Analysis and Prospect of product quality in the ho

Analysis and Prospect of product quality in packaging machinery industry (III)

2 Vacuum packaging machine

2.1 product introduction

vacuum packaging machine is to automatically seal the packaging bag immediately after pumping it into a low vacuum. Due to the high vacuum degree in the bag, there is little residual air, which can inhibit the reproduction of microorganisms such as bacteria. For some soft items, the volume can be reduced after vacuum packaging. Thus, the packaged goods can achieve the characteristics of "four prevention, two provinces, and one quality guarantee": moisture-proof, mold proof, pollution proof, oxidation proof, volume saving, freight saving, and extended storage period. Vacuum packaging machine is applicable to all kinds of plastic composite film bags or aluminum foil composite film bags, such as polyester/polyethylene, nylon/polyethylene, polypropylene/polyethylene, polyester/aluminum foil/polyethylene, nylon/aluminum foil/polyethylene and other composite materials. This is a wind chime made of transparent resin materials used in intelligent camera lens and syringe, which is suitable for all kinds of raw and cooked food, fruits, native products, medicinal materials, chemicals, precision instruments, clothing Hardware products, electronic components, military products and other solid, powdery objects, liquids, solid-liquid mixtures are vacuum packed

vacuum packaging machine is also a large number of general-purpose mechanical products, which are widely used in light industry, food, medicine, chemical industry, military industry and other industries. At present, it is widely used in the packaging of domestic and export products. In the food industry, vacuum packaged food is very common. Various cooked food products, such as roast chicken, pickled duck, sausage, pickled vegetables, bean products, preserved fruits and other foods that need to be preserved, are increasingly using vacuum packaging, which can greatly improve the preservation and shelf life of food. If the packaging quality is not good, or the vacuum degree does not meet the requirements, the food will deteriorate and rot. if consumers eat this kind of deteriorated food, they will be poisoned and endanger their health

in drugs, chemicals, precision instruments and military products, new packaging technologies have been continuously adopted recently, and the packaging process has been improved. The use of vacuum packaging equipment for packaging has increased year by year. The quality of vacuum packaging equipment directly affects the quality of final products in many related industries, and directly affects the interests and health of consumers

2.2 basic information of vacuum packaging machine production enterprises

the production and use of vacuum packaging machines are large. At present, there are about 60 production enterprises in the country. From the situation reflected by users, there are still various problems in product quality. This time, 18 prototypes from 18 enterprises producing vacuum packaging machines in Shanghai, Shandong, Jiangsu and Zhejiang Province, the main production places of this kind of packaging machines, were randomly selected. The inspection results showed that 16 products of 16 enterprises were qualified, and the qualified rate was 88 9％。 The inspected enterprises include collective, private, individual, joint-stock and wholly-owned enterprises. From the nature of the enterprise, one wholly-owned enterprise was selected, and all the products were qualified, with a qualification rate of 100%; There are 6 joint-stock enterprises, and all products are qualified through random inspection, with a qualification rate of 100%; There is one collective enterprise, and the qualified rate of the products sampled is 100%; There are 8 private enterprises, and 7 products are qualified, with a qualification rate of 87.5%; There are two individual enterprises, and one of the products tested is qualified, with a qualification rate of 50%

enterprises producing vacuum packaging machines nationwide are mainly concentrated in Zhucheng, Shandong, Nantong, Jiangsu and Wenzhou, Zhejiang. There are more than 20 enterprises of different types in Zhucheng alone. Among them, there are hundreds of wholly-owned enterprises and small family workshops composed of several people. Some small enterprises have poor production conditions, backward technology and equipment, and lax grasp of production process and quality inspection. In order to seek more benefits, they often adopt vicious competition to lower prices. Vacuum pumps and inferior materials with poor performance of open-loop control system have an impact on the products of formal production enterprises

the enterprises in this spot check are divided into: 1 wholly-owned enterprise, accounting for 5.6% of the number of enterprises in the spot check; One collective enterprise, accounting for 5.6% of the number of enterprises sampled; There are 6 joint-stock enterprises, accounting for 33.3% of the number of enterprises sampled; There are 8 private enterprises, accounting for 44.4% of the enterprises selected, and 2 individual enterprises, accounting for 11.1% of the enterprises selected

2.3 comprehensive analysis and evaluation of inspection results

a total of 18 products from 18 production enterprises were randomly selected, and the products were all recently produced and qualified products. The inspection results showed that 16 products of 16 enterprises were qualified, and the qualified rate of product sampling was 88.9%

these 18 vacuum packaging machine manufacturing enterprises account for about 30% of the national vacuum packaging machine manufacturing enterprises, including 6 large-scale enterprises, accounting for 33.3% of the number of enterprises in the spot check, 7 medium-sized enterprises, accounting for 33.9% of the number of enterprises in the spot check, and 5 small enterprises, accounting for 27.8% of the number of enterprises in the electronic tensile machine in this statistics. The result of spot check shows that the qualified rate of products decreases with the reduction of enterprise scale. The products of 13 large and medium-sized enterprises are all qualified, and the sampling qualification rate is 100%. Two of the products of five small enterprises are unqualified, and the sampling qualification rate is 60%. This spot check gives consideration to collective, private, individual, joint-stock and wholly-owned enterprises, which basically reflects the current national quality level and industry quality status of vacuum packaging machine products

