Bobbins (textile)
In textile production, spooling is an operation in which yarns are wound from one carrier to another.
Yarn winding
The most common form is wrapping the yarn from several cops (yarn tubes ) onto a tube with a 5–10 º conicity for weaving and knitting mills .
The tube is rotated by the friction of a winding roller, individual twine turns are not placed on the tube in parallel, but at a changing angle. In this way, each subsequent layer crosses the laid threads and a so-called cross - wound bobbin is created . This winding process is also used in electrical engineering for the manufacture of high-frequency coils. In front of the winding roller, the thread runs through a braking device with which the hardness of the winding is regulated. The cheese then has firm, smooth edges; with a tube length of 150 mm, up to 4 kg of yarn can be wound.
Silk , filaments and fine staple yarns are wound with a so-called precision winding, which ensures better cohesion of the finished bobbin. Here, with increasing bobbin diameter, the ratio between the speeds of the winding roller and the thread guide changes , as a result of which the winding angle is reduced and the bobbin becomes firmer.
Other forms of winding are also used for special purposes, for example cylindrical or conical cross-wound bobbins, disc bobbins with parallel winding, etc.
Additional devices on the winding machine
Bobbin winding is usually associated with checking and eliminating yarn defects. On newer machines, this function is almost exclusively performed by electronic cleaners (until about the middle of the 20th century, mechanical devices were used). The shape and size of the yarn flaws that are to be removed are set on the cleaner, and any thread breaks are automatically eliminated by a connected knotting device. More and more often, knotters are being replaced by splicers (a splice point is barely visible compared to the knot).
Some yarns (especially for knitted fabrics ) are paraffinized during winding . For this purpose, wax is applied to the running thread from a disc .
Automation of winding
Winding machines are built in many variations and with different equipment depending on the intended use. For example, fancy yarns dyed in small lots are wound on simple devices with a high proportion of manual work.
In contrast, fully automated winding machines are used for the mass production of cotton and mixed yarns, which form a unit with ring spinning machines . The (former) winder only controls the machine and transports finished packages for further processing.
Related production processes
Similar to winding machines work, for example
- Ball winder (for hand knitting yarn ) or
- Reel machines (strand production for yarn dyeing or bleaching)
literature
- Weaving technology. Textile fiber materials and products, weaving preparation . Employers group Gesamttextil, Frankfurt / Main 1988, ISBN 3-926685-39-5
- F. Denninger, E. Giese, H. Ostertag: Textile and Model Lexicon . Deutscher Fachverlag Frankfurt / Main 2006, ISBN 3-87150-848-9
Individual evidence
- ^ Lenzing reports (PDF) lenzing.com. Retrieved on July 13, 2010. ( Page no longer available , search in web archives )
- ↑ Think Quality - Think USTER . Archived from the original on September 27, 2007. Retrieved July 13, 2010.
- ↑ NEW TECHNIQUE FOR OPTIMISING YARN-END PREPARATION ON SPLICER, AND A METHOD FOR RATING THE QUALITY OF YARNEND ( en , PDF) autexrj.org. Archived from the original on September 28, 2007. Retrieved July 13, 2010.
- ↑ Homepage of JBF Maschinen GmbH . Archived from the original on April 4, 2005. Retrieved July 13, 2010.
- ↑ Universal reel machine type HB 500 . croon-lucke.de. Retrieved July 13, 2010.