MUMBAI - A Bollywood movie about an inventor who created a revolutionary machine that makes cheap sanitary pads hits screens this week, challenging taboos surrounding menstruation in socially conservative India.

Mr Arunachalam Muruganantham is nicknamed India's "menstrual man" for transforming the lives of poor women forced to use items like old rags, sand and leaves during their periods.

He has been lauded by India's government and is now getting the star treatment with Bollywood A-lister Akshay Kumar portraying him in Pad Man, releasing on Friday (Feb 9).

It is the latest socially conscious movie to come out of a film industry known more for producing complex love stories featuring handsome heroes and elaborate dance routines.

Mr Muruganantham hopes the movie will help raise awareness about the importance of menstrual hygiene in patriarchal India where women, particularly in rural areas, are frequently shunned during their monthly cycles.

"Menstruation is still a taboo subject in India and a tough subject for a film," he told AFP by phone from his home state of Tamil Nadu in southern India.

"But I read the script and I was also on the sets to guide them. I think (R.) Balki (the writer and director) has handled the subject beautifully.

"People will talk about personal hygiene and it will give hope to the younger generation to do innovative things," he added.

Mr Muruganantham's remarkable story began in the late 1990s when he was shocked to discover that his wife was using newspaper and dirty cloths during menstruation because sanitary pads were too expensive.

He decided to do something about it and started experimenting with different designs using cotton.

His first few prototypes were not very successful and quickly his wife and sisters refused to be guinea pigs any longer.

When other women in the village baulked at his requests to try his products he started testing them on himself, using a football bladder and animal blood.

Muruganantham was mocked and ostracised by fellow villagers, and his wife even left him for a while, but he remained undeterred and intensified his search.

After two years he discovered that sanitary pads are made from cellulose found on trees.

Muruganantham also learnt that the machine which ground down the pulp before turning it into napkins cost hundreds of thousands of dollars so he decided to create his own.

In four years he had invented an easy-to-use device which could produce pads at a third of the cost of the commercially produced ones. The machines themselves were also vastly cheaper at around 75,000 rupees (S$1,540).

"I wanted to make sure that technically we did not go wrong, so he agreed to supervise," the director Balki said of Mr Muruganantham's role on set.

Actresses Radhika Apte and Sonam Kapoor star alongside Kumar whose character based on Mr Muruganantham is called Lakshmi.

The 50-year-old actor, whose films regularly rake in more than one billion rupees at the box office, is no stranger to starring in movies with an important message.

Last year's comedy, Toilet: Ek Prem Katha (Toilet: A love story), focused on the lack of toilets in India and the problem of open defecation.

It was a runaway success, grossing upwards of 2 billion rupees, but Balki says a film about periods is an altogether different proposition.

"Pad Man is possibly the riskiest film Akshay has done because of the taboo, unexplored subject," he told AFP.

Several million more Indian women are now estimated to use sanitary pads thanks to Mr Muruganantham.

His company, Jayaashree Industries, has more than 2,000 units across the majority of India's states and also exports to dozens of countries. The machines also provide employment to thousands of rural women.

In 2014 he was included in Time magazine's list of 100 most influential people in the world. Two years later India's government awarded Muruganantham one of the country's highest civilian honours.

The release of Pad Man is set to elevate his fame further but he insists he won't be letting it go to his head.

"The cause is becoming big, but I am remaining the same," he told AFP.