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Патент USA US3075259

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Jan. 211963
J. RISUCHER
_ 3,075,249
PROCESS FOR COMPRESSION MOLDING EMBOSSED ARTICLES
'
Filed Sept. 6, 1960
INVENTOR
Jbsgoh 1L Sacha r
4f?“ ATTORNEY
ilnitc stares Eatcnt
ice
1
threats
Patented .Fan. 29, 1953
2
3,075,249
Of the synthetic condensation products which may be em
ployed, l enumerate:
The aminoplasts, such as urea formaldehyde resins,
PRGQESS FGR COME’EESSION MOLDEJG
EMBOSSED AR'HELES
Joseph R. Sucker, Woodmere, N.Y., assignor to Emsig
Manufacturing $30., New York, N.Y., a partnership
melamine formaldehyde resins, aniline formaldehyde
resin;
Filed Eept. 6, 196%, der. No. 54,093
5 Claims. (Cl. 18-55)
The phenoplasts, such as phenol formaldehyde resinous
condensation products;
Polye'sters, including alkyd resins and unsaturated poly
This invention relates to a method for making a com
pression molded product, and more particularly to but
ester thermosetting resins.
tons, and still more particularly to molded thermoset 10
Such products are initially prepared in the ‘form of
products carrying a surface embossed design.
powder or of pellets or pills of molding powder of such
This application is a continuation-in-part of my ap
resinous products, compressed into simple shapes, after
plication Serial No. 809,994, ?led April 30, 1959, now
blending, where desired, with ?llers and dyes in a known
abandoned, entitled Compression Molded Embossed But
manner and capable of being molded under, heat and
tons or Other Molded Obiects.
15 pressure from the potentially reactive stage to the ther
mally infusible stage.
Known to me is the manufacture of ornamental molded
articles wherein thermosetting plastics are shaped under
heat and pressure. Commercial operation for the produc
By my invention, as an object thereof, it is intended to
impress upon the ?nished surfaces of articles, such as
tion of such products entails costly molding apparatus,
buttons, embossed outlines representing a great many
molds or dies, the investment for which is substantial, 20 open particulated designs, such as fabric weaves, especial
particularly for the simultaneous molding of a large num
-ly where the articles, such as buttons, are to be matched
ber of small ornamental objects, such as buttons, where
in surface design to some garment made of similar fabric.
multiple cavity dies are employed. The alteration of such
An exempli?ed form of such weave is shown in the
dies further to supply a variety of surface ornamentati-ons
appended drawings wherein——
of intricately embossed outline has resulted in shapes of 25
FIGURE 1 illustrates an open weave fabric, the design
limited outline, as it is economical only for long runs to
of which is to be duplicated;
make the change, not to speak of the additional cost of
FIGURE la is a perspective View of a compression
making an intricate design in preparing such dies.
molded pellet forming the starting material in accordance
Styling of plastic articles, particularly buttons, especial
with my invention;
ly with durable thermosetting plastics, has therefore been
FIGURE lb illustrates an open weave fabric treated
for shadow toning;
limited by reason of the unusual expense in the cost of
dies, particularly of dies in which embossed or engraved
‘FIGURES 2 to 6 are fragmentary sectional views to il_
impressions are to be effected.
lustrate molding steps;
'
I have discovered a method for compression molding
FIGURE 7 is a perspective view of an article made in
of plastic products, particularly molded buttons, in ‘a 35 accordance with the molding operation;
multiple cavity die wherein smooth surface molds may
FIGURE 8 is a section taken on the line §——8 of HG
be utilized for molding products with an impressed design
URE 7;
whereby highly ornamental surface impressions of em
FIGURE 8a is ‘a magni?ed fragmentary section corre—
bossed effect, including toning of the shadows by colors,
\sponding to the portion encircled in FIGURE 8, made in
may be supplied economically, particularly on short run 4:0 accordance with another embodiment of my invention.
molding operations, thereby avoiding the great expense
In accordance with my invention, thermosetting syn
of engraved or impressed die sinking.
