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Патент USA US3073725

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Jan- 15, 1963
s. M. GRISWOLD
3,073,715
METHODS OF MAKING FLOCKED SOLVENT ACTIVATABLE
STIFFENING AND SHOE LINING MATERIALS
Original Filed Aug. 7, 1958
[nven for
Jt‘anley M. Griswold
B his fh‘t‘orne
United’ States Patent Office -
, 3,073,715
Patented ‘Jan. 15, 1963:
2
1
solvent activation through swelling of the ?ocking ad; ‘
3,073,715
'
V hesive by certain solvents like toluol.
METHODS ()F MAKING FLGCKED SQLVENT
ACTKVATABLE STIFFENING AND SHOE
LINING MATERIALS
Stanley M. Griswold, Newton, Mass, assignor, by mesne
assignments, to United Shoe Machinery Corporation,
Further features and advantages of the present inven
tion will best be understood by reference to the follow
ing description in connection with the appended draw
ings, in which
'
‘
FIG. 1 is a counter dyed out of material made in ac
Flemington, N.J., a corporation of New Jersey
Original application Aug. 7, 1958, Ser. No. 753,717, new
cordance with the present invention;
Patent No. 3,022,188, dated Feb. 20, 1962. Divided
FIG. 2 is a greatly enlarged partial seotionthrough a
and thisapplication June 26, 1961, Ser. No. 112562 10 sheet of such material; and
4 Claims. (Cl. 117-25)
FIG. 3 is a diagrammatic illustration of a method of
manufacturing the material of the present invention.
This invenltion relates to shoemaking and more par
> Referring to FIGS. 1 to 3, the sheet material provided,
ticula-rly to methods of making sheet material for pro
by the method of the present invention comprises‘ a base
viding solvent activatable stiffening elements for shoe
uppers. This application is a division of my application 15 10 of single mapped ‘fabric such as cotton ?anel carry
Serial No. 753,717, ?led August 7, 1958, new Patent No. . ing in discontinuous form a stiffening agent capable of
being ‘coalesced upon activation with a solvent. Con~
3,022,188.
’
veniently, the material may be prepared by passing-the
Much effort has been devoted in the past to provide
base through a bath 12 containing‘a liquid mixture of a
economic materials for and methods of stiffening selected
stiffening 'agentvin' a form appropriate to ‘deposit the
portions of shoe uppers. However, the difficulty of pro
stiffening agent in the base in- a discontinuous form when
viding a stiffening element for the heel portion or an un
the sheet is thereafter dried. Two well-known stiffen
lined shoe which combines. pleasing appearance, good
ing agents used in preparingsolvent ac-tivatable stiffener
wearing qualities, and ease of activation, with initial con
material are cellulose nitrate ‘and polystyrene. Either
formability has left much to be desired in materials
25 of-these agents may be used although I prefer the cellu
lose nitrate because of its‘ better adhesive qualities; '
In the past there has been developed a' stiffener ma
Where cellulose nitrate is employed as the stiffening
terial comprising a porous base impregnated in discon
agent, the fabric 10 is passed through the bath 12'con
tinuous form with a stiffener agent such as cellulose ni
taining ‘the cellulose nitrate dissolved in a solvent. After
trate or polystyrene resin and hence adapted to be sol
vent activated to cause the material to become stiff after 30 leaving the bath 12, the fabric is passed between strip
ping rolls 14 which are adjusted to remove sufficient of
evaporation of the solvent. Stiffener elements died out of
the cellulose solution from the unnapped side of the fabric‘
such material have been used extensively for shoe ‘toe
stiffening. However, such material has had little use 7 ' so that after drying there is'not'su?'icient stiffening agent ‘
‘left on-this side of the material completely to cover the
in heel end stiffening, particularly since efforts to pro
hitherto
available.
,
,
i
‘
.
'
vide a layer of flock on. such material for use in unlined 35 threads of the fabric thereby permitting the ?ocking ad
shoes hadpproved unsatisfactory because the flock to-v
.gether With‘layer of'?ocking adhesive tended to crack
hesive‘to come into direct contact therewith.
on flexing of the material and to peel away too easily
the fabric 10 passes through a water-bath 16.
From the
stripping rolls, if the stiffening agent is cellulose‘nitrate,
This bath '
is not employed Where the stiffening agent is polystyrene
from the underlying surface of the stiffener sheet.
‘
40 which is preferably applied in the form of the latex of
_
It is accordingly an object'of the present invention to:
provide an improved method of making ?ocked solvent
the type disclosed in United States Letters Patent No.
activatable sheet stiffener material by the-use of which‘
' 2,760,884, issued August 28,~ 1956, on an ‘application ?led
in the name of George Leonard 'Graf, Jr. The fabric is,
'. method material having securely bonded flock may be. '
prepared.
’
" then'dried in a drying'loven 318 and after passing over
45
-
vTo this end'and in‘ accordance with a feature of th
invention, a method is provided featuring the steps of
’
idler rollers 20, proceeds 'to a conventional ?ocking of
the unnapped surface wherein a ?ocking adhesive 32 is
applied from a trough ‘22 and ?ock 34 is applied from a ‘
treating a single napp'ed fabric'b'ase to deposit therein in
discontinuous form a‘ stiffening- agent coalescible by sol
vent,v said: treatment including impregnating the fabric
with a liquidicomposition. comprising a stiffening agent
and removing from the unnapped side of the fabric suf_li-’v
second trough. 24 followed by beating with ‘a bar 26.
