Determination of Dimensional Change of Fabrics Induced by Free Steam

1. Scope of application
This International Standard specifies a method for determining the dimensional change of fabrics subjected to the action of free steam.It cannot handle the compaction and felting shrinkage of the mechanical effects of the wet treatment or pressing of the fabric.

2. References
ISO 139, Textiles – Conditioning and test standard atmospheres
ISO 3759, Textiles – Preparation, marking and measurement of fabric samples and garments for measuring dimensional change tests

3. Principle
The measured and conditioned strip fabric placed on a fine wire frame.Because their heat capacity is very low,the wire causes the condensation on the cloth to be negligible when the assembly placed in the steam.The assembly was inserted into the horizontal cylinder three times, and the steam was stably supplied from the rear of the cylinder to the door in front of the cylinder at a prescribed flow rate.Not suitable for vacuum cleaners.After removal from the cylinder, the fabric is allowed to cool on the frame before adjustment and is measured.Both the initial and final lengths recorded at the same moisture regain. The dimensional change calculatedby the initial length.The method requires the use of the conditioned atmosphere specified in Section 5,to minimize the difference between initial and final regain.

4. Instrument
4.1 Marking and measuring devices described in ISO 3759.
4.2 Appendix A predetermined wire support frame.
4.3 Jacket steam cylinders constructed and installed by Annex B.
4.4 Transfer of steam to the cylinder at a flow rate of 70 g / min.
4.5 Apparatus for the production of textile test standard atmospheres.

5. Adjust atmosphere
ISO 139 test standard for textiles is used for pre-conditioning and conditioning.

6. Test samples
6.1 Crop
6.2 Preparation
Each test sample was placed on flat gauze and preconditioned in the preconditioning atmosphere specified in Section 5 for at least 4 h.Each test sample was then exposed to the textile test atmosphere for 4 h or until equilibrium was reached, remove the sample and mark the measurement with a pair of suitable small marks on the plane (see ISO 3759) at a distance of 250 mm,symmetrically distributed on both sides of the sample central axis.Measure and record the distance between each pair of marks.
6.3 Quantity
Unless otherwise agreed by the interested parties, four longitudinal samples were run parallel to the warp and weft directions, respectively.

7. Test procedure
7.1 Ensure that the steam flow in the specified £¦#118alue of 70g / min ± 20% range, if the previous is cold (allow the steam to flow for at least 1 min or longer to completely heat the cylinder (see Appendix B).
7.2 Place the four conditioned samples flat on the wire support frame, one layer per sample.
7.3 Allowing steam throughout the trial by the cylinder;when the steam flows into the frame,And immediately closed the door.The specimens were kept in the cylinder for 30 s;Remove the frame from the cylinder after the 30s.A total of 3 cycles, in addition to the provisions of the 30s, does not allow additional time.
7.4 At the end of the third cycle,allow the sample to cool,flip the frame so that the sample falls onto a flat screen. The sample is preconditioned and conditioned on the screen as described in 6.2 and measured on a smooth plane.

8. Result calculation and expression
The size change (i.e., length variation) of each sample is recorded. A negative sign indicates a decrease in length,the change in length measured in the direction of the fabric (i.e., warp or weft) is also recorded.Recorded results are expressed as a percentage of the initial length. The average and size range of each sample was calculated.

9. Test Report
The test report shall include the following particulars:
a. The presentation of the procedure by this International Standard;
b. Sample type and source
1) The sample at the location of the end of the fabric involved.
2) The dimensional change of each sample is expressed as a percentage of the initial length.
3) The average size of the sample changes in percentage of the initial lengt.
4) Range of individual size change values.

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