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Publication
_________________________________________________________________
Number GB400662A
i»?
Title
_________________________________________________________________
EN Title Improvements in the production of artificial filaments
Abstract
_________________________________________________________________
In apparatus for the production of artificial filaments by the
evaporative method, the filtering-device which precedes the spinning
jet is provided with an internal passage whereby evaporative medium
may be passed through the body of the spinning solution contained in
the filter.
The evaporative medium heats the spinning solution prior to extrusion.
Some of the evaporative medium which passes through the cell may be
led outside the filtering-device.
As shown in the drawing, spinning solution passes down a pipe 4 to a
filtering-device 3 wherein it passes through the perforated wall 10
and filter material 9 to the annular space 8, and is extruded from the
annular jet 11.
Heated air passes upwardly through the cell and is withdrawn through
the pipe 13, some of the air passing through a passage 5 constructed
within the filtering-device, while the remainder travels outside the
casing 7 and through a gap 15 in a plate 14.
The proportions of air passing externally and internally of the
filtering-device are determined by the ratio of the area of the gap 15
to the total area of the passages 6.
Shields 16 direct the rising currents of air heated by pipes 17, to
the outside of the filter body.
The air passing through the conduit 5 although cooler than that
passing externally, still has a considerable heating effect on the
spinning solution prior to filtration.
The apparatus may be used for the production of filaments of cellulose
acetate or other cellulose ester or of ethyl cellulose or other
cellulose ether .
Specification
to.
300,998,
[Class 2 (ii), Cellulose and c.], is referred
The Provisional Specification describes also the use of a jacket
around the filtering-device, or solution-supply pipe, hot air being
directed towards and through the jacket in order to heat the solution.
The air for heating the spinning solution may be introduced from the
external atmosphere independently of that forming the main current
within the cell.
Cold
jet.
air
may be introduced into the cell in the neighbourhood of the
Description
_________________________________________________________________
Ii. \_:, 1\ L-\ -'1)1' Application Date:
tXComplete Left: May 1, 1933.
April
30,
1932.
No. 12,476/32. 404 _
Complete Accepted: Oct. 30, 1933.
PROVISIONAL SPECIFICAT[ON.
Improvements in the Production of Artificial Filanments.
),662 I, HENRY DirEYFus, a citizen of the Swiss Republic, of Celanese
House, 22 and 23, Hanover Square, London, W.1, do hereby declare the
nature of this invention to be as follows:
This invention relates to the production of artificial filaments or
the like by the extrusion of a spinning solution into an evaporative
atmosphere, as for example by the extrusion of a spinning solution
containing cellulose acetate or other cellulose derivative in a
volatile solvent liquid. Examples of other cellulose derivatives which
may be spun by this method are other cellulose esters , such as
cellulose formate , propionate and butyrate , and cellulose ethers ,
such as ethyl , methyl and benzyl cellulose .
The invention is concerned with the heating of the spinning solution
prior to its extrusion, the object of the invention being to employ a
gaseous medium for the purpose of applying heat to the spinning
solution.
In the dry or evaporative method of spinning, a spinning jet is
arranged in a spinning cell, the cell being provided with means for
bringing the evaporative medium, usually air, within the cell to the
required temperature to bring about setting of the filaments. This air
is usually caused to flow in a counter-current direction to the
filaments, that is, the air enters at or near an end of the cell
renote from the jet, and is drawn from the cell near the jet, the flow
being induced by suction applied at the outlet for the air. The flow
of air removes the volatile solvent from the filaments, solvent
vapours being carried from the cell together with the air by the
applied suction.
The spinning solution is led to the jet by a pipe connected to a pump,
usually outside the cell, this pipe being in the neighbourhood of the
outlet of the air from the cell, and so under the influence of the
temperature of this air. Generally the pipe is constituted by a filter
immediately connected to the jet, and the relatively slow passage of
the spinning solution through the filter increases the opportunity for
the solution to lie [Price 11-] influenced by the surrounding air.
According to the invention, the supply 55 pipe is surrounded by a
jacket having one or more apertures making communication with the
interior of the spinning cell and connected to a draw-off pipe, so
that heated air can be drawn from the cell 60 through the aperture or
apertures in the jacket itnto Aclose proximity jwith the, supply pipe
before being exhausted from the cell. In this way the heating effect
of the air which is withdrawn can be 65 utilised to a high degree to
increase the temperature of the spinning solution on its way to the
jet.
If desired the whole of the air may be withdrawn in this manner from
the cell, 70 or if desired only a part of the air may be so utilised.
Thus, for example, a further outlet for air may be provided in
connection with the cell so that by regulation of the proportions of
air passing 75 through each outlet any desired heating effect may be
obtained on the spinning solution.
Where a plurality of outlets are provided these may be connected to
separate 80 exhaust systems, or, more conveniently, may lead to a
common exhaust system, suitable means being provided to control the
amount of air passing through each outlet. 85 Where the filter candle
is arranged within the cell, the jacket may be arranged to surround
this candle, being suitably dimensioned to leave a space for the air
to pass round the wall of the 90 candle at the required velocity.
