. elevation order to ensure uniformity of plasticity of the
material being forced through the discharge ori
'through the line 2--2 of Figure 1.
'Figure 3 is a perspective detail of the ?ow di- ' ?ce 3, I provide a means for diverting the plastic
-` recting means arranged within the cylinder head. material from the centre outwardly to mix in in
`_ ?5 - In the manufacture of articles moulded under timate contact with the more plastic outer mate
_pressur'e- from heated plastics, it has been found rial and to be forced into closer association with
_ difficult
to
maintain
a _ uniform
temperature
... i throughout the body of material contained in the
:.' - , pressure cylinder, principally owing to the fact
i 30 that it requires'from 200 to 300 pounds per square
inch of steam pressure to obtain, a temperature
su?icient to plasticize the moulding compound
and the known forms of heat application create
too much ?uctuation.
i
35 i These dimculties have been overcome in a very
«simple manner in the *device herein shown, in
which the cylinder I, in which the plastic mate
the heated cylinder wall.
This device is in the form of a steel or other
metal member comprising a central boss 9
formed with a plurality of vanes ?u, which are
of a lance-shaped form in longitudinal section
presenting sharp-edges ll extending from the
centre boss to the inner wall of the cylinder.
Any desired number of these dividing vanes may
be used. As the plastic material is forced end
wise by the plunger !2, the harder core in the
center is held by engagement with the boss 9 and,
` as it softens and spreads, it is split by the edges
Il 'of the vanes ?o and directed outwardly to mix
40 3. surrounding the cylinder I is a. cylindrical " with the more plastic material at the outward
jacket 4, which may form a part of or be Secured part of the cylinder, and the uniformly plasti
cized material is directed into contact with the`
to the cylinder, and forming a part with or se
cured to this jacket is a transversely arranged cylinder wall at its tapering end 2. `
' rial is con?ned, is iormed with a tapering -dis
charge end 2, which leads to the discharge ori?ce
cylinder 5, the interior of which communicates
45 with the interior of the jacket 4 through the
opening 6.
_
V
Arranged within the cylinder 5 and extending
The outward edges of the vanes ?o are formed
in a. shorter curve than the teper of the walls
2 on the inner side,_ so that there is a cavity
or space 13 between the outward end of the vanes
longitudinally thereof is a suitable form of elec v and the inner wall '2 surrounding the discharge
tric heater element “I, which supplies heat to a ori?ce 3, and the material divided by the vanes
50 body of water surrounding said element within ` !0 is permitted to ?ow inwardly in a homogeneous 50'
the cylinder 5. The jacket 4 is provided with a plastic mass as it enters the discharge ori?ce.
The result of the directly applied heat and the
supply ori?ce 8, which may be providediwith'a
obstruction
of the less plastic material from
suitable form of relief valve if desired. It is pre
' ferred, however, to arrange within the cylinder? choking the discharge nozzle produces a. very de
55 5 a suitable form of thermostat to _control the sirable and uniform resultant material to be di 55
2
rected into the mou?ds, in which the articles to be
moulded are formed.
What I claim as my invention is:
ture surrounding the cyl?nder to plastlcize the
contents the?'eof.
2. A plast?c injection device compris?ng a oyl
1. A plastic injection device comprising a oyl
inder having a discharge ori?ce, pressure means
inder having va discharge ori?ce. pressure means for ejecting the' cylinder contents, a seaied Jacket
for ejecting the cylinder contents, a sealed jacket spaced from and surrounding said cylinder, a
spaced from and surrounding a portion of _said chambertdepend?ng from said jacket adapted to
~cy1inder, and an immersion electric heating unit contain a body of water and communicating
arranged at the bottom of said jacket below the with the space in said jacket through a restricted
bottom of said cylinder, said jacket containing a '.ópening, and an immersion electric heater ar
body of water surrounding said heater and spaced rangedín said chamber and adapted to be sur 10
from said cylinder whereby the heating unit gen
rounded by said body of water and to generate
I
erates steam and effects the continuous ?ow steam.
around said portion of the cylinder to create
I _ ARTHUR A, BURRY.
15 and maintain a substant?ally uniform tempera
16
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