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International Journal of Innovation and Scientific Research
ISSN: 2351-8014
 
 
Saturday 08 August 2020

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In Press: Vertically tapping significantly decreases dry rubber yield and alters physical and mechanical properties of raw rubber and vulcanizate



                 

Xian Hong Chen1, Qing Chen2, Jun Wang3, and Wei Fu Lin4

1 Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, Hainan, China
2 Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, Hainan, China
3 Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, Hainan, China
4 Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, Hainan, China

Original language: English

Received 22 May 2020

Copyright © 2020 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract


In China, harvest cost of natural rubber is high due to a declining rubber price, less favorable agroclimate, and skilled tapper labor shortage. Reduction in cost of latex harvest by tapping machine in a straight line will make rubber production more cost effective. To evaluate the feasibility of tapping in a straight line, a comparison of two tapping practices (horizontally/traditionally tapping and vertically/straightly tapping) was conducted in clone Reyan88-13. Compared with horizontally tapping, vertically tapping increases dry rubber content and Mg2+ content, significantly decreases initial latex flow velocity, dry rubber yield per cut length, reduces thiols content and Cu2+ content, and alters physical and mechanical properties of raw rubber and vulcanizate. Taken together, vertically tapping reduces tapping intensity, alters physical and mechanical properties of raw rubber and vulcanizate at the cost of less rubber latex yield.

Author Keywords: Hevea brasiliensis, horizontally tapping, vertically tapping, yield, mechanical properties.