SU1761480A1 - Production line for manufacturing fibrous plates from fibrous suspension - Google Patents

Abstract

SUMMARY OF THE INVENTION: A line for the manufacture of fiber plates from a fiber suspension contains a pulp preparation unit, a mechanism for preliminary dewatering the mass in the form of a horizontal net conveyor, a carpet molding unit in the form of converging vacuum molding conveyors, a carpet pressing unit in the form of two conveyors, a drying unit and cutting device. The working branches of the conveyors form a gap for the passage of the formed carpet. The conveyors of the carpet pressing unit are mesh. Their working branches are set at an angle of 1-6 ° to each other, and plates are installed parallel to the working branches inside the conveyors. 1 il. (Ls

Description

The invention relates to equipment for the production of fiber boards, in particular to the production of fiber plates from an osprey of cardboard and paper production, and can be used in the pulp and paper industry and the building materials industry.

It is known the use of osprey cardboard paper production in the production of fiber boards.

Until recently, the production of plates from an osprey of cardboard and paper production was carried out on apparatus of periodic action. The process is characterized by low productivity. In addition, the skop contains a large amount of filler, is characterized by low adhesion forces between the fibers, so the formation of the plate from the osprey requires careful management to prevent the plate from being crushed.

A known installation for the removal of fibrous plates from sewage sludge, including a pressure box, followed by a chute, bounded below by an infinite

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mesh. Moving along the chute, the mass is dewatered by means of a rolling sucker and then enters a wedge-shaped gap formed by two grids where the main dehydration occurs. At the end of the machine there are three two-shaft high-pressure presses,

The main disadvantage of this design is that the high pressure in the last presses adversely affects the quality of the plates, violating the integrity of their surface, which leads to a decrease in the strength of the plates.

The closest to the technical essence is a flow line for the manufacture of fiber plates, containing a pulp preparation unit, a thickening unit made in the form of an aggregate with vertically placed vacuum forming conveyors, a carpet pressing unit in the form of two conveyors, working branches which form a gap for the passage of the molded carpet. Inside the conveyors, a series of calibration rollers are installed which are in contact with the working branches of the conveyors. The continuous line is also equipped with a cutting device and a drying unit. The production line is intended for the manufacture of heat insulating plates from mineral fibers and a binder, and its drawback is limited technological capabilities (the line works efficiently only if mineral fibers are used as raw materials that are close to mineral ones in their ability to give water during the molding and carpet pressing). If, however, such a dehydrating product as an osprey of cardboard and papermaking is used as a starting material, plates with a high degree of moisture come into drying and the plates are cracked during the drying process, which reduces their consumer properties. The bottleneck here is a pressing unit made in the form of two rows of calibration rollers, covered by transporting belts, between which a molded carpet occurs. An extrusion unit of this design does not provide the required degree of dryness of the carpet formed from an osprey of cardboard and paper production; practically, the carpet is pressed and calibrated; the number of calibration rollers, which naturally leads to the complexity of the design, since each roller must have an adjustable clamping mechanism.

The purpose of the invention is the expansion of technological capabilities.

This is achieved by the fact that in the production line, which includes the pulp preparation unit, a mechanism for pre-dewatering the mass in

0 as a horizontal net conveyor, a carpet molding unit of converging vacuum forming conveyors, a carpet compression unit in the form of two conveyors, the working branches of which form a gap

5 for the passage of the molded carpet, the drying unit and the cutting device, the conveyors of the carpet pressing unit are made of mesh, their working branches are set at an angle of 1-6 ° to each other, and inside the conveyors, perforated plates are installed parallel to the working branches. Such an embodiment of the extrusion unit allows for efficient dewatering of a fibrous carpet to a dryness of 22-28%, made from an osprey of paper and paper industry, which will make it possible to obtain plates that meet the requirements of the national economy.

The drawing shows a schematic flow line.

The flow line consists of a fiber suspension preparation unit 1, a mechanism 2 for pre-thickening of the mass, a device 3 for forming a fibrous carpet, a mechanism 4 for pressing

5 of a carpet consisting of two mesh conveyors 5, perforated plates 6, a device 7 for adjusting the angle between the plates, an assembly 8 for cutting an endless carpet into webs of specified sizes, 0 clone conveyor 9 for placing wet plates on pallets 10, a loading conveyor 11, a loading shelves 12, hydraulic multi-storey press 13, discharge shelf 14, discharge

5 conveyor 15, the re-detachable device 16, the conveyor 17, the cutting unit plates 18, the conveyor system 19 return the pallet to the left.

Flow line works as follows.

0 Osprey from the sewage treatment plant is fed to the pulp suspension preparation unit 1, where it is mixed with other pulp and paper industry waste (sawdust, cellulose sorting waste, waste paper, timber, etc.) and

5 functional additives (for example, water-repellent), with a mass fraction of 2.5-3.5% of the fiber, are fed into the inlet device of mechanism 2. The fibrous mass is poured in an even layer onto an endless

The mesh transporter, part of the water that has flowed through the mesh, is collected in the tank of circulating water, and the mass, dried up to 4-5%, is dumped into a vertical device 3 formed by two mesh conveyors covering the suction boxes. In the upper part of the device, under the influence of hydrostatic and mechanical pressures, the liquid phase of the suspension through the movable grids of the conveyors and the perforated surface of the boxes is by gravity diverted into the tank of circulating water, and on the grids begin to form layers of fibers that, moving downward, converge and form fiber carpet. In the lower part of the device to intensify the dewatering process, the removal of the filtrate is forced by means of a double-sided vacuum.

The molded fiber carpet with a mass fraction of 15-20% is transferred to a horizontal section, where it is subjected to additional dehydration and pressing to dryness by 22-28% in mechanism 4. The molded and pressed laminated carpet is fed to an aggregate 8, where the fabric is cut to a predetermined size, defined by the dimensions heating plates press. Wet plates using an inclined conveyor 9 are placed on metal sheets (pallets) 10 and conveyor 11 is fed into the loading shelf 12 and further to a multi-floor hydraulic press 13, where the final dewatering and drying of the plates under a pressure of 0.5-2.5 MPa, temperature of 150-200 ° C for 20-60 minutes.

The dried plates enter the discharge rack 14 and further along the conveyor 15 into the re-detachable device 16, where the separation of the plates and pallets takes place. Plates -

step on the cutting format, and pallets of the system 19 conveyors returned to production.

On this device, fibrous plates were obtained from an osprey of cardboard and paper production, the main characteristics of which meet the requirements of the national economy:

Density, kg / m

500-900

Flexural strength, MPa 8-18 The use of the invention in folk economy allows:

-solve the question of recycling osprey cardboard and paper production;

- reduce transportation costs associated with transporting the osprey to a landfill;

-organize the production of scarce building material.

Claims (1)

Formula of the Invention The production line for the manufacture of fiber boards from a fiber suspension, containing a pulp preparation unit, a preliminary mass dewatering mechanism in the form of a horizontal net conveyor, a carpet molding unit in the form of converging vacuum forming conveyors, a carpet compression unit in the form of two conveyors, the working branches of which form a gap for the passage of the molded carpet, a drying unit and a cutting device, characterized in that, in order to expand technologically possibilities, transporters mat pressing unit formed mesh, their operating branches are angled to each other 1-6 °, and in parallel to work branch conveyors m are provided with perforated plates.