<div dir="ltr"><div class="gmail_default" style="font-size:small">John, what another useful recollection!</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">So the process was indeed what it always looked like -- sort of a manual version of the molded pulp pieces used in packaging (especially egg cartons). </div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">It's not at all obvious why it took them two years to find an alternative to isinglass (glue made from fish swim bladders). Seems even in those days that would have been about a week's work given the material choices available (casein/milk protein, soya protein, synthetic latex/SBR/PVaC/acrylic, polyvinyl alcohol/PVOH, and probably a half dozen more. If they'd come to my lab -- even in the late 1970s, when I was starting in polymer science and technology, this woulda been a doddle.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">But then, for Prestfibre to be using that process at all indicates that they weren't a leading-edge-of-change group.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Keep those stories coming. And Happy New Year!</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">-- Don</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Dec 31, 2022 at 7:08 AM John Macartney <<a href="mailto:johnbmacartney@gmx.com">johnbmacartney@gmx.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
I have very vivid memories at age 16 of going with my Dad to a UK company called Prestfibre and watching the tunnels and instrument panels for Herald and TR being made. <br>
The solution of mashed paper, cardboard was spread over a male former made of perforated zinc and then the ‘goop’ was covered by another inside shape former to which pressure and heat was applied. Thirty seconds later a sort of tunnel or panel was pulled off the inner former and placed in a pile alongside to cool. What stands out most in my memory was the stink of raw fish as fish glue formed a large part of the ‘goop’ mixture. Unfortunately the fish odour lingered around each assembly for many months and made the cars in which they were later fitted to stink of fish as well!<br>
It took a very long time - at least two years - for Prestfibre to find an alternative glue whi ch didn’t stink of fish and while the cars themselves no longer smelled of fish, the durability of those ‘goop’ fabricated items were by no means as long lasting. I guess that’s why y’all are considering alternatives?<br>
<br>
Jonmac<br>
<br>
Sent from a piece of electronic papyrus I found in King Tut’s tomb<br>
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