Process for producing polarizing film and apparatus for producing polarizing film
A manufacturing method and manufacturing device technology, applied in the field of polarizing film manufacturing and manufacturing devices, capable of solving problems such as insufficient durability and easy shrinkage of polarizing films
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Embodiment 1
[0114] use figure 1 The production apparatus shown produces the polarizing film of Example 1 from a polyvinyl alcohol-type resin film. Specifically, a long polyvinyl alcohol (PVA) original roll film [KURARAY CO., LTD., trade name "KURARAYVINYLON VF-PE#6000" with a thickness of 60 μm, an average degree of polymerization of 2400, and a degree of saponification of 99.9 mol% or more] was conveyed continuously while unwinding from a roll, and immersed in a swelling bath containing 30° C. pure water for a residence time of 79 seconds (swelling step). Thereafter, the membrane pulled out from the swelling bath was immersed in a 30°C dyeing bath containing iodine at a potassium iodide / boric acid / water ratio of 1 / 0.3 / 100 (weight ratio) for a residence time of 123 seconds (staining step). Next, the film pulled out from the dyeing bath was immersed in the first cross-linking bath at 53° C. with a residence time of 44 seconds in potassium iodide / boric acid / water of 11 / 2.0 / 100 (weight rati...
Embodiment 2～6、 comparative example 3、4
[0121] In the electromagnetic wave irradiation process, in addition to the type of electromagnetic wave irradiator, the output power (%), and the electromagnetic wave irradiation heat per unit volume of the film, boric acid in the first crosslinking bath and the second crosslinking bath relative to 100 parts by weight of water Except that the parts by weight are shown in Table 2, a polarizing film was obtained in the same manner as in Example 1. The obtained polarizing films all had a thickness of 23 μm. As the electromagnetic wave irradiator, a halogen heater (product name: straight-tube halogen heating lamp QIR, manufactured by USHIO LIGHTING, INC., heat source temperature 2600°C, maximum energy density 300kW / m 2 ), short-wavelength infrared heater (SW heater) (product name: Golden 8 Short-wave twin tube emitter, manufactured by Heraeus, heat source temperature: 2200°C, maximum energy density: 200kW / m 2), high-speed response mid-wavelength infrared heater (FRMW heater) (pro...
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