Metrological work of the most popular quantitative

2022-08-02
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In order to better implement the requirements of the state for the supervision and management of commodity volume, Hangzhou Municipal Bureau of Technical Supervision recently conducted a selective survey of 38 quantitatively packaged commodity production enterprises in Hangzhou, involving grain and oil, food, beverage, cosmetics, washing products, paint, coating, wires and cables, gas and other production enterprises closely related to the lives of the people, The contents of the investigation include the variety of production products, standards adopted, packaging methods, process control ability, finished product testing equipment, measuring instrument management, the establishment of quality assurance system or measurement and testing system by the enterprise, the quality of inspection and measurement personnel, etc., and spot check on the physical objects produced on site. According to the survey, the following problems mainly exist in the measurement work of some enterprises:

first, the enterprise has a weak legal awareness of measurement, and the basic work of measurement management is poor. Some enterprises only pay attention to production or marketing, but do not pay attention to measurement management. Measurement personnel have not received training in measurement laws and regulations, and no special person is responsible for measurement management; The accuracy of the selected measuring instruments can not meet the negative deviation requirements for the measurement of quantitatively packed commodities, the environmental conditions used can not meet the specified requirements, such as humidity, inclination, etc., the testing equipment is backward and the means are incomplete; Measuring instruments are not managed by specially assigned personnel and are not subject to periodic verification. Among them, 12 enterprises' measuring instruments are used beyond the verification cycle, accounting for 31.5% of the surveyed enterprises. The quantity value of some imported instruments cannot be traced to the source, and no effective calibration method has been adopted. The negative deviation of net content stipulated in some enterprise standards formulated before 1995 is inconsistent with the provisions on metrological supervision of quantitatively packed commodities

II. The quantitative packaging production equipment is backward. Although some joint ventures and state-owned enterprises have introduced better imported equipment and adopted modern full-automatic packaging, the accuracy of quantitatively packaged goods is ensured in terms of hardware. However, nearly half of the units are still at the level of manual packaging, accounting for 47.5% of the surveyed enterprises. The accuracy of packaging measurement is unstable and human factors are large. Some of the enterprises have outdated packaging equipment, backward technology and poor measurement repeatability

III. The net content of quantitatively packed commodities was not effectively controlled, and the pass rate of physical spot check was not ideal. First of all, there is no clear stipulation on the tare weight of the packaging. The glass bottles or iron drums processed by some units are not put into storage for acceptance, and the tare weight is estimated to remain unchanged for one year, so that the net content of the ex factory products is out of control, resulting in inaccurate and unstable product measurement. Second, the management is not in place. Some enterprises do not pay attention to the measurement of quantitatively packaged goods. It doesn't matter if the quantity is more or less, and there is no reasonable provision for the allowable value of positive deviation. A chemical enterprise produces more than 10 grams of a product per barrel, which is estimated to be worth more than one yuan. If this is the case, the annual cost will increase by more than one million yuan. Some enterprises produce paints, coatings and other products, even the gross weight is less than the nominal net content. The marking is very vague. Only the weight is marked. It is unclear whether the weight refers to "gross weight" or "net content". In order to maximize profits, individual private enterprises have deducted users for negative deviations. The third is that the daily supervision and inspection is a mere formality, and the sampling is unscientific and arbitrary. A food factory only spot checks one package of fresh milk produced in large quantities a day, without inspection specifications, and is unable to control whether the net content of quantitatively packaged goods meets the specified requirements

as a manufacturer of quantitatively packed commodities, in addition to strengthening the training of laws and regulations on the stable growth of scrap steel in the second day of measurement, improving the corresponding organizations, and conscientiously doing a good job in the basic work of measurement management within the enterprise, it should also achieve:

I. correctly selecting and equipping appropriate measuring instruments. According to the shape characteristics of the products produced by the enterprise and relevant national regulations, select and use quantitative packaging production equipment with appropriate accuracy requirements and stable measurement performance and measuring instruments used to test the net content of quantitatively packaged goods. In particular, the measuring instruments selected for liquid quantitative packaging commodities should be easy to operate, and the accuracy should meet the requirement that three thirds of the negative deviation can not be repaired by traditional methods. The enterprise standards prepared before 1995 should be revised to meet the requirements for negative deviation of net content in the provisions on metrological supervision of quantitatively packed commodities

II. Carefully manage the measuring instruments within the enterprise. For the measuring instruments listed in the catalogue of national compulsory inspection measuring instruments, apply to the metrological verification department for verification. For example, the selection precautions for the quantitative packaging pressure testing machine used in the food and beverage industry, the quantitative filling machine and other compulsory inspection measuring instruments must be regularly verified at fixed points. For the testing equipment used in the wire and cable industry that is not listed in the compulsory inspection catalogue but has an important impact on product measurement, calibration specifications shall be prepared, and scientific, reasonable and effective confirmation intervals shall be formulated, which shall be implemented after being approved by the technical director of the enterprise. Non mandatory measuring instruments shall also be verified in their own units or sent to metrological verification institutions for verification according to the needs of production and scientific research. Regularly check the use of measuring instruments, keep their integrity and use environment in line with requirements, and strengthen daily maintenance management

III. implement effective quality control in the production process. The measurement management personnel of the enterprise shall understand the product quality inspection data and the production process control inspection data, do not relax the inspection and control of the main production links that affect the product quality, change the post inspection into the pre control of the process, explore the best control point by using the measuring instruments, closely combine the measurement assurance with the production control, and use the mathematical statistics method to process the monitoring parameters, The possible process out of control shall be corrected in time to reduce and eliminate abnormal fluctuations in the process, control the source, eliminate problems in the bud, and ensure the stability of manufacturing quality. At the same time, pay attention to the measurement deviation caused by abnormal fluctuation during the use of the instrument. Continuously promote the use of new technologies and processes to achieve automatic metering and packaging. Ensure that the negative deviation specified in product standards or process documents conforms to the regulations or national mandatory standards

IV. do a good job in the measurement and monitoring of quantitatively packed goods. The weight of packages shall be strictly controlled during incoming inspection. Packages with good stability shall be selected, and the weight of packages shall be marked on the label to facilitate self inspection and consumer supervision. Make daily inspection records of quantitatively packed products. Measurement management personnel shall do a good job in sampling inspection and re inspection. For some quantitatively packed products that are easy to lose moisture, the tolerance of ex factory packaging and weighing should be scientifically and reasonably determined. For liquid products (especially those containing carbon dioxide), a set of simple, feasible, scientific and reasonable detection methods should be found out in practice. For example, the weighing method should be used to convert the volume and weight, such as the influence of material density, temperature and other parameters, to ensure that the net content meets the requirements. At the same time, the environmental conditions should also be effectively controlled, such as ensuring that the liquid packaged goods are packaged at 20 ℃

v. correctly use the legal unit of measurement and properly mark the products. The outer packaging shall be in accordance with the corresponding specifications. If it is necessary to mark the barcode according to the nature of the commodity, it must be marked with the barcode. For the food industry, it also needs to comply with GB7718 1994 general standard for food labeling

VI. do a good job in the internal measurement supervision of the enterprise, and pay attention to the collection and processing of external information, which is also an important reason why it is favored by customers. Link the measurement management work with the enterprise economic system and other work inspections, implement the measurement system documents, and correct problems in a timely manner. Attention should also be paid to collecting the supervision and inspection of the technical supervision department and the feedback of consumers, and timely study and deal with them

Author: zhengchaoyang, liqiufeng, Lou Liqun

source: China Metrology

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