摘要:
The invention relates to a tape comprising a plurality of sheathed continuous multifilament strands, wherein each of the sheathed continuous multifilament strands comprises a core that extends in the longitudinal direction and a polymer sheath which intimately surrounds said core, wherein each of the cores comprises an impregnated continuous multifilament strand comprising at least one continuous glass multifilament strand, wherein the at least one continuous glass multifilament strand is impregnated with an impregnating agent in an amount from 0.50 to 15.0 wt%, for example from 0.5 to 10.0 wt% or for example from 10.0 to 15.0 wt% based on the sheathed continuous multifilament strand, wherein the impregnating agent has a melting point of at least 20°C below the melting point of the thermoplastic polymer composition, has a viscosity of from 2.5 to 200cSt at 160°C, wherein the continuous glass multifilament strand comprises at most 2 wt% of a sizing composition based on the continuous glass multifilament strand and wherein the polymer sheath consists of a thermoplastic polymer composition, wherein the thermoplastic polymer composition comprises at least 60wt%, for example at least 80wt% of a thermoplastic polymer, wherein the amount of impregnated continuous multifilament strand is in the range of 10 to 70wt% based on the sheathed continuous multifilament strands and wherein the amount of polymer sheath is in the range of 30 to 90wt% based on the sheathed continuous multifilament strand and wherein the sum of the amount of impregnated continuous multifilament strand and the polymer sheath is 100wt%.
摘要:
In one embodiment, a sized carbon fiber tow can comprise: an unsized carbon fiber tow sized with a sizing agent; wherein the sized carbon fiber tow has: a) a fuzz count of less than 8 counts/20 meters; b) a sizing content of at least 0.4 wt% of the unsized carbon fiber tow; and c) drapability less than 5.5 cm. A method of preparing a sized carbon fiber tow, comprising: spreading an unsized carbon fiber tow having a surface energy of at least 70 mJ/m 2 , over a spreader unit at a throughput line speed of at least 3 meter/minute and forming spread carbon fibers; sizing the spread carbon fibers in a sizing bath at a throughput line speed of at least 3 meter/minute and forming sized carbon fibers; and drying the sized carbon fibers and forming the sized carbon fiber tow.
摘要:
A method of incorporating quantum dots into a filament for use in three-dimensional (3D) printing. The method includes dissolving polymer in a solvent, and adding quantum dots to the dissolved polymer to produce a polymer-quantum dot composite. The method further includes drying the polymer-quantum dot composite to produce a polymer-quantum dot filament.
摘要:
The invention relates to a process for coating the surface of a moving wire (50) with a thin solid polymer layer. The process includes the step of providing a deposition device (100) having two wheels that include an upper wheel (114) and a lower wheel (114') having circumferential grooves (114b, 114b') in which the two rings (110) are lodged. A predetermined contact force between the wheels (114, 114') and the wire (50) makes it possible, by friction, to rotate the wheels (114, 114') and the rings (110). The device also includes a tank (106) containing a liquid polymer solution (75). The wire (50) is conveyed at a predetermined constant speed, and the rotatable rings (110) are rotated, these conveying an amount of the liquid polymer solution (75). The process also includes the step of simultaneously creating a partial vacuum in the spaces passed through by the wire (50). The temperature of the wire (50) is increased in a heating device (400) and its temperature is maintained by a temperature maintaining device (500) until the complete evaporation of the solvent is obtained.
摘要:
Procédé de fabrication de fil métallique par gainage d'un fil (60) par un mélange d'élastomères en provenance d'une extrudeuse (210) comportant un canal d'alimentation (220) d'une filière de gainage (260) à travers laquelle est amené à circuler ledit fil à une vitesse nominale préétablie Vn, caractérisé en ce qu'on varie la température de l'extrémité aval (262) de la filière de gainage pour une durée prédéterminée et indépendamment du reste de celle-ci lorsque que la vitesse mesurée de circulation Vm du fil est différente de Vn.
摘要:
The invention relates to a device and a method for impregnating filaments, wherein the filaments form a roving. The device comprises a barrel (10) having at least one groove (12) formed in circumferential direction of the barrel, an inner space formed along the centre axis of the barrel, and at least one recess (16) which forms a connection between the inner space and the groove. The recess includes a cylindrical section (16a), a conical section (16b) and a pocket section (16c). By means of said device and according to the method, a polymer material can be pressed successively from the inner space through at least the cylindrical section and the conical section into the groove to impregnate the filaments of the roving which is drawn through the groove.