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Патент USA US2408628

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Oct. 1, 1946.
Filed on. n, 1943
LEE’ 5 E255”
Patented Oct. 1, 1946
3 Claims.
(01. 18-12) ’
This invention relates to the extrusion of non
metallic plastic material, and as one of its ob
jects, aims to provide a novel means by which
In extruding non-metallic plastic material to
form relatively thinv or thin-walled products con‘
siderable pressure must be applied to the mate
such plastic material can be extruded in a more
rial to obtain a satisfactory ?ow through the ex
rapid'and satisfactory manner than previously. 5 truding die or ori?ce. The reason for this is that
Another object of my invention is to provide - for the extrusion of such thin products the die
has a corresponding relatively narrow ori?ce and
the surface area of the product in relation to its
a novel means by which the output of existing
extruding apparatus can be greatly increased at
very little cost.
cross-sectional area is great and results in a rela
My invention further provides a novel extrud 10 tively increased amount of friction or adhesion
between the die and the material being extruded.
ing means for plastic material, involving the use
of relatively rapid vibrations for accelerating the - The heavy pressure required in the cylinderis'
flow of the material through a die or ori?ce.
Still another object of my invention is to pro
vide a novel means involving the use of ?ow
I needed to overcome such friction and adhesion.
a My invention is applicable to various kinds of
15 extruding apparatus and extruded products but
accelerating vibrations and which is especially
is especially valuable in the extrusion of the
above mentioned thin or thin-walled products,
because it greatly facilitates the ?ow of the plas
tic material through the extruding die. In Figs.
' rate for a given pressure applied to the plastic
20 1 and 2 I have accordingly shown the extruded
product la in the form of a relatively thin strip
Other objects and advantages will become ap
of plastic or thermoplastic material and have
parent as the detailed description proceeds.
valuable for extruding thin articles from‘ non
metallic plastic material at a greatly increased
In the accompanying sheetof drawings
shown the die l3 as having an ori?ce or delivery
opening 7 I! of a corresponding shape, that is to
Fig. 1 is an end view of extruding apparatus
embodying my invention.
25 say, in the form of a relatively narrow slot. The '
Fig. 2 is a partial longitudinal sectional view
die l3 also has a converging passage 20 therein,
which forms a relatively smooth continuation of
of such apparatus taken on line 2-2 of Fig. 1.
the reduced end Ha of the cylinder II and con
Fig. 3 is an end view of another form of my
novel extruding apparatus.
nects the latter with the ori?ce I9.
Fig. 4 and 5 are plan views, of a diagrammatic 30 The above mentioned vibratory feature con- ‘
nature, showing comparative results obtained
sists in imparting relatively rapid vibrations to
from extruding apparatus with and without the
use of my vibratory feature.
the extruding apparatus l0 and preferably to
the extruding die l3 thereof which is also some
times referred to as the die head. These vibra
tions can be imparted through the extruding ap
Proceeding with a more detailed description
of my invention reference will now be had to Figs.
1 and 2 in which I show a conventional form of
paratus or die by any appropriate vibratory
extruding apparatus l0 embodying my novel vi
bratory feature. The apparatus Ill comprises a
cylinder l I adapted to contain non-metallic plas
means or device such as the vibratory device 2|
shown in this instance. The vibrator 2| may be
an electric or electro-magnetic vibrator to which
tic or thermoplastic material l2 and a die head 40 operating current may be supplied through the
conductor cord 22. The vibratory device may be
produce a desired product. A plunger I 4 oper
connected with the die It in any suitable man
' 13 for extruding or discharging such material to
able in the cylinder II subjects such material to
pressure forcing the same through the reduced
~ end Ha of the cylinder and through the extrud
ing die 13. The cylinder H is contained in a
ner,_'for example it may be mounted directly on
the die at a suitable point thereof as shown in
This vibratory device may em
body a means by which the rate and amplitude of
45 Figs. 1 and 2.
the vibrations may be adjusted and which adjust
body is which is suitably supported and forms .3,
part of the extruding apparatus. A heating coil.
7 ing means is controlled or actuated, from the ex
‘ terior of the device by the knob 23. I
I 6 is disposed around the cylinder l I and sup
The vibrations imparted to the extruding ap
plies heat to the material‘ l3. Thermal insula 50
paratus are preferably small, relative rapid blows
tion I‘! retards loss of heat from the cylinder.
or jars and result in a relatively great increase
The material ~l2 canbe any non-metallic plas
tic material which is suitable for extrusion pur
in the rate of ?ow of the plastic material from
poses including thermoplastic materials such as
the ori?ce I 9 for a given pressure applied to the
the material known as “tenite."
material in the cylinder II. In producing this
light blows or jars it should be understood that
pressure and temperature values. Fig. 4 shows a
vibrator 35 mounted on the die 38 of the appara
tus and Fig. 5 shows the die 35 without having
my vibratory feature applied thereto. Fig. 4
shows a relatively greater length of extruded
product 31 being produced in a given time inter
val than in Fig. 5. These comparative views il
lustrate the accelerated ?ow of the plastic mate
the invention contemplates a wide variation in
rial which is obtained through the use of the vi— 1
accelerated ?ow the vibrations apparently serve
the purpose of preventing the plastic material
from adhering to the surfaces of the die and also
in decreasing the friction which would otherwise
retard the ?ow of material from the ori?ce.
