Nitta Belt Poly

8/13/2019 Nitta Belt Poly

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Power Transmission and Conveyor Belt

B-PB-03

NittaBeltPoly


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Nitta Corporation has developed NittaBeltPoly to meet the demandsof the customers in the power transmission eld, offering a wide varietyof types.

These products have delivered numerous results in power transmissionfor industrial machinery used in the textile, paper manufacturing andour-milling industries. Also for Nitta has also provided the best typesof NittaBeltPoly for conveyance used for printing and box-makingmachines.NittaBeltPoly , which is basically made up of a combination of thin andstrong polyamide lm and highly abrasion-resistant special rubber, is

widely used in industry.Nittas mission is to deliver high quality and reliable products and meetthe needs of the customers in the fast-changing market environment.

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Features

Types and Properties

Design MaterialsBiaxial Power Transmission Design

Belt Length Calculation Formula

Pulley Shape

Troubleshooting for Power Transmission Problems

Precautions for Use

For Safety Use of NittaBeltPoly


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Excellent abrasion resistance achieved due to the stablefriction coefficient obtained by using the special

synthetic rubber (NBR: Acrylonitrile Butadiene Rubber)(Taber Abrasion Test: 40 mg/1000 times)*Abrasive wheel used: H22, Load: 5N

Abrasionresistance

High-quality stretched polyamide film is used as atension member to provide high tensile strength.(Tensile strength of the tension member made of polyamide film: 300Mpa (3,000 kgf/cm2) or more)

High-tensiletension member

High-flex resistance and high-speed power transmissionobtained by using a thin and strong tension member toreduce the effect of centrifugal forces(Up to 70 m/s available)

High-speed powertransmission

NittaBeltPoly (except for some types) is subjected toantistatic treatment to obtain low electrostatic potential.(500 V or less)

Antistatictreatment

Wide variety of types available to meet the demands inall fields including power transmission and conveyance

Wide varietyof types

On-site endless processing is available by using Nittasspecial tools and adhesives.

Easy endlessprocessing

Features


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General power transmissionPaper feed section of theprinting machinePlywood conveyor

Moderate sliding propertieson both sides

Power transmission in industrialmachinery (fans, pumps, etc.)Sawmill machines(chippers, etc.)Paper working machines(coaters, etc.)Other power transmissionsCut-proof conveyors(thin-plate conveyors, etc.)

Standard typeSuitable for normaloperating conditions

CompressorsRolling machinesPaper tube winding machines

Abrasion-resistant conveyors(building material conveyors,etc.)

Highly abrasion/impactresistant thick cover rubber is used.Suitable for severeoperating conditions

Machine tools

(automatic lathes, etc.)Dryers (cylinder drying machine, etc.)Small to medium woodworking machinesSmall centrifugal pumpsand blowers

Thin rubber especially

suitable for flexing/high-speed operation

Major Applications Properties Belt Type

Total

Thickness

(mm)

TensionMember

Thickness

(mm)

Weight(kg/m 2)

Types and Properties


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Cover Material

Top surface

Weave

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Weave

to to

to to

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Weave

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Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Black

Green

Green

Green

Green

Green

B lue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Material Color Surface

configuration

Friction

coefficientMaterial Color Surface

configuration

For power transmission

For conveyanceFriction

coefficient

At 2%elongation

At 1%elongation

Axial load under stable conditions

(N/mm width; kgf/cm width)

Minimumpulley diameter

(mm) Standardmaximum

width(mm)

Temperaturerange for

continuous use()

(For intermittent use)

Bottom surface Antistaticproperty

(Against iron) (Against iron)





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Corrugated board machines (Paper feedingto and discharging from the rotary cutter)

Highly scratch/abrasion resistantsurface material used

Box making machines (Counter eject) High gripping force and abrasionresistance realized

For conveying cardboard boxes

Conveying cardboard boxesConveying plywood

Table-supported high speedconveyance possible

High conveyance capacityachieved due to the roughtop conveyor belt

Suitable for severeoperating conditions

Folder gluer Conveying plywood

High conveyance capacityachieved due to rubber properties

Table-supported conveyor Stopper conveyor

Excellent sliding on bothsurfaces

Table-supported conveyor Excellent sliding on onesurface

Sloping conveyor High conveyance capacity

achieved due to the roughsurface

Printer paper feed Top surface with high frictioncoefficientBottom surface with high slidingproperties

