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Thank you for you attention rconner. I read these threads before but my problem is a litte different. According to the some articles, yes there is a difference between the therotical and experimental ring stiffness resuts but after pipe is burried. However, my problem occur before burried. It is...

Hi friends, I am working in plastic pipe test lab. I try to explain my problem. In spiral sewage plastic pipes, ring stiffness is most important parameter. According to the DIN 16961, elasticity modulus of HDPE at 24h (380MPa) and moment of inertia are used to determine ring stiffness value...

Hi friends, I am working in plastic pipe test lab. I try to explain my problem. In spiral sewage plastic pipes, ring stiffness is most important parameter. According to the DIN 16961, elasticity modulus of HDPE at 24h (380MPa) and moment of inertia are used to determine ring stiffness value...

Hi Friends, I need to information about PE100 pipe repairing methods. Could you give any source such as video or pdf. at internet. Thank you so much

Yes, polymer melt conduct pressure transducer in the reservoir.

I am sure that velocity of piston don't change during the test because piston is mounted a tensile/compression machine. Only force values are changing in the machine screen. :(

Hi MikeHalloran My test system like a capillary rheometer which is used to determine polymer melt behaviour in the processing conditions and I use a pressure transducer to read the pressure in the reservoir.

Thank you BigInch but my problem is a bit different. I know non-newtonian flows viscosity change with shear rate values but in this test system piston speed is constant and pressure transducer read continuosly different pressure value at same point not different point.

Hi Friends, Could you give some information about this problem. I work on polymer processing and I have a simple test system. This system consist of heated reservoir and a piston. Polymer is filled in reservoir and heated when is melted. then polymer flows through small hole. In this system...

Hi Friends, Could you give some information about this problem. I work on polymer processing and I have a simple test system. This system consist of heated reservoir and a piston. Polymer is filled in reservoir and heated when is melted. then polymer flows through small hole. In this system...

Hi , Could you guide me about this problem? I want to calculate max pressure in the capillary rheometer.And then I will calculate outher diameter of barrel and die for safe.But I can't find true formula for this aim.Max piston load ,barrel diameter die diameter and max-min shear rate values...

these information was useful for me.Thank you very much friends

Hi all friends, I need to learn something about finishing.Could you give some information about this sentence ? " The bore should be finished by techniques known to produce approximately 12rms " Thanks for your interest

Hi all friends, I need to learn something about finishing.Could you give some information about this sentence ? " The bore should be finished by techniques known to produce approximately 12rms " Thanks for your interest

Hi plastx, Firstly ,thank you very much .I have interested in this area resently.According to the your reply,I think that you are experienced on this area.If you give permission,I want to ask a question. I will calculate viscosity and other parameters of polymers without using a software.So my...

Thank you so much "plastx" :).Your reply was usefull for me.

Hi, Could you give some information that How can I measure die swell diameter without using laser sensor.? Could you advise an apparatus for this aim? Thanks a lot

Hi, I will study with a capillary rheometer for learning rheological properties of some polymers.But I don't know this system very well.I read some article and some books about capillary rheometer.And I didn't understand some point. For example ,why polymers seems melt fracture properties at...

Hi, I will study with a capillary rheometer for learning rheological properties of some polymers.But I don't know this system very well.I read some article and some books about capillary rheometer.And I didn't understand some point. For example ,why polymers seems melt fracture properties at...