Folding Filter Paper Chemistry

Folding a piece of filter paper for insertion into a conical filter consists of a simple set of steps shown here in the six photographs below.

Folding filter paper chemistry.

The filter papers may also be treated. Now fold it again as shown on the right. Many conical filter funnels have an angle of about 60. Fold it in half as shown on the right.

Most filter papers are made on small paper machines for laboratory filters the machines may be as small as 50 cm width. Folding a filter paper cone so that it beds well down into the funnel creating a good seal when wet makes for an efficient filtration step. The 60 filter paper funnel. Obtain a round piece of filter paper.

The paper is often crêped to improve porosity. The raw materials are different paper pulps the pulp may be from softwood hardwood fiber crops mineral fibers for high quality filters dissolving pulp and mercerised pulp are used. From left to right and top to bottom one first folds the round piece of filter paper in half and creases it.