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| (To observe the level of water repellency
of water proof finished goods) |
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A-I Method (Spray method)
Testing Procedure |
| (1) |
Prepare 3 test specimens of about 20cm
x 20cm. |
| (2) |
Fasten the test specimens securely in
the metal hoop of the water repellency tester.gif)
so that it represents a smooth wrinkle free surface and place.gif)
it face up on the tester. Adjust the metal hoop so that the center of the
spray coincide with the center of the metal hoop. |
| (3) |
Pour 250 ml of water at normal temperature
into the funnel and spray the whole quantity on the test specimen for a
period of 25 - 30 sec. |
| (4) |
Detach the metal hoop from the stand.
Confirm.gif) whether
water had penetrated to the back of the test specimen. With the face side
of the test specimen down, hold the metal hoop by one edge and tap the opposite
edge lightly once against the table. Then rotate it 180｡ and similarly tap
again once on the point previously held to remove any excess water drop. |
| (5) |
Compare the wetting of the test specimen
with a photographic rating standard.gif)
and grade it accordingly. Express water repellency as the average.gif)
of the 3 test specimen (to the nearest whole number). |
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| Notes |
| 1) |
As specified in JIS L 1092. |
| 2) |
In case of twills, seersuckers, piques
or woven fabrics of similar construction, the metal hoop should be placed
in such a way that the ribs are 45｡ to the direction of water flow. |
| 3) |
Touch the back of the test specimen by
hand to confirm whether the water had penetrated or turn the metal hoop
upside down and observe for water penetration. |
| 4) |
The relation between the appearance and
the distribution of points is as follows: |
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100 point : Indicates no wetting on the
face side.
90 point : Indicates slight wetting on the face side.
80 point : Indicates wetting on the face side at the point where the water
falls.
70 point : Indicates partial wetting on half of the face side.
50 point : Indicates wetting on the entire face side.
0 point : Indicates complete wetting on the face side. |
| 5) |
Indicate in ( ) when there is water penetration |
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| References |
| 1. Basis of Testing Methods |
| (1) |
Corporate regulations on indication of
Textile Product Quality (Ministry of International Trade and Industry notification
no. 219, 25th May 1945). |
| (2) |
JIS L 1092 "Testing Methods for Water
Resistance of Fibre Products". |
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