Preparation method of milk powder and milk powder

Abstract

The present invention provides a milk powder preparation method and milk powder wherein the preparation method comprises the following steps: step S1: according to the weight ratio of nutrient powder to a first part of milk powder base material being (1: 4.5)-(1: 5.5), the nutrient powder and the first part of milk powder base material are premixed and uniformly stirred to obtain a premix bag; s2, splitting the premixed material bag into a plurality of sub-material bags, and adding the sub-material bags into a second part of milk powder base material in batches until all the sub-material bags are added into the milk powder base material to obtain milk powder; wherein the sub-material bags in each batch are added into the milk powder base material and are uniformly stirred. According to the invention, the distribution uniformity of nutrients in the obtained milk powder is improved, the consistency of the milk powder is improved, and the consumer experience is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of dairy product processing, and in particular to a method for preparing milk powder and milk powder. Background Art

[0002] In current milk powder production, the mixing uniformity of trace nutrients is an important factor in ensuring product quality.

[0003] The existing method of adding micronutrients is to add a small amount of micronutrients to the milk powder base material at one time and stir evenly. The existing one-time adding method easily leads to uneven distribution of micronutrients, poor consistency of milk powder and poor consumer experience. Summary of the invention

[0004] The embodiment of the present invention provides a method for preparing milk powder and milk powder, so as to solve the problem that the existing method of adding micronutrients is to add micronutrients to the milk powder base material at one time and stir evenly. The existing one-time adding method easily leads to uneven distribution of micronutrients, poor consistency of milk powder and poor consumer experience.

[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows:

[0006] In a first aspect, an embodiment of the present invention provides a method for preparing milk powder, comprising:

[0007] Step S1: premixing the nutrient powder with the first part of the milk powder base material according to a weight ratio of the nutrient powder to the first part of the milk powder base material of (1:4.5)-(1:5.5), and stirring them evenly to obtain a premixed material package;

[0008] Step S2: split the premixed material package into multiple sub-material packages, and add the sub-material packages to the second part of the milk powder base in batches until all the sub-material packages are added to the milk powder base to obtain milk powder; wherein each batch of the sub-material packages added to the milk powder base is stirred evenly.

[0009] Optionally, the weight ratio M of a single sub-material package to the second part of the milk powder base material satisfies: M≤0.1.

[0010] Optionally, the milk powder base includes milk powder and lactose;

[0011] Step S1 includes:

[0012] The nutrient powder and lactose are premixed according to a weight ratio of nutrient powder to lactose of (1:4.5)-(1:5.5) to obtain the premix package.

[0013] Optionally, premixing the nutrient powder with the first part of the milk powder base and stirring evenly comprises:

[0014] Add a variety of nutrient powders to the first part of the milk powder base in batches in order from small to large particle size, until all the nutrient powders are added to the first part of the milk powder base; wherein each batch of nutrient powders is stirred evenly after being added to the base.

[0015] Optionally, in the process of premixing the nutrient powder with the first part of the milk powder base and stirring them uniformly, wet spraying is performed on the premixed powder of the nutrient powder and the milk powder base.

[0016] Optionally, step S2 includes:

[0017] Step S3: mixing the milk powder.

[0018] Optionally, a double-screw mixer and / or a horizontal mixer is used to perform the mixing process on the milk powder.

[0019] Optionally, the nutrient powder includes at least one powder of vitamin A, vitamin D, vitamin E, vitamin C, B vitamins, lutein, calcium, iron, copper, magnesium, zinc, soluble dietary fiber, and probiotics.

[0020] Optionally, the milk powder base comprises milk powder;

[0021] The milk powder base also includes at least one of lactose, solid corn syrup, glucose, whey powder, white sugar, maltose and sugar alcohol.

[0022] In a second aspect, an embodiment of the present invention provides a milk powder prepared using the milk powder preparation method described in any one of the first aspects.

