SU1285095A1 - Head box of paper-making machine - Google Patents

Abstract

This invention relates to a paper machine design and can be used in the pulp and paper industry. The purpose of the invention is to improve the quality of the cast sheet by making it possible to control the level of microturbulence flow. The pressure box has a housing 1 and an inlet device 2 with a stepped lower lip 3 consisting of sections 5, which are divided in the transverse direction into elements movable in the vertical direction. This makes it possible to regulate the degree of microturbulence of the flow, which in turn affects the quality of the cast sheet. 3 il. (L

Description

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The invention relates to the design of a paper machine and can be used in the pulp and paper industry.

The purpose of the invention is to improve the quality of the cast sheet by making it possible to control the level of microturbulence flow.

Figure 1 shows the pressure box, transverse section} in figure 2 - node 1 in figure 1; FIG. 3 is a section layout scheme.

The pressure box includes a housing 1, an inlet device 2. A step lower lip 3 consists of a series of downwardly decreasing in the mass direction sections 5, which form a stepped-tapering slit with the upper lip. The sections 5 are made across the width of the slit of movable elements 6, each of which is connected to a corresponding mechanism for moving it along the height of the slit, made, for example, in the form of rods 7. The pins 8 prevent the rods 7 from unscrewing. In the body of the lower lip 3 you have:; there are holes with thread 9, of the same name with rods of rods 7. The latter are equipped with handwheels or connected to a drive of rotational motion. Geometrical dimensions of section 5, their number, range of adjustment depend on the speed of the machine, type and concentration of paper masses. The number of elements 6 is determined by the width of the case 1 of the headbox, the type of flow distribution system.

The headbox works as follows about “5th rate.

The paper mass fed into the box 1 of the headbox enters the inlet device 2. The mass flow flows around the sections 5 of the lower lip 3, while microturbulent vortices form in the mass flow due to the re-50 ° of the web due to the drop in heights formed by sections 5 The ability to control the level of micro-microturbulent swirls ensuring flow turbulence, the bottom section

effective hair-lip dispersion is made across the width of the outlet

Kon, their disorientation, which entails latches of individual elements, each with a uniform distribution of wills, of which has its mechanism in the structure of the paper web, along the height of the slit.

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When the rods 7 are rotated, for example, manually or by means of a rotary motion drive, the position of the sections 5 changes, resulting in a change in the scale of microturbulence, i.e. to adjust the dispersing effect on the flow of paper pulp when the speed of the machine, concentration and product type.

When one of the rods 7 rotates, the position of the corresponding element 6 of the section 5 changes, thus achieving the adjustment of the dispersing effect on the pulp flow across the width of the case I of the headbox. The flow is also equalized in speed and concentration along the width of the case 1 of the headbox, which leads to an increase in the quality of the cast sheet.

The use of the proposed pressure box makes it possible to significantly improve the quality of the casting sheet by creating a microturbulence level by adjusting the position of sections 5, which is necessary for efficient dispersion and disorientation of the fibers in the pulp flow, as well as by equalizing the speed and concentration along the syringe pressure. boxman. All this leads to a more uniform distribution of fibers in the structure of the cast sheet, 5 i.e. to a more uniform mass distribution of 1 m of paper web.

Claims (1)

Invention Formula The press box of the paper machine, comprising a housing and an inlet, a device with a stepped lower lip, consisting of a series of successively installed, lowering in the direction of movement of the mass flow, sections forming the upper lip of a stepwise tapering discharge slot, characterized in that the purpose of quality is cast0 five 0 Fig .. 2 Fig.Z