Fabric Rain test

Fabric Rain test

Spray Rating Tester Main content：

l  Development of Fabric waterproof or Rain Test     

l  Category of Fabric waterproof and Rain Test          

l  Factors influencing Fabric water permeability Properties   

l  Rain Test Instruments

l  Test Method for GOLLOWEN Rain Tester

Rain Tester

Even rainy spring, Huangmei Yu in summer, as well as the autumn rainy season ... rain moistening and nourishing the earth, but accidentally drenched it on having a hard time. Rain, everyday life has always been an inevitable problem. At the same time, taking into account people's comfort requirements, not drenched "breathable fabric" received more and more attention. With the increasing development of science and technology, social material and cultural living standards, human rain on this subject, carried out fruitful work, the emergence of many new waterproof materials or products

How to evaluate the performance of water-resistant material? what kind of test standards and methods for the development of new water-resistant product has very important significance. This article is about the Fabric Rain Performance, introduces the development of fabric waterproof water permeability, classification, and factors that affect its performance, combined GOLLOWEN rain tester, make a detailed rain explanation of the standards and methods for testing the fabric performance.

Daily three-piece kind of Rain gear	（GORE-TEX）fabric Waterproof

1. Development of Fabric Spray Rating Tester

Initial implementation of Fabric Spray Rating Tester feature is Ventile, it is 100% cotton woven fabric mainly for troop use. The principle is the fabric made by the wet cotton fiber cross-sectional area after the expansion, so that the pores between the fibers of the fabric shrink, so that the penetration of water required extremely high pressures. With the synthetic fiber denier, denier filaments of ultra-high density fabric shrinkage (more than 70,000 per square) appears, but also combines super water repellent finishing technology, these products and waterproof and breathable wearing comfort there greatly improved

Micro porous PTFE film in 1969 by the landmark R.W.Gore development, named Goretex laminate or (composite) fabric, is launched in 1971, it is waterproof and breathable fabric development process important progress. Its first-generation products to market in 1976, according to market soon and reflect the improved second-generation products to market in 1978; later have developed two types of elastic and thermal insulation products, in recent years, a new generation of products appear Gore windstopper in the market. Subsequently, the Netherlands, Japan, Britain and other relevant enterprises to develop a micro-porous or non-porous and non-porous polyurethane film co-polyester film laminated fabric, waterproof and breathable laminated fabric become the main force in the function of the product.

In the eighties, the coating technique, polyurethane represented by dry / wet process technology research and development, the development of fabric moisture functional products from a huge boost

According to the information it said that since the 1980s, waterproof fabric is rapidly increasing rapidly in the European market, with a capacity of 40 million meters, worth over 270 million pounds. Originally laminated fabrics dominate the market, in 1996; it is coated fabrics market share of 55% of the UK market which accounted for more than 30% of the European total. The D & K Consulting market research data show (1996.11 ~ 1997.7), had predicted to 2000, the Western European market of 45 million meters waterproof and breathable fabric. In addition, by the Dutch company Akzo-Nobel developed Sympatex laminated fabric market share in Western Europe of 70%, and continue to open up markets abroad.

In recent years, the domestic casual wear and casual wear fabrics used in respiratory function of laminated fabric (knitted or woven fabric and the film adhesive) or coated fabrics increased significantly

Fabric Spray Rating Tester

In fact, for the fabric waterproof fabric, there are many test instruments, such as the use of hydrostatic testing method of hydrostatic pressure tester, using the spray method to test spray water repellent performance tester, and evaluated by the test water the absorption speed automatic testing machine. However, for the rain was wetting and penetration resistance performance test fabrics generally used Spray Rating Tester.

Spray Rating Tester is used to detect a variety of textile materials, especially rainwater infiltration protection garment and textile materials and under different pressure rain, or water-repellent fabric composites. This method is applicable to any or without a water repellent finish fabric, the fabric can be used to measure the impact of water permeability, it can also be used to predict the permeability of the fabric rain. Especially suitable for measuring the penetration resistance of clothing fabric, fabric measuring water permeability or water resistance is to measure its water-repellent or water conductivity, with the actual use of different fabrics and in different ways, and to express a variety of appropriate indicators permeable fabric or waterproof

The Spray Rating Tester comprises a metal framework allowing distilled water to be sprayed through a nozzle onto a test specimen at 45° and 150mm below. The appearance of the specimen is compared against an optional photographic scale to rate.

Spray Rating Tester	Automatic water absorption rate tester

1.      GOLLOWEN Rain Tester

Rain Tester Test Principle：The tester simulates that rain horizontally impacts fabric samples mounted vertically in a stainless steel bath. Samples are backed with a standardized blotting paper which is weighed before and after each test. The rain is formed by a column of water which can be adjusted from 600mm (24in) to 2400mm (96 inches) depending on model in 300mm (12 inches) increments, applied via a standardized nozzle.  Provided water supply system with temperature controlled, including electronic temperature controller, a mixing tank and solenoid valve.

