Shrinkable film and method for manufacturing same
A shrink film, degradable film technology, used in chemical instruments and methods, synthetic resin layered products, transportation and packaging, etc., can solve problems such as increased film opacity, aluminum delamination or separation, and reduced productivity, to achieve uniform shrinkage sexual effect
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Embodiment 1
[0043] 60% of polylactic acid resin as a raw material resin, polylactone (DAICELL Chemical Company, Celgreen), and silica having an average particle size of 2.7 μm so as to be 450 ppm in the final film were added and then blended to prepare a masterbatch. The masterbatch was dried at 110°C for 2 hours using a hot air dryer, melted and extruded at 200°C, and then rapidly cooled and solidified by a cooling roll at 25°C, thereby preparing an unstretched film.
[0044] The water-dispersed polyurethane coating composition was coated on one surface of the unstretched film by an in-line coating (ILC) process so that the coating thickness after drying thereof was 0.04 μm. The water-dispersible polyurethane coating composition contained 0.8 wt% polyurethane resin solids (DKC, Superflex 210), 0.1 wt% silicon-based wetting agent (DowCorning, Q2-5212) and the balance water.
[0045] The unstretched film coated with the water-dispersed polyurethane coating composition was passed through a ...
Embodiment 2
[0048] A film was produced in the same manner as in Example 1 except that 45 wt % of polylactone was used to prepare the masterbatch, and the physical properties of the film are shown in Table 1.
Embodiment 3
[0050] A film was produced in the same manner as in Example 1 except that 30 wt% of polylactone was used to prepare the masterbatch, and the physical properties of the film are shown in Table 1.
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