US2623241A - Spinneret and its method of production - Google Patents

Spinneret and its method of production Download PDF

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US2623241A
US2623241A US183712A US18371250A US2623241A US 2623241 A US2623241 A US 2623241A US 183712 A US183712 A US 183712A US 18371250 A US18371250 A US 18371250A US 2623241 A US2623241 A US 2623241A
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wires
filaments
chemical treatment
laminated structure
plastic
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US183712A
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Mackay John D Mcc
Arthur W S Clark
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Imperial Chemical Industries Ltd
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Imperial Chemical Industries Ltd
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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
    • D01D4/02—Spinnerettes
    • D01D4/022—Processes or materials for the preparation of spinnerettes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0033—Moulds or cores; Details thereof or accessories therefor constructed for making articles provided with holes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/22—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/347—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation combined with compressing after the winding of lay-ups having a non-circular cross-section, e.g. flat spiral windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/545—Perforating, cutting or machining during or after moulding

Definitions

  • FIG-4 INVENTORS: John Doug/as McClure Mucky ⁇ ; A rf/rur We/Ieslv Stewart C/ ark BYM W V mORNEYS Patented Dec. 30, 1952 UNITED STATES PATENT OFFICE SPINNERET AND ITS METHOD OF PRODUCTION Application September 8, 1950, Serial No. 183,712
  • the present invention is concerned with spinnerets and a method for their production.
  • the conventional method of spinneret manufacture has been that of punching or drilling holes of the required diameter in thin sheets of metallic material requiring precision instruments and taking considerable time.
  • the object of the present invention is to provide improved plastic spinnerets and a method for their production which will enable such spinnerets to be produced conveniently and cheaply.
  • a method for the production of plastic spinnerets comprises forming a laminated structure comprising layers of substantially parallel filaments which can be removed by chemical treatment held separated by material unaffected by said chemical treatment, the said parallel filaments of one layer being substantially parallel to the said parallel filaments of any other layer, forming a solid block of plastic of the kind which is not dissolved by said chemical treatment in and throughout and surrounding said laminated structure, cutting said block into plates substantially perpendicular to the said filaments which can be removed by said chemical treatment, and removing the short filaments left in said plates by said chemical treatment.
  • the said layers in said laminated structure can be formed from woven fabric having substantially parallel filaments which can be removed by chemical treatment which does not remove the filaments crossing said parallel filaments.
  • the substantially parallel filaments can be for example metallic wires of the requisite diameter and solubility in acids and the filaments crossing said parallel filaments are not soluble in these acids.
  • the filaments crossing said parallel filaments may consist for example of textile filaments, glass filaments or metal wires unattackable by the acid which dissolves said parallel filaments.
  • the said layers in said laminated structure may be formed from textile covered filaments or plastic covered filaments.
  • each of said layers in the laminated structure may be separated by at least one layer of permeable material which is not attackable by said chemical treatment, as for example fabric material.
  • plastic spinnerets according to the invention contain unattackable fibres which are distributed in the plastic and therethrough at least in the a 2 vicinity of the perforations, spinnerets of high mechanical strength are formed.
  • thesubstantially parallel filaments which can be removed by a chemical treatment are metallic wires of the requisite diameter and solubility in acid while the filaments crossing said parallel filaments are not soluble in said acids and may consist of textile filaments, glass filaments or metal wire unattachable by the acid used for dissolving said parallel filaments.
  • the removal by said chemical treatment includes removal by solution in a, suitable solvent, removal by chemical reaction and electrolytic removal.
  • the said permeable material consists of fabric material.
  • a plastic of the kind which is not dissolved by said chemical treatment are those derived from liquids convertible into a plastic as for instance liquid polymerisable compounds for example, monomers such as methyl methacrylate and styrene; or thermosetting compositions comprising compounds capable of forming crosslinking resins and a solution of a catalyst therefor in a polymerising solvent as for instance a liquid composition comprising di-methacrylic ester of bis(beta hydroxy ethyl) phthalate, benzoyl peroxide and n-butyl methacrylate.
  • the said laminated structure can be formed by winding the said woven fabric into a spiral interleaved if desired with a spiral strip of said fabric material, so as to produce a roll of cloth with all the soluble filaments parallel to the axis.
  • the said laminated structure is formed by superimposing rectangular layers of said woven fabric, so that the parallel filaments of one layer are parallel to the said parallel filaments of any other layer, and separating said layers if desired by rectangular layers of said fabric material.
  • laminated structure is included a structure in which the layers thereof can be plane surfaces, curved surfaces or surfaces formed by rolling a strip of material as for in stance into a cylindrical body.
  • the laminated structure may have for instance a circular or rectangular cross-section.
  • the said solid block of plastic is formed by treating the said woven layers of fabric and the permeable material by impregnation either before the formation of the said laminated structure or after the said laminated structure has been produced with subsequent polymerisation.
  • the said laminated structure can be formed as a rigid bundle. preferably of substantially circular cross-section. of textile of plastic covered metal wires lying substantially parallel to one another.
  • the said bundle can be formed for example from a continuous length of covered metal wire wound spirally on a collapsable swift so that the bundle of wires formed into a ring thereon has a transverse semi-circular cross-section.
  • the ring of wires thus formed after removal from the swift can be deformed into a bundle of substantially parallel wires and of circular cross-section.
