NL8501690A - METHOD FOR PREPARING AND USING GRANULATED DRIED SKIN MILK. - Google Patents

Description

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Process for preparing and using granulated dried skim milk.

The invention relates to a method for drying skim milk, with the aim that the granulated dried skim milk product can also be used as a high-quality foodstuff, preferably after fattening of cattle, even after long storage.

As is known, skimmed milk powder is prepared from skimmed whole milk, for example by spray drying, under normal human food conditions.

However, it is also known from German Offen-10 legungsschrift 26 40 021 that skimmed milk powder is used as a mixture, denatured, spray dried with silicic acid as food for livestock. The addition of silicic acid improves the ensilation property and ensures longer silo storage. According to German Auslegeschrift 15 18 12 350, a feed for rearing calves based on milk fat exchange, consisting of skimmed milk powder, vegetable and animal fats, emulsifiers and highly dispersed silicic acid, is prepared. The addition of silicic acid prevents creaming, promotes the flow behavior of the product and improves storage stability.

German Offenlegungsschrift 17 92 614 discloses a method for preparing feed milk, wherein a milk type, for example powdered skimmed milk, as a mixture with at least 25% dry mass content, concentrate, protein carrier and substances with a certain effect (Wirkstoffen ) is acquired. Provided that the feed milk reaches a total of at least 25% dry mass, a longer shelf life is also available in weather wraps without disintegration.

It is common to all known solutions to use skimmed milk powder and to extend the shelf life by improving additives, for example, tartaric acid, or by improving physiological compatibility.

The object of the invention is to reduce the total cost of preparation in the preparation of the dry skimmed milk product and, due to its condition in the batch, < ~ I * -2- higher energy output and thus better utilization of the product.

The object of the invention is to prepare a dried skim milk, which is distinguished by a long shelf life and thus good storage capacity and further in metabolic processes by good physiological tolerance during a delayed energy release and simple dosability.

According to the invention, the problem is solved by heating skim milk with a solid content of 25-75% by mass at 303 ° K to 345 ° K (30 ° C-72 ° C) in a storage container and maintaining the temperature and spraying the solid content with an overpressure of 2 to 15 atmospheres (196-1470 KPa) in a fluidized bed. At this product temperature of 328 ° K to 338 ° K (55-65 ° C) and a residence time of at least 0.5 hours, the product is further granulated with a pure density of at least> 1.15 g / cm3. Continuous or quasi-continuous is added to an average diameter of the seed on <0.45 x granules 9 times' granules, proprietary product with a moisture content of up to 11% in the amount of <40% of the applied granulate. Subsequently, the cooling of the granulate applied on 5 mm is carried out at <308 ° K (3i ° C).

The granulate preparation process is carried out continuously, in that a second storage container for the skimmed milk to be treated is already prepared during the actual granulation method, in order to prevent a mixing of skimmed milk still in stock in the container and thereby precluded. nor can creeping decay occur. It must be ensured that a continuous flow of the heated skimmed milk is maintained when switching from one container to another container. The skimmed milk thus prepared becomes active only as a granulated, dried skimmed milk product, fulfilling the task of the invention, when the minimum residence time is observed and the pure density is attained at the predetermined product temperature. Due to the correspondingly obtained pure density, a slow dissolution of the 85 0 1 6 © 9

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-3- product during digestion and thus achieves good tolerability and usability.

Implementation example. Skimmed milk with a solid content of approximately 50% by mass is supplied to a container with a capacity of 200 liters within 1 hour. The skim milk is heated to 313 ° K (40 ° C). By means of a metering pump, the material is continuously fed through a pipeline at about 105 kg / h to a two-material spray nozzle which is arranged in a fluidized-bed device. The temperature and the solid concentration remain constant. The skim milk is sprayed onto the solid surface of the fluidizing granulates with 3 atmospheres (296 KPa) in the fluidized layer, causing them to grow. The temperature of the solid granules in the fluidized bed is approximately 333 ° K (60 ° C) while the air entry temperature is 408 ° K (135 ° C). In order to maintain the granulation drying process, approximately 15 kg / h of typical granules with an average diameter of 2 mm and a moisture content of 0.1 mass% are fed continuously to the fluidized bed layer.

After the granules in the layer have reached a diameter of 55 mm, after a residence time of 2 hours, they leave the fluidized layer dust-free via a classifying discharge.

The granulates are moved via a bucket paddle wheel into a flowing bed cooler. Here, the granules are cooled by ambient air drawn in at 303 ° K (30 ° C). The finished granulation product stream of about 73 kg / h is separated into two product streams, 58 kg / h being fed to the storage as final product with a water content of 9.1 mass% and a diameter of 5 mm, while the remaining product stream of 15 kg / h in a suitable comminution unit to be comminuted to an average diameter of 2 mm and to maintain the granulation process in the fluidized bed

is being returned. The method can be carried out continuously

because during the granulation drying process already! i

a second container is being prepared. As a result, I

40 ensures that no decomposition processes for the granulation 350 1 89 0 | 4 + -4- drying occur.

- conclusion - 8501690

Claims (1)

Method for preparing and dispensing granulated-dried skim milk as a high quality food, preferably for cattle breeding, characterized in that skim milk with a solid content of 25-75 mass% 5 is heated at .303 ° K to 345 ° K (30 ° C to 72 ° C) and sprayed in a vortex layer at a temperature of 328 ° K while maintaining the temperature and the solid content with overpressure. to 338 ° K (55 to 65 ° C) and a residence time of> 0.5 hours, the product is further granulated with a pure density of at least 1/15 g / cm3, after which the cooling takes place from the 5 mm classified discharged granulates up to <308 ° K (35 ° C), in which the granulated, granulated, characteristic product with a moisture content of up to 11% is ground continuously or quasi-continuously, on an average diameter of the germs or <0.45 x 15 ^ granulate in the amount of <40% of the discharged granulate is released and. j 850 1 89 0 e