By DAVID W. BROOKS (EDITOR) GEOFF A. GILES (EDITOR)
Offers a one-stop resource of reference for all facets of this significant zone of the packaging undefined. For packaging technologists, these excited about the layout and improvement of packaging and people liable for specifying or deciding to buy packaging.
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Extra info for Pet Packaging Technology (Sheffield Packaging Technology)
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Thermal crystallisation of amorphous PET is an alternative process to heatset, strain-induced, crystallised PET material for generating heat stable containers. However, this process results in loss of clarity and poor impact performance. It is commercially used for manufacture of ovenable trays and for crystallising necks on some hot-fill bottles. Further thermal crystallisation of already crystallised, strain-induced oriented PET, achieved in the novel heat setting process of STEP, retains the high clarity, improves the gas barrier and mechanical performance, and maintains impact resistance.
The process stages involve the injection moulding of preforms in amorphous PET. The preform is then heated to about the Tg (75 C), is wallironed by uniaxial orientation, and a dome base is formed. The stretched preform is trimmed to provide the correct length and is then flanged and reformed into a can body. The open top can body is now trimmed to a precise length in preparation to neck-in and flange to the correct diameter to take a seamed metal end (209 diameter). The finished can is a 12 oz oriented PET necked-in beverage can with a draw wall ironed (DWI) base.
By spark eroding the start of the thread, it was possible to increase the effective thread length and make the cap engage with the neck for more turns. The new profile of vent slots increased the rate of gas pressure release and, linked to the increased turns of thread, reduced the incidence of TEBO. Incidences of 'premature release' were reduced by better understanding of the maintenance of well-defined thread definition on RO (roll on) and ROPP caps. The launch of plastic prethreaded caps in the early 1980s also meant that consistent thread engagement and closure performance was assured.