Composite hose is a special packaging container, which occupies an important position in the packaging field. The so-called composite hose is "a cylindrical packaging container made of flexible materials, which is folded and welded to form a barrel and one end is equipped with a nozzle. After extrusion, the contents are extruded from the nozzle". Definitions given in the Packaging Standard "General Terms for Packaging".

 Since the French made the first paint hose with tin in 1840, tin-coated lead pipes appeared during the First World War, and aluminum pipes appeared in 1948, but metal pipes have the disadvantages of heavy weight and corrosion resistance , The plastic hoses that have appeared recently can overcome the above two shortcomings and have made great progress. In 1950, Switzerland invented the plastic hose made of LDPE. A single plastic hose has limited barrier properties and low strength. In the 1960s, composite hoses appeared in the world, which combined the characteristics of metal and plastic, and can be widely used in the packaging of cosmetics, cleaning agents, toothpaste, silicone oil, grease, etc.

 The composite hose is composed of plastic, paper and aluminum foil. The plastics used for the hose are LDPE and PP, which are used for outer printing, lamination and inner heat sealing. In PE and PP, add O. 5% ethylene glycol amines can be made into dust-proof films, and coating-grade LDPE and EVA can be used as adhesives for extrusion coating compounding between paper and aluminum. If it is an all-plastic hose, in order to have good barrier properties, there should be PVDC, EVAL, nylon or PET materials with high barrier properties in the plastic intermediate layer. In order to prevent penetration, the paper in the composite soft tank tube needs to be impregnated or coated with phenolic resin or melamine formaldehyde resin. Since melamine formaldehyde easily penetrates oil, urea-formaldehyde resin can be used when packing oily paste. In the tube, there is a certain strength and rigidity. Aluminum foil has good barrier properties, excellent light protection and good gloss.

 Example one:

 American Can Company (ACC) produces CS1O04 9-layer composite hose, which consists of 9 layers of PE, paper, aluminum foil and strong adhesive EAA. It is suitable for packaging toothpaste, shoe polish and other oily pastes and slurries.

 production process:

 (1) Coat 51um thick white PE printing film on the phenolic-impregnated paper first, as the material for printing the trademark:

 (2) Printing on a six-color gravure printing machine

 (3) On the printing surface, compound a layer of PE film with antistatic effect by extrusion compounding method or hot melt compounding or dry compounding method, you can use adding O. LDPE particles of 5% diethanolamine, the temperature should not be too high:

 (4) Hot-melt composite aluminum foil and paper with EAA adhesive, and then composite an inner protective layer to form an anti-static PE film.

 Structure: 20umPE/18um white material/PE51um/paper 46um/PE1 8um/EAA84um/aluminum foil 18um/EAA51um/PE3Oum, a total of 9 layers, with a total thickness of 336um.

 Example two:

 The composite hose NR4313 produced by Swiss AlSA company has 5 layers, there is no paper in the 5 layers, using strong adhesive EAA and Surlyn resin, its structure is as follows: Transparent PE film (for reverse printing) 9Oum/EAA (white material) 70g/m2 /Aluminum foil 40um/SurIyn 40g/m2/PE7Oum inner layer, a total of 5 layers, total thickness 31Oum±1%.

 After the composite hose material is produced, it needs to go through the reel, the head (including the screw cap), and then fill and weld the tail to make the product.

 The domestic Shanghai Sanying Company produces the largest composite hose, and its structure is as follows: PE film 9Oum/Nucrel 7Oum/Aluminum foil 4Oum/NucreI 5Oum/PE film 7Oum, mainly used for packaging toothpaste and cosmetics, such as lipstick.

 The structure of the composite hose of another Shanghai company that packs Heimei toothpaste is as follows: anti-static PE film 20um/PE 38um/PE white material 65um/paper 48um/PE53um/aluminum foil 15um/Surlyn62um/inner PE film 52um , a total of 8 layers, 333um thick, the production of composite hose can use extrusion coating machine and co-extrusion composite machine, can also use dry composite method. Recently, some people use composite hoses to package children's food and nutritional products, and the sales are relatively good.

 Reprinted from "Guangdong Packaging"