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？
, @  ?5 P- X8 ~* v
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；
# `- d* k# |3 a/ A3 C& D- \7 l: T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。

5 n9 g9 r' Y6 Z. X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  :
& Y! R, z% m0 l7 c: K' U; U& T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:
( b4 `7 N5 }. m! sa) Cords shall have a thickness (smallest dimension) of 1,5 mm or more when tested according to 8.20
(cord thickness). This does not apply to ribbons.
8 K3 Q0 m* P- Z3 yb) The free length of cords (e.g. on pull-along toys) which include attachments that can form nooses shall
either:
. I% W( r9 j0 T" p  W) U& Q not exceed 220 mm when stretched by a force of (25 ± 2) N; or
# Q/ j7 t0 p9 j3 k( ] when subjected to a force of (25 ± 2) N, separate into parts not exceeding 220 mm when stretched
, |: m/ b3 J/ k4 n$ Vby a force of (25 ± 2) N. It shall be possible to join the parts together after they have been separated
1 |5 q3 V% f, p4 U* k* ewithout altering the characteristics of the joints (see Figure 10).
The free length of the cord shall be measured from the fixing point to the end of the cord or to the fixing
point on the other part of the toy. If the fixing point has the same shape or form as the cord, this part shall
be measured as a part of the entire cord (see Figure 11).
0 J: S2 q* w, ], f2 Y. v# I) X, Ic) The perimeter of any nooses on cords shall not exceed 380 mm when stretched by a force of (25 ± 2) N.
* B) _; h0 j7 F, d! ~d) Toys with self-retracting cords shall have a mechanism recoil force less than 10 N.
e) Cords intended to be fixed across cradles, cots, perambulators etc., shall not exceed 750 mm when
stretched by a force of (25 ± 2) N, and their length under these conditions shall be not more than 40 %
, m3 ?& f3 ~0 {) Llonger than their relaxed length.