Silk throwing

Silk throwing is the industrial process where silk that has been reeled into skeins, is cleaned, receives a twist and is wound onto bobbins. The yarn is now twisted together with threads, in a process known as doubling. Colloquially silk throwing can be used to refer to the whole process: reeling, throwing and doubling. Silk had to be thrown to make it strong enough to be used as organizine for the warp in a loom, or tram for weft.

History

Silk weaving is known to have been carried out in Sicily in the tenth century, and in 1474 there were 15,000 employed in the industry in Milan. There is an illustration of a circular handpowered throwing machine drawn in 1487 with 32 spindles. The Italians called the throwing machine, a filatoio, and the doubler, a torcitoio. The first evidence of an externally powered filatoio comes from the thirteenth century, and the earliest illustration from around 1500. Bologna became the most technological advanced silk throwing town, with filatoio driven by overhead shafts that were powered by water.