Gluing problem in small diameter paper tubes
27 January 2010
Background
This was a very similar problem to that in Case Study 4 in that it illustrates the impact of paper properties on bond development with aqueous adhesives. The tubes were suffering delamination problems after winding.
Method
Two paper samples were tested for permeability (Gurley), density, conformability (rate of change of contact area with pressure) and dynamic contact angle (DCA). The results showed that the main difference was in DCA and wettability. The paper that had given poor bonding had higher DCA values (was less wettable) and was less conformable so the setting of the adhesive was delayed. It also had a rougher surface, so the pick-up of the adhesive was greater.
Outcome
At our suggestion, the poor bonding paper was pre-heated to improve the setting rate. The method proposed for experimental purposes was a steam wallpaper stripper which, like steam showers for fluting medium in corrugating, applied heat and moisture to both warm and plasticise the paper. This apparently worked well!
See Also
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Internet and mobile computing-related technologies will have the strongest influence on the global pulp and paper industry in the period up to 2020 according to new research from Smithers Pira.
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The global corrugated board packaging market is forecast to grow to 98 million tonnes in 2015, a new study by Smithers Pira reveals. According to the study, the sector is to grow by a CAGR of nearly 5% between 2010 and 2015, with the highest expansion rates forecast in Brasil, Russia, India, China (the BRIC countries) and Poland.