Injection molding and blow molding processes

　　Injection molding and blow molding are two common plastic processing methods, with many differences in their principles and processes.

　　1. Process principle:

　　The principle of injection molding process is to heat plastic to a liquid state and then inject it into the mold, forming the desired shape and size in the mold. Injection molding process is usually suitable for producing plastic products with various shapes and high complexity.

　　The principle of blow molding process is to melt plastic particles first, and then blow out bubbles through a machine. After appropriate pressure and shape limitations, the bubbles become the desired shape and size. The blow molding process is usually suitable for producing hollow plastic products such as thin-walled containers, bottles, barrels, etc.

　　2. Process flow:

　　The process flow of injection molding process includes several steps, including raw material treatment, mold manufacturing, injection molding process, cooling and demolding, subsequent processing and inspection. During the injection molding process, it is necessary to achieve the desired shape and size by pressing the plastic into the mold under specific temperature, pressure, and speed conditions.

　　The process flow of blow molding generally includes several steps such as raw material treatment, extrusion, blow molding, cooling, and hair removal. During the blow molding process, the plastic inside the heater is first melted and extruded into a cylindrical shape by an extruder. It is then blown into shape and cooled and depilated after molding.

　　3. Scope of application:

　　The injection molding process is suitable for manufacturing large and complex plastic products. It can achieve one-time molding with high accuracy in shape and size, and is widely used in industries such as electronics, automobiles, and medical devices.

　　The blow molding process is suitable for manufacturing hollow shaped plastic products. It can produce various shapes and sizes of plastic bottles, barrels, containers, etc., and is widely used in industries such as chemical, light industry, food and beverage.

　　4. Equipment differences:

　　Injection molding equipment usually includes injection molding machines, molds, and related auxiliary equipment, such as automatic feeding machines, conveyor belts, raw material heaters, etc.

　　Blow molding equipment usually includes a weight suction molding machine, blow molding machine, and related auxiliary equipment, such as extruder, mold, cooling, and hair removal equipment.

　　In summary, there are significant differences in the principles, process flow, scope of application, and equipment between injection molding and blow molding processes. When selecting plastic processing methods, it is necessary to determine which processing method to choose based on production needs and requirements.