polymerguru

𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 𝐋𝐮𝐛𝐫𝐢𝐜𝐚𝐧𝐭𝐬 𝐜𝐚𝐧 𝐦𝐚𝐤𝐞 𝐚 𝐠𝐨𝐨𝐝 𝐏𝐕𝐂 𝐬𝐭𝐚𝐛𝐢𝐥𝐢𝐳𝐞𝐫 𝐥𝐨𝐨𝐤 𝐛𝐚𝐝. 𝐀𝐧𝐝 𝐭𝐡𝐢𝐬 𝐢𝐬 𝐰𝐡𝐞𝐫𝐞 𝐦𝐚𝐧𝐲 𝐟𝐨𝐫𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧𝐬 𝐠𝐨 𝐰𝐫𝐨𝐧𝐠. The stabilizer gets blamed. But the real problem may be the lubricant system. In PVC, lubricants are not just “flow helpers.” They control: • fusion speed • melt viscosity • metal release • particle coating • die flow • surface finish • residence time • heat history But when the lubricant balance is wrong, it can reduce the apparent efficiency of the stabilizer. Not always by chemically “killing” it. Often by stopping it from doing its job at the right time and place. Here is how it happens: 1. Over-lubrication delays fusion If the PVC particles stay too well separated for too long, heat transfer and gelation slow down. The stabilizer may be present. But the compound spends more time under heat before proper fusion. That increases stabilizer demand. 2. Poor incorpo...

𝐒𝐮𝐧𝐝𝐚𝐲'𝐬 𝐓𝐇𝐎𝐔𝐆𝐇𝐓𝐅𝐔𝐋 𝐏𝐨𝐬𝐭 𝐖𝐚𝐬𝐭𝐞 𝐈𝐬 𝐍𝐨𝐭 “𝐀𝐰𝐚𝐲” 𝐄𝐯𝐞𝐫𝐲 𝐢𝐭𝐞𝐦 𝐰𝐞 𝐭𝐡𝐫𝐨𝐰 𝐚𝐰𝐚𝐲 𝐠𝐨𝐞𝐬 𝐬𝐨𝐦𝐞𝐰𝐡𝐞𝐫𝐞. A plastic bottle tossed today may remain on this planet for hundreds of years. A single-use cup used for minutes can pollute oceans, harm wildlife, and damage ecosystems for generations. The truth is simple: The best waste is the waste we never create. That is why the Waste Hierarchy matters more than ever. ♻️ Reduce before you recycle. 🔄 Reuse before you replace. 🧴 Refill instead of rebuying. 🛠 Repair instead of discarding. 🌱 Repurpose creatively. 📦 Recycle responsibly. 🗑 Use landfill only as the final option. Small daily choices create massive global impact. Bring a reusable bottle. Say no to unnecessary packaging. Choose durable products. Support circular economy businesses. Separate waste correctly. Think beyond convenience. Sustainability is not about perfection. It is about millions of people making better decisions co...

  𝐃𝐞𝐧𝐬𝐢𝐭𝐲 𝐨𝐟 𝐏𝐥𝐚𝐬𝐭𝐢𝐜 𝐌𝐚𝐭𝐞𝐫𝐢𝐚𝐥𝐬 source : Sanjay Saxena

𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 𝑻𝒉𝒆 𝒅𝒆𝒔𝒊𝒈𝒏 𝒐𝒇 𝒂 𝒄𝒐𝒎𝒑𝒐𝒖𝒏𝒅𝒊𝒏𝒈 𝒆𝒙𝒕𝒓𝒖𝒅𝒆𝒓 𝒄𝒂𝒏 𝒎𝒂𝒌𝒆 𝒕𝒉𝒆 𝒅𝒊𝒇𝒇𝒆𝒓𝒆𝒏𝒄𝒆 𝒃𝒆𝒕𝒘𝒆𝒆𝒏 𝒂 𝒔𝒕𝒂𝒃𝒍𝒆 𝒑𝒓𝒐𝒄𝒆𝒔𝒔 𝒂𝒏𝒅 𝒂 𝒑𝒓𝒐𝒅𝒖𝒄𝒕𝒊𝒐𝒏 𝒍𝒊𝒏𝒆 𝒇𝒖𝒍𝒍 𝒐𝒇 𝒄𝒉𝒂𝒍𝒍𝒆𝒏𝒈𝒆𝒔. For 𝐡𝐞𝐚𝐭-𝐬𝐞𝐧𝐬𝐢𝐭𝐢𝐯𝐞 𝐟𝐨𝐫𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧𝐬 such as XLPE cable compounds and highly filled systems, 𝐜𝐨-𝐤𝐧𝐞𝐚𝐝𝐢𝐧𝐠 𝐞𝐱𝐭𝐫𝐮𝐝𝐞𝐫𝐬 offer a unique processing advantage. 𝐔𝐧𝐥𝐢𝐤𝐞 𝐜𝐨𝐧𝐯𝐞𝐧𝐭𝐢𝐨𝐧𝐚𝐥 𝐭𝐰𝐢𝐧-𝐬𝐜𝐫𝐞𝐰 𝐞𝐱𝐭𝐫𝐮𝐝𝐞𝐫𝐬 that rely on intensive shear, co-kneaders combine low shear with intensive distributive mixing, resulting in excellent homogenization while minimizing thermal and mechanical degradation. Their continuous reciprocating screw movement renews the material surface during processing, 𝐞𝐧𝐬𝐮𝐫𝐢𝐧𝐠 𝐞𝐟𝐟𝐢𝐜𝐢𝐞𝐧𝐭 𝐝𝐢𝐬𝐩𝐞𝐫𝐬𝐢𝐨𝐧 of fillers, pigments, additives, and stabilizers without exposing the polymer to excessive shear stress. 𝐓𝐲𝐩𝐢...

𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 𝐔𝐧𝐝𝐞𝐫𝐬𝐭𝐚𝐧𝐝𝐢𝐧𝐠 𝐑𝐞𝐟𝐫𝐚𝐜𝐭𝐢𝐯𝐞 𝐈𝐧𝐝𝐞𝐱 The refractive index (RI) of a polymer is the ratio of the speed of light in a vacuum to the speed of light through the polymer. It varies with frequency (and thus wavelength) of light. Typically, it is measured at well-defined spectral wavelengths; for example, the yellow sodium double emission at 589nm wavelength. As other properties, refraction indices are temperature dependent. RI of air and water are 1.0 and 1.31 respectively. 𝐓𝐡𝐫𝐞𝐞 𝐩𝐫𝐨𝐩𝐞𝐫𝐭𝐢𝐞𝐬 𝐨𝐟 𝐩𝐨𝐥𝐲𝐦𝐞𝐫𝐬 𝐚𝐫𝐞 𝐫𝐞𝐥𝐚𝐭𝐞𝐝 𝐭𝐨 𝐭𝐡𝐞𝐢𝐫 𝐫𝐞𝐟𝐫𝐚𝐜𝐭𝐢𝐯𝐞 𝐢𝐧𝐝𝐞𝐱: Light rays change direction when they cross the interface from air to the polymer. Light reflects partially from surfaces that have a refractive index different from that of their surroundings. The dispersive effect due to the diversity of the wavelengths of the light, the bending effect being frequency dependent.   The lower the ...