Indistrial Belts, Nylon Sandwich Belts, Coriamid Nylon Sandwich Belts

Coriamid^®

An optimum quality assurance system and the use of upto-date production facilities guarantee constant standard of quality of our flat belts. A wide range of belts for many applications are manufactured by us. Our R&D will also ensure new products from time to time.

HOW WE SOLVE YOUR PROBLEM

--- Advise on applications technology.

--- Comprehensive production range.

--- Fitting service.

--- Short delivery time even for special products.

BASIC STRUCTURE

Friction Layer

Fabric

Elastomer

Chrome Leather

Indistrial Belts, Nylon Sandwich Belts, Coriamid Nylon Sandwich Belts

Driving Layer Polyamide Strip

Top Surface

Fabric

Polyamide Fabric

Chrome Leather

ADVANTAGES AND SPECIAL FEATURES

--- Extremely high tear tensile strength ensures maximum life.

--- No permanent elongation

--- Energy saving

MAINTENANCE

Coriamid flat belts are practically maintenance free and only occasional cleaning is necessary. Contact surfaces of the belt pulleys should be kept smooth and dry.

TRAVERSE LOAD

Specific belt types have been developed for virtually all applications. Not only types are available with high radial rigidity for disengaging drives but types for good radial flexibility particularly for highly cambered belt pulleys are also available from our extensive range.

PERFORMANCE

Constant speed transmission, noiseless running, permanent anti-static and no re-tensioning required under normal operating conditions at speeds upto 50 mt/sec and load upto 5000 HP.

APPLICATIONS

Although Coriamid belts can be used in every possible application for power transmission and light conveying and its uses are gradually being extended to almost every field. The industries which presently use are

Textiles

Jute

Paper and Pulp

Shipping

Engineering

Tobacco

Mining

Iron and Steel

Agriculture

Foodstuffs

Power Generators

Tea

Soap

Sugar

Marble and Stone Cutting

Wood Work

Pharmaceutical

Packaging

Flour Mills

Printing

Table Load Correction Factor

Drive

Type of Machine

Correction Factor

Light starting load, uniform speed

Centrifugal pumps, electric generators, blowers, fans light textile machines, automatic lathes, light duty evenly loaded conveyors.

1.0

Medium load, uneven speed

Metal and wood working machines, milking machines small lathes, rotary compressors. Group drives, belt conveyors with intermittent loads.

1.3

Medium starting load, irregular speed, fluctuating load

Centrifuges, large fans, piston pumps, pulpers, dough mixers, ball mills, tube wills, grinding machines, carding engines, spinning carding engines, spinning frames, prop shafts, gang saws, piston pumps with speed fluctuation of 1:80.

1.3

Heavy starting, pulsating and intermittent loads

Calendars, paper mill rolls, brick machines, forging presses, power punches and shares, vibrators, dredgers rolling mills for nonferrous metals, piston pumps and compressors with speed fluctuations of 1:80, pan grinders, planners.

1.5

Very heavy starting, Very uneven speeds, unusually severs shock loads

Beater mills, crushers, extrusion presses, cold rolling mills, Heavy torque drives. Oily, dusty conditions.

1.7

Table II

MINIMUM PULLEY DIAMETER IN INCHES AND HORSE POWER PER INCH WIDTH

Belt Speed in F. P.M.

LF6

LF10

LF12

LF20

LF30

LF40

LL6

LL10

LL12

LL20

LL30

LL40

250

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

7000

8000

9000

10000

1½”

1¾”

2”

2¼”

2½”

2½””

2½”

2¾”

3”

3½”

0.33

0.65

1.29

2.02

2.83

3.26

3.99

4.52

5.15

5.57

6.09

6.51

7.04

7.98

8.72

9.45

9.66

3½”

4”

4½”

4¾”

5”

5½”

5W’

5¾”

6”

6½”

7”

7½”

0.65

1.20

2.42

3.57

4.83

5.99

7.35

8.51

9.45

10.40

11.24

12.08

13.02

14.60

16.17

17.53

17.85

6”

6W’

7W’

