US3017789A - Spinneret production - Google Patents

Spinneret production Download PDF

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Publication number
US3017789A
US3017789A US776585A US77658558A US3017789A US 3017789 A US3017789 A US 3017789A US 776585 A US776585 A US 776585A US 77658558 A US77658558 A US 77658558A US 3017789 A US3017789 A US 3017789A
Authority
US
United States
Prior art keywords
hole
blank
orifice
punch
spinneret
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
US776585A
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English (en)
Inventor
James S Cobb
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to US776585A priority Critical patent/US3017789A/en
Application granted granted Critical
Publication of US3017789A publication Critical patent/US3017789A/en
Priority to BE614482A priority patent/BE614482Q/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D01D4/02—Spinnerettes
    • D01D4/022—Processes or materials for the preparation of spinnerettes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/02—Stabbing or piercing, e.g. for making sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K23/00—Making other articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/16—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass plates with holes of very small diameter, e.g. for spinning or burner nozzles

Definitions

  • This invention relates generally to the extrusion of viscous organic materials and, more particularly, to the fabrication of a spinneret adapted for use in the spinning of synthetic filaments.
  • the most important object of the present invention is to present a method of fabricating spinneret holes having optimum flow characteristics.
  • Another object of the invention is the fabrication of slotted and other iregularly shaped holes by a method in which stamping and punching steps alone are involved and in which no drilling or broaching, as such, is necessary.
  • the presently disclosed method comprises generally the steps of recessing a blank, stamping into the recess with a wedge-shaped punch tapered in the direction of its advance, removing the deformation or protuberance left on the face of the spinneret blank, and surface punching with a straight punch.
  • the resulting hole is tapered through the major portion of its length and terminates in straight-walled portions and a precisely formed orifice.
  • FIGURE 1 is an enlarged fragmentary perspective sec tion of a spinneret blank which has been stamped in accordance with the teachings of the present invention
  • FIG. 2 is a sectional view similar to that shown in FIG. 1 after the excess punched-out material has been removed from the spinneret face;
  • FIG. 3 illustrates the manner in which the hole of FIG. 2 is sized and finished with a straight punch
  • FIG. 4 is an enlarged fragmentary perspective section taken through the counterbore and finished hole of a spinneret made according to the invention.
  • FIG. 5 shows the wedge-shaped punch used in starting the hole, as shown in FIG. 1.
  • the numeral designates the flat bottom of a counterbore which has been formed as by drilling, in a spinneret blank 12 as the first step in the preparation of a hole 14.
  • the blank 12 is counterbored to within about 0.012 inch from the spinneret face.
  • each is stamped, using the tool illustrated in FIG. 5, to start the hole 14.
  • a soft metal back-up plate 16 is positioned between the blank 12 and the punch plate and prevents tearing out of the excess material or protuberance left on the face of the spinneret. It should be noted that the partially prepared hole 14 extends beyond the lower face 18 of the blank 12.
  • the next step in the production of the spinneret is to remove the excess material 15 from the lower face 18, by sanding or grinding, so as to present an undersized orifice 20, as shown in FIG. 2..
  • FIG. 3 The next and final step is illustrated in FIG. 3 wherein it is seen that a straight punch 22 having the dimensions of the finished orifice is used to size and finish the hole.
  • the blank 12 is punched from the face 18 whereas the stamping step is made through the counterbore 10.
  • a finished hole is illustrated in FIG. 4, together with the counterbore which was formed initially to leave the thickness in which the hole is fabricated.
  • the hole has straight wall sections 24 which result from the use of the surface punch 22 and which extend to tapered wall portions 2s.
  • the hole merges with the bottom 10 of the counterbore in a rounded edge 28 which has a radius of about 0.012 inch and is formed as a result of the natural How of the spinneret metal during the stamping step.
  • the finished hole also has angularly disposed 'end walls 30 which, along with wall portions 26, conform generally to the wedge shape of a punch 32.
  • the tapered wedge-shaped punch 32 as illustrated in FIG. 5, has an included angle equal to the desired angular dimensions of the hole and a rectangularly shaped tip 34 having dimensions substantially equal to those of the unfinished orifice 20 illustrated in FIG. 2.
  • the included angle of the tapered punch, between the ends as well as the sides, should be between 20 and 40 since it has been found that, with an angle of less than 20, the punch breaks readily and, with an angle of over 40, an undesirable amount of material is punched through the blank, leaving an oversize orifice. An angle of about 30 is preferred.
  • the blank '12 is first counterbored, as indicated by the numeral 10, and then positioned on the soft metal back-up plate 16.
  • the remaining thickness of the blank is stamped with a tapered punch of the configuration shown in FIG. 5, removed from the die, and polished to remove the protuberance 15 raised on the spinneret face by the punch 32.
  • the unfinished hole is as illustrated in FIG. 2.
  • the straight punch 22 shown in FIG. 3 is used from the face 18 of the spinneret to size the orifice and to form the straight wall portions 24, the height of each of which is approximately equal to the width of the finished orifice.
  • a straight-walled, smooth hole is formed by the cutting action of the surface punch 22 in the tapered sec-tion previously formed by the stamping punch. In this finishing step, no burr formation results when the surface punch breaks out into the tapered section.
  • various shapes of punches may be used such as Y, cruciform, hexiform, and the like.
  • the slot or slots of the configuration chosen have a length to width ratio of between 2:1 and 20:1, with the slot width being in the neighborhood of 0.002 inch.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Punching Or Piercing (AREA)
US776585A 1958-11-26 1958-11-26 Spinneret production Expired - Lifetime US3017789A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US776585A US3017789A (en) 1958-11-26 1958-11-26 Spinneret production
BE614482A BE614482Q (fr) 1958-11-26 1962-02-27 Procédé de fabrication de filières

