Apparatus for mixing a cement slurry with a glass fiber

A spray gun for mixing a cement slurry with glass fiber in order to produce a glass fiber reinforced-cement, said spray gun comprising:

• a body having a glass fiber supply passage formed as an innermost hollow element, one end of said passage being adapted for connection with means for cutting glass fiber and means for supplying cut glass fiber to said passage by compressed air, the other end of said passage forming a discharge opening for said cut glass fibers;
• said body having an outermost hollow element formed concentrically of said glass fiber supply passage;
• said body having a cement slurry supply passage provided in the concentric space formed between the innermost hollow element and the outermost hollow element which passage is adapted for connection to cement slurry feeding means;
• an air introduction passage formed in the outermost hollow element and communicating with said cement slurry supply passage through a plurality of air introduction holes, said outermost hollow element being adapted for connection to compressed air supply means;
• a closing element provided between the periphery of said discharge opening of the innermost hollow element and the periphery of one end of the outermost hollow element and arranged in such a manner that said closing element is perpendicular to the common axial line of said innermost and outermost hollow elements;
• and
• at least two injection holes provided in said closing element wherein each of said injection holes is inwardly inclined with respect to the direction in which the cut glass fibers flow in said glass fiber supply passage and communicating with said cement slurry supply passage so as to cause cement slurry discharged therefrom by compressed air to be directed parallel to and inwardly toward the axial line of said glass fiber supply passage and mixed with cut glass fibers discharged from the discharge opening of the glass fiber supply passage, and wherein said air introduction holes are proximate at least two diametrically opposite cement slurry injection holes.