Classifications

• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
  • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
• • 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
  • D01D4/00—Spinnerette packs; Cleaning thereof
  • D01D4/02—Spinnerettes
  • D01D4/022—Processes or materials for the preparation of spinnerettes

Definitions

• This invention relates to the production of stainless steelspinning jets, such as those employed in apparatus. for spinning artificial filamentary'materials; and relates more partic ularly to an improved process for-the production of said "jets wherebythe latter may be produced rapidly ,and'efilciently.
• An object of this invention is the provision of an improvedprocess .for the production of stainless steel spinning jets provided with aplurali'ty of fine orificesand employed for the preparation of artificial. filaments by extrusion operations.
• Another objectof "this invention isto provide an improved process for the production of stainless vsteel spinning jets whereby asmooth finish and high: polish may be imparted lto all surfaces of said spinning jets includingthe innersurfaces of 'said orifices without the use of ulling or other mechanical polishingaids;
• the processesuemployedffor forming artificial filaments comprise extruding a filament-forming material under pressure through the orifices of a spinning jet, usually formed of metal, such as stainless steel, into. a setting medium, the number of filaments formed corresponding to the number of holes in the jet.
• the filaments thus formed which may number from '20 to 120, or more, are then gathered to form a yarnanzd the yarn collected on a bobbin orother suitable support to form a yarn package.- Asidefro-m the attenuating effect produced by stretching the filaments asthey are formed, the denier-or fineness of the individual filaments is largely controlled by the diameter of the orifices in the spinning jet through which the filament-forming material is extruded. The finerthe denier of the individual filaments, thesofter and more pliable is the yarn.
• solution of animorganic;electrolyte.- The cathode employed dur ingrsaid. treatment preferably comprises stain? less .steel but other suitable metals may also be employed.
• the position of the .jet is changed intermittentlyduring the 816C? trolytictreatment.
• Themotion imparted to the jet comprises rotating the jet intermittently about its vertical axis 'whilethejet is maintained int-.theasameplane. This intermittent turning avoids undue and uneven attacker the metal at the .minute edges of. the holes which causes an undesirable rounding .of the edges.
• a single rotation through ian angle .of.18.0 is-satisfactory although the .jet maybe rotated several times dfuringgthe polishing operation through a lesser angle, says-45 or for example, to efiect anet rotation of 180 so that amoreuniiorm and satisfactorypolishing isachieveds
• a smooth, highly polished finish .or surface free of abrasion .lines, even under microscopic examination. is imparted toall. the areas .of .said jets, including the orifices, and, by suitably extending the period'ofsaid electrolytic treatment, the diameter of the orifices provided therein may be enlarged to any predetermined size.
• an electrolyte comprising orthophosphoric acid hav ing dissolved therein a soluble aliphatic polyhydroxy alcohol of low volatility containing one or more free hydroxy groups.
• aliphatic hydroxy compounds of low volatility which may be employed are glycerine, ethylene glycol, diethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene gly col monomethyl ether, diethylene glycol monoethyl ether and diethylene glycol monobutyl ether.
• the phosphoric acid solution employed in effecting the electrolytic treatment comprises a mixture of ortho-phosphoric acid and glycerine containing from 40 to 50% by volume of 85% ortho-phosphoric acid and from 50 to 60% by volume of glycerine.
• the temperature of the electrolyte during the electrolytic treatment of the stainless steel spinning jets is most advantageously maintained above about 40 C. and may be as high as 125 C., or more. ever when the temperature of the electrolytic bath is at about 80 C. during the treatment of the stainless steel spinning jets.
• a voltage of 15 to 20 volts is usually sufficient in order to maintain the desired current density which is preferably at from about 0.1 to 2.0 amperes per square inch.
• a current density of about 1.5 amperes per square inch is most satisfactory.
• Example A spinning jet blank formed of 18/8 stainless steel is countersunk on the inner face thereof at a plurality of points correspondingto the positions at which the jet holes are to be drilled.
• the countersunk spinning jet is then placedin an electrolytic bath consisting of 50 parts by volume of glycerirle dissolved in 50 parts by volume of 85% ortho-phosphoric acid maintained at a temperature of 80 C.
• a stainless steel cathode having about five times th area of the spinning jet is placed in the bath and connected to the spinning jet through anelectrical circuit of which the jet forms the anode.
• the voltage of the circuit is held to about 15 volts and the current density maintained at about 1.5 amperes per square inch of anode. The current is allowed to flow for 20 minutes to effect the desired anodic action so that any burr present is removed.
• the jet is withdrawn from the electrolytic bath, the jet holes drilled and the gross burr formed is sub stantially buffed 01f.
• the drill is passed through the hole again.
• the drilled jet is then again subjected to the anodic electrolytic treatment employing the same voltage and current density.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Priority Applications (5)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24673147

Family Applications (1)

Country Status (5)

Cited By (3)

Citations (4)

• 0
  • BE BE475900D patent/BE475900A/xx unknown
  • FR FR954513D patent/FR954513A/fr not_active Expired
• 1946
  • 1946-04-30 US US666181A patent/US2496299A/en not_active Expired - Lifetime
• 1947
  • 1947-04-23 GB GB10885/47A patent/GB631205A/en not_active Expired
• 1948
  • 1948-10-02 DE DEP9585A patent/DE807741C/de not_active Expired

Patent Citations (4)

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