US3891379A - Spinning head with an exchangeable, self-sealing nozzle assembly - Google Patents

Spinning head with an exchangeable, self-sealing nozzle assembly Download PDF

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Publication number
US3891379A
US3891379A US401540A US40154073A US3891379A US 3891379 A US3891379 A US 3891379A US 401540 A US401540 A US 401540A US 40154073 A US40154073 A US 40154073A US 3891379 A US3891379 A US 3891379A
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United States
Prior art keywords
spinning head
nozzle assembly
casing
spinning
melt
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Expired - Lifetime
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US401540A
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English (en)
Inventor
Erich Lenk
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Oerlikon Barmag AG
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Barmag Barmer Maschinenfabrik AG
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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
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D01D4/08—Supporting spinnerettes or other parts of spinnerette packs

Definitions

  • the nozzle assembly is releasably connected to the stationary melt-supplying member with the aid of longitudinally extending cooperating guideways on this feed member and on the casing of the nozzle assembly, re spectively, and these guideways are so disposed that the melt pressure sets up substantially only tensional stresses in the melt casing.
  • the invention relates to spinning heads for the spinning of thermoplastic polymers, and more particularly to such spinning heads which permit easy removal of the nozzle assembly proper for the purpose of cleaning or replacement.
  • the invention also relates to multi-unit spinning head apparatus of this general kind.
  • Spinning heads are known wherein the nozzle assembly may be withdrawn and inserted in an axial direc tion, usually from the lower end of the spinning head.
  • Representative of this hanging type of construction are German published patent application No. 1,660,375 and German Pat. No. 1,246,221, for example.
  • clamping means in the form of vertically extending bolts or threaded clamping rings are provided by which the nozzle assembly is pressed upwardly against the member through which the melt is supplied to the top of the nozzle assembly.
  • the pressure thus mechanically exerted on the various seals which keep the melt from leaking to the outside of the nozzle assembly is supplemented by the melt pressure itself which in these designs tends to urge the different parts of the nozzle assembly away from each other and against the seals.
  • these parts include an annular piston designed to step up the pressure applied by the melt to the principal seal.
  • Spinning heads of this known construction have the disadvantage that vertical space must be set aside underneath the spinning head for the removal of the nozzle assembly. Also, since in arrangements of this kind the spinning chute is typically located in this general dismounting area, the chute interferes with the withdrawal and insertion operation and must be made of movable design. In the case of multi-unit spinning head apparatus, moreover, it becomes impossible during the exchange of one of the nozzle assemblies to continue operation with one of the other nozzle assemblies. In addition, the forces involved in sealing the nozzle assembly and securing it to the stationary feed member are large and their distribution is disadvantageous so that the resulting design is relatively bulky.
  • Spinning heads have been proposed in which the above mentioned disadvantage of lost space under neath the nozzle assembly is avoided by making this assembly removable in a lateral direction, i.e., in a direction generally perpendicular to the axis of the spinning head.
  • the stationary feed memher at its lower extremity is generally in the shape of a C which is open towards the service side of the spinning head.
  • the bottom leg of this C forms a ledge by which the nozzle assembly is supported and on which the nozzle assembly can be moved outwardly or inwardly in drawer-like fashion.
  • German published patent application No. 1,276,861 the foregoing construction is implemented by means of wedges which are supported by the afore mentioned bottom leg of the C-shaped stationary member and which cooperate with inclined, downwardly facing surfaces on the nozzle assembly.
  • the wedges can be drawn against the rear wall of the C by means of bolts and, as a result, the nozzle assembly is pressed against a seal at its top, thereby to seal the nozzle assembly at the point of melt supply.
