FI56960B - SAETT ATT SKYDDA EN KANT PAO EN PANEL - Google Patents

Description

•waste"·! ΓβΙ ADVERTISEMENT γλλλλ flj ^ * * UTLÄGGNINGSSKAIFT 56960 C (45) Patent eySnn-Jlly 12 05 1930 ^ ^ (51) Kv.lk. '/ Int.CI. * C 03 C 17/32 FINLAND — FINLAND (21) Pat. nttlhik.mut— P * t * ntan * öknlnj lU62 / 73 (22) HakemlipIlYl - AiwOkninfidag 08.05 * 73 '' (23) AlkuptlvS - Giltifhetsdaf 08.05.73 (41) Tullut | ulkisek * i - Bllvlt offmtllg l8.ll.73

Patent and Registry Administrators .... ........, _. ,,, (44) Date of Nihtivikslpanon and kuLlulkalsun. -

Patent- oeh registerstyrelsen Ansökin Utlafd och utl.ikr1ft.n publkerad 31 · 01.80 (32) (33) (31) Pyydetty etuolkeu * - Begird priority 17.05.72

Luxembourg (LU) 65382 (71) Glaverbel-Mecaniver, Chaussee de la Hulpe 166, B-1170 Brussels, Belgium-Belgium (BE) (72) Henri Pichel, Jemappes, Belgium-Belgium (BE) (7U) Antti Impola (5U) ) Method to protect the edge of the panel - Set the panel to cover the panel

The invention relates to a method of protecting an edge of a panel, the panel comprising at least two sheets of vitreous material joined together in the region of the peripheral edge of the panel, said plates spaced apart in the entire panel or in the entire region except in said edge region, the panel being provided with a trough-shaped cover which covers the continuous edge zones of the panel edge and opposite surfaces of the panel.

As used herein, the term "glassy material" means both glass and glass-crystalline material, i.e., a material formed of glass by subjecting it to a heat treatment that results in the presence of one or more crystalline phases in the material.

The edges of sheets of glassy material are known to break quite easily. The edges of the discs may be damaged during handling and transport of the discs if these edges strike hard objects. During transport, vitreous sheets are usually supported at their edges, which sometimes cause the edges to crack or otherwise be damaged.

It has been proposed to protect the edges of sheets of vitreous material by fitting protective gutter-like cross-sections, usually made of wood or metal, on top of these edges.

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However, experience shows that even when such guards are used, a considerable amount of breakage occurs due to the stresses propagating from the edges of the plate. This is apparently due in most cases to defects in the edges of the boards, such as scratches or notches, even before the guards are fitted. Such defects can easily arise, for example, when cutting boards from Continuous strips or larger blanks, And these defects can act as sources of tension. It is said that the guards do not reduce the susceptibility of the plates to breakage even under the influence of even small Impact forces, when these forces are applied to the guards at the already damaged parts of the plates. In addition, these guards can easily accidentally move out of place or protrude from the discs when handling them, unless the guards adhere very firmly to the edges of the discs. Applying high compressive forces to opposite side walls of the guards can also lead to detrimental consequences. Unless the opposite surfaces of the vitreous plates are completely flat And parallel over the entire extent of the edging zones, the compression applied by the guards tends to concentrate at certain points, in which case this compression is not evenly distributed. In the event that highly concentrated compression occurs at the stress-causing point, the plate may rupture. The local compression itself can damage the surfaces of the glassy plates, especially if metal shields are used.

Ee \ ma suo Just en fitting is also not a suitable means of protection for curved glass-like plates, which are, for example, glass panes which form the windscreens of certain vehicles or are part of such windscreens.

The need for edge protection is particularly present in products which, in combination, comprise two or more glass sheets connected to each other by their surfaces. Examples of such products are laminated glass panels And panels in which two or more glass-like plates are spaced apart. The prefabricated guards described above can be fitted to the edges of such units to protect the edges of the vitreous plates, but the above-mentioned disadvantages associated with the use of such guards are even more serious because the surfaces on which the guards press are often not completely parallel to each other.

