Posts : 409
Join date : 2011-06-10
|Subject: The first step in the manufacture Mon Jun 13, 2011 11:10 am|| |
Shoe polish can be manufactured using large vats, reasonably powerful heaters and air conditioners. There is no set method of manufacture, although most methods use pressures of two atmospheres to ensure the naphtha does not boil off, and temperatures of up to 85 °C.[dead link]
The first step in the manufacture of a typical shoe polish is the melting of the wax with the highest melting point in an electric heater. Following this, all other waxes are added, usually by descending order of melting point. Whilst this wax is held at a constant temperature, the emulsion—a mixture of the various oils and, if used, fats, is then heated separately, at around 85 °C. The heated emulsion is then added to the waxes, along with distilled water. When the mixture reaches around 80 °C, turpentine oil is added. This mixture is then mixed and continually stirred for half an hour. Dyes are added and mixed in turpentine oil if it is not a neutral polish. The mixed mass is reduced slowly to 50 °C, and as its viscosity increases, it is poured through a closed funnel into a cooling chamber. The poured mass is allowed to settle slowly, providing uniform distribution. The process is considered straightforward and the required equipment is relatively easy to acquire. The cost of establishing shoe polish manufacturing facilities has been estimated at around $600,000 (as of 2005).
Shoe polish is traditionally packaged in flat, round, 60-gram (2-ounce) tins, usually with an easy-open facility. Because the amount of shoe polish that needs to be applied is small, and the shoe polish will desiccate due to volatile ingredients, such as naphtha, a large container would dry out before being fully used. The traditional flat, round tins have since become synonymous with shoe polishes.stomach ulcer symptomsnostradamus 2012