2.1.1 deflection roller body with roll diameter choice

Direct contact with the size press roll sheet , and therefore the roller should not be too high Large, otherwise it will affect the distribution of the glue and sizing effect.From the round and in high demand roller roller diameter series to determine the sizing Roller outer diameter of 965mm, the outer diameter of the sizing rolls 1265mm. Operation line pressure 40kN /m when ( recommended value ) , the sizing rolls high as 0.35mm, sizing rolls under high Degree 0.45ram, the line pressure and the relationship between the height shown in Figure 2.1.1

 Figure 2.1.1 working pressure and limit the height of table

2.2 heated device 

Rollers at high speed with a line pressure when the well. Elastic deformation of the plastic surface and out of the nip. Causing gum Surface temperatures continue to rise, causing the plastic surface aging, reduce package The life of the layer, while the surface temperature of the rubber 1j temperature difference between the roll body becomes water absorption increases. Thus swallow air from the roll surface water infiltration, condensation caused Rubber layer peeling. For the sizing of the rubber roller surface layer The use of long-term stability, Circulating through the upper and lower rollers are internally heated, well that end with a special heated devices. This unit is in heating water storage tank Steaming, through the control valve of the water temperature controlled at 25-45 ℃, by the pump Withdrawn into the cooler, through the control valve to adjust the flow of water into the facilities to adjust Cots in water temperature, water temperature control at 35'C t monitoring water tank level transmitter by Bit. Adjust the control valve into the water so that the water level in the tank to maintain a balance. Warm water from the cooler Came out together along with the compressed air from the operating side of the roller shaft head into the interior roll Proliferation, warm water discharged from the absorption of heat transmission through the drain side continues to return temperature Means for circulating water used (see Figure 2.2), and the temperature of the roller surface temperature remained a gum To (difference 5 ~ 10 "C), the amount of water required for each roller 60L/min.

 Figure 2.2 hot water turough the rollers

2.3 arc roller device 

Is the configuration of a conventional design and a curved guide roller nip behind sizing Roller, then lower after re-entering the web bake two chrome-plated cylinder temperature t set the machine Meter is appropriate to improve the design elevation, the nip in the sizing guide roll only after eliminating A curving rollers, so that the structure is more simple and more compact rear drying unit interface. After applying the surface moisture absorbed limb swelling the fibers swell and sheet set Curved sheet tension roller can compensate, causing wrinkles and prevent calender breaks. Through After going through the first stretch rollers can only dryer sheet has a uniform tension, curved roller Chrome plated, non-stick surface allows the sheet. After sizing after entering the dryer section of the paper to be precise tension control, otherwise inflation Tension is too tight on a big sheet of paper. Can adversely affect the physical strength properties. Zhang Force is too loose can cause fold. Wrinkling and edge wrinkling, so the best curved roller shaft Order of the seat attachment load sensor for measuring the size press out sheet tension.

2.4 pressure device

Pneumatic compression device consists of a pneumatic tire imports , pressure arm , pins and bushings and other components ( see Figure 2.4(1) ) , working pressure 0.4MPa, the maximum working pressure line 60kN / m. Recommended Operating Line Pressure 40kN / m, the relationship between the pressure and the air pressure line(see Figure 2.4(2)) . In order to improve the sizing effect ,Reduce the pressure side, so when sizing rollers operating side pressure , the drive side can simultaneously contact roller Body , pressed from the start when the open position , the proximity switch on the next roll and glue sizing Roll gap is 5 ~ 10ram position signaled to the PLC manual pressurization ,Under sizing rolls slowly approaching the sizing rollers to avoid damage to glue sizing rollers . 施涂机英文文献和中文翻译(4):http://www.751com.cn/fanyi/lunwen_53234.html