Elements to consider when purchasing Double Facer
Double facer is an important single machine in corrugated board production line. The main function of the double facer (also known as the heating Laminating Machine) is to bond the single-sided corrugated board and the face paper, heat and solidify it, cool it after drying to form a high-quality three-layer, five layer or seven layer corrugated board, and then transfer the corrugated board to the longitudinal cutting indentation machine and other equipment for cutting and processing the board.
The double facer is the last part of the wet part of the corrugated cardboard production line. Its is to complete the final adhesion of the cardboard and the production of flat cardboard. Cardboard out from the double facer whether in the longitudinal or horizontal are stiff and flat, this cardboard is the raw material for the manufacture of cartons.
The double facer consists of hot and cold sections.The heating section is composed of several groups of heat oven with out surface. Corrugated board is directly attached to it. On the upper plane of corrugated board, there are special canvas belts, corrugating roll or pressure plates with good air permeability, certain tension and gravity, so that corrugated board is heated and dried under certain pressure.Heating section is divided into high temperature zone and low temperature zone, high temperature zone makes the adhesive gelatinization, drying, enhance adhesion.Low temperature area makes corrugated board dry and tend to be stable.The of the cooling section is to dissipate excess heat, evenly distribute water, avoid warping, so that corrugated board into the next process after leveling and shaping.
To sum up, the functions of the double facer need to meet the following requirements:
1.More heat storage and stable temperature;
2.Flute as far as possible to maintain no loss;
3. Low energy consumption;
4. Easy to clean.(Cotton belt cleaning &heating system)
When paper packaging manufactures purchase double facer, they need to consider the following aspects:
1.The choice of pressure plate: pressure plate has three forms: pressure roller, contact pressure plate, air bag pressure plate.
2.Heat transfer, mainly consider heating exchange evenly.
3.Automatic correction mode.
4. Install quality and prevent deformation of hot plate.
5. Mirror treatment of hot plate when necessary.
6.The pressure roller is equipped with a power system to adjust the height so as to meet the requirements Corrugated Line for different thicknesses of cardboard.
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