http://ir-heat-shop.com/en/tags/thermal/ Recent content in Thermal on The IR Heat Online Shop Hugo en-us Thu, 30 Jul 2026 10:47:41 +0800 http://ir-heat-shop.com/en/posts/solving-batch-variance-in-glass-annealing-via-high-consistency-ir-heating/ Thu, 30 Jul 2026 10:47:41 +0800 http://ir-heat-shop.com/en/posts/solving-batch-variance-in-glass-annealing-via-high-consistency-ir-heating/ <p><img src="http://ir-heat-shop.com/images/b5656277f58cb00419575fab5c447582.png" alt="Thermal stress glass cutting"></p> <h1 id="why-your-ir-lamps-are-probably-messing-up-your-glass">Why Your IR Lamps are Probably Messing Up Your Glass</h1> <p>Glass annealing is all about precision. If your temperatures are off by even a tiny bit across the surface, you&rsquo;re looking at warping or cracks you didn&rsquo;t see coming. It&rsquo;s a headache. The real culprit? Your IR lamps. If they aren&rsquo;t putting out the exact same amount of heat, your batch stability just vanishes.</p> <h2 id="the-cold-spot-nightmare">The &ldquo;Cold Spot&rdquo; Nightmare</h2> <p>A lot of people think of IR lamps as simple on/off switches. They aren&rsquo;t. Imagine two lamps in the same bank. If one is pulling just 2% less wattage than the other, you&rsquo;ve got a cold spot. In a big batch, this means the first piece of glass gets a totally different heat treatment than the tenth piece. We call this &ldquo;drift.&rdquo; It usually happens because the filament wasn&rsquo;t centered perfectly or the quartz thickness is a bit wonky from the factory. It&rsquo;s a small detail that causes a huge mess.</p>