Properties Belt Type

Total

Thickness

(mm)

TensionMember

Thickness

(mm)

Weight(kg/m 2)

Major Applications

Approx.7.0

Approx.5.5

Approx.4.5

Approx.6.5

Approx.6.0

Approx.7.0


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Cover Material

Top surface

Material

Polyamide

Polyamide

Polyamide

Rough top

Rough

Rough top

Rough top

Rough top

Rough top

Rough top

Weave

Weave

Weave

Weave

Weave

Weave

Weave

Weave

Canvas

Canvas

Canvas

Weave

Weave

Weave

Rough weave

Rough weave

Rough weave

Color

Gray

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Green

Black

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Gray

Black

Blue

White

White

White

Black

White

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Blue

Black

Black

Black

Surface

configurationFlat andsmooth

Canvas

Canvas

Canvas

Canvas

Canvas

Canvas

Canvas

Canvas

Canvas

Weave

Weave

Weave

Weave

Weave

Weave

Canvas

Canvas

Canvas

Canvas

Canvas

Canvas

Weave

Weave

Weave

Flat andsmooth

Artificialleather

Artificialleather

Friction

coefficientMaterial

Polyester

Polyamide

Polyester

Polyester

Polyester

Polyester

Polyamide

Polyamide

Polyamide

Polyamide

Polyamide

Polyamide

Polyamide

Polyamide

Color Surface

configuration

For power transmission

For conveyanceFriction

coefficient

At 2%elongation

At 1%elongation

Axial load under stable conditions

(N/mm width; kgf/cm width)

Minimumpulley diameter

(mm) Standardmaximum

width(mm)

Temperaturerange for

continuous use()

(For intermittent use)

Bottom surface Antistaticproperty

Approx. 1.0(Against cardboard)



Approx. 1.0(Against cardboard) Approx. 1.0(Against cardboard)


(Against cardboard) (Against SUS)

(Against SUS)

(Against SUS)

(Against SUS)

(Against SUS)

(Against SUS)

(Against SUS)

(Against SUS)

(Against SUS)

(Against cardboard)

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to

to

to

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Design Materials

1. Biaxial Power Transmission Design

(1) Select the belt type according to the design power and the small pulley rotation speed shown in Table 1 below.

Table 1. Standard Transmission Capacity, Belt Speed andNittaBeltPoly Type

The types which are not shown in Table 1 (350, 750, 1500, 2500 and 3000) are positionedmidway between eachNittaBeltPoly type.

(2) Calculate the belt speed (V) by using the pulley diameter and rotation speed.

d: Drive pulley diameter (mm) n: Drive rotation speed (mm)

P: Transmission power (kw)

D: Large pulley diameter (mm)

d: Small pulley diameter (mm)C: Center distance (mm)

(3) Calculate the effective tension (Te) by using the transmission power and the belt speed.

(4) Calculate the pulley contact angle ( ) (for the open belt drive).

Design power (kw/10 mm width)

S m a

l l p u

l l e y r o

t a t i o n s p e e

d ( r / m

i n )


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(5) Obtain the traction coefficient ( ) from Table 2 below.

(6) Select the load reserve factor (K) from Table 3 below.

Use conditions

Excessively light start-up load; small load fluctuation(Belt conveyors and small centrifugal pumps)

Light start-up load; small load fluctuation(Printing machines and wood working machines)

Heavy start-up load; large load fluctuation(Printing machines, pressing machines and rolling machines)

Normal condition Environment with oil and dust

(7) Calculate the approximate axial load (2To).

(8) Calculate the belt width limit (b).

Round the calculated belt width to the nearest 5 mm.

bp: Pulley width (mm)

Table 3. Load Reserve Factor (K)

Table 2. Traction Coefficient ()

Contact angle ( )

T r a c

t i o n

c o e

f f i c i e n

t ( )


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2to(N/mm width) =

(9) Obtain the centrifugal constant from Table 4 below. Then calculate the centrifugal tension (tc) by the following calculation formula. Centrifugal tension (tc) = Centrifugal tension constant x Belt thickness (h) (mm)

Table 4. Belt Speed and Centrifugal Tension Constant

Belt speed (m/s)

C e n

t r i f u g a

l t e n s

i o n c o n s

t a n

t ( N )

(10) Calculate the axial load (2to) per unit width (N/mm width).

