Production process and lubrication requirements of

Aluminum foil lunch box production process and lubrication demand

-- win win guarantee for food safety, production efficiency and cost control

with the continuous improvement of aluminum foil production process, aluminum foil has become more and more prominent in the food packaging industry because of its plasticity, safety, health, environmental protection and reuse. Among them, formed aluminum foil lunch boxes are widely used in aviation food and catering supply for large-scale activities because of their convenience and portability, It has developed rapidly in recent years. The development of the industry has brought higher production requirements and industry standard requirements. How to correctly select lubricating products suitable for the production process of aluminum foil lunch boxes to ensure higher food safety and production efficiency is becoming a problem that many aluminum foil lunch box enterprises pay close attention to

what is food lubricant

the lubricating oil used in food aluminum foil packaging must meet all the characteristics of conventional lubricating oil, that is, to achieve all the technical parameters required to reduce friction and wear, and to avoid corrosion, good heat dissipation performance, sealing effect, etc. In addition, they also need to meet food regulations and biological inertia, that is, they do not affect taste, smell or color, and meet multiple international standards

the certification of food grade lubricating products is divided into 3h, H1 and H2. The certification is selected by NSF International Organization (independent certification body)

3h grade lubricating oil is suitable for those occasions where the lubricant must contact with food, such as oven mold

h1 grade lubricating oil is suitable for those occasions where the lubricant is easy or cannot avoid contact with food

h2 grade lubricating oil is suitable for those occasions that cannot have direct contact with food

aluminum foil lunch box production process and lubrication requirements

the production process of aluminum foil lunch box is roughly divided into six steps: spreading → oiling → it is understood that feeding → punching cast iron, and the proportion of height and diameter of the compacted specimen is 2:1 press molding → blanking → detection. During the production process, the aluminum foil is subjected to a punching pressure of 40-80 tons, the punching frequency is 1-2 seconds, the average production capacity is 20000 pieces/day, and the shelf life of aluminum foil lunch boxes is 2 years. In this production process, lubricating oil plays a very important role, including: heat dissipation, temperature reduction, protection of aluminum foil surface, protection of stamping equipment and molds, rust prevention, corrosion prevention and prevention of aluminum foil surface adhesion (suitable for the situation that aluminum foil pre coated with lubricating oil needs to be rolled up, such as aluminum foil oiling in aluminum factories)

what specific requirements does the aluminum foil lunch box industry have for lubricants and lubrication methods

1) viscosity and load-carrying performance: the viscosity range of lubricating oil required by the aluminum foil lunch box industry is 2~150 mm2/s, and the appropriate viscosity grade is selected according to the aluminum foil material, the type and overall size of the lunch box. For example, wrinkle free lunch box, because its aluminum foil is thick, leading the new trend of the industry, and the aluminum foil has a large extension and deformation in the production process, it should choose a lubricating oil with high viscosity, and the lubricating oil must have excellent lubrication performance and load-bearing performance. If the lubricating oil is not selected properly, the high lubrication requirements of wrinkle free lunch boxes can be achieved only after multiple applications of lubricating oil

2) temperature resistance: due to the high punching pressure in the production process, which reaches more than 40 tons, and the high punching frequency, the surface of the equipment and the mold generates heat due to friction. If the heat is not dissipated in time, the service life of the equipment and the mold will be greatly reduced. The maximum working temperature of the equipment and mold is about 70 ℃, and the reasonable high temperature resistance of the lubricating oil needs to be higher than this temperature by more than 20 ℃, that is, the reasonable temperature resistance range of the lubricating oil is: -10 ℃ ~90 ℃

3) oil amount: different aluminum foil materials, lunch box types and overall dimensions have different requirements for the amount of lubricating oil, and the range of oil amount required is 30mg~1g/m2. If the amount of oil is low, the lubrication is insufficient, and the produced lunch box is easy to be deformed, damaged or even scrapped; On the contrary, if the amount of oil is high, the lubrication is excessive, and the produced lunch box is easy to stick to the surface of the mold, which is not easy to drop material, so it needs to be shut down and taken out, resulting in a serious impact on the production efficiency. At the same time, excessive lubrication is also a waste

using krub food grade lubricant paraliq P 68, the production qualification rate of aluminum foil lunch boxes has reached 99%

4) oiling method: according to different lubrication requirements, oiling methods include single-sided oiling and double-sided oiling. Single sided oiling is suitable for occasions with simple type of lunch box, small deformation of aluminum foil and low lubrication requirements. This oiling method can strictly control the amount of oiling and avoid unnecessary waste. For example, when stamping aluminum foil containers for egg tarts, when using krub paraliq P 68, as long as one side oiling can meet the required lubrication requirements; If ordinary lubricating oil is used, it still needs to be oiled on both sides. In most cases, double-sided oiling is the main way

5) oil removal (when using ordinary lubricating oil): after stamping the aluminum foil lunch box, if food grade lubricating oil is not used, the oil on its surface must be removed first, because ordinary lubricating oil cannot be in direct contact with food. If the surface layer is not degreased, it will affect the color, taste and even safety of food. Once ordinary lubricating oil enters the human body, it cannot be decomposed and not excreted. It will remain in the human body for a long time. If it is eaten for a long time, it will cause physical discomfort or dizziness in light cases, and poisoning in severe cases. However, at present, the removal of lubricating oil on the surface of aluminum foil is still an extremely complex process and expensive

