Continuous Thread Closure Mold Types

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Unscrewing and Stripped are the two mold types used to manufacture Continuous Thread Closures. The differences occur in the molding process: when applied to a bottle finish, both function the same.

“Unscrewing” Closure Features:

• Closure has lugs around the bottom of the skirt
• Lugs enable the closure to be held in place while the “unscrewing” motion occurs, releasing the closure from the mold
• Threads continue to the top inside of the closure
• Liners are glued into the closure because the threads go to the top inside
• Mainly used for small size closures

“Stripped” Closure Features:

• No lugs on this closure – it is popped off or “stripped” from the mold
• Threads end before the top inside of the closure, creating a well area
• Liners are friction-fit inside because the well area and the threads hold the liner in place
• Mainly used for larger size closures