History of Paper Research Materials We thank you for your
interest in our web site. If youíre here, you are either
interested in papermaking wetend chemistry or youíre curious as
to whether a Britt Jar is a object díart or a special form of
seismic aftershock. We are papermakers and the following is a
short history of the development of the Britt Jar and the
papermaking application it fulfills. The Britt Jar was developed
to study how chemicals added to the wetend system of a paper
machine effect the retention of fines solids during the
papermaking operation. Fines are the mineral and cellulose
solids (less than 76m in diameter) that pass through the forming
fabric during paper manufacture. In the late 1960ís new
retention aids (water soluble polymers that carry charge) were
being introduced to the paper industry at a phenomenal rate. At
that time the effectiveness of these retention aids was being
evaluated by either making handsheets or directly on the
papermachine. Because the handsheet is formed in a low