6) shelf life of aluminum foil lunch boxes: finished aluminum foil lunch boxes are not directly in the hands of consumers, and need many intermediate links such as inventory, transportation and sales. Especially for many export-oriented lunch box manufacturers, the time-consuming shipping cycle alone is more than two months. Therefore, the shelf life of finished aluminum foil lunch boxes must be more than one year, and the regulation of many European and American countries is two years. That means that the shelf life of the lubricating oil on the surface of aluminum foil lunch boxes should also be at least 2 years. Ordinary lubricants and olive oil used by some enterprises cannot meet the requirements of this shelf life

to sum up, aluminum foil lunch boxes have quite high requirements for lubrication. Choosing suitable high-performance lubricants can ensure higher production efficiency, higher product qualification rate, longer service life of equipment and molds, lower labor costs, lower energy consumption, and thus bring more benefits to enterprises

according to the special lubrication requirements of the aluminum foil lunch box industry, krub lubricant company has launched a variety of food grade lubricants with H1 or 3H certification, such as krub paraliq P 68 stamping oil specially developed for the aluminum foil industry. This oil is colorless, tasteless and belongs to the food grade. It is outstanding in lubrication, loading, friction surface protection, rust prevention/corrosion, etc. The shelf life of this series of sealed products is 5 years, which can fully meet the requirement of 2 years shelf life of aluminum foil lunch boxes. This series of products are widely used in medicine or health care products, aviation 5.2 color empty food, milk powder packaging, composite aluminum foil packaging and other industries in Europe, America and Asia. This special food grade lubricant can directly contact with food, eliminating the complex and expensive work of removing oil from the surface of aluminum foil, and these lubricants only need a small amount to achieve all the above lubrication and protection properties, which not only ensures food safety, but also improves production efficiency and reduces production costs

aibang aluminum foil lunch boxes at the WorldExpo

food grade lubricants improve the safety of aluminum foil lunch boxes

aluminum foil lunch boxes have direct contact with food. According to the definition of NSF, "H1 or 3H grade lubricants are suitable for those places where lubricants are easy or cannot avoid contact with food". Therefore, food grade lubricants must be used in the production process of aluminum foil lunch boxes to ensure food safety

the safety of lubrication is being realized by more and more aluminum foil lunch box enterprises. As the only designated aluminum foil lunch box supplier of Shanghai WorldExpo, Shanghai aibang aluminum foil products Co., Ltd. will supply 100000 pieces per day to the central kitchen of the Expo site during the 184 days of the exhibition. The production of a total of 18.4 million aluminum foil lunch boxes used krub paraliq P 68 stamping oil as lubrication, which fully guaranteed the food safety of staff and volunteers during the Expo

"the lubricating oil used on the aluminum foil packaging of food must meet all the characteristics of conventional lubricating oil, but also need to meet the food regulations and biological inertia, that is, it does not affect the taste, smell, color, and conforms to multiple international standards."

high quality lubricating oil improves the production efficiency of aluminum foil lunch boxes

in addition to food safety considerations, high-quality lubricating oil can also help improve the production efficiency of aluminum foil lunch box enterprises and realize cost control

1) excellent food grade lubricating oil can improve the qualification rate of aluminum foil lunch box production, save the time of maintenance personnel, and further improve production efficiency

2) in terms of equipment and molds, the characteristics of high-quality lubricants will be more prominent. Due to good lubrication, the protection of components is strengthened and the service life is extended, which can save more costs

3) when using high-efficiency special lubricating products, the equipment not only improves the operation efficiency, but also reduces the energy consumption. This is more obvious from the perspective of the whole factory

taking Shanghai aibang aluminum foil products Co., Ltd. as an example, through the adjustment of production lubrication links, using high-quality Krupp food grade lubricant paraliq P 68, the company's annual production efficiency can be increased by 10%, the labor cost can be increased by 10%, the service life of the equipment can be extended by more than 20%, and the product qualification rate can also be improved by 5%

the use of appropriate food grade lubricants can help aluminum foil lunch box manufacturers achieve "win-win" results in the three aspects of "food safety", "production efficiency" and "cost control", and comprehensively enhance the competitiveness of enterprises

as a safe and environmental protection material with light material, low density, high barrier, blackout, UV linearity resistance, good moisture resistance, good corrosion resistance, good insulation, long shelf life, good ductility, flexibility and high resource recycling, aluminum foil will become a continuous choice for perfect food packaging. According to relevant data, China's per capita annual consumption of aluminum is about 2kg, about 1/10 of that of developed countries and 1/3 of that of the world. According to the statistics of European aluminum foil industry association, more than 70% of aluminum foil in Europe is used in all kinds of packaging products. In the United States, this ratio is as high as 75%, and in Japan, the consumption of aluminum foil for packaging accounts for 70%, of which food packaging alone accounts for 30% of the consumption of aluminum foil. According to incomplete statistics, China's annual export of aluminum foil lunch boxes is about US $300-500 million. It can be seen that the global market demand for aluminum foil lunch boxes and aluminum foil packaging products will be irreplaceable and sustainable in the future

the main application fields of aluminum foil packaging are: convenience food, aviation food, dairy products, soft drinks, tobacco products, drugs or health products, carbonated drinks/beer/herbal tea products, etc

authors: Wu Jinxiang, Li Zhenning, Kluber lubrication (Shanghai)

Zhang Songyue, Ashburn aluminum foil (end)