Fabrication of rubber objects, Chemistry

Q. Write short notes on fabrication of rubber objects.

Sol. Fabrication of Rubber: in the row condition rubber is composed of molecules of great length and molecular weight. Although it is thermoplastic in this condition its plasticity can be improved by working or masticating the rubber in air at room temperature. This has the effect of partially oxidizing rubber resulting in fragmentation of the large molecules into more plastic but smaller ones. For various objects different process are used which are described below.

(1)                         Extrusion: the machine used for extrusion of rubber is sometimes called a tuber which is used for extruding continuous length of tread and side wall stock for tyres. The continuous strips are later cut into proper length to make tyre.

(2)                         Calendaring: the process is used for making continuous sheets of rubber or impregnating fabric with rubber. If the circum perennial speed of the rolls is faster than the speed of the cloth the process is called fractioning and rubber compound is wiped into the voids of the fabric.

(3)                         Moulding: moulding of rubber parts is accomplished mainly by compression moulding and transfer moulding.

(4)                         Dipping and Electrode position: both are used to produce shapes such as gloves face masks and balloons from latex. The same way as metals are deposited from solutions.sss

 

 

Posted Date: 7/21/2012 8:38:33 AM | Location : United States







Related Discussions:- Fabrication of rubber objects, Assignment Help, Ask Question on Fabrication of rubber objects, Get Answer, Expert's Help, Fabrication of rubber objects Discussions

Write discussion on Fabrication of rubber objects
Your posts are moderated
Related Questions
how many process there are to extracte copper from copperpyrites/

(a) Using Lewis structures to describe your reasoning, describe why the following ions have different bond angles: ClO2 - and NO2 - (b) Given that the spatial arrangement of a

Two kg Ammonia (mA) at  P A = 300  kPa and T A = -10ºC and 1 kg Ammonia (m B ) at P B = 300 kPa and T B = 100ºC  are mixed in a constant pressure and adiabatic process. Find th

Vapour phase cracking - Hydrocarbon In this method, gas oil or kerosene oil is vaporized in vapour phase. The temperature is reserved 600 - 800 o C and the pressure is approxim

Q. Evaluate Total Solids in Milk? Total solids determination is a common procedure in many manufacturing plants using dairy products. The total solids in milk can be calculat

Q.   What are the characteristics of drinking water?  Sol. Characteristics of drinking water: (1)         It should be colourless and odourless. (2)         It s


Elements of Group 13 are namely, boron, aluminium, gallium, indium and, thallium. While studying the alkali and alkaline earth metals, you have seen that all the elements of these


Calculate the total heat (in J) needed to convert .777 moles of gaseous ethanol at 300 degrees C and 1 atm to liquid ethanol at 25 degrees C and 1 atm. Extra info: b.p. 78.5 degree