Folding Filter Paper Chemistry

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. Very often users will fold the paper cone with the same 60 angle. Most filter papers are made on small paper machines for laboratory filters the machines may be as small as 50 cm width.

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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 filter paper chemistry.

Many conical filter funnels have an angle of about 60. 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. The filter papers may also be treated. The 60 filter paper funnel.

The paper is often crêped to improve porosity. Then it is folded again and creased to produce a quarter circle. Obtain a round piece of filter paper. Now fold it again 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. Open the filter paper as shown on the right and place it in the funnel. Fold it in half as shown on the right.

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