Fighting Angel Hair in Your Material?

By:Kevin Cradduck on octubre 27, 2017

Is the distribution box on your Silo getting clogged with angel hair? Are you constantly cleaning the cone/screen and distribution box on your dryer hoppers. Do you clean angel hair off of the Augers in your material / color blenders.

If so, take a few minutes to read this article.

Angel hair as it is called, or sometimes better known as stringers in your material. These stringers are a result of individual material pellets melting when they come in contact with a surface. The pellet is getting drawn through a pipe with air. The high velocity of the air moving the pellet through the pipe comes in contact with a surface and skids while it melts from friction which causes a long hair like string of plastic. That stringer continues down the pipe until it ends up in the silo, day bin, dryer hopper, color blender or molding machine. Over a period of time these stringers will collect into a nasty hair like ball. These hairballs which can clog up your distribution box at the bottom your silo causing a material shortage at the molding machine creating scrap and down time.

Let us back up to the beginning for a minute.  What to look for if the stringers are in your silo. When the material was pumped into your silo from the semi-truck load you just received. Did you monitor the rate, pressure, and velocity when the silo was filled with material? The pressure should be around 5 but no more than 5 on their gauge. Some say 7 but I always tried to keep them at 5, just to be on the safe side. Obviously, this depends on what the material is. This number is for an unfilled Polypropylene.  A couple of solutions for this is have your receiving employee monitor the delivery; another is to install a separate pump to regulate the pressure and velocity.

If you are having, issues with stringers further downstream in your delivery system. You should make sure that your Vacuum pump is rated for your delivery pipe size.  Make sure you do not have 90° Elbows installed in your delivery pipe. These 90-degree angles can contribute to additional stringers. In addition, the delivery pipe needs to be beaded pipe on the interior of the delivery pipe. This will keep material pellets from skidding down the wall of the delivery pipe.

If you would like more information on how to improve efficiency, reduce wasted resin, minimize scrap after color and material changes in your facility, contact me.


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