TR90 material, in the glasses frame classification inside the plate or injection molding rack
TR90 is a kind of nylon material; in the eye frame are basically using injection molding, that is, the so-called "injection molding machine."
The products of the two processes have the following differences:
First, usually the injection molding frame will be in the mold with the gap at the obvious lines of traces, commonly known as sub-mold line, generally in the mirror and mirror edge of the center;
Second, because the material in the injection molding process, from hot to cold, will be in the geometric size of the larger place to produce shrink marks, control light at certain angles, it is not difficult to find these shrink marks
TR90 material, in the glasses frame classification which is a plate frame.
Calculated sheet, the injection of relatively hard, easy to break.
I am engaged in glasses for 10 years, I have to answer your question, TR90 material is also called nylon material, I can certainly tell you is injection molding rack. Plate frame glasses is the color of the existing color of the CP material plastic plate, polished by the lathe polished drum and other processes produced, the advantages of bright colors and natural color stripes will never fade, the disadvantage is the material is more brittle, easy to crack deformation. Injection molding frame glasses, is the use of plastic particles after injection molding, grinding drum polishing and other processes made of color, the advantages of fashion, fashionable, fine workmanship, the choice of material wide (with CP material TR90 material sub-feeding material just expected rubber Materials and other materials produced) which TR90 material is nylon material is better, strong and durable, tough. Distinguish between glasses and glasses, see color stripes, plate frame glasses, color stripes in the material inside. Injection molding glasses, color stripes are in appearance.
Not so classified, tr90 is nylon material model, plate frame and injection molding frame is the processing of glasses. Using tr90 material of the plate frame and injection molding rack both have
