Fiber specific gravity testing method

Abstract

The present invention discloses a fiber specific gravity testing method, which comprises: (1) placing a specific gravity bottle filled with distilled water into a beaker holding distilled water, wherein the plane of the distilled water in the beaker exceeds 0.1 of the specific gravity bottle; (2) maintaining a vacuum degree of 99.5% for 0.5 h; (3) maintaining a temperature of 20 DEG C for 24 h, and then weighing to obtain a mass W1; (4) taking 20 g of fibers to be determined, soaking the fibers for 20 min with anhydrous alcohol, removing the oil agent on the fiber surface, and drying for 1 h in a 50 DEG C environment; (5) weighing the fiber mass by using an electronic balance to obtain a mass W2; (6) placing all the dried and weighed fibers into the specific gravity bottle, adding distilled water until the specific gravity bottle is filled with the distilled water, placing the specific gravity bottle into the beaker holding distilled water, making the water plane exceed 0.5 mm the bottle opening of the specific gravity bottle, placing into a vacuum pumping device, controlling the vacuum degree of 99.7%, maintaining for 12 h, placing the specific gravity bottle into a sealed tank, and stabilizing the temperature to a room temperature of 20 DEG C; and (7) calculating the density.

Description

technical field [0001] The invention relates to a method for rapidly testing fiber specific gravity. Background technique [0002] Density is an important parameter to characterize the physical properties of fibers. Its test method has always been concerned by scholars, and many explorations and researches have been carried out, and many test methods have been proposed. For example, the patent CN103091201 proposed a fiber quality analyzer. A fiber density measurement method for measuring pulp fiber particles; another example is the patent CN103323360, which proposes a method and device for measuring the density of a cellulose fiber blended product by using a density gradient method, and then calculating the fiber content. To sum up, there are currently three test methods recognized by the International Organization for Standardization and included in relevant standards: liquid displacement method, sink-float method, and density gradient column method. However, because the f...

AI Technical Summary

Problems solved by technology

In these three measurement methods, there are mainly the following problems: (1) During the experiment, the presence of air bubbles attached to the surface of the fiber and between the fiber monofilaments makes the data error larger, and how to remove the air bubbles is more troublesome. There are problems in this aspect in all test methods; (2) It is necessary to solve the influence of fiber surface tension effect and temperature change on density measurement; (3) The solution required for the immersion solution in each method must be accurately selected. The density range is required to be very large, and the resulting error is relatively large; (4) It is necessary to make a correct judgment on the suspension state of the fiber. In this process, the human error is very large, the experimental test data has a large error, and the accuracy is not high; (5) Configuration The process of the density gradient column is a very cumbersome process, because the top-to-bottom density of the configured density gradient column is not necessarily linear, the experimental process takes a long time, and there are artificial errors in the judgment of the fiber suspension state

Moreover, the sampling amount of fiber pellets is only at the milligram level, which is too small

In addition, the defoaming method for fiber pellets is also defective, and the defoaming is not complete

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