Method for determining standard range of mixing uniformity

Abstract

The invention discloses a method for determining a mixing uniformity standard range, which comprises the following steps of: firstly, selecting a certain key index of a product as an inspection index, and determining a standard upper limit Xmax and a standard lower limit Xmin of the inspection index according to a product quality standard; then calculating a center line # imgabs0 # of the quality standard to enable the product to reach a six-sigma level, and according to the six-sigma principle, obtaining that mu + 6 sigma is less than or equal to Xmax or mu-6 sigma is greater than or equal to Xmin; and finally, deducing according to the formula: # imgabs1 # or # imgabs2 # imgabs3 #. The invention innovatively proposes that the control requirements of six sigma and the control requirements of RSD are associated to deduce the control range of RSD, and provides an objective and accurate dry method mixing uniformity evaluation method, thereby laying a good foundation for product quality control of dry method mixing.

Description

Technical Field

[0001] The invention relates to the technical field of food processing and production, and more particularly to a method for determining a standard range of mixing uniformity. Background Art

[0002] In the food production and processing industry, the dry mixing process is widely used due to its advantages of simple process and flexible production scale. However, although the dry mixing process has simple process steps, it is a big problem to determine whether the mixture is mixed evenly after mixing.

[0003] The parameter currently widely used to judge the degree of mixing uniformity is mixing uniformity. Mixing uniformity refers to the uniformity of the mixed material, expressed by RSD (relative standard deviation), and the calculation formula is: Where σ is the standard deviation and μ is the arithmetic mean. The smaller the RSD, the more uniform the powder mixing, and vice versa. However, there are currently no relevant laws, regulations, or industry standards that clearly require the RSD control range of food dry mixing processes, so it is difficult to judge the quality of the product.

[0004] Therefore, how to provide an objective and accurate method for determining the standard range of mixing uniformity is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a method for determining a standard range of mixing uniformity, which lays a good foundation for quality control of dry mixed products.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A method for determining a standard range of mixing uniformity comprises the following steps:

[0008] Step 1: Select a key indicator of the product as the evaluation indicator, and determine the upper limit of the evaluation indicator as X according to the product quality standard. max , the standard lower limit is X min ;

[0009] Step 2: Calculate the center line of the quality standard

[0010] Step 3: Make the product reach the Six Sigma level. According to the Six Sigma principle, μ+6σ≤X max or μ-6σ≥X min ;

[0011] Step 4: Based on the formula of step 2-step 3, we can get:

[0012] or

[0013] Preferably, the specific derivation process in step 4 is:

[0014] (1)μ+6σ≤X max ,but because Therefore, it can be concluded Right now in therefore,

[0015] (2)μ-6σ≥X min ,but because Therefore, it can be concluded Right now in therefore,

[0016] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a method for determining a standard range of mixing uniformity, which has the following beneficial effects:

[0017] The present invention innovatively proposes to link the control requirements of Six Sigma with the control requirements of RSD, and then derives the control range of RSD, providing an objective and accurate dry mixing uniformity evaluation method, thereby laying a solid foundation for dry mixing product quality control. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0019] The method for determining the standard range of mixing uniformity provided by the present invention, wherein the basic assumption is: the so-called mixing uniformity means that the test results of sampling and testing at any position in a batch of products meet the requirements of product quality standards. Principle: Based on the Six Sigma principle and the quality standards of the products, the qualified standard range of mixing uniformity is derived and calculated. Specifically, the following steps are included:

[0020] Step 1: Select a key indicator of the product as the evaluation indicator, and determine the upper limit of the evaluation indicator as X according to the product quality standard. max , the standard lower limit is X min ;

[0021] Step 2: Calculate the center line of the quality standard

[0022] Step 3: According to the Six Sigma principle, when the Six Sigma level is reached, the product failure rate is only 0.00034%. This level is usually used as a sign of high stability of product quality and is the goal of a product to pursue high stability. In order to make the product reach the Six Sigma level, according to the Six Sigma principle, it can be known that μ+6σ≤X max or μ-6σ≥X min ;

[0023] Step 4: Based on the formula of step 2-step 3, we can get:

[0024] μ+6σ≤X max , divide both sides of the inequality by μ, then because Therefore, it can be concluded After moving the terms, dividing both sides of the inequality by 6, we can get: in therefore,

[0025] Or μ-6σ≥X min , divide both sides of the inequality by μ, then because Therefore, it can be concluded After moving the terms, dividing both sides of the inequality by 6, we can get: in therefore,

[0026] In the above conclusion formula, X max is a known item, i.e., the upper limit of the product standard, X min is a known item, i.e., the lower limit of the product standard. Therefore, the qualified standard range of the mixing uniformity RSD of a certain indicator can be calculated according to the product quality standard.

[0027] The scheme of the present invention will be further described below using specific embodiments.

[0028] Example 1

[0029] A commercially available dry mixed solid beverage product is selected, with a mass percentage of 100%, including 50% soy protein, 48.4% maltodextrin, 0.8% calcium carbonate, 0.6% magnesium carbonate, 0.1% ferric pyrophosphate, and 0.1% zinc gluconate. Taking the mixing uniformity calculation of nutritionally fortified iron as an example, the product quality standard requires the iron content range to be 9.6-22.0 mg / 100 g, that is:

[0030] X min =9.6mg / 100g, X max =22.0mg / 100g;

[0031] according to It can be calculated that RSD≤6.5%; similarly, according to It can also be calculated that RSD ≤ 6.5%.

[0032] The iron content of all finished products of this product was inspected before leaving the factory within one year, for a total of 12 batches, and the results were 15.5mg / 100g, 16.2mg / 100g, 15.4mg / 100g, 16.1mg / 100g, 15.5mg / 100g, 15.9mg / 100g, 16.8mg / 100g, 16.7mg / 100g, 15.4mg / 100g, 15.7mg / 100g, 14.8 mg / 100g, 15.9mg / 100g, the above 12 batches of results all meet the quality standard requirements. According to the detection results of iron in these 12 batches of products, RSD=3.6% can be calculated (Note: μ=15.8mg / 100g, σ=0.57mg / 100g), which is less than the theoretically calculated 6.5%, indicating that the products are evenly mixed, and the unqualified rate of iron content in the products does not exceed 0.00034%, which has reached the Six Sigma level.

[0033] The various embodiments are described in a progressive manner in this specification, and the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A method for determining a standard range of mixing uniformity, characterized in that: The following steps are involved: Step 1: Select a key indicator of the product as the evaluation indicator, and determine the upper limit of the evaluation indicator as X according to the product quality standard. max , the standard lower limit is X min ; Step 2: Calculate the center line of the quality standard Step 3: Make the product reach the Six Sigma level. According to the Six Sigma principle, μ+6σ≤X max or μ-6σ≥X min ; Step 4: Based on the formula of step 2-step 3, we can get: or 2. A method for determining a standard range of mixing uniformity according to claim 1, characterized in that: The specific derivation process in step 4 is: (1)μ+6σ≤X max ,but because So we can conclude that 1+ Right now in therefore, (2)μ-6σ≥X min ,but because Therefore, it can be concluded Right now in therefore,

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