HDPE bottle injection blow molding characteristics

March 31, 2022

1. The plastic melt is injected into the parison mold, and it undergoes a certain orientation effect in the circumferential direction of the cavity. In addition, the temperature of the parison during inflation is lower than that of extrusion blow molding, and the orientation effect produced by the inflation can be more retained, which helps to improve the strength and other properties of the HDPE bottle.

2. The HDPE bottle has high dimensional accuracy, and it is easier to ensure the uniformity of the wall thickness of the bottle body according to the requirements, and the bottle body specification is uniform.

3. There is no joint seam formed on the surface of the bottle body, and no trimming after molding is required. Generally, there is no leftover material. The leftover material produced by extrusion blow molding is usually 5%-30%.

4. The gloss of the bottle body is high, and the transparency of the bottle body formed by transparent polymer is obvious.

5. A movable bottom module can be set on the Blow Mold, so the bottom shape of the bottle is more flexible. It is more suitable for forming rigid plastic bottles and wide-mouth plastic bottles.

6. Injection blow molding requires two molds: parison mold and blow mold, and the mold requirements are high, so the cost of injection blow molding is higher, which is about 2-3 times that of extrusion blow molding. Due to the higher pressure of the melt in the mold cavity of the parison, the residual stress of the blow-molded bottle body is higher, and the mold force required by the parison mold is high. Most of the bottle bodies with smaller solvents are injection-blow molding, and products with complex shapes cannot be formed, and the energy consumption is significantly higher.

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