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Publication numberUS2623241 A
Publication typeGrant
Publication dateDec 30, 1952
Filing dateSep 8, 1950
Priority dateOct 31, 1949
Also published asDE922075C
Publication numberUS 2623241 A, US 2623241A, US-A-2623241, US2623241 A, US2623241A
InventorsClark Arthur W S, Mcc Mackay John D
Original AssigneeIci Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Spinneret and its method of production
US 2623241 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

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

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1654936 *Mar 23, 1926Jan 3, 1928Baker & Co IncMethod of making spinnerets
US2266349 *Jul 11, 1938Dec 16, 1941Wempe BernhardMethod of producing holes in thin sheets of metal or glass
US2360479 *Jul 10, 1942Oct 17, 1944Western Electric CoCondenser dielectric and method of making
US2506244 *Jul 9, 1947May 2, 1950Spolek Pro Chemickou A Lutni VMethod of producing ceramic bodies having longitudinal passages
US2510598 *Dec 12, 1944Jun 6, 1950Mallory & Co Inc P RMethod of making iron cores
GB161526A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2663663 *Jan 10, 1952Dec 22, 1953Westinghouse Electric CorpThermosetting synthetic resin laminate with a predetermined roughened surface and process for producing the same
US3202733 *Mar 6, 1962Aug 24, 1965Esb Reeves CorpMethod of making microporous plastic
US3473985 *Aug 28, 1964Oct 21, 1969Us NavyPorous plastic
US3630799 *Jul 7, 1969Dec 28, 1971Thomas & Betts CorpMethod of making a supporting medium having a plurality of spaced holes
US3663332 *Jan 27, 1970May 16, 1972Armstrong Cork CoA method of forming a gasket
US3670069 *Sep 15, 1969Jun 13, 1972IttProcess for forming hydroxyethyl cellulose fibers having high water absorption and high water retention properties
US4399084 *Aug 17, 1981Aug 16, 1983Teijin LimitedExtrusion through spinneret with openings of special opening ratio
US5490602 *Jun 14, 1993Feb 13, 1996Short Brothers PlcComposite structure manufacture
Classifications
U.S. Classification425/464, 65/126, 156/193, 156/155, 264/219, 65/42, 139/425.00R, 65/483
International ClassificationB29C33/00, D01D4/00, B29C70/22, D01D4/02, B29C70/34, B29C70/54, B29C70/04, B29C70/10
Cooperative ClassificationD01D4/022, B29C70/347, B29C70/22, B29C70/545, B29C33/0033
European ClassificationB29C33/00D, B29C70/34C, B29C70/54D, D01D4/02B, B29C70/22