It is possible to leave the prefabricated covers in place when the glass-like panels are mounted on frames, eg a window frame, but

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ο In this case, they often cause difficulties, of which e.g. mention should be made of the accumulation of water in the water traps formed by these shelters. This is especially detrimental in double glazing units, as water can penetrate the joints between the panels and get into the interiors of the units.

The object of the invention is to provide a method of edge protection which can be applied to both flat and curved plates and which makes it possible to protect glass-like plates at least to some extent from the debilitating effect of stress-causing deficiencies in the edge zones of the plates.

The method according to the invention is characterized in that said cover is formed of a nin-situ plastic coating material which is applied in a molten state by spraying and which hardens or can be cured to form a solid body which shrinks before curing ends, such coating material being adapted to cover such a panel. continuous edge zones of the opposite surfaces of the edge and the panel and then allowed or cured "in situ" to form said cover in the form of a trough, the opposite walls of which are resiliently pressed against said edge zones of the outer surfaces of said plates.

This method of protection has a number of important advantages over the use of prefabricated covers. Because the cover is formed "in situ" by applying a coating material in a flowable state, when cured, the cover material is in intimate contact with the coated edge or edges of one or more vitreous sheets, as well as the edge zones and edges the compressions applied to the opposite surfaces of the panel in the area of these protected edges will always be distributed substantially evenly along these edges. The applied fluid in the flowable state can penetrate the notches and cracks at or near the edges of one or more vitreous plates, and thus the cover can reduce the risk of breakage caused by stresses propagating from such deficient points.

The method according to the invention can be applied regardless of the longitudinal profile of the edge of the panel to be protected, regardless of the cross-sectional profile of this edge and regardless of whether the panel is flat or wrapped.

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va. Furthermore, the invention makes it possible to effectively protect the edges of panels in which the panels include panels of patterned glass, whereas instead such edges cannot be protected by means of the prefabricated covers described above.

Another rather important advantage of the protection method according to the invention is that it makes it possible to protect the edges of the panel very effectively in the corner zone where such edges meet. When using prefabricated covers, the cover can be fitted to each edge of the rectangular panel, but the protection thus obtained does not extend at least sufficiently effectively to the corners of the panel. In the practice of the invention, the material in the flowable state can be applied continuously to cover the interconnected edges and the corners formed by them so that the material hardens and forms an integral cover which covers both the edges and the corners. The plastics in the flowable state can be applied in such a way that they form a continuous cover enclosing the entire circumferential edge of the rectangular or other shaped panel. If desired, the cover can be removed from the panel when this is installed in the frame or otherwise put into use.

The method according to the invention can be applied to protect the edges of a panel formed of two or more surfaces assembled in contact (at least one of which is a glass-like plate), and further also to protect the edges of a hollow panel having two or more spaced plates. at least one of which is a glassy plate.

When applying the method according to the invention to protect the edges of panels consisting of two or more panels joined so that their surfaces contact each other, as mentioned above, the shrinkage caused by the curing of the cover can be used to hold the panels together, but the method according to the invention can also be applied. , that the sheets are held together in some other way, e.g. in the case where the sheets are bonded together into a laminate.

As the coating material in the flowable state, a plastic or a plastic-containing material is suitably used.

The coating material applied to the panel suitably contains plastic in the molten state. Molten plastics are relatively easy to handle and apply, so that they form the intended use.

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a thick layer suitable for support. In addition, considerable high shrinkage forces can float as the plastic cools from the molten state to room temperature. The composition of the applied mixture and the temperature at which the coating is carried out are suitably such that the applied coating solidifies as quickly as possible. The temperature of the edge zones of the panel to which the coating material is applied is suitably considerably lower than the temperature of the molten plastic. In this case, the coating material can be cooled easily and quickly to form the desired shield and to develop elastic forces in this shield.

According to a preferred embodiment of the method according to the invention, the coating material is a molten plastic material which can be applied by spraying, as already mentioned above. Thanks to this method of application, the coating material can be applied quickly, while at the same time the distribution of the material on the edge of the panel can be precisely controlled so as to form a cover with any desired cross-sectional thickness and profile. In addition, the spraying method can be easily used in connection with automatic or semi-automatic production lines by moving successive panels past one or more spraying points or by moving one or more spraying heads along a panel line.

