2) Black stripes (yellow gas): Black or yellow stripes appear on the surface and inside of plastic parts.
3) Scratch (strain): There are straight scratches on the side of plastic parts;
4) Fog spots (lack of transparency): hazy spots or hazy areas are formed on the surface of transparent plastic parts;
5) Water ripple: the appearance defect of water ripple appears on the surface of plastic parts, especially transparent plastic parts;
6) Burr (waste edge/burr): the residual material that overflows into the gap between the grinding surfaces of the mold during injection molding and remains on the product, and is removed by trimming the mold or using a trimming knife;
7) Lack of material (lack of glue): refers to the appearance defect of the mold cavity caused by insufficient plastic filling or insufficient glue around the glue part or ribs; Increasing stress is the most direct solution.
8) Warp deformation: The distortion, collapse and deformation caused by cooling shrinkage of plastic after being released from the mold are mainly due to insufficient cooling time, which can be seriously improved by using plastic fixtures;
9) Cracking: Cracks on the surface or outside of rubber parts caused by internal stress, external force impact (top) or environmental conditions (temperature), especially transparent products, can increase the temperature of the mold and reduce the pressure increase;
10) stripe: refers to the defect of silvery white filaments on the plastic surface caused by water injection or undried raw materials;
1 1) color difference: the color of plastic parts is different from the normal standard color (signed sample color swatch) or the surface gloss of plastic parts is inconsistent;
12) weld marks: all kinds of linear marks are produced during molding, which are caused by incomplete melting when the two rubber compounds meet during injection molding, and sometimes obvious color marks are produced;
13) scorch (yellowing): due to poor exhaust of the mold (air trapped), the rubber parts are partially scorched (yellowing and blackening);
14) Top white (top explosion): white marks or crack marks are produced on the surface of rubber thimble;
15) matte color (dull surface): the local position or area of the adhesive surface is dull;
16) mixed color: the local color of the glue deviates from the original color (or appears dark);
17) dimensional deviation: the difference between the size of rubber parts and the drawing requirements or sample size;
18) peeling (peeling): the surface layer and the inner layer of the glue are separated and layered;
19) cold spot: cold lumps appear on the surface or inside the rubber parts;
Black spots: black or dark spots produced by white or transparent plastic parts;
2 1) gas line (shadow): the shadow appearing on the step surface of air inlet accessories or plastic parts;
22) concave point: a point or surface lower than the surface of the surrounding material;
23) Protrusion: a point or surface higher than the surface of the surrounding material;
24) Flower marks: small grooves appear on the surface or side of the adhesive or points or lines cut into the surface of the material;
25) Bubbles: small bubbles formed when gas enters plastic parts;
26) Oil stain: yellow-brown oil stain on the thimble or the surface of plastic parts;
27) Blind hole: a solid plastic column formed by injection molding after the column hole forming needle is broken;
28) Multi-glue: excess glue spots inside or on the surface of glue parts;
29) Luminescence: there are bright spots or bright areas on the surface of the etched plastic parts;
30) Stamping: the defect of poor quality caused by the metal insert being loaded into the mold.