siegling extremultus
flat belts

PRODUCT RANGE

Siegling – total belting solutions

Not always visible, yet present everywhere,
Forbo Movement Systems makes surethat your logistics and production workflow run smoothly and optimally.
Our solutions are characterized by a highlevel of efficiency, precision and reliability.
We are in global demand as an expert partner in the development of industry-specificand future-oriented solutions for drives,
conveyor systems and manufacturing.

You can find brochures withmore information on using
Siegling Extremultus belts at:www.forbo.com/movement> Downloads > Product Brochures> Siegling Extremultus

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SIEGLING EXTREMULTUS
FOR POWER TRANSMISSION,CONTROL AND CONVEYING TASKS
Siegling Extremultus high efficiency flat belts are easy to handle andtrack superbly even at high speeds. Available in various designs theyenhance power transmission and conveying in many industries.

Contents
Siegling Extremultus is used successfully in a broad range
of applications in industries such as:

4Special strengths of flat belts– Drive technology

6

Design and materials– Paper and cardboard box manufacturing and processing

10 Application groups– Yarn manufacturing– Distribution processes– Food processing
In these areas, Siegling Extremultus belts can often play a key roleother than just transmitting power.
The structure of the tension member and the coatings on the underside and top face govern the characteristics of the flat belt. The
Siegling Extremultus range includes diverse lines with various tension
members and types of coating based on these.
This variety means a vast choice of different types to enable sophisticated, cost-saving designs and efficient operation of machinery.

The current product range can be found under
the following link:
https://forbo.blob.core.windows.net/
forbodocuments/7261/216_0.pdf

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14 Manufacturing tolerances
15 Delivery dimensions

SPECIAL STRENGTHSOF FLAT BELTS
Flat belt drives can be used at high speeds, can transmit high power and are extremely efficient. They boast
other i­ nteresting advantages:

Versatile and simple drive design

High efficiency

Due to their great flexibility and the option of using bothsides of the belt for drive tasks, flat belts can be used ina wide variety of drive configurations (see series of figures on next page).

Flat belts are significantly more efficient than V-belts andV-ribbed belts. This is mainly due to friction losses. In ad­dition to losses resulting from slip and hysteresis, which areminimal with flat belts and at times considerably higher
with V-belts and V-ribbed belts, the edge friction present
with V-belts and V-ribbed belts can also lead to friction losses. The more pronounced the wedge, the higher the contact surface between the edges of the wedge and thepulley. As the contact surface increases, so too does theedge friction and the friction losses.

As flat belts are custom made, there is no need to adhere
to standardized lengths and widths when designing thedrive. Due to their flat design, flat belts enable relatively
low drum diameters. The even surface also makes thedrive and drum pulleys easy to manufacture and thus
cost-effective.

Long lifetimes
Flat belts boast long lifetimes due to their high abrasion
resistance. The constant friction coefficient guarantees
constant RPMs across the entire service life. The materials
used for tension members (polyester, aramide and poly­amide) maintain their tension extremely well, necessitating re-tensioning in exceptional cases only. Flat belts
with plastic tension members and elastomer coatings aremaintenance-free.
Chrome leather coatings, used mainly for heavy duty
drives, must be treated from time to time with a special
spray paste in order to maintain smooth tracking andslip behavior.

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When it comes to flat belts, the loss of efficiency as aresult of slip is so minimal that the efficiency (> 98 %) isin the range of form-fit drives such as timing belt drives
and gear drives and sometimes even greater.

Low operating noises
Flat belts produce high-frequency, low-amplitude noise.
The coating on the underside of the belt can minimize
noise, e.g. select a chrome leather layer or texture theelastomer layer. That is why flat belts generate considerably
less operating noise than V-belts or V-ribbed belts.

Wide range of application➀

Practically speaking, considering flat belts as pure drive
elements often falls short. In addition to the classicaldrive function, they also provide great support whenit comes to industrial (production) processes; e.g.
processing boxes.
Flat belts have also been performing conveyor tasks foryears. This has been primarily in the field of electronics
and the food industry, including the manufacture of solar
cells and the production of baked goods. These processes
are far too complex for other types of belts.

➁➂– Flat belts are the only ones that can execute thenecessary, sometimes highly complex, belt processes.