  • the bundle can be suitable wound at each end to keep the wires of the bundle tightly together.
  • Fig. 1 is a perspective view of semi-wire cloth with a warp of 0.0044" diameter iron wires spaced at 100 wires to the inch and with a weft of fine cotton threads
  • Fig. 2 is a perspective view of a length of the semi-wire cloth of Fig. 1 rolled into a cylinder
  • Fig. 3 is a perspective view of a cylinder formed from rectangular layers of the semi-wire cloth of Fig. 1 said layers being separated one from the other by rectangular layers of fabric material
  • Fig. 4 is a perspective view in part section of a solid cylindrical block of plastic showing a cut plate from which the wires have been removed and the remaining block in which the wires are still present.
  • the semi-wire cloth I with iron wires 2 and cotton threads 3 is cut into strips about 2 in. wide and 22 in. long with the iron wires 2 running across and the cotton wires 3 running along them.
  • Two of these strips I are rolled up with separating strips 2 in. wide of calico 4 and further layers of calico 4 are added to produce a plain margin 5.
  • the rolling is done in a dish containing a liquid resin such as a composition comprising dimethacrylic ester of bis(beta hydroxy ethyl) phthalate, benzoyl peroxide and n-butyl methacrylate which will polymerise when heated.
  • the roll 6 thus produced is placed in a tight fitting rubber bag with a further small quantity of a liquid resin and the bag closed.
  • the whole is to be in a vessel heated at a temperature of 45 C. rising after 2 days to 110 C. Then the vessel is cooled.
  • the resulting block 1 is cut on a lathe into slices 8 about a; in. thick by 1% in. diameter, the part containing the iron wires 2 occupying about 1 in. diameter.
  • These slices 8 are polished and the wires 2 are dissolved out by immersing in warm dilute hydrochloric acid containing a trace of cupric chloride.
  • An alternative method of impregnation is to put the dried roll 8 into a tight fitting rubber tube closed at the bottom with a valve and to apply a vacuum to the top end. The valve is then opened to a supply of liquid resin which is then drawn right through the roll 6. This method has the advantage of removing all the air from the cloth before the resin is applied.
  • An alternative way for instance of removing the iron wire 2 from the slice 8 is to put the slice 8 between mercury on one side and a salt solution on the other side and to connect the two liquids to a source of electricity in such manner that the iron wires form the anode.
  • the semi-wire cloth I is cut into a number of rectangular strips of different widths, the maximum width being 1 /2 in. and all of equal length of say 2 /2 in. Rectangles of fabric material are also produced of similarly graded width with a maximum width of 2 in. The length of all these rectangles of fabric material is also 2 in.
  • a laminated structure is produced from these rectangles of wire cloth and fabric material by interposing a layer of fabric material between layers of the wire cloth.
  • the laminated structure is produced in the form of a compact cylinder by arranging the rectangles of wire cloth and fabric material in such a manner that the widest rectangles are in the middle and that there is a gradation in the width of the rectangles as these rectangles are superimposed one upon the other.
  • the laminated structure thus produced can be impregnated with the liquid resin in accordance with any of the methods employed in the first embodiment and the solid block of plastic eventually produced is also cut into thin plates substantially perpendicular to the iron wires 2 and these wires are then removed from the thin plates by a chemical treatment.
  • the laminated structure which can be produced in accordance with the third described embodiment of the invention for instance a bundle of substantially parallel cotton covered iron wires can also be impregnated with the liquid resin in accordance with any of the methods employed in the first embodiment and the solid block of plastic eventually produced is also cut into thin plates substantially perpendicular to the cotton covered iron wires and the iron wires therefrom are then removed from the thin plates by a chemical treatment.
  • a method for the production of plastic spinnerets which comprises forming a laminated structure composed of a plurality of substantially parallel metal wires which are dissolvable by chemical treatment, said wires being held in parallel spaced relationship from each other by fabric material and said laminated structure being impregnated with a liquid composition which is convertible into a solid resin that is unaffected. by said chemical treatment, thereafter converting said liquid composition into solid resin form to produce a solid block of resin in, throughout and surrounding said laminated structure, cutting said block into plates substantially perpendicular to said metal wires, and thereafter removing the short wires left in said plates by said chemical treatment.
  • said laminated structure is formed of layers of woven fabric made up of substantially parallel metal wires which are dissolvable by the chemical treatment and filaments crossing said parallel metal wires which are not removable by said chemical treatment.
  • each of said layers of woven fabric is separated by a layer of permeable fabric material which is not attackable by said chemical treatment.
  • said laminated structure is formed by winding a woven fabric made up of substantially parallel metal wires which are dissolvable by the chemical treatment and filaments crossing said parallel metal wires which are not removable by said chemical treatment into a roll in which the metal wires extend parallel to the axis.
  • a method for the production of plastic spinnerets which comprises forming a rigid bundle of substantially parallel, covered metal wires, said wires being dissolvable by chemical treatment but the coverings thereof being unaffected by said chemical treatment and said laminated structure being impregnated with a liquid composition which is convertible into a solid resin that is also unaffected by said chemical treatment, thereafter converting said liquid composition into solid resin form to produce a solid block of resin in, throughout and surrounding said laminated structure, cutting said block into plates substantially perpendicular to said metal wires, and thereafter removing the short wires left in said plates by said chemical treatment.
  • liquid 6 composition is a thermosetting composition comprising compounds capable of forming crosslinking resins and a solution of a catalyst therefor in a polymerizing solvent.
  • thermosetting composition is a liquid composition comprising dimethacrylic ester of bis(beta-hydroxyethyl) phthalate benzoyl peroxide and n-butyl methacrylate.
  • Plastic spinnerets characterised in that the plastic thereof has fibres distributed therethrough at least in the vicinity of the perforations.

