GB/T 3903.33-2019Footwear - Test methods for insoles and insocks - Water absorption and desorption (English PDF)

4.1 Method A

4.1.1 Balance, accurate to 0.001g.

4.1.2 Square knife, cut sample is (50 +/- 1) mm x (50 +/- 1) mm. The blade edge of the die has an outward angle of about 5°, so when sampling

The knife will not damage the edges of the specimen.

4.1.3 Filter paper.

4.1.4 Distilled water.

4.1.5 Beaker or container, flat bottom, appropriate volume.

4.1.6 Vernier caliper, accurate to 0.2mm.

4.2 Method B

4.2.1 The equipment (see Figure 1) includes the following sections.

4.2.1.1 The copper drum (A) has a diameter of (120 +/- 1) mm and a width of (50 +/- 1) mm and is placed on the sample (B).

4.2.1.2 Platform (C), the upper surface is rough and there are enough holes to allow water to flow through the platform to keep the surface of the platform moist. Platform (C)

The upper surface is covered with cotton gauze.

4.2.1.3 Fixture (D), clamp the short side of the specimen (B) so that it is level on the platform (C).

4.2.1.4 Fixture (E), the other short side of the specimen is fixed to the drum, and the short side clamped is parallel to the axis of the drum. The clamp passes through the weak spring

The lines are fixed to maintain a slight tension on the sample.

4.2.1.5 Water supply equipment (F), through the platform (C), can drain excess water.

4.2.1.6 Move the shaft of the roller and reciprocate along the XX axis with a displacement of (50+/-2) mm. The midpoint of the sample is the center point and the frequency is (20+/-

1) times/min. The movement of the shaft drives the drum to reciprocate on the sample, and the degree of bending of the sample is consistent with the shape of the drum.

4.2.1.7 Apply (80 +/- 5) N of pressure to the platform, sample and drum.

Description.

A---copper drum;

B---sample;

C---platform;

D---fixture;

E---fixture;

F---water supply equipment;

G---spring.

Figure 1 Equipment for determining water absorption and desorption rate

4.2.2 Mold knife, cut the sample size (110 +/- 1) mm x (40 +/- 1) mm.

4.2.3 Balance, accurate to 0.001g.

4.2.4 stopwatch, accurate to 1s.

4.2.5 Silicone grease.

5.1 Method A

Using a square knife (4.1.2), cut the specimen from the insole or inner pad, the molded insole or the parts provided, the size is (50 +/- 1) mm x

(50 +/- 1) mm. Sampling from shoes or cut parts shall be in accordance with ISO 17709.

Perform at least 24h environmental conditioning as specified in ISO 18454.

There must be no less than two samples per group.

5.2 Method B

5.2.1 If sampling from the shoe, it is advisable to take a sample from the front of the insole in the longitudinal direction. If sampling from the sheet, it should be perpendicular to each other

The two main directions are sampled. There must be no less than two samples per group.

5.2.2 The sample is a strip specimen of (110 +/- 1) mm x (40 +/- 1) mm and shall be subjected to at least 24 h according to ISO 18454 before the test.

Environmental regulation.

5.2.3 Apply a small amount of silicone grease to the side of the specimen to prevent water from penetrating into the specimen from the edge of the specimen.

6.1 Method A

6.1.1 Determination of water absorption

The length and width of the specimen were measured using a vernier caliper (4.1.6) in millimeters to the nearest 0.2 mm. Calculate its area, denoted as A, to

Said in square meters.

Weigh the sample with a balance (4.1.1) to the nearest 0.01g, denoted M0.

The sample was placed in distilled water and subjected to environmental conditioning for 6 h as specified in ISO 18454. Take out the sample and use a filter paper to remove excess

Moisture, so that the sample no longer drip, weighed, recorded as MF.

The test temperature should be (20 +/- 2) °C.

6.1.2 Determination of desorption rate

After the completion of the step 6.1.1, the sample is subjected to an environmental adjustment for 16 h according to ISO 18454, and then weighed with a balance (4.1.1).

Recorded as MR.

6.2 Method B

6.2.1 Principle

The sample is placed on a wet platform and repeatedly bent under a certain pressure (similar to the bending motion of the insole during wear of the footwear).

6.2.2 Determination of water absorption

6.2.2.1 Weigh the sample to the nearest 0.001 g (M0).

6.2.2.2 Place the cotton gauze on the platform (C).

6.2.2.3 Place the specimen on the test equipment and place the surface in contact with the foot down on the platform (C) covering the cotton gauze. Put two short sides

They are fixed on the platform and the drum, respectively, and a force of (80 +/- 5) N is applied.

6.2.2.4 Open the inlet valve and adjust the water flow rate on the platform to 7.5 mL/min.

6.2.2.5 Start the instrument and record the start time of the test.

6.2.2.6 After the appropriate time (15 min), the water supply is stopped 1 min before the instrument is stopped.

6.2.2.7 Remove the sample and weigh it to the nearest 0.001 g.

6.2.2.8 Re-place the sample on the test equipment, open the inlet valve and continue the test. The test time was 8 h.

6.2.2.9 If the sample is taken out due to saturation of the sample before the 8h test time is over, remove it and place it in a plastic bag until

Enough time. Drying was completed for 16 h as specified in 6.2.3.

6.2.3 Determination of desorption rate

The sample was subjected to an environmental adjustment for 16 h as specified in ISO 18454, and the sample was reweighed to the nearest 0.001 g, denoted as MR.

7.1 Method A

7.1.1 Water absorption rate

Calculate the water absorption rate WA according to formula (1) in g/m2.

WA=

MF-M0

(1)

In the formula.

M0---the original mass of the sample in the dry state, the unit is gram (g);

MF---the final mass of the sample in wet state, in grams (g);

A --- The area of the sample in square meters (m2).

The result is accurate to 1 g/m2.

The result is the average of the results of the two tests.

7.1.2 Desorption rate

Calculate the desorption rate WD according to equation (2), expressed in %.

WD=

MF-MR

MF-M0x

7.2 Method B

7.2.1 Water absorption rate

Calculate the water absorption rate WA in equation (3) in g/m2.

WA=

MF-M0

(3)

In the formula.

M0---the original mass of the sample, in grams (g);

MF---the final mass of the sample, in grams (g);

A---The area of the sample, in square meters (m2).

The result is accurate to 1 g/m2.

7.2.2 Desorption rate

Calculate the desorption rate WD according to equation (4), expressed in %.

WD=

MF-MR

MF-M0x

8.1 Method A

The test report should contain the following.

a) the number of this part;

b) the results of water absorption and desorption rate, performed in accordance with 7.1.1 and 7.1.2;

c) the material and detailed description of the sample;

d) a description of the relevant sampling process;

e) test method;

f) any deviation of the test method;

g) Test date.

8.2 Method B

The test report should contain the following.

a) the number of this part;

b) the results of water absorption and desorption rate, performed in accordance with 7.2.1 and 7.2.2;

c) the material and detailed description of the sample;

d) a description of the relevant sampling process;

e) test method;

f) any deviation of the test method;

g) Test date.

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