CN109892550B - Dry and wet combined preparation method of instant corn nutritional snowflake tablets - Google Patents
Dry and wet combined preparation method of instant corn nutritional snowflake tablets Download PDFInfo
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- CN109892550B CN109892550B CN201910287455.9A CN201910287455A CN109892550B CN 109892550 B CN109892550 B CN 109892550B CN 201910287455 A CN201910287455 A CN 201910287455A CN 109892550 B CN109892550 B CN 109892550B
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Abstract
The invention relates to a dry method and wet method combined preparation method of instant corn nutrition snowflake, which comprises the following process steps: (1) the method comprises the steps of (1) preparing puffed corn meal by puffing dry corn grits by a dry method, (2) soaking 50-90 parts by weight of dry corn grits, (3) pulping 10-50 parts by weight of the puffed corn meal prepared in the step (1) and the corn grits soaked in the step (2), (4) pre-gelatinizing the corn meal by a roller, pre-drying the corn meal and pulping the corn meal to form corn paste, (5) drying the corn paste roller to obtain corn flakes with the water content of not more than 8%, (6) crushing and sieving the corn flakes, (7) sterilizing the corn flakes by microwaves, and (8) carrying out inner packaging, metal detection and outer packaging. The method can improve nutritive value of the corn flake, and has baking flavor and color of dry product, good mixing property, and reduced energy consumption.
Description
Technical Field
The invention belongs to the field of food processing, and particularly relates to a preparation method of an instant corn nutritional snowflake tablet.
Background
The corn has rich nutrition and health promotion effect. Corn contains not only carbohydrate, protein, fat, carotene and other nutrients, but also seven kinds of anti-aging agents, namely calcium, glutathione, vitamins, magnesium, selenium, vitamin E and fatty acid. Wherein, every 100 g of corn can extract nearly 300 mg of calcium, and the abundant calcium can achieve the efficacy of reducing blood pressure. Glutathione contained in corn is an anticancer factor which can be combined with some carcinogenic substances to cause the corn to lose carcinogenicity; glutathione is also a life-prolonging factor, and glutathione oxidase is generated under the participation of selenium, and has the functions of rejuvenating and delaying senility. The natural vitamin E has effects in promoting cell division, delaying aging, reducing serum cholesterol, preventing skin diseases, and relieving arteriosclerosis and brain function deterioration.
The corn and snowflake tablet is an instant food which is favored by consumers due to rich nutrition and convenient eating. The corn flake with corn grits as raw materials sold in the market at present is produced by a dry method-extrusion puffing method, namely, the corn grits are smashed and then added with water through a modulation process, and the materials are extruded and puffed under the conditions of high temperature and high pressure of 160-200 ℃ and 0.7-1.0 MPa, and are crushed and sieved to obtain the corn flake. The corn flake obtained by the method has baked fragrance and good color, but has the following problems: 1. the content of resistant starch is reduced, Maillard reaction occurs between reducing sugar and free amino acid in the corn due to high temperature and high pressure in the extrusion and expansion process, the content of the reducing sugar and the free amino acid is reduced, the effectiveness of the amino acid is weakened, and loss of vitamins can be caused under the friction of the corn grits at high temperature and high pressure and the evaporation of moisture, particularly the loss rate of water-soluble vitamins reaches 50%, so that the nutritional value of the corn grits is greatly reduced; 2. in the production process, under the action of high temperature, high pressure and high shearing force, hydrogen bonds among starch are broken, the starch is degraded, and the gelatinization characteristic of the starch is influenced, so that the mixing performance of the product is influenced; 3. the extrusion expansion method needs to be operated at high temperature and high pressure, and has higher energy consumption.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a dry method and wet method combined preparation method of an instant corn nutritional snowflake tablet, which can maintain the baking flavor and color of a dry product, simultaneously reserve the nutritional ingredients and flavor substances in corn to the maximum extent, improve the nutritional value of the corn snowflake tablet, improve the mixing property and taste of the corn snowflake tablet and reduce the energy consumption.
