US2792122A - Filtering device for use in the spinning of synthetic linear polymers - Google Patents

Filtering device for use in the spinning of synthetic linear polymers Download PDF

Info

Publication number
US2792122A
US2792122A US342698A US34269853A US2792122A US 2792122 A US2792122 A US 2792122A US 342698 A US342698 A US 342698A US 34269853 A US34269853 A US 34269853A US 2792122 A US2792122 A US 2792122A
Authority
US
United States
Prior art keywords
filter
spinning
plates
opposite faces
polymer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US342698A
Other languages
English (en)
Inventor
Munch Werner
Notarbartolo Luigi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Perfogit SpA
Original Assignee
Perfogit SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Perfogit SpA filed Critical Perfogit SpA
Application granted granted Critical
Publication of US2792122A publication Critical patent/US2792122A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • D01D1/00—Treatment of filament-forming or like material
    • D01D1/10—Filtering or de-aerating the spinning solution or melt
    • D01D1/106—Filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
    • B01D29/46—Edge filtering elements, i.e. using contiguous impervious surfaces of flat, stacked bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/18—Filters characterised by the openings or pores
    • B01D2201/184—Special form, dimension of the openings, pores of the filtering elements

Definitions

  • the invention relates to a filtering device to be employed in the spinning of synthetic linear polymers from the melt.
  • such spinning is efiected by extruding the molten polymer at a controlled rate through a suitable spinning nozzle. It is also known that it is necessary to place a suitable filter ahead of the spinning nozzle. Filters of various types are known such as filters consisting of stacks of nets having an increasing fine mesh towards the spinneret, or consisting of sand layers with a grain size that decreases in the same direction, with the sand being retained above the spinneret by nets.
  • the filters according to the present invention accomplish with complete efiiciency both the above tasks.
  • they comprise aseries of metal plates provided with through bores and grooves which, when the plates are juxtaposed define a plurality of narrow capillary channels which force the molten polymer to follow a sufficiently tortuous path in passing through said series of plates and which at the same time retain not only the solid impurities but also the gaseous bubbles, this being due-it is rbelievedto surface tension phenomena.
  • the metal plates should preferably be made of a material that may be washed each time the filter becomes exhausted whereby it may then be re-used. Since this Washing is conveniently effected by means of nitric acid, in particular when the polymer to be filtered is a polyamide, it is convenient to make the plates of stainless steel, for example nickel-chrome steels.
  • the dimensions of the bores and channels are naturally related to their shapes and to the characteristics of the polymer.
  • Fig. 1 is a cross-sectional view and partly an elevational view of a filter according to an embodiment
  • Fig. 2 is a plan view of an individual plate of the filter shown in Fig. 1;
  • Fig. 3 is a cross-sectional view of the plate shown in Fig. 2.
  • the numeral 10 denotes a casing which serves as a support for the filter to which the polymer is fed from conduit 18 and is provided with an outlet opening 13 for the filtered polymer.
  • Bolts 11 and 12 lock the superimposed plates tightly against ring 19, and opening 13' thereof defines the inlet opening for the polymer to be filtered.
  • the various plates are indicated by numeral 14, and one of the plates shown in Figs. 2 and 3.
  • the plates are provided .with through bores 15 having a diameter of about 0.20 to 0.5 mm. and about 5 to 7 mm. long. Bores 15 are arranged along several concentric circles, as it is clearly seen in Fig. 2. Corresponding to each circle, there is a preferably semi-circular or like groove 16 which connects the entrances or the exits of all the through bores that are located on the same circle.
  • the polymer which enters from conduit 18, after having passed through the bores 16 of the first plate, will have to flow along shorter or longer portions of the substantially circular capillary channels 17 defined by the grooves 16 of the lower face of the first plate and the corresponding grooves of the upper face of the second plate. Thereafter the polymer will cross the through bore of the second plate and so on.
  • the diameters of the through bores are not the same for all plates, but decrease towards the spinneret.
  • the plate adjacent the spinneret may have 0.20 mm. bores the immediately preceding plate 0.25 mm. bores and so on.
  • the number of the bores depends on the amount of polymer spun in a unit of time.
  • the dimensions of grooves 16 and therefore of channels 17 may also decrease in a like manner towards the spinneret.
  • a filter of this type is perfectly effective for retaining both the impurities and the gaseous bubbles.
  • Another advantage of this filter is that it is made of a material that is a good heat conductor and that may be heated by conduction and that at any rate is excellently adapted to keep the temperature of the polymer and therefore the spinning viscosity at the desired level. This makes it possible to avoid the excessively severe thermal treatments which were necessary to bring the polymer to such a temperature as to cause it to reach the spinneret while still having the required fluidity even after passing through filters made of insulating materials.
  • Spinning filter for use in the spinning of synthetic linear polymers from the melt, comprising a casing having an inlet opening for the liquid polymer to be filtered and an outlet opening for the filtered liquid polymer, the centers of said inlet and outlet openings defining a general axis of the filter, a plurality of metal plates having each a cylindrical peripheral surface and two plane parallel opposite faces, said plates being assembled within said casing coaxilly with and perpendicularly to said general axis of the filter and with their parallel opposite faces in juxtaposed contacting relationship, said parallel opposite faces being sufiiciently smooth to effect a seal against the liquid polymer when in contact with one another, said plates being further provided with through bore disposed along concentric circles centered about said general axis of the filter and having circular grooves on their parallel opposite faces, each groove connecting the openings of those of said through bores being disposed on the same one of said concentric circles, and locking means tightly holding said plates within said casing in the aforementioned assembled relationship the through bores of adjacent plates being staggered 3