Description

Dec. 30, 1952 J. D. Mcc. MACKAY EIAL $623,241
SPINNERET AND ITS METHOD OF PRODUCTION Filed Sept. 8, 1950 F162 FIG 5 FIG-4 INVENTORS: John Doug/as McClure Mucky}; A rf/rur We/Ieslv Stewart C/ ark BYM W V mORNEYS Patented Dec. 30, 1952 UNITED STATES PATENT OFFICE SPINNERET AND ITS METHOD OF PRODUCTION Application September 8, 1950, Serial No. 183,712
In Great Britain October 31, 1949 9 Claims.
The present invention is concerned with spinnerets and a method for their production.
The conventional method of spinneret manufacture has been that of punching or drilling holes of the required diameter in thin sheets of metallic material requiring precision instruments and taking considerable time.
The object of the present invention is to provide improved plastic spinnerets and a method for their production which will enable such spinnerets to be produced conveniently and cheaply.
According to the present invention a method for the production of plastic spinnerets comprises forming a laminated structure comprising layers of substantially parallel filaments which can be removed by chemical treatment held separated by material unaffected by said chemical treatment, the said parallel filaments of one layer being substantially parallel to the said parallel filaments of any other layer, forming a solid block of plastic of the kind which is not dissolved by said chemical treatment in and throughout and surrounding said laminated structure, cutting said block into plates substantially perpendicular to the said filaments which can be removed by said chemical treatment, and removing the short filaments left in said plates by said chemical treatment.
The said layers in said laminated structure can be formed from woven fabric having substantially parallel filaments which can be removed by chemical treatment which does not remove the filaments crossing said parallel filaments.
The substantially parallel filaments can be for example metallic wires of the requisite diameter and solubility in acids and the filaments crossing said parallel filaments are not soluble in these acids.
The filaments crossing said parallel filaments may consist for example of textile filaments, glass filaments or metal wires unattackable by the acid which dissolves said parallel filaments.
If desired the said layers in said laminated structure may be formed from textile covered filaments or plastic covered filaments.
Again, if desired, each of said layers in the laminated structure may be separated by at least one layer of permeable material which is not attackable by said chemical treatment, as for example fabric material.
If plastic spinnerets according to the invention contain unattackable fibres which are distributed in the plastic and therethrough at least in the a 2 vicinity of the perforations, spinnerets of high mechanical strength are formed.
Preferably in said woven fabric thesubstantially parallel filaments which can be removed by a chemical treatment are metallic wires of the requisite diameter and solubility in acid while the filaments crossing said parallel filaments are not soluble in said acids and may consist of textile filaments, glass filaments or metal wire unattachable by the acid used for dissolving said parallel filaments.
The removal by said chemical treatment includes removal by solution in a, suitable solvent, removal by chemical reaction and electrolytic removal.
Preferably the said permeable material consists of fabric material.
Examples of a plastic of the kind which is not dissolved by said chemical treatment are those derived from liquids convertible into a plastic as for instance liquid polymerisable compounds for example, monomers such as methyl methacrylate and styrene; or thermosetting compositions comprising compounds capable of forming crosslinking resins and a solution of a catalyst therefor in a polymerising solvent as for instance a liquid composition comprising di-methacrylic ester of bis(beta hydroxy ethyl) phthalate, benzoyl peroxide and n-butyl methacrylate.
In accordance with one embodiment of the invention the said laminated structure can be formed by winding the said woven fabric into a spiral interleaved if desired with a spiral strip of said fabric material, so as to produce a roll of cloth with all the soluble filaments parallel to the axis.
In accordance with another embodiment of the present invention the said laminated structure is formed by superimposing rectangular layers of said woven fabric, so that the parallel filaments of one layer are parallel to the said parallel filaments of any other layer, and separating said layers if desired by rectangular layers of said fabric material.
