FI103187B - A method for making an image of an electric heater mantle and an electric heater mantle and its blank - Google Patents

Description

103187

METHOD FOR THE PREPARATION OF A PICTURE OF THE ELECTRIC HEATER AND OF THE ELECTRIC HEATER AND ITS SUBJECT

A method for making an image jacket for an electric stove, wherein the method comprises making a 30 to 60 cm high sheath from a 0.5 to 1.0 mm thick steel sheet by forming a sheet blank into which the image is printed, then cutting and bending the blank. The invention also relates to a diaper made according to the method and a blank thereof.

10

Finnish patent 100942, utility model 1235 and patent application 853841 disclose certain types of electric heaters. Generally speaking, the heater has an outer jacket which forms a separate component during the assembly step. The shell-15 pa consists of a sheet of steel which, after various machining and bending operations, forms an outer shell on at least three sides. Due to the large size of the diaper, its material strength cannot be reduced to withstand even a moderate load. Thus, the thickness of the sheathing plate must generally be 0.6-0.7 mm.

20

Usually, the diaper is burnt painted, which gives it a good durability for sauna conditions. The jacket must withstand splash water and heat up to 150 ° C. In addition to decorative painted diapers, the market is clearly in demand. 25 picture heaters. Due to the special conditions of the sauna and the large size of the jacket, there is no known suitable imaging process for this purpose. The nearest technique may be found in printing various tin cans. The weight sizes, as well as the operating conditions of the cans, are significantly different from those for a sauna heater.

t m ~ «•

As such, metal offset printing is known. The printing press includes an oven or UV treatment step through which the printed blanks are conveyed to dry the ink. The capacity of the Pai-35 can be very high. However, the blanks are generally quite small. The printing of large metal surfaces is typically done by the screen printing process. However, this creates a color layer so thick on the surface of the 2 103187 metal plate that it cannot withstand bending or other machining, so that screen printing cannot be used to print the mantle of the stove. In general, all printing methods other than offset printing create an overly thick color-5 layer if the printed workpiece has to be machined. In order to increase the rigidity of the blank, one or more scalpels are made therein; and is bent into shape by a rounding machine. Until now a lot of edging has been used to make the mantle of the heater for sharp creases.

10

Offset printing is preferably done on a tin-plated steel sheet with a surface color that is more suitable for printing than raw sheet metal. Unfortunately, tinplate is not generally available - available in a sufficiently thick commercial grade for the sheath 15 of the electric stove. Most jars and cans are made of tin-plated steel with a thickness of 0.15 to 0.3 mm. The offset printed four-color raster image is so thin and permanent that the printed blank is quite resistant to machining.

20 U.S. Patent Nos. 5,339,731 disclose a printing press capable of printing cans. The dimensions of the plate blank are generally; smaller than 25 cm x 25 cm. The thickness is in the order of 0.25 mm.

The known metal printing presses are not as such suitable for printing thick, 0.6 mm thick sheet steel, although some of them are capable of passing such sheets through the printing process. In this case, the quality of the printing is not sufficient.

ί. . It is an object of the present invention to provide a method for making a picture of an electric stove and a picture; and its blank. Characteristic features of the method according to the invention are set forth in the appended claim 1, features of an electric heater casing are set forth in claim 6 and features of a sheet blank thereof are set out in claim 8.

3, 103187

Other embodiments and advantages of the invention will become apparent below in connection with an exemplary embodiment, which will be described below with reference to the accompanying drawings.

, 5 Figure 1 is an exploded view of an electric heater assembly

Figure 2 shows the blank of the jacket before offset printing Figure 3 shows the printed and almost finished workpiece

Figure 4 is a schematic representation of a cross-section of a sheet with a weight of 10 and layers of color

Figure 5 is a cross-sectional view of the structure of a roll formed edge

The basic construction of the heater according to the invention is conventional. The inner-15 jacket forms a stone space and 1-3 electrical resistors are installed there. In addition, the stone space is surrounded by an outer jacket and has a collar made of stainless steel or cast iron for appearance reasons. Referring to Figure 2, the bottom of the heater has a base portion comprising a tubular stainless steel housing 20 and ends. The first end forms an electrical module and is fitted with the thermostat device coupling parts with sensors, a clock device and a terminal block. Naturally, the stove may differ in its basic structure as long as it has a sheet metal jacket.

2 5

The electric stove shown in Fig. 2 is mainly assembled by plate bending and stamping. Only screws are used to fasten the end portions 12 (electrical module 8) and 12 'and the electrical resistors 3 and the inner sheath 1 is spot welded to the body 17. The structure is more precise. 30 described in the aforementioned Finnish patent. The other parts of the electric heater according to the invention, as shown in Figure 2, are the outer jacket 2, the tubular housing 10 and the so-called. butt plate 16. Here, a wall-mountable version is described in which said mounting base 19 is used, but the invention 35 is equally suitable for use with floor-standing designs using suitable support legs.

