Hello;
I have to do some analysis and I've never done before and I need some tips. can you tell me what is tan delta influence on die swell and brenching. And what conclusion may I draw from the following test for EPDM.
The temperature and frequency remain constant while the instrument tests the...
Our lab tests had demonstrated that there must be connection. tests were done as follow: every 2-3 day we tried to extrude parts from the same batch of compound (every time we did MDR tests) and when the visc. was between 1,13 - 2; it was impossible to produce pipes. with visc. equal to 3 or...
No, they are not reinforced and we don't extrude it via T-head extruder.
We have an ordinary extruder with a screw designed for silicon.lenght - to -diameter ratio is 10:1.
We have a major problem with silicone contains glass fibers.
Till now we have done severals trials and non of them has given good results. Base on our results we know that in this case the properties of extruded parts (before curing) and exrtrusion itself depends on rubber viscosity. The...
I have change the speed of screw, but it seems that it works only with increasing temperature. The shrinking is within 2-3% and it's smaller than before. Thank you.
ok, I try.
one thing bothers me also: I've just compared MDR results for inner and external EPDM and the curves runs in different way. The external one has shorter T90 (time after 90% curing) than the inner one. May it cause additional stress?
and one more thing if I rise the temperature, what...
The hoses shrink after extrusion.The extrusion parametres are as follow:
temperature 70C for all zones, screw speed 10m/min, haul-off speed 9m/min, the screw is 130cm long and the diameter is 90mm.
the poliester is braided with the innner rubber layer and covered with the external one.
our production has a problem with extruded rubber hoses.
they are built with two kind of EPDM separated with poliester string. the hoses shrink about 8%.
I was assured by rubber's producent that the compound may shrink but only to 3%, poliester to 2%.
I check the process of extrusion (speed...
