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J J Murphy: Kerala’s Rubber Man

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J J Murphy: Kerala’s Rubber Man “On a rainy day in Ooty, South India’s famous hill station, some nuns were walking along a road in the cold. Suddenly, a car stopped by and the gentleman driving it offered them a lift. He asked why they were not using a vehicle in such inclement weather. The nuns replied that their convent did not have one. The next day, a local dealer delivered a brand new Dodge car to the convent. The astonished nuns thanked the donor. They also told him they could not keep the vehicle because there was no money to engage a driver or to buy petrol. The gentleman assigned a driver on his payroll to the convent. He also instructed a petrol bunk to forward the convent’s bills to his office.” This is an anecdote about a man you’ve probably never heard of – an Irishman named John Joseph Murphy (1872 – 1957). But in the rubber plantations of Kerala, Murphy is a legend. A planter who arrived in India at a very young age, it was Murphy who set up India’s first commercially su...
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FILL FACTOR

In the rubber mixing process, especially for internal mixers like a 110-liter volume mixer, the recommended fill ratio typically falls within the range of: Fill Ratio: 65% to 85%The fill factor or fill ratio is typically calculated as: Fill Ratio (%) = (Batch Weight / Mixer Chamber Volume) × (Specific Gravity of Compound) × 100 Example: Mixer Volume = 110 liters Target Fill Ratio = 75% Specific Gravity of Rubber Compound = ~1.2 So: Batch Weight = (110 × 0.75) / 1.2 ≈ 68.75 kg This means around 68–72 kg would be an optimal batch weight for a typical compound with SG ~1.2 in a 110 L mixer.
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