Of particular importance are those processes according to the invention in which the coating material applied to the panel is a plastic material which is flame sprayed onto the panel. This technique is very efficiently and economically applicable to the implementation of the method according to the invention, and promotes the formation of a cover whose plastic material penetrates the notches or other surface imperfections in the coated surface parts. When using the flame spray mist technique, the plastic coating material is continuously fed through the nozzle of the flame sprayer so that the plastic is heated and atomized in the flame and blown from the spray gun in the form of a spray. The plastic can be fed to the atomizer from a press, whereby the plastic can e.g. enter the atomizer in a molten or solid state, e.g. as a solid rod or wire that continuously melts in a flame. The circulating sprayer does not need cleaning as often as the sprayer used to spray plastic material solutions.

The use of a flame sprayer is furthermore advantageous because the thickness of the plastic coating can be adjusted and, if necessary, it can be varied from one zone of the panel to another. As an example,

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the thickness of the cover formed along a given rim may increase from the end regions towards the central region along such Remus.

In some embodiments of the invention, the coating material may be polyvinyl chloride, any polyester, polyester acetate, nylon, or dust tetrafluoroethylene. These materials have quite advantageous combinations of their properties when judged on the basis of their intended use.

In other embodiments of the invention, the coating material is a copolymer of ethylene and vinyl acetate and / or a copolymer of ethylene and acrylic acid. These plastics have been found to be particularly suitable for forming effective edge protectors.

In general, it is preferred to use a coating composition which, on curing, changes chemically and / or in phase, e.g. by crystallization. An important example is the use of a coating composition containing "in situ" polymerizable monomers. In general, such changes result in improved contact between the cover and the edge of the coated panel.

The coating composition may contain various additives, e.g., color pigments, fillers such as wood, glass fibers, cement, or metal powder, or components that accelerate or promote solidification or curing, e.g., crosslinking components to crosslink polymer chains.

A substance is suitably fitted between the edges of the panel and the applied mixture, which promotes the adhesion of the coating to the edge of the panel. Such a substance may be, for example, a mixture having groups which are capable of reacting both with one or more materials of the coated surfaces and with one or more main components of the coating. Silane compounds are suitably used for this purpose in the case where the coated surfaces are glass surfaces. The improved adhesion of the cover is advantageous both because the cover stays better in place and also because a better seal is created between the penetration of fluids, e.g. steam or water, between the cover and the coated edge of the panel.

The method according to the invention can be applied to the protection of the edges of hollow panels, as already mentioned above. Thus, the invention can be applied to the protection of the edges of panels having two panels joined together in the region of the circumferential edges of the panel, and these panels are spaced apart throughout or throughout the panel except this border zone. When the method according to the invention is applied in this way, the coating material is suitably applied so that the trough-like cover formed when this applied material hardens covers the entire circumference of the panel and the opposing walls of the trough resiliently press into the outer surface edges. When applied in this way, the method according to the invention provides the most effective protection for the edge of the panel. Quite satisfactory protection can also be provided by "in situ" forming two or more covers according to the invention, so that these covers together cover the entire circumference of the panel or most of this circumference.

One or more shields formed in this manner in the hollow panel may be used to hold the sheets in one or more spacers therebetween, but additional means of attachment may also be used, e.g., glue to secure the sheets to such spacers. The forces exerted by the guard or guards on opposing plates as these guards shrink are sometimes greater in the case where the boards are pressed together by some external means as one or more guards harden. Once curing has taken place, this additional compression is removed. In addition, one or more covers may keep the plates at a desired distance from each other. In this case, the material in the flowable state from which one or more covers are formed can be applied so as to be between the opposing surfaces of the panels in the edge zones of these panels, as well as on the edge zones of the outer surfaces of the panel. In any case, this flowable plastic is suitably applied so as to cover the inner surfaces of the sheets in their peripheral zones, so that the cover, once hardened, reduces the risk of breakage due to stress-generating defects in these inner surface zones.

