Duplex Coated Board Production Plant
Raw material: Wood pulp, white shavings, waste paper, paper board etc.
Finished paper: Duplex coated paper board
Leizhan supply: Whole duplex coated board paper production plant contains stock preparation system and paper manufacturing machine
Stock Preparation System
Pulping:
Drum pulper: Mainly used for continuous gentle pulping and coarse screening of waste paper under high consistency.
Cleaning:
High density cleaner: Mainly applied to remove all kinds of heavy impurities in paper pulp, like steples, stones, glasses, etc.
Low density cleaner: Mainly used for removing heavy impurities in the pulp like gravel, scrap iron, dust and large ink particles.
Screening:
M.C. pressure screen: Mainly used for coarse and fine screening of various waste paper pulp.
Single effect fiber separator: Mainly used for secondary breaking and screening of waste paper pulp.
Reject separator: Used for fiber relief and impurities separate for tailing in the coarse screen system for waste paper pulp.
Inflow pressure screen: Inflow structure, low pulse, good effect of homogenate.
Pulp refining:
Double disc refiner: Used for beating and improve the beating degree of pulp to satisfy the papermaking demand.
Paper Manufacturing Line
1. Forming section
Stock will be distributed evenly on the forming part of paper machine with headbox. The water will be greatly squeezed out and paper sheet will be formmed.
2. Pressing
As the paper sheet enters the press section it is still quite wet. Considerable amounts of water may be removed at the pressing part.
3. Sizing
The permeability of paper to liquids, such as water, writing inks etc, is very important property.
4. Drying
The sheet, as it passes from the press section, should be as dry as possible so that it can be made mechanically. From this point it is necessary to apply heat in order to reach the desired state of dryness. The most usual method of drying uses steam-heated dryers.
5. Calendering
As the sheet undergoes the drying process there is a tendency for the fibers to lift slightly, it is passed through a stack of heavy metal rolls where it is calendered under high pressure. The purpose of calender stack is to compress the sheet and give it a fine smooth finish.
6. Reeling
Paper making is a continuous process from the headbox to the calender. After the sheet leaves the calender it must be put into a form that can be easily transported and handled. The first step in this process is to wind the sheet on a reel, then the large roll taken from the reel must be slit and trimmed on winder into the size required by converting and customer.
