SU686898A1 - Line for making wooden plates - Google Patents

Description

(54) LINE FOR THE MANUFACTURE OF THE TREE PLATES

I

The invention relates to the production of building materials, more specifically to lines for the manufacture of wood-based panels by hot pressing and can be used in the woodworking industry.

The known chipboard production line includes a machine for forming chip briquettes, a press for pre-compaction of briquettes, a multi-storey hot press with loading and unloading shelves, a conveyor system for moving briquettes, transport metal sheets and manufactured plates l.

The disadvantages of such a line are its low productivity and the instability of the quality of the plates, due to the long aging of the briquettes in a hot press and the different holding times of the fixes in the loading shelf.

Another known line for the manufacture of chipboard, containing a masque for forming briquettes nz

a wood-press press, a device for preheating briquettes on high-frequency lO-SO C currents, a press for pre-compaction of briquettes, a multi-story hot-pressing press with loading and unloading shelves and a conveyor belt with transport sheets 2,

The disadvantage of this line is the instability of the quality of the sheets due to the different intensity of drying of the wicks during their stay in the loading shelf.

The purpose of the invention is to increase the productivity and quality of wood-based panels.

This is achieved by the fact that the line contains a psychro-thermal chamber installed in front of the hot press, in which the loading shelf is placed, and a device for heating the briquettes is installed after the press to pre-compact them.

Claims (2)

FIG. 1 is a schematic diagram of a line for the manufacture of wood-based panels; in fig. 2 - line section with 3 .lyaoHiOH E1 zhorki, psnkhro-thermal camera and hot press, longitudinal section; n FIG. 3 - psychro-thermal camera and rear shelf, transverse cutting. The line for the manufacture of wood-based panels includes a machine 1 for forming briquettes from wood molding, a press 2 for pre-compaction of briquettes, a device for heating briquettes 3, a psychro-thermal chamber 4, a loading shelf 5, a multi-storey press 6 for hot pressing, an unloading shelf 7, conveyors 8 for transporting metal sheets, briquettes and finished plates. The psych-thermal chamber 4 has heat-insulated walls 9 and a ceiling 1O (Fig. 2). The front wall of chamber 4 (the sides of the press 6) is a movable plate 11, mounted on the lower cross bar of the press 6, and a fixed shield 12; at the site of hot working plates, the press of the 6th stack is missing. The required humidity-temperature conditions in chamber 4 are created and maintained using a system of known automatic control and regulating devices (electrical contact psychometers and thermometers) and working devices for humidifying and heating air (electromechanical water spray and electric heaters) that are not shown in the drawings. . The uniform distribution of temperature and relative humidity of air inside chamber 4 is ensured by its circulation at a speed of 0.1-1 m / sec from a separate fan and switchgear, or by means of special relaxation of the working devices for the rest of the air. It is natural to ventilate the chamber 4 through the opening 13, the opening of which is regulated by a flap .14. Glazed opening windows 15 are provided on the side walls of the chamber 4. The briquettes are fed into the loading shelf 5 through the opening 16 of the chamber 4 with a folding curtain. 17 from a polyethylene film or some kind of cloth. In chamber 4 a loader 18 of briquettes is mounted from loading stand 5 to press 6. Vertical movement of loading stand 5 is carried out from hydraulic cylinders 19 along the guides 20 of the frame of this stack. 9 8.4 Lines dl.: Ich,) then l (.. pi drolH1b1; plates works with; ice and in the same way. Drafing chips, saw; 1shni with a binder, is loaded into the machine 1, which forms from this press mass briquettes on metal transport sheets installed on the conveyor 8. Then the briquettes on the transport sheets by the conveyor 8 are fed into the press 2 for their pre-compaction, from where the pressed briquettes enter the fixture 3, where they are heated up to 30-110 C. The temperature of the preheating should be below the intensive polymerization temperature communicate From the device 3, the briquettes on the conveyor sheets by the conveyor 8 are fed into the psychro-thermal chamber 4 through the opening 16 and placed in the loading shelf 5. The chamber 4 is maintained at an air temperature equal to or close to the temperature to which the briquettes were heated in relative humidity of the air - equilibrium with respect to the humidity of the outer layers of briquettes. For example, when the humidity of the outer layers of the briquette is 14%, the equilibrium humidity of the air will be about 80%. This allows you to maintain the original temperature and humidity of all the briquettes in the loading shelf 5. After loading the shelf with 5 briquettes, press 6 is loaded with the help of loader 18. Monitoring the filling of the loading shelf 5 and loading of the press 6, as well as technological maintenance of the loading shelf 5, is performed through the windows 15 of the chamber: 4. After zaguing the press with 6 briquettes and closing its working plates, having a temperature of 140 180С, contacting the wet outer surface of the briquettes with hot plates ECCA leads to rapid evaporation of moisture from Nara GOVERNMENTAL layers and penetration of superheated steam formed inside the preform. Thus, the entire mass of each briquette in the press 6 is rapidly heated and the briquette binder is intensively polymerized. At the end of the pressing process, the press plates 6 are opened, the loader 18 pushes the next transport sheets with briquettes into the press 6c of the loading stand 5, and the transport sheets are pushed out with their front edge from the press 6, pressed plates to the unloading shelf 7, From the shelf 7, wood plates are fed-f to the conveyor 8, .and then to the warehouse or to dalted processing according to the specified technological process. In the proposed line, thanks to the use of the psychro-thermal chamber 4, optimal conditions are created for pressing the briquettes in the hot press 6 by preheating the briquettes in the fixture 3 to a relatively HIGH temperature, the same temperature and humidity of all the briquettes when loading them into the press 6 regardless of the exposure time them in the loading stand 5. Thus, the pressing cycle in a hot press, for example, plates with a thickness of 18–20 mm can be shortened to 35 minutes (instead of 5–7 minutes), which increases productivity and 10 -50% and improves the quality of the wood produced. Formula of the invention: A line for the manufacture of wood-based panels, comprising a machine for forming / 82 / H A 13 ii J-. t I no briquettes from wood press mass, a press for pre-compaction of briquettes, a device for heating briquettes, a multi-storey press of hot pressing, loading and unloading shelves and a conveyor belt with transport sheets, in order to increase productivity and quality boards, the line contains a psychro-thermal chamber installed before the hot press, in which the loading shelf is placed, and a device for preheating the briquettes is installed after the press for preliminary their seals. Sources of information taken into account in the examination 1. GM Schwarzman et al. Technologists,. ijartsman i. v ,. „Other technology. basic principles of chipboard production automation. - M 1976, p. 232. 2. Accepted for the Federal Republic of Germany h 2.243.028, cl. At 29 5/04, opu5lik. 1975 (prototype). If