Still more particularly, it is an object of this invention
to provide a mold for molding thermosetting plastics and
to impart carved, impressed, embossed, engraved surface
effects of durable and intricate nature, particularly with
thetic resinous condensation products which may be cured
under heat and pressure to the infusi-ble stage are em—
ployed and the invention is illustrated in connection with
45
the making of buttons employing multicavity molds of
the order of those which may make from' 13 to 50 ligne
buttons, in number of from about two to three gross in one
multiple cavity dies of smooth outline, whereby short
run molding operations normally requiring costly and in
molding operation. Sew-through ‘buttons or particularly
tricate dies may be effected as economically as the over
shank buttons are contemplated in which :a self-shank or
all long run molding operations.
50 integral shank is molded in one operation. The mold
My invention is predicated upon my discovery that
cavities as contemplated by me for a multiple cavity mold
thermosetting plastic compositions may be impressed, em
are of the general character exempli?ed in my Patent No.‘
bossed and shadow toned with a strippable embossing
2,652,597, September 22, 1953, in which the mold cavity
element and ‘cured to the irreversible plastic form in
dies outline a shank button of the general outline illus~
molds having smooth faced die cavities, provided initial 55 trated in the patent to Troll No. 2,597,912 of May 27,
intermediate curing has progressed to the fully formed
1952.
polymerization stage and the charge has flowed to the
The multiple cavity compression molds for carrying
full capacity of the mold cavities.
out the molding operations are semi-hydraulically actu
Accordingly, by my invention, ‘a method of decorating
ated, with a capacity of about 3000 pounds per square
the surface of plastic products may be practiced, using 60 inch, with heating facilities in excess of 500° F. A press
smooth surfaced molds and a strippable component of
known as the Standard Mystic Press may be employed,
low cost to make impressions and alternatively to shadow
provided with knock out pins for discharge of the molded
tone the same on short runs and thereupon curing the
material in each cavity.
charge of thermosetting materials to the irreversible con
Molding operations with presses having multiple cavities
dition of plasticity, whereby durability is effected in a 65 for making buttons as described, in quantities from two
manner heretofore deemed possible only with costly com
pression molded dies of smooth outline.
to three gross per operation, ‘are very expensive and un
economical unless large runs are staged. In the interests
In accordance with my invention, compression molding
of economy, ‘by reason of the number of cavities in the
charges of resinous products of synthetic condensation
mold, die sinking of the mold cavities is more usually
products which have thermosetting properties are pro 70 devoted to smooth faced outlines and, therefore, em
vided in the form of mold charges, such as pills or pellets.
bossed, carved and etched designs are usually not effected
3,075,249
4
of the button with an ornamental surface outline, for
in multi-cavity molds as described, unless long runs to
example such as the‘ lace‘ shown in FIGURE 1', I may
j’u'stify the cost are assured, to set oi the production
cover the total exposed area, including the ?ash line, of
‘against the cost of the dies.
the lower mold cavity as it is opened at the intermediate
7 According to my invention, I may utilize multiple cavity
stage, as shown in FIGURE 3‘. The‘ material 19, of par
molds having smooth faced or simple shaped outlines
ticulated outline, as effected by the strands 20, 21 to fur
to make compression molded articles‘ from thermose'tting
nish- open work 272, is‘ the design‘ selected for the‘ buttons.
molding powder charges, and to effect an embossed or
A section of the lace fabric 19 is chosen which is of a
intricate surface impression design thereon, and secure
size to permit ready transverse distribution over the
fully cured, thermoset products without the expense of
engraving the mold cavities. Suchoperation may be ef 10 entire exposed section of the mold cavity 12 so that it
will lie across the entire surface of the flash line 17 and
fected for relatively short runs with economy by curing
cover each of the cavities, as exempli?ed in FIGURE 3.
the thermosetting molding powder charge to a stage be
This will add the thickness of the lace to the mold cavity.
low full cure, but to the point where spilling no longer’
Thereupon the mold sections are again closed promptly‘
can occur as ‘a result of continued heat and pressure opera~
tion in the mold. While retaining the heat of such initial 15 and, while retaining the temperatures for curing above
described, the mold portions are held together to‘ bring
curing, and retaining the ability to be deformed at high
the pressure back to the curing pressure of 3000' pounds
pressures, the surface of the charge is impressed with the
per square inch for a period‘ of time suf?cient to com-'
particul'ated design of a strippable material to achieve an
plete the forty second cure.‘ The mold sections are then
embossed or impressed design, the curing being then car
partially opened without effecting kick out‘ by the‘ knock
ried out to the ?nal, irreversible stage as to plasticity, and
out pins 13a, as shown by FIGURE 5, and the fabric
while the molded charge retains the residual heat, Without
19 is stripped while the residual heat of molding is still
deforming the impression so‘ applied, the strippable mate
present in the buttons.
