Spinneret plate with multiple inner hole flow channels and application of spinneret plate

Abstract

The invention belongs to the field of hollow fiber membrane preparation, and particularly relates to a spinneret plate with multiple inner hole flow channels and application of the spinneret plate. The spinneret plate with the multiple inner hole flow channels comprises a spinneret plate body. A plurality of spinneret passages as the spinning fluid flow channels are uniformly distributed on the spinneret plate body. N inner hole passages are uniformly arranged in the spinneret passages in an array, wherein N is an integer greater than or equal to 2. The inner hole passages are used as the channels of core liquid, air or a linear reinforcement body, and the outer contour of the cross section of each inner hole flow channel is in a circle shape. Compared with the conventional art design thatthe number of the inner hole channels is usually one, the number of the inner hole channels is designed to be greater than or equal to 2 so that the packing density of the hollow fiber membrane filaments is increased without reducing the internal pressure filtration area to get more rigid porous hollow fiber internal pressure membrane filaments.

Description

technical field [0001] The invention belongs to the field of hollow fiber membrane preparation, and in particular relates to a spinneret with multi-hole flow channels and its application. Background technique [0002] The spinnerets used in conventional hollow fibers or hollow fiber membranes are mainly annular spinnerets, in which the inner ring is used as the inner hole flow channel to pass into the core liquid, the outlet of the air flow channel or the outlet of the reinforcement, etc., and the outer hole As the flow channel outlet of spinning fluid (including spinning dope and spinning melt, etc.). There is also a concentric double-annular spinneret, and an additional layer of rings is added on the basis of the above-mentioned conventional spinneret, which is used for the mutual compounding of different matrix phases or spinning fluids with different viscosities. [0003] The hollow fiber or hollow fiber membrane prepared by the above-mentioned technology has the follow...

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Problems solved by technology

[0003] The hollow fiber or hollow fiber membrane prepared by the above-mentioned technology has the following problems: ① For the external pressure membrane, the contradiction between the filling density and the strength of the hollow fiber membrane cannot be solved. In other words, in order to improve the strength of the hollow fiber membrane, the wall thickness of the resulting hollow fiber membrane must be increased, but this will inevitably reduce the packing density of the membrane module, resulting in a decrease in module efficiency; The relationship between the filling density of the fiber membrane and the unobstructed flow channel specifically refers to the smoothness of the hollow fiber inner pressure membrane flow channel is affected by the rigidity of the membrane filament. Relatively speaking, the stronger the rigidity of the membrane filament, the straighter and smoother the flow channel. Increasing the packing density and reducing the outer diameter of the membrane filament will inevitably lead to an increase in the flexibility of the membrane filament, resulting in an increase in flow channel resistance

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