In the previous article, Yu plastic packaging with a large article focusing on theWhat plastic production cosmetic hose good，其中得出在同等選擇中，pet塑料是生產(chǎn)化妝品軟管不錯的材料之一。但是生產(chǎn)軟管并不只有pet這一個(gè)材料，也不是最常見(jiàn)的材料，那么下面介紹一下常見(jiàn)的化妝品軟管材料選擇：

Cosmetic plastic hose material is generally vinyl chloride monomer, in peroxide, azo compounds and other initiators, or under the action of light, heat, according to the free radical polymerization reaction mechanism polymerization. Vinyl chloride homopolymer and vinyl chloride copolymer collectively referred to as vinyl chloride resin. The material is a non-crystalline material.PVC materials are often used with stabilizers, lubricants, auxiliary processing agents, colorants, anti-impact agents and other additives. It has non-flammability, high strength, weather resistance and excellent geometric stability.

PVC is highly resistant to oxidizing agents, reducing agents and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid and is not suitable for contact with aromatic and chlorinated hydrocarbons.

Cosmetic plastic hosePipe selection:

A. Hygiene of cosmetic plastic hose materials

First of all, the materials used should meet the relevant health standards, heavy metals, fluorescent agents and other harmful substances should be controlled within the prescribed limits. For example, the hose exported to the United States, the polyethylene (PE), polypropylene (PP) to meet the U.S. Food and Drug Administration (FDA) standard 21CFR117.1520.

B. Barrier properties of cosmetic plastic hose materials

If the contents of the daily chemical enterprise packaging is some of the oxygen is particularly sensitive (such as some whitening cosmetics) or fragrance is very easy to volatile (such as essential oils or some oils, acids, salts and other corrosive chemicals) of the product, this time should be used in five-layer co-extruded tube. Because five-layer co-extruded tube (polyethylene/bonding resin/EVOH/bonding resin/polyethylene) oxygen transmission rate is 0.2 ~ 1.2 units.

In contrast, the oxygen transmission rate of ordinary polyethylene single-layer pipe is 150 to 300 units. In a certain period of time, holding ethanol weight loss rate test co-extruded tube is dozens of times lower than the single-layer tube. In addition, EVOH is a kind of ethylene - vinyl alcohol copolymer, with excellent barrier properties, aroma retention (thickness of 15 to 20 microns is the most ideal effect) double-layer tube: the use of high-density HDPE and LDPE low-density PE material, in a certain proportion with the matching of the pumping mode, high-speed rotation to achieve the effect of mixing evenly, this way can be properly adjusted hose This way can properly adjust the softness and hardness of the hose, relative to the single-layer tube, the tube body is thicker, with better corrosion resistance barrier, lower oxygen permeability, by the majority of daily cosmetics manufacturers.

C. Firmness of cosmetic plastic hose material

Daily chemical companies have different requirements for hose stiffness, so how to get the desired stiffness? Polyethylene commonly used in hose is mainly low density polyethylene, high density polyethylene and linear low density polyethylene. The stiffness of HDPE is better than that of LDPE, so the desired stiffness can be achieved by adjusting the HDPE/LDPE ratio.

D. Chemical resistance of cosmetic plastic hose materials

High density polyethylene has better chemical resistance than low density polyethylene.

E. Weather resistance of cosmetic plastic hose materials

To control the short or long term performance of a hose, factors such as: appearance, pressure/drop resistance, seal strength, environmental stress crack resistance (ESCR value), flavor and loss of active ingredients need to be considered.