Mr. Qian was well aware of the huge profits in injection lenses, so he bought injection molding machine and planned to manufacture by himself. However, he recently complained miserably to Taili Plastic Machinery: the profit margin of the product is too small, and he doesn't want to continue to do it! Mr. Qian's product yield is low, mainly because of the serious shrinkage in the production process, resulting in the product can’t pass the optometry test. After checking its production and debugging process, Taili Plastic Machinery found many mistakes. Today, we'd like to share with you!