The invention relates to a dry method and wet method combined preparation method of instant corn nutritional snowflake tablets, which comprises the following process steps:
(1) dry puffing powder making method
Preparing puffed corn flour from normal color and color dry corn grits without mildew, odor and worm damage by dry puffing;
(2) soaking dry corn grits
Metering 50-90 parts by weight of dried corn grits which are not mildewed, have no peculiar smell, are not damaged by worms and have normal color, soaking the dried corn grits in drinking water at 30-60 ℃ for 2-4 h, and then removing the soaking water, wherein the weight of the drinking water is at least twice of that of the soaked dried corn grits;
(3) pulping
And (2) metering 10-50 parts by weight of the puffed corn flour prepared in the step (1), feeding the puffed corn flour and the corn grits soaked in the step (2) into a colloid mill feed hopper, adding drinking water, and grinding the mixture into slurry through a colloid mill, wherein the adding amount of the drinking water is 1: (2.2-3.2) metering, and controlling the fineness of the ground pulp to be 80-150 meshes;
(4) pregelatinization and predrying
Pre-gelatinizing and pre-drying the corn pulp obtained by grinding the pulp by using at least one pair of pre-gelatinizing rollers rotating in opposite directions to enable the corn pulp to form corn paste on the surface of the pre-gelatinizing roller, wherein the pre-gelatinizing roller takes high-pressure steam as a heat source, and the steam inlet quantity of the pre-gelatinizing roller is controlled to enable the surface temperature of the roller to be 145-150 ℃;
(5) drying
The corn paste formed by pre-gelatinization and pre-drying is carried to the surface of a drying roller in meshing transmission with a pre-gelatinization roller, and is heated and dried by the drying roller until the moisture content of corn flakes is not higher than 8.0 percent, the drying roller takes high-pressure steam as a heat source, and the steam inlet quantity of the drying roller is controlled to ensure that the surface temperature of the roller is 130-135 ℃;
(6) crushing and sieving
Conveying the corn flakes scraped from the drying roller to a crushing and screening machine, and crushing and screening to obtain corn flakes meeting the particle size requirement;
(7) sterilization
Sterilizing the obtained corn flakes by using microwave sterilization equipment, wherein the stacking thickness of the corn flakes in the microwave sterilization equipment is 1-2 cm;
(8) inner package, metal detection and outer package
And sequentially carrying out metering and inner packaging, metal detection and rejection of unqualified products and outer packaging on the sterilized corn snowflake slices to obtain the instant corn nutritional snowflake slice product.
According to the dry and wet combined preparation method of the instant corn nutrition snowflake, the outer diameter of the pre-pasting roller is smaller than the outer diameter of the drying roller, the rotating speed of the pre-pasting roller is controlled to be 20 r/min-50 r/min, and the rotating speed of the drying roller is controlled to be 2 r/min-5 r/min, so that the thickness of corn paste coated on the surface of the drying roller meets the process requirements, and the corn flake easy to break is obtained after drying.
According to the dry and wet combined preparation method of the instant nutritional corn flake, the fineness of the screen of the crushing and screening machine is 2-4 mm.
According to the dry and wet combined preparation method of the instant nutritional corn snowflake tablet, when microwave sterilization equipment is used for sterilization, the microwave power is 300W-800W, and the sterilization time is 20 s-100 s.
According to the dry and wet combined preparation method of the instant nutritional corn flake, the pressure of high-pressure steam of heat sources of the pre-pasting roller and the drying roller is 0.7 MPa-1.0 MPa.
The invention has the following beneficial effects:
1. because the method mixes and grinds the puffed corn flour prepared by the dry method and the soaked corn grits, and the temperature of the subsequent process is lower than that of the dry method (extrusion puffing method), the obtained corn snowflake not only furthest retains the nutrient components and flavor substances in the corn and improves the nutrient value, but also has the roasted flavor and color of the dry method product.
2. By adopting the combined process of roller pre-pasting, pre-drying and roller drying, not only can the continuous production be realized, the reconstitution property of the product is improved, but also the drying efficiency can be improved, and the energy consumption is reduced.
3. The method of the invention soaks the dry corn grits with drinking water for a certain time, thereby being beneficial to the subsequent grinding.
4. The obtained corn flake slices are sterilized by adopting a microwave sterilization technology, so that the corn flake slices are easy to control, safe and harmless, low in temperature, short in time and high in speed, and the nutritional ingredients and flavor substances of the corn flake slices are retained to the maximum extent.
Drawings
FIG. 1 is a schematic view of the installation of a pre-pasting roller and a drying roller used in the method of the present invention.
In the figure, 1 is a pre-pasting roller, and 2 is a drying roller.
