US1962605A - Apparatus for spinning cellulose esters dissolved in volatile solvents - Google Patents

Apparatus for spinning cellulose esters dissolved in volatile solvents Download PDF

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Publication number
US1962605A
US1962605A US271912A US27191228A US1962605A US 1962605 A US1962605 A US 1962605A US 271912 A US271912 A US 271912A US 27191228 A US27191228 A US 27191228A US 1962605 A US1962605 A US 1962605A
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United States
Prior art keywords
air
circuit
cells
branch
spinning
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US271912A
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English (en)
Inventor
Mancini Ugo
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Ruth Aldo Co Inc
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Ruth Aldo Co Inc
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/04—Dry spinning methods

Definitions

  • Atmospheres highly charged with vaporized solvents must be provided in the spinning ,cell,
  • the object being to enable the thread to be subjected to agradual stretching without impairing its final properties of elasticity.
  • the proportion of vapors in the atmosphere surrounding the filaments should vary with the alterations in the rate ofspinning, the ,denier of '30 the thread, the diameter and number of the orifices in the spinning nozzle and the concentra-v tion of the cellulose-ester solution employed; ,so that the optimum concentration can be obtained for each group of values of said variables.
  • the present invention provides a system of heating and circulating the air, which enables the various factors to be regulated and at the same time renders possible the recovery of the volatile vapors almost in their entirety.
  • the system comprises or may comprise a closed'heating circuit to be traversed by the greater portion of the air circulating in the spinning cells, a branch condensing circuit, a subebranch leading from the delivery side of the condenser to a vapor absorption or recovery plant, and control means for said circuit, branch circuit and sub-branch.
  • Said closed circuit through the spinning cells may be constituted by a large collector for the vapor "laden air issuing from the cells, a fan for imparting motion to the air, a tubular heater in which the air is raised to a temperature of about 100 .C., and a distributor for distributing the heated air back to the cells such air passing, if desired,.through small special heaters, one for each cell, whose function is to make good any'loss in temperature and to enable the air to be admitted into the several cells at the desired temperature.
  • said branch circuit which communicates with the closed circuit in advance of the tubular heater, may include a condenser cooled to the desired temperature either by water or by cold
  • a suitable valve arrangement any desired proportion of the total air circulation can be ,diverted into the branch circuit so as to modi y, at will, the proportion of vaporized solvent contained in the air returned to the cells.
  • Pipes may connect the absorption plant with suction slots located near the ports through which access is gained to the cells, so that when said ports are opened the suction slots are uncovered and solvent vapor which would otherwise escape through the opened ports are led to the absorption plant.
  • a heating jacket may be provided round the upper part of each cell, for the purpose of restoring the temperature of the air which has traversed the first part of the cell.
  • A denotes one of a series of cells constituting a spinning machine or group of such machines; B and C are respectively the inlet for the hot air to the cell and the outlet therefrom for the vapor laden air.
  • E and F are two butterfiy valves, which act simultaneously and serve to shut ofi' communication between the cell and the circulating system when the cell is to be opened for any reason.
  • G is a tubular collector receiving the saturated air aspirated by the different cells.
  • This tube is of large section because the loss of head sustained in passing therethrough has no appreciable influence on the negative pressures at the cell outlets C.
  • Said tube is in direct and immediate communication with a suction fan H, which is provided with a by-pass and valve H to regulate the effective draught of the fan.
  • the vapor laden air delivered by the fan passes, in part, directly into a heater K, and in part into a condenser I included in a branch circuit.
  • the amount of air passed through the condenser can be regulated at will by manipulating valves M, L and N.
  • This air after parting with a large proportion of the vaporized solvent in the condenser, is returned to the air in the primary circuit, in order to pass through a main heater K in that circuit. On issuing from the latter, the air is admitted into the distributor G whence it passes to separate heaters U and, from these, returns to the different cells by way of the valves F.
  • P is a controlled sub-branch for drawing off air from the branch circuit on the delivery side of the condenser I, and is in communication with a suction device and an absorption vessel W.
  • a suction device and an absorption vessel W.
  • pipes Z and Y which carry off any vapor-laden air which may escape from the port openings of the cells when the ports D are opened.
  • Equal distribution of hot air into each cell is effected by means of orifice plates T of suitable dimensions attached to the separate heaters U.
  • T and T are differential pressure gauges for measuring the air current to enable the determination of the total air circulation or the proportion of air obliged to pass through the condenser.
  • S is a gauge for ascertaining the amount of air drawn off from the circuit, to which corresponds a similar volume of air entering the cells through the discharge orifices for the threads.
  • the solvent condensed in the condenser I is passed by way of a siphon Q through a meter R which records the amount of solvent recovered by condensation.
  • V is an auxiliary heater, one for each cell, traversed by water at a temperature of about C.
  • an apparatus including a cell for spinning cellulose esters dissolved in volatile solvents, a normally open circuit through which vaporladen air may be withdrawn from said cell and returned thereto, a branch-condensing circuit, said branch-condensing circuit being normally open, whereby vapor-laden air may simultaneously pass through both circuits, means in said branch-condensing circuit for regulating the amount of vapor-laden air circulating therethrough, a vapor recovery plant, and a branch leading from the delivery side of the branchcondensing circuit to the vapor recovery plant.