  • the foregoing objects are obtained, briefly, by providing on the stationary feed member and on the casing member forming the holding element of the nozzle assembly, elongated cooperating guideways formed for instance by guide bars of generally rectangular cross section so that this casing with the spinning elements therein may be laterally withdrawn from and inserted in the spinning head.
  • the aforementioned guideways are disposed so that the self-sealing forces which are due to the action of the melt pressure substantially set up, in a direction parallel to the axis of the spinning head, merely tensional stresses in the above casing.
  • one of the two members thus releasably secured together has formed therein adjacent its guide bars, guide grooves in which the guide bars of the other member slide.
  • the mating faces of the guideways may be plane or they may be of dove-tail design.
  • the casing may also contain a piston with a passage therein for the melt and a resilient or deformable sealing element such as an annular diaphragm cooperating with the piston to facilitate self-sealing under the action of the melt pressure.
  • the nozzle assembly can be moved from the service side of the spinning head in drawer'like fashion, and because of this transverse direction of movement of the nozzle assembly, the latter can be exchanged simply and quickly.
  • the melt pressure is utilized both for selfsealing and for providing the clamping forces between the nozzle assembly and the feed member carrying this assembly, effective directly by way of the aforementioned guideways. In this fashion a force distribution is obtained which involves loops of lines of force closed over the cooperating parts of the guideways, the lengthwise extent of the casing. and a support provided adjacent its lower end. Because of the tensional nature of the stresses set up in the casing only thin walls are required for the latter, thereby reducing the space occupied by the casing.
  • the dimensions of the spinning head itself can be similarly reduced and this in turn reduces the space requirements of the heat box surrounding it. Also, because of the reduced dimensions of the casing of the nozzle assembly, visibility of the spinning assembly from the service side and accessibility in cleaning its parts are greatly enhanced.
  • the plurality of nozzle assemblies disposed one behind the other in the direction of insertion may be associated with a common member carrying them, in drawer-like fashion, by means of guideways of the kind mentioned.
  • a plurality of nozzle assemblies disposed side by side with respect to the direction of insertion may be so associated with a common carrying member.
  • FIG. 1 is a part-sectional front view of a spinning head according to the invention, including meltsupplying member, metering pump, heat box, and an exchangeable nozzle assembly;
  • FIG. 2 schematically illustrates a multi-unit spinning head apparatus according to the invention in which a plurality of nozzle assemblies are arranged side by side;
  • FIG. 3 schematically illustrates a multi-unit spinning head apparatus according to the invention in which a plurality of nozzle assemblies are arranged one behind the other;
  • FIG. 4 is a plan view of a casing, taken by itself, of the nozzle assembly of the spinning head as in FIG. 1.
  • FIGS. 5 and 6 are sectional front views of two other alternative embodiments of the invention.
  • the spinning head illustrated in this figure substantially comprises a stationary feed member 2 having a vertical passage 25 therein through which the melt is fed under the control of metering pump 17.
  • Reference numeral 9 denotes the side walls of a heat box enclosing the spinning head.
  • Feed member 2 carries a nozzle assembly 1 having a generally cube-shaped, thin-walled retaining or casing member 3 shown in plan view in FIG. 4.
  • casing 3 has a cylindrical cavity or well 19 therein which is open at the front and rear as viewed in FIG. 1, and also has a cylindrical meltdischarge opening 20 at the bottom, which is defined by the inner wall of supporting flange 10 of easing 3.
  • spinning elements including a cylindrical die plate 4 having spinning orflces or nozzles 21 therein, a likewise cylindrical filter element 8 associated with this die plate. and a cylindrical piston 5 having a central bore 22 aligned with feed member passage 25.
  • a disc-shaped metallic member or diaphragm 6 Abutting the bottom face of the piston, in sealing or connected relationship such by heat deformation or by welding, is a disc-shaped metallic member or diaphragm 6 which is similarly sealed at its periphery to that of filter 8. Diaphragm 6 has a central aperture therethrough.
