Paper Making Equipment Vacuum Suction Box UHMW Cover for Paper Mill

Product Description

Ceramic Dewatering Element for Paper Machine

Paper machine dewatering elements are very important equipment for paper machine wet section, they act as a dehydrator.

According to the different usage positions, they are respectively forming board,hydrofoil box ,low vacuum suction box,high vacuum suction box,and transfer suction box. In press section will use the felt suction box. The box material is stainless steel, and the cover is UHMW or ceramics material.

Different Material for Dewatering Element

Name	Cover option	Use position
Forming board	UHMW or ceramics	Wire part
HydroFoil box	UHMW or ceramics	Wire part
Low vacuum wet suction box	UHMW or ceramics	Wire part
High vacuum wet suction box	UHMW or ceramics	Wire part
Transfer suction box	UHMW or ceramics	Wire part
Felt suction box	UHMW or ceramics	Press part

The material of cover panel mainly have UHMW and ceramic material, the ceramic material mainly have three type, aluminium oxide ceramic ,zirconium oxide ceramic and silicon nitride ceramic.
 

Ceramic have better wear resistance, stability, and better service life. However, the investment cost of UHMW material is relatively low, if the vehicle speed is lower than 400m/min, UHMW material is ok. If over 400m/min, we recommend ceramic material.

The silicon nitride ceramic have better surface quality than zirconium oxide ceramic and aluminium oxide ceramic such as low power consumption and low fabric wear. If machine speed over 1200m/min, we recommend use silicon nitride ceramic. Lower 1200m/min we recommend use zirconium oxide ceramic; Lower 800m/min we recommend use aluminium oxide ceramic.

Machine speed	Material	Life time	Surface Quality	Investment Cost
<400m/min	UHMW	I	I	I
<800m/min	aluminium oxide ceramic	II	II	II
<1200m/min	zirconium oxide ceramic	III	III	III
>1200m/min	silicon nitride ceramic	IIII	IIII	IIII

Sun Hong Ceramic Material Analysis

Alumina Ceramics Sub 99%  AL2O3
Property	Unit	Value
Bulk Density	g/cm3	3.86
Hardness (HV)	Gpa	>14.7
Bending  strength	MPa	≥360
Fracture toughness	MPa	5-6 Mpa.m 1/2
Coefficient of thermal expansion		7.0-7.5x10-6.0c
Porosity	%	<0.04%
Water absorption	%	<0.025%
Surface roughness	---	≤0.5μm
Particle size		Submicron

Perforation Patterns

Slot and hole patterns are fabricated in any design at the most competitive prices. Five standard designs are available to choose from.

The suction box dewatering is based on the suction effect of the vacuum pump, which generates a high pressure difference between the top and bottom of the paper to force the dewatering of the wet paper. It help to transfer the paper to the press section with a higher dryness.
In the jet-fixing process, the suction box is installed under each spunlace device. It adopts a vacuum suction type. The suction box sprays the water from the spunlace head on the supporting net curtain into the water vapor separator. After that, the air is discharged by the blower, and the water is sent to the filtering device by the pipeline through the pipeline. The moisture content of the web after water absorption can be reduced to 25% to 35%

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SUN HONG GROUP

Sun Hong Group is professional manufacturer and designer for pulp and paper making machine. We can own manufacturing factory and own equipment design so that we can provide you most comparable price and good quality equipment. We have strong technical team and serivice team who have long experience in paper industry. If you need any help , welcome to contact us.