Name: Screw Conveyor
Brand: CYprocess
Availability: InStock

Question 1

What is the difference between U-trough and tubular screw conveyors?

Accepted Answer

Tubular screws fully enclose the product, which suits free-flowing dry powders and small granules and keeps dust and moisture out. U-trough screws open along the top, giving higher rates, easier cleaning and better access for mixed or mildly sticky products.

Question 2

How are LS capacity figures interpreted?

Accepted Answer

The published figures assume a typical fill factor with a free-flowing powder at the listed speed. Real capacity depends on bulk density, inclination and flowability, so the model is confirmed against your material rather than taken from the table on its own.

Question 3

Can screw conveyors handle sticky or fibrous materials?

Accepted Answer

Not with a standard centre-shaft screw, which tends to bind or wrap. A shaftless screw opens the flow path and is the normal choice for sludge, biomass and stringy material. Where possible we confirm the design from a material sample before manufacture.

Question 4

When is vertical screw conveying applicable?

Accepted Answer

Where floor space is limited and the material is free-flowing. Vertical screws run at higher speed and typically lift up to about 8 m on standard designs. Efficiency falls as height increases, so above that we normally review a different conveying method.

Question 5

What maintenance is required?

Accepted Answer

Hanger bearings, flights and trough liners are the wear items, and their life depends on how abrasive the product is. Abrasive duties are fitted with replaceable liners so the casing itself is not consumed. Gearbox oil and drive alignment are checked at the same interval.

Question 6

What process data are needed for a quotation?

Accepted Answer

Please provide material name and bulk density, particle size and abrasiveness, required capacity in m³/h or t/h, route length and inclination, inlet and outlet positions, and any temperature or hygiene requirements.

Question 7

How do I pick a model from the capacity table?

Accepted Answer

Start with the required m³/h and find a tubular or U-trough row whose listed band covers it at the stated speed. LS200, for example, is 4 - 6 m³/h; LS-300U is 10 - 29 m³/h. Then check length, inclination and whether the powder is free-flowing. An incline or a sluggish powder needs a larger model than the horizontal table suggests. Bulk density converts m³/h to t/h only after the model is confirmed.

Question 8

When is a screw conveyor the wrong choice?

Accepted Answer

When the route is long, has many bends, or must stay fully closed across several floors. Listed machines run up to about 60 m where hanger bearings allow, which is a short plant transfer, not a silo-to-silo pipeline. For that duty, compare a pneumatic conveying system. For lifts above about 8 m, do not assume a vertical screw is still efficient.

Question 9

What does fill factor change?

Accepted Answer

The table assumes a typical fill of free-flowing powder at the listed speed. Sticky product, a steep incline or a partial feed all lower the fill, so the same screw moves less volume. We then select a larger diameter or a lower speed rather than quoting the top of the band. Particle size and a note on flowability are enough to make that correction.

Question 10

Can one screw have several inlets and outlets?

Accepted Answer

Yes. Several hoppers can feed one casing, and intermediate outlets can drop product along the run. Each extra opening needs a position on the layout, because it sets the flight direction and the length of each section. Send those positions with the total length.

Model	Type	Dia (mm)	Pitch (mm)	Capacity (m³/h)	Speed (r/min)
LS100	Tubular	108	90	0.8 - 1.0	80 - 100
LS125	Tubular	133	110	1.7 - 2.1	80 - 100
LS150	Tubular	159	130	2.5 - 3.2	70 - 90
LS200	Tubular	219	180	4 - 6	40 - 60
LS250	Tubular	273	230	6 - 8	30 - 40
LS300	Tubular	325	285	10 - 14	30 - 40
LS350	Tubular	377	330	17 - 23	30 - 40
LS400	Tubular	426	385	28 - 37	30 - 40
LS-200U	U-trough	200	180	3 - 8	30 - 80
LS-250U	U-trough	250	230	6 - 16	30 - 80
LS-300U	U-trough	300	285	10 - 29	30 - 80
LS-350U	U-trough	350	330	17 - 38	30 - 65
LS-400U	U-trough	400	385	18 - 42	20 - 45
LS-450U	U-trough	450	435	27 - 60	20 - 45
LS-500U	U-trough	500	480	36 - 70	20 - 40

Series	LS tubular · LS U-trough · Shaftless · Vertical (custom)
Orientation	Horizontal / inclined / vertical
Typical length	Up to about 60 m, hanger-bearing dependent
Capacity class	From under 1 m³/h to about 70 m³/h (see model range)
Product temperature	Typically up to about 200 °C on standard builds
Construction	Carbon steel / stainless; wear liners for abrasive or shaftless duty
Drive	Gear motor / reducer; VFD optional
Listed diameters	108 - 426 mm tubular (LS100 - LS400); 200 - 500 mm U-trough (LS-200U - LS-500U)
Listed pitch	90 - 385 mm on tubular models; 180 - 480 mm on U-trough models. Pitch is fixed per row in the model table.
Listed capacity bands	About 0.8 - 37 m³/h tubular and about 3 - 70 m³/h U-trough, at the speeds in the table, for free-flowing powder
Vertical lift	Standard vertical screws are typically considered up to about 8 m. Above that, compare a different conveying method.
Inclination	Table capacities are not steep-incline ratings. As the angle rises, fill falls and a larger diameter or a lower rate is required.

Screw Conveyor

About Screw Conveyor

Working principle

Tubular, U-trough and shaftless

Where it fits in the process

Key Features

Typical Specifications

Model range

General specifications

Suitable Materials

Cement & minerals

Food powders & grains

Chemical powders

Plastics & granules

Ash & dust

Sludge & fibrous solids

Industries Served

Chemical

Where this equipment is running

Screening, Weighing & Metered Feeding for Ternary Battery Materials

Vacuum Conveying to Ton-Bag & Small-Bag Packing for Pigments

Process Applications

Catalogs & Datasheets

Trough Screw Conveyor Datasheet

Tubular Screw Conveyor Datasheet

Shaftless Screw Conveyor Datasheet

CYprocess Powder Handling Product Catalog (2026)

Screw Conveyor FAQ

Enquire about Screw Conveyor