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US342698A 1952-03-28 1953-03-16 Filtering device for use in the spinning of synthetic linear polymers Expired - Lifetime US2792122A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT735788X 1952-03-28

Publications (1)

Publication Number Publication Date
US2792122A true US2792122A (en) 1957-05-14

Family

ID=11315330

Family Applications (1)

Application Number Title Priority Date Filing Date
US342698A Expired - Lifetime US2792122A (en) 1952-03-28 1953-03-16 Filtering device for use in the spinning of synthetic linear polymers

Country Status (4)

Country Link
US (1) US2792122A (cs)
FR (1) FR1072897A (cs)
GB (1) GB735788A (cs)
NL (2) NL177215B (cs)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2923970A (en) * 1960-02-09 genovese
US2999274A (en) * 1958-04-14 1961-09-12 Phillips Petroleum Co Dispersing solid additives in plastics
US3050774A (en) * 1957-09-03 1962-08-28 Du Pont Spinneret assembly
US3245113A (en) * 1963-06-10 1966-04-12 American Cyanamid Co Apparatus for forming multi-component fibers
US3320633A (en) * 1965-08-25 1967-05-23 Du Pont Apparatus for forming two component yarns
US3407437A (en) * 1965-07-15 1968-10-29 Barmag Barmer Maschf Spinning head for high pressure melt spinning
US3516119A (en) * 1967-05-22 1970-06-23 Vickers Zimmer Ag Spinning device
US3737036A (en) * 1970-08-26 1973-06-05 Bendix Corp Filter for polymer processing and method of manufacture
FR2345286A1 (fr) * 1976-03-24 1977-10-21 Gellert Jobst Filtre de moulage par injection
US4061462A (en) * 1974-06-17 1977-12-06 Montedison S.P.A. Apparatus for extruding thermoplastic material
US4728502A (en) * 1984-05-02 1988-03-01 Hamill Brendan J Apparatus for the chemical synthesis of oligonucleotides
US4918807A (en) * 1988-10-19 1990-04-24 A. Ahlstrom Corporation Screen and method of manufacture
DE19643425C2 (de) * 1996-10-22 1999-12-02 Geb Schroeder Beeck Sandlose Spinndüse
US6033609A (en) * 1997-10-28 2000-03-07 Basf Corporation Device and method to prevent spinneret hole contamination
US20220203272A1 (en) * 2020-12-29 2022-06-30 Metal Industries Research & Development Centre Tangential flow filtration module and tangential flow filtration assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2971219A (en) * 1956-08-14 1961-02-14 Du Pont Mixer distribution plate

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE257144C (cs) *
US1262317A (en) * 1917-11-12 1918-04-09 John H V Finney Carbureter attachment.
US1456438A (en) * 1922-07-28 1923-05-22 Hesselman Knut Jonas Elias Liquid filter
FR666474A (fr) * 1928-12-28 1929-10-02 Régulateur-filtre pour carburateur d'automobile
GB324034A (en) * 1928-10-13 1930-01-13 Albert Schrempp Improved filter device
US1788412A (en) * 1922-01-24 1931-01-13 Sperry Dev Co Oil engine
US1983330A (en) * 1928-07-06 1934-12-04 Celanese Corp Manufacture of artificial filaments, threads, films, or the like
US2266363A (en) * 1938-11-10 1941-12-16 Du Pont Apparatus for the production of filaments
US2266368A (en) * 1938-11-10 1941-12-16 Du Pont Apparatus for the production of artificial structures
US2284787A (en) * 1938-04-08 1942-06-02 Winkler Jack Filter
US2345014A (en) * 1941-10-20 1944-03-28 Stamsvik Mfg Corp Filtration unit
US2449809A (en) * 1939-01-12 1948-09-21 Johnson & Johnson Corrugated disk filter
US2507355A (en) * 1946-01-17 1950-05-09 Sola Giuseppe Filter for injectors for combustion engines

