Filter Papers: Gravity Filtration Methods and Why Pleated Filter Paper is Better Than Cone-Shaped
Filter papers are used to separate solid impurities from the liquid component of a solution. This is a filtration technique that uses gravitational force to draw the liquid through the filter paper. It is completely different from vacuum filtration. There are two main gravity filtration methods: cone-shaped folding and pleated folding. Each method has its own advantages and disadvantages, but pleated folding is generally considered more effective. So, why is pleated filter paper better than cone-shaped paper? What are the benefits of each method? Let’s explore in the article below.
Cone-Shaped Filter Paper Method
The first method is the cone-shaped filter, where the filter paper is folded into a cone shape and placed into a funnel. One disadvantage of this method is that the solvent can create a barrier between the funnel and the filter paper. This prevents air from escaping, significantly slowing down the filtration process. Moreover, if the solvent volume is large, it can completely block the filtration process.
Pleated Filter Paper Method
This method involves folding the filter paper into pleats inside the filter. The main advantage of this method is that it speeds up filtration by allowing air to pass through the sides of the pleats to balance the pressure. Additionally, pleated filter paper has a larger surface area, which allows the solvent to wet the paper more efficiently. Both factors make the pleated paper method a faster gravity filtration technique than the cone-shaped method.
Steps for Pleating Filter Paper
The steps to fold the filter paper in pleats are as follows:
- Start by folding the circular filter paper in half, then fold it into a quarter.
- Carefully fold the pleats, being sure not to press too hard into the folds as this could tear the paper.
- Continue to fold the paper to increase the number of pleats in the filter paper.
- Once done, you will have a fan-like structure.
- Finally, when you open the folded paper, the pleats will appear.
Why is Pleating Filter Paper Better Than Folding in a Cone?
There are several reasons why pleating is better than cone folding. The two main reasons are:
- Increased Surface Area: By folding the filter paper in a certain way, you maximize its surface area. A larger surface area means faster and more efficient filtration.
- Creation of Gaps Between the Filter Paper and Funnel: The pleats create gaps between the filter paper and the funnel. These spaces act as channels for the solvent to flow through after passing through the filter paper. This significantly increases the flow rate of the solvent through the filter paper, especially with finer filters.
Conclusion:
After reading this article, customers can easily choose the best filter paper folding method for optimal filtration efficiency. Cường Thịnh Chemical and Scientific Equipment Co., Ltd. is a leading company in importing directly from the manufacturer Advantec (Japan). We are committed to providing high-quality filter papers at the most competitive prices on the market. We will always accompany you on your journey to success.
