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An experiment involving expanded polypropylene insulation for cable conductor is described. Faults detected on the extrusion line were the result of a seam of relatively solid material containing large air cells. After investigation the seams were concluded to be formed by poorly nucleated plastic flowing from dead spots in the crosshead of the extruder. The development of a crosshead flowpath which provided the solution to this problem is described.
An experiment involving expanded polypropylene insulation for cable conductor is described. Faults detected on the extrusion line were the result of a seam of relatively solid material containing large air cells. After investigation the seams were concluded to be formed by poorly nucleated plastic flowing from dead spots in the crosshead of the extruder. The development of a crosshead flowpath which provided the solution to this problem is described.
| Author(s) | Bauer, E.O., Bell Telephone Labs, Inc., Fox, P.E. |
|---|---|
| Publication/Event/Pages | Wire & Wire Products37(3): 359-260, 362, 395-396 |
| Year | 1962 |
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