Method of joining foam pattern members to form an assembly...

Details Method of joining foam pattern members to form an assembly... Method of joining foam pattern members to form an assembly...

B - Operations, Transporting

22

C

22/161

B22C 7/02 (2006.01) B22C 9/04 (2006.01) B29C 65/40 (2006.01) B29C 65/48 (2006.01)

Patent

CA 1272865

Abstract A method is disclosed for joining mating pattern members together along mateable margins to form an assembly, the pattern members being comprised of rigidized plastic foam, heat deformable at or above a temperature of about 170°F, the assembly being usable in the evaporative pattern casting process with molten metals. The method comprises: (a) applying a heat source to a supply of hot melt adhesive (such as polypropylene) to heat the adhesive to a liquid condition, the adhesive being characterized by a surface tension effective to permit the adhesive to be foamed by admixture with an inert gas, a softening temperature of 300-400°F, an inability to chemically attack the pattern members, a vaporization temperature of 500°F or less, an ability to remain in a nonsetting viscous liquid condition for at least 25-40 seconds after separation from said heating source; (b) extruding a foam bead comprised of a mixture of the adhesive and an inert gas, the foam bead having a surface temperature of 170°F or less, the bead being deposited along selected mateable margins of at least one of the pattern members; and (c) bringing the pattern members together in mating relationship to allow solidification of the adhesive.

520410

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