Nov. 10, 1931. L. P. FORMAN _ MANUFACTURE OF SHEET GLASS Filed Feb. ’ 12. 1930 WW 1,830,788 ‘ 2 Sheets-Sheet l , INVENTOR > Nov. 10, 1931. ‘ ‘L. P. FORMAN' 1,830,788 MANUFACTURE OF SHEET GLASS Filed Feb. 12, 1930 2 Sheets-Sheet 2 1,836,788 Patented Nov. 10, 1931 UNITED’ STATES PATENT OFFICE LAURENCE P. FORMAN, OF OAKMONT‘, PENNSYLVANIA, ASSIGNOR. TO AMERICAN WIN DOW GLASSv QOMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENN SYLVANIA MANUFACTURE OF SHEET GLASS Application ?led February .12, 1930. Serial No. 427,790. This invention relates to the manufacture end portions of the cooler may be left bright of glass and is herein described as applied so as to counteract a tendency toward too to the manufacture of sheet glass by the Four strong cooling on the sheet edges. ' The sheet cault process. - edges are drawn from a cooler portion of the In the drawing of glass in sheet form it is bath, and it is therefore desirable that a necessary to “?x” the sheet by cooling 2. short greater degree of cooling be e?ected at the distance above the line of sheetvgeneration, center. Numerous schemes for effecting a and long, relatively flat‘ coolers are. generally differential rate of cooling across the bath employed for this purpose- The coolers also have been proposed, but all of them are open have an effect upon the bath and are of aid in to numerous objections. They frequently re-' maintaining , a desired temperature condi 15 quire complicated piping and if any slight tion. However, the cooling must be very change in the cooling effect is desired it fre carefully regulated and care must be taken quently. entails a total reconstruction. By that the general temperature of the drawing my invention the differential cooling effect chamber is not unduly reduced by an exces sive circulation of water through the cool _ers. It is desirable from the standpoint of maintaining a high speed of draw to have highly efficient coolers, but from .the' stand point of maintaining the proper temperature conditions in the drawing chamber the cool ing should not be too marked in effect. These over the width of the sheet may be varied ' by the simple expedient of changing the heat absorbing quality of different surface por tions of the cooler. Another advantage which arises from this construction is that the cooler can be made of 70 such size as to give the maximum cooling effect for the sheet itself, since by making the conditions in a measure are opposed to one remainder of the cooler of low heat absorb another, but I have found that the difficulty may be successfully overcome by varying the rate of heat absorption by ‘the cooler over different portions of the surface thereof. Preferably, that face of each cooler adja cent the rising sheet of glass is of such quality ing quality, little difficulty is encountered in maintaining the desired drawing tempera ture. ' In operation I have successfully increased the speed of draw by several inches per min ute with no change in operation except by as to insure a relatively high rate of heat ab the use of my improved cooler. This increase ‘ sorption, while the surface of the remaining in the speed of draw materially increases the portion of the cooler is such as 'to render production of the machine. _ ' the pooler relativelylless e?icient over such In the accompanying drawings illustrat~ portions. The desired effect may be readily ing the present preferred embodiment of the ' obtained by painting different portions of the 40 invention, - The area of the cooler which has its heat, 2, having a debiteuse 3 submerged in the absorbing ‘qualities enhanced by painting bath B of molten glass. The glass sheet S 50 85 cooler with paints having different colors or Figure 1 is a sectional View through a glass capable of forming surfaces having, different drawing chamber showing the coolers in heat absorptive qualities. '_As is well lmown, place; I ' the heat absorptive qualityof a body is de Figure 2 is a top plan view to enlarged termined in a large measure by the character scale of one of the coolers; 90 ' of the surface, and I take advantage of this Figure 3 is a side elevation thereof: and fact in my-improved cooler. I preferably Fisrure 4 is a similar view but showing a approximate so-called “black body”-condi slightly different arrangement. tions on the face of the cooler adjacent the Figure 1 represents a Fourcault drawing sheet and make the remaining surface light unit comprising a drawing chamber, indi- 9 in color and reflective in quality. cated generally by the reference character may be varied as desired, depending on the . is drawn upwardly by means of draft rollers conditions encountered. For instance, {he 4 between the coolers 5. Each cooler com 2 ‘“ 1,880,788 prises a ?at tank-like body 6 having an inlet absorption by the cooler over diiferent por pipe 7 with a portion 8_inside'the body of the tions of the surface thereof by treating the cooler effective for delivering incoming cool different portions of the surface the rate body 6. The cooling water ?ows crosswise ing greaterthan the rate of heat absorption ing water at one of the bottom corners of the of heat absorption from the forme sheet be— and passes out through an exit pipe 9. The. from the bath. . '_ 70 v 3. A cooler for use in glass drawing com pipes 7 and 9 extend beyond the side walls prisin a body having different surface por . of thedrawing chamber 2 and are connected to inlets and outlets inthe usual manner. tions i?erently paintedz - ‘ _ 4. A cooler for use in glass drawing com 75 prising a body having different surface por one side of thebody 6 of the cooler. The I have indicated at 10 a darkened area- on 10 cooler is made up of sheet metal welded to tions painted with paints of different heat gether and is painted all over with aluminum absorbing quality. 