1) Raw material: Fresh skin from healthy slaughtered cattle.
2) Manufacture process: extraction, purification, concentration,
polishing, filtration, drying, grinding, sifting and blending.
3）application of gelatin
1. Coating and Sizing
Technical gelatins are used in the warp sizing of rayon and acetate
yarns. The gelatin size adds strength to the warp and resistance to
abrasion so that breakage of the warp is minimized. Gelatin is
particularly well suited for this application because of its
excellent solubility and film strength. It is applied in aqueous
solution along with penetrating oils, plasticizers and antifoam
agents before weaving, and later removed during finishing by
washing with warm water.
Panama hats are sized with gelatin. Sizing helps preserve the shape
of the hat while imparting resistance to water and dirt. An
emerging technology involves the use of gelatin to size quartz
fibers for space-age fabrics.
2. Paper Manufacture
Gelatin is used for surface sizing and for coating papers. Either
used alone or with other adhesive materials, the gelatin coating
creates a smooth surface by filling up the small surface
imperfections thereby ensuring improved printing reproduction.
Examples include posters, playing cards, wallpaper, and glossy
High quality rag-based papers, such as those used for blueprints
and currency, also feature a gelatin size coating. The result is a
paper which has good moisture and abrasion resistance as well as
good adhesion to printing inks. During manufacture the gelatin
coatings are rendered insoluble by treatment with cross-linking
The permanent crinkle in crepe paper is the result of gelatin
3. Printing Processes
For over a century, gelatin compositions have been used in
printers' rollers and plate wiping rollers for multicolor presses
and offset lithography. Several photo-printing methods depend on
the effect of light on a gelatin film which has been sensitized by
treatment with potassium or ammonium dichromate. Examples of
printing applications include carbon printing, collotype printing,
silk screen printing, and photogravure printing.
4. Protective Colloidal Applications
Much like edible gelatin is used for clarification of wine, beer
and juices, technical gelatins are employed in the removal of
extremely fine particles that cannot be settled out or filtered out
of chemical solutions. Here gelatin is absorbed onto the surface of
the particles effecting a coagulate that may be removed by settling
or filtration. Approximately one pound of gelatin per ton of ore is
used as a filtration aid during the extraction of uranium ore.
Gelatin is used almost universally as the binder for the complex
mixture of chemicals used to form the head of a match. The surface
activity properties of gelatin are important since the foam
characteristics of the match head influence the performance of the
match on ignition.
6. Coated Abrasives
Gelatin is used as the binder between the paper substrate and the
abrasive particles of sandpaper. During manufacture the paper
backing is first coated with a concentrated gelatin solution and
then dusted with abrasive grit of the required particle size.
Abrasive wheels, disks and belts are similarly prepared. Oven
drying and a cross-linking treatment complete the process.
Over the past few decades gelatin-based adhesives have slowly been
replaced by a variety of synthetics. Recently, however, the natural
biodegradability of gelatin adhesives is being realized. Today,
gelatin is the adhesive of choice in telephone book binding and
corrugated cardboard sealing. The tackifying power of gelatin is
used to advantage in the manufacture of packaging ribbons, decals,
gummed tapes, glass laminates and composition cork gaskets. Hard
cover book bindings typically utilize gelatin-based adhesives.