Mitigating degradation with resin coated sand

Learn how we used our materials knowledge to incorporate a dense phase pressure conveying system in a foundry application.


  • Gamma is owned by Victaulic. They manufacture the cast components for most of Victaulic’s product line, in addition to other customers. (Production ranges from single to multiple piece runs.)
  • They had experienced poor results and numerous maintenance problems with pneumatic conveying and did not believe it to be reliable.


  • The customer has multiple sand hoppers that need to be kept full of resin coated sand. The sand from these hoppers discharge to the customer’s core making machines.
  • Prior to the Nol-Tec conveying system being installed, the sand hoppers were filled using a fork lift truck to maneuver the bag into position then the operator opened the bag to fill the hopper. The core making room is small which made this a difficult, dangerous and messy operation.
  • The sand is resin coated and, if not handled properly, the resin coating can be removed resulting in poor cores.


  • Material is still received in bags and an overhead hoist is used to lift the bags into place. A support platform with access ladder allows the operator to obtain safe access to the bag and discharge the contents.
  • A transporter is located in a pit directly below the hopper. This gives the maximum capacity for the surge hopper, which contains approximately one day’s supply of material.
  • To prevent damage to the material during conveying, Nol-Tec designed this system to operate using our Non-Purge conveying concept.


  • The result is a reliable and safe method for conveying and loading the material use hoppers with good usable product in a minimum of space.
  • A new customer with a changed perception of pneumatic conveying.
Pressure Conveying Resin Coated Sand (PDF)