The allowable belt elongation rate is 1 - 3 %.When the belt elongation rate is outside this range, take the following measures.a. Change the belt type. b. Change the belt width.

(11) Calculate the elongation rate ( ) of the selected belt.

(12) Calculate the axial load (F) by using the belt tension.

(Note) For multiaxial power transmission and conveyance, consult us.

During operation stop:

During operation:

'' : Standard elongation rate (2 %)2to (2 %): Axial load under stable conditions (N/mm width) at 2 % elongation


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Pulleydiameter Pulley

width

2. Belt Length Calculation Formula

3. Pulley Shape

Calculate the inner peripheral length (Li) as follows:

The length ofNittaBeltPoly is determined according to the pitch length (Lc). Convert Li obtained above into Lc .

(1) Calculate the pulley width (bp) from the following formula.

(3) Calculate the curvature radius (rc) from the following formula.

(4) The pulley surface finish is required to be 6.3S or more.

(5) Belt speed and pulley material

Belt speed 30 m/s or less 30 to 50m/s 50 m/s or more

Pulley material Cast iron, aluminum,

mild steelCast iron or mild steel Mild steel

(6) As a rule, do not attach a flange to the pulley.

(2) Obtain the pulley crown (hc) from Table 5.

or more

Table 5. Standard Crown hc (mm)

(Note) Please inform us of the pulley diameter and the coordinate; we will calculate the belt length for multiaxial power transmission.

When the center distance is fixed and there is no tension pulley in the device, shorten the belt length bythe elongation rate as shown in the calculation formula below.

Pitch length Lc =

Belt length (mm) = : Elongation rate (%)

h: Belt thickness (mm)

Inner peripheral length (A)

Inner peripheral length (B)

b = Belt width (mm)


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Precautions for Use

Belt Tension

The followings are the precautions for using NittaBeltPoly .

Measure the t ens ion mark and s t re tch the be l t toob ta in the spec i f i ed e longa t ion ra te . Rota te thebelt once or twice to stretch i t uniformly and checkthe tension mark.

Crossed Belt DriveNittaBeltPoly i s h i g h l y a b r a s i o n r e s i s t a n t .In order to lengthen the belt l ife, insert a rotator atthe intersection of the belt .

Belt ShiftersU s e r o t a r y b e l t s h i f t e r s . I f t h e s h i f t e r s d o n o trotate, belt abrasion is accelerated.S e t t h e s h i f t e r s a t t h e p o s i t i o n s w h e r e t h e b e l tenters the driven pulley.When selecting the belt type, consider the shift ingproperty as well as the transmission calculation.

Attaching the BeltW h e n a t t a c h i n g t h e b e l t , u s e a c e n t e r - d i s t a n c eadjuster.I f t h e a d j u s t e r i s n o t a v a i l a b l e , c o v e r t h e p u l l e yedges with waste c loth , e tc . to prevent damage tothe belt

Elongation rate of 2.0 %

Shifter


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Belt Elongation RateThe maximum allowable elongation rate for

NittaBeltPoly is 3 %.When the belt elongation rate is more than 3 %,use the belt type of one rank higher or the widertype.

Minimum Pulley DiameterThe minimum pulley diameters ofNittaBeltPoly forconveyance are l isted in Types and Properties atP. 3 to 6. When the belt speed is 5 m/s or less,the minimum pulley diameter for conveyance isavailable.

Resistance to ChemicalsNittaBeltPoly is not affected by wetting anddrying, machine oil , steam, fat , benzine, etc.However, be careful thatNittaBeltPoly is affectedby concentrated acids, phenols, ketones andalcohol.

Belt LengthNittaBeltPoly is manufactured according to thepitch length. When ordering the belt , specify thepitch length. When ordering the belt to be set at alocation where the center distance is notadjustable, specify the pitch length shortened inadvance by the specified elongation rate. (See P.

