Jan. 21,2020

Inner thread Unscrew function for Extrusion Blow Molding applications

Our customers regularly require Extrusion Blow Molding machines with the capacity to make an inner thread-type neck in their products. Therefore, an unscrew function needs to be added to the blowing unit in order to properly form the threads inside the product's neck.   

How does this unscrew function for extrusion blow molding applications works? 
For this feature to be integrated to the blow pin unit, it must be a bottom blow unit. The Blow Pin will include the neck thread's design, which will be molded into the plastic container during the blowing process, and then after the mold slightly opens, the blow pin will rotate following the threads of the product's neck while slowly moving downwards. This action will allow the inner threads to be perfectly formed during the cycle time.   

What are the plastic blow molding machine applications of this mechanism?  
The most common uses of unscrew function are for 10L to 30L HDPE inner thread Palm Oil jerry can making machine. Being the most popular sizes the 10L round shape jerry can as well as the 20L round shape jerry can, which are very frequently demanded in countries like Kenya, Nigeria, and all around the Africa region.                                                                                                                                      
As a second example of Inner thread Unscrew function for extrusion blow molding applications, is the narrow mouth HDPE plastic drum, which sizes commonly range from 200L to 250L single and double L ring drum. For making these L-ring HDPE drums with 2 necks and inner threads, an Accumulator Die Head Blow Molding machine with bottom blow unit and inner thread unscrew function is needed.  
Visit our YouTube channel to see how this system works in our machines!
18-016 (HDPE Palm oil Jerry can Blow molding machine test in factory)
15-026 (200L Double L-Ring Drum blow molding machine in India ABL-125-L)