In the manufacture of a hollow panel having two or more plates spaced apart by one or more spacers, the plates may be glued to these spacers, but if desired, the plates may also be held in the spacers by the compressive forces exerted on the outer edge surfaces of the panel.

By forming the cover according to the invention "in situ" so as to surround the entire edge of the hollow panel, the interior 8 S6960 of the panel can be sealed by means of a cover, or the cover can be used as an aid to such sealing.

However, the foregoing does not mean that when applying the invention to protect the edge of one or more glass-like panels included in a hollow panel, the invention would inevitably require the formation of a cover covering the edges of both panels or at least two panels if the number of these panels is more than two. .

On the contrary, Each glass-like panel of the panel can be equipped with its own edge protection or its own covers. In this case, the protected plate or Each protected plate itself forms a panel for the purpose of this word, where it is used in the above definition of the invention and in the appended claims.

A panel having one or more edge guards has the advantage that the compressions applied to the opposing surfaces of the panel are always distributed substantially evenly along this edge. The material of one or more shields is in close contact with those surface portions of the plate which are located inside one or more shields, even if these surface portions have defects such as notches or split points. The shield or shields thus reduce the risk of the stresses causing the plate breaking breaking from propagating from such stress-generating points, as already mentioned above. When a transparent cover is used, the presence of the Elastic Forces acting on the cover can be detected by means of light-elastic measurements. If the cover can be removed from the panel, the presence of such latent Elastic Forces is seen from the fact that the sides of the removed gutter approach each other as the loose gutter enters a state of equilibrium.

The panel suitably has at least one such cover, which covers the interconnected edges of the panel, and the angle at which these edges meet. In this case, the corners are protected more effectively than by fitting prefabricated guards to the interconnected edges of the panel so that these guards are completely interlocked.

In the most preferred embodiments, the panel has a single cover that surrounds the entire circumferential edge of this panel. The protection thus obtained is the best possible. The panel is very well suited for mounting in a frame or other way so that the cover is left in place.

Some panels of the invention have panels connected 9,56960 either directly or to one or more spacers with such a single cover surrounding the entire circumferential edge of the panel. Such a panel can be manufactured quite quickly and at low cost.

Also within the scope of the invention are panels with one or more edge guards a, one or more of which are wholly or mainly formed of polyvinyl chloride, a polyester, polyvinyl acetate, nylon or polytetrafluoroethylene.

Also within the scope of the invention are panels whose covers are formed entirely or mainly of a copolymer of ethylene and vinyl acetate and / or a copolymer of ethylene and acrylic acid.

In the case of a panel according to the invention as defined above, having two plates connected to each other in the region of the circumferential edge of the panel and these plates spaced apart in the whole region or in this region except the edge zone, a cover is formed, suitably covering the entire circumference of the panel, and that the opposing walls of the trough-like cover resiliently press into the edge zones of the outer surfaces of said plates.

Reference has already been made to the flame spraying of plastics. Applying plastic by flame spraying offers a number of important advantages. The method can be applied quite quickly and easily. Compared to processes in which plastic is applied as a solution, the cost of the solvent is saved, as well as the time required to prepare the solution and evaporate the solvent from the plastic after it has been applied to the substrate. Equipment used for flame spraying does not need to be cleaned nearly as often as equipment used to melt or otherwise apply mixtures of plastics dissolved or dispersed in a liquid medium.

In preferred embodiments, the flame sprays are a copolymer of ethylene and vinyl acetate and / or a copolymer of ethylene and acrylic acid as the open plastic material. Such polymers, in combination, have properties that make these polymers quite well suited for forming coatings on different types of substrates and different substrate materials. It is surprising that such plastics can be flame sprayed. The flame temperatures of the flame spray gun are quite high and can be 1500 ° C and even higher - ίο S 6960 met. It could be assumed that plastics would burn or be damaged in a flame, but this is not the case. It is particularly appropriate to use a plastic material sold by the trade name Elastic Union in Brussels under the trade name "hotmelt". This material contains a copolymer of ethylene and vinyl acetate or a copolymer of ethylene and acrylic acid, as well as paraffin wax and phenolic resin.