7¾”

8½””

8½”

9”

9½”

9¾”

10¼”

11¾”

0.94

1.8

3.6

5.4

7.2

9.0

11.0

12.8

14.7

16.7

18.1

19.3

20.9

23.3

25.5

26.8

26.9

7W’

7½”

7W’

8W’

9”

9½”

10”

10½”

11”

11½”

12”

12½”

13”

14”

15”

1.27

2.53

4.83

7.25

9.66

12.02

14.66

17.02

19.55

21.28

23.69

25.76

27.60

31.05

33.93

35.65

36.00

13”

14”

15”

15½”

16”

16W’

17”

17½”

18”

19”

20”

1.68

3.36

6.72

10.08

13.44

16.90

20.58

23.94

27.40

29.82

33.28

36.12

38.74

43,57

47.56

50.08

50.40

16”

17”

18”

18W’

19”

19W’

20”

20½”

21”

21W’

22”

23”

24”

25”

2.10

4.20

8.30

12.40

16.90

20.90

25.41

29.19

32.97

36.33

39.06

42.63

45.78

53,97

60.69

64.47

65.10

The minimum absolute of pulley diameters are

LF6/LL6/AR1

LF1O/LL1O/AR2

LF12/LL12/AR3

LF2O/LL2O/AR4

LF3O/LL3O

Lf40/LL4O

11/4”

21/2”

4”

83/4”

11”

Table III

DIFFERENCE

OF PULLEY

DIAMETERS

(INCHES)

Arc of Contact Correction (Factor For TWO-Pulleys Open Drives)

CENTRE DISTANCE IN FEET

.98

.96

.94

.92

.90

.88

.85

.83

.81

.79

.76

.74

.71

.66

.63

.58

.54

.99

.98

.97

.96

.95

.94

.93

.92

.91

.90

.89

.88

.87

.85

.84

.83

.82

.81

.78

.74

.70

.66

.99

.98

.97

.96

.95

.94

.93

.92

.91

.90

.89

.88

.85

.83

.81

.79

.99

.98

.97

.96

.95

.94

.93

.92

.91

.89

.88

.86

.84

.10

.99

.98

.97

.96

.95

.94

.93

.91

.90

.89

.88

1.00

.99

.98

.97

.96

.95

.94

.93

.92

.91

.90

1.00

.99

.98

.97

.96

.95

.94

.93

.92

.91

1.00

.99

.98

.97

.96

.95

.96

.94

.93

.92

1.00

.99

.98

.97

.96

.95

.94

.93

1.00

.99

.98

.97

.96

.95

.94

CALCULATION AND SELECTION OF CORIAMID^® NYLON SANDWICH BELTS

Belt Width, type and Length can be calculated by following the method given:

BELT WIDTH = Horse power rating x correction factor

H. P. per inch Width x Arc of contact factor

HORSE POWER RATING : As per motor Capacity

CORRECTION FACTOR : Select suitable type from Table I

H. P. per INCH WIDTH LOAD:

1) Calculate belt speed in feet per mm. FPM =Drive pulley Dia in inches x RPM x 0.2619

11) Refer FPM to table II against minimum pulley size (green fig.) figures in black show

HP/Inch rating value.

BELT TYPE IS SHOWN ON TOP SELECTED COLUMN LF TYPE ARE SUITABLE IF

BELT CONTACTS ONE SIDE AND LL TYPE IF BOTH SURFACE OF BELT CONTACT

PULLEY OR JOCKEY PULLEY ARC OF CONTACT CORRECTION FACTOR:

This value is not required If both pulleys are of same diameter. However if pulley dias are different then calculate the difference of diameter in inches and refer this to table III against appropriate centre distance.

B. BELT LENGTH = i) For open drive ii) For Cross drives

L=2C+1.57(D+d)+(D-d)² L=2C+1.57 (D+d) +(D+d)²

4C 4C

Where C = Pulleys centre distance D= Dia. of large pulley d=Dia. of small pulley

INITIAL TENSION OF BELT: In order that the belt maintains proper contact pressure it is necessary to manufacture belt with required tension. Generally the thumb rule is as under.

