Blow molding and injection molding are two injection mold processing techniques for mold products. Although there is only one word difference between blow molding and injection molding, they are two methods of forming plastic products, and the conditions for processing and processing materials are also different. So do you know the difference between injection mold processing and blow mold processing?
Let me first introduce the concept of blow molding mold processing. Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin, the plastic parison is heated to a softened state, placed in a split mold, and compressed air is passed into the parison immediately after the mold is closed to inflate the plastic parison and close to the inner wall of the mold, after cooling and demoulding, various hollow products can be obtained.
The manufacturing process of blown film is very similar to blow molding of hollow products in principle, but it does not use molds, which is completely different from processing injection molds. From the perspective of plastic processing technology classification, the molding process of blown film is usually included in extrusion. from. However, according to the parison production method, blow molding can be mainly divided into extrusion blow molding and injection blow molding, and the newly developed ones are multi-layer blow molding and stretch blow molding.
Injection mold processing concept, that is, thermoplastic injection molding, this method is to melt the plastic material and then inject it into the film cavity. Once the molten plastic enters the mold, it is cooled and molded into the desired shape according to the cavity. The resulting shape is often the final product and requires no further processing before installation or use as a final product. Moreover, in the mold processing of injection molded products, many details, such as protrusions, ribs, and threads, can be formed in one step of injection molding.
The concept between the two has been understood above. In fact, the main difference between blow molding mold processing and custom injection moulding is the difference in product. Blow molding processing uses gas to form products, and injection molding products are generally processed to make thicker products. Blow molding is different, because the product is thinner and more transparent, and a slight defect is obvious. Therefore, the requirements are relatively high, and blow molding has some requirements on the toughness and stretchability of raw materials. The products of processing injection molds are thicker, relatively speaking, the requirements are lower, and the requirements for raw materials are also lower.