10.) Pitch length (Lc)

Belt thickness (h)

C h e m i c a l


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Troubleshooting for Power Transmission ProblemsWhen any of the following failures occurs, troubleshoot as follows:

Failure Failure Diagnosis Troubleshooting

The belt comes off the pulley. The belt deviates at start-upand then returns

The starting torque is too high;tighten the belt further or lower thestarting load.

The specified speed is notreached.

When further tightening thebelt, the rotation speed doesnot increase.

Measure the pulley diameter.When the speed ratio is large, addthe belt thickness to the pulleydiameter.Measure the rotation speed of thedriver.

The bearings are excessivelyheated.

Check for excessivetightening of the belt.

Check the tension mark or measurethe tension by the tensiometer. Ifthe tension is too high, loosen thebelt.If the belt is too wide for the load,

narrow the belt width.

Belt deflection The belt deflects to the pulleyaxis. (Snaking)

When slight snaking of the beltaffects the function, check that thebelt is not bent.

The belt deflectsperpendicularly to thedirection of the pulley axis.(Waving)

The vibration frequency of themachine resonates with that of thenatural vibration frequency of thebelt; change the belt tension.

The belt tension isappropriate.

Select appropriate bearingsaccording to the bearing allowableload and rotation speed.Check for shortage of thelubricating oil.

The belt comes off even whenthe load is low.

Correct the pulley parallelism.Tighten the part where the beltcomes off.If the tension pulley is used, tilt itsaxis.

When further tightening the

belt, the rotation speedincreases.

Check for excessive load.

Check the belt tension and thetension rate.Recheck that the belt transmissioncapacity is appropriate for the load.

At a place with excessively hightemperature, tighten the belt further.

Normal when the load is low;the belt comes off when theload becomes high.

The load is high; tighten the beltfurther or lower the load.

Heat

Heat

Heat


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For Safety Use of NittaBeltPoly

1. Function and Performance

2. Storage and Shipping

3. Attaching the Belt andDaily Use

DANGER

DANGER

WARNING

WARNING

4. Attachment, Endless Processing, etc.

5. Handling Used Belts

WARNING

WARNING

CAUTION

CAUTION

CAUTION

CAUTIONDo not useNittaBeltPoly as hoisting or towingequipment.

Do not useNittaBeltPoly beyond the acceptablerange specified in the Catalog.

When fire and malfunction of the controlledequipment are expected due to static electricitygenerating in the belt transmission device,use an antistatic belt. Set a neutralizationapparatus in the transmission device.Do not useNittaBeltPoly for conveyingprepackaged food.

NittaBeltPoly is combustible; do not store or useit near fire or a high-temperature heat source.When storing heavy belts, fix them by appropriate jigs or stoppers to prevent falling and rolling.

When storing and shipping the belts, do not distortthem excessively.

Store the belts in a low-temperature place freefrom direct sunlight. The recommended storagetemperature is- 10 to + 30 .

Be sure to put a cover over the rotating part

including the belt.Before maintenance and inspection, be sureto turn off the switch and check that themachine stops.

When cleaning the belt, do not use chemicalsharmful to humans.

When using solvents or adhesives, fully ventilatethe workplace. Keep fire away from the workplace.

Carry out the endless processing by using thematerials, the methods and the proceduresspecified by Nitta.Handle solvents and adhesives as directed.

Do not burn used belts; harmful gasses may beproduced.Lawfully dispose of the used belts as industrialwaste.

After replacing the belt with a new one, performa test operation to adjust tension, elongation rateand operation.Do not attach the belt forcibly; use a motor slide,

a tension pulley or a special pulling device.When abnormal noise, snaking, deviation, skidding,etc. occur, stop the belt immediately for inspection.


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11031000U

4-4-26 Sakuragawa Naniwa-ku, Osaka 556-0022 Japan Phone: +81-6-6563-1225 Fax: +81-6-6563-1242

www.nitta.co.jp

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Room 2705, Sheng Gao International Building,No.137 Xianxia Road,Shanghai 200051, P.R.ChinaPhone: +86-21-6229-6000FAX: +86-21-6229-9606

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Nitta Belt Poly

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