Device and method for measuring transient moisture vapor transmission of variable density fiber plug

A technology for measuring devices and fiber plugs, which is applied in the direction of measuring devices, suspension and porous material analysis, scientific instruments, etc., can solve the problems of complex test devices, few transient test methods, and inability to measure fiber plugs, etc., to achieve repeatability and Excellent reproducibility, shortened test time, and simple installation

Active Publication Date: 2015-12-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are few transient test methods. Currently, only the dynamic vapor permeable box method (USP6119506) has been retrieved. Due to the complexity of the test device, it has not been popularized in the laboratory. In addition, this method can only test the moisture vapor transmission of a specific fiber plug (fabric) properties, but cannot measure the transient moisture vapor transmission properties of fiber plugs, let alone measure the changes in transient moisture vapor transmission properties of fiber plugs due to density changes during actual use
[0005] It can be seen that there is currently a lack of a simple device that can quickly and accurately test the transient moisture vapor transmission properties of fiber plugs under variable density conditions.

Method used

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  • Device and method for measuring transient moisture vapor transmission of variable density fiber plug
  • Device and method for measuring transient moisture vapor transmission of variable density fiber plug
  • Device and method for measuring transient moisture vapor transmission of variable density fiber plug

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] The wool fiber plug was selected for testing, the diameter of the wool was 21 μm, and the curl was 4.68 pieces / cm. Before the test, the wool fiber sample is preset for 24 hours under constant temperature and humidity conditions with a temperature of 20±0.2°C and a relative humidity of 65±5%. Put 0.3g of randomly arranged fiber plugs into the fiber plug tube 5, then fit the fiber plug tube 5 and the lower measurement cavity 4 together, place them on the groove of the force positioning device 7, and then push the tube into the measurement cavity The transom hole 34 on 3 is opened, and is suspended on the main force applying device 6, and the starting motor drives the pusher measuring chamber 3 to rise to the highest position, so that the pusher measuring chamber 3 and the fiber plug 5 are separated, and the pusher measuring chamber and the fiber plug 5 are separated. Put an airtight plastic film between the fiber plug tubes to prevent water vapor from entering the fiber p...

Embodiment 2

[0097] Select several representative fabrics of different weights and types, as shown in Table 1. Before the test, the fabric sample is preset for 24h under constant temperature and humidity conditions with a temperature of 20±0.2°C and a relative humidity of 65±5%. Cut the fabric into a circle with a diameter of 3 cm, put it on the bottom plate of the fiber plug tube 5, then clamp the fiber plug tube 5 and the lower measurement chamber 4 together, place it on the groove of the force positioning device 7, and then Open the transom hole 34 on the push tube measurement cavity 3 to make it in the open state, and hang it on the main force applying device 6, start the motor to drive the push tube measurement cavity 3 to rise to the highest position, so that the push tube measurement cavity 3 and the fiber plug The cylinder 5 is separated, and an airtight plastic film is placed between the push cylinder measurement chamber and the fiber plug cylinder to prevent water vapor from ente...

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Abstract

The invention relates to a measuring device and a measuring method for the transient wet steam transmissibility of a variable-density fiber plug and application of the device and the method. The device comprises a newly-added wet steam source which is used for directly providing stable and adjustable wet steam to a fiber plug cylinder, a humidity measuring device for accurately measuring the transient humidity of the two ends of the fiber plug, a pushing cylinder measuring cavity, the fiber plug cylinder, a lower measuring cavity, a force testing device, a positioning device, a data acquisition card connected with a measuring end, a driving control circuit, a data acquisition and processing module and a computer. The measuring method comprises the following steps: conveying wet steam with the stable humidity by a wet steam source into the pushing cylinder measuring cavity to measure initial relative humidity; then enabling the steam to enter the lower measuring cavity through the fiber plug cylinder to obtain final-state relative humidity, so as to measure the change of the relative humidity of passing gas when the density of the fiber plug changes and solve the diffusion coefficient of the wet steam and the wet resistance. The method and the device are fast in measurement, high in precision, high in repeatability and reproducibility, and simple and convenient to operate, and can be used for measuring the transient wet steam transmissibility of the variable-density fiber plug.

Description

technical field [0001] The invention relates to a measurement technique for the transient moisture transmission of variable density fiber plugs, which can be used for the measurement of the moisture diffusion coefficient and moisture resistance of various fiber plugs. Background technique [0002] At present, the test methods for the moisture vapor transmission properties of fiber plugs mainly include steady-state method and transient method. [0003] Steady-state methods mainly include cup method (ASTM-1999), evaporation cup method (BS7209), hygroscopic agent inverted cup method (ASTME96-80), sweating heat method (IS011092) and sweating copper man method (ASTMFF1291). In addition to these standard methods, there is also the DSC method (R.Indushekaretal.StudiesontestmethodsusedtomeasurewatervaportransmissionofabricsbyDSCandconventionaldishtechniques.Journalofindustrialtextiles.2005, 34 (4), 223-242.), the new fabric moisture permeability meter (fabric moisture permeability) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 于伟东宋文芳潘宁陈鲁铁
Owner DONGHUA UNIV
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