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Jiangsu blow molding processing technology

Release time:

2023-05-11

Three-quarters of Jiangsu’s blow-molded products are manufactured via extrusion blow molding. Extrusion is the process of forcing material through a die or mold to produce a finished product. The extrusion blow‑molding process comprises five steps: 1) forming a plastic parison (an extruded hollow plastic tube); 2) closing the mold by sealing the parison opening and clamping the mold, then trimming the parison; 3) blowing compressed air into the cold walls of the mold cavity, adjusting the nozzle opening, and maintaining a specific pressure during cooling; 4) opening the mold and removing the blown part; and 5) trimming the edges to obtain the final product.

　Three-quarters of Jiangsu’s blow-molded products are manufactured via extrusion blow molding. Extrusion is the process of forcing material through a die or mold to produce a finished product.

　　The extrusion blow molding process comprises five steps: 1. Forming the plastic parison (extruding a hollow plastic tube); 2. Closing the die at the parison’s opening, clamping the mold, and cutting off the parison; 3. Blowing compressed air into the cavity of the mold, adjusting the nozzle opening, and maintaining a specified pressure during cooling; 4. Opening the mold and removing the blown‑out part; 5. Trimming the edges to obtain the final product.

　　Polymer blending equipment is defined as the process of upgrading polymers or polymer systems through melt blending. The blending spectrum ranges from the addition of a single additive to the processing of multiple additives, polymer alloys, and reactive blend formulations, covering an extremely broad scale. It is estimated that one-third of polymer production in the United States is carried out via blending. Component formulations can be tailored to meet the functional requirements of the final application. Blended products exhibit enhanced properties such as high gloss and superior impact strength, or excellent moldability combined with outstanding rigidity.

　　Blended polymers are typically pelletized for further processing. However, blow‑molding processors in Jiangsu are increasingly interested in integrating blending with subsequent operations—such as profile extrusion—to avoid reheating the polymer.

　　Extrusion in Jiangsu Blow Molding Processing

　　Polymer blending is defined as the process of fractionating polymers or polymer systems through melt mixing. The scope of blending ranges widely, from the addition of a single additive to the processing of multiple additives, as well as the preparation of polymer alloys and reactive blends. It is estimated that in the United States, one-third of all polymer production requires blending. Blends can be tailored to meet the performance requirements of the end application. Blended products exhibit enhanced properties, such as high gloss and excellent impact resistance, or precise molding and good stiffness.

　　Blended polymers are typically pelletized for further processing. However, there is growing industrial interest in integrating blending with the subsequent process—such as profile extrusion—to avoid reheating the polymer.

　　Blow Molding Processing in Jiangsu: Blending

　　Various types of melt‑mixing equipment have been employed, ranging from roll mills and batch mixers to single‑screw and twin‑screw extruders. Continuous dispensing (extrusion) is the most widely used method, as it ensures consistent product quality and reduces operating costs. There are two main types of blends: distributive blends can achieve uniform distribution without requiring high shear stresses; such blends are referred to as extensional mixing or laminar flow mixing.

　　Hybrid hollow blow molding processing

　　People use various types of melt‑mixing equipment, ranging from roll mills and batch mixers to single‑screw and twin‑screw extruders. Continuous compounding (extrusion) is the most widely employed method, as it delivers products with consistent quality while reducing operating costs. There are two primary mixing modes: in dispersive mixing, components are uniformly distributed without high shear stresses; this type of mixing is referred to as extensional mixing or laminar flow mixing.

　　Dispersive mixing systems, also known as high‑shear mixing in plastic blow‑molding processing, employ intense shear stresses to break up cohesive solid agglomerates. For example, when additive agglomerates are disrupted, the effective particle size decreases.