JJF 1070-2023Rules of Metrological Testing for Net Quantity of Products in Prepackages with Fixed Content (English PDF)

3.1 Terminology

3.1.1 Products in prepackages

The individual goods whose, before sale, contents are pre-packaged with packaging materials or packaging containers, AND which have a predetermined value or quantity (marked with net quantity).

4.1 General

At the packaging, import, distribution, wholesale transaction sites and sales links of products in prepackages with fixed content (such as the production or public sales sites of products in prepackages with fixed content), the nominal quantity and net quantity of products in prepackages with fixed content shall comply with the metrological requirements of 4.2 and 4.3.

4.2 Requirements for net quantity marking

4.2.1 Marking of single items

4.2.1.1 The net quantity of the product shall be marked on the principal display panel of the packaging of products in prepackages with fixed content or in a prominent position on the product label.

The marking of net quantity shall be correct, clear and easy to understand. It shall not cause consumers to misunderstand the net quantity of the product.

Note: The product marking referred to in this Specification does not involve health, safety, production date, shelf life, storage conditions, nutritional ingredients, etc.

4.2.1.2 Composition of net quantity marking

The net quantity marking consists of three parts: "net quantity" (Chinese), numbers, legal measurement units (or counting units expressed in Chinese), such as "net quantity:

500 grams".

Note: The counting unit expressed in Chinese refers to the non-physical quantity unit expressed in Chinese characters.

For the products in prepackages with fixed content whose net quantity is marked in terms of length, area, counting units, they can be exempted from the need to mark the three Chinese characters "net quantity", but only mark the figure of the net quantity and the legal unit of measurement (or the counting unit expressed in Chinese). For example,

"50 meters", "10 square meters", "100 pieces".

The numerical part in the net quantity marking shall usually not exceed 3 significant figures. For example, it shall be marked as "net quantity: 5.55 kg" instead of "net quantity: 5.555 kg".

If the net quantity marked on the product packaging includes a free (gift) amount, any

5.1 General

5.1.1 Sampling and metrological inspection methods

Metrological supervisory inspection on the net quantity of products in prepackages with fixed content shall be carried out in strict accordance with the requirements and procedures of this Specification.

If the metrological inspection of net quantity is carried out by sampling method, sampling shall be carried out in accordance with the sampling method specified in

Appendix A of this Specification, at the production and packaging sites, import, distribution, wholesale transactions, sales links of products in prepackages with fixed content.

Metrological inspection shall be carried out on various types of products with different labeling methods, in accordance with the inspection methods specified in Appendix B,

Appendix F to Appendix K of this Specification. For products in prepackages with fixed content where there is no metrological inspection methods in this Specification, it shall be implemented in accordance with corresponding international standards, national standards or other methods prescribed by the State Administration for Market

Regulation.

When the above requirements of this Article are met, the inspection agency shall choose non-destructive inspection methods for metrological inspection as much as possible, to reduce unnecessary waste.

5.1.2 Homogeneity of products and samples

Sampling an inspection batch shall ensure that all products in prepackages with fixed content in the inspection batch have equal sampling probability.

If sampling is done at the production or packaging site, the inspection batch shall be all products in prepackages with fixed content on the production line, that have not been rejected by the inspection system. The samples taken must be self-inspection qualified products after packaging inspection in the final packaging process.

During the sampling process, in addition to normal operating adjustments or correction measures for the production line, abnormal operating adjustments or corrections to the filling or inspection process of the production line shall be prohibited.

5.1.3 Measurement uncertainty

The expanded uncertainty of measuring instruments and metrological inspection methods, which are related to determining the actual quantity inspection results of products in prepackages with fixed content, shall not exceed 0.2T (k = 2).

Factors that affect the uncertainty of metrological inspection results include the maximum allowable error and repeatability of the measuring instrument, changes in packaging materials, density fluctuations caused by differences in the amount of solids in the liquid or temperature changes, etc.

5.1.4 Net quantity inspection of inspection batches

5.1.4.1 Regardless of whether the sampling inspection method is used to determine the compliance of the inspection batch, each metrological testing of the net quantity of the product shall include the following three parameters:

a) The average actual quantity of products in prepackages with fixed content in the inspection batch;

b) The number of T 1 inadequate prepackages among the products in prepackages with fixed content in the inspection batch;

c) Whether the inspection batch of products in prepackages with fixed content has

T2 inadequate prepackages.

Note: For inspection batches sampled in the retailer's warehouse and retail site (5.2.1c), and the batch size is within 10 pieces, there is no requirement for the average actual quantity.