--- LIGHT DUTY UNIFORM LOADS : 1.5-2.0%

--- INTERMITTENT LOADS: 2.0 - 2.5%

--- SEVERE HEAVY INTERMITTENT LOADS: 2.5 - 3.5%

EXAMPLE

50 H. P., 1440 R. P. M. Electric Motor Driving Grinding Rolls, medium fluctuating load Drive pulley 19” diameter, 6” face. Driven pulley 24” diameter. 6” face Pulleys centre distance 96” Open Drive

STEP 1.

From table 1 service factor for grinding is 1.3.

STEP 2.

Surface Speed = 19 x 1440 x 0.2619 = 7165.6 f. p. m.

Using 7000 f. p. m. table II give HP/inch rating of 43.57

Coriamid belt type LF30/LL30. For simple open drive select LF30

STEP 3.

Table III give Arc of contact factor of 0.99

STEP 4.

Calculation Width W = 50x1 .3 =1.5"/38 MM

43.57x0.99

STEP 5.

Length of the belt L =2C+1 .57 (D+d) +(D-d)²

= 2x 96 +1 .57x43 + 25

4x96

=259.51"/6593 MM

STEP 6.

Tension the belt to 3%. Thus Belt selected is LF30

Width 1.5/38MM length 259.51/6593 MM and tension 3%

Crowning of pulleys:

Crowning of pulleys is very important but the crown height should be minimum. Excessive crowning causes intolerable strain on the belt and shortens its life. The recommended crown height is according to Table IV. The following information can be used as a guide for the amount of crowning required.

1. Pulley Ratio 1:1 Crowning of both the pulleys must be the same and equal to 0.5% of the width of the pulley.

2. Intermediate pulley ration: The larger pulleys should be crowned 0.75% of its width. Smaller pulleys should be crowned proportionately in relation to the pulley ratio.

3. High Pulley ratio: The small pulley should be fiat. Larger pulley may be crowned but the amount of crowning must not exceed 0.25 inches.

4. Crossed Drives: Crown both pulleys.

5. Flanged Pulleys: should be avoided as far as possible Coriamid’ belting has very good gripping power due to the high coefficient of friction of the chrome leather or polymer surface, and consequently has a tendency to climb the edge of a flanged pulley. In many cases where flanged pulleys cannot be avoided, the use of a narrow and thicker belt can be used to overcome this. Ensure correctly aligned pulleys and eliminate the pos excessive rubbing at the edges of the belt on the flange.

6. Relation of belt width to pulley Width: The width of the belt should be less that that of pulley, following table may be used as guide.

Table IV

Pulley Width (MM)	50	75	100	150	200	300	300	400	500
Belt Width (MM)	45	70	90	140	180	280	280	360	460
Height of Crown (MM)	0.4	0.4	0.8	0.8	1.2	1.2	1.6	2.4	3.15

For appropriate belts that meet your specific requirements, kindly send us the relevant information listed below. Our design department will furnish details and recommend the right belt for the right purpose.

