SU1002438A1 - Head box wire section of paper-making machine - Google Patents

Description

The invention relates to the pulp and paper industry, namely to the pressure boxes of paper machines.

Known pressure box, which improves the uniform distribution of fibers in the flow structure of a fibrous suspension by microturbulent turbulence sr; xn miturbulators installed in the area of the pressure box immediately preceding the inlet of the mass on the grid table 11 3 "

However, such pressure boxes do not provide the required degree of microturbulence in the zone where rapid dehydration and formation of the paper web structure occur, i.e. on the net table. In addition, the structure of the flow of the fibrous suspension supplied from the portable porous box undergoes significant changes when interacting with the structural elements of the grid table, such as the anisotropy of the web, the re-flocculation of the cross jets, etc., which worsen the structure of the cast canvas, and hence the quality of the paper.

The prototype of the invention according to the technical nature is the press box of the paper machine, comprising a body and an inlet with an upper lip located above the forming inclined towards it and forming a web forming zone with the lower lip. Some uniform distribution of the fibers is achieved by partially eroding the structure of the paper adjacent to the net, when it runs onto the openings of the covers of the suction boxes placed under the net in the forming area of the web 2.

The use of the machine stretched along the mesh and the flat upper lip adjoining it does not provide the required dispersing effect on the so-cling suspension located in the dewatering and shaping zone and does not allow controlling the degree of dispersion of the fiber suspension.

25 consequently improve the quality of products.

The aim of the invention is to improve the quality of the molded web due to the deflocculation of the mass in the forming zone.

The goal is achieved in that the press box of the paper machine, the housing and the inlet device with an upper lip, located on the form of a net, is tilted to it and forming the web forming zone with the lower lip, has hollow perforated shear urine stabilizers with an elastic sheath in the web forming area an ellipsoidal cross section; 10, provided with nozzles for supplying the pressure agent through the perforations into the cavity of the elastic sheath.

FIG. 1 shows the pressure box;) general view; in fig. 2, section A-A 15 in FIG.

The press box of the paper machine contains body 1, mass supply 2, body 1 is provided with an inlet device with an elongated .20 along the machine grid and the adjacent lip 3 adjacent to it, forming with the lower lip 4 a web forming area 5. Hollow rods are installed in the web forming area 5 -turbus-6 lysers 6 with elastic sheath 7 of ellipsoidal cross section. The elastic sheath is connected through a pipe (not shown) with a line for supplying agent. Pressure 8 by means of holes 9 of a hollow rod-turbulator B. The wiper with n-turbulators 6 is fixed in the side walls 10 of the inlet with the help of nuts 11. Grid 12 located-above permeable lids 13, connected to the suction pins 14.

Headbox works as follows.

When the machine is in operation, fiber suspension 40 flows from the case 1 of the headbox into the forming zone. Cloth 5, brazovaya 1 stretched along the mesh of the machine and the upper lip-3 and the lower lip 45 adjacent to it. 4. Mass flows, obt. the surface of the turbulism rods 6, form microturbulence vortices that disperse the fibrous mass in the zone of dewatering and spinning the fabric, thereby contributing to a more uniform distribution of fibers in the structure of molded paper pulp Decrease or magnification of gi; phydynamic resistance in a forming zone: continuous 5, respectively, decreasing or increasing the scale of turbulence

This is due to the fact that the bifurcate holders are made hollow with an elastic sheath 7 of ellipsoidal cross section, which allows changing the geometrical parameters of the rods b turbulators b by feeding the pressure agent into the cavity of the elastic sheath 7 /

Each paper pulp with its working concentration, composition and degree of grinding requires a certain range of microturbulence in the zone of dehydration and molding of paper stock, which ensures the most effective dispersion of it. Therefore, the intensity and scale of the generated microturbulence depends on the geometrical parameters of the rods-turbulators 6.

The use of the proposed headbox will significantly improve the quality of the cast sheet due to the intensive deflocculation of the paper pulp in the dewatering and forming zone, and will effectively control the degree of dispersion depending on the modes of casting of a particular type of paper pulp. Thereby, an optimum dewatering and shaping of paper pulp is achieved, which makes it possible to obtain high quality paper with a uniform mass distribution of 1 m - this important indicator in the production of paper.

Forglula Invention

The paper machine's pressure box, comprising a housing and an inlet device with an upper tube positioned obliquely above the forming fabric, towards it and forming a web forming zone with the lower lip, characterized in that, in order to improve the quality of the molded web due to deflocation of the mass in the molding area , it has hollow perforated turbulent rods with an elastic shell with an ellipsoidal cross section / fitted with branch pipes for feeding the pressure agent through the perforations. w in the cavity of the elastic shell.

Sources of information taken into account in the examination

1. Author's certificate of the USSR 452642, cl. D 21 F 1/02, 1974.

2. Patent of the USSR No. 375857,

cl. D il F 1/02, 1968 (prototype). ff 7S Fe / f.f

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Claims (1)

Forglula inventions The headbox of the paper machine, comprising a housing and an inlet device with the upper lip inclined above the forming net, forming a web forming zone with the lower lip, characterized in that, in order to improve the quality of the molded web by deflocculating the mass in the forming zone, it has hollow perforated turbulator rods installed in the web forming zone with an elastic shell of an ellipsoidal cross-section, equipped with nozzles for supplying a pressure agent through perforations elastic sheath into the cavity.