Blow molding process is one of the important processing methods, which can be used for industrial films, bottles, warning posts, plastic barrels, roadblocks, septic tanks, kayaks, double-ring barrels, pallets, solar tanks, mobile toilets, floats, medical The bed head and IBC barrel have a simple forming principle, and the production barrel body can produce square and round shapes.
According to different processes, blow molding can be divided into extrusion blow molding and injection blow molding. The extrusion blow molding process involves the extruder melts and plasticizes the resin to extrude the tubular parison, then the parison is placed in a blow mold, inflated with compressed air, and cooled and shaped to obtain a barrel or a barrel with the same shape as the mold. Bottle body. The process of injection blow molding is to inject molten material into the mold by the injection molding machine to form a tubular parison, then open the mold to leave the parison on the core mold, close the blow mold while it is hot, and blow compressed air to blow the parison. Expand into the shape of the cavity of the mold, cool and release the product to obtain the product. Extrusion blow molding is suitable for a variety of plastics, and can produce large products, mainly barrels; injection blow molding products have uniform wall thickness, suitable for the production of large quantities of small exquisite products, mainly bottles.
2. Common blow molding process
1. Products processed by multi-layer blow molding process are composed of multi-layer raw materials.
2. Stretch blow molding process, a processing method in which the injected bottomed parison is stretched at the softening temperature, and then blown and molded. Stretch blow molding products have good transparency, tensile strength, impact strength, surface hardness, rigidity and air tightness. This method is especially suitable for materials such as pet and pp.
3. Extrusion-stretching-blow molding process, the resin is first melted into a tubular parison by extrusion, and then the bottom of the parison is melted into a bottomed parison, and then the parison is processed to the ideal stretching temperature. Longitudinal stretching and inflation to make hollow bottles. This method is mainly used for processing pp raw materials, and the products are mainly small thin-walled bottles. By using this process, the impact toughness, low temperature strength, transparency, surface gloss and rigidity of the product are improved or improved.
Post time: Nov-29-2021