Method for manufacturing product on a film substrate at a temperature above its glass transition
A glass transition, thin film technology that can be used in final product manufacturing, sustainable manufacturing/processing, electroluminescent light sources, etc., to solve problems such as mechanical distortion of polymer substrates
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example 1
[0029] Several properties of interest in the manufacture of optical films were determined on 0.123 mm thick samples of biaxially oriented PEN film (commercially available as Q65FA from DuPont Technological Films, Hopeville, VA). Specifically, its transmittance (T, %) was measured to be 89.5. Its haze (H, %) was measured to be 0.99. Its transparency (C, %) was measured as 100. Transmission and haze are measured according to ASTM D-1003. transparency based on Plus (available from BYK-Garner USA, Silver Spring, Md.) manual, the test method was measured.
[0030] As a control experiment, a square material measuring 30 cm x 30 cm was cut from this material so that the biaxial orientation of the film was aligned with the cutting axis. The part was heated at a temperature of 240° C. for 5 minutes (simulating a high temperature OLED / PLED processing step). This step was performed in an oven set at 240°C, where the film was suspended without restraint or tension.
[0031] After t...
example 2
[0033] Fix different parts of the film in Example 1 to figure 1 Shown on a square aluminum frame. The clamps generate a vertical pressure of 3–6 MPa, respectively, which, due to the geometry of the film clamping surfaces, generates almost zero tension in the film along the axis defined by the biaxial orientation. The clamped film was subjected to a 15 second conditioning cycle at 240°C in the same oven as in Example 1. During conditioning, the film undergoes thermal expansion followed by contraction to form a smooth film that tightly fits the frame geometry. The conditioning cycle is chosen so that the temperature is high enough to initiate some shrinkage of the film, while the time is short enough that the internal stresses in the film are not fully released. Next, the conditioned film, still clamped in the frame, was heat-treated at 240° C. for 5 minutes under other conditions identical to those of Example 1. Thermal shrinkage and optical properties were then measured ac...
example 3
[0035]Experiments were performed essentially as in Example 2, except that the films were removed from the jig before measuring heat shrinkage and optical properties. Specifically, after heat treatment and removal from the jig, the shrinkage of the film was 0.56% in the transverse direction and 0.01% in the machine direction, which was significantly lower than that of the free-standing film shown in Example 1. Optical properties before and after thermal processing were also measured by the method described in Example 1, and it was found that these properties did not change after processing. The resulting film had no visible curling or distortion. Examples 1-3 show that at least a bare substrate can be avoided from curling and deformation during processing beyond its glass transition temperature by using a clamp according to the invention. Examples 4-6 describe further aspects of the invention wherein the substrate has a barrier layer pre-applied on one surface.
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Abstract
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