What is spinning?
Spinning is the process whereby a material, usually a polymer, is shaped into a bundle of filaments, called a fiber. In order to shape a polymer into a fiber, the polymer must be brought into a processable liquid state. This can be done by melting the polymer (melt spinning), or by dissolving the polymer in a suitable solvent (solvent spinning). In the case of melt spinning, the liquid fiber-forming material is extruded through the small holes of a spinneret to produce a continuous filament fiber. The spun fibers solidify by cooling in contact with air after extrusion from the spinneret. In order to achieve the desired properties spun fiber is drawn and heat-treated. This can be done in a separate process, or directly in an integrated spin-draw-winding process.
Our pilot spinning facilities
Senbis Polymer Innovations (SPI) has a wide variety of melt spinning equipment at its disposal, including various spinning and spin-draw-winding (SDW) machines and drawing equipment. The spinning equipment varies in size from bench-scale monofilament apparatus to production-scale machines with spinning speeds up to 8.000 m/min and a mass output per spinning position up to 60 kg/hour. Auxiliary research tools include advanced equipment for the on-line measurement of filament temperatures, spin line tension measurements, yarn velocity, and birefringence measurements. There is also a system for the detection of foreign particles in the melt.
- Small-scale spinning machine
Electrically heated small-scale spinning machine used for proof-of-principle (PoP) experiments. Different types of screws are available in order to process different kinds of polymers. Extrusion temperatures up to 400 °C can be used. Round spinneret Ø60 mm. with 1 - 100 holes in various sizes. Throughput maximum 2,5 kg/hours. Winding speed usually up to 350 m/min, but the spinning machine can be adapted in order to run up to 2000 m/min.
- Small-scale monofilament spinning machine
Electrical heated small-scale spinning machine used for the Standard Filtration Test and for the production of monofilament fibers. Extrusion temperatures up to 350 °C can be used. Throughput maximum 10 kg/hours. A water bath and a cutter are available in order to make chips.
- Technical yarn spin-draw-winding (SDW) spinning machine
Dowtherm-heated spinning machine with a rectangular spinneret and a cross-flow quench. Extrusion temperatures up to 350 °C can be used. Throughput up to 50 kg/hour. Maximum winding speed up to 5000 m/min. Standard set-up draw field: godet/idler roller - steam jet - godet/idler roller - duo - godet/idler roller. The last godet can be heated (for low shrinkage yarns) or water-cooled (for high modulus yarns). It is also possible to use an additional godet for relaxation. Drawing temperatures up to 240 °C.
- Tire yarn spin-draw-winding (HSSDW) spinning machine
Dowtherm-heated spinning machine with a rectangular spinneret and a cross-flow quench. Extrusion temperatures up to 350 °C can be used. Throughput up to 80 kg/hour. Maximum winding speed up to 8000 m/min. Draw field with four duos. Drawing temperatures up to 240 °C. This spinning machine can be reconstructed to a machine with the same specifications as the technical yarn spinning machine.