Method for manufacturing bead filter using an epoxy resin gel

A method for manufacturing bead filters each including a lead wire and a pair of ferrite cores each having a through hole, for eliminating electromagnetic interferences in electronic apparatuses, comprising the steps of:

• mixing 10-40 wt % of an epoxy powder and 60-90 wt % of an alcohol to prepare an epoxy resin gel having a viscosity of 30-100 cps;
• defoaming said epoxy resin gel;
• storing said epoxy resin gel into adhesive storage tank after defoaming;
• providing a plurality of U shaped lead wires;
• fitting a pair of said ferrite cores to a said lead wire disposing such assemblies upon a base paper moving over a first guiding face of a first guiding part of a body portion, and taping to move said lead wires toward a drying furnace;
• moving said cores fitted to said lead wires toward said first guiding part by means of a first inclined plate;
• applying said epoxy resin gel to said lead wire by means of an adhesive applying wheel after said cores have been moved toward said first guiding part;
• rotatingly moving said ferrite cores toward the epoxy resin gel applied portion by means of a second inclined plate which is installed between said adhesive applying wheel and said drying furnace so as to form an adhesive resin layer between the insides of the through holes and the outside of said lead wire;
• and
• carrying said ferrite cores to said drying furnace after the formation of said adhesive resin layer so as to dry said adhesive resin layer at a temperature of 150.degree.-400.degree. C.