Casting head for solution preparing of film

A solution film forming and casting die technology, applied in the direction of coating, etc., can solve the problems of foreign matter adhesion failure, support peeling residue, and productivity reduction.

Inactive Publication Date: 2002-02-06
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, these methods are easily affected by the wind speed or temperature conditions around the die lip, etc., and it is difficult to control the gas concentration or the position where the solvent flows down, so the occurrence of skinning cannot be reliably suppressed
That is, if the gas concentration is low, skinning will occur, and even if the saturated concentration is maintained, dew condensation will occur due to temperature fluctuations around the die, causing defects in the appearance of the film
In addition, when the solvent flows down, the dope discharge part in the front end of the lip is wetted and widened in the width direction, so excess solvent is formed, peeling residue occurs on the support, and it becomes a cause of foreign matter adhesion failure, etc.
If flaking residue occurs on the support, the casting speed will be reduced and the support will have to be washed, resulting in a significant decrease in productivity

Method used

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  • Casting head for solution preparing of film
  • Casting head for solution preparing of film
  • Casting head for solution preparing of film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Single-layer casting was performed under the following conditions. A backing plate with a curved cross-sectional shape is inserted into the lip end.

[0107] 1) The angle θ=120 degrees formed by the lip surface and the lip side

[0108] 2) The minimum radius of curvature of the lip side = 0.5mm

[0109] Skin formation occurred at 2 minutes. The amount of occurrence is small, and the crust is difficult to grow into an icicle shape. Almost no peeling on the support

[0110] away from residual dirt.

Embodiment 2

[0112] Single-layer casting was performed under the following conditions. A backing plate with a curved cross-sectional shape is inserted into the lip end.

[0113] 1) The angle θ=150 degrees formed by the lip surface and the lip side

[0114] 2) The minimum radius of curvature of the lip side = 0.5mm

[0115]Skin formation occurred at 20 minutes. The amount of occurrence is small, and the crust is difficult to grow into an icicle shape. almost no support

[0116] Peel off residual dirt.

Embodiment 3

[0118] Single-layer casting was performed under the following conditions. Machine the lip itself into a curved surface.

[0119] 1) The tangent line from the side of the lip is consistent with the lip surface, forming a smooth curve with no step height difference.

[0120] 2) The minimum radius of curvature of the lip side = 0.5mm

[0121] No skinning occurred even after 60 minutes. There was little to no peel residue dirt on the support.

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Abstract

A method to increase productivity by preventing skinning, to avoid cleaning the peel-off remnants due to the inefficient periodic drying of the peel-off point on the support and to eliminate the hostile influence on the casting head. The subject of this invention is to solve the problem by a casting head for solution preparing of film, and the casting head with an angle theta of more than 120 DEG between mouth surface and mouth side surface on the cross-section of the two ends belong to the front part of mouth section.

Description

technical field [0001] The present invention relates to a casting die for solution film forming of a polymer resin film, and more specifically, to a casting die for preventing skinning at both ends in the width direction of the casting die during solution film forming. Background technique [0002] Generally, a part of a support film such as cellulose acetate, polycarbonate, or cellophane is produced by a solution film-forming method. exist Figure 20 In this solution film forming method, the state of casting the polymer solution (dope) from the die 1 is shown in , and in Figure 21 The shape of the end portion of the slit 13 of the dope discharge port of the die head 1 is shown in . Such as Figure 21 As shown, the corner portion of the end of the slit 13 forms a right angle. In most cases, the ends of the casting die lip, due to the drying of the dope, such as Figure 20 As shown, skinning 23 occurs. This crust grows in the shape of icicles at both ends of the tip of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C41/34
Inventor 片井幸祐辻本忠宏熊沢孝生
Owner FUJIFILM CORP
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