Glass direct roving production method and glass direct roving
AssigneeNippon Electric Glass Co., Ltd.
InventorAkira Kunitomo
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Abstract
Provided is a method for producing a glass direct roving that has excellent workability and can effectively increase the mechanical strength of a composite material obtained by combination with resin. A method for producing a glass direct roving 10 formed by directly winding up a bundle of glass filaments includes the steps of: applying a sizing agent containing an epoxy resin having an epoxy equivalent of 180 to 240 to surfaces of a plurality of glass filaments to bundle the plurality of glass filaments; winding up a bundle obtained by bundling the plurality of glass filaments, thus making a wound package; and thermally drying the sizing agent at a temperature of 135° C. to 155° C. to form a coating on the surfaces of the glass filaments.
Claims2
A glass direct roving formed by directly winding up a bundle of glass filaments,
- the glass direct roving comprising a glass strand including:
- a plurality of glass filaments;
- and a dry coating of sizing agent covering the surfaces of the glass filaments,
- wherein the coating contains an epoxy resin having an epoxy monomer ratio of 35% to 55% and a weight-average molecular weight Mw of 450 to 1100.
Dependencies are inferred from the claim text.