While I have mentioned the vibrations as being
relatively rapid and as being preferably small or
the rate, amplitude and force of- the vibrations, 10 bratory feature of my invention, although it is
not intended that the lengths of extruded prod
because these factors can obviously be varied to
uct in Figs. 4 and 5 be scaled or otherwise com
suit the requirements of the particular material
pared by measurements of my patent drawing.
being extruded, the characteristics of the die or
From the. foregoing description and the ac
' ori?ce, and the shape or form of the product
15 companying drawing it will now be readily under
being produced.
stood that I have provided a novel means by
which non-metallic plastic or thermoplastic ma
terial can be extruded at a relatively accelerated
rate and involving the use of vibrations imparted
calized in or con?ned to the die or die head. To
this end, the die I3 is connected with the mem 20 to the extruding apparatus for reducing the fric
tion and adhesion in the extruding die or ori?ce.
ber I5 so as to have only a relatively small area
It will also be seen that my novel method and
of contact therewith as represented by the pro
vibratory feature can be applied to extrusion ap
jection 24. Other portions of the die l3 are iso
paratus during the initial construction thereof or
lated from the member 15 by the intervening
space 25.
25 can be applied to existing extrusion apparatus for
greatly increasing the output thereof at relatively
In Fig. 3 I show another form of my novel ex
low cost.
truding apparatus in which my vibratory feature
While I have illustrated and described by ex
is used in conjunction with an extrusion die 21
truding apparatus in considerable detail it will be
having an ori?ce 28 of a shape to produce an ex
truded product in the form of the thin-walled 30 understood, of course, that I do not wish to be
correspondingly limited but regard my invention
tube 29. In this modi?ed form of my extrusion
as including all changes and modi?cations com
apparatus a plurality of vibrators 30 are mounted
ing within the scope of the appended claims.
on the die 21 so as to be located on oppositesides
Having thus described my invention, I claim:
of, or in spaced relation around, the ori?ce 28.
1. In extruding apparatus, a die including a die
The vibrators 30 are, in this instance, represented 35
head having an extrusion opening, means for dis
as being ?uid actuated vibrators to which com
charging heated non-metallic thermoplastic ma
pressed air or other suitable motive ?uid is sup
terial from said extrusion opening; and a vibra- ,
plied by the pipe 3!. The operation of the vibra
tion generating device attached to said die head.
tors 30 may be controlled by the valve 32 located
2. In extruding apparatus, a die including a die
in such pipe. '
head having a relatively narrow ori?ce, means for
It will be understood, of course, that in accord
discharging non-metallic heated thermoplastic
ance with my invention the vibrations are im
parted to the die or extruding apparatus simul
material through said ori?ce by applying a given
taneously with the carrying out of the extrusion
pressure to said material, and means for accel
erating the ?ow produced through said ori?ce
operation, that is, simultaneous with the applica
tion of pressure to the plastic material I! and
by said given pressure comprising a vibrator at
also the application of heat when the material is
tached to said die head.
3. In extruding apparatus, means for heating
a thermoplastic material. Likewise it will be un
derstood that a plurality of vibrators could be
non-metallic thermoplastic material, means for
applied to the die I3 as is suggested in Fig. 3 and,
subjecting the heated material to pressure, a die
head having an extrusion opening for the delivery
on the other hand, a single vibrator could be used
with the die 2'! of Fig. 3 as in the arrangement of
of said material therefrom in response to said
As shown in Fig. 2 the vibrations are prefer
ably applied to the extruding die l3 in a manner
such that the vibrations will be more or less 10
Fig. 1.
' ‘pressure, said die’head being connected with the
In Figs. 4 and 5, I have represented diagram
matically and in a visual manner the compara
tive results obtained from conventional extrud
ing apparatus 34 when used‘ with and without my,
vibratory feature. These views represent the
same extruding apparatus using the same extrud
ing die, thermoplastic material, and the same 60
apparatus so that the major portion of said head
is isolated from direct contact with said heating
and pressure means, and a vibrating means at
tached to said die head and operable to impart
vibrations to the latter for accelerating the flow
of material through said extrusion opening.
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