BS 6663-1986 Methods for determination of crimp rigidity of textured nylon yarns《变形尼龙线卷曲强度的测定方法》.pdf

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1、BRITISH STANDARD BS 6663:1986 Methods for Determination of crimp rigidity of textured nylon yarns UDC 677.072.7:677.494.675:677.014.886.017.43 BS6663:1986 This British Standard, having been prepared under the directionof the Textiles andClothing Standards Committee, was published underthe authority

2、of the BoardofBSI and comes into effect on 31 July 1986 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference TCM/24 Draft for comment 85/38628 DC ISBN 0 580 15133 6 Committees responsible for this British Standard The preparation of this British Standard

3、was entrusted by the Textiles and Clothing Standards Committee (TCM/-) to Technical Committee TCM/24 upon which the following bodies were represented: British Textile Employers Association Confederation of British Wool Textiles Limited International Wool Secretariat Man-made Fibres Producers Committ

4、ee Manchester Testing House Ministry of Defence Soap and Detergent Industry Association Society of Dyers and Colourists Society of Motor Manufacturers and Traders Limited Textile Institute Textile Research Council Amendments issued since publication Amd. No. Date of issue CommentsBS6663:1986 BSI 08-

5、1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definition 1 3 Principle 1 4 Apparatus 1 5 Test specimens 1 6 Procedure 1 7 Expression of results 2 8 Comparison of results 2 9 Test report 2 Figure 1 Crimp rigidity apparatus 4 Table 1 Total hank dtex to be used

6、with specified “light” and “heavy” weights 2 Table 2 Number of strands per hank 3BS6663:1986 ii BSI 08-1999 Foreword This British Standard has been prepared under the direction of the Textiles and Clothing Standards Committee. This method was included in the 1974 edition of BS Handbook No. 11 “Metho

7、ds of test for textiles” as a recommended method. However, due to the wide usage of this method it has been decided to publish it as a British Standard. The crimp rigidity test provides a method of measuring one important property that affects the dimensions and general characteristics of fabrics pr

8、oduced from crimped continuous filament yarn. It does not characterize the yarn completely but is a useful quality control check for throwsters and knitters. In preparing this standard the original loadings at two levels, used to stress the yarn, have been retained but they have been converted from

9、g/denier to mN/dtex. Thus the procedure and equipment are the same as in the method originally included in BS Handbook No. 11. This standard applies only to textured nylon yarns. However, consideration is being given to preparing a method for textured polyester yarns. At the time of publication of t

10、his British Standard, no corresponding International Standard exists. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immu

11、nity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the

12、 inside front cover.BS6663:1986 BSI 08-1999 1 1 Scope This British Standard describes two methods for determination of the crimp rigidity of textured nylon yarns. Method A (see 6.2) is used for nylon yarns processed by conventional twist-detwist, false-twist and stuffer box methods. Method B (see6.3

13、) is used for nylon yarns with latent crimp developed by relaxation, principally edge-crimped yarns. 2 Definition For the purposes of this British Standard the following definition applies. number of strands the number of wraps in a hank of yarn multiplied bytwo 3 Principle A force equivalent to 0.9

14、00 mN/dtex is applied by two weights to the end of a hank of yarn immersed in water. After a fixed time the force is reduced to0.0176 1)mN/dtex by removing one of the weights and after a further fixed time the reduction in length of the hank is measured. The crimp rigidity of the yarn is the reducti

15、on in length of the hank expressed as a percentage of the original length. 4 Apparatus 4.1 Stopwatch having an accuracy of 0.1 s. 4.2 Measuring cylinder, of 2 L capacity. 4.3 Crimp rigidity apparatus, as shown in Figure 1, comprising the following: a) a yarn package stand; b) a small single-arm wrap

16、 reel with a yarn tensioner and an adjustable fork at one end and a detachable diabolo hank bar, with screws for trapping the yarn, at the other; c) an adjustable rubber scale, divided by scale marks into 100 equal divisions. It is mounted on a vertical support which can be hooked on to the rim of t

17、he measuring cylinder. A screw at the top for the support enables the length of the scale to be adjusted to that of the hank wound on the winder. d) a set of hooked “heavy” weights of 150 g to500g and a set of “light” weights of 3 g to 10 g in the form of S-shaped hooks. Both sets should be accurate

18、 to within 1 % of the stated value and shall be made of brass; e) a long handled grid to manipulate the heavy weights. NOTEThe tensions specified are those developed in air, and are reduced by buoyancy. If materials other than brass are used, the tensions should be adjusted accordingly. 4.4 Laborato

19、ry wrap reel 4.5 Towel or blotting paper 4.6 Swift or other suitable apparatus to enable transference of wetted out yarn (method B) to the single-arm wrap reel 4.3 b). 5 Test specimens Two measurements on yarn from each package shall be made. NOTEYarn from any type of package may be tested. 6 Proced

20、ure 6.1 Setting up the apparatus Hook the clip of the support for the rubber scale4.3 c) over the rim of the measuring cylinder(4.2). Attach the extra support to the diabolo hank bar4.3 b) and clip the supports onto the rim of the cylinder. With the bar in this position, check that the 100 % mark on

21、 the rubber scale coincides with the top of the “V” of the diabolo. If necessary, adjust the scale using the screws on either side. Replace the hank bar on the winder. Position the two-pronged fork at the lower end of the arm of the winder so as to give an adequate hank length for normal operation w

