According to the study “Asia Dewaxed Bleached Shellac Industry Situation
and Prospects Research report”, shellac is
manufacture in various forms so that they can be used as food grade or
pharmaceutical grade. In food industry, aqueous shellac solutions are prepared
that can be formulated with oils or waxes and can be used in confectionary.
Pharmaceutical grade shellac is used for glazes and gloss due to narrow
specification and constant quality. It is used as a controlled release coating
for nutritional supplements for tablets and soft and hard capsules. The major
applications of dewaxed bleached shellac are in food, agriculture,
confectionery, chewing gum, pharmaceutical, nutritional supplements, wood
treatment, textiles, leather, printing, packaging, industrial, glazing agents,
edible surface coatings, binding agents, varnish, polish, non-edible coatings,
technical and other applications. The pharmaceutical industry uses dewaxed bleached
shellac in the coating of capsules, pills and tablets, to protect internal ingredients.
It is also used in cosmetics, food packaging, chocolate coatings, foils and laminated
papers, ink, flexografics, hair-laquer, insulating varnishes, leather dressing,
electrical, electronic and rubber compounds.
Lac is the raw material form which shellac
is derived and is a natural resin. It is the resinous secretion of a tiny scale
insect known as kerria lacca. It is a parasitic
on certain host trees existing in India. The resins are of different colours
due to different insect strains and with varied chemical compositions. The
selection of lac or seedlac is important to ensure uniformity and consistent
quality of the final product. Bleaching process is performed to produce refined
dewaxed bleached shellac. After bleaching process, the so obtained solution is later
filtered to remove any insoluble material and wax. This solution is again bleached
with sodium hypochlorite to remove any colour present. The so obtained shellac
is then precipitated from the solution by adding dilute sulphuric acid, before
being filtered, washed with water and dried. Dewaxed bleached shellac is
colourless powder and contains very less quantities of wax which is soluble in alcohol
and aqueous alkaline solutions.
Few manufacturers use solely light coloured
kushmi seedlac which requires only a moderate amount of bleaching that result
in a relatively low acid value and less impact on the molecular structure of
shellac. This process offers dewaxed bleached shellac with high and constant
quality. This product when dissolved in an alcohol or an aqueous alkaline
solution, appears clear, transparent and has good film forming properties,
providing a high gloss coating with good surface adhesion.
Dewaxed bleached shellac is stored in cold-storage
godowns or in air conditioning rooms or in cool places to maintain its powder
form. Asian dewaxed bleached shellac is categorised based on types such as
dynamic method and static method. The leading players in dewaxed bleached
shellac market in Asia are Hind Suter Shellac Pvt. Ltd., Aadhya International,
AF Suter & Co Ltd, Kunming FrontSeeker Tech Co., Ltd., Tajna Shellac Pvt.
Ltd., Vishnu Shellac, Paras International, Shri Gopal Shellac Industries and
Jamnadas International. Geographically, bleached shellac market in Asia is
spread across China, Japan, Korea, India, Saudi Arabia and other regions. The
ever-increasing population, demand for various food products, evolution in
pharmaceuticals and cosmetic sector coupled with steady growth in various
industries will surely drive the growth of dewaxed bleached shellac industry in
Asia.
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