Abstract: Provided is a method for preparing a spinning solution of ultra-high molecular weight polyethylene fiber, which comprises mixing a dissolved solution of ultra-high molecular weight polyethylene with a swollen solution of ultra-high molecular weight polyethylene at a weight ratio of 0.42˜2.85, to obtain a spinning solution with a content of the ultra-high molecular weight polyethylene being 10%˜15% by weight; the content of the ultra-high molecular weight polyethylene in the swollen solution of ultra-high molecular weight polyethylene is 10%˜50% by weight; and the weight ratio of the ultra-high molecular weight polyethylene in the swollen solution of ultra-high molecular weight polyethylene to the ultra-high molecular weight polyethylene in the dissolved solution of ultra-high molecular weight polyethylene is 2.5˜70.

Abstract: A control device that includes an AC voltage command determination section that determines an AC voltage command value, which is a command value of the AC voltage supplied from the DC/AC conversion section to the AC electric motor, on the basis of a target torque of the AC electric motor and a rotational speed of the AC electric motor; and a system voltage command determination section that determines a system voltage command value, which is a command value of the system voltage generated by the voltage conversion section, on the basis of the AC voltage command value and the system voltage.

Abstract: A plastic injection mold for molding a plastic article includes an upper insert and a lower insert. The upper insert and the lower insert match with each other to define an annular mold cavity in between. An annular gate communicates with the mold cavity to allow molten plastic material to flow into the mold cavity to mold the article. An annular runner is connected with the annular gate for injecting molten plastic material to the annular gate. Molten plastic material will evenly flow into the mold cavity of the plastic injection mold through the annular gate to mold the plastic article, which prevents the plastic article from being disfigured, decreasing the number of defective products and improving the product quality.

Abstract: An insert molding apparatus includes a first mold and a second mold. The first mold has at least two cavity plates which cooperatively define at least one receiving groove therebetween. At least two connecting elements each have its one end positioned in one of the at least two cavity plates while the other end passing through the other cavity plate for movably connecting the at least two cavity plates with each other. At least one elastic element is compressibly disposed between and against the cavity plates in such a manner such that the at least two cavity plates are capable of contacting with each other or separating from each other. The second mold is engaged with the first mold for compelling one of the at least two cavity plates to move toward the other cavity plate so that the at least two cavity plates are in contact with each other.

Abstract: Disclosed is a control device capable of ending strong field control in a structure that performs strong field control and square wave control on the basis of a voltage index, such as a modulation factor. A voltage waveform control unit performs PWM control when a voltage index is less than a threshold, and performs square wave control when the voltage index is equal to or greater than the threshold value. A field adjusting unit performs strong field control when the voltage index is equal to or greater than a predetermined strong field threshold value less than the square wave threshold value. A mode control unit ends the strong field control when a field adjustment command value is equal to or greater than an adjustment command threshold value determined on the basis of a target torque and a voltage/speed ratio in a direction in which field flux is strengthened.

Abstract: Disclosed is a control device capable of ending strong field control based on a voltage index, such as a modulation factor. A voltage waveform control unit performs PWM control when a voltage index indicating the magnitude of voltage command values with respect to a DC voltage is less than a predetermined square wave threshold value, and performs square wave control when the voltage index is equal to or greater than the threshold. A field adjusting unit performs strong field control on the condition that the voltage index is equal to or greater than a predetermined strong field threshold value less than the square wave threshold value. A mode control unit ends the strong field control when a rotational speed is less than a rotational speed threshold value determined on the basis of a target torque and the DC voltage.

Abstract: A plastic injection mold for molding a plastic article includes an upper insert and a lower insert. The upper insert and the lower insert match with each other to define an annular mold cavity therebetween. An annular gate communicates with the mold cavity for allowing molten plastic material to flow into the mold cavity to mold the article. An annular runner is connected with the annular gate for injecting molten plastic material to the annular gate. Molten plastic material will evenly flow into the mold cavity of the plastic injection mold through the annular gate to mold the plastic article, which prevents the plastic article from being disfigured, decreasing the defective products and improving the product quality.

Abstract: A mold structure includes a first base which has a first indention area, a first main runner spaced from the first indention area, and a plurality of first subordinate runners communicating with the first indention area and the first main runner, and a second base which has a second indention area corresponding to the first indention area, a second main runner corresponding to the first main runner, and a plurality of second subordinate runners corresponding to the first subordinate runners and communicating with the second indention area and the second main runner. A plurality of first mold cores and corresponding second mold cores is mounted to the first indention area and the second indention area, respectively. The second mold core is engaged with the first mold core to form a mold chamber communicating with a chamber formed by the first indention area and the second indention area.

Abstract: A mold apparatus includes a core having a mold cavity for molding an article and a gate for allowing molten plastics to flow into the mold cavity therefrom. An ejector pin is arranged with a distal end thereof facing and adjacent to the gate. The ejector pin is movable with respect to the gate for making the distal end thereof close the gate or depart from the gate. The mold apparatus is capable of automatically separating redundant parts from an article without burrs.

Abstract: A control device that includes an AC voltage command determination section that determines an AC voltage command value, which is a command value of the AC voltage supplied from the DC/AC conversion section to the AC electric motor, on the basis of a target torque of the AC electric motor and a rotational speed of the AC electric motor; and a system voltage command determination section that determines a system voltage command value, which is a command value of the system voltage generated by the voltage conversion section, on the basis of the AC voltage command value and the system voltage.

Abstract: An insert molding apparatus includes a first mold and a second mold. The first mold has at least two cavity plates which cooperatively define at least one receiving groove therebetween. At least two connecting elements each have its one end positioned in one of the at least two cavity plates while the other end passing through the other cavity plate for movably connecting the at least two cavity plates with each other. At least one elastic element is compressibly disposed between and against the cavity plates in such a manner such that the at least two cavity plates are capable of contacting with each other or separating from each other. The second mold is engaged with the first mold for compelling one of the at least two cavity plates to move toward the other cavity plate so that the at least two cavity plates are in contact with each other.

Abstract: An insert fastening apparatus adapted to fix an insert in an insert molding mold includes an upper module and a lower module. The upper module has an upper mating surface. The lower module has a lower mating surface defining at least one fastening groove thereon. The insert is arranged between the upper module and the lower module in the fastening groove. For the upper mating surface smoothly contacts the lower mating surface in a sealing engagement with the insert fixed in the fastening groove, the upper module and the lower module are not easy to be abraded or to form a gap and further prevent burrs formed on a finished product.

Abstract: Embodiments of a method of preparing a coated C/C composite structure comprises the steps of: providing a C/C composite structure; applying a silicon based composition over the C/C composite structure by physical vapor deposition; forming a first layer comprising silicon carbide over the C/C composite by annealing the silicon based composition and the C/C composite at an annealing temperature; and applying a second layer comprising boron over the first layer by physical vapor deposition.