Patent GB-1398931-A (GB)
Title: Evaporative cooling of shaping tools in glass manufacture
IPC: C03B23/00
Filed: 1972-07-18
Abstract: 1398931 Cooling glass moulds and dies HERMANN HEYE 18 July 1972 [8 Oct 1971] 33584/72 Heading C1M In the method of cooling glass moulds or dies by utilizing the heat of evaporation of a cooling liquid, the liquid is sprayed in finely divided condition from a plurality of spray nozzles locally on to the tool for evaporation thereon, the spraying being effected without the aid of a drive or carrier gas and the supply of cooling liquid to each spray nozzle or group of spray nozzles is controlled and/or regulated independently. Preferably the liquid is water heated to a temperature below its boiling point and is delimed and desalted pure water containing a wetting agent such as a detergent, methanol or ethanol. As shown in Figs. 1 and 3, a press die 30 is internally cooled by three sets of spray nozzles, each fed separately by tubes 33, 34 and 35 passing through the top drive coupling ring 31; tube 33 feeding a middle body 39 having three spray nozzles 40; tube 34 feeding an upper body 41 with three spray nozzles 43, 44; and tube 35 feeding a lower body 47 having a down spray nozzle 49 and further side spray nozzles, as 50. The three spray nozzle bodies 39, 41 and 47 can be supplied all together or singly and the pressure in the tubes 33, 34 and 35 is separately variable. The spray comes in a fine mist, as cores 60 and 61, pass the liquid on to the inner wall 63 of the die 30, whose outer wall 64 is in contact with the glass. As shown in Figs. 8 and 11 for a finishing mould 130 in a blowing machine, comprising neck mould halves 131, 132, mould halves 135, 136 and base 139 for forming a bottle 140. Neck mould halves 131, 132 are cooled by spray nozzles 143, 269 movable in and out; up and down and from side to side: neck base 139 by a spray nozzle 189 movable up and down and the mould halves 135, 136 by upper and lower pairs of spray nozzles 163, 165 and 265; 180, 182 and 267 which are mounted on the mould supports 155 and 156 by which the mould halves are moved into and out of position; or may be fixed to the machine frame. The nozzles 143, 269 and 189 similarly may be mounted to move with the tool part or on the machine frame. Water for a tank 240 is purified by a filter 241 and supplied by pump 243 to a line 245 and thence to branch lines 247, 248, 249 and 250 with pressure limiting valves 253 to 256 and through 2-way 2-position valves 259 to 262 to supply respectively the base nozzle, lower mould nozzles, upper mould nozzles and neck mould nozzles. A temperature sensor 270 and limit switch 275 operated by contact with the mould are connected by leads 271, 276 to an input to a regulator 273. Output leads 278 to 281 connect to the valves 259 to 262 so that spraying starts when limit switch 275 is operated and stops when temperature sensor 270 indicates the mould is sufficiently cool, several such sensors being provided for each part so that the duration of spraying of each set of nozzles is individually controlled.  The surface of the mould or die may be profiled so as to produce a capillary structure to distribute the sprayed on cooling water. The capillary structure may be formed by circumferential, longitudinal or axial grooves of triangular, semicircular, square or rectangular cross-section.