Abstract In manufacturing pressed boards, a flowable mixture of thermosetting resinous material and filler is blown through one or more nozzles into a converging throat formed by a pair of relatively inclined perforated conveyor bands in which the mixture is compacted into a continuous, coherent but preferably still pliable web by the application of heat to preset the resinous material thereof. The web may be immediately converted into a rigid board by being led, without intermediate cooling, into a continuously working press for final condensation of the resin; on the way to that press it may be subjected to a finishing operation, as by adhesion of preheated strips of paper or other coverings to its still tacky surfaces.
In a method of making pressed boards, the steps comprising: continuously blowing a mixture of filler particles coated with thermosetting resin into a space between converging perforated conveyor belts and compacting said particles in said space; orienting said particles upon their entry into said space by vibrating said belts adjacent an entrance to said space; and preheating a carrier gas, used for said blowing, sufficiently to partially cure said resin.
Claim 2
Dependent Claim
70 words
In a method of making pressed boards, the steps comprising: continuously blowing a mixture of filler particles coated with thermosetting resin into a space between converging perforated conveyor belts and compacting said particles in said space; orienting said particles upon their entry into said space by vibrating said belts adjacent an entrance to said space; and preheating a carrier gas, used for said blowing, sufficiently to partially cure said resin.
Claim 3
Dependent Claim
17 words
A method as defined in claim 1 wherein said mixture is blown generally horizontally into said throat.
Claim 4
Dependent Claim
44 words
A method as defined in claim 1 wherein the step of compacting is followed by a separate step of compressing said web to final thickness, further comprising the step of at least maintaining the temperature of said web between the compacting and compressing steps.
Claim 5
Dependent Claim
25 words
A method as defined in claim 3, comprising the further step of applying a surface covering to said web between said compacting and compressing steps.
Claim 6
Dependent Claim
34 words
A method as defined in claim 4 wherein the maintenance of the web temperature between said compacting and compressing steps is achieved by preheating said surface covering before applying same to the web surface.