-
解决方案
-
橡胶毛细管流变仪的应用 Scale-up Extrudate Swell of
发布:北京仪尊时代科技有限公司浏览次数:650ABSTRACT: The relationship of extrudate swell occurring in capillary rheometer and extruder is the aim of this study. Three assumptions used are: (1) the molten polymer is sheared and given the largest deformation at the entrance of the die; (2) the retraction of an elastic part occurs during the molten flow in the die, and (3) the total retraction of the melt appears at the exit of the die. The largest deformation at the entrance of the die depends linearly onshear rate and the retraction in the die depends linearly on both shear rate and die dimensions (diameter and length), which is defined as a retraction function. Separation of these two effects on the largest deformation and the retraction function is proposed by defining a extrudate swell rate function, K as (r()2-1)/w where is the extrudate swell ratio and is the shear rate. This indicates that K is a function of shear rate, die dimension and melt properties, similar to the retraction function. Extrudate swell of natural rubber compounds mixed with carbon black and calcium carbonate were examined with a capillary rheometer and an extruder at processing temperature of 100°C. The die used had various sizes varying from 1.5mm 5.5 mm in diameter and 16mm 30mm in length while shear rate is varied from 1 2000s-1. The results show that the empirical extrudate swell rate function K is equal to Anwwhere n is a constant varying from 0.70 to 0.89 depending on the type of compounds and A is a constant varying from 0.5 to 0.8 depending on the die length. An agreement between the extrudate swell rate functions (K) obtained either from the capillary rheometer and or with the extruder is discovered. Therefore, extrudate swell behaviour observed in laboratory equipment as a capillary rheometer can be used to explain the behaviour in an industrial extruder.
2004-11-26上一篇:毛细管流变仪配备挤出胀大单元应用文章 An Experimental Investigation of Capillary ExtrudateSwell in Relation to Parison Swell Behavior inBlow Moldin
下一篇:熔体拉伸流变仪应用 Extensional rheometry of poly相关仪器 -
免责声明
①本网刊载上述内容,并不代表本网赞同其观点或证实其内容的真实性,不承担此类作品侵权行为的直接责任及连带责任
②若本站内容侵犯到您的合法权益,请及时告诉,我们马上修改或删除。邮箱:hezou_yiqi
-
认证会员 第 9 年
北京仪尊时代科技有限公司
认证:工商信息已核实
- 产品分类
- 品牌分类
-
仪企号
北京仪尊时代科技有限公司
-
友情链接
-
手机版开启全新的世界m.yiqi.com/zt2117/