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Shellac buy in Kolkata
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Shellac

Shellac

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Description
Seedlac is converted into Shellac either by traditional hand made process or comparatively modern machine made process.

Seedlac is converted into Shellac either by traditional hand made process or comparatively modern machine made process. Hand made shellac is produced by properly blending Seedlac into long narrow cloth bag and heating one end over charcoal fire and the other end is attached to a windless and is gradually twisted. The heat produced by the charcoal fire melts the lac which is forced out through the cloth by pressure. The molten lac is scraped out and drawn into sheets manually and left to dry. This process requires considerable manual skill and long experience. The traditional hand made grades are Lemon No.1, Lemon No.2, Standard One, TN Superfine etc. Hand made shellac is mostly exported to U.S.A., Germany, Japan etc. The impurity varies from 0.75 to 1.5.

Is produced in two different ways- one is the heat process where the same principle as in the case of hand made shellac is applied and the second is solvent process where pure shellac is extracted from Seedlac by suitable solvents. Under heat process the separation of pure lac is achieved by melting Seedlac by steam heat and squeezing the soft molten lac through filter my means of hydraulic presses. The molten lac is then stretched by means of rollers into long continuous sheet which is broken into pleces to form the machine made Shellac under heat process. This shellac has an impurity content varying from 0.5 to about 1%. There are various grades under heat process machine made shellac. The most popular being TN, Lemon and Orange. These grades are exported to practically all lac consuming countries.

Under solvent process wax and impurities are practically Completely removed by dissolving the seedlac in a suitable solvent, usually, chilled industrial alcohol. The solution is then filtered through fine cloth and the alcohol is recovered by boiling the solution. The molten shellac is then stretched to the required thickness on a roller. The product does obtained is known as Dewaxed Shellac. The most popular grades being Dewaxed Orange, Dewaxed Lemon, Dewaxed Garnet etc. Highly sophisticated grades of dewaxed and Decolourised Shellac can be produced by this method by adding activated carbon as the decolouring agent. The impurity is around 0.2%. Dewaxed or Decolourised Shellac are imported mostly by the advanced countries like U.S.A., Germany, U.K., Italy, France etc.


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