[0023] In an embodiment of the present invention, step S1: premixing and stirring the nutrient powder with the first part of the milk powder base material according to the weight ratio of the nutrient powder to the first part of the milk powder base material is (1:4.5)-(1:5.5) to obtain a premixed material package, so that the nutrient powder is premixed with a small dose of milk powder base material first, and the nutrient powder is more easily stirred evenly in a small amount of milk powder base material, thereby improving the uniformity of distribution of micronutrients. Further, step S2: splitting the premixed material package into a plurality of sub-material packages, and adding the sub-material packages to the second part of the milk powder base material in batches until all the sub-material packages are added to the milk powder base material to obtain milk powder; wherein each batch of the sub-material packages are added to the milk powder base material and stirred evenly, so that the nutrient powder is mixed and stirred evenly with a large dose of milk powder base material, thereby improving the uniformity of nutrient distribution in the obtained milk powder, improving the consistency of the milk powder, and improving the consumer experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 The figure is a schematic diagram of a process for preparing milk powder according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The terms "first", "second", etc. of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0028] In the technical solution of the present disclosure, words such as “connect”, “couple” or “connected” are not limited to physical or mechanical connections, but may include electrical connections.

[0029] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] It should be noted that the raw materials used in the present invention can be obtained commercially, and any range recorded in the present invention includes the end value and any numerical value between the end values ​​and any sub-range formed by the end value or any numerical value between the end values.

[0031] The present invention provides a method for preparing milk powder. Figure 1 As shown, Figure 1 The present invention is a schematic flow diagram of a method for preparing milk powder according to an embodiment of the present invention, comprising:

[0032] Step S1: premixing the nutrient powder with the first part of the milk powder base material according to a weight ratio of the nutrient powder to the first part of the milk powder base material of (1:4.5)-(1:5.5), and stirring them evenly to obtain a premixed material package;

[0033] Step S2: split the premixed material package into multiple sub-material packages, and add the sub-material packages to the second part of the milk powder base in batches until all the sub-material packages are added to the milk powder base to obtain milk powder; wherein each batch of the sub-material packages added to the milk powder base is stirred evenly.

[0034] In some embodiments of the present invention, the premixing time is optionally 5-20 minutes, which can ensure that the components are fully mixed and avoid equipment loss and resource waste caused by too long mixing time.

[0035] In some embodiments of the present invention, optionally, the sub-material packages are added to the second part of the milk powder base in batches, that is, at least one sub-material package is added to the second part of the milk powder base in each batch. In some optional embodiments, one sub-material package is added to the second part of the milk powder base in each batch.

[0036] Nutrient powder accounts for a small proportion of the total weight of milk powder. In practical applications, nutrient powder needs to be added to the milk powder base. The existing preparation method is to add all nutrient powder to the milk powder base at one time and mix and stir evenly, which has the problem of poor uniformity.

[0037] In an embodiment of the present invention, step S1: premixing and stirring the nutrient powder with the first part of the milk powder base material according to the weight ratio of the nutrient powder to the first part of the milk powder base material is (1:4.5)-(1:5.5) to obtain a premixed material package, so that the nutrient powder is premixed with a small dose of milk powder base material first, and the nutrient powder is more easily stirred evenly in a small amount of milk powder base material, thereby improving the uniformity of distribution of micronutrients. Further, step S2: splitting the premixed material package into a plurality of sub-material packages, and adding the sub-material packages to the second part of the milk powder base material in batches until all the sub-material packages are added to the milk powder base material to obtain milk powder; wherein each batch of the sub-material packages are added to the milk powder base material and stirred evenly, so that the nutrient powder is mixed and stirred evenly with a large dose of milk powder base material, thereby improving the uniformity of nutrient distribution in the obtained milk powder, improving the consistency of the milk powder, and improving the consumer experience.

[0038] In some embodiments of the present invention, optionally, a weight ratio M of a single sub-material package to the second part of the milk powder base material satisfies: M≤0.1.

[0039] It should be noted that in some optional embodiments, one sub-material package is added to the milk powder base in each batch. In combination with the weight ratio M of the sub-material package to the milk powder base in the embodiment of the present application, M≤0.1, that is, the weight ratio of the nutrient powder and the premix of the milk powder base added to the milk powder base in each batch to the weight of the milk powder base is less than or equal to 10%, which is conducive to improving the uniformity of the nutrient powder in the milk powder.

[0040] In some embodiments of the present invention, optionally, the milk powder base comprises milk powder and lactose;

[0041] Step S1 includes:

[0042] The nutrient powder and lactose are premixed according to a weight ratio of nutrient powder to lactose of (1:4.5)-(1:5.5) to obtain the premix package.

