The difference between bottle blowing machine and blow molding machine

Generally speaking, a blow molding machine is also a bottle blowing machine! Bottle blowing machines include blow molding machines, hollow molding machines, injection blow molding machines, and the more commonly used two-step bottle blowing machines!

Blow molding machine introduction

Blow molding machine is a kind of plastic processing equipment. After the liquid plastic is ejected, the wind force blown out by the machine is used to blow the plastic blank into a mold cavity of a certain shape to make a product. There are two commonly used plastic blow molding machines: extrusion blow molding machine and injection blow molding machine. The basic principles of the two equipment are basically similar. The resin is first added to the extruder, melted, and blown to obtain the finished product. The difference is that the process of the extrusion blow molding machine is extrusion-stretching-blowing, while the process of the injection blow molding machine is injection-stretching-blowing.

Blow molding machine introduction

As the name implies, a bottle blowing machine is a machine that produces bottles. It softens plastic granules into liquid, and then blows the prepared preform melt into different bottles. Common bottle blowing machines include extrusion blow molding machines, injection blow molding machines, special structure blow molding machines, etc.

The bottle blowing process is also divided into one-step bottle blowing and two-step bottle blowing, among which the two-step bottle blowing method is the most commonly used. The principle is to first preheat and soften the preform with an infrared high-temperature lamp, then put the preheated preform into the mold, inflate it with high pressure, and blow it into the desired shape. The bottle blowing process is a biaxial stretching process. Therefore, in this process, in order to increase the mechanical properties of the bottle wall and improve the tensile strength, tensile strength, and impact strength, the PET molecular chain will be extended and arranged in two directions. This stretching is also limited and cannot be over-stretched. The stretching and blowing ratios need to be controlled.

The price of containers produced by bottle blowing machines is linked to safety, so they are often used in industries such as beverages, medicine, cosmetics, and food processing to replace glass containers.

The difference between blow molding machine and bottle blowing machine

1.Different principles. The working principles of the two mechanical equipment are introduced above. It can be seen that there are certain differences in their production principles. The production process of the blow molding machine is extrusion/injection-stretching-blow molding, while the blow molding machine is a one-step blowing method and a two-step blowing method.

2.The products produced are different. A bottle blowing machine is a machine that blows bottles. Bottle blowing machines are easy to produce and have a large molding volume. They mainly inject tubular blanks into molds to inflate the tube wall into a bottle shape. A blow molding machine needs to melt the plastic in a screw extruder and extrude it quantitatively, and then form a film and cool it to obtain a complete product. It is more used to produce large barrels or irregular blow-molded products, such as warning columns, pallets, floating barrels, etc.

3.The characteristics are different. The blow molding machine has the characteristics of high thickness, corrosion resistance, wear resistance, etc. The die head also adopts a chrome-plated screw mandrel structure, which makes the discharge more uniform and smooth, and better completes the film blowing. The film blowing machine has a complex structure, which makes the output gas more uniform, and the lifting unit also adopts a square frame structure, which can be adjusted according to production needs.