摘要:
The present invention relates to polyolefin compositions comprising man-made cellulose fibers of very high modulus to improve the mechanical performance of said compositions while retaining a low density. The present invention further relates to a melt mixing process with controlled shear intensity and energy input especially suitable for the production of said compositions.
摘要:
The invention relates to a cellulosic fibre of the Lyocell type, which is characterized in that the ratio V of the strength of the fibre in the conditioned state FFk to the fibre elongation in the conditioned state Fdk amounts to 2.2 or less.
摘要:
A process for the production of cellulose fibers, comprising the following steps:(A) dissolving a cellulose-containing material in an aqueous, tertiary amine-oxide to obtain a spinnable cellulose solution;(B) spinning said cellulose solution and passing it through an aqueous precipitation bath, whereby water-containing, swollen filaments are obtained;(C) squeezing said water-containing, swollen filaments at various points, so that at least two squeezing points per millimeter of filament length on average are achieved and(D) drying said squeezed filaments to cellulose fibers, wherein squeezing is carried out using a pressure big enough so that said squeezing points produced on the filament are preserved also on the dried fibre and may be seen as color variations when observed under linearly polarized light.
摘要:
The invention is concerned with a process for the production of a solution of N-methylmorpholine-N-oxide in water, characterized by the following steps:(a) providing an aqueous solution containing N-methylmorpholine and morpholine and exhibiting a pH value of from 6.0 to 9.0, thereafter(b) treating said aqueous solution with a peroxidic oxidant to oxidize N-methylmorpholine to N-methylmorpholine-N-oxide.
摘要:
A cellulosic solution in a amine oxide and water is forced through an elongated orifice passage having a minimum length of 1000 /.mu.m and a minimum diameter along the length which is up to 150 /.mu.m so that fiber characteristics are imparted to the emerging strand which passes through an air gap of at the most 35 mm in length into the coagulating solution.
摘要:
For the removal of water from dilute aqueous solution of NMMO, N-methylmorpholine or morpholine or mixtures thereof, the solution is subjected to reverse osmosis at a pressure in excess of the osmotic pressure and probably around 40 bar and a temperature of 25.degree. C. to 75.degree. C. to form a retentate containing the amines and a permeate which is practically free from the amines. The permeate can be used as process water while the retentate can be worked up to NMMO for reuse in the cellulose solubilization process.
摘要:
The present invention relates to the use of a cellulosic staple fibre of the Lyocell type having a value of the ratio between titre (in dtex) and cutting length (in mm) of 0.10 or more as a filling fibre for blankets, cushions, pillows, mattresses or fleeces for upholstered furniture.
摘要:
Shaped cellulosic bodies and especially cellulosic fibers or filaments are produced by precipitating cellulose from a solution containing cellulose and NMMO. To allow elevated concentrations of NMMO in the precipitating bath without detriment to the properties of the fibers or filaments produced, the temperature of the precipitating bath is held at most at 0.degree. C.
摘要:
There is disclosed a process for preparing solutions of cellulose in aqueous tertiary amine oxides from a suspension of cellulose in an aqueous solution of the tertiary amine oxide by supplying heat at a reduced pressure. The suspension is transported over a heating surface, spread in layers or coats, until a homogenous solution of the cellulose has formed, which has a viscosity of between 50 and 15,000 Pas.s. Feeding of the suspension and drawing-off of the homogenous solution are carried out continuously. The solutions are prepared in an indirectly heated evacuatable vessel provided with a stirring device. The vessel is designed as a cylindrical container including a centrically mounted stirring shaft having agitators joined thereto, the radial distance of the agitators from the internal wall of the container being 20 mm at the most. There are provided an intake for the cellulose suspension in the upper part of the container and an outlet for the homogenous collulose solution in its lower end.
摘要:
A textile, in particular a blanket, preferably a quilt, comprises a bulky filling (2) embedded in a cover (1). In order to make sure that such a textile exhibits a good thermal insulation, a high moisture transit and good recyclability at low costs, both the cover (1) and the filling (2) comprise Lyocell fibres, with the cover (1) being shaped as a fleece and the filling (2) being shaped as a high-loft fleece or as fibre balls or as Lyocell fibres introduced, as if blown, into the cover (1).