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[BKARTS] Double-fan binding perfect bound books

Hi Waqar:

The definition of what a perfect bound book is a little vague and I couldn't
find a good one on the Internet. Here is how I define it: A book with a wrap
around paper cover, in which the pages are bound by reasonably flexible
adhesive, the cover is glued directly to the spine of the bound pages, and
the cover and book block are trimmed flush.

Double-fan gluing is a method of glue binding pages of many different kinds
of books, so it is not in the same family of definitions as book
construction styles.

Yes perfect bound books can be bound using double-fan gluing and I would say
you have been double fan gluing. Because the spine of the cover is stiff in
a perfect bound book, the books will not open very flat. If you are using
cold emulsion adhesive, your perfect bound book will feel similar to a
modern polyurethane bound book which allows you to bend the spine severely
and open the book fairly flat without damaging the book badly, but the spine
of the cover will soon be full of creases. Most high volume paperback novels
have been bound using polyurethane adhesive for about 10 years already. Just
check the spines of paperback novels in the library. They are completely
creased but still very much on one piece.

Mostly double-fan gluing is used to produce Hard cover or RepKover style
books which open very flat. Both these styles of books do not glue the spine
of the cover to the book block.

Marriage of double-fan gluing with cold emulsion adhesive to making perfect
bound books can be quite tricky. As such the perfect binding process wasn't
really developed for it. The cold emulsion adhesive swells the edges of the
pages more than hot melt glue. While I haven't spent lot's of time making
such a book, my recommendation is to first double fan glue the pages, clamp
the book block all the way to the bound edge, scrape off excess glue that
squeezes out immediately, let the binding glue dry for a few hours, then
independently glue the cover to the book block this time using a flat block
to press the cover onto the bound pages to prevent spine waviness.

Ben Wiens...applied energy scientist
Ben Wiens Energy Science Inc.
8-1200 Brunette Ave. Coquitlam BC V3K1G3 Canada
E-mail: ben@benwiens.com
Energy Website: http://www.benwiens.com
Read my popular web-booklet "The Future of Fuel Cells"

-----Original Message-----
I have been reading about perfect binding and was wondering how it differs
from double-fan binding? Aside from tilting the pages one way then the
other to get a bit more glue penetration, is there any difference between
double-fan and perfect (apart from the heated glue)? I have been doing some
(im)perfect bound paperbacks by hand with Aleenes's Tacky glue and I fan
both directions to get in some more. Am I an inadvertant "double-fanner"?
On a slightly tangential line during my experiments at home I'm having a
tough time getting the covers folding at the right places and fitting the
spine. Anybody care to share their techniques for getting a good fit
between the cover and book block for paperbacks?


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