By the term laminated structure" is included a structure in which the layers thereof can be plane surfaces, curved surfaces or surfaces formed by rolling a strip of material as for in stance into a cylindrical body.
The laminated structure" may have for instance a circular or rectangular cross-section.
The said solid block of plastic is formed by treating the said woven layers of fabric and the permeable material by impregnation either before the formation of the said laminated structure or after the said laminated structure has been produced with subsequent polymerisation.
In accordance with still another embodiment of the invention the said laminated structure can be formed as a rigid bundle. preferably of substantially circular cross-section. of textile of plastic covered metal wires lying substantially parallel to one another. The said bundle can be formed for example from a continuous length of covered metal wire wound spirally on a collapsable swift so that the bundle of wires formed into a ring thereon has a transverse semi-circular cross-section. The ring of wires thus formed after removal from the swift can be deformed into a bundle of substantially parallel wires and of circular cross-section. The bundle can be suitable wound at each end to keep the wires of the bundle tightly together.
The method of the present invention is illustrated by way of example by reference to the diagrammatic drawings accompanying the specification whereof Figures 1, 2 and 4 illustrate the first embodiment of the invention and Figures 1, 3 and 4 illustrate the second embodiment of the invention.
Fig. 1 is a perspective view of semi-wire cloth with a warp of 0.0044" diameter iron wires spaced at 100 wires to the inch and with a weft of fine cotton threads, Fig. 2 is a perspective view of a length of the semi-wire cloth of Fig. 1 rolled into a cylinder, Fig. 3 is a perspective view of a cylinder formed from rectangular layers of the semi-wire cloth of Fig. 1 said layers being separated one from the other by rectangular layers of fabric material, and Fig. 4 is a perspective view in part section of a solid cylindrical block of plastic showing a cut plate from which the wires have been removed and the remaining block in which the wires are still present.
In accordance with the first embodiment of the invention and with reference to Figs. 1, 2 and 4 the semi-wire cloth I with iron wires 2 and cotton threads 3 is cut into strips about 2 in. wide and 22 in. long with the iron wires 2 running across and the cotton wires 3 running along them. Two of these strips I are rolled up with separating strips 2 in. wide of calico 4 and further layers of calico 4 are added to produce a plain margin 5. The rolling is done in a dish containing a liquid resin such as a composition comprising dimethacrylic ester of bis(beta hydroxy ethyl) phthalate, benzoyl peroxide and n-butyl methacrylate which will polymerise when heated. Care is taken to see that the whole of the roll is thoroughly impregnated. The roll 6 thus produced is placed in a tight fitting rubber bag with a further small quantity of a liquid resin and the bag closed. The whole is to be in a vessel heated at a temperature of 45 C. rising after 2 days to 110 C. Then the vessel is cooled. The resulting block 1 is cut on a lathe into slices 8 about a; in. thick by 1% in. diameter, the part containing the iron wires 2 occupying about 1 in. diameter. These slices 8 are polished and the wires 2 are dissolved out by immersing in warm dilute hydrochloric acid containing a trace of cupric chloride.
An alternative method of impregnation is to put the dried roll 8 into a tight fitting rubber tube closed at the bottom with a valve and to apply a vacuum to the top end. The valve is then opened to a supply of liquid resin which is then drawn right through the roll 6. This method has the advantage of removing all the air from the cloth before the resin is applied.
4 An alternative way for instance of removing the iron wire 2 from the slice 8 is to put the slice 8 between mercury on one side and a salt solution on the other side and to connect the two liquids to a source of electricity in such manner that the iron wires form the anode.
In accordance with the second embodiment of the invention the semi-wire cloth I is cut into a number of rectangular strips of different widths, the maximum width being 1 /2 in. and all of equal length of say 2 /2 in. Rectangles of fabric material are also produced of similarly graded width with a maximum width of 2 in. The length of all these rectangles of fabric material is also 2 in. A laminated structure is produced from these rectangles of wire cloth and fabric material by interposing a layer of fabric material between layers of the wire cloth. The laminated structure is produced in the form of a compact cylinder by arranging the rectangles of wire cloth and fabric material in such a manner that the widest rectangles are in the middle and that there is a gradation in the width of the rectangles as these rectangles are superimposed one upon the other.
