Preparation method of milk powder and milk powder

Abstract

The invention provides a milk powder preparation method and milk powder, and the preparation method comprises the following steps: S1, drying a pre-prepared emulsion to obtain a milk powder base material; s2, nutrient powder is added into the milk powder base material and stirred to be uniform, the milk powder is obtained, and the content of powder with the particle size being 45-55 micrometers in the milk powder is controlled to account for 45% or above of the total powder by volume ratio. In the embodiment of the invention, the content of the powder with the particle size of 45-55 microns in the milk powder is controlled to account for 45% or more of the total powder in volume ratio in the step S2, so that scattering of the milk powder during subpackaging can be effectively inhibited, and the packaging success rate and efficiency are improved.

Description

Technical Field

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

[0002] During the packaging process of milk powder, the milk powder needs to be filled into the packaging bag through the opening of the packaging bag, and then the opening of the packaging bag is sealed by heat pressure.

[0003] However, in actual applications, during the process of milk powder being filled into the packaging bag from the opening of the packaging bag, the milk powder will be scattered, that is, the powder particles of the milk powder will fly in the air. Especially when the milk powder is packaged into small-volume packages, such as 25g-level strip packaging bags, the packaging line has a fast packaging speed and the hot-pressing sealing surface of the packaging bag opening is small (for example, the milk powder scattered when the milk powder is filled into the current packaging, or the milk powder particles scattered by the previous packaging will not have time to settle and are easy to adhere to the packaging bag opening of the current packaging due to the fast packaging speed of the packaging line), which may easily cause the milk powder to be mixed in the hot-pressing sealing surface of the packaging bag opening after hot-pressing sealing, and the hot-pressing sealing does not meet the sealing requirements, resulting in a low packaging success rate. Summary of the invention

[0004] The embodiment of the present invention provides a milk powder preparation method and milk powder, so as to solve the problem that the milk powder prepared by the existing milk powder preparation method is easy to cause milk powder powder to be mixed in the hot pressing sealing surface during packaging, the hot pressing sealing does not meet the sealing requirements, and the packaging success rate is low.

[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: drying the pre-formulated emulsion to obtain a milk powder base;

[0008] Step S2: adding nutrient powder to the milk powder base and stirring evenly to obtain milk powder, wherein the content of powder with a particle size of 45-55 microns in the milk powder is controlled to account for more than 45% of the total powder by volume.

[0009] Optionally, the nutrient powder comprises tricalcium phosphate.

[0010] Optionally, the weight of the tricalcium phosphate is 0.5-1.5‰ of the weight of the milk powder base.

[0011] 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.

[0012] Optionally, the raw materials of the pre-formulated emulsion include: cow's milk;

[0013] The raw materials of the pre-configured emulsion also include at least one of desalted whey powder, solid corn syrup, lactose, glucose, white sugar, maltose, and sugar alcohol.

[0014] Optionally, step S1 includes:

[0015] The particle size of the milk powder base material is controlled by a spray drying process so that the average particle size D of the powder in the milk powder base material is 10 is 55-75 microns, and the average particle size D of the powder in the milk powder base 4,3 150-170 microns.

[0016] Optionally, the step of adding nutrient powder to the milk powder base and stirring evenly to obtain milk powder comprises:

[0017] The milk powder base material and the nutrient powder material are sequentially added into a dry mixer for dry mixing to obtain the milk powder.

[0018] Optionally, the rotation speed of the dry mixer is 20-22 rpm / min, and the processing time of the dry mixing process is 2-5 min.

[0019] Optionally, step S2 includes:

[0020] Step S3: packing the milk powder into strip packages.

[0021] In a second aspect, an embodiment of the present invention provides a milk powder prepared by the milk powder preparation method as described in any one of the first aspects.

[0022] In the embodiment of the present invention, by controlling the content of powder with a particle size of 45-55 μm in the milk powder to account for more than 45% of the total powder by volume in step S2, the scattering of milk powder during packaging can be effectively suppressed, thereby improving the packaging success rate and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] 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

[0025] The following will be combined with the accompanying drawings in 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.