[0043] In practical applications, the lactose content in milk powder is less than that in milk powder. Through the embodiment of the present invention, step S1 realizes the premixing of nutrient powder and lactose. In the subsequent step S2, the sub-material package is added to the second part of the milk powder base in batches, that is, the nutrient powder is first mixed with a small amount of lactose in the milk powder base, and then mixed with the milk powder base as a whole. The embodiment of the present invention further refines the mixing order to achieve a mixing gradient from a small content to a large content, which is conducive to improving the mixing uniformity. It should be noted that in step S2, the milk powder base of the second part includes milk powder and lactose; or, in some optional embodiments, the lactose content in the milk powder is low, and the nutrients have been premixed with all the lactose in step S1, then the milk powder base of the second part in step S2 only includes milk powder.

[0044] In some embodiments of the present invention, optionally, premixing the nutrient powder with the first part of the milk powder base and stirring them uniformly comprises:

[0045] Add a variety of nutrient powders to the first part of the milk powder base in batches in order from small to large particle size, until all the nutrient powders are added to the first part of the milk powder base; wherein each batch of nutrient powders is stirred evenly after being added to the base.

[0046] In an embodiment of the present invention, a plurality of nutrient powders are added to the milk powder base in batches in the order of particle size from small to large, until all the nutrient powders are added to the milk powder base; wherein each batch of nutrient powders is stirred evenly after being added to the base, thereby further refining the mixing order, achieving a mixing gradient from small particle size to gradually small particle size, and improving mixing uniformity.

[0047] In some embodiments of the present invention, optionally, during the process of premixing and evenly stirring the nutrient powder with the first part of the milk powder base, wet spraying is performed on the premixed powder of the nutrient powder and the milk powder base, which is beneficial to improve the adhesion of the powder and reduce the powder scattering during the mixing process.

[0048] In some optional embodiments, the humidity of the wet spray is preferably 0.1%-0.3%. In this humidity range, the adhesion of the powder can be improved, the powder scattering during the mixing process can be reduced, and the powder can be prevented from agglomerating and deteriorating due to moisture. In some embodiments, the humidity of the wet spray can be further preferably 0.1%.

[0049] In some embodiments of the present invention, optionally, step S2 includes:

[0050] Step S3: mixing the milk powder.

[0051] In the embodiment of the present invention, after the premixing in step S1 and the batch mixing in step S2, the milk powder obtained by the batch mixing is further mixed as a whole in step S3, which is beneficial to improving the uniformity of the nutrient powder in the milk powder.

[0052] In some embodiments of the present invention, optionally, a double-screw mixer and / or a horizontal mixer is used to perform the mixing process on the milk powder.

[0053] The double-screw mixer consists of two interlaced spiral blades. The materials in the mixing barrel produce complex flow and shearing through the rotation of the spiral blades, thereby achieving uniform mixing of the materials. The spiral design can effectively transport the materials from both ends to the middle, and at the same time, it can make the materials constantly flip and interlace during the mixing process, thereby enhancing the mixing effect.

[0054] The horizontal mixer stirs and mixes the materials through the stirring device (such as propeller, blade, etc.) inside the horizontal mixer. The materials flow and shear in the mixing barrel through the rotation of the stirring device, thereby achieving uniform mixing. The design of the horizontal mixer allows the materials to flow freely in the barrel, enhancing the mixing effect.

[0055] In the embodiment of the present invention, a double-screw mixer and / or a horizontal mixer is used to perform the mixing process on the milk powder, which is beneficial to improving the mixing uniformity.

[0056] In some embodiments of the present invention, optionally, the nutrient powder includes at least one of vitamin A, vitamin D, vitamin E, vitamin C, B vitamins, lutein, calcium, iron, copper, magnesium, zinc, soluble dietary fiber, and probiotics. The addition of the above nutrient powder is conducive to the preparation of high-nutrition milk powder in the embodiments of the present invention.

[0057] In some embodiments of the present invention, optionally, the soluble dietary fiber includes at least one of inulin, oligofructose, resistant starch, and resistant dextrin.

[0058] In some embodiments of the present invention, optionally, the milk powder base comprises milk powder;

[0059] The milk powder base also includes at least one of lactose, solid corn syrup, glucose, whey powder, white sugar, maltose and sugar alcohol.

[0060] In some embodiments of the present invention, optionally, in addition to milk powder, the milk powder base also includes at least one of lactose, solid corn syrup, glucose, whey powder, white sugar, maltose, and sugar alcohol. The above embodiments are conducive to improving the adaptability of milk powder to consumers with low sugar requirements, especially for consumers with lactose intolerance.

[0061] The following is a description with reference to specific embodiments.

