Summary of processing steps
FRP flue and FRP chimney
A. Mold cleaning and preparation
After the newly ground mold is soaked in gauze, wipe the oil stain on the mold surface, remove the residue, evenly wipe a layer of barren wax, and then grind, evenly wipe the mold surface with fried noodles, apply a layer of polyvinyl alcohol release agent on the bead removal ring, and then dry to form.
b. Winding polyester film
Fix the polyester film at one end with adhesive tape to make the core rotate evenly. After winding the polyester film with equal tension, when the film is wound at the end of the mold, reduce the speed of the core to make the core and the end port of the mold flat. Cut the film with scissors, and cut the joint adhesive with adhesive tape without wrinkling the adhesive paper. Finally, the film will not wrinkle, and the film overlap width is about 20 mm.
C. Spraying resin, upper surface felt
Spray the lining resin layer evenly, without leakage, wrap the polyester felt, and then immerse the polyester felt in the resin to prevent curling. The fresh-keeping film of the polyester felt is 1/2 of the width of the polyester felt, measure with steel bar to ensure the size, and then wrap the glass fiber mesh, roll with air pressure roller, drive bubbles, and adjust the resin amount per unit area, with the resin content of 95%.
FRP flue and FRP chimney
d. Spray resin and cut short felt (or directly spray)
First, spray the inner resin layer evenly to ensure there is no leakage, wrap the short felt, then spray the resin, wrap the glass fiber mesh, and then roll to the air pressure roller to drive away the bubbles, adjust the resin amount per unit area, so that the resin content of this layer is within 73%. The short felt mesh eye is 205mm, measured with a steel bar.
After making polyester felt with lining, adjust the density of spraying yarn and the amount of spraying resin of the spray gun to ensure that the working displacement of the car and the speed of the mandrel reach an appropriate proportion. Rotate the mandrel once, and the spraying width of the spray gun is 95% appropriate. After overall spraying, wrap it with glass fiber mesh and roll it with an air roller. Grasp the foam, and the amount of resin per unit area can be controlled within 73%.
e. The inner lining is solidified into gel by infrared ray, and the thickness and quality of the inner lining are checked. The thickness of the inner lining is about 4mm or more.
f. Winding structure layer
Appropriate inner liner, design packaging layer and winding structure layer, prepare yarn and resin according to the quantity and width of yarn in the process design, adjust the curing agent control strip of the measuring instrument pump to the required level (according to the guidance formula of the structural resin in the laboratory under temperature), and soak the winding package and winding angle evenly according to the requirements of the whole winding process. The yarn shall not overlap, overlap, slide or slide. The resin content of ring winding is 42% - 45%, and that of spiral winding is 33% - 35%. The thickness of winding structure layer is the design wall thickness mm.
G. Production of external protective layer
According to the design, soak the resin, roll and extrude the bubbles of the resin, and the thickness of the external protective layer: ≥ 0.5mm.
h. Curing
Curing at room temperature, curing to proper temperature, stripping and trimming.
FRP flue and FRP chimney