[0026] The terms "first", "second", etc. in the embodiments of the present invention 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 invention can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "or" in the embodiments of the present invention 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.

[0027] In the technical solutions of the embodiments of the present invention, words such as “connect”, “couple” or “connected” are not limited to physical or mechanical connections, but may include electrical connections.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] It should be noted that the raw materials used in the embodiments of the present invention can be obtained commercially, and any range recorded in the embodiments of the present invention includes the end values ​​and any numerical values ​​between the end values ​​and any sub-range formed by the end values ​​or any numerical values ​​between the end values.

[0030] 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:

[0031] Step S1: drying the pre-formulated emulsion to obtain a milk powder base;

[0032] Step S2: adding nutrient powder to the milk powder base and stirring evenly to obtain milk powder, wherein the content of powder with a particle size of 45-55 microns in the milk powder is controlled to account for more than 45% of the total powder by volume.

[0033] In the embodiment of the present invention, by controlling the content of powder with a particle size of 45-55 microns in the milk powder to account for more than 45% of the total powder by volume in step S2, the scattering of milk powder during subpackaging can be effectively suppressed, and the packaging success rate and efficiency can be improved. In particular, for 25g-level strip packaging bags, two hot-pressing horizontal seals (in the width direction of the packaging bag) and hot-pressing vertical seals (in the length direction of the packaging bag) are required when the strip packaging bags are closed. During hot pressing, they are easily affected by the scattering of milk powder, resulting in sealing failure and reducing the packaging success rate and efficiency. In the embodiment of the present invention, by controlling the content of powder with a particle size of 45-55 microns in the milk powder to account for more than 45% of the total powder by volume in step S2, the scattering of milk powder during subpackaging can be effectively suppressed, and the packaging success rate and efficiency of milk powder in strip packaging bags can be improved.

[0034] In some embodiments of the present invention, optionally, the nutrient powder includes tricalcium phosphate.

[0035] Tricalcium phosphate (chemical formula: Ca3(PO4)2) is an inorganic compound. In milk powder, tricalcium phosphate can be used as a calcium source to effectively supplement the calcium required by infants and children and promote the development of bones and teeth. Calcium is an essential mineral for maintaining normal physiological functions and is crucial for the growth and health of bones. In milk powder, tricalcium phosphate can also be used as a phosphorus source, participating in energy metabolism, cell structure and bone health, and helping to maintain the body's acid-base balance and cell function. Adding tricalcium phosphate to milk powder can also help achieve the appropriate ratio of calcium to phosphorus, which is very important for the growth and development of infants. The appropriate calcium-phosphorus ratio contributes to the healthy development of bones. Tricalcium phosphate in milk powder also helps to improve the stability of the product and prevents stratification or precipitation of ingredients. Tricalcium phosphate in milk powder can also improve the texture and taste of the product, making it easier to dissolve and eat.

[0036] In some embodiments of the present invention, optionally, the weight of the tricalcium phosphate is 0.5-1.5‰ of the weight of the milk powder base, and preferably, the weight of the tricalcium phosphate is 1‰ of the weight of the milk powder base. The weight of the tricalcium phosphate is 0.5-1.5‰ of the weight of the milk powder base, which is beneficial to both improving the nutrition of the milk powder and reducing the dispersion of the milk powder, and improving the success rate and efficiency of packaging the milk powder.

[0037] 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.

[0038] In some embodiments of the present invention, optionally, the raw materials of the pre-formulated emulsion include: cow's milk;

[0039] The raw materials of the pre-configured emulsion also include at least one of desalted whey powder, solid corn syrup, lactose, glucose, white sugar, maltose, and sugar alcohol. The raw materials of the pre-configured emulsion are conducive to improving the flavor and taste of the milk powder and ensuring high nutrition.

[0040] In some embodiments of the present invention, optionally, step S1 includes:

[0041] The particle size of the milk powder base material is controlled by a spray drying process so that the average particle size D of the powder in the milk powder base material is 10 is 55-75 microns, and the average particle size D of the powder in the milk powder base 4,3 150-170 microns.

