Views: 0 Author: Site Editor Publish Time: 2022-07-19 Origin: Site
HDPE bottle is a high density polyethylene plastic product that deforms in a high temperature environment, and the bottles of detergent or shampoo that we usually use in life are actually made of this material.
What are the production processes of HDPE bottles?
What are the chemical properties of HDPE bottles?
What are the physical properties of HDPE bottles?
The molding process of HDPE bottlemainly includes blow molding and injection blow molding, and extrusion blow molding equipment and processes are relatively simple. The HDPE bottle mouth obtained by the above method and its thread have high dimensional accuracy, stable outer dimensions of the bottle body and a more accurate match between the bottle cap and the bottle mouth, which is advantageous for improving the sealing performance HDPE bottle. Therefore, injection blow molding medical plastic bottles are generally welcomed by the pharmaceutical industry.Although the cost of injection blow molding is high, the quality of manufactured products is high, the degree of automation is high, and the production efficiency is also higher. Most of the medical HDPE bottles currently manufactured are manufactured by injection blow molding and meet the relevant standards.
The general melting point of HDPE is 142 °C and the decomposition temperature 300 °C; the adjustable range of injection temperature is large. In injection molding, the general use temperature is 180 ℃230 ℃; Since it is an olefin plastic, it does not absorb water and does not need to be dried during production. However, for product quality, it can be dried for 1-hour at 60°C to drain floating water. Ethylene has a high melt viscosity and a small flow length ratio, and thin-walled products may lack glue. Therefore, goals and runners are relatively large; Products are susceptible to static electricity, and the surface easily absorbs angstrom. The overflow value is 0.05 mm.
HDPE bottles are mainly used for packaging oral solid preparations, capsules, tablets and other medicines. As pharmaceutical packaging, HDPE bottles are the most important. According to the different markets for HDPE bottles, two different test methods can be selected: YBB standard and USP standard. The relative production process control and raw material control will be different.
High density polyethylene used in HDPE bottles has good heat and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. The dielectric properties and resistance to voltage cracks in the environment are also good. hardness, tensile strength and creep are better than low density polyethylene; Wear resistance, electrical insulation, toughness and cold resistance are better, but slightly worse than low density insulation.
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