Folding Filter Paper Chemistry

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. 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. Open the filter paper as shown on the right and place it in the funnel.

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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.

Folding filter paper chemistry.

Fold it in half as shown on the right. From left to right and top to bottom one first folds the round piece of filter paper in half and creases it. Many conical filter funnels have an angle of about 60. The paper is often crêped to improve porosity.

Obtain a round piece of filter paper. Most filter papers are made on small paper machines for laboratory filters the machines may be as small as 50 cm width. Now fold it again as shown on the right. The filter papers may also be treated.

The 60 filter paper funnel. Very often users will fold the paper cone with the same 60 angle. Then it is folded again and creased to produce a quarter circle.

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