rial is removed and the batch discharged from the cavi
The pressure described has re
sulted in a faithful reproduction of the outline‘ of the
an exampleof making a low cost compression mold‘ 25 intricate lace, under the added pressure contributed by
thelace thickness, on the‘ face of the charge.
ed, surface-impressed-design button from a smooth sur
The buttons may then be blown out of the cavities by
faced, rriultiple'cavity mold which may outline thebutton
compressed air in the well known manner practiced for
shape, I refer to the drawingswherein FIGURE 1a shows
discharging‘ the charge, but preferably the mold sect-ions
the initial charge, which consists of a pill or pellet made
11 and‘ 12. may be opened‘ wide, to‘kick out‘ the buttons‘
from molding powder; The molding" powder'which may
by means of the knock out pins.
be exempli?ed is a ,thermosetting batch‘ of melamine
Alternatively, the‘ mold sections, after stripping'of the‘
formaldehyde resin duly mixed with ?ller and coloring
fabric but before final cure has been completely effected,‘
dyes of known composition, and which may be cured to
maybe closed again and the smooth faced mold section
the infusible, irreversible stage at a temperature from
ties’.
3:10 to 350" F.,at about 300i) pounds per square inch; in
about“) seconds.
35
11 brought to the closing position of the mold; where-g
The pellet 10 is charged into'the one cavity of a multiple
cavity" mold which has been illustrated, and. consists of
an upper cavity section 11_and a registering lower cavity
upon the heat and pressure for‘ ?nal cure .are applied
for a period of time to bring the total curing time to
forty seconds. The impression made in the operation
shown in FIGURES 3' and 4 is not obliterated when the
of‘a form to outline a shank button with a'body portion
?nal curing conditions.
section 12. The mold cavity section 12 has a cavity 13 40 mold sections have been closed and the charge brought to
14 and an, integral shank 15,. the surface 16 whereof is
‘adjacent the flash or parting line 17. The exposed deco7
rative face of the shank button is outlined by the smooth
faced cavity 18 of the vupper mold section 11 of simple 45
7 I prefer to omit. the second molding- step, i.e. closing
contour, and the shank or back of the button forming
the mold sections again after stripping of the fabric, as
previously described. In such event, the mold sections 11'
and 12, after completion of the intermediate curing step,
are moved to the partially opened position to position the
cavity 13 in each case.
particulated material or open work fabric 19 as before and
I _V
the mold sections closed again to effect the embossing and
In a multiple catvity mold of the character described, an
full cure, as previously described, with the fabric in posi
initial charge of two to- three gross of pellets is distributed
into a corresponding number of cavities, whereupon the 50 tion; The mold sections arethen moved to the partially
open position and while the charge is still hot and re
mold is closed while being‘,v heated to a temperature from
tains the heat of molding, the fabric 19 is stripped from
31010’ 350? F., at ‘which’ temperature and under a pres
sure of 3000 pounds per square inch,rthe resinous mate
rial achieves a plasticity to’ follow the outline of the
matehi'ng cavities. Under continued temperature and
pressure for a‘total time of approximately 40v seconds,
the button faces. The mold sections are then moved to
the fully open position shown in FIGURE 6, to effect the
55 pick out of the button charges, and the charged buttons
are then removed by scraping, blowing or otherwise, as
depending upon the size of the button cavities, full cur~
known in this art.