Detailed Description
The dry and wet combined preparation method of the instant corn nutritional snowflake tablet according to the invention is further described by the following examples and the attached drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following embodiments, the twin-screw extrusion puffing machine, the single-screw extrusion puffing machine, the air flow puffing machine, the colloid mill, the pre-pasting roller, the drying roller, the crushing and screening machine, the tunnel type microwave sterilization equipment, the intermittent type microwave sterilization equipment, the full-automatic powder packaging machine, the metal detection device and the sealing machine can be purchased from the market.
The dry corn grits in the following examples are selected by pre-treatment to obtain normal color and no mildew, no odor, no worm damage. 1 part by weight is 0.5 kg.
Example 1
In this embodiment, the process for preparing the instant nutritional corn snowflake tablet comprises the following steps:
(1) dry puffing powder making method
Crushing the dried corn grits by using a crusher, sieving the crushed corn grits by using a 20-mesh sieve, then adding tap water into the sieved corn flour to modulate the corn flour so as to moisten the corn flour, wherein the adding amount of the tap water is 3.5 percent of the weight of the corn flour, then sending the modulated corn flour into a double-screw extrusion puffing machine, carrying out extrusion puffing at 180 ℃ and 0.8MPa, then crushing the extruded and puffed product by using the crusher, sieving the crushed product by using the 20-mesh sieve, and carrying out magnetic separation on the puffed corn flour obtained by sieving so as to obtain the puffed corn flour meeting the requirements;
(2) soaking dry corn grits
Weighing 50 parts by weight of mildew-free, odor-free, worm-eaten-free and normal-color dry corn grits, putting the dry corn grits into a stirring tank, adding 120 parts by weight of tap water with the temperature of 40 ℃, soaking for 3 hours under stirring at the stirring speed of 2r/min, and then removing water for soaking;
(3) pulping
50 parts by weight of the puffed corn flour prepared in the step (1) is metered, the puffed corn flour and the corn grits soaked in the step (2) are conveyed into a colloid mill feed hopper, tap water is added, and the corn grits are ground into a thick liquid by a colloid mill, wherein the amount of the tap water is metered according to 300 parts by weight of corn pulp obtained by grinding, the distance between a stator and a rotor of the colloid mill is adjusted, and the grinding fineness is controlled to be 150 meshes;
(4) pregelatinization and predrying
Pre-gelatinizing and pre-drying the corn pulp obtained by grinding the pulp by using two pairs of pre-gelatinizing rollers which rotate in opposite directions of 20r/min respectively to enable the corn pulp to form corn paste on the surface of the pre-gelatinizing rollers, wherein the pre-gelatinizing rollers use high-pressure steam of 0.8MPa as a heat source, and the steam inlet amount of the pre-gelatinizing rollers is controlled to enable the surface temperature of the rollers to be 146 ℃;
(5) drying
The two drying rollers are respectively meshed with two pairs of pre-pasting rollers which rotate oppositely (see figure 1), the rotating speed is 3r/min, corn paste formed by pre-pasting and pre-drying is brought to the surfaces of the drying rollers, the corn flakes are heated and dried by the drying rollers until the moisture content is 8.0 percent, the drying rollers use high-pressure steam of 0.8MPa as a heat source, and the steam inlet quantity of the drying rollers is controlled to ensure that the surface temperature of the rollers is 131 ℃;
(6) crushing and sieving
Conveying the corn flakes scraped from the drying roller to a crushing and screening machine through a screw conveyor, wherein the screen fineness of the crushing and screening machine is 2mm, and crushing and screening to obtain corn flake flakes with the particle size not more than 2 mm;
(7) sterilization
Sterilizing the obtained corn flakes by using tunnel type microwave sterilization equipment, wherein the stacking thickness of the corn flakes in the microwave sterilization equipment is 1.5cm, the microwave power is controlled at 800W during sterilization, and the sterilization time is controlled at 20 s;
(8) inner package, metal detection and outer package
The sterilized corn flake slices are automatically weighed, filled and sealed by a full-automatic powder packaging machine to complete inner packaging, then the corn flake slices completing the inner packaging are subjected to metal detection, unqualified products are removed, then the corn flake slices are packaged in an outer packaging bag, and the outer packaging bag is sealed by a sealing machine, wherein the outer packaging bag is required to be printed with date, and the code spraying requires clear writing and correct content.