4 103187 The electrical resistors 3 are fastened from their flanges to the tubular housing 10 while it is still open at its seam. The connectors of the electrical resistors 3 extend from the holes 11 in the housing 10 to the inside of the housing, otherwise the electrical resistors 3 will rest securely on the housing 10.

5

The bottom of the stone space is limited by the so-called. a grate 16 which is mounted inside the inner sheath 1 and defines the stone space in the height direction. For this purpose, at the corners of the inner sheath 1, dents are locked at the attachment point which lock the grate 16 in place.

With respect to the present invention, it is essential that the diaper 2 is made by printing the image P prior to assembly and covers the entire area of the diaper. In order to increase stiffness, the sheath 2 includes a lower stiffener 2.1 at the bottom and a stiffener stitch 2.2 at the top. If 15 cast iron or similar collar members are used, the upper stiffener stud may be dispensed with if the collar member 18 is formed of cast iron.

The jacket 2 is made of cold-rolled, non-greased steel sheet, preferably 0.6-0.75 mm thick, but in each case 0.45-1.0 mm thick. A tinned steel sheet would be best for the printing process. As this is not available in general commercial quality, the production process is designed to use plain "black" steel plate. In the printing process, the width is first subjected to extra furnishing to ensure uniformity and grease-freeness of the surface characteristics of the board.

The basic weight of the material-side surface of the drive of Figure 2 a double purpose in accordance with the selected valkoemalimaalikerros 22. At least the printing press 30 fed at the edge of the blank '2! 30 unpainted strip 22 ', 3-20 mm wide. This is particularly important because the edge-to-edge painting would break in the printing press and the detached particles would cause image errors.

In a printing press, a four-color raster image is formed on the surface of the blank 2 'by an offset method. In a machine manufactured by Mailänder Druckmaschinenfabrik AG 5 103187 (DE), each color is printed separately, after which the blank is oven-dried to dry the color. The raster image is preferred here because the image is not a continuous layer but consists of discrete dots. It contributes to the processing of 5 blank blanks without breaking the image. The printed image as well as the back is protected by a double layer of gold varnish.

Image P printed on the stove production line is protected with plastic wrap. The blanks are then cut to the dimensions of the sheath, the rolls 10 are formed by roll molding cutouts 2.1 and 2.2, routing 2.3 to provide another blank 2 "(in Figure 3 without protective plastic). Printed image P covers the entire blank. Then blank 2" is ready for rotational molding to provide a diaper. Edge presses should be avoided because the image surface is 15 sensitive to damage if the sheet material is stretched.

The holes 2.3 are made with a specially designed eccentric tool that does not damage the printing surface.

Figure 4 is a cross-sectional view of a sheath plate. The steel sheet itself is identified by reference numeral 21 and the image layer by letter P. The other layers are enlarged to clarify the image. The white enamel layers 22 lighten the printing surface so that the printed image is bright. The image surface as well as the backside of the plate 25 is protected by a double gold plating layer 23 and 24.

Due to the large size of the diaper, it must be stiffened. The cast iron collar plate stiffens the top edge of the plate so that the top 30 sacks may not be needed. In each case, the reinforcing groove 2.1, which is shown in Figure 5, is to be formed at the bottom edge. From the outward curve, the radius of curvature R is kept large with the visible • part of the plate, preferably R> 3 x S (plate thickness).

Claims (10)

