

Voiron survived a difficult conversion after the departure of companies Rossignol and Johnson & Johnson. Voiron has sought to keep its independence from its much larger neighbor, the Grenoble conurbation. Voiron remains a significant economic and administrative center of the department of Isère. The company Radiall was founded as well and the population of Voiron grew past 15,000.

At the same time, the rise of paper mills on the banks of the Morge, the river crossing the small town, attracted workers to the city. On the eve of the First World War, the silk-weaving business used nearly 3,000 looms. Entire families of Voiron, along with Italian immigrants who arrived en masse at the beginning of the century, worked in these factories. The company Skis Rossignol was founded in 1907 by Abel Rossignol. A statue representing the Virgin Mary and the infant Jesus, a tribute to Notre-Dame-de-France Puy-en-Velay, was also erected. Voiron also gained religious influence marked by the 1876 erection of the Saint-Bruno church of neo-Gothic style by a first magistrate. Voiron then benefited from a female workforce, housed at the factory and often poorly paid. Voiron came to be known for its fine silks, sought after by European royalties. The nineteenth century saw the decline of the era of canvas in Voiron because of the scarcity of linen and cotton, and because of the disappearance of the sailing navy which had been a large consumer of canvasses. Saint Bruno, founder of the Carthusian Order to whom the church of Voiron is dedicated

However, the production of canvas continued, and their reputation allowed Voiron to maintain this activity under the First Empire due in large part to purchases by the army. The privileges granted by Louis XII disappeared during the French Revolution. The city acquired a great reputation thanks to its paintings resulting from a secular know-how. Since the beginning of the century, production had been organized around the Voironnaise factory and canvases were marked to certify their origin. In 1700, the capital of the Chartreuse massif and its surrounding area had about 1,200 inhabitants and more than a hundred of them worked in the processing of hemp. In the Treaty of Paris (1355) the count exchanged Voiron and the rest of the region between the rivers Rhône and Isère (watered by the Guiers Mort) for Faucigny and Gex from France. Voiron had been a part of the County of Savoy in the Middle Ages. ( July 2018) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources.
