Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
In a process of producing a shell mold or core wherein sand is coated with a phenolformaldehyde resin, said process comprising the steps of (a) reacting phenol and formaldehyde at an elevated temperature to produce a reaction product consisting essentially of hot liquid phenolformaldehyde resin having a solidification temperature above about 160° F., (b) transferring the hot liquid phenolformaldehyde resin to a mixing station while maintaining the resin at an elevated temperature to prevent solidification of the hot reaction product, (c) mixing the hot liquid phenolformaldehyde resin with preheated sand at said mixing station to coat the sand with the resin.
Claim 2
Dependent Claim
101 words
In a process of producing a shell mold or core wherein sand is coated with a phenolformaldehyde resin, said process comprising the steps of (a) reacting phenol and formaldehyde at an elevated temperature to produce a reaction product consisting essentially of hot liquid phenolformaldehyde resin having a solidification temperature above about 160° F., (b) transferring the hot liquid phenolformaldehyde resin to a mixing station while maintaining the resin at an elevated temperature to prevent solidification of the hot reaction product, (c) mixing the hot liquid phenolformaldehyde resin with preheated sand at said mixing station to coat the sand with the resin.
Claim 3
Dependent Claim
27 words
A process of coating sand as set forth in claim 1 wherein said phenol and formaldehyde are reacted at a temperature of at least about 212° F.
Claim 4
Dependent Claim
47 words
A process of coating sand as set forth in claim 1 wherein the hot liquid phenolformaldehyde resin is maintained in liquid from the time it is produced to the time it is mixed with the preheated sand, by continuously insulating the resin to minimize heat losses therefrom.
Claim 5
Dependent Claim
49 words
A process of coating sand as set forth in claim 1 wherein said phenol and formaldehyde are reacted at a reaction station that is remotely located from said mixing station, and said hot liquid phenolformaldehyde resin is transferred from said reaction station to said mixing station in insulated containers.
Claim 6
Dependent Claim
36 words
A process of coating sand as set forth in claim 1 wherein said hot liquid phenolformaldehyde resin is maintained at a temperature of at least about 250° F. until it is mixed with the preheated sand.
Claim 7
Dependent Claim
43 words
A process of coating sand as set forth in claim 1 wherein the sand is preheated to a temperature within the range of from about 220° F. to about 250° F. before the sand is mixed with the hot liquid phenol formaldehyde resin.
Claim 8
Dependent Claim
38 words
A process of coating sand as set forth in claim 1 wherein the hot liquid phenolformaldehyde resin and the preheated sand are mixed at a temperature in the range of from about 220° F. to about 250° F.
Claim 9
Dependent Claim
30 words
A process of coating sand as set forth in claim 1 wherein the amount of resin mixed with the sand at least is about 2% by weight of the sand.
Claim 10
Dependent Claim
25 words
A process as set forth in claim 1 which includes the further step of forming a shell mold or shell core from the coated sand.