[0042] In some embodiments of the present invention, optionally, the step of adding nutrient powder to the milk powder base and stirring evenly to obtain milk powder comprises:

[0043] The milk powder base material and the nutrient powder material are sequentially added into a dry mixer for dry mixing to obtain the milk powder. The dry mixing process can improve the uniformity of the mixing of the nutrient powder material and the milk powder base material and improve the quality of the milk powder.

[0044] In some embodiments of the present invention, the rotation speed of the dry mixer is 20-22 rpm / min, and the processing time of the dry mixing process is 2-5 min. By coordinating the rotation speed and processing time, the uniformity of mixing the nutrient powder and the milk powder base can be improved, thereby improving the quality of the milk powder.

[0045] In some embodiments of the present invention, optionally, step S2 includes:

[0046] Step S3: packing the milk powder into strip packages.

[0047] In some embodiments of the present invention, a strip packaging machine is optionally used to implement milk powder packaging, which has high packaging efficiency. In addition, the strip-packaged milk powder has excellent portability, which is convenient for users to brew.

[0048] The present invention is described below in conjunction with specific embodiments.

[0049] Example 1

[0050] The milk powder preparation process includes:

[0051] Spraying an emulsion prepared with desalted whey powder, solid corn syrup, lactose and glucose into a drying tower for drying to obtain a milk powder base;

[0052] Add tricalcium phosphate in an amount of 1‰ of the weight of the milk powder base to the milk powder base and stir evenly, wherein an MS-3000 Malvern particle size detector is used to control the adding and stirring processes, and the content of powder with a particle size of 45-55 microns in the milk powder is controlled to account for 45% of the total powder by volume.

[0053] Example 2

[0054] During the preparation of the milk powder, the content of powder with a particle size of 45-55 μm in the milk powder is controlled to account for 60% of the total powder by volume, and the other steps are the same as those in Example 1.

[0055] Example 3

[0056] During the preparation of the milk powder, the content of powder with a particle size of 45-55 μm in the milk powder is controlled to account for 70% of the total powder by volume, and the other steps are the same as those in Example 1.

[0057] Example 4

[0058] During the preparation of milk powder, tricalcium phosphate in an amount of 0.5‰ of the weight of the milk powder base is added to the milk powder base and stirred evenly. The other steps are the same as those in Example 1.

[0059] Example 5

[0060] During the preparation of milk powder, tricalcium phosphate in an amount of 1.5‰ by weight of the milk powder base is added to the milk powder base and stirred evenly. The other steps are the same as those in Example 1.

[0061] Comparative Example 1

[0062] During the preparation of the milk powder, the content of powder with a particle size of 45-55 μm in the milk powder is controlled to account for 40% of the total powder by volume, and the other steps are the same as those in Example 1.

[0063] Comparative Example 2

[0064] During the preparation of the milk powder, the content of powder with a particle size of 45-55 μm in the milk powder is controlled to account for 30% of the total powder by volume, and the other steps are the same as those in Example 1.

[0065] Comparative Example 3

[0066] During the preparation of milk powder, tricalcium phosphate in an amount of 0.4‰ of the weight of the milk powder base is added to the milk powder base and stirred evenly. The other steps are the same as in Example 1.

[0067] Comparative Example 4

[0068] During the preparation of milk powder, tricalcium phosphate in an amount of 1.6‰ of the weight of the milk powder base is added to the milk powder base and stirred evenly. The other steps are the same as in Example 1.

[0069] The milk powders prepared in Examples 1-5 and Comparative Examples 1-4 were packaged using a 25 g strip packaging machine, and the packaging effects were evaluated. The evaluation results are shown in Table 1.

[0070] Evaluation method:

[0071] The 25g strip test packaging machine used is a laboratory test equipment (not a high-power equipment for production lines). The rated packaging capacity of the packaging machine is 20kg / hour, and the packaging machine runs for 30 minutes. Every 5 minutes, a sample of the finished packaged product (hereinafter referred to as sample) is taken from the finished package outlet of the packaging machine for testing.

