Basic requirements for milk powder packaging
1. Safety (1) Hygiene As a packaging of direct contact food, its hygiene is the most basic requirement. According to the national standard, it is generally required that the evaporation residue should not contain heavy metal elements such as lead and antimony that affect human health, the total number of bacteria should be less than 1000/100cm2, and Escherichia coli should not be detected. (2) Residual amount of solvent Due to the necessity of the packaging film production process, it is inevitable to use inorganic solvents. Affected by various factors, the applied inorganic solvent cannot be completely removed. Therefore, the control of residual solvents has become an important issue that both packaging manufacturers and end users have to face. 2. Odor-free milk powder products are very sensitive to the taste of packaging materials. The foreign breath will change the charm of milk powder, and even harm the health of consumers. The odor of the composite film mainly comes from two aspects: one is the residual solvent, and the other is the taste of the film itself (if it comes from the three-layer co-extrusion film or the single-layer PE film). 3. Sealed milk powder is a product that can easily absorb moisture and is easily oxidized and deteriorated. Milk powder packaging requires that the sealing of the packaging bag must be good, and no air leakage may occur. 4. Compatible with automatic packaging For milk powder packaging bags used for automatic packaging, in addition to the above three requirements, the packaging film is also required to have good compliance with automatic packaging machines. The most important parameter here is the coefficient of friction of the inner and outer layers. The development trend of milk powder packaging 1. Benzene-free ink and alcohol-soluble ink will become the mainstream trend of milk powder packaging and printing. With the strengthening of people's awareness of environmental protection and health, and the introduction of the country's mandatory policy on solvent residues, benzene-soluble ink will not be satisfied with milk powder packaging. The request was gradually replaced by benzene-free ink and alcohol-soluble ink. In fact, several large packaging manufacturers have rarely used benzene-soluble inks, and most of them are using benzene-free inks or even more environmentally friendly alcohol-soluble inks. 2. The application of special aluminized film is affected by the price and the shortcomings of the nature of aluminum foil. High-isolation aluminized film materials have become the goal of cooperation between packaging manufacturers and milk powder manufacturers. It is believed that in the near future, high-barrier aluminized materials will replace aluminum foil and be widely used in milk powder packaging
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