Fiber strand package having a size with low solvent content

A wound package produced according to a process comprising:

• i) mechanically drawing continuous filaments from thin streams of molten glass flowing from apertures provided in a base of a die plate;
• ii) collecting said filaments to form a strand or strands which are collected on a support, wherein a surface of said filaments is coated with a sizing composition while said filaments are being drawn, wherein said sizing composition has a solvent content less than 5 wt %, and wherein said sizing composition comprises a mixture of constituents which can be polymerized and/or crosslinked by heat treatment, at least 60 wt % of the constituents having a molecular weight (Mw) less than 750, less than 10 wt % being film-forming agents and 0 to 25 wt % being a member selected from the group consisting of a coupling agent, a lubricant, a stabilizer, an initiator, a catalyst for polymerization by heat treatment and a mixture thereof, and wherein said solvent is selected from the group consisting of an organic solvent and water;
• and
• iii) winding said strand or strands, formed by collection of said filaments, on a rotating support so as to form said wound package consisting of turns of strand coated with said sizing composition, wherein said filaments have an average diameter of between 5 and 24 μm.