The spray flame is suitably provided by continuously feeding the plastic from the orifice into the stream of combustible gas and oxygen in the nozzle of the flame sprayer, and at the same time forcing the air flow to pass through the nozzle to give the desired flow rate to the sprayed plastic. One suitable nebulizer is the flame spray gun sold under the trade name “Mogul” by Metallising Company of Europa GmbH in Solingen, Germany, under the trade name “Mogul.” Oxygen and combustion gas, eg natural gas or propane, or a mixture of combustible gases are fed into the flame injector nozzle 0.2 ... 2 , Under a pressure of 5 kg / cm, and an air supply pressure of 2 ... 7 kp / cm.

According to some methods, the flame-sprayed plastic is fed molten into the nozzle of the flame sprayer. Feeding the plastic as a melt facilitates the required fogging of the plastic in the flame.

The plastic is suitably fed to the nozzle from a plastic melting and injection molding device. The use of such melting and spraying devices in connection with a flame spray gun is particularly valuable, since the coating treatment can be carried out quickly in connection with pulp production or pulp treatment. The temperature of the plastic fed through the nozzle of the flame sprayer is suitably 150 to 200 ° C and its pressure is 2 to 7 kp / cm 2. These conditions have been found to give very good results when using commercially available equipment. One suitable melting and pressing machine is a machine sold under the tradename Nordson Corp., Ohio, USA under the name "Nordson V".

This method can be used to coat a wide variety of substrates and substrate materials. By way of example, the method can be used for coating metal wires and pipes and other metal products, as well as for coating sheets or panels of wood or other material.

Some exemplary embodiments of the invention will now be described with reference to the accompanying schematic drawings.

Figure 1 shows in cross-section a manufacturing step of a double glazing unit in which the process according to the invention is applied.

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Figures 2 to 4 show in cross-sections some parts of three other panels according to the invention.

Figure 5 is a side view and partly in section of an apparatus according to the invention for flame-spraying a plastic coating material onto a substrate.

Figure 1 illustrates a process for manufacturing a hollow panel 1, wherein the panel has two glass sheets 2, 3i, each measuring 50 x 40 x 0.4 cm. A continuous neoprene strip 4, with cross-sectional dimensions of 1.5x1 cm, is fitted between the edges of these two glass sheets along the entire circumference of the sheets.

The drawing shows one of the steps of forming the edge guard 5. This edge guard will be gutter-ready, and it will surround the entire circumferential edge of the panel. The cover is formed "in situ" by spraying partially polymerized polyvinyl acetate at 50 ° C onto the panel edge with a hot air spray gun 6. The temperature of the panel edges is about 20 ° C. As shown in the drawing, the cover-forming mixture is first sprayed on one side of the panel The panel is coated in this way along its entire circumference to form one half of the final gutter, after which the mixture is sprayed in the same way from the other side of the panel to replenish the gutter. The applied mixture is heated to completely polymerize the vinyl acetate as the gutter hardens, resulting in shrinkage. press resiliently on the outer surfaces of the glass sheets 2 and 3 so that these sheets are pressed into the intermediate strip 4 by the action of the elastic forces generated in the chute.

When the polymer blend is sprayed onto the panel, this blade penetrates any notches or scratches that may occur in the coated surface portions of the glass sheets. The finished protective gutter is in thorough contact with the panel at all points of this panel, And the forces applied by the gutter components to the panel are distributed substantially evenly over the entire circumference of the panel.

If desired, the polymerization of the protective mixture can be promoted by adding a catalyst to this mixture.

The buoy mixture can be sprayed onto the edges of the panel so that the thickness of the gutter is greater in the central areas of the four edges of this panel than in the end areas of these edges.

