A semicrystalline copolyester resin composition formed by twin screw extrusion of various ingredients includes copolyester resins, antiblock, slip and antifog additives. This semicrystalline copolyester resin can be extruded on to PET film or coextruded with PET resin to form clear PET films with antifog properties. These films with antifog properties are produced in a single step without the use of solvent and does not involve any secondary step for coating a separate antifog layer. This minimizes the cost and time required by a converter to make such clear antifog films. These films containing the heat seal copolyester resin can be heat sealed to clear APET trays. Contents within the trays, such as food, can be seen without fogging on the inside of the film that is used to seal the tray. The seals are strong and the peels are smooth giving a very good packaging performance.
通过双螺杆挤压形成的半结晶共聚聚酯
树脂组合物含有多种成分,包括共聚聚酯
树脂、抗阻塞剂、防滑剂和防雾添加剂。这种半结晶共聚酯
树脂可挤压到 PET 薄膜上,或与 PET
树脂共挤,形成具有防雾性能的透明 PET 薄膜。这些具有防雾性能的薄膜只需一道工序即可生产,无需使用溶剂,也不涉及涂覆单独防雾层的第二道工序。这就最大限度地降低了薄膜加工商生产这种透明防雾薄膜所需的成本和时间。这些含有热封共聚聚酯
树脂的薄膜可以热封在透明的 APET 托盘上。在用于密封托盘的薄膜内侧,可以看到托盘中的食品等内容物,而不会起雾。封口牢固,剥离平滑,具有非常好的包装性能。