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Class Paper Machine Components 187 Parts 187 Dryers 187 Gears Manufacturer Beloit Materials Steel Part Number 35093 Qty 1 Description Beloit Helical Dryer Can Gear 40quot Diameter 7quot Face 6875 Bore 7quot Hub Unused Storeroom Spare
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Founded in the 1970s, it has a history of more than 40 years.
covering an area of 350,000 square meters
production and sales in more than 160 countries
The dryer section of a paper machine consumes large amounts of energy and can have a dramatic impact on the quality of your sheet and your bottom line the following are best practices for paper dryer inspections used for preventative maintenance purposes
Dryer fabrics play a major role in the process of drying and paper machine efficiency therefore voith has developed a full series of woven and spiral designs to suit all requirements optimal material choice and special designs support cleanliness heat resistance and runability to address our customers production goals
Dryer doctors have a number of purposes in a paper machine dryer section sheet shedding dryer surface cleaning threading and air handling and control paper dryer doctors are often overlooked in the papermaking process but they need proper attention to maintain efficient dryer operation
Dryers of paper machines are only tube heat exchangers simply said steam flows into the dryer the dryer is cooled by the paper and steam became condensate the condensate is collected at the bottom of the dryer is the speed more than 350 mmin the condensate moves with the dryer the reason is the friction between the
Energy use on the paper machine paper machines use between 50 and 80 of mill energy when there are no pulp mills on site some of this is electrical energy used in drives and in running vacuum pumps and stock pumps for moving fluids but steam used in drying the sheet is the biggest energy consumer water content of the sheetwhen sheet is just formed 991 is water
Adjustments of the temperatures of top and bottom dryer cans can be used to control the final curl condition of paper in the machine direction paper tends to curl most in the direction of the side or surface from which moisture migrates last curl problems during use can be expected if the moisture content of the paper does not correspond to
Paper machine dryer gearing as paper machine speed and widths increased a gear arrangement with greater torque capacity became necessary paper machinery builders began offering enclosed dryer gear cases with helical gears due to the increased torque capacity of the helical tooth form gear size could be reduced simplifying and reducing
Paper machine dryer rolls over the last two decades we have inspected thousands of dryer rolls following the industry standard for dryer roll inspections tappi tis 040216 guidelines for the inspection and nondestructive examination of paper machine dryers the tappi standard recommends the following types of inspection
Paper machines dryer courses our online paper machine dryer training courses provide essential training for paper manufacturers these courses cover dryer principles and
Older dryer sections that have been stretched beyond their original design specifications can become productivity and quality bottlenecks aggravating runnability problems limiting machine speeds and adversely affecting md and cd paper quality
Paper and board machines use steamheated dryer cylinders to dry the sheet to its final moisture target in a cascade steam system fresh steam is typically introduced to the main steam group and then it is cascaded upstream to the intermediate and wet end steam groups
In april 1989 four dryer cans in a vintage paper machine manufactured about 1914 by pusey jones corporation failed the investigation of the accident determined that the root cause of the failure was a torsional fatigue crack that initiated on the od surface of one of the cans
Class paper machine components 187 dryers 187 cans and sections manufacturer escher wyss part number 41420 size 110quot year manufactured 1980 qty 6 description escher wyss manchester 6 dryer can section rated 125 psi at 450 f 110quot working face 60quot diameter 1125quot with rope ring 115quot overall width enclosed bearings with rope system doctors felt guides felt rolls oil
On a paper or board machine the drying process involves both heat transfer and mass transfer heat transfer is the movement of thermal energy due to a temperature difference in multicylinder drying systems the driving force for heat transfer is the temperature difference between the sheet and the dryer
Paper machine dryer section is for paper drying there are two main aspects affecting paper machine drying efficiency steam pressure and heat transfer coefficient paper machine drying influencing factors steam pressure in order to improve drying efficiency the dryer temperature can be increased by increasing steam pressure but the maximum
On a paper or board machine steam is piped to the inside of each dryer can where it transfers its heat to the inside surfaces as it condenses into water when hot condensate is dumped into a receiver at a lower pressure some of the condensate will quotflashquot and produce steam
Paper machine or yankee dryer roll magnetic particle examination of the dryer journals is used to detect cracking that could lead to a catastrophic in service failure ultrasonic straight beam testing of 20 of the head bolts on each roll is used to further enhance the effectiveness of the dryer roll inspection
Nov 04 2015nbsp018332the rate of wear can vary based on machine size the larger the diameter of the dryer the faster the rockers and plates can wear dryer section speed dryer can misalignment extreme ambient conditions etc additionally if steam syphons are not working properly condensation gets trapped inside the dryer
In a large majority of paper drying applications the stationary syphon along with turbulator174 tube bars is the recommended solution for the most reliable dryer drainage th cantilever stationary syphon is designed for paper machine dryers running up to 6500 fpm 2000 mpm and is engineered to integrate with the dryer drainage system
The task for the dryer section is to remove water from the paper web by evaporation typical methods for paper or board drying are multicylinder drying or air drying regardless of the selected drying method it is vital to ensure maximum drying efficiency with minimum energy consumption valmets dryer sections feature optimized steam consumption with effective ventilation and heat recovery for
Paper machine dryer section even after passing the paper from entire press section paper remains still wet hence it requires to eliminate remaining water which can only be done through the application of heat this is carried out by paper machine drying section consist of a series of steam heated cylinders varying in diameter
On a paper machine drying is accomplished by passing the web around a series of steamheated cylinders there are about 40 to 70 dryer cylinders on a typical paper machines and this is by far the largest part of a papermachine drying page 5 the dryer cylinders are grouped in sections having 8er 10 dry cylinders
The following are best practices for paper dryer operations dryer bars improve drying uniformity and increase drying capacity of dryerlimited machines and thereby either increase production or decrease operating steam pressures bars should be installed in dryers
The purpose of a paper machine steam and condensate system is to control steam pressures for optimum drying provide stable control over the entire operating range and efficiently remove condensate from inside the dryers the comments below are a collection of performance tips for keeping your sampc system up amp running at maximum capacity
If the dryer section is heated or cooled too quickly damage can occur to the dryer can steam joints bearings etc a general warmup procedure goes something like this verify that the lubrication oil supply is on for all dryer can and felt roll bearings start by adding
