[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:03.85,0:00:09.53,Default,,0000,0000,0000,,Rotor or open-end spinning came into widespread use in the late '70s and early '80s.
Dialogue: 0,0:00:09.69,0:00:13.08,Default,,0000,0000,0000,,It is still in use today and comprises a large percentage
Dialogue: 0,0:00:13.08,0:00:16.76,Default,,0000,0000,0000,,of the 100% cotton yarn spun in the United States.
Dialogue: 0,0:00:17.41,0:00:19.88,Default,,0000,0000,0000,,It is very fast when compared to ring spinning,
Dialogue: 0,0:00:20.09,0:00:22.56,Default,,0000,0000,0000,,up to 10 times the production per spindle.
Dialogue: 0,0:00:23.21,0:00:24.26,Default,,0000,0000,0000,,From a cost standpoint,
Dialogue: 0,0:00:24.33,0:00:27.05,Default,,0000,0000,0000,,it doesn't require the roving process step and
Dialogue: 0,0:00:27.05,0:00:29.46,Default,,0000,0000,0000,,it does not require an extra winding step.
Dialogue: 0,0:00:30.01,0:00:32.72,Default,,0000,0000,0000,,Yarn is ready for use directly from the machine.
Dialogue: 0,0:00:33.50,0:00:37.59,Default,,0000,0000,0000,,The process today is highly automated and includes automatic piecing,
Dialogue: 0,0:00:37.91,0:00:39.50,Default,,0000,0000,0000,,restarting of broken ends,
Dialogue: 0,0:00:39.63,0:00:40.54,Default,,0000,0000,0000,,and doffing,
Dialogue: 0,0:00:40.71,0:00:42.27,Default,,0000,0000,0000,,removal of full packages.
Dialogue: 0,0:00:43.19,0:00:45.17,Default,,0000,0000,0000,,For these important economic reasons,
Dialogue: 0,0:00:45.35,0:00:47.82,Default,,0000,0000,0000,,rotor spinning became the yarn making system of
Dialogue: 0,0:00:47.82,0:00:50.42,Default,,0000,0000,0000,,choice through the early '90s in the US.
Dialogue: 0,0:00:51.69,0:00:55.40,Default,,0000,0000,0000,,Yarn count range is somewhat limited when compared to ring spinning.
Dialogue: 0,0:00:56.04,0:01:00.85,Default,,0000,0000,0000,,Rotor spinning doesn't perform well at much above number 40 singles and
Dialogue: 0,0:01:00.85,0:01:04.97,Default,,0000,0000,0000,,is really most productive in the yarn counts below number 20 singles.
Dialogue: 0,0:01:05.89,0:01:11.32,Default,,0000,0000,0000,,More than 95% of denim yarn produced in the US is made using rotor spinning.
Dialogue: 0,0:01:12.37,0:01:16.11,Default,,0000,0000,0000,,The rotor spinning process is difficult to conceptualize.
Dialogue: 0,0:01:16.51,0:01:19.63,Default,,0000,0000,0000,,A sliver is used as the input and is fed into
Dialogue: 0,0:01:19.63,0:01:23.50,Default,,0000,0000,0000,,a small carting device called a combing roll or opening roll.
Dialogue: 0,0:01:23.99,0:01:27.23,Default,,0000,0000,0000,,This individualizes the fibers and performs the drafting.
Dialogue: 0,0:01:27.88,0:01:31.50,Default,,0000,0000,0000,,The loose fibers are sucked into a rotating rotor cup where they
Dialogue: 0,0:01:31.50,0:01:34.76,Default,,0000,0000,0000,,are attached to the rolling open end of yarn found there—
Dialogue: 0,0:01:35.18,0:01:37.27,Default,,0000,0000,0000,,thus the name open-end spinning.
Dialogue: 0,0:01:37.82,0:01:41.17,Default,,0000,0000,0000,,The yarn is withdrawn and the process becomes continuous.