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Pre-treatment
Subsequent to thorough cleaning of the raw material, different preliminary process steps are
implemented depending on the source of the raw material involved.
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Preparation of raw materials
Two principal processes are employed in the manufacture of gelatine:
Acid process - for type A gelatine:
The raw material (primarily pigskin) is first subjected to a 3-day digestion process.
Here, the material is treated with acid and immediately afterwards the gelatine
extraction process can be commenced.
Alkaline process - for type B gelatine:
This process extends over a period of several weeks and gently converts the collagen
structure. Only ossein or split can be used. The collagen produced in this way is
soluble in warm water.
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Extraction
Warm water is then added to the pre-treated material and a multi-stage extraction
process commences. The first gelatine fractions obtained, at low temperature, have
the highest gellation status; an approximately 5% solution is obtained. The remaining
material is then extracted using fresh, warmer water. This process is repeated until
the last traces of gelatine are extracted using boiling water. As the pre-treatment
carried out is extremely thorough, very little residue remains after extraction.
Extraction
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