How to solve the problem of leakage caused by poor tightness of syringe body

How to solve the problem of leakage caused by poor tightness of syringe body? The disposable syringe with qualified quality shall have proper matching of piston and outer sleeve When the syringe is filled with water and kept vertical, the core rod shall not move due to its own weight How to solve the problem of poor tightness of syringe body Although the disposable syringe is a leakage problem, which does not occur frequently, the standard of disposable syringe (GB / t15810-2001) also has clear provisions on this index The standard requirements are: inhale the water with nominal capacity into the syringe, use the axial pressure and lateral force specified in Table 1, and act on the core rod for 30s, There shall be no leakage at the contact part between the outer sleeve and the piston Under the negative pressure of 88kpa for 60s ± 5S, there shall be no air leakage at the contact part between the outer sleeve and the piston, and the piston and the core rod shall not be separated Solution to leakage caused by poor tightness of syringe body; 1、 The manufacturer controls the tightness of the syringe body in the production process: the matching accuracy of the disposable syringe sleeve and the rubber piston is required to be high, and the assembly is strict The production of high-precision accessories can be realized by improving the processing accuracy requirements of the injection mold and the size requirements of the rubber piston At the same time, the process requirements and the incoming acceptance procedures of the parts are strictly enforced to ensure the production stability of the parts, The accuracy is within the scope of enterprise registration standard Second, using professional laboratory testing instruments to solve the quality problems of syringe body tightness; Mfy-06 produced by Jinan Sanquan Zhongshi Experimental Instrument Co., Ltd conforms to the standard of disposable syringes (GB / t15810-2001) It has the authority of user level management and the integrity of experimental data It can realize human-computer interaction with micro printer and large touch screen Operation method of mfy-06 syringe tightness positive pressure tester: suck the syringe into the water of nominal capacity, seal the cone head hole, apply the force specified in Table 1 for 30s + 5S to the core rod, and observe the leakage Adjust the water to not less than 25% of the nominal capacity, make the cone head upward, pump the piston back, make the reference line coincide with the nominal capacity line, when the suction air from the cone head hole reaches 88kpa negative pressure, maintain for 60s + 5S, and observe whether there is leakage visually