Multi-layer Headbox technology can also be used to form starch, mild and smooth rods measuring membrane pressing combined with surface sizing, as part of a recovery on the strength characteristics of surface sizing out of a way. If the increase in surface sizing of paper moisture content, can also save a lot of energy. Combination of large drying capacity is required to remove final moisture in the paper, another way that may reduce the need for drying capacity is increased by reducing the viscosity of starch solution starch adhesive materials of solid content.

1 Historical background and development of sizing machines

Sizing machine is a high degree of specialization of paper machines , early box- type, shed type two, after the mid-1980s , developed by West Germany developed a series of centrifugal BS sizing machine, became the most successful , the latest generation of sizing equipment , widely popular in foreign countries , quickly replaced the old box , shed -type sizing machine , it changes the fundamental way of sizing . Sizing greatly improved the quality and production efficiency, and reduced equipment size . Mid-eighties, the introduction of the device , but also tested and imitation , and soon got a promotion, so far , the products in China has been widely used. Ring sizing machine compared with the previous legacy sizing machine , there are indeed incomparable superiority , so it one available, it has been widely used.And is currently widely used transfer roller sizing machine and reverse roll size press , the latter in the horizontal and inclined Two -column sizing machine , especially favored because reversing roller type sizing machine the use of more advanced technology , speed, sizing machines span a wide range of applications , virtually no restrictions on plastic materials, sizing machines are versatile . Echelon type sizing machine which consists of a pair of sizing rollers are arranged horizontally constituted , it works for the finished surface of the paper web through the emulsion glue sizing machine continuous, uniform and stable coated on a paper surface , after number of physical effects infiltration , infiltration, extrusion , sheet forming a surface layer of thin waterproof layer of paper greatly improved resistance to water absorption , while increasing the bonding strength between the fibers under the action of the glue and tightness of the paper, thereby increasing the lateral ring crush index of paper , breaking length portrait items of technical indicators. Not only simple structure , and higher efficiency. Until now , most of the size press are committed to the development of technology to solve mechanical problems. High efficiency, high quality , low investment and low energy demand has become the driving force for the development of the size press technology. To further improve the size press technology, the requirements set new goals to improve paper production efficiency and competitiveness . Equipment manufacturers continue to develop new measurement techniques and ensure good process stability ( even at high speeds ) technology. In order to get a stable condition , but also requires the development of new measurement techniques and has a low circulation rate required more compact device. Finally, the paper and cardboard requirements are changed. Paper quantitative reduction will increase the importance of surface treatment processes. Meanwhile , to improve the sizing of the maintenance and improvement of the coverage quality is very important.

1.1 Horizontal sizing machine

Paper vertically into two horizontal rollers can only be one-sided glue , machine speed is not high, but the simple device structure is inefficient compared glue evenly distributed , easy to cause breakage .

1.2 Echelon type sizing machine

Echelon type has the advantage of horizontal and vertical sizing machines , can rely on the weight of rubber in the sizing process, to make the plastic material as possible into the paper , glue on both sides simultaneously , greatly improving efficiency.