𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 : 𝗛𝘆𝗽𝗲𝗿𝗣𝗘𝗧 𝐢𝐬 𝐭𝐡𝐞 𝐨𝐧𝐥𝐲 𝐦𝐞𝐜𝐡𝐚𝐧𝐢𝐜𝐚𝐥 𝐏𝐄𝐓 𝐮𝐩𝐜𝐲𝐜𝐥𝐢𝐧𝐠 𝐬𝐲𝐬𝐭𝐞𝐦 𝐭𝐡𝐚𝐭 𝐩𝐞𝐫𝐟𝐨𝐫𝐦𝐬 𝐭𝐡𝐞 𝐞𝐧𝐭𝐢𝐫𝐞 𝗦𝗼𝗹𝗶𝗱 𝗦𝘁𝗮𝘁𝗲 𝗣𝗼𝗹𝘆𝗰𝗼𝗻𝗱𝗲𝗻𝘀𝗮𝘁𝗶𝗼𝗻 (𝗦𝗦𝗣) 𝐩𝐡𝐚𝐬𝐞 𝗯𝗲𝗳𝗼𝗿𝗲 𝗲𝘅𝘁𝗿𝘂𝘀𝗶𝗼𝗻.

𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞

𝗛𝘆𝗽𝗲𝗿𝗣𝗘𝗧 𝐢𝐬 𝐭𝐡𝐞 𝐨𝐧𝐥𝐲 𝐦𝐞𝐜𝐡𝐚𝐧𝐢𝐜𝐚𝐥 𝐏𝐄𝐓 𝐮𝐩𝐜𝐲𝐜𝐥𝐢𝐧𝐠 𝐬𝐲𝐬𝐭𝐞𝐦 𝐭𝐡𝐚𝐭 𝐩𝐞𝐫𝐟𝐨𝐫𝐦𝐬 𝐭𝐡𝐞 𝐞𝐧𝐭𝐢𝐫𝐞 𝗦𝗼𝗹𝗶𝗱 𝗦𝘁𝗮𝘁𝗲 𝗣𝗼𝗹𝘆𝗰𝗼𝗻𝗱𝗲𝗻𝘀𝗮𝘁𝗶𝗼𝗻 (𝗦𝗦𝗣) 𝐩𝐡𝐚𝐬𝐞 𝗯𝗲𝗳𝗼𝗿𝗲 𝗲𝘅𝘁𝗿𝘂𝘀𝗶𝗼𝗻.

This strategic choice – apparently simple – actually delivers concrete advantages on multiple levels.

✅ 𝗘𝗡𝗘𝗥𝗚𝗬 𝗦𝗔𝗩𝗜𝗡𝗚𝗦 𝗧𝗛𝗥𝗢𝗨𝗚𝗛 𝗔 𝗖𝗢𝗡𝗦𝗜𝗦𝗧𝗘𝗡𝗧 𝗧𝗛𝗘𝗥𝗠𝗔𝗟 𝗣𝗥𝗢𝗚𝗥𝗘𝗦𝗦𝗜𝗢𝗡.

Positioning the SSP before extrusion allows the polymer to follow a 𝗰𝗼𝗵𝗲𝗿𝗲𝗻𝘁 𝘁𝗵𝗲𝗿𝗺𝗮𝗹 𝗽𝗿𝗼𝗴𝗿𝗲𝘀𝘀𝗶𝗼𝗻 across all process phases: from the initial crystallization (>140°C), to the Solid State Polycondensation (>200°C), to extrusion (>250°C) and finally to the post-crystallization (~140°C) of the pellet - 𝘵𝘩𝘦 𝘩𝘦𝘢𝘵 𝘢𝘤𝘤𝘶𝘮𝘶𝘭𝘢𝘵𝘦𝘥 𝘪𝘯 𝘦𝘢𝘤𝘩 𝘱𝘩𝘢𝘴𝘦 𝘪𝘴 𝘤𝘰𝘯𝘴𝘪𝘴𝘵𝘦𝘯𝘵𝘭𝘺 𝘳𝘦𝘶𝘴𝘦𝘥 𝘪𝘯 𝘵𝘩𝘦 𝘯𝘦𝘹𝘵 𝘰𝘯𝘦.