Prior to the application of the polymer mixture, forces may be applied to the exposed outer surfaces of the glass sheets 2 and 3 to compress the spacer 4 to some extent, whereby these forces may be applied as the polymer mixture is applied and this mixture hardens. In this case, the compressive force exerted by the protective trough on the plates 2 and 3 in the finished object is greater, because these compressive forces cause both the shrinkage of the trough as this trough is formed and the elastic forces acting on the intermediate strip 4 released when the glass plates 2 and 3 are exposed. the compressive forces applied during formation are removed.

According to a modification of the embodiment described above on the basis of Figure 1, the plastic mixture is applied so as to form a protective trough only along one edge of the panel.

According to another embodiment, the plastic mixture is applied so as to form a protective trough surrounding the circumferential edge of a single glass sheet so that the sides of the trough are resiliently pressed against the edge portions of opposite surfaces of this glass sheet.

Figure 2 shows a part of a hollow glazing unit. This unit is formed of two glass sheets 22, 23, the edge portions of which are bent towards each other and fastened to each other by an air layer 24 arranged between the edges of the sheets. A gutter-shaped protective gutter 27 is formed in situ is cured "in situ" so that the opposite plates 22 and 23 of the panel are subjected to the tightening forces caused by this gutter. The thickness of the glass fiber-reinforced silicone-based adhesive layer 24 is 4 mm before forming the protective gutter. During the shrinkage of the gutter, the thickness of this adhesive joint decreases to 2 mm due to the tightening forces. Due to the reaction forces exerted by the assembled glass sheets on the flanges 25 and 26 of the gutter, the bridge part 27 of this gutter is under tension.

The unit shown in Figure 3 has two conventional glass o-sheet plates 28, 29 · The edges of the plates are fixed to the spacer 30. Before joining these plates, the edges of the inner surfaces of the plates are metallized and provided with solder layers 31, 32. The plates are attached to the spacer 30 with solder columns 33 between the coated edges of the plates and this spacer. The polyester coating composition is applied to the peripheral edge of the panel to form an "in situ" protective trough 3, the opposite walls of which press resiliently against the edges of the panel due to the elastic forces generated as the trough hardens and shrinks. The cross-section of the gutter is 13 5υ960 such that it has thicker zones 33 »located between the central bridge part of the gutter and the opposite walls covering the edges of the outer surfaces of the glass sheets. Thanks to the cross-section shaped in this way, the gutter is able to apply considerably large forces to these opposite surface parts.

The panel shown in Fig. 4 has two plates 36 and 37 »the edge portions of which are tightened against an intervening rubber column 33 by the action of elastic forces acting on the protective trough 39. This protective chute is formed "in situ" of a mixture containing polyvinyl chloride applied by means of a hot air spray gun. The edges of the outer surfaces of the glass sheets 36 and 37 applied to the bine are coated with thin layers 40 and 41 of gamma-propyldimethyltriethoxysilane to make the applied plastic mixture better adhere to the glass sheets. The spacer 38 is compressed quite tightly by the shrinkage forces of the gutter, so that the hollow panel can be effectively sealed. In other embodiments of the invention (not described), the panels shown in Figure 4 are made as described above, except that in one case the cover is made of nylon and in another case of polytetrafluoroethylene instead of polyvinyl chloride.

In some other embodiments of the invention, which are also not described, the methods for forming covers described above have been applied to form covers for curved panels. These types of curved panels can be, for example, a wooden board, so that a decorative panel is obtained.

Figure 5 shows an apparatus for coating a substrate with a plastic material applying the flame spray technique according to the invention.

This apparatus has an injection head 42 to which plastic material can be continuously fed up to the line 43. The clamp is of the "Nordson V" type sold under the tradename Nordson Corp., Ohio, USA. Plastic material is fed from the end 42 all the way to the supply pipe 44 to a flame sprayer 43 attached to this pipe. This flame sprayer has body parts 46 and a central hub 47 to which the inner nozzle component 48 is clamped by a clamping ring 49 threaded to this hub. The conical shell 50 is threaded onto the outer annular flange 51 of the body portion 46, and the outer nozzle component 52 is threaded to the lower end of this shell.