Example 2
In this embodiment, the process for preparing the instant nutritional corn snowflake tablet comprises the following steps:
(1) dry puffing powder making method
Crushing the dry corn grits by using a crusher, sieving the crushed dry corn grits by using a 20-mesh sieve, then adding distilled water into the sieved corn flour to modulate the corn flour so as to moisten the corn flour, wherein the adding amount of the distilled water is 3.6 percent of the weight of the corn flour, then sending the modulated corn flour into a double-screw extrusion puffing machine, carrying out extrusion puffing at 160 ℃ and 0.9MPa, then crushing the extruded and puffed product by using the crusher, sieving the crushed product by using the 20-mesh sieve, and carrying out magnetic separation on the puffed corn flour obtained by sieving so as to obtain puffed corn flour meeting the requirements;
(2) soaking dry corn grits
Metering 70 parts by weight of mildew-free, odor-free, worm-eaten-free and normal-color dry corn grits, putting the dry corn grits into a soaking cylinder, adding 150 parts by weight of distilled water with the temperature of 50 ℃, soaking for 2.5 hours, and then removing soaking water;
(3) pulping
Metering 30 parts by weight of the puffed corn flour prepared in the step (1), feeding the puffed corn flour and the corn grits soaked in the step (2) into a colloid mill feed hopper, adding distilled water, and grinding the corn grits into a pulp by a colloid mill, wherein the adding amount of the distilled water is metered by that the weight of corn pulp obtained by grinding the pulp reaches 260 parts by weight, adjusting the distance between a stator and a rotor of the colloid mill, and controlling the grinding fineness to be 100 meshes;
(4) pregelatinization and predrying
Pre-gelatinizing and pre-drying the corn pulp obtained by grinding the pulp by using two pairs of pre-gelatinizing rollers which rotate in the opposite directions of 40r/min respectively to enable the corn pulp to form corn paste on the surface of the pre-gelatinizing rollers, wherein the pre-gelatinizing rollers use high-pressure steam of 0.9MPa as a heat source, and the steam inlet amount of the pre-gelatinizing rollers is controlled to enable the surface temperature of the rollers to be 148 ℃;
(5) drying
The two drying rollers are respectively meshed with two pairs of pre-gelatinization rollers rotating in opposite directions (see figure 1), the rotating speed is 2r/min, corn paste formed by pre-gelatinization and pre-drying is brought to the surface of the drying rollers, the corn paste is heated and dried by the drying rollers until the moisture content of the corn flakes is 7.0 percent, the drying rollers use high-pressure steam of 0.9MPa as a heat source, and the steam inlet amount of the drying rollers is controlled so that the surface temperature of the rollers is 133 ℃;
(6) crushing and sieving
Conveying the corn flakes scraped from the drying roller to a crushing and screening machine through a screw conveyor, wherein the fineness of a screen of the crushing and screening machine is 3mm, and crushing and screening to obtain corn flake with the particle size not more than 3 mm;
(7) sterilization
Sterilizing the obtained corn flakes by using intermittent microwave sterilization equipment, wherein the stacking thickness of the corn flakes in the microwave sterilization equipment is 2cm, the microwave power is controlled at 300W during sterilization, and the sterilization time is controlled at 100 s;
(8) inner package, metal detection and outer package
The sterilized corn flakes are automatically weighed, filled and sealed by a full-automatic powder packaging machine to complete inner packaging, then the corn flakes completing the inner packaging are subjected to metal detection, unqualified products are removed, then the corn flakes are packaged in an outer packaging bag, a sealing machine is used for sealing, production date needs to be sprayed on the outer packaging bag, and the sprayed codes require clear writing and correct content.
