Die-swell behavior during the short-tube flow of rubber compounds

2007 ◽  
Vol 104 (1) ◽  
pp. 70-74 ◽  
Author(s):  
Ji-Zhao Liang
Keyword(s):  
Die Swell ◽  
Tube Flow ◽  
Rubber Compounds ◽  
Short Tube

Recent Developments in Superior Processing Natural Rubber

1960 ◽  
Vol 33 (3) ◽  
pp. 810-824 ◽  
Author(s):  
H. C. Baker ◽  
R. M. Foden
Keyword(s):  
Natural Rubber ◽  
Physical Properties ◽  
Operating Conditions ◽  
Lower Percentage ◽  
Die Swell ◽  
Rubber Compounds ◽  
Recent Developments ◽  
Efficient Processing ◽  
And Control

Abstract SP rubbers give greater latitude in extrusion and calendering processes by extending the range of operating conditions and giving greater scope for compounding for good physical properties. Compounds based on SP rubbers extrude smoothly with lower die swell at lower temperatures and higher viscosities. Greater productivity is obtained through the faster screw speeds which are possible with SP rubbers in many types of compound. SP rubber compounds calender with greater conformity to gage, greater ease of handling and control of shrinkage of the calendered sheet, at temperatures 10° C lower than normal. The firmer stocks given by SP rubbers and their greater resistance to degradation on milling lead to reduced wastage of unvulcanized compound in the factory, while the stricter control of processing permitted by SP rubbers results in a lower percentage of rejected articles. Evaluation of an experimentally produced SP 90 crepe has indicated the potentialities of a concentrated form of SP rubber as a more efficient processing aid than crosslinked SBR 1009 with NR and SBR.

Back-calculation of the die swell phenomenon of rubber compounds by means of torsional rheometry

2008 ◽  
Vol 110 (1) ◽  
pp. 76-82 ◽  
Author(s):  
Herbert W. Müllner ◽  
Gerald Ernst ◽  
Josef Eberhardsteiner
Keyword(s):  
Die Swell ◽  
Rubber Compounds ◽  
Back Calculation

Influence of Processing Oil Based on Modified Epoxidized Vegetable Oil with N-Phenyl-p-Phenylenediamine (PPD) on Extrusion Process Behaviors of Natural Rubber Compounds

2015 ◽  
Vol 659 ◽  
pp. 423-427 ◽  
Author(s):  
Chalida Moojea-Te ◽  
Adisai Rungvichaniwat ◽  
Kannika Sahakaro
Keyword(s):  
Natural Rubber ◽  
Heat Generation ◽  
Extrusion Process ◽  
Die Swell ◽  
Rubber Compound ◽  
Output Rate ◽  
Extrusion Rate ◽  
Rubber Compounds ◽  
Filler Dispersion ◽  
Mooney Viscosity

Rubber processing oil based on modified epoxidized vegetable oils (m-EVO) was prepared by a reaction of epoxidized palm oil EPO) or epoxidized soybean oil (ESBO) with N-Phenyl-ρ-phenylenediamine (PPD) at a mole ratio of 1:0.5. The comparison of m-EVO with aromatic oil (Treated distillate aromatic extract, TDAE) on extrusion process behaviors (output rate, extrusion rate, screw efficiency, heat generation, die swell, extrudate appearance) of carbon black (N330) filled natural rubber (NR) compound was made. It was found that the mooney viscosity of m-EVO based natural rubber compounds are slightly higher than that of the TDAE based natural rubber compound (ML(1+4)100°C: m-ESBO 65.5±0.7; m-EPO 59.7±0.2; TDAE 56.5±1.0), which probably due to the poorer filler dispersion in the compounds. The extrusion process behaviors for output rate (g/min: m-ESBO 191.0±0.6; m-EPO 191.2±0.4; TDAE 195.5±0.6), extrusion rate (cm3/min: m-ESBO 179.6±0.6; m-EPO 183.2±0.4; TDAE 186.4±0.6) and screw efficiency (%: m-ESBO 30.8±0.6; m-EPO 31.4±0.4; TDAE 32.0±0.6). All the three compounds show similar extrusion process behaviors in which the TDAE based compounds shows a marginal higher values than the m-EVO as its lower mooney viscosity lead to a better flow. The m-EPO and m-ESBO based natural rubber compounds show very similar extrusion process behaviors. The heat generation (°C: m-ESBO 61.0±0.8; m-EPO 62.1±0.4; TDAE 63.1±1.0) and die swell (%: m-ESBO 11.0±0.7; m-EPO 11.0±0.5; TDAE 12.7±0.3) of the m-EVO based natural rubber compounds are slightly lower than those of the TDAE based natural rubber compound. As there are no significant differences in the extrusion process behaviors, with respect to extrusion process, m-EVO can be used to replace TDAE oil.

scholarly journals Rheological characterization of the die swell phenomenon of rubber compounds

2007 ◽  
Vol 26 (8) ◽  
pp. 1041-1048 ◽  
Author(s):  
Herbert W. Müllner ◽  
Josef Eberhardsteiner ◽  
Wolfgang Fidi
Keyword(s):  
Die Swell ◽  
Rheological Characterization ◽  
Rubber Compounds

scholarly journals Effects of mixing temperature on the extrusion rheological behaviors of rubber-based compounds

RSC Advances ◽  
2021 ◽  
Vol 11 (56) ◽  
pp. 35703-35710
Author(s):  
Zhongjin Du ◽  
Yu Du ◽  
Yankun Gong ◽  
Guizhi Liu ◽  
Zhuo Li ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Carbon Black ◽  
Weight Change ◽  
Die Swell ◽  
Mixing Process ◽  
Rheological Behaviors ◽  
Rubber Compounds

The carbon black dispersity and rubber molecular weight change during the mixing process were the important factors determining the die swell behavior of the rubber compounds.

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