Method and apparatus producing decorative melt fracture patterns

Details Method and apparatus producing decorative melt fracture patterns Method and apparatus producing decorative melt fracture patterns

1985-05-16

1986-10-07

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264 406, 264 407, 264130, 2641761, 425380, 425465, 425467, B29C 4712

Patent

active

046158588

ABSTRACT:
Beautifying patterns on the surface of extruded polymer products are produced by forcing molten polymer through a die which is coated with a controlled pattern of low surface energy material. Melt fracture of the polyethylene as it emerges from the die is produced at gaps in the coating material which may be silicon, inorganic or fluorine containing polymers.

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patent: 3920782 (1975-11-01), Cogswell
patent: 3942937 (1976-03-01), Prober et al.
patent: 3980744 (1976-09-01), Cogswell
patent: 4080138 (1978-03-01), Hutchinson et al.
patent: 4522776 (1985-06-01), Ramamurthy
Trans. Soc. Rheology; 1, 203, J. P. Tordella, (1957).
J. Appl. Polymer Science, 21, 1177, J. Vlachopulos, et al. (1977).
"Capillary Flow of Molten Polyethylene-A Photographic Study of Melt Fracture", Transactions of the Society of Rheology, vol. 1, 203 (1957) J. P. Tordella.
"A Comparison of Melt Fracture Initiation Conditions in Capillaries and Silts", Journal of Applied Polymer Science, vol. 21, 1177, J. Vlachopulos & T. W. Chan (1977).

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