THE EFFECT OF STOCK TEMPERATURE ON THE PHYSICAL PROPERTIES OF POLYTHENE COATINGS FOR WIRE,
Abstract
One of the many factors to be considered during the extrusion coating of wire, is the stock temperature of the extrudate at the point where it comes into contact with the conductor. The effect on the physical properties of the resulting conductor coating of a range of stock temperatures was determined for low density polythene. It is the purpose of this paper to present the findings obtained, with emphasis being placed on the ultimate tensile strength and elongation at break of the extruded coating. In this study, stock temperature was measured with a hand pyrometer, the needle of which was immersed in the melt about half an inch from the end of the cross-head insert. It has been found that the ultimate tensile strength and elongation at break of low density polythene coatings on wire are very dependent upon the stock temperature which the extrudate has attained by the time it has come into contact with the moving conductor. The general trend of improving tensile properties with increasing stock temperature has been observed for polythenes varying in melt index from about 0.4 to about 7.00, for aged and unaged samples and for several cross-head insert designs. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1957
- Accession Number
- AD0656417
Entities
People
- J. A. Durno