SU1574554A1 - Method of manufacturing multilayer glass - Google Patents

Abstract

The invention relates to the glass industry and can be used in the production of flat and curved laminated safety glass for transportation and construction purposes. In order to increase productivity, reduce energy consumption and improve quality, heating in the method of making laminated glass, including the assembly of glass sheets with intermediate layers made of PVB film, heating a moving bag across the entire width of the source, the radiated heat of which heats the intermediate layer of the bonding film Rolling the package with rollers and final gluing is carried out from two sides in a narrow section directly in front of the cold rollers. Preferably, a heat source is used with a radiation maximum in the range of 0.4-0.7 µm. The heating time of the assembly is 1.5 minutes at a travel speed of 0.02– 0.12 m / s. After heating, the assembly is pressed with a force of 0.5 - 2.5 kg / cm ² . 1 hp f-ly, 1 ill.

Description

The invention relates to the glass industry and can be used in the production of flat and curved laminated safety glass for transportation and construction purposes.

The aim of the invention is to increase productivity, reduce energy consumption and improve quality.

The heating of the workpiece during its movement before pressing is carried out not over the entire area, but only in the area of 20–100 mm across the entire width of the workpiece, during the passage of which the surface of the adhesive film is heated to the softening temperature.

Heating is performed by a radiant flux exceeding the heat flux due to heat conduction through the glass at the bottom. Next, the heated part of the workpiece is subjected to pressing one of the known methods.

The width of the strip is determined by the formula

H b- | (cm),

where EO is the energy required for heating 1 cmg surface

these films from room temperature to 20 ° C, D1tts

V is the speed of movement, cm / s;

procurement - light flux density

energy, W;

v is the absorption coefficient of the light energy by the PVB film.

With a constant heat flux with increasing speed of the workpiece, the width of the strip increases. At a constant speed of movement of the workpiece with an increase in the size of the light sweep, the width of the strip decreases, which creates better conditions for removing air from the interglass space,

The upper limit of the zone width is determined by the density of the flux of light energy, as well as by the conditions of air evacuation. In addition, when the zone width increases by more than 100 mm, it becomes necessary to create high pressures on the glass, which can lead to destruction of the workpiece.

Intensive heating of the workpiece can be carried out by sources of radiant energy, the maximum radiation of which is in the visible region of the spectrum (0.4-0.7 µm). Since the glass absorbs this energy much less than the film, the latter reaches the gluing temperature faster than the glass, which greatly facilitates the gluing process.

The drawing shows the implementation of the method.

The preform of the multilayer package 1 with a size of 950-650 ° 12 mm (two glasses with a thickness of 6 mm and 3 layers of adhesive PVB film) is placed on the roller table 2 and moved at a speed of 0.02-0.12 m / s. Above the roller table there are lamps 3 at a distance of 100–200 mm from the surface of the package, the radiation of which is focused on the strip of the workpiece with a width of 30 mm. Thus, a part of the workpiece with a width of 600 mm is exposed to a thermal effect of 0.5 ° C. of the common film it has time to warm up to the temperature of the oozm gcheni equal to 120, after which a force acting on the workpiece through the rolls is equal to 0.5-2.5 kg / cm

This sequence of processing of laminated glass blanks allows to increase the productivity of the process and improve product quality.

The productivity of the process is enhanced by the use of heating.

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the surface of the adhesive film of a powerful flux of radiant energy, as well as by increasing the speed of removal of air from the interglacial space due to the fact that each section of the bag is subjected to pressing immediately after the heating operation.

Increasing the density of the radiant flux allows to increase the speed of passage of the workpiece through the pressing device.

The absence of a cold-pressing operation and the repeated passage of a package of rolls reduces energy consumption.

Compared to heating the entire preform in the proposed method, it is possible to increase the productivity by more than an order of magnitude. For example, when the DXt-10000 arc lamp is used as a source, the heating time of the workpiece is reduced from 30 to 1.5 min compared with the option of heating by incandescent lamps, which corresponds to an increase in productivity by a factor of 20.

Along with an increase in the productivity of the process, the quality of the product also increases, since during the gradient heating the surface of the adhesive film is heated above 120 ° C5, which creates better conditions for bonding the film to the glass.

Claims (1)

Invention Formula 1 "A method of making laminated glass by assembling packages of sheet glass with intermediate layers of polyvinyl butyral film, heating a moving package across its width with a source, the radiated heat of which passes through the glass, heats the intermediate layer of the film to be glued, rolling the package with rolls and subsequent final gluing package, characterized in that, in order to increase productivity, reduce energy consumption and improve quality, the package is heated from two sides in a narrow section directly before cold rolls. 2, The method according to n.ls, characterized in that the heating is carried out by a source with a radiation maximum in the range of 0.4-0.7 µm. /