Introduction to Basic Manufacturing Processes and ... - always yours

Albumen glue
Carpentry 161
It is prepared by adding an alkali to beef blood and is available in flakes forms in the
market. During use they are dissolved in water in about an hour earlier, to found a liquid
solution and it gives a very strong and water proof bond.
Synthetic resin glue
This glue is made from formaldehyde uric acid and other chemicals. It is available in
generally powder form. Before use, it is thoroughly mixed with water to proper consistency.
The commercial varieties of resin glue involve polyvinyl-resin glue in liquid form, plastic resin
glue in powder form and resorcinol-resin. The polyvinyl glue is the fastest setting, strong,
easy to use and it is extensively used in furniture and decorative work. The plastic resin glue
is mainly used in plywood work. The resorcinol glue can be used for joining wooden parts
which are constantly subjected to changing weather condition exposed to humid environment.
Paint and varnishes
They are commonly applied on wooden or metallic articles for the reasons to protecting
the surfaces of wood or metal from the effects of moisture and weather change. They are used
on surfaces for making them decorative in appearance.
9.11 CONSTITUENTS OF AN OIL PAINT
A good paint must have sufficient fluidity so that it can be easily spread by a brush over the
surface. It should form a durable and wear-resistant film on drying over the surface of wood.
It should retain its color on drying and under changing conditions of atmosphere and should
not be affected much by moisture. It should give a pleasing appearance to the surface on
drying. An oil paint comprises of various constituents such as base, vehicle, pigments, thinner
and driver which are discussed as under.
Base is a major constituent of oil paint. It is finely ground powdered material which is
mixed and then applied to the surface of the finished part to form the body of the paint. The
functions of a paint base is to provide a sort of reinforcement to the film coated on the surface
of finished parts after it dries, in order to make it hard and wear-resistant for long life. It
also minimizes the chances of cracking of the coated film of paint after drying. Commonly
used bases involve white lead, red lead and iron oxide.
The second constituent named as vehicle will act as a binder for the solid material and
enables suspension of base and other coloring pigments in order to allow their even application
on the prepared surface of the products and it facilitate its adherence to the latter. The well
known vehicles are raw linseed oil, single or double boiled linseed oil, refined linseed oil, nut
oil, stand oil and poppy oil.
The third constituent of oil paint function is pigments which provide various colors to
the paints. They are generally available in fine powdered form and the best one is which does
not change its color even on being exposed to sun and heat. The black color oriented common
pigments are graphite, lamp black, and vegetable black. The blue color oriented common
pigments involve Prussian blue, cobalt blue, indigo. The green color oriented common pigments
is chrome green. The red color oriented common pigments are Indian red, red lead, vermilion,
and venetian red. The brown color oriented common pigments are raw umber, burnt umber,
raw sienna, burnt sienna. The black color oriented common pigments are chrome yellow and
yellow achre.