Method for forming a melt-resistant glass fiber product, and associated apparatus

A method of forming a melt-resistant glass fiber product, said method comprising:

• applying an insulating material to filiform glass fibers, by forming a wetted mixture including the filiform glass fibers and the insulating material comprising a fire-retarding solution such that the fire retarding solution coats each of the filiform glass fibers, the wetted mixture having a solids content of the fire-retarding solution dispersed therethrough, and the coating rendering the coated filiform glass fibers resistant to heat;
• de-liquefying the coated filiform glass fibers to form dry coated filiform glass fibers having a moisture content of between 0% and about 3%;
• forming a cohesive glass fiber mixture from the dry coated filiform glass fibers and a glass fiber binding agent;
• introducing a layer of a cohesive cellulose fiber mixture into a forming device between two layers of the cohesive glass fiber mixture, such that the layers are adjacent to each other;
• and
• intermixing glass and cellulose fibers at interfaces between the cohesive cellulose fiber mixture layer and each of the cohesive glass fiber mixture layers to form the adjacent layers into an integral composite sheet or board product, using the forming device.