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标题: 橡皮筋的en测试问题 [打印本页]

作者: caibird1111    时间: 2010-1-15 14:34
标题: 橡皮筋的en测试问题
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?( V, S5 X+ E, t3 Z, U

/ W. A& g) E0 a7 o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?( w! s8 H3 @# A( r. q
感激涕零!
作者: tassx    时间: 2010-1-15 15:30
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;' B9 G0 E: z& @7 R& V
至于mechanism recoil force,可以参考F963
作者: cjh80156179    时间: 2010-1-15 15:54
不能按ASTM 美标来测。
作者: huangecho    时间: 2010-1-15 16:48
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
作者: hewei    时间: 2010-1-15 18:54
你这个都不是绳,干嘛搞的这么复杂,
作者: 飞天鱼    时间: 2010-1-15 22:20
学习中
作者: zengyeah    时间: 2010-1-15 23:41
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 e9 N. @. T- T
# c  ~& e* t8 }- b9 f
应该将此橡皮筋当做绳索做相关测试!
作者: zengyeah    时间: 2010-1-15 23:44
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
作者: caibird1111    时间: 2010-1-16 08:54
引用第7楼zengyeah于2010-01-15 23:44发表的  :
# i' Q( ], u  V/ i2 Z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
  h0 w& {) P% {6 \* E6 n
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
作者: ediqi    时间: 2010-1-16 10:00
Cords shall conform to the following requirements:
: K. }/ }/ Q% `: X! ba) Cords shall have a thickness (smallest dimension) of 1,5 mm or more when tested according to 8.203 p% z" \7 v3 S: h! o/ q
(cord thickness). This does not apply to ribbons.* C" N9 I+ l' @7 _
b) The free length of cords (e.g. on pull-along toys) which include attachments that can form nooses shall
; W) f6 h3 Y! leither:$ H$ m1 Y# ^+ f' ?: t
 not exceed 220 mm when stretched by a force of (25 ± 2) N; or
7 y2 {4 A. N$ I) B; `0 b* G when subjected to a force of (25 ± 2) N, separate into parts not exceeding 220 mm when stretched, I8 m. t7 F! }' M
by a force of (25 ± 2) N. It shall be possible to join the parts together after they have been separated( n3 d1 h( ?5 x' R
without altering the characteristics of the joints (see Figure 10).
& F% E" `$ |6 o& A1 l# t2 [4 uThe free length of the cord shall be measured from the fixing point to the end of the cord or to the fixing: Q; T3 }$ y8 q* ^
point on the other part of the toy. If the fixing point has the same shape or form as the cord, this part shall
# ^$ Q' A3 M9 Obe measured as a part of the entire cord (see Figure 11).
, v2 {" i2 E0 D5 K) x9 r& L+ f# l* Z. mc) The perimeter of any nooses on cords shall not exceed 380 mm when stretched by a force of (25 ± 2) N.
& E: H2 c9 p. s% K- O5 D8 m* Ud) Toys with self-retracting cords shall have a mechanism recoil force less than 10 N.
9 {2 I7 w: ]" [, c' De) Cords intended to be fixed across cradles, cots, perambulators etc., shall not exceed 750 mm when
5 _8 R; L8 f# Q9 t6 nstretched by a force of (25 ± 2) N, and their length under these conditions shall be not more than 40 %
1 V* B8 x7 |* Llonger than their relaxed length.




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