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XLPE EHV Screen Packs
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12 years 11 months ago #494 by Archived Forum Admin
XLPE EHV Screen Packs was created by Archived Forum Admin
XLPE Screen Packs for EHV Insulation
Could someone please let me know what they are using for insulation extruder screen packs for extra-high voltage extrusion, say anything above 138 KV?
Thank you very much.
Kindest regards,
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
Could someone please let me know what they are using for insulation extruder screen packs for extra-high voltage extrusion, say anything above 138 KV?
Thank you very much.
Kindest regards,
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
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12 years 11 months ago #495 by Archived Forum Admin
Replied by Archived Forum Admin on topic Re: XLPE EHV Screen Packs
20/80/150/300/150/80/20 was the screen pack generally used upto 400kV for HV cables.
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12 years 11 months ago #496 by Archived Forum Admin
Replied by Archived Forum Admin on topic Re: XLPE EHV Screen Packs
Thank you very much for the information Venkat.
As you well know, the fundamental purpose of a screen pack is to provide back pressure for the plastic in the extruder and thereby allow proper mixing and melt temperature stability.
Barrier screws also provide excellent back pressure and temperature stability in the mixing section of the extruder and thus, in this case, the importance of the screen packs is much reduced.
A second point is high shearing of the melt at the screen pack can generate a lot of heat which can in itself pre-cure the melt. A 300 mesh screen and two 150 mesh screens is a lot of screening.
How long could you run before cleaning out the extruders?
Thank you again.
Kindest regards,
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
As you well know, the fundamental purpose of a screen pack is to provide back pressure for the plastic in the extruder and thereby allow proper mixing and melt temperature stability.
Barrier screws also provide excellent back pressure and temperature stability in the mixing section of the extruder and thus, in this case, the importance of the screen packs is much reduced.
A second point is high shearing of the melt at the screen pack can generate a lot of heat which can in itself pre-cure the melt. A 300 mesh screen and two 150 mesh screens is a lot of screening.
How long could you run before cleaning out the extruders?
Thank you again.
Kindest regards,
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
Please Log in to join the conversation.
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