[0062] Example 1

[0063] Standard formula;

[0064] Material composition, in proportion to the weight of milk powder:

[0065] Skim milk powder: 70%;

[0066] Vitamin A: 0.1%;

[0067] Calcium phosphate: 1%;

[0068] Ferrous sulfate: 0.5%;

[0069] Lactose: 28.4%;

[0070] Preparation steps:

[0071] 1. Premixing: Vitamin A, calcium phosphate and ferrous sulfate (all three are micronutrients, corresponding to the nutrient powder in the embodiment of the present invention) are mixed with lactose at a weight ratio of 1:5, the premixing time is set to 5 minutes, and wet processing is used (humidity 0.1%).

[0072] 2. Add in batches: Add the premix in three batches, stirring for 3 minutes after each addition.

[0073] 3. Overall mixing: After the addition is completed, use a double-screw mixer to mix the entire thing for 10 minutes.

[0074] Implementation effect:

[0075] The measurement by laser particle size analyzer shows that the uniformity of the distribution of micronutrients in the milk powder is improved by 30% compared with the existing one-time mixing solution (Comparative Example 1), and the deviation rate of the micronutrient distribution is 1.5%.

[0076] Example 2

[0077] Standard formula;

[0078] Material composition, in terms of the proportion of milk powder by weight: same as in Example 1.

[0079] Preparation steps:

[0080] 1. Premixing: Vitamin A, calcium phosphate and ferrous sulfate (all three are micronutrients, corresponding to the nutrient powder in the embodiment of the present invention) are premixed with lactose in a weight ratio of 1:4.5, the premixing time is set to 5 minutes, and wet treatment is used (humidity 0.1%); other steps are the same as in Example 1.

[0081] Implementation effect:

[0082] The measurement by laser particle size analyzer shows that the uniformity of the distribution of micronutrients in the milk powder is improved by 29% compared with the existing one-time mixing solution (Comparative Example 1), and the deviation rate of the micronutrient distribution is 1.45%.

[0083] Example 3

[0084] Standard formula;

[0085] Material composition, in terms of the proportion of milk powder by weight: same as in Example 1.

[0086] Preparation steps:

[0087] 1. Premixing: Vitamin A, calcium phosphate and ferrous sulfate (all three are micronutrients, corresponding to the nutrient powder in the embodiment of the present invention) are premixed with lactose at a weight ratio of 1:5.5, the premixing time is set to 5 minutes, and wet treatment is used (humidity 0.1%); other steps are the same as in Example 1.

[0088] Implementation effect:

[0089] The laser particle size analyzer was used to measure the uniformity of the distribution of micronutrients in the milk powder, which was 33% higher than that of the existing one-time mixing solution (Comparative Example 1), and the deviation rate of the micronutrient distribution was 1.45%.

[0090] Example 4

[0091] High fiber milk powder

[0092] Material composition, in proportion to the weight of milk powder:

[0093] Whole milk powder: 50%;

[0094] Soluble dietary fiber (inulin): 15%;

[0095] Zinc: 0.1%;

[0096] Lactose: 34.9%;

[0097] Preparation steps:

[0098] 1. Premixing: Inulin and zinc (both are micronutrients, corresponding to the nutrient powder in the embodiment of the present invention) are premixed with lactose at a weight ratio of 1:5, and premixed for 8 minutes using a low-speed stirrer, with a wet processing humidity of 0.2%.

[0099] 2. Add in batches: Add the premix in five times, stirring for 2 minutes at intervals to ensure uniformity each time.

[0100] 3. Overall mixing: Perform final mixing at 8°C for 10 minutes.

[0101] Implementation effect:

[0102] Using a laser particle size analyzer, the uniformity of dietary fiber distribution increased by 25%, the zinc absorption rate increased by 15%, and the micronutrient distribution deviation rate was 1.43%.

[0103] Embodiment 5:

[0104] Functional milk powder (containing probiotics)

[0105] Material composition, in proportion to the weight of milk powder:

[0106] Milk powder: 60%

[0107] Probiotics (Bifidobacterium): 3%

[0108] Vitamin C: 0.1%

[0109] Lactose: 36.9%

[0110] Preparation steps:

[0111] 1. Premixing: Premix the probiotics with vitamin C (both are micronutrients, corresponding to the nutrient powder in the embodiment of the present invention) and lactose in a weight ratio of 1:5, and stir at low temperature (5° C.) for 5 minutes to prevent the live bacteria from being affected by heat.

