<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1447966691641_14164" dir="ltr"><span id="yui_3_16_0_1_1447966691641_15522">as i recall...and im old</span></div><div id="yui_3_16_0_1_1447966691641_14164" dir="ltr"><span><br></span></div><div id="yui_3_16_0_1_1447966691641_14164" dir="ltr"><span id="yui_3_16_0_1_1447966691641_15405">first thing to be done was to build a polished steel buck.</span></div><div id="yui_3_16_0_1_1447966691641_14164" dir="ltr"><span id="yui_3_16_0_1_1447966691641_15521">the glass would be cut to shape.</span></div><div id="yui_3_16_0_1_1447966691641_14164" dir="ltr"><span id="yui_3_16_0_1_1447966691641_15491">then carefully clamped to the buck and put into an oven where the glass was heated until it slumped and settled on the buck. this is why you often saw distortion.</span></div><div id="yui_3_16_0_1_1447966691641_14164" dir="ltr"><span id="yui_3_16_0_1_1447966691641_16651">after the hot slump the glass was allowed to cool slowly for annealed or quenched quickly with "cool" air for tempered glass. very little tempered glass went into laminated car windshields.</span></div><div id="yui_3_16_0_1_1447966691641_14164" dir="ltr"><span><br></span></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15635">it required 2 bucks one for the outer light and one for the inner light.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15636">both having slightly different radi.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15636">smart folks developed bucks with a crank that could change the curve slightly if it was not a compound.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15637"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15638">then one light of glass would have the PVB inter layer placed over it. it would have been slightly oversize for the size of the glass.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15639"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">carefully 2 guys would place the second light of glass onto the first glass & PVB so that the edges lined up properly.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">touch at one end and kinda roll the glass into place.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">manual roller firm but not heavy across the glass.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">there would often be small air pockets visible at this time. and even today in manual lines you still see some small air pockets at this stage.<br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">the PVB is not intentionally sticky but does cling enough to hold the glass together now</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">the assembly then as now went into an autclave stacked on edge.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">steam is pumped into the autoclave and pressurized to force the 2 lights of glass together. the hot steam softening the PVB and allowing it to absorb the small air pockets that may have been present and take up irregularities in the curve difference of the 2 glass lights..</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">allow to cool gently.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">knife off the laminate that was oversize.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">its funny how the PVB sucks up some of the small air particles. i have often though that's why we start to see bubbling around the edges of old laminates.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">there are i believe, some old time fabricators who can still make laminates this old way but i expect they want big bucks.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">im not sure when better automated machinery took over. it had to have been after the war. to start producing cars at the rate we did this was not an efficient process.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">today we are messing with "cold bending" glass. trying to get it to take shape using less energy. but like vacuum formed insulating glass we are only in research and development.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">we recently ran a series of tests on some glass products here with general contractors, architects and building owners present.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668">one contractor noted it was the boring day he had spent watching a test.</div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div><div dir="ltr" id="yui_3_16_0_1_1447966691641_15668"><br></div> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1447966691641_14167"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1447966691641_14166"> <div dir="ltr" id="yui_3_16_0_1_1447966691641_14168"> <hr size="1" id="yui_3_16_0_1_1447966691641_15490"> <font size="2" face="Arial" id="yui_3_16_0_1_1447966691641_15409"> <b id="yui_3_16_0_1_1447966691641_15408"><span style="font-weight:bold;" id="yui_3_16_0_1_1447966691641_15407">From:</span></b> Randall <TR3driver@ca.rr.com><br> <b><span style="font-weight: bold;">To:</span></b> 'Triumphs List' <triumphs@autox.team.net> <br> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, November 19, 2015 1:43 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [TR] Broken Windshield<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1447966691641_14165"><br>> Is it possible to have this repaired <br clear="none"><br clear="none">Sure, it's possible. First you melt the glass down ...<br clear="none"><br clear="none">Which leads me to an odd question : Does anyone know what the manufacturing process would have been back then? Roll the glass out<br clear="none">flat and then curve it during the tempering or laminating process?<br clear="none"><br clear="none">Randall Y.<div class="qtdSeparateBR"><br><br></div><div class="yqt2420898632" id="yqtfd87135"><br clear="none"><br clear="none"><br clear="none">** <a shape="rect" ymailto="mailto:triumphs@autox.team.net" href="mailto:triumphs@autox.team.net">triumphs@autox.team.net</a> **<br clear="none"><br clear="none">Donate: <a shape="rect" href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br clear="none">Archive: <a shape="rect" href="http://www.team.net/archive" target="_blank">http://www.team.net/archive</a><br clear="none">Forums: <a shape="rect" href="http://www.team.net/forums" target="_blank">http://www.team.net/forums</a><br clear="none">Unsubscribe/Manage: <a shape="rect" href="http://autox.team.net/mailman/options/triumphs/yellowtr3@yahoo.com" target="_blank">http://autox.team.net/mailman/options/triumphs/yellowtr3@yahoo.com</a><br clear="none"></div><br><br></div> </div> </div> </div></body></html>