摘要:
A method for producing a bonded permanent magnet, comprising: (i) incorporating a solid precursor material comprising a thermoplastic crosslinkable polymer and magnetic particles into an additive manufacturing device, wherein the crosslinkable polymer has a delayed crosslinking ability; (ii) melting the precursor material by heating it to a temperature of at least and no more than 10C above its glass transition temperature; (iii) extruding the melt through the additive manufacturing device and, as the extrudate exits from the nozzle and is deposited on a substrate as a solidified preform of a desired shape, exposing the resultant extrudate to a directional magnetic field of sufficient strength to align the magnetic particles; and (iv) curing the solidified preform by subjecting it to conditions that result in crosslinking of the thermoplastic crosslinkable polymer to convert it to a crosslinked thermoset. The resulting bonded permanent magnet and articles made thereof are also described.
摘要:
The invention relates to a method for forming a body comprising a particle structure fixated in a matrix material, comprising: - Providing an amount of particles, - Providing a viscous matrix material to include said particles, - Forming a particle structure of at least a portion of said amount of particles, - Fixating said viscous matrix so as to fixate said particle structure in the matrix material; characterized by at least a portion of said amount of particles being paramagnetic or ferromagnetic and the formation of the particle structure includes the steps of: First, the particles are provided in a mixture with the viscous matrix material, Second, the viscous mixture is subject to the magnetic field created by a Halbach array so as to form the particle assemblies, Third, the viscous mixture with the particle assemblies is subject to electric field so as to move and/or rotate the particle assemblies in the viscous matrix material. The invention also relates to a body obtained by said method, and to the use of said method in various applications.
摘要:
Composite sheets are made by calendering thin layers of magnetic compositions and bonding to a top printable layer wherein the calendered layer has thickness up to 10 mils.
摘要:
L'invention propose un dispositif de soudage (10) pour souder l'ouverture (16) d'un sac (12) plastique afin de le fermer hermétiquement, qui comporte : - une mâchoire inférieure (18) et une mâchoire supérieure (20) entre lesquelles le sac (12) est serré, - au moins un fil chauffant (22) et - des moyens de serrage (30) de la mâchoire supérieure (20) contre la mâchoire inférieure (18) qui comportent une pluralité d'éléments magnétiques (32) à aimant permanent, et dans lequel chaque élément magnétique (32) comporte un premier aimant permanent (34) fixe et un deuxième aimant permanent (36) qui est monté mobile par rapport au premier aimant permanent (34) entre une position de verrouillage dans laquelle la combinaison des champs magnétiques produits par les deux aimants permanents (34, 36) produit un champ magnétique de forte intensité au niveau de la mâchoire supérieure (20) et une position de libération dans laquelle la combinaison des champs magnétiques produit par les deux aimants permanents (34, 36) produit un champ magnétique de faible intensité au niveau de la mâchoire supérieure (20), permettant à un opérateur de désolidariser facilement les deux mâchoires après soudage du sac.
摘要:
A system and apparatus relating to connecting at least one first longitudinal periphery of at least one first magnetic sheet with at least one second longitudinal periphery of at least one second magnetic sheet by placing such first longitudinal periphery in adjacent relationship with such second longitudinal periphery; and connecting such first longitudinal periphery in adjacent relationship with such second longitudinal periphery; wherein such connecting step comprises the step of unitizing such at least one first magnetic sheet and such at least one second magnetic sheet into one unitary magnetic sheet.
摘要:
A polymer composition with a polymer matrix material and magnetic particles. The composition is selectively electro-magnetically heatable by an electrical induction energy frequency that is pulse width modulated through variable time cycles to provide controlled heating.