| 摘要 |
An upright mold for forming planar, thin, flexible, elastomeric liners for large modular concrete forms, to produce surface textured concrete walls and the like, includes a positive master of a flexible elastomeric material, secured to a planar, rigid backing, having normal extending, integral gasketing flanges on three sides, a modular form member having a planar surface mounted in the extending flanges, and means for temporarily securing said modular form member in sealing relation to said flanges and with its planar surface spaced a predetermined distance from the master. Liquid polyurethane precursor is poured into the mold form top side permitting trapped air in the liquid to travel to the surface of the modular form member and upwardly out the top of the mold. A small reservoir of the liquid may be maintained at the top of the mold to insure positive pressure of liquid into the mold for the complete filling of the spaces of the mold with the liquid precursor. A release coating on the master and sometimes on the modular form aids in removal of the elastomeric liner from the mold.
|