  • a gasket or sealing means 7 On its top side piston 5 is provided with a gasket or sealing means 7 designed to form a seal with respect to the bottom face ofa lower extension 23 of feed member 2. Another gasket 7 is preferably inserted between flange l0 and plate 4.
  • This extension 23 has a depth that is a front-torear extent not visible in FIG. 1 which corresponds to that of easing 3, and it has the shape of an inverted T.
  • the horizontal legs 24, 24' of this T are of rectangular cross section and form ledges or guide bars for the sliding movement of the nozzle assembly in the withdrawal and insertion of the latter, and they leave above them corresponding rectangular guide grooves 12 and 12 which mate, respectively, with inwardly extending guide bars 11 and 11 of rectangular cross section which are formed at the top end of casing 3.
  • the guide bars l1, l1 and 24, 24' form guideways which serve to mechanically couple nozzle assembly 1 to feed member 2 in the operating condition of the spinning head while, at the same time, affording means for the withdrawal of nozzle assembly 1 from and its insertion into the spinning head from the service end (the front end of FIG. 1) of the spinning head in a direction normal to the axis of the latter in drawer-like fashion.
  • die plate 4, filter 8 and piston 5 with diaphragm 6 and sealing means 7 can be removed from casing 3 from the top end thereof for inspection, repair or replacement.
  • casing 3 is originally loaded, or is reloaded, with these parts from the top.
  • the melt pressure functions to provide an auotmatic seal both with respect to feed member 2 and casing member 3.
  • melt pressure operates to securely connect the nozzle assembly mechanically to the feed member and, in doing so, acts via legs or guide bars 24, 24' and l1, l1, and via flange 10 at the bottom end of easing 3, to set up in the wall of this casing substantially only tnesional stresses which extend in a direction parallel to the axis of the spinning head.
  • Feed member 2 and nozzle assembly I are thus locked together under the action of the melt pressure, by loops of lines of force which are closed over the aforementioned guideways, the axial or lengthwise extent of casing 3, and flange 10 in series. It is due to the tensional character of the stresses in casing 3 that its dimensions can be held to a minimum, and this in turn results in the improved properties of the design according to the invention from the standpoint of visibility and accessibility of the nozzle assembly. Also, no space for the dismounting of the nozzle assembly is lost therebelow.
  • FIG. 2 shows a multi-unit spinning head in which a plurality of nozzle assemblies the four assemblies, 13a, 13b, 13c, 13d in the example illustrated are carried and served by a common stationary feed member 14 having a corresponding number of melt passages (not shown). This common member is enclosed by a heat box 9'.
  • the nozzle assemblies are designed in particular, connected to the feed member and sealed in a manner explained above in conjunction with FIGS. 1 and 4.
  • the four nozzle assemblies are mounted in side-by-side relationship, that is, they are aligned in a direction perpendicular to that of withdrawal and insertion of the assemblies.
  • FIG. 3 illustrates a multi-unit spinning head in which a number of nozzle assemblies a, 15b, 15c, are similarly carried and served by a common stationary feed member 16.
  • the design of the nozzle assemblies and their connection to the feed member corresponds to the technique described hereinabove with respect to FIGS. 1 and 4.
  • the nozzle assemblies are aligned in this embodiment one behind the other, that is, in a direction parallel to the direction of withdrawal and insertion of the assemblies. This arrangement lends itself for installations in which two or three assemblies are to be so placed with respect to each other.
  • FIGS. 2 and 3 make it possible to provide a large number of easily and quickly replaceable nozzle assemblies in a relatively limited space. Self-sealing and secure mounting take place under the action of the melt pressure and the assemblies can be easily observed and cleaned from the service side, all as previously explained.
  • the feed member 2a has an enlarged bore at the end of the vertical feed passage 25a to receive a cylindrical piston 5a and the diaphragm 6a which cooperate under the influence of the melt pressure to produce a tight seal with the nozzle assembly over the annular gasket or sealing element 7a.
  • the piston and diaphragm combination is supported by the spring retention ring 28 which may also be used to prestress or place an initial tension on the sealing element 7a before the melt is introduced.
