In recent years, with the continuous improvement of people's living standards and the whole society of food nutrition and health of the general, highly valued, all kinds of brands, ingredients, packaging dairy products are full of shopping malls shelves. The milk product, especially the metal cans of milk powder due to high, absorptive capacity, for the strong, easy to use, open the tank after storage time relatively long, etc. into a subdivision of the deployment of nutrition, it is become the infants and young children, the elderly, patients with the most common ideal dairy foods.
Therefore, the demand for milk powder tank has been increasing year by year, in recent years, domestic such as Shenzhen, Shanghai, Shandong Lacey, Harbin and other places has appeared many large scale, intensive degrees higher milk cans professional canning factory and higher efficiency of dedicated production lines. The market competition situation of milk cans, from south to north, has been fully over now.
According to the survey, in the domestic market, the most common milk powder cans of its top sealing structure is mainly divided into two kinds:
Picture 1, currently widely used cover
I picture cover is mainly composed of a ring cover (also called cover), pry cover (also known as the core cover with a cover, and aluminum film), the three part. The aluminum film produced in the process of punching and cutting together with the ring cover to ensure the sealing requirements at the top. Picture cover book completed by the empty pot plant, milk powder from the bottom filling and canning factory finished bottom capping.
For the first time opened, need to open the lid and pry torn aluminum film. When not in use, the cover can be deducted to delay the time of wetting and deterioration of the milk powder.
Cover structure of cluster is currently the vast majority of domestic milk powder tank is widely used at the top of the sealing structure, at the same time, this structure is widely used in many paint chemical products, tea, biscuits and other metal cans (the aluminum film can be determined according to the products).
2, Nestle used a ring cover paste easy to tear the aluminum film (ALUFIX aluminum seal)
LawsonMardonSingenGmbH Lawson Marton seengen company
The structure of the abolition of the pry the cover in the ring cover above the hot melt glue sealing posted a layer with a pull ring easy tearing foil, the same effective ensures the seal at the top. When the structure is adopted, the air tank factory is generally sealed by the bottom cover, and the top cover (the ring cover which is easy to tear off the aluminum foil) is sealed by the solid pot factory in the milk powder filling.
For the first time opened, only through the ring torn aluminum foil can be,
Very convenient。 When not in use can buckle on plastic cover (the primary and secondary structure of milk powder tank cover are also equipped with plastic buckle cover), to delay the time of milk powder damp metamorphism.
Compared to the above two kinds of structure, the seal and the opening of the milk powder after the preservation period because of the use of plastic cover can be said to be basically the same.
In the first opening, the ring cover Nestle paste easy to tear foil structure undoubtedly is of great convenience. From the cost perspective,
Composite cover structure comprises a cover ring, pry the cover and aluminum foil (with a large number of iron), and ring gega paste easy to tear foil structure includes a ring cover and easy tearing foil, due to the easy tearing foil even includes a ring cover are required in conjunction with imported. Therefore, the cost of both are relatively high.
Sealing structure of the top of the folding mouth milk powder pot on the Japanese market
The top sealing structure not only needs to be covered, but also has no need of ring cover, and has better effect of section material. Depending on the platform of the double-layer folding of the mouth of the tank, the common aluminum foil is directly bonded to the aluminum foil, and the sealing effect can be achieved. It provides a new idea to improve the sealing structure of the top. But the deficiency is also very obvious, from the section can be seen, the structure of the shape is more complex, manufacturing process and more, mold precision requirement is high, the number of required equipment and investment is inevitable. For lower cost cans, save with the consideration of iron, in reference to the Japanese Folding port on the basis of the structure, we propose a new milk cans at the top of the sealing structure.
According to a rough calculation, the ring cover in the formula can be used in the proportion of iron by about 15% or so, if coupled with the pry cover, then more than 20% (calculated by LKG tank). If it can be omitted, the material cost savings will be quite significant. To this end, we conducted a feasibility study and a series of process tests, and achieved some initial results.
The sealing structure of the top sealing structure of the milk powder can not only remove the pry cover, but also cancel the ring cover to realize the original intention of the section material. The top part of the tank body by the post necking forming platform, can be directly paste with ordinary aluminum foil or an easy tearing foil (the sealing performance, opening convenience, after opening the storage period and the first two same structure), but also improve the tank mouth strength, compensation due to export to cancel ring cover which may be made into the tank strength weakened. And compared to the Japanese folding structure, process, process, equipment are greatly simplified. After the opening of the tank, the side handle can be ensured to be close and reliable with the plastic cover.
The sealing structure, additional equipment mainly includes necking machine and jar jar film (foil) machine. These two types of equipment at home and abroad at present there is no ready-made products.
According to the results of technical tests, the tank mouth necking process, need to be arranged in the flanging process before and after the rolling process.
On the principle of opening film (foil) process can be completed by the air tank factory, also can be done by filling in the milk after canning factory. But considering the filling may inevitably there will be a small amount of milk powder residue on the shrinkage of the neck platform, resulting in the film decreased strength and sealing performance degradation. Therefore, tank opening film process by the empty tank factory completed should be more ideal. And the bottom cover sealing is completed by the solid tank factory in the milk powder filling.
The sealing structure of the top sealing structure of the new formula is still in the process of the test stage, the most reasonable size of the shrink neck still need to be further determined. Due to the tank mouth shrinking neck and a pot opening film (foil) machine is no ready-made products, its design, manufacturing process may be there are some technical problems need to be solved; rolling rib, sealing die to do corresponding changes; aluminum foil or aluminum foil, non-toxic hot melt adhesive easy tear etc. and raw and auxiliary materials to set; because of the tank mouth paste foil process best by empty tank factory completed, the resulting bare stick cylinder of empty cans in storage, transportation, the order of production in the process of how to prevent the damage of aluminum foil and glue issues need to be considered. Other aspects such as: downstream customers and end users of the recognition and acceptance, the development of technical standards is also very important.
Have been solved in the above problems better, we believe that this new type of milk powder tank top sealing structure due to the advantages of the materials will have a good application prospect in the market, not only can be used for milk cans and can also be used in other at room temperature, no vacuum requirements of powdery, granular contents canned.
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