Conditions affecting blow molded products

Release date： 2018-01-23 Author： Click：

1. Products produced by hollow blow molding machines require uniform wall thickness.

2. Generally, the hollow container below 0.2L may not have the parison wall thickness control device. In other cases, the use of the parison wall thickness control device should be considered, especially for hollow molded products with complex cross-sections.

3. At present, the wall thickness control is usually achieved by changing the die lip gap between the die cover and the die core. Depending on the shape of the head cover and the core, the adjustment method of the lip gap is also different.

4. The up and down movement of the mold core is generally driven by a hydraulic cylinder.

5. When the hollow blow molding machine processes plastic hollow containers with simple shapes, it can be realized by a switch-type hydraulic system.

6. The electro-hydraulic reversing valve only accepts power-on or power-off signals, so that the hydraulic cylinder moves up or down, and the distance the hydraulic cylinder moves (that is, the change of the opening of the die) is set by the upper and lower limit nuts. The speed is set by the throttling action of the flow valve, and the electrical signal of the electro-hydraulic reversing valve is controlled by a time relay.

7. This control method is simple and cheap, but the wall thickness variation is simple, there are only two wall thickness variations, and it can only be used for hollow containers with simple shapes.

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