Improvements in the treatment of centrifugally spun artificial silk cakes

摘要

Apparatus for treating centrifugally spun artificial silk cakes with liquid comprises in combination a perforated base plate on which single cakes or piles of cakes can be placed, each cake or pile over an opening, a movable cover for the upper ends of the cakes, means for holding the cover in such a position as to hold the cake firmly and a constant head device for feeding the liquid through the cakes. In one form of apparatus, Fig. 2, cakes 13 are PICT:0424056/IV/1 PICT:0424056/IV/2 PICT:0424056/IV/3 PICT:0424056/IV/4 mounted over perforations 12, 31, in plates 11, 29, and are clamped between the plates as shown at 34. The treating liquid is fed in through 21 from a constant head device 17, liquid draining from the cakes passing from well 35 to sump 37. In another form, (not shown), a single layer of cakes is treated. The perforations in the top plates may be fitted with a device to allow escape of gases from the interior of the cakes, but hinder escape of liquid. This may comprise a capillary tube, preferably inverted, as shown, Fig. 3, or a tube with a constricted outlet and containing a rubber float. The openings in the lower plate may be fitted with a device to prevent too rapid draining of liquid. This may comprise a plug 47, as shown, Fig. 5, with small passages 49 leading into a larger passage 48 or a perforated disc with limited upward movement, seated over the perforations. Cakes may be supported in piles as shown, Fig. 7, and may be enclosed in permeable coverings.