➃– Only flat belts have such a wide range of different
characteristics at their disposal, including the fact thatthey can be food-safe and ESD compatible, etc.
– Only flat belts can be individually sized and fabricated,
including the option of belt edge processing and theapplication of profiles etc.
➄➅

➀ Classical two-pulley drive➁ Multiple pulley drive➂ Mule drive➃ Taper-cone drive➄ Half twist drive➅ Multi spindle drive

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DESIGN AND MATERIALSStructural diagram of a flat belt
Top face
Tension member
		Underside

Tension member design

Fabric in warp and weft

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Sheet (highly oriented)
or Foil (elastic)

Truly endless cord

The diagram (page 6) depicts the construction of a flat belt made up of a tension member as well as coatings on
the top face and the underside. Depending on the choice of material and the sub-type etc., flat belts have very
different properties, making them suitable for a wide variety of applications.

Tension member

Surface pattern

The technical properties of a flat belt are pri­mari­ly
determined by its tension member. For this reason,
Siegling Extremultus flat belts with the same tension
member materials are grouped in product lines.

Tension member materials
A = Aramide line
E
= Polyester line
P = Polyamide line
U = Polyurethane line

➀

➁

➂

➃

➄

➅

Coating
The coatings are in direct contact with the drive pulleys(generally the underside of the belt) and, where necessary,with the product to be conveyed (generally the top faceof the belt). Skillful selection of the material and surface­pattern make it possible to determine contact-specificproperties such as grip, chemical resistance, electrostatic
properties and food compliance.

Coating materials
G = G elastomerL= Chrome leather
N =	Novo (nonwoven polyester material)
P = Polyamide
R = High/Medium gripT=	Fabric (Polyamide, Polyester, mixed)
U = Polyurethane

7➆➀ FBRC fabric➁ FSTR fine texture➂ GL smooth➃ GSTR coarse texture➄ LTHR leather➅ NP inverted pyramid texture➆ NSTR normal texture

Typical combinations
Not all combinations of tension members and coating
materials are practical. Years of experience with the use offlat belts in a variety of applications have led us to offer
the current combinations seen below:

Abbreviation

Product line

A

Aramide line

E

Polyester line

P

Polyamide lineU

Polyurethane line

Tensionmember design

CoatingFabric

G, U

Cord

G, L, T

FabricG, N, P, R, T, U

Cord

G, L, T, U

FabricG, N, T, U

Sheet

G, L, N, R, T, U

Foil

G, R, UDESIGN AND MATERIALS

Aramide line

Polyester line

Flat belts with a tension member made from mixed fabricwith aramide yarn in the direction of tension are especially
flexible and extremely strong. They can be spliced directlyon the machinery.

Flat belts featuring a polyester fabric tension member are
the best choice for many applications. They are particularly
flexible and strong at the same time and can be spliced on
the machinery.

Flat belts with a tension member made from truly endlessaramide cord have no splice to ensure particularly smooth
tracking.

Flat belts with a tension member made from truly endlesspolyester cord have no splice to ensure particularly smooth
tracking.

Siegling Extremultus flat belts of the Aramide line aredesigned for extremely high effective pull and extremely
short take-up ranges. The aramide line must be handledwith great care as the aramide fibres can easily be bent.

Polyester line Siegling Extremultus flat belts can transmit
high circumferential forces with simultaneously shorttake-up ranges. In addition, they are shock-resistant andnot susceptible to fluctuations in climate.

8Polyamide line

Polyurethane line

Flat belts with a tension member made from highlyorientated polyamide sheet boast particularly strong
edges, are laterally stiff and durable.

Flat belts with a tension member made of highly elastic
polyurethane foil are elastic, highly flexible and boast
excellent damping capabilities. Due to their flexibility,
Siegling Extremultus flat belts in the polyurethane line havegood tracking characteristics and are particularly well suitedfor machinery with short center distances, manual take-up
units and small drum diameters.

Flat belts with a polyamide fabric tension member areespecially flexible and feature relatively high tensile strength.
Polyamide is characterized by its outstanding damping
capabilities. The hygroscopic properties of the polyamide
material make it important to take into account extreme
climatic fluctuations during storage and use.

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In addition, the polyurethane flat belts are 100 % fray free andvery easy to clean. That makes them perfect for use in areas
where hygiene is vital.

