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HOW TO CHOOSE BLADE Home-->Products
About choosing the Doctor Blade Material
Durable blade materials prolong normal operation time
The scraping function of the blade is getting more and more important when paper making machine is running faster and faster. It naturally demands blades functioning properly in every part of the paper making machine; only in this way can avoid expensive stopping and improve the production line efficiency and prolong the normal operation time.
To achieve the best scraping result, blade material must satisfy the demands of technology, consist with the property of the blade and have a certain duration and stiffness. And the blade’s external form must adapt to the surface of the rollers to achieve the best shoveling and scraping result. The correct property of the blade ensures the best using effect on all production conditions.
EP blades range from composite blades, carbon fiber blades, and coating blades, repairing blades, blue steel blades, ceramic blades and polymer blades. We have a wide range of blades for your choice. We can meet and possible demand in paper making industry.
The basic technological principles of installing blade devices
The technological principles abided by in selecting blade material:
Chilled iron casting roller cannot use stainless blades.
Chrome coated roller cannot use bronze blade
Steel roller cannot use steel blade
Copper roller cannot use monel blade.
Composite rubber roll cannot use metal blade.
Change new blade before increasing blade pressure.
Select Blades Based on Roll Materials

Roller

Roller cover material

Blades

Angle

Linear pressure(N/M)

1

2

3

minimum

maximum

Breast roll

Stainless steel

25°

88

131

Phosphorous bronze

25°

88

131

Hard rubber
(0~5P&J)

25°

88

131

Soft rubber
(5~20P&J)

--

--

25°

88

131

polyester

--

--

25°

44

131

Fiber glass

25°

88

131

Wire roll

Hard rubber
(0~5P&J)

25°

88

131

Soft rubber
(0~20P&J)

--

--

25°

88

131

Polyester

--

--

25°

44

88

Fiber glass

25°

88

131

Forming roll

Hard rubber
(0~5P&J)

25°

88

131

Soft rubber
(0~20P&J)

--

--

25°

88

131

polyester

--

--

25°

44

88

Fiber glass

25°

88

131

Press roll
(single press area)

Granite roller*

--

--

27°

175

359

Chilled cast iron

--

30°

175

350

Dynarok*

--

30°

175

350

Stonite roll*

--

27°

175

350

Microrok*

--

25°

175

350

polyurethane*

--

--

25°

88

131

Hard rubber*

--

25°

175

350

Soft rubber*

--

--

20°

88

131

Peeler*

--

--

25°

88

131

Press roll
(multi-press area)

Ceramic

--

25°

175

350

Granite roller*

--

--

30°

175

350

Microrok*

--

30°/25°

175

350

 

Roller name

Roller cover material

Blades

Blade angle

Linear pressure(N/M)

1

2

3

minimum

maximum

 

TOP ROCK*

--

25°/25°

88

131

Dynarok*

--

30°

175

350

Peerer*

--

--

25°

88

131

Press felt roll
&
grooved roll 

Hard rubber

25°

88

131

Soft rubber

--

--

25°

88

131

Fiber glass

--

--

25°

44

88

ventex

--

--

15°

88

131

polyurethane*

--

--

15°

88

131

Stainless steel

--

15°

88

131

Dryer
&
wet cylinder

Cast iron

--

27°

131

262

Cast iron
(the last dryer)

--

30°

131

262

Cast iron

--

30°

131

175

profiled bar

--

25°

131

262

Covering Teflon

--

30°

88

175

Yankee cylinder

Cast iron peeler

--

30°

262

525

Cast iron creping

--

25°/10°

525

700

Cast iron cleaning

--

30°

175

437

M.G.
cylinder

Cast iron peeler

--

25°

262

525

Cast iron cleaning

30°

262

525

Calendar roll

Chilled cast iron

--

30°

175

350

Chilled cast iron
(warm-up roll)

--

30°

175

350

Swimming roll(top roll)

--

30°

175

350

Swimming roll(bottom roll)

--

30°

262

437

Chilled cast iron(medium roll)

--

25°

131

262

 

Roller name & cover material

Material name

Blade angle

Linear pressure(N/M)

1

2

3

minimum

maximum

Super calender

Chilled cast iron

 

25°

175

350

Paper grain roller

25°

44

88

Light luster roller

Cast iron

--

25°

88

218

Chrome plated

--

25°

88

218

Light dry roller

Chilled cast iron

--

25°

175

262

Swimming roll

--

30°

175

350

Microrok

--

25°

88

131

Reeling drum

Cast iron

--

27°

218

350

Size press

Hard rubber

20°

88

175

Soft rubber

--

--

20°

44

88

Microrok

25°

88

175

chrome plated

25°

88

175

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