Paper Machine Grooved Press Roll Rubber Coated

Grooved Press Roll Basis Information

Paper Machine Grooved Press Roll Grooved Roller For Paper Making Compared with the ordinary press, the grooved press is easy to dehydrate, the linear pressure is lower and the thickness of the rubber layer is increased. Therefore, the middle height of the roller can be reduced to avoid the high and uneven water content on both sides of the paper, resulting in the ribbed channel. When pressing, the direction of the blanket and wet paper is also important.

At the press section outlet, the wet paper sheet should be separated from the blanket as soon as possible, and the blanket should also be separated from the grooved roller as soon as possible, so as to avoid moisture returning to the blanket and the wet paper sheet. During operation, it is necessary to keep the groove of the groove press clean to prevent blocking and pay attention to the drainage of water in the groove. Also, the grooved roller needs to be equipped with a soft doctor blade to remove the high-pressure water from the groove to the roll surface.

Grooved Press Roll Function

Dewatering in the press section The main function of the press section is to dewater the fiber mat by means of mechanical pressure. The dry content is increased in the presses before the paper web is transferred to the dryer section. The higher the increase in dry content out of the press section, the less drying energy is needed. This makes the paper manufacturing process more efficient and cost effective. This is reason enough to make the dewatering of the paper web as efficient and effective as possible.

Various parameters affect dewatering performance

There are a number of variables that have an impact on the dewatering process. All should be considered. These variables include the surface geometry and distribution, furnish, and the design and conditioning of roll covers and clothing. The wide range of fibers in the industry is presenting new challenges in the press nip by increasing the structural resistance to flow. The press impulse is the basis for counteracting this resistance and ensuring optimum dewatering of the paper web. Many paper machines are identical in their press configuration and mode of operation, but their sheet structure and thus dewatering performance differ. Accordingly, every paper machine has to be analyzed individually and may have unique requirements for quality, hardness and surface characteristics of the covers.

Grooved Press Roll Optimization

The length of the flow path is a key factor in efficient dewatering. It is also crucial for understanding and minimizing sheet marking in the press section. The combination of surface quality, the arrangement of suction holes, blind-drilled holes and /or grooves determines how far the water has to travel before it reaches one of the collection chambers. The shorter the paths to the respective collection chambers, the lower the hydraulic pressure build-up and the more efficient the dewatering performance. Another important aspect is the design of the clothing, which also plays a significant part towards efficient dewatering.

Interplay between clothing, surface design and conditioning The optimum interplay between clothing, surface design and conditioning always needs to be considered as a whole to achieve the best possible result. For press rolls the surface design can be customized to achieve optimum surface geometries by means of the groove geometry or in combination with blind-drilled holes. However, in the case of suction press rolls the options are limited, as the arrangement of additional blind holes is predetermined by the core hole pattern in the roll core. The groove geometry, however, can be customized. Suction hole and blind hole markings are the most common kind of hydraulic markings, caused by the size of the suction hole diameters and a limited blind hole capacity. Trials have shown that it is not possible to completely drain a blind hole during each revolution. Although this reduces the operating volume by a considerable percentage, this can be substantially improved by suitable groove geometry. To both keep the void volume in the blind holes consistently higher and also minimize the tendency to marking due to hydraulic pressure build-up, the blind holes need to intersect with the grooves.

This allows the water to escape from the blind holes via the groove and makes a constant volume available. The flow paths to the collection chambers are also much shorter. The more even the surface distribution the more uniform the pressure distribution and the flow path of the water under load.

Micro groove designs are another option for making the flow paths much shorter. They also serve to make the pressure distribution in the surface of the cover as homogeneous as possible. Depending on surface design, the open surface can be up to 48% on suction press rolls and 42% on press rolls, although the percentage of open area is not a comparative factor for dewatering capacity. As an indicator for dewatering performance the operative volume (ml/ m²) of the various surface designs is compared.

About us

Huatao Group was founded in 2008. We are a professional and leading supplier of various rollers for paper machine, corrugator, rubber & plastic industry, nonwoven fabric industry over 15 years of experience.

Paper Industry: forming roller, vacuum couch roller, dandy roller, breast roller, rubber press roller, stone press roller, rubber roller, dryer cylinder, size press roller, calender roller, pope reel roller, spreader roller, embossing roller.

Plastic & Rubber industry: chill roller, MDO preheating roller, MDO nip roller, MDO stretching roller, PRS cooling roller, corona treater roller, corona treatment nip roller, flame treatment roller, CFRP contact roller, CFRP tension roller, CFRP nip roller, winding core, coating drum, cooling drum, spreader roller, anilox roller, calender roller, embossing roller.

Nonwoven fabric industry: cylinder roller, doffer roller, CFRP guide roller, embossing roller, cooling roller, spreader roller.

With a strong commitment to innovation, reliability, and customer satisfaction, Huatao Group has become a trusted provider in the industry and our products have been exported to more than 96 countries and have a good reputation.

Huatao understands that each customer may have different requirements, which cannot meet from one factory, but we can meet, we are also familar with domestic factory advantages with matching superior quality and help customer not walk bend road. We pursue each customer is buying and using HUATAO products with a rest assured heart and service is never end.