Composite squeeze drying roller is an industrial roller body made by a composite process of multiple materials, mainly used for extrusion dehydration, liquid removal or leveling of various sheet, strip or fiber materials. Its core structure usually consists of a high-strength core shaft, an elastic composite material layer, and a surface functional layer. By complementing the properties of different materials, it achieves a comprehensive function of "rigid support+elastic extrusion+wear and corrosion resistance".

The working principle is based on the contact and extrusion between the roller body and the material. When the material passes through the roller gap formed by two composite extrusion rollers, under the preset pressure, the moisture or liquid in the material is squeezed out. At the same time, with the special texture or smoothness of the roller body surface, uniform dehydration and surface finishing of the material are achieved. Compared to traditional single material extrusion rollers, composite extrusion rollers can ensure extrusion efficiency while reducing material damage and extending equipment service life.

Advantages and Characteristics

Efficient squeezing and better dehydration rate

The elastic composite material layer of the composite extrusion roller has precise compression rebound performance, which can automatically adjust the contact pressure according to the thickness of the material, ensuring that all parts of the material are evenly stressed. The dehydration rate is 15% -30% higher than that of traditional steel rollers, greatly reducing the energy consumption in the subsequent drying process.

Composite materials for stronger durability

The composite structure of "metal mandrel+wear-resistant elastic layer+anti-corrosion surface layer" is adopted. The mandrel ensures the overall rigidity and bearing capacity, and the elastic layer cushions the impact load. The surface layer has the characteristics of wear resistance, acid and alkali resistance, and aging resistance. Its service life can reach 2-3 times of the traditional Rubber Roller, reducing the shutdown loss caused by frequent replacement.

Wide adaptability, protecting material quality

By customizing the hardness of the elastic layer (usually adjustable between Shore A 60-90) and surface texture, materials with different hardness and brittleness can be adapted. In the handling of fragile materials such as paper and fabric, it can effectively avoid scratching and tearing; In the process of extruding metal sheets, surface indentation can be reduced to ensure that the original physical properties of the material are not damaged.

Low maintenance cost, more stable operation

The surface of the roller body is less prone to sticking materials, reducing the frequency of cleaning; The bonding strength between the composite layer and the core shaft is high, making it less prone to delamination, cracking, and other issues; Having good temperature resistance (adaptable to working environments of -20 ℃ -120 ℃), daily maintenance only requires regular checks of pressure parameters and surface cleaning, reducing equipment operation and maintenance costs.

Strong customization, adaptable to diverse scenarios

We can customize roll body diameter (50mm -1000mm), length (300mm -6000mm), surface roughness, and hardness parameters according to production needs, and support the use of various squeezing and drying equipment (such as presses, dehydrators, and calenders) to meet the personalized production needs of different industries.

Application scenarios

Paper industry：

In the process of paper making, it is used for the pressing and dewatering of paper sheets. Through the elastic compression of composite rollers, excess moisture in the pulp is removed, and the tightness and strength of the paper sheets are improved. It is suitable for the production of various paper products such as cultural paper, packaging paper, and specialty paper.

Textile printing and dyeing industry：

For the post dyeing dehydration treatment of fabrics and yarns, composite extrusion rollers can efficiently remove dye residue without damaging the fibers, reduce drying energy consumption, and avoid wrinkling and uneven dyeing of fabrics, thereby improving the quality of printed and dyed products.

Metal processing industry：

In the dehydration process after cleaning of metal materials such as steel plates and aluminum plates, composite extrusion rollers can effectively remove surface moisture, prevent oxidation and corrosion, and protect the surface smoothness of the metal.

Food processing industry：

Suitable for dehydration treatment in fruit and vegetable slicing, potato processing and other processes, made of food grade composite materials that meet hygiene standards, do not contaminate materials during extrusion dehydration process, and ensure food safety.

Environmental wastewater treatment industry：

In sludge dewatering equipment, composite extrusion rollers are used for deep extrusion dewatering of sludge filter cake, reducing sludge moisture content, decreasing sludge volume, and facilitating subsequent transportation and disposal.

Leather and non-woven fabric industry：

The dehydration of leather after tanning and the removal of moisture in non-woven fabric production can be precisely controlled by the composite extrusion roller to ensure the stability of material structure and improve product texture.

Frequently Asked Questions and Answers

What should I do if the squeezing effect suddenly decreases and the moisture content of the material increases?

Possible reasons: Uneven pressure distribution caused by surface wear of the roller body; The elastic layer loses its rebound performance due to aging; Improper setting of pressure between rollers.

Solution: Check the surface wear of the roller body and grind it if necessary; Check the hardness of the elastic layer, and replace the roller body if it is severely aged; Re calibrate the pressure parameters to ensure even pressure transmission.

How to deal with local delamination or cracks on the surface of the roller body?

Possible reasons: Excessive parallelism error during installation; Long term overloaded operation; Local impact caused by the mixing of hard impurities in the material.

Solution: Immediately stop the machine and replace the damaged roller body to prevent the fault from expanding; Check installation accuracy and recalibrate; Strengthen the material pretreatment process to remove hard impurities; Adjust the operating pressure to the rated range.

What is the reason for abnormal noise or vibration during operation?

Possible reasons: Bearing wear or insufficient lubrication; Dynamic balance imbalance of the roller body; Foreign objects stuck between the rollers.

Solution: Stop the machine to check the status of the bearings, replace worn bearings, and supplement lubrication; Perform dynamic balance detection and calibration on the roller body; Clean up foreign objects between the rollers and check for surface damage.

How to choose appropriate composite extrusion roller parameters for different materials?

For fragile materials such as paper and fabric, it is recommended to choose an elastic layer of Shore A 60-70 with a surface finish of Ra 0.8-1.6 μ m; For hard materials such as metal sheets and thick cardboard, an elastic layer of Shore A 80-90 can be used, and the surface can be treated with anti slip texture; The food industry needs to choose food grade silicone or rubber composite layers to ensure FDA certification.

What factors affect the service life of composite extrusion rollers?

The main influencing factors include: material hardness and impurity content (the more hard impurities there are, the shorter the lifespan); Operating pressure and speed (long-term full load operation will accelerate wear); Maintenance frequency (regular cleaning and lubrication can extend lifespan); Working environment (high temperature, high humidity, or corrosive environment can accelerate material aging).