  • a normally open circuit through which vapor-laden air may be withdrawn from said cells and returned thereto, including a collector for the vapor-laden air issuing from the cells and a distributor for distributing the air back to the cells, means for imparting motion to the air in said circuit, a heater for raising the temperature of the air as it passes through a part of said circuit, a branch-condensing circuit, said branch-condensing circuit being normally open, whereby vapor-laden air may simultaneously pass through both circuits, means in said branch-condensing circuit for regulating the amount of vapor-laden air circulating therethrough, a vapor recovery plant and a branch leading from the delivery side of the branch-condensing circuit to the vapor recovery plant.
  • an air circulating system comprising a closed heating circuit in communication with the cells, a branch condensing circuit, a sub-branch leading from the delivery side of the branch condensing circuit to vapor recovery plant, pipes connecting the port orifices of the cells with the sub-branch, and control means for said heating circuit, condensing circuit and subbranch for the purpose specified.
  • a plurality of spinning cells a closed heating circuit in communication with the cells, a branch condensing circuit both ends of which are in connection with said heating circuit, a vapor recovery means, a subbranch leading from the delivery side of the branch condensing circuit to said vapor recovery means, and means for independently controlling said heating circuit, the vapor content of the air in the condensing circuit, and the sub-branch.
  • an air circulating system comprising a closed heating circuit in communication with the cells, a branch condensing circuit both ends of which are in connection with the heating circuit in advance of the heating element, a sub branch leading from the delivery side of the branch condensing circuit to a vapor recovery plant, and independent control means for said heating circuit, for the branch condensing circuit and for the sub-branch.
  • an air circulating system comprising a closed circuit through the cells, a fan included in the closed circuit, heating means in the closed circuit, a branch condensing circuit both ends of which communicate with the closed circuit in advance of the heating means therein, a sub-branch leading from the delivery side of the branch condensing circuit to a vapor recovery plant; and separate control means for said closed circuit, for the branch condensing circuit, and for the sub-branch.
  • an air circulating system comprising a closed circuit including the cells, a fan included in the closed circuit, a valve-controlled by-pass for the fan, heating means in the closed circuit, a branch condensing circuit both ends of which communicate with the said closed circuit in advance of the heating means therein, a vapor recovery plant, a sub-branch leading from the delivery side of the branch condensing circuit to said vapor recovery plant; and separate control means for said closed circuit, for the vapor content of the air in the condensing circuit, and for the sub-branch.
  • a spinning cell means for continuously withdrawing air laden with solvent vapors, means for separating the solvent vapors from such air, means for heating the separated air, and means for returning such air to the cell; all operating in a closed circuit.
  • a spinning cell means for continuously withdrawing air laden with solvent vapors, means for separating the solvent vapors from such air, means for heating the separated air, and means for returning such air to the cell, all operating in a closed circuit; and means whereby the proportion of vaporized solvent present in the atmosphere in the cell can be regulated.
  • a spinning cell means for continuously withdrawing air ladenwith solvent vapors, means for separating the solvent vapors from such air, means for heating the separated air, and means for returning such air to the cell, all operating in a closed circuit; and separate means whereby the ratio of air free from solvent vapor, of air not free from solvent vapors, and of the proportion of vaporized solvent present in the atmosphere of the cell, can be regulated.
  • an air circulating system comprising a closed circuit including the cells, a fan included in said closed circuit, heating means in said closed circuit, and a Vapor condensing means exterior to said circuit but having its inlet and outlet connected with the said closed circuit between the cells and the heating means; and separate control means for said closed circuit, and the condensing means.
  • an air circulating system comprising a closed circuit including the cells, a fan included in said closed circuit, heating means in said closed circuit, a vapor condensing means exterior to said circuit but having its inlet and outlet connected with the said closed circuit between the cells and the heating means; an absorption vessel, a connection between the delivery side of the condensing means and said absorption vessel; and separate control means for said closed circuit, the condensing circuit, and the connection with the absorption vessel.
  • a process for controlling the evaporation of solvents in spinning rayon which comprises continuous removal from the spinning cell of air carrying solvent vapor, passing said air through a heater and back to the cell and passing a predetermined percentage of said solvent laden air through a solvent recovery apparatus before passing to the heater.
  • a process as set forth in claim 13 in which means is provided for regulating the percentage of solvent laden air passing through the solvent recovery apparatus.
  • Apparatus for dry spinning rayon including a spinning cell having an opening for access to the interior thereof, means normally closing said opening and a system connected to said cell through which air carrying solvent vapor is passed from the cell, and means for withdrawing solvent vapor from said opening and discharging it into said system adapted for operation when said opening is uncovered.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US271912A 1928-03-23 1928-04-21 Apparatus for spinning cellulose esters dissolved in volatile solvents Expired - Lifetime US1962605A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT308564X 1928-03-23

Publications (1)

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US1962605A true US1962605A (en) 1934-06-12

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US271912A Expired - Lifetime US1962605A (en) 1928-03-23 1928-04-21 Apparatus for spinning cellulose esters dissolved in volatile solvents

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US (1) US1962605A (enrdf_load_stackoverflow)
BE (1) BE353997A (enrdf_load_stackoverflow)
GB (1) GB308564A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2697251A (en) * 1951-02-07 1954-12-21 American Viscose Corp Method and apparatus for manufacturing artificial filaments

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2311484A (en) * 1996-03-27 1997-10-01 Viscofil Consolidated Corp Solvent recovery in dope spinning process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2697251A (en) * 1951-02-07 1954-12-21 American Viscose Corp Method and apparatus for manufacturing artificial filaments

Also Published As

Publication number Publication date
GB308564A (en) 1929-09-26
BE353997A (enrdf_load_stackoverflow)

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