Example 3
In this embodiment, the process for preparing the instant nutritional corn flakes comprises the following steps:
(1) dry puffing powder making method
Adding tap water accounting for 4% of the dry corn grits by weight, puffing by using an airflow puffing machine under the pressure of 0.8MPa, crushing a puffed product by using a crusher, sieving by using a 20-mesh sieve, and carrying out magnetic separation on the puffed corn powder obtained by sieving to obtain puffed corn powder meeting the requirement;
(2) soaking dry corn grits
Metering 60 parts by weight of mildew-free, odor-free, worm-eaten-free and normal-color dry corn grits, putting the dry corn grits into a jacketed kettle, adding 120 parts by weight of 30 ℃ tap water, soaking for 4 hours, and removing soaking water;
(3) pulping
Metering 40 parts by weight of the puffed corn flour prepared in the step (1), feeding the puffed corn flour and the corn grits soaked in the step (2) into a colloid mill feed hopper, adding tap water, and grinding the corn grits into slurry by using a colloid mill, wherein the amount of the tap water is metered by 320 parts by weight of the corn slurry obtained by grinding the slurry, adjusting the distance between a stator and a rotor of the colloid mill, and controlling the grinding fineness to be 120 meshes;
(4) pregelatinization and predrying
Pre-gelatinizing and pre-drying the corn pulp obtained by grinding the pulp by using a pair of pre-gelatinizing rollers which rotate in opposite directions at 50r/min to form corn paste on the surface of the pre-gelatinizing roller, wherein the pre-gelatinizing roller takes high-pressure steam of 0.7MPa as a heat source, and the steam inlet amount of the pre-gelatinizing roller is controlled to enable the surface temperature of the roller to be 145 ℃;
(5) drying the mixture
The drying roller is one and is meshed with the pre-pasting rollers rotating in opposite directions (see figure 1), the rotating speed is 5r/min, corn paste formed by pre-pasting and pre-drying is brought to the surface of the drying roller, the corn flakes with the water content of 7.5 percent are heated and dried by the drying roller, the drying roller takes high-pressure steam with the pressure of 0.7MPa as a heat source, and the steam inlet amount of the drying roller is controlled to ensure that the surface temperature of the roller is 130 ℃;
(6) crushing and sieving
Conveying the corn flakes scraped from the drying roller to a crushing and screening machine by using a trolley, wherein the screen fineness of the crushing and screening machine is 2mm, and crushing and screening to obtain corn flake flakes with the particle size not more than 2 mm;
(7) sterilization
Sterilizing the obtained corn flakes by using tunnel type microwave sterilization equipment, wherein the stacking thickness of the corn flakes in the microwave sterilization equipment is 2cm, the microwave power is controlled at 500W during sterilization, and the sterilization time is controlled at 60 s;
(8) inner package, metal detection and outer package
The sterilized corn flake slices are automatically weighed, filled and sealed by a full-automatic powder packaging machine to complete inner packaging, then the corn flake slices completing the inner packaging are subjected to metal detection, unqualified products are removed, then the corn flake slices are packaged in an outer packaging bag, and the outer packaging bag is sealed by a sealing machine, wherein the outer packaging bag is required to be printed with date, and the code spraying requires clear writing and correct content.
Example 4
In this embodiment, the process for preparing the instant nutritional corn snowflake tablet comprises the following steps:
(1) dry puffing powder making method
Crushing the dry corn grits by using a crusher, sieving the crushed dry corn grits by using a 20-mesh sieve, then adding mineral water into the sieved corn flour to modulate the corn flour so as to moisten the corn flour, wherein the adding amount of the mineral water is 3.9 percent of the weight of the corn flour, then sending the modulated corn flour into a single-screw extrusion puffing machine, carrying out extrusion puffing at 170 ℃ and 1.0MPa, then crushing the extruded and puffed product by using the crusher, sieving the crushed product by using the 20-mesh sieve, and carrying out magnetic separation on the puffed corn flour obtained by sieving so as to obtain puffed corn flour meeting the requirements;
(2) soaking dry corn grits
Metering 90 parts by weight of mildew-free, odor-free, worm-eaten-free and normal-color dry corn grits, putting the dry corn grits into a soaking tank, adding 190 parts by weight of 60 ℃ mineral water, soaking for 2 hours, and then removing water for soaking;
(3) grinding pulp
Metering 10 parts by weight of the puffed corn flour prepared in the step (1), feeding the puffed corn flour and the corn grits soaked in the step (2) into a colloid mill feed hopper, adding mineral water, and grinding the corn grits into a pulp by a colloid mill, wherein the mineral water is metered by the weight of corn pulp obtained by grinding the pulp to 220 parts by weight, adjusting the distance between a stator and a rotor of the colloid mill, and controlling the grinding fineness to be 80 meshes;
(4) pregelatinization and predrying
Pre-gelatinizing and pre-drying corn pulp obtained by grinding the pulp by using a pair of pre-gelatinizing rollers which rotate oppositely at 20r/min to ensure that the corn pulp forms corn paste on the surface of the pre-gelatinizing rollers, wherein the pre-gelatinizing rollers use high-pressure steam of 1.0MPa as a heat source, and the steam inlet quantity of the pre-gelatinizing rollers is controlled to ensure that the surface temperature of the rollers is 150 ℃;