,
For inverted positions of mold sections, i.e. with the
ing may be achieved to secure’ a'thermoset, highly durable, ,
laundering resistant button which no longer responds to
deep cavities in the upper section, after stripping the
deformation at temperatures up to carbonization of the 60 fabric 19‘, a carrier tray may be placed in position be
neath the upper mold section and the mold sections are
‘charge.v
_
then moved to the fully opened position, where the knock
I have] discovered, however, that at an intermediate
stage at which the mold can be opened without tearing
the charge and no spilling occurs at the ?ash line, and
the, button has ‘been initially’ cured beyond the plastic 65
‘stage, and’ when none sticks to one meeting cavity so
that the mold may be opened while retaining the initially
irn'olded charge in the, lower cavity section 12, and the
highly glared apeparance resulting from having under
gone fusion’ is evident, the charge is still capable of being
deformed by an impressing material which, when added
to the same mold cavity of the ?rst molding operation, is
out pins become effective on the upper mold cavities.
Another working example of my invention, although
not aspreferred, I may, particularly with very heavy open
mesh fabric, ?rst cure the charge fora time to e?ect full
or almost full cure, short by 5 to 25 seconds, depending
on the size of the charge, without the fabric in position,
and move themold sections ‘to a partially open position.
At this latter position, the fabric is placed in position
over the button faces, the mold sections closed again to
full heat and pressure‘ for ?ve to twenty ?ve seconds, to
inot'di'splace‘d by stiffness of the charge at this intermedi
eifectthe embossing impression as before. The mold
sections are then moved to‘the partially open position, the
are stage.
Where it is desired to emboss and ornament the face 75 fabric stripped while there is present the residual heat
3,075,249
5
6
of molding but no evidence of tearing. Thereupon the
the charge, to effect a total cure, it being necessary to
observe that the initial cure is carried out to the point
where no further spilling into the ?ash line progresses
while the charge retains suf?cient of the temperature to
mold sections 11 and 12 are moved to the knock out posi~
tion to discharge the buttons, as before, the buttons being
collected by blowing, scraping or by tray catching if in
the inverted position from that shown, i.e. with the deep
evidence resiliency, has gone beyond the plastic stage,
cavity on the upper mold section.
and has been fully formed and is integrated so that none
By this procedure a relatively small run of ornamental
buttons may be made in accordance with the number
of the material sticks to the separating mold section
upon opening of the mold.
While I have described and illustrated simple impres
of cavities by each charge of the mold, employing a simple
cavity outline and without investment in a costly engraved
surface.
The ornamenting material which may be indicated as
sions of the particulated materials during a partial or in
termediate stage, I may impart a two tone or shading
element to the embossed portions of the buttons. This
providing an operative example is lace made of nylon, the
may be accomplished to interfuse simultaneously by
threads of which are mono?laments of from .002 to .050"
in diameter. Such lace may be used for eight or nine
runs without destruction. A variation in diameter of the
threads as described may be proportional to a variation
in button size of from 13 ligne to 50 ligne. A 20 to 50%
open work is recommended.
bleeding a resin lacquer from a carrier which, in this
case, is the particulated material. For this purpose,
particulated material such as the open work lace 19 as in
FIGURE 1 is coated with a pigmented lacquer to provide
the lace 19a (FIGURE lb) with a distribution of lacquer
on the strands 20a and 21a thereof. The lacquer is ap
The mono?lament which I have exempli?ed is prefer 20 plied by dipping, spraying or brushing the ?laments,
lengths or particles of the particulated material.
ably formed from nylon, a material which I have found
is not thermoplastic. Lacework of ?bres which are ther
moplastic, such as cellulose acetate ?lament or yarn, at
An example of a procedure to produce a two tone
effect is as follows:
the temperatures of curing, should be avoided. A wide
10 parts by volume of a heat curable lacquer base, for
variety of materials which are not thermoplastic at the 25 example, epoxy resin, are mixed with
10 parts by volume of a catalyst dissolved in a solvent
curing temperatures may be employed, such as cotton,
burlap, rough felt, glass ?bre yarns, yarns made of ‘acryl
therefor, and
1 part by weight of a color paste, the color base being
a dispersion compatible with resin and which will with
or iron, the design of which may be found desirable to
30 stand the high heat treatment of the molding cycle, i.e.
impress on the buttons.
umber for brown and red oxide for red.
Material such as table salt and saw dust may also be
A quantity of solvent in accordance with the coating
employed, in which case when the mold is opened at the
method to be employed is then added Le. a very dilute
stage after the initial cure has been effected, as in FIG
quantity of the dry ingredients for spraying, and a lesser
URE 3, the particles of table salt or saw dust are sprin
kled onto the exposed faces of the buttons while in their 35 quantity of the solvent for brushing and dipping.
