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Патент USA US2411398

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Nov. 19, 1946.
D_ A, WALLACE
2,411,398
PLASTIC MOLDING
Filed Aug. 5, 1942
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ATTORNEYS.
Patented Nov. 19, 1946
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2,411,398
UNITED STATES PATENT OFFICE
2,411,398
PLASTIC MOLDING
David A. Wallace, Detroit, Mich, assignor to
Chrysler Corporation, Highland Park, Mich., a
corporation of Delaware
Application August 5, 1942, Serial No. 453,619
2 Claims.
(or. 1s~30)
1
This invention relates to ‘an improved plastic
moldingapp'aratus and method.
More speci?cally the invention pertains to an
improved apparatus and method of this ‘kind
which is particularly adapted to mold and sub~ $1
stantially integrally unite either thermosetting or W
thermoplastic materials to a previously set or
'
2
.
between the cavities of the die sections ‘l B and l I_.
In the illustration shown, this part comprises a
solidi?ed or cured plastic tube M in portions of
which it is desired to form a partition I5 and a
reinforcing lining l6. Mandrels Hand 118 are in
serted into the upper and lower ends respectively
of the tube either ‘before or after the latter is dis
posed in the die. The adjacent extremities of the
mandrels I‘! and 18 are suitably spaced apart to
thermosetting or thermoplastic material.
One of the main objects of the invention is the 10 predetermine the thickness of the partition [5 and
portions of the side walls of the mandrels may,
provision of an apparatus and method of this
cured molded or extruded article comprising either
character by which plastic articles can be con
veniently produced by a multiplicity of successive
molding or extruding operations between which
the previously molded plastic is cured or set.
Another object of the invention is the provision
of an apparatus and method of this kind by which
parts of a plastic structure previously molded or
extruded in lengths exceeding that in which they
if desired, be cut away, as illustrated at l9 in Fig.
1, to provide for thickening of the wall of the mm
M at a selected location such as adjacent the par
tition I4.
In the form shown in Fig. 1 the upper mandrel
i‘? has a head part 20 which is receivable in a re
cess
of the
2! mandre1
formed in
is of
thesmaller
die sections.
cross section
The body
thanpart
the »
are employed, can be cured or set, out to size and 20 interior of the tube l4 and is so centrally located
therein as to provide an annular space between it
completed by a subsequent molding or extruding
and the tube M for accommodating the flow of
plastic material from an inlet ori?ce 22 to the
A further object of ‘the invention is the pro
space between the adjacent ends of the mandrels
vision of an apparatus and method of this kind
by which internal plastic ‘structure can be molded 25 as well as into the spaces thereabout.
Molten, flowable plastic composition may be
within ‘and substantially integrally united with a
forced through the inlet ori?ce 2-2 by any suitable
previously molded or extruded completely cured
plastic injecting apparatus which, for the pur
hollow article.
pose of illustration is shown to include a chamber
An illustrative embodiment of the invention is
23 having an outlet passage 24 provided with a
shown in the accompanying drawing, in which:
Valve 25 and a discharge nozzle 26 adapted to de
Fig. 1 is a fragmentary vertical sectional view of
liver molten plastic to the inlet 22. The chamber
plastic molding apparatus embodying the inven-1
23 may be heated in any desired manner, such as
tion and illustrating the ‘improved plastic forming
by
steam or other heating medium circulation
method.
Fig. 2 is a transverse section taken on line A-A 35 through passages 2'! formed in its wall structure.
The die sections of the mold, as well as the man
of Fig. 1.
drels thereof are preferably provided with pas
Fig. 3 is a fragmentary elevational View partly
sages 28 and 29, respectively, through which may
in section of pro-cured or set plastic member pre
be circulated either cooling or heating medium
pared for the reception of a subsequent molding
‘operation.
operation and illustrating a further development 40 depending upon the treatment required to solidify
the particular type of plastic being molded. When
of the invention.
a thermosetting plastic composition is employed,
Fig. 4 is a longitudinal sectional view illustrat
a heating medium is passed through the passages
ing a molding operation embodying another form
28 and 29 or electric heating elements (not shown)
of the invention.
