How many production processes are there for extrusion blow molding machines?
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, desktop panels, Floats, medical bed heads, IBC barrels, the forming principle is simple, and the production barrels can be produced in square and round shapes.
I Extrusion Blow Molding Machine Process
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 melting and plasticizing 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 that the injection molding machine injects the molten material into the mold to form a tubular parison, then the mold is opened to leave the parison on the core mold, the blow mold is closed while it is hot, and compressed air is blown 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-scale products, mainly barrels; injection blow-molded products have uniform wall thickness, suitable for the production of large-scale, small-scale exquisite products, mainly bottles.
II Common blow molding process
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.
