| 摘要 |
PURPOSE:To obtain a porous resin material having a thin thickness and a complicated shape, by adding vol. ratio of 2-30% of gaseous material in a dissolved state and as homogeneous fine foams in a part of or the whole highly reactive liquid raw material in advance, and expanding it in a mold in a condition of a reduced pressure. CONSTITUTION:A gaseous material is filled in a part of the whole highly reactive liquid raw material in advance and vol. ratio 2-30% of said gaseous material is added in the above described raw material in a dissolved state and as homogeneous fine foams. The mixture is poured into a mold where a reinforcing sub-material is placed in advance and expanded in an atmosphere of an optional condition of a reduced pressure to mold integrally with the reinforcing sub-material. For example vol. ratio 20% of nitrogen is loaded in a gaseous state in liquid A of a liquid raw material for highly reactive hard urethane foam, and this mixture is mixed and stirred with liquid B and poured in a mold 20 having a thin thickness and an uneven shape. Before the pouring is started or after the pouring is completed, inside of the mold 20 is brought in a reduced pressure by acting a reduced pressure apparatus 40. In this state, the highly reactive mixture where nitrogen gas is loaded in advance in a dissolved state and as a homogeneously dispersed fine foam, is expanded and rapidly filled in the mold. Thereafter, hardening is carried out for 3min and the pressure is returned to an atmosphere pressure to carry out the mold release of a molded high density hard urethane foam base material. |