A line 53 is connected to the body 46 of the burner head, and this line communicates with a duct 64 formed in this body, and

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which opens into a recess 55 »formed in the bottom surface of the central hub 47. This recess communicates with a passage 56 extending through the inner nozzle component 48 to the free end of this component. The line 57 is connected to the body 46 of the burner head, and this line is connected to the channel 58 formed in this body,

And which opens to its bottom surface between the central hub 47 and the circumferential flange 51 so that this channel communicates with the interior space 59 of the shell 50 ·

When a flame atomizer is used, a mixture of propane and oxygen is fed to this atomizer along line 53 so that this gas mixture continuously flows from the inner nozzle component 48 through the passage 56 herein. At the same time, air is supplied to the flame sprayer up to Line 57. This air flows through the inner space 59 of the shell And further through the annular space 60 between the inner nozzle component Js and into the further flowing propane-oxygen mixture. The gas mixture flowing from the nozzle burns to form a rather hot flame. The plastic material fed down to the tube 44 enters the flame directly through the central bore 61 of the inner nozzle component And distributes in the flame into very small droplets which are ejected from the flame atomizer as a fine very fast jet.

The flame sprayer described above is of the "Mogul" type, sold under the trade name Metallising Company of Europa GmbH, Solingen, Federal Republic of Germany.

The following operating conditions are very suitable: 2 plastic supply pressures to the spray head 3.5 kp / cm

the temperature of the plastic fed to the spray head is 175 ° C

p gas pressure in line 53 1 kp / cm air pressure in line 57 4 "

Figure 5 shows a flame sprayer positioned above a conveyor 62, which conveyor is used to transport flat workpieces 63 under the flame sprayer so that the flame-sprayed plastic forms a continuous flat coating 64 on this piece.

According to another embodiment of this coating method, a plastic coating material is flame-sprayed on the edges of the glass sheet to form a gutter cover which surrounds the edge surfaces of the sheet surface and the opposite surfaces of the sheet associated with these edge surfaces.

A very suitable plastic material suitable for flame spraying by the apparatus shown in Figure 5 can be formed by adding 15,55960 of ethylene and acrylic acid or ethylene and vinyl acetate to a molten copolymer of: (a) paraffin wax or microcrystalline wax or a rosin resin to increase the tack of the mixture, (c) a filler, e.g. clay, carbon black or quartz.

The following is an example of a plastic coating material which can be flame sprayed according to the invention.

parts by weight copolymer of ethylene and vinyl acetate (melting index 20) 30 copolymer of ethylene and vinyl acetate (melting index 3) 12 copolymer of ethylene and vinyl acetate (melting index 220) 6 microcrystalline waxes (melting point 82 °) antioxidant 1 aluminum (as filler) 15 ·

Claims (6)

16 S b 960 A method of protecting an edge of a panel, the panel comprising at least two sheets of vitreous material joined together in a region of the peripheral edge of the panel spaced apart throughout the panel or throughout the panel except said edge region, the panel being provided with a trough-shaped cover covering continuous edge zones of the edge of the panel and opposite surfaces of the panel, characterized in that said cover is formed of an "in situ" plastic coating material which is melted in a molten state by melting and which hardens or can be cured to form a solid body which shrinks before curing is adapted to cover the continuous edge zones of the edge of such a panel and the opposite surfaces of the panel and then allowed or made to cure "in situ" to form said cover in the shape of a trough opposite it; these are resiliently pressed against said edge zones of the outer surfaces of said plates. A method according to claim 1, characterized in that the temperature of the edge zones of the panel to which the coating material is applied is much lower than the temperature of the molten plastic. A method according to claim 1, characterized in that the coating material is flame sprayed on the panel. Method according to one of Claims 1 to 2, characterized in that the coating material applied to the panel is polyvinyl chloride, a polyester, polyvinyl acetate, nylon or polytetrafluoroethylene. Method according to one of Claims 1 to 3, characterized in that the coating material applied to the panel is a copolymer of ethylene and a vinyl acetate and / or a copolymer of ethylene and acrylic acid. Method according to one of the preceding claims, characterized in that a substance is applied between the edge of the panel and the applied coating material, which promotes the adhesion of this coating material to this edge.