The particulated material, such as open netting of mono
respective cavities. Thereupon the mold is closed to im
?lament nylon is coated, for example by spraying, is air
press the outline on the charge and heat and pressure
dried for 10 or 15 minutes and is then ready for use.
applied to effect a full cure. The mold sections are
ics, panels of wire screening, such as aluminum or copper
moved to the partially open position and the particles of
The heat curable, potentially reactive pellet charges are
table salt or saw dust brushed off mechanically, in a
manner so as not to dislodge the charge from the under
loaded in the mold cavities of a compression mold as
‘described (or an opposed mold section in the inverted
lying mold cavity and while the residual heat of molding
position of the mold sections), the mold being provided
with means for heating and applying the pressure in ac
is retained. Thereupon the mold sections are moved to
cordance with the prior example, depending upon the
the knock out position, to collect the charge so released
from the mold.
45 particular thermosetting resin which is to be processed—
in this example, melamine. The mold sections are closed
By reason of the three dimensional and open work
to apply approximately 3000 pounds pressure per square
factors of the strippable sheet materials which I have
inch at a temperature of 350° F. for 25 to 35 seconds for
described to furnish the decorated impression, I refer
mold cavities of 15 to 30 ligne buttons.
.
to both the sheeted fabric and the particles as “particu
lated material.”
At approximately the end of this time exposure of
50
curing and when the charge separates from the mold
Thus, by a judicious choice of particulated material or
and is glassy in appearance, it is substantially fully cured
particles which are not too abrasive to the die but have
but, at the molding temperature is still deformable.
,
su?icient resistance to avoid distortion while imparting
The mold sections are then moved to the partially open
their outline to the deformable charge while it is still
resilient, designs may be economically impressed upon 55 position and the face side of the buttons to be embossed
are covered with open work netting coated with the heat
buttons for short runs, to test out their suitability and
curable resin as described. The mold sections are imme
commercial acceptance.
diately closed to the full pressure and heating conditions
In this manner, the unusually heavy cost of etched
previously described for 5 to 30 seconds. The mold is
metal dies is ‘avoided, while still permitting the prepara
tion of buttons having varied designs thereon for little 60 then partially opened and while the charge retains the
more than the cost of smooth faced buttons by the use of
simple dies whose overall simple surface can be used for
?nal cure without distortion of the design after removal
of the particulated insert.
heat of molding, the netting is stripped quickly from the
face of the buttons molded and the mold sections then
moved to the fully open or knock out position.
It is to be understood that in a mold not provided
While I have described and illustrated melamine, a 65 with knock out pins, the entire sheet of netting, including
wide variety of synthetic, thermosetting condensation
the adherent buttons, is stripped from the mold and im
mediately passed beneath a stripping knife.
products may be employed and for this purpose other
During the application of the pressure at the tempera
aminoplasts, such as urea formaldehyde resins, aniline
formaldehyde resins may be employed; also the pheno~
ture described, a transfer or bleeding of the pigmented
plasts, such as phenol formaldehyde, furfural fomalde 70 lacquer base has occurred, to result in having the coating
of lacquer on the nylon ?laments enter the grooves 14a
hyde condensation products; also the polyesters such as
of the button base and fuse therewith and become cured
the alkyd resins and unsaturated polyester resins; also
the polyethers, such as polyoxymethylenes and epoxy
to the button base (as shown in FIGURE 8a, which is a
fragmentary magni?cation of the matter encircled in the
resins, the time, temperature and pressure in each case
being variable in accordance with the size and kind of 75 circle 8a, FIGURE 8). A permanence of shade tone is
3,075,249
dividual, shaped unit-ssubs‘tantially fully- cured tor'th'e stage
thereby eiifeotecl',~'to‘v secure a two toneeffect of the button,
enhancing the-embossed- appearance of the; ?nished prod
uct" without‘ detracting’ from the launderability or- clean
wherein the same‘ are highly glazed and are‘ separable
ability or wear resistance oi the button-base.
exposing‘ a surface of said- units, applying? over said- ex
from the moldlpartsewithout tearingfbut- stilldeformable,
_
’ Variatioasinwork-ing formulations known in- the mold
ing’ artv for the partioularresinous bases’ previously ex
a?
