Injection molding and blow molding are two processing technologies for mold products, but their processing technologies are different and have their own characteristics. In short, the injection mold uses the "injection + pressure" mode, and the blow mold uses the "injection + blow" mode. Injection molding is a solid core, while blow molding is a hollow core. In addition, a mold manufactured by an injection molding process has a gate portion, and a mold manufactured by a blow molding process has an uneven surface with a blowout port. The following editor will take you to understand in detail what is an injection mold and what is a blow mold? What is the difference between the two?
1. Injection mold injection is thermoplastic injection molding. The method is to melt the plastic material and then inject it into the film cavity. After the molten plastic enters the mold, it will be cold formed and processed into the desired shape. The final shape is usually the appearance of the final product and does not require other processing. In addition, the injection molding process can well control the details, for example, protrusions, ribs, threads and other parts can be formed in one step of injection molding.
2. Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. The processing principle is as follows. A thermoplastic resin in a heated and softened state or a tubular plastic parison obtained by injection molding is put into a mold, and then compressed air is injected after closing the mold to expand the plastic parison and adhere to the inner wall of the mold. , Then cooled and demolded, and finally get the required hollow product. It is worth mentioning that the manufacturing principle of blown film is very similar in principle to blow molding of hollow products, but its production does not use molds, which is completely different from processing injection molds in this respect. From the perspective of the classification of plastic processing technology, the molding process of blown film is usually included in the extrusion process. According to the manufacturing method of the parison, blow molding can be divided into extrusion blow molding and injection blow molding. Newly developed multilayer blow molding and stretch blow molding.
3.Through the above introduction, the difference between injection mold and blow mold, I believe everyone has a certain understanding of these two processing technologies. In fact, the main difference between injection molds and blow molds lies in the form of product display. Products manufactured through the injection molding process are generally thicker, relatively simple to manufacture, and require relatively low raw materials. The blow molding process is different. The products produced are thinner, more transparent, and slight shortcomings are easy to see.
Therefore, the processing requirements for blow molds are relatively high, and the toughness and stretchability of raw materials have certain requirements. Injection molds and blow molds are widely used in daily life, and each has its own characteristics and advantages. Processing technology is also improving year by year, and has good development prospects in the future.
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