Look at these after the tea filter paper test

China's tea culture has a long history, but when it comes to tea bags and disposable tea bags, it is a product of the fast-paced life of modern society. Because of the advantages of quantitative packaging, convenience and cleanliness, and fast brewing, tea bags have gradually formed a certain market scale of tea culture. However, in the early days of the popularity of tea bags in China, the production of tea filter paper has also been restricted by foreign technologies because the wet non-woven production process representing packaging technology has been mastered by developed countries such as the United States, Japan, Britain, France and Germany. However, today is not what it used to be. With the technological breakthroughs in the packaging industry, there are more and more excellent environmental protection, hygienic and harmless tea filter paper manufacturers. In addition to the health preservation of Chinese people and the rise of tea culture, tea bags have gradually become domestic tea. important branch of culture.

Many people may have a misunderstanding about tea bags, thinking that under the condition of the same amount of tea, the soup yield (extraction amount) of tea bags will be lower than that of loose tea, because the tea leaves are filtered by filter paper, and there may be some components that cannot pass through. Case. In fact, a large number of data show that the leaching amount of tea bags is higher than that of loose tea. That is because after the loose tea is brewed, the tea leaves may sink to the bottom of the cup, resulting in high concentration, large specific gravity, slow diffusion, and partial saturation, while the tea bag generally floats in the cup, and the tea juice can flow outward. It spreads around and leaches continuously, so the leaching amount is better than loose tea. The physical and chemical properties of modern tea filter paper have good absorptivity, permeability, and easy-diffusion paper structure, so it can not only filter tea foam effectively, but also extract tea soup much faster.

Tea filter paper is generally white paper. In order to make the brightness of the product relatively consistent, the new standard stipulates the D65 brightness index, which requires reducing the fluctuation of the color. The brightness index is generally ≥70% and adjusted to 70% to 88%. Since the tea filter paper is used for the automatic packaging of the tea bag packaging machine, the tea filter paper is subject to greater tension during the continuous operation of the packaging machine. In order to avoid breakage and damage, the product should have sufficient dry tensile strength to Adapt to the continuous and normal operation of automatic packaging machines. Therefore, in order to meet the needs of the market, the new standard has reasonably improved the tensile strength index of paper products. At the same time, considering the process control and the customer's requirements on the automatic packaging machine for tea powder, the tightness index of the tea filter paper product was re-adjusted.

According to the use of tea bags（tea bag packing machine china factory）, the tea juice extraction time is required to be short and the extraction speed is fast, and tea filter paper is used as a filter bag paper for tea bags, and its filtration performance is directly related to the tea juice extraction time and speed of tea bags. In the original standard, the "air permeability" index was used to reflect the air permeability, but according to the relevant standards in the international market, ISO 9237 air permeability (unit L/m2.s) was generally used to characterize the air permeability of paper products. The new standard changes the original "air permeability" to "air volume". Not only that, the new standard also adjusts the thickness index of non-heat-sealing filter paper to tightness, mainly because the quantitative, thickness and tightness of the product are related. If two of them are determined, the third index can be controlled. The unified control of quantitative and tightness indicators can standardize the detection and control requirements of paper products, and meet the customer's requirements for the applicability of products on the machine.

Since the relevant testing equipment is no longer in production, and the air permeability or water filtration time of the tea filter paper can characterize the filtration performance of the filter bag paper used for tea bags, the new standard cancels the water filtration time index and uses the air permeability index to represent the product. filter performance. In order to keep the paper moisture within a more reasonable range, make the physical properties of the paper more stable and the product consistency better, the new standard also adjusts the exchange moisture index and specifies the upper and lower limits of the exchange moisture. In order to ensure the quality of tea bags and avoid the quality of tea being affected by the peculiar smell of tea filter paper, the new standard also clearly proposes that the tea filter paper is required to have no peculiar smell. In addition, the new standard will also include the tea leakage test as one of the detection indicators.