橡皮筋的en测试问题

caibird1111

广东安规检测
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如下面的图 绑doll头发的橡皮筋，test age：3-。做en71 part5.4 cords test，如果拉25n测厚度，0.6mm，meet不到要求；我觉得它是一个loop，不是noose，我觉得en只是对自由绳和noose有要求，所以最多只是符合5.4的a）量绳子厚度和d）自收缩绳来测mechanism recoil force。这是我的个人理解，大家觉得需不需要做5.4 c），按noose量其周长？

但是en对具体怎么测mechanism recoil force没有写出具体测法，是否按ASTM的做法？
  F7 d: X6 c2 S( v感激涕零！

tassx

从危险角度考虑，此橡皮筋的loop与带slipknot的noose都有缠绕危险，应计算其周长；
至于mechanism recoil force，可以参考F963

cjh80156179

不能按ASTM 美标来测。

huangecho

我认为只需要读厚度和周长就可以了。D)说的是回缩机构的回缩力度要求

hewei

你这个都不是绳,干嘛搞的这么复杂,

飞天鱼

学习中

zengyeah

3.7 绳索 - 一根细长的，柔软的材料，包括单纤维丝、编织和捻搓的绳、塑料纺织带、丝带及那些通常被称为线的纤维状材料。洋娃娃的单丝纤维头发不认为是绳索。
' Z9 X' X6 c' [  x8 d$ d
' U6 t0 |3 L2 z/ e- c应该将此橡皮筋当做绳索做相关测试！

zengyeah

对了  LZ    如果你看到我的留言   顺便告知：如何直接把图片粘贴到帖子   谢谢了

caibird1111

引用第7楼zengyeah于2010-01-15 23:44发表的  :
1 ^: a+ z' @; b+ B% e对了  LZ    如果你看到我的留言   顺便告知：如何直接把图片粘贴到帖子   谢谢了

哈哈，这也是我第一次在这里发贴，就是在发表的最下面有个“多个附件”，你点一下，就能添加图片了，多谢你的回复

ediqi

Cords shall conform to the following requirements:
# x. s9 C- T* Qa) Cords shall have a thickness (smallest dimension) of 1,5 mm or more when tested according to 8.20
" W( t2 ^1 E" D. b(cord thickness). This does not apply to ribbons.
b) The free length of cords (e.g. on pull-along toys) which include attachments that can form nooses shall
6 B; T8 `9 S; w: B8 W. I6 {& Jeither:
 not exceed 220 mm when stretched by a force of (25 ± 2) N; or
2 B9 _3 n' v  z# c when subjected to a force of (25 ± 2) N, separate into parts not exceeding 220 mm when stretched
/ n+ ]5 f! G7 {& P, G5 m9 ?by a force of (25 ± 2) N. It shall be possible to join the parts together after they have been separated
$ G; f$ p, H# L& V  Kwithout altering the characteristics of the joints (see Figure 10).
9 ]; o) m" q6 U' {0 k4 dThe free length of the cord shall be measured from the fixing point to the end of the cord or to the fixing
0 v) X7 s* J5 R( }4 o# }! x; q/ q; Lpoint on the other part of the toy. If the fixing point has the same shape or form as the cord, this part shall
* x  r4 d+ R; z5 Obe measured as a part of the entire cord (see Figure 11).
/ Z( `6 _* M( Ec) The perimeter of any nooses on cords shall not exceed 380 mm when stretched by a force of (25 ± 2) N.
d) Toys with self-retracting cords shall have a mechanism recoil force less than 10 N.
% F" J4 O+ f: p, R" ^% w) n, Je) Cords intended to be fixed across cradles, cots, perambulators etc., shall not exceed 750 mm when
) `( {2 A7 ?& G, s9 F: astretched by a force of (25 ± 2) N, and their length under these conditions shall be not more than 40 %
% j0 [+ ?" @: u- m3 E: k) Slonger than their relaxed length.