Vacuum couch roll-Aotian Machinery Manufacturing Co., Ltd.

Vacuum couch roll

Roller shell: 304 stainless steel/stainless iron

Box: 304 stainless steel/carbon steel(Carbon steel is easy to rust, so paint a layer of paint on the surface)

Shaft head: cast steel / ductile iron

Bearing: cast iron/Q235, cast steel

Sealing system: graphite、high molecular weight polyethylene

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Overview

The vacuum couch roll is located at the end of the wire section of the paper machine. Its structure is basically the same as that of the suction roll. It is composed of a roll body, a vacuum box, a bearing seat on the operating side and the transmission side, a water spray tube, an air cushion tube, a rubber wheel, and a vacuum regulating valve. The roller shell is made of bronze or stainless steel, and the thickness of the roller shell is determined by the required rigidity and strength.

Structure principle

The use of high-strength metal to make a vacuum press roll with a thin roll shell is beneficial to improve the efficiency of press dewatering. Vacuum pressing can remove more water from the wet paper. Compared with ordinary pressing, it can improve the dryness of the paper. The paper web is also less crushed. The dehydration is more uniform along the width of the banner, and the felt can maintain a stable and good condition.

Interval parameters

Working face	1600mm-6200mm
Diameter	650mm-1000mm
Center distance	1650mm-7000mm
Suction width	3000mm-5000mm
Wall thickness	30mm-40mm
Shell material	SUS304、SUS316

related products

Press roll

The press roll is the main component of the press device. Both ordinary press and positive press use flat roll press. The structure of the flat roll press, the upper roll is a stone roll, and the lower roll is a rubber roll. Both rolls have flat and smooth roll surfaces. The bottom roll of the flat roll press is a rubber-coated cast iron roll.

Combination roller

After the pulp is uniformly treated in the paper making process, because the pulp contains a large amount of water, it needs to be pressed to discharge the water during the forming process of the paper product. The composite roll is a commonly used dehydration part on the paper machine, and a large amount of water is evenly arranged on the surface. Hole, in the process of paper processing and production, it is necessary to use a composite roller to remove the moisture in the pulp.

Imitate stone roller

It is mixed with special grade synthetic rubber material and nano-grade filling material. It has good paper peeling performance and unconventional wear resistance. It can be used with a scraper and can meet the harsh application environment of high line pressure. The imitation stone rubber roller has low quality, high hardness, good paper making and release performance, impact resistance, abrasion resistance, acid and alkali corrosion resistance and high production efficiency. It is an ideal substitute for natural stone roller and has good social and economic benefits. Structure Principle The imitation stone rubber roller is composed of a metal roller core and a rubber coating (including a surface adhesive layer and an adhesive layer). In order to satisfy the imitation stone rubber roller with high hardness, good paper making and release properties, pressure resistance, abrasion resistance, and aging resistance , Heat resistance, acid and alkali corrosion resistance and other performance requirements, the surface glue adopts NR/BR/high styrene resin and the system as the main material, adopts glass hollow beads/zinc oxide/superfine aluminum silicate/white carbon black/methyl Magnesium acrylate system is used as reinforcement system.

Blind press roll

A large number of holes with a certain depth are drilled on the surface of the pressure roller. The depth of the holes is best to use two or three different sizes of depths and the same arrangement. The bottom of the holes is not connected to the atmosphere or vacuum, so it is called a blind hole.

Bow curved roll

The curved roller is a series of rotatable curved roller surfaces installed on the curved shaft to reach the roll that stretches the web, which can eliminate the wrinkles in the web traveling process and prevent the possible staggering during the material cutting process.

Soft calender roll

Its function is to make the paper web density uniform and soft and smooth. It can be lightly pressed on a calender and make the surface of the paper web smoother. Due to the elastic encapsulation, they have excellent heat resistance and scratch resistance. Soft calender rolls are mainly used on soft calenders.

Guide roll

Paper machine guide rolls are divided into two types: felt rolls and screen guide rolls. The application parts include pressing, drying, crimping, rewinding and other parts. Felt ducts, wire guide rolls, paper guide rolls, chrome-plated rolls, etc. are all over the front and back of the paper machine. Guide rolls guide and drive the wire and felt in the wet end and drying section of the paper machine. The guide rollers in both areas use the same bearings. However, different lubrication and sealing are used depending on the application location. In the old paper machine, the wet end section is usually lubricated with grease, and the dry section is lubricated with oil. In modern paper machines, both sections are lubricated with oil circulation. Due to different working conditions, the wet end and dry section need to be lubricated with their own oil circulation.

Vacuum couch roll

The vacuum couch roll is dehydrated through its internal vacuum chamber. Its dehydration strength mainly depends on the degree of vacuum in the vacuum chamber. The dehydration time and the amount of air passing through the wet paper are only secondary factors. The increase of the vacuum degree has a significant impact on the dewatering capacity of the roll, if the vacuum degree is increased by 5.3kPa, the dryness can be increased by 1%-1.5%. The dehydration time on the couch roll is very short. When the vehicle speed is low, water and air enter the couch roll and enter the vacuum chamber of the couch roll. In this case, a water-gas separator system must be used to separate air and water, so that white water will not enter the vacuum generation system. At higher speeds, most of the water escaping from the wet paper has no time to enter the vacuum chamber inside the roll. Usually 70%-80% of the water remains in the small holes on the roll surface or in the mesh of the forming wire. The higher the vehicle speed, the less water enters the vacuum chamber. The moisture remaining in the roll hole is thrown out by the air stream that is rushed into the small hole at a high speed at the moment after the roll hole passes through the vacuum box. Therefore, a white water pan and a water baffle must be installed to prevent the thrown water from returning to the entrance side of the meshing area between the bending roller and the forming wire or splashing on the screen driving roller with the white water pan.

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Products

Products

Vacuum couch roll

Overview

Structure principle

Interval parameters

related products

Press roll

Combination roller

Imitate stone roller

Blind press roll

Bow curved roll

Soft calender roll

Guide roll

Vacuum couch roll

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