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Title:
METHOD FOR MANUFACTURING A YARN OF PRECIOUS METAL, APPARATUS, COMPOSITE YARN AND FRAME
Document Type and Number:
WIPO Patent Application WO/2005/102095
Kind Code:
A1
Abstract:
The present invention relates to a method for manufacturing a yarn of a precious metal, such as gold, platinum, copper and the like, comprising the step of vacuum-depositing a precious metal on a base core and then extracting said core in order to obtain the yarn of precious metal suitable for weaving. The present invention further refers to the apparatus for carrying out such method, to the composite yarn obtained as intermediate product of the manufacturing method, and to the yarn of precious metal obtained through the above method.

Inventors:
BUSI MAURO (IT)
CIOCCA CLAUDIO (IT)
Application Number:
PCT/IT2005/000216
Publication Date:
November 03, 2005
Filing Date:
April 14, 2005
Export Citation:
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Assignee:
BUSI MAURO (IT)
CIOCCA CLAUDIO (IT)
International Classes:
A44C27/00; D06M11/83; (IPC1-7): A44C27/00; D06M11/83
Domestic Patent References:
WO2003054282A22003-07-03
Foreign References:
DE19910985A12000-09-21
EP0293229A21988-11-30
Attorney, Agent or Firm:
Chimini, Francesco (Piazzale Arnaldo 2, Brescia, IT)
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Description:
DESCRIPTION "Method for manufacturing a yarn of precious metal, apparatus, composite yarn and frame" [0001] . The present invention refers to a method for manufacturing a yarn of precious metal, for example gold, silver, platinum, copper, suitable for being used on textile machine for manufacturing a fabric. [0002] . Moreover, the present invention refers to an apparatus for carrying out the method, to a composite yarn obtainable as intermediate product and to a frame to use in such apparatus for carrying out the method. [0003] . One of the trends that can be currently noted in the field of precious metal processing is that of manufacturing a yarn of precious metal adapted for being woven. The object of arranging such a yarn is that of manufacturing, besides the standard jewellery items, such as bracelets, necklaces and the like, having a body composed of a weaving of such yarn, also portions of clothes or accessories for clothing in a precious metal. [0004] . There are also known methods for manufacturing a yarn of precious metal, adapted for being woven. [0005] . For example, document WO03/054282 discloses a method for manufacturing a yarn wherein the precious metal is laid on a yarn core by a galvanic deposition process. [0006] . However, the above method can manufacture a yarn not very suitable for being processed according to the conventional textile processes, especially due to the high stiffness exhibited by said yarn. [0007] . Document JP07207574 discloses a further metal for manufacturing a yarn whereon precious metal is laid, but also in this instance, the resulting yarn exhibits too high stiffness for textile processing. [0008] . The object of the present invention is to provide a method for manufacturing a yarn of precious metal suitable for being processed through textile processes for obtaining woven items, for example portions of clothes or accessories for clothing, which should overcome the disadvantages mentioned with reference to the prior art. [0009] . Such object is achieved by a method according to claim 1. The dependent claims describe embodiment variants. [0010] . The features and advantages of the method according to the present invention will appear more clearly from the following exemplificative and non- limiting description. The annexed figures 1 and 2 show a frame used in the method according to the invention, respectively according to a side view and to a plan view. [0011] . The method according to the present invention is suitable for manufacturing a base core, for example consisting of a natural or synthetic textile fibre, and a precious metal, for example gold, silver, copper or platinum or their alloys, or of any other type, for obtaining a yarn of a precious metal. [0012] . Preferably, said base core is a single-thread yarn, that is, a yarn composed of a single fibre. [0013] . The method according to the present invention can be carried out through a vacuum device comprising a processing chamber, vacuum means adapted for creating the vacuum, at least partly, into said processing chamber, a covering adapted for coupling with said processing chamber in a substantially sealed manner, vaporisation means adapted for bringing the precious metal to gaseous state inside said processing chamber. [0014] . Preferably, said vaporisation means comprise means for injecting a precious metal at the gaseous state into said chamber. In other words the precious metal, reduced at the gaseous state outside said chamber, is injected into said chamber through said injecting means. [0015] . In a further embodiment, said vaporisation means comprise heating means or plasma excitation means adapted for dissociating the metal at the gaseous state. [0016] . In yet other words, said vaporisation means allow carrying out a chemical deposition (CVD) or a physical deposition (PVD) of the precious metal. [0017] . According to a preferred embodiment, the manufacturing method comprises a step of eliminating any impurities present on said base core. For example, said step of elimination comprises a step of washing said base core through solutions suitable for removing the impurities from the base core surface, for example for removing surface oxides and the like. [0018] . The method further comprises a step of arranging at least one portion of said base core into the processing chamber of said vacuum device. [0019] . Preferably, said arrangement step comprises a