Screws, augers

Composite screw

Due to the increasing number of new types of sticky and abrasive materials and where it is not possible to use an axisless spiral due to the necessity of filling with transported material, we use robust plastic screw conveyors RATAJ® (types, RP, RPN) consisting of plastic segments forming screw and piping. These segments can be slid onto the hexagonal shaft in a very simple way and, using locks, create a very robust, non-bearing worm conveyor construction.

These conveyors are also used for demanding applications for conveying abrasive materials. Their main advantage is especially light construction and quiet operation. The plastic auger is several times lighter than a steel spiral and, in combination with the corresponding piping, these conveyors can also be used for applications that require continuous conveyor operation without the conveyed material. It is mainly used in the food industry (sticky and wet materials), in the chemical industry (aggressive substances) and last but not least in heavy industry, energy and construction. For food, the color segments are white and have a food contact certificate for food contact, for the abrasive materials, the color segments are red, and for conveyors intended for use in potentially explosive atmospheres, the color segments are gray.

Conveyor made from

SCREW: TYPE RP- plastic composite

  • segment color red - designed for abrasive materials
  • segment color white - intended for food
  • segment color gray - designed for ATEX hazardous areas



  • steel (according to EN - S 235, S 355)
  • stainless steel (according to ASTM - AISI 304, AISI 316)
  • plastic PP


Depending on the type of material to be conveyed and the particular technological conditions, combinations of materials are also used


Screw outside diameter

Thread pitch


Transport capacity




(cca m3/hod) */1

RP 50


25, 50


0,001 - 0,5

RP 80


40, 80


0,001 - 1,0

RP 100


40, 100


0,01 - 5,0

RP 150


75, 150


0,01 - 15

RP 220


110, 220


3,0 - 50

RP 300


150, 300


5,0 - 100,0


*/ 1 The conveying capacity of individual conveyors depends on the type and physical properties of the conveyed material.

More than 5 900 units of conveyors for nearly 600 kinds of materials in 34 years of market experience guarantee professionalism even for your demand.

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