  • the diaphragm 6 or 6a may be composed of a resilient metal such as a corrosion-resistant steel alloy which may be welded to the piston along an inner edge or surface such that there is a resilient or elastic displacement of the diaphragm under melt pressure and an ability to spring back when this melt pressure is relieved. It is especially advantageous, however, to employ a diaphragm which is a deeply drawn sealing element composed of aluminum, and which is simply inserted into its correct position during assembly of the spinning unit. Under high melt pressure and temperature, this aluminum disc or diaphragm undergoes deformation so as to be applied in a tight and close fitting relationship with the abutting wall members.
  • a resilient metal such as a corrosion-resistant steel alloy
  • Such an aluminum sealing element then serves as a simple throwaway gasket which is replaced during each reassembly of the spinning head. Because of the high viscosity of the melt, it is practically impossible for any leaks to occur in the self-sealing arrangement. Also, such a deformable gasket or seal offers a large area of surface contact with the melt to transmit pressure to the relatively smaller annular surface are of the sealing means 7 or 7a.
  • the nozzle plate 4 with filter pack 8 is fixed in place within the casing 3a by the pressure exerted through the threading 20 of the cover member 26 having a cylindrical shape and being sealed against the nozzle plate 4 by the annular gasket 27.
  • Key holes. slots 29 or the like, can be provided in the upper face of cover member 26 to permit the insertion of a tool in tightening or loosening this threaded member.
  • the nozzle plate 4 with filter 8 is directly secured to the casing 26 which is integral with the covering means above the nozzle assembly, i.e., so as to provide a unitary casing and nozzle assembly similar to FIG. 6.
  • One advantage of these alternative embodiments resides in the reinforcement of the casing 3 or 26 by joining the nozzle plate 4 and/or the covering means 26 or 26 to each other. Members lla or Ila still cooperate with the grooved portion 12 of the feed member 2a to permit the sliding insertion or removal of the casing and nozzle assembly laterally of the feed member.
  • FIG. 6 has the further advantage that it can have a nozzle plate in the form of a rectangular die or so--called line die".
  • a spinning head for the spinning of thermoplastic polymers around a vertical axis including a relatively stationary feed member supplying the melt, a nozzle assembly laterally withdrawable from and insertable in said spinning head and connectable to said feed member in self-sealing relationship under the action of the melt pressure, said nozzle assembly comprising a casing member and, supported by and retained in said casing member, spinning elements including at least a die plate, elongated cooperating guideways being respectively provided on said feed member and said casing member for the withdrawal and insertion of said casing member with said spinning elements therein, said guideways being disposed so that the self-sealing forces due to the action of the melt pressure give rise, in a direction parallel to the vertical axis of said spinning head, substantially to only tensional stresses in said casing member.
  • a multi-unit spinning head apparatus having a plurality of nozzle assemblies, said appratus including a relatively stationary feed member common to said nozzle assemblies for supplying the melt to the individual assemblies, each said nozzle assembly being laterally withdrawable from and insertable in said feed member and eonnectable to said member in self-sealing relationship under the action of the melt pressure, and each comprising a casing member and, supported by and retained in said casing member, spinning elements including at least a die plate, and said apparatus further including a plurality of elongated cooperating guideways respectively provided on said common feed member and on the individual casing members, for the withdrawal and insertion of any of said casing members with the corresponding elements therein, each of said plurality of cooperating guideways being disposed so that the self-sealing forces due to the action of the melt pressure give rise, in a direction parallel to the axis of the corresponding nozzle assembly, substantially to only tensional stresses in the respective casing member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US401540A 1972-10-05 1973-09-27 Spinning head with an exchangeable, self-sealing nozzle assembly Expired - Lifetime US3891379A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722248756 DE2248756B2 (de) 1972-10-05 1972-10-05 Spinnkopf zum spinnen plastischer massen

