我们单位在用中空吹塑机生产塑料瓶时,发现用标准防盗盖无法拧紧瓶口,这个问题如果不及时解决,则瓶盖不但不能起到防盗作用,而且密封性能极差,将导致塑料瓶报废。针对这种情况,我们进行了仔细分析,得知产生这种现象的原因,是由于瓶口处防盗环直径偏大所致。当防盗盖拧入时,无法顺利通过防盗环,用游标卡尺测量防盗环直径,发现实际尺寸比设计尺寸大0．30mm。而防盗环直径偏大 Our unit in the production of plastic bottles with a hollow blow molding machine and found that the standard anti-theft cap can not tighten the bottle, if this problem is not resolved in time, the cap not only can not play a role in anti-theft, and sealing performance is extremely poor, will lead to plastic bottles scrapped. In view of this situation, we conducted a careful analysis that the reason for this phenomenon is due to the bottleneck anti-theft ring diameter is too large. When the anti-theft cap screwed in, you can not pass through the security ring, with a vernier caliper to measure the diameter of the ring, found that the actual size than the design size of 0.30mm. The anti-theft ring diameter is too large