1. Type of machine

2. Power to be transmitted.

3. Diameter, Width & speed of driving pulley.

4. Diameter and width of driven pulleys.

5. Shortest centre distance and possible take up.

6. Steel tape length around the pulleys.

7. Operating conditions (load, shocks exterior influences.)

Technical Specifications of Coriamid^® Transmission Beltings

Type	Total Thickness (mm)	Weight (kg/sq. mtr) Aprox	Min. pulley dia (mm)	Pull for 1% elongation (gg/cm)	Tensile Strength (kgs/cm)	Top Surface			Driving Surface			Max. temp. resistance (⁰C)
						Col.	Mat.	COF	Col.	Mat.	COF
LEATHER NYLON BELTINGS
LL-3	3.6	3.4	20	2	60	W	L	0.4	W	L	0.4	80
LL-6	4.0	3.7	40	4	120	W	L	0.4	W	L	0.4	80
LL-10	4.4	4.2	80	8	240	W	L	0.4	W	L	0.4	80
LL-12	5.0	4.6	100	10	330	W	L	0.4	W	L	0.4	80
LL-20	6.5	5.5	160	16	480	W	L	0.4	W	L	0.4	80
LL-30	7.5	6.7	240	24	720	W	L	0.4	W	L	0.4	80
LL-40	8.0	7.8	320	32	960	W	L	0.4	W	L	0.4	80
LL-50	10	8.9	400	40	1200	W	L	0.4	W	L	0.4	80
LF-3	2.2	2.0	20	2	60	R	F	0.3	W	L	0.4	80
LF-6	2.4	2.3	40	4	120	R	F	0.3	W	L	0.4	80
LF-10	3.1	2.8	80	8	240	R	F	0.3	W	L	0.4	80
LF012	3.4	3.5	100	10	330	R	F	0.30.3	W	L	0.4	80
LF-20	4.8	4.0	160	16	480	R	F	0.3	W	L	0.4	80
LF-30	6.0	4.5	240	24	720	R	F	0.3	W	L	0.4	80
LF-40	7.3	6.3	320	32	960	R	F	0.3	W	L	0.4	80
LF-50	8.5	7.3	400	40	1200	R	F	0.3	W	L	0.4	80
L-6	2.0	2.2	40	4	123	T	PS	0.2	W	L	0.4	80
L-12	2.8	2.8	100	10	330	T	PS	0.2	W	L	0.4	80
L-16	3.9	3.4	160	16	480	T	PS	0.2	W	L	0.4	80
LR-6	5.7	6.6	40	4	120	G	NR	0.7	W	L	0.4	80
LR-10	4.2	4.1	80	8	240	G	NR	0.7	W	L	0.4	80
LR-12	4.5	4.5	100	10	330	G	NR	0.7	W	L	0.4	80
FABRIC NYLON BELTING
FF-0	0.6	0.4	10	0.5	20	R	F	0.25	R	F	0.25	80
FF-3	0.8	0.6	20	2	60	R	F	0.25	R	F	0.25	80
FF-6	1.0	0.9	40	4	120	R	F	0.25	R	F	0.25	80
FF-10	1.5	1.4	80	8	240	R	F	0.25	R	F	0.25	80
FRI	1.6	1.4	50	4	120	G	F	0.25	G	F	0.7	80
RUBBER NYLON BELTINGS
AR-1	2.4	3.0	40	4	120	G	NR	0.7	G	NR	0.7	100
AR-2	2.6	3.3	80	8	240	G	NR	0.7	G	NR	0.7	100
AR-3	2.9	3.6	100	10	330	G	NR	0.7	G	NR	0.7	100
AR-3/6	6.0	6.7	100	10	330	G	NR	0.7	G	NR	0.7	100
AR-4	3.3	4.2	160	16	480	G	NR	0.7	G	NR	0.7	100
AR-5	3.9	4.6	220	19	570	G	NR	0.7	G	NR	0.7	100
ARS-1	2.4	3.0	40	4	120	G	NR	0.7	Y	NR	0.7	100
ARS-2	2.6	3.3	80	8	240	G	NR	0.7	Y	NR	0.7	100
ARS-3	2.9	3.6	100	10	330	G	NR	0.7	Y	NR	0.7	100
ARS-4	3.3	4.2	160	16	480	G	NR	0.7	Y	NR	0.7	100
TANGENTIAL BELTS
TA 15M	1.8	2.0	50	5	150	PG	NR	0.7	B	NR	0.7	100
TA 16M	1.8	2.1	50	5	150	PG	NR	0.7	B	NR	0.7	100
TA 24M	2.4	3.0	100	10	300	PG	NR	0.7	B	NR	0.7	100
TA 24MS	3.0	3.7	100	10	300	PG	NR	0.7	B	NR	0.7	100
TA 29HX	3.2	3.9	150	15	450	PG	NR	0.7	B	NR	0.7	100
TA 29HXS	4.0	5.1	150	15	450	PG	NR	0.7	B	NR	0.7	100
SPINDLE TAPES
ST-0	0.7	0.5	10