An Improved Process for Manufacturing Seamless Caoutchouc Ware.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
An Improved Process for Manufacturing Seamless Caoutchouc Ware.
We, ERNST GUSTAV ZIEGER, of 25, Könneritz Strasse, and ERNST EMIL WIE-
GAND, of 27 Könneritz Strasse, both of Leipzig, in the Kingdom of Saxony,
German Empire, Manufacturers, do hereby declare the nature of this invention
to be as follows:-
Hitherto when manufacturing seamless caoutchouc ware by covering forms
with several layers of caoutchouc solutions, there was found the inconvenience
that sometimes large quantities of the ware were blistered. The side walls of
the articles, which in these cases only were thin, showed large blistered parts,
which at the least pressure became untight.
By means of our improved process which will be fully described hereinafter
this inconvenience will be prevented.
con-
We have found that the blistering took place at a certain degree of humidity
of the air. The low temperature of the vaporizing dissolving ingredient
upon the surface of the freshly dipped. caoutchouc layer effects a
densation of the humidity of air in form of a precipitation of
water, so that when further layers of caoutchouc solution are brought upon the
first layer, the dew remains between the different layers and causes the above
mentioned inconvenience in the wall of the caoutchouc ware.
The improvement forming the subject matter of the present application con-
sists of drying the freshly dipped caoutchouc ware in an atmosphere which
either is rendered completely dry or from which humidity is removed to such
a degree that the low vaporization temperature upon the surface of the drying
goods does not allow the precipitation of water. The whole or the partly drying
of air can be effected in different well known manners, either by chemical
means or physically by cooling the air to a degree lower than the vaporization
temperature existing upon the drying caoutchouc ware. In the latter case; the
process offers the advantage that the source of cold serving to dry the air
simultaneously is used for the condensation of the vapors of the caoutchouc dis-
solving ingredient.
•
The process is executed in such manner that the drying caoutchouc ware after
each dipping is brought into a closed space and that a stream of dry or of
partly dry air is conducted through the same. In case where the drying has
been attained by cooling of the air, the vapours escaping from the closed drying
receptacle advantageously are conducted back to the cooling apparatus, whereby
the dissolving ingredient again is condensed and used.
Dated this Twenty-sixth day of September 1899.

page_text: COMPLETE SPECIFICATION.
An Improved Process for Manufacturing Seamless Caoutchouc Ware.
We, ERNST GUSTAV ZIEGER, of 25, Könneritz Strasse, and ERNST EMIL WIE-
GAND, of 27 Könneritz Strasse, both of Leipzig, in the Kingdom of Saxony,
German Empire, Manufacturers, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement --
Hitherto when manufacturing seamless caoutchouc ware by covering forms
with several layers of caoutchouc solutions, there was found the inconvenience
that sometimes large quantities of the ware were blistered. The side walls of
the articles, which in these cases only were thin, showed large blistered parts
which at the least pressure became untight.
By means of our improved process which will be fulls described hereinafter,
this inconvenience will be prevented.
upon
the
a
of
We have found that the blistering took place at a certain degree of humidity
of the air. The low temperature of the vaporizing dissolving ingredient
surface of the freshly dipped caoutchouc layer effects
condensation of the humidity of air in form of a precipitation
water, so that when further layers of caoutchouc solution are brought upon the
first layer, the dew remains between the different layers and causes the above
mentioned inconvenience in the wall of the caoutchouc ware.
The improvement forming the subject matter of the present invention consists
of drying the freshly dipped caoutchouc ware in an atmosphere which either is
rendered completely dry or from which humidity is removed to such a degree that
the low vaporization temperature upon the surface of the drying goods does not
allow the precipitation of water. The whole or the partly drying of air can
be effected in different well known manners, either by chemical means (chloride
of calcium) or physically by cooling the air down, so that the dew point of the
same is reduced below the temperature at which the volatile matter is vaporized
or dried. In the latter case the process offers the advantage that the source of
cold serving to dry the air simultaneously is used for the condensation of the
vapors of the caoutchouc dissolving ingredient.
The process is executed in such manner that the drying caoutchouc ware after
each dipping is brought into a closed space and that a stream of dry or of
partly dry air is conducted through the same. In case where the drying has been
attained by cooling of the air, the vapours escaping from the closed drying
receptacle advantageously are conducted back to the cooling apparatus, whereby
the dissolving ingredient, benzine, sulphuret of carbon or the like, again is
condensed and used.
The same process can advantageously be employed at the vulcanization of
caoutchouc ware in a cold state, that is to say, by treating the ware with sul-
phuret of carbon, chloride of sulphur or like vulcanization, mediums. At the
hitherto employed way of vulcanizing the ware gets covered with a dew preci-
pitation, which blinds the same. When the vulcanization is executed under a
current of dry air in the same manner as heretofore described, this drawback
does not appear to take place any more?
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
1. An improved process for manufacturing seamless caoutchouc ware, consist-
ing of drying the ware after each dipping in an air stream which completely

page_text: or partly is rendered dry, so that the precipitation of water being the conse-
quence of the vaporization of the dissolving ingredient is prevented, for the
purpose and substantially as described.
2. A process for preventing blisters in the manufacture of seamless caoutchouc-
ware, consisting of drying the air by cooling it down to a degree lower than
that of the temperature at which the volatile matter is vaporized or dried, so that
the humidity of the air is condensed before the latter enters the drying chamber
for the purpose to dry the ware, substantially as described.
3. An improved process for manufacturing seamless caoutchouc ware, consist-
ing of drying the goods, after each dipping and means for effecting this drying,
substantially and for the purpose as described.
Dated this 20th day of June 1900.
GEO. H. RAYNER.
37, Chancery Lane, London, Agent for the Applicants.