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Proseal offers advice on sealing best-practice

10 September 2017

Proseal has worked alongside DuPont to run a series of ‘sealing masterclasses’ to help Sainsbury's deal more effectively with complaints about seal failures.  According to the retailer, the initiative has resulted in a double digit reduction in complaints. 

Sealing is the cause of the majority of packaging complaints, with typical issues including sealing breaches, sealing failures and even imploding seals.  Following an initial briefing from DuPont to the Sainsbury’s packaging team on the causes of sealing failures and how to avoid them, Sainsbury’s decided that its supply base would also hugely benefit from this knowledge. Sainsbury’s and DuPont therefore teamed up with Proseal to create a sealing masterclass.

The class focuses on two key aspects of sealing – polymer science and good heat seal practices.  The polymer science examines how plastic film is able to stick to the wide variety of materials used for food trays, including plastic, smooth wall foil and board, and explains how the contact time of the film to the tray and contact temperature can vary for different trays. 

Heat seal best practice looks at machine and heat seal tool design and the different nuances that need to be taken into consideration depending on the tray material.  It also focuses on the importance of good housekeeping for the machine and tooling, and details other issues on a production line that can affect seal quality.

Sainsbury’s has described the positive impact that the masterclasses have had on sealing complaints as ‘phenomenal’.  “As a business double digit complaint reduction is something that we rarely see,” said Debbie Parry, Sainsbury’s brand packaging technologist.  “The support that Proseal and DuPont have given us with these masterclasses has been very much appreciated.”


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