Numerous products are made from blow molding. Any consumer item that has a three-dimensional shape and is hollow, such as tanks and CD cases, is manufactured using the blow molding process. Blow molded products are capable of holding a variety of substances such as herbicides, pesticides, cosmetics, and automotive oil. The plastic utilized for these processes are all thermoplastic resins. They include acetal, polysulfone, polyamide, polystyrene, butadiene styrene, Barex, polyvinyl chrloride (PVC), and high and low density polycarbonate.
Plastic blow molding can be categorized into three types: injection blow molding, extrusion blow molding, and stretch blow molding. All of these processes consist of two steps, which vary the most in the early stages. The ultimate shape of the blow molded plastic depends on the shape of the mold cavity. While blow molded products come in an assortment of standard shapes and sizes, there are some products that can be made using custom blow molding, and are thus used for special applications.
The blow molding process is implemented in order to form a smooth, airtight, uniform product that does not need to be assembled together. The first step in the blow molding process involves melting the plastic, and then using injection molding to form it into a preform, or parison. A parison is a piece of plastic shaped like a tube with a hole on one end which allows compressed air to pass through. The preform, which is soft and moldable, is pushed by a metal ram and expanded to the designated height of the product.
Air pressure is introduced to the inside of the parison via a blow pin. The air pressure causes the parison to expand like a balloon and fully take the shape of the mold cavity. The final product can be cooled either by running cold water through the mold, by conduction, or by evaporating inconsistent fluids within the container. The blow molding process merely takes a few seconds; thus, blow molding machines are capable of producing up to 20,000 containers in an hour. There are three methods in which blow molded plastic can be produced: extrusion, injection, and stretch blow molding. Read More…
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