Guar Gum Manufacturing Process
Depending upon the requirement of end product various processing techniques are used. In India the commercial production of Guar gum is normally undertaken by using process of roasting, differential attrition, sieving and polishing.
The stage wise process of manufacturing food grade guar gum is as under. It is very important to select guar split in this process. The split will be screened to clean and then it will be soaked to prehydrate in a double cone mixer. Prehydrating stage is very important in the process as it derives the rate of hydration of the final product.
The soaked splits, which has reasonably high moisture content, will be passed through Flacker to take them. The flaked guar split will be ground to desired particle size followed by drying of the material. The power will be screened through rotary screens to deliver required particle size. The oversize will be either recycle to main Ultra fine or regrind in separate regrind plant, as per viscosity requirement.
This stage helps to reduce the load at the grinder. The soaked splits are difficult to grind. Direct grinding of those generates more heat in the grinder which is not desired in the process as it results in insoluble or reduced hydration of the product. Through heating, grinding & polishing process the husk is separated from the endosperm halves and the refined Guar Gum split are obtained. Through grinding process the refined Guar split are then treated and converted into powder.
During the split manufacturing process, husk & germ are obtained which are used as a cattle feed as they are rich in protein. It is widely sold in the international market as “Guar Meal” and has contents of “Oil & Albuminoids”. These contents are about 50% in germ whereas it is about 25% in husks. Quality of the food grad guar gum powder is defined from its particle size, rate of hydration and the microbial in it. E412 guar gum is an important natural food supplement with high nutritional value.
Guar Gum: Stage wise Process
- First, the pods are dried in sunlight, manually separated from the seeds.
- The seeds are supplied to the industry for processing.
- Guar by-products, churi and korma are used for Cattle feed.
Undehusked Guar Splits
- The gum is commercially extracted from the seeds essentially by
a mechanical process of roasting, differential attrition, sieving and polishing.
- The seeds are broken and the germ is separated from the endosperm.
- Two halves of the endosperm are obtained from each seed and are known as Undehusked Guar Splits.
Refined Guar Splits
- Refined Guar Splits are obtained when the fine layer of fibrous material, which forms the husk, is removed and separated from the endosperm halves by polishing.
- The refined Guar Splits are then treated and finished into powders by a variety of routes and processing techniques depending upon the end product desired.
Guar Gum : Method of marking
- The grade designation mark shall be securely affixed or stenciled on each container in a manner approved by the Agricultural Marketing Adviser and shall also indicate the number of the certificate of authorisation issued to the packer by the Agricultural Marketing Adviser.
- The authorised packer may, after obtaining the prior approval of the Agricultural Marketing Adviser, mark his private trade mark on a container in a manner approved by the said officer, provided the private trade mark does not represent quality or grade of the Guar Gum different from that indicate by the grade designation mark affixed on the container in accordance with these rules.
- In addition to the grade designation mark every container shall be clearly marked with the following particulars, namely:-
- Date of packing
- Lot number
- Name and address of the packer
- Net weight
- Any other particulars as may be specified by the Agricultural Marketing Adviser.
Guar Gum : Method of Packing for export
- The Guar Gum shall be packed only in sound clean, dry and un-used containers made of B-twill just or in polythene bags placed in gunny bags or multi-ply craft paper sacks or any other material as may be approved by the Agricultural Marketing Adviser.
- The container shall be free from any insect infestation or fungus contamination.
- The container shall be free from any undesirable smell.
- The container shall be securely closed and sealed in the manner approved by the Agricultural Marketing Adviser.
- Each package shall contain Guar Gum of one trade description and one grade designation only.