The jacket may be simply constituted by a cylindrical tube closely
fitting round the supply pipe or candle at some distance from the jet
and open at its end 95 nearer the jet, so that the air sweeps along
the space between the tube and the pipe or candle before reaching an
outlet pipe connected to the exhaust system. The jacket may, however,
fit closely round the 100 pipe or candle at both its ends and be
provided with one or more openings or slots, for example slots
runninglengthwise of the jacket, through which the air is drawn into
the vicinity of the pipe or 105 candle.
PATENT SPECIFICATION
As above stated a part only of the air may be utilised for heating the
spinining solution, and in this case the part so utilised may be
brought to a highecr teaperature than that of the air which passes to
the vicinity of the spinning jet. Thus, means may be provided for
separate withdrawal of air which has passed through the vicinity of
the spinning jet, while the air which is to be withdrawn through the
heating jacket may be carried over heating means inl the cell which
bring it to a higher temperature than the remainder of the air. These
heating means may be specially provided and may, if desired, be
carried by or associated with the means for eparating the two streams
of air, or use may be made of the heating means ordinarily provided
for heating the air in the spinning cell.
The cell-heating means may be arranged in the form of a bank or banks
of pipes or a heating jacket by which the air near the walls of the
cell is heated to higher temperature than that at the centre of the
cell. This hotter air may be drawn to the heating jacket for the
spinning soluftion, a shield being employed if desired to insulate the
jet from the action of this air. In the case of dry-spinning apparatus
in which the filaments are extruded downwardly into an -upwardly
rising current of air, convection may 'be utilised to carry the hotter
air ulpwardlv to the heating jacket. The hotter air rising near the
walls of the cell by convection may be prevented from passing to the
jet vicinity and can then be led to the heating jacket, while the
relatively cooler air which has passed near the jet may be separately
withdrawn from the cell.
Shields may!be employed which direct air against the cell-heating
means and maintain such heated air separate from the cooler air in the
cell. If desired, souie or all of the more heated air to be used to
raise the temperature of the spinning solution nmay be introduced from
the outside atmosphere and carried by a pipe over the heating means
within the cell before being discharged round the supply pipe or
candle.
The spinning solution may be heated not only by applying the air to
the outside of the supply pipe or candle, but alternatively or
additional the air may be carried through the body of the spinning
solution by the provision of one or more pipes or tubes communicating
with the interior of the cell and connected to the draw-oft system.
If desired evaporative medium may be introduced into the neighbourhood
of the jet. Thus for example cold air may be introduced so as to
maintain a cool zone round the jet or to overcome any radiation effect
due to the hotter atmosphere which is being led to the heating jacket.
Dated this 30th day of April, 1932.
STEPHENS and ALLEN, Chartered Patent Agents, Celanese House, 22 and
23, lanover Square, London, W[[l]]
COMPLETE SPECIFICATION.
Improvements in the Throduction of Artificial Filaments.
I, {xnRY DRnYrius, a citizen of the Swiss Rfl:phblic, of,Gelanese
House, 22 and 23, Hanover Square, London, W.1, do hereby declare the
nature of this invention and in what manner the same is to 1be
performed, to be particularly described and ascertain ed in and by the
following statement:
This invention relates to the production of artificial filaments or
the
like
by
the
extrusion of a spinning solution into an
80.evaporative atmosphere, as for example biyv the extrusion of a
spinning solution Containing cellplose acetate or other cellulose
der[[a]]tiye
in a volatile solveint liquid. Examples of other
cellulose derixti'ves which may be spun by thlis method are other
cellulose eaters, such as cellulose formate , propionate anid butyrate
. and cellulose ethers , such as ethyl and benzyl cellulose .
The invention is concerned with the 90 heating of the spinning
solution prior to its extrusion, the object of the invention being to
employ a gaseous medium for the purpose of applying heat to the
spinning solution. 95 In the dry or evaporative method of spinning, a
spinning jet is arranged in a spinning cell, the cell being provided
with means for bringing the evaporative mAedium, usually air, within
the cell to i00 tthe required temperature to bring about setting of
the filaments. This air is usually caused to flow in a counter-current
directiOn to 'the filaments, that is, the air enters at or near an end
of the cell 105 remote from the jet, and is drawn from the cell near
the jet, the flow being indhec'ed by' suction applied at the outlet
for the air. The flow of air removes the volatile solvent from the
filaments, 1i1? 40M ,62 e[[g]]. -- -- 400,602 A; solvent vapours being
carried from the cell together with the air by the applied suction.
The spinning solution is led to the jet 5; by a pipe connected to a
pump, usually outside the cell, this pipe being in the neighbourhood
of the outlet of the air from the cell, and so under the influence of
the temperature of this air. Generally 0 the pipe is constituted by a
filter immediately connected to the jet, and the relatively slow
passage of the spinning solution through the filter increases the
opportunity for the solution to be influenced by the surrounding air.