[0112] 2. Add in batches: Add the premix to the base material three times, stirring for 3 minutes each time.

[0113] 3. Overall mixing: After completing the batches, mix in a double-screw mixer for 12 minutes.

[0114] Implementation effect:

[0115] The activity of probiotics increased by 20%, and the number of viable bacteria in the product reached 109 CFU / g. The deviation rate of micronutrient distribution was 1.43% when measured by laser particle size analyzer.

[0116] Comparative Example 1

[0117] Existing one-shot mixing methods

[0118] Material composition: Same as Example 1.

[0119] Preparation steps:

[0120] Add all ingredients to the base at once and mix for 15 minutes using conventional mixing equipment.

[0121] Implementation effect:

[0122] Using a laser particle size analyzer to measure, the deviation rate of micronutrient distribution is as high as over 5%, and the product quality is unstable.

[0123] Comparative Example 2

[0124] Batch method without premixing

[0125] Material composition: Same as Example 4.

[0126] Preparation steps:

[0127] The components are added directly to the base in batches without premixing.

[0128] Implementation effect:

[0129] The uniformity of dietary fiber distribution is poor, the deviation rate of micronutrient distribution is 4%, the product quality is unstable, and the product taste is poor.

[0130] Comparative Example 3

[0131] Wet process without batch addition

[0132] Material composition: Same as Example 5.

[0133] Preparation steps:

[0134] After all components are mixed, stir the whole and directly use the wet process.

[0135] Implementation effect:

[0136] The probiotic activity decreased by 10%, the uniformity of micronutrient distribution was poor, and the micronutrient distribution deviation rate was 3%.

[0137] The embodiment of the present invention provides a milk powder, which is prepared by any of the milk powder preparation methods described in the embodiment of the present invention. The nutrient powder in the milk powder of the embodiment of the present invention is evenly distributed, thereby improving the user experience.

[0138] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A method for preparing milk powder, characterized in that: include: Step S1: premixing the nutrient powder with the first part of the milk powder base material according to a weight ratio of the nutrient powder to the first part of the milk powder base material of (1:4.5)-(1:5.5), and stirring them evenly to obtain a premixed material package; Step S2: split the premixed material package into multiple sub-material packages, and add the sub-material packages to the second part of the milk powder base in batches until all the sub-material packages are added to the milk powder base to obtain milk powder; wherein each batch of the sub-material packages added to the milk powder base is stirred evenly.

2. The method for preparing milk powder according to claim 1, characterized in that: The weight ratio M of a single sub-material package to the second part of the milk powder base material satisfies: M≤0.

1.

3. The method for preparing milk powder according to claim 1, characterized in that: The milk powder base includes milk powder and lactose; Step S1 includes: The nutrient powder and lactose are premixed according to a weight ratio of nutrient powder to lactose of (1:4.5)-(1:5.5) to obtain the premix package.

4. The method for preparing milk powder according to claim 1, characterized in that: Premix the nutrient powder with the milk powder base in the first part and stir well, including: Add a variety of nutrient powders to the first part of the milk powder base in batches in order from small to large particle size, until all the nutrient powders are added to the first part of the milk powder base; wherein each batch of nutrient powders is stirred evenly after being added to the base.

5. The method for preparing milk powder according to claim 1, characterized in that: In the process of premixing the nutrient powder with the first part of the milk powder base and stirring them uniformly, wet spraying is performed on the premixed powder of the nutrient powder and the milk powder base.

6. The method for preparing milk powder according to claim 1, characterized in that: Step S2 then includes: Step S3: mixing the milk powder.

7. The method for preparing milk powder according to claim 6, characterized in that: The milk powder is mixed by using a double-screw mixer and / or a horizontal mixer.

8. The method for preparing milk powder according to claim 1, characterized in that: The nutrient powder includes at least one powder of vitamin A, vitamin D, vitamin E, vitamin C, B vitamins, lutein, calcium, iron, copper, magnesium, zinc, soluble dietary fiber, and probiotics.

9. The method for preparing milk powder according to claim 1, characterized in that: Milk powder base includes milk powder; The milk powder base also includes at least one of lactose, solid corn syrup, glucose, whey powder, white sugar, maltose and sugar alcohol.

10. A milk powder, characterized in that: The method for preparing the milk powder is described in any one of claims 1 to 9.

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