siegling transilon

conveyor and processing belts

ELASTIC BELTS
RECOMMENDATIONS FOR
MACHINE DESIGN
Contents

Siegling – total belting solutions

2

Calculatingthe shaft load

2

Length tolerance

2

Design information forbelts without tracking profile

3

Design information forbelts with tracking profile

RECOMMENDATIONS FOR
MACHINE DESIGN

Effective pull Fu’ [N/mm]

Calculating the shaft load and elongation at fitting
The ideal elongation range is between 1.5 and 5.0 %.
We recommend our B_Rex calculation program for sizing belts.
A rough calculation for drums with a 180° arc of contact can bemade based on the following example:

1.00.8
0.6
0.4
0.2
000.5
11.52
Shaft load FW’ [N/mm]

2.53

Diagram 1: Calculating the minimum shaft load

Unit weight m[kg]Band width b[mm]Conveying speed[m/s]
Acceleration a[m/s2]
Friction coefficient µsteel 		Friction coefficient µsteel 		Friction coefficient µRoll 		Friction coefficient µgalvanized steel
relaxed k1% value		

35360
22
0.2
0.3
0.03
0.4
0.3

(for new belts)(on older friction surfaces)(with rolling support)(with galvanized support)

Elongation at fitting [%]5Fu = m · g · µ + m · a + number of returns x 20 N
= 35 kg · 9.81 kg · m/s2 x 0.2 + 35 kg · 2 m/s2 + 2 · 20 N = 179 N
Fu‘ = Fu /b = 179 N/360 mm = 0.5 N/mm

k1% = 0.2 N/mm
k1% = 0.3 N/mm
k1% = 0.6 N/mm

4321000.51
1.5
2
Shaft load FW’ [N/mm]

2.53> See diagram 1 for the shaft load(in this example, FW‘ = 1.5 N/mm)> See diagram 2 for the elongation at fitting,in this case, for a belt with a k1% = 0.3 N/mm
FW = FW‘ x b = 1.5 N/mm x 360 mm = 540 N

Diagram 2: Calculating elongation at fitting

Length tolerances

Belts without tracking profile:+0/–1.0 [% belt length]
Belts with tracking profile: 		+0/–1.5 [% belt length]
Take this information into account when placing an order. An appropriate take-up range must be provided for when designing the conveyor.

Design information for belts without tracking profilehDrum design
At least one drum must be conical-cylindricalin order to control the belt.
lT/4

lT/2

lT/4

lT

Conicity height h depends on the drum length lT :< 2000.4

400 – 600 600 – 1000
0.6
1.0> 1000
1.2

hlT [mm]
h [mm]

lT/3

lT/3

lT/3

Reversing operation
For reversing operation, at least 10 mm play should be allowed for
between the edge of the belt and edge of the slider bed.

lT
Recommended design of conical-cylindrical drums

2Drive types
The following types of drums should be used depending on the drive:
Head drive
Drive drum:
End drum:conical-cylindricalcylindrical

Tail drive
Drive drum:
conical-cylindrical
End drum: 	cylindrical (optionally: conical-cylindrical)
Center drive and reversing operation
Drive drum:
conical-cylindrical
End drum:conical-cylindrical
Snub roller:
cylindrical

Rolling support
Rolling support instead of a sliderbed could also be provided and also
reduces the effective pull.

Design information for belts with tracking profile
Despite the fact that the EL types are very easy to fit, tracking profiles must be applied when using
cylindrical rollers.

X+4
XThe following points need to be observed in the process:>1a– All drums must be cylindrical– At least one drum has to be adjustable in order to fit the belt
– The drum groove should be a wedge shape as in “a” (parallel to the profile form) andnot rounded as in “b”b– The slider bed groove should be designed to comply with “a” and be at least as wide as
the drum groove (in the case of very short and wide belts with profiles we advise belt guidance
via the drum and not the slider bed – in contrast to the recommendation for long belts).

Because our products are used in so many applications and due to the individual conditions involved, our operating instructions, details given andinformation on the suitability and usage of the products are only general guidelines and customers must still carry out checks and tests themselves.
When we provide technical support, the customer bears the risk of the machinery functioning properly.

3Siegling – total belting solutions
Committed staff, quality oriented organization and­production processes ensure the constantly high standardsof our products and services.

Our service – anytime, anywhere
Forbo Movement Systems employs around 2,500 people in its
group of companies. Our products are manufactured
in ten production facilities across the world.
You can find companies and agencies with warehouses andworkshops in over 80 countries.
Service points are located in more than 300 places worldwide.

Forbo Siegling GmbH
Lilienthalstrasse 6/8, D-30179 HannoverPhone +49 511 6704 0
www.forbo-siegling.com, siegling@forbo.com

06/23 · UDH · Reproduction of text or parts thereof only with our approval. Subject to change.

Ref. no. 335-2

Forbo Movement Systems complies with total quality management principles. Our quality management system has
ISO 9001 certification at all production and fabrication sites.
What’s more, many sites have ISO 14001 environmental
management certifi­cation.