摘要:
Process for manufacturing carbon fibres, includes a first spinning step of a fibre of PAN precursor and a second oxidation/carbonization step of the fibre and the plant thereof. The spinning and oxidation/carbonization steps are performed directly in line and continuously, and hence without any stocking buffer area of a PAN precursor between the two steps. The spinning step is performed at low speed, so that the output speed from the spinning step, downstream of the stretching operations, is a speed falling within the range of the suitable processing speeds in the subsequent oxidation/carbonization step. Moreover, the spinning step is performed in a modular way on a plurality of spinning modules aligned in one or more rows, each spinning module having a productivity not above 10% of the overall productivity of the spinning step. In any individual spinning module, the fibres downstream of the spinning area follow zig-zag, rectilinear paths.
摘要:
Disclosed is aramid tire cord and a method for manufacturing the same, wherein the aramid tire cord has superior properties on initial modulus change rate, tensile strain, initial modulus and strength retention rate, wherein the initial modulus change rate is not more than 5% after the aramid tire cord is repetitively extended 10 times at 120° C. under the condition that the load corresponding to 10% of the strength at break is applied thereto. Thus, the aramid tire cord of the present invention has the most optimal modulus, optimal crystallization constant and optimal crystalline orientation constant so that the aramid tire cord is superior in its initial modulus change rate, tensile strain and initial modulus retention rate, to thereby obtain good fatigue resistance. Thus, if the aramid tire cord of the present invention is used for a tire-reinforcing material, it is possible to obtain high traveling performance by preventing the property deterioration during the high-speed traveling with repetitively-occurring sequence of high temperature and high pressure.
摘要:
Improvements are disclosed in apparatus for fluid heat-treatment of continuous multifilament yarn. These include 90* impingement jets for initiating treatment, 30* impingment jets for completing the treatment, and means for redirecting fluid against the yarn. Hot fluid passages in a manifold block are arranged to heat the block uniformly and dead air spaces in a cap member reduce heat loss.
摘要:
AN APPARATUS FOR TREATMENT OF FILAMENT IN THE RELAXED STATE WITH HOT GAS STREAM WHICH COMPRISES A HEATING CYLINDER, AN INLET PORTION FOR THE FILAMENT PROVIDED AT ONE END OF THE CYLINDER, AN OUTLET FOR THE FILAMENT PIROVIDED AT THE OTHER END, AND AN INLET FOR A SECONDARY GAS STREAM PROVIDED NEAR THE INLET PORTION, THE FILAMENT BEING JOINED
BY THE PRIMARY GAS STREAM AT THE INLET PORTION AND THEN INTRODUCED THROUGH THE INLET PORTION INTO THE CYLINDER. BY THE USE OF SUCH APPARATUS, A FILAMENT CAN BE HEAT-TREATED IN THE RELAXED STATE AT A HIGH EFFICIENCY OF OPERATION.