TECHNICAL BULLETIN #1803

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TECHNICAL BULLETIN #1803
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TECHNICAL BULLETIN #1803


DEFECT: FLANGED-FINISHES (on 'twist-off' & 'screw-cap' bottles)

This Bulletin provides detailed information on the ‘critical’ defect referred to as ‘Flanged Finish’. The defect comprises a small horizontal protrusion of glass along the outer sealing-surface, most commonly affecting ‘narrow-neck’ beer and beverage bottles. The extent to which the small ‘fin’ or flange of glass protrudes outward varies from bottle-to-bottle, so to is the extent to which it travels around the circumference of the sealing-surface. Regardless of size, the flange has a propensity to fracture when closures are removed from the bottles by consumers.

Since the 1990’s, this unforgiving ‘critical’ defect has subtly risen through the ranks of glass-manufacturing defects to become one of the most prominent in terms of its involvement in major product recalls world-wide. In this Bulletin, we discuss the emergence of the ‘flanged-finish’ defect, its devastating effects on both glass-manufacturers and beverage manufacturers alike, and recommended ‘best-practice’ procedures to ensure the defect is suitably controlled at the glass-manufacturing plant.



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The ‘TECHNICAL BULLETINS’ series of documents .....

The GLASSPLANT CONFIDENTIAL ‘Technical Bulletins’ series has been designed to provide detailed information on specific topics - but in a short, ‘easy-to-read’ format. Topics covered are wide and varied – some Bulletins providing articles of a ‘general interest’ nature, others focusing on more technical issues associated with container-glassware.

The ‘Technical Bulletins’ series will appeal to a wide range of personnel – Line-Supervisors, Production Managers, Quality Personnel, and Senior Managers. Scan the topics for items of interest, and keep a lookout for new topics that might be of assistance to your business.