The reason waste plastic recycling machine production warping, distortion defects and solutions.
Published:2015-01-04 10:01:31    Text Size:【BIG】【MEDIUM】【SMALL
waste plastic recycling machine production warping, distortion defect causes and solutions
Injection products warping, distortion is very difficult problem. Mainly from mold design to address, and adjust the effect of molding conditions is very limited. Warping, distortion causes and solutions may refer to the following items:
① When the condition is caused by the residual stress caused by deformation of the molding, and the mold temperature can improve the uniformity and temperature of the resin or a method using an annealing stress relief by reducing the injection pressure, mold temperature.
② releasing stress and deformation caused by bad, it can be solved by increasing the number or area of the putter, stripping slope and other methods.
③ due to improper cooling method, resulting in uneven cooling or insufficient cooling time, adjust the cooling method and the extension of the cooling time. For example, the cooling circuit may be provided near the place where the deformation as much as possible.
④ For the deformation caused by mold shrinkage, it is necessary to revise the design of the mold. Among them, the most important thing is to be noted so that the wall thickness is consistent. Sometimes, in the last resort, and only by measuring the deformation of products, in the opposite direction trimming die, to be corrected. Usually the crystalline resin [such as polyoxymethylene (POM), nylon (PA), polypropylene (PP), polyethylene (PE) and polyethylene terephthalate (PET), etc.] than noncrystalline resin [e.g. polymethyl methacrylate (PMMA), poly ethylene gas (PVC), polystyrene (PS), ABS resin and AS resin and the like] of large deformation. Further, since the glass fiber reinforced resin having fibers regiospecific, deformation is also large.