5. A cooler for use in glass drawing com paint or the like so as to make the surface 80 15 generally bright and re?ective in quality. prising a body, one part of whose surface 1s ‘ The inlet and outlet pipes are similarly treat-. bright and part of whose surface approxi- ‘ ed. The surface portion 10, however. is made mates that of a black body. 6. A glass drawing apparatus, means for black by applying an overlying paint coat. I have successfully employed a mixture of drawing a sheet of glass from a bath, and a 50% lampblack and 50% ultramarine blue, ' cooler adjacent ‘the line .of travel of the sheet, 85 these two pigments being thoroughly mixed the cooler having different surface portions and applied in a suitable vehicle such as treated in such manner as to produce sur bronzing?uid. Any good vehicle, such as is. faces of different heat absorbing-quality. employed for bronzing or aluminum pow- ~ 7.IA glass drawingagpparatus, means for 90 from a bath, and a ders, may be used. The paint is ‘applied over drawing a sheet of g such portions of the cooler as may be neces cooler adjacent the line of travel of the sheet, sary to give the desired effect. Such area or the cooler having some surface portions . areas actrsubst-antially as black‘bodies and bright and some surface portions dark, the are very e?icient for absorbing heat as com= dark portions approximating a black body. 8. A glass drawing apparatus, means for pared with the remainder of the cooler. In practice, the black faces are placed adjacent drawing a sheet of glass from a‘ bath, and a 80 cooler adjacent the line of travel of‘ the ing effect on the surface of the rising sheet sheet, the cooler having some surface por the rising sheet so as to effect a strong chill without undue cooling of the drawing cham tions bright and some surface portions dark, her. It .will be noted that the end portions of the dark portions being adjacent the rising the cooler body 6 are left unblackened. thus sheet, and approximately a black body. reducing the cooling e?iciencv of the end por “9. A glass drawing apparatus, means for tions. These are the portions which are drawing a sheet of glass from a bath, and a nearest the sheet edges where strong cooling cooler' adjacent the line of travel of the sheet, is not so essential. the cooler having different surface portions - ~' 105 In Figure 4 I have shown a cooler similar painted with paints of di?erent heat absprf ~' - ' to that of Figures 2 and 3. but with the black ‘ ing qualities. 10. In the manufacture of glass, the" step paint arranged in different con?guration. The width of the, paint coat is reduced ad of drawing a glass sheet past a cooler having 110 Mi jacent the end portions so as to still further different portions coated with paints of dif reduce the cooling e?iciency of such end por ferent heat absorptive quality. 11. In the manufacture of glass, the step of drawing a’ glass sheet past a cooler hav > I have illustrated and described a present ing different portions thereof coated with preferred embodiment of the invention as ap 50 paints'of di?erent heat absorptive quality, 115 plied‘ in the Fourcault process. It will be the central portions of the cooler having a ‘understood, however. that the invention is greater coated by paint of high heat ab not limited to the form shown but maybe sorbing area quality than the end'portions. otherwise embodied or practiced within the ‘12. In the manufacture of glass, the step 55. scope of the following claims. of drawing a sheet of glass past a cooler hav 120 I claim: ‘ ‘ ing different parts of the surface thereof ' ' 1“. In the manufacture of glass, the steps treated in such‘ manner as ‘to produce sur consisting in drawing, the glass past a cooler faces of different heat absorbing quality. tions. ' . and varying the rate of heat absorption by, 13. A cooler for use in glass drawing com the cooler over different portions of the sur prising a body having different surface por 125 - vface thereof by treating the different por tions treated differently toproduce surfaces tions of the surface. . _ of different heat absorbing quality. A 2. In the manufacture of glass, the steps In testimony whereof I have hereunto set 60 65 consisting in drawing the glass from a bath past a cooler and varying the rate of’heat my hand._ LAURENCE P. FORMAN. . 130
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