Industrial Screw Conveyors and Feeders NPT

Abrasive Materials

Abrasive materials can cause excessive wear to the trough and conveyor components. They should be conveyed at slower speeds and with less loading on the trough. For very abrasive materials, it may be necessary to use thicker screws and troughs, surface hardeners, or special alloy components.

Chemical raw materials

Chemicals and food additives, require sealed end bearings and nylon or other dry running suspension bearings. Trough covers are sealed, closed and easily removed for frequent cleaning. Internal welds in contact with the raw material may require polishing to eliminate material retention.

Degradable materials

Materials that tend to fall apart or separate should be conveyed in large diameter conveyors at very slow speeds to minimize physical shock to the material.

Extreme temperatures - cooling jacket

Conveyors handling materials at extreme temperatures should be constructed of metal alloys designed to operate under these conditions. Highly corrosive materials combined with high temperatures require special consideration in alloy selection to maximize component life. It may be advisable to use jacketed troughs, in which a heating or cooling medium can be circulated to maintain the conveyed material at safe operating temperatures. Conveyors handling hot materials also experience thermal expansion and will increase in length as the trough and screw temperatures increase after the hot material begins to be conveyed.

Materials creating explosive atmospheres EX

The conveyor must be designed with non-sparking and explosion-proof components and must be sealed. An exhaust system for ventilation may be necessary if hazardous dust is present.

Swelling materials

When conveying materials that tend to aerate and swell, the size and speed of the conveyor must be designed based on this larger swelled volume and density. Such materials will often pass through the gaps around the screws. In these types of screw conveyors, low speeds, small gaps, and special screw edges must be used.

Hygroscopic Materials

Hygroscopic materials readily absorb moisture and tend to become denser and more difficult to flow. Sealed conveyors that exclude the outside atmosphere are effective in handling these materials.

Mixing During Transport

When mixing of base material with additives is required, a conveyor consisting of screw ribbons, cut and folded screws, cut feathers or blades can be used, individually or in any combination to achieve the desired effect.

Moving at an angle

Inclined screw conveyors have a higher power requirement and lower efficiency than horizontal conveyors. The level of power increase and actual efficiency depends on the angle of inclination and the properties of the conveyed material.

Sticky or Sticky Materials

For these types of raw materials we use ribbon conveyors to minimize material build-up.