Blow molding materials

Kunshan blow molding process adopts a variety of technologies and materials, mainly including the following:

Polyethylene (PE) Polyethylene is the most productive variety in the plastics industry. Polyethylene is an opaque or translucent, light-weight crystalline plastic with excellent low temperature resistance (minimum operating temperature can reach -70 ~ -100℃), good electrical insulation and chemical stability, and can withstand most acids and alkalis corrosion, but not heat resistant. Polyethylene is suitable for processing by injection molding, blow molding, extrusion molding and other methods. PE can be divided into: low density polyethylene LDPE; high density polyethylene HDPE; linear low-density polyethylene LLDPE.

Polypropylene (PP) Polypropylene is a thermoplastic obtained by the polymerization of propylene. It is usually colorless, translucent solid, odorless and non-toxic, with a density of 0.90 ~ 0.919 g/cm. It is the lightest general-purpose plastic with outstanding advantages. It has the characteristics of resistance to cooking in water, corrosion resistance, strength, rigidity and transparency are better than polyethylene, the disadvantage is poor low temperature impact resistance, easy to age, but can be improved by modification and addition of additives. There are three production methods of polypropylene: slurry method, liquid bulk method and gas phase method.

Polyvinyl Chloride (PVC) Polyvinyl chloride is a plastic obtained by polymerizing vinyl chloride, and its hardness can be greatly changed by adding plasticizers. Its hard products and even soft products have a wide range of uses. The production methods of polyvinyl chloride include suspension polymerization, emulsion polymerization and bulk polymerization, with suspension polymerization as the main method.

Polystyrene (PS) General-purpose polystyrene is a polymer of styrene, which is transparent in appearance, but has the disadvantage of being brittle. Therefore, impact-resistant polystyrene (HTPS) can be made by adding polybutadiene. The main production methods of polystyrene are bulk polymerization, suspension polymerization and solution polymerization.

Blow molding materials

Blowing pressure:
To produce general ABS resin blow molding products, the blowing pressure is usually 0.4-0.6MPA. For ABS used for engineering plastics, such as heat-resistant ABS, PC/ABS alloy, its fluidity is poor, and the blowing pressure generally reaches more than 1MPA. For products with fine patterns on the surface, if the pattern is required to be clear, the blowing pressure should also be increased. For products with high surface requirements, such as blow-molded car tail wings, which require subsequent paint treatment, the products are required to be close to the mold in order to replicate the polished mold surface during blow-molding, and the blowing pressure is often required to reach 1.5-2.0MPA. Shanghai blow molding products have a larger area, the more complex the products, and the thinner the wall thickness, the higher the blowing pressure, and vice versa. Higher blowing pressures also result in higher surface finish and dimensional stability. On the practical surface, using a higher blowing pressure, the process adjustment will be easier, and it is easy to obtain products with higher surface quality.

Kunshan Zhida Plastic Products Co., Ltd. is a manufacturer dedicated to the development and production of blow molding products. The company sells various blow molding products all year round. The company looks forward to the new and old customers coming to consult and purchase with high-quality service.

Post time: Jun-20-2023