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Related to Doubling: Doubling time, doubling up



the process by which several uniformly drawn threads are combined and then wound in parallel on a bobbin without twisting. Doubling is an auxiliary process in textile production, used to prepare thread for processing on twisters. In doubling, the thread is also cleaned of lint and waste, and the weak and overly thick sections are removed. The thread is cross wound on a cylindrical bobbin, which makes further processing easier.

Doubling is carried out on a doubler. The thread is wound off feed packages, the number of which equals the number of threads to be doubled, and passes over a guide rod. It then passes through a control and cleaning device, which consists of a tension device and two metal plates or blades that form a slit. The width of the slit selected depends on the nominal diameter of the thread; thus, thick sections of thread do not pass through the slit and break the thread. The tension applied causes the thread to break at weak points. The winding speed reaches 500 m/min.

In the production of twisted silk and chemical filaments, doubling is often accompanied by twisting and is carried out on a doubling-and-twisting frame. Spinning-and-twisting frames have been developed that combine the processes of spinning, doubling, twisting, and winding.


References in periodicals archive ?
Stacking means combining coupons from several sources, and doubling is when a store automatically doubles the value of a coupon, usually up to a certain maximum.
Doubling is a hot button issue for Southern California couponers because Vons stopped doing it this past spring, leaving Ralphs the only chain in the region that gives double credit on coupons.
We identify an inverse relationship between the average CFR and the average doubling time for different countries (Figure 2).
King, for example, suggests a doubling for Polonius and First Gravedigger ("Clowne"), one we often see, as in Robert Chetwyn's 1971 production, where James Cairncross took both roles.
By doubling our already generous Double Dip benefit, Hilton HHonors members can earn rewards in half the time.
By doubling the density of our dial access systems, Cisco fulfills our commitment to deliver unprecedented scalability and performance while maintaining investment protection for our customers," said Roland Acra, vice president and general manager of Cisco's Remote Access Business Unit.