Development of injection molding plastic barrels and attention

- May 30, 2019-

Plastic barrels should be arranged in a well-ventilated and well-ventilated chamber. If it is in the high temperature season, it is best to arrange the barrels under the special sheds with four sides to avoid the excessive temperature affecting the growth of unicellular algae. Before the operation, the hand should be washed, and wiped and disinfected with alcohol cotton. The scoop and the scoop of the culture solution and the measuring cylinder or measuring cup with the nutrient salt, the gauze and the nylon film and the inflation tube of the lid mouth must be removed. Use after boiling and disinfection. The expansion culture is prepared by purifying and filtering the seawater by boiling, cooling and adding nutrient salts. Continuously inflated during the day, stopped at night, and does not inflate at noon during the hot season. Plastic drums should be numbered and marked with the date of expansion so that the plastic bucket tertiary tank can be inoculated in the order of expansion. Bottle-to-barrel, barrel-to-barrel, and barrel-to-tank are continuous inoculation processes. Algae species must be pure and in exponential growth phase, and contaminated aging algae species cannot be used for inoculation.

The material of the plastic barrel is mostly blow molded and injection molded from plastics such as polyethylene and polypropylene. What is the main material high-density polyethylene for making plastic barrels? Let's take a look:

The blow molding grade hollow plastic container is made of low-pressure high-density polyethylene, that is, HDPE, high-density polyethylene (HighDensity Polyethylene, referred to as "HDPE"), which is a high-crystallinity, non-polar thermoplastic resin. The original HDPE has a milky white appearance and a semi-transparent shape in a thin section. PE has excellent resistance to most of the characteristics of living and industrial chemicals. Certain types of chemicals can cause chemical corrosion, such as corrosive oxidants (concentrated nitric acid), aromatic hydrocarbons (xylene), and halogenated hydrocarbons (carbon tetrachloride). The polymer is non-hygroscopic and has good water vapor resistance and can be used for packaging purposes. HDPE has excellent electrical properties, especially high dielectric strength, making it suitable for wire and cable. Medium to high molecular weight grades have excellent impact resistance, both at ambient temperatures and even at low temperatures of -40F.

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