120 PLANTING IN UGANDA 



after arrival at the factory should be strained to 

 remove any bark or pieces of coagulated Rubber. 

 It is then ready for coagulation. The system we 

 adopt is to coagulate in troughs. By this means 

 we get a coagulum which is convenient in shape 

 for feeding the crepeing machine and being 

 turned into Sheet Rubber. The troughs are 3 ft. 

 long, 6 ins. wide, and 6 ins. deep. 



A bucketful of cold water, to which has been 

 added a few drops of acetic acid, is first put into 

 the trough, and the latex is then added and stirred. 

 The trough is afterwards covered over and allowed 

 to stand until coagulation is complete. This, with 

 us, takes a few hours, but the process can be 

 hastened to any extent by the use of more acid, or 

 by substituting hot for cold water. 



Coagulation takes place through the Rubber 

 separating from the water and forming on the top, 

 as cream does on milk. The process is complete 

 when the liquor under the Rubber is perfectly 

 clear. The coagulum is then put through the 

 crepeing machine two or three times, and is ready 

 for drying. 



In crepeing the Rubber, care must be taken to 

 feed the rollers regularly, and to put but little 



