How to choose the suitable for plastic hose: two

Second, protective packaging materials should have enough mechanical strength, a certain degree of barrier property, makeup nature resistance, weather resistance, etc. , to prevent the cosmetics produced in the process of filling, storage and transportation quality problems. （ 1) Mechanical properties. The most main function of packaging is to use its mechanical properties to ensure the content is not damaged. Cosmetics hoses mechanical properties such as compressive strength, impact resistance, resistance to bending strength and so on, mainly according to the nature of packaging products, packaging machinery, storage and transportation demands, etc. In general, plastic hose must have certain stiffness, to ensure the overall shape of the product in good condition; At the same time also need to have good resilience, to ensure that the extrusion can return to its original shape. However, in the same material composition and the thickness of the same conditions, the stiffness and resilience is a pair of contradictions, only has carried on the balance between the two, to meet customer demand. （ 2) The blocking performance. Commonly used cosmetics packaging soft block material with aluminum foil, EVOH, oxide coating PET and nylon, etc. , the barrier property because of the differences between the material and thickness of the different. Aluminum foil with high barrier property, for example, when the thickness of aluminum foil in more than 25 microns, the blocking performance of up to 100%; EVOH on oxygen barrier property and its thickness is proportional to the, 15 microns thick EVOH oxygen transmission rate is about 0. 3 to 0. 4cc/m2·24h（ Mocon test) ； Oxide coating the PET oxygen transmission rate generally is 0. 2 to 1. 0cc/m2·24h（ Mocon test) 。 Therefore, we should according to the requirements of the packaging of cosmetics to choose barrier property of different materials. In addition, the interactions of fragrance and packaging materials should also be considered, such as polyolefin material absorption of essential oil, can be in at this time between the aluminum foil and polyolefin materials increase a layer of protective coating. （ 3) Resistance to make-up character and weather resistance. Cosmetics wrapping plastic hose, the choice of materials should have the contents of cosmetics corrosion resistance performance, including the oil resistance, grease resistance, acid resistance, etc. , can according to actual conditions and needs of matrix resin for optimization to meet the application requirements, such as HDPE LDPE has better resistance to make up character. The material of plastic hose weather resistance and temperature resistance, dimensional stability, environmental stress cracking resistance and so on factors, only with the short or long term performance of plastic hose, in order to ensure safety and quality of cosmetics. Some cosmetics is suitable for use in cold winter, for example, if the use of conventional material such as PP plastic hose, the possible drop test do not pass, tube and a series of problems, in - this is because the PP plastic transition temperature Around 10 ℃, low temperature brittle, fragile. Where you need to adjust the formula structure of plastic hose, toughening materials use, improve the impact strength of plastic hose.