Publications (1)

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US3891379A true US3891379A (en) 1975-06-24

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US401540A Expired - Lifetime US3891379A (en) 1972-10-05 1973-09-27 Spinning head with an exchangeable, self-sealing nozzle assembly

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US (1) US3891379A (enrdf_load_stackoverflow)
BR (1) BR7307319D0 (enrdf_load_stackoverflow)
DD (1) DD107314A1 (enrdf_load_stackoverflow)
DE (1) DE2248756B2 (enrdf_load_stackoverflow)
GB (1) GB1407172A (enrdf_load_stackoverflow)
IT (1) IT1000076B (enrdf_load_stackoverflow)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358375A (en) * 1979-09-11 1982-11-09 Allied Corporation Filter pack
US4645444A (en) * 1983-03-23 1987-02-24 Barmag Barmer Maschinenfabrik Aktiengesellschaft Melt spinning apparatus
US4648826A (en) * 1984-03-19 1987-03-10 Toray Industries, Inc. Melt-spinning apparatus
US4696633A (en) * 1984-05-26 1987-09-29 Barmag Ag Melt spinning apparatus
US4698008A (en) * 1984-06-22 1987-10-06 Barmag Ag Melt spinning apparatus
US4801257A (en) * 1986-12-16 1989-01-31 Barmag Ag Melt spinning apparatus
US4875846A (en) * 1985-11-16 1989-10-24 Heinz Reinbold Spinning apparatus
US5051088A (en) * 1988-04-11 1991-09-24 Hoechst Celanese Corporation Melt spinning machines
US5445509A (en) * 1990-10-17 1995-08-29 J & M Laboratories, Inc. Meltblowing die
US5580581A (en) * 1992-02-13 1996-12-03 Accurate Products Company Meltblowing die with replaceable preset die tip assembly
US5618566A (en) * 1995-04-26 1997-04-08 Exxon Chemical Patents, Inc. Modular meltblowing die
US5662947A (en) * 1993-06-21 1997-09-02 Rieter Automatik Gmbh Nozzle plate holding device for spinning of continuous filaments
US5733586A (en) * 1994-11-10 1998-03-31 Barmag Ag Spin beam for spinning a plurality of synthetic filament yarns and its manufacture
EP0828017A3 (de) * 1996-09-04 1998-11-11 B a r m a g AG Spinnbalken
US6210141B1 (en) 1998-02-10 2001-04-03 Nordson Corporation Modular die with quick change die tip or nozzle
US6287102B1 (en) * 1996-01-30 2001-09-11 C.A. Greiner Extruder with a shaping device
US6357762B1 (en) * 1998-05-13 2002-03-19 Zimmer Aktiengesellschaft Sealing element for melt channels
WO2004088007A1 (de) * 2003-03-29 2004-10-14 Saurer Gmbh & Co. Kg Vorrichtung zum schmelzspinnen
US20040228939A1 (en) * 2001-09-28 2004-11-18 Saurer Gmbh & Co. Kg Spinneret for melt spinning filaments
CN112760724A (zh) * 2020-12-16 2021-05-07 湖南三易精工科技有限公司 一种熔喷布生产用熔喷布挤出机的喷头组件及其使用方法
US20220403556A1 (en) * 2021-06-21 2022-12-22 Fratelli Ceccato Milano S.R.L. Multi-row coaxial melt-blown system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19735570C2 (de) * 1997-08-11 1999-12-16 Inventa Ag Spinnvorrichtung
CN113737291B (zh) * 2020-05-29 2023-12-19 欧瑞康纺织有限及两合公司 熔纺设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148003A (en) * 1937-04-28 1939-02-21 Jacob B Wurtzel Butter mold
US2385856A (en) * 1943-10-30 1945-10-02 Du Pont Large rectangular spinneret
US3480995A (en) * 1966-04-09 1969-12-02 Barmag Barmer Maschf Sealing device for the connecting point between feeding member and tool in extrusion presses
US3669584A (en) * 1968-10-24 1972-06-13 Teijin Ltd Melt-spinning apparatus
US3762854A (en) * 1970-04-08 1973-10-02 Akzona Inc Melt spinning apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148003A (en) * 1937-04-28 1939-02-21 Jacob B Wurtzel Butter mold
US2385856A (en) * 1943-10-30 1945-10-02 Du Pont Large rectangular spinneret
US3480995A (en) * 1966-04-09 1969-12-02 Barmag Barmer Maschf Sealing device for the connecting point between feeding member and tool in extrusion presses
US3669584A (en) * 1968-10-24 1972-06-13 Teijin Ltd Melt-spinning apparatus
US3762854A (en) * 1970-04-08 1973-10-02 Akzona Inc Melt spinning apparatus

