Method for producing of dried granulated pumpkin

FIELD: food-processing industry.

SUBSTANCE: method involves preliminarily cutting, pressing and granulating raw material, with juice being expelled at grinding and pressing stages; drying resulted granules by providing infrared power feeding from each side, with initial content of dry substances in pumpkin granules constituting 16%, diameter of granules making 0.004 m, and heat flux density making 2.69 kW/m2.

EFFECT: increased yield of dry product, increased nutrient value and content of vitamins.

2 tbl, 3 ex

 

This invention relates to food industry, namely, to obtain dry vegetable concentrates, mainly used in the canning industry for the production of biologically valuable products, canned food, and also as additives in food, feed, medical and veterinary products, recommended for all population groups, including diet.

A known method of drying moisture materials [see RF patent №96116944, 1998], including drying the material under the influence of infrared radiation at the first stage and douchka in the second stage, and at the first stage, the maximum intensity of the radiation is exposed to one side of the material, and the minimum is another, and the second stage changes the irradiation intensity of the parties.

This method does not allow for removal of free and Marosvasarhely moisture more economical hydro-mechanical means (grinding, pressing and the like), the creation of the spatial power supply that causes the multi-stage drying. In addition, this method is not ensured highly developed surface heat and mass transfer, resulting in lower productivity and quality of finished products.

Closest to the proposed method is a method of production of dry granulated product on the basis of ka is the Tophel, which is mixed with a powder of a pumpkin, including cleaning of the raw material, its grinding, boiling, and mixing with other components and granulating with simultaneous wetting and subsequent drying of the granules in the vortex layer [see RF patent №97117731, 1999] is a prototype.

This method of drying is not possible to obtain dry products from pumpkin high quality and relatively large output of finished product due to uneven drying of the particles due to surface energy supply, low efficiency of internal storage, local nedosypanija large and burning of small particles, high shortening and deformation of the shape of granules, low degree of extraction of moisture during grinding and the need for additional moistening the mixture, and also because of the significant amount of auxiliary vehicle equipment for dust collection, aspiration and losses in the separation of the finished product, propensity for aggregation (sticking together) of the material, the difficulties of generating the set of output parameters in the vortex drying.

The technical problem is to intensify the operation of drying the granulated product.

The technical result of the present invention is to increase the yield of dry product, maximum preservation of its nutritional value and vitamins.

It is achieved by a method of obtaining dry Gras is Ulyanova product includes a pre-grinding, pressing and pelletizing of raw materials, resulting in part of the liquid (juice) is separated at the stage of grinding and pressing, which are less energy-intensive operations in comparison with drying, and is sent for further processing. The obtained granules are dried at a comprehensive infrared power supply with an initial solids content in pumpkin granules from 15 to 18%. The method is carried out using infrared light (IR) emitters type KGT-220-I000 at a voltage of from 130 to 160 In (wavelength corresponding to the maximum radiation from 1.30 to 1.56 μm), diameter from 0.002 to 0.008 m m; density of the heat flux of 2.5 kW/m2up to 3 kW/m2. When you eat this dry product can reach N=26 kg/(m2h).

A concrete implementation of the proposed method is illustrated by examples of its implementation.

Example 1

Pumpkin varieties "Ordinary" washed, cleansed from the skin, remove the seed slot. Then was subjected to granulation with prepressing (to a moisture content of 84%). The obtained granules were:

the equivalent diameter d=0,004 m

the length l=0,01 m

Drying was carried out at a heat flux E=2,69 kW/m2that λ=1,34 microns.

However, the performance was P=14,6 kg/m2.

Example 2

Pumpkin varieties "Ordinary" washed, cleansed from the skin, remove the seed slot. Then subjected Grand is the place with prepressing (to a moisture content of 84%). The obtained granules were:

the equivalent diameter d=0,007 m

length l=0,015 m

Drying was carried out at a heat flux E=4,01 kW/m2that λ=1,16 microns.

However, the performance was P=18.7 kg/m2.

Example 3

Pumpkin varieties "Ordinary" washed, cleansed from the skin, remove the seed slot. Then was subjected to granulation with prepressing (to a moisture content of 84%). The obtained granules were:

the equivalent diameter d=0,004 m

length l=0,01 m

Drying was carried out at a heat flux E=2,69 kW/m2that λ=1,45 mm.

However, the performance was N=26 kg/m2.

The effectiveness of the method is illustrated in the comparative tables 1, 2, which are comparative indicators of the chemical composition of dry products on the basis of the pumpkin.

Thermal processing of plant products containing appreciable amount of pectins, aimed at the destruction of the secondary structure of pectin and partial release of water. This process begins when the temperature is above 60°and then accelerated to about 2 times for every 10°C temperature increase. In the result, the mechanical strength is reduced more than 10 times.

The mechanical strength of the herbal products depends on the content of water in them. The less the product of free water, the greater its strength when other conditions are equal. In table 1 is shown the chemical composition of the powders and some of the products on the basis of pumpkin, dried by convective drying method.

Table 1
The chemical composition of the powders and some of the products on the basis of pumpkin, %
Name of productWaterSugarPectinOrganic. acidAshNitrogenous substancesFiberβ-carotene, mg/%
Pumpkin powder6-840-575-70,9-1,28-109-1410-1219-50
Porridge pumpkin6-838-391,6-1,80,2-0,41,5-221-233,7-45,7-15

Experimental verification of the alignment process of granulation and drying gourds. Table 2 shows the chemical composition of the finished product.

Table 2
The chemical composition of the granulated dry pumpkin, %.
WaterSugarPectinOrganic. acidAshNitrogenous substancesFiberB2; -carotene, mg/%
7-1045-607-90,9-1,39-117-129-1420-55

Positive effect - this method allows to reduce the drying time and provides complete safety of vitamins and active substances. Recycled products decreases by weight 8-10 times, and the amount of 3-4 times, acquires the capacity for long-term storage at normal (room) conditions and relatively rapid recovery in the water, a comparative analysis of feedstock and dry powders obtained by other methods of dehydration shows that the content β-carotene, fiber, ash, pectin, sugar content exceeds counterparts and this confirms the validity of the choice of method of dehydration.

The method of obtaining the dry granulated pumpkin, including preliminary grinding, extrusion and granulation of raw materials, while at the stages of grinding and pressing separates the part of the juice, and after granulation, the product is subjected to drying at a comprehensive infrared power supply with an initial solids content in pumpkin seed pellets 16%, while the diameter of the granules from 0.004 m, and the density of the heat flow 2,69 kW/m2.



 

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