in terms of the nature of the enterprise, one wholly-owned enterprise was selected, accounting for 5.6% of the enterprises selected. The products selected were qualified, and the qualification rate was 100%; There are 6 joint-stock enterprises, accounting for 33.3% of the enterprises in the spot check. All the products in the spot check are qualified, and the qualification rate is 100%; There is one collective enterprise, accounting for 5.6% of the enterprises in the spot check. The products in the spot check are qualified, and the qualification rate is 100%; There are 8 private enterprises, accounting for 50% of the enterprises selected, and 7 products are qualified, with a pass rate of 87.5%; There are two individual enterprises, accounting for 11.1% of the enterprises in the spot check. One of the products in the spot check is qualified, and the qualification rate is 50%

seven enterprises in Shandong were selected, accounting for 38.9% of the enterprises selected; Five enterprises in Zhejiang were selected, accounting for 27.8% of the enterprises selected; Four enterprises in Jiangsu were selected, accounting for 22.2% of the enterprises selected; Two enterprises in Shanghai were randomly selected, accounting for 11.1% of the enterprises. According to the results of the spot check, the enterprises in Shanghai will face a sense of further urgency and the products of the seven enterprises in Zhejiang will all be qualified. Among the 4 enterprises sampled in Jiangsu, 3 enterprises' products are qualified, and the qualification rate is 75%; At present, six of the seven enterprises sampled in Shandong have qualified products, with a pass rate of 85.7%. Zhucheng, Shandong Province is a new base for the production of vacuum packaging machines in China. Although one enterprise is unqualified, most of the products of enterprises have good performance and high overall quality

enterprises with good product quality in this spot check include Zhucheng Xiaokang food packaging machinery Co., Ltd., Shanghai Qingbo food packaging machinery Co., Ltd. and Shanghai People's packaging Co., Ltd

Zhucheng Xiaokang Food Machinery Co., Ltd. is a wholly-owned enterprise in Taiwan, which has passed the ISO9000 quality system certification. The enterprise pays attention to internal quality and focuses on the safety and convenience of operators, and its inspection items are all qualified

Shanghai qingpa food packaging machinery Co., Ltd. is a medium-sized private enterprise, which developed and professionally manufactured vacuum packaging machines of various models and specifications in the early 1990s. Its products are good in performance, mark and appearance, and all its inspection items are qualified

Shanghai People's packaging Co., Ltd. was a large state-owned enterprise. In order to survive and develop in the fierce market competition, the enterprise withdrew from the state-owned sequence and carried out restructuring. Since the company first launched the vacuum packaging machine in China in 82, its products have undergone several reforms. The internal quality and appearance quality of the products are good, and all the inspection items are qualified

the standards for this spot check are mainly gb/t general technical conditions for vacuum and vacuum inflatable packaging machines and JB safety requirements for packaging machinery. The key items of the above three products: vacuum chamber pressure increment and heat sealing strength are higher than the requirements of the standard. The standard requires that the pressure increment of the vacuum chamber should not be greater than 1.07kpa, and the three enterprises are 0.15kpa, 0.25kpa and 0.53kpa respectively. The heat sealing strength of the packaging bag refers to the tensile force that the 15mm long sealing line can bear: generally, the composite bag is ≥ 5.9n, and the cooking bag is ≥ 22.6n. The indicators of these three enterprises were 47.5n, 48.2n and 46.5n respectively, several times higher than the standard requirements, ensuring the quality of packaged products

the unqualified items in the inspection mainly include:

1) the minimum absolute pressure of the vacuum chamber is unqualified. When the cover of the vacuum packaging machine is closed, the vacuum pump pumps air from the working room. When the vacuum pump reaches the limit, the pressure of the vacuum chamber is the lowest absolute pressure of the vacuum chamber, and the standard provisions shall not be greater than 1.3332kpa

2) the pressure increment of vacuum chamber is unqualified. Under the external standard atmospheric pressure, the initial pressure of the vacuum chamber is 1.3332kpa. After 1min leakage, the pressure increment shall not be greater than 1.07kpa. The pressure increment of one product vacuum chamber is 3.68kpa, which is far beyond the range required by the standard

according to the results of this spot check, the qualified rate of the spot check is 88.9%, and the conformity rate of push mark evaluation is 88.9%. Although the qualified rate is high, the information fed back by users shows that the qualified rate of market products is still lower than that of this spot check. In addition, the material requirements for key parts are not specified in the standard. Some users reported that some products cut corners on work and materials, and the plate of the box used is too thin. When vacuuming, the deformation of the box cover is too large, and the box cover will crack after half a year of use

in this sampling inspection, it is impossible to carry out long-term operation test on the machine according to the standard. It is suggested to modify the current standard and add the limit on the time of extreme vacuum degree, the limit on the deformation of box cover, and the requirements on the materials and processing technology of key parts to ensure the product quality. At present, the revision of the standard has been basically completed