Blow molding products factory extrusion blow molding processing technology


Author: MULAN -Plastic Molding Manufacturer

There are many types of hollow blow molding design products, and it is difficult for blow molding product factories to form a unified quality standard when implementing operations. 1. Process 1) Heat the thermoplastic resin with the help of an extruder, and extrude the molten tubular parison under a certain temperature and pressure. 2) Place the molten tubular parison in a mold of a certain shape, and close the mold for processing and transformation. 3) The product in the mold will be cooled and shaped under a certain pressure. After the mold is quickly closed, the blow valve nozzle is inserted immediately, and a certain pressure is put in it to compress the air. 4) Allow the product in the mold to complete cooling and shaping under the action of pressure. 2. Molding process control To produce a good-quality hollow blow-molded product, the blow-molded product factory must not only process and manufacture it according to the standard standards, but also need to comprehensively consider the interaction between various factors. 1) Resin selection Thermoplastic resins for hollow blow molding, such as lower density polyethylene and higher density polyethylene. Among these resins, polyethylene resin is widely used, which is especially suitable for the production of small-scale product blow molding. When the blow molding factory chooses the resin, it should consider the molding performance, processing fluidity and sensitivity of the resin. Molding with good fluidity will be easier. 2) Temperature control In the process of blow molding operation, the blow molding product factory should focus on strengthening the temperature control of each link. Strengthen the control of barrel temperature. Strictly control the dissolution and processing temperature of various materials, for example, the processing temperature of polyethylene needs to be controlled at Between 160 ~ 190 ℃. Strengthen the control of the temperature of the head and the die, which directly affects the quality of the extruded molten parison. Strengthen the control of molding mold temperature. The internal temperature of the forming mold should be kept in the same state as the temperature of each department in the cavity, and local overheating or overcooling cannot occur. When the mold temperature is high, the surface temperature and gloss of the blown product are good, and the blown part will become thinner. Enhanced control over extrusion speed and parison. The extrusion speed is closely related to the heating temperature of the barrel and head. During the operation, it is necessary to ensure that the extruded parison is smooth, and it is also necessary to ensure that the extruded parison will not bear more load. In summary, the hollow blow molding process design of the blow molding product factory should consider good compression and impact resistance, and at the same time, the wall thickness of the blow molding product should be kept uniform, and the phenomenon of uneven thickness should not occur. Product quality defects may occur during the hollow blow molding operation, and these defects will affect product production. During the specific implementation of the operation, the relevant personnel of the blow molding product factory need to take effective measures to control it. Graphics and texts are for learning reference, for more industry information, please pay attention to Ningbo Proficient Proficient in Mold | Blow Molding Products Factory | Started in 1998, trustworthy.

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