Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
  • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
  • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
  • H01B3/308—Wires with resins
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
  • H01B13/06—Insulating conductors or cables
  • H01B13/14—Insulating conductors or cables by extrusion
  • H01B13/141—Insulating conductors or cables by extrusion of two or more insulating layers

Definitions

• the present invention relates to a new method for producing Vickel wires with two insulating layers made of different materials, so-called two-layer enamelled wires.
• Enamel-insulated winding wires are precisely characterized in the German standard DIN 46435 from April 1977. They are used on a large scale in electrical engineering, transformer construction and electronics.
• the conductor metal preferably copper or aluminum, is insulated with a thin, but mechanically and thermally extremely resistant synthetic resin lacquer layer.
• Such enamelled wires are produced on wire enamelling machines by repeatedly applying an enamelled wire enamel to the metal wire.
• wire enamel resin melts or dispersions and aqueous solutions of wire enamel resins are also used for wire enamelling.
• thermoplastics for thick-walled sheathing of electrical conductor bundles and for the production of conductor wires has long been known from the cable industry.
• German Auslegeschrift 2,638,763 already describes a process for the production of enamel-insulated winding wires by extrusion of partially crystalline thermoplastic polycondensates with crystallite melting points above 170 ° C., preferably above 250 ° C.
• the method according to the older application and all subsequent applications has the great advantage that no post-treatment - such as post-stretching or a hardening reaction - is required, which results in considerable time and energy savings.
• a varnish of a further, preferably linear polymers is then as a second layer according to the same V r e-drive on the conductor applied.
• a disadvantage of this method is the often low solubility of the linear polycondensates which are preferably used, so that these coatings have very low solids contents and require aggressive solvents which can adversely affect the basic insulation of the conductor during coating.
• thermoplastic is applied to an electrical conductor isolated by means of known wire enamels or wire enamel resins or to an electrical conductor insulated by extrusion coating with partially crystalline or amorphous thermoplastic polycondensates such that the total layer thickness of both insulating layers meets the requirements of the German standard DIN 46435 is sufficient.
• Polyesterimide, polyamideimide and polyimide are examples of the wire enamel resins.
• the wire enamel resins can be dissolved or dispersed in organic solvents or in water, or can be applied from the melt.
• the partially crystalline thermoplastic polycondensates of DE-AS 2 638 763 - such as linear polyesters and polyamides - and the amorphous polyether sulfones or partially crystalline polyether ketones of the subsequent applications are suitable. These polycondensates can optionally be used in a mixture with dyes, pigments, fillers and other auxiliaries.
• thermoplastic plastics are used for the second layer, the softening points of which are lower than those of the polycondensates of the first layer.
• extrudable thermoplastic materials are suitable for the second insulation layer to be applied by extrusion according to the invention - in which case, in order to improve the adhesion between the two insulation layers, application of an adhesion promoter to the base layer or intermediate heating of the insulated wire may be appropriate - in practice
• an adhesion promoter to the base layer or intermediate heating of the insulated wire
• Semi-crystalline or amorphous polyamides are particularly preferred.
• semi-crystalline polyamides examples include 6,6-polyamides, 6, lo-polyamides and others produced by polycondensation from aliphatic dicarboxylic acids and aliphatic diamines in question, the 6-polyamides, 11-polyamides, 12-polyamides, etc. formed from the lactams or ⁇ -amino carboxylic acids
• certain polyamides as the second layer have - as can be seen from some examples - the advantageous property of already flowing at moderately elevated temperatures and of firmly baking the windings or coils used, for example, in electrical engineering and consumer electronics, which means the use of the otherwise usual Makes impregnating varnish or impregnating resins superfluous.
• Polyvinyl acetals for the second layer.
• Polyvinyl butyrals are particularly preferred within this class of substances because of their swellability in volatile solvents, e.g. Alcohols which, as an alternative to the aforementioned thermal caking, allow the coils to solidify through the action of solvents.
• Polyvinyl butyrals with degrees of butyralization of 70-80% and average molecular weights of 30,000-200,000 are particularly suitable for this area of application.
• a decisive advantage of the process is that it is also possible to use polymers which are difficult or not at all soluble in conventional solvents.
• Examples 1 to 4 soft-annealed round copper wire with a diameter of 0.6 mm was used, which first passed through a preheating section and, after passing through the coating zone in the extruder head, through a stripper nozzle which regulates the layer thickness. After passing a cooling section the coated wire was wound up. The second layer was then applied.
• the specified extruder temperatures relate to the distance from the inlet to the nozzle.
• the last three temperature specifications apply to the nozzle system.
• a lubricant-free copper wire with a nominal diameter of 0.95 mm of type W 155 / W 180 was used, which was insulated with a polyester imide-based wire enamel.
• the total diameter of the insulated wire was 1.005 mm.
• the layer thickness (diameter increase) of the first insulation layer was therefore 55 ⁇ m.
• Coating material for the second layer is Coating material for the second layer
• a lubricant-free copper wire with a nominal diameter of 0.40 mm insulated with a polyesterimide-based wire enamel was used.
• the total diameter of the insulated wire was 0.430 mm.
• the diameter increase due to the basic insulation was therefore 30 ⁇ m.
• Coating material for the second layer Transparent amorphous polyamide made from dimethyl terephthalate and trimethyl hexamethylene diamine (mixture of isomers from 2,2,4- and 2,4,4-trimethyl hexamethylene diamine).

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Insulated Conductors (AREA)
• Organic Insulating Materials (AREA)
• Processes Specially Adapted For Manufacturing Cables (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Photoreceptors In Electrophotography (AREA)

Priority Applications (1)

Applications Claiming Priority (4)

Publications (2)

Family

ID=25604278

Family Applications (1)

Country Status (10)

Cited By (4)

Families Citing this family (5)

Citations (4)

• 1980
  • 1980-11-22 DE DE19803044059 patent/DE3044059A1/de not_active Withdrawn
  • 1980-12-11 EP EP19800107816 patent/EP0030717B1/fr not_active Expired
  • 1980-12-11 DE DE8080107816T patent/DE3068265D1/de not_active Expired
  • 1980-12-15 PT PT7219780A patent/PT72197B/pt unknown
  • 1980-12-16 ES ES497812A patent/ES497812A0/es active Granted
  • 1980-12-16 BR BR8008215A patent/BR8008215A/pt not_active IP Right Cessation
  • 1980-12-17 FI FI803942A patent/FI803942L/fi not_active Application Discontinuation
  • 1980-12-17 CA CA000367038A patent/CA1161616A/fr not_active Expired
  • 1980-12-18 TR TR2126380A patent/TR21263A/xx unknown
  • 1980-12-18 IN IN906/DEL/80A patent/IN155208B/en unknown
  • 1980-12-18 AU AU65497/80A patent/AU536356B2/en not_active Ceased

Patent Citations (4)

Non-Patent Citations (1)

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