APPLICATION GROUPS
Siegling Extremultus
Power Transmission Belts
The material and structure of the tension member aswell as the coatings of the top face and underside
determine the characteristic profile of each flat belt.
The Siegling Extremultus range offers a wide variety
of products for the application groups, including­different tension members and coating variants:– Power Transmission Belts– Live Roller Belts– Tangential Belts– Drag Belts– Folder Gluer Belts– Machine Tapes– Elastic Food Belts
The drive function is often mixed with sometimes
extremely demanding process tasks, particularly in the last
four groups. Siegling Extremultus flat belts boast versatile
belt properties, perfectly supporting these processes.

Siegling Extremultus Power Transmission Belts feature
impressively high efficiency (≥ 98 %), outstanding synchronization accuracy and easy handling.
They are also characterized by:– consistent and reliable speed and long service lives– short take-up lines, low creep– good damping capabilities– durability up to a capacity of 1850 kW– their ability to easily handle bevel and cone drives inwhich the belt rotates on its longitudinal axis
Typical coating combinations
LT = Leather underside, Fabric top face
LL = Leather underside and top face
GT = G elastomer underside, Fabric top face
GG = G elastomer underside and top face10

Siegling Extremultus
Live Roller Belts

Siegling Extremultus
Tangential Belts

Siegling Extremultus Live Roller Belts are energy-saving,durable drive components that ensure quick and reliable
distribution.

Siegling Extremultus Tangential Belts have been designed
to suit the wide range of yarn-manufacturing processes anddifferent drive shapes. They play a major role in ensuringconsistently high yarn quality and efficient production
thanks to the following characteristics:

They are also characterized by:– constant tension regardless of climate(aramide and polyester line)– superior abrasion-resistant coatings made of elastomer Gor polyurethane with constant friction coefficients andlong service lives– high flexibility and tensile strength– optimized surface textures for the spindle and motor side

– low power loss due to reduced flexing force– reduced belt slip and excellent levels of
power transmission– durable friction layers with constant grip

– short downtimes due to quick installation
Typical coating combinations
GG = G elastomer underside and top face
UU = Polyurethane underside and top face
RR = Medium Grip underside and top face

– energy-efficient polyester or aramide tension members– highly orientated polyamide sheet tension memberswith good damping capabilities– low-noise and low-vibration operation– antistatic finishes
Typical coating combinations
GG = G elastomer underside and top face
UT = Polyurethane underside, Fabric top face

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APPLICATION GROUPS
Siegling Extremultus
Drag Belts

Siegling Extremultus
Folder Gluer Belts

Siegling Extremultus Drag Belts are special developmentswith superior mechanical and electrostatic characteristics
which make conveying and handling electronic components more efficient and safe:

In the manufacture and processing of boxes and corru­gatedcardboard, Siegling Extremultus Folder Gluer Belts play a
key role in ensuring that the quality and productivity potential of the machinery is exploited to the full. The Extremultus
product range offers the right flat belt with specific characteristics for each application:– thanks to the HC or HC+ properties (highly conductive
or highly conductive plus) the static charge that builds up
in the conveyor can be discharged in a more controlledmanner– due to simplified accumulation with TT types which
produce consistently low friction coefficients on the top
face and underside– due to a particularly high level of abrasion resistance,
as well as stable, fray free belt edges
Typical coating combinations
TT = Fabric underside and top face12

– thanks to tension-stable tension members made ofpolyester or aramide fabric, polyamide sheet or elastic
polyurethane– thanks to “custom grip” with a variety of surfaces thatare gentle on products – also approved for direct contact
with food– thanks to constant grip and long service life
Typical coating combinations
GG = G elastomer underside and top face
RR = Medium Grip underside and top faceSiegling Extremultus
Machine Tapes

Siegling Extremultus
Elastic Food Belts

Siegling Extremultus Machine Tapes are vital components
of machinery in many industrial applications. Tension members made of polyester fabric, polyamide sheet or polyurethane make them ideal for a range of different areas.
Siegling Extremultus machine tapes boast:

Siegling Extremultus Elastic Food Belts are specificallydesigned for applications in the food industry. The tension
member is made of elastic polyurethane and is thus 100%
fray free. Siegling Extremultus elastic food belts are:– superior abrasion-resistant coatings with constant friction
coefficients and long service lives– available in blue or white to optimize quality assurance(contrast to food)– surface textures and coatings, as well as electrostatic
properties in keeping with requirements– elastic and thus excellent for short center distances,
belt scales and are suitable as spreading belts– damping capability tailored to requirements (dependingon the tension member)– easy to clean– low elongation at fitting, low shaft load
– suitable for small drum diameters/rolling knife edges
Different coating combinations, e. g.
GG = G elastomer underside and top face
TT = Fabric underside and top face
TG = Fabric underside and Elastomer G top face13

– food-safe; FDA and EU compliant– chemically resistant– available with High Grip coating
Select Siegling Extremultus elastic food belts also support
the HACCP concept.
Typical coating combinations
UU = Polyurethane underside and top face
UR = Polyurethane underside, High Grip top face

MANUFACTURING TOLERANCES
As a general rule the manufacturing tolerances indicated in the following tables apply. They do not include
any geometric changes that may occur following manufacture as a result of climatic fluctuations or otherexternal influences.
In some cases, special tolerances are also possible upon request. Please contact your local representative:
www.forbo.com/movement > Contact

Length tolerances

Width tolerances

Polyester line and Aramide line (fabric)

Polyester line and Aramide line (fabric)

300 – 5000 mm± 0.30 %10 – 120 mm+ 0.2/– 0.3 mm

5001 – 15000 mm± 0.20 %121 – 500 mm± 1.5 mm

> 15000 mm± 0.15 %> 500 mm

± 5.0 mmPolyester line and Aramide line (cord)

Polyester line and Aramide line (cord)

500 – 1000 mm± 0.50 %20 – 50 mm± 1.0 mm1001 – 5000 mm± 0.40 %51 – 100 mm± 1.5 mm

> 5000 mm± 0.30 %101 – 250 mm± 2.0 mm

> 250 mm

± 3.0 mmPolyamide line (sheet and fabric)
300 – 5000 mm± 0.50 %Polyamide line (sheet and fabric)

5001 – 15000 mm± 0.30 %10 – 50 mm± 1.0 mm

> 15000 mm± 0.20 %51 – 120 mm± 2.0 mm

121 – 500 mm± 3.0 mm

501 – 1000 mm± 10.0 mm

Polyurethane line
300 – 5000 mm± 0.30 %

5001 – 15000 mm± 0.20 %Polyurethane line

> 15000 mm± 0.15 %10 – 120 mm+ 0.2/– 0.3 mm

121 – 500 mm± 1.5 mm

> 500 mm

± 5.0 mmThickness tolerances
Siegling Extremultus flat belts can have different
thickness tolerances depending on the combinationof tension member and coating material. Please always
observe the information on the respective data sheets.

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Tolerances for perforations
All lines
Diameter of hole

± 0.5 mm

Spacing between holes± 1.0 mm

DELIVERY DIMENSIONS
Siegling Extremultus products are produced in large widths and extremely long lengths of roll material.
The products can then be delivered in different, customer-specific ways, depending on production or­standard delivery dimensions.

Available as

How to measure order length

All Siegling Extremultus flat belts,
except for those with tension members
made of truly endless cord, can bedelivered in the following three forms:

When ordering flat belts spliced endless, the length is measured inside, i.e. on
the underside.

– open, as roll material– prepared for on-site installation in
the following variants– cut at 90° or 60° angles– prepared for being made endlesson one side
– prepared for being made endlesson both sides

To do this, place the flat belt on its edge, affix a steel tape firmly on its inside(Fig. 1) or measure directly over the pulleys (Fig. 2).
If your machinery has a take-up unit, it should be adjusted to determine theorder length as shown in figure 3.
The order length should be determined when the take-up unit is in the zero
position. We recommend selecting a zero position for the take-up unit thatenables a take-up line greater than the path required to apply the elongation at
fitting. In addition, it should be possible to have a return distance from the zero
position that is greater than the minus tolerance when manufacturing the belt.

– endless, spliced and ready to install(even flat belts with tension members made of endless cord)
Please contact your local representative for more information about thedelivery forms available:
www.forbo.com/movement >Contact
We will be delighted to help.

1

2

Return distanceTake-up line > εZero position

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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
and workshops 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

11/22 · UDH · Reproduction of text or parts thereof only with our approval. Subject to change.

Ref. no. 225-2

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.