Rain Tester Test Standard：GB/T23321，AATCC 35，BS EN ISO 22958

Rain Tester Spec：（as table）

Adjustable value of water: 0.6m、0.9m、1.2m、1.5m、1.8m、2.1m、 2.4m

Nozzle hole diameter: 0.99±0.013mm

The number of nozzles holes: 13

Distance from the nozzle to the specimen: 305mm

Application: for the determination of water-repellent properties at different rain pressure fabric or composite material

Rain Tester：Rain performance test, the most commonly used for the GB / T23321, AATCC 35 and ISO 22958 standards. And GB / T 23321 modify using ISO 22958 standards, the technical content are basically the same. Hereinafter, only the GB / T23321 AATCC 35 and make comparative illustration.

1.1  GB/T23321 Textiles. Water resistance. Rain tests: Exposure to a horizontal water spray

1.1.1     Rain Tester Principle

The back with absorbent paper (known mass) of water in a sample under specified conditions spray 5min, then re-weigh the quality absorbent paper, absorbent paper was determined by increasing the quality of the experiment samples of water seep through quality

1.1.2        Rain Tester Materials

Use white absorbent paper, having a thickness of 0.7mm, a mass of about (385 ± 4.5) g / m2, absorption of (200 ± 30) %.

1.1.3        Sample 200x200mm. Presetting wet for at least 4 hours

1.1.4        Step: The absorbent paper laminated on the back of a sample held on the sample holder, absorbent paper size of 150 × 150mm and after weighing. The sample holder is fixed on a vertical rigid support, the sample is located directly on the surface and away from the spout 305mm surface position;

At a predetermined pressure head, make the test water samples oriented toward sustaining level spray 5min; After spraying, carefully remove the absorbent paper and immediately measure its quality, but fine to 0.1g; According to the test results to determine the accuracy want to get the number of samples, but not less than three.

1.1.5        Calculation Results

1.1.5.1  To increase the mass of absorbent paper 5min during the experiment as the water permeability value, calculates the average of at least three specimens. The test results mean value of a single sample or assay sample of over 5g of abbreviated as "5 + g" or "> 5g"

1.1.5.2  To draw a complete anti-permeability curve of samples based on the average permeability values measured under different pressure head. By increasing the pressure head value (starting from 610mm to 305mm as a grade increased successively) measured:

a.      the maximum pressure head of no penetration phenomenon

b.      With the increase of pressure head, fabric water permeability changes

c.       The minimum pressure head occurs "through" phenomenon, that is, osmotic pressure head when water exceeds 5g

In each test a pressure head at least three samples, calculate the average value of penetration in the pressure head

1.1.6        Rain Tester Test Report

The test report shall include the following,

a.      The standard number

b.      The number of test specimens

c.       Sample Description

d.      The humidity and atmospheric testing standard

e.      water temperature, hardness and pH values for test

f.        Details f. Any deviation from the standard

g.      test results

1.2  AATCC 35 Water Resistance: Rain Test

1.2.1        Rain Tester Principle

With a successful absorbent wrap the test sample, sprayed with water under controlled conditions 5min, absorbent paper and then weighed again to determine the amount of water leakage in the sample during the test

1.2.2        Rain Tester Materials

AATCC Textile material absorbent paper

1.2.3        Sample 200x200mm. Presetting wet for at least 4 hours

1.2.4        Step: Test sample 15.2x15.2cm, weight about 0.1g to wrap the standard, sample clamp onto them, then mounted on a vertical support frame immediately after the preparation of the sample components in the middle position of the spray in the face amount sprayer nozzle 30.5cm distance. At a temperature of 27 ± 1 ℃ with a water sprayer direction sideways facing continuous sample injection 5min. After the injection, immediately measure of its quality, but fine to 0.1g. Test three times.

1.2.5        Rain Tester Evaluation

1.2.5.1   The infiltration of water may vary depending on the increase in the amount of water absorbent paper 5min to calculate and record the average of three test samples, the results of a single test or the average of more than 5g may be abbreviated as "5 + g" or "> 5g "

1.2.5.2  To obtain a composite fabric material or fabric material complete a comprehensive amount of impermeable, sprayer nozzles must produce different stigma pressure. Stigma instrument should be changed in increments of 300mm in order to determine

a.      the maximum osmotic pressure of no penetration phenomenon

b.      With increasing pressure head, fabric seepage pressure change

c.       The minimum pressure head occurs "through" phenomenon, which is the minimum head of water penetration when more than 5g

With each test a pressure head at least three samples, calculate the average value of penetration in the pressure head

1.2.6        Report

Record the average. Such as greater than 5.0g, is reported as + 5.0g or> 5.0g

Summary: Strengthening standardization waterproofing products, pay attention to the coordination of product standards, test methods and equipment, and on the development of new high-end waterproof and fabric moisture protection  has a good performance is very important

For more details see: http://www.qinsun-lab.com/Products/Water-repellency-tester.html

You can follow as below, Qinsun Instruments Co., LTD, Address: No. 258 Banting Road, Shanghai, Zip Code: 201199

Phone: +86-21-6420 0566    Fax: +86-21-6420 0566-810     E-mail: info@qinsun-lab.com    website: www.qinsun-lab.com.