3. Operability
In order to facilitate printing and packaging operations and adapt to mechanized operations, plastic hoses for cosmetic packaging should have good printability, heat-sealing performance and packaging machine suitability.
(1) Printing suitability. From a printing point of view, aluminum-plastic and all-plastic composite hoses have advantages over plastic co-extruded hoses. Because the aluminum-plastic and all-plastic composite hoses are made of different materials through the extrusion process first, the tubes are made after the slitting and printing processes, or the printed film is extruded and slitted. Then the tube is made; while the plastic co-extrusion hose is first made of the tube and then printed, which will inevitably lead to the complexity of the printing process.
(2) Heat sealing performance. The heat sealing performance includes two indicators: the sealing temperature and the heat sealing strength. Especially for some temperature-sensitive cosmetics, it is required that the temperature of the tube tail welding and sealing should not be too high. At this time, some low-temperature heat-sealing materials can be used for the heat cover to ensure the welding and sealing under low temperature conditions that do not affect the quality of cosmetics. When filling cosmetics, the contents may contaminate the seal, and plastic hoses made of general materials cannot seal well, but if the heat cover is made of anti-pollution materials, this problem can be effectively solved.
4. Economical
Among the aluminum-plastic composite hoses, the unit price of aluminum foil is the highest, and controlling the thickness of the aluminum foil can effectively control the cost of the hose. Therefore, under the premise of ensuring good product performance, using thinner aluminum foil, reducing losses in the production process, and using simplified packaging as much as possible can reduce the cost of aluminum-plastic composite hoses.
At present, the cost of all-plastic composite hoses is relatively high. On the premise of not affecting various properties, reducing the thickness is also one of its future development directions. As a result, high stiffness materials (such as PP, etc.) will be increasingly used in all-plastic composite hoses.
To reduce the cost of printing plastic co-extruded hoses and take advantage of its appearance (no edge seals), a new hose construction has been developed. The structure is to cover the printed composite hose with a transparent plastic co-extrusion hose through a special process, so that the printed pattern inside is clearly presented to consumers, while maintaining the excellent quality of the plastic co-extrusion hose feel.
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