Soap-Making Manual: A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. — John Shaqi
Soap-Making Manual: A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant.Thomssen, Edgar George
Science
Soap-Making Manual: A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant.
Thomssen, Edgar George
Soap
Floating soap occupies a position midway between laundry and toilet
soap. Since it is not highly perfumed and a large piece of soap may be
purchased for small cost, as is the case with laundry soap, it is
readily adaptable to general household use. Floating soap differs from
ordinary soap in having air crutched into it which causes the soap to
float in water. This is often advantageous, especially as a bath soap,
and undoubtedly the largest selling brand of soap on the American market
today is a floating soap.
In the manufacture of floating soap a high proportion of cocoanut oil is
necessary. A most suitable composition is one part cocoanut oil to one
part of tallow. This is an expensive stock for the highest grade of soap
and is usually cheapened by the use of cottonseed or various other
liquid oils. Thus it is possible to obtain a floating soap from a kettle
stocked with 30 per cent. cocoanut oil, 15 per cent. cottonseed oil and
55 per cent. tallow. With this quality of soap, however, there is a
possibility of sweating and rancidity, and of the soap being too soft
and being poor in color.
The process of manufacture is to boil the soap in an ordinary soap
kettle, after which air is worked into the hot soap by a specially
constructed crutcher, after which the soap is framed, slabbed, cut into
cakes and pressed.
Concerning the boiling of the soap, the saponification must be carefully
carried out, as the high proportion of cocoanut oil may cause a violent
reaction in the kettle causing it to boil over.
The method of procedure is the same as for a settled soap up to the
finishing. When the mass is finally settled after the finish, the soap
should be more on the "open" side, and the object should be to get as
long a piece of goods as possible.
Due to its high melting point, a much harder crust forms on the surface
of a floating soap and in a greater proportion than on a settled soap
during the settling. In a large kettle, in fact, it has been found
impossible to break through this crust by the ordinary procedure to
admit the skimmer pipe. Much of the success of the subsequent operations
depends upon the completeness of the settling, and in order to overcome
the difficulties occasioned by the formation of the crust everything
possible should be done in the way of covering the kettle completely to
enable this period of settling to continue as long as possible.
Public-domain text, read in full here on John Shaqi.
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