(5) drying
The drying roller is one and is meshed with the pre-pasting rollers rotating in opposite directions (see figure 1), the rotating speed is 2r/min, corn paste formed by pre-pasting and pre-drying is brought to the surface of the drying roller, the corn flakes with the water content of 5.0 percent are heated and dried by the drying roller, the drying roller takes high-pressure steam with the pressure of 1.0MPa as a heat source, and the steam inlet amount of the drying roller is controlled to ensure that the surface temperature of the roller is 135 ℃;
(6) crushing and sieving
Conveying the corn flakes scraped from the drying roller to a crushing and screening machine by using a cart, wherein the fineness of a screen of the crushing and screening machine is 4mm, and crushing and screening to obtain corn flakes with the particle size not more than 4 mm;
(7) sterilization
Sterilizing the obtained corn flakes by using intermittent microwave sterilization equipment, wherein the stacking thickness of the corn flakes in the microwave sterilization equipment is 1cm, the microwave power is controlled at 700W during sterilization, and the sterilization time is controlled at 60 s;
(8) inner package, metal detection and outer package
The sterilized corn flake slices are automatically weighed, filled and sealed by a full-automatic powder packaging machine to complete inner packaging, then the corn flake slices completing the inner packaging are subjected to metal detection, unqualified products are removed, then the corn flake slices are packaged in an outer packaging bag, and the outer packaging bag is sealed by a sealing machine, wherein the outer packaging bag is required to be printed with date, and the code spraying requires clear writing and correct content.
Example 5
In this embodiment, the process for preparing the instant nutritional corn snowflake tablet comprises the following steps:
(1) dry puffing powder making method
Crushing the dry corn grits by using a crusher, sieving the crushed dry corn grits by using a 20-mesh sieve, then adding distilled water into the sieved corn flour to modulate the corn flour so as to moisten the corn flour, wherein the adding amount of the distilled water is 4.0 percent of the weight of the corn flour, then sending the modulated corn flour into a double-screw extrusion puffing machine, extruding and puffing at 180 ℃ and 0.8MPa, then crushing the extruded and puffed product by using the crusher, sieving the crushed product by using the 20-mesh sieve, and magnetically separating the puffed corn flour obtained by sieving to obtain the puffed corn flour meeting the requirements;
(2) soaking dry corn grits
Weighing 80 weight parts of mildew-free, odor-free, moth-free and normal color dry corn grit, placing into a stirring tank, adding 170 weight parts of distilled water at 50 ℃, soaking for 2h under stirring at a stirring speed of 2r/min, and removing water for soaking;
(3) grinding pulp
Metering 20 parts by weight of the puffed corn flour prepared in the step (1), feeding the puffed corn flour and the corn grits soaked in the step (2) into a colloid mill feed hopper, adding distilled water, and grinding the corn grits into a pulp by a colloid mill, wherein the adding amount of the distilled water is metered by that the weight of corn pulp obtained by grinding the pulp reaches 280 parts by weight, adjusting the distance between a stator and a rotor of the colloid mill, and controlling the grinding fineness to be 110 meshes;
(4) pregelatinization and predrying
Pre-gelatinizing and pre-drying the corn pulp obtained by grinding the pulp by using a pair of pre-gelatinizing rollers which rotate in opposite directions at 30r/min to form corn paste on the surface of the pre-gelatinizing roller, wherein the pre-gelatinizing roller takes high-pressure steam of 0.85MPa as a heat source, and the steam inlet quantity of the pre-gelatinizing roller is controlled to ensure that the surface temperature of the roller is 147 ℃;
(5) drying the mixture
The drying roller is one and is meshed with the pre-pasting rollers rotating in opposite directions (see figure 1), the rotating speed is 4r/min, corn paste formed by pre-pasting and pre-drying is brought to the surface of the drying roller, the corn flakes with the water content of 6.5 percent are heated and dried by the drying roller, the drying roller takes high-pressure steam with the pressure of 0.85MPa as a heat source, and the steam inlet amount of the drying roller is controlled to ensure that the surface temperature of the roller is 133 ℃;
(6) crushing and sieving
Conveying the corn flakes scraped from the drying roller to a crushing and screening machine by using a cart, wherein the fineness of a screen of the crushing and screening machine is 3mm, and crushing and screening to obtain corn flakes with the particle size not more than 3 mm;
(7) sterilization
Sterilizing the obtained corn flakes by using tunnel type microwave sterilization equipment, wherein the stacking thickness of the corn flakes in the microwave sterilization equipment is 1cm, the microwave power is controlled at 600W during sterilization, and the sterilization time is controlled at 55 s;
(8) inner package, metal detection and outer package
The sterilized corn flake slices are automatically weighed, filled and sealed by a full-automatic powder packaging machine to complete inner packaging, then the corn flake slices completing the inner packaging are subjected to metal detection, unqualified products are removed, then the corn flake slices are packaged in an outer packaging bag, and the outer packaging bag is sealed by a sealing machine, wherein the outer packaging bag is required to be printed with date, and the code spraying requires clear writing and correct content.
