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？
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。

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  :
7 n; [7 l3 |* B; P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:
a) Cords shall have a thickness (smallest dimension) of 1,5 mm or more when tested according to 8.20
% f8 u+ v& k9 b% I3 _8 l(cord thickness). This does not apply to ribbons.
( O& O0 P4 A' N# a! \b) The free length of cords (e.g. on pull-along toys) which include attachments that can form nooses shall
either:
- p* |# X) j( z$ K) f! d not exceed 220 mm when stretched by a force of (25 ± 2) N; or
: Q" _* Y( @2 b; k9 T' g" ]% W. E when subjected to a force of (25 ± 2) N, separate into parts not exceeding 220 mm when stretched
by a force of (25 ± 2) N. It shall be possible to join the parts together after they have been separated
without altering the characteristics of the joints (see Figure 10).
5 Y4 H% q" k5 U! U4 NThe free length of the cord shall be measured from the fixing point to the end of the cord or to the fixing
. t+ K3 W. q( A! K' @2 [point on the other part of the toy. If the fixing point has the same shape or form as the cord, this part shall
1 H% K. ?. ]4 P, M. a+ cbe measured as a part of the entire cord (see Figure 11).
c) 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.
4 ^9 o" \- Y* Ye) Cords intended to be fixed across cradles, cots, perambulators etc., shall not exceed 750 mm when
- a. g; A/ l) {% ?1 S* _stretched by a force of (25 ± 2) N, and their length under these conditions shall be not more than 40 %
longer than their relaxed length.