Types and development trend of the hottest plastic

Types and development trends of plastic composite hoses

whether it is cosmetics, medicine or food, the first thing to consider in packaging is the sanitary performance, followed by the mechanical strength, barrier performance, printing adaptability and chemical resistance. Industry insiders pointed out that in recent years, the treatment and recycling of waste plastics must also consider the economy and convenience of use

compared with the packaging of other products, cosmetics packaging has higher requirements on water and oxygen resistance. On the one hand, water containing fat may contain mold and yeast, which will produce fat and oxidation. Fat hydrolyzes fat, oxidizes fatty acids and glycerides. Therefore, increasing the moisture in the oil will cause the hydrolysis of the oil on the one hand, and accelerate the automatic oxidation reaction on the other hand, providing a living environment for microorganisms and reducing the vitality of some antioxidants such as polyamines. In addition, some powdered products should be prevented from caking, hardening and deterioration due to the absorption of water, so many cosmetics packaging needs to block the entry of water; On the other hand, some water containing products are used to clean the skin, so it is necessary to maintain a certain moisture content for a certain period of time. Therefore, it is necessary to prevent the escape of water. Oxygen is the main factor causing the rancidity of cosmetics. Most cosmetics contain oil. Unsaturated bonds in oils and fats are easy to oxidize and cause deterioration and rancidity. As long as a small part of unsaturated oil begins to oxidize, it will cause complete rancidity of oil and reduce the quality of products. Therefore, in the production, storage and use of cosmetics, we should try our best to avoid the occurrence of oil rancidity and prevent the entry of oxygen

in general, plastic composite hose has incomparable advantages over other materials. Therefore, since its inception, it has emerged in the packaging of cosmetics and drugs. At present, it has become an indispensable packaging form for cosmetics and drugs

plastic composite hose is mainly used in the packaging of cleaning cream, facial cleanser (milk), shower gel, shampoo, shampoo, conditioner, hair dye, local ointment, depilatory cream, toothpaste and other products in the cosmetics industry; In the pharmaceutical industry, it is mainly used for the packaging of external drugs such as cream and plaster

classification and structure of plastic composite hose

plastic hose can be divided into single-layer hose and multi-layer hose according to material classification

single layer hose includes metal hose and plastic extrusion hose; Fr é D é rique MUTEL, President and CEO of multilayer soft JEC group, said: "For a long time, pipes include aluminum-plastic composite hoses, plastic composite hoses and plastic coextrusion hoses.

according to the classification of processing technology, hoses can be divided into seamless pipes and slotted pipes. Seamless pipes include cold stamping forming, rolling forming and extrusion forming; slotted pipes include high-frequency welding, ultrasonic welding, thermal welding and other molding methods. Extrusion molding can process multi-layer or single-layer plastic hoses.

structure of aluminum-plastic composite pipes

the earliest aluminum-plastic composite pipe materials are: Polyethylene/adhesive resin (white)/paper/adhesive resin/aluminum foil/adhesive resin/polyethylene

the commonly used materials are polyethylene/adhesive resin (white)/aluminum foil/adhesive resin/polyethylene

structure of plastic composite hose

there are four typical structures of plastic composite hose:

1 Polyethylene (outer layer)/adhesive resin (white)/ethylene vinyl alcohol/adhesive resin/polyethylene (inner layer)

2. Polyethylene (outer layer)/adhesive resin (white)/polyester (or coating with SiO, Al2O3, etc.)/adhesive resin al2o3/polyethylene (inner layer)

3. Polyethylene/adhesive resin (white)/polyester/adhesive resin

4. Polyethylene/adhesive resin/vinyl alcohol/adhesive resin/polyethylene

comparison between composite hose and multi-layer coextrusion hose

it can also significantly reduce procurement costs, improve vehicle power and enhance its safety. Compared with multi-layer coextrusion hose, sewn composite hose has more advantages, but with the development of multi-layer coextrusion technology, this situation may change in the future

hygienic requirements for composite hoses

at present, there is no unified hygienic standard for composite hoses in the world, but generally, the following indicators can meet the requirements of China and most countries and regions such as the United States, Japan and Europe

development trend of composite hose sheet

the development of composite hose sheet shows the following trends:

aluminum foil is thinner

the sheet of composite hose is usually composed of white polyethylene, acid copolymer, aluminum foil, transparent polyethylene, etc. The traditional sheet is very thick, and the aluminum foil is generally 40 μ Or 30 μ。 With the continuous improvement of technology, aluminum foil is getting thinner and thinner, and its proportion in the sheet is also getting smaller and smaller, from 29.44% in 1980 to 12.21% at present. Now the thinnest aluminum foil is only 12 μ。 This makes the barrier layer closer to the content

transparency of sheets

more and more color pastes and gel ointments are being loved by consumers. When these products are packed in transparent composite hoses, their attractive colors and good texture are unforgettable, and transparent hose packaging undoubtedly adds to the icing on the cake. However, when transparent hoses are used, the contents of the tubes are easily degraded by ultraviolet radiation. At present, the company has developed a product formula of "UV barrier", which can effectively protect the filled products from UV damage

environmental protection is valued

maximize?? Using economical and recyclable sheets and reducing raw materials is the most practical and reasonable way to produce environmentally friendly hoses. When the thickness of the aluminum foil barrier layer in the hose is reduced from the traditional 40 μ Reduced to 12 μ It can save a lot of resources; When the aluminum foil barrier layer is completely eliminated and replaced by EVOH (ethylene vinyl alcohol copolymer), the composite pipe can be completely recycled

the development of composite hoses in China

composite hoses in China have developed rapidly, and composite hose manufacturers represented by Shenzhen Petrochemical Lixing and Shanghai Sanying packaging materials Co., Ltd. have emerged. Among them, Shenzhen Petrochemical Lixing has produced 5-layer composite plastic hoses since 1992, which is the first manufacturer of 5-layer composite hoses in China

most of the large-scale composite hose manufacturing enterprises in China have introduced high-speed pipe making machines from KMK and Aisa in Switzerland; Flexographic printing machines and gravure printing machines in the United States, Japan or Taiwan Province; Germany or Italy coextrusion compound machine and dry compound machine; Cutting and slitting machines, bag making machines, film blowing machines and other world-class advanced production equipment from Japan, Italy or Taiwan

cosmetics and drugs are the largest users of composite hoses. At present, they are mainly used in the packaging of some condiments in food. Applications in other fields need to be expanded