Coated white cardboard paper making line include two parts: paper pulp making line and paper making line. So, a complete paper industry must contain paper pulp machines and paper machine.

The raw materials of coated white cardboard paper are good waste packing box, American waste paper, waste office paper, white shavings and so on, and need another pulp--white shavings for top layer pulp.

Coated White Cardboard Paper Pulp Making Line

1. Pulping

Waste papers are conveyed by chain conveyor into the hydrapulper(You can choose D-type hydrapulper, Drum pulper or M.C. Hydrapupler according to your request)for pulping. Due to the Corrugated white cardboard paper is more complicate than Kraft paper and corrugated paper, so, it need more than one hydapulper to graving kinds of raw materials.

2. Screening

Kinds of stock pulp will enter a series screening equipment（such as pressure screen,vibrating screen etc.) to remove impurities. In most instances, it is the size of perforations(usually holes and slots) that determine the minimum size of debris that will be removed.

3. Cleaning

High Density Cleaner, Low Density Cleaner

4. Refining

Double Disc Refiner, Conical Refiner

Coated White Cardboard Paper Making Line

1.Formatting of paper sheet

The paper will be formed from stock pulp on a cylinder machine(one parts of paper machine), the paper will be removed the water as far as possible and carried onto the wire for sheet formation.

2.Pressing

As the Coated white cardboard paper sheet enters the press section it is still quite wet. Considerable amounts of water may be removed by the pressing and suction extered by the press 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 and Winding

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.

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Leizhan is a professional manufacturer of pulping & paper making equipments. If you are interested in any of our products, please feel free to contact us for further details.