After this'the stiffener material passes throughran oven
28 to evaporate the solvent~of the ?ocking-adhesive and
\to cure it, and the ?nished'material-is then taken up on ' > ‘Y '
' ‘ cient of the impregnating composition toeXpose th'epsur
face of the fabric in its treated and ‘dried condition, dry_-' :.
FIG.
a roll 2,30.applied
' The in
layerl'32rof
this .manner
?ocking
maybe
adhesive,
either porous
shown or;
in -'
ing the treated fabric, applying a layer of ?ocking adé," 55 hesive
nonporous
is preferable
vas'desired.to preventfdistortion,
porous -?lm"'of blistering
?ocking ad;
or‘ I '
hesive to the unnapped surface, applying a layer of ?ock
swelling on contact with some solvents; To provide} a‘
. .over the adhesive layer 1and drying the adhesivepfihev
successof the “method depends to, ajlarge extent upon i‘ ‘ porousadhesive layer it is ,usuall'y'suf?cient- to employ}
low solids and relatively low,gviscosity adhesive", such as;
.60 #1734, a curing neoprene ?ock'ad‘h’esive using aromatic
wt‘o expose the surface of the fabricand “thus provide a ~ j solvent, made,'by'B;1»B.,ChemicalfCo.,_Cambrikdge,l'M as‘.
the use of a single napped fabric and in the, removal from
theunnapped surface thereof of sufficient stiffening agent
I p In ‘some cases, howeve'r?wa conventional ?ocking adhesive
may be employed ‘whe'r activation .w_i11"~bej_penformed}
invent-ion comprises afsingle'napped fabric impre'gn‘ated,,v" 5- by?’ application of solven' only tothe un?ockedsurfac
‘ ",?rm
' K-The
base
material
for the ?ocking
providedadhesive.
"by-1 the 'method‘ofgthe
I“ ‘present
‘(is ‘of ibeisti?snsr material,
'
;_with a-solvent coalescible sti?eningilag‘ent'in discontinul
, 7 (ins term and av‘layer'of flock bondedto the ,pnnapp‘ed: i If The ?nished-material ma
'shoeilining;elementssichta
- lgglsiicleby
‘ imposedaflayer‘ofiadhesivegwhich,‘instead'of;
ion-a layer vof stiifeninglageit‘cov, iringjthe fabric,‘
" "
‘ mFIGE'l/ lnithedry?for ,
U
.. vwith'outilcrackin'g"theflocked
‘ "his ‘directly engaged with the fabric surface‘;
'
.
Preferably,':"also_, the ?ocking,adhesivelwillv bepfporious
' to minimize'dan'ger'oflblistering the’?ockfsiirface during
_‘
M
T
a
this rounteri'maiy be, flexed
‘
surface
andv;?ock_;“is "so '
' securelylilibo'nded to the fabricfbase‘y
‘_ removable. "'._ Previous ‘efforts’ to flee
impregnate/din discontinu
I
ll
3
3. The method of making sheet stiliener material for
had resulted in a material having defects corresponding
to the aforesaid good qualities of the present material
lining shoes and the like comprising treating a single
napped fabric base with a solvent coalescible stiffening
agent to dispose said agent within the fabric, the surface
which I believe arose because of the substantial layer of
stiffening compound covering the fabric surface to which
it was quite loosely bound and which a?’orded a very
U!
coating of said agent on the unnapped side of the fabric
insecure surface for the ?ock anchorage through the
?ocking adhesive not only before but during activation.
being su?icient to embed all threads of said fabric, apply
ing a layer of ?ocking adhesive over said unnapped side
shoes and the like comprising treating a single napped
solvent coalescible stiffening agent, said treatment includ
and applying a layer of ?ock over the adhesive.
Having thus described my invention, what I claim as
4. The method of making sheet stiffener material for
new and desire to secure by Letters Patent of the United
tates is:
10 shoes and the like comprising treating a single napped
fabric base to deposit therein in discontinuous form a
1. The method of making sheet stiffener material for
vfabric base to deposit therein in discontinuous form a
ing impregnating the fabric with a liquid composition
comprising said agent while leaving on the unnapped side
solvent coalescible stiffening agent, said treatment, in~
eluding impregnating the fabric with a liquid composition
comprising said agent and removing from the unnapped
side of the fabric su?icient composition to expose the
fabric surface in dried condition, applying to said un
of the fabric insufficient composition to cover complete
ly the fabric surface in dried condition,_ applying to said
unnapped side of the fabric a layer of ?ocking adhesive
which is porous in its dried condition and applying a layer
napped side of the fabric a layer of ?ocking adhesive . ,
of ?ock over said adhesive.
and applying a layer of flock over said adhesive.
2. The method of making sheet sti?ener material for
shoes and the like comprising treating a single napped
fabric base with a solvent coalescible stiffening agent,
said treatment including impregnating the fabric with a
vliquid composition comprising said agent and removing
from the unnapped side of the fabric su?icient composi
tion to expose the fabric surface in dried condition, ap
plying to said unnapped side a ?ocking adhesive in sol
vent solution, applying a layer of ?ock over the adhesive,
and applying heat to evaporate the solvent and cure the
adhesive.
References Cited in the ?le of this patent
UNITED STATES PATENTS
25,192
1,391,932
92,067,239"
‘2,358,204
2,567,327
2,619,441
2,887,400
Goodyear ____________ __ Aug.
Beckwith et a1 _________ __ Sept.
Mayo et a1; __________ __ Jan.
Bird ________________ __ Sept.
Ewing ______________ __ Sept.
23,
27,
12,
12,
11,
Levy' ________________ __ Nov. 25,
1859
1921
1937
1944
1951
1952
_ Pollack _____________ __ May 19, 1959
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