core yarn

基本解釋

The tensile strength of the core yarn is the highest, the second is the folded yarn, and the lowest is the wrapped yarn.
包芯紗具有較高的斷裂強(qiáng)力，其次是平行紗，而包纏紗的最低；
The protection that wrapped yarn gives to the high performance core yarn improves the weaving performance of core spun yarn.
外層編織紗對(duì)高性能芯紗的保護(hù)使復(fù)合后的紗線的織造性能得到很大改善，可直接在二維或三維織機(jī)上進(jìn)行織造。
When the core yarn is led into the slab catcher, the presence of the core is explicated more than in a time after the winding of the core yarn (10) is started by the winding device (12).
在該導(dǎo)入時(shí)，與開始上述卷繞裝置（12）的包芯紗（10）的卷繞后的期間相比使芯線的存在明顯化。
ip.com

Baker tells me he can make a sock core just as cheaply as anyone in China or Honduras - the machine costs the same, so does the yarn, there's hardly any labor.
NPR: Alabama Town Questions an Economy of Socks