Jltlv 1, 1921 



THE INDIA RUBBER WORLD 



'19 



ing from the main shaft. The reel supports nine shafts with 

 carrjing heads, each head composed of a frame holding 

 four sets of forms fastened in grooves E. Dipping tanks 

 B are filled with the rubber solution, and forms A are applied to 



the boards C, which 

 are placed in position 

 in the head of the 

 frame D. When the 

 forms are in position 

 cams F raise the tanks 

 B, causing the forms 

 to be immersed in the 

 solution to a prede- 

 termined depth, after 

 which the tanks re- 

 cede. Then the pin- 

 ion G is moved 

 through about 1-40 de- 

 grees, and the ratchet 

 mechanism advances 

 the carrying head D 

 one step, thus bring- 

 ing the next set of 

 forms in position 

 over the dipping 

 tanks. When this has 

 been accomplished, the set of forms which have already 

 been immersed have been moved forward about 36 degrees, 

 placing the forms almost vertically above their original positions, 

 thus permitting each deposit of solution to dry. 



When a sufficient number of immersions have taken place 

 to produce the desired thickness on the forms, the lowermost 

 dipping board of the frame is removed and a new one inserted. 

 In this way the operation of the machine is made continuous. 

 This machine is designed especially for making nipples, 

 medicine-dropper bulbs, finger-cots and similar goods, but not for 

 gloves. 



DIPPING ROOM 



In laying out a dipping room the machines for dipping gloves 

 and balloons are arranged around the sides of the room and 

 space is reserved in the center for drying the finished goods. 

 Very essential features in 1x5th dipping and finishing rooms 

 are those that guard the tacky goods from injury from dust, 

 insects, and particles of all sorts falling from walls and ceiling, 



Fig. 6. 



Mahonev's Revm.ving Dipping M.\chine 



or road dust gaining entrance by the force of wind blow- 

 ing through open windows or through poorly-fastened window 

 frames. Plenty of sun and a well-planned system of power ven- 

 tilation are important in drying the product between dippings and 

 before vulcanization. 



Fig. 8. Air-Conditioning Equipment 



The presence of naphtha in dipped goods during the cure 

 results in a lifeless product lacking in resiliency and consequently 

 cannot be permitted. It can be successfully eliminated only by 

 thorough drying. The drying problem of the dipped goods 

 manufacturer is vital to successful production and he realizes 

 how seriously outdoor weather conditions affect his production 

 processes. 



Ideal drying conditions — say 72 degrees F. and 55 per cent 

 relative humidity — can be regularly secured only by an air-con- 

 ditioning system which circulates clean air under controlled con- 

 ditions of temperature and relative humidity, making every day 

 a "good day." A typical air-conditioning equipment is shown in 

 Fig. 8. The apparatus comprises the humidifier, heaters, fan 

 and automatic control for both temperature and himiidity. 



DIPPING PHOCESS 



Hydrometers or other means of testing liquids fail to give prac- 

 tical indications of the suitability of dipping cement for use, and 

 in this matter dependence is placed entirely on experienced judg- 

 meht. Loss of evaporation of solvent, which would thicken the 

 cement and tend to crust it over, is minimized by covering the 



Gloxt-Forms in Position for Dipping 



Fig. 7. Dipping Room 



Dipped Glove-Forms Reversed for Drying 