A method for producing an image mantle for an electric heater, comprising forming a mantle (2) 30 to 65 cm high from a sheet of steel 0.5 to 1.0 mm thick by forming a sheet blank into which an image is printed, then cutting and bending the blank , characterized in that printing is performed by a multicolor offset printing machine known per se, each color forming its own raster image, and prior to printing the image, the blank (2 ') is painted at least in the image area with a light white overcoat (22) at least at the edge fed to the printing press (30), an unpainted strip (22 '). Method according to claim 1, characterized in; that the base color is white paint. 2. The method enligt patent krav 1, the tongue grooves av att grundfärgen and vititaljfärg. 3. The method enligt patentkrav 1 eller 2, the ankle padn av av det det tryckta, the lady was shielded from the crane sidorna med et lackskikt (23, 24). Method according to claim 1 or 2, characterized; 20 in that the printed blank is protected on both sides by a lacquer layer 23, 24. 4. Method enligt face av patentkraven 1-3, kännetecknad av ΐ 15 att den tryckta förformen förstyvs med en eller flera yoga glade fern leaf hair (2.1, 2.2) wool framställs genome profiling, color skivmaterialet i närheten av det bölet stället bevaras! ' tiredligt oförlängt. ! 5. The method of applying a patent patent craven 1-4, a method of applying a tricyclic shield, in the form of a plastic shield, in the form of a plastic shield (2 "), in the form of an arbetsstadier, in the form of a hopper; * r och tas bert about frän den färdiga bastuugnen efter hopsätt- 25 ningen .i: 6. Folks (2) av en elbastuugn, whisper fools innefattar en en- i: hetlig, 0.5 - 1.0 cm tjock och 30 - 65 cm hög stälplät (21)., Ätminstone nap tre dess sidor, och fästredskap för fästningen · '30 av höljet (2) till bastuugnens ram (17), och i whisk hölje det finns en färgbild, kännetecknad av att färgbilden (P) ) en en offset-tryckt, flerfärgad rasterbild och av att det under denna, taking stälpläten finns et vitemaljskikt (22) a 103187 Method according to one of Claims 1 to 3, characterized in that the printed blank is stiffened by one or more clubs (2.1, 2.2) formed by roll forming, T, whereby in the vicinity of the bending point the sheet material 2 is substantially unstretchable. The process according to any one of claims 1 to 4, wherein: - 30 t_u. that after printing and possible protective varnishes? The printing surface is protected by a plastic film that follows the preform (2 ”) at all stages of operation and in the assembly of the electric heater and is only removed from the finished heater after assembly. 6. Sheath (2) for an electric stove comprising a uniform steel plate 103187 (21) having a thickness of 0.5 to 1.0 mm and a height of 30 to 65 cm on at least three sides and fastening means for attaching the sheath (2) to the body (17). , and having a color image on the jacket, characterized in that the color image (P) is an offset printed multicolour raster image and a val-5 coalescent paint layer (22) underneath the steel plate. 6 103187 7. Cushion (2) av en elbastuugn enligt patentkrav 6, turnbuckle av att det finns et lackskikt (23, 24) at the head of the cavity (2). Electric sheath (2) according to claim 6, characterized in that at least one side of the sheath (2) has a lacquer layer (23, 24) on the surface. 10 8. Skivförform (2 ') account ladies (2) av en elbastuugn, account whisker skivförform det är meningen att trycka med en flerfär-gad offset-tryckmaskin, och wilking böjas efter trycknin-gen, skärningen och de andra bearbetningarna account ett färdig hölje för en elbastuugn, och vilken förform utgörs av en 10 stälplät stalk tjockhet hem 0,5 - 1,0 mm och stem min dimension 32 - 67 cm, tiltnings av att skivförformen (2 ') innefattar en atminstone head bildarealen enhetlig grundfärgs- memory (22) och et ofärgat omräde (22 ') atminstone i den ända som rotten account tryckmaskinen (30). 15 A sheet (2 ') of an electric heater casing (2) for printing by a multicolor offset printing press, which after printing, cutting and other processing is intended to be folded into a finished electric heater casing, and which blank 15 consists of a sheet of steel having a thickness of 0.5 - 1.0 mm and the smallest dimension is 32 to 67 cm, characterized in that the sheet blank (2 ') comprises at least an area of the base paint (22) and an unpainted strip (22') at least on the edge fed to the printing press (30). 20 9. Skivförform (2 ') enligt patent krav 8, a turnbuckle av att grundfärgsmalningen (22) sträcker sig on the sidor account 3 -20 mm avständ frän sidan. Sheet metal blank (2 ') according to claim 8, characterized in that the base paint (22) extends at all edges from 3 to 20 mm from the edge. Sheet metal blank (2 ') according to claim 8 or 9, characterized in that the base color is a white paint. • 30 1. Method för tillverkning av et med bild förlöpel för account en elbastuugn, i wearing methods 30 - 65 cm högl (2) framställs av en 0,5 - 1,0 cm tjock stälplät genom att göra en skivförform av inskrivet mät, account whistle picture trycks, efter whistle for förformen skärs och böjs account that dude, kännetecknad av 35 att tryckningen utförs med en i sig själv stall flerfärgad offset-tryckmaskin, dære färg bildar sin egen rasterbild, 103187 2 ') eller ätminstone dess bildareal med ljus, heltckande grundfärg (22) för att ästadkomma en jämnt ljus Grund för bildtryckningen, save that ofärgat omräde (22') warm ätminstone i den ända som mud in 5 i tryckmaskinen (30). 10. Skivförform (2 ') enligt patent krav 8 ellet 9, tongue grooves av att grundfärgen är en vitemaljfärg. > «