The laminated structure thus produced can be impregnated with the liquid resin in accordance with any of the methods employed in the first embodiment and the solid block of plastic eventually produced is also cut into thin plates substantially perpendicular to the iron wires 2 and these wires are then removed from the thin plates by a chemical treatment.
The laminated structure which can be produced in accordance with the third described embodiment of the invention for instance a bundle of substantially parallel cotton covered iron wires can also be impregnated with the liquid resin in accordance with any of the methods employed in the first embodiment and the solid block of plastic eventually produced is also cut into thin plates substantially perpendicular to the cotton covered iron wires and the iron wires therefrom are then removed from the thin plates by a chemical treatment.
What we claim is:
l. A method for the production of plastic spinnerets which comprises forming a laminated structure composed of a plurality of substantially parallel metal wires which are dissolvable by chemical treatment, said wires being held in parallel spaced relationship from each other by fabric material and said laminated structure being impregnated with a liquid composition which is convertible into a solid resin that is unaffected. by said chemical treatment, thereafter converting said liquid composition into solid resin form to produce a solid block of resin in, throughout and surrounding said laminated structure, cutting said block into plates substantially perpendicular to said metal wires, and thereafter removing the short wires left in said plates by said chemical treatment.
2. The method of claim 1, wherein said laminated structure is formed of layers of woven fabric made up of substantially parallel metal wires which are dissolvable by the chemical treatment and filaments crossing said parallel metal wires which are not removable by said chemical treatment.
3. The method of claim 2, wherein each of said layers of woven fabric is separated by a layer of permeable fabric material which is not attackable by said chemical treatment.
. 4. The method of claim 1, wherein said structure is formed by superimposing rectangular layers of woven fabric made up of substantially parallel metal wires which are dissolvable by the chemical treatment and filaments crossing said parallel metal wires which are not removable by said chemical treatment.
5. Th method of claim 1, wherein said laminated structure is formed by winding a woven fabric made up of substantially parallel metal wires which are dissolvable by the chemical treatment and filaments crossing said parallel metal wires which are not removable by said chemical treatment into a roll in which the metal wires extend parallel to the axis.
6. A method for the production of plastic spinnerets which comprises forming a rigid bundle of substantially parallel, covered metal wires, said wires being dissolvable by chemical treatment but the coverings thereof being unaffected by said chemical treatment and said laminated structure being impregnated with a liquid composition which is convertible into a solid resin that is also unaffected by said chemical treatment, thereafter converting said liquid composition into solid resin form to produce a solid block of resin in, throughout and surrounding said laminated structure, cutting said block into plates substantially perpendicular to said metal wires, and thereafter removing the short wires left in said plates by said chemical treatment.
7. The method of claim 1, wherein the liquid 6 composition is a thermosetting composition comprising compounds capable of forming crosslinking resins and a solution of a catalyst therefor in a polymerizing solvent.
8. The method of claim '7 wherein the thermosetting composition is a liquid composition comprising dimethacrylic ester of bis(beta-hydroxyethyl) phthalate benzoyl peroxide and n-butyl methacrylate.
9. Plastic spinnerets characterised in that the plastic thereof has fibres distributed therethrough at least in the vicinity of the perforations.
JOHN D. McC. MACKAY. ARTHUR W. S. CLARK.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,654,936 Jones Jan. 3, 1928 2,266,349 Wempe Dec. 16, 1941 2,360,479 Detrick, Oct. 1'7, 1944 2,506,244 Stopka May 2, 1950 2,510,598 Oles June 6, 1950 FOREIGN PATENTS Number Country Date 161 526 Great Britain Mar. 23. 1922
US183712A 1949-10-31 1950-09-08 Spinneret and its method of production Expired - Lifetime US2623241A (en)

