APPARATUS FOR JACKETING TUBULAR STOCK

摘要

Upper and lower advancing means advance tubular stock in downward direction and in a predetermined path which comprises at least some superimposed helical convolutions of low pitch. A feed device is arranged at the upper end of the path and a takeup device is arranged at the lower end of the path for the tubular stock. Extruding means is arranged adjacent one of the convolutions for extruding onto the outer circumferential surface of the advancing tubular stock a circumferentially complete jacket of cellular synthetic plastic. Forming means is arranged adjacent a second convolution downstream of the extruding means forming the peripheral surface layer of the obtained jacket into a continuous smooth skin. Cooling means is arranged adjacent still a further convolution downstream of the forming means and cools the resulting jacketed tubular product.