| 摘要 |
Apparatus (20) for the dispersion of minute bubbles in a liquid resin material comprises high pressure tank means (21) containing a liquid resin material (M) under pressure; means for delivering (45) at least one agent such as a blowing agent or nucleating agent into the liquid resin material; means for agitating (63) the mixture of liquid resin material and the selected agent within the tank; means for shearing (60) the mixture; and control means (50) for determining the population of bubbles of the agent within the mixture and provides an output signal for controlling operation of the means for shearing, thereby altering the fineness of dispersion of the agent in the liquid resin material as desired. The present invention futher provides apparatus (60), for homogenizing the bubble population within a mixture of liquid resin material and agents such as gaseous or liquid blowing agents or nucleating agents which comprises housing means (71) having inlet means (52, 110, 112, 115) and outlet means (100, 105, 111, 112); first chamber means (95), cooperative with the inlet means for the introduction of the mixture into the housing, and at least one blade (80A); at least one additional chamber means (95C), providing at least one blade (80D) for pumping the mixture axially through the housing; and means for rotating the blades (72). A method for the dispersion of minute bubbles in a liquid resin material comprising the steps of withdrawing a quantity of the liquid resin material and an agent such as a gaseous or liquid blowing agent or nucleating agent from a supply tank; controlling the operation of means for shearing the liquid resin material and dispersed blowing agent, positioned within the supply tank, thereby affecting as desired the size and homogeneity of the bubbles of blowing agent; and, agitating the mixture of liquid resin material and dispersed blowing agent within the tank with the output from the means for shearing to obtain a uniform and homogeneous population of bubbles dispersed in the liquid resin material. Gas-filled RIM articles are produced from a liquid resin material having an open-cup specific gravity of less than about 0.45. |
