Mainly are out of tolerance, corrugated, fluffed, blistered and uneven surface, etc.

(1) The out-of-tolerance pipe diameter is mainly because the resin content of the prepreg is too high or exceeds the standard, the soluble resin content is too low, and the melting degree is poor during rolling, which is exposed on the reinforcing material surface.

(2) The resin content and soluble resin content of the corrugated prepreg are too large or exceed the index value, the molding time of the epoxy adhesive is too long, and the glue accumulates during rolling to form corrugation, bubbling, and even cracking.

(3) The reasons for layering and layering are mainly: the material in the aging section of the prepreg is not removed, and the prepreg with low resin content and soluble resin value is rolled into the blank of the laminated tube; or the prepreg Insufficient arc segments wrapped on the hot roller, coupled with the fact that the ventilation system above the rolling machine is not activated or the air volume is insufficient, it is difficult to remove volatiles.

(4) The surface of the tube is fluffy and not smooth. Before dipping the paint, the inner and outer surfaces of the laminated tube should be trimmed to make them smooth; at the same time, the impregnating paint used should be filtered in time to remove impurities; the impregnating material frame should be regularly removed. Subs and paint clots.