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE257144C (cs) *
US1262317A (en) * 1917-11-12 1918-04-09 John H V Finney Carbureter attachment.
US1788412A (en) * 1922-01-24 1931-01-13 Sperry Dev Co Oil engine
US1456438A (en) * 1922-07-28 1923-05-22 Hesselman Knut Jonas Elias Liquid filter
US1983330A (en) * 1928-07-06 1934-12-04 Celanese Corp Manufacture of artificial filaments, threads, films, or the like
GB324034A (en) * 1928-10-13 1930-01-13 Albert Schrempp Improved filter device
FR666474A (fr) * 1928-12-28 1929-10-02 Régulateur-filtre pour carburateur d'automobile
US2284787A (en) * 1938-04-08 1942-06-02 Winkler Jack Filter
US2266363A (en) * 1938-11-10 1941-12-16 Du Pont Apparatus for the production of filaments
US2266368A (en) * 1938-11-10 1941-12-16 Du Pont Apparatus for the production of artificial structures
US2449809A (en) * 1939-01-12 1948-09-21 Johnson & Johnson Corrugated disk filter
US2345014A (en) * 1941-10-20 1944-03-28 Stamsvik Mfg Corp Filtration unit
US2507355A (en) * 1946-01-17 1950-05-09 Sola Giuseppe Filter for injectors for combustion engines

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2923970A (en) * 1960-02-09 genovese
US3050774A (en) * 1957-09-03 1962-08-28 Du Pont Spinneret assembly
US2999274A (en) * 1958-04-14 1961-09-12 Phillips Petroleum Co Dispersing solid additives in plastics
US3245113A (en) * 1963-06-10 1966-04-12 American Cyanamid Co Apparatus for forming multi-component fibers
US3407437A (en) * 1965-07-15 1968-10-29 Barmag Barmer Maschf Spinning head for high pressure melt spinning
US3320633A (en) * 1965-08-25 1967-05-23 Du Pont Apparatus for forming two component yarns
US3516119A (en) * 1967-05-22 1970-06-23 Vickers Zimmer Ag Spinning device
US3737036A (en) * 1970-08-26 1973-06-05 Bendix Corp Filter for polymer processing and method of manufacture
US4061462A (en) * 1974-06-17 1977-12-06 Montedison S.P.A. Apparatus for extruding thermoplastic material
FR2345286A1 (fr) * 1976-03-24 1977-10-21 Gellert Jobst Filtre de moulage par injection
US4728502A (en) * 1984-05-02 1988-03-01 Hamill Brendan J Apparatus for the chemical synthesis of oligonucleotides
US4918807A (en) * 1988-10-19 1990-04-24 A. Ahlstrom Corporation Screen and method of manufacture
DE19643425C2 (de) * 1996-10-22 1999-12-02 Geb Schroeder Beeck Sandlose Spinndüse
US6033609A (en) * 1997-10-28 2000-03-07 Basf Corporation Device and method to prevent spinneret hole contamination
US20220203272A1 (en) * 2020-12-29 2022-06-30 Metal Industries Research & Development Centre Tangential flow filtration module and tangential flow filtration assembly
US11684874B2 (en) * 2020-12-29 2023-06-27 Metal Industries Research & Development Centre Tangential flow filtration module and tangential flow filtration assembly

Also Published As

Publication number Publication date
GB735788A (en) 1955-08-31
FR1072897A (fr) 1954-09-16
NL177215B (nl)
NL96182C (cs)

Similar Documents

Publication Publication Date Title
US2792122A (en) Filtering device for use in the spinning of synthetic linear polymers
US3702659A (en) Filter cores
US3469279A (en) Spinneret for heterofilaments
US3692423A (en) Apparatus for spinning synthetic {37 islands-in-a-sea{38 {0 type composite filaments
US3613170A (en) Spinning apparatus for sheath-core bicomponent fibers
US3466703A (en) Spinneret assembly
US3006028A (en) Spinning apparatus
US3516478A (en) Apparatus for separation of impurities from metal melts in a filament spinning device
US2266368A (en) Apparatus for the production of artificial structures
JPS5837406B2 (ja) ２成分フイラメントの紡糸組立物
IL43405A (en) Enclosed filtering units for liquids or gases
US3095607A (en) Spinneret assembly
US3847524A (en) Spinnerette head assembly with porous metal filter and shear element
US3259938A (en) Spinneret pack
US3225383A (en) Spinneret distribution plate
US3353211A (en) Spinneret assembly
US2904828A (en) Spinneret filter pack
ES337232A1 (es) Un aparato para hilar un hilo de filamentos multiples.
US4276011A (en) Spinnerette assembly
US3262153A (en) Apparatus for producing composite filaments
US3634576A (en) Spinneret unit and method for the spinning of chemical filaments
GB1019052A (en) Apparatus for spinning composite filaments
ES299794A1 (es) Procedimiento para la producción de un filamento termoplástico trilobulado
US3475527A (en) Process for destroying melt crystalline order in fiber-forming polymers
US4317790A (en) Spinning process