In the cosmetic industry, packaging quality is the second life of a product. According to the characteristics and sales of cosmetics and other factors, choosing the appropriate plastic tube as the packaging can make the cosmetics more attractive under the contrast of high-quality packaging.
1. Hygiene and safety
Cosmetics are in direct contact with the human body, which puts forward high hygienic and safety requirements for their packaging. For plastic hoses, it should be controlled from the aspects of raw material safety (raw material particles must comply with relevant laws and regulations, such as FDA, SGS certification, etc.), production process, production environment, etc., so as to ensure the hygiene and safety of the cosmetics inside.
2. Protective
Packaging materials should have sufficient mechanical strength, a certain degree of barrier property, chemical resistance, weather resistance, etc., to prevent cosmetic quality problems during filling, storage and transportation.
(1) Mechanical properties. The main function of packaging is to use its mechanical properties to ensure that the contents are not damaged. The mechanical properties of plastic hoses for cosmetic packaging, such as compression resistance, impact resistance, bending strength, etc., are mainly determined according to the properties of the packaged products, packaging machinery, storage and transportation requirements. Generally speaking, plastic hoses must have a certain degree of stiffness to ensure that the overall shape of the product is intact; at the same time, it also needs to have good resilience to ensure that it can return to its original shape after being squeezed. However, under the condition of the same material composition and the same thickness, stiffness and resilience are a pair of contradictions. Only by taking into account the two can we meet the needs of customers.
(2) Barrier performance. Commonly used barrier materials for plastic soft packaging for cosmetic packaging include aluminum foil, EVOH, oxide-coated PET and nylon, etc., and their barrier properties vary depending on the selected material and thickness. For example, aluminum foil has high barrier properties. When the thickness of aluminum foil is above 25 μm, its barrier performance can reach 100%; the barrier property of EVOH to oxygen is proportional to its thickness, and the oxygen permeability of EVOH with a thickness of 15 μm is about 0.3 ~ 0.4cc/m2 ·24h (mocon detection method); the oxygen permeability of PET with oxide coating is generally 0.2～1.0cc/m2·24h (mocon detection method). Therefore, materials with different barrier properties should be selected according to the requirements of the packaged cosmetics. In addition, the interaction of fragrance and packaging materials should also be considered, such as the absorption of essential oils by polyolefin materials, in which case a protective coating can be added between the aluminum foil and the polyolefin material.
(3) Chemical resistance and weather resistance. The material selected for the plastic hose for cosmetic packaging should have the properties of resistance to chemical corrosion of the contents, including oil resistance, grease resistance, acid resistance, etc. The matrix resin can be optimized according to actual conditions and needs to meet the use requirements, such as HDPE Better chemical resistance than LDPE.
The weather resistance of plastic hoses is related to the temperature resistance, dimensional stability, environmental stress cracking resistance and other factors of the materials used. Only by ensuring the short-term or long-term performance of plastic hoses can the quality and safety of cosmetics be guaranteed. For example, some cosmetics are suitable for use in cold winter. If the plastic hose uses conventional materials such as PP, there may be a series of problems such as failure of the drop test and tube burst. This is because the glass transition temperature of PP is around -10°C. , brittle and brittle at low temperature. At this time, it is necessary to adjust the formula structure of the plastic hose, and use toughening materials to improve the impact strength of the plastic hose.
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