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358375A (en) * 1979-09-11 1982-11-09 Allied Corporation Filter pack
US4645444A (en) * 1983-03-23 1987-02-24 Barmag Barmer Maschinenfabrik Aktiengesellschaft Melt spinning apparatus
EP0122464B1 (de) * 1983-03-23 1988-11-09 B a r m a g AG Spinnkopf zum Schmelzspinnen endloser Fäden
US4648826A (en) * 1984-03-19 1987-03-10 Toray Industries, Inc. Melt-spinning apparatus
US4696633A (en) * 1984-05-26 1987-09-29 Barmag Ag Melt spinning apparatus
US4698008A (en) * 1984-06-22 1987-10-06 Barmag Ag Melt spinning apparatus
US4875846A (en) * 1985-11-16 1989-10-24 Heinz Reinbold Spinning apparatus
US4801257A (en) * 1986-12-16 1989-01-31 Barmag Ag Melt spinning apparatus
US5051088A (en) * 1988-04-11 1991-09-24 Hoechst Celanese Corporation Melt spinning machines
US5445509A (en) * 1990-10-17 1995-08-29 J & M Laboratories, Inc. Meltblowing die
US5605706A (en) * 1990-10-17 1997-02-25 Exxon Chemical Patents Inc. Meltblowing die
US5580581A (en) * 1992-02-13 1996-12-03 Accurate Products Company Meltblowing die with replaceable preset die tip assembly
US5662947A (en) * 1993-06-21 1997-09-02 Rieter Automatik Gmbh Nozzle plate holding device for spinning of continuous filaments
US5733586A (en) * 1994-11-10 1998-03-31 Barmag Ag Spin beam for spinning a plurality of synthetic filament yarns and its manufacture
US5927590A (en) * 1994-11-10 1999-07-27 Barmag Ag Spin beam for spinning a plurality of synthetic filament yarns and its manufacture
US5618566A (en) * 1995-04-26 1997-04-08 Exxon Chemical Patents, Inc. Modular meltblowing die
US6287102B1 (en) * 1996-01-30 2001-09-11 C.A. Greiner Extruder with a shaping device
EP0828017A3 (de) * 1996-09-04 1998-11-11 B a r m a g AG Spinnbalken
US6083432A (en) * 1996-09-04 2000-07-04 Barmag Ag Melt spinning apparatus
US6210141B1 (en) 1998-02-10 2001-04-03 Nordson Corporation Modular die with quick change die tip or nozzle
US6357762B1 (en) * 1998-05-13 2002-03-19 Zimmer Aktiengesellschaft Sealing element for melt channels
US20040228939A1 (en) * 2001-09-28 2004-11-18 Saurer Gmbh & Co. Kg Spinneret for melt spinning filaments
US7172401B2 (en) * 2001-09-28 2007-02-06 Saurer Gmbh & Co. Kg Spinneret for melt spinning filaments
WO2004088007A1 (de) * 2003-03-29 2004-10-14 Saurer Gmbh & Co. Kg Vorrichtung zum schmelzspinnen
US20060013912A1 (en) * 2003-03-29 2006-01-19 Saurer Gmbh & Co. Kg Apparatus for melt-spinning filaments in a yarn forming operation
US7125238B2 (en) * 2003-03-29 2006-10-24 Saurer Gmbh & Co. Kg Apparatus for melt-spinning filaments in a yarn forming operation
CN112760724A (zh) * 2020-12-16 2021-05-07 湖南三易精工科技有限公司 一种熔喷布生产用熔喷布挤出机的喷头组件及其使用方法
US20220403556A1 (en) * 2021-06-21 2022-12-22 Fratelli Ceccato Milano S.R.L. Multi-row coaxial melt-blown system
US12043920B2 (en) * 2021-06-21 2024-07-23 Fratelli Ceccato Milano S.R.L. Multi-row coaxial melt-blown system

Also Published As

Publication number Publication date
DE2248756B2 (de) 1976-06-10
BR7307319D0 (pt) 1974-07-25
IT1000076B (it) 1976-03-30
DE2248756A1 (de) 1974-04-18
DD107314A1 (enrdf_load_stackoverflow) 1974-07-20
GB1407172A (en) 1975-09-24

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