Polylactic acid matte fiber direct spinning system

Abstract

The invention discloses a direct spinning system for polylactic acid extinction fiber. The direct spinning system comprises a polymerization frame and a spinning box body, wherein a stirring tank, a primary polymerization tank and a final polymerization tank are arranged in sequence from top to bottom on the polymerization frame; the bottom of the stirring tank is communicated with the top of the primary polymerization tank through a first conveying tube; a polylactic acid pre-polymerization mixing device is arranged on the first conveying tube; the bottom of the primary polymerization tank is communicated with the top of the final polymerization tank through a second conveying tube; the bottom of the final polymerization tank is communicated with a third conveying tube; a third metering pump and a fixed-static integrated pipeline mixing device are arranged on the third conveying tube; a spinning metering pump and a spinning component are arranged in the spinning box body. By adopting the direct spinning system, melt inside a pre-polymerization tube flows downwards in a constant speed state, the temperature of the melt inside the pre-polymerization tube is also generally uniform, only a plurality groups of mixing units are arranged on the third conveying tube directly, a mixing system mounted on the conveying tube is eliminated, the cost is reduced, the purpose of uniformly mixing materials can be achieved, and the conveying and mixing efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid polymerization, and in particular relates to a direct spinning system of polylactic acid matte fiber. Background technique [0002] The polylactic acid polymerization process includes prepolymerization and final polymerization. The melt that needs to be polymerized must first undergo pre-polymerization. The pre-polymerization equipment is a vertical cylinder-shaped tank, and the top of the tank is provided with a pre-polymerization pipe along the vertical direction. The melt that needs to be pre-polymerized enters the pre-polymerization tube quantitatively from the upper end of the pre-polymerization tube, and flows down into the tank smoothly from top to bottom by its own gravity. Due to the friction factor between the melt and the wall of the pre-polymerization tube, the downward flow velocity of the melt at the center of the pre-polymerization tube is faster than that at the wall of th...

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Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the present invention provides a method that can keep the melt at the inner wall and the center of the pre-polymerization tube flowing downward at a substantially constant speed, and can keep the melt at the inner wall and the center of the pre-polymerization tube flowing downward. Exchange mixing to keep the temperature consistent and uniformly mixed in the conveying process after final polymerization, the direct spinning system of PLA matte fiber

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