posed surface a pliant particulated fabric readily deforma~
empli?edewillfnow readily become apparent, itbeing-noted
ble to conform to the surfaces of the‘ exposed units, re
applying- mold pressure to said- articles -» through 1 said fabric
that the pigmented lacquer base applied to the particulat
ed'material', to be introduced into the mold in the uncured
stage; is one which is; not very compatible- with the’ partic
ulated» carrier- but‘ is interfusible with the button base
exposedrsurface of saidunitsin asecond- forming opera
tion, completing the cure’ of said; articles after the same
have been impressed, and removing the particulated fabric
composition; to fuse and cure to the thermally infusible
fromsaicl articles‘
stage.“
to impress the'design'of thepar-ticulated fabric-onto said
Buttons may _be made to “simulate colored, leather
covered and embossed buttons of highly attractive nature, 15'
by compressionmolding in' multi-cavity molds.
Having thus described my invention and illustrated-its
use, what I cla'im'as new and desire to- secure by Letters
Patent ‘is:
_
g
7
v
3. The method in accordance with claim 2 wherein said
'
fabric constitutes nylon ?laments. _
‘
4.’ The method of- simultaneously forming a plurality
of hard, shaped, surface-decorated articles of synthetic
resinous thermo-setting condensation products, which. in
cludes the steps of molding'in a multiple unit mold under
heat and pressure a charge of such resinous material in
_
l.» The- method of simultaneously forming a plurality
of hard, shaped“, surface-decorated articles of synthetic
resinous; thermo-setting condensation products, which in
20 its potentially reactive stage to form a plurality of in
cludes the steps of molding in a multiple unit mold under
dividual, shaped units substantially fully cured to the
stage wherein the same’ aresepa'rab'le from said’ mold’ parts
without tearing. but still deformable, exposing a- surface
heat and pressure a~_charge of such resinous material in'
its potentially reactive stage to form a pluality of in
dividual, shaped unit's sul'nst'an'tiall'y'v fully cured to the
particul‘ated material" readily deformable to conform to
the surfaces of‘ the exposed units, said'mat'erial'car'ryiiig
of said: unit-s, applyingiover‘ said'ex'posed surface a" pliant
stage wherein the same are‘ separable from the mold parts
a-hcat fusible, pigmented lacquer‘ coatingreapplying‘ mold
without tearing but‘still deformable, exposing a surface
of said'units,-applying over said exposed surface a‘pliant
particulated' material’ readily deformable to conform to
the surfaces of the eiipos'ediuriits', reappiying mold pres
pressure to said articles through said‘ material‘ to'iinpress
the‘ design of the particulat'ed‘ material onto said_ exposed‘
s'nrface of said unit-s in‘a'secoiid' forming; operation,‘ arid
sure to said articles through said'mate'ria'l‘ to impress the
design of the particulated material onto said exposed sur
been impressed, and stripping’the ‘material from the shaped
aritic'les whereby‘ the articles retain the impressed‘, pigment‘
face of said units"
a secena‘rom'iing operation, complet
ing the cure of said artieles'arfer the‘ same‘ha-ve been‘ im
pressed, andir'em'oving the-'parti'culat‘ed material from'sa‘id
articles,
I
‘
‘
_2L The method of simultaneously forming‘ a plurality
of hard, shaped, surfaceldec‘drated articles of synthetic
resinous thereto-seeing condensation products‘, which in
cl'udes the sewer‘ molding in a multiple‘ unit mold' under
heat‘ and pressure a chargeof such resinous material in
its potentiallyreacti've" stage to form a plurality of in
completing the cure of said articles after‘ the same‘hav'e'
edl design“ on said surface.
,
l
5. The method in accordance ‘with'clainif 4, whereini the
particulatecl‘ material comprises‘ absorbent fabric.
References Cited’iin'tlie ?le of this‘pa'tent
UNITED STATES» PATENTS.
1,975,050‘
' 2,208,494
Ritchie‘ ________ _~_ _____ __ 0a. 2a, 1934
Broderson ___.__;_ ______ __-._ Iuly1'16',‘1-940;
2,250,958
Kautter‘ et'al. __~_' _______ __ Iuly- 29; 194i
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