Hi
Usually, Aluminum ROPP caps for bottles have seven bridges.
Is the number ‘seven’ sacrosanct?
Does the umber have to be an odd number? Why?
Can we have just four bridges?
Would that pose any problem on bottle-cap sealing machine?
Thank you
K D Thakkar
Having seven bridges in aluminum ROPP caps is not a strict rule, it’s just a common design. Seven bridges give good strength and make it easy to see when the cap has been opened. Using an odd number like seven also helps the bridges break more evenly.
Some caps are made with four bridges, and that also works. But with fewer bridges, the break may not look as neat, and the band may be a bit weaker, which could make it easier to tamper with.
When it comes to the machines that seal these caps, using four bridges instead of seven usually doesn’t cause big problems. The machine may just need a few small adjustments so the cap seals tightly and breaks properly when opened.
Thank you for your response.
Are you from a ROPP cap manufacturing company?
What kind of ‘small adjustments’ will the sealing machine need.
In fact, we tried caps with four bridges and shop-floor reported breaking of one or two bridges. This didn’t sound logical, hence this question in the group.
Thanks once again
I am currently employed as a Senior Manager at my organization, where I lead quality assurance operations. Alongside this role, I also provide consultancy services, leveraging my expertise to help others to optimize their QA processes, resolve complex quality issues, and enhance regulatory compliance.
seven bridges are very close together, but four bridges are spaced far apart. When bridges are far apart, each one has to carry more pressure, which can cause them to break more easily. To fix this, we can slow down the speed / move the knives to better positions, and adjust the pressure of the rollers.