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Патент USA US2110011

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. March 1, 1938. _
Filed Oct. .24,_ 1934
Patented Mar. 1,1938
it v
‘Walter inc
it so
li, Fiarcelcna, dpaln, assignor tc
insnlatus it. ill“, Mug, ?witaerland, a joint-stitch
company oi‘ Swltnerlantil
Application ilictober 2th will, denial hie. ‘lllilt'i’tt
in Germany iictoher til, Mitt
2 Claims.
(bi. nay
rI'he present invention concerns a process and
According to one embodiment, the. roller is
a device for enameling and varnishing wires,
covered with felt or other absorbent material and
rotates slowly above a bath of solution of enamel
or insulating material in which it dips deeper at
one end than at the other.
strips or the like.
in the enameling processes known ‘hitherto the
5 wire or strip is allowed to pass along a member
to which the solution to be applied is fed by any
appropriate means. The ?rst coating of enamel
which is thus applied on the wire is dried in an
oven, after which the wire receives a fresh coat
10 ing by passing it again over the same member
and so forth, until the enameling operation is
completed. The ?rst coating of enamel is thus
subjected to the drying operation as many times
as the wire receives successive coatings. in the
i5 enameling processes known hitherto, the ?rst
coating of enamel is by far the thinnest and con
sequently the most fragile, which according to
experiment must be due to the fact that the coat-=
ing of enamel which has set is all the thinner
20 as the diameter of the wire is smaller. in other
words it has thus been established that in the
mass in which the diameter increases, the thick
ness of the coating of enamel which has set like
wise increases. It results from the foregoing, on
Other characteristics and pecularities will be
come apparent i'rorn the ensuing description and
the drawing.
in the latter:
Fig. l is the view of a device for carrying out 10
the enameling process according to the inven
Fig. 2 is a plan view of the enamel applying
Fig. 3 is a side view in section-along the lines
m--llii oi Fig. 2.
The apparatus shown diagrammatically in the
drawing essentially comprises a container l for
the solution of enamel or insulating material with
which the wire or ribbon is to be coated, and also 20
in the upper part of said container a conical
roller which. rotates slowly about a spindle 2.
According to the invention, the roller is covered
with felt or other absorbent material. As seen in ~
the thinnest, and the successively applied coat
Fig. l, the lower generatrix t of the roller clips 25
at varying depth into the bath of solution t.
ings increase in thickness and, on the other
Furthermore, as seen in Fig. 2, the roller is ar
hand, that the thickest coating is precisely the
ranged so that its lateral generatrix t is located
outside the container i. The wire'or strip, in
dicated at‘ the various positions by a, a’, b, b’, c, 0', 30
cl, d’, and e to be coated passes against this lat
eral generatrix. The place where the wire ?rst
_ 25 the one hand, that the ?rst coating of enamel is
one which is the least subjected to the oven
3li drying operation.
It results furthermore that under these con
ditions of enameling and drying, the total mass of
enamel distributed around the wireis not homo
geneous. Owing to this and to the fact that the
35 ?rst coating is‘ very thin and is treated to too
much in the drying oven, said coating does not
adhere suf?ciently to the conducting wire and can
‘even become completely separated from the lat
ter in the form of a tube. Furthermore the dif
40 ferent layers do not have the same dielectric re
sistance, and from layer to layer there is \a dif
ferent resistance to acids and benzol.
With the process of enameling or varnishing
passes over the roller 3 is shown by a line or point
a respectively, i. e. the wire passes ?rst of all
along the portion of the conical roller 3 which has 35
the largest diameter. it thus receives a ?rst coat
ing of, enamel. Thereupon the wire is dried by
the drier l, and then passes at the line b a second
time over the roller 3, whereby it receives the sec
ond coating of enamel. After the second coat 40
ing the wire is again dried, whereupon the process
is continued in the same way up to the last coat~
ing. In the example illustrated, it has been as-v
according to the invention, these drawbacks are e sumed that five successive coatings are applied,
45 overcome by the fact that successive layers of but obviously this number is quite arbitrary and is 45
decreasing thickness are applied on the wire or only an example, which can be varied according
the strip to be treated.
to circumstances.
The invention furthermore concerns a device
As can be seen in the device described, the
for carrying out the above process. Said device wire in the position a comes in contact with that
50 essentially comprises a roller over which the wire part of the roller which receives the greatest 50
passes several times at points spaced apart along quantity of enamel solution, since the corre
its generatrix ‘and on which a solution of enamel sponding end of the roller 3, dips deepest into the
of insulating material is applied, the quantity of bath. Under these conditions the layer of
which decreases from one end to the other of the enamel which is deposited on the line a has the
55 vroller.
greatest thickness. The thickness of the second 55
coating deposited on the line b is slightly less,
of detail could be made therein in the spirit of
and so on up to the ?fth and last coating.
By means of the process according to the in
vention, a mass of enamel or insulating material
the invention.
is thus obtained, the successive layers of which
decrease in thickness, and the thickest layers of
which are subjected the most often to the action
of oven drying.
In this manner a perfectly
homogeneous coating of enamel or insulating ma
10 terial is obtained, which adheres strongly to the
It is pointed out that the embodiment of the
device illustrated in the drawing is only a prac
I claim:
1. Process of insulating wires for electric pur
poses, which comprises alternating steps of coat~
ing the wire with a liquid composition and then
setting said composition on the wire by heat, said
coating steps comprising the applying of the
liquid composition in successive layers of de—
creasing thickness.
2. Process of insulating wires for electric pur
poses, which comprises passing the wire into
contact with the surface of a liquid to coat it
tical example and that the process according to
15 the invention could be carried out by means of
different devices. The essential characteristic of
the device consists in the fact that the quantity
with a liquid composition, alternating said step
of enamel solution distributed over the roller
from said liquid surface to said wire in quantities
decreasing with each successive application,
varies from point to point along its generatrix.
It is obvious that the invention is only de
scribed and illustrated as a practical example
which only serves for the explanation and to
which the invention is not limited. Modi?cations
with the step of setting said composition on the 15
wire by heat, supplying said liquid surface
with said liquid composition, applying the liquid
thereby to coat said wire with successive layers
of decreasing thickness.
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