Claims (3)
1. A dry method and wet method combined preparation method of instant corn nutrition snowflake is characterized by comprising the following process steps:
(1) dry puffing powder making method
Dry corn grits which are not mildewed, have no peculiar smell, are not damaged by worms and have normal color are puffed by a dry method to prepare puffed corn flour;
(2) soaking dry corn grits
Metering 50-90 parts by weight of dried corn grits which are free from mildew and odor and are not damaged by worms and have normal color, soaking the dried corn grits for 2-4 hours in drinking water at 30-60 ℃, and then removing the soaking water, wherein the weight of the drinking water is at least twice of that of the soaked dried corn grits;
(3) pulping
Metering 10-50 parts by weight of the puffed corn flour prepared in the step (1), feeding the puffed corn flour and the corn grits soaked in the step (2) into a colloid mill feed hopper, adding drinking water, and grinding the mixture into slurry through the colloid mill, wherein the adding amount of the drinking water is 1: (2.2-3.2) metering, and controlling the fineness of the ground pulp to be 80-150 meshes;
(4) pregelatinization and predrying
Pre-gelatinizing and pre-drying corn pulp obtained by grinding the pulp by using at least one pair of pre-gelatinizing rollers rotating in opposite directions to enable the corn pulp to form corn paste on the surface of the pre-gelatinizing rollers, wherein the pre-gelatinizing rollers use steam with the pressure of 0.7 MPa-1.0 MPa as a heat source, the steam inlet amount of the pre-gelatinizing rollers is controlled to enable the surface temperature of the rollers to be 145 ℃ to 150 ℃, and the rotating speed of the pre-gelatinizing rollers is controlled to be 20 r/min-50 r/min;
(5) drying
The corn paste formed by pre-gelatinization and pre-drying is brought to the surface of a drying roller meshed with a pre-gelatinization roller, and is heated and dried by the drying roller until the moisture content of corn flakes is not higher than 8.0%, the drying roller takes steam with the pressure of 0.7 MPa-1.0 MPa as a heat source, the steam inlet amount of the drying roller is controlled to enable the surface temperature of the roller to be 130-135 ℃, and the rotating speed of the drying roller is controlled to be 2-5 r/min;
(6) crushing and sieving
Conveying the corn flakes scraped from the drying roller to a crushing and screening machine, and crushing and screening to obtain corn flakes meeting the particle size requirement;
(7) sterilization
Sterilizing the obtained corn flakes by using microwave sterilization equipment, wherein the stacking thickness of the corn flakes in the microwave sterilization equipment is 1 cm-2 cm;
(8) inner package, metal detection and outer package
And sequentially carrying out metering and inner packaging, metal detection and rejection of unqualified products and outer packaging on the sterilized corn snowflake slices to obtain the instant corn nutritional snowflake slice product.
2. The dry-process and wet-process combined preparation method of the instant corn nutritional snowflake tablet as claimed in claim 1, characterized in that the fineness of the screen mesh of the crushing and screening machine is 2 mm-4 mm.
3. The dry and wet combined preparation method of the instant corn nutritional snowflake tablets according to claim 1 or 2, characterized in that when microwave sterilization equipment is used for sterilization, the microwave power is 300W-800W, and the sterilization time is 20 s-100 s.
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| CN201910287455.9A CN109892550B (en) | 2019-04-11 | 2019-04-11 | Dry and wet combined preparation method of instant corn nutritional snowflake tablets |
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