step of associating said core portion to a frame 1 adapted for being contained into said processing chamber (figure 1) . The frame associated to a portion of the base core is seated into the processing chamber. [0020] . Frame 1 extends along a frame axis X-X, between a bottom base 2 and a top base 4, axially spaced. Said bottom base 2 and said top base 4 comprise an outer ring 6 and arms 8 arranged diametrically cross-wise inside ring 6. [0021] . Moreover, said frame 1 comprises a plurality of bars 10 having axial extension and such as to connect ring 6 of the bottom base 2 to ring 6 of top base 4. [0022] . Preferably, said bars 10 exhibit an outside knurling to favour covering the core portion wound on the frame. [0023] . In other words, said knurling realises an example of spacing means adapted for spacing the core portion wound to the bars for decreasing the contact surface between said core portion and said bars, to favour covering said core portion. [0024] . According to a further embodiment variant of the method, the base core portion is arranged inside the processing chamber according to an uninterrupted process. In other words, the base core continuously passes through the processing chamber and exhibits a fixed advance speed. [0025] . The method further comprises a step of creating the vacuum, at least partly, into said processing chamber. Said step of creating the vacuum comprises a step of actuating said vacuum means, for example actuating a vacuum pump. [0026] . The method further comprises the step of bringing said precious metal to the gaseous state inside said processing chamber. [0027] . Preferably, said step of bringing the precious metal to the gaseous state comprises a step of vaporising said precious metal, already arranged inside the processing chamber, to bring it from a solid state to a gaseous state. [0028] . According to an embodiment variant, said step of bringing the precious metal to the gaseous state into the processing chamber comprises the step of letting said precious metal, already reduced to the gaseous state, into said processing chamber. Preferably, said injection step comprises a step of dissociating the precious metal in the gaseous state, by heating (MOCVD) or by plasma excitation (PECVD) . [0029] . The method further comprises a step of depositing said precious metal in the gaseous state onto said base core for obtaining a composite yarn comprising the base core and a precious metal coating. [0030] . Preferably, said step of depositing the precious metal in the gaseous state onto the base core comprises a step of moving said base core portion inside said processing chamber. Preferably, said moving step comprises a step of rotating the frame inside the processing chamber, about an axis of the processing chamber or about its axis. [0031] . Said depositing step further comprises a step of generating magnetic fields adapted for bringing said precious metal to the gaseous state on the base core. [0032] . The method further comprises a step of collecting said composite yarn from the processing chamber and a step of processing said composite yarn for obtaining a yarn to be woven. [0033] . According to an execution variant, said processing step comprises a step of separating the base core from said composite yarn, thus obtaining a yarn to be woven consisting of just the precious metal coating of the composite yarn. Preferably, said separation step comprises the step of extracting said base core from said composite yarn. Preferably, said extraction step comprises the step of wrinkling said coating. [0034] . According to an execution variant, said method further comprises a step of checking the thickness of the coating obtained onto said base core. [0035] . Innovatively, the method according to the present invention allows obtaining a yarn of a precious metal especially suitable for textile processing. [0036] . Advantageously, moreover, even though the yarn of precious metal exhibits the necessary elasticity, it exhibits high surface hardness, useful for proper execution of weaving. [0037] . Advantageously, moreover, the method according to the present invention exhibits low environmental impact. [0038] . According to a further advantageous aspect, the method according to the present invention allows obtaining a yarn of a precious metal exhibiting a desired colour. [0039] . Advantageously, moreover, it is possible to obtain high production volumes, both in the process with frame and in the uninterrupted one. [0040] . Advantageously, the base core consisting of a single-thread yarn allows obtaining a composite yarn from which the core is easily extracted. Moreover, the coating exhibits the desirable elasticity since the single-thread core prevents the formation of ribbing inside the coating during the precious metal deposition, which would increase its stiffness. [0041], Advantageously, moreover, unlike what happens in known processes, the base core is loosely wound on the frame for acting just as a support to said base. This allows depositing the precious metal on a loose base core, so that at the end of the deposition of the precious metal, the composite yarn is not especially- stiff, unlike what happens in known processes. [0042] . Finally, according to a further advantageous aspect, the method according to the present invention and the frame favour the spreading of the precious metal in the gaseous state around the base core even if wound on the frame, thus obtaining an even coating. [0043] . It is clear that a man skilled in the art can make several changes and adjustments to the method described above in order to meet specific and incidental needs, all falling within the scope of protection defined in the following claims.



 
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