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US776585A US3017789A (en) 1958-11-26 1958-11-26 Spinneret production

Publications (1)

Publication Number Publication Date
US3017789A true US3017789A (en) 1962-01-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US776585A Expired - Lifetime US3017789A (en) 1958-11-26 1958-11-26 Spinneret production

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US (1) US3017789A (fr)
BE (1) BE614482Q (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141358A (en) * 1962-05-09 1964-07-21 Du Pont Method for forming spinning orifices in spinneret plate structures
US3187607A (en) * 1962-07-24 1965-06-08 Du Pont Spinneret production
US3362265A (en) * 1966-04-28 1968-01-09 Du Pont Method of making spinnerettes
US3668948A (en) * 1971-03-16 1972-06-13 Du Pont Method
US3766619A (en) * 1969-11-25 1973-10-23 Sharon Mf Co Compressor valve assembly and method of producing the same
US3834251A (en) * 1973-02-27 1974-09-10 Du Pont Method
US6145365A (en) * 1997-09-29 2000-11-14 Nakamura Seisakusho Kabushikigaisha Method for forming a recess portion on a metal plate
US20040129051A1 (en) * 2002-07-30 2004-07-08 Seiko Epson Corporation Method of punching small hole and method of manufacturing liquid ejection head using the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148221A (en) * 1935-10-07 1939-02-21 North American Rayon Corp Spinnerette manufacturing apparatus
US2211946A (en) * 1938-05-12 1940-08-20 Du Pont Spinnerette
US2341555A (en) * 1939-01-05 1944-02-15 Baker & Co Inc Extrusion device
US2618989A (en) * 1948-06-01 1952-11-25 John A Cupler Method of manufacturing orificed members
US2742667A (en) * 1951-11-08 1956-04-24 Rhodiaceta Spinnerets

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148221A (en) * 1935-10-07 1939-02-21 North American Rayon Corp Spinnerette manufacturing apparatus
US2211946A (en) * 1938-05-12 1940-08-20 Du Pont Spinnerette
US2341555A (en) * 1939-01-05 1944-02-15 Baker & Co Inc Extrusion device
US2618989A (en) * 1948-06-01 1952-11-25 John A Cupler Method of manufacturing orificed members
US2742667A (en) * 1951-11-08 1956-04-24 Rhodiaceta Spinnerets

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141358A (en) * 1962-05-09 1964-07-21 Du Pont Method for forming spinning orifices in spinneret plate structures
US3187607A (en) * 1962-07-24 1965-06-08 Du Pont Spinneret production
US3362265A (en) * 1966-04-28 1968-01-09 Du Pont Method of making spinnerettes
US3766619A (en) * 1969-11-25 1973-10-23 Sharon Mf Co Compressor valve assembly and method of producing the same
US3668948A (en) * 1971-03-16 1972-06-13 Du Pont Method
US3834251A (en) * 1973-02-27 1974-09-10 Du Pont Method
US6145365A (en) * 1997-09-29 2000-11-14 Nakamura Seisakusho Kabushikigaisha Method for forming a recess portion on a metal plate
US20040129051A1 (en) * 2002-07-30 2004-07-08 Seiko Epson Corporation Method of punching small hole and method of manufacturing liquid ejection head using the same
US6968723B2 (en) * 2002-07-30 2005-11-29 Seiko Epson Corporation Method of punching small hole and method of manufacturing liquid ejection head using the same

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Publication number Publication date
BE614482Q (fr) 1962-06-18

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