Tube Screw Conveyors for Transport of Paper Pulp

Tube screw conveyors manufactured for internal processes in a paper mill.

Why were tube screw conveyors selected?

• Tube screw conveyors can be made completely tight compared to trough screw conveyors in terms of sealing. This is important because the pulp is water-containing
• One of these tube screw conveyors is installed at an angle relative to horizontal. The material is retained within the screw due to the round outer tube
• Tube screw conveyors are simpler to manufacture. There is no need for inspection access, as paper pulp is uncomplicated to transport

Which basic design principles are applied for these tube screw conveyors?

• The gear motor is positioned at the discharge end of the tube screw conveyors
• The core pipe in the screw rotor is made of carbon steel 1.0570, clad with stainless steel plate. In certain applications, this solution is preferred because these pipes are available in lengths exceeding 6,000 mm
• The tube screw conveyors are equipped with supports, making installation at the customer site simple

How did BEMA solve the task for these tube screw conveyors?

• BEMA received interface dimensions for the tube screw conveyors
• Based on these, BEMA designed the tube screw conveyors
• After customer approval, the conveyors were manufactured in the workshop
• After manufacturing, the tube screw conveyors for paper pulp were test run
• After completion of FAT testing, the conveyors were packed and shipped to the end customer

What are tube screw conveyors?

• Tube screw conveyors consist of a screw rotor enclosed in a pipe, unlike trough screw conveyors where the housing is formed from rolled or bent plates
• They are used where there is no requirement to open the housing for access to the screw rotor
• Tube screw conveyors are a more economical solution compared to trough screw conveyors
• They are more limited in functionality in terms of housing design compared to trough screw conveyors

BEMA can assist and advise in the selection of screw conveyor types. We have many years of experience in manufacturing both tube screw conveyors and trough screw conveyors. With our in-house engineering department, we can deliver a complete solution consisting of:

• Complete design
• Manufacturing in our own workshop
• Test run and FAT execution
• Production of packaging for transport
• Preparation of complete documentation, including:
  • Machine drawing including bill of materials
  • EU Declaration of Conformity
  • Datasheets for wear parts

FAQ: Tube Screw Conveyors for Paper Pulp

What are tube screw conveyors used for in the paper industry?

Tube screw conveyors are used for internal transport of water-containing paper pulp in paper mills. They are particularly suitable because they can be made completely sealed, minimizing the risk of leakage and making them ideal for moist materials like pulp.

Why choose tube screw conveyors over trough screw conveyors?

Tube screw conveyors are simpler and more economical to manufacture, and inspection access is not required when the material is easy to handle. The round tube also retains the material, even when the conveyor is inclined. Compared to trough screw conveyors, they are more limited in functionality, but fully sealed and highly reliable.

What design principles are important for tube screw conveyors?

The gear motor is placed at the discharge end for optimal operation, and the screw rotor core pipe is often made of steel clad with stainless steel to achieve long lengths and high durability. The conveyors are supplied with supports to ensure simple and stable installation.

How does BEMA handle design and delivery?

BEMA receives interface dimensions, designs the conveyors, manufactures them in-house and performs FAT testing before delivery. The customer receives complete documentation, including machine drawings, bill of materials and EU Declaration of Conformity. BEMA also provides advisory services based on many years of experience.