What is the function of Paper Machine VAC Cylinder
2026-05-26
1、 Core functions (in one sentence)
Strong vacuum dehydration: The roller surface is densely covered with small holes, and the internal vacuum box (-30~-70 kPa) sucks wet paper moisture into the roller through a mesh/blanket and discharges it. The dryness is increased from 12% -18% to 20% -27%, greatly reducing the pressing/drying load and steam consumption.
Smooth transfer of paper web (paper guiding): At the end of the net (vacuum pressure roller) or the pressing section (vacuum pressing roller), wet paper is sucked in by vacuum and smoothly transferred from the forming net to the pressing blanket, without deviation or wrinkles at high speed.
Improving paper quality: uniform dehydration, reducing mesh marks/indentations, enhancing banner moisture uniformity and surface smoothness.
Supporting forming mesh/press blanket: As a key support roller, it ensures stable tension and smooth operation of the mesh/blanket, reducing shaking and wear.
2、 Common types and locations
Couch Roll: The last roller in the mesh section, which is used for dewatering, paper feeding, and pressing, resulting in the most significant improvement in dryness.
Vacuum Pickup Roll: Between the net and the pressing or squeezing section, pure paper is drawn and slightly dehydrated to prevent paper breakage.
Vacuum Press Roll: In the pressing section, the press zone undergoes strong dehydration, resulting in a 2% -4% higher dryness compared to regular pressing and reducing moisture regain.
3、 Working principle (minimalism)
Drill thousands of small holes on the roller shell (stainless steel) → fix the vacuum box internally (sealed in zones) → evacuate → allow moisture to penetrate the mesh/blanket → small holes → vacuum box → discharge white water; The roller shell rotates and the vacuum box is fixed, generating suction only in the set arc segment.
4、 Value of production
Speed up: A high-speed paper machine (≥ 1000 m/min) is essential, otherwise stable paper feeding cannot be achieved.
Energy saving: 1% dryness per liter reduces drying steam consumption by about 4%.
Quality improvement: Reduce paper breakage, wrinkles, and holes, and improve product yield.
Strong vacuum dehydration: The roller surface is densely covered with small holes, and the internal vacuum box (-30~-70 kPa) sucks wet paper moisture into the roller through a mesh/blanket and discharges it. The dryness is increased from 12% -18% to 20% -27%, greatly reducing the pressing/drying load and steam consumption.
Smooth transfer of paper web (paper guiding): At the end of the net (vacuum pressure roller) or the pressing section (vacuum pressing roller), wet paper is sucked in by vacuum and smoothly transferred from the forming net to the pressing blanket, without deviation or wrinkles at high speed.
Improving paper quality: uniform dehydration, reducing mesh marks/indentations, enhancing banner moisture uniformity and surface smoothness.
Supporting forming mesh/press blanket: As a key support roller, it ensures stable tension and smooth operation of the mesh/blanket, reducing shaking and wear.
2、 Common types and locations
Couch Roll: The last roller in the mesh section, which is used for dewatering, paper feeding, and pressing, resulting in the most significant improvement in dryness.
Vacuum Pickup Roll: Between the net and the pressing or squeezing section, pure paper is drawn and slightly dehydrated to prevent paper breakage.
Vacuum Press Roll: In the pressing section, the press zone undergoes strong dehydration, resulting in a 2% -4% higher dryness compared to regular pressing and reducing moisture regain.
3、 Working principle (minimalism)
Drill thousands of small holes on the roller shell (stainless steel) → fix the vacuum box internally (sealed in zones) → evacuate → allow moisture to penetrate the mesh/blanket → small holes → vacuum box → discharge white water; The roller shell rotates and the vacuum box is fixed, generating suction only in the set arc segment.
4、 Value of production
Speed up: A high-speed paper machine (≥ 1000 m/min) is essential, otherwise stable paper feeding cannot be achieved.
Energy saving: 1% dryness per liter reduces drying steam consumption by about 4%.
Quality improvement: Reduce paper breakage, wrinkles, and holes, and improve product yield.