5.1.4.2 Impact of other factors on net quantity

When carrying out metrological inspection on the net quantity of products in prepackages with fixed content, reasonable changes in the net quantity of products that may be caused by environmental conditions, such as storage and transportation, shall be fully considered.

Usually products in prepackages with fixed content are stored and transported under ambient conditions of normal temperature and humidity. Such an environment may cause the actual quantity of the packaged goods to change. Therefore, when evaluating the average actual quantity of the goods and the actual quantity of a single product, for products whose net quantity changes greatly due to factors such as changes in the moisture content of the product, such as soap, wheat flour, rice and other products, manufacturer shall take measures to ensure the accuracy of the net quantity of the product under specified conditions. In principle, the market supervision department's metrological supervisory inspection of such products in prepackages with fixed content shall be carried out at the production site, OR the metrological inspection shall be carried out using the special methods specified in the series of specifications for the measurement and inspection of the net quantity of products in prepackages with fixed content.

batch size shall be equal to the maximum hourly output the production line or

100000, whichever is smaller. If the hourly production output of the manufacturer cannot be confirmed, refer to c).

c) Retailer's warehouse and retail site sampling

When sampling at the retailer's warehouse or retail site, the inspection batch size is determined by the sampling personnel. Usually, the inspection batch size is defined as all the same products in prepackages with fixed content that are available on-site at the sampling location, but cannot exceed 100000 pieces. At this time, it can be considered that the products in prepackages with fixed content in this inspection batch are of the same quality.

Note: If the corresponding international standards, national standards or other specifications in the JJF1070 series of Specifications have special requirements for inspection batches, the inspection batches shall be determined according to their provisions.

5.2.2 Measurement requirements for inspection batches

5.2.2.1 Requirements for average actual quantity

For each inspection batch, the average actual quantity of products in prepackages with fixed content shall be greater than or equal to its nominal quantity.

If an inspection lot meets the requirements of this Article, the probability that the inspection lot is mistakenly rejected (erroneously assessed as unqualified) will not exceed 0.5%. If the average actual quantity of the inspection lot is less than (Qn - 0.74sigma), the probability that it is correctly rejected (correctly assessed as unqualified) is at least

90%.

If the average actual quantity of samples of an inspection batch is less than its nominal quantity minus its correction value [see formula (1)], then the inspection batch shall be assessed as unqualified.

5.2.2.2 Requirements on the actual quantity of a single product

The actual quantity of a single product in prepackages with fixed content shall accurately reflect its nominal quantity. If there is an inadequate of the actual quantity of a single product, the inadequate shall meet the requirements of 4.3.1.

a) Single piece of category T 1 inadequate prepackages

If the number of category T1 inadequate prepackages in an inspection batch is greater than the quantity specified in Table 4, then the inspection batch shall be assessed as unqualified.

The products used as inspection batches shall be products that have passed the manufacturer's self-inspection, or products in the sales field. Determine the batch size of the inspection batch according to the requirements of 5.3.

5.4.3 Search sampling plan

Search the sampling plan according to Table 4 according to the inspection batch size.

If the inspection batch size is not the typical value in Table 4, the sampling plan shall be retrieved according to Appendix Q, to determine the sample size and the indicators for evaluating the sample. When selecting the sampling plan in Appendix Q, pay attention that there shall not be any category T2 inadequate prepackages.

5.4.4 Take samples

Random sampling method shall be used to select samples from the inspection batch;

the sampled products shall meet the corresponding requirements of the single product.

The sampling method shall ensure that the possibility of each product being selected as a sample is as equal as possible. The sampling process shall be coordinated and confirmed by personnel from the party being sampled. See Appendix A for the specific random sampling method.

After sampling for metrological supervision and inspection, a sampling form for metrological supervisory inspection of products in prepackages with fixed content shall be filled in (see Appendix M for the format of the sampling form).

5.4.5 Metrological inspection of samples

5.4.5.1 Inspection of net quantity labeling

The net quantity labeling of products in prepackages with fixed content shall be inspected according to the requirements of 4.2. The inspection requirements and methods are shown in Table 1 and Table 2.

5.4.5.2 Metrological inspection of net quantity

According to the net quantity labeled on products in prepackages with fixed content and the characteristics of the goods, select the appropriate method from Appendix F to

Appendix K, to carry out encoding and meteorological inspection of the taken samples one by one; calculate the actual quantity, average actual quantity of the sample, the quantity of category T 1 inadequate prepackages and category T2 inadequate prepackages, etc.

See Appendix C for the method of removing tare mass.

