The operating principle of blow molding machine

Blow molding machine, also called hollow blow molding, is a rapidly developing method of plastic processing. A blow molding machine is a machine that uses the wind blowing from the machine to blow the plastic body to a certain shape of the cavity after spraying the liquid plastic to make the product.

Blow molding machines can be classified into three categories: extrusion blow molding machines, injection blow molding machines and special structure blow molding machines.

Blow molding machine is mainly composed of hydraulic system, extruder,mold clamping system, die head electrical control system, inflation system, automatic clamping and other parts.It is used for blowing PE and other hollow products of various materials. Such as: square barrels, round barrels, beer preservation containers, tool boxes, lampshades, etc. The machine has high performance, low energy consumption and easy operation.

At present, the high-end hollow machine on the market is a newer product developed and developed in combination with my country's national conditions. It selects high-quality hydraulic components, adopts PLC control, and adopts the most advanced FIFO storage head. On the basis of the advantages of traditional hollow aircraft, coupled with today's most advanced technology, its performance is more excellent and reliable. High efficiency and applicability have reached the level of similar products in Japan and Germany.

The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin is placed in the mold while it is still hot (or heated to a softened state). It is closely attached to the inner wall of the mold, and after cooling and demoulding, it is taken out by a manipulator to obtain various hollow products

After more than 20 years of research, blow molding technology has made great progress in both theory and practice. However, combined with relevant information, it is found that the research work of blow molding technology is generally concentrated in a certain period of the molding process. Process-wide analysis Numerical simulations of different process factors are rare. The blow molding process can be roughly refined into three stages: parison molding, parison inflation, and cooling and solidification, and a close correlation is formed between them. The external structural shape and wall thickness distribution of the parison affect the expansion of the parison. The surface profile and wall thickness uniformity have a direct impact: for the parison inflation stage, the compressed air and the product thickness and temperature distribution obtained after inflation will affect the cooling and solidification process of the product, thereby affecting the product performance.Based on the above discussion, it is found that it is of great practical significance to strengthen the systematic numerical simulation of the whole process of blow molding, and to ensure the continuity of the simulation process, and then to more accurately describe the entire process of product molding, and the level of blow molding technology is also will increase accordingly.

In the era of rapid social and economic development, the demand for hollow plastic products in various industries is increasing, and higher requirements are also placed on product quality, and the geometry of additional products is also becoming more and more complicated. In the process of plastic products, it has been stagnant for a long time in the production state of repeated mold trials in the past, so it is difficult to ensure that the production enterprises have a place to stand in the fierce market environment, and even have the risk of being eliminated. Based on the status quo, it is found that the related technologies of hollow blow molding in my country started relatively slowly, but developed rapidly in the later stage. Universities and major enterprises are actively participating in the research process of this technology. Diversity has a positive effect.