A Comprehensive Look at PET Preform Moulds in Packaging

Thanks to the extensive research and application by scientists, right from the day when the Swedish chemist Jöns Jacob Berzelius produced the first condensed formulation of polymer in 1847 to British scientist Alexander Parkes who further developed cellulose material in 1861, moulding technology has progressed by leaps and bounds. However, the fruits of all these studies were best utilised by the American Hyatt brothers – John Wesley and Isaiah who conceptualised the maiden injection moulding machine in 1872.

Banking on these successful experiments, two German scientists Arthur Eichengrün and Theodore Becker further worked on soluble forms of cellulose acetate in 1903. These developments enabled another German chemist-cum-engineer Arthur Eichengrün to develop the first injection mould (spelt mold in the USA) press in 1919 that he patented two decades later.

The World War II lent more fillip to this technology and in 1946 American inventor James Watson Hendry designed and fabricated the first screw injection machine with better precise control over the speed of injection and the quality of articles produced. Over the next 24 years, Hendry came up with numerous versions including a gas-assisted injection moulding process, which permitted the production of complex and hollow articles that cooled quickly.

All these products evolved form injection molds found innumerable applications practically in every utility item under the sun such as automotive, medical, aerospace, consumer products, toys, plumbing, packaging, and construction. In particular, ever since polymer chemists formulated polyethylene terephthalate, PET in short, the packaging segment has witnessed great strides.

Thus today, this technique of preform moulds plays a vital role in the packaging industry and the quality of the moulded parts and end products. And this depends on the manner in which the moulds are designed and developed. In fact it is metallurgical engineering skill of a high degree that calls for a fully equipped tool room facility.

This has a great and direct bearing on improved design flexibility and also the strength and finish of manufactured parts alongside reducing production time, cost, weight and waste. For instance, a leading provider of PET packaging solutions boasts of one of the best tool rooms to design and fabricate such high quality preform moulds.

These products range from 4 to 750 grams and vary between 12 to 150 millimetres in neck sizes with cavity ratings touching the mark of 72. As for the caps and closures, the moulds range from 32 to 48 cavities. The credit for such achievements at this particular unit could be attributed to the capabilities of the design engineers. Yes, the in-house design studio here has integrated and computerised processes of product design, including analysis and simulated application of the mould.

Latest software has ensured consistency in various dimensions of the moulded products. Reportedly, efficient heat transfer and coherent cooling through technically embedded cooling channel structure and raging water flow are the hallmarks of these preform moulds.

In addition to these aspects of top quality, different companies have also been providing periodical refurbishment of the moulds for the end users as part of their turnkey services in packaging technology.

Post time: 05-12-2017