Cadmium is a potentially harmful environmental pollutant. Japan's "pain" is caused by long-term consumption of cadmium-containing rice. According to statistics, there are about 10,000 ha in China, and the land is polluted by cadmium. The annual production of cadmium is more than 50,000 tons, and the loss of grain due to pollution is about 12 million tons, which seriously affects China's food production and food. Safety. Cadmium is the most exchangeable in soil, the most effective for plants, the most active, and the most toxic, so the treatment and repair of soil cadmium pollution is imminent.
Overmolding is a type of Injection Molding process that combines multiple materials into a singular part or product. Overmolding can be used to combine similar materials of a different color, or to combine materials for functional purposes, such as giving a product a soft grip.
Overmolding Process Selection
Overmolding materials
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Currently, treatment of soil contaminated heavy metals way of two ways: one is to remove contaminants, i.e. decontaminated; the other is to change the form of the presence of heavy metals in the soil, to secure it, will reduce the activity of pollutants, Reduce migration and bioavailability in soil, ie stabilization. Different treatment measures and methods have been developed around these two approaches, such as the guest soil method, the leaching method, the electric repair method, the antagonistic ion method, the improver method, and the phytoremediation method.
Zero-valent iron (waste iron scrap) is an active material of permeable reactive barrier (PRB) technology. It has been used abroad to remove chromium and trichloroethylene (TCE) pollution from groundwater. China also uses zero-valent iron. Removal of wastewater from printing and dyeing industry. It has been reported that iron oxide can effectively repair arsenic- contaminated soil. However, there are few studies on the use of zero-valent iron (waste iron filings) to repair heavy metal pollution in soil. The repair of cadmium has not been reported. The scrap iron scrap is taken from the factory waste, and the raw materials are cheap and easy to obtain. The PRB technology removal process is used for in situ repair, which saves many processes and has a short repair cycle and has great application potential. The author has done some basic research on the repair of cadmium-contaminated soil by scrap iron filings, and provides technical basis for the promotion and application of PRB technology.
The decision which of the possible processes and mold design to select depends on:
Materials selected
Production quantities required
Methods available at the production location
Capital available for tooling
Local labor cost
Overmolding Plastic on Metal
When overmolding plastic on metal, the durable plastic is molded over the metal component. Overmolding plastic on metal is often used in manufacturing plastic handles on metal tools and in the medical, aerospace, and consumer goods industries.
Overmolding Plastic on Plastic
When overmolding plastic on plastic, the more rigid plastic component is first molded, and then the more durable plastic material is molded over the previous plastic part. This process is often used to create handheld devices, soft grips for consumer products, and a wide range of medical devices.
Waste iron filings repair soil cadmium pollution