22、ith the rubber scale. Fill the measuring cylinder with water (plus wetting agent) at 20 2 C and place the long-handled grid in the cylinder. 6.2 Method A Place the package of yarn to be tested on the stud of the baseplate of the hank winder below the yarn guide 4.3 c). Thread the yarn through the ya

23、rn tensioner 4.3 b) and adjust the tension until, on pulling the yarn through the gate, it can be observed that the crimp is just removed. Clamp the leading end of the yarn to the inner-side of the capstan of the diabolo by screwing the outer knurled knob on the hank bar. Wind a hank of yarn with a

24、number of strands calculated so that forces of0.900 mN/dtex and 0.0176 mN/dtex can be applied to each hank using the sets of hooked weights4.3 d). NOTE 1The forces and number of strands of yarns most commonly encountered are listed in Table 1 and Table 2. 1) A force of 0.0176 mN/dtex is approximatel

25、y equivalent to 0.002 g/denier. BS6663:1986 2 BSI 08-1999 Clamp the final strand to the outside of the capstan of the diabolo by tightening the inner knurled knob. Avoid backward movement of the hank bar during clamping and sever the clamped yarn so as to leave a tail of not more than 50mm. NOTE 2Ta

26、ble 1 gives resultant hank dtex to enable the specified forces to be applied when the particular “light” and “heavy” weights are used. NOTE 3Table 2 shows the number of strands per hank to be used for yarns of specified nominal dtex. Add the appropriate “light” weight (see Table 1) to the yarns form

27、ing the hank extending across the prongs of the fork at the lower end of the arm of the hank winder. Add the appropriate “heavy” weight (see Table 1) to the lower hook on the “light” weight. Remove the hank and the suspended weights by unscrewing the hank bar from the arm of the winder. Attach the e

28、xtra clip support to the hank bar and immerse the hank in the water in the measuring cylinder (4.2) by clipping the two supports over the rim of the cylinder. Start the stopwatch (4.1). Just prior to 2 min from immersing the hank, adjust the length of the rubber scale by turning the milled knob at t

29、he top of the scale support so that the 0 % mark is level with the bottom of the hank. At 2 min from the time of immersion, remove the “heavy” weight by raising the grid, causing the weight to tilt and releasing it from the S-shaped hook. After a further 2 min, read the percentage contraction (crimp

30、 rigidity) directly from the rubber scale by sighting the lower end of the hank on the scale, taking care to avoid parallax errors. Repeat the test on the second test specimen. If two values differ by more than 1%, a further test shall be made and the mean of the three results obtained. 6.3 Method B

31、 NOTEYarns with latent crimp developed by relaxation should first be pre-bulked by the procedure described below. Wind a hank on a normal wrap reel (4.4) so as to give sufficient yarn for all the required tests (approximately 30 m). Tie the hank loosely in six places and remove it from the reel. Pla

32、ce the hank in water at room temperature and raise to 75 4 C over approximately 10 min. Agitate the yarn without causing the strands to tangle and maintain it at75 4 C for 10 min. Cool slowly by allowing cold water to run into the vessel. Wrap the yarn in a towel (4.5) or place it on blotting paper

33、(4.5), and leave it to dry flat on the bench. Place the relaxed hank on a swift (4.6) and then proceed as in 6.2. 7 Expression of results Report the mean of duplicate tests or triplicate tests, if necessary (see 6.2) as the crimp rigidity of the yarn. 8 Comparison of results The results obtained fro

34、m yarns tested by method A are comparable only if the yarns have been produced by the same process. If yarns produced by different processes are to be compared, method B should be used but care should be exercised in interpreting the results since yarn properties other than crimp rigidity can influe

35、nce subsequent behaviour in fabrics. 9 Test report The test report shall contain the following details: a) the number and date of this British Standard, i.e. BS 6663:1986; b) the description of the sample tested; c) the test result expressed as in clause 7; d) the details of any deviation from the t

36、est procedures; e) the method used, i.e. A or B; f) the number of specimens tested. Table 1 Total hank dtex to be used with specified “light” and “heavy” weights Total hank “Light” weight to be added to produce a force of 0.0176 mN/dtex a “Heavy” weight to produce a force of0.900 mN/dtex a dtex g g

37、1667 2222 2778 3334 3889 4445 5000 5556 3 4 5 6 7 8 9 10 150 200 250 300 350 400 450 500 a 1 gf = 9.806 65 mN.BS6663:1986 BSI 08-1999 3 Table 2 Number of strands per hank Nominal Total nominal Strands per hank Total hank Light weight to be added (seeTable 1) dtex dtex dtex g 1/22 1/33 2/22 1/50 1/66

38、 1/78 2/50 1/110 2/66 2/66 a 2/78 1/165 2/110 1/130 3/78 4/78 2/230 22 33 44 50 66 78 100 110 132 132 156 165 220 230 234 312 460 76 50 50 44 42 36 28 20 30 42 18 20 20 22 24 18 12 1672 1650 2200 2200 2772 2808 2800 2200 3960 5544 2808 3300 4400 5060 5616 5616 5520 3 3 4 4 5 5 5 4 7 10 5 6 8 9 10 10

39、 10 a An alternative hank size which gives a nearer approximation to a figure given in Table 1.BS6663:1986 4 BSI 08-1999 Figure 1 Crimp rigidity apparatusblankBS 6663:1986 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for pre

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