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US2663663A (en) * 1952-01-10 1953-12-22 Westinghouse Electric Corp Thermosetting synthetic resin laminate with a predetermined roughened surface and process for producing the same
US3202733A (en) * 1962-03-06 1965-08-24 Esb Reeves Corp Method of making microporous plastic
US3473985A (en) * 1964-08-28 1969-10-21 Us Navy Porous plastic
US3630799A (en) * 1966-06-06 1971-12-28 Thomas & Betts Corp Method of making a supporting medium having a plurality of spaced holes
US3663332A (en) * 1966-08-30 1972-05-16 Armstrong Cork Co A method of forming a gasket
US3670069A (en) * 1969-09-15 1972-06-13 Itt Process for forming hydroxyethyl cellulose fibers having high water absorption and high water retention properties
US4399084A (en) * 1980-08-18 1983-08-16 Teijin Limited Process for producing a fibrous assembly
US5490602A (en) * 1992-06-15 1996-02-13 Short Brothers Plc Composite structure manufacture

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DE1047984B (en) * 1953-06-25 1958-12-31 Trikotfabriken J Schiesser A G Spinning head for producing composite artificial threads or hollow threads and a method for producing such a spinning head
US4466860A (en) * 1981-09-21 1984-08-21 Giordano Aggio Method for producing etched patterns on textile fabrics
FR2590518B1 (en) * 1985-11-22 1988-07-15 Spml Soc Civ Inventeurs NEW COMPOSITE PRODUCT BASED ON YARN OR FIBER REINFORCEMENT, IN PARTICULAR WOVEN OR KNITTED WOVEN

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DE536666C (en) * 1928-06-26 1931-10-24 Bakelite Ges M B H Spinneret, especially for the manufacture of rayon
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US2266349A (en) * 1937-07-10 1941-12-16 Wempe Bernhard Method of producing holes in thin sheets of metal or glass
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US2510598A (en) * 1944-12-12 1950-06-06 Mallory & Co Inc P R Method of making iron cores
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Publication number Priority date Publication date Assignee Title
US2663663A (en) * 1952-01-10 1953-12-22 Westinghouse Electric Corp Thermosetting synthetic resin laminate with a predetermined roughened surface and process for producing the same
US3202733A (en) * 1962-03-06 1965-08-24 Esb Reeves Corp Method of making microporous plastic
US3473985A (en) * 1964-08-28 1969-10-21 Us Navy Porous plastic
US3630799A (en) * 1966-06-06 1971-12-28 Thomas & Betts Corp Method of making a supporting medium having a plurality of spaced holes
US3663332A (en) * 1966-08-30 1972-05-16 Armstrong Cork Co A method of forming a gasket
US3670069A (en) * 1969-09-15 1972-06-13 Itt Process for forming hydroxyethyl cellulose fibers having high water absorption and high water retention properties
US4399084A (en) * 1980-08-18 1983-08-16 Teijin Limited Process for producing a fibrous assembly
US5490602A (en) * 1992-06-15 1996-02-13 Short Brothers Plc Composite structure manufacture

Also Published As

Publication number Publication date
BE498940A (en)
CH292033A (en) 1953-07-31
GB683622A (en) 1952-12-03
FR1026230A (en) 1953-04-24
DE922075C (en) 1955-03-07

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