posted July 06, 2005 05:38 AM               

I'm having output trouble extruding raw material into pellets.
the raw mat:chlorine,doa,eso,cz,ligalub.
The best barrel profile? 100\110\130\120\110\100\ die 155 neck 145
all deg c.Is this good?

Mixer dumping temp. 70 deg c Is this good?

(single screw)

hope u can help

posted July 06, 2005 11:01 AM               

Your post says "ldpe", but it seems you are blending PVC with plasticizers,Ca/Zn stabilizer and lubricant???
If so, your high speed blender should mix the ingredients to at least 80-85C to insure plasticizer absorbtion into PVC resin particles. Add PVC first,spin to 50C,while spinning,add Ca/Zn,DOA,ESO and spin to 65-70C,then add lubricant last and spin to 80-85C,dump into cooling mixer.

posted July 07, 2005 08:02 AM               

well,well, our mixing process could be the problem. The reason is because the zone temp. u suggest i did try, but burn pellets was the outcome.

Let me explain the mixing process:

pvc, lupolen, cz This is mixed high speed until 70deg c.

doa, eso, ligalub, atmer This is added on 70deg c and high speed mixed to 120deg c. The material is dumped into a blender to feed to screw at 75deg c.
Screw amps is 140.

Could it be that the material feeding in screw is to warm?