Conversely, in configurations where the SSP is located after extrusion, the material – once pelletized and kept at ~140°C for post-crystallization – must be reheated above 200°C for polycondensation and then cooled again.

This double thermal cycle represents a clear point of energy waste.

The 𝗛𝘆𝗽𝗲𝗿𝗣𝗘𝗧 system by MAS Tech eliminates this inefficiency, maximizing the overall energy performance of the process.

✅ 𝗙𝗜𝗡𝗔𝗟 𝗣𝗢𝗟𝗬𝗠𝗘𝗥 𝗖𝗥𝗬𝗦𝗧𝗔𝗟𝗟𝗜𝗡𝗜𝗧𝗬 𝗢𝗙 𝟯𝟳–𝟰𝟬% = 𝗘𝗡𝗘𝗥𝗚𝗬 𝗦𝗔𝗩𝗜𝗡𝗚𝗦 𝗜𝗡 𝗜𝗡𝗝𝗘𝗖𝗧𝗜𝗢𝗡 𝗠𝗢𝗟𝗗𝗜𝗡𝗚 𝗔𝗡𝗗 𝗘𝗫𝗧𝗥𝗨𝗦𝗜𝗢𝗡.

In the 𝗛𝘆𝗽𝗲𝗿𝗣𝗘𝗧 configuration – with the SSP placed upstream – the pellets are no longer exposed to high temperatures after extrusion.

This prevents the so-called “𝘴𝘦𝘤𝘰𝘯𝘥𝘢𝘳𝘺 𝘤𝘳𝘺𝘴𝘵𝘢𝘭𝘭𝘪𝘻𝘢𝘵𝘪𝘰𝘯”.

The result is a lower polymer 𝗰𝗿𝘆𝘀𝘁𝗮𝗹𝗹𝗶𝗻𝗶𝘁𝘆 – in the 𝟯𝟳–𝟰𝟬% range – which, in subsequent injection-molding or extrusion processes, provides immediate 𝗲𝗻𝗲𝗿𝗴𝘆 𝘀𝗮𝘃𝗶𝗻𝗴𝘀, as 𝘢 𝘭𝘦𝘴𝘴 𝘤𝘳𝘺𝘴𝘵𝘢𝘭𝘭𝘪𝘯𝘦 𝘮𝘢𝘵𝘦𝘳𝘪𝘢𝘭 𝘳𝘦𝘲𝘶𝘪𝘳𝘦𝘴 𝘭𝘦𝘴𝘴 𝘦𝘯𝘦𝘳𝘨𝘺 𝘵𝘰 𝘮𝘦𝘭𝘵.

A PET with crystallinity 𝗮𝗯𝗼𝘃𝗲 𝟱𝟬%, as typically produced by systems placing the SSP after pelletizing, does not offer any real benefit to the material itself nor to its end-user.

✅ 𝗠𝗔𝗧𝗘𝗥𝗜𝗔𝗟 𝗤𝗨𝗔𝗟𝗜𝗧𝗬 𝗔𝗡𝗗 𝗦𝗖𝗥𝗔𝗣 𝗣𝗥𝗘𝗩𝗘𝗡𝗧𝗜𝗢𝗡.

Having the SSP before extrusion also allows the 𝗶𝗻𝘁𝗿𝗶𝗻𝘀𝗶𝗰 𝘃𝗶𝘀𝗰𝗼𝘀𝗶𝘁𝘆 (𝗜𝗩) of the polymer to be optimized before it is converted into a final product.

In this way – unlike systems that place the SSP after extrusion – bottlenecks or “double passes” in the polycondensation reactor are avoided, preventing the corrective cycles often required to reach the final IV target.

Similarly, potential 𝗰𝗼𝗹𝗼𝗿 issues can be corrected before extrusion, preventing – as sometimes happens – the “yellowing reflowering” during SSP on pellets, which can otherwise result in tons of scrap.

source : Christian Schiavolin