Slitting machine for beverage plastic closures with tamperevident band based on  twosteps process

LUO　Da
（Hangzhou Wahaha Group Co.,Ltd.，Hangzhou 311215, China)

Abstract: In order to solve the problem of the flash between the main part and the tamperevident band of the beverage closures, and the large structure of the injection mold made by one step injection process,  the twosteps technology combined with slitting and injection was investigated. After the analysis of using mechanical slitting process to cut the closures, the relationship between the slitting machine and the tamperevident band of closure was established.A pilot slitting machine was made,  and the method of slitting the closures to form the tamperevident band after injection was brought out. Finally, the closure slitting test was carried out. The test results indicate that, not only the problem of the flash is solved completely， but also the production efficiency is doubled for the reason of simplified mold structure by getting rid of the corepulling mechanism of the mold compared with the one step injection process.
Key words: beverage closures;   mechanical slitting;  vertical machine;tamperevident band