The metrological inspection methods for products, whose net quantity is marked in mass (weight) units, are as shown in Appendix F;

The metrological inspection methods for products, whose net quantity is marked in volume units, are shown in Appendix G;

The metrological inspection methods for products, whose net quantity is marked in units of length, are as shown in Appendix H;

The metrological inspection methods for products, whose net quantity is marked in area units, are as shown in Appendix J;

The metrological inspection methods for products, whose net quantity is marked in counting units, are as shown in Appendix K.

5.5 Original records and data processing

5.5.1 Original records

The original record of each inspection shall contain sufficient information; the items listed in the record shall be filled in accurately. Observations, measurement data, calculations shall be recorded during the inspection. The record shall include the signatures of the person who performed the inspection and the person who reviewed the results. The records shall be kept for a specified period (see Appendix N for the original inspection record format).

5.5.2 Data processing

Relevant parameters, such as the actual quantity of a single product and the average actual quantity of the sample, shall be calculated in accordance with the requirements specified in Chapter 4.

6.1 Evaluation criteria

6.1.1 Labeling evaluation criteria

If the net quantity labeling of products in prepackages with fixed content occurs in any of the following situations, the labeling will be assessed as unqualified.

a) Failure to mark the net quantity of the product in a correct and clear manner in a prominent position on the product packaging;

b) The composition of the net quantity labeling does not meet the prescribed requirements;

c) The selection of measurement units and labeling categories does not meet the prescribed requirements;

d) The significance of the nominal quantity does not meet the prescribed requirements;

e) When the same packaged product contains multiple pieces of the same products in prepackages with fixed content, if the net quantity of the single products in prepackages with fixed content and the total number of single products are not marked, meanwhile the total net quantity of the products in prepackages with fixed content is not labeled;

f) When the same packaged product contains multiple different types of products in prepackages with fixed content, if the net quantity of a single piece of various different products in prepackages with fixed content and the number of pieces of various different products in prepackages with fixed content are not marked, meanwhile the total net quantity various different types of products in prepackages with fixed content is not labeled.

6.1.2 Assessment criteria for net quantity

6.1.2.1 Assessment basis

If there are provisions in the mandatory national standards for products in prepackages with fixed content regarding the labeling of the net quantity of products in prepackages with fixed content, the tolerable inadequate, the selection of legal units of measurement, those provisions shall prevail; if there are no provisions, this Specification shall apply.

6.1.2.2 Assessment criteria

If any of the following conditions occurs in an inspection batch, it will be assessed as a failed batch.

a) The average actual quantity of the sample is less than the nominal quantity minus the correction value F × s of the average actual quantity of the sample;

b) The number of items in category T1 inadequate prepackages exceeds the quantity specified in the fourth column of Table 4;

c) There is one or more category T2 inadequate prepackages.

6.2 Inspection report

Metrological inspection results shall be reported accurately, objectively, standardizedly;

the inspection reports shall be issued. The inspection report shall include sufficient information; the conclusions in the report shall be issued in accordance with the provisions of 6.1; the explanation shall be based on documentation. The overall

Appendix A

Random sampling method

Metrological testing of the net quantity of products in prepackages with fixed content shall be carried out by sampling method; random sampling shall be carried out according to the sampling location and batch size of the product inspection batch.

Random sampling is divided into three methods: equal interval sampling, stratified sampling, simple sampling. When sampling, personnel from the party being sampled shall be present to cooperate and confirm.

A.1 Equal interval sampling

Equal interval sampling is suitable for selecting qualified products, at the end of the production line of a manufacturing enterprise or at the product packaging site.

The sampling method is to take a sample at intervals of a certain number of units of goods or at intervals of a certain time, until the required sample size is reached. The sampling interval is equal to the batch size or the time required to produce a batch of product divided by the sample size.

A.2 Stratified sampling

Stratified sampling is suitable for sampling in manufacturing enterprises, wholesalers, warehouses of retail goods.

The sampling method is to assign the determined sample size n to each layer in proportion, to the number of unit products occupied by each layer, for the inspection batch of N pieces of goods stacked in k layers; nt pieces of unit samples shall be sampled from each layer; that is, n t = n/k, it shall be ensured that nt is an integer greater than 1, at least one sample shall be taken from each layer (i.e., n >= k). Then randomly select a given number of samples nt in each layer independently (usually simple sampling).

A.3 Simple random sampling

Simple random sampling, also called simple sampling, is suitable for sampling at product retail sites.

The sampling method is to randomly select n pieces of products from an inspection batch, which contains N pieces of products, as samples to be measured and inspected.

When sampling, the possibility of each unit product in the inspection batch being selected as a sample is equal.

The specific sampling method can be selected, in accordance with the national standard

GB/T 10111 "Generation of random numbers and procedures applied to sampling inspection for product quality" or the random number table method and other appropriate methods.

Chinese Standards

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