In the production process of plastic products, blow molding and injection molding are two common processes. What are their characteristics and differences? This article will introduce in detail from the process flow, molding method, application field and other aspects.
process flow
The blow molding process is a process in which heated plastic particles are put into a mold and blown into shape under a certain pressure and temperature. The process mainly includes steps such as preheating, blow molding, cooling, and demoulding.
The injection molding process is to inject heated and molten plastic into the mold, fill the entire mold with a certain pressure, and cool it for a certain period of time. The process mainly includes preparation, injection, cooling, mold opening and other steps.
Forming method
Blow molding is a process in which heated plastic pellets are blown out of shape in a mold. Because it is formed by blowing, the formed product is lighter and has a better appearance and texture.
The molding method of the injection molding process is to inject molten plastic into the mold, pass through the cavity in the mold, make it fill the entire mold, and take it out after cooling and molding. Because it is molded by injection, the product is relatively strong and has a smooth surface.
Application field
The blow molding process is suitable for the manufacture of some simple-shaped, thin-walled, large, medium and small plastic products, such as bottles, jars, basins, oil drums, etc.
The injection molding process is suitable for the manufacture of plastic products with complex shapes, thick walls, and high precision, such as electronic product casings, auto parts, daily necessities, and medical equipment.
Process advantages and disadvantages
The advantage of the blow molding process is that the cost is low, it is easy to realize automatic production, and it can produce plastic products in large quantities; the disadvantage is that the product precision is low, and it is not suitable for products requiring high precision.
The advantages of the injection molding process are high molding precision, good surface quality, and the ability to manufacture large plastic products; the disadvantage is that the production cost is high, and it is not suitable for products that require low cost.
In general, blow molding process and injection molding process have their own advantages and disadvantages, and have different applications in different application fields. Choosing an appropriate process method can better meet market demand and improve product quality and production efficiency.
In addition to blow molding and injection molding processes, there are other production processes for plastic products, such as extrusion molding, compression molding, extrusion molding, etc. These processes have their unique advantages and fields of application, and can be selected according to specific product requirements and production conditions.
In short, it is very important to choose a suitable plastic product production process. In the production process, it is also necessary to pay attention to the selection of plastic materials, temperature control, mold design and other factors to ensure product quality and production efficiency while reducing production costs as much as possible.
