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Waterproof, moisture-permeable, waterproof, vapor-permeable, and wind-proof, breathable, dear, whether you are confused by these vocabulary words, why the jacket has excellent moisture permeability, but the actual wear process often feels sultry, moisture permeability is equal to Is it not equivalent to breathability? The air can't pass through. How can we talk about ventilation?
The term analytical moisture permeabilityThe moisture permeability of a fabric refers to the property of moisture permeating through the fabric, also called water vapor permeability, and is the heat balance ability to maintain the human body's heat production and heat dissipation when the body heats and sweats. The simple understanding is that the outside rain does not come in, and the perspiration that the human body emits is discharged through the pores of the coating and the membrane.
Water-vapor transmission rate (abbreviated as WVT, expressed in units of g/m2/24h) means that under certain standard laboratory conditions, a specific humidity difference is formed on both sides of the sample, and water vapor passes through When the sample enters the dry side, the amount of change in the weight of the moisture-permeable cup over time is measured to determine parameters such as the water vapor transmission rate of the sample.
There are two methods for moisture permeability: positive cup and inverted cup.
Positive cup method: GB/T 12704.1-2009 "Test methods for moisture permeability of textile fabrics - Part 1: Hygroscopic method"; GB/T 12704.2-2009 "Test method for moisture permeability of textile fabrics - Part 2: Evaporation method method A".
Cupping method: GB/T 12704.2-2009 "Textile fabric moisture permeability test method Part 2: Evaporation method method B".
Computer fabric permeability tester
BreathabilityThe breathability of fabrics refers to the performance of gas molecules through the fabric, resulting in air convection. It is straightforward to say that air can be directly felt through the air, which mainly affects the wearing comfort of the fabric, such as heat insulation, warmth, and transparency. Cool, and the use of fabric performance, etc., in outdoor products, usually combined with the wind function, that is, wind and breathable, in order to ensure that the fabric on the basis of wind and warm to achieve a certain rate of air permeability to enhance comfort. In outdoor textile products, it is feasible to achieve a certain degree of air permeability under the condition of blocking 4-5 winds.
Air Method Rate (Method Air Permeability): means the performance of the air through the fabric; under the specified pressure difference conditions, determine the air flow through a given area of ​​the sample in a certain period of time and calculate the air permeability. The airflow rate can be measured directly, or it can be obtained by measuring the pressure difference between the two sides of the flow aperture. This is truly breathable!
Test Standards: GB/T 5453-1997 "Determination of breathability of textile fabrics". Breathable units are expressed in mm/s or m/s.
Fabric breathability tester
The waterproof and moisture-permeable functional description is mostly used in the category of Jackets, meaning that more sweat and steam can penetrate through the fabric and keep it comfortable during exercise.
The windproof and air-permeable function descriptions are mostly applied to soft shell products, meaning that the purpose of preventing wind and warmth can be achieved by reducing the air permeability of the fabric, and the air permeability range value can be confirmed at the same time so as to achieve a balance between windproofness and comfort.
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Gas pressure reducing valve is a valve in the body of the opening of the opening and closing of regulating the flow of medium, the medium pressure is reduced, at the same time with the aid of the role of the valve after pressure adjust the opening of open-close part, keep the valve after pressure within a certain range, and the valve body or valve after the injection of cooling water, reduce the temperature of medium, the valve is called desuperheating valve to relieve stress.The characteristics of gas pressure reducing valve are that in the case of constant changes in inlet pressure, keep the outlet listening pressure and temperature value within a certain range, and this type of valve should be installed horizontally in the pipeline generally.
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