The improved plastic molding apparatus shown 45 may be disposed therein. When thermoplastic
material is used, a cooling medium is supplied to
in the drawing, which also illustrates the im
these passages in order to chill the molten compo
proved plastic molding process, comprises a pair of
sition after injection thereof into the mold to
complementary die sections [0 and II which may
convert it to asolid state.
be indexed by pins I2 into proper relationship and
clamped together between vice-like jaws (not 50 Curing or solidi?cation of the plastic is con
ducted while the injected composition is ?rmly
shown) .in accordance with conventional plastic
held under pressure in intimate contact with the
molding practice. The part comprising solidi?ed
pre-solidi?ed or pro-cured plastic part of the
plastic material of either the thermosetting or
composite structure. By following this procedure,
thermoplastic type, to which another plastic body
is to be substantially integrally bonded is placed 65 the subsequently molded or injected plastic is
2,411,398
4
substantially integrally united with the pre
viously solidi?ed composition to the end that
tube sections registering therewith. When molten
and bond thermosetting plastic compositions and
thermoplastic compositions to parts comprising
terial used, the injected plastic substantially in
tegrally unites with the pre-solidi?ed plastic of
plastic material is injected in the manner illus
substantially no de?nite line of demarcation is
trated in Fig. 1 into the recess 35 and subsequently
apparent between the plastic materials solidi?ed
solidi?ed while under compression by curing or
at di?erent times. While it is preferable to mold 5 cooling, depending upon the type of plastic ma
respectively like pre-solidi?ed or cured mate
rials, molten thermosetting compositions may 'be
molded and bonded to pre-solidi?ed thermoplas
tic material and molten thermoplastic compounds
may be molded and bonded to pre-cured thermo
setting compounds.
the portions of both tubev sections 3|, thereby rig
idly joining them in both liquid and gas tight re
lation.
A large number of plastic compounds may be.
molded in accordance with the invention, ex
amples of several of the thermosetting and ther
The composite tubular structure formed in ac
moplastic types being respectively phenol formal
cordance with the disclosure in Figs. 1 and 2 may 15 dehyde, urea formaldehyde, phenol furfural and
be severed along the line 2-—2 of Fig. 1 to provide
cellulose acetate, cellulose acetate, butyrale,.
a pair of containers, each having/one closed ex
polystyrene.
tremity, such as are useful in many arts includ
I Although but several speci?c embodiments of
ing incendiary bombs.
the invention are herein shown and described, it
The lining l6 shown at the upper end portion 20 will be understood that various changes in the
of the structure illustrated in Fig. 1, may be
sequence of operations, steps and materials em
omitted by bringing the body portion of the man
ployed may be made without departing from the
drel I‘! to close ?tting relationship with respect
spirit of the invention.
to the interior of the tube I4 and supplying the
I claim:
molten plastic material to- the space between the 25
1. The method of manufacturing plastic con
upper and lower mandrels l1 and I8 through a
.‘tainers having atubular body and a closed end
passage 30 formed in the mandrel H, ‘as illus
which comprisesrforming a cured tubular part
trated in Fig. 3. vSpaced series of holes 3| may
from plastic material corresponding. in length to
be provided in the portion of the tube surround
the combined lengths of a pair of said containers,
ing the space between the mandrel to accommo 30 embracing said tubular part between die mem
date the ?ow of the plastic material into direct
bers having complementary cavities for receiving
mechanical interlocked engagement with the
tube M.
it, inserting a die into each opposite end of said
tubular part to de?ne a space therein between
The improved plastic molding and bonding ap
adjacent ends of said dies, injecting molten plas
paratus and process may be employed to bond 35 tic into said space and into ?rm engagement with
together and substantially integrally unite two
the wall portions of said ‘tube surrounding said
or more pre-solidi?ed plastic parts such as see
space, solidifying said plastic material under
" tions of tubing, as illustrated in Fig. 4. In this
pressure while in contact with said wall portions,
'form of the invention, two tube sections 3| are
and severing said tube intermediate the thickness
mounted in end to end adjacency on a mandrel 40 of said last injected plastic to produce a pair of
32' having a portion adapted to closely ?t the in
containers each having a closed end.
terior of the adjacent end parts of the tube sec
2. Apparatus for forming a plastic structure in
tions. The tube sections thus mounted on the
the interior of a pre-formed and set plastic tube
mandrel are then placed in a mold comprising
comprising main die members having comple
complementary mold parts one of which is shown 45 nientary cavities for receiving said tube, retract
at 33 and in which is provided a central cavity
able die members insertable in opposite end por
having end portions 34 adapted to closely ?t the
tions of said tube and adapted to form a chamber
exteriors of the tube sections 3| and having an
between their adjacent ends and the wall portion
intermediate annular recess 35 extending around
of said tube, one of said retractable die members
and registering with the adjacent end portions
having a molten plastic inlet opening communi
cating with said chamber, and means for inject
ing molten plastic material under pressure into
said chamber including a discharge nozzle regis
terable with said inlet.
55
DAVID A. WALLACE.
of the tube sections. An inlet passage 36 is
formed in the mold preferably at the parting line
of the parts 33 thereof for admitting molten
plastic material to the space between the walls
of the recess 35 and the external surfaces of the
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