Specification No. 300,998 describes the use of collector devices by
means of which the air may be constrained into the immediate vicinity
of the jet and shows forms of collector devices which serve as jackets
to direct such constrained air to pass into close proximity with the
filter before being exhausted from the cell. In this way the heating
effect of the air which is withdrawn can be utilised to increase the
temperature of the spinning solution on its way to the jet.
According to the present invention, use is also made of the heated
atmosphere for the attemperation of the spinning solution, the feature
of the invention being that the atmosphere is carried through the body
of the spinning solution in the filter. Thus, whether or not some air
is led closely by the outside of the filter, air is carried through
one or more pipes or passages inside the filter, these communicating
directly or indirectly with the draw-off system for the air. In this
manner the spinning solution is heated while it is being filtered.
This step facilitates the operation of filtration by reducing the
viscosity of the solution being filtered, the relatively slow passage
of the solution through the filter body allowing ample time for the
heating influence of the air to take effect.
If desired, the whole of the air may be utilised for heating the
solution, though, if desired, only a part of the air may be actually
carried through the body of the spinning solution.
A form of apparatus according to the invention is shown in the
accompanying drawing as applied to the downward spinning of filaments
into an upward current of air.
The drawing is a sectional view of a spinning cell containing a filter
provided with passages for the interior circulation of air. A filter
Ibody 3 carried by the supply pipe 4 is provided with a central
passage 5 communicating by a number of passages 6 with the outside of
the body.
A casing 7 is secured about the body 3 so as to form an annular space
8 into which the spinning solution fJowvs after passing through the
filter material 9 covering the ouzter perforated wall 10 of the body
3.
An annular jet 11 is secured to the 70 lower end of the members 3, 7,
the passage inside the member 3 thus being in communication with the
interior of the spinning cell 12 through the centre of the jet 11. 775
Air is withdrawn from the cell 12 in controlled amount by the draw-off
13, some of the air passing through the passage 5 while the remainder
travels outside the casing 7. A plate 14 surrounding the 80 casing 7
except for a gap 15 may be used to cause the external air to come into
close contact with the casing 7, and by suitably adjusting the size of
the gap 15 to the total area of the passages 6, the relafive aniounts
of external and internal air may be regulated. It will be readily seen
that in addition to air being constrained into the immediate vicinity
of the spinning orifices, as claimed in Specification No. go
300,998, the air is also caused to heat up the spinning solution on
its way to the jet.
If desired, shields 16 may be arranged over the heating pipes 17 in
the cell 12 95 to assist in directing the stream of air induced by
convection to the outside of the filter body. While the air thus
directed against the outside of the filter body is somewhat warmer
than the air 100 passing from the extrusion zone into the passage 5,
the air passing through the passage 5 has nevertheless a considerable
heating effect upon the spinning solution prior to actual filtration.
105 Having now particularly described and ascertained the nature of my
said invention and in what manner the same is to
Claims
_________________________________________________________________
be performed, I declare that what I claim is:- 1O
1. In the spinning of artificial filaments or the like by the
extrusion of a spinning solution into an evaporative atmosphere,
passing evaporative atmosphere through the body of the spinning
solution contained in the filter preceding the spinning jet so as to
attemperate the solution on its way to said jet.
2. Process for the production of artificial filaments or the like,
said process i20 comprising extruding a spinning solution downwardly
into
an
upward current of evaporative atmosphere and passing
evaporative atmosphere from said current through the body of the
solution con- 1.25 tained in the filter preceding the spinning jet so
as to attemperate the solution on its way to said jet.
3. Process according to either of Claims 1 or 2, wherein the spinning
solution
con400,662
tains
cellulose acetate or other organic
derivative of cellulose .
4. Method of attemperating the spinning solution in a dry-spinning
operation, substantially as described.
5. Apparatus for the attemperation of spinning solution in the
dry-spinning of artificial filaments or the like, said apparatus
comprising a filter adapted to conduct the solution towards the point
of extrusion, and a passage running internally of said filter and
communicating with the exterior thereof, thereby forming means for the
passage of evaporative atmosphere through the solution in said filter.
6. Apparatus according to Claim 5, comprising means for constraining
evaporative medium to pass closely about the exterior of the filter.
20
7. Apparatus for the attemperation of spinning solution in the
dry-spinning of artificial filaments or the like, substan-: tially as
described or substantially as shown in the accompanying drawings. 25
8. Dry-spinning apparatus for the production of artificial filaments
or the like comprising attemperating apparatus as claimed in any of
the preceding Claims 5-7 30 Dated this 28th day of April, 1933.
STEPHENS and ALLEN, Chartered Patent Agents, Celanese House, 22 and
23, Hanover Square, London, W.1. Redhill: Printed for His Majesty's
Stationery Office, by Love and Malcomson, Ltd.-193a
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