SU1391898A1 - Method of producing mineral-wool panels with synthetic binder - Google Patents

Abstract

The invention relates to the production of heat insulating building materials, namely, in the manufacture of mineral wool plates on a synthetic binder by hot pressing. In order to increase productivity while maintaining the quality of the plates, the mineral wool carpet impregnated with a binder is cut into blanks, the blanks are compacted to a predetermined thickness, heated between the heating plates of the press and fed into the blanks of heated air to a temperature of 60-100 ° C above the curing temperature C, through the openings of the jet with a diameter of 1-3 mm in the heating plates. After reaching the curing temperature in the central zone of the preform, the air supply is stopped, the press plates are disconnected, the cured blanks are removed from the press and they are cut into plates of a given size. The described method reduces the duration of heat treatment in 1.5-2 times. 1 il. 1 tab. cl

Description

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. The invention relates to the production of heat insulating building materials | s and can be used in the manufacture of mineral wool boards by hot pressing.

The aim of the invention is to increase productivity while maintaining the quality of the plates.

The drawing shows a diagram of a device for carrying out the method of manufacturing mineral wool plates on a synthetic binder.

The device contains a pump 1 with a set of cutting plates 2, between which there are gaps for mineral wool 3. Heating plates 2 are provided with channels 4 for distributing air to the section 5, through which the air enters workpiece 3. Channels 4 They are combined with collectors 6, which are connected via valve 7 with hot air line 8, including a heat exchanger (air preheating-gel) 9 and a blower 10.

Examples of the method. : In the manufacture of increased stiffness plates by the method of hot pressing, a mineral wool carpet impregnated with a synthetic binder (neutralized phenol-alcohols of mark “B in the amount of 5.2-5.6% by weight) is cut into blanks of size 3600-1800 mm.

The resulting blanks are placed between the heating plates of a 10-story press D 4743B.

After loading the blanks, the heating plates of the press are closed, having compacted the blanks to a thickness of 40-60 mm. From this moment the contact heating of the blanks begins.

The heating plates of the press are heated with steam with a pressure of 16 MPa, and their temperature is 195 ° C. Air from the compressor line (flow rate per heating plate 3.5-6.88) is passed through the pipes of a recuperative heat exchanger of the serpentine type, in which the air is heated to 240-280 ° C due to the heat of the combustion products of natural gas. Through the collectors, the channels in the heating plates of the press and the holes with a diameter of 1-3 mm are 0

dimensionally (with a pitch of 100 mm), distributed over the surface of the plates, immediately after the press plates are closed, the air heated in the heat exchanger is fed into the blanks, whose pressure at the entrance to the press is 0.1-0.3 atm. Thermograms of temperature change on average (over thickness) of the blanks are recorded and the duration of heating from the moment the press plates close and the air supply turned on until the center of the blanks is 180 ° C is determined, at which the curing of phenol alcohols mark B. is already performed.

After reaching the curing temperature in the central zone of the workpieces

5, the air is stopped with a crane, the press plates are opened, the cured mineral wool blanks are removed from the press and they are cut into plates of a given size.

Specific technological values

The 0 parameters for the manufacture of mineral wool boards according to the proposed and known methods are given in the table.

The proposed method allows to reduce the duration of thermal

 processing 1.5-2.0 times, and especially it is effective in the heat treatment of mineral wool boards of increased thickness. Its use allows to significantly increase the productivity of technological lines equipped with storeys

Q presses hot pressing.

Claims (1)

Invention Formula A method of making mineral wool plates on a synthetic binder, including cutting the mineral wool carpet impregnated with a binder into blanks, compacting the blanks to a predetermined thickness and contacting them between the press heating plates, cutting the cured blanks into plates, characterized in that, in order to increase productivity maintaining the quality of the plates, through the holes in the heating plates, air is heated to a temperature higher than the curing temperature of the binder by 60 ... with 100 ° C jet diameter i-3 mm. 0 The thickness of the mineral wool plates, mm AO The amount of heated air per plate, 60 40 40 60 40 40 40 3.5 6.8 3.5 3.5 3.5 3.5 3.5 260 260 260 240 280 240 280 80 80 80 60,100 60 100 Supply air temperature, s Exceeding the temperature of the heat carrier (heated air) over the polycondensation temperature of the binder, with The diameter of the jet supplied air at the entrance to the mineral wool carpet, mm Duration of heat treatment, min Plate density, kg / m Compressive strength at 10% deformation, MPa 0.065 0.0670.0680.07 0.065 0-, 0720.067 0.069 0.071 Flexural strength, MPa 0,41 0,43 0,45 0,48 0,46 0,50 0,45 0,46 0,47 Binder content,% The degree of polycondensation of the binder,% 89 90 95 97 95 96 96 95 97 - - - - -. ,, ..  : UXXXXXXX5 5 UCHLDA7S GU 5.4 5.6 5.3 5.2 5.5 5.4 5.3 5.2 5.4 5 2VNIIIPIZakaz 1793/20 Circulation 528 Subscription Production and printing company, Uzhgorod, y, i. Project, 4 Table continuation. 260 260 260 240 280 240 280 80 80 60,100 60 100 (7 YU eight