There are two processing technologies for mold products […]
There are two processing technologies for mold products-injection molding and blow molding. They have their own characteristics. Simply put, the blow mold uses the "injection + blow" method, and the injection mold uses the "injection + pressure" method. The injection molding is a solid core. , Blow molding is a hollow core, the injection mold has a gate section, and the surface of the blow molding mold and the air blowing port are uneven.
1. Injection mold
Injection molding is the injection molding process of the material, that is, the plastic material is melted, and then injected into the mold cavity. After the plastic enters the mold, it is cooled and then processed into the required shape. The formed shape is the final appearance of the finished product, and no other processes are required. The processing has been done. In addition, the injection molding process can well control the details. During the injection molding process, protrusions, ribs, threads and other parts can be molded in one step.
2. Blow mold
Blow molding is a fast-developing plastic processing method, also known as hollow blow molding. The processing principle is: Put the thermoplastic resin or tubular plastic blank obtained by injection molding into the mold, and then inject compressed air into the mold after the mold is closed, so that the plastic blank is inflated and approached to the inner wall of the mold, and then the desired material is obtained by cooling and demolding. Hollow products.
It is worth mentioning that, similar to blow molding of hollow products, the manufacturing process of blown film does not use molds in principle, which is completely different from processing injection molding. According to the blank production method, blow molding can be divided into extrusion blow molding and injection blow molding. The new development direction is multilayer blow molding and stretch blow molding.
Third, the difference between blow molding and injection mold
In fact, the main difference lies in the product expression of injection molds and blow molds. The products manufactured by the injection molding process are usually thicker, relatively simple to manufacture, and require relatively low raw materials. The blow molding process is different, and the product is thin and transparent. Because of this, there are certain requirements for the toughness and tensile properties of the raw materials, and the processing requirements for blow molds are relatively high.
Injection molds and blow molds are widely used in daily life, and both have their own advantages and characteristics, and their development prospects are good.