In a conventional method of impregnating die-cast articles, the sealing property is not excellent due to air being dragged into the sealant. In the present invention, the dragging of air into the sealant is prevented by adjusting the pressure of the sealant storage vessel and the pressure of the impregnation vessel to substantially the same level and then flowing the sealant from the sealant storage vessel into the impregnation vessel. After impregnation, the sealant reenters the sealant storage vessel, and pressure is applied to the die-cast articles so as to remove excessive sealant from them.
A pressure vessel for use in impregnating porous articles comprising a support member for the articles, slidable between an upper position for degassing the articles and a lower position for impregnating the articles, a release mechanism operable from outside the pressure vessel to permit the support member to descend from the upper position to the lower position under gravity, and damping means at least partially within the pressure vessel for controlling descent of the support member.
The two components of the putty, one containing the accelerator and the other containing the catalyst, are placed in two separate containers under vacuo. After the preparation is complete the containers are brought first to atmospheric pressure and then to high pressure in order to favor the removal of the two materials from the containers onto the slab to be coated. The two components are then mixed on the slab forming the putty suitable for coating slabs of marble, stone and the like.
A machine for impregnating a die cast metal part with liquid impregnant comprises an impregnation chamber having liquid impregnant in a lower portion, an opening for ingress and egress of the parts being defined in a side wall of the chamber above the liquid impregnant, a door for sealing the opening, a part holder in the chamber and an elevator for positioning parts above the liquid impregnant during evacuation of the chamber and then immersing the parts in the liquid impregnant during subsequent pressurization of the chamber.
A machine for impregnating a die cast metal part with liquid impregnant comprises an impregnation chamber having liquid impregnant in a lower portion, an opening for ingress and egress of the parts being defined in a side wall of the chamber above the liquid impregnant, a door for sealing the opening, a part holder in the chamber and an elevator for positioning parts above the liquid impregnant during evacuation of the chamber and then immersing the parts in the liquid impregnant during subsequent pressurization of the chamber.
