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Vacuum Web Coating

Blogmaster: Dr. Charles A. Bishop

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Post process problems

07

Pinhole counting

Posted by Charles Bishop on June 7, 2011
Question: I have a query on the metallised films. Does the pinhole count vary with the thickness of the film, for eg. what would be the rough estimation (in case if the studies are available) of pinhole count in a 15 micron, 20 micron and 30 micron vacuum metallised BOPP film? Is it true the higher ...

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01

Metallized or other vacuum-coated film may change with time

Posted by Charles Bishop on April 1, 2011
The fact that metalized or other vacuum coated film may change with time often appears to come as a surprise to both those doing the vacuum deposition as well as the customer too.   All too often the first time the problem appears is sometime after the vacuum deposition process and on the ...

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13

Need your help in knowing some facts about pinholes / pinwindows

Posted by Charles Bishop on December 13, 2010
Question: We have faced issue of pinholes where our internal customer has rejected three rolls of met pet due to pinholes which can be clearly seen against bright light. We rewound one of the rolls and found that there were heavy pinholes intermitently/ randomly without any specific pattern to foll...

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Blogmaster

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Dr. Charles A. Bishop

Charles is a toolmaker by trade after completing a mechanical engineering apprenticeship. He then entered University and obtained a Bachelors degree in materials engineering with a Diploma in Industrial Studies. During his final year he first started work on vacuum based research, helping develop a process for manufacturing titanium based bone implants for tendon location. He went on to obtain a Masters degree and Doctorate following further research into vacuum deposition processes. During this time and as a postgraduate he also worked as a consultant.

Charles next spent time in industry working for various divisions of ICI including polyesters, nylon, Imagedata, Flex Products Inc., and explosives as well as contributing to other projects. In 1998 he took the opportunity to return to consultancy work and set up his own company.

Charles has more than 30 years experience in vacuum deposition mainly onto flexible webs. He has regularly contributed papers to conferences and recently has edited this blog on behalf of AIMCAL as well as being one of their presenters for various webinars and the more formal Converting School courses.

Charles has also published 2 books, Vacuum deposition onto webs, films and foils and Roll-to-roll vacuum deposition of barrier coatings.