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Патент USA US2115403

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April 26, 1938.
Filed 0017. 27. 1936
Petented Apr. 26, 1938
Human Petrus Verschragen, Arnhem, Nether
lande, a.ssignor to Amerlcan Enka Oorporn
tien, Enka, vN. C., a corporatlon 01 Delaware
Application October 27, 1936, SGl'lll N0. 107379
In Germany Manch 19, 1936
ä Claims. (GI. 204-1)
This invention relates to repairing spinnerets
employed in the manufacture of a‚fti?cial silk,
and more particularly to a method cf protecting
the sharp edges surrounding the minute ori?ces
in the spinneret'duringthe repairing steps.
The type of spinneret with which this Inven
tion is particularly concerned is a small, eup
shaped die having a base platze perforated with
minute ori?ces through which‚ a. cellulosic spin
10 ning solution is extru_ded into a coagulating bath
to form ?laments. These spinnerets must be
constructed of materials which will withstand
in connection with the accompanying dra.wing
Figure 1 is a top plan view of a, galvanizing ap
Figure 2 is a. cross sectlon taken on llne a-—a
of Finne 1, and
Figure 3 is an enlarged detailed view 111m?
tra‚ting a. }modi?ed method o! removing air buh
bles from the openings in the spinnex‘ets.
Referring to the dr9.wing, numera.l I designates 10.
a. glass vessel contalning a.‘ galvanizing solution
of nickel sulphate.‚ A nickel platze 2, acting as»
the severe conditions to which they are normally 'the anode of an el<äctroplating assembly, is sub
subjected during the spinning operations. For merged within the tank and suspended in the;
practical working conditions, spinnerets formed solution by mea.ns of a. of insulated arms 3. 15
of precious metals such es gold and platinum or The upper ends of the arms attached to the
their alloys are employed to the best advantage. plates 4 located an the rim of the tank. One of
These metals are substantially non-oxidizable‚ these arms is provided with a. post 5 for connec'
resistant to c_hemlcal action, and su?iciently du—y tion to the positive pole oi' an electric battery
20 rable to permit use over lang perlods o1’ time‘ with-’ (not shown) or Seine other source of electrit:
out frequent replacement.
Although these precious metaispinnerets are
the most suitable for the manufacture of arti
within the tank and acts es the ca‚thode. The
disposition of this sheet is such that it is nor-'
mally Suspended adjacent to the surface of the
?cial silk, they a.t times, da become damaged due
to use over prolonged periods. During the spin
ning operation, incrustations form around the
edges of the ori?ces thereby decreasing the di
ameters or often entirely closing the minute
electro-plating solution and preferably a small>
distance above the solution. The perforations er
openings ‘I within the sheet 6 are adapted to sup
openings. This necessitates the removal and re
port individual spinnerets 8.
placement of the clogged spinnerets. Moreover,
are inverted so that thelr bases are below the sur-A
These spinnerets
the continuous use of the spinnerets in the spin
face of the electro-plating solution.- A plurality
ning operation causes a wearing _ down of the
of rods 9 are bent a.t their lower ends to support
edges of the openings and distorted places to 0c
the nickel sheet 6 and at I;heir upper ends
hooks III adapted to ansage the rim of the tank.
cur in the bases.
A perforated nlckel sheet 6 is also disposed
The spinnerets which become impaired through
usage were for the most part retu.rned to the
manufacturer to be melted and reworked into
new spinnerets. This seemecl to be a necessary
expense, es in order to recondition the defective
40 spinnerets, a success'ful polishing of the faces of
the spinnerets had to be e?'ected. However, the
polishing action itself tended to damage the sharp
edges of the ori?ces, which edges were already
defective a.s a result of‚ wear and corrosion, there
45 by increasing the objectionable results.
It is therefore the object 015 the presen't Inven
tion to overcome these di?iculties by providing a.
method oi‘ depositing a layer cf a base‚metal, for
example, nickel, upon the face 01 the spinneret
50 and upon the inner walls of the minute ori?ces,
whereby the sharp edges 01 the ori?ces pro
tected from the action of the polishlng agent un
til the damaged portions have been removed.
Additional objects will be apparent from the
55 1’ollowing detailed description when considered
The negative post II may be located on any one
of the rods and connected to the electro—plating
In conducting the process the spinnerets are
?rst thoroughly cleaned in a, bichromate su1
phurlc acid bath, rinsed wlth clean water and
thereafter positioned within the openings of the
nickel sheet acting as the cathode. The height
of the electro-plating solution is such that the
spinnerets are partlally submerged within the so
lution. The Current is then turned on whereby
the bases of the spinnerets and the walls cf the
ori?ces thereln are electro-plated with nlckel.
In order to ins11re that all o1’ the ori?ces will
be compietely ?lled with the electro-plating so
lution, rubber tubes I2 or the 1ike as indicated
in F'igure 3_ may be ?tter! into the spinnerets
and the solution dra.wn therethrough by means
of suction. This application of suction to the
spinnerets also functions to withdraw minute
air bubbles whlch are present within the oriflces
und which would otherwise inhlblt the free cir
culation of the electro-platlng solutlon. T0 fur
ther gua.ra.ntee the removal o1’ the air bubbles the
nickel sheet may be removed at lntervals und
thoroughly shaken.
The electro-platlng operation l_s contlnued un
til a layer of metal has been d‘eposited to the
extent of from 10 to 15 mu. After the comple
tion of the electro-plating, the spinnerets are
ployed in the manufacture oi artl?cial silk whlch
comprlses partially submerging each of a‚ plu
rallty of splnnerets in an electrolyte and electro
pla‚tlng a layer o1’ metal on the bases Lhereol' und
around the walls of the ori?ces in ‚the bases to
thereby protect the sharp edges surroundlng the
ori?ceä during future polishing, polishing am!’
grinding the sald bases to remove the damaged
portlons and.substantlally all of the base coa.tlng
10 removed und polished untll the damaged por- . therewlth while maintaining Lhe edges of the
. tions have.been r'emoved.
It may be necessary
to continue such pollshing until substantlally all
of the plated metal is removed. The layer o1’
metal prevents injury to the sharp edges of the
15 ori?ces. The layer of metal retained within the
ori?ces may be easily removed by acid treatment
such as d1pping the spinnerets in _a‚ streng nitric
acid at approximately 80° C.
‘ It 1s to be understqod that modi?catlons may
be ma‚de in the process without departing 1'rom
thespirlt und scope of the invention. Fox- in
stance, a number of dl?erent metals may be em
ployed for electro-deposition on the face o1’ the
spinnerets und in such other metals would
be max-e su\itable .for the cathode and the anode.
Wha.t I claim ls:
l. A method of reconditionlng splnnerets em—
ori?ces intact, and. ?nally removing the. metal
coatlng remaining in the ori?ces with a. solutlon
of nitrlc a.cid.
v2. A method of repairlng spinnerets employed
in the manul’acture of arti?cial silk whlch com
prises coatlng the surface of the spinnerets and
the walls of the ori?ces therein with a layer of
metal by electrolysis to protect the sharp edges
surroundlng the o'ti?ces, increasing the pene
tratlon cf the electro-plating solutlon into the’
ori?ces by subjecnng the spinnerets to suctlon.
polishlng the faces of the spinnerets to elimi
nate damaged portions und thereafter removing
the remainlng metal coating by subjecting the
spinnerets to the action of an acid. bath.
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