With extrusion blow moulding, manufacturers can make a broad range of finished plastic products. Depending on the specific requirements, operators create bottles, jars, tubing, containers, and more in a variety of sizes and shapes. A few examples are water bottles, peanut butter jars, specimen jars, and bottles used to hold cooking oil, shampoo, and milk.
With incredible diversity, one extrusion blow moulding machine can produce products for multiple industries, including technical, medical, food and beverage, and consumer goods, among others. Along with the examples mentioned, experts rely on this process for making large plastic drums, storage tanks, and so on.
Rather than just one extrusion blow moulding process there are two. The first is the continuous or intermittent parison process. With this, the extruder runs continuously although the parison comes from a different source. The second process uses an accumulator. That means that during the process of accumulator head blow moulding, the extruder refills the accumulator as a way of preparing it for the next shot.
Below are five of the steps required to produce an extruded product using the continuous method.
1. The raw plastic material goes into a hopper mounted on the extrusion blow moulding machine. Based on the customer’s requirements, the operator can add additives and colourants at that time.
2. Next, as the plastic beads or pellets leave the hopper, travelling through the feed throat. That part of the extrusion blow moulding process is what dispenses the material into a barrel with a large rotating screw.
3. As this occurs, the barrel heats up to a melting temperature. The heat combined with the rotation yields molten resin that has a gooey consistency similar to bubble gum.
4. Once the now melted plastic reaches the end of the screw, it flows over a screen and a breaker plate. This part of the extrusion blow moulding process accomplishes two goals. First, the screen part removes any inconsistencies or contaminants in the plastic. As for the breaker plate, this actually changes the motion of the plastic, going from rotational to longitudinal. At that point, the material is ready for the die.
5. The die ensures the plastic flows evenly and smoothly as it leaves the cylindrical profile of the extrusion blow moulding machine. Ultimately, the die plays a critical role in achieving the right consistency, which gives the finished product integrity.
Due to the way the extrusion blow moulding process works, top manufacturers can produce stellar products. Even if a customer needs a more complicated part or component, this machine can handle it.
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