Using NNPB forming technology for refillable beer bottles

Dr Wenke Hu, William Slusser, Peter de Haan and Gary Smay consider the internal pressure and vertical load implications of using NNPB forming technology for refillable beer bottles.       Prior to 1970, most glass beverage containers were manufactured by the blow and blow (BB) process.

However, it became apparent that to achieve the goal of reduced glass weight, innovations in the forming process were needed for greater control of glass distribution. This led to the innovation of the narrow neck press and blow (NNPB) process(1, 2, 3, 4). Initially this technology was used to manufacture nonrefillable bottles at reduced glass weights, while continuing to meet conventional minimum thickness requirements. This was achieved through the ability of the plunger to actively position glass, creating more uniform thickness distributions for a given glass weight. Today, NNPB technology is widely used in the production of non-refillable beverage bottles throughout the worldwide glass container industry.

American Glass Research, Butler, Pennsylvania, USA tel: +1 724 482 2163 email: tbarr@agrintl.com web: americanglassresearch.com

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