[0072] Success rate = number of qualified samples ÷ total number of samples. The assessment of whether or not a sample is qualified includes both subjective and objective assessments.

[0073] First, we will conduct a subjective assessment, and organize 5 evaluators to independently assess the appearance and packaging image of each sample. Then, the 5 evaluators will discuss and determine whether the subjective assessment is qualified. If the subjective assessment is unqualified, the sample will be determined to be unqualified.

[0074] If the subjective assessment is qualified, an objective assessment will be conducted. In the objective assessment, for each sample's transverse seal, measure the width of the transverse seal at 5 measurement positions spaced along the length of the transverse seal, and take the average value to obtain the actual measured value of the transverse seal width. For each sample's longitudinal seal, measure the width of the longitudinal seal at 5 measurement positions spaced along the length of the longitudinal seal, and take the average value to obtain the actual measured value of the longitudinal seal width. Compare the measured transverse seal width with the standard transverse seal width value of a 25g strip package (determined according to national and enterprise standards), and compare the measured longitudinal seal width with the standard longitudinal seal width value of a 25g strip package (determined according to national and enterprise standards). When the measured transverse seal width ≥ the standard transverse seal width value and the measured longitudinal seal width ≥ the standard longitudinal seal width value, the sample is determined to be qualified. In other cases, the samples are considered unqualified.

[0075] After the packaging machine has been running for 30 minutes, measure the total weight of the milk powder packed by the packaging machine within 30 minutes (called the measured weight). Efficiency = measured weight ÷ rated weight of the packaging machine (that is, rated packaging capacity 20kg / hour × 0.5 hours).

[0076] Table 1 Packaging effect evaluation

[0077]

[0078] It can be seen from Table 1 that the packaging effects of Examples 1-5 are significantly better than those of Comparative Examples 1-4, and the embodiments of the present invention improve the packaging success rate and efficiency of milk powder in strip packaging bags.

[0079] The embodiment of the present invention provides a milk powder, which is prepared by any of the milk powder preparation methods implemented by the present invention. The milk powder prepared by the preparation method of the embodiment of the present invention is added with nutrient powder, has high nutrition, and can be packaged with a high success rate. The final product after packaging has high quality and good user experience.

[0080] 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: drying the pre-formulated emulsion to obtain a milk powder base; Step S2: adding nutrient powder to the milk powder base and stirring evenly to obtain milk powder, wherein the content of powder with a particle size of 45-55 microns in the milk powder is controlled to account for more than 45% of the total powder by volume.

2. The method for preparing milk powder according to claim 1, characterized in that: The nutrient powder includes tricalcium phosphate.

3. The method for preparing milk powder according to claim 2, characterized in that: The weight of the tricalcium phosphate is 0.5-1.5‰ of the weight of the milk powder base.

4. The method for preparing milk powder according to any one of claims 1 to 3, 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.

5. The method for preparing milk powder according to claim 1, characterized in that: The raw materials of the pre-formulated emulsion include: cow's milk; The raw materials of the pre-configured emulsion also include at least one of desalted whey powder, solid corn syrup, lactose, glucose, white sugar, maltose, and sugar alcohol.

6. The method for preparing milk powder according to claim 1, characterized in that: Step S1 includes: The particle size of the milk powder base material is controlled by a spray drying process so that the average particle size D of the powder in the milk powder base material is 10 is 55-75 microns, and the average particle size D of the powder in the milk powder base 4,3 150-170 microns.

7. The method for preparing milk powder according to claim 1, characterized in that: The step of adding nutrient powder to the milk powder base and stirring evenly to obtain milk powder comprises: The milk powder base material and the nutrient powder material are sequentially added into a dry mixer for dry mixing to obtain the milk powder.

8. The method for preparing milk powder according to claim 7, characterized in that: The rotation speed of the dry mixer is 20-22 rpm / min, and the processing time of the dry mixing process is 2-5 min.

9. The method for preparing milk powder according to claim 1, characterized in that: Step S2 then includes: Step S3: packing the milk powder into strip packages.

10. A milk powder, characterized in that: The milk powder is prepared by the milk powder preparation method according to any one of claims 1 to 9.

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