लोच और ताकत में सुधार करने या उन्हें कठोर करने के लिए महान गर्मी पर सल्फर के साथ रबड़ या रबर की तरह सामग्री का इलाज करने की प्रक्रिया

Noun:

वल्कीनकरण,

vulcanization शब्द के हिंदी अर्थ का उदाहरण:

चित्र जोड़ें वल्कनीकरण (Vulcanization या vulcanisation) एक रासायनिक प्रक्रिया है जिसमें गंधक या इसी प्रकार का कोई दूसरा पदार्थ मिला देने से रबर या संबंधित बहुलकों को अपेक्षाकृत अधिक टिकाऊ पदार्थ में बदल दिया जाता है।

वल्कनीकरण प्रेस में, या भाप की उपस्थिति में, या शुष्क ताप पर संपन्न हाता है।

गंधक के साथ त्वरक को मिला देने से वल्कनीकरण शीघ्र संपन्न हो जाता और रबर में कुछ अधिक उपयोगी गुण भी आ जाते हैं।

वल्कनीकरण में गंधक रबर के साथ रसायनत: संयुक्त होता है।

कुछ त्वरकों से तो सामान्य ताप पर ही वल्कनीकरण हो जाता है।

वल्कनीकृत रबर का गुण वल्कनीकरण के ढंग पर बहुत कुछ निर्भर करता है।

वल्कनीकरण के लिए कच्चे रबर को गंधक के साथ लगभग १४०° सें. पर तीन से चार घंटे तक गरम करते हैं।

জজজ वल्कनीकरण और जीर्णन से यह गुण घट जाता है।

वल्कनीकरण में 3 से 5 प्रतिशत गंधक इस्तेमाल हो सकता है।

वल्कनीकरण से भौतिक गुणों के साथ साथ रबर के रासायनिक गुणों में भी परिवर्तन हो जाता है।

वल्कनीकरण के लिए कच्चे रबर को गंधक के साथ लगभग 140° सें. पर तीन से चार घंटे तक गरम करते हैं।

रबर का वल्कनीकरण महत्व का प्रक्रम है।

वल्कनीकरण (Vulcanization) ।

vulcanization's Usage Examples:

Cut sheets, or articles made from them, may be saturated by being laid in powdered sulphur maintained for some hours at about 110° C. Sheets sulphured in this way can be made up into articles and joined together either by warming the parts to be united, or by means of indiarubber solution; after which the true vulcanization, or " curing," as it is termed, can be brought about in the usual way.

When a manufactured article has been saturated with sulphur in the melted sulphur bath, the heat necessary for vulcanization may be obtained either by highpressure steam, by heated glycerin, or by immersion in a sulphur bath heated to about 140° C. In this last case absorption of the sulphur and its intimate combination with the rubber occur simultaneously.

After vulcanization, rubber is no longer softened by a moderate heat, a temperature of 160° C. scarcely affecting it, nor is it rendered rigid by cold, and the ordinary solvents fail to dissolve it.

Uncombined sulphur is injurious, and often leads to the decay of vulcanized goods, but an excess of sulphur is generally required in order to ensure perfect vulcanization.

Cut sheets, or articles made from them, may be saturated by being laid in powdered sulphur maintained for some hours at about 110° C. Sheets sulphured in this way can be made up into articles and joined together either by warming the parts to be united, or by means of indiarubber solution; after which the true vulcanization, or " curing," as it is termed, can be brought about in the usual way.

When the vulcanization of rubber is carried too far, from the presence of a very large proportion of sulphur and an unduly long action of heat, the caoutchouc becomes hard, horn-like, and often black.

Sulphur when warmed with caoutchouc combines with it, and on this fact the vulcanization of rubber depends, and also the production, with an excess of sulphur, of the hard black material known as vulcanite or ebonite.

When a manufactured article has been saturated with sulphur in the melted sulphur bath, the heat necessary for vulcanization may be obtained either by highpressure steam, by heated glycerin, or by immersion in a sulphur bath heated to about 140° C. In this last case absorption of the sulphur and its intimate combination with the rubber occur simultaneously.

Vulcanization takes place in this instance without the action of heat; but it is usual to subject the goods for a short time to a temperature of 40° C. after their removal from the solution, in order to drive off the liquid which has been absorbed, and to ensure a sufficient action of the chloride of sulphur.

Vulcanization is then effected by steam heat, and, the preparation on the cloth being softened by water, the sheet of rubber is readily removed.

vulcanization's Meaning':

process of treating rubber or rubberlike materials with sulphur at great heat to improve elasticity and strength or to harden them