摘要:
A three-dimensional drawing device can include a housing configured for to be held in user's hand, shaped to allow manipulation of the housing like a pen, and configured to accept a strand of thermoplastic material. The drawing device has a nozzle assembly with an exit nozzle and a motor connected to a gear train that engages the strand such that rotation of the motor causes the feed stock to be extruded out of the exit nozzle to form a three-dimensional object. The motor can be controlled using a variable speed control mechanism or first and second actuators, thereby controlling movement of the strand, for example, to advance or retract the strand relative to the nozzle assembly.
摘要:
Fibers that are formed from a thermoplastic composition that contains a rigid renewable polyester and has a voided structure and low density are provided. To achieve such a structure, the renewable polyester is blended with a polymeric toughening additive in which the toughening additive can be dispersed as discrete physical domains within a continuous matrix of the renewable polyester. Fibers are thereafter formed and then stretched or drawn at a temperature below the glass transition temperature of the polyester (i.e., "cold drawn").
摘要:
Provided is a device for kneading a thermoplastic resin, the kneading device comprising: a plasticizing cylinder having a high-pressure kneading zone in which a molten resin obtained by plasticizing and melting said thermoplastic resin and a pressurized fluid are brought into contact and kneaded, and a reduced-pressure zone in which the gasified pressurized fluid is exhausted from the molten resin that has been brought into contact and kneaded with the pressurized fluid; a screw arranged inside the plasticizing cylinder in a rotatable and advanceable/retractable manner; a downstream-side seal mechanism provided between the high-pressure kneading zone and the reduced-pressure zone and blocking the communication between the high-pressure kneading zone and the reduced-pressure zone; and a reduced-pressure-zone pressure adjustment mechanism connected to the reduced-pressure zone of the plasticizing cylinder and controlling the pressure in the reduced-pressure zone when the downstream-side seal mechanism has blocked the communication between the high-pressure kneading zone and the reduced-pressure zone, said pressure adjustment mechanism controlling the pressure in the reduced-pressure zone to a pressure higher than or equal to atmospheric pressure and lower than or equal to the maximum pressure in the high-pressure kneading zone reached when the pressurized fluid is brought into contact and kneaded with the molten resin.
摘要:
The invention relates to a method for producing a film having luminescent particles, wherein a) a thermoplastic (1) and a luminescent pigment (2) containing a hydroxyalkyl terephthalate of the formula: R 1 -COO-P(OH) x -COO-R 2 , where R 1 , R 2 is an alkyl, aryl, or allyl residue having 1 to 10 C atoms, P is a phenyl ring, OH is a hydroxyl group attached to the phenyl ring, and x is a whole number from 1 to 4, are mixed and a thermoplastic mixture (3) is obtained; and b. the thermoplastic mixture (3) is homogenized at 150 ⁰C to 200 ⁰C in an extruder (4), and by way of an extrusion nozzle (12) of the extruder (4), a thermoplastic film (5) is obtained.
摘要:
A process for modifying a polymer, to obtain a polymer having a molecular weight lower than the unmodified polymer, comprises masticating a polymer in bulk form and selected from rubbery synthetic unsaturated polymers and natural rubber, using rubber mixing and masticating means at from 20 to 220°C while being exposed to, and in contact with, an atmosphere containing from 0.1 to 4% by volume of ozone.