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PET瓶胚注塑機與標準注塑機有什麼差別?

專業人士 PET瓶坯注塑機 與通用標準注塑機有本質區別, 因為它經過獨特設計，適應 PET 樹脂的特殊物理和化學特性,

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專業人士 PET瓶坯注塑機 與通用標準注塑機有本質區別, 因為它經過獨特設計，適應 PET 樹脂的特殊物理和化學特性, 普通機器無法完全適應的. PET材質具有高吸濕性, 敏感的熱降解, 低熔體黏度, 對塑化均勻性和成型速度有嚴格要求, 所有這些都需要專門的機器配置. 首先也是最重要的, 塑化系統完全不同. PET瓶坯機配備專用的低剪切螺桿和機筒，長徑比為 24:1 到 26:1, 淺螺槽、無死角設計. This structure avoids excessive shearing force that causes PET molecular chain breakage, effectively preventing melt yellowing, carbonization, and transparency reduction during high-temperature processing. 相比之下, standard injection machine screws are designed for universal plastics like PP and ABS, generating excessive shear heat that easily degrades PET materials and produces defective preforms with yellow streaks and haze. 其次, the temperature control system of PET preform machines supports multi-stage precise PID constant temperature control, covering the barrel, 噴嘴, and mold adapter with a temperature error controlled within ±1°C. Since PET processing temperature ranges from 260°C to 285°C, even minor local overheating will trigger acetaldehyde proliferation and material aging, a problem that ordinary machines with rough temperature control cannot avoid. 而且, PET preform production requires high-speed thin-wall filling and high-rigidity clamping to ensure uniform mold locking and prevent flash on multi-cavity preforms. Professional preform machines adopt reinforced high-rigidity templates and high-response fast injection systems, achieving stable high-speed filling within 0.1 秒, while standard machines have slow injection response and insufficient clamping rigidity, leading to uneven preform wall thickness and low yield. 此外, dedicated PET machines are optimized for short material residence time, with streamlined flow channels and anti-stagnation nozzle structures to reduce melt retention and degradation. They also reserve professional interfaces for supporting equipment such as dehumidifying dryers and industrial chillers, forming a complete PET molding production system. Standard injection machines lack these targeted optimizations, resulting in low production efficiency, high defective rates, and inability to meet food-grade preform production standards. 總之, ordinary injection machines can only complete simple plastic molding, while professional PET preform machines focus on high transparency, low acetaldehyde, high yield, and high-speed mass production, fully matching the strict process requirements of PET preform manufacturing.

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