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Crown caps

The crown cap was invented and patented in 1892 by William Painter. It originally had 24 serrations and was 6.75 mm high. Over a hundred years have gone by since the invention and now, thanks to the introduction in the 1960s of new materials (PVC-plastisols), it has become possible to reduce the number of serrations to 21 and the cap’s height to 6mm. Ever-greater quality demands as well as environmental and health concerns led to the development in the 1980s of PVC-free granulates which are now used almost exclusively in the manufacture of crown caps. Apart from their functional advantages, such as better handling and greater application speed, sealability and tamper-resistance, the caps are an ideal way to advertise a brand’s distinctive identity.

Standard crown caps

Standard crown caps come in 2 different types of metal: tin-free and tin-plated. In terms of quality and price there is no difference between tin-free and tin-plated but they do have a slightly different appearance (tin is shinier).

Crown Caps Standard 916

Twist-off crown caps

The twist-off crown caps are made of a special metal with adhesive varnish and a granulate which, when used in conjunction with a special (threaded) bottle neck ensures a good twist action. The efficiency of the bottle threads guarantees easier opening of returnable bottles. These caps are made on the normal crown cap closure machines but the fastening ring should be adapted to a diameter of 28.4 mm in order to achieve a closure diameter of 28.6- 28.8 mm. For purposes of hygiene and for best protection against corrosion the sealed bottleneck should be rinsed or cleaned thoroughly after the filling and sealing process is complete.

Crown Cap Twist 917